fs/reiserfs/journal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Write ahead logging implementation copyright Chris Mason 2000
   4  *
   5  * The background commits make this code very interrelated, and
   6  * overly complex.  I need to rethink things a bit....The major players:
   7  *
   8  * journal_begin -- call with the number of blocks you expect to log.
   9  *                  If the current transaction is too
  10  *                  old, it will block until the current transaction is
  11  *                  finished, and then start a new one.
  12  *                  Usually, your transaction will get joined in with
  13  *                  previous ones for speed.
  14  *
  15  * journal_join  -- same as journal_begin, but won't block on the current
  16  *                  transaction regardless of age.  Don't ever call
  17  *                  this.  Ever.  There are only two places it should be
  18  *                  called from, and they are both inside this file.
  19  *
  20  * journal_mark_dirty -- adds blocks into this transaction.  clears any flags
  21  *                       that might make them get sent to disk
  22  *                       and then marks them BH_JDirty.  Puts the buffer head
  23  *                       into the current transaction hash.
  24  *
  25  * journal_end -- if the current transaction is batchable, it does nothing
  26  *                   otherwise, it could do an async/synchronous commit, or
  27  *                   a full flush of all log and real blocks in the
  28  *                   transaction.
  29  *
  30  * flush_old_commits -- if the current transaction is too old, it is ended and
  31  *                      commit blocks are sent to disk.  Forces commit blocks
  32  *                      to disk for all backgrounded commits that have been
  33  *                      around too long.
  34  *                   -- Note, if you call this as an immediate flush from
  35  *                      within kupdate, it will ignore the immediate flag
  36  */
  37
  38 #include <linux/time.h>
  39 #include <linux/semaphore.h>
  40 #include <linux/vmalloc.h>
  41 #include "reiserfs.h"
  42 #include <linux/kernel.h>
  43 #include <linux/errno.h>
  44 #include <linux/fcntl.h>
  45 #include <linux/stat.h>
  46 #include <linux/string.h>
  47 #include <linux/buffer_head.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/writeback.h>
  50 #include <linux/blkdev.h>
  51 #include <linux/backing-dev.h>
  52 #include <linux/uaccess.h>
  53 #include <linux/slab.h>
  54
  55
  56 /* gets a struct reiserfs_journal_list * from a list head */
  57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
  58                                j_list))
  59
  60 /* must be correct to keep the desc and commit structs at 4k */
  61 #define JOURNAL_TRANS_HALF 1018
  62 #define BUFNR 64                /*read ahead */
  63
  64 /* cnode stat bits.  Move these into reiserfs_fs.h */
  65
  66 /* this block was freed, and can't be written.  */
  67 #define BLOCK_FREED 2
  68 /* this block was freed during this transaction, and can't be written */
  69 #define BLOCK_FREED_HOLDER 3
  70
  71 /* used in flush_journal_list */
  72 #define BLOCK_NEEDS_FLUSH 4
  73 #define BLOCK_DIRTIED 5
  74
  75 /* journal list state bits */
  76 #define LIST_TOUCHED 1
  77 #define LIST_DIRTY   2
  78 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
  79
  80 /* flags for do_journal_end */
  81 #define FLUSH_ALL   1           /* flush commit and real blocks */
  82 #define COMMIT_NOW  2           /* end and commit this transaction */
  83 #define WAIT        4           /* wait for the log blocks to hit the disk */
  84
  85 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
  86 static int flush_journal_list(struct super_block *s,
  87                               struct reiserfs_journal_list *jl, int flushall);
  88 static int flush_commit_list(struct super_block *s,
  89                              struct reiserfs_journal_list *jl, int flushall);
  90 static int can_dirty(struct reiserfs_journal_cnode *cn);
  91 static int journal_join(struct reiserfs_transaction_handle *th,
  92                         struct super_block *sb);
  93 static void release_journal_dev(struct super_block *super,
  94                                struct reiserfs_journal *journal);
  95 static void dirty_one_transaction(struct super_block *s,
  96                                  struct reiserfs_journal_list *jl);
  97 static void flush_async_commits(struct work_struct *work);
  98 static void queue_log_writer(struct super_block *s);
  99
 100 /* values for join in do_journal_begin_r */
 101 enum {
 102         JBEGIN_REG = 0,         /* regular journal begin */
 103         /* join the running transaction if at all possible */
 104         JBEGIN_JOIN = 1,
 105         /* called from cleanup code, ignores aborted flag */
 106         JBEGIN_ABORT = 2,
 107 };
 108
 109 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
 110                               struct super_block *sb,
 111                               unsigned long nblocks, int join);
 112
 113 static void init_journal_hash(struct super_block *sb)
 114 {
 115         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 116         memset(journal->j_hash_table, 0,
 117                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
 118 }
 119
 120 /*
 121  * clears BH_Dirty and sticks the buffer on the clean list.  Called because
 122  * I can't allow refile_buffer to make schedule happen after I've freed a
 123  * block.  Look at remove_from_transaction and journal_mark_freed for
 124  * more details.
 125  */
 126 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
 127 {
 128         if (bh) {
 129                 clear_buffer_dirty(bh);
 130                 clear_buffer_journal_test(bh);
 131         }
 132         return 0;
 133 }
 134
 135 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
 136                                                          *sb)
 137 {
 138         struct reiserfs_bitmap_node *bn;
 139         static int id;
 140
 141         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
 142         if (!bn) {
 143                 return NULL;
 144         }
 145         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
 146         if (!bn->data) {
 147                 kfree(bn);
 148                 return NULL;
 149         }
 150         bn->id = id++;
 151         INIT_LIST_HEAD(&bn->list);
 152         return bn;
 153 }
 154
 155 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
 156 {
 157         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 158         struct reiserfs_bitmap_node *bn = NULL;
 159         struct list_head *entry = journal->j_bitmap_nodes.next;
 160
 161         journal->j_used_bitmap_nodes++;
 162 repeat:
 163
 164         if (entry != &journal->j_bitmap_nodes) {
 165                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
 166                 list_del(entry);
 167                 memset(bn->data, 0, sb->s_blocksize);
 168                 journal->j_free_bitmap_nodes--;
 169                 return bn;
 170         }
 171         bn = allocate_bitmap_node(sb);
 172         if (!bn) {
 173                 yield();
 174                 goto repeat;
 175         }
 176         return bn;
 177 }
 178 static inline void free_bitmap_node(struct super_block *sb,
 179                                     struct reiserfs_bitmap_node *bn)
 180 {
 181         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 182         journal->j_used_bitmap_nodes--;
 183         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
 184                 kfree(bn->data);
 185                 kfree(bn);
 186         } else {
 187                 list_add(&bn->list, &journal->j_bitmap_nodes);
 188                 journal->j_free_bitmap_nodes++;
 189         }
 190 }
 191
 192 static void allocate_bitmap_nodes(struct super_block *sb)
 193 {
 194         int i;
 195         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 196         struct reiserfs_bitmap_node *bn = NULL;
 197         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
 198                 bn = allocate_bitmap_node(sb);
 199                 if (bn) {
 200                         list_add(&bn->list, &journal->j_bitmap_nodes);
 201                         journal->j_free_bitmap_nodes++;
 202                 } else {
 203                         /* this is ok, we'll try again when more are needed */
 204                         break;
 205                 }
 206         }
 207 }
 208
 209 static int set_bit_in_list_bitmap(struct super_block *sb,
 210                                   b_blocknr_t block,
 211                                   struct reiserfs_list_bitmap *jb)
 212 {
 213         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
 214         unsigned int bit_nr = block % (sb->s_blocksize << 3);
 215
 216         if (!jb->bitmaps[bmap_nr]) {
 217                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
 218         }
 219         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
 220         return 0;
 221 }
 222
 223 static void cleanup_bitmap_list(struct super_block *sb,
 224                                 struct reiserfs_list_bitmap *jb)
 225 {
 226         int i;
 227         if (jb->bitmaps == NULL)
 228                 return;
 229
 230         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
 231                 if (jb->bitmaps[i]) {
 232                         free_bitmap_node(sb, jb->bitmaps[i]);
 233                         jb->bitmaps[i] = NULL;
 234                 }
 235         }
 236 }
 237
 238 /*
 239  * only call this on FS unmount.
 240  */
 241 static int free_list_bitmaps(struct super_block *sb,
 242                              struct reiserfs_list_bitmap *jb_array)
 243 {
 244         int i;
 245         struct reiserfs_list_bitmap *jb;
 246         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 247                 jb = jb_array + i;
 248                 jb->journal_list = NULL;
 249                 cleanup_bitmap_list(sb, jb);
 250                 vfree(jb->bitmaps);
 251                 jb->bitmaps = NULL;
 252         }
 253         return 0;
 254 }
 255
 256 static int free_bitmap_nodes(struct super_block *sb)
 257 {
 258         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 259         struct list_head *next = journal->j_bitmap_nodes.next;
 260         struct reiserfs_bitmap_node *bn;
 261
 262         while (next != &journal->j_bitmap_nodes) {
 263                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
 264                 list_del(next);
 265                 kfree(bn->data);
 266                 kfree(bn);
 267                 next = journal->j_bitmap_nodes.next;
 268                 journal->j_free_bitmap_nodes--;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
 276  * jb_array is the array to be filled in.
 277  */
 278 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
 279                                    struct reiserfs_list_bitmap *jb_array,
 280                                    unsigned int bmap_nr)
 281 {
 282         int i;
 283         int failed = 0;
 284         struct reiserfs_list_bitmap *jb;
 285         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
 286
 287         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 288                 jb = jb_array + i;
 289                 jb->journal_list = NULL;
 290                 jb->bitmaps = vzalloc(mem);
 291                 if (!jb->bitmaps) {
 292                         reiserfs_warning(sb, "clm-2000", "unable to "
 293                                          "allocate bitmaps for journal lists");
 294                         failed = 1;
 295                         break;
 296                 }
 297         }
 298         if (failed) {
 299                 free_list_bitmaps(sb, jb_array);
 300                 return -1;
 301         }
 302         return 0;
 303 }
 304
 305 /*
 306  * find an available list bitmap.  If you can't find one, flush a commit list
 307  * and try again
 308  */
 309 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
 310                                                     struct reiserfs_journal_list
 311                                                     *jl)
 312 {
 313         int i, j;
 314         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 315         struct reiserfs_list_bitmap *jb = NULL;
 316
 317         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
 318                 i = journal->j_list_bitmap_index;
 319                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
 320                 jb = journal->j_list_bitmap + i;
 321                 if (journal->j_list_bitmap[i].journal_list) {
 322                         flush_commit_list(sb,
 323                                           journal->j_list_bitmap[i].
 324                                           journal_list, 1);
 325                         if (!journal->j_list_bitmap[i].journal_list) {
 326                                 break;
 327                         }
 328                 } else {
 329                         break;
 330                 }
 331         }
 332         /* double check to make sure if flushed correctly */
 333         if (jb->journal_list)
 334                 return NULL;
 335         jb->journal_list = jl;
 336         return jb;
 337 }
 338
 339 /*
 340  * allocates a new chunk of X nodes, and links them all together as a list.
 341  * Uses the cnode->next and cnode->prev pointers
 342  * returns NULL on failure
 343  */
 344 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
 345 {
 346         struct reiserfs_journal_cnode *head;
 347         int i;
 348         if (num_cnodes <= 0) {
 349                 return NULL;
 350         }
 351         head = vzalloc(array_size(num_cnodes,
 352                                   sizeof(struct reiserfs_journal_cnode)));
 353         if (!head) {
 354                 return NULL;
 355         }
 356         head[0].prev = NULL;
 357         head[0].next = head + 1;
 358         for (i = 1; i < num_cnodes; i++) {
 359                 head[i].prev = head + (i - 1);
 360                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
 361         }
 362         head[num_cnodes - 1].next = NULL;
 363         return head;
 364 }
 365
 366 /* pulls a cnode off the free list, or returns NULL on failure */
 367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
 368 {
 369         struct reiserfs_journal_cnode *cn;
 370         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 371
 372         reiserfs_check_lock_depth(sb, "get_cnode");
 373
 374         if (journal->j_cnode_free <= 0) {
 375                 return NULL;
 376         }
 377         journal->j_cnode_used++;
 378         journal->j_cnode_free--;
 379         cn = journal->j_cnode_free_list;
 380         if (!cn) {
 381                 return cn;
 382         }
 383         if (cn->next) {
 384                 cn->next->prev = NULL;
 385         }
 386         journal->j_cnode_free_list = cn->next;
 387         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
 388         return cn;
 389 }
 390
 391 /*
 392  * returns a cnode to the free list
 393  */
 394 static void free_cnode(struct super_block *sb,
 395                        struct reiserfs_journal_cnode *cn)
 396 {
 397         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 398
 399         reiserfs_check_lock_depth(sb, "free_cnode");
 400
 401         journal->j_cnode_used--;
 402         journal->j_cnode_free++;
 403         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
 404         cn->next = journal->j_cnode_free_list;
 405         if (journal->j_cnode_free_list) {
 406                 journal->j_cnode_free_list->prev = cn;
 407         }
 408         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
 409         journal->j_cnode_free_list = cn;
 410 }
 411
 412 static void clear_prepared_bits(struct buffer_head *bh)
 413 {
 414         clear_buffer_journal_prepared(bh);
 415         clear_buffer_journal_restore_dirty(bh);
 416 }
 417
 418 /*
 419  * return a cnode with same dev, block number and size in table,
 420  * or null if not found
 421  */
 422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
 423                                                                   super_block
 424                                                                   *sb,
 425                                                                   struct
 426                                                                   reiserfs_journal_cnode
 427                                                                   **table,
 428                                                                   long bl)
 429 {
 430         struct reiserfs_journal_cnode *cn;
 431         cn = journal_hash(table, sb, bl);
 432         while (cn) {
 433                 if (cn->blocknr == bl && cn->sb == sb)
 434                         return cn;
 435                 cn = cn->hnext;
 436         }
 437         return (struct reiserfs_journal_cnode *)0;
 438 }
 439
 440 /*
 441  * this actually means 'can this block be reallocated yet?'.  If you set
 442  * search_all, a block can only be allocated if it is not in the current
 443  * transaction, was not freed by the current transaction, and has no chance
 444  * of ever being overwritten by a replay after crashing.
 445  *
 446  * If you don't set search_all, a block can only be allocated if it is not
 447  * in the current transaction.  Since deleting a block removes it from the
 448  * current transaction, this case should never happen.  If you don't set
 449  * search_all, make sure you never write the block without logging it.
 450  *
 451  * next_zero_bit is a suggestion about the next block to try for find_forward.
 452  * when bl is rejected because it is set in a journal list bitmap, we search
 453  * for the next zero bit in the bitmap that rejected bl.  Then, we return
 454  * that through next_zero_bit for find_forward to try.
 455  *
 456  * Just because we return something in next_zero_bit does not mean we won't
 457  * reject it on the next call to reiserfs_in_journal
 458  */
 459 int reiserfs_in_journal(struct super_block *sb,
 460                         unsigned int bmap_nr, int bit_nr, int search_all,
 461                         b_blocknr_t * next_zero_bit)
 462 {
 463         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 464         struct reiserfs_journal_cnode *cn;
 465         struct reiserfs_list_bitmap *jb;
 466         int i;
 467         unsigned long bl;
 468
 469         *next_zero_bit = 0;     /* always start this at zero. */
 470
 471         PROC_INFO_INC(sb, journal.in_journal);
 472         /*
 473          * If we aren't doing a search_all, this is a metablock, and it
 474          * will be logged before use.  if we crash before the transaction
 475          * that freed it commits,  this transaction won't have committed
 476          * either, and the block will never be written
 477          */
 478         if (search_all) {
 479                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 480                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
 481                         jb = journal->j_list_bitmap + i;
 482                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
 483                             test_bit(bit_nr,
 484                                      (unsigned long *)jb->bitmaps[bmap_nr]->
 485                                      data)) {
 486                                 *next_zero_bit =
 487                                     find_next_zero_bit((unsigned long *)
 488                                                        (jb->bitmaps[bmap_nr]->
 489                                                         data),
 490                                                        sb->s_blocksize << 3,
 491                                                        bit_nr + 1);
 492                                 return 1;
 493                         }
 494                 }
 495         }
 496
 497         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
 498         /* is it in any old transactions? */
 499         if (search_all
 500             && (cn =
 501                 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
 502                 return 1;
 503         }
 504
 505         /* is it in the current transaction.  This should never happen */
 506         if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
 507                 BUG();
 508                 return 1;
 509         }
 510
 511         PROC_INFO_INC(sb, journal.in_journal_reusable);
 512         /* safe for reuse */
 513         return 0;
 514 }
 515
 516 /* insert cn into table */
 517 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 518                                        struct reiserfs_journal_cnode *cn)
 519 {
 520         struct reiserfs_journal_cnode *cn_orig;
 521
 522         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
 523         cn->hnext = cn_orig;
 524         cn->hprev = NULL;
 525         if (cn_orig) {
 526                 cn_orig->hprev = cn;
 527         }
 528         journal_hash(table, cn->sb, cn->blocknr) = cn;
 529 }
 530
 531 /* lock the current transaction */
 532 static inline void lock_journal(struct super_block *sb)
 533 {
 534         PROC_INFO_INC(sb, journal.lock_journal);
 535
 536         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 537 }
 538
 539 /* unlock the current transaction */
 540 static inline void unlock_journal(struct super_block *sb)
 541 {
 542         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
 543 }
 544
 545 static inline void get_journal_list(struct reiserfs_journal_list *jl)
 546 {
 547         jl->j_refcount++;
 548 }
 549
 550 static inline void put_journal_list(struct super_block *s,
 551                                     struct reiserfs_journal_list *jl)
 552 {
 553         if (jl->j_refcount < 1) {
 554                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
 555                                jl->j_trans_id, jl->j_refcount);
 556         }
 557         if (--jl->j_refcount == 0)
 558                 kfree(jl);
 559 }
 560
 561 /*
 562  * this used to be much more involved, and I'm keeping it just in case
 563  * things get ugly again.  it gets called by flush_commit_list, and
 564  * cleans up any data stored about blocks freed during a transaction.
 565  */
 566 static void cleanup_freed_for_journal_list(struct super_block *sb,
 567                                            struct reiserfs_journal_list *jl)
 568 {
 569
 570         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
 571         if (jb) {
 572                 cleanup_bitmap_list(sb, jb);
 573         }
 574         jl->j_list_bitmap->journal_list = NULL;
 575         jl->j_list_bitmap = NULL;
 576 }
 577
 578 static int journal_list_still_alive(struct super_block *s,
 579                                     unsigned int trans_id)
 580 {
 581         struct reiserfs_journal *journal = SB_JOURNAL(s);
 582         struct list_head *entry = &journal->j_journal_list;
 583         struct reiserfs_journal_list *jl;
 584
 585         if (!list_empty(entry)) {
 586                 jl = JOURNAL_LIST_ENTRY(entry->next);
 587                 if (jl->j_trans_id <= trans_id) {
 588                         return 1;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 /*
 595  * If page->mapping was null, we failed to truncate this page for
 596  * some reason.  Most likely because it was truncated after being
 597  * logged via data=journal.
 598  *
 599  * This does a check to see if the buffer belongs to one of these
 600  * lost pages before doing the final put_bh.  If page->mapping was
 601  * null, it tries to free buffers on the page, which should make the
 602  * final put_page drop the page from the lru.
 603  */
 604 static void release_buffer_page(struct buffer_head *bh)
 605 {
 606         struct page *page = bh->b_page;
 607         if (!page->mapping && trylock_page(page)) {
 608                 get_page(page);
 609                 put_bh(bh);
 610                 if (!page->mapping)
 611                         try_to_free_buffers(page);
 612                 unlock_page(page);
 613                 put_page(page);
 614         } else {
 615                 put_bh(bh);
 616         }
 617 }
 618
 619 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 620 {
 621         if (buffer_journaled(bh)) {
 622                 reiserfs_warning(NULL, "clm-2084",
 623                                  "pinned buffer %lu:%pg sent to disk",
 624                                  bh->b_blocknr, bh->b_bdev);
 625         }
 626         if (uptodate)
 627                 set_buffer_uptodate(bh);
 628         else
 629                 clear_buffer_uptodate(bh);
 630
 631         unlock_buffer(bh);
 632         release_buffer_page(bh);
 633 }
 634
 635 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
 636 {
 637         if (uptodate)
 638                 set_buffer_uptodate(bh);
 639         else
 640                 clear_buffer_uptodate(bh);
 641         unlock_buffer(bh);
 642         put_bh(bh);
 643 }
 644
 645 static void submit_logged_buffer(struct buffer_head *bh)
 646 {
 647         get_bh(bh);
 648         bh->b_end_io = reiserfs_end_buffer_io_sync;
 649         clear_buffer_journal_new(bh);
 650         clear_buffer_dirty(bh);
 651         if (!test_clear_buffer_journal_test(bh))
 652                 BUG();
 653         if (!buffer_uptodate(bh))
 654                 BUG();
 655         submit_bh(REQ_OP_WRITE, 0, bh);
 656 }
 657
 658 static void submit_ordered_buffer(struct buffer_head *bh)
 659 {
 660         get_bh(bh);
 661         bh->b_end_io = reiserfs_end_ordered_io;
 662         clear_buffer_dirty(bh);
 663         if (!buffer_uptodate(bh))
 664                 BUG();
 665         submit_bh(REQ_OP_WRITE, 0, bh);
 666 }
 667
 668 #define CHUNK_SIZE 32
 669 struct buffer_chunk {
 670         struct buffer_head *bh[CHUNK_SIZE];
 671         int nr;
 672 };
 673
 674 static void write_chunk(struct buffer_chunk *chunk)
 675 {
 676         int i;
 677         for (i = 0; i < chunk->nr; i++) {
 678                 submit_logged_buffer(chunk->bh[i]);
 679         }
 680         chunk->nr = 0;
 681 }
 682
 683 static void write_ordered_chunk(struct buffer_chunk *chunk)
 684 {
 685         int i;
 686         for (i = 0; i < chunk->nr; i++) {
 687                 submit_ordered_buffer(chunk->bh[i]);
 688         }
 689         chunk->nr = 0;
 690 }
 691
 692 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
 693                         spinlock_t * lock, void (fn) (struct buffer_chunk *))
 694 {
 695         int ret = 0;
 696         BUG_ON(chunk->nr >= CHUNK_SIZE);
 697         chunk->bh[chunk->nr++] = bh;
 698         if (chunk->nr >= CHUNK_SIZE) {
 699                 ret = 1;
 700                 if (lock) {
 701                         spin_unlock(lock);
 702                         fn(chunk);
 703                         spin_lock(lock);
 704                 } else {
 705                         fn(chunk);
 706                 }
 707         }
 708         return ret;
 709 }
 710
 711 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
 712 static struct reiserfs_jh *alloc_jh(void)
 713 {
 714         struct reiserfs_jh *jh;
 715         while (1) {
 716                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
 717                 if (jh) {
 718                         atomic_inc(&nr_reiserfs_jh);
 719                         return jh;
 720                 }
 721                 yield();
 722         }
 723 }
 724
 725 /*
 726  * we want to free the jh when the buffer has been written
 727  * and waited on
 728  */
 729 void reiserfs_free_jh(struct buffer_head *bh)
 730 {
 731         struct reiserfs_jh *jh;
 732
 733         jh = bh->b_private;
 734         if (jh) {
 735                 bh->b_private = NULL;
 736                 jh->bh = NULL;
 737                 list_del_init(&jh->list);
 738                 kfree(jh);
 739                 if (atomic_read(&nr_reiserfs_jh) <= 0)
 740                         BUG();
 741                 atomic_dec(&nr_reiserfs_jh);
 742                 put_bh(bh);
 743         }
 744 }
 745
 746 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
 747                            int tail)
 748 {
 749         struct reiserfs_jh *jh;
 750
 751         if (bh->b_private) {
 752                 spin_lock(&j->j_dirty_buffers_lock);
 753                 if (!bh->b_private) {
 754                         spin_unlock(&j->j_dirty_buffers_lock);
 755                         goto no_jh;
 756                 }
 757                 jh = bh->b_private;
 758                 list_del_init(&jh->list);
 759         } else {
 760 no_jh:
 761                 get_bh(bh);
 762                 jh = alloc_jh();
 763                 spin_lock(&j->j_dirty_buffers_lock);
 764                 /*
 765                  * buffer must be locked for __add_jh, should be able to have
 766                  * two adds at the same time
 767                  */
 768                 BUG_ON(bh->b_private);
 769                 jh->bh = bh;
 770                 bh->b_private = jh;
 771         }
 772         jh->jl = j->j_current_jl;
 773         if (tail)
 774                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
 775         else {
 776                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
 777         }
 778         spin_unlock(&j->j_dirty_buffers_lock);
 779         return 0;
 780 }
 781
 782 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
 783 {
 784         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
 785 }
 786 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
 787 {
 788         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
 789 }
 790
 791 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
 792 static int write_ordered_buffers(spinlock_t * lock,
 793                                  struct reiserfs_journal *j,
 794                                  struct reiserfs_journal_list *jl,
 795                                  struct list_head *list)
 796 {
 797         struct buffer_head *bh;
 798         struct reiserfs_jh *jh;
 799         int ret = j->j_errno;
 800         struct buffer_chunk chunk;
 801         struct list_head tmp;
 802         INIT_LIST_HEAD(&tmp);
 803
 804         chunk.nr = 0;
 805         spin_lock(lock);
 806         while (!list_empty(list)) {
 807                 jh = JH_ENTRY(list->next);
 808                 bh = jh->bh;
 809                 get_bh(bh);
 810                 if (!trylock_buffer(bh)) {
 811                         if (!buffer_dirty(bh)) {
 812                                 list_move(&jh->list, &tmp);
 813                                 goto loop_next;
 814                         }
 815                         spin_unlock(lock);
 816                         if (chunk.nr)
 817                                 write_ordered_chunk(&chunk);
 818                         wait_on_buffer(bh);
 819                         cond_resched();
 820                         spin_lock(lock);
 821                         goto loop_next;
 822                 }
 823                 /*
 824                  * in theory, dirty non-uptodate buffers should never get here,
 825                  * but the upper layer io error paths still have a few quirks.
 826                  * Handle them here as gracefully as we can
 827                  */
 828                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
 829                         clear_buffer_dirty(bh);
 830                         ret = -EIO;
 831                 }
 832                 if (buffer_dirty(bh)) {
 833                         list_move(&jh->list, &tmp);
 834                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
 835                 } else {
 836                         reiserfs_free_jh(bh);
 837                         unlock_buffer(bh);
 838                 }
 839 loop_next:
 840                 put_bh(bh);
 841                 cond_resched_lock(lock);
 842         }
 843         if (chunk.nr) {
 844                 spin_unlock(lock);
 845                 write_ordered_chunk(&chunk);
 846                 spin_lock(lock);
 847         }
 848         while (!list_empty(&tmp)) {
 849                 jh = JH_ENTRY(tmp.prev);
 850                 bh = jh->bh;
 851                 get_bh(bh);
 852                 reiserfs_free_jh(bh);
 853
 854                 if (buffer_locked(bh)) {
 855                         spin_unlock(lock);
 856                         wait_on_buffer(bh);
 857                         spin_lock(lock);
 858                 }
 859                 if (!buffer_uptodate(bh)) {
 860                         ret = -EIO;
 861                 }
 862                 /*
 863                  * ugly interaction with invalidatepage here.
 864                  * reiserfs_invalidate_page will pin any buffer that has a
 865                  * valid journal head from an older transaction.  If someone
 866                  * else sets our buffer dirty after we write it in the first
 867                  * loop, and then someone truncates the page away, nobody
 868                  * will ever write the buffer. We're safe if we write the
 869                  * page one last time after freeing the journal header.
 870                  */
 871                 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
 872                         spin_unlock(lock);
 873                         ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 874                         spin_lock(lock);
 875                 }
 876                 put_bh(bh);
 877                 cond_resched_lock(lock);
 878         }
 879         spin_unlock(lock);
 880         return ret;
 881 }
 882
 883 static int flush_older_commits(struct super_block *s,
 884                                struct reiserfs_journal_list *jl)
 885 {
 886         struct reiserfs_journal *journal = SB_JOURNAL(s);
 887         struct reiserfs_journal_list *other_jl;
 888         struct reiserfs_journal_list *first_jl;
 889         struct list_head *entry;
 890         unsigned int trans_id = jl->j_trans_id;
 891         unsigned int other_trans_id;
 892
 893 find_first:
 894         /*
 895          * first we walk backwards to find the oldest uncommitted transation
 896          */
 897         first_jl = jl;
 898         entry = jl->j_list.prev;
 899         while (1) {
 900                 other_jl = JOURNAL_LIST_ENTRY(entry);
 901                 if (entry == &journal->j_journal_list ||
 902                     atomic_read(&other_jl->j_older_commits_done))
 903                         break;
 904
 905                 first_jl = other_jl;
 906                 entry = other_jl->j_list.prev;
 907         }
 908
 909         /* if we didn't find any older uncommitted transactions, return now */
 910         if (first_jl == jl) {
 911                 return 0;
 912         }
 913
 914         entry = &first_jl->j_list;
 915         while (1) {
 916                 other_jl = JOURNAL_LIST_ENTRY(entry);
 917                 other_trans_id = other_jl->j_trans_id;
 918
 919                 if (other_trans_id < trans_id) {
 920                         if (atomic_read(&other_jl->j_commit_left) != 0) {
 921                                 flush_commit_list(s, other_jl, 0);
 922
 923                                 /* list we were called with is gone, return */
 924                                 if (!journal_list_still_alive(s, trans_id))
 925                                         return 1;
 926
 927                                 /*
 928                                  * the one we just flushed is gone, this means
 929                                  * all older lists are also gone, so first_jl
 930                                  * is no longer valid either.  Go back to the
 931                                  * beginning.
 932                                  */
 933                                 if (!journal_list_still_alive
 934                                     (s, other_trans_id)) {
 935                                         goto find_first;
 936                                 }
 937                         }
 938                         entry = entry->next;
 939                         if (entry == &journal->j_journal_list)
 940                                 return 0;
 941                 } else {
 942                         return 0;
 943                 }
 944         }
 945         return 0;
 946 }
 947
 948 static int reiserfs_async_progress_wait(struct super_block *s)
 949 {
 950         struct reiserfs_journal *j = SB_JOURNAL(s);
 951
 952         if (atomic_read(&j->j_async_throttle)) {
 953                 int depth;
 954
 955                 depth = reiserfs_write_unlock_nested(s);
 956                 congestion_wait(BLK_RW_ASYNC, HZ / 10);
 957                 reiserfs_write_lock_nested(s, depth);
 958         }
 959
 960         return 0;
 961 }
 962
 963 /*
 964  * if this journal list still has commit blocks unflushed, send them to disk.
 965  *
 966  * log areas must be flushed in order (transaction 2 can't commit before
 967  * transaction 1) Before the commit block can by written, every other log
 968  * block must be safely on disk
 969  */
 970 static int flush_commit_list(struct super_block *s,
 971                              struct reiserfs_journal_list *jl, int flushall)
 972 {
 973         int i;
 974         b_blocknr_t bn;
 975         struct buffer_head *tbh = NULL;
 976         unsigned int trans_id = jl->j_trans_id;
 977         struct reiserfs_journal *journal = SB_JOURNAL(s);
 978         int retval = 0;
 979         int write_len;
 980         int depth;
 981
 982         reiserfs_check_lock_depth(s, "flush_commit_list");
 983
 984         if (atomic_read(&jl->j_older_commits_done)) {
 985                 return 0;
 986         }
 987
 988         /*
 989          * before we can put our commit blocks on disk, we have to make
 990          * sure everyone older than us is on disk too
 991          */
 992         BUG_ON(jl->j_len <= 0);
 993         BUG_ON(trans_id == journal->j_trans_id);
 994
 995         get_journal_list(jl);
 996         if (flushall) {
 997                 if (flush_older_commits(s, jl) == 1) {
 998                         /*
 999                          * list disappeared during flush_older_commits.
1000                          * return
1001                          */
1002                         goto put_jl;
1003                 }
1004         }
1005
1006         /* make sure nobody is trying to flush this one at the same time */
1007         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1008
1009         if (!journal_list_still_alive(s, trans_id)) {
1010                 mutex_unlock(&jl->j_commit_mutex);
1011                 goto put_jl;
1012         }
1013         BUG_ON(jl->j_trans_id == 0);
1014
1015         /* this commit is done, exit */
1016         if (atomic_read(&jl->j_commit_left) <= 0) {
1017                 if (flushall) {
1018                         atomic_set(&jl->j_older_commits_done, 1);
1019                 }
1020                 mutex_unlock(&jl->j_commit_mutex);
1021                 goto put_jl;
1022         }
1023
1024         if (!list_empty(&jl->j_bh_list)) {
1025                 int ret;
1026
1027                 /*
1028                  * We might sleep in numerous places inside
1029                  * write_ordered_buffers. Relax the write lock.
1030                  */
1031                 depth = reiserfs_write_unlock_nested(s);
1032                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1033                                             journal, jl, &jl->j_bh_list);
1034                 if (ret < 0 && retval == 0)
1035                         retval = ret;
1036                 reiserfs_write_lock_nested(s, depth);
1037         }
1038         BUG_ON(!list_empty(&jl->j_bh_list));
1039         /*
1040          * for the description block and all the log blocks, submit any buffers
1041          * that haven't already reached the disk.  Try to write at least 256
1042          * log blocks. later on, we will only wait on blocks that correspond
1043          * to this transaction, but while we're unplugging we might as well
1044          * get a chunk of data on there.
1045          */
1046         atomic_inc(&journal->j_async_throttle);
1047         write_len = jl->j_len + 1;
1048         if (write_len < 256)
1049                 write_len = 256;
1050         for (i = 0 ; i < write_len ; i++) {
1051                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1052                     SB_ONDISK_JOURNAL_SIZE(s);
1053                 tbh = journal_find_get_block(s, bn);
1054                 if (tbh) {
1055                         if (buffer_dirty(tbh)) {
1056                             depth = reiserfs_write_unlock_nested(s);
1057                             ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1058                             reiserfs_write_lock_nested(s, depth);
1059                         }
1060                         put_bh(tbh) ;
1061                 }
1062         }
1063         atomic_dec(&journal->j_async_throttle);
1064
1065         for (i = 0; i < (jl->j_len + 1); i++) {
1066                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1067                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1068                 tbh = journal_find_get_block(s, bn);
1069
1070                 depth = reiserfs_write_unlock_nested(s);
1071                 __wait_on_buffer(tbh);
1072                 reiserfs_write_lock_nested(s, depth);
1073                 /*
1074                  * since we're using ll_rw_blk above, it might have skipped
1075                  * over a locked buffer.  Double check here
1076                  */
1077                 /* redundant, sync_dirty_buffer() checks */
1078                 if (buffer_dirty(tbh)) {
1079                         depth = reiserfs_write_unlock_nested(s);
1080                         sync_dirty_buffer(tbh);
1081                         reiserfs_write_lock_nested(s, depth);
1082                 }
1083                 if (unlikely(!buffer_uptodate(tbh))) {
1084 #ifdef CONFIG_REISERFS_CHECK
1085                         reiserfs_warning(s, "journal-601",
1086                                          "buffer write failed");
1087 #endif
1088                         retval = -EIO;
1089                 }
1090                 /* once for journal_find_get_block */
1091                 put_bh(tbh);
1092                 /* once due to original getblk in do_journal_end */
1093                 put_bh(tbh);
1094                 atomic_dec(&jl->j_commit_left);
1095         }
1096
1097         BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1098
1099         /*
1100          * If there was a write error in the journal - we can't commit
1101          * this transaction - it will be invalid and, if successful,
1102          * will just end up propagating the write error out to
1103          * the file system.
1104          */
1105         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1106                 if (buffer_dirty(jl->j_commit_bh))
1107                         BUG();
1108                 mark_buffer_dirty(jl->j_commit_bh) ;
1109                 depth = reiserfs_write_unlock_nested(s);
1110                 if (reiserfs_barrier_flush(s))
1111                         __sync_dirty_buffer(jl->j_commit_bh,
1112                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1113                 else
1114                         sync_dirty_buffer(jl->j_commit_bh);
1115                 reiserfs_write_lock_nested(s, depth);
1116         }
1117
1118         /*
1119          * If there was a write error in the journal - we can't commit this
1120          * transaction - it will be invalid and, if successful, will just end
1121          * up propagating the write error out to the filesystem.
1122          */
1123         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1124 #ifdef CONFIG_REISERFS_CHECK
1125                 reiserfs_warning(s, "journal-615", "buffer write failed");
1126 #endif
1127                 retval = -EIO;
1128         }
1129         bforget(jl->j_commit_bh);
1130         if (journal->j_last_commit_id != 0 &&
1131             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1132                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1133                                  journal->j_last_commit_id, jl->j_trans_id);
1134         }
1135         journal->j_last_commit_id = jl->j_trans_id;
1136
1137         /*
1138          * now, every commit block is on the disk.  It is safe to allow
1139          * blocks freed during this transaction to be reallocated
1140          */
1141         cleanup_freed_for_journal_list(s, jl);
1142
1143         retval = retval ? retval : journal->j_errno;
1144
1145         /* mark the metadata dirty */
1146         if (!retval)
1147                 dirty_one_transaction(s, jl);
1148         atomic_dec(&jl->j_commit_left);
1149
1150         if (flushall) {
1151                 atomic_set(&jl->j_older_commits_done, 1);
1152         }
1153         mutex_unlock(&jl->j_commit_mutex);
1154 put_jl:
1155         put_journal_list(s, jl);
1156
1157         if (retval)
1158                 reiserfs_abort(s, retval, "Journal write error in %s",
1159                                __func__);
1160         return retval;
1161 }
1162
1163 /*
1164  * flush_journal_list frequently needs to find a newer transaction for a
1165  * given block.  This does that, or returns NULL if it can't find anything
1166  */
1167 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1168                                                           reiserfs_journal_cnode
1169                                                           *cn)
1170 {
1171         struct super_block *sb = cn->sb;
1172         b_blocknr_t blocknr = cn->blocknr;
1173
1174         cn = cn->hprev;
1175         while (cn) {
1176                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1177                         return cn->jlist;
1178                 }
1179                 cn = cn->hprev;
1180         }
1181         return NULL;
1182 }
1183
1184 static void remove_journal_hash(struct super_block *,
1185                                 struct reiserfs_journal_cnode **,
1186                                 struct reiserfs_journal_list *, unsigned long,
1187                                 int);
1188
1189 /*
1190  * once all the real blocks have been flushed, it is safe to remove them
1191  * from the journal list for this transaction.  Aside from freeing the
1192  * cnode, this also allows the block to be reallocated for data blocks
1193  * if it had been deleted.
1194  */
1195 static void remove_all_from_journal_list(struct super_block *sb,
1196                                          struct reiserfs_journal_list *jl,
1197                                          int debug)
1198 {
1199         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1200         struct reiserfs_journal_cnode *cn, *last;
1201         cn = jl->j_realblock;
1202
1203         /*
1204          * which is better, to lock once around the whole loop, or
1205          * to lock for each call to remove_journal_hash?
1206          */
1207         while (cn) {
1208                 if (cn->blocknr != 0) {
1209                         if (debug) {
1210                                 reiserfs_warning(sb, "reiserfs-2201",
1211                                                  "block %u, bh is %d, state %ld",
1212                                                  cn->blocknr, cn->bh ? 1 : 0,
1213                                                  cn->state);
1214                         }
1215                         cn->state = 0;
1216                         remove_journal_hash(sb, journal->j_list_hash_table,
1217                                             jl, cn->blocknr, 1);
1218                 }
1219                 last = cn;
1220                 cn = cn->next;
1221                 free_cnode(sb, last);
1222         }
1223         jl->j_realblock = NULL;
1224 }
1225
1226 /*
1227  * if this timestamp is greater than the timestamp we wrote last to the
1228  * header block, write it to the header block.  once this is done, I can
1229  * safely say the log area for this transaction won't ever be replayed,
1230  * and I can start releasing blocks in this transaction for reuse as data
1231  * blocks.  called by flush_journal_list, before it calls
1232  * remove_all_from_journal_list
1233  */
1234 static int _update_journal_header_block(struct super_block *sb,
1235                                         unsigned long offset,
1236                                         unsigned int trans_id)
1237 {
1238         struct reiserfs_journal_header *jh;
1239         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1240         int depth;
1241
1242         if (reiserfs_is_journal_aborted(journal))
1243                 return -EIO;
1244
1245         if (trans_id >= journal->j_last_flush_trans_id) {
1246                 if (buffer_locked((journal->j_header_bh))) {
1247                         depth = reiserfs_write_unlock_nested(sb);
1248                         __wait_on_buffer(journal->j_header_bh);
1249                         reiserfs_write_lock_nested(sb, depth);
1250                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1251 #ifdef CONFIG_REISERFS_CHECK
1252                                 reiserfs_warning(sb, "journal-699",
1253                                                  "buffer write failed");
1254 #endif
1255                                 return -EIO;
1256                         }
1257                 }
1258                 journal->j_last_flush_trans_id = trans_id;
1259                 journal->j_first_unflushed_offset = offset;
1260                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1261                                                         b_data);
1262                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1263                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1264                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1265
1266                 set_buffer_dirty(journal->j_header_bh);
1267                 depth = reiserfs_write_unlock_nested(sb);
1268
1269                 if (reiserfs_barrier_flush(sb))
1270                         __sync_dirty_buffer(journal->j_header_bh,
1271                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1272                 else
1273                         sync_dirty_buffer(journal->j_header_bh);
1274
1275                 reiserfs_write_lock_nested(sb, depth);
1276                 if (!buffer_uptodate(journal->j_header_bh)) {
1277                         reiserfs_warning(sb, "journal-837",
1278                                          "IO error during journal replay");
1279                         return -EIO;
1280                 }
1281         }
1282         return 0;
1283 }
1284
1285 static int update_journal_header_block(struct super_block *sb,
1286                                        unsigned long offset,
1287                                        unsigned int trans_id)
1288 {
1289         return _update_journal_header_block(sb, offset, trans_id);
1290 }
1291
1292 /*
1293 ** flush any and all journal lists older than you are
1294 ** can only be called from flush_journal_list
1295 */
1296 static int flush_older_journal_lists(struct super_block *sb,
1297                                      struct reiserfs_journal_list *jl)
1298 {
1299         struct list_head *entry;
1300         struct reiserfs_journal_list *other_jl;
1301         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1302         unsigned int trans_id = jl->j_trans_id;
1303
1304         /*
1305          * we know we are the only ones flushing things, no extra race
1306          * protection is required.
1307          */
1308 restart:
1309         entry = journal->j_journal_list.next;
1310         /* Did we wrap? */
1311         if (entry == &journal->j_journal_list)
1312                 return 0;
1313         other_jl = JOURNAL_LIST_ENTRY(entry);
1314         if (other_jl->j_trans_id < trans_id) {
1315                 BUG_ON(other_jl->j_refcount <= 0);
1316                 /* do not flush all */
1317                 flush_journal_list(sb, other_jl, 0);
1318
1319                 /* other_jl is now deleted from the list */
1320                 goto restart;
1321         }
1322         return 0;
1323 }
1324
1325 static void del_from_work_list(struct super_block *s,
1326                                struct reiserfs_journal_list *jl)
1327 {
1328         struct reiserfs_journal *journal = SB_JOURNAL(s);
1329         if (!list_empty(&jl->j_working_list)) {
1330                 list_del_init(&jl->j_working_list);
1331                 journal->j_num_work_lists--;
1332         }
1333 }
1334
1335 /*
1336  * flush a journal list, both commit and real blocks
1337  *
1338  * always set flushall to 1, unless you are calling from inside
1339  * flush_journal_list
1340  *
1341  * IMPORTANT.  This can only be called while there are no journal writers,
1342  * and the journal is locked.  That means it can only be called from
1343  * do_journal_end, or by journal_release
1344  */
1345 static int flush_journal_list(struct super_block *s,
1346                               struct reiserfs_journal_list *jl, int flushall)
1347 {
1348         struct reiserfs_journal_list *pjl;
1349         struct reiserfs_journal_cnode *cn;
1350         int count;
1351         int was_jwait = 0;
1352         int was_dirty = 0;
1353         struct buffer_head *saved_bh;
1354         unsigned long j_len_saved = jl->j_len;
1355         struct reiserfs_journal *journal = SB_JOURNAL(s);
1356         int err = 0;
1357         int depth;
1358
1359         BUG_ON(j_len_saved <= 0);
1360
1361         if (atomic_read(&journal->j_wcount) != 0) {
1362                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1363                                  atomic_read(&journal->j_wcount));
1364         }
1365
1366         /* if flushall == 0, the lock is already held */
1367         if (flushall) {
1368                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1369         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1370                 BUG();
1371         }
1372
1373         count = 0;
1374         if (j_len_saved > journal->j_trans_max) {
1375                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1376                                j_len_saved, jl->j_trans_id);
1377                 return 0;
1378         }
1379
1380         /* if all the work is already done, get out of here */
1381         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1382             atomic_read(&jl->j_commit_left) <= 0) {
1383                 goto flush_older_and_return;
1384         }
1385
1386         /*
1387          * start by putting the commit list on disk.  This will also flush
1388          * the commit lists of any olders transactions
1389          */
1390         flush_commit_list(s, jl, 1);
1391
1392         if (!(jl->j_state & LIST_DIRTY)
1393             && !reiserfs_is_journal_aborted(journal))
1394                 BUG();
1395
1396         /* are we done now? */
1397         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1398             atomic_read(&jl->j_commit_left) <= 0) {
1399                 goto flush_older_and_return;
1400         }
1401
1402         /*
1403          * loop through each cnode, see if we need to write it,
1404          * or wait on a more recent transaction, or just ignore it
1405          */
1406         if (atomic_read(&journal->j_wcount) != 0) {
1407                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1408                                "wcount is not 0");
1409         }
1410         cn = jl->j_realblock;
1411         while (cn) {
1412                 was_jwait = 0;
1413                 was_dirty = 0;
1414                 saved_bh = NULL;
1415                 /* blocknr of 0 is no longer in the hash, ignore it */
1416                 if (cn->blocknr == 0) {
1417                         goto free_cnode;
1418                 }
1419
1420                 /*
1421                  * This transaction failed commit.
1422                  * Don't write out to the disk
1423                  */
1424                 if (!(jl->j_state & LIST_DIRTY))
1425                         goto free_cnode;
1426
1427                 pjl = find_newer_jl_for_cn(cn);
1428                 /*
1429                  * the order is important here.  We check pjl to make sure we
1430                  * don't clear BH_JDirty_wait if we aren't the one writing this
1431                  * block to disk
1432                  */
1433                 if (!pjl && cn->bh) {
1434                         saved_bh = cn->bh;
1435
1436                         /*
1437                          * we do this to make sure nobody releases the
1438                          * buffer while we are working with it
1439                          */
1440                         get_bh(saved_bh);
1441
1442                         if (buffer_journal_dirty(saved_bh)) {
1443                                 BUG_ON(!can_dirty(cn));
1444                                 was_jwait = 1;
1445                                 was_dirty = 1;
1446                         } else if (can_dirty(cn)) {
1447                                 /*
1448                                  * everything with !pjl && jwait
1449                                  * should be writable
1450                                  */
1451                                 BUG();
1452                         }
1453                 }
1454
1455                 /*
1456                  * if someone has this block in a newer transaction, just make
1457                  * sure they are committed, and don't try writing it to disk
1458                  */
1459                 if (pjl) {
1460                         if (atomic_read(&pjl->j_commit_left))
1461                                 flush_commit_list(s, pjl, 1);
1462                         goto free_cnode;
1463                 }
1464
1465                 /*
1466                  * bh == NULL when the block got to disk on its own, OR,
1467                  * the block got freed in a future transaction
1468                  */
1469                 if (saved_bh == NULL) {
1470                         goto free_cnode;
1471                 }
1472
1473                 /*
1474                  * this should never happen.  kupdate_one_transaction has
1475                  * this list locked while it works, so we should never see a
1476                  * buffer here that is not marked JDirty_wait
1477                  */
1478                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1479                         reiserfs_warning(s, "journal-813",
1480                                          "BAD! buffer %llu %cdirty %cjwait, "
1481                                          "not in a newer transaction",
1482                                          (unsigned long long)saved_bh->
1483                                          b_blocknr, was_dirty ? ' ' : '!',
1484                                          was_jwait ? ' ' : '!');
1485                 }
1486                 if (was_dirty) {
1487                         /*
1488                          * we inc again because saved_bh gets decremented
1489                          * at free_cnode
1490                          */
1491                         get_bh(saved_bh);
1492                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1493                         lock_buffer(saved_bh);
1494                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1495                         if (buffer_dirty(saved_bh))
1496                                 submit_logged_buffer(saved_bh);
1497                         else
1498                                 unlock_buffer(saved_bh);
1499                         count++;
1500                 } else {
1501                         reiserfs_warning(s, "clm-2082",
1502                                          "Unable to flush buffer %llu in %s",
1503                                          (unsigned long long)saved_bh->
1504                                          b_blocknr, __func__);
1505                 }
1506 free_cnode:
1507                 cn = cn->next;
1508                 if (saved_bh) {
1509                         /*
1510                          * we incremented this to keep others from
1511                          * taking the buffer head away
1512                          */
1513                         put_bh(saved_bh);
1514                         if (atomic_read(&saved_bh->b_count) < 0) {
1515                                 reiserfs_warning(s, "journal-945",
1516                                                  "saved_bh->b_count < 0");
1517                         }
1518                 }
1519         }
1520         if (count > 0) {
1521                 cn = jl->j_realblock;
1522                 while (cn) {
1523                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1524                                 if (!cn->bh) {
1525                                         reiserfs_panic(s, "journal-1011",
1526                                                        "cn->bh is NULL");
1527                                 }
1528
1529                                 depth = reiserfs_write_unlock_nested(s);
1530                                 __wait_on_buffer(cn->bh);
1531                                 reiserfs_write_lock_nested(s, depth);
1532
1533                                 if (!cn->bh) {
1534                                         reiserfs_panic(s, "journal-1012",
1535                                                        "cn->bh is NULL");
1536                                 }
1537                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1538 #ifdef CONFIG_REISERFS_CHECK
1539                                         reiserfs_warning(s, "journal-949",
1540                                                          "buffer write failed");
1541 #endif
1542                                         err = -EIO;
1543                                 }
1544                                 /*
1545                                  * note, we must clear the JDirty_wait bit
1546                                  * after the up to date check, otherwise we
1547                                  * race against our flushpage routine
1548                                  */
1549                                 BUG_ON(!test_clear_buffer_journal_dirty
1550                                        (cn->bh));
1551
1552                                 /* drop one ref for us */
1553                                 put_bh(cn->bh);
1554                                 /* drop one ref for journal_mark_dirty */
1555                                 release_buffer_page(cn->bh);
1556                         }
1557                         cn = cn->next;
1558                 }
1559         }
1560
1561         if (err)
1562                 reiserfs_abort(s, -EIO,
1563                                "Write error while pushing transaction to disk in %s",
1564                                __func__);
1565 flush_older_and_return:
1566
1567         /*
1568          * before we can update the journal header block, we _must_ flush all
1569          * real blocks from all older transactions to disk.  This is because
1570          * once the header block is updated, this transaction will not be
1571          * replayed after a crash
1572          */
1573         if (flushall) {
1574                 flush_older_journal_lists(s, jl);
1575         }
1576
1577         err = journal->j_errno;
1578         /*
1579          * before we can remove everything from the hash tables for this
1580          * transaction, we must make sure it can never be replayed
1581          *
1582          * since we are only called from do_journal_end, we know for sure there
1583          * are no allocations going on while we are flushing journal lists.  So,
1584          * we only need to update the journal header block for the last list
1585          * being flushed
1586          */
1587         if (!err && flushall) {
1588                 err =
1589                     update_journal_header_block(s,
1590                                                 (jl->j_start + jl->j_len +
1591                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1592                                                 jl->j_trans_id);
1593                 if (err)
1594                         reiserfs_abort(s, -EIO,
1595                                        "Write error while updating journal header in %s",
1596                                        __func__);
1597         }
1598         remove_all_from_journal_list(s, jl, 0);
1599         list_del_init(&jl->j_list);
1600         journal->j_num_lists--;
1601         del_from_work_list(s, jl);
1602
1603         if (journal->j_last_flush_id != 0 &&
1604             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1605                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1606                                  journal->j_last_flush_id, jl->j_trans_id);
1607         }
1608         journal->j_last_flush_id = jl->j_trans_id;
1609
1610         /*
1611          * not strictly required since we are freeing the list, but it should
1612          * help find code using dead lists later on
1613          */
1614         jl->j_len = 0;
1615         atomic_set(&jl->j_nonzerolen, 0);
1616         jl->j_start = 0;
1617         jl->j_realblock = NULL;
1618         jl->j_commit_bh = NULL;
1619         jl->j_trans_id = 0;
1620         jl->j_state = 0;
1621         put_journal_list(s, jl);
1622         if (flushall)
1623                 mutex_unlock(&journal->j_flush_mutex);
1624         return err;
1625 }
1626
1627 static int write_one_transaction(struct super_block *s,
1628                                  struct reiserfs_journal_list *jl,
1629                                  struct buffer_chunk *chunk)
1630 {
1631         struct reiserfs_journal_cnode *cn;
1632         int ret = 0;
1633
1634         jl->j_state |= LIST_TOUCHED;
1635         del_from_work_list(s, jl);
1636         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1637                 return 0;
1638         }
1639
1640         cn = jl->j_realblock;
1641         while (cn) {
1642                 /*
1643                  * if the blocknr == 0, this has been cleared from the hash,
1644                  * skip it
1645                  */
1646                 if (cn->blocknr == 0) {
1647                         goto next;
1648                 }
1649                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1650                         struct buffer_head *tmp_bh;
1651                         /*
1652                          * we can race against journal_mark_freed when we try
1653                          * to lock_buffer(cn->bh), so we have to inc the buffer
1654                          * count, and recheck things after locking
1655                          */
1656                         tmp_bh = cn->bh;
1657                         get_bh(tmp_bh);
1658                         lock_buffer(tmp_bh);
1659                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1660                                 if (!buffer_journal_dirty(tmp_bh) ||
1661                                     buffer_journal_prepared(tmp_bh))
1662                                         BUG();
1663                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1664                                 ret++;
1665                         } else {
1666                                 /* note, cn->bh might be null now */
1667                                 unlock_buffer(tmp_bh);
1668                         }
1669                         put_bh(tmp_bh);
1670                 }
1671 next:
1672                 cn = cn->next;
1673                 cond_resched();
1674         }
1675         return ret;
1676 }
1677
1678 /* used by flush_commit_list */
1679 static void dirty_one_transaction(struct super_block *s,
1680                                  struct reiserfs_journal_list *jl)
1681 {
1682         struct reiserfs_journal_cnode *cn;
1683         struct reiserfs_journal_list *pjl;
1684
1685         jl->j_state |= LIST_DIRTY;
1686         cn = jl->j_realblock;
1687         while (cn) {
1688                 /*
1689                  * look for a more recent transaction that logged this
1690                  * buffer.  Only the most recent transaction with a buffer in
1691                  * it is allowed to send that buffer to disk
1692                  */
1693                 pjl = find_newer_jl_for_cn(cn);
1694                 if (!pjl && cn->blocknr && cn->bh
1695                     && buffer_journal_dirty(cn->bh)) {
1696                         BUG_ON(!can_dirty(cn));
1697                         /*
1698                          * if the buffer is prepared, it will either be logged
1699                          * or restored.  If restored, we need to make sure
1700                          * it actually gets marked dirty
1701                          */
1702                         clear_buffer_journal_new(cn->bh);
1703                         if (buffer_journal_prepared(cn->bh)) {
1704                                 set_buffer_journal_restore_dirty(cn->bh);
1705                         } else {
1706                                 set_buffer_journal_test(cn->bh);
1707                                 mark_buffer_dirty(cn->bh);
1708                         }
1709                 }
1710                 cn = cn->next;
1711         }
1712 }
1713
1714 static int kupdate_transactions(struct super_block *s,
1715                                 struct reiserfs_journal_list *jl,
1716                                 struct reiserfs_journal_list **next_jl,
1717                                 unsigned int *next_trans_id,
1718                                 int num_blocks, int num_trans)
1719 {
1720         int ret = 0;
1721         int written = 0;
1722         int transactions_flushed = 0;
1723         unsigned int orig_trans_id = jl->j_trans_id;
1724         struct buffer_chunk chunk;
1725         struct list_head *entry;
1726         struct reiserfs_journal *journal = SB_JOURNAL(s);
1727         chunk.nr = 0;
1728
1729         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1730         if (!journal_list_still_alive(s, orig_trans_id)) {
1731                 goto done;
1732         }
1733
1734         /*
1735          * we've got j_flush_mutex held, nobody is going to delete any
1736          * of these lists out from underneath us
1737          */
1738         while ((num_trans && transactions_flushed < num_trans) ||
1739                (!num_trans && written < num_blocks)) {
1740
1741                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1742                     atomic_read(&jl->j_commit_left)
1743                     || !(jl->j_state & LIST_DIRTY)) {
1744                         del_from_work_list(s, jl);
1745                         break;
1746                 }
1747                 ret = write_one_transaction(s, jl, &chunk);
1748
1749                 if (ret < 0)
1750                         goto done;
1751                 transactions_flushed++;
1752                 written += ret;
1753                 entry = jl->j_list.next;
1754
1755                 /* did we wrap? */
1756                 if (entry == &journal->j_journal_list) {
1757                         break;
1758                 }
1759                 jl = JOURNAL_LIST_ENTRY(entry);
1760
1761                 /* don't bother with older transactions */
1762                 if (jl->j_trans_id <= orig_trans_id)
1763                         break;
1764         }
1765         if (chunk.nr) {
1766                 write_chunk(&chunk);
1767         }
1768
1769 done:
1770         mutex_unlock(&journal->j_flush_mutex);
1771         return ret;
1772 }
1773
1774 /*
1775  * for o_sync and fsync heavy applications, they tend to use
1776  * all the journa list slots with tiny transactions.  These
1777  * trigger lots and lots of calls to update the header block, which
1778  * adds seeks and slows things down.
1779  *
1780  * This function tries to clear out a large chunk of the journal lists
1781  * at once, which makes everything faster since only the newest journal
1782  * list updates the header block
1783  */
1784 static int flush_used_journal_lists(struct super_block *s,
1785                                     struct reiserfs_journal_list *jl)
1786 {
1787         unsigned long len = 0;
1788         unsigned long cur_len;
1789         int i;
1790         int limit = 256;
1791         struct reiserfs_journal_list *tjl;
1792         struct reiserfs_journal_list *flush_jl;
1793         unsigned int trans_id;
1794         struct reiserfs_journal *journal = SB_JOURNAL(s);
1795
1796         flush_jl = tjl = jl;
1797
1798         /* in data logging mode, try harder to flush a lot of blocks */
1799         if (reiserfs_data_log(s))
1800                 limit = 1024;
1801         /* flush for 256 transactions or limit blocks, whichever comes first */
1802         for (i = 0; i < 256 && len < limit; i++) {
1803                 if (atomic_read(&tjl->j_commit_left) ||
1804                     tjl->j_trans_id < jl->j_trans_id) {
1805                         break;
1806                 }
1807                 cur_len = atomic_read(&tjl->j_nonzerolen);
1808                 if (cur_len > 0) {
1809                         tjl->j_state &= ~LIST_TOUCHED;
1810                 }
1811                 len += cur_len;
1812                 flush_jl = tjl;
1813                 if (tjl->j_list.next == &journal->j_journal_list)
1814                         break;
1815                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1816         }
1817         get_journal_list(jl);
1818         get_journal_list(flush_jl);
1819
1820         /*
1821          * try to find a group of blocks we can flush across all the
1822          * transactions, but only bother if we've actually spanned
1823          * across multiple lists
1824          */
1825         if (flush_jl != jl)
1826                 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1827
1828         flush_journal_list(s, flush_jl, 1);
1829         put_journal_list(s, flush_jl);
1830         put_journal_list(s, jl);
1831         return 0;
1832 }
1833
1834 /*
1835  * removes any nodes in table with name block and dev as bh.
1836  * only touchs the hnext and hprev pointers.
1837  */
1838 static void remove_journal_hash(struct super_block *sb,
1839                          struct reiserfs_journal_cnode **table,
1840                          struct reiserfs_journal_list *jl,
1841                          unsigned long block, int remove_freed)
1842 {
1843         struct reiserfs_journal_cnode *cur;
1844         struct reiserfs_journal_cnode **head;
1845
1846         head = &(journal_hash(table, sb, block));
1847         if (!head) {
1848                 return;
1849         }
1850         cur = *head;
1851         while (cur) {
1852                 if (cur->blocknr == block && cur->sb == sb
1853                     && (jl == NULL || jl == cur->jlist)
1854                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1855                         if (cur->hnext) {
1856                                 cur->hnext->hprev = cur->hprev;
1857                         }
1858                         if (cur->hprev) {
1859                                 cur->hprev->hnext = cur->hnext;
1860                         } else {
1861                                 *head = cur->hnext;
1862                         }
1863                         cur->blocknr = 0;
1864                         cur->sb = NULL;
1865                         cur->state = 0;
1866                         /*
1867                          * anybody who clears the cur->bh will also
1868                          * dec the nonzerolen
1869                          */
1870                         if (cur->bh && cur->jlist)
1871                                 atomic_dec(&cur->jlist->j_nonzerolen);
1872                         cur->bh = NULL;
1873                         cur->jlist = NULL;
1874                 }
1875                 cur = cur->hnext;
1876         }
1877 }
1878
1879 static void free_journal_ram(struct super_block *sb)
1880 {
1881         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1882         kfree(journal->j_current_jl);
1883         journal->j_num_lists--;
1884
1885         vfree(journal->j_cnode_free_orig);
1886         free_list_bitmaps(sb, journal->j_list_bitmap);
1887         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1888         if (journal->j_header_bh) {
1889                 brelse(journal->j_header_bh);
1890         }
1891         /*
1892          * j_header_bh is on the journal dev, make sure
1893          * not to release the journal dev until we brelse j_header_bh
1894          */
1895         release_journal_dev(sb, journal);
1896         vfree(journal);
1897 }
1898
1899 /*
1900  * call on unmount.  Only set error to 1 if you haven't made your way out
1901  * of read_super() yet.  Any other caller must keep error at 0.
1902  */
1903 static int do_journal_release(struct reiserfs_transaction_handle *th,
1904                               struct super_block *sb, int error)
1905 {
1906         struct reiserfs_transaction_handle myth;
1907         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1908
1909         /*
1910          * we only want to flush out transactions if we were
1911          * called with error == 0
1912          */
1913         if (!error && !sb_rdonly(sb)) {
1914                 /* end the current trans */
1915                 BUG_ON(!th->t_trans_id);
1916                 do_journal_end(th, FLUSH_ALL);
1917
1918                 /*
1919                  * make sure something gets logged to force
1920                  * our way into the flush code
1921                  */
1922                 if (!journal_join(&myth, sb)) {
1923                         reiserfs_prepare_for_journal(sb,
1924                                                      SB_BUFFER_WITH_SB(sb),
1925                                                      1);
1926                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1927                         do_journal_end(&myth, FLUSH_ALL);
1928                 }
1929         }
1930
1931         /* this also catches errors during the do_journal_end above */
1932         if (!error && reiserfs_is_journal_aborted(journal)) {
1933                 memset(&myth, 0, sizeof(myth));
1934                 if (!journal_join_abort(&myth, sb)) {
1935                         reiserfs_prepare_for_journal(sb,
1936                                                      SB_BUFFER_WITH_SB(sb),
1937                                                      1);
1938                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1939                         do_journal_end(&myth, FLUSH_ALL);
1940                 }
1941         }
1942
1943
1944         /*
1945          * We must release the write lock here because
1946          * the workqueue job (flush_async_commit) needs this lock
1947          */
1948         reiserfs_write_unlock(sb);
1949
1950         /*
1951          * Cancel flushing of old commits. Note that neither of these works
1952          * will be requeued because superblock is being shutdown and doesn't
1953          * have SB_ACTIVE set.
1954          */
1955         reiserfs_cancel_old_flush(sb);
1956         /* wait for all commits to finish */
1957         cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1958
1959         free_journal_ram(sb);
1960
1961         reiserfs_write_lock(sb);
1962
1963         return 0;
1964 }
1965
1966 /* * call on unmount.  flush all journal trans, release all alloc'd ram */
1967 int journal_release(struct reiserfs_transaction_handle *th,
1968                     struct super_block *sb)
1969 {
1970         return do_journal_release(th, sb, 0);
1971 }
1972
1973 /* only call from an error condition inside reiserfs_read_super!  */
1974 int journal_release_error(struct reiserfs_transaction_handle *th,
1975                           struct super_block *sb)
1976 {
1977         return do_journal_release(th, sb, 1);
1978 }
1979
1980 /*
1981  * compares description block with commit block.
1982  * returns 1 if they differ, 0 if they are the same
1983  */
1984 static int journal_compare_desc_commit(struct super_block *sb,
1985                                        struct reiserfs_journal_desc *desc,
1986                                        struct reiserfs_journal_commit *commit)
1987 {
1988         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1989             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1990             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1991             get_commit_trans_len(commit) <= 0) {
1992                 return 1;
1993         }
1994         return 0;
1995 }
1996
1997 /*
1998  * returns 0 if it did not find a description block
1999  * returns -1 if it found a corrupt commit block
2000  * returns 1 if both desc and commit were valid
2001  * NOTE: only called during fs mount
2002  */
2003 static int journal_transaction_is_valid(struct super_block *sb,
2004                                         struct buffer_head *d_bh,
2005                                         unsigned int *oldest_invalid_trans_id,
2006                                         unsigned long *newest_mount_id)
2007 {
2008         struct reiserfs_journal_desc *desc;
2009         struct reiserfs_journal_commit *commit;
2010         struct buffer_head *c_bh;
2011         unsigned long offset;
2012
2013         if (!d_bh)
2014                 return 0;
2015
2016         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2017         if (get_desc_trans_len(desc) > 0
2018             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2019                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2020                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2021                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2022                                        "journal-986: transaction "
2023                                        "is valid returning because trans_id %d is greater than "
2024                                        "oldest_invalid %lu",
2025                                        get_desc_trans_id(desc),
2026                                        *oldest_invalid_trans_id);
2027                         return 0;
2028                 }
2029                 if (newest_mount_id
2030                     && *newest_mount_id > get_desc_mount_id(desc)) {
2031                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2032                                        "journal-1087: transaction "
2033                                        "is valid returning because mount_id %d is less than "
2034                                        "newest_mount_id %lu",
2035                                        get_desc_mount_id(desc),
2036                                        *newest_mount_id);
2037                         return -1;
2038                 }
2039                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2040                         reiserfs_warning(sb, "journal-2018",
2041                                          "Bad transaction length %d "
2042                                          "encountered, ignoring transaction",
2043                                          get_desc_trans_len(desc));
2044                         return -1;
2045                 }
2046                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2047
2048                 /*
2049                  * ok, we have a journal description block,
2050                  * let's see if the transaction was valid
2051                  */
2052                 c_bh =
2053                     journal_bread(sb,
2054                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2055                                   ((offset + get_desc_trans_len(desc) +
2056                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2057                 if (!c_bh)
2058                         return 0;
2059                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2060                 if (journal_compare_desc_commit(sb, desc, commit)) {
2061                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2062                                        "journal_transaction_is_valid, commit offset %ld had bad "
2063                                        "time %d or length %d",
2064                                        c_bh->b_blocknr -
2065                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2066                                        get_commit_trans_id(commit),
2067                                        get_commit_trans_len(commit));
2068                         brelse(c_bh);
2069                         if (oldest_invalid_trans_id) {
2070                                 *oldest_invalid_trans_id =
2071                                     get_desc_trans_id(desc);
2072                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2073                                                "journal-1004: "
2074                                                "transaction_is_valid setting oldest invalid trans_id "
2075                                                "to %d",
2076                                                get_desc_trans_id(desc));
2077                         }
2078                         return -1;
2079                 }
2080                 brelse(c_bh);
2081                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2082                                "journal-1006: found valid "
2083                                "transaction start offset %llu, len %d id %d",
2084                                d_bh->b_blocknr -
2085                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2086                                get_desc_trans_len(desc),
2087                                get_desc_trans_id(desc));
2088                 return 1;
2089         } else {
2090                 return 0;
2091         }
2092 }
2093
2094 static void brelse_array(struct buffer_head **heads, int num)
2095 {
2096         int i;
2097         for (i = 0; i < num; i++) {
2098                 brelse(heads[i]);
2099         }
2100 }
2101
2102 /*
2103  * given the start, and values for the oldest acceptable transactions,
2104  * this either reads in a replays a transaction, or returns because the
2105  * transaction is invalid, or too old.
2106  * NOTE: only called during fs mount
2107  */
2108 static int journal_read_transaction(struct super_block *sb,
2109                                     unsigned long cur_dblock,
2110                                     unsigned long oldest_start,
2111                                     unsigned int oldest_trans_id,
2112                                     unsigned long newest_mount_id)
2113 {
2114         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2115         struct reiserfs_journal_desc *desc;
2116         struct reiserfs_journal_commit *commit;
2117         unsigned int trans_id = 0;
2118         struct buffer_head *c_bh;
2119         struct buffer_head *d_bh;
2120         struct buffer_head **log_blocks = NULL;
2121         struct buffer_head **real_blocks = NULL;
2122         unsigned int trans_offset;
2123         int i;
2124         int trans_half;
2125
2126         d_bh = journal_bread(sb, cur_dblock);
2127         if (!d_bh)
2128                 return 1;
2129         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2130         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2131         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2132                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2133                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2134                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2135         if (get_desc_trans_id(desc) < oldest_trans_id) {
2136                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2137                                "journal_read_trans skipping because %lu is too old",
2138                                cur_dblock -
2139                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2140                 brelse(d_bh);
2141                 return 1;
2142         }
2143         if (get_desc_mount_id(desc) != newest_mount_id) {
2144                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2145                                "journal_read_trans skipping because %d is != "
2146                                "newest_mount_id %lu", get_desc_mount_id(desc),
2147                                newest_mount_id);
2148                 brelse(d_bh);
2149                 return 1;
2150         }
2151         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2152                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2153                               SB_ONDISK_JOURNAL_SIZE(sb)));
2154         if (!c_bh) {
2155                 brelse(d_bh);
2156                 return 1;
2157         }
2158         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2159         if (journal_compare_desc_commit(sb, desc, commit)) {
2160                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2161                                "journal_read_transaction, "
2162                                "commit offset %llu had bad time %d or length %d",
2163                                c_bh->b_blocknr -
2164                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2165                                get_commit_trans_id(commit),
2166                                get_commit_trans_len(commit));
2167                 brelse(c_bh);
2168                 brelse(d_bh);
2169                 return 1;
2170         }
2171
2172         if (bdev_read_only(sb->s_bdev)) {
2173                 reiserfs_warning(sb, "clm-2076",
2174                                  "device is readonly, unable to replay log");
2175                 brelse(c_bh);
2176                 brelse(d_bh);
2177                 return -EROFS;
2178         }
2179
2180         trans_id = get_desc_trans_id(desc);
2181         /*
2182          * now we know we've got a good transaction, and it was
2183          * inside the valid time ranges
2184          */
2185         log_blocks = kmalloc_array(get_desc_trans_len(desc),
2186                                    sizeof(struct buffer_head *),
2187                                    GFP_NOFS);
2188         real_blocks = kmalloc_array(get_desc_trans_len(desc),
2189                                     sizeof(struct buffer_head *),
2190                                     GFP_NOFS);
2191         if (!log_blocks || !real_blocks) {
2192                 brelse(c_bh);
2193                 brelse(d_bh);
2194                 kfree(log_blocks);
2195                 kfree(real_blocks);
2196                 reiserfs_warning(sb, "journal-1169",
2197                                  "kmalloc failed, unable to mount FS");
2198                 return -1;
2199         }
2200         /* get all the buffer heads */
2201         trans_half = journal_trans_half(sb->s_blocksize);
2202         for (i = 0; i < get_desc_trans_len(desc); i++) {
2203                 log_blocks[i] =
2204                     journal_getblk(sb,
2205                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2206                                    (trans_offset + 1 +
2207                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2208                 if (i < trans_half) {
2209                         real_blocks[i] =
2210                             sb_getblk(sb,
2211                                       le32_to_cpu(desc->j_realblock[i]));
2212                 } else {
2213                         real_blocks[i] =
2214                             sb_getblk(sb,
2215                                       le32_to_cpu(commit->
2216                                                   j_realblock[i - trans_half]));
2217                 }
2218                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2219                         reiserfs_warning(sb, "journal-1207",
2220                                          "REPLAY FAILURE fsck required! "
2221                                          "Block to replay is outside of "
2222                                          "filesystem");
2223                         goto abort_replay;
2224                 }
2225                 /* make sure we don't try to replay onto log or reserved area */
2226                 if (is_block_in_log_or_reserved_area
2227                     (sb, real_blocks[i]->b_blocknr)) {
2228                         reiserfs_warning(sb, "journal-1204",
2229                                          "REPLAY FAILURE fsck required! "
2230                                          "Trying to replay onto a log block");
2231 abort_replay:
2232                         brelse_array(log_blocks, i);
2233                         brelse_array(real_blocks, i);
2234                         brelse(c_bh);
2235                         brelse(d_bh);
2236                         kfree(log_blocks);
2237                         kfree(real_blocks);
2238                         return -1;
2239                 }
2240         }
2241         /* read in the log blocks, memcpy to the corresponding real block */
2242         ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2243         for (i = 0; i < get_desc_trans_len(desc); i++) {
2244
2245                 wait_on_buffer(log_blocks[i]);
2246                 if (!buffer_uptodate(log_blocks[i])) {
2247                         reiserfs_warning(sb, "journal-1212",
2248                                          "REPLAY FAILURE fsck required! "
2249                                          "buffer write failed");
2250                         brelse_array(log_blocks + i,
2251                                      get_desc_trans_len(desc) - i);
2252                         brelse_array(real_blocks, get_desc_trans_len(desc));
2253                         brelse(c_bh);
2254                         brelse(d_bh);
2255                         kfree(log_blocks);
2256                         kfree(real_blocks);
2257                         return -1;
2258                 }
2259                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2260                        real_blocks[i]->b_size);
2261                 set_buffer_uptodate(real_blocks[i]);
2262                 brelse(log_blocks[i]);
2263         }
2264         /* flush out the real blocks */
2265         for (i = 0; i < get_desc_trans_len(desc); i++) {
2266                 set_buffer_dirty(real_blocks[i]);
2267                 write_dirty_buffer(real_blocks[i], 0);
2268         }
2269         for (i = 0; i < get_desc_trans_len(desc); i++) {
2270                 wait_on_buffer(real_blocks[i]);
2271                 if (!buffer_uptodate(real_blocks[i])) {
2272                         reiserfs_warning(sb, "journal-1226",
2273                                          "REPLAY FAILURE, fsck required! "
2274                                          "buffer write failed");
2275                         brelse_array(real_blocks + i,
2276                                      get_desc_trans_len(desc) - i);
2277                         brelse(c_bh);
2278                         brelse(d_bh);
2279                         kfree(log_blocks);
2280                         kfree(real_blocks);
2281                         return -1;
2282                 }
2283                 brelse(real_blocks[i]);
2284         }
2285         cur_dblock =
2286             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2287             ((trans_offset + get_desc_trans_len(desc) +
2288               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2289         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2290                        "journal-1095: setting journal " "start to offset %ld",
2291                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2292
2293         /*
2294          * init starting values for the first transaction, in case
2295          * this is the last transaction to be replayed.
2296          */
2297         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2298         journal->j_last_flush_trans_id = trans_id;
2299         journal->j_trans_id = trans_id + 1;
2300         /* check for trans_id overflow */
2301         if (journal->j_trans_id == 0)
2302                 journal->j_trans_id = 10;
2303         brelse(c_bh);
2304         brelse(d_bh);
2305         kfree(log_blocks);
2306         kfree(real_blocks);
2307         return 0;
2308 }
2309
2310 /*
2311  * This function reads blocks starting from block and to max_block of bufsize
2312  * size (but no more than BUFNR blocks at a time). This proved to improve
2313  * mounting speed on self-rebuilding raid5 arrays at least.
2314  * Right now it is only used from journal code. But later we might use it
2315  * from other places.
2316  * Note: Do not use journal_getblk/sb_getblk functions here!
2317  */
2318 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2319                                            b_blocknr_t block, int bufsize,
2320                                            b_blocknr_t max_block)
2321 {
2322         struct buffer_head *bhlist[BUFNR];
2323         unsigned int blocks = BUFNR;
2324         struct buffer_head *bh;
2325         int i, j;
2326
2327         bh = __getblk(dev, block, bufsize);
2328         if (buffer_uptodate(bh))
2329                 return (bh);
2330
2331         if (block + BUFNR > max_block) {
2332                 blocks = max_block - block;
2333         }
2334         bhlist[0] = bh;
2335         j = 1;
2336         for (i = 1; i < blocks; i++) {
2337                 bh = __getblk(dev, block + i, bufsize);
2338                 if (buffer_uptodate(bh)) {
2339                         brelse(bh);
2340                         break;
2341                 } else
2342                         bhlist[j++] = bh;
2343         }
2344         ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2345         for (i = 1; i < j; i++)
2346                 brelse(bhlist[i]);
2347         bh = bhlist[0];
2348         wait_on_buffer(bh);
2349         if (buffer_uptodate(bh))
2350                 return bh;
2351         brelse(bh);
2352         return NULL;
2353 }
2354
2355 /*
2356  * read and replay the log
2357  * on a clean unmount, the journal header's next unflushed pointer will be
2358  * to an invalid transaction.  This tests that before finding all the
2359  * transactions in the log, which makes normal mount times fast.
2360  *
2361  * After a crash, this starts with the next unflushed transaction, and
2362  * replays until it finds one too old, or invalid.
2363  *
2364  * On exit, it sets things up so the first transaction will work correctly.
2365  * NOTE: only called during fs mount
2366  */
2367 static int journal_read(struct super_block *sb)
2368 {
2369         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2370         struct reiserfs_journal_desc *desc;
2371         unsigned int oldest_trans_id = 0;
2372         unsigned int oldest_invalid_trans_id = 0;
2373         time64_t start;
2374         unsigned long oldest_start = 0;
2375         unsigned long cur_dblock = 0;
2376         unsigned long newest_mount_id = 9;
2377         struct buffer_head *d_bh;
2378         struct reiserfs_journal_header *jh;
2379         int valid_journal_header = 0;
2380         int replay_count = 0;
2381         int continue_replay = 1;
2382         int ret;
2383
2384         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2385         reiserfs_info(sb, "checking transaction log (%pg)\n",
2386                       journal->j_dev_bd);
2387         start = ktime_get_seconds();
2388
2389         /*
2390          * step 1, read in the journal header block.  Check the transaction
2391          * it says is the first unflushed, and if that transaction is not
2392          * valid, replay is done
2393          */
2394         journal->j_header_bh = journal_bread(sb,
2395                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2396                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2397         if (!journal->j_header_bh) {
2398                 return 1;
2399         }
2400         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2401         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2402             SB_ONDISK_JOURNAL_SIZE(sb)
2403             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2404                 oldest_start =
2405                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2406                     le32_to_cpu(jh->j_first_unflushed_offset);
2407                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2408                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2409                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2410                                "journal-1153: found in "
2411                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2412                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2413                                le32_to_cpu(jh->j_last_flush_trans_id));
2414                 valid_journal_header = 1;
2415
2416                 /*
2417                  * now, we try to read the first unflushed offset.  If it
2418                  * is not valid, there is nothing more we can do, and it
2419                  * makes no sense to read through the whole log.
2420                  */
2421                 d_bh =
2422                     journal_bread(sb,
2423                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2424                                   le32_to_cpu(jh->j_first_unflushed_offset));
2425                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2426                 if (!ret) {
2427                         continue_replay = 0;
2428                 }
2429                 brelse(d_bh);
2430                 goto start_log_replay;
2431         }
2432
2433         /*
2434          * ok, there are transactions that need to be replayed.  start
2435          * with the first log block, find all the valid transactions, and
2436          * pick out the oldest.
2437          */
2438         while (continue_replay
2439                && cur_dblock <
2440                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2441                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2442                 /*
2443                  * Note that it is required for blocksize of primary fs
2444                  * device and journal device to be the same
2445                  */
2446                 d_bh =
2447                     reiserfs_breada(journal->j_dev_bd, cur_dblock,
2448                                     sb->s_blocksize,
2449                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2450                                     SB_ONDISK_JOURNAL_SIZE(sb));
2451                 ret =
2452                     journal_transaction_is_valid(sb, d_bh,
2453                                                  &oldest_invalid_trans_id,
2454                                                  &newest_mount_id);
2455                 if (ret == 1) {
2456                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2457                         if (oldest_start == 0) {        /* init all oldest_ values */
2458                                 oldest_trans_id = get_desc_trans_id(desc);
2459                                 oldest_start = d_bh->b_blocknr;
2460                                 newest_mount_id = get_desc_mount_id(desc);
2461                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2462                                                "journal-1179: Setting "
2463                                                "oldest_start to offset %llu, trans_id %lu",
2464                                                oldest_start -
2465                                                SB_ONDISK_JOURNAL_1st_BLOCK
2466                                                (sb), oldest_trans_id);
2467                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2468                                 /* one we just read was older */
2469                                 oldest_trans_id = get_desc_trans_id(desc);
2470                                 oldest_start = d_bh->b_blocknr;
2471                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2472                                                "journal-1180: Resetting "
2473                                                "oldest_start to offset %lu, trans_id %lu",
2474                                                oldest_start -
2475                                                SB_ONDISK_JOURNAL_1st_BLOCK
2476                                                (sb), oldest_trans_id);
2477                         }
2478                         if (newest_mount_id < get_desc_mount_id(desc)) {
2479                                 newest_mount_id = get_desc_mount_id(desc);
2480                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2481                                                "journal-1299: Setting "
2482                                                "newest_mount_id to %d",
2483                                                get_desc_mount_id(desc));
2484                         }
2485                         cur_dblock += get_desc_trans_len(desc) + 2;
2486                 } else {
2487                         cur_dblock++;
2488                 }
2489                 brelse(d_bh);
2490         }
2491
2492 start_log_replay:
2493         cur_dblock = oldest_start;
2494         if (oldest_trans_id) {
2495                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2496                                "journal-1206: Starting replay "
2497                                "from offset %llu, trans_id %lu",
2498                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2499                                oldest_trans_id);
2500
2501         }
2502         replay_count = 0;
2503         while (continue_replay && oldest_trans_id > 0) {
2504                 ret =
2505                     journal_read_transaction(sb, cur_dblock, oldest_start,
2506                                              oldest_trans_id, newest_mount_id);
2507                 if (ret < 0) {
2508                         return ret;
2509                 } else if (ret != 0) {
2510                         break;
2511                 }
2512                 cur_dblock =
2513                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2514                 replay_count++;
2515                 if (cur_dblock == oldest_start)
2516                         break;
2517         }
2518
2519         if (oldest_trans_id == 0) {
2520                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2521                                "journal-1225: No valid " "transactions found");
2522         }
2523         /*
2524          * j_start does not get set correctly if we don't replay any
2525          * transactions.  if we had a valid journal_header, set j_start
2526          * to the first unflushed transaction value, copy the trans_id
2527          * from the header
2528          */
2529         if (valid_journal_header && replay_count == 0) {
2530                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2531                 journal->j_trans_id =
2532                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2533                 /* check for trans_id overflow */
2534                 if (journal->j_trans_id == 0)
2535                         journal->j_trans_id = 10;
2536                 journal->j_last_flush_trans_id =
2537                     le32_to_cpu(jh->j_last_flush_trans_id);
2538                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2539         } else {
2540                 journal->j_mount_id = newest_mount_id + 1;
2541         }
2542         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2543                        "newest_mount_id to %lu", journal->j_mount_id);
2544         journal->j_first_unflushed_offset = journal->j_start;
2545         if (replay_count > 0) {
2546                 reiserfs_info(sb,
2547                               "replayed %d transactions in %lu seconds\n",
2548                               replay_count, ktime_get_seconds() - start);
2549         }
2550         /* needed to satisfy the locking in _update_journal_header_block */
2551         reiserfs_write_lock(sb);
2552         if (!bdev_read_only(sb->s_bdev) &&
2553             _update_journal_header_block(sb, journal->j_start,
2554                                          journal->j_last_flush_trans_id)) {
2555                 reiserfs_write_unlock(sb);
2556                 /*
2557                  * replay failed, caller must call free_journal_ram and abort
2558                  * the mount
2559                  */
2560                 return -1;
2561         }
2562         reiserfs_write_unlock(sb);
2563         return 0;
2564 }
2565
2566 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2567 {
2568         struct reiserfs_journal_list *jl;
2569         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2570                      GFP_NOFS | __GFP_NOFAIL);
2571         INIT_LIST_HEAD(&jl->j_list);
2572         INIT_LIST_HEAD(&jl->j_working_list);
2573         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2574         INIT_LIST_HEAD(&jl->j_bh_list);
2575         mutex_init(&jl->j_commit_mutex);
2576         SB_JOURNAL(s)->j_num_lists++;
2577         get_journal_list(jl);
2578         return jl;
2579 }
2580
2581 static void journal_list_init(struct super_block *sb)
2582 {
2583         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2584 }
2585
2586 static void release_journal_dev(struct super_block *super,
2587                                struct reiserfs_journal *journal)
2588 {
2589         if (journal->j_dev_bd != NULL) {
2590                 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2591                 journal->j_dev_bd = NULL;
2592         }
2593 }
2594
2595 static int journal_init_dev(struct super_block *super,
2596                             struct reiserfs_journal *journal,
2597                             const char *jdev_name)
2598 {
2599         int result;
2600         dev_t jdev;
2601         fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2602
2603         result = 0;
2604
2605         journal->j_dev_bd = NULL;
2606         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2607             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2608
2609         if (bdev_read_only(super->s_bdev))
2610                 blkdev_mode = FMODE_READ;
2611
2612         /* there is no "jdev" option and journal is on separate device */
2613         if ((!jdev_name || !jdev_name[0])) {
2614                 if (jdev == super->s_dev)
2615                         blkdev_mode &= ~FMODE_EXCL;
2616                 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2617                                                       journal);
2618                 journal->j_dev_mode = blkdev_mode;
2619                 if (IS_ERR(journal->j_dev_bd)) {
2620                         result = PTR_ERR(journal->j_dev_bd);
2621                         journal->j_dev_bd = NULL;
2622                         reiserfs_warning(super, "sh-458",
2623                                          "cannot init journal device unknown-block(%u,%u): %i",
2624                                          MAJOR(jdev), MINOR(jdev), result);
2625                         return result;
2626                 } else if (jdev != super->s_dev)
2627                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2628
2629                 return 0;
2630         }
2631
2632         journal->j_dev_mode = blkdev_mode;
2633         journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2634         if (IS_ERR(journal->j_dev_bd)) {
2635                 result = PTR_ERR(journal->j_dev_bd);
2636                 journal->j_dev_bd = NULL;
2637                 reiserfs_warning(super, "sh-457",
2638                                  "journal_init_dev: Cannot open '%s': %i",
2639                                  jdev_name, result);
2640                 return result;
2641         }
2642
2643         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2644         reiserfs_info(super,
2645                       "journal_init_dev: journal device: %pg\n",
2646                       journal->j_dev_bd);
2647         return 0;
2648 }
2649
2650 /*
2651  * When creating/tuning a file system user can assign some
2652  * journal params within boundaries which depend on the ratio
2653  * blocksize/standard_blocksize.
2654  *
2655  * For blocks >= standard_blocksize transaction size should
2656  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2657  * then JOURNAL_TRANS_MAX_DEFAULT.
2658  *
2659  * For blocks < standard_blocksize these boundaries should be
2660  * decreased proportionally.
2661  */
2662 #define REISERFS_STANDARD_BLKSIZE (4096)
2663
2664 static int check_advise_trans_params(struct super_block *sb,
2665                                      struct reiserfs_journal *journal)
2666 {
2667         if (journal->j_trans_max) {
2668                 /* Non-default journal params.  Do sanity check for them. */
2669                 int ratio = 1;
2670                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2671                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2672
2673                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2674                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2675                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2676                     JOURNAL_MIN_RATIO) {
2677                         reiserfs_warning(sb, "sh-462",
2678                                          "bad transaction max size (%u). "
2679                                          "FSCK?", journal->j_trans_max);
2680                         return 1;
2681                 }
2682                 if (journal->j_max_batch != (journal->j_trans_max) *
2683                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2684                         reiserfs_warning(sb, "sh-463",
2685                                          "bad transaction max batch (%u). "
2686                                          "FSCK?", journal->j_max_batch);
2687                         return 1;
2688                 }
2689         } else {
2690                 /*
2691                  * Default journal params.
2692                  * The file system was created by old version
2693                  * of mkreiserfs, so some fields contain zeros,
2694                  * and we need to advise proper values for them
2695                  */
2696                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2697                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2698                                          sb->s_blocksize);
2699                         return 1;
2700                 }
2701                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2702                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2703                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2704         }
2705         return 0;
2706 }
2707
2708 /* must be called once on fs mount.  calls journal_read for you */
2709 int journal_init(struct super_block *sb, const char *j_dev_name,
2710                  int old_format, unsigned int commit_max_age)
2711 {
2712         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2713         struct buffer_head *bhjh;
2714         struct reiserfs_super_block *rs;
2715         struct reiserfs_journal_header *jh;
2716         struct reiserfs_journal *journal;
2717         struct reiserfs_journal_list *jl;
2718         int ret;
2719
2720         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2721         if (!journal) {
2722                 reiserfs_warning(sb, "journal-1256",
2723                                  "unable to get memory for journal structure");
2724                 return 1;
2725         }
2726         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2727         INIT_LIST_HEAD(&journal->j_prealloc_list);
2728         INIT_LIST_HEAD(&journal->j_working_list);
2729         INIT_LIST_HEAD(&journal->j_journal_list);
2730         journal->j_persistent_trans = 0;
2731         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2732                                            reiserfs_bmap_count(sb)))
2733                 goto free_and_return;
2734
2735         allocate_bitmap_nodes(sb);
2736
2737         /* reserved for journal area support */
2738         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2739                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2740                                                  / sb->s_blocksize +
2741                                                  reiserfs_bmap_count(sb) +
2742                                                  1 :
2743                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2744                                                  sb->s_blocksize + 2);
2745
2746         /*
2747          * Sanity check to see is the standard journal fitting
2748          * within first bitmap (actual for small blocksizes)
2749          */
2750         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2751             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2752              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2753                 reiserfs_warning(sb, "journal-1393",
2754                                  "journal does not fit for area addressed "
2755                                  "by first of bitmap blocks. It starts at "
2756                                  "%u and its size is %u. Block size %ld",
2757                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2758                                  SB_ONDISK_JOURNAL_SIZE(sb),
2759                                  sb->s_blocksize);
2760                 goto free_and_return;
2761         }
2762
2763         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2764                 reiserfs_warning(sb, "sh-462",
2765                                  "unable to initialize journal device");
2766                 goto free_and_return;
2767         }
2768
2769         rs = SB_DISK_SUPER_BLOCK(sb);
2770
2771         /* read journal header */
2772         bhjh = journal_bread(sb,
2773                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2774                              SB_ONDISK_JOURNAL_SIZE(sb));
2775         if (!bhjh) {
2776                 reiserfs_warning(sb, "sh-459",
2777                                  "unable to read journal header");
2778                 goto free_and_return;
2779         }
2780         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2781
2782         /* make sure that journal matches to the super block */
2783         if (is_reiserfs_jr(rs)
2784             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2785                 sb_jp_journal_magic(rs))) {
2786                 reiserfs_warning(sb, "sh-460",
2787                                  "journal header magic %x (device %pg) does "
2788                                  "not match to magic found in super block %x",
2789                                  jh->jh_journal.jp_journal_magic,
2790                                  journal->j_dev_bd,
2791                                  sb_jp_journal_magic(rs));
2792                 brelse(bhjh);
2793                 goto free_and_return;
2794         }
2795
2796         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2797         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2798         journal->j_max_commit_age =
2799             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2800         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2801
2802         if (check_advise_trans_params(sb, journal) != 0)
2803                 goto free_and_return;
2804         journal->j_default_max_commit_age = journal->j_max_commit_age;
2805
2806         if (commit_max_age != 0) {
2807                 journal->j_max_commit_age = commit_max_age;
2808                 journal->j_max_trans_age = commit_max_age;
2809         }
2810
2811         reiserfs_info(sb, "journal params: device %pg, size %u, "
2812                       "journal first block %u, max trans len %u, max batch %u, "
2813                       "max commit age %u, max trans age %u\n",
2814                       journal->j_dev_bd,
2815                       SB_ONDISK_JOURNAL_SIZE(sb),
2816                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2817                       journal->j_trans_max,
2818                       journal->j_max_batch,
2819                       journal->j_max_commit_age, journal->j_max_trans_age);
2820
2821         brelse(bhjh);
2822
2823         journal->j_list_bitmap_index = 0;
2824         journal_list_init(sb);
2825
2826         memset(journal->j_list_hash_table, 0,
2827                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2828
2829         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2830         spin_lock_init(&journal->j_dirty_buffers_lock);
2831
2832         journal->j_start = 0;
2833         journal->j_len = 0;
2834         journal->j_len_alloc = 0;
2835         atomic_set(&journal->j_wcount, 0);
2836         atomic_set(&journal->j_async_throttle, 0);
2837         journal->j_bcount = 0;
2838         journal->j_trans_start_time = 0;
2839         journal->j_last = NULL;
2840         journal->j_first = NULL;
2841         init_waitqueue_head(&journal->j_join_wait);
2842         mutex_init(&journal->j_mutex);
2843         mutex_init(&journal->j_flush_mutex);
2844
2845         journal->j_trans_id = 10;
2846         journal->j_mount_id = 10;
2847         journal->j_state = 0;
2848         atomic_set(&journal->j_jlock, 0);
2849         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2850         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2851         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2852         journal->j_cnode_used = 0;
2853         journal->j_must_wait = 0;
2854
2855         if (journal->j_cnode_free == 0) {
2856                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2857                                  "allocation failed (%ld bytes). Journal is "
2858                                  "too large for available memory. Usually "
2859                                  "this is due to a journal that is too large.",
2860                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2861                 goto free_and_return;
2862         }
2863
2864         init_journal_hash(sb);
2865         jl = journal->j_current_jl;
2866
2867         /*
2868          * get_list_bitmap() may call flush_commit_list() which
2869          * requires the lock. Calling flush_commit_list() shouldn't happen
2870          * this early but I like to be paranoid.
2871          */
2872         reiserfs_write_lock(sb);
2873         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2874         reiserfs_write_unlock(sb);
2875         if (!jl->j_list_bitmap) {
2876                 reiserfs_warning(sb, "journal-2005",
2877                                  "get_list_bitmap failed for journal list 0");
2878                 goto free_and_return;
2879         }
2880
2881         ret = journal_read(sb);
2882         if (ret < 0) {
2883                 reiserfs_warning(sb, "reiserfs-2006",
2884                                  "Replay Failure, unable to mount");
2885                 goto free_and_return;
2886         }
2887
2888         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2889         journal->j_work_sb = sb;
2890         return 0;
2891 free_and_return:
2892         free_journal_ram(sb);
2893         return 1;
2894 }
2895
2896 /*
2897  * test for a polite end of the current transaction.  Used by file_write,
2898  * and should be used by delete to make sure they don't write more than
2899  * can fit inside a single transaction
2900  */
2901 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2902                                    int new_alloc)
2903 {
2904         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2905         time64_t now = ktime_get_seconds();
2906         /* cannot restart while nested */
2907         BUG_ON(!th->t_trans_id);
2908         if (th->t_refcount > 1)
2909                 return 0;
2910         if (journal->j_must_wait > 0 ||
2911             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2912             atomic_read(&journal->j_jlock) ||
2913             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2914             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2915                 return 1;
2916         }
2917
2918         journal->j_len_alloc += new_alloc;
2919         th->t_blocks_allocated += new_alloc ;
2920         return 0;
2921 }
2922
2923 /* this must be called inside a transaction */
2924 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2925 {
2926         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2927         BUG_ON(!th->t_trans_id);
2928         journal->j_must_wait = 1;
2929         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2930         return;
2931 }
2932
2933 /* this must be called without a transaction started */
2934 void reiserfs_allow_writes(struct super_block *s)
2935 {
2936         struct reiserfs_journal *journal = SB_JOURNAL(s);
2937         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2938         wake_up(&journal->j_join_wait);
2939 }
2940
2941 /* this must be called without a transaction started */
2942 void reiserfs_wait_on_write_block(struct super_block *s)
2943 {
2944         struct reiserfs_journal *journal = SB_JOURNAL(s);
2945         wait_event(journal->j_join_wait,
2946                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2947 }
2948
2949 static void queue_log_writer(struct super_block *s)
2950 {
2951         wait_queue_entry_t wait;
2952         struct reiserfs_journal *journal = SB_JOURNAL(s);
2953         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2954
2955         /*
2956          * we don't want to use wait_event here because
2957          * we only want to wait once.
2958          */
2959         init_waitqueue_entry(&wait, current);
2960         add_wait_queue(&journal->j_join_wait, &wait);
2961         set_current_state(TASK_UNINTERRUPTIBLE);
2962         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2963                 int depth = reiserfs_write_unlock_nested(s);
2964                 schedule();
2965                 reiserfs_write_lock_nested(s, depth);
2966         }
2967         __set_current_state(TASK_RUNNING);
2968         remove_wait_queue(&journal->j_join_wait, &wait);
2969 }
2970
2971 static void wake_queued_writers(struct super_block *s)
2972 {
2973         struct reiserfs_journal *journal = SB_JOURNAL(s);
2974         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2975                 wake_up(&journal->j_join_wait);
2976 }
2977
2978 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2979 {
2980         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2981         unsigned long bcount = journal->j_bcount;
2982         while (1) {
2983                 int depth;
2984
2985                 depth = reiserfs_write_unlock_nested(sb);
2986                 schedule_timeout_uninterruptible(1);
2987                 reiserfs_write_lock_nested(sb, depth);
2988
2989                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
2990                 while ((atomic_read(&journal->j_wcount) > 0 ||
2991                         atomic_read(&journal->j_jlock)) &&
2992                        journal->j_trans_id == trans_id) {
2993                         queue_log_writer(sb);
2994                 }
2995                 if (journal->j_trans_id != trans_id)
2996                         break;
2997                 if (bcount == journal->j_bcount)
2998                         break;
2999                 bcount = journal->j_bcount;
3000         }
3001 }
3002
3003 /*
3004  * join == true if you must join an existing transaction.
3005  * join == false if you can deal with waiting for others to finish
3006  *
3007  * this will block until the transaction is joinable.  send the number of
3008  * blocks you expect to use in nblocks.
3009 */
3010 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3011                               struct super_block *sb, unsigned long nblocks,
3012                               int join)
3013 {
3014         time64_t now = ktime_get_seconds();
3015         unsigned int old_trans_id;
3016         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3017         struct reiserfs_transaction_handle myth;
3018         int sched_count = 0;
3019         int retval;
3020         int depth;
3021
3022         reiserfs_check_lock_depth(sb, "journal_begin");
3023         BUG_ON(nblocks > journal->j_trans_max);
3024
3025         PROC_INFO_INC(sb, journal.journal_being);
3026         /* set here for journal_join */
3027         th->t_refcount = 1;
3028         th->t_super = sb;
3029
3030 relock:
3031         lock_journal(sb);
3032         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3033                 unlock_journal(sb);
3034                 retval = journal->j_errno;
3035                 goto out_fail;
3036         }
3037         journal->j_bcount++;
3038
3039         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3040                 unlock_journal(sb);
3041                 depth = reiserfs_write_unlock_nested(sb);
3042                 reiserfs_wait_on_write_block(sb);
3043                 reiserfs_write_lock_nested(sb, depth);
3044                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3045                 goto relock;
3046         }
3047         now = ktime_get_seconds();
3048
3049         /*
3050          * if there is no room in the journal OR
3051          * if this transaction is too old, and we weren't called joinable,
3052          * wait for it to finish before beginning we don't sleep if there
3053          * aren't other writers
3054          */
3055
3056         if ((!join && journal->j_must_wait > 0) ||
3057             (!join
3058              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3059             || (!join && atomic_read(&journal->j_wcount) > 0
3060                 && journal->j_trans_start_time > 0
3061                 && (now - journal->j_trans_start_time) >
3062                 journal->j_max_trans_age) || (!join
3063                                               && atomic_read(&journal->j_jlock))
3064             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3065
3066                 old_trans_id = journal->j_trans_id;
3067                 /* allow others to finish this transaction */
3068                 unlock_journal(sb);
3069
3070                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3071                     journal->j_max_batch &&
3072                     ((journal->j_len + nblocks + 2) * 100) <
3073                     (journal->j_len_alloc * 75)) {
3074                         if (atomic_read(&journal->j_wcount) > 10) {
3075                                 sched_count++;
3076                                 queue_log_writer(sb);
3077                                 goto relock;
3078                         }
3079                 }
3080                 /*
3081                  * don't mess with joining the transaction if all we
3082                  * have to do is wait for someone else to do a commit
3083                  */
3084                 if (atomic_read(&journal->j_jlock)) {
3085                         while (journal->j_trans_id == old_trans_id &&
3086                                atomic_read(&journal->j_jlock)) {
3087                                 queue_log_writer(sb);
3088                         }
3089                         goto relock;
3090                 }
3091                 retval = journal_join(&myth, sb);
3092                 if (retval)
3093                         goto out_fail;
3094
3095                 /* someone might have ended the transaction while we joined */
3096                 if (old_trans_id != journal->j_trans_id) {
3097                         retval = do_journal_end(&myth, 0);
3098                 } else {
3099                         retval = do_journal_end(&myth, COMMIT_NOW);
3100                 }
3101
3102                 if (retval)
3103                         goto out_fail;
3104
3105                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3106                 goto relock;
3107         }
3108         /* we are the first writer, set trans_id */
3109         if (journal->j_trans_start_time == 0) {
3110                 journal->j_trans_start_time = ktime_get_seconds();
3111         }
3112         atomic_inc(&journal->j_wcount);
3113         journal->j_len_alloc += nblocks;
3114         th->t_blocks_logged = 0;
3115         th->t_blocks_allocated = nblocks;
3116         th->t_trans_id = journal->j_trans_id;
3117         unlock_journal(sb);
3118         INIT_LIST_HEAD(&th->t_list);
3119         return 0;
3120
3121 out_fail:
3122         memset(th, 0, sizeof(*th));
3123         /*
3124          * Re-set th->t_super, so we can properly keep track of how many
3125          * persistent transactions there are. We need to do this so if this
3126          * call is part of a failed restart_transaction, we can free it later
3127          */
3128         th->t_super = sb;
3129         return retval;
3130 }
3131
3132 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3133                                                                     super_block
3134                                                                     *s,
3135                                                                     int nblocks)
3136 {
3137         int ret;
3138         struct reiserfs_transaction_handle *th;
3139
3140         /*
3141          * if we're nesting into an existing transaction.  It will be
3142          * persistent on its own
3143          */
3144         if (reiserfs_transaction_running(s)) {
3145                 th = current->journal_info;
3146                 th->t_refcount++;
3147                 BUG_ON(th->t_refcount < 2);
3148
3149                 return th;
3150         }
3151         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3152         if (!th)
3153                 return NULL;
3154         ret = journal_begin(th, s, nblocks);
3155         if (ret) {
3156                 kfree(th);
3157                 return NULL;
3158         }
3159
3160         SB_JOURNAL(s)->j_persistent_trans++;
3161         return th;
3162 }
3163
3164 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3165 {
3166         struct super_block *s = th->t_super;
3167         int ret = 0;
3168         if (th->t_trans_id)
3169                 ret = journal_end(th);
3170         else
3171                 ret = -EIO;
3172         if (th->t_refcount == 0) {
3173                 SB_JOURNAL(s)->j_persistent_trans--;
3174                 kfree(th);
3175         }
3176         return ret;
3177 }
3178
3179 static int journal_join(struct reiserfs_transaction_handle *th,
3180                         struct super_block *sb)
3181 {
3182         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3183
3184         /*
3185          * this keeps do_journal_end from NULLing out the
3186          * current->journal_info pointer
3187          */
3188         th->t_handle_save = cur_th;
3189         BUG_ON(cur_th && cur_th->t_refcount > 1);
3190         return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3191 }
3192
3193 int journal_join_abort(struct reiserfs_transaction_handle *th,
3194                        struct super_block *sb)
3195 {
3196         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3197
3198         /*
3199          * this keeps do_journal_end from NULLing out the
3200          * current->journal_info pointer
3201          */
3202         th->t_handle_save = cur_th;
3203         BUG_ON(cur_th && cur_th->t_refcount > 1);
3204         return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3205 }
3206
3207 int journal_begin(struct reiserfs_transaction_handle *th,
3208                   struct super_block *sb, unsigned long nblocks)
3209 {
3210         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3211         int ret;
3212
3213         th->t_handle_save = NULL;
3214         if (cur_th) {
3215                 /* we are nesting into the current transaction */
3216                 if (cur_th->t_super == sb) {
3217                         BUG_ON(!cur_th->t_refcount);
3218                         cur_th->t_refcount++;
3219                         memcpy(th, cur_th, sizeof(*th));
3220                         if (th->t_refcount <= 1)
3221                                 reiserfs_warning(sb, "reiserfs-2005",
3222                                                  "BAD: refcount <= 1, but "
3223                                                  "journal_info != 0");
3224                         return 0;
3225                 } else {
3226                         /*
3227                          * we've ended up with a handle from a different
3228                          * filesystem.  save it and restore on journal_end.
3229                          * This should never really happen...
3230                          */
3231                         reiserfs_warning(sb, "clm-2100",
3232                                          "nesting info a different FS");
3233                         th->t_handle_save = current->journal_info;
3234                         current->journal_info = th;
3235                 }
3236         } else {
3237                 current->journal_info = th;
3238         }
3239         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3240         BUG_ON(current->journal_info != th);
3241
3242         /*
3243          * I guess this boils down to being the reciprocal of clm-2100 above.
3244          * If do_journal_begin_r fails, we need to put it back, since
3245          * journal_end won't be called to do it. */
3246         if (ret)
3247                 current->journal_info = th->t_handle_save;
3248         else
3249                 BUG_ON(!th->t_refcount);
3250
3251         return ret;
3252 }
3253
3254 /*
3255  * puts bh into the current transaction.  If it was already there, reorders
3256  * removes the old pointers from the hash, and puts new ones in (to make
3257  * sure replay happen in the right order).
3258  *
3259  * if it was dirty, cleans and files onto the clean list.  I can't let it
3260  * be dirty again until the transaction is committed.
3261  *
3262  * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3263  */
3264 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3265                        struct buffer_head *bh)
3266 {
3267         struct super_block *sb = th->t_super;
3268         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3269         struct reiserfs_journal_cnode *cn = NULL;
3270         int count_already_incd = 0;
3271         int prepared = 0;
3272         BUG_ON(!th->t_trans_id);
3273
3274         PROC_INFO_INC(sb, journal.mark_dirty);
3275         if (th->t_trans_id != journal->j_trans_id) {
3276                 reiserfs_panic(th->t_super, "journal-1577",
3277                                "handle trans id %ld != current trans id %ld",
3278                                th->t_trans_id, journal->j_trans_id);
3279         }
3280
3281         prepared = test_clear_buffer_journal_prepared(bh);
3282         clear_buffer_journal_restore_dirty(bh);
3283         /* already in this transaction, we are done */
3284         if (buffer_journaled(bh)) {
3285                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3286                 return 0;
3287         }
3288
3289         /*
3290          * this must be turned into a panic instead of a warning.  We can't
3291          * allow a dirty or journal_dirty or locked buffer to be logged, as
3292          * some changes could get to disk too early.  NOT GOOD.
3293          */
3294         if (!prepared || buffer_dirty(bh)) {
3295                 reiserfs_warning(sb, "journal-1777",
3296                                  "buffer %llu bad state "
3297                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3298                                  (unsigned long long)bh->b_blocknr,
3299                                  prepared ? ' ' : '!',
3300                                  buffer_locked(bh) ? ' ' : '!',
3301                                  buffer_dirty(bh) ? ' ' : '!',
3302                                  buffer_journal_dirty(bh) ? ' ' : '!');
3303         }
3304
3305         if (atomic_read(&journal->j_wcount) <= 0) {
3306                 reiserfs_warning(sb, "journal-1409",
3307                                  "returning because j_wcount was %d",
3308                                  atomic_read(&journal->j_wcount));
3309                 return 1;
3310         }
3311         /*
3312          * this error means I've screwed up, and we've overflowed
3313          * the transaction.  Nothing can be done here, except make the
3314          * FS readonly or panic.
3315          */
3316         if (journal->j_len >= journal->j_trans_max) {
3317                 reiserfs_panic(th->t_super, "journal-1413",
3318                                "j_len (%lu) is too big",
3319                                journal->j_len);
3320         }
3321
3322         if (buffer_journal_dirty(bh)) {
3323                 count_already_incd = 1;
3324                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3325                 clear_buffer_journal_dirty(bh);
3326         }
3327
3328         if (journal->j_len > journal->j_len_alloc) {
3329                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3330         }
3331
3332         set_buffer_journaled(bh);
3333
3334         /* now put this guy on the end */
3335         if (!cn) {
3336                 cn = get_cnode(sb);
3337                 if (!cn) {
3338                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3339                 }
3340
3341                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3342                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3343                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3344                 }
3345                 th->t_blocks_logged++;
3346                 journal->j_len++;
3347
3348                 cn->bh = bh;
3349                 cn->blocknr = bh->b_blocknr;
3350                 cn->sb = sb;
3351                 cn->jlist = NULL;
3352                 insert_journal_hash(journal->j_hash_table, cn);
3353                 if (!count_already_incd) {
3354                         get_bh(bh);
3355                 }
3356         }
3357         cn->next = NULL;
3358         cn->prev = journal->j_last;
3359         cn->bh = bh;
3360         if (journal->j_last) {
3361                 journal->j_last->next = cn;
3362                 journal->j_last = cn;
3363         } else {
3364                 journal->j_first = cn;
3365                 journal->j_last = cn;
3366         }
3367         reiserfs_schedule_old_flush(sb);
3368         return 0;
3369 }
3370
3371 int journal_end(struct reiserfs_transaction_handle *th)
3372 {
3373         struct super_block *sb = th->t_super;
3374         if (!current->journal_info && th->t_refcount > 1)
3375                 reiserfs_warning(sb, "REISER-NESTING",
3376                                  "th NULL, refcount %d", th->t_refcount);
3377
3378         if (!th->t_trans_id) {
3379                 WARN_ON(1);
3380                 return -EIO;
3381         }
3382
3383         th->t_refcount--;
3384         if (th->t_refcount > 0) {
3385                 struct reiserfs_transaction_handle *cur_th =
3386                     current->journal_info;
3387
3388                 /*
3389                  * we aren't allowed to close a nested transaction on a
3390                  * different filesystem from the one in the task struct
3391                  */
3392                 BUG_ON(cur_th->t_super != th->t_super);
3393
3394                 if (th != cur_th) {
3395                         memcpy(current->journal_info, th, sizeof(*th));
3396                         th->t_trans_id = 0;
3397                 }
3398                 return 0;
3399         } else {
3400                 return do_journal_end(th, 0);
3401         }
3402 }
3403
3404 /*
3405  * removes from the current transaction, relsing and descrementing any counters.
3406  * also files the removed buffer directly onto the clean list
3407  *
3408  * called by journal_mark_freed when a block has been deleted
3409  *
3410  * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3411  */
3412 static int remove_from_transaction(struct super_block *sb,
3413                                    b_blocknr_t blocknr, int already_cleaned)
3414 {
3415         struct buffer_head *bh;
3416         struct reiserfs_journal_cnode *cn;
3417         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3418         int ret = 0;
3419
3420         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3421         if (!cn || !cn->bh) {
3422                 return ret;
3423         }
3424         bh = cn->bh;
3425         if (cn->prev) {
3426                 cn->prev->next = cn->next;
3427         }
3428         if (cn->next) {
3429                 cn->next->prev = cn->prev;
3430         }
3431         if (cn == journal->j_first) {
3432                 journal->j_first = cn->next;
3433         }
3434         if (cn == journal->j_last) {
3435                 journal->j_last = cn->prev;
3436         }
3437         remove_journal_hash(sb, journal->j_hash_table, NULL,
3438                             bh->b_blocknr, 0);
3439         clear_buffer_journaled(bh);     /* don't log this one */
3440
3441         if (!already_cleaned) {
3442                 clear_buffer_journal_dirty(bh);
3443                 clear_buffer_dirty(bh);
3444                 clear_buffer_journal_test(bh);
3445                 put_bh(bh);
3446                 if (atomic_read(&bh->b_count) < 0) {
3447                         reiserfs_warning(sb, "journal-1752",
3448                                          "b_count < 0");
3449                 }
3450                 ret = 1;
3451         }
3452         journal->j_len--;
3453         journal->j_len_alloc--;
3454         free_cnode(sb, cn);
3455         return ret;
3456 }
3457
3458 /*
3459  * for any cnode in a journal list, it can only be dirtied of all the
3460  * transactions that include it are committed to disk.
3461  * this checks through each transaction, and returns 1 if you are allowed
3462  * to dirty, and 0 if you aren't
3463  *
3464  * it is called by dirty_journal_list, which is called after
3465  * flush_commit_list has gotten all the log blocks for a given
3466  * transaction on disk
3467  *
3468  */
3469 static int can_dirty(struct reiserfs_journal_cnode *cn)
3470 {
3471         struct super_block *sb = cn->sb;
3472         b_blocknr_t blocknr = cn->blocknr;
3473         struct reiserfs_journal_cnode *cur = cn->hprev;
3474         int can_dirty = 1;
3475
3476         /*
3477          * first test hprev.  These are all newer than cn, so any node here
3478          * with the same block number and dev means this node can't be sent
3479          * to disk right now.
3480          */
3481         while (cur && can_dirty) {
3482                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3483                     cur->blocknr == blocknr) {
3484                         can_dirty = 0;
3485                 }
3486                 cur = cur->hprev;
3487         }
3488         /*
3489          * then test hnext.  These are all older than cn.  As long as they
3490          * are committed to the log, it is safe to write cn to disk
3491          */
3492         cur = cn->hnext;
3493         while (cur && can_dirty) {
3494                 if (cur->jlist && cur->jlist->j_len > 0 &&
3495                     atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3496                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3497                         can_dirty = 0;
3498                 }
3499                 cur = cur->hnext;
3500         }
3501         return can_dirty;
3502 }
3503
3504 /*
3505  * syncs the commit blocks, but does not force the real buffers to disk
3506  * will wait until the current transaction is done/committed before returning
3507  */
3508 int journal_end_sync(struct reiserfs_transaction_handle *th)
3509 {
3510         struct super_block *sb = th->t_super;
3511         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3512
3513         BUG_ON(!th->t_trans_id);
3514         /* you can sync while nested, very, very bad */
3515         BUG_ON(th->t_refcount > 1);
3516         if (journal->j_len == 0) {
3517                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3518                                              1);
3519                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3520         }
3521         return do_journal_end(th, COMMIT_NOW | WAIT);
3522 }
3523
3524 /* writeback the pending async commits to disk */
3525 static void flush_async_commits(struct work_struct *work)
3526 {
3527         struct reiserfs_journal *journal =
3528                 container_of(work, struct reiserfs_journal, j_work.work);
3529         struct super_block *sb = journal->j_work_sb;
3530         struct reiserfs_journal_list *jl;
3531         struct list_head *entry;
3532
3533         reiserfs_write_lock(sb);
3534         if (!list_empty(&journal->j_journal_list)) {
3535                 /* last entry is the youngest, commit it and you get everything */
3536                 entry = journal->j_journal_list.prev;
3537                 jl = JOURNAL_LIST_ENTRY(entry);
3538                 flush_commit_list(sb, jl, 1);
3539         }
3540         reiserfs_write_unlock(sb);
3541 }
3542
3543 /*
3544  * flushes any old transactions to disk
3545  * ends the current transaction if it is too old
3546  */
3547 void reiserfs_flush_old_commits(struct super_block *sb)
3548 {
3549         time64_t now;
3550         struct reiserfs_transaction_handle th;
3551         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3552
3553         now = ktime_get_seconds();
3554         /*
3555          * safety check so we don't flush while we are replaying the log during
3556          * mount
3557          */
3558         if (list_empty(&journal->j_journal_list))
3559                 return;
3560
3561         /*
3562          * check the current transaction.  If there are no writers, and it is
3563          * too old, finish it, and force the commit blocks to disk
3564          */
3565         if (atomic_read(&journal->j_wcount) <= 0 &&
3566             journal->j_trans_start_time > 0 &&
3567             journal->j_len > 0 &&
3568             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3569                 if (!journal_join(&th, sb)) {
3570                         reiserfs_prepare_for_journal(sb,
3571                                                      SB_BUFFER_WITH_SB(sb),
3572                                                      1);
3573                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3574
3575                         /*
3576                          * we're only being called from kreiserfsd, it makes
3577                          * no sense to do an async commit so that kreiserfsd
3578                          * can do it later
3579                          */
3580                         do_journal_end(&th, COMMIT_NOW | WAIT);
3581                 }
3582         }
3583 }
3584
3585 /*
3586  * returns 0 if do_journal_end should return right away, returns 1 if
3587  * do_journal_end should finish the commit
3588  *
3589  * if the current transaction is too old, but still has writers, this will
3590  * wait on j_join_wait until all the writers are done.  By the time it
3591  * wakes up, the transaction it was called has already ended, so it just
3592  * flushes the commit list and returns 0.
3593  *
3594  * Won't batch when flush or commit_now is set.  Also won't batch when
3595  * others are waiting on j_join_wait.
3596  *
3597  * Note, we can't allow the journal_end to proceed while there are still
3598  * writers in the log.
3599  */
3600 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3601 {
3602
3603         time64_t now;
3604         int flush = flags & FLUSH_ALL;
3605         int commit_now = flags & COMMIT_NOW;
3606         int wait_on_commit = flags & WAIT;
3607         struct reiserfs_journal_list *jl;
3608         struct super_block *sb = th->t_super;
3609         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3610
3611         BUG_ON(!th->t_trans_id);
3612
3613         if (th->t_trans_id != journal->j_trans_id) {
3614                 reiserfs_panic(th->t_super, "journal-1577",
3615                                "handle trans id %ld != current trans id %ld",
3616                                th->t_trans_id, journal->j_trans_id);
3617         }
3618
3619         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3620         /* <= 0 is allowed.  unmounting might not call begin */
3621         if (atomic_read(&journal->j_wcount) > 0)
3622                 atomic_dec(&journal->j_wcount);
3623
3624         /*
3625          * BUG, deal with case where j_len is 0, but people previously
3626          * freed blocks need to be released will be dealt with by next
3627          * transaction that actually writes something, but should be taken
3628          * care of in this trans
3629          */
3630         BUG_ON(journal->j_len == 0);
3631
3632         /*
3633          * if wcount > 0, and we are called to with flush or commit_now,
3634          * we wait on j_join_wait.  We will wake up when the last writer has
3635          * finished the transaction, and started it on its way to the disk.
3636          * Then, we flush the commit or journal list, and just return 0
3637          * because the rest of journal end was already done for this
3638          * transaction.
3639          */
3640         if (atomic_read(&journal->j_wcount) > 0) {
3641                 if (flush || commit_now) {
3642                         unsigned trans_id;
3643
3644                         jl = journal->j_current_jl;
3645                         trans_id = jl->j_trans_id;
3646                         if (wait_on_commit)
3647                                 jl->j_state |= LIST_COMMIT_PENDING;
3648                         atomic_set(&journal->j_jlock, 1);
3649                         if (flush) {
3650                                 journal->j_next_full_flush = 1;
3651                         }
3652                         unlock_journal(sb);
3653
3654                         /*
3655                          * sleep while the current transaction is
3656                          * still j_jlocked
3657                          */
3658                         while (journal->j_trans_id == trans_id) {
3659                                 if (atomic_read(&journal->j_jlock)) {
3660                                         queue_log_writer(sb);
3661                                 } else {
3662                                         lock_journal(sb);
3663                                         if (journal->j_trans_id == trans_id) {
3664                                                 atomic_set(&journal->j_jlock,
3665                                                            1);
3666                                         }
3667                                         unlock_journal(sb);
3668                                 }
3669                         }
3670                         BUG_ON(journal->j_trans_id == trans_id);
3671
3672                         if (commit_now
3673                             && journal_list_still_alive(sb, trans_id)
3674                             && wait_on_commit) {
3675                                 flush_commit_list(sb, jl, 1);
3676                         }
3677                         return 0;
3678                 }
3679                 unlock_journal(sb);
3680                 return 0;
3681         }
3682
3683         /* deal with old transactions where we are the last writers */
3684         now = ktime_get_seconds();
3685         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3686                 commit_now = 1;
3687                 journal->j_next_async_flush = 1;
3688         }
3689         /* don't batch when someone is waiting on j_join_wait */
3690         /* don't batch when syncing the commit or flushing the whole trans */
3691         if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3692             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3693             && journal->j_len_alloc < journal->j_max_batch
3694             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3695                 journal->j_bcount++;
3696                 unlock_journal(sb);
3697                 return 0;
3698         }
3699
3700         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3701                 reiserfs_panic(sb, "journal-003",
3702                                "j_start (%ld) is too high",
3703                                journal->j_start);
3704         }
3705         return 1;
3706 }
3707
3708 /*
3709  * Does all the work that makes deleting blocks safe.
3710  * when deleting a block mark BH_JNew, just remove it from the current
3711  * transaction, clean it's buffer_head and move on.
3712  *
3713  * otherwise:
3714  * set a bit for the block in the journal bitmap.  That will prevent it from
3715  * being allocated for unformatted nodes before this transaction has finished.
3716  *
3717  * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3718  * That will prevent any old transactions with this block from trying to flush
3719  * to the real location.  Since we aren't removing the cnode from the
3720  * journal_list_hash, *the block can't be reallocated yet.
3721  *
3722  * Then remove it from the current transaction, decrementing any counters and
3723  * filing it on the clean list.
3724  */
3725 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3726                        struct super_block *sb, b_blocknr_t blocknr)
3727 {
3728         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3729         struct reiserfs_journal_cnode *cn = NULL;
3730         struct buffer_head *bh = NULL;
3731         struct reiserfs_list_bitmap *jb = NULL;
3732         int cleaned = 0;
3733         BUG_ON(!th->t_trans_id);
3734
3735         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3736         if (cn && cn->bh) {
3737                 bh = cn->bh;
3738                 get_bh(bh);
3739         }
3740         /* if it is journal new, we just remove it from this transaction */
3741         if (bh && buffer_journal_new(bh)) {
3742                 clear_buffer_journal_new(bh);
3743                 clear_prepared_bits(bh);
3744                 reiserfs_clean_and_file_buffer(bh);
3745                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3746         } else {
3747                 /*
3748                  * set the bit for this block in the journal bitmap
3749                  * for this transaction
3750                  */
3751                 jb = journal->j_current_jl->j_list_bitmap;
3752                 if (!jb) {
3753                         reiserfs_panic(sb, "journal-1702",
3754                                        "journal_list_bitmap is NULL");
3755                 }
3756                 set_bit_in_list_bitmap(sb, blocknr, jb);
3757
3758                 /* Note, the entire while loop is not allowed to schedule.  */
3759
3760                 if (bh) {
3761                         clear_prepared_bits(bh);
3762                         reiserfs_clean_and_file_buffer(bh);
3763                 }
3764                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3765
3766                 /*
3767                  * find all older transactions with this block,
3768                  * make sure they don't try to write it out
3769                  */
3770                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3771                                           blocknr);
3772                 while (cn) {
3773                         if (sb == cn->sb && blocknr == cn->blocknr) {
3774                                 set_bit(BLOCK_FREED, &cn->state);
3775                                 if (cn->bh) {
3776                                         /*
3777                                          * remove_from_transaction will brelse
3778                                          * the buffer if it was in the current
3779                                          * trans
3780                                          */
3781                                         if (!cleaned) {
3782                                                 clear_buffer_journal_dirty(cn->
3783                                                                            bh);
3784                                                 clear_buffer_dirty(cn->bh);
3785                                                 clear_buffer_journal_test(cn->
3786                                                                           bh);
3787                                                 cleaned = 1;
3788                                                 put_bh(cn->bh);
3789                                                 if (atomic_read
3790                                                     (&cn->bh->b_count) < 0) {
3791                                                         reiserfs_warning(sb,
3792                                                                  "journal-2138",
3793                                                                  "cn->bh->b_count < 0");
3794                                                 }
3795                                         }
3796                                         /*
3797                                          * since we are clearing the bh,
3798                                          * we MUST dec nonzerolen
3799                                          */
3800                                         if (cn->jlist) {
3801                                                 atomic_dec(&cn->jlist->
3802                                                            j_nonzerolen);
3803                                         }
3804                                         cn->bh = NULL;
3805                                 }
3806                         }
3807                         cn = cn->hnext;
3808                 }
3809         }
3810
3811         if (bh)
3812                 release_buffer_page(bh); /* get_hash grabs the buffer */
3813         return 0;
3814 }
3815
3816 void reiserfs_update_inode_transaction(struct inode *inode)
3817 {
3818         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3819         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3820         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3821 }
3822
3823 /*
3824  * returns -1 on error, 0 if no commits/barriers were done and 1
3825  * if a transaction was actually committed and the barrier was done
3826  */
3827 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3828                              struct reiserfs_journal_list *jl)
3829 {
3830         struct reiserfs_transaction_handle th;
3831         struct super_block *sb = inode->i_sb;
3832         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3833         int ret = 0;
3834
3835         /*
3836          * is it from the current transaction,
3837          * or from an unknown transaction?
3838          */
3839         if (id == journal->j_trans_id) {
3840                 jl = journal->j_current_jl;
3841                 /*
3842                  * try to let other writers come in and
3843                  * grow this transaction
3844                  */
3845                 let_transaction_grow(sb, id);
3846                 if (journal->j_trans_id != id) {
3847                         goto flush_commit_only;
3848                 }
3849
3850                 ret = journal_begin(&th, sb, 1);
3851                 if (ret)
3852                         return ret;
3853
3854                 /* someone might have ended this transaction while we joined */
3855                 if (journal->j_trans_id != id) {
3856                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3857                                                      1);
3858                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3859                         ret = journal_end(&th);
3860                         goto flush_commit_only;
3861                 }
3862
3863                 ret = journal_end_sync(&th);
3864                 if (!ret)
3865                         ret = 1;
3866
3867         } else {
3868                 /*
3869                  * this gets tricky, we have to make sure the journal list in
3870                  * the inode still exists.  We know the list is still around
3871                  * if we've got a larger transaction id than the oldest list
3872                  */
3873 flush_commit_only:
3874                 if (journal_list_still_alive(inode->i_sb, id)) {
3875                         /*
3876                          * we only set ret to 1 when we know for sure
3877                          * the barrier hasn't been started yet on the commit
3878                          * block.
3879                          */
3880                         if (atomic_read(&jl->j_commit_left) > 1)
3881                                 ret = 1;
3882                         flush_commit_list(sb, jl, 1);
3883                         if (journal->j_errno)
3884                                 ret = journal->j_errno;
3885                 }
3886         }
3887         /* otherwise the list is gone, and long since committed */
3888         return ret;
3889 }
3890
3891 int reiserfs_commit_for_inode(struct inode *inode)
3892 {
3893         unsigned int id = REISERFS_I(inode)->i_trans_id;
3894         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3895
3896         /*
3897          * for the whole inode, assume unset id means it was
3898          * changed in the current transaction.  More conservative
3899          */
3900         if (!id || !jl) {
3901                 reiserfs_update_inode_transaction(inode);
3902                 id = REISERFS_I(inode)->i_trans_id;
3903                 /* jl will be updated in __commit_trans_jl */
3904         }
3905
3906         return __commit_trans_jl(inode, id, jl);
3907 }
3908
3909 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3910                                       struct buffer_head *bh)
3911 {
3912         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3913         PROC_INFO_INC(sb, journal.restore_prepared);
3914         if (!bh) {
3915                 return;
3916         }
3917         if (test_clear_buffer_journal_restore_dirty(bh) &&
3918             buffer_journal_dirty(bh)) {
3919                 struct reiserfs_journal_cnode *cn;
3920                 reiserfs_write_lock(sb);
3921                 cn = get_journal_hash_dev(sb,
3922                                           journal->j_list_hash_table,
3923                                           bh->b_blocknr);
3924                 if (cn && can_dirty(cn)) {
3925                         set_buffer_journal_test(bh);
3926                         mark_buffer_dirty(bh);
3927                 }
3928                 reiserfs_write_unlock(sb);
3929         }
3930         clear_buffer_journal_prepared(bh);
3931 }
3932
3933 extern struct tree_balance *cur_tb;
3934 /*
3935  * before we can change a metadata block, we have to make sure it won't
3936  * be written to disk while we are altering it.  So, we must:
3937  * clean it
3938  * wait on it.
3939  */
3940 int reiserfs_prepare_for_journal(struct super_block *sb,
3941                                  struct buffer_head *bh, int wait)
3942 {
3943         PROC_INFO_INC(sb, journal.prepare);
3944
3945         if (!trylock_buffer(bh)) {
3946                 if (!wait)
3947                         return 0;
3948                 lock_buffer(bh);
3949         }
3950         set_buffer_journal_prepared(bh);
3951         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3952                 clear_buffer_journal_test(bh);
3953                 set_buffer_journal_restore_dirty(bh);
3954         }
3955         unlock_buffer(bh);
3956         return 1;
3957 }
3958
3959 /*
3960  * long and ugly.  If flush, will not return until all commit
3961  * blocks and all real buffers in the trans are on disk.
3962  * If no_async, won't return until all commit blocks are on disk.
3963  *
3964  * keep reading, there are comments as you go along
3965  *
3966  * If the journal is aborted, we just clean up. Things like flushing
3967  * journal lists, etc just won't happen.
3968  */
3969 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3970 {
3971         struct super_block *sb = th->t_super;
3972         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3973         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3974         struct reiserfs_journal_cnode *last_cn = NULL;
3975         struct reiserfs_journal_desc *desc;
3976         struct reiserfs_journal_commit *commit;
3977         struct buffer_head *c_bh;       /* commit bh */
3978         struct buffer_head *d_bh;       /* desc bh */
3979         int cur_write_start = 0;        /* start index of current log write */
3980         int i;
3981         int flush;
3982         int wait_on_commit;
3983         struct reiserfs_journal_list *jl, *temp_jl;
3984         struct list_head *entry, *safe;
3985         unsigned long jindex;
3986         unsigned int commit_trans_id;
3987         int trans_half;
3988         int depth;
3989
3990         BUG_ON(th->t_refcount > 1);
3991         BUG_ON(!th->t_trans_id);
3992         BUG_ON(!th->t_super);
3993
3994         /*
3995          * protect flush_older_commits from doing mistakes if the
3996          * transaction ID counter gets overflowed.
3997          */
3998         if (th->t_trans_id == ~0U)
3999                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4000         flush = flags & FLUSH_ALL;
4001         wait_on_commit = flags & WAIT;
4002
4003         current->journal_info = th->t_handle_save;
4004         reiserfs_check_lock_depth(sb, "journal end");
4005         if (journal->j_len == 0) {
4006                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4007                                              1);
4008                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4009         }
4010
4011         lock_journal(sb);
4012         if (journal->j_next_full_flush) {
4013                 flags |= FLUSH_ALL;
4014                 flush = 1;
4015         }
4016         if (journal->j_next_async_flush) {
4017                 flags |= COMMIT_NOW | WAIT;
4018                 wait_on_commit = 1;
4019         }
4020
4021         /*
4022          * check_journal_end locks the journal, and unlocks if it does
4023          * not return 1 it tells us if we should continue with the
4024          * journal_end, or just return
4025          */
4026         if (!check_journal_end(th, flags)) {
4027                 reiserfs_schedule_old_flush(sb);
4028                 wake_queued_writers(sb);
4029                 reiserfs_async_progress_wait(sb);
4030                 goto out;
4031         }
4032
4033         /* check_journal_end might set these, check again */
4034         if (journal->j_next_full_flush) {
4035                 flush = 1;
4036         }
4037
4038         /*
4039          * j must wait means we have to flush the log blocks, and the
4040          * real blocks for this transaction
4041          */
4042         if (journal->j_must_wait > 0) {
4043                 flush = 1;
4044         }
4045 #ifdef REISERFS_PREALLOCATE
4046         /*
4047          * quota ops might need to nest, setup the journal_info pointer
4048          * for them and raise the refcount so that it is > 0.
4049          */
4050         current->journal_info = th;
4051         th->t_refcount++;
4052
4053         /* it should not involve new blocks into the transaction */
4054         reiserfs_discard_all_prealloc(th);
4055
4056         th->t_refcount--;
4057         current->journal_info = th->t_handle_save;
4058 #endif
4059
4060         /* setup description block */
4061         d_bh =
4062             journal_getblk(sb,
4063                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4064                            journal->j_start);
4065         set_buffer_uptodate(d_bh);
4066         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4067         memset(d_bh->b_data, 0, d_bh->b_size);
4068         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4069         set_desc_trans_id(desc, journal->j_trans_id);
4070
4071         /*
4072          * setup commit block.  Don't write (keep it clean too) this one
4073          * until after everyone else is written
4074          */
4075         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4076                               ((journal->j_start + journal->j_len +
4077                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4078         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4079         memset(c_bh->b_data, 0, c_bh->b_size);
4080         set_commit_trans_id(commit, journal->j_trans_id);
4081         set_buffer_uptodate(c_bh);
4082
4083         /* init this journal list */
4084         jl = journal->j_current_jl;
4085
4086         /*
4087          * we lock the commit before doing anything because
4088          * we want to make sure nobody tries to run flush_commit_list until
4089          * the new transaction is fully setup, and we've already flushed the
4090          * ordered bh list
4091          */
4092         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4093
4094         /* save the transaction id in case we need to commit it later */
4095         commit_trans_id = jl->j_trans_id;
4096
4097         atomic_set(&jl->j_older_commits_done, 0);
4098         jl->j_trans_id = journal->j_trans_id;
4099         jl->j_timestamp = journal->j_trans_start_time;
4100         jl->j_commit_bh = c_bh;
4101         jl->j_start = journal->j_start;
4102         jl->j_len = journal->j_len;
4103         atomic_set(&jl->j_nonzerolen, journal->j_len);
4104         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4105         jl->j_realblock = NULL;
4106
4107         /*
4108          * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4109          * for each real block, add it to the journal list hash,
4110          * copy into real block index array in the commit or desc block
4111          */
4112         trans_half = journal_trans_half(sb->s_blocksize);
4113         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4114                 if (buffer_journaled(cn->bh)) {
4115                         jl_cn = get_cnode(sb);
4116                         if (!jl_cn) {
4117                                 reiserfs_panic(sb, "journal-1676",
4118                                                "get_cnode returned NULL");
4119                         }
4120                         if (i == 0) {
4121                                 jl->j_realblock = jl_cn;
4122                         }
4123                         jl_cn->prev = last_cn;
4124                         jl_cn->next = NULL;
4125                         if (last_cn) {
4126                                 last_cn->next = jl_cn;
4127                         }
4128                         last_cn = jl_cn;
4129                         /*
4130                          * make sure the block we are trying to log
4131                          * is not a block of journal or reserved area
4132                          */
4133                         if (is_block_in_log_or_reserved_area
4134                             (sb, cn->bh->b_blocknr)) {
4135                                 reiserfs_panic(sb, "journal-2332",
4136                                                "Trying to log block %lu, "
4137                                                "which is a log block",
4138                                                cn->bh->b_blocknr);
4139                         }
4140                         jl_cn->blocknr = cn->bh->b_blocknr;
4141                         jl_cn->state = 0;
4142                         jl_cn->sb = sb;
4143                         jl_cn->bh = cn->bh;
4144                         jl_cn->jlist = jl;
4145                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4146                         if (i < trans_half) {
4147                                 desc->j_realblock[i] =
4148                                     cpu_to_le32(cn->bh->b_blocknr);
4149                         } else {
4150                                 commit->j_realblock[i - trans_half] =
4151                                     cpu_to_le32(cn->bh->b_blocknr);
4152                         }
4153                 } else {
4154                         i--;
4155                 }
4156         }
4157         set_desc_trans_len(desc, journal->j_len);
4158         set_desc_mount_id(desc, journal->j_mount_id);
4159         set_desc_trans_id(desc, journal->j_trans_id);
4160         set_commit_trans_len(commit, journal->j_len);
4161
4162         /*
4163          * special check in case all buffers in the journal
4164          * were marked for not logging
4165          */
4166         BUG_ON(journal->j_len == 0);
4167
4168         /*
4169          * we're about to dirty all the log blocks, mark the description block
4170          * dirty now too.  Don't mark the commit block dirty until all the
4171          * others are on disk
4172          */
4173         mark_buffer_dirty(d_bh);
4174
4175         /*
4176          * first data block is j_start + 1, so add one to
4177          * cur_write_start wherever you use it
4178          */
4179         cur_write_start = journal->j_start;
4180         cn = journal->j_first;
4181         jindex = 1;     /* start at one so we don't get the desc again */
4182         while (cn) {
4183                 clear_buffer_journal_new(cn->bh);
4184                 /* copy all the real blocks into log area.  dirty log blocks */
4185                 if (buffer_journaled(cn->bh)) {
4186                         struct buffer_head *tmp_bh;
4187                         char *addr;
4188                         struct page *page;
4189                         tmp_bh =
4190                             journal_getblk(sb,
4191                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4192                                            ((cur_write_start +
4193                                              jindex) %
4194                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4195                         set_buffer_uptodate(tmp_bh);
4196                         page = cn->bh->b_page;
4197                         addr = kmap(page);
4198                         memcpy(tmp_bh->b_data,
4199                                addr + offset_in_page(cn->bh->b_data),
4200                                cn->bh->b_size);
4201                         kunmap(page);
4202                         mark_buffer_dirty(tmp_bh);
4203                         jindex++;
4204                         set_buffer_journal_dirty(cn->bh);
4205                         clear_buffer_journaled(cn->bh);
4206                 } else {
4207                         /*
4208                          * JDirty cleared sometime during transaction.
4209                          * don't log this one
4210                          */
4211                         reiserfs_warning(sb, "journal-2048",
4212                                          "BAD, buffer in journal hash, "
4213                                          "but not JDirty!");
4214                         brelse(cn->bh);
4215                 }
4216                 next = cn->next;
4217                 free_cnode(sb, cn);
4218                 cn = next;
4219                 reiserfs_cond_resched(sb);
4220         }
4221
4222         /*
4223          * we are done with both the c_bh and d_bh, but
4224          * c_bh must be written after all other commit blocks,
4225          * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4226          */
4227
4228         journal->j_current_jl = alloc_journal_list(sb);
4229
4230         /* now it is safe to insert this transaction on the main list */
4231         list_add_tail(&jl->j_list, &journal->j_journal_list);
4232         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4233         journal->j_num_work_lists++;
4234
4235         /* reset journal values for the next transaction */
4236         journal->j_start =
4237             (journal->j_start + journal->j_len +
4238              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4239         atomic_set(&journal->j_wcount, 0);
4240         journal->j_bcount = 0;
4241         journal->j_last = NULL;
4242         journal->j_first = NULL;
4243         journal->j_len = 0;
4244         journal->j_trans_start_time = 0;
4245         /* check for trans_id overflow */
4246         if (++journal->j_trans_id == 0)
4247                 journal->j_trans_id = 10;
4248         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4249         journal->j_must_wait = 0;
4250         journal->j_len_alloc = 0;
4251         journal->j_next_full_flush = 0;
4252         journal->j_next_async_flush = 0;
4253         init_journal_hash(sb);
4254
4255         /*
4256          * make sure reiserfs_add_jh sees the new current_jl before we
4257          * write out the tails
4258          */
4259         smp_mb();
4260
4261         /*
4262          * tail conversion targets have to hit the disk before we end the
4263          * transaction.  Otherwise a later transaction might repack the tail
4264          * before this transaction commits, leaving the data block unflushed
4265          * and clean, if we crash before the later transaction commits, the
4266          * data block is lost.
4267          */
4268         if (!list_empty(&jl->j_tail_bh_list)) {
4269                 depth = reiserfs_write_unlock_nested(sb);
4270                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4271                                       journal, jl, &jl->j_tail_bh_list);
4272                 reiserfs_write_lock_nested(sb, depth);
4273         }
4274         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4275         mutex_unlock(&jl->j_commit_mutex);
4276
4277         /*
4278          * honor the flush wishes from the caller, simple commits can
4279          * be done outside the journal lock, they are done below
4280          *
4281          * if we don't flush the commit list right now, we put it into
4282          * the work queue so the people waiting on the async progress work
4283          * queue don't wait for this proc to flush journal lists and such.
4284          */
4285         if (flush) {
4286                 flush_commit_list(sb, jl, 1);
4287                 flush_journal_list(sb, jl, 1);
4288         } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4289                 /*
4290                  * Avoid queueing work when sb is being shut down. Transaction
4291                  * will be flushed on journal shutdown.
4292                  */
4293                 if (sb->s_flags & SB_ACTIVE)
4294                         queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4295                                            &journal->j_work, HZ / 10);
4296         }
4297
4298         /*
4299          * if the next transaction has any chance of wrapping, flush
4300          * transactions that might get overwritten.  If any journal lists
4301          * are very old flush them as well.
4302          */
4303 first_jl:
4304         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4305                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4306                 if (journal->j_start <= temp_jl->j_start) {
4307                         if ((journal->j_start + journal->j_trans_max + 1) >=
4308                             temp_jl->j_start) {
4309                                 flush_used_journal_lists(sb, temp_jl);
4310                                 goto first_jl;
4311                         } else if ((journal->j_start +
4312                                     journal->j_trans_max + 1) <
4313                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4314                                 /*
4315                                  * if we don't cross into the next
4316                                  * transaction and we don't wrap, there is
4317                                  * no way we can overlap any later transactions
4318                                  * break now
4319                                  */
4320                                 break;
4321                         }
4322                 } else if ((journal->j_start +
4323                             journal->j_trans_max + 1) >
4324                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4325                         if (((journal->j_start + journal->j_trans_max + 1) %
4326                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4327                             temp_jl->j_start) {
4328                                 flush_used_journal_lists(sb, temp_jl);
4329                                 goto first_jl;
4330                         } else {
4331                                 /*
4332                                 * we don't overlap anything from out start
4333                                 * to the end of the log, and our wrapped
4334                                 * portion doesn't overlap anything at
4335                                 * the start of the log.  We can break
4336                                 */
4337                                 break;
4338                         }
4339                 }
4340         }
4341
4342         journal->j_current_jl->j_list_bitmap =
4343             get_list_bitmap(sb, journal->j_current_jl);
4344
4345         if (!(journal->j_current_jl->j_list_bitmap)) {
4346                 reiserfs_panic(sb, "journal-1996",
4347                                "could not get a list bitmap");
4348         }
4349
4350         atomic_set(&journal->j_jlock, 0);
4351         unlock_journal(sb);
4352         /* wake up any body waiting to join. */
4353         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4354         wake_up(&journal->j_join_wait);
4355
4356         if (!flush && wait_on_commit &&
4357             journal_list_still_alive(sb, commit_trans_id)) {
4358                 flush_commit_list(sb, jl, 1);
4359         }
4360 out:
4361         reiserfs_check_lock_depth(sb, "journal end2");
4362
4363         memset(th, 0, sizeof(*th));
4364         /*
4365          * Re-set th->t_super, so we can properly keep track of how many
4366          * persistent transactions there are. We need to do this so if this
4367          * call is part of a failed restart_transaction, we can free it later
4368          */
4369         th->t_super = sb;
4370
4371         return journal->j_errno;
4372 }
4373
4374 /* Send the file system read only and refuse new transactions */
4375 void reiserfs_abort_journal(struct super_block *sb, int errno)
4376 {
4377         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4378         if (test_bit(J_ABORTED, &journal->j_state))
4379                 return;
4380
4381         if (!journal->j_errno)
4382                 journal->j_errno = errno;
4383
4384         sb->s_flags |= SB_RDONLY;
4385         set_bit(J_ABORTED, &journal->j_state);
4386
4387 #ifdef CONFIG_REISERFS_CHECK
4388         dump_stack();
4389 #endif
4390 }