fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/parser.h>
  23 #include <linux/completion.h>
  24 #include <linux/vfs.h>
  25 #include <linux/quotaops.h>
  26 #include <linux/mount.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kthread.h>
  29 #include <linux/posix_acl.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/crc32.h>
  33 #include <linux/slab.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/blkdev.h>
  37
  38 #include "jfs_incore.h"
  39 #include "jfs_filsys.h"
  40 #include "jfs_inode.h"
  41 #include "jfs_metapage.h"
  42 #include "jfs_superblock.h"
  43 #include "jfs_dmap.h"
  44 #include "jfs_imap.h"
  45 #include "jfs_acl.h"
  46 #include "jfs_debug.h"
  47 #include "jfs_xattr.h"
  48 #include "jfs_dinode.h"
  49
  50 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  51 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  52 MODULE_LICENSE("GPL");
  53
  54 static struct kmem_cache *jfs_inode_cachep;
  55
  56 static const struct super_operations jfs_super_operations;
  57 static const struct export_operations jfs_export_operations;
  58 static struct file_system_type jfs_fs_type;
  59
  60 #define MAX_COMMIT_THREADS 64
  61 static int commit_threads;
  62 module_param(commit_threads, int, 0);
  63 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  64
  65 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  66 struct task_struct *jfsIOthread;
  67 struct task_struct *jfsSyncThread;
  68
  69 #ifdef CONFIG_JFS_DEBUG
  70 int jfsloglevel = JFS_LOGLEVEL_WARN;
  71 module_param(jfsloglevel, int, 0644);
  72 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  73 #endif
  74
  75 static void jfs_handle_error(struct super_block *sb)
  76 {
  77         struct jfs_sb_info *sbi = JFS_SBI(sb);
  78
  79         if (sb_rdonly(sb))
  80                 return;
  81
  82         updateSuper(sb, FM_DIRTY);
  83
  84         if (sbi->flag & JFS_ERR_PANIC)
  85                 panic("JFS (device %s): panic forced after error\n",
  86                         sb->s_id);
  87         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  88                 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
  89                         sb->s_id);
  90                 sb->s_flags |= SB_RDONLY;
  91         }
  92
  93         /* nothing is done for continue beyond marking the superblock dirty */
  94 }
  95
  96 void jfs_error(struct super_block *sb, const char *fmt, ...)
  97 {
  98         struct va_format vaf;
  99         va_list args;
 100
 101         va_start(args, fmt);
 102
 103         vaf.fmt = fmt;
 104         vaf.va = &args;
 105
 106         pr_err("ERROR: (device %s): %ps: %pV\n",
 107                sb->s_id, __builtin_return_address(0), &vaf);
 108
 109         va_end(args);
 110
 111         jfs_handle_error(sb);
 112 }
 113
 114 static struct inode *jfs_alloc_inode(struct super_block *sb)
 115 {
 116         struct jfs_inode_info *jfs_inode;
 117
 118         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 119         if (!jfs_inode)
 120                 return NULL;
 121 #ifdef CONFIG_QUOTA
 122         memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
 123 #endif
 124         return &jfs_inode->vfs_inode;
 125 }
 126
 127 static void jfs_free_inode(struct inode *inode)
 128 {
 129         kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
 130 }
 131
 132 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 133 {
 134         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 135         s64 maxinodes;
 136         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 137
 138         jfs_info("In jfs_statfs");
 139         buf->f_type = JFS_SUPER_MAGIC;
 140         buf->f_bsize = sbi->bsize;
 141         buf->f_blocks = sbi->bmap->db_mapsize;
 142         buf->f_bfree = sbi->bmap->db_nfree;
 143         buf->f_bavail = sbi->bmap->db_nfree;
 144         /*
 145          * If we really return the number of allocated & free inodes, some
 146          * applications will fail because they won't see enough free inodes.
 147          * We'll try to calculate some guess as to how many inodes we can
 148          * really allocate
 149          *
 150          * buf->f_files = atomic_read(&imap->im_numinos);
 151          * buf->f_ffree = atomic_read(&imap->im_numfree);
 152          */
 153         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 154                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 155                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 156         buf->f_files = maxinodes;
 157         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 158                                     atomic_read(&imap->im_numfree));
 159         buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
 160                                       sizeof(sbi->uuid)/2);
 161         buf->f_fsid.val[1] = crc32_le(0,
 162                                       (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
 163                                       sizeof(sbi->uuid)/2);
 164
 165         buf->f_namelen = JFS_NAME_MAX;
 166         return 0;
 167 }
 168
 169 #ifdef CONFIG_QUOTA
 170 static int jfs_quota_off(struct super_block *sb, int type);
 171 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
 172                         const struct path *path);
 173
 174 static void jfs_quota_off_umount(struct super_block *sb)
 175 {
 176         int type;
 177
 178         for (type = 0; type < MAXQUOTAS; type++)
 179                 jfs_quota_off(sb, type);
 180 }
 181
 182 static const struct quotactl_ops jfs_quotactl_ops = {
 183         .quota_on       = jfs_quota_on,
 184         .quota_off      = jfs_quota_off,
 185         .quota_sync     = dquot_quota_sync,
 186         .get_state      = dquot_get_state,
 187         .set_info       = dquot_set_dqinfo,
 188         .get_dqblk      = dquot_get_dqblk,
 189         .set_dqblk      = dquot_set_dqblk,
 190         .get_nextdqblk  = dquot_get_next_dqblk,
 191 };
 192 #else
 193 static inline void jfs_quota_off_umount(struct super_block *sb)
 194 {
 195 }
 196 #endif
 197
 198 static void jfs_put_super(struct super_block *sb)
 199 {
 200         struct jfs_sb_info *sbi = JFS_SBI(sb);
 201         int rc;
 202
 203         jfs_info("In jfs_put_super");
 204
 205         jfs_quota_off_umount(sb);
 206
 207         rc = jfs_umount(sb);
 208         if (rc)
 209                 jfs_err("jfs_umount failed with return code %d", rc);
 210
 211         unload_nls(sbi->nls_tab);
 212
 213         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 214         iput(sbi->direct_inode);
 215
 216         kfree(sbi);
 217 }
 218
 219 enum {
 220         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 221         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 222         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
 223         Opt_discard, Opt_nodiscard, Opt_discard_minblk
 224 };
 225
 226 static const match_table_t tokens = {
 227         {Opt_integrity, "integrity"},
 228         {Opt_nointegrity, "nointegrity"},
 229         {Opt_iocharset, "iocharset=%s"},
 230         {Opt_resize, "resize=%u"},
 231         {Opt_resize_nosize, "resize"},
 232         {Opt_errors, "errors=%s"},
 233         {Opt_ignore, "noquota"},
 234         {Opt_quota, "quota"},
 235         {Opt_usrquota, "usrquota"},
 236         {Opt_grpquota, "grpquota"},
 237         {Opt_uid, "uid=%u"},
 238         {Opt_gid, "gid=%u"},
 239         {Opt_umask, "umask=%u"},
 240         {Opt_discard, "discard"},
 241         {Opt_nodiscard, "nodiscard"},
 242         {Opt_discard_minblk, "discard=%u"},
 243         {Opt_err, NULL}
 244 };
 245
 246 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 247                          int *flag)
 248 {
 249         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 250         char *p;
 251         struct jfs_sb_info *sbi = JFS_SBI(sb);
 252
 253         *newLVSize = 0;
 254
 255         if (!options)
 256                 return 1;
 257
 258         while ((p = strsep(&options, ",")) != NULL) {
 259                 substring_t args[MAX_OPT_ARGS];
 260                 int token;
 261                 if (!*p)
 262                         continue;
 263
 264                 token = match_token(p, tokens, args);
 265                 switch (token) {
 266                 case Opt_integrity:
 267                         *flag &= ~JFS_NOINTEGRITY;
 268                         break;
 269                 case Opt_nointegrity:
 270                         *flag |= JFS_NOINTEGRITY;
 271                         break;
 272                 case Opt_ignore:
 273                         /* Silently ignore the quota options */
 274                         /* Don't do anything ;-) */
 275                         break;
 276                 case Opt_iocharset:
 277                         if (nls_map && nls_map != (void *) -1)
 278                                 unload_nls(nls_map);
 279                         if (!strcmp(args[0].from, "none"))
 280                                 nls_map = NULL;
 281                         else {
 282                                 nls_map = load_nls(args[0].from);
 283                                 if (!nls_map) {
 284                                         pr_err("JFS: charset not found\n");
 285                                         goto cleanup;
 286                                 }
 287                         }
 288                         break;
 289                 case Opt_resize:
 290                 {
 291                         char *resize = args[0].from;
 292                         int rc = kstrtoll(resize, 0, newLVSize);
 293
 294                         if (rc)
 295                                 goto cleanup;
 296                         break;
 297                 }
 298                 case Opt_resize_nosize:
 299                 {
 300                         *newLVSize = i_size_read(sb->s_bdev->bd_inode) >>
 301                                 sb->s_blocksize_bits;
 302                         if (*newLVSize == 0)
 303                                 pr_err("JFS: Cannot determine volume size\n");
 304                         break;
 305                 }
 306                 case Opt_errors:
 307                 {
 308                         char *errors = args[0].from;
 309                         if (!errors || !*errors)
 310                                 goto cleanup;
 311                         if (!strcmp(errors, "continue")) {
 312                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 313                                 *flag &= ~JFS_ERR_PANIC;
 314                                 *flag |= JFS_ERR_CONTINUE;
 315                         } else if (!strcmp(errors, "remount-ro")) {
 316                                 *flag &= ~JFS_ERR_CONTINUE;
 317                                 *flag &= ~JFS_ERR_PANIC;
 318                                 *flag |= JFS_ERR_REMOUNT_RO;
 319                         } else if (!strcmp(errors, "panic")) {
 320                                 *flag &= ~JFS_ERR_CONTINUE;
 321                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 322                                 *flag |= JFS_ERR_PANIC;
 323                         } else {
 324                                 pr_err("JFS: %s is an invalid error handler\n",
 325                                        errors);
 326                                 goto cleanup;
 327                         }
 328                         break;
 329                 }
 330
 331 #ifdef CONFIG_QUOTA
 332                 case Opt_quota:
 333                 case Opt_usrquota:
 334                         *flag |= JFS_USRQUOTA;
 335                         break;
 336                 case Opt_grpquota:
 337                         *flag |= JFS_GRPQUOTA;
 338                         break;
 339 #else
 340                 case Opt_usrquota:
 341                 case Opt_grpquota:
 342                 case Opt_quota:
 343                         pr_err("JFS: quota operations not supported\n");
 344                         break;
 345 #endif
 346                 case Opt_uid:
 347                 {
 348                         char *uid = args[0].from;
 349                         uid_t val;
 350                         int rc = kstrtouint(uid, 0, &val);
 351
 352                         if (rc)
 353                                 goto cleanup;
 354                         sbi->uid = make_kuid(current_user_ns(), val);
 355                         if (!uid_valid(sbi->uid))
 356                                 goto cleanup;
 357                         break;
 358                 }
 359
 360                 case Opt_gid:
 361                 {
 362                         char *gid = args[0].from;
 363                         gid_t val;
 364                         int rc = kstrtouint(gid, 0, &val);
 365
 366                         if (rc)
 367                                 goto cleanup;
 368                         sbi->gid = make_kgid(current_user_ns(), val);
 369                         if (!gid_valid(sbi->gid))
 370                                 goto cleanup;
 371                         break;
 372                 }
 373
 374                 case Opt_umask:
 375                 {
 376                         char *umask = args[0].from;
 377                         int rc = kstrtouint(umask, 8, &sbi->umask);
 378
 379                         if (rc)
 380                                 goto cleanup;
 381                         if (sbi->umask & ~0777) {
 382                                 pr_err("JFS: Invalid value of umask\n");
 383                                 goto cleanup;
 384                         }
 385                         break;
 386                 }
 387
 388                 case Opt_discard:
 389                 {
 390                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 391                         /* if set to 1, even copying files will cause
 392                          * trimming :O
 393                          * -> user has more control over the online trimming
 394                          */
 395                         sbi->minblks_trim = 64;
 396                         if (blk_queue_discard(q))
 397                                 *flag |= JFS_DISCARD;
 398                         else
 399                                 pr_err("JFS: discard option not supported on device\n");
 400                         break;
 401                 }
 402
 403                 case Opt_nodiscard:
 404                         *flag &= ~JFS_DISCARD;
 405                         break;
 406
 407                 case Opt_discard_minblk:
 408                 {
 409                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 410                         char *minblks_trim = args[0].from;
 411                         int rc;
 412                         if (blk_queue_discard(q)) {
 413                                 *flag |= JFS_DISCARD;
 414                                 rc = kstrtouint(minblks_trim, 0,
 415                                                 &sbi->minblks_trim);
 416                                 if (rc)
 417                                         goto cleanup;
 418                         } else
 419                                 pr_err("JFS: discard option not supported on device\n");
 420                         break;
 421                 }
 422
 423                 default:
 424                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
 425                                p);
 426                         goto cleanup;
 427                 }
 428         }
 429
 430         if (nls_map != (void *) -1) {
 431                 /* Discard old (if remount) */
 432                 unload_nls(sbi->nls_tab);
 433                 sbi->nls_tab = nls_map;
 434         }
 435         return 1;
 436
 437 cleanup:
 438         if (nls_map && nls_map != (void *) -1)
 439                 unload_nls(nls_map);
 440         return 0;
 441 }
 442
 443 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 444 {
 445         s64 newLVSize = 0;
 446         int rc = 0;
 447         int flag = JFS_SBI(sb)->flag;
 448         int ret;
 449
 450         sync_filesystem(sb);
 451         if (!parse_options(data, sb, &newLVSize, &flag))
 452                 return -EINVAL;
 453
 454         if (newLVSize) {
 455                 if (sb_rdonly(sb)) {
 456                         pr_err("JFS: resize requires volume to be mounted read-write\n");
 457                         return -EROFS;
 458                 }
 459                 rc = jfs_extendfs(sb, newLVSize, 0);
 460                 if (rc)
 461                         return rc;
 462         }
 463
 464         if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
 465                 /*
 466                  * Invalidate any previously read metadata.  fsck may have
 467                  * changed the on-disk data since we mounted r/o
 468                  */
 469                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 470
 471                 JFS_SBI(sb)->flag = flag;
 472                 ret = jfs_mount_rw(sb, 1);
 473
 474                 /* mark the fs r/w for quota activity */
 475                 sb->s_flags &= ~SB_RDONLY;
 476
 477                 dquot_resume(sb, -1);
 478                 return ret;
 479         }
 480         if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
 481                 rc = dquot_suspend(sb, -1);
 482                 if (rc < 0)
 483                         return rc;
 484                 rc = jfs_umount_rw(sb);
 485                 JFS_SBI(sb)->flag = flag;
 486                 return rc;
 487         }
 488         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 489                 if (!sb_rdonly(sb)) {
 490                         rc = jfs_umount_rw(sb);
 491                         if (rc)
 492                                 return rc;
 493
 494                         JFS_SBI(sb)->flag = flag;
 495                         ret = jfs_mount_rw(sb, 1);
 496                         return ret;
 497                 }
 498         JFS_SBI(sb)->flag = flag;
 499
 500         return 0;
 501 }
 502
 503 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 504 {
 505         struct jfs_sb_info *sbi;
 506         struct inode *inode;
 507         int rc;
 508         s64 newLVSize = 0;
 509         int flag, ret = -EINVAL;
 510
 511         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 512
 513         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
 514         if (!sbi)
 515                 return -ENOMEM;
 516
 517         sb->s_fs_info = sbi;
 518         sb->s_max_links = JFS_LINK_MAX;
 519         sbi->sb = sb;
 520         sbi->uid = INVALID_UID;
 521         sbi->gid = INVALID_GID;
 522         sbi->umask = -1;
 523
 524         /* initialize the mount flag and determine the default error handler */
 525         flag = JFS_ERR_REMOUNT_RO;
 526
 527         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 528                 goto out_kfree;
 529         sbi->flag = flag;
 530
 531 #ifdef CONFIG_JFS_POSIX_ACL
 532         sb->s_flags |= SB_POSIXACL;
 533 #endif
 534
 535         if (newLVSize) {
 536                 pr_err("resize option for remount only\n");
 537                 goto out_kfree;
 538         }
 539
 540         /*
 541          * Initialize blocksize to 4K.
 542          */
 543         sb_set_blocksize(sb, PSIZE);
 544
 545         /*
 546          * Set method vectors.
 547          */
 548         sb->s_op = &jfs_super_operations;
 549         sb->s_export_op = &jfs_export_operations;
 550         sb->s_xattr = jfs_xattr_handlers;
 551 #ifdef CONFIG_QUOTA
 552         sb->dq_op = &dquot_operations;
 553         sb->s_qcop = &jfs_quotactl_ops;
 554         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 555 #endif
 556
 557         /*
 558          * Initialize direct-mapping inode/address-space
 559          */
 560         inode = new_inode(sb);
 561         if (inode == NULL) {
 562                 ret = -ENOMEM;
 563                 goto out_unload;
 564         }
 565         inode->i_ino = 0;
 566         inode->i_size = i_size_read(sb->s_bdev->bd_inode);
 567         inode->i_mapping->a_ops = &jfs_metapage_aops;
 568         inode_fake_hash(inode);
 569         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 570
 571         sbi->direct_inode = inode;
 572
 573         rc = jfs_mount(sb);
 574         if (rc) {
 575                 if (!silent)
 576                         jfs_err("jfs_mount failed w/return code = %d", rc);
 577                 goto out_mount_failed;
 578         }
 579         if (sb_rdonly(sb))
 580                 sbi->log = NULL;
 581         else {
 582                 rc = jfs_mount_rw(sb, 0);
 583                 if (rc) {
 584                         if (!silent) {
 585                                 jfs_err("jfs_mount_rw failed, return code = %d",
 586                                         rc);
 587                         }
 588                         goto out_no_rw;
 589                 }
 590         }
 591
 592         sb->s_magic = JFS_SUPER_MAGIC;
 593
 594         if (sbi->mntflag & JFS_OS2)
 595                 sb->s_d_op = &jfs_ci_dentry_operations;
 596
 597         inode = jfs_iget(sb, ROOT_I);
 598         if (IS_ERR(inode)) {
 599                 ret = PTR_ERR(inode);
 600                 goto out_no_rw;
 601         }
 602         sb->s_root = d_make_root(inode);
 603         if (!sb->s_root)
 604                 goto out_no_root;
 605
 606         /* logical blocks are represented by 40 bits in pxd_t, etc.
 607          * and page cache is indexed by long
 608          */
 609         sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
 610         sb->s_time_gran = 1;
 611         return 0;
 612
 613 out_no_root:
 614         jfs_err("jfs_read_super: get root dentry failed");
 615
 616 out_no_rw:
 617         rc = jfs_umount(sb);
 618         if (rc)
 619                 jfs_err("jfs_umount failed with return code %d", rc);
 620 out_mount_failed:
 621         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 622         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 623         make_bad_inode(sbi->direct_inode);
 624         iput(sbi->direct_inode);
 625         sbi->direct_inode = NULL;
 626 out_unload:
 627         unload_nls(sbi->nls_tab);
 628 out_kfree:
 629         kfree(sbi);
 630         return ret;
 631 }
 632
 633 static int jfs_freeze(struct super_block *sb)
 634 {
 635         struct jfs_sb_info *sbi = JFS_SBI(sb);
 636         struct jfs_log *log = sbi->log;
 637         int rc = 0;
 638
 639         if (!sb_rdonly(sb)) {
 640                 txQuiesce(sb);
 641                 rc = lmLogShutdown(log);
 642                 if (rc) {
 643                         jfs_error(sb, "lmLogShutdown failed\n");
 644
 645                         /* let operations fail rather than hang */
 646                         txResume(sb);
 647
 648                         return rc;
 649                 }
 650                 rc = updateSuper(sb, FM_CLEAN);
 651                 if (rc) {
 652                         jfs_err("jfs_freeze: updateSuper failed");
 653                         /*
 654                          * Don't fail here. Everything succeeded except
 655                          * marking the superblock clean, so there's really
 656                          * no harm in leaving it frozen for now.
 657                          */
 658                 }
 659         }
 660         return 0;
 661 }
 662
 663 static int jfs_unfreeze(struct super_block *sb)
 664 {
 665         struct jfs_sb_info *sbi = JFS_SBI(sb);
 666         struct jfs_log *log = sbi->log;
 667         int rc = 0;
 668
 669         if (!sb_rdonly(sb)) {
 670                 rc = updateSuper(sb, FM_MOUNT);
 671                 if (rc) {
 672                         jfs_error(sb, "updateSuper failed\n");
 673                         goto out;
 674                 }
 675                 rc = lmLogInit(log);
 676                 if (rc)
 677                         jfs_error(sb, "lmLogInit failed\n");
 678 out:
 679                 txResume(sb);
 680         }
 681         return rc;
 682 }
 683
 684 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 685         int flags, const char *dev_name, void *data)
 686 {
 687         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 688 }
 689
 690 static int jfs_sync_fs(struct super_block *sb, int wait)
 691 {
 692         struct jfs_log *log = JFS_SBI(sb)->log;
 693
 694         /* log == NULL indicates read-only mount */
 695         if (log) {
 696                 /*
 697                  * Write quota structures to quota file, sync_blockdev() will
 698                  * write them to disk later
 699                  */
 700                 dquot_writeback_dquots(sb, -1);
 701                 jfs_flush_journal(log, wait);
 702                 jfs_syncpt(log, 0);
 703         }
 704
 705         return 0;
 706 }
 707
 708 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 709 {
 710         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 711
 712         if (uid_valid(sbi->uid))
 713                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 714         if (gid_valid(sbi->gid))
 715                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 716         if (sbi->umask != -1)
 717                 seq_printf(seq, ",umask=%03o", sbi->umask);
 718         if (sbi->flag & JFS_NOINTEGRITY)
 719                 seq_puts(seq, ",nointegrity");
 720         if (sbi->flag & JFS_DISCARD)
 721                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 722         if (sbi->nls_tab)
 723                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 724         if (sbi->flag & JFS_ERR_CONTINUE)
 725                 seq_printf(seq, ",errors=continue");
 726         if (sbi->flag & JFS_ERR_PANIC)
 727                 seq_printf(seq, ",errors=panic");
 728
 729 #ifdef CONFIG_QUOTA
 730         if (sbi->flag & JFS_USRQUOTA)
 731                 seq_puts(seq, ",usrquota");
 732
 733         if (sbi->flag & JFS_GRPQUOTA)
 734                 seq_puts(seq, ",grpquota");
 735 #endif
 736
 737         return 0;
 738 }
 739
 740 #ifdef CONFIG_QUOTA
 741
 742 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 743  * acquiring the locks... As quota files are never truncated and quota code
 744  * itself serializes the operations (and no one else should touch the files)
 745  * we don't have to be afraid of races */
 746 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 747                               size_t len, loff_t off)
 748 {
 749         struct inode *inode = sb_dqopt(sb)->files[type];
 750         sector_t blk = off >> sb->s_blocksize_bits;
 751         int err = 0;
 752         int offset = off & (sb->s_blocksize - 1);
 753         int tocopy;
 754         size_t toread;
 755         struct buffer_head tmp_bh;
 756         struct buffer_head *bh;
 757         loff_t i_size = i_size_read(inode);
 758
 759         if (off > i_size)
 760                 return 0;
 761         if (off+len > i_size)
 762                 len = i_size-off;
 763         toread = len;
 764         while (toread > 0) {
 765                 tocopy = sb->s_blocksize - offset < toread ?
 766                                 sb->s_blocksize - offset : toread;
 767
 768                 tmp_bh.b_state = 0;
 769                 tmp_bh.b_size = i_blocksize(inode);
 770                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 771                 if (err)
 772                         return err;
 773                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 774                         memset(data, 0, tocopy);
 775                 else {
 776                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 777                         if (!bh)
 778                                 return -EIO;
 779                         memcpy(data, bh->b_data+offset, tocopy);
 780                         brelse(bh);
 781                 }
 782                 offset = 0;
 783                 toread -= tocopy;
 784                 data += tocopy;
 785                 blk++;
 786         }
 787         return len;
 788 }
 789
 790 /* Write to quotafile */
 791 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 792                                const char *data, size_t len, loff_t off)
 793 {
 794         struct inode *inode = sb_dqopt(sb)->files[type];
 795         sector_t blk = off >> sb->s_blocksize_bits;
 796         int err = 0;
 797         int offset = off & (sb->s_blocksize - 1);
 798         int tocopy;
 799         size_t towrite = len;
 800         struct buffer_head tmp_bh;
 801         struct buffer_head *bh;
 802
 803         inode_lock(inode);
 804         while (towrite > 0) {
 805                 tocopy = sb->s_blocksize - offset < towrite ?
 806                                 sb->s_blocksize - offset : towrite;
 807
 808                 tmp_bh.b_state = 0;
 809                 tmp_bh.b_size = i_blocksize(inode);
 810                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 811                 if (err)
 812                         goto out;
 813                 if (offset || tocopy != sb->s_blocksize)
 814                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 815                 else
 816                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 817                 if (!bh) {
 818                         err = -EIO;
 819                         goto out;
 820                 }
 821                 lock_buffer(bh);
 822                 memcpy(bh->b_data+offset, data, tocopy);
 823                 flush_dcache_page(bh->b_page);
 824                 set_buffer_uptodate(bh);
 825                 mark_buffer_dirty(bh);
 826                 unlock_buffer(bh);
 827                 brelse(bh);
 828                 offset = 0;
 829                 towrite -= tocopy;
 830                 data += tocopy;
 831                 blk++;
 832         }
 833 out:
 834         if (len == towrite) {
 835                 inode_unlock(inode);
 836                 return err;
 837         }
 838         if (inode->i_size < off+len-towrite)
 839                 i_size_write(inode, off+len-towrite);
 840         inode->i_mtime = inode->i_ctime = current_time(inode);
 841         mark_inode_dirty(inode);
 842         inode_unlock(inode);
 843         return len - towrite;
 844 }
 845
 846 static struct dquot **jfs_get_dquots(struct inode *inode)
 847 {
 848         return JFS_IP(inode)->i_dquot;
 849 }
 850
 851 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
 852                         const struct path *path)
 853 {
 854         int err;
 855         struct inode *inode;
 856
 857         err = dquot_quota_on(sb, type, format_id, path);
 858         if (err)
 859                 return err;
 860
 861         inode = d_inode(path->dentry);
 862         inode_lock(inode);
 863         JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
 864         inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
 865                         S_NOATIME | S_IMMUTABLE);
 866         inode_unlock(inode);
 867         mark_inode_dirty(inode);
 868
 869         return 0;
 870 }
 871
 872 static int jfs_quota_off(struct super_block *sb, int type)
 873 {
 874         struct inode *inode = sb_dqopt(sb)->files[type];
 875         int err;
 876
 877         if (!inode || !igrab(inode))
 878                 goto out;
 879
 880         err = dquot_quota_off(sb, type);
 881         if (err)
 882                 goto out_put;
 883
 884         inode_lock(inode);
 885         JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
 886         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
 887         inode_unlock(inode);
 888         mark_inode_dirty(inode);
 889 out_put:
 890         iput(inode);
 891         return err;
 892 out:
 893         return dquot_quota_off(sb, type);
 894 }
 895 #endif
 896
 897 static const struct super_operations jfs_super_operations = {
 898         .alloc_inode    = jfs_alloc_inode,
 899         .free_inode     = jfs_free_inode,
 900         .dirty_inode    = jfs_dirty_inode,
 901         .write_inode    = jfs_write_inode,
 902         .evict_inode    = jfs_evict_inode,
 903         .put_super      = jfs_put_super,
 904         .sync_fs        = jfs_sync_fs,
 905         .freeze_fs      = jfs_freeze,
 906         .unfreeze_fs    = jfs_unfreeze,
 907         .statfs         = jfs_statfs,
 908         .remount_fs     = jfs_remount,
 909         .show_options   = jfs_show_options,
 910 #ifdef CONFIG_QUOTA
 911         .quota_read     = jfs_quota_read,
 912         .quota_write    = jfs_quota_write,
 913         .get_dquots     = jfs_get_dquots,
 914 #endif
 915 };
 916
 917 static const struct export_operations jfs_export_operations = {
 918         .fh_to_dentry   = jfs_fh_to_dentry,
 919         .fh_to_parent   = jfs_fh_to_parent,
 920         .get_parent     = jfs_get_parent,
 921 };
 922
 923 static struct file_system_type jfs_fs_type = {
 924         .owner          = THIS_MODULE,
 925         .name           = "jfs",
 926         .mount          = jfs_do_mount,
 927         .kill_sb        = kill_block_super,
 928         .fs_flags       = FS_REQUIRES_DEV,
 929 };
 930 MODULE_ALIAS_FS("jfs");
 931
 932 static void init_once(void *foo)
 933 {
 934         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 935
 936         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 937         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 938         init_rwsem(&jfs_ip->rdwrlock);
 939         mutex_init(&jfs_ip->commit_mutex);
 940         init_rwsem(&jfs_ip->xattr_sem);
 941         spin_lock_init(&jfs_ip->ag_lock);
 942         jfs_ip->active_ag = -1;
 943         inode_init_once(&jfs_ip->vfs_inode);
 944 }
 945
 946 static int __init init_jfs_fs(void)
 947 {
 948         int i;
 949         int rc;
 950
 951         jfs_inode_cachep =
 952             kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
 953                         0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
 954                         offsetof(struct jfs_inode_info, i_inline), IDATASIZE,
 955                         init_once);
 956         if (jfs_inode_cachep == NULL)
 957                 return -ENOMEM;
 958
 959         /*
 960          * Metapage initialization
 961          */
 962         rc = metapage_init();
 963         if (rc) {
 964                 jfs_err("metapage_init failed w/rc = %d", rc);
 965                 goto free_slab;
 966         }
 967
 968         /*
 969          * Transaction Manager initialization
 970          */
 971         rc = txInit();
 972         if (rc) {
 973                 jfs_err("txInit failed w/rc = %d", rc);
 974                 goto free_metapage;
 975         }
 976
 977         /*
 978          * I/O completion thread (endio)
 979          */
 980         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 981         if (IS_ERR(jfsIOthread)) {
 982                 rc = PTR_ERR(jfsIOthread);
 983                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 984                 goto end_txmngr;
 985         }
 986
 987         if (commit_threads < 1)
 988                 commit_threads = num_online_cpus();
 989         if (commit_threads > MAX_COMMIT_THREADS)
 990                 commit_threads = MAX_COMMIT_THREADS;
 991
 992         for (i = 0; i < commit_threads; i++) {
 993                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
 994                                                  "jfsCommit");
 995                 if (IS_ERR(jfsCommitThread[i])) {
 996                         rc = PTR_ERR(jfsCommitThread[i]);
 997                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 998                         commit_threads = i;
 999                         goto kill_committask;
1000                 }
1001         }
1002
1003         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
1004         if (IS_ERR(jfsSyncThread)) {
1005                 rc = PTR_ERR(jfsSyncThread);
1006                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
1007                 goto kill_committask;
1008         }
1009
1010 #ifdef PROC_FS_JFS
1011         jfs_proc_init();
1012 #endif
1013
1014         rc = register_filesystem(&jfs_fs_type);
1015         if (!rc)
1016                 return 0;
1017
1018 #ifdef PROC_FS_JFS
1019         jfs_proc_clean();
1020 #endif
1021         kthread_stop(jfsSyncThread);
1022 kill_committask:
1023         for (i = 0; i < commit_threads; i++)
1024                 kthread_stop(jfsCommitThread[i]);
1025         kthread_stop(jfsIOthread);
1026 end_txmngr:
1027         txExit();
1028 free_metapage:
1029         metapage_exit();
1030 free_slab:
1031         kmem_cache_destroy(jfs_inode_cachep);
1032         return rc;
1033 }
1034
1035 static void __exit exit_jfs_fs(void)
1036 {
1037         int i;
1038
1039         jfs_info("exit_jfs_fs called");
1040
1041         txExit();
1042         metapage_exit();
1043
1044         kthread_stop(jfsIOthread);
1045         for (i = 0; i < commit_threads; i++)
1046                 kthread_stop(jfsCommitThread[i]);
1047         kthread_stop(jfsSyncThread);
1048 #ifdef PROC_FS_JFS
1049         jfs_proc_clean();
1050 #endif
1051         unregister_filesystem(&jfs_fs_type);
1052
1053         /*
1054          * Make sure all delayed rcu free inodes are flushed before we
1055          * destroy cache.
1056          */
1057         rcu_barrier();
1058         kmem_cache_destroy(jfs_inode_cachep);
1059 }
1060
1061 module_init(init_jfs_fs)
1062 module_exit(exit_jfs_fs)