fs/ocfs2/namei.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * namei.c
   6  *
   7  * Create and rename file, directory, symlinks
   8  *
   9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  10  *
  11  *  Portions of this code from linux/fs/ext3/dir.c
  12  *
  13  *  Copyright (C) 1992, 1993, 1994, 1995
  14  *  Remy Card (card@masi.ibp.fr)
  15  *  Laboratoire MASI - Institut Blaise pascal
  16  *  Universite Pierre et Marie Curie (Paris VI)
  17  *
  18  *   from
  19  *
  20  *   linux/fs/minix/dir.c
  21  *
  22  *   Copyright (C) 1991, 1992 Linux Torvalds
  23  */
  24
  25 #include <linux/fs.h>
  26 #include <linux/types.h>
  27 #include <linux/slab.h>
  28 #include <linux/highmem.h>
  29 #include <linux/quotaops.h>
  30 #include <linux/iversion.h>
  31
  32 #include <cluster/masklog.h>
  33
  34 #include "ocfs2.h"
  35
  36 #include "alloc.h"
  37 #include "dcache.h"
  38 #include "dir.h"
  39 #include "dlmglue.h"
  40 #include "extent_map.h"
  41 #include "file.h"
  42 #include "inode.h"
  43 #include "journal.h"
  44 #include "namei.h"
  45 #include "suballoc.h"
  46 #include "super.h"
  47 #include "symlink.h"
  48 #include "sysfile.h"
  49 #include "uptodate.h"
  50 #include "xattr.h"
  51 #include "acl.h"
  52 #include "ocfs2_trace.h"
  53
  54 #include "buffer_head_io.h"
  55
  56 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
  57                               struct inode *dir,
  58                               struct inode *inode,
  59                               dev_t dev,
  60                               struct buffer_head **new_fe_bh,
  61                               struct buffer_head *parent_fe_bh,
  62                               handle_t *handle,
  63                               struct ocfs2_alloc_context *inode_ac);
  64
  65 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
  66                                     struct inode **ret_orphan_dir,
  67                                     u64 blkno,
  68                                     char *name,
  69                                     struct ocfs2_dir_lookup_result *lookup,
  70                                     bool dio);
  71
  72 static int ocfs2_orphan_add(struct ocfs2_super *osb,
  73                             handle_t *handle,
  74                             struct inode *inode,
  75                             struct buffer_head *fe_bh,
  76                             char *name,
  77                             struct ocfs2_dir_lookup_result *lookup,
  78                             struct inode *orphan_dir_inode,
  79                             bool dio);
  80
  81 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
  82                                      handle_t *handle,
  83                                      struct inode *inode,
  84                                      const char *symname);
  85
  86 static int ocfs2_double_lock(struct ocfs2_super *osb,
  87                              struct buffer_head **bh1,
  88                              struct inode *inode1,
  89                              struct buffer_head **bh2,
  90                              struct inode *inode2,
  91                              int rename);
  92
  93 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2);
  94 /* An orphan dir name is an 8 byte value, printed as a hex string */
  95 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
  96
  97 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
  98                                    unsigned int flags)
  99 {
 100         int status;
 101         u64 blkno;
 102         struct inode *inode = NULL;
 103         struct dentry *ret;
 104         struct ocfs2_inode_info *oi;
 105
 106         trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
 107                            dentry->d_name.name,
 108                            (unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
 109
 110         if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
 111                 ret = ERR_PTR(-ENAMETOOLONG);
 112                 goto bail;
 113         }
 114
 115         status = ocfs2_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
 116         if (status < 0) {
 117                 if (status != -ENOENT)
 118                         mlog_errno(status);
 119                 ret = ERR_PTR(status);
 120                 goto bail;
 121         }
 122
 123         status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
 124                                             dentry->d_name.len, &blkno);
 125         if (status < 0)
 126                 goto bail_add;
 127
 128         inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
 129         if (IS_ERR(inode)) {
 130                 ret = ERR_PTR(-EACCES);
 131                 goto bail_unlock;
 132         }
 133
 134         oi = OCFS2_I(inode);
 135         /* Clear any orphaned state... If we were able to look up the
 136          * inode from a directory, it certainly can't be orphaned. We
 137          * might have the bad state from a node which intended to
 138          * orphan this inode but crashed before it could commit the
 139          * unlink. */
 140         spin_lock(&oi->ip_lock);
 141         oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
 142         spin_unlock(&oi->ip_lock);
 143
 144 bail_add:
 145         ret = d_splice_alias(inode, dentry);
 146
 147         if (inode) {
 148                 /*
 149                  * If d_splice_alias() finds a DCACHE_DISCONNECTED
 150                  * dentry, it will d_move() it on top of ourse. The
 151                  * return value will indicate this however, so in
 152                  * those cases, we switch them around for the locking
 153                  * code.
 154                  *
 155                  * NOTE: This dentry already has ->d_op set from
 156                  * ocfs2_get_parent() and ocfs2_get_dentry()
 157                  */
 158                 if (!IS_ERR_OR_NULL(ret))
 159                         dentry = ret;
 160
 161                 status = ocfs2_dentry_attach_lock(dentry, inode,
 162                                                   OCFS2_I(dir)->ip_blkno);
 163                 if (status) {
 164                         mlog_errno(status);
 165                         ret = ERR_PTR(status);
 166                         goto bail_unlock;
 167                 }
 168         } else
 169                 ocfs2_dentry_attach_gen(dentry);
 170
 171 bail_unlock:
 172         /* Don't drop the cluster lock until *after* the d_add --
 173          * unlink on another node will message us to remove that
 174          * dentry under this lock so otherwise we can race this with
 175          * the downconvert thread and have a stale dentry. */
 176         ocfs2_inode_unlock(dir, 0);
 177
 178 bail:
 179
 180         trace_ocfs2_lookup_ret(ret);
 181
 182         return ret;
 183 }
 184
 185 static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
 186 {
 187         struct inode *inode;
 188         int status;
 189
 190         inode = new_inode(dir->i_sb);
 191         if (!inode) {
 192                 mlog(ML_ERROR, "new_inode failed!\n");
 193                 return ERR_PTR(-ENOMEM);
 194         }
 195
 196         /* populate as many fields early on as possible - many of
 197          * these are used by the support functions here and in
 198          * callers. */
 199         if (S_ISDIR(mode))
 200                 set_nlink(inode, 2);
 201         inode_init_owner(&init_user_ns, inode, dir, mode);
 202         status = dquot_initialize(inode);
 203         if (status)
 204                 return ERR_PTR(status);
 205
 206         return inode;
 207 }
 208
 209 static void ocfs2_cleanup_add_entry_failure(struct ocfs2_super *osb,
 210                 struct dentry *dentry, struct inode *inode)
 211 {
 212         struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
 213
 214         ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
 215         ocfs2_lock_res_free(&dl->dl_lockres);
 216         BUG_ON(dl->dl_count != 1);
 217         spin_lock(&dentry_attach_lock);
 218         dentry->d_fsdata = NULL;
 219         spin_unlock(&dentry_attach_lock);
 220         kfree(dl);
 221         iput(inode);
 222 }
 223
 224 static int ocfs2_mknod(struct user_namespace *mnt_userns,
 225                        struct inode *dir,
 226                        struct dentry *dentry,
 227                        umode_t mode,
 228                        dev_t dev)
 229 {
 230         int status = 0;
 231         struct buffer_head *parent_fe_bh = NULL;
 232         handle_t *handle = NULL;
 233         struct ocfs2_super *osb;
 234         struct ocfs2_dinode *dirfe;
 235         struct buffer_head *new_fe_bh = NULL;
 236         struct inode *inode = NULL;
 237         struct ocfs2_alloc_context *inode_ac = NULL;
 238         struct ocfs2_alloc_context *data_ac = NULL;
 239         struct ocfs2_alloc_context *meta_ac = NULL;
 240         int want_clusters = 0;
 241         int want_meta = 0;
 242         int xattr_credits = 0;
 243         struct ocfs2_security_xattr_info si = {
 244                 .enable = 1,
 245         };
 246         int did_quota_inode = 0;
 247         struct ocfs2_dir_lookup_result lookup = { NULL, };
 248         sigset_t oldset;
 249         int did_block_signals = 0;
 250         struct ocfs2_dentry_lock *dl = NULL;
 251
 252         trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 253                           (unsigned long long)OCFS2_I(dir)->ip_blkno,
 254                           (unsigned long)dev, mode);
 255
 256         status = dquot_initialize(dir);
 257         if (status) {
 258                 mlog_errno(status);
 259                 return status;
 260         }
 261
 262         /* get our super block */
 263         osb = OCFS2_SB(dir->i_sb);
 264
 265         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
 266         if (status < 0) {
 267                 if (status != -ENOENT)
 268                         mlog_errno(status);
 269                 return status;
 270         }
 271
 272         if (S_ISDIR(mode) && (dir->i_nlink >= ocfs2_link_max(osb))) {
 273                 status = -EMLINK;
 274                 goto leave;
 275         }
 276
 277         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
 278         if (!ocfs2_read_links_count(dirfe)) {
 279                 /* can't make a file in a deleted directory. */
 280                 status = -ENOENT;
 281                 goto leave;
 282         }
 283
 284         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 285                                            dentry->d_name.len);
 286         if (status)
 287                 goto leave;
 288
 289         /* get a spot inside the dir. */
 290         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 291                                               dentry->d_name.name,
 292                                               dentry->d_name.len, &lookup);
 293         if (status < 0) {
 294                 mlog_errno(status);
 295                 goto leave;
 296         }
 297
 298         /* reserve an inode spot */
 299         status = ocfs2_reserve_new_inode(osb, &inode_ac);
 300         if (status < 0) {
 301                 if (status != -ENOSPC)
 302                         mlog_errno(status);
 303                 goto leave;
 304         }
 305
 306         inode = ocfs2_get_init_inode(dir, mode);
 307         if (IS_ERR(inode)) {
 308                 status = PTR_ERR(inode);
 309                 inode = NULL;
 310                 mlog_errno(status);
 311                 goto leave;
 312         }
 313
 314         /* get security xattr */
 315         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
 316         if (status) {
 317                 if (status == -EOPNOTSUPP)
 318                         si.enable = 0;
 319                 else {
 320                         mlog_errno(status);
 321                         goto leave;
 322                 }
 323         }
 324
 325         /* calculate meta data/clusters for setting security and acl xattr */
 326         status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
 327                                        &si, &want_clusters,
 328                                        &xattr_credits, &want_meta);
 329         if (status < 0) {
 330                 mlog_errno(status);
 331                 goto leave;
 332         }
 333
 334         /* Reserve a cluster if creating an extent based directory. */
 335         if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
 336                 want_clusters += 1;
 337
 338                 /* Dir indexing requires extra space as well */
 339                 if (ocfs2_supports_indexed_dirs(osb))
 340                         want_meta++;
 341         }
 342
 343         status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
 344         if (status < 0) {
 345                 if (status != -ENOSPC)
 346                         mlog_errno(status);
 347                 goto leave;
 348         }
 349
 350         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
 351         if (status < 0) {
 352                 if (status != -ENOSPC)
 353                         mlog_errno(status);
 354                 goto leave;
 355         }
 356
 357         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
 358                                                             S_ISDIR(mode),
 359                                                             xattr_credits));
 360         if (IS_ERR(handle)) {
 361                 status = PTR_ERR(handle);
 362                 handle = NULL;
 363                 mlog_errno(status);
 364                 goto leave;
 365         }
 366
 367         /* Starting to change things, restart is no longer possible. */
 368         ocfs2_block_signals(&oldset);
 369         did_block_signals = 1;
 370
 371         status = dquot_alloc_inode(inode);
 372         if (status)
 373                 goto leave;
 374         did_quota_inode = 1;
 375
 376         /* do the real work now. */
 377         status = ocfs2_mknod_locked(osb, dir, inode, dev,
 378                                     &new_fe_bh, parent_fe_bh, handle,
 379                                     inode_ac);
 380         if (status < 0) {
 381                 mlog_errno(status);
 382                 goto leave;
 383         }
 384
 385         if (S_ISDIR(mode)) {
 386                 status = ocfs2_fill_new_dir(osb, handle, dir, inode,
 387                                             new_fe_bh, data_ac, meta_ac);
 388                 if (status < 0) {
 389                         mlog_errno(status);
 390                         goto leave;
 391                 }
 392
 393                 status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
 394                                                  parent_fe_bh,
 395                                                  OCFS2_JOURNAL_ACCESS_WRITE);
 396                 if (status < 0) {
 397                         mlog_errno(status);
 398                         goto leave;
 399                 }
 400                 ocfs2_add_links_count(dirfe, 1);
 401                 ocfs2_journal_dirty(handle, parent_fe_bh);
 402                 inc_nlink(dir);
 403         }
 404
 405         status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
 406                          meta_ac, data_ac);
 407
 408         if (status < 0) {
 409                 mlog_errno(status);
 410                 goto roll_back;
 411         }
 412
 413         if (si.enable) {
 414                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
 415                                                  meta_ac, data_ac);
 416                 if (status < 0) {
 417                         mlog_errno(status);
 418                         goto roll_back;
 419                 }
 420         }
 421
 422         /*
 423          * Do this before adding the entry to the directory. We add
 424          * also set d_op after success so that ->d_iput() will cleanup
 425          * the dentry lock even if ocfs2_add_entry() fails below.
 426          */
 427         status = ocfs2_dentry_attach_lock(dentry, inode,
 428                                           OCFS2_I(dir)->ip_blkno);
 429         if (status) {
 430                 mlog_errno(status);
 431                 goto roll_back;
 432         }
 433
 434         dl = dentry->d_fsdata;
 435
 436         status = ocfs2_add_entry(handle, dentry, inode,
 437                                  OCFS2_I(inode)->ip_blkno, parent_fe_bh,
 438                                  &lookup);
 439         if (status < 0) {
 440                 mlog_errno(status);
 441                 goto roll_back;
 442         }
 443
 444         insert_inode_hash(inode);
 445         d_instantiate(dentry, inode);
 446         status = 0;
 447
 448 roll_back:
 449         if (status < 0 && S_ISDIR(mode)) {
 450                 ocfs2_add_links_count(dirfe, -1);
 451                 drop_nlink(dir);
 452         }
 453
 454 leave:
 455         if (status < 0 && did_quota_inode)
 456                 dquot_free_inode(inode);
 457         if (handle)
 458                 ocfs2_commit_trans(osb, handle);
 459
 460         ocfs2_inode_unlock(dir, 1);
 461         if (did_block_signals)
 462                 ocfs2_unblock_signals(&oldset);
 463
 464         brelse(new_fe_bh);
 465         brelse(parent_fe_bh);
 466         kfree(si.value);
 467
 468         ocfs2_free_dir_lookup_result(&lookup);
 469
 470         if (inode_ac)
 471                 ocfs2_free_alloc_context(inode_ac);
 472
 473         if (data_ac)
 474                 ocfs2_free_alloc_context(data_ac);
 475
 476         if (meta_ac)
 477                 ocfs2_free_alloc_context(meta_ac);
 478
 479         /*
 480          * We should call iput after the i_mutex of the bitmap been
 481          * unlocked in ocfs2_free_alloc_context, or the
 482          * ocfs2_delete_inode will mutex_lock again.
 483          */
 484         if ((status < 0) && inode) {
 485                 if (dl)
 486                         ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
 487
 488                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
 489                 clear_nlink(inode);
 490                 iput(inode);
 491         }
 492
 493         if (status)
 494                 mlog_errno(status);
 495
 496         return status;
 497 }
 498
 499 static int __ocfs2_mknod_locked(struct inode *dir,
 500                                 struct inode *inode,
 501                                 dev_t dev,
 502                                 struct buffer_head **new_fe_bh,
 503                                 struct buffer_head *parent_fe_bh,
 504                                 handle_t *handle,
 505                                 struct ocfs2_alloc_context *inode_ac,
 506                                 u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
 507 {
 508         int status = 0;
 509         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 510         struct ocfs2_dinode *fe = NULL;
 511         struct ocfs2_extent_list *fel;
 512         u16 feat;
 513         struct ocfs2_inode_info *oi = OCFS2_I(inode);
 514         struct timespec64 ts;
 515
 516         *new_fe_bh = NULL;
 517
 518         /* populate as many fields early on as possible - many of
 519          * these are used by the support functions here and in
 520          * callers. */
 521         inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
 522         oi->ip_blkno = fe_blkno;
 523         spin_lock(&osb->osb_lock);
 524         inode->i_generation = osb->s_next_generation++;
 525         spin_unlock(&osb->osb_lock);
 526
 527         *new_fe_bh = sb_getblk(osb->sb, fe_blkno);
 528         if (!*new_fe_bh) {
 529                 status = -ENOMEM;
 530                 mlog_errno(status);
 531                 goto leave;
 532         }
 533         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), *new_fe_bh);
 534
 535         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 536                                          *new_fe_bh,
 537                                          OCFS2_JOURNAL_ACCESS_CREATE);
 538         if (status < 0) {
 539                 mlog_errno(status);
 540                 goto leave;
 541         }
 542
 543         fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
 544         memset(fe, 0, osb->sb->s_blocksize);
 545
 546         fe->i_generation = cpu_to_le32(inode->i_generation);
 547         fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
 548         fe->i_blkno = cpu_to_le64(fe_blkno);
 549         fe->i_suballoc_loc = cpu_to_le64(suballoc_loc);
 550         fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
 551         fe->i_suballoc_slot = cpu_to_le16(inode_ac->ac_alloc_slot);
 552         fe->i_uid = cpu_to_le32(i_uid_read(inode));
 553         fe->i_gid = cpu_to_le32(i_gid_read(inode));
 554         fe->i_mode = cpu_to_le16(inode->i_mode);
 555         if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
 556                 fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
 557
 558         ocfs2_set_links_count(fe, inode->i_nlink);
 559
 560         fe->i_last_eb_blk = 0;
 561         strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
 562         fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
 563         ktime_get_real_ts64(&ts);
 564         fe->i_atime = fe->i_ctime = fe->i_mtime =
 565                 cpu_to_le64(ts.tv_sec);
 566         fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
 567                 cpu_to_le32(ts.tv_nsec);
 568         fe->i_dtime = 0;
 569
 570         /*
 571          * If supported, directories start with inline data. If inline
 572          * isn't supported, but indexing is, we start them as indexed.
 573          */
 574         feat = le16_to_cpu(fe->i_dyn_features);
 575         if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
 576                 fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
 577
 578                 fe->id2.i_data.id_count = cpu_to_le16(
 579                                 ocfs2_max_inline_data_with_xattr(osb->sb, fe));
 580         } else {
 581                 fel = &fe->id2.i_list;
 582                 fel->l_tree_depth = 0;
 583                 fel->l_next_free_rec = 0;
 584                 fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
 585         }
 586
 587         ocfs2_journal_dirty(handle, *new_fe_bh);
 588
 589         ocfs2_populate_inode(inode, fe, 1);
 590         ocfs2_ci_set_new(osb, INODE_CACHE(inode));
 591         if (!ocfs2_mount_local(osb)) {
 592                 status = ocfs2_create_new_inode_locks(inode);
 593                 if (status < 0)
 594                         mlog_errno(status);
 595         }
 596
 597         ocfs2_update_inode_fsync_trans(handle, inode, 1);
 598
 599 leave:
 600         if (status < 0) {
 601                 if (*new_fe_bh) {
 602                         brelse(*new_fe_bh);
 603                         *new_fe_bh = NULL;
 604                 }
 605         }
 606
 607         if (status)
 608                 mlog_errno(status);
 609         return status;
 610 }
 611
 612 static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 613                               struct inode *dir,
 614                               struct inode *inode,
 615                               dev_t dev,
 616                               struct buffer_head **new_fe_bh,
 617                               struct buffer_head *parent_fe_bh,
 618                               handle_t *handle,
 619                               struct ocfs2_alloc_context *inode_ac)
 620 {
 621         int status = 0;
 622         u64 suballoc_loc, fe_blkno = 0;
 623         u16 suballoc_bit;
 624
 625         *new_fe_bh = NULL;
 626
 627         status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
 628                                        inode_ac, &suballoc_loc,
 629                                        &suballoc_bit, &fe_blkno);
 630         if (status < 0) {
 631                 mlog_errno(status);
 632                 return status;
 633         }
 634
 635         status = __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
 636                                     parent_fe_bh, handle, inode_ac,
 637                                     fe_blkno, suballoc_loc, suballoc_bit);
 638         if (status < 0) {
 639                 u64 bg_blkno = ocfs2_which_suballoc_group(fe_blkno, suballoc_bit);
 640                 int tmp = ocfs2_free_suballoc_bits(handle, inode_ac->ac_inode,
 641                                 inode_ac->ac_bh, suballoc_bit, bg_blkno, 1);
 642                 if (tmp)
 643                         mlog_errno(tmp);
 644         }
 645
 646         return status;
 647 }
 648
 649 static int ocfs2_mkdir(struct user_namespace *mnt_userns,
 650                        struct inode *dir,
 651                        struct dentry *dentry,
 652                        umode_t mode)
 653 {
 654         int ret;
 655
 656         trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 657                           OCFS2_I(dir)->ip_blkno, mode);
 658         ret = ocfs2_mknod(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
 659         if (ret)
 660                 mlog_errno(ret);
 661
 662         return ret;
 663 }
 664
 665 static int ocfs2_create(struct user_namespace *mnt_userns,
 666                         struct inode *dir,
 667                         struct dentry *dentry,
 668                         umode_t mode,
 669                         bool excl)
 670 {
 671         int ret;
 672
 673         trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
 674                            (unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
 675         ret = ocfs2_mknod(&init_user_ns, dir, dentry, mode | S_IFREG, 0);
 676         if (ret)
 677                 mlog_errno(ret);
 678
 679         return ret;
 680 }
 681
 682 static int ocfs2_link(struct dentry *old_dentry,
 683                       struct inode *dir,
 684                       struct dentry *dentry)
 685 {
 686         handle_t *handle;
 687         struct inode *inode = d_inode(old_dentry);
 688         struct inode *old_dir = d_inode(old_dentry->d_parent);
 689         int err;
 690         struct buffer_head *fe_bh = NULL;
 691         struct buffer_head *old_dir_bh = NULL;
 692         struct buffer_head *parent_fe_bh = NULL;
 693         struct ocfs2_dinode *fe = NULL;
 694         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 695         struct ocfs2_dir_lookup_result lookup = { NULL, };
 696         sigset_t oldset;
 697         u64 old_de_ino;
 698
 699         trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
 700                          old_dentry->d_name.len, old_dentry->d_name.name,
 701                          dentry->d_name.len, dentry->d_name.name);
 702
 703         if (S_ISDIR(inode->i_mode))
 704                 return -EPERM;
 705
 706         err = dquot_initialize(dir);
 707         if (err) {
 708                 mlog_errno(err);
 709                 return err;
 710         }
 711
 712         err = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
 713                         &parent_fe_bh, dir, 0);
 714         if (err < 0) {
 715                 if (err != -ENOENT)
 716                         mlog_errno(err);
 717                 return err;
 718         }
 719
 720         /* make sure both dirs have bhs
 721          * get an extra ref on old_dir_bh if old==new */
 722         if (!parent_fe_bh) {
 723                 if (old_dir_bh) {
 724                         parent_fe_bh = old_dir_bh;
 725                         get_bh(parent_fe_bh);
 726                 } else {
 727                         mlog(ML_ERROR, "%s: no old_dir_bh!\n", osb->uuid_str);
 728                         err = -EIO;
 729                         goto out;
 730                 }
 731         }
 732
 733         if (!dir->i_nlink) {
 734                 err = -ENOENT;
 735                 goto out;
 736         }
 737
 738         err = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
 739                         old_dentry->d_name.len, &old_de_ino);
 740         if (err) {
 741                 err = -ENOENT;
 742                 goto out;
 743         }
 744
 745         /*
 746          * Check whether another node removed the source inode while we
 747          * were in the vfs.
 748          */
 749         if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
 750                 err = -ENOENT;
 751                 goto out;
 752         }
 753
 754         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
 755                                         dentry->d_name.len);
 756         if (err)
 757                 goto out;
 758
 759         err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
 760                                            dentry->d_name.name,
 761                                            dentry->d_name.len, &lookup);
 762         if (err < 0) {
 763                 mlog_errno(err);
 764                 goto out;
 765         }
 766
 767         err = ocfs2_inode_lock(inode, &fe_bh, 1);
 768         if (err < 0) {
 769                 if (err != -ENOENT)
 770                         mlog_errno(err);
 771                 goto out;
 772         }
 773
 774         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 775         if (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
 776                 err = -EMLINK;
 777                 goto out_unlock_inode;
 778         }
 779
 780         handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
 781         if (IS_ERR(handle)) {
 782                 err = PTR_ERR(handle);
 783                 handle = NULL;
 784                 mlog_errno(err);
 785                 goto out_unlock_inode;
 786         }
 787
 788         /* Starting to change things, restart is no longer possible. */
 789         ocfs2_block_signals(&oldset);
 790
 791         err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 792                                       OCFS2_JOURNAL_ACCESS_WRITE);
 793         if (err < 0) {
 794                 mlog_errno(err);
 795                 goto out_commit;
 796         }
 797
 798         inc_nlink(inode);
 799         inode->i_ctime = current_time(inode);
 800         ocfs2_set_links_count(fe, inode->i_nlink);
 801         fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
 802         fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
 803         ocfs2_journal_dirty(handle, fe_bh);
 804
 805         err = ocfs2_add_entry(handle, dentry, inode,
 806                               OCFS2_I(inode)->ip_blkno,
 807                               parent_fe_bh, &lookup);
 808         if (err) {
 809                 ocfs2_add_links_count(fe, -1);
 810                 drop_nlink(inode);
 811                 mlog_errno(err);
 812                 goto out_commit;
 813         }
 814
 815         err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
 816         if (err) {
 817                 mlog_errno(err);
 818                 goto out_commit;
 819         }
 820
 821         ihold(inode);
 822         d_instantiate(dentry, inode);
 823
 824 out_commit:
 825         ocfs2_commit_trans(osb, handle);
 826         ocfs2_unblock_signals(&oldset);
 827 out_unlock_inode:
 828         ocfs2_inode_unlock(inode, 1);
 829
 830 out:
 831         ocfs2_double_unlock(old_dir, dir);
 832
 833         brelse(fe_bh);
 834         brelse(parent_fe_bh);
 835         brelse(old_dir_bh);
 836
 837         ocfs2_free_dir_lookup_result(&lookup);
 838
 839         if (err)
 840                 mlog_errno(err);
 841
 842         return err;
 843 }
 844
 845 /*
 846  * Takes and drops an exclusive lock on the given dentry. This will
 847  * force other nodes to drop it.
 848  */
 849 static int ocfs2_remote_dentry_delete(struct dentry *dentry)
 850 {
 851         int ret;
 852
 853         ret = ocfs2_dentry_lock(dentry, 1);
 854         if (ret)
 855                 mlog_errno(ret);
 856         else
 857                 ocfs2_dentry_unlock(dentry, 1);
 858
 859         return ret;
 860 }
 861
 862 static inline int ocfs2_inode_is_unlinkable(struct inode *inode)
 863 {
 864         if (S_ISDIR(inode->i_mode)) {
 865                 if (inode->i_nlink == 2)
 866                         return 1;
 867                 return 0;
 868         }
 869
 870         if (inode->i_nlink == 1)
 871                 return 1;
 872         return 0;
 873 }
 874
 875 static int ocfs2_unlink(struct inode *dir,
 876                         struct dentry *dentry)
 877 {
 878         int status;
 879         int child_locked = 0;
 880         bool is_unlinkable = false;
 881         struct inode *inode = d_inode(dentry);
 882         struct inode *orphan_dir = NULL;
 883         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 884         u64 blkno;
 885         struct ocfs2_dinode *fe = NULL;
 886         struct buffer_head *fe_bh = NULL;
 887         struct buffer_head *parent_node_bh = NULL;
 888         handle_t *handle = NULL;
 889         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
 890         struct ocfs2_dir_lookup_result lookup = { NULL, };
 891         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
 892
 893         trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
 894                            dentry->d_name.name,
 895                            (unsigned long long)OCFS2_I(dir)->ip_blkno,
 896                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
 897
 898         status = dquot_initialize(dir);
 899         if (status) {
 900                 mlog_errno(status);
 901                 return status;
 902         }
 903
 904         BUG_ON(d_inode(dentry->d_parent) != dir);
 905
 906         if (inode == osb->root_inode)
 907                 return -EPERM;
 908
 909         status = ocfs2_inode_lock_nested(dir, &parent_node_bh, 1,
 910                                          OI_LS_PARENT);
 911         if (status < 0) {
 912                 if (status != -ENOENT)
 913                         mlog_errno(status);
 914                 return status;
 915         }
 916
 917         status = ocfs2_find_files_on_disk(dentry->d_name.name,
 918                                           dentry->d_name.len, &blkno, dir,
 919                                           &lookup);
 920         if (status < 0) {
 921                 if (status != -ENOENT)
 922                         mlog_errno(status);
 923                 goto leave;
 924         }
 925
 926         if (OCFS2_I(inode)->ip_blkno != blkno) {
 927                 status = -ENOENT;
 928
 929                 trace_ocfs2_unlink_noent(
 930                                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
 931                                 (unsigned long long)blkno,
 932                                 OCFS2_I(inode)->ip_flags);
 933                 goto leave;
 934         }
 935
 936         status = ocfs2_inode_lock(inode, &fe_bh, 1);
 937         if (status < 0) {
 938                 if (status != -ENOENT)
 939                         mlog_errno(status);
 940                 goto leave;
 941         }
 942         child_locked = 1;
 943
 944         if (S_ISDIR(inode->i_mode)) {
 945                 if (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
 946                         status = -ENOTEMPTY;
 947                         goto leave;
 948                 }
 949         }
 950
 951         status = ocfs2_remote_dentry_delete(dentry);
 952         if (status < 0) {
 953                 /* This remote delete should succeed under all normal
 954                  * circumstances. */
 955                 mlog_errno(status);
 956                 goto leave;
 957         }
 958
 959         if (ocfs2_inode_is_unlinkable(inode)) {
 960                 status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
 961                                                   OCFS2_I(inode)->ip_blkno,
 962                                                   orphan_name, &orphan_insert,
 963                                                   false);
 964                 if (status < 0) {
 965                         mlog_errno(status);
 966                         goto leave;
 967                 }
 968                 is_unlinkable = true;
 969         }
 970
 971         handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
 972         if (IS_ERR(handle)) {
 973                 status = PTR_ERR(handle);
 974                 handle = NULL;
 975                 mlog_errno(status);
 976                 goto leave;
 977         }
 978
 979         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
 980                                          OCFS2_JOURNAL_ACCESS_WRITE);
 981         if (status < 0) {
 982                 mlog_errno(status);
 983                 goto leave;
 984         }
 985
 986         fe = (struct ocfs2_dinode *) fe_bh->b_data;
 987
 988         /* delete the name from the parent dir */
 989         status = ocfs2_delete_entry(handle, dir, &lookup);
 990         if (status < 0) {
 991                 mlog_errno(status);
 992                 goto leave;
 993         }
 994
 995         if (S_ISDIR(inode->i_mode))
 996                 drop_nlink(inode);
 997         drop_nlink(inode);
 998         ocfs2_set_links_count(fe, inode->i_nlink);
 999         ocfs2_journal_dirty(handle, fe_bh);
1000
1001         dir->i_ctime = dir->i_mtime = current_time(dir);
1002         if (S_ISDIR(inode->i_mode))
1003                 drop_nlink(dir);
1004
1005         status = ocfs2_mark_inode_dirty(handle, dir, parent_node_bh);
1006         if (status < 0) {
1007                 mlog_errno(status);
1008                 if (S_ISDIR(inode->i_mode))
1009                         inc_nlink(dir);
1010                 goto leave;
1011         }
1012
1013         if (is_unlinkable) {
1014                 status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
1015                                 orphan_name, &orphan_insert, orphan_dir, false);
1016                 if (status < 0)
1017                         mlog_errno(status);
1018         }
1019
1020 leave:
1021         if (handle)
1022                 ocfs2_commit_trans(osb, handle);
1023
1024         if (orphan_dir) {
1025                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1026                 ocfs2_inode_unlock(orphan_dir, 1);
1027                 inode_unlock(orphan_dir);
1028                 iput(orphan_dir);
1029         }
1030
1031         if (child_locked)
1032                 ocfs2_inode_unlock(inode, 1);
1033
1034         ocfs2_inode_unlock(dir, 1);
1035
1036         brelse(fe_bh);
1037         brelse(parent_node_bh);
1038
1039         ocfs2_free_dir_lookup_result(&orphan_insert);
1040         ocfs2_free_dir_lookup_result(&lookup);
1041
1042         if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
1043                 mlog_errno(status);
1044
1045         return status;
1046 }
1047
1048 static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
1049                 u64 src_inode_no, u64 dest_inode_no)
1050 {
1051         int ret = 0, i = 0;
1052         u64 parent_inode_no = 0;
1053         u64 child_inode_no = src_inode_no;
1054         struct inode *child_inode;
1055
1056 #define MAX_LOOKUP_TIMES 32
1057         while (1) {
1058                 child_inode = ocfs2_iget(osb, child_inode_no, 0, 0);
1059                 if (IS_ERR(child_inode)) {
1060                         ret = PTR_ERR(child_inode);
1061                         break;
1062                 }
1063
1064                 ret = ocfs2_inode_lock(child_inode, NULL, 0);
1065                 if (ret < 0) {
1066                         iput(child_inode);
1067                         if (ret != -ENOENT)
1068                                 mlog_errno(ret);
1069                         break;
1070                 }
1071
1072                 ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
1073                                 &parent_inode_no);
1074                 ocfs2_inode_unlock(child_inode, 0);
1075                 iput(child_inode);
1076                 if (ret < 0) {
1077                         ret = -ENOENT;
1078                         break;
1079                 }
1080
1081                 if (parent_inode_no == dest_inode_no) {
1082                         ret = 1;
1083                         break;
1084                 }
1085
1086                 if (parent_inode_no == osb->root_inode->i_ino) {
1087                         ret = 0;
1088                         break;
1089                 }
1090
1091                 child_inode_no = parent_inode_no;
1092
1093                 if (++i >= MAX_LOOKUP_TIMES) {
1094                         mlog_ratelimited(ML_NOTICE, "max lookup times reached, "
1095                                         "filesystem may have nested directories, "
1096                                         "src inode: %llu, dest inode: %llu.\n",
1097                                         (unsigned long long)src_inode_no,
1098                                         (unsigned long long)dest_inode_no);
1099                         ret = 0;
1100                         break;
1101                 }
1102         }
1103
1104         return ret;
1105 }
1106
1107 /*
1108  * The only place this should be used is rename and link!
1109  * if they have the same id, then the 1st one is the only one locked.
1110  */
1111 static int ocfs2_double_lock(struct ocfs2_super *osb,
1112                              struct buffer_head **bh1,
1113                              struct inode *inode1,
1114                              struct buffer_head **bh2,
1115                              struct inode *inode2,
1116                              int rename)
1117 {
1118         int status;
1119         int inode1_is_ancestor, inode2_is_ancestor;
1120         struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
1121         struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
1122
1123         trace_ocfs2_double_lock((unsigned long long)oi1->ip_blkno,
1124                                 (unsigned long long)oi2->ip_blkno);
1125
1126         if (*bh1)
1127                 *bh1 = NULL;
1128         if (*bh2)
1129                 *bh2 = NULL;
1130
1131         /* we always want to lock the one with the lower lockid first.
1132          * and if they are nested, we lock ancestor first */
1133         if (oi1->ip_blkno != oi2->ip_blkno) {
1134                 inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
1135                                 oi1->ip_blkno);
1136                 if (inode1_is_ancestor < 0) {
1137                         status = inode1_is_ancestor;
1138                         goto bail;
1139                 }
1140
1141                 inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
1142                                 oi2->ip_blkno);
1143                 if (inode2_is_ancestor < 0) {
1144                         status = inode2_is_ancestor;
1145                         goto bail;
1146                 }
1147
1148                 if ((inode1_is_ancestor == 1) ||
1149                                 (oi1->ip_blkno < oi2->ip_blkno &&
1150                                 inode2_is_ancestor == 0)) {
1151                         /* switch id1 and id2 around */
1152                         swap(bh2, bh1);
1153                         swap(inode2, inode1);
1154                 }
1155                 /* lock id2 */
1156                 status = ocfs2_inode_lock_nested(inode2, bh2, 1,
1157                                 rename == 1 ? OI_LS_RENAME1 : OI_LS_PARENT);
1158                 if (status < 0) {
1159                         if (status != -ENOENT)
1160                                 mlog_errno(status);
1161                         goto bail;
1162                 }
1163         }
1164
1165         /* lock id1 */
1166         status = ocfs2_inode_lock_nested(inode1, bh1, 1,
1167                         rename == 1 ?  OI_LS_RENAME2 : OI_LS_PARENT);
1168         if (status < 0) {
1169                 /*
1170                  * An error return must mean that no cluster locks
1171                  * were held on function exit.
1172                  */
1173                 if (oi1->ip_blkno != oi2->ip_blkno) {
1174                         ocfs2_inode_unlock(inode2, 1);
1175                         brelse(*bh2);
1176                         *bh2 = NULL;
1177                 }
1178
1179                 if (status != -ENOENT)
1180                         mlog_errno(status);
1181         }
1182
1183         trace_ocfs2_double_lock_end(
1184                         (unsigned long long)oi1->ip_blkno,
1185                         (unsigned long long)oi2->ip_blkno);
1186
1187 bail:
1188         if (status)
1189                 mlog_errno(status);
1190         return status;
1191 }
1192
1193 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
1194 {
1195         ocfs2_inode_unlock(inode1, 1);
1196
1197         if (inode1 != inode2)
1198                 ocfs2_inode_unlock(inode2, 1);
1199 }
1200
1201 static int ocfs2_rename(struct user_namespace *mnt_userns,
1202                         struct inode *old_dir,
1203                         struct dentry *old_dentry,
1204                         struct inode *new_dir,
1205                         struct dentry *new_dentry,
1206                         unsigned int flags)
1207 {
1208         int status = 0, rename_lock = 0, parents_locked = 0, target_exists = 0;
1209         int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 0;
1210         struct inode *old_inode = d_inode(old_dentry);
1211         struct inode *new_inode = d_inode(new_dentry);
1212         struct inode *orphan_dir = NULL;
1213         struct ocfs2_dinode *newfe = NULL;
1214         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
1215         struct buffer_head *newfe_bh = NULL;
1216         struct buffer_head *old_inode_bh = NULL;
1217         struct ocfs2_super *osb = NULL;
1218         u64 newfe_blkno, old_de_ino;
1219         handle_t *handle = NULL;
1220         struct buffer_head *old_dir_bh = NULL;
1221         struct buffer_head *new_dir_bh = NULL;
1222         u32 old_dir_nlink = old_dir->i_nlink;
1223         struct ocfs2_dinode *old_di;
1224         struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
1225         struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
1226         struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
1227         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
1228         struct ocfs2_dir_lookup_result target_insert = { NULL, };
1229         bool should_add_orphan = false;
1230
1231         if (flags)
1232                 return -EINVAL;
1233
1234         /* At some point it might be nice to break this function up a
1235          * bit. */
1236
1237         trace_ocfs2_rename(old_dir, old_dentry, new_dir, new_dentry,
1238                            old_dentry->d_name.len, old_dentry->d_name.name,
1239                            new_dentry->d_name.len, new_dentry->d_name.name);
1240
1241         status = dquot_initialize(old_dir);
1242         if (status) {
1243                 mlog_errno(status);
1244                 goto bail;
1245         }
1246         status = dquot_initialize(new_dir);
1247         if (status) {
1248                 mlog_errno(status);
1249                 goto bail;
1250         }
1251
1252         osb = OCFS2_SB(old_dir->i_sb);
1253
1254         if (new_inode) {
1255                 if (!igrab(new_inode))
1256                         BUG();
1257         }
1258
1259         /* Assume a directory hierarchy thusly:
1260          * a/b/c
1261          * a/d
1262          * a,b,c, and d are all directories.
1263          *
1264          * from cwd of 'a' on both nodes:
1265          * node1: mv b/c d
1266          * node2: mv d   b/c
1267          *
1268          * And that's why, just like the VFS, we need a file system
1269          * rename lock. */
1270         if (old_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
1271                 status = ocfs2_rename_lock(osb);
1272                 if (status < 0) {
1273                         mlog_errno(status);
1274                         goto bail;
1275                 }
1276                 rename_lock = 1;
1277
1278                 /* here we cannot guarantee the inodes haven't just been
1279                  * changed, so check if they are nested again */
1280                 status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
1281                                 old_inode->i_ino);
1282                 if (status < 0) {
1283                         mlog_errno(status);
1284                         goto bail;
1285                 } else if (status == 1) {
1286                         status = -EPERM;
1287                         trace_ocfs2_rename_not_permitted(
1288                                         (unsigned long long)old_inode->i_ino,
1289                                         (unsigned long long)new_dir->i_ino);
1290                         goto bail;
1291                 }
1292         }
1293
1294         /* if old and new are the same, this'll just do one lock. */
1295         status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
1296                                    &new_dir_bh, new_dir, 1);
1297         if (status < 0) {
1298                 mlog_errno(status);
1299                 goto bail;
1300         }
1301         parents_locked = 1;
1302
1303         if (!new_dir->i_nlink) {
1304                 status = -EACCES;
1305                 goto bail;
1306         }
1307
1308         /* make sure both dirs have bhs
1309          * get an extra ref on old_dir_bh if old==new */
1310         if (!new_dir_bh) {
1311                 if (old_dir_bh) {
1312                         new_dir_bh = old_dir_bh;
1313                         get_bh(new_dir_bh);
1314                 } else {
1315                         mlog(ML_ERROR, "no old_dir_bh!\n");
1316                         status = -EIO;
1317                         goto bail;
1318                 }
1319         }
1320
1321         /*
1322          * Aside from allowing a meta data update, the locking here
1323          * also ensures that the downconvert thread on other nodes
1324          * won't have to concurrently downconvert the inode and the
1325          * dentry locks.
1326          */
1327         status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
1328                                          OI_LS_PARENT);
1329         if (status < 0) {
1330                 if (status != -ENOENT)
1331                         mlog_errno(status);
1332                 goto bail;
1333         }
1334         old_child_locked = 1;
1335
1336         status = ocfs2_remote_dentry_delete(old_dentry);
1337         if (status < 0) {
1338                 mlog_errno(status);
1339                 goto bail;
1340         }
1341
1342         if (S_ISDIR(old_inode->i_mode)) {
1343                 u64 old_inode_parent;
1344
1345                 update_dot_dot = 1;
1346                 status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
1347                                                   old_inode,
1348                                                   &old_inode_dot_dot_res);
1349                 if (status) {
1350                         status = -EIO;
1351                         goto bail;
1352                 }
1353
1354                 if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
1355                         status = -EIO;
1356                         goto bail;
1357                 }
1358
1359                 if (!new_inode && new_dir != old_dir &&
1360                     new_dir->i_nlink >= ocfs2_link_max(osb)) {
1361                         status = -EMLINK;
1362                         goto bail;
1363                 }
1364         }
1365
1366         status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
1367                                             old_dentry->d_name.len,
1368                                             &old_de_ino);
1369         if (status) {
1370                 status = -ENOENT;
1371                 goto bail;
1372         }
1373
1374         /*
1375          *  Check for inode number is _not_ due to possible IO errors.
1376          *  We might rmdir the source, keep it as pwd of some process
1377          *  and merrily kill the link to whatever was created under the
1378          *  same name. Goodbye sticky bit ;-<
1379          */
1380         if (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
1381                 status = -ENOENT;
1382                 goto bail;
1383         }
1384
1385         /* check if the target already exists (in which case we need
1386          * to delete it */
1387         status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
1388                                           new_dentry->d_name.len,
1389                                           &newfe_blkno, new_dir,
1390                                           &target_lookup_res);
1391         /* The only error we allow here is -ENOENT because the new
1392          * file not existing is perfectly valid. */
1393         if ((status < 0) && (status != -ENOENT)) {
1394                 /* If we cannot find the file specified we should just */
1395                 /* return the error... */
1396                 mlog_errno(status);
1397                 goto bail;
1398         }
1399         if (status == 0)
1400                 target_exists = 1;
1401
1402         if (!target_exists && new_inode) {
1403                 /*
1404                  * Target was unlinked by another node while we were
1405                  * waiting to get to ocfs2_rename(). There isn't
1406                  * anything we can do here to help the situation, so
1407                  * bubble up the appropriate error.
1408                  */
1409                 status = -ENOENT;
1410                 goto bail;
1411         }
1412
1413         /* In case we need to overwrite an existing file, we blow it
1414          * away first */
1415         if (target_exists) {
1416                 /* VFS didn't think there existed an inode here, but
1417                  * someone else in the cluster must have raced our
1418                  * rename to create one. Today we error cleanly, in
1419                  * the future we should consider calling iget to build
1420                  * a new struct inode for this entry. */
1421                 if (!new_inode) {
1422                         status = -EACCES;
1423
1424                         trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
1425                                                 new_dentry->d_name.name);
1426                         goto bail;
1427                 }
1428
1429                 if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
1430                         status = -EACCES;
1431
1432                         trace_ocfs2_rename_disagree(
1433                              (unsigned long long)OCFS2_I(new_inode)->ip_blkno,
1434                              (unsigned long long)newfe_blkno,
1435                              OCFS2_I(new_inode)->ip_flags);
1436                         goto bail;
1437                 }
1438
1439                 status = ocfs2_inode_lock(new_inode, &newfe_bh, 1);
1440                 if (status < 0) {
1441                         if (status != -ENOENT)
1442                                 mlog_errno(status);
1443                         goto bail;
1444                 }
1445                 new_child_locked = 1;
1446
1447                 status = ocfs2_remote_dentry_delete(new_dentry);
1448                 if (status < 0) {
1449                         mlog_errno(status);
1450                         goto bail;
1451                 }
1452
1453                 newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
1454
1455                 trace_ocfs2_rename_over_existing(
1456                      (unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
1457                      (unsigned long long)newfe_bh->b_blocknr : 0ULL);
1458
1459                 if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
1460                         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
1461                                                 OCFS2_I(new_inode)->ip_blkno,
1462                                                 orphan_name, &orphan_insert,
1463                                                 false);
1464                         if (status < 0) {
1465                                 mlog_errno(status);
1466                                 goto bail;
1467                         }
1468                         should_add_orphan = true;
1469                 }
1470         } else {
1471                 BUG_ON(d_inode(new_dentry->d_parent) != new_dir);
1472
1473                 status = ocfs2_check_dir_for_entry(new_dir,
1474                                                    new_dentry->d_name.name,
1475                                                    new_dentry->d_name.len);
1476                 if (status)
1477                         goto bail;
1478
1479                 status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
1480                                                       new_dentry->d_name.name,
1481                                                       new_dentry->d_name.len,
1482                                                       &target_insert);
1483                 if (status < 0) {
1484                         mlog_errno(status);
1485                         goto bail;
1486                 }
1487         }
1488
1489         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
1490         if (IS_ERR(handle)) {
1491                 status = PTR_ERR(handle);
1492                 handle = NULL;
1493                 mlog_errno(status);
1494                 goto bail;
1495         }
1496
1497         if (target_exists) {
1498                 if (S_ISDIR(new_inode->i_mode)) {
1499                         if (new_inode->i_nlink != 2 ||
1500                             !ocfs2_empty_dir(new_inode)) {
1501                                 status = -ENOTEMPTY;
1502                                 goto bail;
1503                         }
1504                 }
1505                 status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
1506                                                  newfe_bh,
1507                                                  OCFS2_JOURNAL_ACCESS_WRITE);
1508                 if (status < 0) {
1509                         mlog_errno(status);
1510                         goto bail;
1511                 }
1512
1513                 /* change the dirent to point to the correct inode */
1514                 status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
1515                                             old_inode);
1516                 if (status < 0) {
1517                         mlog_errno(status);
1518                         goto bail;
1519                 }
1520                 inode_inc_iversion(new_dir);
1521
1522                 if (S_ISDIR(new_inode->i_mode))
1523                         ocfs2_set_links_count(newfe, 0);
1524                 else
1525                         ocfs2_add_links_count(newfe, -1);
1526                 ocfs2_journal_dirty(handle, newfe_bh);
1527                 if (should_add_orphan) {
1528                         status = ocfs2_orphan_add(osb, handle, new_inode,
1529                                         newfe_bh, orphan_name,
1530                                         &orphan_insert, orphan_dir, false);
1531                         if (status < 0) {
1532                                 mlog_errno(status);
1533                                 goto bail;
1534                         }
1535                 }
1536         } else {
1537                 /* if the name was not found in new_dir, add it now */
1538                 status = ocfs2_add_entry(handle, new_dentry, old_inode,
1539                                          OCFS2_I(old_inode)->ip_blkno,
1540                                          new_dir_bh, &target_insert);
1541         }
1542
1543         old_inode->i_ctime = current_time(old_inode);
1544         mark_inode_dirty(old_inode);
1545
1546         status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
1547                                          old_inode_bh,
1548                                          OCFS2_JOURNAL_ACCESS_WRITE);
1549         if (status >= 0) {
1550                 old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
1551
1552                 old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
1553                 old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
1554                 ocfs2_journal_dirty(handle, old_inode_bh);
1555         } else
1556                 mlog_errno(status);
1557
1558         /*
1559          * Now that the name has been added to new_dir, remove the old name.
1560          *
1561          * We don't keep any directory entry context around until now
1562          * because the insert might have changed the type of directory
1563          * we're dealing with.
1564          */
1565         status = ocfs2_find_entry(old_dentry->d_name.name,
1566                                   old_dentry->d_name.len, old_dir,
1567                                   &old_entry_lookup);
1568         if (status) {
1569                 if (!is_journal_aborted(osb->journal->j_journal)) {
1570                         ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
1571                                         "is not deleted.",
1572                                         new_dentry->d_name.len, new_dentry->d_name.name,
1573                                         old_dentry->d_name.len, old_dentry->d_name.name);
1574                 }
1575                 goto bail;
1576         }
1577
1578         status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
1579         if (status < 0) {
1580                 mlog_errno(status);
1581                 if (!is_journal_aborted(osb->journal->j_journal)) {
1582                         ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
1583                                         "is not deleted.",
1584                                         new_dentry->d_name.len, new_dentry->d_name.name,
1585                                         old_dentry->d_name.len, old_dentry->d_name.name);
1586                 }
1587                 goto bail;
1588         }
1589
1590         if (new_inode) {
1591                 drop_nlink(new_inode);
1592                 new_inode->i_ctime = current_time(new_inode);
1593         }
1594         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1595
1596         if (update_dot_dot) {
1597                 status = ocfs2_update_entry(old_inode, handle,
1598                                             &old_inode_dot_dot_res, new_dir);
1599                 drop_nlink(old_dir);
1600                 if (new_inode) {
1601                         drop_nlink(new_inode);
1602                 } else {
1603                         inc_nlink(new_dir);
1604                         mark_inode_dirty(new_dir);
1605                 }
1606         }
1607         mark_inode_dirty(old_dir);
1608         ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
1609         if (new_inode) {
1610                 mark_inode_dirty(new_inode);
1611                 ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
1612         }
1613
1614         if (old_dir != new_dir) {
1615                 /* Keep the same times on both directories.*/
1616                 new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
1617
1618                 /*
1619                  * This will also pick up the i_nlink change from the
1620                  * block above.
1621                  */
1622                 ocfs2_mark_inode_dirty(handle, new_dir, new_dir_bh);
1623         }
1624
1625         if (old_dir_nlink != old_dir->i_nlink) {
1626                 if (!old_dir_bh) {
1627                         mlog(ML_ERROR, "need to change nlink for old dir "
1628                              "%llu from %d to %d but bh is NULL!\n",
1629                              (unsigned long long)OCFS2_I(old_dir)->ip_blkno,
1630                              (int)old_dir_nlink, old_dir->i_nlink);
1631                 } else {
1632                         struct ocfs2_dinode *fe;
1633                         status = ocfs2_journal_access_di(handle,
1634                                                          INODE_CACHE(old_dir),
1635                                                          old_dir_bh,
1636                                                          OCFS2_JOURNAL_ACCESS_WRITE);
1637                         fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
1638                         ocfs2_set_links_count(fe, old_dir->i_nlink);
1639                         ocfs2_journal_dirty(handle, old_dir_bh);
1640                 }
1641         }
1642         ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
1643         status = 0;
1644 bail:
1645         if (handle)
1646                 ocfs2_commit_trans(osb, handle);
1647
1648         if (orphan_dir) {
1649                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
1650                 ocfs2_inode_unlock(orphan_dir, 1);
1651                 inode_unlock(orphan_dir);
1652                 iput(orphan_dir);
1653         }
1654
1655         if (new_child_locked)
1656                 ocfs2_inode_unlock(new_inode, 1);
1657
1658         if (old_child_locked)
1659                 ocfs2_inode_unlock(old_inode, 1);
1660
1661         if (parents_locked)
1662                 ocfs2_double_unlock(old_dir, new_dir);
1663
1664         if (rename_lock)
1665                 ocfs2_rename_unlock(osb);
1666
1667         if (new_inode)
1668                 sync_mapping_buffers(old_inode->i_mapping);
1669
1670         iput(new_inode);
1671
1672         ocfs2_free_dir_lookup_result(&target_lookup_res);
1673         ocfs2_free_dir_lookup_result(&old_entry_lookup);
1674         ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
1675         ocfs2_free_dir_lookup_result(&orphan_insert);
1676         ocfs2_free_dir_lookup_result(&target_insert);
1677
1678         brelse(newfe_bh);
1679         brelse(old_inode_bh);
1680         brelse(old_dir_bh);
1681         brelse(new_dir_bh);
1682
1683         if (status)
1684                 mlog_errno(status);
1685
1686         return status;
1687 }
1688
1689 /*
1690  * we expect i_size = strlen(symname). Copy symname into the file
1691  * data, including the null terminator.
1692  */
1693 static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
1694                                      handle_t *handle,
1695                                      struct inode *inode,
1696                                      const char *symname)
1697 {
1698         struct buffer_head **bhs = NULL;
1699         const char *c;
1700         struct super_block *sb = osb->sb;
1701         u64 p_blkno, p_blocks;
1702         int virtual, blocks, status, i, bytes_left;
1703
1704         bytes_left = i_size_read(inode) + 1;
1705         /* we can't trust i_blocks because we're actually going to
1706          * write i_size + 1 bytes. */
1707         blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
1708
1709         trace_ocfs2_create_symlink_data((unsigned long long)inode->i_blocks,
1710                                         i_size_read(inode), blocks);
1711
1712         /* Sanity check -- make sure we're going to fit. */
1713         if (bytes_left >
1714             ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
1715                 status = -EIO;
1716                 mlog_errno(status);
1717                 goto bail;
1718         }
1719
1720         bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
1721         if (!bhs) {
1722                 status = -ENOMEM;
1723                 mlog_errno(status);
1724                 goto bail;
1725         }
1726
1727         status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
1728                                              NULL);
1729         if (status < 0) {
1730                 mlog_errno(status);
1731                 goto bail;
1732         }
1733
1734         /* links can never be larger than one cluster so we know this
1735          * is all going to be contiguous, but do a sanity check
1736          * anyway. */
1737         if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
1738                 status = -EIO;
1739                 mlog_errno(status);
1740                 goto bail;
1741         }
1742
1743         virtual = 0;
1744         while(bytes_left > 0) {
1745                 c = &symname[virtual * sb->s_blocksize];
1746
1747                 bhs[virtual] = sb_getblk(sb, p_blkno);
1748                 if (!bhs[virtual]) {
1749                         status = -ENOMEM;
1750                         mlog_errno(status);
1751                         goto bail;
1752                 }
1753                 ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode),
1754                                               bhs[virtual]);
1755
1756                 status = ocfs2_journal_access(handle, INODE_CACHE(inode),
1757                                               bhs[virtual],
1758                                               OCFS2_JOURNAL_ACCESS_CREATE);
1759                 if (status < 0) {
1760                         mlog_errno(status);
1761                         goto bail;
1762                 }
1763
1764                 memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
1765
1766                 memcpy(bhs[virtual]->b_data, c,
1767                        (bytes_left > sb->s_blocksize) ? sb->s_blocksize :
1768                        bytes_left);
1769
1770                 ocfs2_journal_dirty(handle, bhs[virtual]);
1771
1772                 virtual++;
1773                 p_blkno++;
1774                 bytes_left -= sb->s_blocksize;
1775         }
1776
1777         status = 0;
1778 bail:
1779
1780         if (bhs) {
1781                 for(i = 0; i < blocks; i++)
1782                         brelse(bhs[i]);
1783                 kfree(bhs);
1784         }
1785
1786         if (status)
1787                 mlog_errno(status);
1788         return status;
1789 }
1790
1791 static int ocfs2_symlink(struct user_namespace *mnt_userns,
1792                          struct inode *dir,
1793                          struct dentry *dentry,
1794                          const char *symname)
1795 {
1796         int status, l, credits;
1797         u64 newsize;
1798         struct ocfs2_super *osb = NULL;
1799         struct inode *inode = NULL;
1800         struct super_block *sb;
1801         struct buffer_head *new_fe_bh = NULL;
1802         struct buffer_head *parent_fe_bh = NULL;
1803         struct ocfs2_dinode *fe = NULL;
1804         struct ocfs2_dinode *dirfe;
1805         handle_t *handle = NULL;
1806         struct ocfs2_alloc_context *inode_ac = NULL;
1807         struct ocfs2_alloc_context *data_ac = NULL;
1808         struct ocfs2_alloc_context *xattr_ac = NULL;
1809         int want_clusters = 0;
1810         int xattr_credits = 0;
1811         struct ocfs2_security_xattr_info si = {
1812                 .enable = 1,
1813         };
1814         int did_quota = 0, did_quota_inode = 0;
1815         struct ocfs2_dir_lookup_result lookup = { NULL, };
1816         sigset_t oldset;
1817         int did_block_signals = 0;
1818         struct ocfs2_dentry_lock *dl = NULL;
1819
1820         trace_ocfs2_symlink_begin(dir, dentry, symname,
1821                                   dentry->d_name.len, dentry->d_name.name);
1822
1823         status = dquot_initialize(dir);
1824         if (status) {
1825                 mlog_errno(status);
1826                 goto bail;
1827         }
1828
1829         sb = dir->i_sb;
1830         osb = OCFS2_SB(sb);
1831
1832         l = strlen(symname) + 1;
1833
1834         credits = ocfs2_calc_symlink_credits(sb);
1835
1836         /* lock the parent directory */
1837         status = ocfs2_inode_lock(dir, &parent_fe_bh, 1);
1838         if (status < 0) {
1839                 if (status != -ENOENT)
1840                         mlog_errno(status);
1841                 return status;
1842         }
1843
1844         dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
1845         if (!ocfs2_read_links_count(dirfe)) {
1846                 /* can't make a file in a deleted directory. */
1847                 status = -ENOENT;
1848                 goto bail;
1849         }
1850
1851         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
1852                                            dentry->d_name.len);
1853         if (status)
1854                 goto bail;
1855
1856         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
1857                                               dentry->d_name.name,
1858                                               dentry->d_name.len, &lookup);
1859         if (status < 0) {
1860                 mlog_errno(status);
1861                 goto bail;
1862         }
1863
1864         status = ocfs2_reserve_new_inode(osb, &inode_ac);
1865         if (status < 0) {
1866                 if (status != -ENOSPC)
1867                         mlog_errno(status);
1868                 goto bail;
1869         }
1870
1871         inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
1872         if (IS_ERR(inode)) {
1873                 status = PTR_ERR(inode);
1874                 inode = NULL;
1875                 mlog_errno(status);
1876                 goto bail;
1877         }
1878
1879         /* get security xattr */
1880         status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si);
1881         if (status) {
1882                 if (status == -EOPNOTSUPP)
1883                         si.enable = 0;
1884                 else {
1885                         mlog_errno(status);
1886                         goto bail;
1887                 }
1888         }
1889
1890         /* calculate meta data/clusters for setting security xattr */
1891         if (si.enable) {
1892                 status = ocfs2_calc_security_init(dir, &si, &want_clusters,
1893                                                   &xattr_credits, &xattr_ac);
1894                 if (status < 0) {
1895                         mlog_errno(status);
1896                         goto bail;
1897                 }
1898         }
1899
1900         /* don't reserve bitmap space for fast symlinks. */
1901         if (l > ocfs2_fast_symlink_chars(sb))
1902                 want_clusters += 1;
1903
1904         status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
1905         if (status < 0) {
1906                 if (status != -ENOSPC)
1907                         mlog_errno(status);
1908                 goto bail;
1909         }
1910
1911         handle = ocfs2_start_trans(osb, credits + xattr_credits);
1912         if (IS_ERR(handle)) {
1913                 status = PTR_ERR(handle);
1914                 handle = NULL;
1915                 mlog_errno(status);
1916                 goto bail;
1917         }
1918
1919         /* Starting to change things, restart is no longer possible. */
1920         ocfs2_block_signals(&oldset);
1921         did_block_signals = 1;
1922
1923         status = dquot_alloc_inode(inode);
1924         if (status)
1925                 goto bail;
1926         did_quota_inode = 1;
1927
1928         trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
1929                                    dentry->d_name.name,
1930                                    (unsigned long long)OCFS2_I(dir)->ip_blkno,
1931                                    inode->i_mode);
1932
1933         status = ocfs2_mknod_locked(osb, dir, inode,
1934                                     0, &new_fe_bh, parent_fe_bh, handle,
1935                                     inode_ac);
1936         if (status < 0) {
1937                 mlog_errno(status);
1938                 goto bail;
1939         }
1940
1941         fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
1942         inode->i_rdev = 0;
1943         newsize = l - 1;
1944         inode->i_op = &ocfs2_symlink_inode_operations;
1945         inode_nohighmem(inode);
1946         if (l > ocfs2_fast_symlink_chars(sb)) {
1947                 u32 offset = 0;
1948
1949                 status = dquot_alloc_space_nodirty(inode,
1950                     ocfs2_clusters_to_bytes(osb->sb, 1));
1951                 if (status)
1952                         goto bail;
1953                 did_quota = 1;
1954                 inode->i_mapping->a_ops = &ocfs2_aops;
1955                 status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
1956                                               new_fe_bh,
1957                                               handle, data_ac, NULL,
1958                                               NULL);
1959                 if (status < 0) {
1960                         if (status != -ENOSPC && status != -EINTR) {
1961                                 mlog(ML_ERROR,
1962                                      "Failed to extend file to %llu\n",
1963                                      (unsigned long long)newsize);
1964                                 mlog_errno(status);
1965                                 status = -ENOSPC;
1966                         }
1967                         goto bail;
1968                 }
1969                 i_size_write(inode, newsize);
1970                 inode->i_blocks = ocfs2_inode_sector_count(inode);
1971         } else {
1972                 inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
1973                 memcpy((char *) fe->id2.i_symlink, symname, l);
1974                 i_size_write(inode, newsize);
1975                 inode->i_blocks = 0;
1976         }
1977
1978         status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
1979         if (status < 0) {
1980                 mlog_errno(status);
1981                 goto bail;
1982         }
1983
1984         if (!ocfs2_inode_is_fast_symlink(inode)) {
1985                 status = ocfs2_create_symlink_data(osb, handle, inode,
1986                                                    symname);
1987                 if (status < 0) {
1988                         mlog_errno(status);
1989                         goto bail;
1990                 }
1991         }
1992
1993         if (si.enable) {
1994                 status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
1995                                                  xattr_ac, data_ac);
1996                 if (status < 0) {
1997                         mlog_errno(status);
1998                         goto bail;
1999                 }
2000         }
2001
2002         /*
2003          * Do this before adding the entry to the directory. We add
2004          * also set d_op after success so that ->d_iput() will cleanup
2005          * the dentry lock even if ocfs2_add_entry() fails below.
2006          */
2007         status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
2008         if (status) {
2009                 mlog_errno(status);
2010                 goto bail;
2011         }
2012
2013         dl = dentry->d_fsdata;
2014
2015         status = ocfs2_add_entry(handle, dentry, inode,
2016                                  le64_to_cpu(fe->i_blkno), parent_fe_bh,
2017                                  &lookup);
2018         if (status < 0) {
2019                 mlog_errno(status);
2020                 goto bail;
2021         }
2022
2023         insert_inode_hash(inode);
2024         d_instantiate(dentry, inode);
2025 bail:
2026         if (status < 0 && did_quota)
2027                 dquot_free_space_nodirty(inode,
2028                                         ocfs2_clusters_to_bytes(osb->sb, 1));
2029         if (status < 0 && did_quota_inode)
2030                 dquot_free_inode(inode);
2031         if (handle)
2032                 ocfs2_commit_trans(osb, handle);
2033
2034         ocfs2_inode_unlock(dir, 1);
2035         if (did_block_signals)
2036                 ocfs2_unblock_signals(&oldset);
2037
2038         brelse(new_fe_bh);
2039         brelse(parent_fe_bh);
2040         kfree(si.value);
2041         ocfs2_free_dir_lookup_result(&lookup);
2042         if (inode_ac)
2043                 ocfs2_free_alloc_context(inode_ac);
2044         if (data_ac)
2045                 ocfs2_free_alloc_context(data_ac);
2046         if (xattr_ac)
2047                 ocfs2_free_alloc_context(xattr_ac);
2048         if ((status < 0) && inode) {
2049                 if (dl)
2050                         ocfs2_cleanup_add_entry_failure(osb, dentry, inode);
2051
2052                 OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
2053                 clear_nlink(inode);
2054                 iput(inode);
2055         }
2056
2057         if (status)
2058                 mlog_errno(status);
2059
2060         return status;
2061 }
2062
2063 static int ocfs2_blkno_stringify(u64 blkno, char *name)
2064 {
2065         int status, namelen;
2066
2067         namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
2068                            (long long)blkno);
2069         if (namelen <= 0) {
2070                 if (namelen)
2071                         status = namelen;
2072                 else
2073                         status = -EINVAL;
2074                 mlog_errno(status);
2075                 goto bail;
2076         }
2077         if (namelen != OCFS2_ORPHAN_NAMELEN) {
2078                 status = -EINVAL;
2079                 mlog_errno(status);
2080                 goto bail;
2081         }
2082
2083         trace_ocfs2_blkno_stringify(blkno, name, namelen);
2084
2085         status = 0;
2086 bail:
2087         if (status < 0)
2088                 mlog_errno(status);
2089         return status;
2090 }
2091
2092 static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
2093                                         struct inode **ret_orphan_dir,
2094                                         struct buffer_head **ret_orphan_dir_bh)
2095 {
2096         struct inode *orphan_dir_inode;
2097         struct buffer_head *orphan_dir_bh = NULL;
2098         int ret = 0;
2099
2100         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2101                                                        ORPHAN_DIR_SYSTEM_INODE,
2102                                                        osb->slot_num);
2103         if (!orphan_dir_inode) {
2104                 ret = -ENOENT;
2105                 mlog_errno(ret);
2106                 return ret;
2107         }
2108
2109         inode_lock(orphan_dir_inode);
2110
2111         ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2112         if (ret < 0) {
2113                 inode_unlock(orphan_dir_inode);
2114                 iput(orphan_dir_inode);
2115
2116                 mlog_errno(ret);
2117                 return ret;
2118         }
2119
2120         *ret_orphan_dir = orphan_dir_inode;
2121         *ret_orphan_dir_bh = orphan_dir_bh;
2122
2123         return 0;
2124 }
2125
2126 static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
2127                                       struct buffer_head *orphan_dir_bh,
2128                                       u64 blkno,
2129                                       char *name,
2130                                       struct ocfs2_dir_lookup_result *lookup,
2131                                       bool dio)
2132 {
2133         int ret;
2134         struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
2135         int namelen = dio ?
2136                         (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
2137                         OCFS2_ORPHAN_NAMELEN;
2138
2139         if (dio) {
2140                 ret = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
2141                                 OCFS2_DIO_ORPHAN_PREFIX);
2142                 if (ret != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
2143                         ret = -EINVAL;
2144                         mlog_errno(ret);
2145                         return ret;
2146                 }
2147
2148                 ret = ocfs2_blkno_stringify(blkno,
2149                                 name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
2150         } else
2151                 ret = ocfs2_blkno_stringify(blkno, name);
2152         if (ret < 0) {
2153                 mlog_errno(ret);
2154                 return ret;
2155         }
2156
2157         ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
2158                                            orphan_dir_bh, name,
2159                                            namelen, lookup);
2160         if (ret < 0) {
2161                 mlog_errno(ret);
2162                 return ret;
2163         }
2164
2165         return 0;
2166 }
2167
2168 /**
2169  * ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
2170  * insertion of an orphan.
2171  * @osb: ocfs2 file system
2172  * @ret_orphan_dir: Orphan dir inode - returned locked!
2173  * @blkno: Actual block number of the inode to be inserted into orphan dir.
2174  * @lookup: dir lookup result, to be passed back into functions like
2175  *          ocfs2_orphan_add
2176  *
2177  * Returns zero on success and the ret_orphan_dir, name and lookup
2178  * fields will be populated.
2179  *
2180  * Returns non-zero on failure.
2181  */
2182 static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
2183                                     struct inode **ret_orphan_dir,
2184                                     u64 blkno,
2185                                     char *name,
2186                                     struct ocfs2_dir_lookup_result *lookup,
2187                                     bool dio)
2188 {
2189         struct inode *orphan_dir_inode = NULL;
2190         struct buffer_head *orphan_dir_bh = NULL;
2191         int ret = 0;
2192
2193         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
2194                                            &orphan_dir_bh);
2195         if (ret < 0) {
2196                 mlog_errno(ret);
2197                 return ret;
2198         }
2199
2200         ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
2201                                          blkno, name, lookup, dio);
2202         if (ret < 0) {
2203                 mlog_errno(ret);
2204                 goto out;
2205         }
2206
2207         *ret_orphan_dir = orphan_dir_inode;
2208
2209 out:
2210         brelse(orphan_dir_bh);
2211
2212         if (ret) {
2213                 ocfs2_inode_unlock(orphan_dir_inode, 1);
2214                 inode_unlock(orphan_dir_inode);
2215                 iput(orphan_dir_inode);
2216         }
2217
2218         if (ret)
2219                 mlog_errno(ret);
2220         return ret;
2221 }
2222
2223 static int ocfs2_orphan_add(struct ocfs2_super *osb,
2224                             handle_t *handle,
2225                             struct inode *inode,
2226                             struct buffer_head *fe_bh,
2227                             char *name,
2228                             struct ocfs2_dir_lookup_result *lookup,
2229                             struct inode *orphan_dir_inode,
2230                             bool dio)
2231 {
2232         struct buffer_head *orphan_dir_bh = NULL;
2233         int status = 0;
2234         struct ocfs2_dinode *orphan_fe;
2235         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
2236         int namelen = dio ?
2237                         (OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
2238                         OCFS2_ORPHAN_NAMELEN;
2239
2240         trace_ocfs2_orphan_add_begin(
2241                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2242
2243         status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
2244         if (status < 0) {
2245                 mlog_errno(status);
2246                 goto leave;
2247         }
2248
2249         status = ocfs2_journal_access_di(handle,
2250                                          INODE_CACHE(orphan_dir_inode),
2251                                          orphan_dir_bh,
2252                                          OCFS2_JOURNAL_ACCESS_WRITE);
2253         if (status < 0) {
2254                 mlog_errno(status);
2255                 goto leave;
2256         }
2257
2258         /*
2259          * We're going to journal the change of i_flags and i_orphaned_slot.
2260          * It's safe anyway, though some callers may duplicate the journaling.
2261          * Journaling within the func just make the logic look more
2262          * straightforward.
2263          */
2264         status = ocfs2_journal_access_di(handle,
2265                                          INODE_CACHE(inode),
2266                                          fe_bh,
2267                                          OCFS2_JOURNAL_ACCESS_WRITE);
2268         if (status < 0) {
2269                 mlog_errno(status);
2270                 goto leave;
2271         }
2272
2273         /* we're a cluster, and nlink can change on disk from
2274          * underneath us... */
2275         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2276         if (S_ISDIR(inode->i_mode))
2277                 ocfs2_add_links_count(orphan_fe, 1);
2278         set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2279         ocfs2_journal_dirty(handle, orphan_dir_bh);
2280
2281         status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
2282                                    namelen, inode,
2283                                    OCFS2_I(inode)->ip_blkno,
2284                                    orphan_dir_bh, lookup);
2285         if (status < 0) {
2286                 mlog_errno(status);
2287                 goto rollback;
2288         }
2289
2290         if (dio) {
2291                 /* Update flag OCFS2_DIO_ORPHANED_FL and record the orphan
2292                  * slot.
2293                  */
2294                 fe->i_flags |= cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
2295                 fe->i_dio_orphaned_slot = cpu_to_le16(osb->slot_num);
2296         } else {
2297                 fe->i_flags |= cpu_to_le32(OCFS2_ORPHANED_FL);
2298                 OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
2299
2300                 /* Record which orphan dir our inode now resides
2301                  * in. delete_inode will use this to determine which orphan
2302                  * dir to lock. */
2303                 fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
2304         }
2305
2306         ocfs2_journal_dirty(handle, fe_bh);
2307
2308         trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
2309                                    osb->slot_num);
2310
2311 rollback:
2312         if (status < 0) {
2313                 if (S_ISDIR(inode->i_mode))
2314                         ocfs2_add_links_count(orphan_fe, -1);
2315                 set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2316         }
2317
2318 leave:
2319         brelse(orphan_dir_bh);
2320
2321         return status;
2322 }
2323
2324 /* unlike orphan_add, we expect the orphan dir to already be locked here. */
2325 int ocfs2_orphan_del(struct ocfs2_super *osb,
2326                      handle_t *handle,
2327                      struct inode *orphan_dir_inode,
2328                      struct inode *inode,
2329                      struct buffer_head *orphan_dir_bh,
2330                      bool dio)
2331 {
2332         char name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
2333         struct ocfs2_dinode *orphan_fe;
2334         int status = 0;
2335         struct ocfs2_dir_lookup_result lookup = { NULL, };
2336
2337         if (dio) {
2338                 status = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
2339                                 OCFS2_DIO_ORPHAN_PREFIX);
2340                 if (status != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
2341                         status = -EINVAL;
2342                         mlog_errno(status);
2343                         return status;
2344                 }
2345
2346                 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno,
2347                                 name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
2348         } else
2349                 status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
2350         if (status < 0) {
2351                 mlog_errno(status);
2352                 goto leave;
2353         }
2354
2355         trace_ocfs2_orphan_del(
2356              (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
2357              name, strlen(name));
2358
2359         status = ocfs2_journal_access_di(handle,
2360                                          INODE_CACHE(orphan_dir_inode),
2361                                          orphan_dir_bh,
2362                                          OCFS2_JOURNAL_ACCESS_WRITE);
2363         if (status < 0) {
2364                 mlog_errno(status);
2365                 goto leave;
2366         }
2367
2368         /* find it's spot in the orphan directory */
2369         status = ocfs2_find_entry(name, strlen(name), orphan_dir_inode,
2370                                   &lookup);
2371         if (status) {
2372                 mlog_errno(status);
2373                 goto leave;
2374         }
2375
2376         /* remove it from the orphan directory */
2377         status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
2378         if (status < 0) {
2379                 mlog_errno(status);
2380                 goto leave;
2381         }
2382
2383         /* do the i_nlink dance! :) */
2384         orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
2385         if (S_ISDIR(inode->i_mode))
2386                 ocfs2_add_links_count(orphan_fe, -1);
2387         set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
2388         ocfs2_journal_dirty(handle, orphan_dir_bh);
2389
2390 leave:
2391         ocfs2_free_dir_lookup_result(&lookup);
2392
2393         if (status)
2394                 mlog_errno(status);
2395         return status;
2396 }
2397
2398 /**
2399  * ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
2400  * allocated file. This is different from the typical 'add to orphan dir'
2401  * operation in that the inode does not yet exist. This is a problem because
2402  * the orphan dir stringifies the inode block number to come up with it's
2403  * dirent. Obviously if the inode does not yet exist we have a chicken and egg
2404  * problem. This function works around it by calling deeper into the orphan
2405  * and suballoc code than other callers. Use this only by necessity.
2406  * @dir: The directory which this inode will ultimately wind up under - not the
2407  * orphan dir!
2408  * @dir_bh: buffer_head the @dir inode block
2409  * @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
2410  * with the string to be used for orphan dirent. Pass back to the orphan dir
2411  * code.
2412  * @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
2413  * dir code.
2414  * @ret_di_blkno: block number where the new inode will be allocated.
2415  * @orphan_insert: Dir insert context to be passed back into orphan dir code.
2416  * @ret_inode_ac: Inode alloc context to be passed back to the allocator.
2417  *
2418  * Returns zero on success and the ret_orphan_dir, name and lookup
2419  * fields will be populated.
2420  *
2421  * Returns non-zero on failure.
2422  */
2423 static int ocfs2_prep_new_orphaned_file(struct inode *dir,
2424                                         struct buffer_head *dir_bh,
2425                                         char *orphan_name,
2426                                         struct inode **ret_orphan_dir,
2427                                         u64 *ret_di_blkno,
2428                                         struct ocfs2_dir_lookup_result *orphan_insert,
2429                                         struct ocfs2_alloc_context **ret_inode_ac)
2430 {
2431         int ret;
2432         u64 di_blkno;
2433         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2434         struct inode *orphan_dir = NULL;
2435         struct buffer_head *orphan_dir_bh = NULL;
2436         struct ocfs2_alloc_context *inode_ac = NULL;
2437
2438         ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
2439         if (ret < 0) {
2440                 mlog_errno(ret);
2441                 return ret;
2442         }
2443
2444         /* reserve an inode spot */
2445         ret = ocfs2_reserve_new_inode(osb, &inode_ac);
2446         if (ret < 0) {
2447                 if (ret != -ENOSPC)
2448                         mlog_errno(ret);
2449                 goto out;
2450         }
2451
2452         ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
2453                                        &di_blkno);
2454         if (ret) {
2455                 mlog_errno(ret);
2456                 goto out;
2457         }
2458
2459         ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
2460                                          di_blkno, orphan_name, orphan_insert,
2461                                          false);
2462         if (ret < 0) {
2463                 mlog_errno(ret);
2464                 goto out;
2465         }
2466
2467 out:
2468         if (ret == 0) {
2469                 *ret_orphan_dir = orphan_dir;
2470                 *ret_di_blkno = di_blkno;
2471                 *ret_inode_ac = inode_ac;
2472                 /*
2473                  * orphan_name and orphan_insert are already up to
2474                  * date via prepare_orphan_dir
2475                  */
2476         } else {
2477                 /* Unroll reserve_new_inode* */
2478                 if (inode_ac)
2479                         ocfs2_free_alloc_context(inode_ac);
2480
2481                 /* Unroll orphan dir locking */
2482                 inode_unlock(orphan_dir);
2483                 ocfs2_inode_unlock(orphan_dir, 1);
2484                 iput(orphan_dir);
2485         }
2486
2487         brelse(orphan_dir_bh);
2488
2489         return ret;
2490 }
2491
2492 int ocfs2_create_inode_in_orphan(struct inode *dir,
2493                                  int mode,
2494                                  struct inode **new_inode)
2495 {
2496         int status, did_quota_inode = 0;
2497         struct inode *inode = NULL;
2498         struct inode *orphan_dir = NULL;
2499         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2500         handle_t *handle = NULL;
2501         char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
2502         struct buffer_head *parent_di_bh = NULL;
2503         struct buffer_head *new_di_bh = NULL;
2504         struct ocfs2_alloc_context *inode_ac = NULL;
2505         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2506         u64 di_blkno, suballoc_loc;
2507         u16 suballoc_bit;
2508
2509         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2510         if (status < 0) {
2511                 if (status != -ENOENT)
2512                         mlog_errno(status);
2513                 return status;
2514         }
2515
2516         status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
2517                                               orphan_name, &orphan_dir,
2518                                               &di_blkno, &orphan_insert, &inode_ac);
2519         if (status < 0) {
2520                 if (status != -ENOSPC)
2521                         mlog_errno(status);
2522                 goto leave;
2523         }
2524
2525         inode = ocfs2_get_init_inode(dir, mode);
2526         if (IS_ERR(inode)) {
2527                 status = PTR_ERR(inode);
2528                 inode = NULL;
2529                 mlog_errno(status);
2530                 goto leave;
2531         }
2532
2533         handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
2534         if (IS_ERR(handle)) {
2535                 status = PTR_ERR(handle);
2536                 handle = NULL;
2537                 mlog_errno(status);
2538                 goto leave;
2539         }
2540
2541         status = dquot_alloc_inode(inode);
2542         if (status)
2543                 goto leave;
2544         did_quota_inode = 1;
2545
2546         status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
2547                                               &suballoc_loc,
2548                                               &suballoc_bit, di_blkno);
2549         if (status < 0) {
2550                 mlog_errno(status);
2551                 goto leave;
2552         }
2553
2554         clear_nlink(inode);
2555         /* do the real work now. */
2556         status = __ocfs2_mknod_locked(dir, inode,
2557                                       0, &new_di_bh, parent_di_bh, handle,
2558                                       inode_ac, di_blkno, suballoc_loc,
2559                                       suballoc_bit);
2560         if (status < 0) {
2561                 mlog_errno(status);
2562                 goto leave;
2563         }
2564
2565         status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
2566                                   &orphan_insert, orphan_dir, false);
2567         if (status < 0) {
2568                 mlog_errno(status);
2569                 goto leave;
2570         }
2571
2572         /* get open lock so that only nodes can't remove it from orphan dir. */
2573         status = ocfs2_open_lock(inode);
2574         if (status < 0)
2575                 mlog_errno(status);
2576
2577         insert_inode_hash(inode);
2578 leave:
2579         if (status < 0 && did_quota_inode)
2580                 dquot_free_inode(inode);
2581         if (handle)
2582                 ocfs2_commit_trans(osb, handle);
2583
2584         if (orphan_dir) {
2585                 /* This was locked for us in ocfs2_prepare_orphan_dir() */
2586                 ocfs2_inode_unlock(orphan_dir, 1);
2587                 inode_unlock(orphan_dir);
2588                 iput(orphan_dir);
2589         }
2590
2591         if ((status < 0) && inode) {
2592                 clear_nlink(inode);
2593                 iput(inode);
2594         }
2595
2596         if (inode_ac)
2597                 ocfs2_free_alloc_context(inode_ac);
2598
2599         brelse(new_di_bh);
2600
2601         if (!status)
2602                 *new_inode = inode;
2603
2604         ocfs2_free_dir_lookup_result(&orphan_insert);
2605
2606         ocfs2_inode_unlock(dir, 1);
2607         brelse(parent_di_bh);
2608         return status;
2609 }
2610
2611 int ocfs2_add_inode_to_orphan(struct ocfs2_super *osb,
2612         struct inode *inode)
2613 {
2614         char orphan_name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
2615         struct inode *orphan_dir_inode = NULL;
2616         struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
2617         struct buffer_head *di_bh = NULL;
2618         int status = 0;
2619         handle_t *handle = NULL;
2620         struct ocfs2_dinode *di = NULL;
2621
2622         status = ocfs2_inode_lock(inode, &di_bh, 1);
2623         if (status < 0) {
2624                 mlog_errno(status);
2625                 goto bail;
2626         }
2627
2628         di = (struct ocfs2_dinode *) di_bh->b_data;
2629         /*
2630          * Another append dio crashed?
2631          * If so, manually recover it first.
2632          */
2633         if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
2634                 status = ocfs2_truncate_file(inode, di_bh, i_size_read(inode));
2635                 if (status < 0) {
2636                         if (status != -ENOSPC)
2637                                 mlog_errno(status);
2638                         goto bail_unlock_inode;
2639                 }
2640
2641                 status = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
2642                 if (status < 0) {
2643                         mlog_errno(status);
2644                         goto bail_unlock_inode;
2645                 }
2646         }
2647
2648         status = ocfs2_prepare_orphan_dir(osb, &orphan_dir_inode,
2649                         OCFS2_I(inode)->ip_blkno,
2650                         orphan_name,
2651                         &orphan_insert,
2652                         true);
2653         if (status < 0) {
2654                 mlog_errno(status);
2655                 goto bail_unlock_inode;
2656         }
2657
2658         handle = ocfs2_start_trans(osb,
2659                         OCFS2_INODE_ADD_TO_ORPHAN_CREDITS);
2660         if (IS_ERR(handle)) {
2661                 status = PTR_ERR(handle);
2662                 goto bail_unlock_orphan;
2663         }
2664
2665         status = ocfs2_orphan_add(osb, handle, inode, di_bh, orphan_name,
2666                         &orphan_insert, orphan_dir_inode, true);
2667         if (status)
2668                 mlog_errno(status);
2669
2670         ocfs2_commit_trans(osb, handle);
2671
2672 bail_unlock_orphan:
2673         ocfs2_inode_unlock(orphan_dir_inode, 1);
2674         inode_unlock(orphan_dir_inode);
2675         iput(orphan_dir_inode);
2676
2677         ocfs2_free_dir_lookup_result(&orphan_insert);
2678
2679 bail_unlock_inode:
2680         ocfs2_inode_unlock(inode, 1);
2681         brelse(di_bh);
2682
2683 bail:
2684         return status;
2685 }
2686
2687 int ocfs2_del_inode_from_orphan(struct ocfs2_super *osb,
2688                 struct inode *inode, struct buffer_head *di_bh,
2689                 int update_isize, loff_t end)
2690 {
2691         struct inode *orphan_dir_inode = NULL;
2692         struct buffer_head *orphan_dir_bh = NULL;
2693         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2694         handle_t *handle = NULL;
2695         int status = 0;
2696
2697         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2698                         ORPHAN_DIR_SYSTEM_INODE,
2699                         le16_to_cpu(di->i_dio_orphaned_slot));
2700         if (!orphan_dir_inode) {
2701                 status = -ENOENT;
2702                 mlog_errno(status);
2703                 goto bail;
2704         }
2705
2706         inode_lock(orphan_dir_inode);
2707         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2708         if (status < 0) {
2709                 inode_unlock(orphan_dir_inode);
2710                 iput(orphan_dir_inode);
2711                 mlog_errno(status);
2712                 goto bail;
2713         }
2714
2715         handle = ocfs2_start_trans(osb,
2716                         OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS);
2717         if (IS_ERR(handle)) {
2718                 status = PTR_ERR(handle);
2719                 goto bail_unlock_orphan;
2720         }
2721
2722         BUG_ON(!(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)));
2723
2724         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode,
2725                                 inode, orphan_dir_bh, true);
2726         if (status < 0) {
2727                 mlog_errno(status);
2728                 goto bail_commit;
2729         }
2730
2731         status = ocfs2_journal_access_di(handle,
2732                         INODE_CACHE(inode),
2733                         di_bh,
2734                         OCFS2_JOURNAL_ACCESS_WRITE);
2735         if (status < 0) {
2736                 mlog_errno(status);
2737                 goto bail_commit;
2738         }
2739
2740         di->i_flags &= ~cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
2741         di->i_dio_orphaned_slot = 0;
2742
2743         if (update_isize) {
2744                 status = ocfs2_set_inode_size(handle, inode, di_bh, end);
2745                 if (status)
2746                         mlog_errno(status);
2747         } else
2748                 ocfs2_journal_dirty(handle, di_bh);
2749
2750 bail_commit:
2751         ocfs2_commit_trans(osb, handle);
2752
2753 bail_unlock_orphan:
2754         ocfs2_inode_unlock(orphan_dir_inode, 1);
2755         inode_unlock(orphan_dir_inode);
2756         brelse(orphan_dir_bh);
2757         iput(orphan_dir_inode);
2758
2759 bail:
2760         return status;
2761 }
2762
2763 int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
2764                                    struct inode *inode,
2765                                    struct dentry *dentry)
2766 {
2767         int status = 0;
2768         struct buffer_head *parent_di_bh = NULL;
2769         handle_t *handle = NULL;
2770         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
2771         struct ocfs2_dinode *dir_di, *di;
2772         struct inode *orphan_dir_inode = NULL;
2773         struct buffer_head *orphan_dir_bh = NULL;
2774         struct buffer_head *di_bh = NULL;
2775         struct ocfs2_dir_lookup_result lookup = { NULL, };
2776
2777         trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
2778                                 dentry->d_name.len, dentry->d_name.name,
2779                                 (unsigned long long)OCFS2_I(dir)->ip_blkno,
2780                                 (unsigned long long)OCFS2_I(inode)->ip_blkno);
2781
2782         status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
2783         if (status < 0) {
2784                 if (status != -ENOENT)
2785                         mlog_errno(status);
2786                 return status;
2787         }
2788
2789         dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
2790         if (!dir_di->i_links_count) {
2791                 /* can't make a file in a deleted directory. */
2792                 status = -ENOENT;
2793                 goto leave;
2794         }
2795
2796         status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
2797                                            dentry->d_name.len);
2798         if (status)
2799                 goto leave;
2800
2801         /* get a spot inside the dir. */
2802         status = ocfs2_prepare_dir_for_insert(osb, dir, parent_di_bh,
2803                                               dentry->d_name.name,
2804                                               dentry->d_name.len, &lookup);
2805         if (status < 0) {
2806                 mlog_errno(status);
2807                 goto leave;
2808         }
2809
2810         orphan_dir_inode = ocfs2_get_system_file_inode(osb,
2811                                                        ORPHAN_DIR_SYSTEM_INODE,
2812                                                        osb->slot_num);
2813         if (!orphan_dir_inode) {
2814                 status = -ENOENT;
2815                 mlog_errno(status);
2816                 goto leave;
2817         }
2818
2819         inode_lock(orphan_dir_inode);
2820
2821         status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
2822         if (status < 0) {
2823                 mlog_errno(status);
2824                 inode_unlock(orphan_dir_inode);
2825                 iput(orphan_dir_inode);
2826                 goto leave;
2827         }
2828
2829         status = ocfs2_read_inode_block(inode, &di_bh);
2830         if (status < 0) {
2831                 mlog_errno(status);
2832                 goto orphan_unlock;
2833         }
2834
2835         handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
2836         if (IS_ERR(handle)) {
2837                 status = PTR_ERR(handle);
2838                 handle = NULL;
2839                 mlog_errno(status);
2840                 goto orphan_unlock;
2841         }
2842
2843         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
2844                                          di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
2845         if (status < 0) {
2846                 mlog_errno(status);
2847                 goto out_commit;
2848         }
2849
2850         status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
2851                                   orphan_dir_bh, false);
2852         if (status < 0) {
2853                 mlog_errno(status);
2854                 goto out_commit;
2855         }
2856
2857         di = (struct ocfs2_dinode *)di_bh->b_data;
2858         di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
2859         di->i_orphaned_slot = 0;
2860         set_nlink(inode, 1);
2861         ocfs2_set_links_count(di, inode->i_nlink);
2862         ocfs2_update_inode_fsync_trans(handle, inode, 1);
2863         ocfs2_journal_dirty(handle, di_bh);
2864
2865         status = ocfs2_add_entry(handle, dentry, inode,
2866                                  OCFS2_I(inode)->ip_blkno, parent_di_bh,
2867                                  &lookup);
2868         if (status < 0) {
2869                 mlog_errno(status);
2870                 goto out_commit;
2871         }
2872
2873         status = ocfs2_dentry_attach_lock(dentry, inode,
2874                                           OCFS2_I(dir)->ip_blkno);
2875         if (status) {
2876                 mlog_errno(status);
2877                 goto out_commit;
2878         }
2879
2880         d_instantiate(dentry, inode);
2881         status = 0;
2882 out_commit:
2883         ocfs2_commit_trans(osb, handle);
2884 orphan_unlock:
2885         ocfs2_inode_unlock(orphan_dir_inode, 1);
2886         inode_unlock(orphan_dir_inode);
2887         iput(orphan_dir_inode);
2888 leave:
2889
2890         ocfs2_inode_unlock(dir, 1);
2891
2892         brelse(di_bh);
2893         brelse(parent_di_bh);
2894         brelse(orphan_dir_bh);
2895
2896         ocfs2_free_dir_lookup_result(&lookup);
2897
2898         if (status)
2899                 mlog_errno(status);
2900
2901         return status;
2902 }
2903
2904 const struct inode_operations ocfs2_dir_iops = {
2905         .create         = ocfs2_create,
2906         .lookup         = ocfs2_lookup,
2907         .link           = ocfs2_link,
2908         .unlink         = ocfs2_unlink,
2909         .rmdir          = ocfs2_unlink,
2910         .symlink        = ocfs2_symlink,
2911         .mkdir          = ocfs2_mkdir,
2912         .mknod          = ocfs2_mknod,
2913         .rename         = ocfs2_rename,
2914         .setattr        = ocfs2_setattr,
2915         .getattr        = ocfs2_getattr,
2916         .permission     = ocfs2_permission,
2917         .listxattr      = ocfs2_listxattr,
2918         .fiemap         = ocfs2_fiemap,
2919         .get_acl        = ocfs2_iop_get_acl,
2920         .set_acl        = ocfs2_iop_set_acl,
2921 };