fs/ext4/super.c

   1 /*
   2  *  linux/fs/ext4/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd2.h>
  24 #include <linux/slab.h>
  25 #include <linux/init.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/parser.h>
  28 #include <linux/smp_lock.h>
  29 #include <linux/buffer_head.h>
  30 #include <linux/exportfs.h>
  31 #include <linux/vfs.h>
  32 #include <linux/random.h>
  33 #include <linux/mount.h>
  34 #include <linux/namei.h>
  35 #include <linux/quotaops.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/log2.h>
  38 #include <linux/crc16.h>
  39 #include <asm/uaccess.h>
  40
  41 #include "ext4.h"
  42 #include "ext4_jbd2.h"
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46 #include "group.h"
  47
  48 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  49                              unsigned long journal_devnum);
  50 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
  51                                unsigned int);
  52 static void ext4_commit_super (struct super_block * sb,
  53                                struct ext4_super_block * es,
  54                                int sync);
  55 static void ext4_mark_recovery_complete(struct super_block * sb,
  56                                         struct ext4_super_block * es);
  57 static void ext4_clear_journal_err(struct super_block * sb,
  58                                    struct ext4_super_block * es);
  59 static int ext4_sync_fs(struct super_block *sb, int wait);
  60 static const char *ext4_decode_error(struct super_block * sb, int errno,
  61                                      char nbuf[16]);
  62 static int ext4_remount (struct super_block * sb, int * flags, char * data);
  63 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
  64 static void ext4_unlockfs(struct super_block *sb);
  65 static void ext4_write_super (struct super_block * sb);
  66 static void ext4_write_super_lockfs(struct super_block *sb);
  67
  68
  69 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
  70                                struct ext4_group_desc *bg)
  71 {
  72         return le32_to_cpu(bg->bg_block_bitmap_lo) |
  73                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
  74                 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
  75 }
  76
  77 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
  78                                struct ext4_group_desc *bg)
  79 {
  80         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
  81                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
  82                 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
  83 }
  84
  85 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
  86                               struct ext4_group_desc *bg)
  87 {
  88         return le32_to_cpu(bg->bg_inode_table_lo) |
  89                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
  90                 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
  91 }
  92
  93 void ext4_block_bitmap_set(struct super_block *sb,
  94                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
  95 {
  96         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
  97         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
  98                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
  99 }
 100
 101 void ext4_inode_bitmap_set(struct super_block *sb,
 102                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 103 {
 104         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 105         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 106                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 107 }
 108
 109 void ext4_inode_table_set(struct super_block *sb,
 110                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
 111 {
 112         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 113         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 114                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 115 }
 116
 117 /*
 118  * Wrappers for jbd2_journal_start/end.
 119  *
 120  * The only special thing we need to do here is to make sure that all
 121  * journal_end calls result in the superblock being marked dirty, so
 122  * that sync() will call the filesystem's write_super callback if
 123  * appropriate.
 124  */
 125 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
 126 {
 127         journal_t *journal;
 128
 129         if (sb->s_flags & MS_RDONLY)
 130                 return ERR_PTR(-EROFS);
 131
 132         /* Special case here: if the journal has aborted behind our
 133          * backs (eg. EIO in the commit thread), then we still need to
 134          * take the FS itself readonly cleanly. */
 135         journal = EXT4_SB(sb)->s_journal;
 136         if (is_journal_aborted(journal)) {
 137                 ext4_abort(sb, __func__,
 138                            "Detected aborted journal");
 139                 return ERR_PTR(-EROFS);
 140         }
 141
 142         return jbd2_journal_start(journal, nblocks);
 143 }
 144
 145 /*
 146  * The only special thing we need to do here is to make sure that all
 147  * jbd2_journal_stop calls result in the superblock being marked dirty, so
 148  * that sync() will call the filesystem's write_super callback if
 149  * appropriate.
 150  */
 151 int __ext4_journal_stop(const char *where, handle_t *handle)
 152 {
 153         struct super_block *sb;
 154         int err;
 155         int rc;
 156
 157         sb = handle->h_transaction->t_journal->j_private;
 158         err = handle->h_err;
 159         rc = jbd2_journal_stop(handle);
 160
 161         if (!err)
 162                 err = rc;
 163         if (err)
 164                 __ext4_std_error(sb, where, err);
 165         return err;
 166 }
 167
 168 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
 169                 struct buffer_head *bh, handle_t *handle, int err)
 170 {
 171         char nbuf[16];
 172         const char *errstr = ext4_decode_error(NULL, err, nbuf);
 173
 174         if (bh)
 175                 BUFFER_TRACE(bh, "abort");
 176
 177         if (!handle->h_err)
 178                 handle->h_err = err;
 179
 180         if (is_handle_aborted(handle))
 181                 return;
 182
 183         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 184                caller, errstr, err_fn);
 185
 186         jbd2_journal_abort_handle(handle);
 187 }
 188
 189 /* Deal with the reporting of failure conditions on a filesystem such as
 190  * inconsistencies detected or read IO failures.
 191  *
 192  * On ext2, we can store the error state of the filesystem in the
 193  * superblock.  That is not possible on ext4, because we may have other
 194  * write ordering constraints on the superblock which prevent us from
 195  * writing it out straight away; and given that the journal is about to
 196  * be aborted, we can't rely on the current, or future, transactions to
 197  * write out the superblock safely.
 198  *
 199  * We'll just use the jbd2_journal_abort() error code to record an error in
 200  * the journal instead.  On recovery, the journal will compain about
 201  * that error until we've noted it down and cleared it.
 202  */
 203
 204 static void ext4_handle_error(struct super_block *sb)
 205 {
 206         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 207
 208         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 209         es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
 210
 211         if (sb->s_flags & MS_RDONLY)
 212                 return;
 213
 214         if (!test_opt (sb, ERRORS_CONT)) {
 215                 journal_t *journal = EXT4_SB(sb)->s_journal;
 216
 217                 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
 218                 if (journal)
 219                         jbd2_journal_abort(journal, -EIO);
 220         }
 221         if (test_opt (sb, ERRORS_RO)) {
 222                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 223                 sb->s_flags |= MS_RDONLY;
 224         }
 225         ext4_commit_super(sb, es, 1);
 226         if (test_opt(sb, ERRORS_PANIC))
 227                 panic("EXT4-fs (device %s): panic forced after error\n",
 228                         sb->s_id);
 229 }
 230
 231 void ext4_error (struct super_block * sb, const char * function,
 232                  const char * fmt, ...)
 233 {
 234         va_list args;
 235
 236         va_start(args, fmt);
 237         printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
 238         vprintk(fmt, args);
 239         printk("\n");
 240         va_end(args);
 241
 242         ext4_handle_error(sb);
 243 }
 244
 245 static const char *ext4_decode_error(struct super_block * sb, int errno,
 246                                      char nbuf[16])
 247 {
 248         char *errstr = NULL;
 249
 250         switch (errno) {
 251         case -EIO:
 252                 errstr = "IO failure";
 253                 break;
 254         case -ENOMEM:
 255                 errstr = "Out of memory";
 256                 break;
 257         case -EROFS:
 258                 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
 259                         errstr = "Journal has aborted";
 260                 else
 261                         errstr = "Readonly filesystem";
 262                 break;
 263         default:
 264                 /* If the caller passed in an extra buffer for unknown
 265                  * errors, textualise them now.  Else we just return
 266                  * NULL. */
 267                 if (nbuf) {
 268                         /* Check for truncated error codes... */
 269                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 270                                 errstr = nbuf;
 271                 }
 272                 break;
 273         }
 274
 275         return errstr;
 276 }
 277
 278 /* __ext4_std_error decodes expected errors from journaling functions
 279  * automatically and invokes the appropriate error response.  */
 280
 281 void __ext4_std_error (struct super_block * sb, const char * function,
 282                        int errno)
 283 {
 284         char nbuf[16];
 285         const char *errstr;
 286
 287         /* Special case: if the error is EROFS, and we're not already
 288          * inside a transaction, then there's really no point in logging
 289          * an error. */
 290         if (errno == -EROFS && journal_current_handle() == NULL &&
 291             (sb->s_flags & MS_RDONLY))
 292                 return;
 293
 294         errstr = ext4_decode_error(sb, errno, nbuf);
 295         printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
 296                 sb->s_id, function, errstr);
 297
 298         ext4_handle_error(sb);
 299 }
 300
 301 /*
 302  * ext4_abort is a much stronger failure handler than ext4_error.  The
 303  * abort function may be used to deal with unrecoverable failures such
 304  * as journal IO errors or ENOMEM at a critical moment in log management.
 305  *
 306  * We unconditionally force the filesystem into an ABORT|READONLY state,
 307  * unless the error response on the fs has been set to panic in which
 308  * case we take the easy way out and panic immediately.
 309  */
 310
 311 void ext4_abort (struct super_block * sb, const char * function,
 312                  const char * fmt, ...)
 313 {
 314         va_list args;
 315
 316         printk (KERN_CRIT "ext4_abort called.\n");
 317
 318         va_start(args, fmt);
 319         printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
 320         vprintk(fmt, args);
 321         printk("\n");
 322         va_end(args);
 323
 324         if (test_opt(sb, ERRORS_PANIC))
 325                 panic("EXT4-fs panic from previous error\n");
 326
 327         if (sb->s_flags & MS_RDONLY)
 328                 return;
 329
 330         printk(KERN_CRIT "Remounting filesystem read-only\n");
 331         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 332         sb->s_flags |= MS_RDONLY;
 333         EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
 334         jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
 335 }
 336
 337 void ext4_warning (struct super_block * sb, const char * function,
 338                    const char * fmt, ...)
 339 {
 340         va_list args;
 341
 342         va_start(args, fmt);
 343         printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
 344                sb->s_id, function);
 345         vprintk(fmt, args);
 346         printk("\n");
 347         va_end(args);
 348 }
 349
 350 void ext4_update_dynamic_rev(struct super_block *sb)
 351 {
 352         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 353
 354         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
 355                 return;
 356
 357         ext4_warning(sb, __func__,
 358                      "updating to rev %d because of new feature flag, "
 359                      "running e2fsck is recommended",
 360                      EXT4_DYNAMIC_REV);
 361
 362         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
 363         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
 364         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
 365         /* leave es->s_feature_*compat flags alone */
 366         /* es->s_uuid will be set by e2fsck if empty */
 367
 368         /*
 369          * The rest of the superblock fields should be zero, and if not it
 370          * means they are likely already in use, so leave them alone.  We
 371          * can leave it up to e2fsck to clean up any inconsistencies there.
 372          */
 373 }
 374
 375 int ext4_update_compat_feature(handle_t *handle,
 376                                         struct super_block *sb, __u32 compat)
 377 {
 378         int err = 0;
 379         if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
 380                 err = ext4_journal_get_write_access(handle,
 381                                 EXT4_SB(sb)->s_sbh);
 382                 if (err)
 383                         return err;
 384                 EXT4_SET_COMPAT_FEATURE(sb, compat);
 385                 sb->s_dirt = 1;
 386                 handle->h_sync = 1;
 387                 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
 388                                         "call ext4_journal_dirty_met adata");
 389                 err = ext4_journal_dirty_metadata(handle,
 390                                 EXT4_SB(sb)->s_sbh);
 391         }
 392         return err;
 393 }
 394
 395 int ext4_update_rocompat_feature(handle_t *handle,
 396                                         struct super_block *sb, __u32 rocompat)
 397 {
 398         int err = 0;
 399         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
 400                 err = ext4_journal_get_write_access(handle,
 401                                 EXT4_SB(sb)->s_sbh);
 402                 if (err)
 403                         return err;
 404                 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
 405                 sb->s_dirt = 1;
 406                 handle->h_sync = 1;
 407                 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
 408                                         "call ext4_journal_dirty_met adata");
 409                 err = ext4_journal_dirty_metadata(handle,
 410                                 EXT4_SB(sb)->s_sbh);
 411         }
 412         return err;
 413 }
 414
 415 int ext4_update_incompat_feature(handle_t *handle,
 416                                         struct super_block *sb, __u32 incompat)
 417 {
 418         int err = 0;
 419         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
 420                 err = ext4_journal_get_write_access(handle,
 421                                 EXT4_SB(sb)->s_sbh);
 422                 if (err)
 423                         return err;
 424                 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
 425                 sb->s_dirt = 1;
 426                 handle->h_sync = 1;
 427                 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
 428                                         "call ext4_journal_dirty_met adata");
 429                 err = ext4_journal_dirty_metadata(handle,
 430                                 EXT4_SB(sb)->s_sbh);
 431         }
 432         return err;
 433 }
 434
 435 /*
 436  * Open the external journal device
 437  */
 438 static struct block_device *ext4_blkdev_get(dev_t dev)
 439 {
 440         struct block_device *bdev;
 441         char b[BDEVNAME_SIZE];
 442
 443         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 444         if (IS_ERR(bdev))
 445                 goto fail;
 446         return bdev;
 447
 448 fail:
 449         printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
 450                         __bdevname(dev, b), PTR_ERR(bdev));
 451         return NULL;
 452 }
 453
 454 /*
 455  * Release the journal device
 456  */
 457 static int ext4_blkdev_put(struct block_device *bdev)
 458 {
 459         bd_release(bdev);
 460         return blkdev_put(bdev);
 461 }
 462
 463 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
 464 {
 465         struct block_device *bdev;
 466         int ret = -ENODEV;
 467
 468         bdev = sbi->journal_bdev;
 469         if (bdev) {
 470                 ret = ext4_blkdev_put(bdev);
 471                 sbi->journal_bdev = NULL;
 472         }
 473         return ret;
 474 }
 475
 476 static inline struct inode *orphan_list_entry(struct list_head *l)
 477 {
 478         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
 479 }
 480
 481 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
 482 {
 483         struct list_head *l;
 484
 485         printk(KERN_ERR "sb orphan head is %d\n",
 486                le32_to_cpu(sbi->s_es->s_last_orphan));
 487
 488         printk(KERN_ERR "sb_info orphan list:\n");
 489         list_for_each(l, &sbi->s_orphan) {
 490                 struct inode *inode = orphan_list_entry(l);
 491                 printk(KERN_ERR "  "
 492                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 493                        inode->i_sb->s_id, inode->i_ino, inode,
 494                        inode->i_mode, inode->i_nlink,
 495                        NEXT_ORPHAN(inode));
 496         }
 497 }
 498
 499 static void ext4_put_super (struct super_block * sb)
 500 {
 501         struct ext4_sb_info *sbi = EXT4_SB(sb);
 502         struct ext4_super_block *es = sbi->s_es;
 503         int i;
 504
 505         ext4_mb_release(sb);
 506         ext4_ext_release(sb);
 507         ext4_xattr_put_super(sb);
 508         jbd2_journal_destroy(sbi->s_journal);
 509         sbi->s_journal = NULL;
 510         if (!(sb->s_flags & MS_RDONLY)) {
 511                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
 512                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 513                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 514                 mark_buffer_dirty(sbi->s_sbh);
 515                 ext4_commit_super(sb, es, 1);
 516         }
 517
 518         for (i = 0; i < sbi->s_gdb_count; i++)
 519                 brelse(sbi->s_group_desc[i]);
 520         kfree(sbi->s_group_desc);
 521         kfree(sbi->s_flex_groups);
 522         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 523         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 524         percpu_counter_destroy(&sbi->s_dirs_counter);
 525         brelse(sbi->s_sbh);
 526 #ifdef CONFIG_QUOTA
 527         for (i = 0; i < MAXQUOTAS; i++)
 528                 kfree(sbi->s_qf_names[i]);
 529 #endif
 530
 531         /* Debugging code just in case the in-memory inode orphan list
 532          * isn't empty.  The on-disk one can be non-empty if we've
 533          * detected an error and taken the fs readonly, but the
 534          * in-memory list had better be clean by this point. */
 535         if (!list_empty(&sbi->s_orphan))
 536                 dump_orphan_list(sb, sbi);
 537         J_ASSERT(list_empty(&sbi->s_orphan));
 538
 539         invalidate_bdev(sb->s_bdev);
 540         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 541                 /*
 542                  * Invalidate the journal device's buffers.  We don't want them
 543                  * floating about in memory - the physical journal device may
 544                  * hotswapped, and it breaks the `ro-after' testing code.
 545                  */
 546                 sync_blockdev(sbi->journal_bdev);
 547                 invalidate_bdev(sbi->journal_bdev);
 548                 ext4_blkdev_remove(sbi);
 549         }
 550         sb->s_fs_info = NULL;
 551         kfree(sbi);
 552         return;
 553 }
 554
 555 static struct kmem_cache *ext4_inode_cachep;
 556
 557 /*
 558  * Called inside transaction, so use GFP_NOFS
 559  */
 560 static struct inode *ext4_alloc_inode(struct super_block *sb)
 561 {
 562         struct ext4_inode_info *ei;
 563
 564         ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
 565         if (!ei)
 566                 return NULL;
 567 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
 568         ei->i_acl = EXT4_ACL_NOT_CACHED;
 569         ei->i_default_acl = EXT4_ACL_NOT_CACHED;
 570 #endif
 571         ei->i_block_alloc_info = NULL;
 572         ei->vfs_inode.i_version = 1;
 573         memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
 574         INIT_LIST_HEAD(&ei->i_prealloc_list);
 575         spin_lock_init(&ei->i_prealloc_lock);
 576         jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
 577         return &ei->vfs_inode;
 578 }
 579
 580 static void ext4_destroy_inode(struct inode *inode)
 581 {
 582         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
 583                 printk("EXT4 Inode %p: orphan list check failed!\n",
 584                         EXT4_I(inode));
 585                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 586                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
 587                                 true);
 588                 dump_stack();
 589         }
 590         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
 591 }
 592
 593 static void init_once(struct kmem_cache *cachep, void *foo)
 594 {
 595         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
 596
 597         INIT_LIST_HEAD(&ei->i_orphan);
 598 #ifdef CONFIG_EXT4DEV_FS_XATTR
 599         init_rwsem(&ei->xattr_sem);
 600 #endif
 601         init_rwsem(&ei->i_data_sem);
 602         inode_init_once(&ei->vfs_inode);
 603 }
 604
 605 static int init_inodecache(void)
 606 {
 607         ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
 608                                              sizeof(struct ext4_inode_info),
 609                                              0, (SLAB_RECLAIM_ACCOUNT|
 610                                                 SLAB_MEM_SPREAD),
 611                                              init_once);
 612         if (ext4_inode_cachep == NULL)
 613                 return -ENOMEM;
 614         return 0;
 615 }
 616
 617 static void destroy_inodecache(void)
 618 {
 619         kmem_cache_destroy(ext4_inode_cachep);
 620 }
 621
 622 static void ext4_clear_inode(struct inode *inode)
 623 {
 624         struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
 625 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
 626         if (EXT4_I(inode)->i_acl &&
 627                         EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
 628                 posix_acl_release(EXT4_I(inode)->i_acl);
 629                 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
 630         }
 631         if (EXT4_I(inode)->i_default_acl &&
 632                         EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
 633                 posix_acl_release(EXT4_I(inode)->i_default_acl);
 634                 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
 635         }
 636 #endif
 637         ext4_discard_reservation(inode);
 638         EXT4_I(inode)->i_block_alloc_info = NULL;
 639         if (unlikely(rsv))
 640                 kfree(rsv);
 641         jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
 642                                        &EXT4_I(inode)->jinode);
 643 }
 644
 645 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
 646 {
 647 #if defined(CONFIG_QUOTA)
 648         struct ext4_sb_info *sbi = EXT4_SB(sb);
 649
 650         if (sbi->s_jquota_fmt)
 651                 seq_printf(seq, ",jqfmt=%s",
 652                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 653
 654         if (sbi->s_qf_names[USRQUOTA])
 655                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 656
 657         if (sbi->s_qf_names[GRPQUOTA])
 658                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 659
 660         if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
 661                 seq_puts(seq, ",usrquota");
 662
 663         if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
 664                 seq_puts(seq, ",grpquota");
 665 #endif
 666 }
 667
 668 /*
 669  * Show an option if
 670  *  - it's set to a non-default value OR
 671  *  - if the per-sb default is different from the global default
 672  */
 673 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
 674 {
 675         int def_errors;
 676         unsigned long def_mount_opts;
 677         struct super_block *sb = vfs->mnt_sb;
 678         struct ext4_sb_info *sbi = EXT4_SB(sb);
 679         struct ext4_super_block *es = sbi->s_es;
 680
 681         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 682         def_errors     = le16_to_cpu(es->s_errors);
 683
 684         if (sbi->s_sb_block != 1)
 685                 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
 686         if (test_opt(sb, MINIX_DF))
 687                 seq_puts(seq, ",minixdf");
 688         if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
 689                 seq_puts(seq, ",grpid");
 690         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
 691                 seq_puts(seq, ",nogrpid");
 692         if (sbi->s_resuid != EXT4_DEF_RESUID ||
 693             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
 694                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 695         }
 696         if (sbi->s_resgid != EXT4_DEF_RESGID ||
 697             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
 698                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 699         }
 700         if (test_opt(sb, ERRORS_RO)) {
 701                 if (def_errors == EXT4_ERRORS_PANIC ||
 702                     def_errors == EXT4_ERRORS_CONTINUE) {
 703                         seq_puts(seq, ",errors=remount-ro");
 704                 }
 705         }
 706         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
 707                 seq_puts(seq, ",errors=continue");
 708         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
 709                 seq_puts(seq, ",errors=panic");
 710         if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
 711                 seq_puts(seq, ",nouid32");
 712         if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
 713                 seq_puts(seq, ",debug");
 714         if (test_opt(sb, OLDALLOC))
 715                 seq_puts(seq, ",oldalloc");
 716 #ifdef CONFIG_EXT4DEV_FS_XATTR
 717         if (test_opt(sb, XATTR_USER) &&
 718                 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
 719                 seq_puts(seq, ",user_xattr");
 720         if (!test_opt(sb, XATTR_USER) &&
 721             (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
 722                 seq_puts(seq, ",nouser_xattr");
 723         }
 724 #endif
 725 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
 726         if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
 727                 seq_puts(seq, ",acl");
 728         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
 729                 seq_puts(seq, ",noacl");
 730 #endif
 731         if (!test_opt(sb, RESERVATION))
 732                 seq_puts(seq, ",noreservation");
 733         if (sbi->s_commit_interval) {
 734                 seq_printf(seq, ",commit=%u",
 735                            (unsigned) (sbi->s_commit_interval / HZ));
 736         }
 737         /*
 738          * We're changing the default of barrier mount option, so
 739          * let's always display its mount state so it's clear what its
 740          * status is.
 741          */
 742         seq_puts(seq, ",barrier=");
 743         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 744         if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
 745                 seq_puts(seq, ",journal_async_commit");
 746         if (test_opt(sb, NOBH))
 747                 seq_puts(seq, ",nobh");
 748         if (!test_opt(sb, EXTENTS))
 749                 seq_puts(seq, ",noextents");
 750         if (!test_opt(sb, MBALLOC))
 751                 seq_puts(seq, ",nomballoc");
 752         if (test_opt(sb, I_VERSION))
 753                 seq_puts(seq, ",i_version");
 754
 755         if (sbi->s_stripe)
 756                 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
 757         /*
 758          * journal mode get enabled in different ways
 759          * So just print the value even if we didn't specify it
 760          */
 761         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
 762                 seq_puts(seq, ",data=journal");
 763         else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
 764                 seq_puts(seq, ",data=ordered");
 765         else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
 766                 seq_puts(seq, ",data=writeback");
 767
 768         ext4_show_quota_options(seq, sb);
 769         return 0;
 770 }
 771
 772
 773 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
 774                 u64 ino, u32 generation)
 775 {
 776         struct inode *inode;
 777
 778         if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
 779                 return ERR_PTR(-ESTALE);
 780         if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
 781                 return ERR_PTR(-ESTALE);
 782
 783         /* iget isn't really right if the inode is currently unallocated!!
 784          *
 785          * ext4_read_inode will return a bad_inode if the inode had been
 786          * deleted, so we should be safe.
 787          *
 788          * Currently we don't know the generation for parent directory, so
 789          * a generation of 0 means "accept any"
 790          */
 791         inode = ext4_iget(sb, ino);
 792         if (IS_ERR(inode))
 793                 return ERR_CAST(inode);
 794         if (generation && inode->i_generation != generation) {
 795                 iput(inode);
 796                 return ERR_PTR(-ESTALE);
 797         }
 798
 799         return inode;
 800 }
 801
 802 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
 803                 int fh_len, int fh_type)
 804 {
 805         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 806                                     ext4_nfs_get_inode);
 807 }
 808
 809 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
 810                 int fh_len, int fh_type)
 811 {
 812         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 813                                     ext4_nfs_get_inode);
 814 }
 815
 816 #ifdef CONFIG_QUOTA
 817 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 818 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 819
 820 static int ext4_dquot_initialize(struct inode *inode, int type);
 821 static int ext4_dquot_drop(struct inode *inode);
 822 static int ext4_write_dquot(struct dquot *dquot);
 823 static int ext4_acquire_dquot(struct dquot *dquot);
 824 static int ext4_release_dquot(struct dquot *dquot);
 825 static int ext4_mark_dquot_dirty(struct dquot *dquot);
 826 static int ext4_write_info(struct super_block *sb, int type);
 827 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
 828                                 char *path, int remount);
 829 static int ext4_quota_on_mount(struct super_block *sb, int type);
 830 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 831                                size_t len, loff_t off);
 832 static ssize_t ext4_quota_write(struct super_block *sb, int type,
 833                                 const char *data, size_t len, loff_t off);
 834
 835 static struct dquot_operations ext4_quota_operations = {
 836         .initialize     = ext4_dquot_initialize,
 837         .drop           = ext4_dquot_drop,
 838         .alloc_space    = dquot_alloc_space,
 839         .alloc_inode    = dquot_alloc_inode,
 840         .free_space     = dquot_free_space,
 841         .free_inode     = dquot_free_inode,
 842         .transfer       = dquot_transfer,
 843         .write_dquot    = ext4_write_dquot,
 844         .acquire_dquot  = ext4_acquire_dquot,
 845         .release_dquot  = ext4_release_dquot,
 846         .mark_dirty     = ext4_mark_dquot_dirty,
 847         .write_info     = ext4_write_info
 848 };
 849
 850 static struct quotactl_ops ext4_qctl_operations = {
 851         .quota_on       = ext4_quota_on,
 852         .quota_off      = vfs_quota_off,
 853         .quota_sync     = vfs_quota_sync,
 854         .get_info       = vfs_get_dqinfo,
 855         .set_info       = vfs_set_dqinfo,
 856         .get_dqblk      = vfs_get_dqblk,
 857         .set_dqblk      = vfs_set_dqblk
 858 };
 859 #endif
 860
 861 static const struct super_operations ext4_sops = {
 862         .alloc_inode    = ext4_alloc_inode,
 863         .destroy_inode  = ext4_destroy_inode,
 864         .write_inode    = ext4_write_inode,
 865         .dirty_inode    = ext4_dirty_inode,
 866         .delete_inode   = ext4_delete_inode,
 867         .put_super      = ext4_put_super,
 868         .write_super    = ext4_write_super,
 869         .sync_fs        = ext4_sync_fs,
 870         .write_super_lockfs = ext4_write_super_lockfs,
 871         .unlockfs       = ext4_unlockfs,
 872         .statfs         = ext4_statfs,
 873         .remount_fs     = ext4_remount,
 874         .clear_inode    = ext4_clear_inode,
 875         .show_options   = ext4_show_options,
 876 #ifdef CONFIG_QUOTA
 877         .quota_read     = ext4_quota_read,
 878         .quota_write    = ext4_quota_write,
 879 #endif
 880 };
 881
 882 static const struct export_operations ext4_export_ops = {
 883         .fh_to_dentry = ext4_fh_to_dentry,
 884         .fh_to_parent = ext4_fh_to_parent,
 885         .get_parent = ext4_get_parent,
 886 };
 887
 888 enum {
 889         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 890         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 891         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 892         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 893         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 894         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 895         Opt_journal_checksum, Opt_journal_async_commit,
 896         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 897         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 898         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 899         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 900         Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
 901         Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc,
 902 };
 903
 904 static match_table_t tokens = {
 905         {Opt_bsd_df, "bsddf"},
 906         {Opt_minix_df, "minixdf"},
 907         {Opt_grpid, "grpid"},
 908         {Opt_grpid, "bsdgroups"},
 909         {Opt_nogrpid, "nogrpid"},
 910         {Opt_nogrpid, "sysvgroups"},
 911         {Opt_resgid, "resgid=%u"},
 912         {Opt_resuid, "resuid=%u"},
 913         {Opt_sb, "sb=%u"},
 914         {Opt_err_cont, "errors=continue"},
 915         {Opt_err_panic, "errors=panic"},
 916         {Opt_err_ro, "errors=remount-ro"},
 917         {Opt_nouid32, "nouid32"},
 918         {Opt_nocheck, "nocheck"},
 919         {Opt_nocheck, "check=none"},
 920         {Opt_debug, "debug"},
 921         {Opt_oldalloc, "oldalloc"},
 922         {Opt_orlov, "orlov"},
 923         {Opt_user_xattr, "user_xattr"},
 924         {Opt_nouser_xattr, "nouser_xattr"},
 925         {Opt_acl, "acl"},
 926         {Opt_noacl, "noacl"},
 927         {Opt_reservation, "reservation"},
 928         {Opt_noreservation, "noreservation"},
 929         {Opt_noload, "noload"},
 930         {Opt_nobh, "nobh"},
 931         {Opt_bh, "bh"},
 932         {Opt_commit, "commit=%u"},
 933         {Opt_journal_update, "journal=update"},
 934         {Opt_journal_inum, "journal=%u"},
 935         {Opt_journal_dev, "journal_dev=%u"},
 936         {Opt_journal_checksum, "journal_checksum"},
 937         {Opt_journal_async_commit, "journal_async_commit"},
 938         {Opt_abort, "abort"},
 939         {Opt_data_journal, "data=journal"},
 940         {Opt_data_ordered, "data=ordered"},
 941         {Opt_data_writeback, "data=writeback"},
 942         {Opt_offusrjquota, "usrjquota="},
 943         {Opt_usrjquota, "usrjquota=%s"},
 944         {Opt_offgrpjquota, "grpjquota="},
 945         {Opt_grpjquota, "grpjquota=%s"},
 946         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 947         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 948         {Opt_grpquota, "grpquota"},
 949         {Opt_noquota, "noquota"},
 950         {Opt_quota, "quota"},
 951         {Opt_usrquota, "usrquota"},
 952         {Opt_barrier, "barrier=%u"},
 953         {Opt_extents, "extents"},
 954         {Opt_noextents, "noextents"},
 955         {Opt_i_version, "i_version"},
 956         {Opt_mballoc, "mballoc"},
 957         {Opt_nomballoc, "nomballoc"},
 958         {Opt_stripe, "stripe=%u"},
 959         {Opt_resize, "resize"},
 960         {Opt_delalloc, "delalloc"},
 961         {Opt_err, NULL},
 962 };
 963
 964 static ext4_fsblk_t get_sb_block(void **data)
 965 {
 966         ext4_fsblk_t    sb_block;
 967         char            *options = (char *) *data;
 968
 969         if (!options || strncmp(options, "sb=", 3) != 0)
 970                 return 1;       /* Default location */
 971         options += 3;
 972         /*todo: use simple_strtoll with >32bit ext4 */
 973         sb_block = simple_strtoul(options, &options, 0);
 974         if (*options && *options != ',') {
 975                 printk("EXT4-fs: Invalid sb specification: %s\n",
 976                        (char *) *data);
 977                 return 1;
 978         }
 979         if (*options == ',')
 980                 options++;
 981         *data = (void *) options;
 982         return sb_block;
 983 }
 984
 985 static int parse_options (char *options, struct super_block *sb,
 986                           unsigned int *inum, unsigned long *journal_devnum,
 987                           ext4_fsblk_t *n_blocks_count, int is_remount)
 988 {
 989         struct ext4_sb_info *sbi = EXT4_SB(sb);
 990         char * p;
 991         substring_t args[MAX_OPT_ARGS];
 992         int data_opt = 0;
 993         int option;
 994 #ifdef CONFIG_QUOTA
 995         int qtype, qfmt;
 996         char *qname;
 997 #endif
 998
 999         if (!options)
1000                 return 1;
1001
1002         while ((p = strsep (&options, ",")) != NULL) {
1003                 int token;
1004                 if (!*p)
1005                         continue;
1006
1007                 token = match_token(p, tokens, args);
1008                 switch (token) {
1009                 case Opt_bsd_df:
1010                         clear_opt (sbi->s_mount_opt, MINIX_DF);
1011                         break;
1012                 case Opt_minix_df:
1013                         set_opt (sbi->s_mount_opt, MINIX_DF);
1014                         break;
1015                 case Opt_grpid:
1016                         set_opt (sbi->s_mount_opt, GRPID);
1017                         break;
1018                 case Opt_nogrpid:
1019                         clear_opt (sbi->s_mount_opt, GRPID);
1020                         break;
1021                 case Opt_resuid:
1022                         if (match_int(&args[0], &option))
1023                                 return 0;
1024                         sbi->s_resuid = option;
1025                         break;
1026                 case Opt_resgid:
1027                         if (match_int(&args[0], &option))
1028                                 return 0;
1029                         sbi->s_resgid = option;
1030                         break;
1031                 case Opt_sb:
1032                         /* handled by get_sb_block() instead of here */
1033                         /* *sb_block = match_int(&args[0]); */
1034                         break;
1035                 case Opt_err_panic:
1036                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1037                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1038                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1039                         break;
1040                 case Opt_err_ro:
1041                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1042                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1043                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1044                         break;
1045                 case Opt_err_cont:
1046                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1047                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1048                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1049                         break;
1050                 case Opt_nouid32:
1051                         set_opt (sbi->s_mount_opt, NO_UID32);
1052                         break;
1053                 case Opt_nocheck:
1054                         clear_opt (sbi->s_mount_opt, CHECK);
1055                         break;
1056                 case Opt_debug:
1057                         set_opt (sbi->s_mount_opt, DEBUG);
1058                         break;
1059                 case Opt_oldalloc:
1060                         set_opt (sbi->s_mount_opt, OLDALLOC);
1061                         break;
1062                 case Opt_orlov:
1063                         clear_opt (sbi->s_mount_opt, OLDALLOC);
1064                         break;
1065 #ifdef CONFIG_EXT4DEV_FS_XATTR
1066                 case Opt_user_xattr:
1067                         set_opt (sbi->s_mount_opt, XATTR_USER);
1068                         break;
1069                 case Opt_nouser_xattr:
1070                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1071                         break;
1072 #else
1073                 case Opt_user_xattr:
1074                 case Opt_nouser_xattr:
1075                         printk("EXT4 (no)user_xattr options not supported\n");
1076                         break;
1077 #endif
1078 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1079                 case Opt_acl:
1080                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1081                         break;
1082                 case Opt_noacl:
1083                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1084                         break;
1085 #else
1086                 case Opt_acl:
1087                 case Opt_noacl:
1088                         printk("EXT4 (no)acl options not supported\n");
1089                         break;
1090 #endif
1091                 case Opt_reservation:
1092                         set_opt(sbi->s_mount_opt, RESERVATION);
1093                         break;
1094                 case Opt_noreservation:
1095                         clear_opt(sbi->s_mount_opt, RESERVATION);
1096                         break;
1097                 case Opt_journal_update:
1098                         /* @@@ FIXME */
1099                         /* Eventually we will want to be able to create
1100                            a journal file here.  For now, only allow the
1101                            user to specify an existing inode to be the
1102                            journal file. */
1103                         if (is_remount) {
1104                                 printk(KERN_ERR "EXT4-fs: cannot specify "
1105                                        "journal on remount\n");
1106                                 return 0;
1107                         }
1108                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1109                         break;
1110                 case Opt_journal_inum:
1111                         if (is_remount) {
1112                                 printk(KERN_ERR "EXT4-fs: cannot specify "
1113                                        "journal on remount\n");
1114                                 return 0;
1115                         }
1116                         if (match_int(&args[0], &option))
1117                                 return 0;
1118                         *inum = option;
1119                         break;
1120                 case Opt_journal_dev:
1121                         if (is_remount) {
1122                                 printk(KERN_ERR "EXT4-fs: cannot specify "
1123                                        "journal on remount\n");
1124                                 return 0;
1125                         }
1126                         if (match_int(&args[0], &option))
1127                                 return 0;
1128                         *journal_devnum = option;
1129                         break;
1130                 case Opt_journal_checksum:
1131                         set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1132                         break;
1133                 case Opt_journal_async_commit:
1134                         set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1135                         set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1136                         break;
1137                 case Opt_noload:
1138                         set_opt (sbi->s_mount_opt, NOLOAD);
1139                         break;
1140                 case Opt_commit:
1141                         if (match_int(&args[0], &option))
1142                                 return 0;
1143                         if (option < 0)
1144                                 return 0;
1145                         if (option == 0)
1146                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1147                         sbi->s_commit_interval = HZ * option;
1148                         break;
1149                 case Opt_data_journal:
1150                         data_opt = EXT4_MOUNT_JOURNAL_DATA;
1151                         goto datacheck;
1152                 case Opt_data_ordered:
1153                         data_opt = EXT4_MOUNT_ORDERED_DATA;
1154                         goto datacheck;
1155                 case Opt_data_writeback:
1156                         data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1157                 datacheck:
1158                         if (is_remount) {
1159                                 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1160                                                 != data_opt) {
1161                                         printk(KERN_ERR
1162                                                 "EXT4-fs: cannot change data "
1163                                                 "mode on remount\n");
1164                                         return 0;
1165                                 }
1166                         } else {
1167                                 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1168                                 sbi->s_mount_opt |= data_opt;
1169                         }
1170                         break;
1171 #ifdef CONFIG_QUOTA
1172                 case Opt_usrjquota:
1173                         qtype = USRQUOTA;
1174                         goto set_qf_name;
1175                 case Opt_grpjquota:
1176                         qtype = GRPQUOTA;
1177 set_qf_name:
1178                         if ((sb_any_quota_enabled(sb) ||
1179                              sb_any_quota_suspended(sb)) &&
1180                             !sbi->s_qf_names[qtype]) {
1181                                 printk(KERN_ERR
1182                                         "EXT4-fs: Cannot change journaled "
1183                                         "quota options when quota turned on.\n");
1184                                 return 0;
1185                         }
1186                         qname = match_strdup(&args[0]);
1187                         if (!qname) {
1188                                 printk(KERN_ERR
1189                                         "EXT4-fs: not enough memory for "
1190                                         "storing quotafile name.\n");
1191                                 return 0;
1192                         }
1193                         if (sbi->s_qf_names[qtype] &&
1194                             strcmp(sbi->s_qf_names[qtype], qname)) {
1195                                 printk(KERN_ERR
1196                                         "EXT4-fs: %s quota file already "
1197                                         "specified.\n", QTYPE2NAME(qtype));
1198                                 kfree(qname);
1199                                 return 0;
1200                         }
1201                         sbi->s_qf_names[qtype] = qname;
1202                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1203                                 printk(KERN_ERR
1204                                         "EXT4-fs: quotafile must be on "
1205                                         "filesystem root.\n");
1206                                 kfree(sbi->s_qf_names[qtype]);
1207                                 sbi->s_qf_names[qtype] = NULL;
1208                                 return 0;
1209                         }
1210                         set_opt(sbi->s_mount_opt, QUOTA);
1211                         break;
1212                 case Opt_offusrjquota:
1213                         qtype = USRQUOTA;
1214                         goto clear_qf_name;
1215                 case Opt_offgrpjquota:
1216                         qtype = GRPQUOTA;
1217 clear_qf_name:
1218                         if ((sb_any_quota_enabled(sb) ||
1219                              sb_any_quota_suspended(sb)) &&
1220                             sbi->s_qf_names[qtype]) {
1221                                 printk(KERN_ERR "EXT4-fs: Cannot change "
1222                                         "journaled quota options when "
1223                                         "quota turned on.\n");
1224                                 return 0;
1225                         }
1226                         /*
1227                          * The space will be released later when all options
1228                          * are confirmed to be correct
1229                          */
1230                         sbi->s_qf_names[qtype] = NULL;
1231                         break;
1232                 case Opt_jqfmt_vfsold:
1233                         qfmt = QFMT_VFS_OLD;
1234                         goto set_qf_format;
1235                 case Opt_jqfmt_vfsv0:
1236                         qfmt = QFMT_VFS_V0;
1237 set_qf_format:
1238                         if ((sb_any_quota_enabled(sb) ||
1239                              sb_any_quota_suspended(sb)) &&
1240                             sbi->s_jquota_fmt != qfmt) {
1241                                 printk(KERN_ERR "EXT4-fs: Cannot change "
1242                                         "journaled quota options when "
1243                                         "quota turned on.\n");
1244                                 return 0;
1245                         }
1246                         sbi->s_jquota_fmt = qfmt;
1247                         break;
1248                 case Opt_quota:
1249                 case Opt_usrquota:
1250                         set_opt(sbi->s_mount_opt, QUOTA);
1251                         set_opt(sbi->s_mount_opt, USRQUOTA);
1252                         break;
1253                 case Opt_grpquota:
1254                         set_opt(sbi->s_mount_opt, QUOTA);
1255                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1256                         break;
1257                 case Opt_noquota:
1258                         if (sb_any_quota_enabled(sb)) {
1259                                 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1260                                         "options when quota turned on.\n");
1261                                 return 0;
1262                         }
1263                         clear_opt(sbi->s_mount_opt, QUOTA);
1264                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1265                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1266                         break;
1267 #else
1268                 case Opt_quota:
1269                 case Opt_usrquota:
1270                 case Opt_grpquota:
1271                         printk(KERN_ERR
1272                                 "EXT4-fs: quota options not supported.\n");
1273                         break;
1274                 case Opt_usrjquota:
1275                 case Opt_grpjquota:
1276                 case Opt_offusrjquota:
1277                 case Opt_offgrpjquota:
1278                 case Opt_jqfmt_vfsold:
1279                 case Opt_jqfmt_vfsv0:
1280                         printk(KERN_ERR
1281                                 "EXT4-fs: journaled quota options not "
1282                                 "supported.\n");
1283                         break;
1284                 case Opt_noquota:
1285                         break;
1286 #endif
1287                 case Opt_abort:
1288                         set_opt(sbi->s_mount_opt, ABORT);
1289                         break;
1290                 case Opt_barrier:
1291                         if (match_int(&args[0], &option))
1292                                 return 0;
1293                         if (option)
1294                                 set_opt(sbi->s_mount_opt, BARRIER);
1295                         else
1296                                 clear_opt(sbi->s_mount_opt, BARRIER);
1297                         break;
1298                 case Opt_ignore:
1299                         break;
1300                 case Opt_resize:
1301                         if (!is_remount) {
1302                                 printk("EXT4-fs: resize option only available "
1303                                         "for remount\n");
1304                                 return 0;
1305                         }
1306                         if (match_int(&args[0], &option) != 0)
1307                                 return 0;
1308                         *n_blocks_count = option;
1309                         break;
1310                 case Opt_nobh:
1311                         set_opt(sbi->s_mount_opt, NOBH);
1312                         break;
1313                 case Opt_bh:
1314                         clear_opt(sbi->s_mount_opt, NOBH);
1315                         break;
1316                 case Opt_extents:
1317                         set_opt (sbi->s_mount_opt, EXTENTS);
1318                         break;
1319                 case Opt_noextents:
1320                         clear_opt (sbi->s_mount_opt, EXTENTS);
1321                         break;
1322                 case Opt_i_version:
1323                         set_opt(sbi->s_mount_opt, I_VERSION);
1324                         sb->s_flags |= MS_I_VERSION;
1325                         break;
1326                 case Opt_mballoc:
1327                         set_opt(sbi->s_mount_opt, MBALLOC);
1328                         break;
1329                 case Opt_nomballoc:
1330                         clear_opt(sbi->s_mount_opt, MBALLOC);
1331                         break;
1332                 case Opt_stripe:
1333                         if (match_int(&args[0], &option))
1334                                 return 0;
1335                         if (option < 0)
1336                                 return 0;
1337                         sbi->s_stripe = option;
1338                         break;
1339                 case Opt_delalloc:
1340                         set_opt(sbi->s_mount_opt, DELALLOC);
1341                         break;
1342                 default:
1343                         printk (KERN_ERR
1344                                 "EXT4-fs: Unrecognized mount option \"%s\" "
1345                                 "or missing value\n", p);
1346                         return 0;
1347                 }
1348         }
1349 #ifdef CONFIG_QUOTA
1350         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1351                 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1352                      sbi->s_qf_names[USRQUOTA])
1353                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1354
1355                 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1356                      sbi->s_qf_names[GRPQUOTA])
1357                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1358
1359                 if ((sbi->s_qf_names[USRQUOTA] &&
1360                                 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1361                     (sbi->s_qf_names[GRPQUOTA] &&
1362                                 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1363                         printk(KERN_ERR "EXT4-fs: old and new quota "
1364                                         "format mixing.\n");
1365                         return 0;
1366                 }
1367
1368                 if (!sbi->s_jquota_fmt) {
1369                         printk(KERN_ERR "EXT4-fs: journaled quota format "
1370                                         "not specified.\n");
1371                         return 0;
1372                 }
1373         } else {
1374                 if (sbi->s_jquota_fmt) {
1375                         printk(KERN_ERR "EXT4-fs: journaled quota format "
1376                                         "specified with no journaling "
1377                                         "enabled.\n");
1378                         return 0;
1379                 }
1380         }
1381 #endif
1382         return 1;
1383 }
1384
1385 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1386                             int read_only)
1387 {
1388         struct ext4_sb_info *sbi = EXT4_SB(sb);
1389         int res = 0;
1390
1391         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1392                 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1393                         "forcing read-only mode\n");
1394                 res = MS_RDONLY;
1395         }
1396         if (read_only)
1397                 return res;
1398         if (!(sbi->s_mount_state & EXT4_VALID_FS))
1399                 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1400                         "running e2fsck is recommended\n");
1401         else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1402                 printk (KERN_WARNING
1403                         "EXT4-fs warning: mounting fs with errors, "
1404                         "running e2fsck is recommended\n");
1405         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1406                  le16_to_cpu(es->s_mnt_count) >=
1407                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1408                 printk (KERN_WARNING
1409                         "EXT4-fs warning: maximal mount count reached, "
1410                         "running e2fsck is recommended\n");
1411         else if (le32_to_cpu(es->s_checkinterval) &&
1412                 (le32_to_cpu(es->s_lastcheck) +
1413                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1414                 printk (KERN_WARNING
1415                         "EXT4-fs warning: checktime reached, "
1416                         "running e2fsck is recommended\n");
1417 #if 0
1418                 /* @@@ We _will_ want to clear the valid bit if we find
1419                  * inconsistencies, to force a fsck at reboot.  But for
1420                  * a plain journaled filesystem we can keep it set as
1421                  * valid forever! :)
1422                  */
1423         es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1424 #endif
1425         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1426                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1427         le16_add_cpu(&es->s_mnt_count, 1);
1428         es->s_mtime = cpu_to_le32(get_seconds());
1429         ext4_update_dynamic_rev(sb);
1430         EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1431
1432         ext4_commit_super(sb, es, 1);
1433         if (test_opt(sb, DEBUG))
1434                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1435                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1436                         sb->s_blocksize,
1437                         sbi->s_groups_count,
1438                         EXT4_BLOCKS_PER_GROUP(sb),
1439                         EXT4_INODES_PER_GROUP(sb),
1440                         sbi->s_mount_opt);
1441
1442         printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1443         if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1444                 char b[BDEVNAME_SIZE];
1445
1446                 printk("external journal on %s\n",
1447                         bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1448         } else {
1449                 printk("internal journal\n");
1450         }
1451         return res;
1452 }
1453
1454 static int ext4_fill_flex_info(struct super_block *sb)
1455 {
1456         struct ext4_sb_info *sbi = EXT4_SB(sb);
1457         struct ext4_group_desc *gdp = NULL;
1458         struct buffer_head *bh;
1459         ext4_group_t flex_group_count;
1460         ext4_group_t flex_group;
1461         int groups_per_flex = 0;
1462         __u64 block_bitmap = 0;
1463         int i;
1464
1465         if (!sbi->s_es->s_log_groups_per_flex) {
1466                 sbi->s_log_groups_per_flex = 0;
1467                 return 1;
1468         }
1469
1470         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1471         groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1472
1473         flex_group_count = (sbi->s_groups_count + groups_per_flex - 1) /
1474                 groups_per_flex;
1475         sbi->s_flex_groups = kmalloc(flex_group_count *
1476                                      sizeof(struct flex_groups), GFP_KERNEL);
1477         if (sbi->s_flex_groups == NULL) {
1478                 printk(KERN_ERR "EXT4-fs: not enough memory\n");
1479                 goto failed;
1480         }
1481         memset(sbi->s_flex_groups, 0, flex_group_count *
1482                sizeof(struct flex_groups));
1483
1484         gdp = ext4_get_group_desc(sb, 1, &bh);
1485         block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1486
1487         for (i = 0; i < sbi->s_groups_count; i++) {
1488                 gdp = ext4_get_group_desc(sb, i, &bh);
1489
1490                 flex_group = ext4_flex_group(sbi, i);
1491                 sbi->s_flex_groups[flex_group].free_inodes +=
1492                         le16_to_cpu(gdp->bg_free_inodes_count);
1493                 sbi->s_flex_groups[flex_group].free_blocks +=
1494                         le16_to_cpu(gdp->bg_free_blocks_count);
1495         }
1496
1497         return 1;
1498 failed:
1499         return 0;
1500 }
1501
1502 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1503                             struct ext4_group_desc *gdp)
1504 {
1505         __u16 crc = 0;
1506
1507         if (sbi->s_es->s_feature_ro_compat &
1508             cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1509                 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1510                 __le32 le_group = cpu_to_le32(block_group);
1511
1512                 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1513                 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1514                 crc = crc16(crc, (__u8 *)gdp, offset);
1515                 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1516                 /* for checksum of struct ext4_group_desc do the rest...*/
1517                 if ((sbi->s_es->s_feature_incompat &
1518                      cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1519                     offset < le16_to_cpu(sbi->s_es->s_desc_size))
1520                         crc = crc16(crc, (__u8 *)gdp + offset,
1521                                     le16_to_cpu(sbi->s_es->s_desc_size) -
1522                                         offset);
1523         }
1524
1525         return cpu_to_le16(crc);
1526 }
1527
1528 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1529                                 struct ext4_group_desc *gdp)
1530 {
1531         if ((sbi->s_es->s_feature_ro_compat &
1532              cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1533             (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1534                 return 0;
1535
1536         return 1;
1537 }
1538
1539 /* Called at mount-time, super-block is locked */
1540 static int ext4_check_descriptors(struct super_block *sb)
1541 {
1542         struct ext4_sb_info *sbi = EXT4_SB(sb);
1543         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1544         ext4_fsblk_t last_block;
1545         ext4_fsblk_t block_bitmap;
1546         ext4_fsblk_t inode_bitmap;
1547         ext4_fsblk_t inode_table;
1548         int flexbg_flag = 0;
1549         ext4_group_t i;
1550
1551         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1552                 flexbg_flag = 1;
1553
1554         ext4_debug ("Checking group descriptors");
1555
1556         for (i = 0; i < sbi->s_groups_count; i++) {
1557                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1558
1559                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1560                         last_block = ext4_blocks_count(sbi->s_es) - 1;
1561                 else
1562                         last_block = first_block +
1563                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1564
1565                 block_bitmap = ext4_block_bitmap(sb, gdp);
1566                 if (block_bitmap < first_block || block_bitmap > last_block)
1567                 {
1568                         printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1569                                "Block bitmap for group %lu not in group "
1570                                "(block %llu)!", i, block_bitmap);
1571                         return 0;
1572                 }
1573                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1574                 if (inode_bitmap < first_block || inode_bitmap > last_block)
1575                 {
1576                         printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1577                                "Inode bitmap for group %lu not in group "
1578                                "(block %llu)!", i, inode_bitmap);
1579                         return 0;
1580                 }
1581                 inode_table = ext4_inode_table(sb, gdp);
1582                 if (inode_table < first_block ||
1583                     inode_table + sbi->s_itb_per_group - 1 > last_block)
1584                 {
1585                         printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1586                                "Inode table for group %lu not in group "
1587                                "(block %llu)!", i, inode_table);
1588                         return 0;
1589                 }
1590                 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1591                         printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1592                                "Checksum for group %lu failed (%u!=%u)\n",
1593                                i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1594                                gdp)), le16_to_cpu(gdp->bg_checksum));
1595                         return 0;
1596                 }
1597                 if (!flexbg_flag)
1598                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
1599         }
1600
1601         ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1602         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1603         return 1;
1604 }
1605
1606 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1607  * the superblock) which were deleted from all directories, but held open by
1608  * a process at the time of a crash.  We walk the list and try to delete these
1609  * inodes at recovery time (only with a read-write filesystem).
1610  *
1611  * In order to keep the orphan inode chain consistent during traversal (in
1612  * case of crash during recovery), we link each inode into the superblock
1613  * orphan list_head and handle it the same way as an inode deletion during
1614  * normal operation (which journals the operations for us).
1615  *
1616  * We only do an iget() and an iput() on each inode, which is very safe if we
1617  * accidentally point at an in-use or already deleted inode.  The worst that
1618  * can happen in this case is that we get a "bit already cleared" message from
1619  * ext4_free_inode().  The only reason we would point at a wrong inode is if
1620  * e2fsck was run on this filesystem, and it must have already done the orphan
1621  * inode cleanup for us, so we can safely abort without any further action.
1622  */
1623 static void ext4_orphan_cleanup (struct super_block * sb,
1624                                  struct ext4_super_block * es)
1625 {
1626         unsigned int s_flags = sb->s_flags;
1627         int nr_orphans = 0, nr_truncates = 0;
1628 #ifdef CONFIG_QUOTA
1629         int i;
1630 #endif
1631         if (!es->s_last_orphan) {
1632                 jbd_debug(4, "no orphan inodes to clean up\n");
1633                 return;
1634         }
1635
1636         if (bdev_read_only(sb->s_bdev)) {
1637                 printk(KERN_ERR "EXT4-fs: write access "
1638                         "unavailable, skipping orphan cleanup.\n");
1639                 return;
1640         }
1641
1642         if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1643                 if (es->s_last_orphan)
1644                         jbd_debug(1, "Errors on filesystem, "
1645                                   "clearing orphan list.\n");
1646                 es->s_last_orphan = 0;
1647                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1648                 return;
1649         }
1650
1651         if (s_flags & MS_RDONLY) {
1652                 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1653                        sb->s_id);
1654                 sb->s_flags &= ~MS_RDONLY;
1655         }
1656 #ifdef CONFIG_QUOTA
1657         /* Needed for iput() to work correctly and not trash data */
1658         sb->s_flags |= MS_ACTIVE;
1659         /* Turn on quotas so that they are updated correctly */
1660         for (i = 0; i < MAXQUOTAS; i++) {
1661                 if (EXT4_SB(sb)->s_qf_names[i]) {
1662                         int ret = ext4_quota_on_mount(sb, i);
1663                         if (ret < 0)
1664                                 printk(KERN_ERR
1665                                         "EXT4-fs: Cannot turn on journaled "
1666                                         "quota: error %d\n", ret);
1667                 }
1668         }
1669 #endif
1670
1671         while (es->s_last_orphan) {
1672                 struct inode *inode;
1673
1674                 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1675                 if (IS_ERR(inode)) {
1676                         es->s_last_orphan = 0;
1677                         break;
1678                 }
1679
1680                 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1681                 DQUOT_INIT(inode);
1682                 if (inode->i_nlink) {
1683                         printk(KERN_DEBUG
1684                                 "%s: truncating inode %lu to %Ld bytes\n",
1685                                 __func__, inode->i_ino, inode->i_size);
1686                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1687                                   inode->i_ino, inode->i_size);
1688                         ext4_truncate(inode);
1689                         nr_truncates++;
1690                 } else {
1691                         printk(KERN_DEBUG
1692                                 "%s: deleting unreferenced inode %lu\n",
1693                                 __func__, inode->i_ino);
1694                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1695                                   inode->i_ino);
1696                         nr_orphans++;
1697                 }
1698                 iput(inode);  /* The delete magic happens here! */
1699         }
1700
1701 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1702
1703         if (nr_orphans)
1704                 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1705                        sb->s_id, PLURAL(nr_orphans));
1706         if (nr_truncates)
1707                 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1708                        sb->s_id, PLURAL(nr_truncates));
1709 #ifdef CONFIG_QUOTA
1710         /* Turn quotas off */
1711         for (i = 0; i < MAXQUOTAS; i++) {
1712                 if (sb_dqopt(sb)->files[i])
1713                         vfs_quota_off(sb, i, 0);
1714         }
1715 #endif
1716         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1717 }
1718 /*
1719  * Maximal extent format file size.
1720  * Resulting logical blkno at s_maxbytes must fit in our on-disk
1721  * extent format containers, within a sector_t, and within i_blocks
1722  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
1723  * so that won't be a limiting factor.
1724  *
1725  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1726  */
1727 static loff_t ext4_max_size(int blkbits)
1728 {
1729         loff_t res;
1730         loff_t upper_limit = MAX_LFS_FILESIZE;
1731
1732         /* small i_blocks in vfs inode? */
1733         if (sizeof(blkcnt_t) < sizeof(u64)) {
1734                 /*
1735                  * CONFIG_LSF is not enabled implies the inode
1736                  * i_block represent total blocks in 512 bytes
1737                  * 32 == size of vfs inode i_blocks * 8
1738                  */
1739                 upper_limit = (1LL << 32) - 1;
1740
1741                 /* total blocks in file system block size */
1742                 upper_limit >>= (blkbits - 9);
1743                 upper_limit <<= blkbits;
1744         }
1745
1746         /* 32-bit extent-start container, ee_block */
1747         res = 1LL << 32;
1748         res <<= blkbits;
1749         res -= 1;
1750
1751         /* Sanity check against vm- & vfs- imposed limits */
1752         if (res > upper_limit)
1753                 res = upper_limit;
1754
1755         return res;
1756 }
1757
1758 /*
1759  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
1760  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1761  * We need to be 1 filesystem block less than the 2^48 sector limit.
1762  */
1763 static loff_t ext4_max_bitmap_size(int bits)
1764 {
1765         loff_t res = EXT4_NDIR_BLOCKS;
1766         int meta_blocks;
1767         loff_t upper_limit;
1768         /* This is calculated to be the largest file size for a
1769          * dense, bitmapped file such that the total number of
1770          * sectors in the file, including data and all indirect blocks,
1771          * does not exceed 2^48 -1
1772          * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1773          * total number of  512 bytes blocks of the file
1774          */
1775
1776         if (sizeof(blkcnt_t) < sizeof(u64)) {
1777                 /*
1778                  * CONFIG_LSF is not enabled implies the inode
1779                  * i_block represent total blocks in 512 bytes
1780                  * 32 == size of vfs inode i_blocks * 8
1781                  */
1782                 upper_limit = (1LL << 32) - 1;
1783
1784                 /* total blocks in file system block size */
1785                 upper_limit >>= (bits - 9);
1786
1787         } else {
1788                 /*
1789                  * We use 48 bit ext4_inode i_blocks
1790                  * With EXT4_HUGE_FILE_FL set the i_blocks
1791                  * represent total number of blocks in
1792                  * file system block size
1793                  */
1794                 upper_limit = (1LL << 48) - 1;
1795
1796         }
1797
1798         /* indirect blocks */
1799         meta_blocks = 1;
1800         /* double indirect blocks */
1801         meta_blocks += 1 + (1LL << (bits-2));
1802         /* tripple indirect blocks */
1803         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1804
1805         upper_limit -= meta_blocks;
1806         upper_limit <<= bits;
1807
1808         res += 1LL << (bits-2);
1809         res += 1LL << (2*(bits-2));
1810         res += 1LL << (3*(bits-2));
1811         res <<= bits;
1812         if (res > upper_limit)
1813                 res = upper_limit;
1814
1815         if (res > MAX_LFS_FILESIZE)
1816                 res = MAX_LFS_FILESIZE;
1817
1818         return res;
1819 }
1820
1821 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1822                                 ext4_fsblk_t logical_sb_block, int nr)
1823 {
1824         struct ext4_sb_info *sbi = EXT4_SB(sb);
1825         ext4_group_t bg, first_meta_bg;
1826         int has_super = 0;
1827
1828         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1829
1830         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1831             nr < first_meta_bg)
1832                 return logical_sb_block + nr + 1;
1833         bg = sbi->s_desc_per_block * nr;
1834         if (ext4_bg_has_super(sb, bg))
1835                 has_super = 1;
1836         return (has_super + ext4_group_first_block_no(sb, bg));
1837 }
1838
1839 /**
1840  * ext4_get_stripe_size: Get the stripe size.
1841  * @sbi: In memory super block info
1842  *
1843  * If we have specified it via mount option, then
1844  * use the mount option value. If the value specified at mount time is
1845  * greater than the blocks per group use the super block value.
1846  * If the super block value is greater than blocks per group return 0.
1847  * Allocator needs it be less than blocks per group.
1848  *
1849  */
1850 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1851 {
1852         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1853         unsigned long stripe_width =
1854                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1855
1856         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1857                 return sbi->s_stripe;
1858
1859         if (stripe_width <= sbi->s_blocks_per_group)
1860                 return stripe_width;
1861
1862         if (stride <= sbi->s_blocks_per_group)
1863                 return stride;
1864
1865         return 0;
1866 }
1867
1868 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1869                                 __releases(kernel_lock)
1870                                 __acquires(kernel_lock)
1871
1872 {
1873         struct buffer_head * bh;
1874         struct ext4_super_block *es = NULL;
1875         struct ext4_sb_info *sbi;
1876         ext4_fsblk_t block;
1877         ext4_fsblk_t sb_block = get_sb_block(&data);
1878         ext4_fsblk_t logical_sb_block;
1879         unsigned long offset = 0;
1880         unsigned int journal_inum = 0;
1881         unsigned long journal_devnum = 0;
1882         unsigned long def_mount_opts;
1883         struct inode *root;
1884         int ret = -EINVAL;
1885         int blocksize;
1886         int db_count;
1887         int i;
1888         int needs_recovery;
1889         __le32 features;
1890         __u64 blocks_count;
1891         int err;
1892
1893         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1894         if (!sbi)
1895                 return -ENOMEM;
1896         sb->s_fs_info = sbi;
1897         sbi->s_mount_opt = 0;
1898         sbi->s_resuid = EXT4_DEF_RESUID;
1899         sbi->s_resgid = EXT4_DEF_RESGID;
1900         sbi->s_sb_block = sb_block;
1901
1902         unlock_kernel();
1903
1904         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1905         if (!blocksize) {
1906                 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1907                 goto out_fail;
1908         }
1909
1910         /*
1911          * The ext4 superblock will not be buffer aligned for other than 1kB
1912          * block sizes.  We need to calculate the offset from buffer start.
1913          */
1914         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1915                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1916                 offset = do_div(logical_sb_block, blocksize);
1917         } else {
1918                 logical_sb_block = sb_block;
1919         }
1920
1921         if (!(bh = sb_bread(sb, logical_sb_block))) {
1922                 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1923                 goto out_fail;
1924         }
1925         /*
1926          * Note: s_es must be initialized as soon as possible because
1927          *       some ext4 macro-instructions depend on its value
1928          */
1929         es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1930         sbi->s_es = es;
1931         sb->s_magic = le16_to_cpu(es->s_magic);
1932         if (sb->s_magic != EXT4_SUPER_MAGIC)
1933                 goto cantfind_ext4;
1934
1935         /* Set defaults before we parse the mount options */
1936         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1937         if (def_mount_opts & EXT4_DEFM_DEBUG)
1938                 set_opt(sbi->s_mount_opt, DEBUG);
1939         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1940                 set_opt(sbi->s_mount_opt, GRPID);
1941         if (def_mount_opts & EXT4_DEFM_UID16)
1942                 set_opt(sbi->s_mount_opt, NO_UID32);
1943 #ifdef CONFIG_EXT4DEV_FS_XATTR
1944         if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1945                 set_opt(sbi->s_mount_opt, XATTR_USER);
1946 #endif
1947 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1948         if (def_mount_opts & EXT4_DEFM_ACL)
1949                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1950 #endif
1951         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1952                 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1953         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1954                 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1955         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1956                 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1957
1958         if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1959                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1960         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
1961                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1962         else
1963                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1964
1965         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1966         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1967
1968         set_opt(sbi->s_mount_opt, RESERVATION);
1969         set_opt(sbi->s_mount_opt, BARRIER);
1970
1971         /*
1972          * turn on extents feature by default in ext4 filesystem
1973          * User -o noextents to turn it off
1974          */
1975         set_opt(sbi->s_mount_opt, EXTENTS);
1976         /*
1977          * turn on mballoc feature by default in ext4 filesystem
1978          * User -o nomballoc to turn it off
1979          */
1980         set_opt(sbi->s_mount_opt, MBALLOC);
1981
1982         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1983                             NULL, 0))
1984                 goto failed_mount;
1985
1986         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1987                 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1988
1989         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1990             (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1991              EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1992              EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1993                 printk(KERN_WARNING
1994                        "EXT4-fs warning: feature flags set on rev 0 fs, "
1995                        "running e2fsck is recommended\n");
1996
1997         /*
1998          * Since ext4 is still considered development code, we require
1999          * that the TEST_FILESYS flag in s->flags be set.
2000          */
2001         if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2002                 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2003                        "OK to use with test code.\n", sb->s_id);
2004                 goto failed_mount;
2005         }
2006
2007         /*
2008          * Check feature flags regardless of the revision level, since we
2009          * previously didn't change the revision level when setting the flags,
2010          * so there is a chance incompat flags are set on a rev 0 filesystem.
2011          */
2012         features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2013         if (features) {
2014                 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2015                        "unsupported optional features (%x).\n",
2016                        sb->s_id, le32_to_cpu(features));
2017                 goto failed_mount;
2018         }
2019         features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2020         if (!(sb->s_flags & MS_RDONLY) && features) {
2021                 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2022                        "unsupported optional features (%x).\n",
2023                        sb->s_id, le32_to_cpu(features));
2024                 goto failed_mount;
2025         }
2026         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2027                 /*
2028                  * Large file size enabled file system can only be
2029                  * mount if kernel is build with CONFIG_LSF
2030                  */
2031                 if (sizeof(root->i_blocks) < sizeof(u64) &&
2032                                 !(sb->s_flags & MS_RDONLY)) {
2033                         printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2034                                         "files cannot be mounted read-write "
2035                                         "without CONFIG_LSF.\n", sb->s_id);
2036                         goto failed_mount;
2037                 }
2038         }
2039         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2040
2041         if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2042             blocksize > EXT4_MAX_BLOCK_SIZE) {
2043                 printk(KERN_ERR
2044                        "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2045                        blocksize, sb->s_id);
2046                 goto failed_mount;
2047         }
2048
2049         if (sb->s_blocksize != blocksize) {
2050
2051                 /* Validate the filesystem blocksize */
2052                 if (!sb_set_blocksize(sb, blocksize)) {
2053                         printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2054                                         blocksize);
2055                         goto failed_mount;
2056                 }
2057
2058                 brelse (bh);
2059                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2060                 offset = do_div(logical_sb_block, blocksize);
2061                 bh = sb_bread(sb, logical_sb_block);
2062                 if (!bh) {
2063                         printk(KERN_ERR
2064                                "EXT4-fs: Can't read superblock on 2nd try.\n");
2065                         goto failed_mount;
2066                 }
2067                 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2068                 sbi->s_es = es;
2069                 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2070                         printk (KERN_ERR
2071                                 "EXT4-fs: Magic mismatch, very weird !\n");
2072                         goto failed_mount;
2073                 }
2074         }
2075
2076         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
2077         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
2078
2079         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2080                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2081                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2082         } else {
2083                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2084                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2085                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2086                     (!is_power_of_2(sbi->s_inode_size)) ||
2087                     (sbi->s_inode_size > blocksize)) {
2088                         printk (KERN_ERR
2089                                 "EXT4-fs: unsupported inode size: %d\n",
2090                                 sbi->s_inode_size);
2091                         goto failed_mount;
2092                 }
2093                 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2094                         sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2095         }
2096         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2097         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2098                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2099                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2100                     !is_power_of_2(sbi->s_desc_size)) {
2101                         printk(KERN_ERR
2102                                "EXT4-fs: unsupported descriptor size %lu\n",
2103                                sbi->s_desc_size);
2104                         goto failed_mount;
2105                 }
2106         } else
2107                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2108         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2109         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2110         if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2111                 goto cantfind_ext4;
2112         sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2113         if (sbi->s_inodes_per_block == 0)
2114                 goto cantfind_ext4;
2115         sbi->s_itb_per_group = sbi->s_inodes_per_group /
2116                                         sbi->s_inodes_per_block;
2117         sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2118         sbi->s_sbh = bh;
2119         sbi->s_mount_state = le16_to_cpu(es->s_state);
2120         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2121         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2122         for (i=0; i < 4; i++)
2123                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2124         sbi->s_def_hash_version = es->s_def_hash_version;
2125
2126         if (sbi->s_blocks_per_group > blocksize * 8) {
2127                 printk (KERN_ERR
2128                         "EXT4-fs: #blocks per group too big: %lu\n",
2129                         sbi->s_blocks_per_group);
2130                 goto failed_mount;
2131         }
2132         if (sbi->s_inodes_per_group > blocksize * 8) {
2133                 printk (KERN_ERR
2134                         "EXT4-fs: #inodes per group too big: %lu\n",
2135                         sbi->s_inodes_per_group);
2136                 goto failed_mount;
2137         }
2138
2139         if (ext4_blocks_count(es) >
2140                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2141                 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2142                         " too large to mount safely\n", sb->s_id);
2143                 if (sizeof(sector_t) < 8)
2144                         printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2145                                         "enabled\n");
2146                 goto failed_mount;
2147         }
2148
2149         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2150                 goto cantfind_ext4;
2151
2152         /* ensure blocks_count calculation below doesn't sign-extend */
2153         if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2154             le32_to_cpu(es->s_first_data_block) + 1) {
2155                 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2156                        "first data block %u, blocks per group %lu\n",
2157                         ext4_blocks_count(es),
2158                         le32_to_cpu(es->s_first_data_block),
2159                         EXT4_BLOCKS_PER_GROUP(sb));
2160                 goto failed_mount;
2161         }
2162         blocks_count = (ext4_blocks_count(es) -
2163                         le32_to_cpu(es->s_first_data_block) +
2164                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
2165         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2166         sbi->s_groups_count = blocks_count;
2167         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2168                    EXT4_DESC_PER_BLOCK(sb);
2169         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2170                                     GFP_KERNEL);
2171         if (sbi->s_group_desc == NULL) {
2172                 printk (KERN_ERR "EXT4-fs: not enough memory\n");
2173                 goto failed_mount;
2174         }
2175
2176         bgl_lock_init(&sbi->s_blockgroup_lock);
2177
2178         for (i = 0; i < db_count; i++) {
2179                 block = descriptor_loc(sb, logical_sb_block, i);
2180                 sbi->s_group_desc[i] = sb_bread(sb, block);
2181                 if (!sbi->s_group_desc[i]) {
2182                         printk (KERN_ERR "EXT4-fs: "
2183                                 "can't read group descriptor %d\n", i);
2184                         db_count = i;
2185                         goto failed_mount2;
2186                 }
2187         }
2188         if (!ext4_check_descriptors (sb)) {
2189                 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2190                 goto failed_mount2;
2191         }
2192         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2193                 if (!ext4_fill_flex_info(sb)) {
2194                         printk(KERN_ERR
2195                                "EXT4-fs: unable to initialize "
2196                                "flex_bg meta info!\n");
2197                         goto failed_mount2;
2198                 }
2199
2200         sbi->s_gdb_count = db_count;
2201         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2202         spin_lock_init(&sbi->s_next_gen_lock);
2203
2204         err = percpu_counter_init(&sbi->s_freeblocks_counter,
2205                         ext4_count_free_blocks(sb));
2206         if (!err) {
2207                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2208                                 ext4_count_free_inodes(sb));
2209         }
2210         if (!err) {
2211                 err = percpu_counter_init(&sbi->s_dirs_counter,
2212                                 ext4_count_dirs(sb));
2213         }
2214         if (err) {
2215                 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2216                 goto failed_mount3;
2217         }
2218
2219         /* per fileystem reservation list head & lock */
2220         spin_lock_init(&sbi->s_rsv_window_lock);
2221         sbi->s_rsv_window_root = RB_ROOT;
2222         /* Add a single, static dummy reservation to the start of the
2223          * reservation window list --- it gives us a placeholder for
2224          * append-at-start-of-list which makes the allocation logic
2225          * _much_ simpler. */
2226         sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2227         sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2228         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2229         sbi->s_rsv_window_head.rsv_goal_size = 0;
2230         ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
2231
2232         sbi->s_stripe = ext4_get_stripe_size(sbi);
2233
2234         /*
2235          * set up enough so that it can read an inode
2236          */
2237         sb->s_op = &ext4_sops;
2238         sb->s_export_op = &ext4_export_ops;
2239         sb->s_xattr = ext4_xattr_handlers;
2240 #ifdef CONFIG_QUOTA
2241         sb->s_qcop = &ext4_qctl_operations;
2242         sb->dq_op = &ext4_quota_operations;
2243 #endif
2244         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2245
2246         sb->s_root = NULL;
2247
2248         needs_recovery = (es->s_last_orphan != 0 ||
2249                           EXT4_HAS_INCOMPAT_FEATURE(sb,
2250                                     EXT4_FEATURE_INCOMPAT_RECOVER));
2251
2252         /*
2253          * The first inode we look at is the journal inode.  Don't try
2254          * root first: it may be modified in the journal!
2255          */
2256         if (!test_opt(sb, NOLOAD) &&
2257             EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2258                 if (ext4_load_journal(sb, es, journal_devnum))
2259                         goto failed_mount3;
2260                 if (!(sb->s_flags & MS_RDONLY) &&
2261                     EXT4_SB(sb)->s_journal->j_failed_commit) {
2262                         printk(KERN_CRIT "EXT4-fs error (device %s): "
2263                                "ext4_fill_super: Journal transaction "
2264                                "%u is corrupt\n", sb->s_id,
2265                                EXT4_SB(sb)->s_journal->j_failed_commit);
2266                         if (test_opt (sb, ERRORS_RO)) {
2267                                 printk (KERN_CRIT
2268                                         "Mounting filesystem read-only\n");
2269                                 sb->s_flags |= MS_RDONLY;
2270                                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2271                                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2272                         }
2273                         if (test_opt(sb, ERRORS_PANIC)) {
2274                                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2275                                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2276                                 ext4_commit_super(sb, es, 1);
2277                                 printk(KERN_CRIT
2278                                        "EXT4-fs (device %s): mount failed\n",
2279                                       sb->s_id);
2280                                 goto failed_mount4;
2281                         }
2282                 }
2283         } else if (journal_inum) {
2284                 if (ext4_create_journal(sb, es, journal_inum))
2285                         goto failed_mount3;
2286         } else {
2287                 if (!silent)
2288                         printk (KERN_ERR
2289                                 "ext4: No journal on filesystem on %s\n",
2290                                 sb->s_id);
2291                 goto failed_mount3;
2292         }
2293
2294         if (ext4_blocks_count(es) > 0xffffffffULL &&
2295             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2296                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
2297                 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2298                 goto failed_mount4;
2299         }
2300
2301         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2302                 jbd2_journal_set_features(sbi->s_journal,
2303                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2304                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2305         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2306                 jbd2_journal_set_features(sbi->s_journal,
2307                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2308                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2309                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2310         } else {
2311                 jbd2_journal_clear_features(sbi->s_journal,
2312                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2313                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2314         }
2315
2316         /* We have now updated the journal if required, so we can
2317          * validate the data journaling mode. */
2318         switch (test_opt(sb, DATA_FLAGS)) {
2319         case 0:
2320                 /* No mode set, assume a default based on the journal
2321                  * capabilities: ORDERED_DATA if the journal can
2322                  * cope, else JOURNAL_DATA
2323                  */
2324                 if (jbd2_journal_check_available_features
2325                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2326                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
2327                 else
2328                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2329                 break;
2330
2331         case EXT4_MOUNT_ORDERED_DATA:
2332         case EXT4_MOUNT_WRITEBACK_DATA:
2333                 if (!jbd2_journal_check_available_features
2334                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2335                         printk(KERN_ERR "EXT4-fs: Journal does not support "
2336                                "requested data journaling mode\n");
2337                         goto failed_mount4;
2338                 }
2339         default:
2340                 break;
2341         }
2342
2343         if (test_opt(sb, NOBH)) {
2344                 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2345                         printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2346                                 "its supported only with writeback mode\n");
2347                         clear_opt(sbi->s_mount_opt, NOBH);
2348                 }
2349         }
2350         /*
2351          * The jbd2_journal_load will have done any necessary log recovery,
2352          * so we can safely mount the rest of the filesystem now.
2353          */
2354
2355         root = ext4_iget(sb, EXT4_ROOT_INO);
2356         if (IS_ERR(root)) {
2357                 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2358                 ret = PTR_ERR(root);
2359                 goto failed_mount4;
2360         }
2361         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2362                 iput(root);
2363                 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2364                 goto failed_mount4;
2365         }
2366         sb->s_root = d_alloc_root(root);
2367         if (!sb->s_root) {
2368                 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2369                 iput(root);
2370                 ret = -ENOMEM;
2371                 goto failed_mount4;
2372         }
2373
2374         ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2375
2376         /* determine the minimum size of new large inodes, if present */
2377         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2378                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2379                                                      EXT4_GOOD_OLD_INODE_SIZE;
2380                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2381                                        EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2382                         if (sbi->s_want_extra_isize <
2383                             le16_to_cpu(es->s_want_extra_isize))
2384                                 sbi->s_want_extra_isize =
2385                                         le16_to_cpu(es->s_want_extra_isize);
2386                         if (sbi->s_want_extra_isize <
2387                             le16_to_cpu(es->s_min_extra_isize))
2388                                 sbi->s_want_extra_isize =
2389                                         le16_to_cpu(es->s_min_extra_isize);
2390                 }
2391         }
2392         /* Check if enough inode space is available */
2393         if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2394                                                         sbi->s_inode_size) {
2395                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2396                                                        EXT4_GOOD_OLD_INODE_SIZE;
2397                 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2398                         "available.\n");
2399         }
2400
2401         /*
2402          * akpm: core read_super() calls in here with the superblock locked.
2403          * That deadlocks, because orphan cleanup needs to lock the superblock
2404          * in numerous places.  Here we just pop the lock - it's relatively
2405          * harmless, because we are now ready to accept write_super() requests,
2406          * and aviro says that's the only reason for hanging onto the
2407          * superblock lock.
2408          */
2409         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2410         ext4_orphan_cleanup(sb, es);
2411         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2412         if (needs_recovery)
2413                 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2414         ext4_mark_recovery_complete(sb, es);
2415         printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2416                 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2417                 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2418                 "writeback");
2419
2420         ext4_ext_init(sb);
2421         ext4_mb_init(sb, needs_recovery);
2422
2423         lock_kernel();
2424         return 0;
2425
2426 cantfind_ext4:
2427         if (!silent)
2428                 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2429                        sb->s_id);
2430         goto failed_mount;
2431
2432 failed_mount4:
2433         jbd2_journal_destroy(sbi->s_journal);
2434         sbi->s_journal = NULL;
2435 failed_mount3:
2436         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2437         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2438         percpu_counter_destroy(&sbi->s_dirs_counter);
2439 failed_mount2:
2440         for (i = 0; i < db_count; i++)
2441                 brelse(sbi->s_group_desc[i]);
2442         kfree(sbi->s_group_desc);
2443 failed_mount:
2444 #ifdef CONFIG_QUOTA
2445         for (i = 0; i < MAXQUOTAS; i++)
2446                 kfree(sbi->s_qf_names[i]);
2447 #endif
2448         ext4_blkdev_remove(sbi);
2449         brelse(bh);
2450 out_fail:
2451         sb->s_fs_info = NULL;
2452         kfree(sbi);
2453         lock_kernel();
2454         return ret;
2455 }
2456
2457 /*
2458  * Setup any per-fs journal parameters now.  We'll do this both on
2459  * initial mount, once the journal has been initialised but before we've
2460  * done any recovery; and again on any subsequent remount.
2461  */
2462 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2463 {
2464         struct ext4_sb_info *sbi = EXT4_SB(sb);
2465
2466         if (sbi->s_commit_interval)
2467                 journal->j_commit_interval = sbi->s_commit_interval;
2468         /* We could also set up an ext4-specific default for the commit
2469          * interval here, but for now we'll just fall back to the jbd
2470          * default. */
2471
2472         spin_lock(&journal->j_state_lock);
2473         if (test_opt(sb, BARRIER))
2474                 journal->j_flags |= JBD2_BARRIER;
2475         else
2476                 journal->j_flags &= ~JBD2_BARRIER;
2477         spin_unlock(&journal->j_state_lock);
2478 }
2479
2480 static journal_t *ext4_get_journal(struct super_block *sb,
2481                                    unsigned int journal_inum)
2482 {
2483         struct inode *journal_inode;
2484         journal_t *journal;
2485
2486         /* First, test for the existence of a valid inode on disk.  Bad
2487          * things happen if we iget() an unused inode, as the subsequent
2488          * iput() will try to delete it. */
2489
2490         journal_inode = ext4_iget(sb, journal_inum);
2491         if (IS_ERR(journal_inode)) {
2492                 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2493                 return NULL;
2494         }
2495         if (!journal_inode->i_nlink) {
2496                 make_bad_inode(journal_inode);
2497                 iput(journal_inode);
2498                 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2499                 return NULL;
2500         }
2501
2502         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2503                   journal_inode, journal_inode->i_size);
2504         if (!S_ISREG(journal_inode->i_mode)) {
2505                 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2506                 iput(journal_inode);
2507                 return NULL;
2508         }
2509
2510         journal = jbd2_journal_init_inode(journal_inode);
2511         if (!journal) {
2512                 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2513                 iput(journal_inode);
2514                 return NULL;
2515         }
2516         journal->j_private = sb;
2517         ext4_init_journal_params(sb, journal);
2518         return journal;
2519 }
2520
2521 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2522                                        dev_t j_dev)
2523 {
2524         struct buffer_head * bh;
2525         journal_t *journal;
2526         ext4_fsblk_t start;
2527         ext4_fsblk_t len;
2528         int hblock, blocksize;
2529         ext4_fsblk_t sb_block;
2530         unsigned long offset;
2531         struct ext4_super_block * es;
2532         struct block_device *bdev;
2533
2534         bdev = ext4_blkdev_get(j_dev);
2535         if (bdev == NULL)
2536                 return NULL;
2537
2538         if (bd_claim(bdev, sb)) {
2539                 printk(KERN_ERR
2540                         "EXT4: failed to claim external journal device.\n");
2541                 blkdev_put(bdev);
2542                 return NULL;
2543         }
2544
2545         blocksize = sb->s_blocksize;
2546         hblock = bdev_hardsect_size(bdev);
2547         if (blocksize < hblock) {
2548                 printk(KERN_ERR
2549                         "EXT4-fs: blocksize too small for journal device.\n");
2550                 goto out_bdev;
2551         }
2552
2553         sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2554         offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2555         set_blocksize(bdev, blocksize);
2556         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2557                 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2558                        "external journal\n");
2559                 goto out_bdev;
2560         }
2561
2562         es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2563         if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2564             !(le32_to_cpu(es->s_feature_incompat) &
2565               EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2566                 printk(KERN_ERR "EXT4-fs: external journal has "
2567                                         "bad superblock\n");
2568                 brelse(bh);
2569                 goto out_bdev;
2570         }
2571
2572         if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2573                 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2574                 brelse(bh);
2575                 goto out_bdev;
2576         }
2577
2578         len = ext4_blocks_count(es);
2579         start = sb_block + 1;
2580         brelse(bh);     /* we're done with the superblock */
2581
2582         journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2583                                         start, len, blocksize);
2584         if (!journal) {
2585                 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2586                 goto out_bdev;
2587         }
2588         journal->j_private = sb;
2589         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2590         wait_on_buffer(journal->j_sb_buffer);
2591         if (!buffer_uptodate(journal->j_sb_buffer)) {
2592                 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2593                 goto out_journal;
2594         }
2595         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2596                 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2597                                         "user (unsupported) - %d\n",
2598                         be32_to_cpu(journal->j_superblock->s_nr_users));
2599                 goto out_journal;
2600         }
2601         EXT4_SB(sb)->journal_bdev = bdev;
2602         ext4_init_journal_params(sb, journal);
2603         return journal;
2604 out_journal:
2605         jbd2_journal_destroy(journal);
2606 out_bdev:
2607         ext4_blkdev_put(bdev);
2608         return NULL;
2609 }
2610
2611 static int ext4_load_journal(struct super_block *sb,
2612                              struct ext4_super_block *es,
2613                              unsigned long journal_devnum)
2614 {
2615         journal_t *journal;
2616         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2617         dev_t journal_dev;
2618         int err = 0;
2619         int really_read_only;
2620
2621         if (journal_devnum &&
2622             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2623                 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2624                         "numbers have changed\n");
2625                 journal_dev = new_decode_dev(journal_devnum);
2626         } else
2627                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2628
2629         really_read_only = bdev_read_only(sb->s_bdev);
2630
2631         /*
2632          * Are we loading a blank journal or performing recovery after a
2633          * crash?  For recovery, we need to check in advance whether we
2634          * can get read-write access to the device.
2635          */
2636
2637         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2638                 if (sb->s_flags & MS_RDONLY) {
2639                         printk(KERN_INFO "EXT4-fs: INFO: recovery "
2640                                         "required on readonly filesystem.\n");
2641                         if (really_read_only) {
2642                                 printk(KERN_ERR "EXT4-fs: write access "
2643                                         "unavailable, cannot proceed.\n");
2644                                 return -EROFS;
2645                         }
2646                         printk (KERN_INFO "EXT4-fs: write access will "
2647                                         "be enabled during recovery.\n");
2648                 }
2649         }
2650
2651         if (journal_inum && journal_dev) {
2652                 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2653                        "and inode journals!\n");
2654                 return -EINVAL;
2655         }
2656
2657         if (journal_inum) {
2658                 if (!(journal = ext4_get_journal(sb, journal_inum)))
2659                         return -EINVAL;
2660         } else {
2661                 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2662                         return -EINVAL;
2663         }
2664
2665         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2666                 err = jbd2_journal_update_format(journal);
2667                 if (err)  {
2668                         printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2669                         jbd2_journal_destroy(journal);
2670                         return err;
2671                 }
2672         }
2673
2674         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2675                 err = jbd2_journal_wipe(journal, !really_read_only);
2676         if (!err)
2677                 err = jbd2_journal_load(journal);
2678
2679         if (err) {
2680                 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2681                 jbd2_journal_destroy(journal);
2682                 return err;
2683         }
2684
2685         EXT4_SB(sb)->s_journal = journal;
2686         ext4_clear_journal_err(sb, es);
2687
2688         if (journal_devnum &&
2689             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2690                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2691                 sb->s_dirt = 1;
2692
2693                 /* Make sure we flush the recovery flag to disk. */
2694                 ext4_commit_super(sb, es, 1);
2695         }
2696
2697         return 0;
2698 }
2699
2700 static int ext4_create_journal(struct super_block * sb,
2701                                struct ext4_super_block * es,
2702                                unsigned int journal_inum)
2703 {
2704         journal_t *journal;
2705         int err;
2706
2707         if (sb->s_flags & MS_RDONLY) {
2708                 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2709                                 "create journal.\n");
2710                 return -EROFS;
2711         }
2712
2713         journal = ext4_get_journal(sb, journal_inum);
2714         if (!journal)
2715                 return -EINVAL;
2716
2717         printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2718                journal_inum);
2719
2720         err = jbd2_journal_create(journal);
2721         if (err) {
2722                 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2723                 jbd2_journal_destroy(journal);
2724                 return -EIO;
2725         }
2726
2727         EXT4_SB(sb)->s_journal = journal;
2728
2729         ext4_update_dynamic_rev(sb);
2730         EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2731         EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2732
2733         es->s_journal_inum = cpu_to_le32(journal_inum);
2734         sb->s_dirt = 1;
2735
2736         /* Make sure we flush the recovery flag to disk. */
2737         ext4_commit_super(sb, es, 1);
2738
2739         return 0;
2740 }
2741
2742 static void ext4_commit_super (struct super_block * sb,
2743                                struct ext4_super_block * es,
2744                                int sync)
2745 {
2746         struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2747
2748         if (!sbh)
2749                 return;
2750         es->s_wtime = cpu_to_le32(get_seconds());
2751         ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2752         es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2753         BUFFER_TRACE(sbh, "marking dirty");
2754         mark_buffer_dirty(sbh);
2755         if (sync)
2756                 sync_dirty_buffer(sbh);
2757 }
2758
2759
2760 /*
2761  * Have we just finished recovery?  If so, and if we are mounting (or
2762  * remounting) the filesystem readonly, then we will end up with a
2763  * consistent fs on disk.  Record that fact.
2764  */
2765 static void ext4_mark_recovery_complete(struct super_block * sb,
2766                                         struct ext4_super_block * es)
2767 {
2768         journal_t *journal = EXT4_SB(sb)->s_journal;
2769
2770         jbd2_journal_lock_updates(journal);
2771         jbd2_journal_flush(journal);
2772         lock_super(sb);
2773         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2774             sb->s_flags & MS_RDONLY) {
2775                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2776                 sb->s_dirt = 0;
2777                 ext4_commit_super(sb, es, 1);
2778         }
2779         unlock_super(sb);
2780         jbd2_journal_unlock_updates(journal);
2781 }
2782
2783 /*
2784  * If we are mounting (or read-write remounting) a filesystem whose journal
2785  * has recorded an error from a previous lifetime, move that error to the
2786  * main filesystem now.
2787  */
2788 static void ext4_clear_journal_err(struct super_block * sb,
2789                                    struct ext4_super_block * es)
2790 {
2791         journal_t *journal;
2792         int j_errno;
2793         const char *errstr;
2794
2795         journal = EXT4_SB(sb)->s_journal;
2796
2797         /*
2798          * Now check for any error status which may have been recorded in the
2799          * journal by a prior ext4_error() or ext4_abort()
2800          */
2801
2802         j_errno = jbd2_journal_errno(journal);
2803         if (j_errno) {
2804                 char nbuf[16];
2805
2806                 errstr = ext4_decode_error(sb, j_errno, nbuf);
2807                 ext4_warning(sb, __func__, "Filesystem error recorded "
2808                              "from previous mount: %s", errstr);
2809                 ext4_warning(sb, __func__, "Marking fs in need of "
2810                              "filesystem check.");
2811
2812                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2813                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2814                 ext4_commit_super (sb, es, 1);
2815
2816                 jbd2_journal_clear_err(journal);
2817         }
2818 }
2819
2820 /*
2821  * Force the running and committing transactions to commit,
2822  * and wait on the commit.
2823  */
2824 int ext4_force_commit(struct super_block *sb)
2825 {
2826         journal_t *journal;
2827         int ret;
2828
2829         if (sb->s_flags & MS_RDONLY)
2830                 return 0;
2831
2832         journal = EXT4_SB(sb)->s_journal;
2833         sb->s_dirt = 0;
2834         ret = ext4_journal_force_commit(journal);
2835         return ret;
2836 }
2837
2838 /*
2839  * Ext4 always journals updates to the superblock itself, so we don't
2840  * have to propagate any other updates to the superblock on disk at this
2841  * point.  Just start an async writeback to get the buffers on their way
2842  * to the disk.
2843  *
2844  * This implicitly triggers the writebehind on sync().
2845  */
2846
2847 static void ext4_write_super (struct super_block * sb)
2848 {
2849         if (mutex_trylock(&sb->s_lock) != 0)
2850                 BUG();
2851         sb->s_dirt = 0;
2852 }
2853
2854 static int ext4_sync_fs(struct super_block *sb, int wait)
2855 {
2856         tid_t target;
2857
2858         sb->s_dirt = 0;
2859         if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2860                 if (wait)
2861                         jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2862         }
2863         return 0;
2864 }
2865
2866 /*
2867  * LVM calls this function before a (read-only) snapshot is created.  This
2868  * gives us a chance to flush the journal completely and mark the fs clean.
2869  */
2870 static void ext4_write_super_lockfs(struct super_block *sb)
2871 {
2872         sb->s_dirt = 0;
2873
2874         if (!(sb->s_flags & MS_RDONLY)) {
2875                 journal_t *journal = EXT4_SB(sb)->s_journal;
2876
2877                 /* Now we set up the journal barrier. */
2878                 jbd2_journal_lock_updates(journal);
2879                 jbd2_journal_flush(journal);
2880
2881                 /* Journal blocked and flushed, clear needs_recovery flag. */
2882                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2883                 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2884         }
2885 }
2886
2887 /*
2888  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2889  * flag here, even though the filesystem is not technically dirty yet.
2890  */
2891 static void ext4_unlockfs(struct super_block *sb)
2892 {
2893         if (!(sb->s_flags & MS_RDONLY)) {
2894                 lock_super(sb);
2895                 /* Reser the needs_recovery flag before the fs is unlocked. */
2896                 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2897                 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2898                 unlock_super(sb);
2899                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2900         }
2901 }
2902
2903 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2904 {
2905         struct ext4_super_block * es;
2906         struct ext4_sb_info *sbi = EXT4_SB(sb);
2907         ext4_fsblk_t n_blocks_count = 0;
2908         unsigned long old_sb_flags;
2909         struct ext4_mount_options old_opts;
2910         int err;
2911 #ifdef CONFIG_QUOTA
2912         int i;
2913 #endif
2914
2915         /* Store the original options */
2916         old_sb_flags = sb->s_flags;
2917         old_opts.s_mount_opt = sbi->s_mount_opt;
2918         old_opts.s_resuid = sbi->s_resuid;
2919         old_opts.s_resgid = sbi->s_resgid;
2920         old_opts.s_commit_interval = sbi->s_commit_interval;
2921 #ifdef CONFIG_QUOTA
2922         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2923         for (i = 0; i < MAXQUOTAS; i++)
2924                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2925 #endif
2926
2927         /*
2928          * Allow the "check" option to be passed as a remount option.
2929          */
2930         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2931                 err = -EINVAL;
2932                 goto restore_opts;
2933         }
2934
2935         if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2936                 ext4_abort(sb, __func__, "Abort forced by user");
2937
2938         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2939                 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2940
2941         es = sbi->s_es;
2942
2943         ext4_init_journal_params(sb, sbi->s_journal);
2944
2945         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2946                 n_blocks_count > ext4_blocks_count(es)) {
2947                 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2948                         err = -EROFS;
2949                         goto restore_opts;
2950                 }
2951
2952                 if (*flags & MS_RDONLY) {
2953                         /*
2954                          * First of all, the unconditional stuff we have to do
2955                          * to disable replay of the journal when we next remount
2956                          */
2957                         sb->s_flags |= MS_RDONLY;
2958
2959                         /*
2960                          * OK, test if we are remounting a valid rw partition
2961                          * readonly, and if so set the rdonly flag and then
2962                          * mark the partition as valid again.
2963                          */
2964                         if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2965                             (sbi->s_mount_state & EXT4_VALID_FS))
2966                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2967
2968                         /*
2969                          * We have to unlock super so that we can wait for
2970                          * transactions.
2971                          */
2972                         unlock_super(sb);
2973                         ext4_mark_recovery_complete(sb, es);
2974                         lock_super(sb);
2975                 } else {
2976                         __le32 ret;
2977                         if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2978                                         ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2979                                 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2980                                        "remount RDWR because of unsupported "
2981                                        "optional features (%x).\n",
2982                                        sb->s_id, le32_to_cpu(ret));
2983                                 err = -EROFS;
2984                                 goto restore_opts;
2985                         }
2986
2987                         /*
2988                          * If we have an unprocessed orphan list hanging
2989                          * around from a previously readonly bdev mount,
2990                          * require a full umount/remount for now.
2991                          */
2992                         if (es->s_last_orphan) {
2993                                 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2994                                        "remount RDWR because of unprocessed "
2995                                        "orphan inode list.  Please "
2996                                        "umount/remount instead.\n",
2997                                        sb->s_id);
2998                                 err = -EINVAL;
2999                                 goto restore_opts;
3000                         }
3001
3002                         /*
3003                          * Mounting a RDONLY partition read-write, so reread
3004                          * and store the current valid flag.  (It may have
3005                          * been changed by e2fsck since we originally mounted
3006                          * the partition.)
3007                          */
3008                         ext4_clear_journal_err(sb, es);
3009                         sbi->s_mount_state = le16_to_cpu(es->s_state);
3010                         if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3011                                 goto restore_opts;
3012                         if (!ext4_setup_super (sb, es, 0))
3013                                 sb->s_flags &= ~MS_RDONLY;
3014                 }
3015         }
3016 #ifdef CONFIG_QUOTA
3017         /* Release old quota file names */
3018         for (i = 0; i < MAXQUOTAS; i++)
3019                 if (old_opts.s_qf_names[i] &&
3020                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3021                         kfree(old_opts.s_qf_names[i]);
3022 #endif
3023         return 0;
3024 restore_opts:
3025         sb->s_flags = old_sb_flags;
3026         sbi->s_mount_opt = old_opts.s_mount_opt;
3027         sbi->s_resuid = old_opts.s_resuid;
3028         sbi->s_resgid = old_opts.s_resgid;
3029         sbi->s_commit_interval = old_opts.s_commit_interval;
3030 #ifdef CONFIG_QUOTA
3031         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3032         for (i = 0; i < MAXQUOTAS; i++) {
3033                 if (sbi->s_qf_names[i] &&
3034                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3035                         kfree(sbi->s_qf_names[i]);
3036                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3037         }
3038 #endif
3039         return err;
3040 }
3041
3042 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
3043 {
3044         struct super_block *sb = dentry->d_sb;
3045         struct ext4_sb_info *sbi = EXT4_SB(sb);
3046         struct ext4_super_block *es = sbi->s_es;
3047         u64 fsid;
3048
3049         if (test_opt(sb, MINIX_DF)) {
3050                 sbi->s_overhead_last = 0;
3051         } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3052                 ext4_group_t ngroups = sbi->s_groups_count, i;
3053                 ext4_fsblk_t overhead = 0;
3054                 smp_rmb();
3055
3056                 /*
3057                  * Compute the overhead (FS structures).  This is constant
3058                  * for a given filesystem unless the number of block groups
3059                  * changes so we cache the previous value until it does.
3060                  */
3061
3062                 /*
3063                  * All of the blocks before first_data_block are
3064                  * overhead
3065                  */
3066                 overhead = le32_to_cpu(es->s_first_data_block);
3067
3068                 /*
3069                  * Add the overhead attributed to the superblock and
3070                  * block group descriptors.  If the sparse superblocks
3071                  * feature is turned on, then not all groups have this.
3072                  */
3073                 for (i = 0; i < ngroups; i++) {
3074                         overhead += ext4_bg_has_super(sb, i) +
3075                                 ext4_bg_num_gdb(sb, i);
3076                         cond_resched();
3077                 }
3078
3079                 /*
3080                  * Every block group has an inode bitmap, a block
3081                  * bitmap, and an inode table.
3082                  */
3083                 overhead += ngroups * (2 + sbi->s_itb_per_group);
3084                 sbi->s_overhead_last = overhead;
3085                 smp_wmb();
3086                 sbi->s_blocks_last = ext4_blocks_count(es);
3087         }
3088
3089         buf->f_type = EXT4_SUPER_MAGIC;
3090         buf->f_bsize = sb->s_blocksize;
3091         buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3092         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
3093         ext4_free_blocks_count_set(es, buf->f_bfree);
3094         buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3095         if (buf->f_bfree < ext4_r_blocks_count(es))
3096                 buf->f_bavail = 0;
3097         buf->f_files = le32_to_cpu(es->s_inodes_count);
3098         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3099         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3100         buf->f_namelen = EXT4_NAME_LEN;
3101         fsid = le64_to_cpup((void *)es->s_uuid) ^
3102                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3103         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3104         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3105         return 0;
3106 }
3107
3108 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3109  * is locked for write. Otherwise the are possible deadlocks:
3110  * Process 1                         Process 2
3111  * ext4_create()                     quota_sync()
3112  *   jbd2_journal_start()                   write_dquot()
3113  *   DQUOT_INIT()                        down(dqio_mutex)
3114  *     down(dqio_mutex)                    jbd2_journal_start()
3115  *
3116  */
3117
3118 #ifdef CONFIG_QUOTA
3119
3120 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3121 {
3122         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3123 }
3124
3125 static int ext4_dquot_initialize(struct inode *inode, int type)
3126 {
3127         handle_t *handle;
3128         int ret, err;
3129
3130         /* We may create quota structure so we need to reserve enough blocks */
3131         handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3132         if (IS_ERR(handle))
3133                 return PTR_ERR(handle);
3134         ret = dquot_initialize(inode, type);
3135         err = ext4_journal_stop(handle);
3136         if (!ret)
3137                 ret = err;
3138         return ret;
3139 }
3140
3141 static int ext4_dquot_drop(struct inode *inode)
3142 {
3143         handle_t *handle;
3144         int ret, err;
3145
3146         /* We may delete quota structure so we need to reserve enough blocks */
3147         handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3148         if (IS_ERR(handle)) {
3149                 /*
3150                  * We call dquot_drop() anyway to at least release references
3151                  * to quota structures so that umount does not hang.
3152                  */
3153                 dquot_drop(inode);
3154                 return PTR_ERR(handle);
3155         }
3156         ret = dquot_drop(inode);
3157         err = ext4_journal_stop(handle);
3158         if (!ret)
3159                 ret = err;
3160         return ret;
3161 }
3162
3163 static int ext4_write_dquot(struct dquot *dquot)
3164 {
3165         int ret, err;
3166         handle_t *handle;
3167         struct inode *inode;
3168
3169         inode = dquot_to_inode(dquot);
3170         handle = ext4_journal_start(inode,
3171                                         EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3172         if (IS_ERR(handle))
3173                 return PTR_ERR(handle);
3174         ret = dquot_commit(dquot);
3175         err = ext4_journal_stop(handle);
3176         if (!ret)
3177                 ret = err;
3178         return ret;
3179 }
3180
3181 static int ext4_acquire_dquot(struct dquot *dquot)
3182 {
3183         int ret, err;
3184         handle_t *handle;
3185
3186         handle = ext4_journal_start(dquot_to_inode(dquot),
3187                                         EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3188         if (IS_ERR(handle))
3189                 return PTR_ERR(handle);
3190         ret = dquot_acquire(dquot);
3191         err = ext4_journal_stop(handle);
3192         if (!ret)
3193                 ret = err;
3194         return ret;
3195 }
3196
3197 static int ext4_release_dquot(struct dquot *dquot)
3198 {
3199         int ret, err;
3200         handle_t *handle;
3201
3202         handle = ext4_journal_start(dquot_to_inode(dquot),
3203                                         EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3204         if (IS_ERR(handle)) {
3205                 /* Release dquot anyway to avoid endless cycle in dqput() */
3206                 dquot_release(dquot);
3207                 return PTR_ERR(handle);
3208         }
3209         ret = dquot_release(dquot);
3210         err = ext4_journal_stop(handle);
3211         if (!ret)
3212                 ret = err;
3213         return ret;
3214 }
3215
3216 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3217 {
3218         /* Are we journaling quotas? */
3219         if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3220             EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3221                 dquot_mark_dquot_dirty(dquot);
3222                 return ext4_write_dquot(dquot);
3223         } else {
3224                 return dquot_mark_dquot_dirty(dquot);
3225         }
3226 }
3227
3228 static int ext4_write_info(struct super_block *sb, int type)
3229 {
3230         int ret, err;
3231         handle_t *handle;
3232
3233         /* Data block + inode block */
3234         handle = ext4_journal_start(sb->s_root->d_inode, 2);
3235         if (IS_ERR(handle))
3236                 return PTR_ERR(handle);
3237         ret = dquot_commit_info(sb, type);
3238         err = ext4_journal_stop(handle);
3239         if (!ret)
3240                 ret = err;
3241         return ret;
3242 }
3243
3244 /*
3245  * Turn on quotas during mount time - we need to find
3246  * the quota file and such...
3247  */
3248 static int ext4_quota_on_mount(struct super_block *sb, int type)
3249 {
3250         return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3251                         EXT4_SB(sb)->s_jquota_fmt, type);
3252 }
3253
3254 /*
3255  * Standard function to be called on quota_on
3256  */
3257 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3258                          char *path, int remount)
3259 {
3260         int err;
3261         struct nameidata nd;
3262
3263         if (!test_opt(sb, QUOTA))
3264                 return -EINVAL;
3265         /* When remounting, no checks are needed and in fact, path is NULL */
3266         if (remount)
3267                 return vfs_quota_on(sb, type, format_id, path, remount);
3268
3269         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3270         if (err)
3271                 return err;
3272
3273         /* Quotafile not on the same filesystem? */
3274         if (nd.path.mnt->mnt_sb != sb) {
3275                 path_put(&nd.path);
3276                 return -EXDEV;
3277         }
3278         /* Journaling quota? */
3279         if (EXT4_SB(sb)->s_qf_names[type]) {
3280                 /* Quotafile not of fs root? */
3281                 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3282                         printk(KERN_WARNING
3283                                 "EXT4-fs: Quota file not on filesystem root. "
3284                                 "Journaled quota will not work.\n");
3285         }
3286
3287         /*
3288          * When we journal data on quota file, we have to flush journal to see
3289          * all updates to the file when we bypass pagecache...
3290          */
3291         if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3292                 /*
3293                  * We don't need to lock updates but journal_flush() could
3294                  * otherwise be livelocked...
3295                  */
3296                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3297                 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3298                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3299         }
3300
3301         path_put(&nd.path);
3302         return vfs_quota_on(sb, type, format_id, path, remount);
3303 }
3304
3305 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3306  * acquiring the locks... As quota files are never truncated and quota code
3307  * itself serializes the operations (and noone else should touch the files)
3308  * we don't have to be afraid of races */
3309 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3310                                size_t len, loff_t off)
3311 {
3312         struct inode *inode = sb_dqopt(sb)->files[type];
3313         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3314         int err = 0;
3315         int offset = off & (sb->s_blocksize - 1);
3316         int tocopy;
3317         size_t toread;
3318         struct buffer_head *bh;
3319         loff_t i_size = i_size_read(inode);
3320
3321         if (off > i_size)
3322                 return 0;
3323         if (off+len > i_size)
3324                 len = i_size-off;
3325         toread = len;
3326         while (toread > 0) {
3327                 tocopy = sb->s_blocksize - offset < toread ?
3328                                 sb->s_blocksize - offset : toread;
3329                 bh = ext4_bread(NULL, inode, blk, 0, &err);
3330                 if (err)
3331                         return err;
3332                 if (!bh)        /* A hole? */
3333                         memset(data, 0, tocopy);
3334                 else
3335                         memcpy(data, bh->b_data+offset, tocopy);
3336                 brelse(bh);
3337                 offset = 0;
3338                 toread -= tocopy;
3339                 data += tocopy;
3340                 blk++;
3341         }
3342         return len;
3343 }
3344
3345 /* Write to quotafile (we know the transaction is already started and has
3346  * enough credits) */
3347 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3348                                 const char *data, size_t len, loff_t off)
3349 {
3350         struct inode *inode = sb_dqopt(sb)->files[type];
3351         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3352         int err = 0;
3353         int offset = off & (sb->s_blocksize - 1);
3354         int tocopy;
3355         int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3356         size_t towrite = len;
3357         struct buffer_head *bh;
3358         handle_t *handle = journal_current_handle();
3359
3360         if (!handle) {
3361                 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3362                         " cancelled because transaction is not started.\n",
3363                         (unsigned long long)off, (unsigned long long)len);
3364                 return -EIO;
3365         }
3366         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3367         while (towrite > 0) {
3368                 tocopy = sb->s_blocksize - offset < towrite ?
3369                                 sb->s_blocksize - offset : towrite;
3370                 bh = ext4_bread(handle, inode, blk, 1, &err);
3371                 if (!bh)
3372                         goto out;
3373                 if (journal_quota) {
3374                         err = ext4_journal_get_write_access(handle, bh);
3375                         if (err) {
3376                                 brelse(bh);
3377                                 goto out;
3378                         }
3379                 }
3380                 lock_buffer(bh);
3381                 memcpy(bh->b_data+offset, data, tocopy);
3382                 flush_dcache_page(bh->b_page);
3383                 unlock_buffer(bh);
3384                 if (journal_quota)
3385                         err = ext4_journal_dirty_metadata(handle, bh);
3386                 else {
3387                         /* Always do at least ordered writes for quotas */
3388                         err = ext4_jbd2_file_inode(handle, inode);
3389                         mark_buffer_dirty(bh);
3390                 }
3391                 brelse(bh);
3392                 if (err)
3393                         goto out;
3394                 offset = 0;
3395                 towrite -= tocopy;
3396                 data += tocopy;
3397                 blk++;
3398         }
3399 out:
3400         if (len == towrite) {
3401                 mutex_unlock(&inode->i_mutex);
3402                 return err;
3403         }
3404         if (inode->i_size < off+len-towrite) {
3405                 i_size_write(inode, off+len-towrite);
3406                 EXT4_I(inode)->i_disksize = inode->i_size;
3407         }
3408         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3409         ext4_mark_inode_dirty(handle, inode);
3410         mutex_unlock(&inode->i_mutex);
3411         return len - towrite;
3412 }
3413
3414 #endif
3415
3416 static int ext4_get_sb(struct file_system_type *fs_type,
3417         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3418 {
3419         return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3420 }
3421
3422 static struct file_system_type ext4dev_fs_type = {
3423         .owner          = THIS_MODULE,
3424         .name           = "ext4dev",
3425         .get_sb         = ext4_get_sb,
3426         .kill_sb        = kill_block_super,
3427         .fs_flags       = FS_REQUIRES_DEV,
3428 };
3429
3430 static int __init init_ext4_fs(void)
3431 {
3432         int err;
3433
3434         err = init_ext4_mballoc();
3435         if (err)
3436                 return err;
3437
3438         err = init_ext4_xattr();
3439         if (err)
3440                 goto out2;
3441         err = init_inodecache();
3442         if (err)
3443                 goto out1;
3444         err = register_filesystem(&ext4dev_fs_type);
3445         if (err)
3446                 goto out;
3447         return 0;
3448 out:
3449         destroy_inodecache();
3450 out1:
3451         exit_ext4_xattr();
3452 out2:
3453         exit_ext4_mballoc();
3454         return err;
3455 }
3456
3457 static void __exit exit_ext4_fs(void)
3458 {
3459         unregister_filesystem(&ext4dev_fs_type);
3460         destroy_inodecache();
3461         exit_ext4_xattr();
3462         exit_ext4_mballoc();
3463 }
3464
3465 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3466 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3467 MODULE_LICENSE("GPL");
3468 module_init(init_ext4_fs)
3469 module_exit(exit_ext4_fs)