/* * linux/fs/ext3/super.c * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/fs/minix/inode.c * * Copyright (C) 1991, 1992 Linus Torvalds * * Big-endian to little-endian byte-swapping/bitmaps by * David S. Miller (davem@caip.rutgers.edu), 1995 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_JBD_DEBUG static int ext3_ro_after; /* Make fs read-only after this many jiffies */ #endif static int ext3_load_journal(struct super_block *, struct ext3_super_block *); static int ext3_create_journal(struct super_block *, struct ext3_super_block *, int); static void ext3_commit_super (struct super_block * sb, struct ext3_super_block * es, int sync); static void ext3_mark_recovery_complete(struct super_block * sb, struct ext3_super_block * es); static void ext3_clear_journal_err(struct super_block * sb, struct ext3_super_block * es); #ifdef CONFIG_JBD_DEBUG int journal_no_write[2]; /* * Debug code for turning filesystems "read-only" after a specified * amount of time. This is for crash/recovery testing. */ static void make_rdonly(kdev_t dev, int *no_write) { if (dev) { printk(KERN_WARNING "Turning device %s read-only\n", bdevname(dev)); *no_write = 0xdead0000 + dev; } } static void turn_fs_readonly(unsigned long arg) { struct super_block *sb = (struct super_block *)arg; make_rdonly(sb->s_dev, &journal_no_write[0]); make_rdonly(EXT3_SB(sb)->s_journal->j_dev, &journal_no_write[1]); wake_up(&EXT3_SB(sb)->ro_wait_queue); } static void setup_ro_after(struct super_block *sb) { struct ext3_sb_info *sbi = EXT3_SB(sb); init_timer(&sbi->turn_ro_timer); if (ext3_ro_after) { printk(KERN_DEBUG "fs will go read-only in %d jiffies\n", ext3_ro_after); init_waitqueue_head(&sbi->ro_wait_queue); journal_no_write[0] = 0; journal_no_write[1] = 0; sbi->turn_ro_timer.function = turn_fs_readonly; sbi->turn_ro_timer.data = (unsigned long)sb; sbi->turn_ro_timer.expires = jiffies + ext3_ro_after; ext3_ro_after = 0; add_timer(&sbi->turn_ro_timer); } } static void clear_ro_after(struct super_block *sb) { del_timer_sync(&EXT3_SB(sb)->turn_ro_timer); journal_no_write[0] = 0; journal_no_write[1] = 0; ext3_ro_after = 0; } #else #define setup_ro_after(sb) do {} while (0) #define clear_ro_after(sb) do {} while (0) #endif static char error_buf[1024]; /* Determine the appropriate response to ext3_error on a given filesystem */ static int ext3_error_behaviour(struct super_block *sb) { /* First check for mount-time options */ if (test_opt (sb, ERRORS_PANIC)) return EXT3_ERRORS_PANIC; if (test_opt (sb, ERRORS_RO)) return EXT3_ERRORS_RO; if (test_opt (sb, ERRORS_CONT)) return EXT3_ERRORS_CONTINUE; /* If no overrides were specified on the mount, then fall back * to the default behaviour set in the filesystem's superblock * on disk. */ switch (le16_to_cpu(sb->u.ext3_sb.s_es->s_errors)) { case EXT3_ERRORS_PANIC: return EXT3_ERRORS_PANIC; case EXT3_ERRORS_RO: return EXT3_ERRORS_RO; default: break; } return EXT3_ERRORS_CONTINUE; } /* Deal with the reporting of failure conditions on a filesystem such as * inconsistencies detected or read IO failures. * * On ext2, we can store the error state of the filesystem in the * superblock. That is not possible on ext3, because we may have other * write ordering constraints on the superblock which prevent us from * writing it out straight away; and given that the journal is about to * be aborted, we can't rely on the current, or future, transactions to * write out the superblock safely. * * We'll just use the journal_abort() error code to record an error in * the journal instead. On recovery, the journal will compain about * that error until we've noted it down and cleared it. */ static void ext3_handle_error(struct super_block *sb) { struct ext3_super_block *es = EXT3_SB(sb)->s_es; EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; es->s_state |= cpu_to_le32(EXT3_ERROR_FS); if (sb->s_flags & MS_RDONLY) return; if (ext3_error_behaviour(sb) != EXT3_ERRORS_CONTINUE) { EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; journal_abort(EXT3_SB(sb)->s_journal, -EIO); } if (ext3_error_behaviour(sb) == EXT3_ERRORS_PANIC) panic ("EXT3-fs (device %s): panic forced after error\n", bdevname(sb->s_dev)); if (ext3_error_behaviour(sb) == EXT3_ERRORS_RO) { printk (KERN_CRIT "Remounting filesystem read-only\n"); sb->s_flags |= MS_RDONLY; } ext3_commit_super(sb, es, 1); } void ext3_error (struct super_block * sb, const char * function, const char * fmt, ...) { va_list args; va_start (args, fmt); vsprintf (error_buf, fmt, args); va_end (args); printk (KERN_CRIT "EXT3-fs error (device %s): %s: %s\n", bdevname(sb->s_dev), function, error_buf); ext3_handle_error(sb); } const char *ext3_decode_error(struct super_block * sb, int errno, char nbuf[16]) { char *errstr = NULL; switch (errno) { case -EIO: errstr = "IO failure"; break; case -ENOMEM: errstr = "Out of memory"; break; case -EROFS: if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) errstr = "Journal has aborted"; else errstr = "Readonly filesystem"; break; default: /* If the caller passed in an extra buffer for unknown * errors, textualise them now. Else we just return * NULL. */ if (nbuf) { /* Check for truncated error codes... */ if (snprintf(nbuf, 16, "error %d", -errno) >= 0) errstr = nbuf; } break; } return errstr; } /* __ext3_std_error decodes expected errors from journaling functions * automatically and invokes the appropriate error response. */ void __ext3_std_error (struct super_block * sb, const char * function, int errno) { char nbuf[16]; const char *errstr = ext3_decode_error(sb, errno, nbuf); printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n", bdevname(sb->s_dev), function, errstr); ext3_handle_error(sb); } /* * ext3_abort is a much stronger failure handler than ext3_error. The * abort function may be used to deal with unrecoverable failures such * as journal IO errors or ENOMEM at a critical moment in log management. * * We unconditionally force the filesystem into an ABORT|READONLY state, * unless the error response on the fs has been set to panic in which * case we take the easy way out and panic immediately. */ void ext3_abort (struct super_block * sb, const char * function, const char * fmt, ...) { va_list args; printk (KERN_CRIT "ext3_abort called.\n"); va_start (args, fmt); vsprintf (error_buf, fmt, args); va_end (args); if (ext3_error_behaviour(sb) == EXT3_ERRORS_PANIC) panic ("EXT3-fs panic (device %s): %s: %s\n", bdevname(sb->s_dev), function, error_buf); printk (KERN_CRIT "EXT3-fs abort (device %s): %s: %s\n", bdevname(sb->s_dev), function, error_buf); if (sb->s_flags & MS_RDONLY) return; printk (KERN_CRIT "Remounting filesystem read-only\n"); sb->u.ext3_sb.s_mount_state |= EXT3_ERROR_FS; sb->s_flags |= MS_RDONLY; sb->u.ext3_sb.s_mount_opt |= EXT3_MOUNT_ABORT; journal_abort(EXT3_SB(sb)->s_journal, -EIO); } /* Deal with the reporting of failure conditions while running, such as * inconsistencies in operation or invalid system states. * * Use ext3_error() for cases of invalid filesystem states, as that will * record an error on disk and force a filesystem check on the next boot. */ NORET_TYPE void ext3_panic (struct super_block * sb, const char * function, const char * fmt, ...) { va_list args; va_start (args, fmt); vsprintf (error_buf, fmt, args); va_end (args); /* this is to prevent panic from syncing this filesystem */ /* AKPM: is this sufficient? */ sb->s_flags |= MS_RDONLY; panic ("EXT3-fs panic (device %s): %s: %s\n", bdevname(sb->s_dev), function, error_buf); } void ext3_warning (struct super_block * sb, const char * function, const char * fmt, ...) { va_list args; va_start (args, fmt); vsprintf (error_buf, fmt, args); va_end (args); printk (KERN_WARNING "EXT3-fs warning (device %s): %s: %s\n", bdevname(sb->s_dev), function, error_buf); } void ext3_update_dynamic_rev(struct super_block *sb) { struct ext3_super_block *es = EXT3_SB(sb)->s_es; if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) return; ext3_warning(sb, __FUNCTION__, "updating to rev %d because of new feature flag, " "running e2fsck is recommended", EXT3_DYNAMIC_REV); es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); /* leave es->s_feature_*compat flags alone */ /* es->s_uuid will be set by e2fsck if empty */ /* * The rest of the superblock fields should be zero, and if not it * means they are likely already in use, so leave them alone. We * can leave it up to e2fsck to clean up any inconsistencies there. */ } /* * Open the external journal device */ static struct block_device *ext3_blkdev_get(kdev_t dev) { struct block_device *bdev; int err = -ENODEV; bdev = bdget(kdev_t_to_nr(dev)); if (bdev == NULL) goto fail; err = blkdev_get(bdev, FMODE_READ|FMODE_WRITE, 0, BDEV_FS); if (err < 0) goto fail; return bdev; fail: printk(KERN_ERR "EXT3: failed to open journal device %s: %d\n", bdevname(dev), err); return NULL; } /* * Release the journal device */ static int ext3_blkdev_put(struct block_device *bdev) { return blkdev_put(bdev, BDEV_FS); } static int ext3_blkdev_remove(struct ext3_sb_info *sbi) { struct block_device *bdev; int ret = -ENODEV; bdev = sbi->journal_bdev; if (bdev) { ret = ext3_blkdev_put(bdev); sbi->journal_bdev = 0; } return ret; } #define orphan_list_entry(l) list_entry((l), struct inode, u.ext3_i.i_orphan) static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) { struct list_head *l; printk(KERN_ERR "sb orphan head is %d\n", le32_to_cpu(sbi->s_es->s_last_orphan)); printk(KERN_ERR "sb_info orphan list:\n"); list_for_each(l, &sbi->s_orphan) { struct inode *inode = orphan_list_entry(l); printk(KERN_ERR " " "inode 0x%04x:%ld at %p: mode %o, nlink %d, next %d\n", inode->i_dev, inode->i_ino, inode, inode->i_mode, inode->i_nlink, le32_to_cpu(NEXT_ORPHAN(inode))); } } void ext3_put_super (struct super_block * sb) { struct ext3_sb_info *sbi = EXT3_SB(sb); struct ext3_super_block *es = sbi->s_es; kdev_t j_dev = sbi->s_journal->j_dev; int i; journal_destroy(sbi->s_journal); if (!(sb->s_flags & MS_RDONLY)) { EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); es->s_state = le16_to_cpu(sbi->s_mount_state); BUFFER_TRACE(sbi->s_sbh, "marking dirty"); mark_buffer_dirty(sbi->s_sbh); ext3_commit_super(sb, es, 1); } for (i = 0; i < sbi->s_gdb_count; i++) brelse(sbi->s_group_desc[i]); kfree(sbi->s_group_desc); for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++) brelse(sbi->s_inode_bitmap[i]); for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++) brelse(sbi->s_block_bitmap[i]); brelse(sbi->s_sbh); /* Debugging code just in case the in-memory inode orphan list * isn't empty. The on-disk one can be non-empty if we've * detected an error and taken the fs readonly, but the * in-memory list had better be clean by this point. */ if (!list_empty(&sbi->s_orphan)) dump_orphan_list(sb, sbi); J_ASSERT(list_empty(&sbi->s_orphan)); invalidate_buffers(sb->s_dev); if (j_dev != sb->s_dev) { /* * Invalidate the journal device's buffers. We don't want them * floating about in memory - the physical journal device may * hotswapped, and it breaks the `ro-after' testing code. */ fsync_no_super(j_dev); invalidate_buffers(j_dev); ext3_blkdev_remove(sbi); } clear_ro_after(sb); return; } static struct super_operations ext3_sops = { read_inode: ext3_read_inode, /* BKL held */ write_inode: ext3_write_inode, /* BKL not held. Don't need */ dirty_inode: ext3_dirty_inode, /* BKL not held. We take it */ put_inode: ext3_put_inode, /* BKL not held. Don't need */ delete_inode: ext3_delete_inode, /* BKL not held. We take it */ put_super: ext3_put_super, /* BKL held */ write_super: ext3_write_super, /* BKL held */ write_super_lockfs: ext3_write_super_lockfs, /* BKL not held. Take it */ unlockfs: ext3_unlockfs, /* BKL not held. We take it */ statfs: ext3_statfs, /* BKL held */ remount_fs: ext3_remount, /* BKL held */ }; static int want_value(char *value, char *option) { if (!value || !*value) { printk(KERN_NOTICE "EXT3-fs: the %s option needs an argument\n", option); return -1; } return 0; } static int want_null_value(char *value, char *option) { if (*value) { printk(KERN_NOTICE "EXT3-fs: Invalid %s argument: %s\n", option, value); return -1; } return 0; } static int want_numeric(char *value, char *option, unsigned long *number) { if (want_value(value, option)) return -1; *number = simple_strtoul(value, &value, 0); if (want_null_value(value, option)) return -1; return 0; } /* * This function has been shamelessly adapted from the msdos fs */ static int parse_options (char * options, unsigned long * sb_block, struct ext3_sb_info *sbi, unsigned long * inum, int is_remount) { unsigned long *mount_options = &sbi->s_mount_opt; uid_t *resuid = &sbi->s_resuid; gid_t *resgid = &sbi->s_resgid; char * this_char; char * value; if (!options) return 1; for (this_char = strtok (options, ","); this_char != NULL; this_char = strtok (NULL, ",")) { if ((value = strchr (this_char, '=')) != NULL) *value++ = 0; if (!strcmp (this_char, "bsddf")) clear_opt (*mount_options, MINIX_DF); else if (!strcmp (this_char, "nouid32")) { set_opt (*mount_options, NO_UID32); } else if (!strcmp (this_char, "abort")) set_opt (*mount_options, ABORT); else if (!strcmp (this_char, "check")) { if (!value || !*value || !strcmp (value, "none")) clear_opt (*mount_options, CHECK); else #ifdef CONFIG_EXT3_CHECK set_opt (*mount_options, CHECK); #else printk(KERN_ERR "EXT3 Check option not supported\n"); #endif } else if (!strcmp (this_char, "debug")) set_opt (*mount_options, DEBUG); else if (!strcmp (this_char, "errors")) { if (want_value(value, "errors")) return 0; if (!strcmp (value, "continue")) { clear_opt (*mount_options, ERRORS_RO); clear_opt (*mount_options, ERRORS_PANIC); set_opt (*mount_options, ERRORS_CONT); } else if (!strcmp (value, "remount-ro")) { clear_opt (*mount_options, ERRORS_CONT); clear_opt (*mount_options, ERRORS_PANIC); set_opt (*mount_options, ERRORS_RO); } else if (!strcmp (value, "panic")) { clear_opt (*mount_options, ERRORS_CONT); clear_opt (*mount_options, ERRORS_RO); set_opt (*mount_options, ERRORS_PANIC); } else { printk (KERN_ERR "EXT3-fs: Invalid errors option: %s\n", value); return 0; } } else if (!strcmp (this_char, "grpid") || !strcmp (this_char, "bsdgroups")) set_opt (*mount_options, GRPID); else if (!strcmp (this_char, "minixdf")) set_opt (*mount_options, MINIX_DF); else if (!strcmp (this_char, "nocheck")) clear_opt (*mount_options, CHECK); else if (!strcmp (this_char, "nogrpid") || !strcmp (this_char, "sysvgroups")) clear_opt (*mount_options, GRPID); else if (!strcmp (this_char, "resgid")) { unsigned long v; if (want_numeric(value, "resgid", &v)) return 0; *resgid = v; } else if (!strcmp (this_char, "resuid")) { unsigned long v; if (want_numeric(value, "resuid", &v)) return 0; *resuid = v; } else if (!strcmp (this_char, "sb")) { if (want_numeric(value, "sb", sb_block)) return 0; } #ifdef CONFIG_JBD_DEBUG else if (!strcmp (this_char, "ro-after")) { unsigned long v; if (want_numeric(value, "ro-after", &v)) return 0; ext3_ro_after = v; } #endif /* Silently ignore the quota options */ else if (!strcmp (this_char, "grpquota") || !strcmp (this_char, "noquota") || !strcmp (this_char, "quota") || !strcmp (this_char, "usrquota")) /* Don't do anything ;-) */ ; else if (!strcmp (this_char, "journal")) { /* @@@ FIXME */ /* Eventually we will want to be able to create a journal file here. For now, only allow the user to specify an existing inode to be the journal file. */ if (is_remount) { printk(KERN_ERR "EXT3-fs: cannot specify " "journal on remount\n"); return 0; } if (want_value(value, "journal")) return 0; if (!strcmp (value, "update")) set_opt (*mount_options, UPDATE_JOURNAL); else if (want_numeric(value, "journal", inum)) return 0; } else if (!strcmp (this_char, "noload")) set_opt (*mount_options, NOLOAD); else if (!strcmp (this_char, "data")) { int data_opt = 0; if (want_value(value, "data")) return 0; if (!strcmp (value, "journal")) data_opt = EXT3_MOUNT_JOURNAL_DATA; else if (!strcmp (value, "ordered")) data_opt = EXT3_MOUNT_ORDERED_DATA; else if (!strcmp (value, "writeback")) data_opt = EXT3_MOUNT_WRITEBACK_DATA; else { printk (KERN_ERR "EXT3-fs: Invalid data option: %s\n", value); return 0; } if (is_remount) { if ((*mount_options & EXT3_MOUNT_DATA_FLAGS) != data_opt) { printk(KERN_ERR "EXT3-fs: cannot change data " "mode on remount\n"); return 0; } } else { *mount_options &= ~EXT3_MOUNT_DATA_FLAGS; *mount_options |= data_opt; } } else { printk (KERN_ERR "EXT3-fs: Unrecognized mount option %s\n", this_char); return 0; } } return 1; } static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, int read_only) { struct ext3_sb_info *sbi = EXT3_SB(sb); int res = 0; if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { printk (KERN_ERR "EXT3-fs warning: revision level too high, " "forcing read-only mode\n"); res = MS_RDONLY; } if (read_only) return res; if (!(sbi->s_mount_state & EXT3_VALID_FS)) printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, " "running e2fsck is recommended\n"); else if ((sbi->s_mount_state & EXT3_ERROR_FS)) printk (KERN_WARNING "EXT3-fs warning: mounting fs with errors, " "running e2fsck is recommended\n"); else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && le16_to_cpu(es->s_mnt_count) >= (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) printk (KERN_WARNING "EXT3-fs warning: maximal mount count reached, " "running e2fsck is recommended\n"); else if (le32_to_cpu(es->s_checkinterval) && (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= CURRENT_TIME)) printk (KERN_WARNING "EXT3-fs warning: checktime reached, " "running e2fsck is recommended\n"); #if 0 /* @@@ We _will_ want to clear the valid bit if we find inconsistencies, to force a fsck at reboot. But for a plain journaled filesystem we can keep it set as valid forever! :) */ es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS); #endif if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) es->s_max_mnt_count = (__s16) cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); es->s_mtime = cpu_to_le32(CURRENT_TIME); ext3_update_dynamic_rev(sb); EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); ext3_commit_super (sb, es, 1); if (test_opt (sb, DEBUG)) printk (KERN_INFO "[EXT3 FS %s, %s, bs=%lu, gc=%lu, " "bpg=%lu, ipg=%lu, mo=%04lx]\n", EXT3FS_VERSION, EXT3FS_DATE, sb->s_blocksize, sbi->s_groups_count, EXT3_BLOCKS_PER_GROUP(sb), EXT3_INODES_PER_GROUP(sb), sbi->s_mount_opt); printk(KERN_INFO "EXT3 FS " EXT3FS_VERSION ", " EXT3FS_DATE " on %s, ", bdevname(sb->s_dev)); if (EXT3_SB(sb)->s_journal->j_inode == NULL) { printk("external journal on %s\n", bdevname(EXT3_SB(sb)->s_journal->j_dev)); } else { printk("internal journal\n"); } #ifdef CONFIG_EXT3_CHECK if (test_opt (sb, CHECK)) { ext3_check_blocks_bitmap (sb); ext3_check_inodes_bitmap (sb); } #endif setup_ro_after(sb); return res; } static int ext3_check_descriptors (struct super_block * sb) { struct ext3_sb_info *sbi = EXT3_SB(sb); unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); struct ext3_group_desc * gdp = NULL; int desc_block = 0; int i; ext3_debug ("Checking group descriptors"); for (i = 0; i < sbi->s_groups_count; i++) { if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0) gdp = (struct ext3_group_desc *) sbi->s_group_desc[desc_block++]->b_data; if (le32_to_cpu(gdp->bg_block_bitmap) < block || le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT3_BLOCKS_PER_GROUP(sb)) { ext3_error (sb, "ext3_check_descriptors", "Block bitmap for group %d" " not in group (block %lu)!", i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); return 0; } if (le32_to_cpu(gdp->bg_inode_bitmap) < block || le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT3_BLOCKS_PER_GROUP(sb)) { ext3_error (sb, "ext3_check_descriptors", "Inode bitmap for group %d" " not in group (block %lu)!", i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); return 0; } if (le32_to_cpu(gdp->bg_inode_table) < block || le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= block + EXT3_BLOCKS_PER_GROUP(sb)) { ext3_error (sb, "ext3_check_descriptors", "Inode table for group %d" " not in group (block %lu)!", i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); return 0; } block += EXT3_BLOCKS_PER_GROUP(sb); gdp++; } return 1; } /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at * the superblock) which were deleted from all directories, but held open by * a process at the time of a crash. We walk the list and try to delete these * inodes at recovery time (only with a read-write filesystem). * * In order to keep the orphan inode chain consistent during traversal (in * case of crash during recovery), we link each inode into the superblock * orphan list_head and handle it the same way as an inode deletion during * normal operation (which journals the operations for us). * * We only do an iget() and an iput() on each inode, which is very safe if we * accidentally point at an in-use or already deleted inode. The worst that * can happen in this case is that we get a "bit already cleared" message from * ext3_free_inode(). The only reason we would point at a wrong inode is if * e2fsck was run on this filesystem, and it must have already done the orphan * inode cleanup for us, so we can safely abort without any further action. */ static void ext3_orphan_cleanup (struct super_block * sb, struct ext3_super_block * es) { unsigned int s_flags = sb->s_flags; int nr_orphans = 0, nr_truncates = 0; if (!es->s_last_orphan) { jbd_debug(4, "no orphan inodes to clean up\n"); return; } if (s_flags & MS_RDONLY) { printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n", bdevname(sb->s_dev)); sb->s_flags &= ~MS_RDONLY; } if (sb->u.ext3_sb.s_mount_state & EXT3_ERROR_FS) { if (es->s_last_orphan) jbd_debug(1, "Errors on filesystem, " "clearing orphan list.\n"); es->s_last_orphan = 0; jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); return; } while (es->s_last_orphan) { struct inode *inode; if (!(inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { es->s_last_orphan = 0; break; } list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); if (inode->i_nlink) { printk(KERN_DEBUG __FUNCTION__ ": truncating inode %ld to %Ld bytes\n", inode->i_ino, inode->i_size); jbd_debug(2, "truncating inode %ld to %Ld bytes\n", inode->i_ino, inode->i_size); ext3_truncate(inode); nr_truncates++; } else { printk(KERN_DEBUG __FUNCTION__ ": deleting unreferenced inode %ld\n", inode->i_ino); jbd_debug(2, "deleting unreferenced inode %ld\n", inode->i_ino); nr_orphans++; } iput(inode); /* The delete magic happens here! */ } #define PLURAL(x) (x), ((x)==1) ? "" : "s" if (nr_orphans) printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n", bdevname(sb->s_dev), PLURAL(nr_orphans)); if (nr_truncates) printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n", bdevname(sb->s_dev), PLURAL(nr_truncates)); sb->s_flags = s_flags; /* Restore MS_RDONLY status */ } #define log2(n) ffz(~(n)) /* * Maximal file size. There is a direct, and {,double-,triple-}indirect * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. * We need to be 1 filesystem block less than the 2^32 sector limit. */ static loff_t ext3_max_size(int bits) { loff_t res = EXT3_NDIR_BLOCKS; res += 1LL << (bits-2); res += 1LL << (2*(bits-2)); res += 1LL << (3*(bits-2)); res <<= bits; if (res > (512LL << 32) - (1 << bits)) res = (512LL << 32) - (1 << bits); return res; } struct super_block * ext3_read_super (struct super_block * sb, void * data, int silent) { struct buffer_head * bh; struct ext3_super_block *es = 0; struct ext3_sb_info *sbi = EXT3_SB(sb); unsigned long sb_block = 1; unsigned long logic_sb_block = 1; unsigned long offset = 0; unsigned long journal_inum = 0; kdev_t dev = sb->s_dev; int blocksize; int hblock; int db_count; int i; int needs_recovery; #ifdef CONFIG_JBD_DEBUG ext3_ro_after = 0; #endif /* * See what the current blocksize for the device is, and * use that as the blocksize. Otherwise (or if the blocksize * is smaller than the default) use the default. * This is important for devices that have a hardware * sectorsize that is larger than the default. */ blocksize = EXT3_MIN_BLOCK_SIZE; hblock = get_hardsect_size(dev); if (blocksize < hblock) blocksize = hblock; sbi->s_mount_opt = 0; sbi->s_resuid = EXT3_DEF_RESUID; sbi->s_resgid = EXT3_DEF_RESGID; if (!parse_options ((char *) data, &sb_block, sbi, &journal_inum, 0)) { sb->s_dev = 0; goto out_fail; } set_blocksize (dev, blocksize); /* * The ext3 superblock will not be buffer aligned for other than 1kB * block sizes. We need to calculate the offset from buffer start. */ if (blocksize != EXT3_MIN_BLOCK_SIZE) { logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; } if (!(bh = bread (dev, logic_sb_block, blocksize))) { printk (KERN_ERR "EXT3-fs: unable to read superblock\n"); goto out_fail; } /* * Note: s_es must be initialized as soon as possible because * some ext3 macro-instructions depend on its value */ es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); sbi->s_es = es; sb->s_magic = le16_to_cpu(es->s_magic); if (sb->s_magic != EXT3_SUPER_MAGIC) { if (!silent) printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n", bdevname(dev)); goto failed_mount; } if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) printk(KERN_WARNING "EXT3-fs warning: feature flags set on rev 0 fs, " "running e2fsck is recommended\n"); /* * Check feature flags regardless of the revision level, since we * previously didn't change the revision level when setting the flags, * so there is a chance incompat flags are set on a rev 0 filesystem. */ if ((i = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))) { printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of " "unsupported optional features (%x).\n", bdevname(dev), i); goto failed_mount; } if (!(sb->s_flags & MS_RDONLY) && (i = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))){ printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of " "unsupported optional features (%x).\n", bdevname(dev), i); goto failed_mount; } sb->s_blocksize_bits = le32_to_cpu(es->s_log_block_size) + 10; sb->s_blocksize = 1 << sb->s_blocksize_bits; if (sb->s_blocksize < EXT3_MIN_BLOCK_SIZE || sb->s_blocksize > EXT3_MAX_BLOCK_SIZE) { printk(KERN_ERR "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n", blocksize, bdevname(dev)); goto failed_mount; } sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); if (sb->s_blocksize != blocksize) { blocksize = sb->s_blocksize; /* * Make sure the blocksize for the filesystem is larger * than the hardware sectorsize for the machine. */ if (sb->s_blocksize < hblock) { printk(KERN_ERR "EXT3-fs: blocksize %d too small for " "device blocksize %d.\n", blocksize, hblock); goto failed_mount; } brelse (bh); set_blocksize (dev, sb->s_blocksize); logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; bh = bread (dev, logic_sb_block, blocksize); if (!bh) { printk(KERN_ERR "EXT3-fs: Can't read superblock on 2nd try.\n"); return NULL; } es = (struct ext3_super_block *)(((char *)bh->b_data) + offset); sbi->s_es = es; if (es->s_magic != le16_to_cpu(EXT3_SUPER_MAGIC)) { printk (KERN_ERR "EXT3-fs: Magic mismatch, very weird !\n"); goto failed_mount; } } if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; } else { sbi->s_inode_size = le16_to_cpu(es->s_inode_size); sbi->s_first_ino = le32_to_cpu(es->s_first_ino); if (sbi->s_inode_size != EXT3_GOOD_OLD_INODE_SIZE) { printk (KERN_ERR "EXT3-fs: unsupported inode size: %d\n", sbi->s_inode_size); goto failed_mount; } } sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << le32_to_cpu(es->s_log_frag_size); if (blocksize != sbi->s_frag_size) { printk(KERN_ERR "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n", sbi->s_frag_size, blocksize); goto failed_mount; } sbi->s_frags_per_block = 1; sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); sbi->s_itb_per_group = sbi->s_inodes_per_group /sbi->s_inodes_per_block; sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); sbi->s_sbh = bh; if (sbi->s_resuid == EXT3_DEF_RESUID) sbi->s_resuid = le16_to_cpu(es->s_def_resuid); if (sbi->s_resgid == EXT3_DEF_RESGID) sbi->s_resgid = le16_to_cpu(es->s_def_resgid); sbi->s_mount_state = le16_to_cpu(es->s_state); sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb)); sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb)); if (sbi->s_blocks_per_group > blocksize * 8) { printk (KERN_ERR "EXT3-fs: #blocks per group too big: %lu\n", sbi->s_blocks_per_group); goto failed_mount; } if (sbi->s_frags_per_group > blocksize * 8) { printk (KERN_ERR "EXT3-fs: #fragments per group too big: %lu\n", sbi->s_frags_per_group); goto failed_mount; } if (sbi->s_inodes_per_group > blocksize * 8) { printk (KERN_ERR "EXT3-fs: #inodes per group too big: %lu\n", sbi->s_inodes_per_group); goto failed_mount; } sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - le32_to_cpu(es->s_first_data_block) + EXT3_BLOCKS_PER_GROUP(sb) - 1) / EXT3_BLOCKS_PER_GROUP(sb); db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) / EXT3_DESC_PER_BLOCK(sb); sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), GFP_KERNEL); if (sbi->s_group_desc == NULL) { printk (KERN_ERR "EXT3-fs: not enough memory\n"); goto failed_mount; } for (i = 0; i < db_count; i++) { sbi->s_group_desc[i] = bread(dev, logic_sb_block + i + 1, blocksize); if (!sbi->s_group_desc[i]) { printk (KERN_ERR "EXT3-fs: " "can't read group descriptor %d\n", i); db_count = i; goto failed_mount2; } } if (!ext3_check_descriptors (sb)) { printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n"); goto failed_mount2; } for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++) { sbi->s_inode_bitmap_number[i] = 0; sbi->s_inode_bitmap[i] = NULL; sbi->s_block_bitmap_number[i] = 0; sbi->s_block_bitmap[i] = NULL; } sbi->s_loaded_inode_bitmaps = 0; sbi->s_loaded_block_bitmaps = 0; sbi->s_gdb_count = db_count; /* * set up enough so that it can read an inode */ sb->s_op = &ext3_sops; INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ sb->s_root = 0; needs_recovery = (es->s_last_orphan != 0 || EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)); /* * The first inode we look at is the journal inode. Don't try * root first: it may be modified in the journal! */ if (!test_opt(sb, NOLOAD) && EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { if (ext3_load_journal(sb, es)) goto failed_mount2; } else if (journal_inum) { if (ext3_create_journal(sb, es, journal_inum)) goto failed_mount2; } else { if (!silent) printk (KERN_ERR "ext3: No journal on filesystem on %s\n", bdevname(dev)); goto failed_mount2; } /* We have now updated the journal if required, so we can * validate the data journaling mode. */ switch (test_opt(sb, DATA_FLAGS)) { case 0: /* No mode set, assume a default based on the journal capabilities: ORDERED_DATA if the journal can cope, else JOURNAL_DATA */ if (journal_check_available_features (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) set_opt(sbi->s_mount_opt, ORDERED_DATA); else set_opt(sbi->s_mount_opt, JOURNAL_DATA); break; case EXT3_MOUNT_ORDERED_DATA: case EXT3_MOUNT_WRITEBACK_DATA: if (!journal_check_available_features (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { printk(KERN_ERR "EXT3-fs: Journal does not support " "requested data journaling mode\n"); goto failed_mount3; } default: break; } /* * The journal_load will have done any necessary log recovery, * so we can safely mount the rest of the filesystem now. */ sb->s_root = d_alloc_root(iget(sb, EXT3_ROOT_INO)); if (!sb->s_root || !S_ISDIR(sb->s_root->d_inode->i_mode) || !sb->s_root->d_inode->i_blocks || !sb->s_root->d_inode->i_size) { if (sb->s_root) { dput(sb->s_root); sb->s_root = NULL; printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n"); } else printk(KERN_ERR "EXT3-fs: get root inode failed\n"); goto failed_mount3; } ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY); /* * akpm: core read_super() calls in here with the superblock locked. * That deadlocks, because orphan cleanup needs to lock the superblock * in numerous places. Here we just pop the lock - it's relatively * harmless, because we are now ready to accept write_super() requests, * and aviro says that's the only reason for hanging onto the * superblock lock. */ EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; unlock_super(sb); /* akpm: sigh */ ext3_orphan_cleanup(sb, es); lock_super(sb); EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; if (needs_recovery) printk (KERN_INFO "EXT3-fs: recovery complete.\n"); ext3_mark_recovery_complete(sb, es); printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n", test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": "writeback"); return sb; failed_mount3: journal_destroy(sbi->s_journal); failed_mount2: for (i = 0; i < db_count; i++) brelse(sbi->s_group_desc[i]); kfree(sbi->s_group_desc); failed_mount: ext3_blkdev_remove(sbi); brelse(bh); out_fail: return NULL; } static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum) { struct inode *journal_inode; journal_t *journal; /* First, test for the existence of a valid inode on disk. Bad * things happen if we iget() an unused inode, as the subsequent * iput() will try to delete it. */ journal_inode = iget(sb, journal_inum); if (!journal_inode) { printk(KERN_ERR "EXT3-fs: no journal found.\n"); return NULL; } if (!journal_inode->i_nlink) { make_bad_inode(journal_inode); iput(journal_inode); printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n"); return NULL; } jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", journal_inode, journal_inode->i_size); if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { printk(KERN_ERR "EXT3-fs: invalid journal inode.\n"); iput(journal_inode); return NULL; } journal = journal_init_inode(journal_inode); if (!journal) { printk(KERN_ERR "EXT3-fs: Could not load journal inode\n"); iput(journal_inode); } return journal; } static journal_t *ext3_get_dev_journal(struct super_block *sb, int dev) { struct buffer_head * bh; journal_t *journal; int start; int len; int hblock, blocksize; unsigned long sb_block; unsigned long offset; kdev_t journal_dev = to_kdev_t(dev); struct ext3_super_block * es; struct block_device *bdev; bdev = ext3_blkdev_get(journal_dev); if (bdev == NULL) return NULL; blocksize = sb->s_blocksize; hblock = get_hardsect_size(journal_dev); if (blocksize < hblock) { printk(KERN_ERR "EXT3-fs: blocksize too small for journal device.\n"); goto out_bdev; } sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; offset = EXT3_MIN_BLOCK_SIZE % blocksize; set_blocksize(dev, blocksize); if (!(bh = bread(dev, sb_block, blocksize))) { printk(KERN_ERR "EXT3-fs: couldn't read superblock of " "external journal\n"); goto out_bdev; } es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || !(le32_to_cpu(es->s_feature_incompat) & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { printk(KERN_ERR "EXT3-fs: external journal has " "bad superblock\n"); brelse(bh); goto out_bdev; } if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { printk(KERN_ERR "EXT3-fs: journal UUID does not match\n"); brelse(bh); goto out_bdev; } len = le32_to_cpu(es->s_blocks_count); start = sb_block + 1; brelse(bh); /* we're done with the superblock */ journal = journal_init_dev(journal_dev, sb->s_dev, start, len, blocksize); if (!journal) { printk(KERN_ERR "EXT3-fs: failed to create device journal\n"); goto out_bdev; } ll_rw_block(READ, 1, &journal->j_sb_buffer); wait_on_buffer(journal->j_sb_buffer); if (!buffer_uptodate(journal->j_sb_buffer)) { printk(KERN_ERR "EXT3-fs: I/O error on journal device\n"); goto out_journal; } if (ntohl(journal->j_superblock->s_nr_users) != 1) { printk(KERN_ERR "EXT3-fs: External journal has more than one " "user (unsupported) - %d\n", ntohl(journal->j_superblock->s_nr_users)); goto out_journal; } EXT3_SB(sb)->journal_bdev = bdev; return journal; out_journal: journal_destroy(journal); out_bdev: ext3_blkdev_put(bdev); return NULL; } static int ext3_load_journal(struct super_block * sb, struct ext3_super_block * es) { journal_t *journal; int journal_inum = le32_to_cpu(es->s_journal_inum); int journal_dev = le32_to_cpu(es->s_journal_dev); int err = 0; int really_read_only; really_read_only = is_read_only(sb->s_dev); /* * Are we loading a blank journal or performing recovery after a * crash? For recovery, we need to check in advance whether we * can get read-write access to the device. */ if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { if (sb->s_flags & MS_RDONLY) { printk(KERN_INFO "EXT3-fs: INFO: recovery " "required on readonly filesystem.\n"); if (really_read_only) { printk(KERN_ERR "EXT3-fs: write access " "unavailable, cannot proceed.\n"); return -EROFS; } printk (KERN_INFO "EXT3-fs: write access will " "be enabled during recovery.\n"); } } if (journal_inum && journal_dev) { printk(KERN_ERR "EXT3-fs: filesystem has both journal " "and inode journals!\n"); return -EINVAL; } if (journal_inum) { if (!(journal = ext3_get_journal(sb, journal_inum))) return -EINVAL; } else { if (!(journal = ext3_get_dev_journal(sb, journal_dev))) return -EINVAL; } if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { err = journal_update_format(journal); if (err) { printk(KERN_ERR "EXT3-fs: error updating journal.\n"); journal_destroy(journal); return err; } } if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) err = journal_wipe(journal, !really_read_only); if (!err) err = journal_load(journal); if (err) { printk(KERN_ERR "EXT3-fs: error loading journal.\n"); journal_destroy(journal); return err; } EXT3_SB(sb)->s_journal = journal; ext3_clear_journal_err(sb, es); return 0; } static int ext3_create_journal(struct super_block * sb, struct ext3_super_block * es, int journal_inum) { journal_t *journal; if (sb->s_flags & MS_RDONLY) { printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to " "create journal.\n"); return -EROFS; } if (!(journal = ext3_get_journal(sb, journal_inum))) return -EINVAL; printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n", journal_inum); if (journal_create(journal)) { printk(KERN_ERR "EXT3-fs: error creating journal.\n"); journal_destroy(journal); return -EIO; } EXT3_SB(sb)->s_journal = journal; ext3_update_dynamic_rev(sb); EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); es->s_journal_inum = cpu_to_le32(journal_inum); sb->s_dirt = 1; /* Make sure we flush the recovery flag to disk. */ ext3_commit_super(sb, es, 1); return 0; } static void ext3_commit_super (struct super_block * sb, struct ext3_super_block * es, int sync) { es->s_wtime = cpu_to_le32(CURRENT_TIME); BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "marking dirty"); mark_buffer_dirty(sb->u.ext3_sb.s_sbh); if (sync) { ll_rw_block(WRITE, 1, &sb->u.ext3_sb.s_sbh); wait_on_buffer(sb->u.ext3_sb.s_sbh); } } /* * Have we just finished recovery? If so, and if we are mounting (or * remounting) the filesystem readonly, then we will end up with a * consistent fs on disk. Record that fact. */ static void ext3_mark_recovery_complete(struct super_block * sb, struct ext3_super_block * es) { journal_flush(EXT3_SB(sb)->s_journal); if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && sb->s_flags & MS_RDONLY) { EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); sb->s_dirt = 0; ext3_commit_super(sb, es, 1); } } /* * If we are mounting (or read-write remounting) a filesystem whose journal * has recorded an error from a previous lifetime, move that error to the * main filesystem now. */ static void ext3_clear_journal_err(struct super_block * sb, struct ext3_super_block * es) { journal_t *journal; int j_errno; const char *errstr; journal = EXT3_SB(sb)->s_journal; /* * Now check for any error status which may have been recorded in the * journal by a prior ext3_error() or ext3_abort() */ j_errno = journal_errno(journal); if (j_errno) { char nbuf[16]; errstr = ext3_decode_error(sb, j_errno, nbuf); ext3_warning(sb, __FUNCTION__, "Filesystem error recorded " "from previous mount: %s", errstr); ext3_warning(sb, __FUNCTION__, "Marking fs in need of " "filesystem check."); sb->u.ext3_sb.s_mount_state |= EXT3_ERROR_FS; es->s_state |= cpu_to_le16(EXT3_ERROR_FS); ext3_commit_super (sb, es, 1); journal_clear_err(journal); } } /* * Force the running and committing transactions to commit, * and wait on the commit. */ int ext3_force_commit(struct super_block *sb) { journal_t *journal; int ret; if (sb->s_flags & MS_RDONLY) return 0; journal = EXT3_SB(sb)->s_journal; sb->s_dirt = 0; lock_kernel(); /* important: lock down j_running_transaction */ ret = ext3_journal_force_commit(journal); unlock_kernel(); return ret; } /* * Ext3 always journals updates to the superblock itself, so we don't * have to propagate any other updates to the superblock on disk at this * point. Just start an async writeback to get the buffers on their way * to the disk. * * This implicitly triggers the writebehind on sync(). */ static int do_sync_supers = 0; MODULE_PARM(do_sync_supers, "i"); MODULE_PARM_DESC(do_sync_supers, "Write superblocks synchronously"); void ext3_write_super (struct super_block * sb) { tid_t target; if (down_trylock(&sb->s_lock) == 0) BUG(); /* aviro detector */ sb->s_dirt = 0; target = log_start_commit(EXT3_SB(sb)->s_journal, NULL); if (do_sync_supers) { unlock_super(sb); log_wait_commit(EXT3_SB(sb)->s_journal, target); lock_super(sb); } } /* * LVM calls this function before a (read-only) snapshot is created. This * gives us a chance to flush the journal completely and mark the fs clean. */ void ext3_write_super_lockfs(struct super_block *sb) { sb->s_dirt = 0; lock_kernel(); /* 2.4.5 forgot to do this for us */ if (!(sb->s_flags & MS_RDONLY)) { journal_t *journal = EXT3_SB(sb)->s_journal; /* Now we set up the journal barrier. */ journal_lock_updates(journal); journal_flush(journal); /* Journal blocked and flushed, clear needs_recovery flag. */ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); } unlock_kernel(); } /* * Called by LVM after the snapshot is done. We need to reset the RECOVER * flag here, even though the filesystem is not technically dirty yet. */ void ext3_unlockfs(struct super_block *sb) { if (!(sb->s_flags & MS_RDONLY)) { lock_kernel(); lock_super(sb); /* Reser the needs_recovery flag before the fs is unlocked. */ EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); unlock_super(sb); journal_unlock_updates(EXT3_SB(sb)->s_journal); unlock_kernel(); } } int ext3_remount (struct super_block * sb, int * flags, char * data) { struct ext3_super_block * es; struct ext3_sb_info *sbi = EXT3_SB(sb); unsigned long tmp; clear_ro_after(sb); /* * Allow the "check" option to be passed as a remount option. */ if (!parse_options(data, &tmp, sbi, &tmp, 1)) return -EINVAL; if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) ext3_abort(sb, __FUNCTION__, "Abort forced by user"); es = sbi->s_es; if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) return -EROFS; if (*flags & MS_RDONLY) { /* * First of all, the unconditional stuff we have to do * to disable replay of the journal when we next remount */ sb->s_flags |= MS_RDONLY; /* * OK, test if we are remounting a valid rw partition * readonly, and if so set the rdonly flag and then * mark the partition as valid again. */ if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && (sbi->s_mount_state & EXT3_VALID_FS)) es->s_state = cpu_to_le16(sbi->s_mount_state); ext3_mark_recovery_complete(sb, es); } else { int ret; if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))) { printk(KERN_WARNING "EXT3-fs: %s: couldn't " "remount RDWR because of unsupported " "optional features (%x).\n", bdevname(sb->s_dev), ret); return -EROFS; } /* * Mounting a RDONLY partition read-write, so reread * and store the current valid flag. (It may have * been changed by e2fsck since we originally mounted * the partition.) */ ext3_clear_journal_err(sb, es); sbi->s_mount_state = le16_to_cpu(es->s_state); if (!ext3_setup_super (sb, es, 0)) sb->s_flags &= ~MS_RDONLY; } } setup_ro_after(sb); return 0; } int ext3_statfs (struct super_block * sb, struct statfs * buf) { struct ext3_super_block *es = EXT3_SB(sb)->s_es; unsigned long overhead; int i; if (test_opt (sb, MINIX_DF)) overhead = 0; else { /* * Compute the overhead (FS structures) */ /* * All of the blocks before first_data_block are * overhead */ overhead = le32_to_cpu(es->s_first_data_block); /* * Add the overhead attributed to the superblock and * block group descriptors. If the sparse superblocks * feature is turned on, then not all groups have this. */ for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) overhead += ext3_bg_has_super(sb, i) + ext3_bg_num_gdb(sb, i); /* * Every block group has an inode bitmap, a block * bitmap, and an inode table. */ overhead += (EXT3_SB(sb)->s_groups_count * (2 + EXT3_SB(sb)->s_itb_per_group)); } buf->f_type = EXT3_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; buf->f_bfree = ext3_count_free_blocks (sb); buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) buf->f_bavail = 0; buf->f_files = le32_to_cpu(es->s_inodes_count); buf->f_ffree = ext3_count_free_inodes (sb); buf->f_namelen = EXT3_NAME_LEN; return 0; } static DECLARE_FSTYPE_DEV(ext3_fs_type, "ext3", ext3_read_super); static int __init init_ext3_fs(void) { return register_filesystem(&ext3_fs_type); } static void __exit exit_ext3_fs(void) { unregister_filesystem(&ext3_fs_type); } EXPORT_NO_SYMBOLS; MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); MODULE_LICENSE("GPL"); module_init(init_ext3_fs) module_exit(exit_ext3_fs)