| /* |
| * 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 <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/fs.h> |
| #include <linux/time.h> |
| #include <linux/jbd.h> |
| #include <linux/ext3_fs.h> |
| #include <linux/ext3_jbd.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/smp_lock.h> |
| #include <linux/buffer_head.h> |
| #include <linux/vfs.h> |
| #include <asm/uaccess.h> |
| #include "xattr.h" |
| #include "acl.h" |
| |
| #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); |
| static int ext3_sync_fs(struct super_block *sb, int wait); |
| |
| #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(struct block_device *bdev, int *no_write) |
| { |
| if (bdev) { |
| printk(KERN_WARNING "Turning device %s read-only\n", |
| bdevname(bdev)); |
| *no_write = 0xdead0000 + bdev->bd_dev; |
| } |
| } |
| |
| static void turn_fs_readonly(unsigned long arg) |
| { |
| struct super_block *sb = (struct super_block *)arg; |
| |
| make_rdonly(sb->s_bdev, &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]; |
| |
| /* 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 (test_opt (sb, ERRORS_PANIC)) |
| panic ("EXT3-fs (device %s): panic forced after error\n", |
| sb->s_id); |
| if (test_opt (sb, ERRORS_RO)) { |
| printk (KERN_CRIT "Remounting filesystem read-only\n"); |
| sb->s_flags |= MS_RDONLY; |
| } else { |
| EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; |
| journal_abort(EXT3_SB(sb)->s_journal, -EIO); |
| } |
| 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", |
| sb->s_id, 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", |
| sb->s_id, 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 (test_opt (sb, ERRORS_PANIC)) |
| panic ("EXT3-fs panic (device %s): %s: %s\n", |
| sb->s_id, function, error_buf); |
| |
| printk (KERN_CRIT "EXT3-fs abort (device %s): %s: %s\n", |
| sb->s_id, function, error_buf); |
| |
| if (sb->s_flags & MS_RDONLY) |
| return; |
| |
| printk (KERN_CRIT "Remounting filesystem read-only\n"); |
| EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; |
| sb->s_flags |= MS_RDONLY; |
| EXT3_SB(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", |
| sb->s_id, 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", |
| sb->s_id, 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(dev_t dev) |
| { |
| struct block_device *bdev; |
| int err = -ENODEV; |
| |
| bdev = bdget(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; |
| } |
| |
| static inline struct inode *orphan_list_entry(struct list_head *l) |
| { |
| return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; |
| } |
| |
| 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 %s:%ld at %p: mode %o, nlink %d, next %d\n", |
| inode->i_sb->s_id, 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; |
| int i; |
| |
| ext3_xattr_put_super(sb); |
| 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); |
| kfree(sbi->s_debts); |
| 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_bdev(sb->s_bdev, 0); |
| if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
| /* |
| * 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. |
| */ |
| sync_blockdev(sbi->journal_bdev); |
| invalidate_bdev(sbi->journal_bdev, 0); |
| ext3_blkdev_remove(sbi); |
| } |
| clear_ro_after(sb); |
| sb->s_fs_info = NULL; |
| kfree(sbi); |
| return; |
| } |
| |
| static kmem_cache_t *ext3_inode_cachep; |
| |
| /* |
| * Called inside transaction, so use GFP_NOFS |
| */ |
| static struct inode *ext3_alloc_inode(struct super_block *sb) |
| { |
| struct ext3_inode_info *ei; |
| |
| ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS); |
| if (!ei) |
| return NULL; |
| #ifdef CONFIG_EXT3_FS_POSIX_ACL |
| ei->i_acl = EXT3_ACL_NOT_CACHED; |
| ei->i_default_acl = EXT3_ACL_NOT_CACHED; |
| #endif |
| ei->vfs_inode.i_version = 1; |
| return &ei->vfs_inode; |
| } |
| |
| static void ext3_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); |
| } |
| |
| static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| { |
| struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; |
| |
| if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| SLAB_CTOR_CONSTRUCTOR) { |
| INIT_LIST_HEAD(&ei->i_orphan); |
| init_rwsem(&ei->truncate_sem); |
| inode_init_once(&ei->vfs_inode); |
| } |
| } |
| |
| static int init_inodecache(void) |
| { |
| ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", |
| sizeof(struct ext3_inode_info), |
| 0, SLAB_HWCACHE_ALIGN, |
| init_once, NULL); |
| if (ext3_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| if (kmem_cache_destroy(ext3_inode_cachep)) |
| printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n"); |
| } |
| |
| #ifdef CONFIG_EXT3_FS_POSIX_ACL |
| |
| static void ext3_clear_inode(struct inode *inode) |
| { |
| if (EXT3_I(inode)->i_acl && |
| EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) { |
| posix_acl_release(EXT3_I(inode)->i_acl); |
| EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED; |
| } |
| if (EXT3_I(inode)->i_default_acl && |
| EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) { |
| posix_acl_release(EXT3_I(inode)->i_default_acl); |
| EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED; |
| } |
| } |
| |
| #else |
| # define ext3_clear_inode NULL |
| #endif |
| |
| static struct super_operations ext3_sops = { |
| .alloc_inode = ext3_alloc_inode, |
| .destroy_inode = ext3_destroy_inode, |
| .read_inode = ext3_read_inode, |
| .write_inode = ext3_write_inode, |
| .dirty_inode = ext3_dirty_inode, |
| .put_inode = ext3_put_inode, |
| .delete_inode = ext3_delete_inode, |
| .put_super = ext3_put_super, |
| .write_super = ext3_write_super, |
| .sync_fs = ext3_sync_fs, |
| .write_super_lockfs = ext3_write_super_lockfs, |
| .unlockfs = ext3_unlockfs, |
| .statfs = ext3_statfs, |
| .remount_fs = ext3_remount, |
| .clear_inode = ext3_clear_inode, |
| }; |
| |
| struct dentry *ext3_get_parent(struct dentry *child); |
| static struct export_operations ext3_export_ops = { |
| .get_parent = ext3_get_parent, |
| }; |
| |
| |
| 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; |
| } |
| |
| static unsigned long get_sb_block(void **data) |
| { |
| unsigned long sb_block; |
| char *options = (char *) *data; |
| |
| if (!options || strncmp(options, "sb=", 3) != 0) |
| return 1; /* Default location */ |
| options += 3; |
| sb_block = simple_strtoul(options, &options, 0); |
| if (*options && *options != ',') { |
| printk("EXT3-fs: Invalid sb specification: %s\n", |
| (char *) *data); |
| return 1; |
| } |
| if (*options == ',') |
| options++; |
| *data = (void *) options; |
| return sb_block; |
| } |
| |
| /* |
| * This function has been shamelessly adapted from the msdos fs |
| */ |
| static int parse_options (char * options, struct ext3_sb_info *sbi, |
| unsigned long * inum, int is_remount) |
| { |
| char * this_char; |
| char * value; |
| |
| if (!options) |
| return 1; |
| while ((this_char = strsep (&options, ",")) != NULL) { |
| if (!*this_char) |
| continue; |
| if ((value = strchr (this_char, '=')) != NULL) |
| *value++ = 0; |
| #ifdef CONFIG_EXT3_FS_XATTR |
| if (!strcmp (this_char, "user_xattr")) |
| set_opt (sbi->s_mount_opt, XATTR_USER); |
| else if (!strcmp (this_char, "nouser_xattr")) |
| clear_opt (sbi->s_mount_opt, XATTR_USER); |
| else |
| #endif |
| #ifdef CONFIG_EXT3_FS_POSIX_ACL |
| if (!strcmp(this_char, "acl")) |
| set_opt (sbi->s_mount_opt, POSIX_ACL); |
| else if (!strcmp(this_char, "noacl")) |
| clear_opt (sbi->s_mount_opt, POSIX_ACL); |
| else |
| #endif |
| if (!strcmp (this_char, "bsddf")) |
| clear_opt (sbi->s_mount_opt, MINIX_DF); |
| else if (!strcmp (this_char, "nouid32")) { |
| set_opt (sbi->s_mount_opt, NO_UID32); |
| } |
| else if (!strcmp (this_char, "abort")) |
| set_opt (sbi->s_mount_opt, ABORT); |
| else if (!strcmp (this_char, "check")) { |
| if (!value || !*value || !strcmp (value, "none")) |
| clear_opt (sbi->s_mount_opt, CHECK); |
| else |
| #ifdef CONFIG_EXT3_CHECK |
| set_opt (sbi->s_mount_opt, CHECK); |
| #else |
| printk(KERN_ERR |
| "EXT3 Check option not supported\n"); |
| #endif |
| } |
| else if (!strcmp (this_char, "debug")) |
| set_opt (sbi->s_mount_opt, DEBUG); |
| else if (!strcmp (this_char, "errors")) { |
| if (want_value(value, "errors")) |
| return 0; |
| if (!strcmp (value, "continue")) { |
| clear_opt (sbi->s_mount_opt, ERRORS_RO); |
| clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
| set_opt (sbi->s_mount_opt, ERRORS_CONT); |
| } |
| else if (!strcmp (value, "remount-ro")) { |
| clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
| clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
| set_opt (sbi->s_mount_opt, ERRORS_RO); |
| } |
| else if (!strcmp (value, "panic")) { |
| clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
| clear_opt (sbi->s_mount_opt, ERRORS_RO); |
| set_opt (sbi->s_mount_opt, 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 (sbi->s_mount_opt, GRPID); |
| else if (!strcmp (this_char, "minixdf")) |
| set_opt (sbi->s_mount_opt, MINIX_DF); |
| else if (!strcmp (this_char, "nocheck")) |
| clear_opt (sbi->s_mount_opt, CHECK); |
| else if (!strcmp (this_char, "nogrpid") || |
| !strcmp (this_char, "sysvgroups")) |
| clear_opt (sbi->s_mount_opt, GRPID); |
| else if (!strcmp (this_char, "resgid")) { |
| unsigned long v; |
| if (want_numeric(value, "resgid", &v)) |
| return 0; |
| sbi->s_resgid = v; |
| } |
| else if (!strcmp (this_char, "resuid")) { |
| unsigned long v; |
| if (want_numeric(value, "resuid", &v)) |
| return 0; |
| sbi->s_resuid = v; |
| } |
| else if (!strcmp (this_char, "oldalloc")) |
| set_opt (sbi->s_mount_opt, OLDALLOC); |
| else if (!strcmp (this_char, "orlov")) |
| clear_opt (sbi->s_mount_opt, OLDALLOC); |
| #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 (sbi->s_mount_opt, UPDATE_JOURNAL); |
| else if (want_numeric(value, "journal", inum)) |
| return 0; |
| } |
| else if (!strcmp (this_char, "noload")) |
| set_opt (sbi->s_mount_opt, 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 ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS) != |
| data_opt) { |
| printk(KERN_ERR |
| "EXT3-fs: cannot change data " |
| "mode on remount\n"); |
| return 0; |
| } |
| } else { |
| sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS; |
| sbi->s_mount_opt |= data_opt; |
| } |
| } else if (!strcmp (this_char, "commit")) { |
| unsigned long v; |
| if (want_numeric(value, "commit", &v)) |
| return 0; |
| sbi->s_commit_interval = (HZ * v); |
| } 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) <= get_seconds())) |
| 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(get_seconds()); |
| 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, ", |
| sb->s_id); |
| 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", |
| sb->s_id); |
| sb->s_flags &= ~MS_RDONLY; |
| } |
| |
| if (EXT3_SB(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 |
| "%s: truncating inode %ld to %Ld bytes\n", |
| __FUNCTION__, 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 |
| "%s: deleting unreferenced inode %ld\n", |
| __FUNCTION__, 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", |
| sb->s_id, PLURAL(nr_orphans)); |
| if (nr_truncates) |
| printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n", |
| sb->s_id, 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; |
| } |
| |
| static unsigned long descriptor_loc(struct super_block *sb, |
| unsigned long logic_sb_block, |
| int nr) |
| { |
| struct ext3_sb_info *sbi = EXT3_SB(sb); |
| unsigned long bg, first_data_block, first_meta_bg; |
| int has_super = 0; |
| |
| first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); |
| first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| |
| if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || |
| nr < first_meta_bg) |
| return (logic_sb_block + nr + 1); |
| bg = sbi->s_desc_per_block * nr; |
| if (ext3_bg_has_super(sb, bg)) |
| has_super = 1; |
| return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); |
| } |
| |
| |
| static int ext3_fill_super (struct super_block *sb, void *data, int silent) |
| { |
| struct buffer_head * bh; |
| struct ext3_super_block *es = 0; |
| struct ext3_sb_info *sbi; |
| unsigned long sb_block = get_sb_block(&data); |
| unsigned long block, logic_sb_block = 1; |
| unsigned long offset = 0; |
| unsigned long journal_inum = 0; |
| unsigned long def_mount_opts; |
| int blocksize; |
| int hblock; |
| int db_count; |
| int i; |
| int needs_recovery; |
| |
| #ifdef CONFIG_JBD_DEBUG |
| ext3_ro_after = 0; |
| #endif |
| sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); |
| if (!sbi) |
| return -ENOMEM; |
| sb->s_fs_info = sbi; |
| memset(sbi, 0, sizeof(*sbi)); |
| sbi->s_mount_opt = 0; |
| sbi->s_resuid = EXT3_DEF_RESUID; |
| sbi->s_resgid = EXT3_DEF_RESGID; |
| setup_ro_after(sb); |
| |
| blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); |
| if (!blocksize) { |
| printk(KERN_ERR "EXT3-fs: unable to set blocksize\n"); |
| goto out_fail; |
| } |
| |
| /* |
| * 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 = sb_bread(sb, logic_sb_block))) { |
| 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", |
| sb->s_id); |
| goto failed_mount; |
| } |
| |
| /* Set defaults before we parse the mount options */ |
| def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| if (def_mount_opts & EXT3_DEFM_DEBUG) |
| set_opt(sbi->s_mount_opt, DEBUG); |
| if (def_mount_opts & EXT3_DEFM_BSDGROUPS) |
| set_opt(sbi->s_mount_opt, GRPID); |
| if (def_mount_opts & EXT3_DEFM_UID16) |
| set_opt(sbi->s_mount_opt, NO_UID32); |
| if (def_mount_opts & EXT3_DEFM_XATTR_USER) |
| set_opt(sbi->s_mount_opt, XATTR_USER); |
| if (def_mount_opts & EXT3_DEFM_ACL) |
| set_opt(sbi->s_mount_opt, POSIX_ACL); |
| if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) |
| sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA; |
| else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) |
| sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA; |
| else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) |
| sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA; |
| |
| if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) |
| set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
| else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO) |
| set_opt(sbi->s_mount_opt, ERRORS_RO); |
| |
| sbi->s_resuid = le16_to_cpu(es->s_def_resuid); |
| sbi->s_resgid = le16_to_cpu(es->s_def_resgid); |
| |
| if (!parse_options ((char *) data, sbi, &journal_inum, 0)) |
| goto failed_mount; |
| |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| |
| 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", |
| sb->s_id, 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", |
| sb->s_id, i); |
| goto failed_mount; |
| } |
| blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
| |
| if (blocksize < EXT3_MIN_BLOCK_SIZE || |
| blocksize > EXT3_MAX_BLOCK_SIZE) { |
| printk(KERN_ERR |
| "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n", |
| blocksize, sb->s_id); |
| goto failed_mount; |
| } |
| |
| sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); |
| |
| hblock = bdev_hardsect_size(sb->s_bdev); |
| if (sb->s_blocksize != blocksize) { |
| /* |
| * Make sure the blocksize for the filesystem is larger |
| * than the hardware sectorsize for the machine. |
| */ |
| if (blocksize < hblock) { |
| printk(KERN_ERR "EXT3-fs: blocksize %d too small for " |
| "device blocksize %d.\n", blocksize, hblock); |
| goto failed_mount; |
| } |
| |
| brelse (bh); |
| sb_set_blocksize(sb, blocksize); |
| logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; |
| offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; |
| bh = sb_bread(sb, logic_sb_block); |
| if (!bh) { |
| printk(KERN_ERR |
| "EXT3-fs: Can't read superblock on 2nd try.\n"); |
| return -EINVAL; |
| } |
| 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) || |
| (sbi->s_inode_size & (sbi->s_inode_size - 1)) || |
| (sbi->s_inode_size > blocksize)) { |
| 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; |
| 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)); |
| for (i=0; i < 4; i++) |
| sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); |
| sbi->s_def_hash_version = es->s_def_hash_version; |
| |
| 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; |
| } |
| sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), |
| GFP_KERNEL); |
| if (!sbi->s_debts) { |
| printk ("EXT3-fs: not enough memory\n"); |
| goto failed_mount2; |
| } |
| memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); |
| for (i = 0; i < db_count; i++) { |
| block = descriptor_loc(sb, logic_sb_block, i); |
| sbi->s_group_desc[i] = sb_bread(sb, block); |
| 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; |
| } |
| sbi->s_gdb_count = db_count; |
| sbi->s_dir_count = ext3_count_dirs(sb); |
| /* |
| * set up enough so that it can read an inode |
| */ |
| sb->s_op = &ext3_sops; |
| sb->s_export_op = &ext3_export_ops; |
| 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", |
| sb->s_id); |
| 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 0; |
| |
| failed_mount3: |
| journal_destroy(sbi->s_journal); |
| failed_mount2: |
| if (sbi->s_debts) |
| kfree(sbi->s_debts); |
| 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: |
| sb->s_fs_info = NULL; |
| kfree(sbi); |
| return -EINVAL; |
| } |
| |
| /* |
| * Setup any per-fs journal parameters now. We'll do this both on |
| * initial mount, once the journal has been initialised but before we've |
| * done any recovery; and again on any subsequent remount. |
| */ |
| static void ext3_init_journal_params(struct ext3_sb_info *sbi, |
| journal_t *journal) |
| { |
| if (sbi->s_commit_interval) |
| journal->j_commit_interval = sbi->s_commit_interval; |
| /* We could also set up an ext3-specific default for the commit |
| * interval here, but for now we'll just fall back to the jbd |
| * default. */ |
| } |
| |
| |
| 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); |
| } |
| ext3_init_journal_params(EXT3_SB(sb), journal); |
| return journal; |
| } |
| |
| static journal_t *ext3_get_dev_journal(struct super_block *sb, |
| dev_t j_dev) |
| { |
| struct buffer_head * bh; |
| journal_t *journal; |
| int start; |
| int len; |
| int hblock, blocksize; |
| unsigned long sb_block; |
| unsigned long offset; |
| struct ext3_super_block * es; |
| struct block_device *bdev; |
| |
| bdev = ext3_blkdev_get(j_dev); |
| if (bdev == NULL) |
| return NULL; |
| |
| blocksize = sb->s_blocksize; |
| hblock = bdev_hardsect_size(bdev); |
| 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(bdev, blocksize); |
| if (!(bh = __bread(bdev, 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(bdev, sb->s_bdev, |
| 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; |
| ext3_init_journal_params(EXT3_SB(sb), journal); |
| 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); |
| dev_t journal_dev = le32_to_cpu(es->s_journal_dev); |
| int err = 0; |
| int really_read_only; |
| |
| really_read_only = bdev_read_only(sb->s_bdev); |
| |
| /* |
| * 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(get_seconds()); |
| BUFFER_TRACE(EXT3_SB(sb)->s_sbh, "marking dirty"); |
| mark_buffer_dirty(EXT3_SB(sb)->s_sbh); |
| if (sync) { |
| ll_rw_block(WRITE, 1, &EXT3_SB(sb)->s_sbh); |
| wait_on_buffer(EXT3_SB(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."); |
| |
| EXT3_SB(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(). |
| */ |
| |
| void ext3_write_super (struct super_block * sb) |
| { |
| lock_kernel(); |
| if (down_trylock(&sb->s_lock) == 0) |
| BUG(); |
| sb->s_dirt = 0; |
| log_start_commit(EXT3_SB(sb)->s_journal, NULL); |
| unlock_kernel(); |
| } |
| |
| static int ext3_sync_fs(struct super_block *sb, int wait) |
| { |
| tid_t target; |
| |
| lock_kernel(); |
| sb->s_dirt = 0; |
| target = log_start_commit(EXT3_SB(sb)->s_journal, NULL); |
| if (wait) |
| log_wait_commit(EXT3_SB(sb)->s_journal, target); |
| unlock_kernel(); |
| return 0; |
| } |
| |
| /* |
| * 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, sbi, &tmp, 1)) |
| return -EINVAL; |
| |
| if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) |
| ext3_abort(sb, __FUNCTION__, "Abort forced by user"); |
| |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| |
| es = sbi->s_es; |
| |
| ext3_init_journal_params(sbi, sbi->s_journal); |
| |
| 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", |
| sb->s_id, 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 struct super_block *ext3_get_sb(struct file_system_type *fs_type, |
| int flags, char *dev_name, void *data) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super); |
| } |
| |
| static struct file_system_type ext3_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext3", |
| .get_sb = ext3_get_sb, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| static int __init init_ext3_fs(void) |
| { |
| int err = init_ext3_xattr(); |
| if (err) |
| return err; |
| err = init_inodecache(); |
| if (err) |
| goto out1; |
| err = register_filesystem(&ext3_fs_type); |
| if (err) |
| goto out; |
| return 0; |
| out: |
| destroy_inodecache(); |
| out1: |
| exit_ext3_xattr(); |
| return err; |
| } |
| |
| static void __exit exit_ext3_fs(void) |
| { |
| unregister_filesystem(&ext3_fs_type); |
| destroy_inodecache(); |
| exit_ext3_xattr(); |
| } |
| |
| 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) |