| /* |
| * linux/fs/ext4/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/module.h> |
| #include <linux/string.h> |
| #include <linux/fs.h> |
| #include <linux/time.h> |
| #include <linux/jbd2.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/parser.h> |
| #include <linux/smp_lock.h> |
| #include <linux/buffer_head.h> |
| #include <linux/exportfs.h> |
| #include <linux/vfs.h> |
| #include <linux/random.h> |
| #include <linux/mount.h> |
| #include <linux/namei.h> |
| #include <linux/quotaops.h> |
| #include <linux/seq_file.h> |
| #include <linux/proc_fs.h> |
| #include <linux/marker.h> |
| #include <linux/log2.h> |
| #include <linux/crc16.h> |
| #include <asm/uaccess.h> |
| |
| #include "ext4.h" |
| #include "ext4_jbd2.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include "namei.h" |
| #include "group.h" |
| |
| struct proc_dir_entry *ext4_proc_root; |
| |
| static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
| unsigned long journal_devnum); |
| static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
| unsigned int); |
| static void ext4_commit_super(struct super_block *sb, |
| struct ext4_super_block *es, int sync); |
| static void ext4_mark_recovery_complete(struct super_block *sb, |
| struct ext4_super_block *es); |
| static void ext4_clear_journal_err(struct super_block *sb, |
| struct ext4_super_block *es); |
| static int ext4_sync_fs(struct super_block *sb, int wait); |
| static const char *ext4_decode_error(struct super_block *sb, int errno, |
| char nbuf[16]); |
| static int ext4_remount(struct super_block *sb, int *flags, char *data); |
| static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); |
| static void ext4_unlockfs(struct super_block *sb); |
| static void ext4_write_super(struct super_block *sb); |
| static void ext4_write_super_lockfs(struct super_block *sb); |
| |
| |
| ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_block_bitmap_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); |
| } |
| |
| ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_inode_bitmap_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); |
| } |
| |
| ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
| struct ext4_group_desc *bg) |
| { |
| return le32_to_cpu(bg->bg_inode_table_lo) | |
| (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
| (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); |
| } |
| |
| void ext4_block_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_inode_bitmap_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| void ext4_inode_table_set(struct super_block *sb, |
| struct ext4_group_desc *bg, ext4_fsblk_t blk) |
| { |
| bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
| if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
| bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); |
| } |
| |
| /* |
| * Wrappers for jbd2_journal_start/end. |
| * |
| * The only special thing we need to do here is to make sure that all |
| * journal_end calls result in the superblock being marked dirty, so |
| * that sync() will call the filesystem's write_super callback if |
| * appropriate. |
| */ |
| handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
| { |
| journal_t *journal; |
| |
| if (sb->s_flags & MS_RDONLY) |
| return ERR_PTR(-EROFS); |
| |
| /* Special case here: if the journal has aborted behind our |
| * backs (eg. EIO in the commit thread), then we still need to |
| * take the FS itself readonly cleanly. */ |
| journal = EXT4_SB(sb)->s_journal; |
| if (is_journal_aborted(journal)) { |
| ext4_abort(sb, __func__, |
| "Detected aborted journal"); |
| return ERR_PTR(-EROFS); |
| } |
| |
| return jbd2_journal_start(journal, nblocks); |
| } |
| |
| /* |
| * The only special thing we need to do here is to make sure that all |
| * jbd2_journal_stop calls result in the superblock being marked dirty, so |
| * that sync() will call the filesystem's write_super callback if |
| * appropriate. |
| */ |
| int __ext4_journal_stop(const char *where, handle_t *handle) |
| { |
| struct super_block *sb; |
| int err; |
| int rc; |
| |
| sb = handle->h_transaction->t_journal->j_private; |
| err = handle->h_err; |
| rc = jbd2_journal_stop(handle); |
| |
| if (!err) |
| err = rc; |
| if (err) |
| __ext4_std_error(sb, where, err); |
| return err; |
| } |
| |
| void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
| struct buffer_head *bh, handle_t *handle, int err) |
| { |
| char nbuf[16]; |
| const char *errstr = ext4_decode_error(NULL, err, nbuf); |
| |
| if (bh) |
| BUFFER_TRACE(bh, "abort"); |
| |
| if (!handle->h_err) |
| handle->h_err = err; |
| |
| if (is_handle_aborted(handle)) |
| return; |
| |
| printk(KERN_ERR "%s: aborting transaction: %s in %s\n", |
| caller, errstr, err_fn); |
| |
| jbd2_journal_abort_handle(handle); |
| } |
| |
| /* 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 ext4, 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 jbd2_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 ext4_handle_error(struct super_block *sb) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| |
| if (sb->s_flags & MS_RDONLY) |
| return; |
| |
| if (!test_opt(sb, ERRORS_CONT)) { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
| if (journal) |
| jbd2_journal_abort(journal, -EIO); |
| } |
| if (test_opt(sb, ERRORS_RO)) { |
| printk(KERN_CRIT "Remounting filesystem read-only\n"); |
| sb->s_flags |= MS_RDONLY; |
| } |
| ext4_commit_super(sb, es, 1); |
| if (test_opt(sb, ERRORS_PANIC)) |
| panic("EXT4-fs (device %s): panic forced after error\n", |
| sb->s_id); |
| } |
| |
| void ext4_error(struct super_block *sb, const char *function, |
| const char *fmt, ...) |
| { |
| va_list args; |
| |
| va_start(args, fmt); |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); |
| vprintk(fmt, args); |
| printk("\n"); |
| va_end(args); |
| |
| ext4_handle_error(sb); |
| } |
| |
| static const char *ext4_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 || EXT4_SB(sb)->s_journal->j_flags & JBD2_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; |
| } |
| |
| /* __ext4_std_error decodes expected errors from journaling functions |
| * automatically and invokes the appropriate error response. */ |
| |
| void __ext4_std_error(struct super_block *sb, const char *function, int errno) |
| { |
| char nbuf[16]; |
| const char *errstr; |
| |
| /* Special case: if the error is EROFS, and we're not already |
| * inside a transaction, then there's really no point in logging |
| * an error. */ |
| if (errno == -EROFS && journal_current_handle() == NULL && |
| (sb->s_flags & MS_RDONLY)) |
| return; |
| |
| errstr = ext4_decode_error(sb, errno, nbuf); |
| printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", |
| sb->s_id, function, errstr); |
| |
| ext4_handle_error(sb); |
| } |
| |
| /* |
| * ext4_abort is a much stronger failure handler than ext4_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 ext4_abort(struct super_block *sb, const char *function, |
| const char *fmt, ...) |
| { |
| va_list args; |
| |
| printk(KERN_CRIT "ext4_abort called.\n"); |
| |
| va_start(args, fmt); |
| printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); |
| vprintk(fmt, args); |
| printk("\n"); |
| va_end(args); |
| |
| if (test_opt(sb, ERRORS_PANIC)) |
| panic("EXT4-fs panic from previous error\n"); |
| |
| if (sb->s_flags & MS_RDONLY) |
| return; |
| |
| printk(KERN_CRIT "Remounting filesystem read-only\n"); |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| sb->s_flags |= MS_RDONLY; |
| EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
| jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
| } |
| |
| void ext4_warning(struct super_block *sb, const char *function, |
| const char *fmt, ...) |
| { |
| va_list args; |
| |
| va_start(args, fmt); |
| printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
| sb->s_id, function); |
| vprintk(fmt, args); |
| printk("\n"); |
| va_end(args); |
| } |
| |
| void ext4_update_dynamic_rev(struct super_block *sb) |
| { |
| struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
| |
| if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
| return; |
| |
| ext4_warning(sb, __func__, |
| "updating to rev %d because of new feature flag, " |
| "running e2fsck is recommended", |
| EXT4_DYNAMIC_REV); |
| |
| es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
| es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); |
| es->s_rev_level = cpu_to_le32(EXT4_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. |
| */ |
| } |
| |
| int ext4_update_compat_feature(handle_t *handle, |
| struct super_block *sb, __u32 compat) |
| { |
| int err = 0; |
| if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { |
| err = ext4_journal_get_write_access(handle, |
| EXT4_SB(sb)->s_sbh); |
| if (err) |
| return err; |
| EXT4_SET_COMPAT_FEATURE(sb, compat); |
| sb->s_dirt = 1; |
| handle->h_sync = 1; |
| BUFFER_TRACE(EXT4_SB(sb)->s_sbh, |
| "call ext4_journal_dirty_met adata"); |
| err = ext4_journal_dirty_metadata(handle, |
| EXT4_SB(sb)->s_sbh); |
| } |
| return err; |
| } |
| |
| int ext4_update_rocompat_feature(handle_t *handle, |
| struct super_block *sb, __u32 rocompat) |
| { |
| int err = 0; |
| if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { |
| err = ext4_journal_get_write_access(handle, |
| EXT4_SB(sb)->s_sbh); |
| if (err) |
| return err; |
| EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); |
| sb->s_dirt = 1; |
| handle->h_sync = 1; |
| BUFFER_TRACE(EXT4_SB(sb)->s_sbh, |
| "call ext4_journal_dirty_met adata"); |
| err = ext4_journal_dirty_metadata(handle, |
| EXT4_SB(sb)->s_sbh); |
| } |
| return err; |
| } |
| |
| int ext4_update_incompat_feature(handle_t *handle, |
| struct super_block *sb, __u32 incompat) |
| { |
| int err = 0; |
| if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { |
| err = ext4_journal_get_write_access(handle, |
| EXT4_SB(sb)->s_sbh); |
| if (err) |
| return err; |
| EXT4_SET_INCOMPAT_FEATURE(sb, incompat); |
| sb->s_dirt = 1; |
| handle->h_sync = 1; |
| BUFFER_TRACE(EXT4_SB(sb)->s_sbh, |
| "call ext4_journal_dirty_met adata"); |
| err = ext4_journal_dirty_metadata(handle, |
| EXT4_SB(sb)->s_sbh); |
| } |
| return err; |
| } |
| |
| /* |
| * Open the external journal device |
| */ |
| static struct block_device *ext4_blkdev_get(dev_t dev) |
| { |
| struct block_device *bdev; |
| char b[BDEVNAME_SIZE]; |
| |
| bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
| if (IS_ERR(bdev)) |
| goto fail; |
| return bdev; |
| |
| fail: |
| printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
| __bdevname(dev, b), PTR_ERR(bdev)); |
| return NULL; |
| } |
| |
| /* |
| * Release the journal device |
| */ |
| static int ext4_blkdev_put(struct block_device *bdev) |
| { |
| bd_release(bdev); |
| return blkdev_put(bdev); |
| } |
| |
| static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
| { |
| struct block_device *bdev; |
| int ret = -ENODEV; |
| |
| bdev = sbi->journal_bdev; |
| if (bdev) { |
| ret = ext4_blkdev_put(bdev); |
| sbi->journal_bdev = NULL; |
| } |
| return ret; |
| } |
| |
| static inline struct inode *orphan_list_entry(struct list_head *l) |
| { |
| return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
| } |
| |
| static void dump_orphan_list(struct super_block *sb, struct ext4_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:%lu at %p: mode %o, nlink %d, next %d\n", |
| inode->i_sb->s_id, inode->i_ino, inode, |
| inode->i_mode, inode->i_nlink, |
| NEXT_ORPHAN(inode)); |
| } |
| } |
| |
| static void ext4_put_super(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| int i; |
| |
| ext4_mb_release(sb); |
| ext4_ext_release(sb); |
| ext4_xattr_put_super(sb); |
| if (jbd2_journal_destroy(sbi->s_journal) < 0) |
| ext4_abort(sb, __func__, "Couldn't clean up the journal"); |
| sbi->s_journal = NULL; |
| if (!(sb->s_flags & MS_RDONLY)) { |
| EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| es->s_state = cpu_to_le16(sbi->s_mount_state); |
| ext4_commit_super(sb, es, 1); |
| } |
| if (sbi->s_proc) { |
| remove_proc_entry("inode_readahead_blks", sbi->s_proc); |
| remove_proc_entry(sb->s_id, ext4_proc_root); |
| } |
| |
| for (i = 0; i < sbi->s_gdb_count; i++) |
| brelse(sbi->s_group_desc[i]); |
| kfree(sbi->s_group_desc); |
| kfree(sbi->s_flex_groups); |
| percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| percpu_counter_destroy(&sbi->s_dirs_counter); |
| percpu_counter_destroy(&sbi->s_dirtyblocks_counter); |
| brelse(sbi->s_sbh); |
| #ifdef CONFIG_QUOTA |
| for (i = 0; i < MAXQUOTAS; i++) |
| kfree(sbi->s_qf_names[i]); |
| #endif |
| |
| /* 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); |
| 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); |
| ext4_blkdev_remove(sbi); |
| } |
| sb->s_fs_info = NULL; |
| kfree(sbi); |
| return; |
| } |
| |
| static struct kmem_cache *ext4_inode_cachep; |
| |
| /* |
| * Called inside transaction, so use GFP_NOFS |
| */ |
| static struct inode *ext4_alloc_inode(struct super_block *sb) |
| { |
| struct ext4_inode_info *ei; |
| |
| ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
| if (!ei) |
| return NULL; |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| ei->i_acl = EXT4_ACL_NOT_CACHED; |
| ei->i_default_acl = EXT4_ACL_NOT_CACHED; |
| #endif |
| ei->vfs_inode.i_version = 1; |
| ei->vfs_inode.i_data.writeback_index = 0; |
| memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
| INIT_LIST_HEAD(&ei->i_prealloc_list); |
| spin_lock_init(&ei->i_prealloc_lock); |
| jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); |
| ei->i_reserved_data_blocks = 0; |
| ei->i_reserved_meta_blocks = 0; |
| ei->i_allocated_meta_blocks = 0; |
| ei->i_delalloc_reserved_flag = 0; |
| spin_lock_init(&(ei->i_block_reservation_lock)); |
| return &ei->vfs_inode; |
| } |
| |
| static void ext4_destroy_inode(struct inode *inode) |
| { |
| if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
| printk("EXT4 Inode %p: orphan list check failed!\n", |
| EXT4_I(inode)); |
| print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, |
| EXT4_I(inode), sizeof(struct ext4_inode_info), |
| true); |
| dump_stack(); |
| } |
| kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
| |
| INIT_LIST_HEAD(&ei->i_orphan); |
| #ifdef CONFIG_EXT4_FS_XATTR |
| init_rwsem(&ei->xattr_sem); |
| #endif |
| init_rwsem(&ei->i_data_sem); |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| static int init_inodecache(void) |
| { |
| ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
| sizeof(struct ext4_inode_info), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| init_once); |
| if (ext4_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void destroy_inodecache(void) |
| { |
| kmem_cache_destroy(ext4_inode_cachep); |
| } |
| |
| static void ext4_clear_inode(struct inode *inode) |
| { |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| if (EXT4_I(inode)->i_acl && |
| EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { |
| posix_acl_release(EXT4_I(inode)->i_acl); |
| EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; |
| } |
| if (EXT4_I(inode)->i_default_acl && |
| EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { |
| posix_acl_release(EXT4_I(inode)->i_default_acl); |
| EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; |
| } |
| #endif |
| ext4_discard_preallocations(inode); |
| jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, |
| &EXT4_I(inode)->jinode); |
| } |
| |
| static inline void ext4_show_quota_options(struct seq_file *seq, |
| struct super_block *sb) |
| { |
| #if defined(CONFIG_QUOTA) |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (sbi->s_jquota_fmt) |
| seq_printf(seq, ",jqfmt=%s", |
| (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); |
| |
| if (sbi->s_qf_names[USRQUOTA]) |
| seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); |
| |
| if (sbi->s_qf_names[GRPQUOTA]) |
| seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); |
| |
| if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
| seq_puts(seq, ",usrquota"); |
| |
| if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
| seq_puts(seq, ",grpquota"); |
| #endif |
| } |
| |
| /* |
| * Show an option if |
| * - it's set to a non-default value OR |
| * - if the per-sb default is different from the global default |
| */ |
| static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| { |
| int def_errors; |
| unsigned long def_mount_opts; |
| struct super_block *sb = vfs->mnt_sb; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| |
| def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| def_errors = le16_to_cpu(es->s_errors); |
| |
| if (sbi->s_sb_block != 1) |
| seq_printf(seq, ",sb=%llu", sbi->s_sb_block); |
| if (test_opt(sb, MINIX_DF)) |
| seq_puts(seq, ",minixdf"); |
| if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) |
| seq_puts(seq, ",grpid"); |
| if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) |
| seq_puts(seq, ",nogrpid"); |
| if (sbi->s_resuid != EXT4_DEF_RESUID || |
| le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { |
| seq_printf(seq, ",resuid=%u", sbi->s_resuid); |
| } |
| if (sbi->s_resgid != EXT4_DEF_RESGID || |
| le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { |
| seq_printf(seq, ",resgid=%u", sbi->s_resgid); |
| } |
| if (test_opt(sb, ERRORS_RO)) { |
| if (def_errors == EXT4_ERRORS_PANIC || |
| def_errors == EXT4_ERRORS_CONTINUE) { |
| seq_puts(seq, ",errors=remount-ro"); |
| } |
| } |
| if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) |
| seq_puts(seq, ",errors=continue"); |
| if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) |
| seq_puts(seq, ",errors=panic"); |
| if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) |
| seq_puts(seq, ",nouid32"); |
| if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) |
| seq_puts(seq, ",debug"); |
| if (test_opt(sb, OLDALLOC)) |
| seq_puts(seq, ",oldalloc"); |
| #ifdef CONFIG_EXT4_FS_XATTR |
| if (test_opt(sb, XATTR_USER) && |
| !(def_mount_opts & EXT4_DEFM_XATTR_USER)) |
| seq_puts(seq, ",user_xattr"); |
| if (!test_opt(sb, XATTR_USER) && |
| (def_mount_opts & EXT4_DEFM_XATTR_USER)) { |
| seq_puts(seq, ",nouser_xattr"); |
| } |
| #endif |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) |
| seq_puts(seq, ",acl"); |
| if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) |
| seq_puts(seq, ",noacl"); |
| #endif |
| if (!test_opt(sb, RESERVATION)) |
| seq_puts(seq, ",noreservation"); |
| if (sbi->s_commit_interval) { |
| seq_printf(seq, ",commit=%u", |
| (unsigned) (sbi->s_commit_interval / HZ)); |
| } |
| /* |
| * We're changing the default of barrier mount option, so |
| * let's always display its mount state so it's clear what its |
| * status is. |
| */ |
| seq_puts(seq, ",barrier="); |
| seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); |
| if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) |
| seq_puts(seq, ",journal_async_commit"); |
| if (test_opt(sb, NOBH)) |
| seq_puts(seq, ",nobh"); |
| if (!test_opt(sb, EXTENTS)) |
| seq_puts(seq, ",noextents"); |
| if (test_opt(sb, I_VERSION)) |
| seq_puts(seq, ",i_version"); |
| if (!test_opt(sb, DELALLOC)) |
| seq_puts(seq, ",nodelalloc"); |
| |
| |
| if (sbi->s_stripe) |
| seq_printf(seq, ",stripe=%lu", sbi->s_stripe); |
| /* |
| * journal mode get enabled in different ways |
| * So just print the value even if we didn't specify it |
| */ |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
| seq_puts(seq, ",data=journal"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
| seq_puts(seq, ",data=ordered"); |
| else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
| seq_puts(seq, ",data=writeback"); |
| |
| if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) |
| seq_printf(seq, ",inode_readahead_blks=%u", |
| sbi->s_inode_readahead_blks); |
| |
| if (test_opt(sb, DATA_ERR_ABORT)) |
| seq_puts(seq, ",data_err=abort"); |
| |
| ext4_show_quota_options(seq, sb); |
| return 0; |
| } |
| |
| |
| static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
| u64 ino, u32 generation) |
| { |
| struct inode *inode; |
| |
| if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
| return ERR_PTR(-ESTALE); |
| if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
| return ERR_PTR(-ESTALE); |
| |
| /* iget isn't really right if the inode is currently unallocated!! |
| * |
| * ext4_read_inode will return a bad_inode if the inode had been |
| * deleted, so we should be safe. |
| * |
| * Currently we don't know the generation for parent directory, so |
| * a generation of 0 means "accept any" |
| */ |
| inode = ext4_iget(sb, ino); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| if (generation && inode->i_generation != generation) { |
| iput(inode); |
| return ERR_PTR(-ESTALE); |
| } |
| |
| return inode; |
| } |
| |
| static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| ext4_nfs_get_inode); |
| } |
| |
| static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, |
| int fh_len, int fh_type) |
| { |
| return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| ext4_nfs_get_inode); |
| } |
| |
| #ifdef CONFIG_QUOTA |
| #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") |
| #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) |
| |
| static int ext4_dquot_initialize(struct inode *inode, int type); |
| static int ext4_dquot_drop(struct inode *inode); |
| static int ext4_write_dquot(struct dquot *dquot); |
| static int ext4_acquire_dquot(struct dquot *dquot); |
| static int ext4_release_dquot(struct dquot *dquot); |
| static int ext4_mark_dquot_dirty(struct dquot *dquot); |
| static int ext4_write_info(struct super_block *sb, int type); |
| static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
| char *path, int remount); |
| static int ext4_quota_on_mount(struct super_block *sb, int type); |
| static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
| size_t len, loff_t off); |
| static ssize_t ext4_quota_write(struct super_block *sb, int type, |
| const char *data, size_t len, loff_t off); |
| |
| static struct dquot_operations ext4_quota_operations = { |
| .initialize = ext4_dquot_initialize, |
| .drop = ext4_dquot_drop, |
| .alloc_space = dquot_alloc_space, |
| .alloc_inode = dquot_alloc_inode, |
| .free_space = dquot_free_space, |
| .free_inode = dquot_free_inode, |
| .transfer = dquot_transfer, |
| .write_dquot = ext4_write_dquot, |
| .acquire_dquot = ext4_acquire_dquot, |
| .release_dquot = ext4_release_dquot, |
| .mark_dirty = ext4_mark_dquot_dirty, |
| .write_info = ext4_write_info |
| }; |
| |
| static struct quotactl_ops ext4_qctl_operations = { |
| .quota_on = ext4_quota_on, |
| .quota_off = vfs_quota_off, |
| .quota_sync = vfs_quota_sync, |
| .get_info = vfs_get_dqinfo, |
| .set_info = vfs_set_dqinfo, |
| .get_dqblk = vfs_get_dqblk, |
| .set_dqblk = vfs_set_dqblk |
| }; |
| #endif |
| |
| static const struct super_operations ext4_sops = { |
| .alloc_inode = ext4_alloc_inode, |
| .destroy_inode = ext4_destroy_inode, |
| .write_inode = ext4_write_inode, |
| .dirty_inode = ext4_dirty_inode, |
| .delete_inode = ext4_delete_inode, |
| .put_super = ext4_put_super, |
| .write_super = ext4_write_super, |
| .sync_fs = ext4_sync_fs, |
| .write_super_lockfs = ext4_write_super_lockfs, |
| .unlockfs = ext4_unlockfs, |
| .statfs = ext4_statfs, |
| .remount_fs = ext4_remount, |
| .clear_inode = ext4_clear_inode, |
| .show_options = ext4_show_options, |
| #ifdef CONFIG_QUOTA |
| .quota_read = ext4_quota_read, |
| .quota_write = ext4_quota_write, |
| #endif |
| }; |
| |
| static const struct export_operations ext4_export_ops = { |
| .fh_to_dentry = ext4_fh_to_dentry, |
| .fh_to_parent = ext4_fh_to_parent, |
| .get_parent = ext4_get_parent, |
| }; |
| |
| enum { |
| Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
| Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, |
| Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, |
| Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
| Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, |
| Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, |
| Opt_journal_checksum, Opt_journal_async_commit, |
| Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
| Opt_data_err_abort, Opt_data_err_ignore, |
| Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, |
| Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, |
| Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, |
| Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, |
| Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc, |
| Opt_inode_readahead_blks |
| }; |
| |
| static match_table_t tokens = { |
| {Opt_bsd_df, "bsddf"}, |
| {Opt_minix_df, "minixdf"}, |
| {Opt_grpid, "grpid"}, |
| {Opt_grpid, "bsdgroups"}, |
| {Opt_nogrpid, "nogrpid"}, |
| {Opt_nogrpid, "sysvgroups"}, |
| {Opt_resgid, "resgid=%u"}, |
| {Opt_resuid, "resuid=%u"}, |
| {Opt_sb, "sb=%u"}, |
| {Opt_err_cont, "errors=continue"}, |
| {Opt_err_panic, "errors=panic"}, |
| {Opt_err_ro, "errors=remount-ro"}, |
| {Opt_nouid32, "nouid32"}, |
| {Opt_nocheck, "nocheck"}, |
| {Opt_nocheck, "check=none"}, |
| {Opt_debug, "debug"}, |
| {Opt_oldalloc, "oldalloc"}, |
| {Opt_orlov, "orlov"}, |
| {Opt_user_xattr, "user_xattr"}, |
| {Opt_nouser_xattr, "nouser_xattr"}, |
| {Opt_acl, "acl"}, |
| {Opt_noacl, "noacl"}, |
| {Opt_reservation, "reservation"}, |
| {Opt_noreservation, "noreservation"}, |
| {Opt_noload, "noload"}, |
| {Opt_nobh, "nobh"}, |
| {Opt_bh, "bh"}, |
| {Opt_commit, "commit=%u"}, |
| {Opt_journal_update, "journal=update"}, |
| {Opt_journal_inum, "journal=%u"}, |
| {Opt_journal_dev, "journal_dev=%u"}, |
| {Opt_journal_checksum, "journal_checksum"}, |
| {Opt_journal_async_commit, "journal_async_commit"}, |
| {Opt_abort, "abort"}, |
| {Opt_data_journal, "data=journal"}, |
| {Opt_data_ordered, "data=ordered"}, |
| {Opt_data_writeback, "data=writeback"}, |
| {Opt_data_err_abort, "data_err=abort"}, |
| {Opt_data_err_ignore, "data_err=ignore"}, |
| {Opt_offusrjquota, "usrjquota="}, |
| {Opt_usrjquota, "usrjquota=%s"}, |
| {Opt_offgrpjquota, "grpjquota="}, |
| {Opt_grpjquota, "grpjquota=%s"}, |
| {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, |
| {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, |
| {Opt_grpquota, "grpquota"}, |
| {Opt_noquota, "noquota"}, |
| {Opt_quota, "quota"}, |
| {Opt_usrquota, "usrquota"}, |
| {Opt_barrier, "barrier=%u"}, |
| {Opt_extents, "extents"}, |
| {Opt_noextents, "noextents"}, |
| {Opt_i_version, "i_version"}, |
| {Opt_mballoc, "mballoc"}, |
| {Opt_nomballoc, "nomballoc"}, |
| {Opt_stripe, "stripe=%u"}, |
| {Opt_resize, "resize"}, |
| {Opt_delalloc, "delalloc"}, |
| {Opt_nodelalloc, "nodelalloc"}, |
| {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, |
| {Opt_err, NULL}, |
| }; |
| |
| static ext4_fsblk_t get_sb_block(void **data) |
| { |
| ext4_fsblk_t sb_block; |
| char *options = (char *) *data; |
| |
| if (!options || strncmp(options, "sb=", 3) != 0) |
| return 1; /* Default location */ |
| options += 3; |
| /*todo: use simple_strtoll with >32bit ext4 */ |
| sb_block = simple_strtoul(options, &options, 0); |
| if (*options && *options != ',') { |
| printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", |
| (char *) *data); |
| return 1; |
| } |
| if (*options == ',') |
| options++; |
| *data = (void *) options; |
| return sb_block; |
| } |
| |
| static int parse_options(char *options, struct super_block *sb, |
| unsigned int *inum, unsigned long *journal_devnum, |
| ext4_fsblk_t *n_blocks_count, int is_remount) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| char *p; |
| substring_t args[MAX_OPT_ARGS]; |
| int data_opt = 0; |
| int option; |
| #ifdef CONFIG_QUOTA |
| int qtype, qfmt; |
| char *qname; |
| #endif |
| ext4_fsblk_t last_block; |
| |
| if (!options) |
| return 1; |
| |
| while ((p = strsep(&options, ",")) != NULL) { |
| int token; |
| if (!*p) |
| continue; |
| |
| token = match_token(p, tokens, args); |
| switch (token) { |
| case Opt_bsd_df: |
| clear_opt(sbi->s_mount_opt, MINIX_DF); |
| break; |
| case Opt_minix_df: |
| set_opt(sbi->s_mount_opt, MINIX_DF); |
| break; |
| case Opt_grpid: |
| set_opt(sbi->s_mount_opt, GRPID); |
| break; |
| case Opt_nogrpid: |
| clear_opt(sbi->s_mount_opt, GRPID); |
| break; |
| case Opt_resuid: |
| if (match_int(&args[0], &option)) |
| return 0; |
| sbi->s_resuid = option; |
| break; |
| case Opt_resgid: |
| if (match_int(&args[0], &option)) |
| return 0; |
| sbi->s_resgid = option; |
| break; |
| case Opt_sb: |
| /* handled by get_sb_block() instead of here */ |
| /* *sb_block = match_int(&args[0]); */ |
| break; |
| case Opt_err_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); |
| break; |
| case Opt_err_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); |
| break; |
| case Opt_err_cont: |
| clear_opt(sbi->s_mount_opt, ERRORS_RO); |
| clear_opt(sbi->s_mount_opt, ERRORS_PANIC); |
| set_opt(sbi->s_mount_opt, ERRORS_CONT); |
| break; |
| case Opt_nouid32: |
| set_opt(sbi->s_mount_opt, NO_UID32); |
| break; |
| case Opt_nocheck: |
| clear_opt(sbi->s_mount_opt, CHECK); |
| break; |
| case Opt_debug: |
| set_opt(sbi->s_mount_opt, DEBUG); |
| break; |
| case Opt_oldalloc: |
| set_opt(sbi->s_mount_opt, OLDALLOC); |
| break; |
| case Opt_orlov: |
| clear_opt(sbi->s_mount_opt, OLDALLOC); |
| break; |
| #ifdef CONFIG_EXT4_FS_XATTR |
| case Opt_user_xattr: |
| set_opt(sbi->s_mount_opt, XATTR_USER); |
| break; |
| case Opt_nouser_xattr: |
| clear_opt(sbi->s_mount_opt, XATTR_USER); |
| break; |
| #else |
| case Opt_user_xattr: |
| case Opt_nouser_xattr: |
| printk(KERN_ERR "EXT4 (no)user_xattr options " |
| "not supported\n"); |
| break; |
| #endif |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| case Opt_acl: |
| set_opt(sbi->s_mount_opt, POSIX_ACL); |
| break; |
| case Opt_noacl: |
| clear_opt(sbi->s_mount_opt, POSIX_ACL); |
| break; |
| #else |
| case Opt_acl: |
| case Opt_noacl: |
| printk(KERN_ERR "EXT4 (no)acl options " |
| "not supported\n"); |
| break; |
| #endif |
| case Opt_reservation: |
| set_opt(sbi->s_mount_opt, RESERVATION); |
| break; |
| case Opt_noreservation: |
| clear_opt(sbi->s_mount_opt, RESERVATION); |
| break; |
| case Opt_journal_update: |
| /* @@@ 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 "EXT4-fs: cannot specify " |
| "journal on remount\n"); |
| return 0; |
| } |
| set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); |
| break; |
| case Opt_journal_inum: |
| if (is_remount) { |
| printk(KERN_ERR "EXT4-fs: cannot specify " |
| "journal on remount\n"); |
| return 0; |
| } |
| if (match_int(&args[0], &option)) |
| return 0; |
| *inum = option; |
| break; |
| case Opt_journal_dev: |
| if (is_remount) { |
| printk(KERN_ERR "EXT4-fs: cannot specify " |
| "journal on remount\n"); |
| return 0; |
| } |
| if (match_int(&args[0], &option)) |
| return 0; |
| *journal_devnum = option; |
| break; |
| case Opt_journal_checksum: |
| set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); |
| break; |
| case Opt_journal_async_commit: |
| set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); |
| set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); |
| break; |
| case Opt_noload: |
| set_opt(sbi->s_mount_opt, NOLOAD); |
| break; |
| case Opt_commit: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| if (option == 0) |
| option = JBD2_DEFAULT_MAX_COMMIT_AGE; |
| sbi->s_commit_interval = HZ * option; |
| break; |
| case Opt_data_journal: |
| data_opt = EXT4_MOUNT_JOURNAL_DATA; |
| goto datacheck; |
| case Opt_data_ordered: |
| data_opt = EXT4_MOUNT_ORDERED_DATA; |
| goto datacheck; |
| case Opt_data_writeback: |
| data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
| datacheck: |
| if (is_remount) { |
| if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
| != data_opt) { |
| printk(KERN_ERR |
| "EXT4-fs: cannot change data " |
| "mode on remount\n"); |
| return 0; |
| } |
| } else { |
| sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
| sbi->s_mount_opt |= data_opt; |
| } |
| break; |
| case Opt_data_err_abort: |
| set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); |
| break; |
| case Opt_data_err_ignore: |
| clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); |
| break; |
| #ifdef CONFIG_QUOTA |
| case Opt_usrjquota: |
| qtype = USRQUOTA; |
| goto set_qf_name; |
| case Opt_grpjquota: |
| qtype = GRPQUOTA; |
| set_qf_name: |
| if ((sb_any_quota_enabled(sb) || |
| sb_any_quota_suspended(sb)) && |
| !sbi->s_qf_names[qtype]) { |
| printk(KERN_ERR |
| "EXT4-fs: Cannot change journaled " |
| "quota options when quota turned on.\n"); |
| return 0; |
| } |
| qname = match_strdup(&args[0]); |
| if (!qname) { |
| printk(KERN_ERR |
| "EXT4-fs: not enough memory for " |
| "storing quotafile name.\n"); |
| return 0; |
| } |
| if (sbi->s_qf_names[qtype] && |
| strcmp(sbi->s_qf_names[qtype], qname)) { |
| printk(KERN_ERR |
| "EXT4-fs: %s quota file already " |
| "specified.\n", QTYPE2NAME(qtype)); |
| kfree(qname); |
| return 0; |
| } |
| sbi->s_qf_names[qtype] = qname; |
| if (strchr(sbi->s_qf_names[qtype], '/')) { |
| printk(KERN_ERR |
| "EXT4-fs: quotafile must be on " |
| "filesystem root.\n"); |
| kfree(sbi->s_qf_names[qtype]); |
| sbi->s_qf_names[qtype] = NULL; |
| return 0; |
| } |
| set_opt(sbi->s_mount_opt, QUOTA); |
| break; |
| case Opt_offusrjquota: |
| qtype = USRQUOTA; |
| goto clear_qf_name; |
| case Opt_offgrpjquota: |
| qtype = GRPQUOTA; |
| clear_qf_name: |
| if ((sb_any_quota_enabled(sb) || |
| sb_any_quota_suspended(sb)) && |
| sbi->s_qf_names[qtype]) { |
| printk(KERN_ERR "EXT4-fs: Cannot change " |
| "journaled quota options when " |
| "quota turned on.\n"); |
| return 0; |
| } |
| /* |
| * The space will be released later when all options |
| * are confirmed to be correct |
| */ |
| sbi->s_qf_names[qtype] = NULL; |
| break; |
| case Opt_jqfmt_vfsold: |
| qfmt = QFMT_VFS_OLD; |
| goto set_qf_format; |
| case Opt_jqfmt_vfsv0: |
| qfmt = QFMT_VFS_V0; |
| set_qf_format: |
| if ((sb_any_quota_enabled(sb) || |
| sb_any_quota_suspended(sb)) && |
| sbi->s_jquota_fmt != qfmt) { |
| printk(KERN_ERR "EXT4-fs: Cannot change " |
| "journaled quota options when " |
| "quota turned on.\n"); |
| return 0; |
| } |
| sbi->s_jquota_fmt = qfmt; |
| break; |
| case Opt_quota: |
| case Opt_usrquota: |
| set_opt(sbi->s_mount_opt, QUOTA); |
| set_opt(sbi->s_mount_opt, USRQUOTA); |
| break; |
| case Opt_grpquota: |
| set_opt(sbi->s_mount_opt, QUOTA); |
| set_opt(sbi->s_mount_opt, GRPQUOTA); |
| break; |
| case Opt_noquota: |
| if (sb_any_quota_enabled(sb)) { |
| printk(KERN_ERR "EXT4-fs: Cannot change quota " |
| "options when quota turned on.\n"); |
| return 0; |
| } |
| clear_opt(sbi->s_mount_opt, QUOTA); |
| clear_opt(sbi->s_mount_opt, USRQUOTA); |
| clear_opt(sbi->s_mount_opt, GRPQUOTA); |
| break; |
| #else |
| case Opt_quota: |
| case Opt_usrquota: |
| case Opt_grpquota: |
| printk(KERN_ERR |
| "EXT4-fs: quota options not supported.\n"); |
| break; |
| case Opt_usrjquota: |
| case Opt_grpjquota: |
| case Opt_offusrjquota: |
| case Opt_offgrpjquota: |
| case Opt_jqfmt_vfsold: |
| case Opt_jqfmt_vfsv0: |
| printk(KERN_ERR |
| "EXT4-fs: journaled quota options not " |
| "supported.\n"); |
| break; |
| case Opt_noquota: |
| break; |
| #endif |
| case Opt_abort: |
| set_opt(sbi->s_mount_opt, ABORT); |
| break; |
| case Opt_barrier: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option) |
| set_opt(sbi->s_mount_opt, BARRIER); |
| else |
| clear_opt(sbi->s_mount_opt, BARRIER); |
| break; |
| case Opt_ignore: |
| break; |
| case Opt_resize: |
| if (!is_remount) { |
| printk("EXT4-fs: resize option only available " |
| "for remount\n"); |
| return 0; |
| } |
| if (match_int(&args[0], &option) != 0) |
| return 0; |
| *n_blocks_count = option; |
| break; |
| case Opt_nobh: |
| set_opt(sbi->s_mount_opt, NOBH); |
| break; |
| case Opt_bh: |
| clear_opt(sbi->s_mount_opt, NOBH); |
| break; |
| case Opt_extents: |
| if (!EXT4_HAS_INCOMPAT_FEATURE(sb, |
| EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
| ext4_warning(sb, __func__, |
| "extents feature not enabled " |
| "on this filesystem, use tune2fs\n"); |
| return 0; |
| } |
| set_opt(sbi->s_mount_opt, EXTENTS); |
| break; |
| case Opt_noextents: |
| /* |
| * When e2fsprogs support resizing an already existing |
| * ext3 file system to greater than 2**32 we need to |
| * add support to block allocator to handle growing |
| * already existing block mapped inode so that blocks |
| * allocated for them fall within 2**32 |
| */ |
| last_block = ext4_blocks_count(sbi->s_es) - 1; |
| if (last_block > 0xffffffffULL) { |
| printk(KERN_ERR "EXT4-fs: Filesystem too " |
| "large to mount with " |
| "-o noextents options\n"); |
| return 0; |
| } |
| clear_opt(sbi->s_mount_opt, EXTENTS); |
| break; |
| case Opt_i_version: |
| set_opt(sbi->s_mount_opt, I_VERSION); |
| sb->s_flags |= MS_I_VERSION; |
| break; |
| case Opt_nodelalloc: |
| clear_opt(sbi->s_mount_opt, DELALLOC); |
| break; |
| case Opt_stripe: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0) |
| return 0; |
| sbi->s_stripe = option; |
| break; |
| case Opt_delalloc: |
| set_opt(sbi->s_mount_opt, DELALLOC); |
| break; |
| case Opt_inode_readahead_blks: |
| if (match_int(&args[0], &option)) |
| return 0; |
| if (option < 0 || option > (1 << 30)) |
| return 0; |
| sbi->s_inode_readahead_blks = option; |
| break; |
| default: |
| printk(KERN_ERR |
| "EXT4-fs: Unrecognized mount option \"%s\" " |
| "or missing value\n", p); |
| return 0; |
| } |
| } |
| #ifdef CONFIG_QUOTA |
| if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
| if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
| sbi->s_qf_names[USRQUOTA]) |
| clear_opt(sbi->s_mount_opt, USRQUOTA); |
| |
| if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
| sbi->s_qf_names[GRPQUOTA]) |
| clear_opt(sbi->s_mount_opt, GRPQUOTA); |
| |
| if ((sbi->s_qf_names[USRQUOTA] && |
| (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
| (sbi->s_qf_names[GRPQUOTA] && |
| (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
| printk(KERN_ERR "EXT4-fs: old and new quota " |
| "format mixing.\n"); |
| return 0; |
| } |
| |
| if (!sbi->s_jquota_fmt) { |
| printk(KERN_ERR "EXT4-fs: journaled quota format " |
| "not specified.\n"); |
| return 0; |
| } |
| } else { |
| if (sbi->s_jquota_fmt) { |
| printk(KERN_ERR "EXT4-fs: journaled quota format " |
| "specified with no journaling " |
| "enabled.\n"); |
| return 0; |
| } |
| } |
| #endif |
| return 1; |
| } |
| |
| static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
| int read_only) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| int res = 0; |
| |
| if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
| printk(KERN_ERR "EXT4-fs warning: revision level too high, " |
| "forcing read-only mode\n"); |
| res = MS_RDONLY; |
| } |
| if (read_only) |
| return res; |
| if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
| printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " |
| "running e2fsck is recommended\n"); |
| else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
| printk(KERN_WARNING |
| "EXT4-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 |
| "EXT4-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 |
| "EXT4-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(~EXT4_VALID_FS); |
| #endif |
| if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) |
| es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
| le16_add_cpu(&es->s_mnt_count, 1); |
| es->s_mtime = cpu_to_le32(get_seconds()); |
| ext4_update_dynamic_rev(sb); |
| EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| |
| ext4_commit_super(sb, es, 1); |
| if (test_opt(sb, DEBUG)) |
| printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
| "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
| sb->s_blocksize, |
| sbi->s_groups_count, |
| EXT4_BLOCKS_PER_GROUP(sb), |
| EXT4_INODES_PER_GROUP(sb), |
| sbi->s_mount_opt); |
| |
| printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n", |
| sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" : |
| "external", EXT4_SB(sb)->s_journal->j_devname); |
| return res; |
| } |
| |
| static int ext4_fill_flex_info(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_group_desc *gdp = NULL; |
| struct buffer_head *bh; |
| ext4_group_t flex_group_count; |
| ext4_group_t flex_group; |
| int groups_per_flex = 0; |
| __u64 block_bitmap = 0; |
| int i; |
| |
| if (!sbi->s_es->s_log_groups_per_flex) { |
| sbi->s_log_groups_per_flex = 0; |
| return 1; |
| } |
| |
| sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; |
| groups_per_flex = 1 << sbi->s_log_groups_per_flex; |
| |
| /* We allocate both existing and potentially added groups */ |
| flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + |
| ((sbi->s_es->s_reserved_gdt_blocks +1 ) << |
| EXT4_DESC_PER_BLOCK_BITS(sb))) / |
| groups_per_flex; |
| sbi->s_flex_groups = kzalloc(flex_group_count * |
| sizeof(struct flex_groups), GFP_KERNEL); |
| if (sbi->s_flex_groups == NULL) { |
| printk(KERN_ERR "EXT4-fs: not enough memory for " |
| "%lu flex groups\n", flex_group_count); |
| goto failed; |
| } |
| |
| gdp = ext4_get_group_desc(sb, 1, &bh); |
| block_bitmap = ext4_block_bitmap(sb, gdp) - 1; |
| |
| for (i = 0; i < sbi->s_groups_count; i++) { |
| gdp = ext4_get_group_desc(sb, i, &bh); |
| |
| flex_group = ext4_flex_group(sbi, i); |
| sbi->s_flex_groups[flex_group].free_inodes += |
| le16_to_cpu(gdp->bg_free_inodes_count); |
| sbi->s_flex_groups[flex_group].free_blocks += |
| le16_to_cpu(gdp->bg_free_blocks_count); |
| } |
| |
| return 1; |
| failed: |
| return 0; |
| } |
| |
| __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| __u16 crc = 0; |
| |
| if (sbi->s_es->s_feature_ro_compat & |
| cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { |
| int offset = offsetof(struct ext4_group_desc, bg_checksum); |
| __le32 le_group = cpu_to_le32(block_group); |
| |
| crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); |
| crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); |
| crc = crc16(crc, (__u8 *)gdp, offset); |
| offset += sizeof(gdp->bg_checksum); /* skip checksum */ |
| /* for checksum of struct ext4_group_desc do the rest...*/ |
| if ((sbi->s_es->s_feature_incompat & |
| cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && |
| offset < le16_to_cpu(sbi->s_es->s_desc_size)) |
| crc = crc16(crc, (__u8 *)gdp + offset, |
| le16_to_cpu(sbi->s_es->s_desc_size) - |
| offset); |
| } |
| |
| return cpu_to_le16(crc); |
| } |
| |
| int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, |
| struct ext4_group_desc *gdp) |
| { |
| if ((sbi->s_es->s_feature_ro_compat & |
| cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && |
| (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* Called at mount-time, super-block is locked */ |
| static int ext4_check_descriptors(struct super_block *sb) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); |
| ext4_fsblk_t last_block; |
| ext4_fsblk_t block_bitmap; |
| ext4_fsblk_t inode_bitmap; |
| ext4_fsblk_t inode_table; |
| int flexbg_flag = 0; |
| ext4_group_t i; |
| |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
| flexbg_flag = 1; |
| |
| ext4_debug("Checking group descriptors"); |
| |
| for (i = 0; i < sbi->s_groups_count; i++) { |
| struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); |
| |
| if (i == sbi->s_groups_count - 1 || flexbg_flag) |
| last_block = ext4_blocks_count(sbi->s_es) - 1; |
| else |
| last_block = first_block + |
| (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
| |
| block_bitmap = ext4_block_bitmap(sb, gdp); |
| if (block_bitmap < first_block || block_bitmap > last_block) { |
| printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
| "Block bitmap for group %lu not in group " |
| "(block %llu)!", i, block_bitmap); |
| return 0; |
| } |
| inode_bitmap = ext4_inode_bitmap(sb, gdp); |
| if (inode_bitmap < first_block || inode_bitmap > last_block) { |
| printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
| "Inode bitmap for group %lu not in group " |
| "(block %llu)!", i, inode_bitmap); |
| return 0; |
| } |
| inode_table = ext4_inode_table(sb, gdp); |
| if (inode_table < first_block || |
| inode_table + sbi->s_itb_per_group - 1 > last_block) { |
| printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
| "Inode table for group %lu not in group " |
| "(block %llu)!", i, inode_table); |
| return 0; |
| } |
| spin_lock(sb_bgl_lock(sbi, i)); |
| if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { |
| printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
| "Checksum for group %lu failed (%u!=%u)\n", |
| i, le16_to_cpu(ext4_group_desc_csum(sbi, i, |
| gdp)), le16_to_cpu(gdp->bg_checksum)); |
| if (!(sb->s_flags & MS_RDONLY)) { |
| spin_unlock(sb_bgl_lock(sbi, i)); |
| return 0; |
| } |
| } |
| spin_unlock(sb_bgl_lock(sbi, i)); |
| if (!flexbg_flag) |
| first_block += EXT4_BLOCKS_PER_GROUP(sb); |
| } |
| |
| ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
| sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
| return 1; |
| } |
| |
| /* ext4_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 |
| * ext4_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 ext4_orphan_cleanup(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| unsigned int s_flags = sb->s_flags; |
| int nr_orphans = 0, nr_truncates = 0; |
| #ifdef CONFIG_QUOTA |
| int i; |
| #endif |
| if (!es->s_last_orphan) { |
| jbd_debug(4, "no orphan inodes to clean up\n"); |
| return; |
| } |
| |
| if (bdev_read_only(sb->s_bdev)) { |
| printk(KERN_ERR "EXT4-fs: write access " |
| "unavailable, skipping orphan cleanup.\n"); |
| return; |
| } |
| |
| if (EXT4_SB(sb)->s_mount_state & EXT4_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; |
| } |
| |
| if (s_flags & MS_RDONLY) { |
| printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
| sb->s_id); |
| sb->s_flags &= ~MS_RDONLY; |
| } |
| #ifdef CONFIG_QUOTA |
| /* Needed for iput() to work correctly and not trash data */ |
| sb->s_flags |= MS_ACTIVE; |
| /* Turn on quotas so that they are updated correctly */ |
| for (i = 0; i < MAXQUOTAS; i++) { |
| if (EXT4_SB(sb)->s_qf_names[i]) { |
| int ret = ext4_quota_on_mount(sb, i); |
| if (ret < 0) |
| printk(KERN_ERR |
| "EXT4-fs: Cannot turn on journaled " |
| "quota: error %d\n", ret); |
| } |
| } |
| #endif |
| |
| while (es->s_last_orphan) { |
| struct inode *inode; |
| |
| inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); |
| if (IS_ERR(inode)) { |
| es->s_last_orphan = 0; |
| break; |
| } |
| |
| list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
| DQUOT_INIT(inode); |
| if (inode->i_nlink) { |
| printk(KERN_DEBUG |
| "%s: truncating inode %lu to %lld bytes\n", |
| __func__, inode->i_ino, inode->i_size); |
| jbd_debug(2, "truncating inode %lu to %lld bytes\n", |
| inode->i_ino, inode->i_size); |
| ext4_truncate(inode); |
| nr_truncates++; |
| } else { |
| printk(KERN_DEBUG |
| "%s: deleting unreferenced inode %lu\n", |
| __func__, inode->i_ino); |
| jbd_debug(2, "deleting unreferenced inode %lu\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 "EXT4-fs: %s: %d orphan inode%s deleted\n", |
| sb->s_id, PLURAL(nr_orphans)); |
| if (nr_truncates) |
| printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
| sb->s_id, PLURAL(nr_truncates)); |
| #ifdef CONFIG_QUOTA |
| /* Turn quotas off */ |
| for (i = 0; i < MAXQUOTAS; i++) { |
| if (sb_dqopt(sb)->files[i]) |
| vfs_quota_off(sb, i, 0); |
| } |
| #endif |
| sb->s_flags = s_flags; /* Restore MS_RDONLY status */ |
| } |
| /* |
| * Maximal extent format file size. |
| * Resulting logical blkno at s_maxbytes must fit in our on-disk |
| * extent format containers, within a sector_t, and within i_blocks |
| * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, |
| * so that won't be a limiting factor. |
| * |
| * Note, this does *not* consider any metadata overhead for vfs i_blocks. |
| */ |
| static loff_t ext4_max_size(int blkbits) |
| { |
| loff_t res; |
| loff_t upper_limit = MAX_LFS_FILESIZE; |
| |
| /* small i_blocks in vfs inode? */ |
| if (sizeof(blkcnt_t) < sizeof(u64)) { |
| /* |
| * CONFIG_LSF is not enabled implies the inode |
| * i_block represent total blocks in 512 bytes |
| * 32 == size of vfs inode i_blocks * 8 |
| */ |
| upper_limit = (1LL << 32) - 1; |
| |
| /* total blocks in file system block size */ |
| upper_limit >>= (blkbits - 9); |
| upper_limit <<= blkbits; |
| } |
| |
| /* 32-bit extent-start container, ee_block */ |
| res = 1LL << 32; |
| res <<= blkbits; |
| res -= 1; |
| |
| /* Sanity check against vm- & vfs- imposed limits */ |
| if (res > upper_limit) |
| res = upper_limit; |
| |
| return res; |
| } |
| |
| /* |
| * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect |
| * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. |
| * We need to be 1 filesystem block less than the 2^48 sector limit. |
| */ |
| static loff_t ext4_max_bitmap_size(int bits) |
| { |
| loff_t res = EXT4_NDIR_BLOCKS; |
| int meta_blocks; |
| loff_t upper_limit; |
| /* This is calculated to be the largest file size for a |
| * dense, bitmapped file such that the total number of |
| * sectors in the file, including data and all indirect blocks, |
| * does not exceed 2^48 -1 |
| * __u32 i_blocks_lo and _u16 i_blocks_high representing the |
| * total number of 512 bytes blocks of the file |
| */ |
| |
| if (sizeof(blkcnt_t) < sizeof(u64)) { |
| /* |
| * CONFIG_LSF is not enabled implies the inode |
| * i_block represent total blocks in 512 bytes |
| * 32 == size of vfs inode i_blocks * 8 |
| */ |
| upper_limit = (1LL << 32) - 1; |
| |
| /* total blocks in file system block size */ |
| upper_limit >>= (bits - 9); |
| |
| } else { |
| /* |
| * We use 48 bit ext4_inode i_blocks |
| * With EXT4_HUGE_FILE_FL set the i_blocks |
| * represent total number of blocks in |
| * file system block size |
| */ |
| upper_limit = (1LL << 48) - 1; |
| |
| } |
| |
| /* indirect blocks */ |
| meta_blocks = 1; |
| /* double indirect blocks */ |
| meta_blocks += 1 + (1LL << (bits-2)); |
| /* tripple indirect blocks */ |
| meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
| |
| upper_limit -= meta_blocks; |
| upper_limit <<= bits; |
| |
| res += 1LL << (bits-2); |
| res += 1LL << (2*(bits-2)); |
| res += 1LL << (3*(bits-2)); |
| res <<= bits; |
| if (res > upper_limit) |
| res = upper_limit; |
| |
| if (res > MAX_LFS_FILESIZE) |
| res = MAX_LFS_FILESIZE; |
| |
| return res; |
| } |
| |
| static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
| ext4_fsblk_t logical_sb_block, int nr) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_group_t bg, first_meta_bg; |
| int has_super = 0; |
| |
| first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| |
| if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
| nr < first_meta_bg) |
| return logical_sb_block + nr + 1; |
| bg = sbi->s_desc_per_block * nr; |
| if (ext4_bg_has_super(sb, bg)) |
| has_super = 1; |
| return (has_super + ext4_group_first_block_no(sb, bg)); |
| } |
| |
| /** |
| * ext4_get_stripe_size: Get the stripe size. |
| * @sbi: In memory super block info |
| * |
| * If we have specified it via mount option, then |
| * use the mount option value. If the value specified at mount time is |
| * greater than the blocks per group use the super block value. |
| * If the super block value is greater than blocks per group return 0. |
| * Allocator needs it be less than blocks per group. |
| * |
| */ |
| static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) |
| { |
| unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); |
| unsigned long stripe_width = |
| le32_to_cpu(sbi->s_es->s_raid_stripe_width); |
| |
| if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) |
| return sbi->s_stripe; |
| |
| if (stripe_width <= sbi->s_blocks_per_group) |
| return stripe_width; |
| |
| if (stride <= sbi->s_blocks_per_group) |
| return stride; |
| |
| return 0; |
| } |
| |
| static int ext4_fill_super(struct super_block *sb, void *data, int silent) |
| __releases(kernel_lock) |
| __acquires(kernel_lock) |
| |
| { |
| struct buffer_head *bh; |
| struct ext4_super_block *es = NULL; |
| struct ext4_sb_info *sbi; |
| ext4_fsblk_t block; |
| ext4_fsblk_t sb_block = get_sb_block(&data); |
| ext4_fsblk_t logical_sb_block; |
| unsigned long offset = 0; |
| unsigned int journal_inum = 0; |
| unsigned long journal_devnum = 0; |
| unsigned long def_mount_opts; |
| struct inode *root; |
| char *cp; |
| int ret = -EINVAL; |
| int blocksize; |
| int db_count; |
| int i; |
| int needs_recovery; |
| __le32 features; |
| __u64 blocks_count; |
| int err; |
| |
| sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| if (!sbi) |
| return -ENOMEM; |
| sb->s_fs_info = sbi; |
| sbi->s_mount_opt = 0; |
| sbi->s_resuid = EXT4_DEF_RESUID; |
| sbi->s_resgid = EXT4_DEF_RESGID; |
| sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; |
| sbi->s_sb_block = sb_block; |
| |
| unlock_kernel(); |
| |
| /* Cleanup superblock name */ |
| for (cp = sb->s_id; (cp = strchr(cp, '/'));) |
| *cp = '!'; |
| |
| blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
| if (!blocksize) { |
| printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
| goto out_fail; |
| } |
| |
| /* |
| * The ext4 superblock will not be buffer aligned for other than 1kB |
| * block sizes. We need to calculate the offset from buffer start. |
| */ |
| if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
| logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
| offset = do_div(logical_sb_block, blocksize); |
| } else { |
| logical_sb_block = sb_block; |
| } |
| |
| if (!(bh = sb_bread(sb, logical_sb_block))) { |
| printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); |
| goto out_fail; |
| } |
| /* |
| * Note: s_es must be initialized as soon as possible because |
| * some ext4 macro-instructions depend on its value |
| */ |
| es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
| sbi->s_es = es; |
| sb->s_magic = le16_to_cpu(es->s_magic); |
| if (sb->s_magic != EXT4_SUPER_MAGIC) |
| goto cantfind_ext4; |
| |
| /* Set defaults before we parse the mount options */ |
| def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| if (def_mount_opts & EXT4_DEFM_DEBUG) |
| set_opt(sbi->s_mount_opt, DEBUG); |
| if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
| set_opt(sbi->s_mount_opt, GRPID); |
| if (def_mount_opts & EXT4_DEFM_UID16) |
| set_opt(sbi->s_mount_opt, NO_UID32); |
| #ifdef CONFIG_EXT4_FS_XATTR |
| if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
| set_opt(sbi->s_mount_opt, XATTR_USER); |
| #endif |
| #ifdef CONFIG_EXT4_FS_POSIX_ACL |
| if (def_mount_opts & EXT4_DEFM_ACL) |
| set_opt(sbi->s_mount_opt, POSIX_ACL); |
| #endif |
| if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
| sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; |
| else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) |
| sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; |
| else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) |
| sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; |
| |
| if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) |
| set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
| else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) |
| set_opt(sbi->s_mount_opt, ERRORS_CONT); |
| else |
| 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); |
| |
| set_opt(sbi->s_mount_opt, RESERVATION); |
| set_opt(sbi->s_mount_opt, BARRIER); |
| |
| /* |
| * turn on extents feature by default in ext4 filesystem |
| * only if feature flag already set by mkfs or tune2fs. |
| * Use -o noextents to turn it off |
| */ |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) |
| set_opt(sbi->s_mount_opt, EXTENTS); |
| else |
| ext4_warning(sb, __func__, |
| "extents feature not enabled on this filesystem, " |
| "use tune2fs.\n"); |
| |
| /* |
| * enable delayed allocation by default |
| * Use -o nodelalloc to turn it off |
| */ |
| set_opt(sbi->s_mount_opt, DELALLOC); |
| |
| |
| if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum, |
| NULL, 0)) |
| goto failed_mount; |
| |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| |
| if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
| (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || |
| EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
| EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
| printk(KERN_WARNING |
| "EXT4-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. |
| */ |
| features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
| if (features) { |
| printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
| "unsupported optional features (%x).\n", |
| sb->s_id, le32_to_cpu(features)); |
| goto failed_mount; |
| } |
| features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
| if (!(sb->s_flags & MS_RDONLY) && features) { |
| printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
| "unsupported optional features (%x).\n", |
| sb->s_id, le32_to_cpu(features)); |
| goto failed_mount; |
| } |
| if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { |
| /* |
| * Large file size enabled file system can only be |
| * mount if kernel is build with CONFIG_LSF |
| */ |
| if (sizeof(root->i_blocks) < sizeof(u64) && |
| !(sb->s_flags & MS_RDONLY)) { |
| printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " |
| "files cannot be mounted read-write " |
| "without CONFIG_LSF.\n", sb->s_id); |
| goto failed_mount; |
| } |
| } |
| blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
| |
| if (blocksize < EXT4_MIN_BLOCK_SIZE || |
| blocksize > EXT4_MAX_BLOCK_SIZE) { |
| printk(KERN_ERR |
| "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
| blocksize, sb->s_id); |
| goto failed_mount; |
| } |
| |
| if (sb->s_blocksize != blocksize) { |
| |
| /* Validate the filesystem blocksize */ |
| if (!sb_set_blocksize(sb, blocksize)) { |
| printk(KERN_ERR "EXT4-fs: bad block size %d.\n", |
| blocksize); |
| goto failed_mount; |
| } |
| |
| brelse(bh); |
| logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
| offset = do_div(logical_sb_block, blocksize); |
| bh = sb_bread(sb, logical_sb_block); |
| if (!bh) { |
| printk(KERN_ERR |
| "EXT4-fs: Can't read superblock on 2nd try.\n"); |
| goto failed_mount; |
| } |
| es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
| sbi->s_es = es; |
| if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
| printk(KERN_ERR |
| "EXT4-fs: Magic mismatch, very weird !\n"); |
| goto failed_mount; |
| } |
| } |
| |
| sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); |
| sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
| |
| if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
| sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; |
| sbi->s_first_ino = EXT4_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 < EXT4_GOOD_OLD_INODE_SIZE) || |
| (!is_power_of_2(sbi->s_inode_size)) || |
| (sbi->s_inode_size > blocksize)) { |
| printk(KERN_ERR |
| "EXT4-fs: unsupported inode size: %d\n", |
| sbi->s_inode_size); |
| goto failed_mount; |
| } |
| if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
| sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); |
| } |
| sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { |
| if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
| sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
| !is_power_of_2(sbi->s_desc_size)) { |
| printk(KERN_ERR |
| "EXT4-fs: unsupported descriptor size %lu\n", |
| sbi->s_desc_size); |
| goto failed_mount; |
| } |
| } else |
| sbi->s_desc_size = EXT4_MIN_DESC_SIZE; |
| sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) |
| goto cantfind_ext4; |
| sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); |
| if (sbi->s_inodes_per_block == 0) |
| goto cantfind_ext4; |
| sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| sbi->s_inodes_per_block; |
| sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
| sbi->s_sbh = bh; |
| sbi->s_mount_state = le16_to_cpu(es->s_state); |
| sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
| sbi->s_desc_per_block_bits = ilog2(EXT4_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 |
| "EXT4-fs: #blocks per group too big: %lu\n", |
| sbi->s_blocks_per_group); |
| goto failed_mount; |
| } |
| if (sbi->s_inodes_per_group > blocksize * 8) { |
| printk(KERN_ERR |
| "EXT4-fs: #inodes per group too big: %lu\n", |
| sbi->s_inodes_per_group); |
| goto failed_mount; |
| } |
| |
| if (ext4_blocks_count(es) > |
| (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
| printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
| " too large to mount safely\n", sb->s_id); |
| if (sizeof(sector_t) < 8) |
| printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
| "enabled\n"); |
| goto failed_mount; |
| } |
| |
| if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
| goto cantfind_ext4; |
| |
| /* ensure blocks_count calculation below doesn't sign-extend */ |
| if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < |
| le32_to_cpu(es->s_first_data_block) + 1) { |
| printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " |
| "first data block %u, blocks per group %lu\n", |
| ext4_blocks_count(es), |
| le32_to_cpu(es->s_first_data_block), |
| EXT4_BLOCKS_PER_GROUP(sb)); |
| goto failed_mount; |
| } |
| blocks_count = (ext4_blocks_count(es) - |
| le32_to_cpu(es->s_first_data_block) + |
| EXT4_BLOCKS_PER_GROUP(sb) - 1); |
| do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); |
| sbi->s_groups_count = blocks_count; |
| db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
| EXT4_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 "EXT4-fs: not enough memory\n"); |
| goto failed_mount; |
| } |
| |
| if (ext4_proc_root) |
| sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); |
| |
| if (sbi->s_proc) |
| proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, |
| &ext4_ui_proc_fops, |
| &sbi->s_inode_readahead_blks); |
| |
| bgl_lock_init(&sbi->s_blockgroup_lock); |
| |
| for (i = 0; i < db_count; i++) { |
| block = descriptor_loc(sb, logical_sb_block, i); |
| sbi->s_group_desc[i] = sb_bread(sb, block); |
| if (!sbi->s_group_desc[i]) { |
| printk(KERN_ERR "EXT4-fs: " |
| "can't read group descriptor %d\n", i); |
| db_count = i; |
| goto failed_mount2; |
| } |
| } |
| if (!ext4_check_descriptors(sb)) { |
| printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); |
| goto failed_mount2; |
| } |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
| if (!ext4_fill_flex_info(sb)) { |
| printk(KERN_ERR |
| "EXT4-fs: unable to initialize " |
| "flex_bg meta info!\n"); |
| goto failed_mount2; |
| } |
| |
| sbi->s_gdb_count = db_count; |
| get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| spin_lock_init(&sbi->s_next_gen_lock); |
| |
| err = percpu_counter_init(&sbi->s_freeblocks_counter, |
| ext4_count_free_blocks(sb)); |
| if (!err) { |
| err = percpu_counter_init(&sbi->s_freeinodes_counter, |
| ext4_count_free_inodes(sb)); |
| } |
| if (!err) { |
| err = percpu_counter_init(&sbi->s_dirs_counter, |
| ext4_count_dirs(sb)); |
| } |
| if (!err) { |
| err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); |
| } |
| if (err) { |
| printk(KERN_ERR "EXT4-fs: insufficient memory\n"); |
| goto failed_mount3; |
| } |
| |
| sbi->s_stripe = ext4_get_stripe_size(sbi); |
| |
| /* |
| * set up enough so that it can read an inode |
| */ |
| sb->s_op = &ext4_sops; |
| sb->s_export_op = &ext4_export_ops; |
| sb->s_xattr = ext4_xattr_handlers; |
| #ifdef CONFIG_QUOTA |
| sb->s_qcop = &ext4_qctl_operations; |
| sb->dq_op = &ext4_quota_operations; |
| #endif |
| INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ |
| |
| sb->s_root = NULL; |
| |
| needs_recovery = (es->s_last_orphan != 0 || |
| EXT4_HAS_INCOMPAT_FEATURE(sb, |
| EXT4_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) && |
| EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
| if (ext4_load_journal(sb, es, journal_devnum)) |
| goto failed_mount3; |
| if (!(sb->s_flags & MS_RDONLY) && |
| EXT4_SB(sb)->s_journal->j_failed_commit) { |
| printk(KERN_CRIT "EXT4-fs error (device %s): " |
| "ext4_fill_super: Journal transaction " |
| "%u is corrupt\n", sb->s_id, |
| EXT4_SB(sb)->s_journal->j_failed_commit); |
| if (test_opt(sb, ERRORS_RO)) { |
| printk(KERN_CRIT |
| "Mounting filesystem read-only\n"); |
| sb->s_flags |= MS_RDONLY; |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| } |
| if (test_opt(sb, ERRORS_PANIC)) { |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| ext4_commit_super(sb, es, 1); |
| printk(KERN_CRIT |
| "EXT4-fs (device %s): mount failed\n", |
| sb->s_id); |
| goto failed_mount4; |
| } |
| } |
| } else if (journal_inum) { |
| if (ext4_create_journal(sb, es, journal_inum)) |
| goto failed_mount3; |
| } else { |
| if (!silent) |
| printk(KERN_ERR |
| "ext4: No journal on filesystem on %s\n", |
| sb->s_id); |
| goto failed_mount3; |
| } |
| |
| if (ext4_blocks_count(es) > 0xffffffffULL && |
| !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, |
| JBD2_FEATURE_INCOMPAT_64BIT)) { |
| printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); |
| goto failed_mount4; |
| } |
| |
| if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { |
| jbd2_journal_set_features(sbi->s_journal, |
| JBD2_FEATURE_COMPAT_CHECKSUM, 0, |
| JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); |
| } else if (test_opt(sb, JOURNAL_CHECKSUM)) { |
| jbd2_journal_set_features(sbi->s_journal, |
| JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); |
| jbd2_journal_clear_features(sbi->s_journal, 0, 0, |
| JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); |
| } else { |
| jbd2_journal_clear_features(sbi->s_journal, |
| JBD2_FEATURE_COMPAT_CHECKSUM, 0, |
| JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); |
| } |
| |
| /* 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 (jbd2_journal_check_available_features |
| (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) |
| set_opt(sbi->s_mount_opt, ORDERED_DATA); |
| else |
| set_opt(sbi->s_mount_opt, JOURNAL_DATA); |
| break; |
| |
| case EXT4_MOUNT_ORDERED_DATA: |
| case EXT4_MOUNT_WRITEBACK_DATA: |
| if (!jbd2_journal_check_available_features |
| (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { |
| printk(KERN_ERR "EXT4-fs: Journal does not support " |
| "requested data journaling mode\n"); |
| goto failed_mount4; |
| } |
| default: |
| break; |
| } |
| |
| if (test_opt(sb, NOBH)) { |
| if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
| printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " |
| "its supported only with writeback mode\n"); |
| clear_opt(sbi->s_mount_opt, NOBH); |
| } |
| } |
| /* |
| * The jbd2_journal_load will have done any necessary log recovery, |
| * so we can safely mount the rest of the filesystem now. |
| */ |
| |
| root = ext4_iget(sb, EXT4_ROOT_INO); |
| if (IS_ERR(root)) { |
| printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
| ret = PTR_ERR(root); |
| goto failed_mount4; |
| } |
| if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| iput(root); |
| printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
| goto failed_mount4; |
| } |
| sb->s_root = d_alloc_root(root); |
| if (!sb->s_root) { |
| printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); |
| iput(root); |
| ret = -ENOMEM; |
| goto failed_mount4; |
| } |
| |
| ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); |
| |
| /* determine the minimum size of new large inodes, if present */ |
| if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { |
| sbi->s_want_extra_isize = sizeof(struct ext4_inode) - |
| EXT4_GOOD_OLD_INODE_SIZE; |
| if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { |
| if (sbi->s_want_extra_isize < |
| le16_to_cpu(es->s_want_extra_isize)) |
| sbi->s_want_extra_isize = |
| le16_to_cpu(es->s_want_extra_isize); |
| if (sbi->s_want_extra_isize < |
| le16_to_cpu(es->s_min_extra_isize)) |
| sbi->s_want_extra_isize = |
| le16_to_cpu(es->s_min_extra_isize); |
| } |
| } |
| /* Check if enough inode space is available */ |
| if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > |
| sbi->s_inode_size) { |
| sbi->s_want_extra_isize = sizeof(struct ext4_inode) - |
| EXT4_GOOD_OLD_INODE_SIZE; |
| printk(KERN_INFO "EXT4-fs: required extra inode space not" |
| "available.\n"); |
| } |
| |
| /* |
| * 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. |
| */ |
| EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
| ext4_orphan_cleanup(sb, es); |
| EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; |
| if (needs_recovery) |
| printk(KERN_INFO "EXT4-fs: recovery complete.\n"); |
| ext4_mark_recovery_complete(sb, es); |
| printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", |
| test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": |
| test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": |
| "writeback"); |
| |
| if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { |
| printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " |
| "requested data journaling mode\n"); |
| clear_opt(sbi->s_mount_opt, DELALLOC); |
| } else if (test_opt(sb, DELALLOC)) |
| printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); |
| |
| ext4_ext_init(sb); |
| err = ext4_mb_init(sb, needs_recovery); |
| if (err) { |
| printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n", |
| err); |
| goto failed_mount4; |
| } |
| |
| lock_kernel(); |
| return 0; |
| |
| cantfind_ext4: |
| if (!silent) |
| printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
| sb->s_id); |
| goto failed_mount; |
| |
| failed_mount4: |
| jbd2_journal_destroy(sbi->s_journal); |
| sbi->s_journal = NULL; |
| failed_mount3: |
| percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| percpu_counter_destroy(&sbi->s_dirs_counter); |
| percpu_counter_destroy(&sbi->s_dirtyblocks_counter); |
| failed_mount2: |
| for (i = 0; i < db_count; i++) |
| brelse(sbi->s_group_desc[i]); |
| kfree(sbi->s_group_desc); |
| failed_mount: |
| if (sbi->s_proc) { |
| remove_proc_entry("inode_readahead_blks", sbi->s_proc); |
| remove_proc_entry(sb->s_id, ext4_proc_root); |
| } |
| #ifdef CONFIG_QUOTA |
| for (i = 0; i < MAXQUOTAS; i++) |
| kfree(sbi->s_qf_names[i]); |
| #endif |
| ext4_blkdev_remove(sbi); |
| brelse(bh); |
| out_fail: |
| sb->s_fs_info = NULL; |
| kfree(sbi); |
| lock_kernel(); |
| return ret; |
| } |
| |
| /* |
| * 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 ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
| { |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| |
| if (sbi->s_commit_interval) |
| journal->j_commit_interval = sbi->s_commit_interval; |
| /* We could also set up an ext4-specific default for the commit |
| * interval here, but for now we'll just fall back to the jbd |
| * default. */ |
| |
| spin_lock(&journal->j_state_lock); |
| if (test_opt(sb, BARRIER)) |
| journal->j_flags |= JBD2_BARRIER; |
| else |
| journal->j_flags &= ~JBD2_BARRIER; |
| if (test_opt(sb, DATA_ERR_ABORT)) |
| journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; |
| else |
| journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; |
| spin_unlock(&journal->j_state_lock); |
| } |
| |
| static journal_t *ext4_get_journal(struct super_block *sb, |
| unsigned 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 = ext4_iget(sb, journal_inum); |
| if (IS_ERR(journal_inode)) { |
| printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
| return NULL; |
| } |
| if (!journal_inode->i_nlink) { |
| make_bad_inode(journal_inode); |
| iput(journal_inode); |
| printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
| return NULL; |
| } |
| |
| jbd_debug(2, "Journal inode found at %p: %lld bytes\n", |
| journal_inode, journal_inode->i_size); |
| if (!S_ISREG(journal_inode->i_mode)) { |
| printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
| iput(journal_inode); |
| return NULL; |
| } |
| |
| journal = jbd2_journal_init_inode(journal_inode); |
| if (!journal) { |
| printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
| iput(journal_inode); |
| return NULL; |
| } |
| journal->j_private = sb; |
| ext4_init_journal_params(sb, journal); |
| return journal; |
| } |
| |
| static journal_t *ext4_get_dev_journal(struct super_block *sb, |
| dev_t j_dev) |
| { |
| struct buffer_head *bh; |
| journal_t *journal; |
| ext4_fsblk_t start; |
| ext4_fsblk_t len; |
| int hblock, blocksize; |
| ext4_fsblk_t sb_block; |
| unsigned long offset; |
| struct ext4_super_block *es; |
| struct block_device *bdev; |
| |
| bdev = ext4_blkdev_get(j_dev); |
| if (bdev == NULL) |
| return NULL; |
| |
| if (bd_claim(bdev, sb)) { |
| printk(KERN_ERR |
| "EXT4: failed to claim external journal device.\n"); |
| blkdev_put(bdev); |
| return NULL; |
| } |
| |
| blocksize = sb->s_blocksize; |
| hblock = bdev_hardsect_size(bdev); |
| if (blocksize < hblock) { |
| printk(KERN_ERR |
| "EXT4-fs: blocksize too small for journal device.\n"); |
| goto out_bdev; |
| } |
| |
| sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
| offset = EXT4_MIN_BLOCK_SIZE % blocksize; |
| set_blocksize(bdev, blocksize); |
| if (!(bh = __bread(bdev, sb_block, blocksize))) { |
| printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
| "external journal\n"); |
| goto out_bdev; |
| } |
| |
| es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
| if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || |
| !(le32_to_cpu(es->s_feature_incompat) & |
| EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
| printk(KERN_ERR "EXT4-fs: external journal has " |
| "bad superblock\n"); |
| brelse(bh); |
| goto out_bdev; |
| } |
| |
| if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
| printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); |
| brelse(bh); |
| goto out_bdev; |
| } |
| |
| len = ext4_blocks_count(es); |
| start = sb_block + 1; |
| brelse(bh); /* we're done with the superblock */ |
| |
| journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
| start, len, blocksize); |
| if (!journal) { |
| printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
| goto out_bdev; |
| } |
| journal->j_private = sb; |
| 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 "EXT4-fs: I/O error on journal device\n"); |
| goto out_journal; |
| } |
| if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { |
| printk(KERN_ERR "EXT4-fs: External journal has more than one " |
| "user (unsupported) - %d\n", |
| be32_to_cpu(journal->j_superblock->s_nr_users)); |
| goto out_journal; |
| } |
| EXT4_SB(sb)->journal_bdev = bdev; |
| ext4_init_journal_params(sb, journal); |
| return journal; |
| out_journal: |
| jbd2_journal_destroy(journal); |
| out_bdev: |
| ext4_blkdev_put(bdev); |
| return NULL; |
| } |
| |
| static int ext4_load_journal(struct super_block *sb, |
| struct ext4_super_block *es, |
| unsigned long journal_devnum) |
| { |
| journal_t *journal; |
| unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); |
| dev_t journal_dev; |
| int err = 0; |
| int really_read_only; |
| |
| if (journal_devnum && |
| journal_devnum != le32_to_cpu(es->s_journal_dev)) { |
| printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
| "numbers have changed\n"); |
| journal_dev = new_decode_dev(journal_devnum); |
| } else |
| journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); |
| |
| 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 (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
| if (sb->s_flags & MS_RDONLY) { |
| printk(KERN_INFO "EXT4-fs: INFO: recovery " |
| "required on readonly filesystem.\n"); |
| if (really_read_only) { |
| printk(KERN_ERR "EXT4-fs: write access " |
| "unavailable, cannot proceed.\n"); |
| return -EROFS; |
| } |
| printk(KERN_INFO "EXT4-fs: write access will " |
| "be enabled during recovery.\n"); |
| } |
| } |
| |
| if (journal_inum && journal_dev) { |
| printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
| "and inode journals!\n"); |
| return -EINVAL; |
| } |
| |
| if (journal_inum) { |
| if (!(journal = ext4_get_journal(sb, journal_inum))) |
| return -EINVAL; |
| } else { |
| if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
| return -EINVAL; |
| } |
| |
| if (journal->j_flags & JBD2_BARRIER) |
| printk(KERN_INFO "EXT4-fs: barriers enabled\n"); |
| else |
| printk(KERN_INFO "EXT4-fs: barriers disabled\n"); |
| |
| if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { |
| err = jbd2_journal_update_format(journal); |
| if (err) { |
| printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
| jbd2_journal_destroy(journal); |
| return err; |
| } |
| } |
| |
| if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
| err = jbd2_journal_wipe(journal, !really_read_only); |
| if (!err) |
| err = jbd2_journal_load(journal); |
| |
| if (err) { |
| printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
| jbd2_journal_destroy(journal); |
| return err; |
| } |
| |
| EXT4_SB(sb)->s_journal = journal; |
| ext4_clear_journal_err(sb, es); |
| |
| if (journal_devnum && |
| journal_devnum != le32_to_cpu(es->s_journal_dev)) { |
| es->s_journal_dev = cpu_to_le32(journal_devnum); |
| sb->s_dirt = 1; |
| |
| /* Make sure we flush the recovery flag to disk. */ |
| ext4_commit_super(sb, es, 1); |
| } |
| |
| return 0; |
| } |
| |
| static int ext4_create_journal(struct super_block *sb, |
| struct ext4_super_block *es, |
| unsigned int journal_inum) |
| { |
| journal_t *journal; |
| int err; |
| |
| if (sb->s_flags & MS_RDONLY) { |
| printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
| "create journal.\n"); |
| return -EROFS; |
| } |
| |
| journal = ext4_get_journal(sb, journal_inum); |
| if (!journal) |
| return -EINVAL; |
| |
| printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
| journal_inum); |
| |
| err = jbd2_journal_create(journal); |
| if (err) { |
| printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
| jbd2_journal_destroy(journal); |
| return -EIO; |
| } |
| |
| EXT4_SB(sb)->s_journal = journal; |
| |
| ext4_update_dynamic_rev(sb); |
| EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| EXT4_SET_COMPAT_FEATURE(sb, EXT4_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. */ |
| ext4_commit_super(sb, es, 1); |
| |
| return 0; |
| } |
| |
| static void ext4_commit_super(struct super_block *sb, |
| struct ext4_super_block *es, int sync) |
| { |
| struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
| |
| if (!sbh) |
| return; |
| if (buffer_write_io_error(sbh)) { |
| /* |
| * Oh, dear. A previous attempt to write the |
| * superblock failed. This could happen because the |
| * USB device was yanked out. Or it could happen to |
| * be a transient write error and maybe the block will |
| * be remapped. Nothing we can do but to retry the |
| * write and hope for the best. |
| */ |
| printk(KERN_ERR "ext4: previous I/O error to " |
| "superblock detected for %s.\n", sb->s_id); |
| clear_buffer_write_io_error(sbh); |
| set_buffer_uptodate(sbh); |
| } |
| es->s_wtime = cpu_to_le32(get_seconds()); |
| ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); |
| es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
| BUFFER_TRACE(sbh, "marking dirty"); |
| mark_buffer_dirty(sbh); |
| if (sync) { |
| sync_dirty_buffer(sbh); |
| if (buffer_write_io_error(sbh)) { |
| printk(KERN_ERR "ext4: I/O error while writing " |
| "superblock for %s.\n", sb->s_id); |
| clear_buffer_write_io_error(sbh); |
| set_buffer_uptodate(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 ext4_mark_recovery_complete(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| jbd2_journal_lock_updates(journal); |
| if (jbd2_journal_flush(journal) < 0) |
| goto out; |
| |
| lock_super(sb); |
| if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
| sb->s_flags & MS_RDONLY) { |
| EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| sb->s_dirt = 0; |
| ext4_commit_super(sb, es, 1); |
| } |
| unlock_super(sb); |
| |
| out: |
| jbd2_journal_unlock_updates(journal); |
| } |
| |
| /* |
| * 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 ext4_clear_journal_err(struct super_block *sb, |
| struct ext4_super_block *es) |
| { |
| journal_t *journal; |
| int j_errno; |
| const char *errstr; |
| |
| journal = EXT4_SB(sb)->s_journal; |
| |
| /* |
| * Now check for any error status which may have been recorded in the |
| * journal by a prior ext4_error() or ext4_abort() |
| */ |
| |
| j_errno = jbd2_journal_errno(journal); |
| if (j_errno) { |
| char nbuf[16]; |
| |
| errstr = ext4_decode_error(sb, j_errno, nbuf); |
| ext4_warning(sb, __func__, "Filesystem error recorded " |
| "from previous mount: %s", errstr); |
| ext4_warning(sb, __func__, "Marking fs in need of " |
| "filesystem check."); |
| |
| EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
| es->s_state |= cpu_to_le16(EXT4_ERROR_FS); |
| ext4_commit_super(sb, es, 1); |
| |
| jbd2_journal_clear_err(journal); |
| } |
| } |
| |
| /* |
| * Force the running and committing transactions to commit, |
| * and wait on the commit. |
| */ |
| int ext4_force_commit(struct super_block *sb) |
| { |
| journal_t *journal; |
| int ret; |
| |
| if (sb->s_flags & MS_RDONLY) |
| return 0; |
| |
| journal = EXT4_SB(sb)->s_journal; |
| sb->s_dirt = 0; |
| ret = ext4_journal_force_commit(journal); |
| return ret; |
| } |
| |
| /* |
| * Ext4 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 void ext4_write_super(struct super_block *sb) |
| { |
| if (mutex_trylock(&sb->s_lock) != 0) |
| BUG(); |
| sb->s_dirt = 0; |
| } |
| |
| static int ext4_sync_fs(struct super_block *sb, int wait) |
| { |
| tid_t target; |
| |
| trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait); |
| sb->s_dirt = 0; |
| if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
| if (wait) |
| jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
| } |
| 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. |
| */ |
| static void ext4_write_super_lockfs(struct super_block *sb) |
| { |
| sb->s_dirt = 0; |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| journal_t *journal = EXT4_SB(sb)->s_journal; |
| |
| /* Now we set up the journal barrier. */ |
| jbd2_journal_lock_updates(journal); |
| |
| /* |
| * We don't want to clear needs_recovery flag when we failed |
| * to flush the journal. |
| */ |
| if (jbd2_journal_flush(journal) < 0) |
| return; |
| |
| /* Journal blocked and flushed, clear needs_recovery flag. */ |
| EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); |
| } |
| } |
| |
| /* |
| * 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. |
| */ |
| static void ext4_unlockfs(struct super_block *sb) |
| { |
| if (!(sb->s_flags & MS_RDONLY)) { |
| lock_super(sb); |
| /* Reser the needs_recovery flag before the fs is unlocked. */ |
| EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
| ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); |
| unlock_super(sb); |
| jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
| } |
| } |
| |
| static int ext4_remount(struct super_block *sb, int *flags, char *data) |
| { |
| struct ext4_super_block *es; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| ext4_fsblk_t n_blocks_count = 0; |
| unsigned long old_sb_flags; |
| struct ext4_mount_options old_opts; |
| ext4_group_t g; |
| int err; |
| #ifdef CONFIG_QUOTA |
| int i; |
| #endif |
| |
| /* Store the original options */ |
| old_sb_flags = sb->s_flags; |
| old_opts.s_mount_opt = sbi->s_mount_opt; |
| old_opts.s_resuid = sbi->s_resuid; |
| old_opts.s_resgid = sbi->s_resgid; |
| old_opts.s_commit_interval = sbi->s_commit_interval; |
| #ifdef CONFIG_QUOTA |
| old_opts.s_jquota_fmt = sbi->s_jquota_fmt; |
| for (i = 0; i < MAXQUOTAS; i++) |
| old_opts.s_qf_names[i] = sbi->s_qf_names[i]; |
| #endif |
| |
| /* |
| * Allow the "check" option to be passed as a remount option. |
| */ |
| if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| |
| if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
| ext4_abort(sb, __func__, "Abort forced by user"); |
| |
| sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| |
| es = sbi->s_es; |
| |
| ext4_init_journal_params(sb, sbi->s_journal); |
| |
| if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || |
| n_blocks_count > ext4_blocks_count(es)) { |
| if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
| err = -EROFS; |
| goto restore_opts; |
| } |
| |
| 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(EXT4_VALID_FS)) && |
| (sbi->s_mount_state & EXT4_VALID_FS)) |
| es->s_state = cpu_to_le16(sbi->s_mount_state); |
| |
| /* |
| * We have to unlock super so that we can wait for |
| * transactions. |
| */ |
| unlock_super(sb); |
| ext4_mark_recovery_complete(sb, es); |
| lock_super(sb); |
| } else { |
| __le32 ret; |
| if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| ~EXT4_FEATURE_RO_COMPAT_SUPP))) { |
| printk(KERN_WARNING "EXT4-fs: %s: couldn't " |
| "remount RDWR because of unsupported " |
| "optional features (%x).\n", |
| sb->s_id, le32_to_cpu(ret)); |
| err = -EROFS; |
| goto restore_opts; |
| } |
| |
| /* |
| * Make sure the group descriptor checksums |
| * are sane. If they aren't, refuse to |
| * remount r/w. |
| */ |
| for (g = 0; g < sbi->s_groups_count; g++) { |
| struct ext4_group_desc *gdp = |
| ext4_get_group_desc(sb, g, NULL); |
| |
| if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { |
| printk(KERN_ERR |
| "EXT4-fs: ext4_remount: " |
| "Checksum for group %lu failed (%u!=%u)\n", |
| g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), |
| le16_to_cpu(gdp->bg_checksum)); |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| } |
| |
| /* |
| * If we have an unprocessed orphan list hanging |
| * around from a previously readonly bdev mount, |
| * require a full umount/remount for now. |
| */ |
| if (es->s_last_orphan) { |
| printk(KERN_WARNING "EXT4-fs: %s: couldn't " |
| "remount RDWR because of unprocessed " |
| "orphan inode list. Please " |
| "umount/remount instead.\n", |
| sb->s_id); |
| err = -EINVAL; |
| goto restore_opts; |
| } |
| |
| /* |
| * 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.) |
| */ |
| ext4_clear_journal_err(sb, es); |
| sbi->s_mount_state = le16_to_cpu(es->s_state); |
| if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
| goto restore_opts; |
| if (!ext4_setup_super(sb, es, 0)) |
| sb->s_flags &= ~MS_RDONLY; |
| } |
| } |
| #ifdef CONFIG_QUOTA |
| /* Release old quota file names */ |
| for (i = 0; i < MAXQUOTAS; i++) |
| if (old_opts.s_qf_names[i] && |
| old_opts.s_qf_names[i] != sbi->s_qf_names[i]) |
| kfree(old_opts.s_qf_names[i]); |
| #endif |
| return 0; |
| restore_opts: |
| sb->s_flags = old_sb_flags; |
| sbi->s_mount_opt = old_opts.s_mount_opt; |
| sbi->s_resuid = old_opts.s_resuid; |
| sbi->s_resgid = old_opts.s_resgid; |
| sbi->s_commit_interval = old_opts.s_commit_interval; |
| #ifdef CONFIG_QUOTA |
| sbi->s_jquota_fmt = old_opts.s_jquota_fmt; |
| for (i = 0; i < MAXQUOTAS; i++) { |
| if (sbi->s_qf_names[i] && |
| old_opts.s_qf_names[i] != sbi->s_qf_names[i]) |
| kfree(sbi->s_qf_names[i]); |
| sbi->s_qf_names[i] = old_opts.s_qf_names[i]; |
| } |
| #endif |
| return err; |
| } |
| |
| static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| struct ext4_sb_info *sbi = EXT4_SB(sb); |
| struct ext4_super_block *es = sbi->s_es; |
| u64 fsid; |
| |
| if (test_opt(sb, MINIX_DF)) { |
| sbi->s_overhead_last = 0; |
| } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { |
| ext4_group_t ngroups = sbi->s_groups_count, i; |
| ext4_fsblk_t overhead = 0; |
| smp_rmb(); |
| |
| /* |
| * Compute the overhead (FS structures). This is constant |
| * for a given filesystem unless the number of block groups |
| * changes so we cache the previous value until it does. |
| */ |
| |
| /* |
| * 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 < ngroups; i++) { |
| overhead += ext4_bg_has_super(sb, i) + |
| ext4_bg_num_gdb(sb, i); |
| cond_resched(); |
| } |
| |
| /* |
| * Every block group has an inode bitmap, a block |
| * bitmap, and an inode table. |
| */ |
| overhead += ngroups * (2 + sbi->s_itb_per_group); |
| sbi->s_overhead_last = overhead; |
| smp_wmb(); |
| sbi->s_blocks_last = ext4_blocks_count(es); |
| } |
| |
| buf->f_type = EXT4_SUPER_MAGIC; |
| buf->f_bsize = sb->s_blocksize; |
| buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; |
| buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - |
| percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); |
| ext4_free_blocks_count_set(es, buf->f_bfree); |
| buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
| if (buf->f_bfree < ext4_r_blocks_count(es)) |
| buf->f_bavail = 0; |
| buf->f_files = le32_to_cpu(es->s_inodes_count); |
| buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
| es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
| buf->f_namelen = EXT4_NAME_LEN; |
| fsid = le64_to_cpup((void *)es->s_uuid) ^ |
| le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
| buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; |
| buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; |
| return 0; |
| } |
| |
| /* Helper function for writing quotas on sync - we need to start transaction before quota file |
| * is locked for write. Otherwise the are possible deadlocks: |
| * Process 1 Process 2 |
| * ext4_create() quota_sync() |
| * jbd2_journal_start() write_dquot() |
| * DQUOT_INIT() down(dqio_mutex) |
| * down(dqio_mutex) jbd2_journal_start() |
| * |
| */ |
| |
| #ifdef CONFIG_QUOTA |
| |
| static inline struct inode *dquot_to_inode(struct dquot *dquot) |
| { |
| return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; |
| } |
| |
| static int ext4_dquot_initialize(struct inode *inode, int type) |
| { |
| handle_t *handle; |
| int ret, err; |
| |
| /* We may create quota structure so we need to reserve enough blocks */ |
| handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_initialize(inode, type); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_dquot_drop(struct inode *inode) |
| { |
| handle_t *handle; |
| int ret, err; |
| |
| /* We may delete quota structure so we need to reserve enough blocks */ |
| handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
| if (IS_ERR(handle)) { |
| /* |
| * We call dquot_drop() anyway to at least release references |
| * to quota structures so that umount does not hang. |
| */ |
| dquot_drop(inode); |
| return PTR_ERR(handle); |
| } |
| ret = dquot_drop(inode); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_write_dquot(struct dquot *dquot) |
| { |
| int ret, err; |
| handle_t *handle; |
| struct inode *inode; |
| |
| inode = dquot_to_inode(dquot); |
| handle = ext4_journal_start(inode, |
| EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_commit(dquot); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_acquire_dquot(struct dquot *dquot) |
| { |
| int ret, err; |
| handle_t *handle; |
| |
| handle = ext4_journal_start(dquot_to_inode(dquot), |
| EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_acquire(dquot); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_release_dquot(struct dquot *dquot) |
| { |
| int ret, err; |
| handle_t *handle; |
| |
| handle = ext4_journal_start(dquot_to_inode(dquot), |
| EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); |
| if (IS_ERR(handle)) { |
| /* Release dquot anyway to avoid endless cycle in dqput() */ |
| dquot_release(dquot); |
| return PTR_ERR(handle); |
| } |
| ret = dquot_release(dquot); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| static int ext4_mark_dquot_dirty(struct dquot *dquot) |
| { |
| /* Are we journaling quotas? */ |
| if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
| EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { |
| dquot_mark_dquot_dirty(dquot); |
| return ext4_write_dquot(dquot); |
| } else { |
| return dquot_mark_dquot_dirty(dquot); |
| } |
| } |
| |
| static int ext4_write_info(struct super_block *sb, int type) |
| { |
| int ret, err; |
| handle_t *handle; |
| |
| /* Data block + inode block */ |
| handle = ext4_journal_start(sb->s_root->d_inode, 2); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| ret = dquot_commit_info(sb, type); |
| err = ext4_journal_stop(handle); |
| if (!ret) |
| ret = err; |
| return ret; |
| } |
| |
| /* |
| * Turn on quotas during mount time - we need to find |
| * the quota file and such... |
| */ |
| static int ext4_quota_on_mount(struct super_block *sb, int type) |
| { |
| return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
| EXT4_SB(sb)->s_jquota_fmt, type); |
| } |
| |
| /* |
| * Standard function to be called on quota_on |
| */ |
| static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
| char *path, int remount) |
| { |
| int err; |
| struct nameidata nd; |
| |
| if (!test_opt(sb, QUOTA)) |
| return -EINVAL; |
| /* When remounting, no checks are needed and in fact, path is NULL */ |
| if (remount) |
| return vfs_quota_on(sb, type, format_id, path, remount); |
| |
| err = path_lookup(path, LOOKUP_FOLLOW, &nd); |
| if (err) |
| return err; |
| |
| /* Quotafile not on the same filesystem? */ |
| if (nd.path.mnt->mnt_sb != sb) { |
| path_put(&nd.path); |
| return -EXDEV; |
| } |
| /* Journaling quota? */ |
| if (EXT4_SB(sb)->s_qf_names[type]) { |
| /* Quotafile not in fs root? */ |
| if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode) |
| printk(KERN_WARNING |
| "EXT4-fs: Quota file not on filesystem root. " |
| "Journaled quota will not work.\n"); |
| } |
| |
| /* |
| * When we journal data on quota file, we have to flush journal to see |
| * all updates to the file when we bypass pagecache... |
| */ |
| if (ext4_should_journal_data(nd.path.dentry->d_inode)) { |
| /* |
| * We don't need to lock updates but journal_flush() could |
| * otherwise be livelocked... |
| */ |
| jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); |
| err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); |
| jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
| if (err) { |
| path_put(&nd.path); |
| return err; |
| } |
| } |
| |
| err = vfs_quota_on_path(sb, type, format_id, &nd.path); |
| path_put(&nd.path); |
| return err; |
| } |
| |
| /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| * acquiring the locks... As quota files are never truncated and quota code |
| * itself serializes the operations (and noone else should touch the files) |
| * we don't have to be afraid of races */ |
| static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
| size_t len, loff_t off) |
| { |
| struct inode *inode = sb_dqopt(sb)->files[type]; |
| ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
| int err = 0; |
| int offset = off & (sb->s_blocksize - 1); |
| int tocopy; |
| size_t toread; |
| struct buffer_head *bh; |
| loff_t i_size = i_size_read(inode); |
| |
| if (off > i_size) |
| return 0; |
| if (off+len > i_size) |
| len = i_size-off; |
| toread = len; |
| while (toread > 0) { |
| tocopy = sb->s_blocksize - offset < toread ? |
| sb->s_blocksize - offset : toread; |
| bh = ext4_bread(NULL, inode, blk, 0, &err); |
| if (err) |
| return err; |
| if (!bh) /* A hole? */ |
| memset(data, 0, tocopy); |
| else |
| memcpy(data, bh->b_data+offset, tocopy); |
| brelse(bh); |
| offset = 0; |
| toread -= tocopy; |
| data += tocopy; |
| blk++; |
| } |
| return len; |
| } |
| |
| /* Write to quotafile (we know the transaction is already started and has |
| * enough credits) */ |
| static ssize_t ext4_quota_write(struct super_block *sb, int type, |
| const char *data, size_t len, loff_t off) |
| { |
| struct inode *inode = sb_dqopt(sb)->files[type]; |
| ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
| int err = 0; |
| int offset = off & (sb->s_blocksize - 1); |
| int tocopy; |
| int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
| size_t towrite = len; |
| struct buffer_head *bh; |
| handle_t *handle = journal_current_handle(); |
| |
| if (!handle) { |
| printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)" |
| " cancelled because transaction is not started.\n", |
| (unsigned long long)off, (unsigned long long)len); |
| return -EIO; |
| } |
| mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
| while (towrite > 0) { |
| tocopy = sb->s_blocksize - offset < towrite ? |
| sb->s_blocksize - offset : towrite; |
| bh = ext4_bread(handle, inode, blk, 1, &err); |
| if (!bh) |
| goto out; |
| if (journal_quota) { |
| err = ext4_journal_get_write_access(handle, bh); |
| if (err) { |
| brelse(bh); |
| goto out; |
| } |
| } |
| lock_buffer(bh); |
| memcpy(bh->b_data+offset, data, tocopy); |
| flush_dcache_page(bh->b_page); |
| unlock_buffer(bh); |
| if (journal_quota) |
| err = ext4_journal_dirty_metadata(handle, bh); |
| else { |
| /* Always do at least ordered writes for quotas */ |
| err = ext4_jbd2_file_inode(handle, inode); |
| mark_buffer_dirty(bh); |
| } |
| brelse(bh); |
| if (err) |
| goto out; |
| offset = 0; |
| towrite -= tocopy; |
| data += tocopy; |
| blk++; |
| } |
| out: |
| if (len == towrite) { |
| mutex_unlock(&inode->i_mutex); |
| return err; |
| } |
| if (inode->i_size < off+len-towrite) { |
| i_size_write(inode, off+len-towrite); |
| EXT4_I(inode)->i_disksize = inode->i_size; |
| } |
| inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| ext4_mark_inode_dirty(handle, inode); |
| mutex_unlock(&inode->i_mutex); |
| return len - towrite; |
| } |
| |
| #endif |
| |
| static int ext4_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| static int ext4_ui_proc_show(struct seq_file *m, void *v) |
| { |
| unsigned int *p = m->private; |
| |
| seq_printf(m, "%u\n", *p); |
| return 0; |
| } |
| |
| static int ext4_ui_proc_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, ext4_ui_proc_show, PDE(inode)->data); |
| } |
| |
| static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, |
| size_t cnt, loff_t *ppos) |
| { |
| unsigned int *p = PDE(file->f_path.dentry->d_inode)->data; |
| char str[32]; |
| unsigned long value; |
| |
| if (cnt >= sizeof(str)) |
| return -EINVAL; |
| if (copy_from_user(str, buf, cnt)) |
| return -EFAULT; |
| value = simple_strtol(str, NULL, 0); |
| if (value < 0) |
| return -ERANGE; |
| *p = value; |
| return cnt; |
| } |
| |
| const struct file_operations ext4_ui_proc_fops = { |
| .owner = THIS_MODULE, |
| .open = ext4_ui_proc_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| .write = ext4_ui_proc_write, |
| }; |
| #endif |
| |
| static struct file_system_type ext4_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext4", |
| .get_sb = ext4_get_sb, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| #ifdef CONFIG_EXT4DEV_COMPAT |
| static int ext4dev_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| printk(KERN_WARNING "EXT4-fs: Update your userspace programs " |
| "to mount using ext4\n"); |
| printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility " |
| "will go away by 2.6.31\n"); |
| return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
| } |
| |
| static struct file_system_type ext4dev_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "ext4dev", |
| .get_sb = ext4dev_get_sb, |
| .kill_sb = kill_block_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| MODULE_ALIAS("ext4dev"); |
| #endif |
| |
| static int __init init_ext4_fs(void) |
| { |
| int err; |
| |
| ext4_proc_root = proc_mkdir("fs/ext4", NULL); |
| err = init_ext4_mballoc(); |
| if (err) |
| return err; |
| |
| err = init_ext4_xattr(); |
| if (err) |
| goto out2; |
| err = init_inodecache(); |
| if (err) |
| goto out1; |
| err = register_filesystem(&ext4_fs_type); |
| if (err) |
| goto out; |
| #ifdef CONFIG_EXT4DEV_COMPAT |
| err = register_filesystem(&ext4dev_fs_type); |
| if (err) { |
| unregister_filesystem(&ext4_fs_type); |
| goto out; |
| } |
| #endif |
| return 0; |
| out: |
| destroy_inodecache(); |
| out1: |
| exit_ext4_xattr(); |
| out2: |
| exit_ext4_mballoc(); |
| return err; |
| } |
| |
| static void __exit exit_ext4_fs(void) |
| { |
| unregister_filesystem(&ext4_fs_type); |
| #ifdef CONFIG_EXT4DEV_COMPAT |
| unregister_filesystem(&ext4dev_fs_type); |
| #endif |
| destroy_inodecache(); |
| exit_ext4_xattr(); |
| exit_ext4_mballoc(); |
| remove_proc_entry("fs/ext4", NULL); |
| } |
| |
| MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); |
| MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
| MODULE_LICENSE("GPL"); |
| module_init(init_ext4_fs) |
| module_exit(exit_ext4_fs) |