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| author | Yan Zheng <zheng.yan@oracle.com> | 2008-11-12 20:34:12 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-11-12 20:34:12 +0100 |
| commit | c146afad2c7fea6a366d4945c1bab9b03880f526 (patch) | |
| tree | dd217139525a521895125843ca31f61cfbb49dca /fs/btrfs/super.c | |
| parent | Btrfs: batch extent inserts/updates/deletions on the extent root (diff) | |
| download | linux-c146afad2c7fea6a366d4945c1bab9b03880f526.tar.xz linux-c146afad2c7fea6a366d4945c1bab9b03880f526.zip | |
Btrfs: mount ro and remount support
This patch adds mount ro and remount support. The main
changes in patch are: adding btrfs_remount and related
helper function; splitting the transaction related code
out of close_ctree into btrfs_commit_super; updating
allocator to properly handle read only block group.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index ab9d5e89ed13..04a3bf816509 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -370,6 +370,9 @@ int btrfs_sync_fs(struct super_block *sb, int wait) int ret; root = btrfs_sb(sb); + if (sb->s_flags & MS_RDONLY) + return 0; + sb->s_dirt = 0; if (!wait) { filemap_flush(root->fs_info->btree_inode->i_mapping); @@ -438,7 +441,7 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags, up_write(&s->s_umount); deactivate_super(s); error = -EBUSY; - goto error_bdev; + goto error_close_devices; } } else { @@ -487,7 +490,7 @@ static int btrfs_get_sb(struct file_system_type *fs_type, int flags, error_s: error = PTR_ERR(s); -error_bdev: +error_close_devices: btrfs_close_devices(fs_devices); error_free_subvol_name: kfree(subvol_name); @@ -495,6 +498,35 @@ error: return error; } +static int btrfs_remount(struct super_block *sb, int *flags, char *data) +{ + struct btrfs_root *root = btrfs_sb(sb); + int ret; + + if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) + return 0; + + if (*flags & MS_RDONLY) { + sb->s_flags |= MS_RDONLY; + + ret = btrfs_commit_super(root); + WARN_ON(ret); + } else { + if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) + return -EINVAL; + + ret = btrfs_cleanup_reloc_trees(root); + WARN_ON(ret); + + ret = btrfs_cleanup_fs_roots(root->fs_info); + WARN_ON(ret); + + sb->s_flags &= ~MS_RDONLY; + } + + return 0; +} + static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct btrfs_root *root = btrfs_sb(dentry->d_sb); @@ -582,6 +614,7 @@ static struct super_operations btrfs_super_ops = { .alloc_inode = btrfs_alloc_inode, .destroy_inode = btrfs_destroy_inode, .statfs = btrfs_statfs, + .remount_fs = btrfs_remount, .write_super_lockfs = btrfs_write_super_lockfs, .unlockfs = btrfs_unlockfs, }; |