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| author | Jan Kara <jack@suse.cz> | 2012-06-12 16:20:46 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-07-31 09:45:53 +0400 |
| commit | 1e8b212fe5dcee9d3dbb152d235f3c33458fb26e (patch) | |
| tree | c21036f86f455c6289704b35c58c8d01d7821f12 /fs/ext2/super.c | |
| parent | b2b5ef5c8e89f19b68c174bf246f3ca212dbf0bc (diff) | |
| download | linux-stable-1e8b212fe5dcee9d3dbb152d235f3c33458fb26e.tar.gz linux-stable-1e8b212fe5dcee9d3dbb152d235f3c33458fb26e.tar.bz2 linux-stable-1e8b212fe5dcee9d3dbb152d235f3c33458fb26e.zip | |
ext2: Implement freezing
The only missing piece to make freezing work reliably with ext2 is to
stop iput() of unlinked inode from deleting the inode on frozen filesystem.
So add a necessary protection to ext2_evict_inode().
We also provide appropriate ->freeze_fs and ->unfreeze_fs functions.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ext2/super.c')
| -rw-r--r-- | fs/ext2/super.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 5df3d2d8169c..15761e638dae 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -42,6 +42,8 @@ static void ext2_sync_super(struct super_block *sb, static int ext2_remount (struct super_block * sb, int * flags, char * data); static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); static int ext2_sync_fs(struct super_block *sb, int wait); +static int ext2_freeze(struct super_block *sb); +static int ext2_unfreeze(struct super_block *sb); void ext2_error(struct super_block *sb, const char *function, const char *fmt, ...) @@ -305,6 +307,8 @@ static const struct super_operations ext2_sops = { .evict_inode = ext2_evict_inode, .put_super = ext2_put_super, .sync_fs = ext2_sync_fs, + .freeze_fs = ext2_freeze, + .unfreeze_fs = ext2_unfreeze, .statfs = ext2_statfs, .remount_fs = ext2_remount, .show_options = ext2_show_options, @@ -1200,6 +1204,35 @@ static int ext2_sync_fs(struct super_block *sb, int wait) return 0; } +static int ext2_freeze(struct super_block *sb) +{ + struct ext2_sb_info *sbi = EXT2_SB(sb); + + /* + * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared + * because we have unattached inodes and thus filesystem is not fully + * consistent. + */ + if (atomic_long_read(&sb->s_remove_count)) { + ext2_sync_fs(sb, 1); + return 0; + } + /* Set EXT2_FS_VALID flag */ + spin_lock(&sbi->s_lock); + sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); + spin_unlock(&sbi->s_lock); + ext2_sync_super(sb, sbi->s_es, 1); + + return 0; +} + +static int ext2_unfreeze(struct super_block *sb) +{ + /* Just write sb to clear EXT2_VALID_FS flag */ + ext2_write_super(sb); + + return 0; +} void ext2_write_super(struct super_block *sb) { |