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authorAmir Goldstein <amir73il@gmail.com>2011-02-28 00:53:45 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-03-27 11:36:40 -0700
commit5dae5f51c3c95958381e88f561efd5bc9b7d1bf5 (patch)
tree8ed09f0501cd54dd4f60a82b48025ece021a3e32
parent0dc58dee18c289cbbaa6fb4b5746d6b503ae5642 (diff)
ext4: skip orphan cleanup if fs has unknown ROCOMPAT features
commit d39195c33bb1b5fdcb0f416e8a0b34bfdb07a027 upstream. Orphan cleanup is currently executed even if the file system has some number of unknown ROCOMPAT features, which deletes inodes and frees blocks, which could be very bad for some RO_COMPAT features, especially the SNAPSHOT feature. This patch skips the orphan cleanup if it contains readonly compatible features not known by this ext4 implementation, which would prevent the fs from being mounted (or remounted) readwrite. Signed-off-by: Amir Goldstein <amir73il@users.sf.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/ext4/super.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f6a318f836b2..4381efee3dbc 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -75,6 +75,7 @@ static void ext4_write_super(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data);
+static int ext4_feature_set_ok(struct super_block *sb, int readonly);
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
static void ext4_clear_request_list(void);
@@ -2120,6 +2121,13 @@ static void ext4_orphan_cleanup(struct super_block *sb,
return;
}
+ /* Check if feature set would not allow a r/w mount */
+ if (!ext4_feature_set_ok(sb, 0)) {
+ ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
+ "unknown ROCOMPAT features");
+ return;
+ }
+
if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
if (es->s_last_orphan)
jbd_debug(1, "Errors on filesystem, "