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authorChristoph Hellwig <hch@lst.de>2009-05-05 15:41:25 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-11 21:36:06 -0400
commit5af7926ff33b68b3ba46531471c6e0564b285efc (patch)
treea25266f9db482ce9dd8e663148ffb0f1a524bd83 /fs/btrfs/super.c
parente5004753388dcf5e1b8a52ac0ab807d232340fbb (diff)
downloadlinux-5af7926ff33b68b3ba46531471c6e0564b285efc.tar.bz2
enforce ->sync_fs is only called for rw superblock
Make sure a superblock really is writeable by checking MS_RDONLY under s_umount. sync_filesystems needed some re-arragement for that, but all but one sync_filesystem caller had the correct locking already so that we could add that check there. cachefiles grew s_umount locking. I've also added a WARN_ON to sync_filesystem to assert this for future callers. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r--fs/btrfs/super.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 52d84522c2c2..9f179d4832d5 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -394,9 +394,6 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
struct btrfs_root *root = btrfs_sb(sb);
int ret;
- if (sb->s_flags & MS_RDONLY)
- return 0;
-
if (!wait) {
filemap_flush(root->fs_info->btree_inode->i_mapping);
return 0;