Btrfs: fix inode cache writeout
The code to fix stalls during free spache cache IO wasn't using
the correct root when waiting on the IO for inode caches. This
is only a problem when the inode cache is enabled with
mount -o inode_cache
This fixes the inode cache writeout to preserve any error values and
makes sure not to override the root when inode cache writeout is done.
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 253cb74..d773f22 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1149,7 +1149,8 @@
if (!inode)
return 0;
- root = root->fs_info->tree_root;
+ if (block_group)
+ root = root->fs_info->tree_root;
/* Flush the dirty pages in the cache file. */
ret = flush_dirty_cache(inode);
@@ -3463,9 +3464,12 @@
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return 0;
+ memset(&io_ctl, 0, sizeof(io_ctl));
ret = __btrfs_write_out_cache(root, inode, ctl, NULL, &io_ctl,
- trans, path, 0) ||
- btrfs_wait_cache_io(root, trans, NULL, &io_ctl, path, 0);
+ trans, path, 0);
+ if (!ret)
+ ret = btrfs_wait_cache_io(root, trans, NULL, &io_ctl, path, 0);
+
if (ret) {
btrfs_delalloc_release_metadata(inode, inode->i_size);
#ifdef DEBUG