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Btrfs: fix up read_tree_block to return proper error

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The return value of read_tree_block() can confuse callers as it always
returns NULL for either -ENOMEM or -EIO, so it's likely that callers
parse it to a wrong error, for instance, in btrfs_read_tree_root().

This fixes the above issue.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Liu Bo 2015-05-25 17:30:15 +08:00 • committed by Chris Mason
parent 8635eda91e
commit 64c043de46
5 changed files with 54 additions and 29 deletions
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9
fs/btrfs/backref.c
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@ -491,7 +491,9 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
BUG_ON(!ref->wanted_disk_byte);
eb = read_tree_block(fs_info->tree_root, ref->wanted_disk_byte,
0);
if (!eb || !extent_buffer_uptodate(eb)) {
if (IS_ERR(eb)) {
return PTR_ERR(eb);
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
return -EIO;
}
@ -1034,7 +1036,10 @@ again:
eb = read_tree_block(fs_info->extent_root,
ref->parent, 0);
if (!eb || !extent_buffer_uptodate(eb)) {
if (IS_ERR(eb)) {
ret = PTR_ERR(eb);
goto out;
} else if (!extent_buffer_uptodate(eb)) {
free_extent_buffer(eb);
ret = -EIO;
goto out;