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| author |   Liu Bo <bo.li.liu@oracle.com> | 2015-05-25 17:30:15 +0800 |
|---|---|---|
| committer |   Chris Mason <clm@fb.com> | 2015-06-03 04:03:08 -0700 |
| commit | 64c043de466d5746e7ca306dab9d418cd871cefc (patch) | |
| tree | fcce36cbfdc022f24b5b847152d6b17c967a1b64 /fs/btrfs/relocation.c | |
| parent | Btrfs: add missing free_extent_buffer (diff) | |
| download | linux-dev-64c043de466d5746e7ca306dab9d418cd871cefc.tar.xz linux-dev-64c043de466d5746e7ca306dab9d418cd871cefc.zip | |
Btrfs: fix up read_tree_block to return proper error
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>
Diffstat (limited to 'fs/btrfs/relocation.c')
| -rw-r--r-- | fs/btrfs/relocation.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 74b24b01d574..827951fbf7fc 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -1847,8 +1847,10 @@ again: } eb = read_tree_block(dest, old_bytenr, old_ptr_gen); - if (!eb || !extent_buffer_uptodate(eb)) { - ret = (!eb) ? -ENOMEM : -EIO; + if (IS_ERR(eb)) { + ret = PTR_ERR(eb); + } else if (!extent_buffer_uptodate(eb)) { + ret = -EIO; free_extent_buffer(eb); break; } @@ -2002,7 +2004,9 @@ int walk_down_reloc_tree(struct btrfs_root *root, struct btrfs_path *path, bytenr = btrfs_node_blockptr(eb, path->slots[i]); eb = read_tree_block(root, bytenr, ptr_gen); - 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; } @@ -2710,7 +2714,10 @@ static int do_relocation(struct btrfs_trans_handle *trans, blocksize = root->nodesize; generation = btrfs_node_ptr_generation(upper->eb, slot); eb = read_tree_block(root, bytenr, generation); - if (!eb || !extent_buffer_uptodate(eb)) { + if (IS_ERR(eb)) { + err = PTR_ERR(eb); + goto next; + } else if (!extent_buffer_uptodate(eb)) { free_extent_buffer(eb); err = -EIO; goto next; @@ -2873,7 +2880,9 @@ static int get_tree_block_key(struct reloc_control *rc, BUG_ON(block->key_ready); eb = read_tree_block(rc->extent_root, block->bytenr, block->key.offset); - 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; } |