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btrfs: correct try_lock_extent() usage in read_extent_buffer_subpage() 

try_lock_extent() returns 1 on success or 0 for failure and not an error
code. If try_lock_extent() fails, read_extent_buffer_subpage() returns
zero indicating subpage extent read success.

Return EAGAIN/EWOULDBLOCK if try_lock_extent() fails in locking the
extent.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Goldwyn Rodrigues 2021-04-08 07:40:25 -05:00 committed by David Sterba
parent 13311e7425
commit dc56219fe2
1 changed files with 2 additions and 4 deletions
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6
fs/btrfs/extent_io.c
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@ -6184,10 +6184,8 @@ static int read_extent_buffer_subpage(struct extent_buffer *eb, int wait,
io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
if (wait == WAIT_NONE) {
ret = try_lock_extent(io_tree, eb->start,
eb->start + eb->len - 1);
if (ret <= 0)
return ret;
if (!try_lock_extent(io_tree, eb->start, eb->start + eb->len - 1))
return -EAGAIN;
} else {
ret = lock_extent(io_tree, eb->start, eb->start + eb->len - 1);
if (ret < 0)