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btrfs: make lock_extent_buffer_for_io() to be subpage compatible 

For subpage metadata, we don't use page locking at all.  So just skip
the page locking part for subpage.  The rest of the function can be
reused.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2021-04-06 08:36:02 +08:00 committed by David Sterba
parent 35b6ddfa96
commit f3156df944
1 changed files with 7 additions and 1 deletions
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8
fs/btrfs/extent_io.c
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@ -3967,7 +3967,13 @@ static noinline_for_stack int lock_extent_buffer_for_io(struct extent_buffer *eb
btrfs_tree_unlock(eb);
if (!ret)
/*
* Either we don't need to submit any tree block, or we're submitting
* subpage eb.
* Subpage metadata doesn't use page locking at all, so we can skip
* the page locking.
*/
if (!ret || fs_info->sectorsize < PAGE_SIZE)
return ret;
num_pages = num_extent_pages(eb);