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btrfs: Replace BUG_ON with ASSERT in find_lock_delalloc_range 

lock_delalloc_pages should only return 2 values - 0 in case of success
and -EAGAIN if the range of pages to be locked should be shrunk due to
some of gone. Manual inspections confirms that this is indeed the case
since __process_pages_contig is where lock_delalloc_pages gets its
return value. The latter always returns 0  or -EAGAIN so the invariant
holds. No functional changes.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-10-26 14:43:21 +03:00 committed by David Sterba
parent 917aacecc5
commit 9bfd61d975
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent_io.c
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@ -1599,6 +1599,7 @@ again:
/* step two, lock all the pages after the page that has start */ /* step two, lock all the pages after the page that has start */
ret = lock_delalloc_pages(inode, locked_page, ret = lock_delalloc_pages(inode, locked_page,
delalloc_start, delalloc_end); delalloc_start, delalloc_end);
ASSERT(!ret || ret == -EAGAIN);
if (ret == -EAGAIN) { if (ret == -EAGAIN) {
/* some of the pages are gone, lets avoid looping by /* some of the pages are gone, lets avoid looping by
* shortening the size of the delalloc range we're searching * shortening the size of the delalloc range we're searching
@ -1614,7 +1615,6 @@ again:
goto out_failed; goto out_failed;
} }
} }
BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */
/* step three, lock the state bits for the whole range */ /* step three, lock the state bits for the whole range */
lock_extent_bits(tree, delalloc_start, delalloc_end, &cached_state); lock_extent_bits(tree, delalloc_start, delalloc_end, &cached_state);