Commit 49d4a334 authored Mar 06, 2017 by Liu Bo Committed by Chris Mason Mar 17, 2017

Btrfs: fix regression in lock_delalloc_pages



The bug is a regression after commit
(da2c7009 "btrfs: teach __process_pages_contig about PAGE_LOCK operation")
and commit
(76c0021d "Btrfs: use helper to simplify lock/unlock pages").

So if the dirty pages which are under writeback got truncated partially
before we lock the dirty pages, we couldn't find all pages mapping to the
delalloc range, and the bug didn't return an error so it kept going on and
found that the delalloc range got truncated and got to unlock the dirty
pages, and then the ASSERT could caught the error, and showed

-----------------------------------------------------------------------------
assertion failed: page_ops & PAGE_LOCK, file: fs/btrfs/extent_io.c, line: 1716
-----------------------------------------------------------------------------

This fixes the bug by returning the proper -EAGAIN.

Cc: David Sterba <dsterba@suse.com>
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 68598d2e

fs/btrfs/extent_io.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1714,7 +1714,8 @@ static int __process_pages_contig(struct address_space *mapping,
		* can we find nothing at @index.
		*/
		ASSERT(page_ops & PAGE_LOCK);
		return ret;
		err = -EAGAIN;
		goto out;
		}

		for (i = 0; i < ret; i++) {

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