From: Takafumi Kubota <takafumi.kubota1012@sslab.ics.keio.ac.jp>
Date: Thu, 9 Feb 2017 08:24:33 +0000 (+0900)
Subject: Btrfs: add another missing end_page_writeback on submit_extent_page failure
X-Git-Tag: v4.11-rc1~69^2~56
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fe01aa65385c226d822013b90608b67c485f8dc6;p=karo-tx-linux.git

Btrfs: add another missing end_page_writeback on submit_extent_page failure

If btrfs_bio_alloc fails in submit_extent_page, submit_extent_page returns
without clearing the writeback bit of the failed page.

__extent_writepage_io, that is a caller of submit_extent_page,
does not clear the remaining writeback bit anywhere.
As a result, this will cause the hang at filemap_fdatawait_range,
because it waits the writeback bit to be cleared from the failed page.
So, we have to call end_page_writeback to clear the writeback bit.

For reproducing the hang, we inject a fault like

   if (should_failtest()) { // I define should_failtest()
        bio = NULL;
   }
   else {
        bio = btrfs_bio_alloc(...);
   }

in submit_extent_page.

We should also check whether page has the bit before end_page_writeback,
to avoid the conflict against the other end_page_writeback in bio_endio.
Thus, we add PageWriteback checks not only in __extent_writepage_io,
but also in write_one_eb too, because it misses the check.

Signed-off-by: Takafumi Kubota <takafumi.kubota1012@sslab.ics.keio.ac.jp>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 4a8b119655d5..9df6ed30de00 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3437,8 +3437,11 @@ static noinline_for_stack int __extent_writepage_io(struct inode *inode,
 					 bdev, &epd->bio, max_nr,
 					 end_bio_extent_writepage,
 					 0, 0, 0, false);
-		if (ret)
+		if (ret) {
 			SetPageError(page);
+			if (PageWriteback(page))
+				end_page_writeback(page);
+		}
 
 		cur = cur + iosize;
 		pg_offset += iosize;
@@ -3754,7 +3757,8 @@ static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
 		epd->bio_flags = bio_flags;
 		if (ret) {
 			set_btree_ioerr(p);
-			end_page_writeback(p);
+			if (PageWriteback(p))
+				end_page_writeback(p);
 			if (atomic_sub_and_test(num_pages - i, &eb->io_pages))
 				end_extent_buffer_writeback(eb);
 			ret = -EIO;