btrfs: don't stop integrity writeback too early

extent_write_cache_pages stops writing pages as soon as nr_to_write hits
zero.  That is the right thing for opportunistic writeback, but incorrect
for data integrity writeback, which needs to ensure that no dirty pages
are left in the range.  Thus only stop the writeback for WB_SYNC_NONE
if nr_to_write hits 0.

This is a port of write_cache_pages changes in commit 05fe478dd04e
("mm: write_cache_pages integrity fix").

Note that I've only trigger the problem with other changes to the btrfs
writeback code, but this condition seems worthwhile fixing anyway.

CC: stable@vger.kernel.org # 4.14+
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
[ updated comment ]
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a91d5ad2798428a803f749086912d169d9d544f0..c36eb4956f812a318fb8f32efe858edc6a7f6ee0 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2164,11 +2164,12 @@ retry:
                        }
 
                        /*
-                        * the filesystem may choose to bump up nr_to_write.
+                        * The filesystem may choose to bump up nr_to_write.
                         * We have to make sure to honor the new nr_to_write
-                        * at any time
+                        * at any time.
                         */
-                       nr_to_write_done = wbc->nr_to_write <= 0;
+                       nr_to_write_done = (wbc->sync_mode == WB_SYNC_NONE &&
+                                           wbc->nr_to_write <= 0);
                }
                folio_batch_release(&fbatch);
                cond_resched();