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authorNeilBrown <neilb@suse.com>2017-04-06 12:06:37 +1000
committerShaohua Li <shli@fb.com>2017-04-10 11:05:26 -0700
commit0c9d5b127f695818c2c5a3868c1f28ca2969e905 (patch)
tree4ff179930a3a3d3bd3b36a3fe7d7d043a76d8a53 /drivers/md/raid1.c
parentb670883bb9e55ba63a278d83e034faefc01ce2cf (diff)
md/raid1: avoid reusing a resync bio after error handling.
fix_sync_read_error() modifies a bio on a newly faulty device by setting bi_end_io to end_sync_write. This ensure that put_buf() will still call rdev_dec_pending() as required, but makes sure that subsequent code in fix_sync_read_error() doesn't try to read from the device. Unfortunately this interacts badly with sync_request_write() which assumes that any bio with bi_end_io set to non-NULL other than end_sync_read is safe to write to. As the device is now faulty it doesn't make sense to write. As the bio was recently used for a read, it is "dirty" and not suitable for immediate submission. In particular, ->bi_next might be non-NULL, which will cause generic_make_request() to complain. Break this interaction by refusing to write to devices which are marked as Faulty. Reported-and-tested-by: Michael Wang <yun.wang@profitbricks.com> Fixes: 2e52d449bcec ("md/raid1: add failfast handling for reads.") Cc: stable@vger.kernel.org (v4.10+) Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid1.c')
-rw-r--r--drivers/md/raid1.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 7d6723558fd8..70278b9a3c43 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -2218,6 +2218,8 @@ static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio)
(i == r1_bio->read_disk ||
!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))))
continue;
+ if (test_bit(Faulty, &conf->mirrors[i].rdev->flags))
+ continue;
bio_set_op_attrs(wbio, REQ_OP_WRITE, 0);
if (test_bit(FailFast, &conf->mirrors[i].rdev->flags))