diff options
| author | Guoqing Jiang <guoqing.jiang@linux.dev> | 2021-10-04 23:34:48 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 14:50:25 -0600 |
| commit | fd3b6975e9c11c4fa00965f82a0bfbb3b7b44101 (patch) | |
| tree | 5eb2e9695bdee90a4a360abc7160dd1100505b07 /drivers/md/raid1.c | |
| parent | 7ad1069166c0ccdd572d27e01cc7f7f84477df1e (diff) | |
md/raid1: only allocate write behind bio for WriteMostly device
Commit 6607cd319b6b91bff94e90f798a61c031650b514 ("raid1: ensure write
behind bio has less than BIO_MAX_VECS sectors") tried to guarantee the
size of behind bio is not bigger than BIO_MAX_VECS sectors.
Unfortunately the same calltrace still could happen since an array could
enable write-behind without write mostly device.
To match the manpage of mdadm (which says "write-behind is only attempted
on drives marked as write-mostly"), we need to check WriteMostly flag to
avoid such unexpected behavior.
[1]. https://bugzilla.kernel.org/show_bug.cgi?id=213181#c25
Cc: stable@vger.kernel.org # v5.12+
Cc: Jens Stutte <jens@chianterastutte.eu>
Reported-by: Jens Stutte <jens@chianterastutte.eu>
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md/raid1.c')
| -rw-r--r-- | drivers/md/raid1.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 19598bd38939..6ba12f0f0f03 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1496,7 +1496,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, if (!r1_bio->bios[i]) continue; - if (first_clone) { + if (first_clone && test_bit(WriteMostly, &rdev->flags)) { /* do behind I/O ? * Not if there are too many, or cannot * allocate memory, or a reader on WriteMostly |