diff options
| author | NeilBrown <neilb@suse.de> | 2014-12-15 04:56:57 +0300 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2015-02-04 00:35:52 +0300 |
| commit | 64590f45ddc7147fa1968147a1f5b5c436b728fe (patch) | |
| tree | c33e8ce09d739bac929e8ca943a253cb03cafd12 /drivers/md/raid1.c | |
| parent | 5c675f83c68fbdf9c0e103c1090b06be747fa62c (diff) | |
| download | linux-64590f45ddc7147fa1968147a1f5b5c436b728fe.tar.xz | |
md: make merge_bvec_fn more robust in face of personality changes.
There is no locking around calls to merge_bvec_fn(), so
it is possible that calls which coincide with a level (or personality)
change could go wrong.
So create a central dispatch point for these functions and use
rcu_read_lock().
If the array is suspended, reject any merge that can be rejected.
If not, we know it is safe to call the function.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid1.c')
| -rw-r--r-- | drivers/md/raid1.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 9ad7ce7091be..45c512a4b75d 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -701,11 +701,10 @@ static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sect return best_disk; } -static int raid1_mergeable_bvec(struct request_queue *q, +static int raid1_mergeable_bvec(struct mddev *mddev, struct bvec_merge_data *bvm, struct bio_vec *biovec) { - struct mddev *mddev = q->queuedata; struct r1conf *conf = mddev->private; sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); int max = biovec->bv_len; @@ -2946,8 +2945,6 @@ static int run(struct mddev *mddev) md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); if (mddev->queue) { - blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec); - if (discard_supported) queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); @@ -3183,6 +3180,7 @@ static struct md_personality raid1_personality = .quiesce = raid1_quiesce, .takeover = raid1_takeover, .congested = raid1_congested, + .mergeable_bvec = raid1_mergeable_bvec, }; static int __init raid_init(void) |