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| author | NeilBrown <neilb@suse.de> | 2014-12-15 12:56:57 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2015-02-04 08:35:52 +1100 |
| commit | 64590f45ddc7147fa1968147a1f5b5c436b728fe (patch) | |
| tree | c33e8ce09d739bac929e8ca943a253cb03cafd12 /drivers/md/raid0.c | |
| parent | 5c675f83c68fbdf9c0e103c1090b06be747fa62c (diff) | |
| download | linux-stable-64590f45ddc7147fa1968147a1f5b5c436b728fe.tar.gz linux-stable-64590f45ddc7147fa1968147a1f5b5c436b728fe.tar.bz2 linux-stable-64590f45ddc7147fa1968147a1f5b5c436b728fe.zip | |
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/raid0.c')
| -rw-r--r-- | drivers/md/raid0.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 4b521eac5b69..3770c9675b17 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -350,17 +350,16 @@ static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, /** * raid0_mergeable_bvec -- tell bio layer if two requests can be merged - * @q: request queue + * @mddev: the md device * @bvm: properties of new bio * @biovec: the request that could be merged to it. * * Return amount of bytes we can accept at this offset */ -static int raid0_mergeable_bvec(struct request_queue *q, +static int raid0_mergeable_bvec(struct mddev *mddev, struct bvec_merge_data *bvm, struct bio_vec *biovec) { - struct mddev *mddev = q->queuedata; struct r0conf *conf = mddev->private; sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); sector_t sector_offset = sector; @@ -465,7 +464,6 @@ static int raid0_run(struct mddev *mddev) mddev->queue->backing_dev_info.ra_pages = 2* stripe; } - blk_queue_merge_bvec(mddev->queue, raid0_mergeable_bvec); dump_zones(mddev); ret = md_integrity_register(mddev); @@ -724,6 +722,7 @@ static struct md_personality raid0_personality= .takeover = raid0_takeover, .quiesce = raid0_quiesce, .congested = raid0_congested, + .mergeable_bvec = raid0_mergeable_bvec, }; static int __init raid0_init (void) |