diff options
Diffstat (limited to 'drivers/md/linear.c')
| -rw-r--r-- | drivers/md/linear.c | 67 |
1 files changed, 20 insertions, 47 deletions
diff --git a/drivers/md/linear.c b/drivers/md/linear.c index 64713b7..fa7d577 100644 --- a/drivers/md/linear.c +++ b/drivers/md/linear.c @@ -34,7 +34,7 @@ static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector) lo = 0; hi = mddev->raid_disks - 1; - conf = rcu_dereference(mddev->private); + conf = mddev->private; /* * Binary Search @@ -60,18 +60,16 @@ static inline struct dev_info *which_dev(struct mddev *mddev, sector_t sector) * * Return amount of bytes we can take at this offset */ -static int linear_mergeable_bvec(struct request_queue *q, +static int linear_mergeable_bvec(struct mddev *mddev, struct bvec_merge_data *bvm, struct bio_vec *biovec) { - struct mddev *mddev = q->queuedata; struct dev_info *dev0; unsigned long maxsectors, bio_sectors = bvm->bi_size >> 9; sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); int maxbytes = biovec->bv_len; struct request_queue *subq; - rcu_read_lock(); dev0 = which_dev(mddev, sector); maxsectors = dev0->end_sector - sector; subq = bdev_get_queue(dev0->rdev->bdev); @@ -81,7 +79,6 @@ static int linear_mergeable_bvec(struct request_queue *q, maxbytes = min(maxbytes, subq->merge_bvec_fn(subq, bvm, biovec)); } - rcu_read_unlock(); if (maxsectors < bio_sectors) maxsectors = 0; @@ -97,24 +94,18 @@ static int linear_mergeable_bvec(struct request_queue *q, return maxsectors << 9; } -static int linear_congested(void *data, int bits) +static int linear_congested(struct mddev *mddev, int bits) { - struct mddev *mddev = data; struct linear_conf *conf; int i, ret = 0; - if (mddev_congested(mddev, bits)) - return 1; - - rcu_read_lock(); - conf = rcu_dereference(mddev->private); + conf = mddev->private; for (i = 0; i < mddev->raid_disks && !ret ; i++) { struct request_queue *q = bdev_get_queue(conf->disks[i].rdev->bdev); ret |= bdi_congested(&q->backing_dev_info, bits); } - rcu_read_unlock(); return ret; } @@ -123,12 +114,10 @@ static sector_t linear_size(struct mddev *mddev, sector_t sectors, int raid_disk struct linear_conf *conf; sector_t array_sectors; - rcu_read_lock(); - conf = rcu_dereference(mddev->private); + conf = mddev->private; WARN_ONCE(sectors || raid_disks, "%s does not support generic reshape\n", __func__); array_sectors = conf->array_sectors; - rcu_read_unlock(); return array_sectors; } @@ -217,10 +206,6 @@ static int linear_run (struct mddev *mddev) mddev->private = conf; md_set_array_sectors(mddev, linear_size(mddev, 0, 0)); - blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec); - mddev->queue->backing_dev_info.congested_fn = linear_congested; - mddev->queue->backing_dev_info.congested_data = mddev; - ret = md_integrity_register(mddev); if (ret) { kfree(conf); @@ -252,38 +237,23 @@ static int linear_add(struct mddev *mddev, struct md_rdev *rdev) if (!newconf) return -ENOMEM; - oldconf = rcu_dereference_protected(mddev->private, - lockdep_is_held( - &mddev->reconfig_mutex)); + mddev_suspend(mddev); + oldconf = mddev->private; mddev->raid_disks++; - rcu_assign_pointer(mddev->private, newconf); + mddev->private = newconf; md_set_array_sectors(mddev, linear_size(mddev, 0, 0)); set_capacity(mddev->gendisk, mddev->array_sectors); + mddev_resume(mddev); revalidate_disk(mddev->gendisk); - kfree_rcu(oldconf, rcu); + kfree(oldconf); return 0; } -static int linear_stop (struct mddev *mddev) +static void linear_free(struct mddev *mddev, void *priv) { - struct linear_conf *conf = - rcu_dereference_protected(mddev->private, - lockdep_is_held( - &mddev->reconfig_mutex)); + struct linear_conf *conf = priv; - /* - * We do not require rcu protection here since - * we hold reconfig_mutex for both linear_add and - * linear_stop, so they cannot race. - * We should make sure any old 'conf's are properly - * freed though. - */ - rcu_barrier(); - blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ kfree(conf); - mddev->private = NULL; - - return 0; } static void linear_make_request(struct mddev *mddev, struct bio *bio) @@ -299,16 +269,12 @@ static void linear_make_request(struct mddev *mddev, struct bio *bio) } do { - rcu_read_lock(); - tmp_dev = which_dev(mddev, bio->bi_iter.bi_sector); start_sector = tmp_dev->end_sector - tmp_dev->rdev->sectors; end_sector = tmp_dev->end_sector; data_offset = tmp_dev->rdev->data_offset; bio->bi_bdev = tmp_dev->rdev->bdev; - rcu_read_unlock(); - if (unlikely(bio->bi_iter.bi_sector >= end_sector || bio->bi_iter.bi_sector < start_sector)) goto out_of_bounds; @@ -355,6 +321,10 @@ static void linear_status (struct seq_file *seq, struct mddev *mddev) seq_printf(seq, " %dk rounding", mddev->chunk_sectors / 2); } +static void linear_quiesce(struct mddev *mddev, int state) +{ +} + static struct md_personality linear_personality = { .name = "linear", @@ -362,10 +332,13 @@ static struct md_personality linear_personality = .owner = THIS_MODULE, .make_request = linear_make_request, .run = linear_run, - .stop = linear_stop, + .free = linear_free, .status = linear_status, .hot_add_disk = linear_add, .size = linear_size, + .quiesce = linear_quiesce, + .congested = linear_congested, + .mergeable_bvec = linear_mergeable_bvec, }; static int __init linear_init (void) |