#include <linux/ktime.h>
#include <linux/elevator.h> /* for rq_end_sector() */
#include <linux/blk-mq.h>
+#include <linux/pr.h>
#include <trace/events/block.h>
#define DMF_FREEING 3
#define DMF_DELETING 4
#define DMF_NOFLUSH_SUSPENDING 5
-#define DMF_MERGE_IS_OPTIONAL 6
-#define DMF_DEFERRED_REMOVE 7
-#define DMF_SUSPENDED_INTERNALLY 8
+#define DMF_DEFERRED_REMOVE 6
+#define DMF_SUSPENDED_INTERNALLY 7
/*
* A dummy definition to make RCU happy.
return dm_get_geometry(md, geo);
}
-static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
- unsigned int cmd, unsigned long arg)
+static int dm_get_live_table_for_ioctl(struct mapped_device *md,
+ struct dm_target **tgt, struct block_device **bdev,
+ fmode_t *mode, int *srcu_idx)
{
- struct mapped_device *md = bdev->bd_disk->private_data;
- int srcu_idx;
struct dm_table *map;
- struct dm_target *tgt;
- int r = -ENOTTY;
+ int r;
retry:
- map = dm_get_live_table(md, &srcu_idx);
-
+ r = -ENOTTY;
+ map = dm_get_live_table(md, srcu_idx);
if (!map || !dm_table_get_size(map))
goto out;
if (dm_table_get_num_targets(map) != 1)
goto out;
- tgt = dm_table_get_target(map, 0);
- if (!tgt->type->ioctl)
+ *tgt = dm_table_get_target(map, 0);
+
+ if (!(*tgt)->type->prepare_ioctl)
goto out;
if (dm_suspended_md(md)) {
goto out;
}
- r = tgt->type->ioctl(tgt, cmd, arg);
+ r = (*tgt)->type->prepare_ioctl(*tgt, bdev, mode);
+ if (r < 0)
+ goto out;
-out:
- dm_put_live_table(md, srcu_idx);
+ return r;
+out:
+ dm_put_live_table(md, *srcu_idx);
if (r == -ENOTCONN) {
msleep(10);
goto retry;
}
+ return r;
+}
+static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ struct dm_target *tgt;
+ int srcu_idx, r;
+
+ r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
+ if (r < 0)
+ return r;
+
+ if (r > 0) {
+ /*
+ * Target determined this ioctl is being issued against
+ * a logical partition of the parent bdev; so extra
+ * validation is needed.
+ */
+ r = scsi_verify_blk_ioctl(NULL, cmd);
+ if (r)
+ goto out;
+ }
+
+ r = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
+out:
+ dm_put_live_table(md, srcu_idx);
return r;
}
} else {
/* done with normal IO or empty flush */
trace_block_bio_complete(md->queue, bio, io_error);
- bio_endio(bio, io_error);
+ bio->bi_error = io_error;
+ bio_endio(bio);
}
}
}
limits->max_write_same_sectors = 0;
}
-static void clone_endio(struct bio *bio, int error)
+static void clone_endio(struct bio *bio)
{
+ int error = bio->bi_error;
int r = error;
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
struct dm_io *io = tio->io;
struct mapped_device *md = tio->io->md;
dm_endio_fn endio = tio->ti->type->end_io;
- if (!bio_flagged(bio, BIO_UPTODATE) && !error)
- error = -EIO;
-
if (endio) {
r = endio(tio->ti, bio, error);
if (r < 0 || r == DM_ENDIO_REQUEUE)
/*
* Partial completion handling for request-based dm
*/
-static void end_clone_bio(struct bio *clone, int error)
+static void end_clone_bio(struct bio *clone)
{
struct dm_rq_clone_bio_info *info =
container_of(clone, struct dm_rq_clone_bio_info, clone);
* the remainder.
*/
return;
- else if (error) {
+ else if (bio->bi_error) {
/*
* Don't notice the error to the upper layer yet.
* The error handling decision is made by the target driver,
* when the request is completed.
*/
- tio->error = error;
+ tio->error = bio->bi_error;
return;
}
md = tio->io->md;
dec_pending(tio->io, r);
free_tio(md, tio);
- } else if (r) {
+ } else if (r != DM_MAPIO_SUBMITTED) {
DMWARN("unimplemented target map return value: %d", r);
BUG();
}
* CRUD END
*---------------------------------------------------------------*/
-static int dm_merge_bvec(struct request_queue *q,
- struct bvec_merge_data *bvm,
- struct bio_vec *biovec)
-{
- struct mapped_device *md = q->queuedata;
- struct dm_table *map = dm_get_live_table_fast(md);
- struct dm_target *ti;
- sector_t max_sectors;
- int max_size = 0;
-
- if (unlikely(!map))
- goto out;
-
- ti = dm_table_find_target(map, bvm->bi_sector);
- if (!dm_target_is_valid(ti))
- goto out;
-
- /*
- * Find maximum amount of I/O that won't need splitting
- */
- max_sectors = min(max_io_len(bvm->bi_sector, ti),
- (sector_t) BIO_MAX_SECTORS);
- max_size = (max_sectors << SECTOR_SHIFT) - bvm->bi_size;
- if (max_size < 0)
- max_size = 0;
-
- /*
- * merge_bvec_fn() returns number of bytes
- * it can accept at this offset
- * max is precomputed maximal io size
- */
- if (max_size && ti->type->merge)
- max_size = ti->type->merge(ti, bvm, biovec, max_size);
- /*
- * If the target doesn't support merge method and some of the devices
- * provided their merge_bvec method (we know this by looking at
- * queue_max_hw_sectors), then we can't allow bios with multiple vector
- * entries. So always set max_size to 0, and the code below allows
- * just one page.
- */
- else if (queue_max_hw_sectors(q) <= PAGE_SIZE >> 9)
- max_size = 0;
-
-out:
- dm_put_live_table_fast(md);
- /*
- * Always allow an entire first page
- */
- if (max_size <= biovec->bv_len && !(bvm->bi_size >> SECTOR_SHIFT))
- max_size = biovec->bv_len;
-
- return max_size;
-}
-
/*
* The request function that just remaps the bio built up by
* dm_merge_bvec.
* This queue is new, so no concurrency on the queue_flags.
*/
queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue);
+
+ /*
+ * Initialize data that will only be used by a non-blk-mq DM queue
+ * - must do so here (in alloc_dev callchain) before queue is used
+ */
+ md->queue->queuedata = md;
+ md->queue->backing_dev_info.congested_data = md;
}
static void dm_init_old_md_queue(struct mapped_device *md)
/*
* Initialize aspects of queue that aren't relevant for blk-mq
*/
- md->queue->queuedata = md;
md->queue->backing_dev_info.congested_fn = dm_any_congested;
- md->queue->backing_dev_info.congested_data = md;
-
blk_queue_bounce_limit(md->queue, BLK_BOUNCE_ANY);
}
destroy_workqueue(md->wq);
if (md->kworker_task)
kthread_stop(md->kworker_task);
- if (md->io_pool)
- mempool_destroy(md->io_pool);
- if (md->rq_pool)
- mempool_destroy(md->rq_pool);
+ mempool_destroy(md->io_pool);
+ mempool_destroy(md->rq_pool);
if (md->bs)
bioset_free(md->bs);
i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
}
-/*
- * Return 1 if the queue has a compulsory merge_bvec_fn function.
- *
- * If this function returns 0, then the device is either a non-dm
- * device without a merge_bvec_fn, or it is a dm device that is
- * able to split any bios it receives that are too big.
- */
-int dm_queue_merge_is_compulsory(struct request_queue *q)
-{
- struct mapped_device *dev_md;
-
- if (!q->merge_bvec_fn)
- return 0;
-
- if (q->make_request_fn == dm_make_request) {
- dev_md = q->queuedata;
- if (test_bit(DMF_MERGE_IS_OPTIONAL, &dev_md->flags))
- return 0;
- }
-
- return 1;
-}
-
-static int dm_device_merge_is_compulsory(struct dm_target *ti,
- struct dm_dev *dev, sector_t start,
- sector_t len, void *data)
-{
- struct block_device *bdev = dev->bdev;
- struct request_queue *q = bdev_get_queue(bdev);
-
- return dm_queue_merge_is_compulsory(q);
-}
-
-/*
- * Return 1 if it is acceptable to ignore merge_bvec_fn based
- * on the properties of the underlying devices.
- */
-static int dm_table_merge_is_optional(struct dm_table *table)
-{
- unsigned i = 0;
- struct dm_target *ti;
-
- while (i < dm_table_get_num_targets(table)) {
- ti = dm_table_get_target(table, i++);
-
- if (ti->type->iterate_devices &&
- ti->type->iterate_devices(ti, dm_device_merge_is_compulsory, NULL))
- return 0;
- }
-
- return 1;
-}
-
/*
* Returns old map, which caller must destroy.
*/
struct dm_table *old_map;
struct request_queue *q = md->queue;
sector_t size;
- int merge_is_optional;
size = dm_table_get_size(t);
__bind_mempools(md, t);
- merge_is_optional = dm_table_merge_is_optional(t);
-
old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
rcu_assign_pointer(md->map, t);
md->immutable_target_type = dm_table_get_immutable_target_type(t);
dm_table_set_restrictions(t, q, limits);
- if (merge_is_optional)
- set_bit(DMF_MERGE_IS_OPTIONAL, &md->flags);
- else
- clear_bit(DMF_MERGE_IS_OPTIONAL, &md->flags);
if (old_map)
dm_sync_table(md);
case DM_TYPE_BIO_BASED:
dm_init_old_md_queue(md);
blk_queue_make_request(md->queue, dm_make_request);
- blk_queue_merge_bvec(md->queue, dm_merge_bvec);
+ /*
+ * DM handles splitting bios as needed. Free the bio_split bioset
+ * since it won't be used (saves 1 process per bio-based DM device).
+ */
+ bioset_free(md->queue->bio_split);
+ md->queue->bio_split = NULL;
break;
}
if (!pools)
return;
- if (pools->io_pool)
- mempool_destroy(pools->io_pool);
-
- if (pools->rq_pool)
- mempool_destroy(pools->rq_pool);
+ mempool_destroy(pools->io_pool);
+ mempool_destroy(pools->rq_pool);
if (pools->bs)
bioset_free(pools->bs);
kfree(pools);
}
+static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
+ u32 flags)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ const struct pr_ops *ops;
+ struct dm_target *tgt;
+ fmode_t mode;
+ int srcu_idx, r;
+
+ r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
+ if (r < 0)
+ return r;
+
+ ops = bdev->bd_disk->fops->pr_ops;
+ if (ops && ops->pr_register)
+ r = ops->pr_register(bdev, old_key, new_key, flags);
+ else
+ r = -EOPNOTSUPP;
+
+ dm_put_live_table(md, srcu_idx);
+ return r;
+}
+
+static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
+ u32 flags)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ const struct pr_ops *ops;
+ struct dm_target *tgt;
+ fmode_t mode;
+ int srcu_idx, r;
+
+ r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
+ if (r < 0)
+ return r;
+
+ ops = bdev->bd_disk->fops->pr_ops;
+ if (ops && ops->pr_reserve)
+ r = ops->pr_reserve(bdev, key, type, flags);
+ else
+ r = -EOPNOTSUPP;
+
+ dm_put_live_table(md, srcu_idx);
+ return r;
+}
+
+static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ const struct pr_ops *ops;
+ struct dm_target *tgt;
+ fmode_t mode;
+ int srcu_idx, r;
+
+ r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
+ if (r < 0)
+ return r;
+
+ ops = bdev->bd_disk->fops->pr_ops;
+ if (ops && ops->pr_release)
+ r = ops->pr_release(bdev, key, type);
+ else
+ r = -EOPNOTSUPP;
+
+ dm_put_live_table(md, srcu_idx);
+ return r;
+}
+
+static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
+ enum pr_type type, bool abort)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ const struct pr_ops *ops;
+ struct dm_target *tgt;
+ fmode_t mode;
+ int srcu_idx, r;
+
+ r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
+ if (r < 0)
+ return r;
+
+ ops = bdev->bd_disk->fops->pr_ops;
+ if (ops && ops->pr_preempt)
+ r = ops->pr_preempt(bdev, old_key, new_key, type, abort);
+ else
+ r = -EOPNOTSUPP;
+
+ dm_put_live_table(md, srcu_idx);
+ return r;
+}
+
+static int dm_pr_clear(struct block_device *bdev, u64 key)
+{
+ struct mapped_device *md = bdev->bd_disk->private_data;
+ const struct pr_ops *ops;
+ struct dm_target *tgt;
+ fmode_t mode;
+ int srcu_idx, r;
+
+ r = dm_get_live_table_for_ioctl(md, &tgt, &bdev, &mode, &srcu_idx);
+ if (r < 0)
+ return r;
+
+ ops = bdev->bd_disk->fops->pr_ops;
+ if (ops && ops->pr_clear)
+ r = ops->pr_clear(bdev, key);
+ else
+ r = -EOPNOTSUPP;
+
+ dm_put_live_table(md, srcu_idx);
+ return r;
+}
+
+static const struct pr_ops dm_pr_ops = {
+ .pr_register = dm_pr_register,
+ .pr_reserve = dm_pr_reserve,
+ .pr_release = dm_pr_release,
+ .pr_preempt = dm_pr_preempt,
+ .pr_clear = dm_pr_clear,
+};
+
static const struct block_device_operations dm_blk_dops = {
.open = dm_blk_open,
.release = dm_blk_close,
.ioctl = dm_blk_ioctl,
.getgeo = dm_blk_getgeo,
+ .pr_ops = &dm_pr_ops,
.owner = THIS_MODULE
};
projects / linux-2.6-block.git / blobdiff