*
* Description:
* Asynchronously issue a discard request for the sectors in question.
- * NOTE: this variant of blk-core's blkdev_issue_discard() is a stop-gap
- * that is being kept local to DM thinp until the block changes to allow
- * late bio splitting land upstream.
*/
static int __blkdev_issue_discard_async(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, unsigned long flags,
{
struct request_queue *q = bdev_get_queue(bdev);
int type = REQ_WRITE | REQ_DISCARD;
- unsigned int max_discard_sectors, granularity;
- int alignment;
struct bio *bio;
- int ret = 0;
- struct blk_plug plug;
- if (!q)
+ if (!q || !nr_sects)
return -ENXIO;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
- /* Zero-sector (unknown) and one-sector granularities are the same. */
- granularity = max(q->limits.discard_granularity >> 9, 1U);
- alignment = (bdev_discard_alignment(bdev) >> 9) % granularity;
-
- /*
- * Ensure that max_discard_sectors is of the proper
- * granularity, so that requests stay aligned after a split.
- */
- max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9);
- max_discard_sectors -= max_discard_sectors % granularity;
- if (unlikely(!max_discard_sectors)) {
- /* Avoid infinite loop below. Being cautious never hurts. */
- return -EOPNOTSUPP;
- }
-
if (flags & BLKDEV_DISCARD_SECURE) {
if (!blk_queue_secdiscard(q))
return -EOPNOTSUPP;
type |= REQ_SECURE;
}
- blk_start_plug(&plug);
- while (nr_sects) {
- unsigned int req_sects;
- sector_t end_sect, tmp;
-
- /*
- * Required bio_put occurs in bio_endio thanks to bio_chain below
- */
- bio = bio_alloc(gfp_mask, 1);
- if (!bio) {
- ret = -ENOMEM;
- break;
- }
-
- req_sects = min_t(sector_t, nr_sects, max_discard_sectors);
-
- /*
- * If splitting a request, and the next starting sector would be
- * misaligned, stop the discard at the previous aligned sector.
- */
- end_sect = sector + req_sects;
- tmp = end_sect;
- if (req_sects < nr_sects &&
- sector_div(tmp, granularity) != alignment) {
- end_sect = end_sect - alignment;
- sector_div(end_sect, granularity);
- end_sect = end_sect * granularity + alignment;
- req_sects = end_sect - sector;
- }
-
- bio_chain(bio, parent_bio);
+ /*
+ * Required bio_put occurs in bio_endio thanks to bio_chain below
+ */
+ bio = bio_alloc(gfp_mask, 1);
+ if (!bio)
+ return -ENOMEM;
- bio->bi_iter.bi_sector = sector;
- bio->bi_bdev = bdev;
+ bio_chain(bio, parent_bio);
- bio->bi_iter.bi_size = req_sects << 9;
- nr_sects -= req_sects;
- sector = end_sect;
+ bio->bi_iter.bi_sector = sector;
+ bio->bi_bdev = bdev;
+ bio->bi_iter.bi_size = nr_sects << 9;
- submit_bio(type, bio);
+ submit_bio(type, bio);
- /*
- * We can loop for a long time in here, if someone does
- * full device discards (like mkfs). Be nice and allow
- * us to schedule out to avoid softlocking if preempt
- * is disabled.
- */
- cond_resched();
- }
- blk_finish_plug(&plug);
-
- return ret;
+ return 0;
}
static bool block_size_is_power_of_two(struct pool *pool)
{
struct bio *bio;
- while ((bio = bio_list_pop(bios)))
- bio_endio(bio, error);
+ while ((bio = bio_list_pop(bios))) {
+ bio->bi_error = error;
+ bio_endio(bio);
+ }
}
static void error_thin_bio_list(struct thin_c *tc, struct bio_list *master, int error)
complete_mapping_preparation(m);
}
-static void overwrite_endio(struct bio *bio, int err)
+static void overwrite_endio(struct bio *bio)
{
struct dm_thin_endio_hook *h = dm_per_bio_data(bio, sizeof(struct dm_thin_endio_hook));
struct dm_thin_new_mapping *m = h->overwrite_mapping;
bio->bi_end_io = m->saved_bi_end_io;
- m->err = err;
+ m->err = bio->bi_error;
complete_mapping_preparation(m);
}
*/
if (bio) {
inc_remap_and_issue_cell(tc, m->cell, m->data_block);
- bio_endio(bio, 0);
+ bio_endio(bio);
} else {
inc_all_io_entry(tc->pool, m->cell->holder);
remap_and_issue(tc, m->cell->holder, m->data_block);
static void process_prepared_discard_success(struct dm_thin_new_mapping *m)
{
- bio_endio(m->bio, 0);
+ bio_endio(m->bio);
free_discard_mapping(m);
}
metadata_operation_failed(tc->pool, "dm_thin_remove_range", r);
bio_io_error(m->bio);
} else
- bio_endio(m->bio, 0);
+ bio_endio(m->bio);
cell_defer_no_holder(tc, m->cell);
mempool_free(m, tc->pool->mapping_pool);
* Even if r is set, there could be sub discards in flight that we
* need to wait for.
*/
- bio_endio(m->bio, r);
+ m->bio->bi_error = r;
+ bio_endio(m->bio);
cell_defer_no_holder(tc, m->cell);
mempool_free(m, pool->mapping_pool);
}
{
int error = should_error_unserviceable_bio(pool);
- if (error)
- bio_endio(bio, error);
- else
+ if (error) {
+ bio->bi_error = error;
+ bio_endio(bio);
+ } else
retry_on_resume(bio);
}
}
/*
- * FIXME: DM local hack to defer parent bios's end_io until we
- * _know_ all chained sub range discard bios have completed.
- * Will go away once late bio splitting lands upstream!
+ * __bio_inc_remaining() is used to defer parent bios's end_io until
+ * we _know_ all chained sub range discard bios have completed.
*/
static inline void __bio_inc_remaining(struct bio *bio)
{
* will prevent completion until the sub range discards have
* completed.
*/
- bio_endio(bio, 0);
+ bio_endio(bio);
}
static void process_discard_bio(struct thin_c *tc, struct bio *bio)
/*
* The discard covers less than a block.
*/
- bio_endio(bio, 0);
+ bio_endio(bio);
return;
}
if (bio_data_dir(bio) == READ) {
zero_fill_bio(bio);
cell_defer_no_holder(tc, cell);
- bio_endio(bio, 0);
+ bio_endio(bio);
return;
}
} else {
zero_fill_bio(bio);
- bio_endio(bio, 0);
+ bio_endio(bio);
}
} else
provision_block(tc, bio, block, cell);
}
zero_fill_bio(bio);
- bio_endio(bio, 0);
+ bio_endio(bio);
break;
default:
static void process_bio_success(struct thin_c *tc, struct bio *bio)
{
- bio_endio(bio, 0);
+ bio_endio(bio);
}
static void process_bio_fail(struct thin_c *tc, struct bio *bio)
thin_hook_bio(tc, bio);
if (tc->requeue_mode) {
- bio_endio(bio, DM_ENDIO_REQUEUE);
+ bio->bi_error = DM_ENDIO_REQUEUE;
+ bio_endio(bio);
return DM_MAPIO_SUBMITTED;
}
return fn(ti, pt->data_dev, 0, ti->len, data);
}
-static int pool_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
- struct bio_vec *biovec, int max_size)
-{
- struct pool_c *pt = ti->private;
- struct request_queue *q = bdev_get_queue(pt->data_dev->bdev);
-
- if (!q->merge_bvec_fn)
- return max_size;
-
- bvm->bi_bdev = pt->data_dev->bdev;
-
- return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
-}
-
static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits)
{
struct pool_c *pt = ti->private;
.resume = pool_resume,
.message = pool_message,
.status = pool_status,
- .merge = pool_merge,
.iterate_devices = pool_iterate_devices,
.io_hints = pool_io_hints,
};
DMEMIT("Error");
}
-static int thin_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
- struct bio_vec *biovec, int max_size)
-{
- struct thin_c *tc = ti->private;
- struct request_queue *q = bdev_get_queue(tc->pool_dev->bdev);
-
- if (!q->merge_bvec_fn)
- return max_size;
-
- bvm->bi_bdev = tc->pool_dev->bdev;
- bvm->bi_sector = dm_target_offset(ti, bvm->bi_sector);
-
- return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
-}
-
static int thin_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
{
struct thin_c *tc = ti->private;
struct pool *pool = tc->pool;
+ struct queue_limits *pool_limits = dm_get_queue_limits(pool->pool_md);
+
+ if (!pool_limits->discard_granularity)
+ return; /* pool's discard support is disabled */
limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;
limits->max_discard_sectors = 2048 * 1024 * 16; /* 16G */
.presuspend = thin_presuspend,
.postsuspend = thin_postsuspend,
.status = thin_status,
- .merge = thin_merge,
.iterate_devices = thin_iterate_devices,
.io_hints = thin_io_hints,
};
projects / linux-drm-fsl-dcu.git / blobdiff