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authorLinus Torvalds <torvalds@linux-foundation.org>2018-10-26 12:43:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-26 12:43:13 -0700
commit6080ad3a9941e4707bb929445b813fadca9a27ff (patch)
tree1a67692494cbbeee8ddc988c81903fde8876be99 /drivers/md
parentb27186abb37b7bd19e0ca434f4f425c807dbd708 (diff)
parenta435ab4f80f983c53b4ca4f8c12b3ddd3ca17670 (diff)
Merge tag 'for-linus-20181026' of git://git.kernel.dk/linux-block
Pull more block layer updates from Jens Axboe: - Set of patches improving support for zoned devices. This was ready before the merge window, but I was late in picking it up and hence it missed the original pull request (Damien, Christoph) - libata no link power management quirk addition for a Samsung drive (Diego Viola) - Fix for a performance regression in BFQ that went into this merge window (Federico Motta) - Fix for a missing dma mask setting return value check (Gustavo) - Typo in the gdrom queue failure case (me) - NULL pointer deref fix for xen-blkfront (Vasilis Liaskovitis) - Fixing the get_rq trace point placement in blk-mq (Xiaoguang Wang) - Removal of a set-but-not-read variable in cdrom (zhong jiang) * tag 'for-linus-20181026' of git://git.kernel.dk/linux-block: libata: Apply NOLPM quirk for SAMSUNG MZ7TD256HAFV-000L9 block, bfq: fix asymmetric scenarios detection gdrom: fix mistake in assignment of error blk-mq: place trace_block_getrq() in correct place block: Introduce blk_revalidate_disk_zones() block: add a report_zones method block: Expose queue nr_zones in sysfs block: Improve zone reset execution block: Introduce BLKGETNRZONES ioctl block: Introduce BLKGETZONESZ ioctl block: Limit allocation of zone descriptors for report zones block: Introduce blkdev_nr_zones() helper scsi: sd_zbc: Fix sd_zbc_check_zones() error checks scsi: sd_zbc: Reduce boot device scan and revalidate time scsi: sd_zbc: Rearrange code cdrom: remove set but not used variable 'tocuse' skd: fix unchecked return values xen/blkfront: avoid NULL blkfront_info dereference on device removal
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-flakey.c30
-rw-r--r--drivers/md/dm-linear.c35
-rw-r--r--drivers/md/dm-table.c10
-rw-r--r--drivers/md/dm-zoned-target.c3
-rw-r--r--drivers/md/dm.c169
5 files changed, 137 insertions, 110 deletions
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 32aabe27b37c..3cb97fa4c11d 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -315,10 +315,6 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
if (bio_op(bio) == REQ_OP_ZONE_RESET)
goto map_bio;
- /* We need to remap reported zones, so remember the BIO iter */
- if (bio_op(bio) == REQ_OP_ZONE_REPORT)
- goto map_bio;
-
/* Are we alive ? */
elapsed = (jiffies - fc->start_time) / HZ;
if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval) {
@@ -380,11 +376,6 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio,
if (bio_op(bio) == REQ_OP_ZONE_RESET)
return DM_ENDIO_DONE;
- if (bio_op(bio) == REQ_OP_ZONE_REPORT) {
- dm_remap_zone_report(ti, bio, fc->start);
- return DM_ENDIO_DONE;
- }
-
if (!*error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc)) {
@@ -457,6 +448,26 @@ static int flakey_prepare_ioctl(struct dm_target *ti, struct block_device **bdev
return 0;
}
+#ifdef CONFIG_BLK_DEV_ZONED
+static int flakey_report_zones(struct dm_target *ti, sector_t sector,
+ struct blk_zone *zones, unsigned int *nr_zones,
+ gfp_t gfp_mask)
+{
+ struct flakey_c *fc = ti->private;
+ int ret;
+
+ /* Do report and remap it */
+ ret = blkdev_report_zones(fc->dev->bdev, flakey_map_sector(ti, sector),
+ zones, nr_zones, gfp_mask);
+ if (ret != 0)
+ return ret;
+
+ if (*nr_zones)
+ dm_remap_zone_report(ti, fc->start, zones, nr_zones);
+ return 0;
+}
+#endif
+
static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_fn fn, void *data)
{
struct flakey_c *fc = ti->private;
@@ -469,6 +480,7 @@ static struct target_type flakey_target = {
.version = {1, 5, 0},
#ifdef CONFIG_BLK_DEV_ZONED
.features = DM_TARGET_ZONED_HM,
+ .report_zones = flakey_report_zones,
#endif
.module = THIS_MODULE,
.ctr = flakey_ctr,
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 2f7c44a006c4..8d7ddee6ac4d 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -102,19 +102,6 @@ static int linear_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_REMAPPED;
}
-#ifdef CONFIG_BLK_DEV_ZONED
-static int linear_end_io(struct dm_target *ti, struct bio *bio,
- blk_status_t *error)
-{
- struct linear_c *lc = ti->private;
-
- if (!*error && bio_op(bio) == REQ_OP_ZONE_REPORT)
- dm_remap_zone_report(ti, bio, lc->start);
-
- return DM_ENDIO_DONE;
-}
-#endif
-
static void linear_status(struct dm_target *ti, status_type_t type,
unsigned status_flags, char *result, unsigned maxlen)
{
@@ -148,6 +135,26 @@ static int linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev
return 0;
}
+#ifdef CONFIG_BLK_DEV_ZONED
+static int linear_report_zones(struct dm_target *ti, sector_t sector,
+ struct blk_zone *zones, unsigned int *nr_zones,
+ gfp_t gfp_mask)
+{
+ struct linear_c *lc = (struct linear_c *) ti->private;
+ int ret;
+
+ /* Do report and remap it */
+ ret = blkdev_report_zones(lc->dev->bdev, linear_map_sector(ti, sector),
+ zones, nr_zones, gfp_mask);
+ if (ret != 0)
+ return ret;
+
+ if (*nr_zones)
+ dm_remap_zone_report(ti, lc->start, zones, nr_zones);
+ return 0;
+}
+#endif
+
static int linear_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
@@ -211,8 +218,8 @@ static struct target_type linear_target = {
.name = "linear",
.version = {1, 4, 0},
#ifdef CONFIG_BLK_DEV_ZONED
- .end_io = linear_end_io,
.features = DM_TARGET_PASSES_INTEGRITY | DM_TARGET_ZONED_HM,
+ .report_zones = linear_report_zones,
#else
.features = DM_TARGET_PASSES_INTEGRITY,
#endif
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 3d0e2c198f06..fb4bea20657b 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1937,6 +1937,16 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
*/
if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random))
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
+
+ /*
+ * For a zoned target, the number of zones should be updated for the
+ * correct value to be exposed in sysfs queue/nr_zones. For a BIO based
+ * target, this is all that is needed. For a request based target, the
+ * queue zone bitmaps must also be updated.
+ * Use blk_revalidate_disk_zones() to handle this.
+ */
+ if (blk_queue_is_zoned(q))
+ blk_revalidate_disk_zones(t->md->disk);
}
unsigned int dm_table_get_num_targets(struct dm_table *t)
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index a44183ff4be0..12d96a263623 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -702,8 +702,7 @@ static int dmz_get_zoned_device(struct dm_target *ti, char *path)
dev->zone_nr_blocks = dmz_sect2blk(dev->zone_nr_sectors);
dev->zone_nr_blocks_shift = ilog2(dev->zone_nr_blocks);
- dev->nr_zones = (dev->capacity + dev->zone_nr_sectors - 1)
- >> dev->zone_nr_sectors_shift;
+ dev->nr_zones = blkdev_nr_zones(dev->bdev);
dmz->dev = dev;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 45abb54037fc..6be21dc210a1 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -458,6 +458,57 @@ static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
return dm_get_geometry(md, geo);
}
+static int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
+ struct blk_zone *zones, unsigned int *nr_zones,
+ gfp_t gfp_mask)
+{
+#ifdef CONFIG_BLK_DEV_ZONED
+ struct mapped_device *md = disk->private_data;
+ struct dm_target *tgt;
+ struct dm_table *map;
+ int srcu_idx, ret;
+
+ if (dm_suspended_md(md))
+ return -EAGAIN;
+
+ map = dm_get_live_table(md, &srcu_idx);
+ if (!map)
+ return -EIO;
+
+ tgt = dm_table_find_target(map, sector);
+ if (!dm_target_is_valid(tgt)) {
+ ret = -EIO;
+ goto out;
+ }
+
+ /*
+ * If we are executing this, we already know that the block device
+ * is a zoned device and so each target should have support for that
+ * type of drive. A missing report_zones method means that the target
+ * driver has a problem.
+ */
+ if (WARN_ON(!tgt->type->report_zones)) {
+ ret = -EIO;
+ goto out;
+ }
+
+ /*
+ * blkdev_report_zones() will loop and call this again to cover all the
+ * zones of the target, eventually moving on to the next target.
+ * So there is no need to loop here trying to fill the entire array
+ * of zones.
+ */
+ ret = tgt->type->report_zones(tgt, sector, zones,
+ nr_zones, gfp_mask);
+
+out:
+ dm_put_live_table(md, srcu_idx);
+ return ret;
+#else
+ return -ENOTSUPP;
+#endif
+}
+
static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx,
struct block_device **bdev)
__acquires(md->io_barrier)
@@ -1155,93 +1206,49 @@ void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
/*
- * The zone descriptors obtained with a zone report indicate zone positions
- * within the target backing device, regardless of that device is a partition
- * and regardless of the target mapping start sector on the device or partition.
- * The zone descriptors start sector and write pointer position must be adjusted
- * to match their relative position within the dm device.
- * A target may call dm_remap_zone_report() after completion of a
- * REQ_OP_ZONE_REPORT bio to remap the zone descriptors obtained from the
- * backing device.
+ * The zone descriptors obtained with a zone report indicate
+ * zone positions within the underlying device of the target. The zone
+ * descriptors must be remapped to match their position within the dm device.
+ * The caller target should obtain the zones information using
+ * blkdev_report_zones() to ensure that remapping for partition offset is
+ * already handled.
*/
-void dm_remap_zone_report(struct dm_target *ti, struct bio *bio, sector_t start)
+void dm_remap_zone_report(struct dm_target *ti, sector_t start,
+ struct blk_zone *zones, unsigned int *nr_zones)
{
#ifdef CONFIG_BLK_DEV_ZONED
- struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
- struct bio *report_bio = tio->io->orig_bio;
- struct blk_zone_report_hdr *hdr = NULL;
struct blk_zone *zone;
- unsigned int nr_rep = 0;
- unsigned int ofst;
- sector_t part_offset;
- struct bio_vec bvec;
- struct bvec_iter iter;
- void *addr;
-
- if (bio->bi_status)
- return;
-
- /*
- * bio sector was incremented by the request size on completion. Taking
- * into account the original request sector, the target start offset on
- * the backing device and the target mapping offset (ti->begin), the
- * start sector of the backing device. The partition offset is always 0
- * if the target uses a whole device.
- */
- part_offset = bio->bi_iter.bi_sector + ti->begin - (start + bio_end_sector(report_bio));
+ unsigned int nrz = *nr_zones;
+ int i;
/*
- * Remap the start sector of the reported zones. For sequential zones,
- * also remap the write pointer position.
+ * Remap the start sector and write pointer position of the zones in
+ * the array. Since we may have obtained from the target underlying
+ * device more zones that the target size, also adjust the number
+ * of zones.
*/
- bio_for_each_segment(bvec, report_bio, iter) {
- addr = kmap_atomic(bvec.bv_page);
-
- /* Remember the report header in the first page */
- if (!hdr) {
- hdr = addr;
- ofst = sizeof(struct blk_zone_report_hdr);
- } else
- ofst = 0;
-
- /* Set zones start sector */
- while (hdr->nr_zones && ofst < bvec.bv_len) {
- zone = addr + ofst;
- zone->start -= part_offset;
- if (zone->start >= start + ti->len) {
- hdr->nr_zones = 0;
- break;
- }
- zone->start = zone->start + ti->begin - start;
- if (zone->type != BLK_ZONE_TYPE_CONVENTIONAL) {
- if (zone->cond == BLK_ZONE_COND_FULL)
- zone->wp = zone->start + zone->len;
- else if (zone->cond == BLK_ZONE_COND_EMPTY)
- zone->wp = zone->start;
- else
- zone->wp = zone->wp + ti->begin - start - part_offset;
- }
- ofst += sizeof(struct blk_zone);
- hdr->nr_zones--;
- nr_rep++;
+ for (i = 0; i < nrz; i++) {
+ zone = zones + i;
+ if (zone->start >= start + ti->len) {
+ memset(zone, 0, sizeof(struct blk_zone) * (nrz - i));
+ break;
}
- if (addr != hdr)
- kunmap_atomic(addr);
+ zone->start = zone->start + ti->begin - start;
+ if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
+ continue;
- if (!hdr->nr_zones)
- break;
- }
-
- if (hdr) {
- hdr->nr_zones = nr_rep;
- kunmap_atomic(hdr);
+ if (zone->cond == BLK_ZONE_COND_FULL)
+ zone->wp = zone->start + zone->len;
+ else if (zone->cond == BLK_ZONE_COND_EMPTY)
+ zone->wp = zone->start;
+ else
+ zone->wp = zone->wp + ti->begin - start;
}
- bio_advance(report_bio, report_bio->bi_iter.bi_size);
-
+ *nr_zones = i;
#else /* !CONFIG_BLK_DEV_ZONED */
- bio->bi_status = BLK_STS_NOTSUPP;
+ *nr_zones = 0;
#endif
}
EXPORT_SYMBOL_GPL(dm_remap_zone_report);
@@ -1327,8 +1334,7 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
return r;
}
- if (bio_op(bio) != REQ_OP_ZONE_REPORT)
- bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
+ bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
clone->bi_iter.bi_size = to_bytes(len);
if (unlikely(bio_integrity(bio) != NULL))
@@ -1541,7 +1547,6 @@ static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
*/
static int __split_and_process_non_flush(struct clone_info *ci)
{
- struct bio *bio = ci->bio;
struct dm_target *ti;
unsigned len;
int r;
@@ -1553,11 +1558,7 @@ static int __split_and_process_non_flush(struct clone_info *ci)
if (unlikely(__process_abnormal_io(ci, ti, &r)))
return r;
- if (bio_op(bio) == REQ_OP_ZONE_REPORT)
- len = ci->sector_count;
- else
- len = min_t(sector_t, max_io_len(ci->sector, ti),
- ci->sector_count);
+ len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count);
r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);
if (r < 0)
@@ -1616,9 +1617,6 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
* We take a clone of the original to store in
* ci.io->orig_bio to be used by end_io_acct() and
* for dec_pending to use for completion handling.
- * As this path is not used for REQ_OP_ZONE_REPORT,
- * the usage of io->orig_bio in dm_remap_zone_report()
- * won't be affected by this reassignment.
*/
struct bio *b = bio_split(bio, bio_sectors(bio) - ci.sector_count,
GFP_NOIO, &md->queue->bio_split);
@@ -3167,6 +3165,7 @@ static const struct block_device_operations dm_blk_dops = {
.release = dm_blk_close,
.ioctl = dm_blk_ioctl,
.getgeo = dm_blk_getgeo,
+ .report_zones = dm_blk_report_zones,
.pr_ops = &dm_pr_ops,
.owner = THIS_MODULE
};