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block: add a report_zones method

Browse source 
Dispatching a report zones command through the request queue is a major
pain due to the command reply payload rewriting necessary. Given that
blkdev_report_zones() is executing everything synchronously, implement
report zones as a block device file operation instead, allowing major
simplification of the code in many places.

sd, null-blk, dm-linear and dm-flakey being the only block device
drivers supporting exposing zoned block devices, these drivers are
modified to provide the device side implementation of the
report_zones() block device file operation.

For device mappers, a new report_zones() target type operation is
defined so that the upper block layer calls blkdev_report_zones() can
be propagated down to the underlying devices of the dm targets.
Implementation for this new operation is added to the dm-linear and
dm-flakey targets.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
[Damien]
* Changed method block_device argument to gendisk
* Various bug fixes and improvements
* Added support for null_blk, dm-linear and dm-flakey.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2018-10-12 19:08:49 +09:00 committed by Jens Axboe
parent 965b652e90
commit e76239a374
16 changed files with 270 additions and 429 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
block/blk-core.c
View file

@ -2300,7 +2300,6 @@ generic_make_request_checks(struct bio *bio)
if (!q->limits.max_write_same_sectors)
goto not_supported;
break;
case REQ_OP_ZONE_REPORT:
case REQ_OP_ZONE_RESET:
if (!blk_queue_is_zoned(q))
goto not_supported;

1
block/blk-mq-debugfs.c
View file

@ -283,7 +283,6 @@ static const char *const op_name[] = {
REQ_OP_NAME(WRITE),
REQ_OP_NAME(FLUSH),
REQ_OP_NAME(DISCARD),
REQ_OP_NAME(ZONE_REPORT),
REQ_OP_NAME(SECURE_ERASE),
REQ_OP_NAME(ZONE_RESET),
REQ_OP_NAME(WRITE_SAME),

164
block/blk-zoned.c
View file

@ -93,13 +93,10 @@ unsigned int blkdev_nr_zones(struct block_device *bdev)
EXPORT_SYMBOL_GPL(blkdev_nr_zones);
/*
* Check that a zone report belongs to the partition.
* If yes, fix its start sector and write pointer, copy it in the
* zone information array and return true. Return false otherwise.
* Check that a zone report belongs to this partition, and if yes, fix its start
* sector and write pointer and return true. Return false otherwise.
*/
static bool blkdev_report_zone(struct block_device *bdev,
struct blk_zone *rep,
struct blk_zone *zone)
static bool blkdev_report_zone(struct block_device *bdev, struct blk_zone *rep)
{
sector_t offset = get_start_sect(bdev);
@ -114,11 +111,36 @@ static bool blkdev_report_zone(struct block_device *bdev,
rep->wp = rep->start + rep->len;
else
rep->wp -= offset;
memcpy(zone, rep, sizeof(struct blk_zone));
return true;
}
static int blk_report_zones(struct gendisk *disk, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask)
{
struct request_queue *q = disk->queue;
unsigned int z = 0, n, nrz = *nr_zones;
sector_t capacity = get_capacity(disk);
int ret;
while (z < nrz && sector < capacity) {
n = nrz - z;
ret = disk->fops->report_zones(disk, sector, &zones[z], &n,
gfp_mask);
if (ret)
return ret;
if (!n)
break;
sector += blk_queue_zone_sectors(q) * n;
z += n;
}
WARN_ON(z > *nr_zones);
*nr_zones = z;
return 0;
}
/**
* blkdev_report_zones - Get zones information
* @bdev: Target block device
@ -133,130 +155,46 @@ static bool blkdev_report_zone(struct block_device *bdev,
* requested by @nr_zones. The number of zones actually reported is
* returned in @nr_zones.
*/
int blkdev_report_zones(struct block_device *bdev,
sector_t sector,
struct blk_zone *zones,
unsigned int *nr_zones,
int blkdev_report_zones(struct block_device *bdev, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask)
{
struct request_queue *q = bdev_get_queue(bdev);
struct blk_zone_report_hdr *hdr;
unsigned int nrz = *nr_zones;
struct page *page;
unsigned int nr_rep;
size_t rep_bytes;
unsigned int nr_pages;
struct bio *bio;
struct bio_vec *bv;
unsigned int i, n, nz;
unsigned int ofst;
void *addr;
unsigned int i, nrz;
int ret;
if (!q)
return -ENXIO;
if (!blk_queue_is_zoned(q))
return -EOPNOTSUPP;
if (!nrz)
return 0;
/*
* A block device that advertized itself as zoned must have a
* report_zones method. If it does not have one defined, the device
* driver has a bug. So warn about that.
*/
if (WARN_ON_ONCE(!bdev->bd_disk->fops->report_zones))
return -EOPNOTSUPP;
if (sector > bdev->bd_part->nr_sects) {
if (!*nr_zones || sector >= bdev->bd_part->nr_sects) {
*nr_zones = 0;
return 0;
}
/*
* The zone report has a header. So make room for it in the
* payload. Also make sure that the report fits in a single BIO
* that will not be split down the stack.
*/
rep_bytes = sizeof(struct blk_zone_report_hdr) +
sizeof(struct blk_zone) * nrz;
rep_bytes = (rep_bytes + PAGE_SIZE - 1) & PAGE_MASK;
if (rep_bytes > (queue_max_sectors(q) << 9))
rep_bytes = queue_max_sectors(q) << 9;
nr_pages = min_t(unsigned int, BIO_MAX_PAGES,
rep_bytes >> PAGE_SHIFT);
nr_pages = min_t(unsigned int, nr_pages,
queue_max_segments(q));
bio = bio_alloc(gfp_mask, nr_pages);
if (!bio)
return -ENOMEM;
bio_set_dev(bio, bdev);
bio->bi_iter.bi_sector = blk_zone_start(q, sector);
bio_set_op_attrs(bio, REQ_OP_ZONE_REPORT, 0);
for (i = 0; i < nr_pages; i++) {
page = alloc_page(gfp_mask);
if (!page) {
ret = -ENOMEM;
goto out;
}
if (!bio_add_page(bio, page, PAGE_SIZE, 0)) {
__free_page(page);
break;
}
}
if (i == 0)
ret = -ENOMEM;
else
ret = submit_bio_wait(bio);
nrz = min(*nr_zones,
__blkdev_nr_zones(q, bdev->bd_part->nr_sects - sector));
ret = blk_report_zones(bdev->bd_disk, get_start_sect(bdev) + sector,
zones, &nrz, gfp_mask);
if (ret)
goto out;
return ret;
/*
* Process the report result: skip the header and go through the
* reported zones to fixup and fixup the zone information for
* partitions. At the same time, return the zone information into
* the zone array.
*/
n = 0;
nz = 0;
nr_rep = 0;
bio_for_each_segment_all(bv, bio, i) {
if (!bv->bv_page)
for (i = 0; i < nrz; i++) {
if (!blkdev_report_zone(bdev, zones))
break;
addr = kmap_atomic(bv->bv_page);
/* Get header in the first page */
ofst = 0;
if (!nr_rep) {
hdr = addr;
nr_rep = hdr->nr_zones;
ofst = sizeof(struct blk_zone_report_hdr);
}
/* Fixup and report zones */
while (ofst < bv->bv_len &&
n < nr_rep && nz < nrz) {
if (blkdev_report_zone(bdev, addr + ofst, &zones[nz]))
nz++;
ofst += sizeof(struct blk_zone);
n++;
}
kunmap_atomic(addr);
if (n >= nr_rep || nz >= nrz)
break;
zones++;
}
*nr_zones = nz;
out:
bio_for_each_segment_all(bv, bio, i)
__free_page(bv->bv_page);
bio_put(bio);
*nr_zones = i;
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(blkdev_report_zones);

11
drivers/block/null_blk.h
View file

@ -87,7 +87,9 @@ struct nullb {
#ifdef CONFIG_BLK_DEV_ZONED
int null_zone_init(struct nullb_device *dev);
void null_zone_exit(struct nullb_device *dev);
blk_status_t null_zone_report(struct nullb *nullb, struct bio *bio);
int null_zone_report(struct gendisk *disk, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask);
void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
unsigned int nr_sectors);
void null_zone_reset(struct nullb_cmd *cmd, sector_t sector);
@ -97,10 +99,11 @@ static inline int null_zone_init(struct nullb_device *dev)
return -EINVAL;
}
static inline void null_zone_exit(struct nullb_device *dev) {}
static inline blk_status_t null_zone_report(struct nullb *nullb,
struct bio *bio)
static inline int null_zone_report(struct gendisk *disk, sector_t sector,
struct blk_zone *zones,
unsigned int *nr_zones, gfp_t gfp_mask)
{
return BLK_STS_NOTSUPP;
return -EOPNOTSUPP;
}
static inline void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
unsigned int nr_sectors)

23
drivers/block/null_blk_main.c
View file

@ -1129,34 +1129,12 @@ static void null_restart_queue_async(struct nullb *nullb)
blk_mq_start_stopped_hw_queues(q, true);
}
static bool cmd_report_zone(struct nullb *nullb, struct nullb_cmd *cmd)
{
struct nullb_device *dev = cmd->nq->dev;
if (dev->queue_mode == NULL_Q_BIO) {
if (bio_op(cmd->bio) == REQ_OP_ZONE_REPORT) {
cmd->error = null_zone_report(nullb, cmd->bio);
return true;
}
} else {
if (req_op(cmd->rq) == REQ_OP_ZONE_REPORT) {
cmd->error = null_zone_report(nullb, cmd->rq->bio);
return true;
}
}
return false;
}
static blk_status_t null_handle_cmd(struct nullb_cmd *cmd)
{
struct nullb_device *dev = cmd->nq->dev;
struct nullb *nullb = dev->nullb;
int err = 0;
if (cmd_report_zone(nullb, cmd))
goto out;
if (test_bit(NULLB_DEV_FL_THROTTLED, &dev->flags)) {
struct request *rq = cmd->rq;
@ -1443,6 +1421,7 @@ static const struct block_device_operations null_fops = {
.owner = THIS_MODULE,
.open = null_open,
.release = null_release,
.report_zones = null_zone_report,
};
static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq)

61
drivers/block/null_blk_zoned.c
View file

@ -48,54 +48,27 @@ void null_zone_exit(struct nullb_device *dev)
kvfree(dev->zones);
}
static void null_zone_fill_bio(struct nullb_device *dev, struct bio *bio,
unsigned int zno, unsigned int nr_zones)
{
struct blk_zone_report_hdr *hdr = NULL;
struct bio_vec bvec;
struct bvec_iter iter;
void *addr;
unsigned int zones_to_cpy;
bio_for_each_segment(bvec, bio, iter) {
addr = kmap_atomic(bvec.bv_page);
zones_to_cpy = bvec.bv_len / sizeof(struct blk_zone);
if (!hdr) {
hdr = (struct blk_zone_report_hdr *)addr;
hdr->nr_zones = nr_zones;
zones_to_cpy--;
addr += sizeof(struct blk_zone_report_hdr);
}
zones_to_cpy = min_t(unsigned int, zones_to_cpy, nr_zones);
memcpy(addr, &dev->zones[zno],
zones_to_cpy * sizeof(struct blk_zone));
kunmap_atomic(addr);
nr_zones -= zones_to_cpy;
zno += zones_to_cpy;
if (!nr_zones)
break;
}
}
blk_status_t null_zone_report(struct nullb *nullb, struct bio *bio)
int null_zone_report(struct gendisk *disk, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask)
{
struct nullb *nullb = disk->private_data;
struct nullb_device *dev = nullb->dev;
unsigned int zno = null_zone_no(dev, bio->bi_iter.bi_sector);
unsigned int nr_zones = dev->nr_zones - zno;
unsigned int max_zones;
unsigned int zno, nrz = 0;
max_zones = (bio->bi_iter.bi_size / sizeof(struct blk_zone)) - 1;
nr_zones = min_t(unsigned int, nr_zones, max_zones);
null_zone_fill_bio(nullb->dev, bio, zno, nr_zones);
if (!dev->zoned)
/* Not a zoned null device */
return -EOPNOTSUPP;
return BLK_STS_OK;
zno = null_zone_no(dev, sector);
if (zno < dev->nr_zones) {
nrz = min_t(unsigned int, *nr_zones, dev->nr_zones - zno);
memcpy(zones, &dev->zones[zno], nrz * sizeof(struct blk_zone));
}
*nr_zones = nrz;
return 0;
}
void null_zone_write(struct nullb_cmd *cmd, sector_t sector,

30
drivers/md/dm-flakey.c
View file

@ -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,

35
drivers/md/dm-linear.c
View file

@ -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

169
drivers/md/dm.c
View file

@ -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;
unsigned int nrz = *nr_zones;
int i;
/*
* 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.
* 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.
*/
part_offset = bio->bi_iter.bi_sector + ti->begin - (start + bio_end_sector(report_bio));
/*
* Remap the start sector of the reported zones. For sequential zones,
* also remap the write pointer position.
*/
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 (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;
}
if (hdr) {
hdr->nr_zones = nr_rep;
kunmap_atomic(hdr);
}
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
};

13
drivers/scsi/sd.c
View file

@ -1272,8 +1272,6 @@ static int sd_init_command(struct scsi_cmnd *cmd)
case REQ_OP_READ:
case REQ_OP_WRITE:
return sd_setup_read_write_cmnd(cmd);
case REQ_OP_ZONE_REPORT:
return sd_zbc_setup_report_cmnd(cmd);
case REQ_OP_ZONE_RESET:
return sd_zbc_setup_reset_cmnd(cmd);
default:
@ -1802,6 +1800,7 @@ static const struct block_device_operations sd_fops = {
.check_events = sd_check_events,
.revalidate_disk = sd_revalidate_disk,
.unlock_native_capacity = sd_unlock_native_capacity,
.report_zones = sd_zbc_report_zones,
.pr_ops = &sd_pr_ops,
};
@ -1953,16 +1952,6 @@ static int sd_done(struct scsi_cmnd *SCpnt)
scsi_set_resid(SCpnt, blk_rq_bytes(req));
}
break;
case REQ_OP_ZONE_REPORT:
if (!result) {
good_bytes = scsi_bufflen(SCpnt)
- scsi_get_resid(SCpnt);
scsi_set_resid(SCpnt, 0);
} else {
good_bytes = 0;
scsi_set_resid(SCpnt, blk_rq_bytes(req));
}
break;
default:
/*
* In case of bogus fw or device, we could end up having

11
drivers/scsi/sd.h
View file

@ -273,10 +273,12 @@ static inline int sd_is_zoned(struct scsi_disk *sdkp)
extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
extern void sd_zbc_remove(struct scsi_disk *sdkp);
extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
struct scsi_sense_hdr *sshdr);
extern int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask);
#else /* CONFIG_BLK_DEV_ZONED */
@ -290,11 +292,6 @@ static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
{
return BLKPREP_INVALID;
}
static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
{
return BLKPREP_INVALID;
@ -304,6 +301,8 @@ static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
unsigned int good_bytes,
struct scsi_sense_hdr *sshdr) {}
#define sd_zbc_report_zones NULL
#endif /* CONFIG_BLK_DEV_ZONED */
#endif /* _SCSI_DISK_H */

157
drivers/scsi/sd_zbc.c
View file

@ -62,7 +62,7 @@ static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
}
/**
* sd_zbc_report_zones - Issue a REPORT ZONES scsi command.
* sd_zbc_do_report_zones - Issue a REPORT ZONES scsi command.
* @sdkp: The target disk
* @buf: Buffer to use for the reply
* @buflen: the buffer size
@ -75,9 +75,9 @@ static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
* zones and will only report the count of zones fitting in the command reply
* buffer.
*/
static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
unsigned int buflen, sector_t lba,
bool partial)
static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
unsigned int buflen, sector_t lba,
bool partial)
{
struct scsi_device *sdp = sdkp->device;
const int timeout = sdp->request_queue->rq_timeout;
@ -118,108 +118,56 @@ static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
}
/**
* sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command
* @cmd: The command to setup
* sd_zbc_report_zones - Disk report zones operation.
* @disk: The target disk
* @sector: Start 512B sector of the report
* @zones: Array of zone descriptors
* @nr_zones: Number of descriptors in the array
* @gfp_mask: Memory allocation mask
*
* Call in sd_init_command() for a REQ_OP_ZONE_REPORT request.
* Execute a report zones command on the target disk.
*/
int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask)
{
struct request *rq = cmd->request;
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
sector_t lba, sector = blk_rq_pos(rq);
unsigned int nr_bytes = blk_rq_bytes(rq);
int ret;
WARN_ON(nr_bytes == 0);
struct scsi_disk *sdkp = scsi_disk(disk);
unsigned int i, buflen, nrz = *nr_zones;
unsigned char *buf;
size_t offset = 0;
int ret = 0;
if (!sd_is_zoned(sdkp))
/* Not a zoned device */
return BLKPREP_KILL;
return -EOPNOTSUPP;
ret = scsi_init_io(cmd);
if (ret != BLKPREP_OK)
return ret;
/*
* Get a reply buffer for the number of requested zones plus a header.
* For ATA, buffers must be aligned to 512B.
*/
buflen = roundup((nrz + 1) * 64, 512);
buf = kmalloc(buflen, gfp_mask);
if (!buf)
return -ENOMEM;
cmd->cmd_len = 16;
memset(cmd->cmnd, 0, cmd->cmd_len);
cmd->cmnd[0] = ZBC_IN;
cmd->cmnd[1] = ZI_REPORT_ZONES;
lba = sectors_to_logical(sdkp->device, sector);
put_unaligned_be64(lba, &cmd->cmnd[2]);
put_unaligned_be32(nr_bytes, &cmd->cmnd[10]);
/* Do partial report for speeding things up */
cmd->cmnd[14] = ZBC_REPORT_ZONE_PARTIAL;
cmd->sc_data_direction = DMA_FROM_DEVICE;
cmd->sdb.length = nr_bytes;
cmd->transfersize = sdkp->device->sector_size;
cmd->allowed = 0;
return BLKPREP_OK;
}
/**
* sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply.
* @scmd: The completed report zones command
* @good_bytes: reply size in bytes
*
* Convert all reported zone descriptors to struct blk_zone. The conversion
* is done in-place, directly in the request specified sg buffer.
*/
static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
unsigned int good_bytes)
{
struct request *rq = scmd->request;
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
struct sg_mapping_iter miter;
struct blk_zone_report_hdr hdr;
struct blk_zone zone;
unsigned int offset, bytes = 0;
unsigned long flags;
u8 *buf;
if (good_bytes < 64)
return;
memset(&hdr, 0, sizeof(struct blk_zone_report_hdr));
sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
SG_MITER_TO_SG | SG_MITER_ATOMIC);
local_irq_save(flags);
while (sg_miter_next(&miter) && bytes < good_bytes) {
buf = miter.addr;
offset = 0;
if (bytes == 0) {
/* Set the report header */
hdr.nr_zones = min_t(unsigned int,
(good_bytes - 64) / 64,
get_unaligned_be32(&buf[0]) / 64);
memcpy(buf, &hdr, sizeof(struct blk_zone_report_hdr));
offset += 64;
bytes += 64;
}
/* Parse zone descriptors */
while (offset < miter.length && hdr.nr_zones) {
WARN_ON(offset > miter.length);
buf = miter.addr + offset;
sd_zbc_parse_report(sdkp, buf, &zone);
memcpy(buf, &zone, sizeof(struct blk_zone));
offset += 64;
bytes += 64;
hdr.nr_zones--;
}
if (!hdr.nr_zones)
break;
ret = sd_zbc_do_report_zones(sdkp, buf, buflen,
sectors_to_logical(sdkp->device, sector), true);
if (ret)
goto out_free_buf;
nrz = min(nrz, get_unaligned_be32(&buf[0]) / 64);
for (i = 0; i < nrz; i++) {
offset += 64;
sd_zbc_parse_report(sdkp, buf + offset, zones);
zones++;
}
sg_miter_stop(&miter);
local_irq_restore(flags);
*nr_zones = nrz;
out_free_buf:
kfree(buf);
return ret;
}
/**
@ -302,13 +250,6 @@ void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
case REQ_OP_WRITE_ZEROES:
case REQ_OP_WRITE_SAME:
break;
case REQ_OP_ZONE_REPORT:
if (!result)
sd_zbc_report_zones_complete(cmd, good_bytes);
break;
}
}
@ -390,7 +331,7 @@ static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks)
return -ENOMEM;
/* Do a report zone to get max_lba and the same field */
ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0, false);
ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0, false);
if (ret)
goto out_free;
@ -447,8 +388,8 @@ static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks)
}
if (block < sdkp->capacity) {
ret = sd_zbc_report_zones(sdkp, buf,
SD_ZBC_BUF_SIZE, block, true);
ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
block, true);
if (ret)
goto out_free;
}
@ -565,8 +506,8 @@ sd_zbc_setup_seq_zones_bitmap(struct scsi_disk *sdkp, u32 zone_shift,
goto out;
while (lba < sdkp->capacity) {
ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
lba, true);
ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, lba,
true);
if (ret)
goto out;
lba = sd_zbc_get_seq_zones(sdkp, buf, SD_ZBC_BUF_SIZE,

2
include/linux/blk_types.h
View file

@ -283,8 +283,6 @@ enum req_opf {
REQ_OP_FLUSH = 2,
/* discard sectors */
REQ_OP_DISCARD = 3,
/* get zone information */
REQ_OP_ZONE_REPORT = 4,
/* securely erase sectors */
REQ_OP_SECURE_ERASE = 5,
/* seset a zone write pointer */

8
include/linux/blkdev.h
View file

@ -396,11 +396,6 @@ struct queue_limits {
#ifdef CONFIG_BLK_DEV_ZONED
struct blk_zone_report_hdr {
unsigned int nr_zones;
u8 padding[60];
};
extern unsigned int blkdev_nr_zones(struct block_device *bdev);
extern int blkdev_report_zones(struct block_device *bdev,
sector_t sector, struct blk_zone *zones,
@ -1867,6 +1862,9 @@ struct block_device_operations {
int (*getgeo)(struct block_device *, struct hd_geometry *);
/* this callback is with swap_lock and sometimes page table lock held */
void (*swap_slot_free_notify) (struct block_device *, unsigned long);
int (*report_zones)(struct gendisk *, sector_t sector,
struct blk_zone *zones, unsigned int *nr_zones,
gfp_t gfp_mask);
struct module *owner;
const struct pr_ops *pr_ops;
};

12
include/linux/device-mapper.h
View file

@ -92,6 +92,11 @@ typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv,
typedef int (*dm_prepare_ioctl_fn) (struct dm_target *ti, struct block_device **bdev);
typedef int (*dm_report_zones_fn) (struct dm_target *ti, sector_t sector,
struct blk_zone *zones,
unsigned int *nr_zones,
gfp_t gfp_mask);
/*
* These iteration functions are typically used to check (and combine)
* properties of underlying devices.
@ -180,6 +185,9 @@ struct target_type {
dm_status_fn status;
dm_message_fn message;
dm_prepare_ioctl_fn prepare_ioctl;
#ifdef CONFIG_BLK_DEV_ZONED
dm_report_zones_fn report_zones;
#endif
dm_busy_fn busy;
dm_iterate_devices_fn iterate_devices;
dm_io_hints_fn io_hints;
@ -420,8 +428,8 @@ struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct dm_target *ti);
int dm_noflush_suspending(struct dm_target *ti);
void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors);
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);
union map_info *dm_get_rq_mapinfo(struct request *rq);
struct queue_limits *dm_get_queue_limits(struct mapped_device *md);

1
include/trace/events/f2fs.h
View file

@ -82,7 +82,6 @@ TRACE_DEFINE_ENUM(CP_TRIMMED);
{ REQ_OP_WRITE, "WRITE" }, \
{ REQ_OP_FLUSH, "FLUSH" }, \
{ REQ_OP_DISCARD, "DISCARD" }, \
{ REQ_OP_ZONE_REPORT, "ZONE_REPORT" }, \
{ REQ_OP_SECURE_ERASE, "SECURE_ERASE" }, \
{ REQ_OP_ZONE_RESET, "ZONE_RESET" }, \
{ REQ_OP_WRITE_SAME, "WRITE_SAME" }, \