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block: add a report_zones method 

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
Show 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" }, \