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block: remove QUEUE_FLAG_DISCARD

Browse source 
Just use a non-zero max_discard_sectors as an indicator for discard
support, similar to what is done for write zeroes.

The only places where needs special attention is the RAID5 driver,
which must clear discard support for security reasons by default,
even if the default stacking rules would allow for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd]
Acked-by: Jan Höppner <hoeppner@linux.ibm.com> [s390]
Acked-by: Coly Li <colyli@suse.de> [bcache]
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220415045258.199825-25-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-04-15 06:52:55 +02:00 committed by Jens Axboe
parent cf0fbf894b
commit 70200574cc
61 changed files with 73 additions and 244 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/um/drivers/ubd_kern.c
View file

@ -483,7 +483,6 @@ static void ubd_handler(void)
if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
blk_queue_max_discard_sectors(io_req->req->q, 0);
blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);
}
blk_mq_end_request(io_req->req, io_req->error);
kfree(io_req);
@ -803,7 +802,6 @@ static int ubd_open_dev(struct ubd *ubd_dev)
ubd_dev->queue->limits.discard_alignment = SECTOR_SIZE;
blk_queue_max_discard_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
blk_queue_max_write_zeroes_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, ubd_dev->queue);
}
blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);
return 0;

2
block/blk-core.c
View file

@ -820,7 +820,7 @@ void submit_bio_noacct(struct bio *bio)
switch (bio_op(bio)) {
case REQ_OP_DISCARD:
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(bdev))
goto not_supported;
break;
case REQ_OP_SECURE_ERASE:

2
block/blk-lib.c
View file

@ -53,7 +53,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
return -EOPNOTSUPP;
op = REQ_OP_SECURE_ERASE;
} else {
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(bdev))
return -EOPNOTSUPP;
op = REQ_OP_DISCARD;
}

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

@ -113,7 +113,6 @@ static const char *const blk_queue_flag_name[] = {
QUEUE_FLAG_NAME(FAIL_IO),
QUEUE_FLAG_NAME(NONROT),
QUEUE_FLAG_NAME(IO_STAT),
QUEUE_FLAG_NAME(DISCARD),
QUEUE_FLAG_NAME(NOXMERGES),
QUEUE_FLAG_NAME(ADD_RANDOM),
QUEUE_FLAG_NAME(SECERASE),

3
block/ioctl.c
View file

@ -87,14 +87,13 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
{
uint64_t range[2];
uint64_t start, len;
struct request_queue *q = bdev_get_queue(bdev);
struct inode *inode = bdev->bd_inode;
int err;
if (!(mode & FMODE_WRITE))
return -EBADF;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(bdev))
return -EOPNOTSUPP;
if (copy_from_user(range, (void __user *)arg, sizeof(range)))

2
drivers/block/drbd/drbd_main.c
View file

@ -942,7 +942,7 @@ int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enu
cpu_to_be32(bdev_alignment_offset(bdev));
p->qlim->io_min = cpu_to_be32(bdev_io_min(bdev));
p->qlim->io_opt = cpu_to_be32(bdev_io_opt(bdev));
p->qlim->discard_enabled = blk_queue_discard(q);
p->qlim->discard_enabled = !!bdev_max_discard_sectors(bdev);
put_ldev(device);
} else {
struct request_queue *q = device->rq_queue;

19
drivers/block/drbd/drbd_nl.c
View file

@ -1210,7 +1210,7 @@ static void decide_on_discard_support(struct drbd_device *device,
first_peer_device(device)->connection;
struct request_queue *q = device->rq_queue;
if (bdev && !blk_queue_discard(bdev->backing_bdev->bd_disk->queue))
if (bdev && !bdev_max_discard_sectors(bdev->backing_bdev))
goto not_supported;
if (connection->cstate >= C_CONNECTED &&
@ -1230,30 +1230,16 @@ static void decide_on_discard_support(struct drbd_device *device,
*/
blk_queue_discard_granularity(q, 512);
q->limits.max_discard_sectors = drbd_max_discard_sectors(connection);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
q->limits.max_write_zeroes_sectors =
drbd_max_discard_sectors(connection);
return;
not_supported:
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
blk_queue_discard_granularity(q, 0);
q->limits.max_discard_sectors = 0;
q->limits.max_write_zeroes_sectors = 0;
}
static void fixup_discard_if_not_supported(struct request_queue *q)
{
/* To avoid confusion, if this queue does not support discard, clear
* max_discard_sectors, which is what lsblk -D reports to the user.
* Older kernels got this wrong in "stack limits".
* */
if (!blk_queue_discard(q)) {
blk_queue_max_discard_sectors(q, 0);
blk_queue_discard_granularity(q, 0);
}
}
static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q)
{
/* Fixup max_write_zeroes_sectors after blk_stack_limits():
@ -1300,7 +1286,6 @@ static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backi
blk_stack_limits(&q->limits, &b->limits, 0);
disk_update_readahead(device->vdisk);
}
fixup_discard_if_not_supported(q);
fixup_write_zeroes(device, q);
}
@ -1447,7 +1432,7 @@ static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *dis
if (disk_conf->al_extents > drbd_al_extents_max(nbc))
disk_conf->al_extents = drbd_al_extents_max(nbc);
if (!blk_queue_discard(q)) {
if (!bdev_max_discard_sectors(bdev)) {
if (disk_conf->rs_discard_granularity) {
disk_conf->rs_discard_granularity = 0; /* disable feature */
drbd_info(device, "rs_discard_granularity feature disabled\n");

3
drivers/block/drbd/drbd_receiver.c
View file

@ -1575,11 +1575,10 @@ int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, u
static bool can_do_reliable_discards(struct drbd_device *device)
{
struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
struct disk_conf *dc;
bool can_do;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(device->ldev->backing_bdev))
return false;
rcu_read_lock();

11
drivers/block/loop.c
View file

@ -314,15 +314,12 @@ static int lo_fallocate(struct loop_device *lo, struct request *rq, loff_t pos,
mode |= FALLOC_FL_KEEP_SIZE;
if (!blk_queue_discard(lo->lo_queue)) {
ret = -EOPNOTSUPP;
goto out;
}
if (!bdev_max_discard_sectors(lo->lo_device))
return -EOPNOTSUPP;
ret = file->f_op->fallocate(file, mode, pos, blk_rq_bytes(rq));
if (unlikely(ret && ret != -EINVAL && ret != -EOPNOTSUPP))
ret = -EIO;
out:
return -EIO;
return ret;
}
@ -787,12 +784,10 @@ static void loop_config_discard(struct loop_device *lo)
q->limits.discard_granularity = granularity;
blk_queue_max_discard_sectors(q, max_discard_sectors);
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
} else {
q->limits.discard_granularity = 0;
blk_queue_max_discard_sectors(q, 0);
blk_queue_max_write_zeroes_sectors(q, 0);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
}
q->limits.discard_alignment = 0;
}

5
drivers/block/nbd.c
View file

@ -1231,8 +1231,6 @@ static void nbd_parse_flags(struct nbd_device *nbd)
set_disk_ro(nbd->disk, true);
else
set_disk_ro(nbd->disk, false);
if (config->flags & NBD_FLAG_SEND_TRIM)
blk_queue_flag_set(QUEUE_FLAG_DISCARD, nbd->disk->queue);
if (config->flags & NBD_FLAG_SEND_FLUSH) {
if (config->flags & NBD_FLAG_SEND_FUA)
blk_queue_write_cache(nbd->disk->queue, true, true);
@ -1319,8 +1317,7 @@ static void nbd_config_put(struct nbd_device *nbd)
nbd->tag_set.timeout = 0;
nbd->disk->queue->limits.discard_granularity = 0;
nbd->disk->queue->limits.discard_alignment = 0;
blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, nbd->disk->queue);
blk_queue_max_discard_sectors(nbd->disk->queue, 0);
mutex_unlock(&nbd->config_lock);
nbd_put(nbd);

1
drivers/block/null_blk/main.c
View file

@ -1767,7 +1767,6 @@ static void null_config_discard(struct nullb *nullb)
nullb->q->limits.discard_granularity = nullb->dev->blocksize;
nullb->q->limits.discard_alignment = nullb->dev->blocksize;
blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q);
}
static const struct block_device_operations null_bio_ops = {

1
drivers/block/rbd.c
View file

@ -4942,7 +4942,6 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
blk_queue_io_opt(q, rbd_dev->opts->alloc_size);
if (rbd_dev->opts->trim) {
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
q->limits.discard_granularity = rbd_dev->opts->alloc_size;
blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT);
blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT);

2
drivers/block/rnbd/rnbd-clt.c
View file

@ -1364,8 +1364,6 @@ static void setup_request_queue(struct rnbd_clt_dev *dev)
blk_queue_max_discard_sectors(dev->queue, dev->max_discard_sectors);
dev->queue->limits.discard_granularity = dev->discard_granularity;
dev->queue->limits.discard_alignment = dev->discard_alignment;
if (dev->max_discard_sectors)
blk_queue_flag_set(QUEUE_FLAG_DISCARD, dev->queue);
if (dev->secure_discard)
blk_queue_flag_set(QUEUE_FLAG_SECERASE, dev->queue);

3
drivers/block/rnbd/rnbd-srv-dev.h
View file

@ -49,9 +49,6 @@ static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
{
if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
return 0;
return bdev_max_discard_sectors(dev->bdev);
}

2
drivers/block/virtio_blk.c
View file

@ -888,8 +888,6 @@ static int virtblk_probe(struct virtio_device *vdev)
v = sg_elems;
blk_queue_max_discard_segments(q,
min(v, MAX_DISCARD_SEGMENTS));
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
}
if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) {

2
drivers/block/xen-blkback/xenbus.c
View file

@ -583,7 +583,7 @@ static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info
if (!xenbus_read_unsigned(dev->nodename, "discard-enable", 1))
return;
if (blk_queue_discard(q)) {
if (bdev_max_discard_sectors(bdev)) {
err = xenbus_printf(xbt, dev->nodename,
"discard-granularity", "%u",
q->limits.discard_granularity);

3
drivers/block/xen-blkfront.c
View file

@ -944,7 +944,6 @@ static void blkif_set_queue_limits(struct blkfront_info *info)
blk_queue_flag_set(QUEUE_FLAG_VIRT, rq);
if (info->feature_discard) {
blk_queue_flag_set(QUEUE_FLAG_DISCARD, rq);
blk_queue_max_discard_sectors(rq, get_capacity(gd));
rq->limits.discard_granularity = info->discard_granularity ?:
info->physical_sector_size;
@ -1606,7 +1605,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
blkif_req(req)->error = BLK_STS_NOTSUPP;
info->feature_discard = 0;
info->feature_secdiscard = 0;
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, rq);
blk_queue_max_discard_sectors(rq, 0);
blk_queue_flag_clear(QUEUE_FLAG_SECERASE, rq);
}
break;

1
drivers/block/zram/zram_drv.c
View file

@ -1952,7 +1952,6 @@ static int zram_add(void)
blk_queue_io_opt(zram->disk->queue, PAGE_SIZE);
zram->disk->queue->limits.discard_granularity = PAGE_SIZE;
blk_queue_max_discard_sectors(zram->disk->queue, UINT_MAX);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, zram->disk->queue);
/*
* zram_bio_discard() will clear all logical blocks if logical block

4
drivers/md/bcache/request.c
View file

@ -1005,7 +1005,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
bio_get(s->iop.bio);
if (bio_op(bio) == REQ_OP_DISCARD &&
!blk_queue_discard(bdev_get_queue(dc->bdev)))
!bdev_max_discard_sectors(dc->bdev))
goto insert_data;
/* I/O request sent to backing device */
@ -1115,7 +1115,7 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio,
bio->bi_private = ddip;
if ((bio_op(bio) == REQ_OP_DISCARD) &&
!blk_queue_discard(bdev_get_queue(dc->bdev)))
!bdev_max_discard_sectors(dc->bdev))
bio->bi_end_io(bio);
else
submit_bio_noacct(bio);

3
drivers/md/bcache/super.c
View file

@ -973,7 +973,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
blk_queue_flag_set(QUEUE_FLAG_NONROT, d->disk->queue);
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, d->disk->queue);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, d->disk->queue);
blk_queue_write_cache(q, true, true);
@ -2350,7 +2349,7 @@ static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
ca->bdev->bd_holder = ca;
ca->sb_disk = sb_disk;
if (blk_queue_discard(bdev_get_queue(bdev)))
if (bdev_max_discard_sectors((bdev)))
ca->discard = CACHE_DISCARD(&ca->sb);
ret = cache_alloc(ca);

2
drivers/md/bcache/sysfs.c
View file

@ -1151,7 +1151,7 @@ STORE(__bch_cache)
if (attr == &sysfs_discard) {
bool v = strtoul_or_return(buf);
if (blk_queue_discard(bdev_get_queue(ca->bdev)))
if (bdev_max_discard_sectors(ca->bdev))
ca->discard = v;
if (v != CACHE_DISCARD(&ca->sb)) {

9
drivers/md/dm-cache-target.c
View file

@ -3329,13 +3329,6 @@ static int cache_iterate_devices(struct dm_target *ti,
return r;
}
static bool origin_dev_supports_discard(struct block_device *origin_bdev)
{
struct request_queue *q = bdev_get_queue(origin_bdev);
return blk_queue_discard(q);
}
/*
* If discard_passdown was enabled verify that the origin device
* supports discards. Disable discard_passdown if not.
@ -3349,7 +3342,7 @@ static void disable_passdown_if_not_supported(struct cache *cache)
if (!cache->features.discard_passdown)
return;
if (!origin_dev_supports_discard(origin_bdev))
if (!bdev_max_discard_sectors(origin_bdev))
reason = "discard unsupported";
else if (origin_limits->max_discard_sectors < cache->sectors_per_block)

9
drivers/md/dm-clone-target.c
View file

@ -2016,13 +2016,6 @@ static void clone_resume(struct dm_target *ti)
do_waker(&clone->waker.work);
}
static bool bdev_supports_discards(struct block_device *bdev)
{
struct request_queue *q = bdev_get_queue(bdev);
return (q && blk_queue_discard(q));
}
/*
* If discard_passdown was enabled verify that the destination device supports
* discards. Disable discard_passdown if not.
@ -2036,7 +2029,7 @@ static void disable_passdown_if_not_supported(struct clone *clone)
if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags))
return;
if (!bdev_supports_discards(dest_dev))
if (!bdev_max_discard_sectors(dest_dev))
reason = "discard unsupported";
else if (dest_limits->max_discard_sectors < clone->region_size)
reason = "max discard sectors smaller than a region";

3
drivers/md/dm-log-writes.c
View file

@ -866,9 +866,8 @@ static int log_writes_message(struct dm_target *ti, unsigned argc, char **argv,
static void log_writes_io_hints(struct dm_target *ti, struct queue_limits *limits)
{
struct log_writes_c *lc = ti->private;
struct request_queue *q = bdev_get_queue(lc->dev->bdev);
if (!q || !blk_queue_discard(q)) {
if (!bdev_max_discard_sectors(lc->dev->bdev)) {
lc->device_supports_discard = false;
limits->discard_granularity = lc->sectorsize;
limits->max_discard_sectors = (UINT_MAX >> SECTOR_SHIFT);

9
drivers/md/dm-raid.c
View file

@ -2963,13 +2963,8 @@ static void configure_discard_support(struct raid_set *rs)
raid456 = rs_is_raid456(rs);
for (i = 0; i < rs->raid_disks; i++) {
struct request_queue *q;
if (!rs->dev[i].rdev.bdev)
continue;
q = bdev_get_queue(rs->dev[i].rdev.bdev);
if (!q || !blk_queue_discard(q))
if (!rs->dev[i].rdev.bdev ||
!bdev_max_discard_sectors(rs->dev[i].rdev.bdev))
return;
if (raid456) {

9
drivers/md/dm-table.c
View file

@ -1888,9 +1888,7 @@ static bool dm_table_supports_nowait(struct dm_table *t)
static int device_not_discard_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
return !blk_queue_discard(q);
return !bdev_max_discard_sectors(dev->bdev);
}
static bool dm_table_supports_discards(struct dm_table *t)
@ -1970,15 +1968,12 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, q);
if (!dm_table_supports_discards(t)) {
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
/* Must also clear discard limits... */
q->limits.max_discard_sectors = 0;
q->limits.max_hw_discard_sectors = 0;
q->limits.discard_granularity = 0;
q->limits.discard_alignment = 0;
q->limits.discard_misaligned = 0;
} else
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
}
if (dm_table_supports_secure_erase(t))
blk_queue_flag_set(QUEUE_FLAG_SECERASE, q);

11
drivers/md/dm-thin.c
View file

@ -2802,13 +2802,6 @@ static void requeue_bios(struct pool *pool)
/*----------------------------------------------------------------
* Binding of control targets to a pool object
*--------------------------------------------------------------*/
static bool data_dev_supports_discard(struct pool_c *pt)
{
struct request_queue *q = bdev_get_queue(pt->data_dev->bdev);
return blk_queue_discard(q);
}
static bool is_factor(sector_t block_size, uint32_t n)
{
return !sector_div(block_size, n);
@ -2828,7 +2821,7 @@ static void disable_passdown_if_not_supported(struct pool_c *pt)
if (!pt->adjusted_pf.discard_passdown)
return;
if (!data_dev_supports_discard(pt))
if (!bdev_max_discard_sectors(pt->data_dev->bdev))
reason = "discard unsupported";
else if (data_limits->max_discard_sectors < pool->sectors_per_block)
@ -4057,8 +4050,6 @@ static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits)
/*
* Must explicitly disallow stacking discard limits otherwise the
* block layer will stack them if pool's data device has support.
* QUEUE_FLAG_DISCARD wouldn't be set but there is no way for the
* user to see that, so make sure to set all discard limits to 0.
*/
limits->discard_granularity = 0;
return;

3
drivers/md/dm.c
View file

@ -955,7 +955,6 @@ void disable_discard(struct mapped_device *md)
/* device doesn't really support DISCARD, disable it */
limits->max_discard_sectors = 0;
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue);
}
void disable_write_zeroes(struct mapped_device *md)
@ -982,7 +981,7 @@ static void clone_endio(struct bio *bio)
if (unlikely(error == BLK_STS_TARGET)) {
if (bio_op(bio) == REQ_OP_DISCARD &&
!q->limits.max_discard_sectors)
!bdev_max_discard_sectors(bio->bi_bdev))
disable_discard(md);
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
!q->limits.max_write_zeroes_sectors)

11
drivers/md/md-linear.c
View file

@ -64,7 +64,6 @@ static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks)
struct linear_conf *conf;
struct md_rdev *rdev;
int i, cnt;
bool discard_supported = false;
conf = kzalloc(struct_size(conf, disks, raid_disks), GFP_KERNEL);
if (!conf)
@ -96,9 +95,6 @@ static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks)
conf->array_sectors += rdev->sectors;
cnt++;
if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
discard_supported = true;
}
if (cnt != raid_disks) {
pr_warn("md/linear:%s: not enough drives present. Aborting!\n",
@ -106,11 +102,6 @@ static struct linear_conf *linear_conf(struct mddev *mddev, int raid_disks)
goto out;
}
if (!discard_supported)
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue);
else
blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue);
/*
* Here we calculate the device offsets.
*/
@ -252,7 +243,7 @@ static bool linear_make_request(struct mddev *mddev, struct bio *bio)
start_sector + data_offset;
if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
!blk_queue_discard(bio->bi_bdev->bd_disk->queue))) {
!bdev_max_discard_sectors(bio->bi_bdev))) {
/* Just ignore it */
bio_endio(bio);
} else {

7
drivers/md/raid0.c
View file

@ -399,7 +399,6 @@ static int raid0_run(struct mddev *mddev)
conf = mddev->private;
if (mddev->queue) {
struct md_rdev *rdev;
bool discard_supported = false;
blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors);
@ -412,13 +411,7 @@ static int raid0_run(struct mddev *mddev)
rdev_for_each(rdev, mddev) {
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
discard_supported = true;
}
if (!discard_supported)
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue);
else
blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue);
}
/* calculate array device size */

16
drivers/md/raid1.c
View file

@ -806,7 +806,7 @@ static void flush_bio_list(struct r1conf *conf, struct bio *bio)
if (test_bit(Faulty, &rdev->flags)) {
bio_io_error(bio);
} else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
!blk_queue_discard(bio->bi_bdev->bd_disk->queue)))
!bdev_max_discard_sectors(bio->bi_bdev)))
/* Just ignore it */
bio_endio(bio);
else
@ -1830,8 +1830,6 @@ static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev)
break;
}
}
if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev)))
blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue);
print_conf(conf);
return err;
}
@ -3110,7 +3108,6 @@ static int raid1_run(struct mddev *mddev)
int i;
struct md_rdev *rdev;
int ret;
bool discard_supported = false;
if (mddev->level != 1) {
pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n",
@ -3145,8 +3142,6 @@ static int raid1_run(struct mddev *mddev)
continue;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
discard_supported = true;
}
mddev->degraded = 0;
@ -3183,15 +3178,6 @@ static int raid1_run(struct mddev *mddev)
md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
if (mddev->queue) {
if (discard_supported)
blk_queue_flag_set(QUEUE_FLAG_DISCARD,
mddev->queue);
else
blk_queue_flag_clear(QUEUE_FLAG_DISCARD,
mddev->queue);
}
ret = md_integrity_register(mddev);
if (ret) {
md_unregister_thread(&mddev->thread);

18
drivers/md/raid10.c
View file

@ -895,7 +895,7 @@ static void flush_pending_writes(struct r10conf *conf)
if (test_bit(Faulty, &rdev->flags)) {
bio_io_error(bio);
} else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
!blk_queue_discard(bio->bi_bdev->bd_disk->queue)))
!bdev_max_discard_sectors(bio->bi_bdev)))
/* Just ignore it */
bio_endio(bio);
else
@ -1090,7 +1090,7 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
if (test_bit(Faulty, &rdev->flags)) {
bio_io_error(bio);
} else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
!blk_queue_discard(bio->bi_bdev->bd_disk->queue)))
!bdev_max_discard_sectors(bio->bi_bdev)))
/* Just ignore it */
bio_endio(bio);
else
@ -2151,8 +2151,6 @@ static int raid10_add_disk(struct mddev *mddev, struct md_rdev *rdev)
rcu_assign_pointer(p->rdev, rdev);
break;
}
if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev)))
blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue);
print_conf(conf);
return err;
@ -4076,7 +4074,6 @@ static int raid10_run(struct mddev *mddev)
sector_t size;
sector_t min_offset_diff = 0;
int first = 1;
bool discard_supported = false;
if (mddev_init_writes_pending(mddev) < 0)
return -ENOMEM;
@ -4147,20 +4144,9 @@ static int raid10_run(struct mddev *mddev)
rdev->data_offset << 9);
disk->head_position = 0;
if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
discard_supported = true;
first = 0;
}
if (mddev->queue) {
if (discard_supported)
blk_queue_flag_set(QUEUE_FLAG_DISCARD,
mddev->queue);
else
blk_queue_flag_clear(QUEUE_FLAG_DISCARD,
mddev->queue);
}
/* need to check that every block has at least one working mirror */
if (!enough(conf, -1)) {
pr_err("md/raid10:%s: not enough operational mirrors.\n",

2
drivers/md/raid5-cache.c
View file

@ -1318,7 +1318,7 @@ static void r5l_write_super_and_discard_space(struct r5l_log *log,
r5l_write_super(log, end);
if (!blk_queue_discard(bdev_get_queue(bdev)))
if (!bdev_max_discard_sectors(bdev))
return;
mddev = log->rdev->mddev;

12
drivers/md/raid5.c
View file

@ -7776,14 +7776,10 @@ static int raid5_run(struct mddev *mddev)
* A better idea might be to turn DISCARD into WRITE_ZEROES
* requests, as that is required to be safe.
*/
if (devices_handle_discard_safely &&
mddev->queue->limits.max_discard_sectors >= (stripe >> 9) &&
mddev->queue->limits.discard_granularity >= stripe)
blk_queue_flag_set(QUEUE_FLAG_DISCARD,
mddev->queue);
else
blk_queue_flag_clear(QUEUE_FLAG_DISCARD,
mddev->queue);
if (!devices_handle_discard_safely ||
mddev->queue->limits.max_discard_sectors < (stripe >> 9) ||
mddev->queue->limits.discard_granularity < stripe)
blk_queue_max_discard_sectors(mddev->queue, 0);
blk_queue_max_hw_sectors(mddev->queue, UINT_MAX);
}

1
drivers/mmc/core/queue.c
View file

@ -183,7 +183,6 @@ static void mmc_queue_setup_discard(struct request_queue *q,
if (!max_discard)
return;
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
blk_queue_max_discard_sectors(q, max_discard);
q->limits.discard_granularity = card->pref_erase << 9;
/* granularity must not be greater than max. discard */

1
drivers/mtd/mtd_blkdevs.c
View file

@ -377,7 +377,6 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, new->rq);
if (tr->discard) {
blk_queue_flag_set(QUEUE_FLAG_DISCARD, new->rq);
blk_queue_max_discard_sectors(new->rq, UINT_MAX);
new->rq->limits.discard_granularity = tr->blksize;
}

4
drivers/nvme/host/core.c
View file

@ -1621,7 +1621,7 @@ static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
u32 size = queue_logical_block_size(queue);
if (ctrl->max_discard_sectors == 0) {
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
blk_queue_max_discard_sectors(queue, 0);
return;
}
@ -1632,7 +1632,7 @@ static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
queue->limits.discard_granularity = size;
/* If discard is already enabled, don't reset queue limits */
if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
if (queue->limits.max_discard_sectors)
return;
blk_queue_max_discard_sectors(queue, ctrl->max_discard_sectors);

1
drivers/s390/block/dasd_fba.c
View file

@ -791,7 +791,6 @@ static void dasd_fba_setup_blk_queue(struct dasd_block *block)
blk_queue_max_discard_sectors(q, max_discard_sectors);
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
}
static int dasd_fba_pe_handler(struct dasd_device *device,

2
drivers/scsi/sd.c
View file

@ -797,7 +797,6 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
case SD_LBP_FULL:
case SD_LBP_DISABLE:
blk_queue_max_discard_sectors(q, 0);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
return;
case SD_LBP_UNMAP:
@ -830,7 +829,6 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
}
blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
}
static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)

2
drivers/target/target_core_device.c
View file

@ -838,7 +838,7 @@ bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
struct request_queue *q = bdev_get_queue(bdev);
int block_size = bdev_logical_block_size(bdev);
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(bdev))
return false;
attrib->max_unmap_lba_count =

4
fs/btrfs/extent-tree.c
View file

@ -1291,7 +1291,7 @@ static int do_discard_extent(struct btrfs_io_stripe *stripe, u64 *bytes)
ret = btrfs_reset_device_zone(dev_replace->tgtdev, phys, len,
&discarded);
discarded += src_disc;
} else if (blk_queue_discard(bdev_get_queue(stripe->dev->bdev))) {
} else if (bdev_max_discard_sectors(stripe->dev->bdev)) {
ret = btrfs_issue_discard(dev->bdev, phys, len, &discarded);
} else {
ret = 0;
@ -5987,7 +5987,7 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, u64 *trimmed)
*trimmed = 0;
/* Discard not supported = nothing to do. */
if (!blk_queue_discard(bdev_get_queue(device->bdev)))
if (!bdev_max_discard_sectors(device->bdev))
return 0;
/* Not writable = nothing to do. */

2
fs/btrfs/ioctl.c
View file

@ -501,7 +501,7 @@ static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
if (!device->bdev)
continue;
q = bdev_get_queue(device->bdev);
if (blk_queue_discard(q)) {
if (bdev_max_discard_sectors(device->bdev)) {
num_devices++;
minlen = min_t(u64, q->limits.discard_granularity,
minlen);

2
fs/exfat/file.c
View file

@ -358,7 +358,7 @@ static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
return -EOPNOTSUPP;
if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))

10
fs/exfat/super.c
View file

@ -627,13 +627,9 @@ static int exfat_fill_super(struct super_block *sb, struct fs_context *fc)
if (opts->allow_utime == (unsigned short)-1)
opts->allow_utime = ~opts->fs_dmask & 0022;
if (opts->discard) {
struct request_queue *q = bdev_get_queue(sb->s_bdev);
if (!blk_queue_discard(q)) {
exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard");
opts->discard = 0;
}
if (opts->discard && !bdev_max_discard_sectors(sb->s_bdev)) {
exfat_warn(sb, "mounting with \"discard\" option, but the device does not support discard");
opts->discard = 0;
}
sb->s_flags |= SB_NODIRATIME;

10
fs/ext4/ioctl.c
View file

@ -1044,7 +1044,6 @@ static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
__u32 flags = 0;
unsigned int flush_flags = 0;
struct super_block *sb = file_inode(filp)->i_sb;
struct request_queue *q;
if (copy_from_user(&flags, (__u32 __user *)arg,
sizeof(__u32)))
@ -1065,10 +1064,8 @@ static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
if (flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID)
return -EINVAL;
q = bdev_get_queue(EXT4_SB(sb)->s_journal->j_dev);
if (!q)
return -ENXIO;
if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && !blk_queue_discard(q))
if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
!bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
return -EOPNOTSUPP;
if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
@ -1393,14 +1390,13 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case FITRIM:
{
struct request_queue *q = bdev_get_queue(sb->s_bdev);
struct fstrim_range range;
int ret = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(sb->s_bdev))
return -EOPNOTSUPP;
/*

10
fs/ext4/super.c
View file

@ -5458,13 +5458,9 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
goto failed_mount9;
}
if (test_opt(sb, DISCARD)) {
struct request_queue *q = bdev_get_queue(sb->s_bdev);
if (!blk_queue_discard(q))
ext4_msg(sb, KERN_WARNING,
"mounting with \"discard\" option, but "
"the device does not support discard");
}
if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev))
ext4_msg(sb, KERN_WARNING,
"mounting with \"discard\" option, but the device does not support discard");
if (es->s_error_count)
mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */

3
fs/f2fs/f2fs.h
View file

@ -4381,8 +4381,7 @@ static inline bool f2fs_hw_should_discard(struct f2fs_sb_info *sbi)
static inline bool f2fs_bdev_support_discard(struct block_device *bdev)
{
return blk_queue_discard(bdev_get_queue(bdev)) ||
bdev_is_zoned(bdev);
return bdev_max_discard_sectors(bdev) || bdev_is_zoned(bdev);
}
static inline bool f2fs_hw_support_discard(struct f2fs_sb_info *sbi)

2
fs/fat/file.c
View file

@ -133,7 +133,7 @@ static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(sb->s_bdev))
return -EOPNOTSUPP;
user_range = (struct fstrim_range __user *)arg;

10
fs/fat/inode.c
View file

@ -1872,13 +1872,9 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
goto out_fail;
}
if (sbi->options.discard) {
struct request_queue *q = bdev_get_queue(sb->s_bdev);
if (!blk_queue_discard(q))
fat_msg(sb, KERN_WARNING,
"mounting with \"discard\" option, but "
"the device does not support discard");
}
if (sbi->options.discard && !bdev_max_discard_sectors(sb->s_bdev))
fat_msg(sb, KERN_WARNING,
"mounting with \"discard\" option, but the device does not support discard");
fat_set_state(sb, 1, 0);
return 0;

2
fs/gfs2/rgrp.c
View file

@ -1405,7 +1405,7 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
return -EROFS;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(sdp->sd_vfs->s_bdev))
return -EOPNOTSUPP;
if (copy_from_user(&r, argp, sizeof(r)))

7
fs/jbd2/journal.c
View file

@ -1762,7 +1762,6 @@ static int __jbd2_journal_erase(journal_t *journal, unsigned int flags)
unsigned long block, log_offset; /* logical */
unsigned long long phys_block, block_start, block_stop; /* physical */
loff_t byte_start, byte_stop, byte_count;
struct request_queue *q = bdev_get_queue(journal->j_dev);
/* flags must be set to either discard or zeroout */
if ((flags & ~JBD2_JOURNAL_FLUSH_VALID) || !flags ||
@ -1770,10 +1769,8 @@ static int __jbd2_journal_erase(journal_t *journal, unsigned int flags)
(flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
return -EINVAL;
if (!q)
return -ENXIO;
if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && !blk_queue_discard(q))
if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
!bdev_max_discard_sectors(journal->j_dev))
return -EOPNOTSUPP;
/*

2
fs/jfs/ioctl.c
View file

@ -117,7 +117,7 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q)) {
if (!bdev_max_discard_sectors(sb->s_bdev)) {
jfs_warn("FITRIM not supported on device");
return -EOPNOTSUPP;
}

8
fs/jfs/super.c
View file

@ -372,19 +372,16 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
}
case Opt_discard:
{
struct request_queue *q = bdev_get_queue(sb->s_bdev);
/* if set to 1, even copying files will cause
* trimming :O
* -> user has more control over the online trimming
*/
sbi->minblks_trim = 64;
if (blk_queue_discard(q))
if (bdev_max_discard_sectors(sb->s_bdev))
*flag |= JFS_DISCARD;
else
pr_err("JFS: discard option not supported on device\n");
break;
}
case Opt_nodiscard:
*flag &= ~JFS_DISCARD;
@ -392,10 +389,9 @@ static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
case Opt_discard_minblk:
{
struct request_queue *q = bdev_get_queue(sb->s_bdev);
char *minblks_trim = args[0].from;
int rc;
if (blk_queue_discard(q)) {
if (bdev_max_discard_sectors(sb->s_bdev)) {
*flag |= JFS_DISCARD;
rc = kstrtouint(minblks_trim, 0,
&sbi->minblks_trim);

2
fs/nilfs2/ioctl.c
View file

@ -1059,7 +1059,7 @@ static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(nilfs->ns_bdev))
return -EOPNOTSUPP;
if (copy_from_user(&range, argp, sizeof(range)))

2
fs/ntfs3/file.c
View file

@ -28,7 +28,7 @@ static int ntfs_ioctl_fitrim(struct ntfs_sb_info *sbi, unsigned long arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(sbi->sb->s_bdev))
return -EOPNOTSUPP;
user_range = (struct fstrim_range __user *)arg;

2
fs/ntfs3/super.c
View file

@ -913,7 +913,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
}
rq = bdev_get_queue(bdev);
if (blk_queue_discard(rq) && rq->limits.discard_granularity) {
if (bdev_max_discard_sectors(bdev) && rq->limits.discard_granularity) {
sbi->discard_granularity = rq->limits.discard_granularity;
sbi->discard_granularity_mask_inv =
~(u64)(sbi->discard_granularity - 1);

2
fs/ocfs2/ioctl.c
View file

@ -910,7 +910,7 @@ long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(sb->s_bdev))
return -EOPNOTSUPP;
if (copy_from_user(&range, argp, sizeof(range)))

2
fs/xfs/xfs_discard.c
View file

@ -162,7 +162,7 @@ xfs_ioc_trim(
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
if (!bdev_max_discard_sectors(mp->m_ddev_targp->bt_bdev))
return -EOPNOTSUPP;
/*

12
fs/xfs/xfs_super.c
View file

@ -1608,14 +1608,10 @@ xfs_fs_fill_super(
goto out_filestream_unmount;
}
if (xfs_has_discard(mp)) {
struct request_queue *q = bdev_get_queue(sb->s_bdev);
if (!blk_queue_discard(q)) {
xfs_warn(mp, "mounting with \"discard\" option, but "
"the device does not support discard");
mp->m_features &= ~XFS_FEAT_DISCARD;
}
if (xfs_has_discard(mp) && !bdev_max_discard_sectors(sb->s_bdev)) {
xfs_warn(mp,
"mounting with \"discard\" option, but the device does not support discard");
mp->m_features &= ~XFS_FEAT_DISCARD;
}
if (xfs_has_reflink(mp)) {

2
include/linux/blkdev.h
View file

@ -540,7 +540,6 @@ struct request_queue {
#define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
#define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
#define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */
#define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
#define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
#define QUEUE_FLAG_SECERASE 11 /* supports secure erase */
@ -582,7 +581,6 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
#define blk_queue_zone_resetall(q) \
test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
#define blk_queue_secure_erase(q) \

17
mm/swapfile.c
View file

@ -2957,20 +2957,6 @@ static int setup_swap_map_and_extents(struct swap_info_struct *p,
return nr_extents;
}
/*
* Helper to sys_swapon determining if a given swap
* backing device queue supports DISCARD operations.
*/
static bool swap_discardable(struct swap_info_struct *si)
{
struct request_queue *q = bdev_get_queue(si->bdev);
if (!blk_queue_discard(q))
return false;
return true;
}
SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
{
struct swap_info_struct *p;
@ -3132,7 +3118,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
sizeof(long),
GFP_KERNEL);
if (p->bdev && (swap_flags & SWAP_FLAG_DISCARD) && swap_discardable(p)) {
if ((swap_flags & SWAP_FLAG_DISCARD) &&
p->bdev && bdev_max_discard_sectors(p->bdev)) {
/*
* When discard is enabled for swap with no particular
* policy flagged, we set all swap discard flags here in