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Christoph Hellwigaxboe
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block: remove QUEUE_FLAG_DISCARD
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 <[email protected]> Reviewed-by: Martin K. Petersen <[email protected]> Acked-by: Christoph Böhmwalder <[email protected]> [drbd] Acked-by: Jan Höppner <[email protected]> [s390] Acked-by: Coly Li <[email protected]> [bcache] Acked-by: David Sterba <[email protected]> [btrfs] Reviewed-by: Chaitanya Kulkarni <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
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61 files changed

+73
-244
lines changed

arch/um/drivers/ubd_kern.c

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -483,7 +483,6 @@ static void ubd_handler(void)
483483
if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {
484484
blk_queue_max_discard_sectors(io_req->req->q, 0);
485485
blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);
486-
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);
487486
}
488487
blk_mq_end_request(io_req->req, io_req->error);
489488
kfree(io_req);
@@ -803,7 +802,6 @@ static int ubd_open_dev(struct ubd *ubd_dev)
803802
ubd_dev->queue->limits.discard_alignment = SECTOR_SIZE;
804803
blk_queue_max_discard_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
805804
blk_queue_max_write_zeroes_sectors(ubd_dev->queue, UBD_MAX_REQUEST);
806-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, ubd_dev->queue);
807805
}
808806
blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);
809807
return 0;

block/blk-core.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -820,7 +820,7 @@ void submit_bio_noacct(struct bio *bio)
820820

821821
switch (bio_op(bio)) {
822822
case REQ_OP_DISCARD:
823-
if (!blk_queue_discard(q))
823+
if (!bdev_max_discard_sectors(bdev))
824824
goto not_supported;
825825
break;
826826
case REQ_OP_SECURE_ERASE:

block/blk-lib.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -53,7 +53,7 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
5353
return -EOPNOTSUPP;
5454
op = REQ_OP_SECURE_ERASE;
5555
} else {
56-
if (!blk_queue_discard(q))
56+
if (!bdev_max_discard_sectors(bdev))
5757
return -EOPNOTSUPP;
5858
op = REQ_OP_DISCARD;
5959
}

block/blk-mq-debugfs.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -113,7 +113,6 @@ static const char *const blk_queue_flag_name[] = {
113113
QUEUE_FLAG_NAME(FAIL_IO),
114114
QUEUE_FLAG_NAME(NONROT),
115115
QUEUE_FLAG_NAME(IO_STAT),
116-
QUEUE_FLAG_NAME(DISCARD),
117116
QUEUE_FLAG_NAME(NOXMERGES),
118117
QUEUE_FLAG_NAME(ADD_RANDOM),
119118
QUEUE_FLAG_NAME(SECERASE),

block/ioctl.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -87,14 +87,13 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
8787
{
8888
uint64_t range[2];
8989
uint64_t start, len;
90-
struct request_queue *q = bdev_get_queue(bdev);
9190
struct inode *inode = bdev->bd_inode;
9291
int err;
9392

9493
if (!(mode & FMODE_WRITE))
9594
return -EBADF;
9695

97-
if (!blk_queue_discard(q))
96+
if (!bdev_max_discard_sectors(bdev))
9897
return -EOPNOTSUPP;
9998

10099
if (copy_from_user(range, (void __user *)arg, sizeof(range)))

drivers/block/drbd/drbd_main.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -942,7 +942,7 @@ int drbd_send_sizes(struct drbd_peer_device *peer_device, int trigger_reply, enu
942942
cpu_to_be32(bdev_alignment_offset(bdev));
943943
p->qlim->io_min = cpu_to_be32(bdev_io_min(bdev));
944944
p->qlim->io_opt = cpu_to_be32(bdev_io_opt(bdev));
945-
p->qlim->discard_enabled = blk_queue_discard(q);
945+
p->qlim->discard_enabled = !!bdev_max_discard_sectors(bdev);
946946
put_ldev(device);
947947
} else {
948948
struct request_queue *q = device->rq_queue;

drivers/block/drbd/drbd_nl.c

Lines changed: 2 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -1210,7 +1210,7 @@ static void decide_on_discard_support(struct drbd_device *device,
12101210
first_peer_device(device)->connection;
12111211
struct request_queue *q = device->rq_queue;
12121212

1213-
if (bdev && !blk_queue_discard(bdev->backing_bdev->bd_disk->queue))
1213+
if (bdev && !bdev_max_discard_sectors(bdev->backing_bdev))
12141214
goto not_supported;
12151215

12161216
if (connection->cstate >= C_CONNECTED &&
@@ -1230,30 +1230,16 @@ static void decide_on_discard_support(struct drbd_device *device,
12301230
*/
12311231
blk_queue_discard_granularity(q, 512);
12321232
q->limits.max_discard_sectors = drbd_max_discard_sectors(connection);
1233-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
12341233
q->limits.max_write_zeroes_sectors =
12351234
drbd_max_discard_sectors(connection);
12361235
return;
12371236

12381237
not_supported:
1239-
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
12401238
blk_queue_discard_granularity(q, 0);
12411239
q->limits.max_discard_sectors = 0;
12421240
q->limits.max_write_zeroes_sectors = 0;
12431241
}
12441242

1245-
static void fixup_discard_if_not_supported(struct request_queue *q)
1246-
{
1247-
/* To avoid confusion, if this queue does not support discard, clear
1248-
* max_discard_sectors, which is what lsblk -D reports to the user.
1249-
* Older kernels got this wrong in "stack limits".
1250-
* */
1251-
if (!blk_queue_discard(q)) {
1252-
blk_queue_max_discard_sectors(q, 0);
1253-
blk_queue_discard_granularity(q, 0);
1254-
}
1255-
}
1256-
12571243
static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q)
12581244
{
12591245
/* 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
13001286
blk_stack_limits(&q->limits, &b->limits, 0);
13011287
disk_update_readahead(device->vdisk);
13021288
}
1303-
fixup_discard_if_not_supported(q);
13041289
fixup_write_zeroes(device, q);
13051290
}
13061291

@@ -1447,7 +1432,7 @@ static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *dis
14471432
if (disk_conf->al_extents > drbd_al_extents_max(nbc))
14481433
disk_conf->al_extents = drbd_al_extents_max(nbc);
14491434

1450-
if (!blk_queue_discard(q)) {
1435+
if (!bdev_max_discard_sectors(bdev)) {
14511436
if (disk_conf->rs_discard_granularity) {
14521437
disk_conf->rs_discard_granularity = 0; /* disable feature */
14531438
drbd_info(device, "rs_discard_granularity feature disabled\n");

drivers/block/drbd/drbd_receiver.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1575,11 +1575,10 @@ int drbd_issue_discard_or_zero_out(struct drbd_device *device, sector_t start, u
15751575

15761576
static bool can_do_reliable_discards(struct drbd_device *device)
15771577
{
1578-
struct request_queue *q = bdev_get_queue(device->ldev->backing_bdev);
15791578
struct disk_conf *dc;
15801579
bool can_do;
15811580

1582-
if (!blk_queue_discard(q))
1581+
if (!bdev_max_discard_sectors(device->ldev->backing_bdev))
15831582
return false;
15841583

15851584
rcu_read_lock();

drivers/block/loop.c

Lines changed: 3 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -314,15 +314,12 @@ static int lo_fallocate(struct loop_device *lo, struct request *rq, loff_t pos,
314314

315315
mode |= FALLOC_FL_KEEP_SIZE;
316316

317-
if (!blk_queue_discard(lo->lo_queue)) {
318-
ret = -EOPNOTSUPP;
319-
goto out;
320-
}
317+
if (!bdev_max_discard_sectors(lo->lo_device))
318+
return -EOPNOTSUPP;
321319

322320
ret = file->f_op->fallocate(file, mode, pos, blk_rq_bytes(rq));
323321
if (unlikely(ret && ret != -EINVAL && ret != -EOPNOTSUPP))
324-
ret = -EIO;
325-
out:
322+
return -EIO;
326323
return ret;
327324
}
328325

@@ -787,12 +784,10 @@ static void loop_config_discard(struct loop_device *lo)
787784
q->limits.discard_granularity = granularity;
788785
blk_queue_max_discard_sectors(q, max_discard_sectors);
789786
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
790-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
791787
} else {
792788
q->limits.discard_granularity = 0;
793789
blk_queue_max_discard_sectors(q, 0);
794790
blk_queue_max_write_zeroes_sectors(q, 0);
795-
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
796791
}
797792
q->limits.discard_alignment = 0;
798793
}

drivers/block/nbd.c

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1231,8 +1231,6 @@ static void nbd_parse_flags(struct nbd_device *nbd)
12311231
set_disk_ro(nbd->disk, true);
12321232
else
12331233
set_disk_ro(nbd->disk, false);
1234-
if (config->flags & NBD_FLAG_SEND_TRIM)
1235-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, nbd->disk->queue);
12361234
if (config->flags & NBD_FLAG_SEND_FLUSH) {
12371235
if (config->flags & NBD_FLAG_SEND_FUA)
12381236
blk_queue_write_cache(nbd->disk->queue, true, true);
@@ -1319,8 +1317,7 @@ static void nbd_config_put(struct nbd_device *nbd)
13191317
nbd->tag_set.timeout = 0;
13201318
nbd->disk->queue->limits.discard_granularity = 0;
13211319
nbd->disk->queue->limits.discard_alignment = 0;
1322-
blk_queue_max_discard_sectors(nbd->disk->queue, UINT_MAX);
1323-
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, nbd->disk->queue);
1320+
blk_queue_max_discard_sectors(nbd->disk->queue, 0);
13241321

13251322
mutex_unlock(&nbd->config_lock);
13261323
nbd_put(nbd);

drivers/block/null_blk/main.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1767,7 +1767,6 @@ static void null_config_discard(struct nullb *nullb)
17671767
nullb->q->limits.discard_granularity = nullb->dev->blocksize;
17681768
nullb->q->limits.discard_alignment = nullb->dev->blocksize;
17691769
blk_queue_max_discard_sectors(nullb->q, UINT_MAX >> 9);
1770-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, nullb->q);
17711770
}
17721771

17731772
static const struct block_device_operations null_bio_ops = {

drivers/block/rbd.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4942,7 +4942,6 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
49424942
blk_queue_io_opt(q, rbd_dev->opts->alloc_size);
49434943

49444944
if (rbd_dev->opts->trim) {
4945-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
49464945
q->limits.discard_granularity = rbd_dev->opts->alloc_size;
49474946
blk_queue_max_discard_sectors(q, objset_bytes >> SECTOR_SHIFT);
49484947
blk_queue_max_write_zeroes_sectors(q, objset_bytes >> SECTOR_SHIFT);

drivers/block/rnbd/rnbd-clt.c

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1364,8 +1364,6 @@ static void setup_request_queue(struct rnbd_clt_dev *dev)
13641364
blk_queue_max_discard_sectors(dev->queue, dev->max_discard_sectors);
13651365
dev->queue->limits.discard_granularity = dev->discard_granularity;
13661366
dev->queue->limits.discard_alignment = dev->discard_alignment;
1367-
if (dev->max_discard_sectors)
1368-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, dev->queue);
13691367
if (dev->secure_discard)
13701368
blk_queue_flag_set(QUEUE_FLAG_SECERASE, dev->queue);
13711369

drivers/block/rnbd/rnbd-srv-dev.h

Lines changed: 0 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -49,9 +49,6 @@ static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
4949

5050
static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
5151
{
52-
if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
53-
return 0;
54-
5552
return bdev_max_discard_sectors(dev->bdev);
5653
}
5754

drivers/block/virtio_blk.c

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -888,8 +888,6 @@ static int virtblk_probe(struct virtio_device *vdev)
888888
v = sg_elems;
889889
blk_queue_max_discard_segments(q,
890890
min(v, MAX_DISCARD_SEGMENTS));
891-
892-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
893891
}
894892

895893
if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) {

drivers/block/xen-blkback/xenbus.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -583,7 +583,7 @@ static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info
583583
if (!xenbus_read_unsigned(dev->nodename, "discard-enable", 1))
584584
return;
585585

586-
if (blk_queue_discard(q)) {
586+
if (bdev_max_discard_sectors(bdev)) {
587587
err = xenbus_printf(xbt, dev->nodename,
588588
"discard-granularity", "%u",
589589
q->limits.discard_granularity);

drivers/block/xen-blkfront.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -944,7 +944,6 @@ static void blkif_set_queue_limits(struct blkfront_info *info)
944944
blk_queue_flag_set(QUEUE_FLAG_VIRT, rq);
945945

946946
if (info->feature_discard) {
947-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, rq);
948947
blk_queue_max_discard_sectors(rq, get_capacity(gd));
949948
rq->limits.discard_granularity = info->discard_granularity ?:
950949
info->physical_sector_size;
@@ -1606,7 +1605,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
16061605
blkif_req(req)->error = BLK_STS_NOTSUPP;
16071606
info->feature_discard = 0;
16081607
info->feature_secdiscard = 0;
1609-
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, rq);
1608+
blk_queue_max_discard_sectors(rq, 0);
16101609
blk_queue_flag_clear(QUEUE_FLAG_SECERASE, rq);
16111610
}
16121611
break;

drivers/block/zram/zram_drv.c

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1952,7 +1952,6 @@ static int zram_add(void)
19521952
blk_queue_io_opt(zram->disk->queue, PAGE_SIZE);
19531953
zram->disk->queue->limits.discard_granularity = PAGE_SIZE;
19541954
blk_queue_max_discard_sectors(zram->disk->queue, UINT_MAX);
1955-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, zram->disk->queue);
19561955

19571956
/*
19581957
* zram_bio_discard() will clear all logical blocks if logical block

drivers/md/bcache/request.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1005,7 +1005,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
10051005
bio_get(s->iop.bio);
10061006

10071007
if (bio_op(bio) == REQ_OP_DISCARD &&
1008-
!blk_queue_discard(bdev_get_queue(dc->bdev)))
1008+
!bdev_max_discard_sectors(dc->bdev))
10091009
goto insert_data;
10101010

10111011
/* I/O request sent to backing device */
@@ -1115,7 +1115,7 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio,
11151115
bio->bi_private = ddip;
11161116

11171117
if ((bio_op(bio) == REQ_OP_DISCARD) &&
1118-
!blk_queue_discard(bdev_get_queue(dc->bdev)))
1118+
!bdev_max_discard_sectors(dc->bdev))
11191119
bio->bi_end_io(bio);
11201120
else
11211121
submit_bio_noacct(bio);

drivers/md/bcache/super.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -973,7 +973,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
973973

974974
blk_queue_flag_set(QUEUE_FLAG_NONROT, d->disk->queue);
975975
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, d->disk->queue);
976-
blk_queue_flag_set(QUEUE_FLAG_DISCARD, d->disk->queue);
977976

978977
blk_queue_write_cache(q, true, true);
979978

@@ -2350,7 +2349,7 @@ static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
23502349
ca->bdev->bd_holder = ca;
23512350
ca->sb_disk = sb_disk;
23522351

2353-
if (blk_queue_discard(bdev_get_queue(bdev)))
2352+
if (bdev_max_discard_sectors((bdev)))
23542353
ca->discard = CACHE_DISCARD(&ca->sb);
23552354

23562355
ret = cache_alloc(ca);

drivers/md/bcache/sysfs.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1151,7 +1151,7 @@ STORE(__bch_cache)
11511151
if (attr == &sysfs_discard) {
11521152
bool v = strtoul_or_return(buf);
11531153

1154-
if (blk_queue_discard(bdev_get_queue(ca->bdev)))
1154+
if (bdev_max_discard_sectors(ca->bdev))
11551155
ca->discard = v;
11561156

11571157
if (v != CACHE_DISCARD(&ca->sb)) {

drivers/md/dm-cache-target.c

Lines changed: 1 addition & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -3329,13 +3329,6 @@ static int cache_iterate_devices(struct dm_target *ti,
33293329
return r;
33303330
}
33313331

3332-
static bool origin_dev_supports_discard(struct block_device *origin_bdev)
3333-
{
3334-
struct request_queue *q = bdev_get_queue(origin_bdev);
3335-
3336-
return blk_queue_discard(q);
3337-
}
3338-
33393332
/*
33403333
* If discard_passdown was enabled verify that the origin device
33413334
* supports discards. Disable discard_passdown if not.
@@ -3349,7 +3342,7 @@ static void disable_passdown_if_not_supported(struct cache *cache)
33493342
if (!cache->features.discard_passdown)
33503343
return;
33513344

3352-
if (!origin_dev_supports_discard(origin_bdev))
3345+
if (!bdev_max_discard_sectors(origin_bdev))
33533346
reason = "discard unsupported";
33543347

33553348
else if (origin_limits->max_discard_sectors < cache->sectors_per_block)

drivers/md/dm-clone-target.c

Lines changed: 1 addition & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -2016,13 +2016,6 @@ static void clone_resume(struct dm_target *ti)
20162016
do_waker(&clone->waker.work);
20172017
}
20182018

2019-
static bool bdev_supports_discards(struct block_device *bdev)
2020-
{
2021-
struct request_queue *q = bdev_get_queue(bdev);
2022-
2023-
return (q && blk_queue_discard(q));
2024-
}
2025-
20262019
/*
20272020
* If discard_passdown was enabled verify that the destination device supports
20282021
* discards. Disable discard_passdown if not.
@@ -2036,7 +2029,7 @@ static void disable_passdown_if_not_supported(struct clone *clone)
20362029
if (!test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags))
20372030
return;
20382031

2039-
if (!bdev_supports_discards(dest_dev))
2032+
if (!bdev_max_discard_sectors(dest_dev))
20402033
reason = "discard unsupported";
20412034
else if (dest_limits->max_discard_sectors < clone->region_size)
20422035
reason = "max discard sectors smaller than a region";

drivers/md/dm-log-writes.c

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -866,9 +866,8 @@ static int log_writes_message(struct dm_target *ti, unsigned argc, char **argv,
866866
static void log_writes_io_hints(struct dm_target *ti, struct queue_limits *limits)
867867
{
868868
struct log_writes_c *lc = ti->private;
869-
struct request_queue *q = bdev_get_queue(lc->dev->bdev);
870869

871-
if (!q || !blk_queue_discard(q)) {
870+
if (!bdev_max_discard_sectors(lc->dev->bdev)) {
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lc->device_supports_discard = false;
873872
limits->discard_granularity = lc->sectorsize;
874873
limits->max_discard_sectors = (UINT_MAX >> SECTOR_SHIFT);

drivers/md/dm-raid.c

Lines changed: 2 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -2963,13 +2963,8 @@ static void configure_discard_support(struct raid_set *rs)
29632963
raid456 = rs_is_raid456(rs);
29642964

29652965
for (i = 0; i < rs->raid_disks; i++) {
2966-
struct request_queue *q;
2967-
2968-
if (!rs->dev[i].rdev.bdev)
2969-
continue;
2970-
2971-
q = bdev_get_queue(rs->dev[i].rdev.bdev);
2972-
if (!q || !blk_queue_discard(q))
2966+
if (!rs->dev[i].rdev.bdev ||
2967+
!bdev_max_discard_sectors(rs->dev[i].rdev.bdev))
29732968
return;
29742969

29752970
if (raid456) {

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