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block: move the stable_writes flag to queue_limits

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Move the stable_writes flag into the queue_limits feature field so that
it can be set atomically with the queue frozen.

The flag is now inherited by blk_stack_limits, which greatly simplifies
the code in dm, and fixed md which previously did not pass on the flag
set on lower devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240617060532.127975-18-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-06-17 08:04:44 +02:00 committed by Jens Axboe
parent cdb2497918
commit 1a02f3a73f
12 changed files with 29 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -88,7 +88,6 @@ static const char *const blk_queue_flag_name[] = {
QUEUE_FLAG_NAME(SYNCHRONOUS),
QUEUE_FLAG_NAME(SAME_FORCE),
QUEUE_FLAG_NAME(INIT_DONE),
QUEUE_FLAG_NAME(STABLE_WRITES),
QUEUE_FLAG_NAME(POLL),
QUEUE_FLAG_NAME(DAX),
QUEUE_FLAG_NAME(STATS),

29
block/blk-sysfs.c
View File

@ -296,37 +296,10 @@ static ssize_t queue_##_name##_store(struct request_queue *q, \
return queue_feature_store(q, page, count, _feature); \
}
#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
static ssize_t \
queue_##name##_show(struct request_queue *q, char *page) \
{ \
int bit; \
bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
return queue_var_show(neg ? !bit : bit, page); \
} \
static ssize_t \
queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
{ \
unsigned long val; \
ssize_t ret; \
ret = queue_var_store(&val, page, count); \
if (ret < 0) \
return ret; \
if (neg) \
val = !val; \
\
if (val) \
blk_queue_flag_set(QUEUE_FLAG_##flag, q); \
else \
blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \
return ret; \
}
QUEUE_SYSFS_FEATURE(rotational, BLK_FEAT_ROTATIONAL)
QUEUE_SYSFS_FEATURE(add_random, BLK_FEAT_ADD_RANDOM)
QUEUE_SYSFS_FEATURE(iostats, BLK_FEAT_IO_STAT)
QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
#undef QUEUE_SYSFS_BIT_FNS
QUEUE_SYSFS_FEATURE(stable_writes, BLK_FEAT_STABLE_WRITES);
static ssize_t queue_zoned_show(struct request_queue *q, char *page)
{

5
drivers/block/drbd/drbd_main.c
View File

@ -2698,7 +2698,8 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
*/
.max_hw_sectors = DRBD_MAX_BIO_SIZE_SAFE >> 8,
.features = BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA |
BLK_FEAT_ROTATIONAL,
BLK_FEAT_ROTATIONAL |
BLK_FEAT_STABLE_WRITES,
};
device = minor_to_device(minor);
@ -2737,8 +2738,6 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
sprintf(disk->disk_name, "drbd%d", minor);
disk->private_data = device;
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, disk->queue);
device->md_io.page = alloc_page(GFP_KERNEL);
if (!device->md_io.page)
goto out_no_io_page;

9
drivers/block/rbd.c
View File

@ -4949,7 +4949,6 @@ static const struct blk_mq_ops rbd_mq_ops = {
static int rbd_init_disk(struct rbd_device *rbd_dev)
{
struct gendisk *disk;
struct request_queue *q;
unsigned int objset_bytes =
rbd_dev->layout.object_size * rbd_dev->layout.stripe_count;
struct queue_limits lim = {
@ -4979,12 +4978,14 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
lim.max_write_zeroes_sectors = objset_bytes >> SECTOR_SHIFT;
}
if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
lim.features |= BLK_FEAT_STABLE_WRITES;
disk = blk_mq_alloc_disk(&rbd_dev->tag_set, &lim, rbd_dev);
if (IS_ERR(disk)) {
err = PTR_ERR(disk);
goto out_tag_set;
}
q = disk->queue;
snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d",
rbd_dev->dev_id);
@ -4996,10 +4997,6 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
disk->minors = RBD_MINORS_PER_MAJOR;
disk->fops = &rbd_bd_ops;
disk->private_data = rbd_dev;
if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC))
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
rbd_dev->disk = disk;
return 0;

2
drivers/block/zram/zram_drv.c
View File

@ -2208,6 +2208,7 @@ static int zram_add(void)
#if ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE
.max_write_zeroes_sectors = UINT_MAX,
#endif
.features = BLK_FEAT_STABLE_WRITES,
};
struct zram *zram;
int ret, device_id;
@ -2246,7 +2247,6 @@ static int zram_add(void)
/* Actual capacity set using sysfs (/sys/block/zram<id>/disksize */
set_capacity(zram->disk, 0);
blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, zram->disk->queue);
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, zram->disk->queue);
ret = device_add_disk(NULL, zram->disk, zram_disk_groups);
if (ret)
goto out_cleanup_disk;

19
drivers/md/dm-table.c
View File

@ -1819,13 +1819,6 @@ static bool dm_table_supports_secure_erase(struct dm_table *t)
return true;
}
static int device_requires_stable_pages(struct dm_target *ti,
struct dm_dev *dev, sector_t start,
sector_t len, void *data)
{
return bdev_stable_writes(dev->bdev);
}
int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits)
{
@ -1862,18 +1855,6 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled, NULL))
dax_write_cache(t->md->dax_dev, true);
/*
* Some devices don't use blk_integrity but still want stable pages
* because they do their own checksumming.
* If any underlying device requires stable pages, a table must require
* them as well. Only targets that support iterate_devices are considered:
* don't want error, zero, etc to require stable pages.
*/
if (dm_table_any_dev_attr(t, device_requires_stable_pages, NULL))
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
else
blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q);
/*
* For a zoned target, setup the zones related queue attributes
* and resources necessary for zone append emulation if necessary.

6
drivers/md/raid5.c
View File

@ -7082,12 +7082,14 @@ raid5_store_skip_copy(struct mddev *mddev, const char *page, size_t len)
err = -ENODEV;
else if (new != conf->skip_copy) {
struct request_queue *q = mddev->gendisk->queue;
struct queue_limits lim = queue_limits_start_update(q);
conf->skip_copy = new;
if (new)
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, q);
lim.features |= BLK_FEAT_STABLE_WRITES;
else
blk_queue_flag_clear(QUEUE_FLAG_STABLE_WRITES, q);
lim.features &= ~BLK_FEAT_STABLE_WRITES;
err = queue_limits_commit_update(q, &lim);
}
mddev_unlock_and_resume(mddev);
return err ?: len;

5
drivers/mmc/core/queue.c
View File

@ -378,13 +378,14 @@ static struct gendisk *mmc_alloc_disk(struct mmc_queue *mq,
lim.max_segments = host->max_segs;
}
if (mmc_host_is_spi(host) && host->use_spi_crc)
lim.features |= BLK_FEAT_STABLE_WRITES;
disk = blk_mq_alloc_disk(&mq->tag_set, &lim, mq);
if (IS_ERR(disk))
return disk;
mq->queue = disk->queue;
if (mmc_host_is_spi(host) && host->use_spi_crc)
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, mq->queue);
blk_queue_rq_timeout(mq->queue, 60 * HZ);
dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));

9
drivers/nvme/host/core.c
View File

@ -3724,6 +3724,7 @@ static void nvme_ns_add_to_ctrl_list(struct nvme_ns *ns)
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info)
{
struct queue_limits lim = { };
struct nvme_ns *ns;
struct gendisk *disk;
int node = ctrl->numa_node;
@ -3732,7 +3733,10 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info)
if (!ns)
return;
disk = blk_mq_alloc_disk(ctrl->tagset, NULL, ns);
if (ctrl->opts && ctrl->opts->data_digest)
lim.features |= BLK_FEAT_STABLE_WRITES;
disk = blk_mq_alloc_disk(ctrl->tagset, &lim, ns);
if (IS_ERR(disk))
goto out_free_ns;
disk->fops = &nvme_bdev_ops;
@ -3741,9 +3745,6 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info)
ns->disk = disk;
ns->queue = disk->queue;
if (ctrl->opts && ctrl->opts->data_digest)
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, ns->queue);
if (ctrl->ops->supports_pci_p2pdma &&
ctrl->ops->supports_pci_p2pdma(ctrl))
blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue);

4
drivers/nvme/host/multipath.c
View File

@ -868,10 +868,6 @@ void nvme_mpath_add_disk(struct nvme_ns *ns, __le32 anagrpid)
nvme_mpath_set_live(ns);
}
if (test_bit(QUEUE_FLAG_STABLE_WRITES, &ns->queue->queue_flags) &&
ns->head->disk)
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
ns->head->disk->queue);
#ifdef CONFIG_BLK_DEV_ZONED
if (blk_queue_is_zoned(ns->queue) && ns->head->disk)
ns->head->disk->nr_zones = ns->disk->nr_zones;

8
drivers/scsi/iscsi_tcp.c
View File

@ -1057,15 +1057,15 @@ static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
return 0;
}
static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
static int iscsi_sw_tcp_device_configure(struct scsi_device *sdev,
struct queue_limits *lim)
{
struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
struct iscsi_session *session = tcp_sw_host->session;
struct iscsi_conn *conn = session->leadconn;
if (conn->datadgst_en)
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
sdev->request_queue);
lim->features |= BLK_FEAT_STABLE_WRITES;
return 0;
}
@ -1083,7 +1083,7 @@ static const struct scsi_host_template iscsi_sw_tcp_sht = {
.eh_device_reset_handler= iscsi_eh_device_reset,
.eh_target_reset_handler = iscsi_eh_recover_target,
.dma_boundary = PAGE_SIZE - 1,
.slave_configure = iscsi_sw_tcp_slave_configure,
.device_configure = iscsi_sw_tcp_device_configure,
.proc_name = "iscsi_tcp",
.this_id = -1,
.track_queue_depth = 1,

9
include/linux/blkdev.h
View File

@ -298,13 +298,17 @@ enum {
/* do disk/partitions IO accounting */
BLK_FEAT_IO_STAT = (1u << 4),
/* don't modify data until writeback is done */
BLK_FEAT_STABLE_WRITES = (1u << 5),
};
/*
* Flags automatically inherited when stacking limits.
*/
#define BLK_FEAT_INHERIT_MASK \
(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | BLK_FEAT_ROTATIONAL)
(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | BLK_FEAT_ROTATIONAL | \
BLK_FEAT_STABLE_WRITES)
/* internal flags in queue_limits.flags */
enum {
@ -565,7 +569,6 @@ struct request_queue {
#define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */
#define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
#define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
#define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
#define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
#define QUEUE_FLAG_DAX 19 /* device supports DAX */
#define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
@ -1323,7 +1326,7 @@ static inline bool bdev_stable_writes(struct block_device *bdev)
if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&
q->limits.integrity.csum_type != BLK_INTEGRITY_CSUM_NONE)
return true;
return test_bit(QUEUE_FLAG_STABLE_WRITES, &q->queue_flags);
return q->limits.features & BLK_FEAT_STABLE_WRITES;
}
static inline bool blk_queue_write_cache(struct request_queue *q)