[PATCH 17/26] block: move the stable_writes flag to queue_limits
Christoph Hellwig
hch at lst.de
Sun Jun 16 23:04:44 PDT 2024
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 at lst.de>
Reviewed-by: Damien Le Moal <dlemoal at kernel.org>
---
block/blk-mq-debugfs.c | 1 -
block/blk-sysfs.c | 29 +----------------------------
drivers/block/drbd/drbd_main.c | 5 ++---
drivers/block/rbd.c | 9 +++------
drivers/block/zram/zram_drv.c | 2 +-
drivers/md/dm-table.c | 19 -------------------
drivers/md/raid5.c | 6 ++++--
drivers/mmc/core/queue.c | 5 +++--
drivers/nvme/host/core.c | 9 +++++----
drivers/nvme/host/multipath.c | 4 ----
drivers/scsi/iscsi_tcp.c | 8 ++++----
include/linux/blkdev.h | 9 ++++++---
12 files changed, 29 insertions(+), 77 deletions(-)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index cbe99444ed1a54..eb73f1d348e5a9 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -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),
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 6f58530fb3c08e..cde525724831ef 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -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)
{
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 2ef29a47807550..f92673f05c7abc 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -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;
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index ec1f1c7d4275cd..008e850555f41a 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -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;
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index aad840fc7e18e3..f8f1b5b54795ac 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -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;
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 5d5431e531aea9..aaf379cb15d91f 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -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.
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 675c68fa6c6403..e875763d69917d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -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;
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index da00904d4a3c7e..d0b3ca8a11f071 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -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));
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 0d753fe71f35b0..5ecf762d7c8837 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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);
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index eea727cfa9e67d..173796f2ddea9f 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -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;
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 60688f18fac6f7..c708e105963833 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -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,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 5fafb2f95fd1a3..8936eb6ba60956 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -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)
--
2.43.0
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