On 29/05/2024 06:04, Christoph Hellwig wrote:
Assign all queue limits through a local queue_limits variable and
queue_limits_commit_update so that we can't race updating them from
multiple places, and free the queue when updating them so that
in-progress I/O submissions don't see half-updated limits.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/scsi/sd.c | 126 ++++++++++++++++++++++++------------------
drivers/scsi/sd.h | 6 +-
drivers/scsi/sd_zbc.c | 15 ++---
3 files changed, 84 insertions(+), 63 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 2d08b69154b995..03e67936b27928 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -101,12 +101,13 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
#define SD_MINORS 16
-static void sd_config_discard(struct scsi_disk *, unsigned int);
-static void sd_config_write_same(struct scsi_disk *);
+static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
+ unsigned int mode);
Are there any reasons why we keep forward declarations like this?
AFAICS, this sd_config_discard forward declaration could be removed.
+static void sd_config_write_same(struct scsi_disk *sdkp,
+ struct queue_limits *lim);
static int sd_revalidate_disk(struct gendisk *);
static void sd_unlock_native_capacity(struct gendisk *disk);
static void sd_shutdown(struct device *);
-static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
static void scsi_disk_release(struct device *cdev);
static DEFINE_IDA(sd_index_ida);
@@ -456,7 +457,8 @@ provisioning_mode_store(struct device *dev, struct device_attribute *attr,
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
- int mode;
+ struct queue_limits lim;
+ int mode, err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
@@ -472,8 +474,13 @@ provisioning_mode_store(struct device *dev, struct device_attribute *attr,
if (mode < 0)
return -EINVAL;
- sd_config_discard(sdkp, mode);
-
+ lim = queue_limits_start_update(sdkp->disk->queue);
+ sd_config_discard(sdkp, &lim, mode);
+ blk_mq_freeze_queue(sdkp->disk->queue);
+ err = queue_limits_commit_update(sdkp->disk->queue, &lim);
+ blk_mq_unfreeze_queue(sdkp->disk->queue);
+ if (err)
+ return err;
return count;
}
static DEVICE_ATTR_RW(provisioning_mode);
@@ -556,6 +563,7 @@ max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
+ struct queue_limits lim;
unsigned long max;
int err;
@@ -577,8 +585,13 @@ max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
sdkp->max_ws_blocks = max;
}
- sd_config_write_same(sdkp);
-
+ lim = queue_limits_start_update(sdkp->disk->queue);
+ sd_config_write_same(sdkp, &lim);
+ blk_mq_freeze_queue(sdkp->disk->queue);
+ err = queue_limits_commit_update(sdkp->disk->queue, &lim);
+ blk_mq_unfreeze_queue(sdkp->disk->queue);
+ if (err)
+ return err;
return count;
}
static DEVICE_ATTR_RW(max_write_same_blocks);
@@ -827,17 +840,15 @@ static void sd_disable_discard(struct scsi_disk *sdkp)
blk_queue_max_discard_sectors(sdkp->disk->queue, 0);
}
-static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
+static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
+ unsigned int mode)
{
- struct request_queue *q = sdkp->disk->queue;
unsigned int logical_block_size = sdkp->device->sector_size;
unsigned int max_blocks = 0;
- q->limits.discard_alignment =
- sdkp->unmap_alignment * logical_block_size;
- q->limits.discard_granularity =
- max(sdkp->physical_block_size,
- sdkp->unmap_granularity * logical_block_size);
+ lim->discard_alignment = sdkp->unmap_alignment * logical_block_size;
+ lim->discard_granularity = max(sdkp->physical_block_size,
+ sdkp->unmap_granularity * logical_block_size);
sdkp->provisioning_mode = mode;
switch (mode) {
@@ -875,7 +886,8 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
break;
}
- blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
+ lim->max_hw_discard_sectors = max_blocks *
+ (logical_block_size >> SECTOR_SHIFT);
}
static void *sd_set_special_bvec(struct request *rq, unsigned int data_len)
@@ -1010,9 +1022,9 @@ static void sd_disable_write_same(struct scsi_disk *sdkp)
blk_queue_max_write_zeroes_sectors(sdkp->disk->queue, 0);
}
-static void sd_config_write_same(struct scsi_disk *sdkp)
+static void sd_config_write_same(struct scsi_disk *sdkp,
+ struct queue_limits *lim)
{
- struct request_queue *q = sdkp->disk->queue;
unsigned int logical_block_size = sdkp->device->sector_size;
if (sdkp->device->no_write_same) {
@@ -1066,8 +1078,8 @@ static void sd_config_write_same(struct scsi_disk *sdkp)
}
out:
- blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
- (logical_block_size >> 9));
+ lim->max_write_zeroes_sectors =
+ sdkp->max_ws_blocks * (logical_block_size >> 9);
Would it be ok to use SECTOR_SHIFT here? A similar change is made in
sd_config_discard(), above
}
static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
@@ -2523,7 +2535,7 @@ static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
#define READ_CAPACITY_RETRIES_ON_RESET 10
static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
- unsigned char *buffer)
+ struct queue_limits *lim, unsigned char *buffer)
{
unsigned char cmd[16];
struct scsi_sense_hdr sshdr;
@@ -2597,7 +2609,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
/* Lowest aligned logical block */
alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
- blk_queue_alignment_offset(sdp->request_queue, alignment);
+ lim->alignment_offset = alignment;
if (alignment && sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"physical block alignment offset: %u\n", alignment);
@@ -2608,7 +2620,7 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
if (buffer[14] & 0x40) /* LBPRZ */
sdkp->lbprz = 1;
- sd_config_discard(sdkp, SD_LBP_WS16);
+ sd_config_discard(sdkp, lim, SD_LBP_WS16);
}
sdkp->capacity = lba + 1;
@@ -2711,13 +2723,14 @@ static int sd_try_rc16_first(struct scsi_device *sdp)
* read disk capacity
*/
static void
-sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
+sd_read_capacity(struct scsi_disk *sdkp, struct queue_limits *lim,
+ unsigned char *buffer)
{
int sector_size;
struct scsi_device *sdp = sdkp->device;
if (sd_try_rc16_first(sdp)) {
- sector_size = read_capacity_16(sdkp, sdp, buffer);
+ sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
if (sector_size == -EOVERFLOW)
goto got_data;
if (sector_size == -ENODEV)
@@ -2737,7 +2750,7 @@ sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
int old_sector_size = sector_size;
sd_printk(KERN_NOTICE, sdkp, "Very big device. "
"Trying to use READ CAPACITY(16).\n");
- sector_size = read_capacity_16(sdkp, sdp, buffer);
+ sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
if (sector_size < 0) {
sd_printk(KERN_NOTICE, sdkp,
"Using 0xffffffff as device size\n");
@@ -2796,9 +2809,8 @@ sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
*/
sector_size = 512;
}
- blk_queue_logical_block_size(sdp->request_queue, sector_size);
- blk_queue_physical_block_size(sdp->request_queue,
- sdkp->physical_block_size);
+ lim->logical_block_size = sector_size;
+ lim->physical_block_size = sdkp->physical_block_size;
sdkp->device->sector_size = sector_size;
if (sdkp->capacity > 0xffffffff)
@@ -3220,11 +3232,11 @@ static unsigned int sd_discard_mode(struct scsi_disk *sdkp)
return SD_LBP_DISABLE;
}
-/**
- * sd_read_block_limits - Query disk device for preferred I/O sizes.
- * @sdkp: disk to query
+/*
+ * Query disk device for preferred I/O sizes.
*/
-static void sd_read_block_limits(struct scsi_disk *sdkp)
+static void sd_read_block_limits(struct scsi_disk *sdkp,
+ struct queue_limits *lim)
{
struct scsi_vpd *vpd;
@@ -3258,7 +3270,7 @@ static void sd_read_block_limits(struct scsi_disk *sdkp)
sdkp->unmap_alignment =
get_unaligned_be32(&vpd->data[32]) & ~(1 << 31);
- sd_config_discard(sdkp, sd_discard_mode(sdkp));
+ sd_config_discard(sdkp, lim, sd_discard_mode(sdkp));
}
out:
@@ -3278,10 +3290,10 @@ static void sd_read_block_limits_ext(struct scsi_disk *sdkp)
}
/**
below is not a kernel doc comment
- * sd_read_block_characteristics - Query block dev. characteristics
- * @sdkp: disk to query
+ * Query block dev. characteristics
*/
-static void sd_read_block_characteristics(struct scsi_disk *sdkp)
+static void sd_read_block_characteristics(struct scsi_disk *sdkp,
+ struct queue_limits *lim)
{
struct request_queue *q = sdkp->disk->queue;
struct scsi_vpd *vpd;
@@ -3307,29 +3319,26 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp)
#ifdef CONFIG_BLK_DEV_ZONED /* sd_probe rejects ZBD devices early otherwise */
if (sdkp->device->type == TYPE_ZBC) {
- /*
- * Host-managed.
- */
- disk_set_zoned(sdkp->disk);
+ lim->zoned = true;
/*
* Per ZBC and ZAC specifications, writes in sequential write
* required zones of host-managed devices must be aligned to
* the device physical block size.
*/
- blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
+ lim->zone_write_granularity = sdkp->physical_block_size;
} else {
/*
* Host-aware devices are treated as conventional.
*/
- WARN_ON_ONCE(blk_queue_is_zoned(q));
+ lim->zoned = false;
}
#endif /* CONFIG_BLK_DEV_ZONED */
if (!sdkp->first_scan)
return;
- if (blk_queue_is_zoned(q))
+ if (lim->zoned)
sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n");
else if (sdkp->zoned == 1)
sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n");
@@ -3605,8 +3614,10 @@ static int sd_revalidate_disk(struct gendisk *disk)
struct scsi_device *sdp = sdkp->device;
struct request_queue *q = sdkp->disk->queue;
sector_t old_capacity = sdkp->capacity;
+ struct queue_limits lim;
unsigned char *buffer;
unsigned int dev_max;
+ int err;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
"sd_revalidate_disk\n"));
@@ -3627,12 +3638,14 @@ static int sd_revalidate_disk(struct gendisk *disk)
sd_spinup_disk(sdkp);
+ lim = queue_limits_start_update(sdkp->disk->queue);
+
/*
* Without media there is no reason to ask; moreover, some devices
* react badly if we do.
*/
if (sdkp->media_present) {
- sd_read_capacity(sdkp, buffer);
+ sd_read_capacity(sdkp, &lim, buffer);
/*
* Some USB/UAS devices return generic values for mode pages
* until the media has been accessed. Trigger a READ operation
@@ -3651,10 +3664,10 @@ static int sd_revalidate_disk(struct gendisk *disk)
if (scsi_device_supports_vpd(sdp)) {
sd_read_block_provisioning(sdkp);
- sd_read_block_limits(sdkp);
+ sd_read_block_limits(sdkp, &lim);
sd_read_block_limits_ext(sdkp);
- sd_read_block_characteristics(sdkp);
- sd_zbc_read_zones(sdkp, buffer);
+ sd_read_block_characteristics(sdkp, &lim);
+ sd_zbc_read_zones(sdkp, &lim, buffer);
sd_read_cpr(sdkp);
}
@@ -3683,28 +3696,33 @@ static int sd_revalidate_disk(struct gendisk *disk)
q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
is setting q->limits.max_dev_sectors directly proper?
if (sd_validate_min_xfer_size(sdkp))
- blk_queue_io_min(sdkp->disk->queue,
- logical_to_bytes(sdp, sdkp->min_xfer_blocks));
+ lim.io_min = logical_to_bytes(sdp, sdkp->min_xfer_blocks);
else
- blk_queue_io_min(sdkp->disk->queue, 0);
+ lim.io_min = 0;
/*
* Limit default to SCSI host optimal sector limit if set. There may be
* an impact on performance for when the size of a request exceeds this
* host limit.
*/
- q->limits.io_opt = sdp->host->opt_sectors << SECTOR_SHIFT;
+ lim.io_opt = sdp->host->opt_sectors << SECTOR_SHIFT;
if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
- q->limits.io_opt = min_not_zero(q->limits.io_opt,
+ lim.io_opt = min_not_zero(lim.io_opt,
logical_to_bytes(sdp, sdkp->opt_xfer_blocks));
}
sdkp->first_scan = 0;
set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity));
- sd_config_write_same(sdkp);
+ sd_config_write_same(sdkp, &lim);
kfree(buffer);
