The block layer now handles zone write locking.
Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
---
drivers/scsi/sd.c | 41 +++---------------
drivers/scsi/sd.h | 11 -----
drivers/scsi/sd_zbc.c | 105 +++++++----------------------------------------
include/scsi/scsi_cmnd.h | 3 +-
4 files changed, 21 insertions(+), 139 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index fb9f8b5f4673..2d5b0f84ff14 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -835,16 +835,13 @@ static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd
*cmd)
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
- int ret;
if (!(rq->cmd_flags & REQ_NOUNMAP)) {
switch (sdkp->zeroing_mode) {
case SD_ZERO_WS16_UNMAP:
- ret = sd_setup_write_same16_cmnd(cmd, true);
- goto out;
+ return sd_setup_write_same16_cmnd(cmd, true);
case SD_ZERO_WS10_UNMAP:
- ret = sd_setup_write_same10_cmnd(cmd, true);
- goto out;
+ return sd_setup_write_same10_cmnd(cmd, true);
}
}
@@ -852,15 +849,9 @@ static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd
*cmd)
return BLKPREP_INVALID;
if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
- ret = sd_setup_write_same16_cmnd(cmd, false);
- else
- ret = sd_setup_write_same10_cmnd(cmd, false);
-
-out:
- if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
- return sd_zbc_write_lock_zone(cmd);
+ return sd_setup_write_same16_cmnd(cmd, false);
- return ret;
+ return sd_setup_write_same10_cmnd(cmd, false);
}
static void sd_config_write_same(struct scsi_disk *sdkp)
@@ -928,12 +919,6 @@ static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
- if (sd_is_zoned(sdkp)) {
- ret = sd_zbc_write_lock_zone(cmd);
- if (ret != BLKPREP_OK)
- return ret;
- }
-
sector >>= ilog2(sdp->sector_size) - 9;
nr_sectors >>= ilog2(sdp->sector_size) - 9;
@@ -968,9 +953,6 @@ static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
ret = scsi_init_io(cmd);
rq->__data_len = nr_bytes;
- if (sd_is_zoned(sdkp) && ret != BLKPREP_OK)
- sd_zbc_write_unlock_zone(cmd);
-
return ret;
}
@@ -1000,19 +982,12 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd
*SCpnt)
sector_t threshold;
unsigned int this_count = blk_rq_sectors(rq);
unsigned int dif, dix;
- bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
int ret;
unsigned char protect;
- if (zoned_write) {
- ret = sd_zbc_write_lock_zone(SCpnt);
- if (ret != BLKPREP_OK)
- return ret;
- }
-
ret = scsi_init_io(SCpnt);
if (ret != BLKPREP_OK)
- goto out;
+ return ret;
WARN_ON_ONCE(SCpnt != rq->special);
/* from here on until we're complete, any goto out
@@ -1231,9 +1206,6 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd
*SCpnt)
*/
ret = BLKPREP_OK;
out:
- if (zoned_write && ret != BLKPREP_OK)
- sd_zbc_write_unlock_zone(SCpnt);
-
return ret;
}
@@ -1277,9 +1249,6 @@ static void sd_uninit_command(struct scsi_cmnd *SCpnt)
{
struct request *rq = SCpnt->request;
- if (SCpnt->flags & SCMD_ZONE_WRITE_LOCK)
- sd_zbc_write_unlock_zone(SCpnt);
-
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
__free_page(rq->special_vec.bv_page);
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 99c4dde9b6bf..112627c1cc85 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -76,7 +76,6 @@ struct scsi_disk {
unsigned int nr_zones;
unsigned int zone_blocks;
unsigned int zone_shift;
- unsigned long *zones_wlock;
unsigned int zones_optimal_open;
unsigned int zones_optimal_nonseq;
unsigned int zones_max_open;
@@ -282,8 +281,6 @@ static inline int sd_is_zoned(struct scsi_disk *sdkp)
extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
extern void sd_zbc_remove(struct scsi_disk *sdkp);
extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
-extern int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd);
-extern void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd);
extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
@@ -301,14 +298,6 @@ static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
-static inline int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
-{
- /* Let the drive fail requests */
- return BLKPREP_OK;
-}
-
-static inline void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) {}
-
static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
{
return BLKPREP_INVALID;
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index a1bbb5b397e1..d2121e7738d7 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -230,17 +230,6 @@ static inline sector_t sd_zbc_zone_sectors(struct
scsi_disk *sdkp)
}
/**
- * sd_zbc_zone_no - Get the number of the zone conataining a sector.
- * @sdkp: The target disk
- * @sector: 512B sector address contained in the zone
- */
-static inline unsigned int sd_zbc_zone_no(struct scsi_disk *sdkp,
- sector_t sector)
-{
- return sectors_to_logical(sdkp->device, sector) >> sdkp->zone_shift;
-}
-
-/**
* sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
* @cmd: the command to setup
*
@@ -279,78 +268,6 @@ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
}
/**
- * sd_zbc_write_lock_zone - Write lock a sequential zone.
- * @cmd: write command
- *
- * Called from sd_init_cmd() for write requests (standard write, write same or
- * write zeroes operations). If the request target zone is not already locked,
- * the zone is locked and BLKPREP_OK returned, allowing the request to proceed
- * through dispatch in scsi_request_fn(). Otherwise, BLKPREP_DEFER is returned,
- * forcing the request to wait for the zone to be unlocked, that is, for the
- * previously issued write request targeting the same zone to complete.
- *
- * This is called from blk_peek_request() context with the queue lock held and
- * before the request is removed from the scheduler. As a result, multiple
- * contexts executing concurrently scsi_request_fn() cannot result in write
- * sequence reordering as only a single write request per zone is allowed to
- * proceed.
- */
-int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
-{
- struct request *rq = cmd->request;
- struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
- sector_t sector = blk_rq_pos(rq);
- sector_t zone_sectors = sd_zbc_zone_sectors(sdkp);
- unsigned int zno = sd_zbc_zone_no(sdkp, sector);
-
- /*
- * Note: Checks of the alignment of the write command on
- * logical blocks is done in sd.c
- */
-
- /* Do not allow zone boundaries crossing on host-managed drives */
- if (blk_queue_zoned_model(sdkp->disk->queue) == BLK_ZONED_HM &&
- (sector & (zone_sectors - 1)) + blk_rq_sectors(rq) > zone_sectors)
- return BLKPREP_KILL;
-
- /*
- * Do not issue more than one write at a time per
- * zone. This solves write ordering problems due to
- * the unlocking of the request queue in the dispatch
- * path in the non scsi-mq case.
- */
- if (sdkp->zones_wlock &&
- test_and_set_bit(zno, sdkp->zones_wlock))
- return BLKPREP_DEFER;
-
- WARN_ON_ONCE(cmd->flags & SCMD_ZONE_WRITE_LOCK);
- cmd->flags |= SCMD_ZONE_WRITE_LOCK;
-
- return BLKPREP_OK;
-}
-
-/**
- * sd_zbc_write_unlock_zone - Write unlock a sequential zone.
- * @cmd: write command
- *
- * Called from sd_uninit_cmd(). Unlocking the request target zone will allow
- * dispatching the next write request for the zone.
- */
-void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd)
-{
- struct request *rq = cmd->request;
- struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
-
- if (sdkp->zones_wlock && cmd->flags & SCMD_ZONE_WRITE_LOCK) {
- unsigned int zno = sd_zbc_zone_no(sdkp, blk_rq_pos(rq));
- WARN_ON_ONCE(!test_bit(zno, sdkp->zones_wlock));
- cmd->flags &= ~SCMD_ZONE_WRITE_LOCK;
- clear_bit_unlock(zno, sdkp->zones_wlock);
- smp_mb__after_atomic();
- }
-}
-
-/**
* sd_zbc_complete - ZBC command post processing.
* @cmd: Completed command
* @good_bytes: Command reply bytes
@@ -693,8 +610,10 @@ static void sd_zbc_cleanup(struct scsi_disk *sdkp)
kfree(q->seq_zones_bitmap);
q->seq_zones_bitmap = NULL;
- kfree(sdkp->zones_wlock);
- sdkp->zones_wlock = NULL;
+ kfree(q->seq_zones_wlock);
+ q->seq_zones_wlock = NULL;
+
+ q->nr_zones = 0;
}
static int sd_zbc_setup(struct scsi_disk *sdkp)
@@ -719,23 +638,29 @@ static int sd_zbc_setup(struct scsi_disk *sdkp)
if (sdkp->first_scan)
return 0;
- if (!sdkp->zones_wlock) {
- sdkp->zones_wlock = sd_zbc_alloc_zone_bitmap(sdkp);
- if (!sdkp->zones_wlock)
- return -ENOMEM;
+ if (!q->seq_zones_wlock) {
+ q->seq_zones_wlock = sd_zbc_alloc_zone_bitmap(sdkp);
+ if (!q->seq_zones_wlock) {
+ ret = -ENOMEM;
+ goto err;
+ }
}
if (!q->seq_zones_bitmap) {
ret = sd_zbc_setup_seq_zones_bitmap(sdkp);
if (ret) {
sd_zbc_cleanup(sdkp);
- return ret;
+ goto err;
}
}
q->nr_zones = sdkp->nr_zones;
return 0;
+
+err:
+ sd_zbc_cleanup(sdkp);
+ return ret;
}
int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 3d3f8b342e05..04477648aa1a 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -57,8 +57,7 @@ struct scsi_pointer {
/* for scmd->flags */
#define SCMD_TAGGED (1 << 0)
#define SCMD_UNCHECKED_ISA_DMA (1 << 1)
-#define SCMD_ZONE_WRITE_LOCK (1 << 2)
-#define SCMD_INITIALIZED (1 << 3)
+#define SCMD_INITIALIZED (1 << 2)
/* flags preserved across unprep / reprep */
#define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED)
--
2.13.6
