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scsi: sd: Remove zone write locking 

The block layer now handles zone write locking.

[mkp: removed SCMD_ZONE_WRITE_LOCK reference in scsi_debugfs]

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal 2017-12-21 15:43:44 +09:00 committed by Martin K. Petersen
parent 23349ca93a
commit 39051dd85f
5 changed files with 6 additions and 133 deletions
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1
drivers/scsi/scsi_debugfs.c
View File

@ -8,7 +8,6 @@
static const char *const scsi_cmd_flags[] = {
SCSI_CMD_FLAG_NAME(TAGGED),
SCSI_CMD_FLAG_NAME(UNCHECKED_ISA_DMA),
SCSI_CMD_FLAG_NAME(ZONE_WRITE_LOCK),
SCSI_CMD_FLAG_NAME(INITIALIZED),
};
#undef SCSI_CMD_FLAG_NAME

41
drivers/scsi/sd.c
View File

@ -851,16 +851,13 @@ 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);
}
}
@ -868,15 +865,9 @@ 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);
return sd_setup_write_same16_cmnd(cmd, false);
out:
if (sd_is_zoned(sdkp) && ret == BLKPREP_OK)
return sd_zbc_write_lock_zone(cmd);
return ret;
return sd_setup_write_same10_cmnd(cmd, false);
}
static void sd_config_write_same(struct scsi_disk *sdkp)
@ -964,12 +955,6 @@ 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;
@ -1004,9 +989,6 @@ 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;
}
@ -1036,19 +1018,12 @@ 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
@ -1267,9 +1242,6 @@ 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;
}
@ -1314,9 +1286,6 @@ static void sd_uninit_command(struct scsi_cmnd *SCpnt)
struct request *rq = SCpnt->request;
u8 *cmnd;
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);

11
drivers/scsi/sd.h
View File

@ -77,7 +77,6 @@ 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;
@ -283,8 +282,6 @@ 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,
@ -302,14 +299,6 @@ 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;

83
drivers/scsi/sd_zbc.c
View File

@ -229,17 +229,6 @@ static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
}
/**
* 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
@ -278,78 +267,6 @@ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
return BLKPREP_OK;
}
/**
* 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

3
include/scsi/scsi_cmnd.h
View File

@ -58,8 +58,7 @@ 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)