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authorChristoph Hellwig <hch@lst.de>2018-10-12 19:08:49 +0900
committerJens Axboe <axboe@kernel.dk>2018-10-25 11:17:40 -0600
commite76239a3748c90a8b0e197f8f4544a8ce52f126e (patch)
tree4e555b7fe24f1642eecc1cfbca563897cfeb6d4a /drivers/scsi/sd.h
parent965b652e901886ea54f93c60027b5be76328d958 (diff)
block: add a report_zones method
Dispatching a report zones command through the request queue is a major pain due to the command reply payload rewriting necessary. Given that blkdev_report_zones() is executing everything synchronously, implement report zones as a block device file operation instead, allowing major simplification of the code in many places. sd, null-blk, dm-linear and dm-flakey being the only block device drivers supporting exposing zoned block devices, these drivers are modified to provide the device side implementation of the report_zones() block device file operation. For device mappers, a new report_zones() target type operation is defined so that the upper block layer calls blkdev_report_zones() can be propagated down to the underlying devices of the dm targets. Implementation for this new operation is added to the dm-linear and dm-flakey targets. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> [Damien] * Changed method block_device argument to gendisk * Various bug fixes and improvements * Added support for null_blk, dm-linear and dm-flakey. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/scsi/sd.h')
-rw-r--r--drivers/scsi/sd.h11
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index a7d4f50b67d4..f72f20fd0d8b 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -273,10 +273,12 @@ 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_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,
struct scsi_sense_hdr *sshdr);
+extern int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
+ struct blk_zone *zones, unsigned int *nr_zones,
+ gfp_t gfp_mask);
#else /* CONFIG_BLK_DEV_ZONED */
@@ -290,11 +292,6 @@ 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_setup_report_cmnd(struct scsi_cmnd *cmd)
-{
- return BLKPREP_INVALID;
-}
-
static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
{
return BLKPREP_INVALID;
@@ -304,6 +301,8 @@ static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
unsigned int good_bytes,
struct scsi_sense_hdr *sshdr) {}
+#define sd_zbc_report_zones NULL
+
#endif /* CONFIG_BLK_DEV_ZONED */
#endif /* _SCSI_DISK_H */