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sd: Implement support for ZBC devices

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Implement ZBC support functions to setup zoned disks, both
host-managed and host-aware models. Only zoned disks that satisfy
the following conditions are supported:
1) All zones are the same size, with the exception of an eventual
   last smaller runt zone.
2) For host-managed disks, reads are unrestricted (reads are not
   failed due to zone or write pointer alignement constraints).
Zoned disks that do not satisfy these 2 conditions are setup with
a capacity of 0 to prevent their use.

The function sd_zbc_read_zones, called from sd_revalidate_disk,
checks that the device satisfies the above two constraints. This
function may also change the disk capacity previously set by
sd_read_capacity for devices reporting only the capacity of
conventional zones at the beginning of the LBA range (i.e. devices
reporting rc_basis set to 0).

The capacity message output was moved out of sd_read_capacity into
a new function sd_print_capacity to include this eventual capacity
change by sd_zbc_read_zones. This new function also includes a call
to sd_zbc_print_zones to display the number of zones and zone size
of the device.

Signed-off-by: Hannes Reinecke <hare@suse.de>

[Damien: * Removed zone cache support
         * Removed mapping of discard to reset write pointer command
         * Modified sd_zbc_read_zones to include checks that the
           device satisfies the kernel constraints
         * Implemeted REPORT ZONES setup and post-processing based
           on code from Shaun Tancheff <shaun.tancheff@seagate.com>
         * Removed confusing use of 512B sector units in functions
           interface]
Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Hannes Reinecke
2016-10-18 15:40:34 +09:00
committed by Jens Axboe
parent 3ed05a987e
commit 89d9475610
5 changed files with 845 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/scsi/sd.h
View File

@@ -64,6 +64,15 @@ struct scsi_disk {
struct scsi_device *device;
struct device dev;
struct gendisk *disk;
#ifdef CONFIG_BLK_DEV_ZONED
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;
#endif
atomic_t openers;
sector_t capacity; /* size in logical blocks */
u32 max_xfer_blocks;
@@ -94,6 +103,9 @@ struct scsi_disk {
unsigned lbpvpd : 1;
unsigned ws10 : 1;
unsigned ws16 : 1;
unsigned rc_basis: 2;
unsigned zoned: 2;
unsigned urswrz : 1;
};
#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
@@ -156,6 +168,11 @@ static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t b
return blocks * sdev->sector_size;
}
static inline sector_t sectors_to_logical(struct scsi_device *sdev, sector_t sector)
{
return sector >> (ilog2(sdev->sector_size) - 9);
}
/*
* Look up the DIX operation based on whether the command is read or
* write and whether dix and dif are enabled.
@@ -239,4 +256,57 @@ static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
#endif /* CONFIG_BLK_DEV_INTEGRITY */
static inline int sd_is_zoned(struct scsi_disk *sdkp)
{
return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
}
#ifdef CONFIG_BLK_DEV_ZONED
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_write_cmnd(struct scsi_cmnd *cmd);
extern void sd_zbc_cancel_write_cmnd(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,
struct scsi_sense_hdr *sshdr);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
unsigned char *buf)
{
return 0;
}
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_write_cmnd(struct scsi_cmnd *cmd)
{
/* Let the drive fail requests */
return BLKPREP_OK;
}
static inline void sd_zbc_cancel_write_cmnd(struct scsi_cmnd *cmd) {}
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;
}
static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
unsigned int good_bytes,
struct scsi_sense_hdr *sshdr) {}
#endif /* CONFIG_BLK_DEV_ZONED */
#endif /* _SCSI_DISK_H */