linux/drivers/scsi/sd_zbc.c
Linus Torvalds 72f02ba66b SCSI misc on 20180815
This is mostly updates to the usual drivers: mpt3sas, lpfc, qla2xxx,
 hisi_sas, smartpqi, megaraid_sas, arcmsr.  In addition, with the
 continuing absence of Nic we have target updates for tcmu and target
 core (all with reviews and acks).  The biggest observable change is
 going to be that we're (again) trying to switch to mulitqueue as the
 default (a user can still override the setting on the kernel command
 line).  Other major core stuff is the removal of the remaining
 Microchannel drivers, an update of the internal timers and some
 reworks of completion and result handling.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com>
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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI updates from James Bottomley:
 "This is mostly updates to the usual drivers: mpt3sas, lpfc, qla2xxx,
  hisi_sas, smartpqi, megaraid_sas, arcmsr.

  In addition, with the continuing absence of Nic we have target updates
  for tcmu and target core (all with reviews and acks).

  The biggest observable change is going to be that we're (again) trying
  to switch to mulitqueue as the default (a user can still override the
  setting on the kernel command line).

  Other major core stuff is the removal of the remaining Microchannel
  drivers, an update of the internal timers and some reworks of
  completion and result handling"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (203 commits)
  scsi: core: use blk_mq_run_hw_queues in scsi_kick_queue
  scsi: ufs: remove unnecessary query(DM) UPIU trace
  scsi: qla2xxx: Fix issue reported by static checker for qla2x00_els_dcmd2_sp_done()
  scsi: aacraid: Spelling fix in comment
  scsi: mpt3sas: Fix calltrace observed while running IO & reset
  scsi: aic94xx: fix an error code in aic94xx_init()
  scsi: st: remove redundant pointer STbuffer
  scsi: qla2xxx: Update driver version to 10.00.00.08-k
  scsi: qla2xxx: Migrate NVME N2N handling into state machine
  scsi: qla2xxx: Save frame payload size from ICB
  scsi: qla2xxx: Fix stalled relogin
  scsi: qla2xxx: Fix race between switch cmd completion and timeout
  scsi: qla2xxx: Fix Management Server NPort handle reservation logic
  scsi: qla2xxx: Flush mailbox commands on chip reset
  scsi: qla2xxx: Fix unintended Logout
  scsi: qla2xxx: Fix session state stuck in Get Port DB
  scsi: qla2xxx: Fix redundant fc_rport registration
  scsi: qla2xxx: Silent erroneous message
  scsi: qla2xxx: Prevent sysfs access when chip is down
  scsi: qla2xxx: Add longer window for chip reset
  ...
2018-08-15 22:06:26 -07:00

748 lines
18 KiB
C

/*
* SCSI Zoned Block commands
*
* Copyright (C) 2014-2015 SUSE Linux GmbH
* Written by: Hannes Reinecke <hare@suse.de>
* Modified by: Damien Le Moal <damien.lemoal@hgst.com>
* Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
* USA.
*
*/
#include <linux/blkdev.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include "sd.h"
/**
* sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
* @sdkp: The disk the report originated from
* @buf: Address of the report zone descriptor
* @zone: the destination zone structure
*
* All LBA sized values are converted to 512B sectors unit.
*/
static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
struct blk_zone *zone)
{
struct scsi_device *sdp = sdkp->device;
memset(zone, 0, sizeof(struct blk_zone));
zone->type = buf[0] & 0x0f;
zone->cond = (buf[1] >> 4) & 0xf;
if (buf[1] & 0x01)
zone->reset = 1;
if (buf[1] & 0x02)
zone->non_seq = 1;
zone->len = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
zone->start = logical_to_sectors(sdp, get_unaligned_be64(&buf[16]));
zone->wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
if (zone->type != ZBC_ZONE_TYPE_CONV &&
zone->cond == ZBC_ZONE_COND_FULL)
zone->wp = zone->start + zone->len;
}
/**
* sd_zbc_report_zones - Issue a REPORT ZONES scsi command.
* @sdkp: The target disk
* @buf: Buffer to use for the reply
* @buflen: the buffer size
* @lba: Start LBA of the report
*
* For internal use during device validation.
*/
static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
unsigned int buflen, sector_t lba)
{
struct scsi_device *sdp = sdkp->device;
const int timeout = sdp->request_queue->rq_timeout;
struct scsi_sense_hdr sshdr;
unsigned char cmd[16];
unsigned int rep_len;
int result;
memset(cmd, 0, 16);
cmd[0] = ZBC_IN;
cmd[1] = ZI_REPORT_ZONES;
put_unaligned_be64(lba, &cmd[2]);
put_unaligned_be32(buflen, &cmd[10]);
memset(buf, 0, buflen);
result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
buf, buflen, &sshdr,
timeout, SD_MAX_RETRIES, NULL);
if (result) {
sd_printk(KERN_ERR, sdkp,
"REPORT ZONES lba %llu failed with %d/%d\n",
(unsigned long long)lba,
host_byte(result), driver_byte(result));
return -EIO;
}
rep_len = get_unaligned_be32(&buf[0]);
if (rep_len < 64) {
sd_printk(KERN_ERR, sdkp,
"REPORT ZONES report invalid length %u\n",
rep_len);
return -EIO;
}
return 0;
}
/**
* sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command
* @cmd: The command to setup
*
* Call in sd_init_command() for a REQ_OP_ZONE_REPORT request.
*/
int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
sector_t lba, sector = blk_rq_pos(rq);
unsigned int nr_bytes = blk_rq_bytes(rq);
int ret;
WARN_ON(nr_bytes == 0);
if (!sd_is_zoned(sdkp))
/* Not a zoned device */
return BLKPREP_KILL;
ret = scsi_init_io(cmd);
if (ret != BLKPREP_OK)
return ret;
cmd->cmd_len = 16;
memset(cmd->cmnd, 0, cmd->cmd_len);
cmd->cmnd[0] = ZBC_IN;
cmd->cmnd[1] = ZI_REPORT_ZONES;
lba = sectors_to_logical(sdkp->device, sector);
put_unaligned_be64(lba, &cmd->cmnd[2]);
put_unaligned_be32(nr_bytes, &cmd->cmnd[10]);
/* Do partial report for speeding things up */
cmd->cmnd[14] = ZBC_REPORT_ZONE_PARTIAL;
cmd->sc_data_direction = DMA_FROM_DEVICE;
cmd->sdb.length = nr_bytes;
cmd->transfersize = sdkp->device->sector_size;
cmd->allowed = 0;
return BLKPREP_OK;
}
/**
* sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply.
* @scmd: The completed report zones command
* @good_bytes: reply size in bytes
*
* Convert all reported zone descriptors to struct blk_zone. The conversion
* is done in-place, directly in the request specified sg buffer.
*/
static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
unsigned int good_bytes)
{
struct request *rq = scmd->request;
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
struct sg_mapping_iter miter;
struct blk_zone_report_hdr hdr;
struct blk_zone zone;
unsigned int offset, bytes = 0;
unsigned long flags;
u8 *buf;
if (good_bytes < 64)
return;
memset(&hdr, 0, sizeof(struct blk_zone_report_hdr));
sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
SG_MITER_TO_SG | SG_MITER_ATOMIC);
local_irq_save(flags);
while (sg_miter_next(&miter) && bytes < good_bytes) {
buf = miter.addr;
offset = 0;
if (bytes == 0) {
/* Set the report header */
hdr.nr_zones = min_t(unsigned int,
(good_bytes - 64) / 64,
get_unaligned_be32(&buf[0]) / 64);
memcpy(buf, &hdr, sizeof(struct blk_zone_report_hdr));
offset += 64;
bytes += 64;
}
/* Parse zone descriptors */
while (offset < miter.length && hdr.nr_zones) {
WARN_ON(offset > miter.length);
buf = miter.addr + offset;
sd_zbc_parse_report(sdkp, buf, &zone);
memcpy(buf, &zone, sizeof(struct blk_zone));
offset += 64;
bytes += 64;
hdr.nr_zones--;
}
if (!hdr.nr_zones)
break;
}
sg_miter_stop(&miter);
local_irq_restore(flags);
}
/**
* sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
* @sdkp: The target disk
*/
static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
{
return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
}
/**
* sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
* @cmd: the command to setup
*
* Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
*/
int sd_zbc_setup_reset_cmnd(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 block = sectors_to_logical(sdkp->device, sector);
if (!sd_is_zoned(sdkp))
/* Not a zoned device */
return BLKPREP_KILL;
if (sdkp->device->changed)
return BLKPREP_KILL;
if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
/* Unaligned request */
return BLKPREP_KILL;
cmd->cmd_len = 16;
memset(cmd->cmnd, 0, cmd->cmd_len);
cmd->cmnd[0] = ZBC_OUT;
cmd->cmnd[1] = ZO_RESET_WRITE_POINTER;
put_unaligned_be64(block, &cmd->cmnd[2]);
rq->timeout = SD_TIMEOUT;
cmd->sc_data_direction = DMA_NONE;
cmd->transfersize = 0;
cmd->allowed = 0;
return BLKPREP_OK;
}
/**
* sd_zbc_complete - ZBC command post processing.
* @cmd: Completed command
* @good_bytes: Command reply bytes
* @sshdr: command sense header
*
* Called from sd_done(). Process report zones reply and handle reset zone
* and write commands errors.
*/
void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
struct scsi_sense_hdr *sshdr)
{
int result = cmd->result;
struct request *rq = cmd->request;
switch (req_op(rq)) {
case REQ_OP_ZONE_RESET:
if (result &&
sshdr->sense_key == ILLEGAL_REQUEST &&
sshdr->asc == 0x24)
/*
* INVALID FIELD IN CDB error: reset of a conventional
* zone was attempted. Nothing to worry about, so be
* quiet about the error.
*/
rq->rq_flags |= RQF_QUIET;
break;
case REQ_OP_WRITE:
case REQ_OP_WRITE_ZEROES:
case REQ_OP_WRITE_SAME:
break;
case REQ_OP_ZONE_REPORT:
if (!result)
sd_zbc_report_zones_complete(cmd, good_bytes);
break;
}
}
/**
* sd_zbc_read_zoned_characteristics - Read zoned block device characteristics
* @sdkp: Target disk
* @buf: Buffer where to store the VPD page data
*
* Read VPD page B6.
*/
static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
unsigned char *buf)
{
if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
sd_printk(KERN_NOTICE, sdkp,
"Unconstrained-read check failed\n");
return -ENODEV;
}
if (sdkp->device->type != TYPE_ZBC) {
/* Host-aware */
sdkp->urswrz = 1;
sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
sdkp->zones_max_open = 0;
} else {
/* Host-managed */
sdkp->urswrz = buf[4] & 1;
sdkp->zones_optimal_open = 0;
sdkp->zones_optimal_nonseq = 0;
sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
}
return 0;
}
/**
* sd_zbc_check_capacity - Check reported capacity.
* @sdkp: Target disk
* @buf: Buffer to use for commands
*
* ZBC drive may report only the capacity of the first conventional zones at
* LBA 0. This is indicated by the RC_BASIS field of the read capacity reply.
* Check this here. If the disk reported only its conventional zones capacity,
* get the total capacity by doing a report zones.
*/
static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf)
{
sector_t lba;
int ret;
if (sdkp->rc_basis != 0)
return 0;
/* Do a report zone to get the maximum LBA to check capacity */
ret = sd_zbc_report_zones(sdkp, buf, SD_BUF_SIZE, 0);
if (ret)
return ret;
/* The max_lba field is the capacity of this device */
lba = get_unaligned_be64(&buf[8]);
if (lba + 1 == sdkp->capacity)
return 0;
if (sdkp->first_scan)
sd_printk(KERN_WARNING, sdkp,
"Changing capacity from %llu to max LBA+1 %llu\n",
(unsigned long long)sdkp->capacity,
(unsigned long long)lba + 1);
sdkp->capacity = lba + 1;
return 0;
}
#define SD_ZBC_BUF_SIZE 131072U
/**
* sd_zbc_check_zone_size - Check the device zone sizes
* @sdkp: Target disk
*
* Check that all zones of the device are equal. The last zone can however
* be smaller. The zone size must also be a power of two number of LBAs.
*
* Returns the zone size in number of blocks upon success or an error code
* upon failure.
*/
static s64 sd_zbc_check_zone_size(struct scsi_disk *sdkp)
{
u64 zone_blocks = 0;
sector_t block = 0;
unsigned char *buf;
unsigned char *rec;
unsigned int buf_len;
unsigned int list_length;
s64 ret;
u8 same;
/* Get a buffer */
buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* Do a report zone to get the same field */
ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0);
if (ret)
goto out_free;
same = buf[4] & 0x0f;
if (same > 0) {
rec = &buf[64];
zone_blocks = get_unaligned_be64(&rec[8]);
goto out;
}
/*
* Check the size of all zones: all zones must be of
* equal size, except the last zone which can be smaller
* than other zones.
*/
do {
/* Parse REPORT ZONES header */
list_length = get_unaligned_be32(&buf[0]) + 64;
rec = buf + 64;
buf_len = min(list_length, SD_ZBC_BUF_SIZE);
/* Parse zone descriptors */
while (rec < buf + buf_len) {
u64 this_zone_blocks = get_unaligned_be64(&rec[8]);
if (zone_blocks == 0) {
zone_blocks = this_zone_blocks;
} else if (this_zone_blocks != zone_blocks &&
(block + this_zone_blocks < sdkp->capacity
|| this_zone_blocks > zone_blocks)) {
zone_blocks = 0;
goto out;
}
block += this_zone_blocks;
rec += 64;
}
if (block < sdkp->capacity) {
ret = sd_zbc_report_zones(sdkp, buf,
SD_ZBC_BUF_SIZE, block);
if (ret)
goto out_free;
}
} while (block < sdkp->capacity);
out:
if (!zone_blocks) {
if (sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"Devices with non constant zone "
"size are not supported\n");
ret = -ENODEV;
} else if (!is_power_of_2(zone_blocks)) {
if (sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"Devices with non power of 2 zone "
"size are not supported\n");
ret = -ENODEV;
} else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
if (sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"Zone size too large\n");
ret = -ENODEV;
} else {
ret = zone_blocks;
}
out_free:
kfree(buf);
return ret;
}
/**
* sd_zbc_alloc_zone_bitmap - Allocate a zone bitmap (one bit per zone).
* @nr_zones: Number of zones to allocate space for.
* @numa_node: NUMA node to allocate the memory from.
*/
static inline unsigned long *
sd_zbc_alloc_zone_bitmap(u32 nr_zones, int numa_node)
{
return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
GFP_KERNEL, numa_node);
}
/**
* sd_zbc_get_seq_zones - Parse report zones reply to identify sequential zones
* @sdkp: disk used
* @buf: report reply buffer
* @buflen: length of @buf
* @zone_shift: logarithm base 2 of the number of blocks in a zone
* @seq_zones_bitmap: bitmap of sequential zones to set
*
* Parse reported zone descriptors in @buf to identify sequential zones and
* set the reported zone bit in @seq_zones_bitmap accordingly.
* Since read-only and offline zones cannot be written, do not
* mark them as sequential in the bitmap.
* Return the LBA after the last zone reported.
*/
static sector_t sd_zbc_get_seq_zones(struct scsi_disk *sdkp, unsigned char *buf,
unsigned int buflen, u32 zone_shift,
unsigned long *seq_zones_bitmap)
{
sector_t lba, next_lba = sdkp->capacity;
unsigned int buf_len, list_length;
unsigned char *rec;
u8 type, cond;
list_length = get_unaligned_be32(&buf[0]) + 64;
buf_len = min(list_length, buflen);
rec = buf + 64;
while (rec < buf + buf_len) {
type = rec[0] & 0x0f;
cond = (rec[1] >> 4) & 0xf;
lba = get_unaligned_be64(&rec[16]);
if (type != ZBC_ZONE_TYPE_CONV &&
cond != ZBC_ZONE_COND_READONLY &&
cond != ZBC_ZONE_COND_OFFLINE)
set_bit(lba >> zone_shift, seq_zones_bitmap);
next_lba = lba + get_unaligned_be64(&rec[8]);
rec += 64;
}
return next_lba;
}
/**
* sd_zbc_setup_seq_zones_bitmap - Initialize a seq zone bitmap.
* @sdkp: target disk
* @zone_shift: logarithm base 2 of the number of blocks in a zone
* @nr_zones: number of zones to set up a seq zone bitmap for
*
* Allocate a zone bitmap and initialize it by identifying sequential zones.
*/
static unsigned long *
sd_zbc_setup_seq_zones_bitmap(struct scsi_disk *sdkp, u32 zone_shift,
u32 nr_zones)
{
struct request_queue *q = sdkp->disk->queue;
unsigned long *seq_zones_bitmap;
sector_t lba = 0;
unsigned char *buf;
int ret = -ENOMEM;
seq_zones_bitmap = sd_zbc_alloc_zone_bitmap(nr_zones, q->node);
if (!seq_zones_bitmap)
return ERR_PTR(-ENOMEM);
buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
if (!buf)
goto out;
while (lba < sdkp->capacity) {
ret = sd_zbc_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, lba);
if (ret)
goto out;
lba = sd_zbc_get_seq_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
zone_shift, seq_zones_bitmap);
}
if (lba != sdkp->capacity) {
/* Something went wrong */
ret = -EIO;
}
out:
kfree(buf);
if (ret) {
kfree(seq_zones_bitmap);
return ERR_PTR(ret);
}
return seq_zones_bitmap;
}
static void sd_zbc_cleanup(struct scsi_disk *sdkp)
{
struct request_queue *q = sdkp->disk->queue;
kfree(q->seq_zones_bitmap);
q->seq_zones_bitmap = NULL;
kfree(q->seq_zones_wlock);
q->seq_zones_wlock = NULL;
q->nr_zones = 0;
}
static int sd_zbc_setup(struct scsi_disk *sdkp, u32 zone_blocks)
{
struct request_queue *q = sdkp->disk->queue;
u32 zone_shift = ilog2(zone_blocks);
u32 nr_zones;
int ret;
/* chunk_sectors indicates the zone size */
blk_queue_chunk_sectors(q,
logical_to_sectors(sdkp->device, zone_blocks));
nr_zones = round_up(sdkp->capacity, zone_blocks) >> zone_shift;
/*
* Initialize the device request queue information if the number
* of zones changed.
*/
if (nr_zones != sdkp->nr_zones || nr_zones != q->nr_zones) {
unsigned long *seq_zones_wlock = NULL, *seq_zones_bitmap = NULL;
size_t zone_bitmap_size;
if (nr_zones) {
seq_zones_wlock = sd_zbc_alloc_zone_bitmap(nr_zones,
q->node);
if (!seq_zones_wlock) {
ret = -ENOMEM;
goto err;
}
seq_zones_bitmap = sd_zbc_setup_seq_zones_bitmap(sdkp,
zone_shift, nr_zones);
if (IS_ERR(seq_zones_bitmap)) {
ret = PTR_ERR(seq_zones_bitmap);
kfree(seq_zones_wlock);
goto err;
}
}
zone_bitmap_size = BITS_TO_LONGS(nr_zones) *
sizeof(unsigned long);
blk_mq_freeze_queue(q);
if (q->nr_zones != nr_zones) {
/* READ16/WRITE16 is mandatory for ZBC disks */
sdkp->device->use_16_for_rw = 1;
sdkp->device->use_10_for_rw = 0;
sdkp->zone_blocks = zone_blocks;
sdkp->zone_shift = zone_shift;
sdkp->nr_zones = nr_zones;
q->nr_zones = nr_zones;
swap(q->seq_zones_wlock, seq_zones_wlock);
swap(q->seq_zones_bitmap, seq_zones_bitmap);
} else if (memcmp(q->seq_zones_bitmap, seq_zones_bitmap,
zone_bitmap_size) != 0) {
memcpy(q->seq_zones_bitmap, seq_zones_bitmap,
zone_bitmap_size);
}
blk_mq_unfreeze_queue(q);
kfree(seq_zones_wlock);
kfree(seq_zones_bitmap);
}
return 0;
err:
sd_zbc_cleanup(sdkp);
return ret;
}
int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
{
int64_t zone_blocks;
int ret;
if (!sd_is_zoned(sdkp))
/*
* Device managed or normal SCSI disk,
* no special handling required
*/
return 0;
/* Get zoned block device characteristics */
ret = sd_zbc_read_zoned_characteristics(sdkp, buf);
if (ret)
goto err;
/*
* Check for unconstrained reads: host-managed devices with
* constrained reads (drives failing read after write pointer)
* are not supported.
*/
if (!sdkp->urswrz) {
if (sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"constrained reads devices are not supported\n");
ret = -ENODEV;
goto err;
}
/* Check capacity */
ret = sd_zbc_check_capacity(sdkp, buf);
if (ret)
goto err;
/*
* Check zone size: only devices with a constant zone size (except
* an eventual last runt zone) that is a power of 2 are supported.
*/
zone_blocks = sd_zbc_check_zone_size(sdkp);
ret = -EFBIG;
if (zone_blocks != (u32)zone_blocks)
goto err;
ret = zone_blocks;
if (ret < 0)
goto err;
/* The drive satisfies the kernel restrictions: set it up */
ret = sd_zbc_setup(sdkp, zone_blocks);
if (ret)
goto err;
return 0;
err:
sdkp->capacity = 0;
sd_zbc_cleanup(sdkp);
return ret;
}
void sd_zbc_remove(struct scsi_disk *sdkp)
{
sd_zbc_cleanup(sdkp);
}
void sd_zbc_print_zones(struct scsi_disk *sdkp)
{
if (!sd_is_zoned(sdkp) || !sdkp->capacity)
return;
if (sdkp->capacity & (sdkp->zone_blocks - 1))
sd_printk(KERN_NOTICE, sdkp,
"%u zones of %u logical blocks + 1 runt zone\n",
sdkp->nr_zones - 1,
sdkp->zone_blocks);
else
sd_printk(KERN_NOTICE, sdkp,
"%u zones of %u logical blocks\n",
sdkp->nr_zones,
sdkp->zone_blocks);
}