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![Damien Le Moal](/assets/img/avatar_default.png)
Drivers exposing zoned block devices have to initialize and maintain correctness (i.e. revalidate) of the device zone bitmaps attached to the device request queue (seq_zones_bitmap and seq_zones_wlock). To simplify coding this, introduce a generic helper function blk_revalidate_disk_zones() suitable for most (and likely all) cases. This new function always update the seq_zones_bitmap and seq_zones_wlock bitmaps as well as the queue nr_zones field when called for a disk using a request based queue. For a disk using a BIO based queue, only the number of zones is updated since these queues do not have schedulers and so do not need the zone bitmaps. With this change, the zone bitmap initialization code in sd_zbc.c can be replaced with a call to this function in sd_zbc_read_zones(), which is called from the disk revalidate block operation method. A call to blk_revalidate_disk_zones() is also added to the null_blk driver for devices created with the zoned mode enabled. Finally, to ensure that zoned devices created with dm-linear or dm-flakey expose the correct number of zones through sysfs, a call to blk_revalidate_disk_zones() is added to dm_table_set_restrictions(). The zone bitmaps allocated and initialized with blk_revalidate_disk_zones() are freed automatically from __blk_release_queue() using the block internal function blk_queue_free_zone_bitmaps(). Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Christoph Hellwig <hch@lst.de> 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>
504 lines
13 KiB
C
504 lines
13 KiB
C
/*
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* SCSI Zoned Block commands
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*
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* Copyright (C) 2014-2015 SUSE Linux GmbH
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* Written by: Hannes Reinecke <hare@suse.de>
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* Modified by: Damien Le Moal <damien.lemoal@hgst.com>
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* Modified by: Shaun Tancheff <shaun.tancheff@seagate.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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*/
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#include <linux/blkdev.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include "sd.h"
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/**
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* sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
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* @sdkp: The disk the report originated from
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* @buf: Address of the report zone descriptor
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* @zone: the destination zone structure
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*
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* All LBA sized values are converted to 512B sectors unit.
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*/
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static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
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struct blk_zone *zone)
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{
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struct scsi_device *sdp = sdkp->device;
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memset(zone, 0, sizeof(struct blk_zone));
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zone->type = buf[0] & 0x0f;
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zone->cond = (buf[1] >> 4) & 0xf;
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if (buf[1] & 0x01)
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zone->reset = 1;
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if (buf[1] & 0x02)
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zone->non_seq = 1;
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zone->len = logical_to_sectors(sdp, get_unaligned_be64(&buf[8]));
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zone->start = logical_to_sectors(sdp, get_unaligned_be64(&buf[16]));
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zone->wp = logical_to_sectors(sdp, get_unaligned_be64(&buf[24]));
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if (zone->type != ZBC_ZONE_TYPE_CONV &&
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zone->cond == ZBC_ZONE_COND_FULL)
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zone->wp = zone->start + zone->len;
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}
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/**
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* sd_zbc_do_report_zones - Issue a REPORT ZONES scsi command.
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* @sdkp: The target disk
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* @buf: Buffer to use for the reply
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* @buflen: the buffer size
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* @lba: Start LBA of the report
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* @partial: Do partial report
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*
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* For internal use during device validation.
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* Using partial=true can significantly speed up execution of a report zones
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* command because the disk does not have to count all possible report matching
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* zones and will only report the count of zones fitting in the command reply
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* buffer.
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*/
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static int sd_zbc_do_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
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unsigned int buflen, sector_t lba,
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bool partial)
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{
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struct scsi_device *sdp = sdkp->device;
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const int timeout = sdp->request_queue->rq_timeout;
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struct scsi_sense_hdr sshdr;
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unsigned char cmd[16];
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unsigned int rep_len;
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int result;
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memset(cmd, 0, 16);
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cmd[0] = ZBC_IN;
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cmd[1] = ZI_REPORT_ZONES;
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put_unaligned_be64(lba, &cmd[2]);
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put_unaligned_be32(buflen, &cmd[10]);
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if (partial)
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cmd[14] = ZBC_REPORT_ZONE_PARTIAL;
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memset(buf, 0, buflen);
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result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
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buf, buflen, &sshdr,
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timeout, SD_MAX_RETRIES, NULL);
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if (result) {
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sd_printk(KERN_ERR, sdkp,
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"REPORT ZONES lba %llu failed with %d/%d\n",
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(unsigned long long)lba,
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host_byte(result), driver_byte(result));
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return -EIO;
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}
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rep_len = get_unaligned_be32(&buf[0]);
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if (rep_len < 64) {
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sd_printk(KERN_ERR, sdkp,
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"REPORT ZONES report invalid length %u\n",
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rep_len);
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return -EIO;
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}
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return 0;
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}
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/**
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* sd_zbc_report_zones - Disk report zones operation.
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* @disk: The target disk
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* @sector: Start 512B sector of the report
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* @zones: Array of zone descriptors
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* @nr_zones: Number of descriptors in the array
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* @gfp_mask: Memory allocation mask
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*
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* Execute a report zones command on the target disk.
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*/
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int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
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struct blk_zone *zones, unsigned int *nr_zones,
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gfp_t gfp_mask)
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{
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struct scsi_disk *sdkp = scsi_disk(disk);
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unsigned int i, buflen, nrz = *nr_zones;
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unsigned char *buf;
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size_t offset = 0;
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int ret = 0;
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if (!sd_is_zoned(sdkp))
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/* Not a zoned device */
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return -EOPNOTSUPP;
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/*
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* Get a reply buffer for the number of requested zones plus a header.
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* For ATA, buffers must be aligned to 512B.
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*/
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buflen = roundup((nrz + 1) * 64, 512);
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buf = kmalloc(buflen, gfp_mask);
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if (!buf)
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return -ENOMEM;
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ret = sd_zbc_do_report_zones(sdkp, buf, buflen,
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sectors_to_logical(sdkp->device, sector), true);
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if (ret)
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goto out_free_buf;
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nrz = min(nrz, get_unaligned_be32(&buf[0]) / 64);
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for (i = 0; i < nrz; i++) {
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offset += 64;
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sd_zbc_parse_report(sdkp, buf + offset, zones);
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zones++;
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}
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*nr_zones = nrz;
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out_free_buf:
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kfree(buf);
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return ret;
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}
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/**
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* sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
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* @sdkp: The target disk
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*/
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static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
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{
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return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
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}
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/**
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* sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
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* @cmd: the command to setup
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*
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* Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
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*/
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int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
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{
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struct request *rq = cmd->request;
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struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
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sector_t sector = blk_rq_pos(rq);
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sector_t block = sectors_to_logical(sdkp->device, sector);
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if (!sd_is_zoned(sdkp))
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/* Not a zoned device */
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return BLKPREP_KILL;
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if (sdkp->device->changed)
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return BLKPREP_KILL;
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if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
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/* Unaligned request */
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return BLKPREP_KILL;
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cmd->cmd_len = 16;
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memset(cmd->cmnd, 0, cmd->cmd_len);
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cmd->cmnd[0] = ZBC_OUT;
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cmd->cmnd[1] = ZO_RESET_WRITE_POINTER;
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put_unaligned_be64(block, &cmd->cmnd[2]);
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rq->timeout = SD_TIMEOUT;
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cmd->sc_data_direction = DMA_NONE;
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cmd->transfersize = 0;
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cmd->allowed = 0;
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return BLKPREP_OK;
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}
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/**
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* sd_zbc_complete - ZBC command post processing.
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* @cmd: Completed command
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* @good_bytes: Command reply bytes
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* @sshdr: command sense header
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*
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* Called from sd_done(). Process report zones reply and handle reset zone
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* and write commands errors.
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*/
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void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
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struct scsi_sense_hdr *sshdr)
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{
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int result = cmd->result;
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struct request *rq = cmd->request;
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switch (req_op(rq)) {
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case REQ_OP_ZONE_RESET:
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if (result &&
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sshdr->sense_key == ILLEGAL_REQUEST &&
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sshdr->asc == 0x24)
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/*
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* INVALID FIELD IN CDB error: reset of a conventional
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* zone was attempted. Nothing to worry about, so be
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* quiet about the error.
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*/
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rq->rq_flags |= RQF_QUIET;
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break;
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case REQ_OP_WRITE:
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case REQ_OP_WRITE_ZEROES:
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case REQ_OP_WRITE_SAME:
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break;
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}
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}
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/**
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* sd_zbc_check_zoned_characteristics - Check zoned block device characteristics
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* @sdkp: Target disk
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* @buf: Buffer where to store the VPD page data
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*
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* Read VPD page B6, get information and check that reads are unconstrained.
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*/
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static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
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unsigned char *buf)
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{
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if (scsi_get_vpd_page(sdkp->device, 0xb6, buf, 64)) {
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sd_printk(KERN_NOTICE, sdkp,
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"Read zoned characteristics VPD page failed\n");
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return -ENODEV;
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}
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if (sdkp->device->type != TYPE_ZBC) {
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/* Host-aware */
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sdkp->urswrz = 1;
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sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
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sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
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sdkp->zones_max_open = 0;
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} else {
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/* Host-managed */
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sdkp->urswrz = buf[4] & 1;
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sdkp->zones_optimal_open = 0;
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sdkp->zones_optimal_nonseq = 0;
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sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
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}
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/*
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* Check for unconstrained reads: host-managed devices with
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* constrained reads (drives failing read after write pointer)
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* are not supported.
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*/
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if (!sdkp->urswrz) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"constrained reads devices are not supported\n");
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return -ENODEV;
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}
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return 0;
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}
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#define SD_ZBC_BUF_SIZE 131072U
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/**
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* sd_zbc_check_zones - Check the device capacity and zone sizes
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* @sdkp: Target disk
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*
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* Check that the device capacity as reported by READ CAPACITY matches the
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* max_lba value (plus one)of the report zones command reply. Also check that
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* all zones of the device have an equal size, only allowing the last zone of
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* the disk to have a smaller size (runt zone). The zone size must also be a
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* power of two.
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*
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* Returns the zone size in number of blocks upon success or an error code
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* upon failure.
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*/
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static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks)
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{
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u64 zone_blocks = 0;
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sector_t max_lba, block = 0;
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unsigned char *buf;
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unsigned char *rec;
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unsigned int buf_len;
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unsigned int list_length;
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int ret;
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u8 same;
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/* Get a buffer */
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buf = kmalloc(SD_ZBC_BUF_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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/* Do a report zone to get max_lba and the same field */
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ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE, 0, false);
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if (ret)
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goto out_free;
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if (sdkp->rc_basis == 0) {
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/* The max_lba field is the capacity of this device */
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max_lba = get_unaligned_be64(&buf[8]);
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if (sdkp->capacity != max_lba + 1) {
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if (sdkp->first_scan)
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sd_printk(KERN_WARNING, sdkp,
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"Changing capacity from %llu to max LBA+1 %llu\n",
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(unsigned long long)sdkp->capacity,
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(unsigned long long)max_lba + 1);
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sdkp->capacity = max_lba + 1;
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}
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}
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/*
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* Check same field: for any value other than 0, we know that all zones
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* have the same size.
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*/
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same = buf[4] & 0x0f;
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if (same > 0) {
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rec = &buf[64];
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zone_blocks = get_unaligned_be64(&rec[8]);
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goto out;
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}
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/*
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* Check the size of all zones: all zones must be of
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* equal size, except the last zone which can be smaller
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* than other zones.
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*/
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do {
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/* Parse REPORT ZONES header */
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list_length = get_unaligned_be32(&buf[0]) + 64;
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rec = buf + 64;
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buf_len = min(list_length, SD_ZBC_BUF_SIZE);
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/* Parse zone descriptors */
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while (rec < buf + buf_len) {
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u64 this_zone_blocks = get_unaligned_be64(&rec[8]);
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if (zone_blocks == 0) {
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zone_blocks = this_zone_blocks;
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} else if (this_zone_blocks != zone_blocks &&
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(block + this_zone_blocks < sdkp->capacity
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|| this_zone_blocks > zone_blocks)) {
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zone_blocks = 0;
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goto out;
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}
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block += this_zone_blocks;
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rec += 64;
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}
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if (block < sdkp->capacity) {
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ret = sd_zbc_do_report_zones(sdkp, buf, SD_ZBC_BUF_SIZE,
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block, true);
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if (ret)
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goto out_free;
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}
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} while (block < sdkp->capacity);
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out:
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if (!zone_blocks) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"Devices with non constant zone "
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"size are not supported\n");
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ret = -ENODEV;
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} else if (!is_power_of_2(zone_blocks)) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"Devices with non power of 2 zone "
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"size are not supported\n");
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ret = -ENODEV;
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} else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {
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if (sdkp->first_scan)
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sd_printk(KERN_NOTICE, sdkp,
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"Zone size too large\n");
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ret = -EFBIG;
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} else {
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*zblocks = zone_blocks;
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ret = 0;
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}
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out_free:
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kfree(buf);
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return ret;
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}
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int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
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{
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struct gendisk *disk = sdkp->disk;
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unsigned int nr_zones;
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u32 zone_blocks;
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int ret;
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if (!sd_is_zoned(sdkp))
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/*
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* Device managed or normal SCSI disk,
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* no special handling required
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*/
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return 0;
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/* Check zoned block device characteristics (unconstrained reads) */
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ret = sd_zbc_check_zoned_characteristics(sdkp, buf);
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if (ret)
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goto err;
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/*
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* Check zone size: only devices with a constant zone size (except
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* an eventual last runt zone) that is a power of 2 are supported.
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*/
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ret = sd_zbc_check_zones(sdkp, &zone_blocks);
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if (ret != 0)
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goto err;
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/* The drive satisfies the kernel restrictions: set it up */
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blk_queue_chunk_sectors(sdkp->disk->queue,
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logical_to_sectors(sdkp->device, zone_blocks));
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nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
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/* READ16/WRITE16 is mandatory for ZBC disks */
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sdkp->device->use_16_for_rw = 1;
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sdkp->device->use_10_for_rw = 0;
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/*
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* If something changed, revalidate the disk zone bitmaps once we have
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* the capacity, that is on the second revalidate execution during disk
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* scan and always during normal revalidate.
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*/
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if (sdkp->first_scan)
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return 0;
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if (sdkp->zone_blocks != zone_blocks ||
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sdkp->nr_zones != nr_zones ||
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disk->queue->nr_zones != nr_zones) {
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ret = blk_revalidate_disk_zones(disk);
|
|
if (ret != 0)
|
|
goto err;
|
|
sdkp->zone_blocks = zone_blocks;
|
|
sdkp->nr_zones = nr_zones;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
sdkp->capacity = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
}
|