351 lines
8.8 KiB
C
351 lines
8.8 KiB
C
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/*
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* blkzone.c -- the block device zone commands
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*
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* Copyright (C) 2015,2016 Seagate Technology PLC
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* Written by Shaun Tancheff <shaun.tancheff@seagate.com>
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*
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* Copyright (C) 2017 Karel Zak <kzak@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <getopt.h>
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#include <time.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <linux/fs.h>
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#include <linux/blkzoned.h>
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#include "nls.h"
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#include "strutils.h"
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#include "xalloc.h"
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#include "c.h"
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#include "closestream.h"
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#include "blkdev.h"
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#include "sysfs.h"
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struct blkzone_control;
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static int blkzone_report(struct blkzone_control *ctl);
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static int blkzone_reset(struct blkzone_control *ctl);
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struct blkzone_command {
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const char *name;
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int (*handler)(struct blkzone_control *);
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const char *help;
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};
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struct blkzone_control {
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const char *devname;
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const struct blkzone_command *command;
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uint64_t total_sectors;
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int secsize;
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uint64_t offset;
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uint64_t length;
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unsigned int verbose : 1;
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};
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static const struct blkzone_command commands[] = {
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{ "report", blkzone_report, N_("Report zone information about the given device") },
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{ "reset", blkzone_reset, N_("Reset a range of zones.") }
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};
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static const struct blkzone_command *name_to_command(const char *name)
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{
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size_t i;
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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if (strcmp(commands[i].name, name) == 0)
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return &commands[i];
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}
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return NULL;
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}
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static int init_device(struct blkzone_control *ctl, int mode)
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{
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struct stat sb;
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int fd;
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fd = open(ctl->devname, mode);
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if (fd < 0)
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err(EXIT_FAILURE, _("cannot open %s"), ctl->devname);
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if (fstat(fd, &sb) == -1)
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err(EXIT_FAILURE, _("stat of %s failed"), ctl->devname);
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if (!S_ISBLK(sb.st_mode))
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errx(EXIT_FAILURE, _("%s: not a block device"), ctl->devname);
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if (blkdev_get_sectors(fd, (unsigned long long *) &ctl->total_sectors))
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err(EXIT_FAILURE, _("%s: blkdev_get_sectors ioctl failed"), ctl->devname);
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if (blkdev_get_sector_size(fd, &ctl->secsize))
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err(EXIT_FAILURE, _("%s: BLKSSZGET ioctl failed"), ctl->devname);
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return fd;
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}
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/*
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* blkzone report
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*/
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#define DEF_REPORT_LEN (1 << 12) /* 4k zones (256k kzalloc) */
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#define MAX_REPORT_LEN (1 << 16) /* 64k zones */
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static const char *type_text[] = {
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"RESERVED",
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"CONVENTIONAL",
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"SEQ_WRITE_REQUIRED",
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"SEQ_WRITE_PREFERRED",
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};
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static const char *condition_str[] = {
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"cv", /* conventional zone */
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"e0", /* empty */
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"Oi", /* open implicit */
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"Oe", /* open explicit */
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"Cl", /* closed */
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"x5", "x6", "x7", "x8", "x9", "xA", "xB", /* xN: reserved */
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"ro", /* read only */
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"fu", /* full */
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"OL" /* offline */
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};
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static int blkzone_report(struct blkzone_control *ctl)
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{
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struct blk_zone_report *zi;
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uint32_t i;
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int fd;
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fd = init_device(ctl, O_RDONLY);
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if (ctl->offset > ctl->total_sectors)
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errx(EXIT_FAILURE, _("%s: offset is greater than device size"), ctl->devname);
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if (ctl->length < 1)
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ctl->length = 1;
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if (ctl->length > MAX_REPORT_LEN) {
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ctl->length = MAX_REPORT_LEN;
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warnx(_("limiting report to %" PRIu64 " entries"), ctl->length);
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}
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zi = xmalloc(sizeof(struct blk_zone_report)
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+ (ctl->length * sizeof(struct blk_zone)));
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zi->nr_zones = ctl->length;
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zi->sector = ctl->offset; /* maybe shift 4Kn -> 512e */
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if (ioctl(fd, BLKREPORTZONE, zi) == -1)
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err(EXIT_FAILURE, _("%s: BLKREPORTZONE ioctl failed"), ctl->devname);
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if (ctl->verbose)
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printf(_("Found %d zones\n"), zi->nr_zones);
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printf(_("Zones returned: %u\n"), zi->nr_zones);
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for (i = 0; i < zi->nr_zones; i++) {
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const struct blk_zone *entry = &zi->zones[i];
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unsigned int type = entry->type;
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uint64_t start = entry->start;
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uint64_t wp = entry->wp;
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uint8_t cond = entry->cond;
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uint64_t len = entry->len;
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if (!len)
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break;
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printf(_(" start: %9lx, len %6lx, wptr %6lx"
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" reset:%u non-seq:%u, zcond:%2u(%s) [type: %u(%s)]\n"),
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start, len, wp - start,
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entry->reset, entry->non_seq,
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cond, condition_str[cond & ARRAY_SIZE(condition_str)],
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type, type_text[type]);
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}
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free(zi);
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close(fd);
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return 0;
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}
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/*
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* blkzone reset
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*/
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static unsigned long blkdev_chunk_sectors(const char *dname)
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{
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struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY;
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dev_t devno = sysfs_devname_to_devno(dname, NULL);
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int major_no = major(devno);
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int block_no = minor(devno) & ~0x0f;
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uint64_t sz;
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int rc;
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/*
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* Mapping /dev/sdXn -> /sys/block/sdX to read the chunk_size entry.
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* This method masks off the partition specified by the minor device
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* component.
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*/
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devno = makedev(major_no, block_no);
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if (sysfs_init(&cxt, devno, NULL))
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return 0;
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rc = sysfs_read_u64(&cxt, "queue/chunk_sectors", &sz);
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sysfs_deinit(&cxt);
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return rc == 0 ? sz : 0;
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}
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static int blkzone_reset(struct blkzone_control *ctl)
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{
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struct blk_zone_range za = { .sector = 0 };
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unsigned long zonesize;
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uint64_t zlen;
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int fd;
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zonesize = blkdev_chunk_sectors(ctl->devname);
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if (!zonesize)
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errx(EXIT_FAILURE, _("%s: unable to determine zone size"), ctl->devname);
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fd = init_device(ctl, O_WRONLY);
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if (ctl->offset & (zonesize - 1))
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errx(EXIT_FAILURE, _("%s: zone %" PRIu64 " is not aligned "
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"to zone size %" PRIu64),
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ctl->devname, ctl->offset, zonesize);
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if (ctl->offset > ctl->total_sectors)
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errx(EXIT_FAILURE, _("%s: offset is greater than device size"), ctl->devname);
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zlen = ctl->length * zonesize;
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if (ctl->offset + zlen > ctl->total_sectors)
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zlen = ctl->total_sectors - ctl->length;
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za.sector = ctl->offset;
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za.nr_sectors = zlen;
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if (ioctl(fd, BLKRESETZONE, &za) == -1)
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err(EXIT_FAILURE, _("%s: BLKRESETZONE ioctl failed"), ctl->devname);
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else if (ctl->verbose)
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printf(_("%s: successfully reset in range from %" PRIu64 ", to %" PRIu64),
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ctl->devname,
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ctl->offset,
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zlen);
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close(fd);
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return 0;
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}
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static void __attribute__((__noreturn__)) usage(FILE *out)
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{
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size_t i;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s <command> [options] <device>\n"), program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Run zone command on the given block device.\n"), out);
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fputs(_("\nCommands:\n"), out);
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for (i = 0; i < ARRAY_SIZE(commands); i++)
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fprintf(out, " %-11s %s\n", commands[i].name, _(commands[i].help));
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fputs(USAGE_OPTIONS, out);
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fputs(_(" -o, --offset <sector> start sector of zone to act (in 512-byte sectors)\n"), out);
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fputs(_(" -l, --length <number> maximum number of zones\n"), out);
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fputs(_(" -v, --verbose display more details\n"), out);
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fputs(USAGE_SEPARATOR, out);
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fputs(USAGE_HELP, out);
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fputs(USAGE_VERSION, out);
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fprintf(out, USAGE_MAN_TAIL("blkzone(8)"));
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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int main(int argc, char **argv)
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{
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int c;
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struct blkzone_control ctl = { .devname = NULL };
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static const struct option longopts[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "length", required_argument, NULL, 'l' }, /* max #of zones (entries) for result */
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{ "offset", required_argument, NULL, 'o' }, /* starting LBA */
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{ "verbose", no_argument, NULL, 'v' },
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{ "version", no_argument, NULL, 'V' },
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{ NULL, 0, NULL, 0 }
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};
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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if (argc >= 2 && *argv[1] != '-') {
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ctl.command = name_to_command(argv[1]);
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if (!ctl.command)
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errx(EXIT_FAILURE, _("%s is not valid command name"), argv[1]);
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argv++;
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argc--;
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}
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while ((c = getopt_long(argc, argv, "hl:o:vV", longopts, NULL)) != -1) {
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switch (c) {
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case 'h':
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usage(stdout);
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break;
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case 'l':
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ctl.length = strtosize_or_err(optarg,
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_("failed to parse number of zones"));
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break;
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case 'o':
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ctl.offset = strtosize_or_err(optarg,
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_("failed to parse zone offset"));
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break;
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case 'v':
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ctl.verbose = 1;
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break;
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case 'V':
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printf(UTIL_LINUX_VERSION);
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return EXIT_SUCCESS;
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default:
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errtryhelp(EXIT_FAILURE);
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}
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}
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if (!ctl.command)
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errx(EXIT_FAILURE, _("no command specified"));
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if (optind == argc)
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errx(EXIT_FAILURE, _("no device specified"));
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ctl.devname = argv[optind++];
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if (optind != argc)
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errx(EXIT_FAILURE,_("unexpected number of arguments"));
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if (ctl.command->handler(&ctl) < 0)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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