diff options
Diffstat (limited to 'sys-utils/blkreset.c')
| -rw-r--r-- | sys-utils/blkreset.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/sys-utils/blkreset.c b/sys-utils/blkreset.c new file mode 100644 index 000000000..c32f77ea9 --- /dev/null +++ b/sys-utils/blkreset.c @@ -0,0 +1,190 @@ +/* + * blkreset.c -- Reset the WP on a range of zones. + * + * Copyright (C) 2015,2016 Seagate Technology PLC + * Written by Shaun Tancheff <shaun.tancheff@seagate.com> + * + * Copyright (C) 2017 Karel Zak <kzak@redhat.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * 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. If not, see <http://www.gnu.org/licenses/>. + * + * This program uses BLKREPORT ioctl to query zone information about part of + * or a whole block device, if the device supports it. + * You can specify range (start and length) to be queried. + */ + +#include <string.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <stdint.h> +#include <fcntl.h> +#include <limits.h> +#include <getopt.h> +#include <time.h> +#include <ctype.h> + +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <linux/fs.h> +#include <linux/major.h> +#include <linux/blkzoned.h> + +#include "sysfs.h" +#include "nls.h" +#include "strutils.h" +#include "c.h" +#include "closestream.h" +#include "blkdev.h" + +static unsigned long blkdev_chunk_sectors(const char *dname) +{ + struct sysfs_cxt cxt = UL_SYSFSCXT_EMPTY; + dev_t devno = sysfs_devname_to_devno(dname, NULL); + int major_no = major(devno); + int block_no = minor(devno) & ~0x0f; + uint64_t sz; + + /* + * Mapping /dev/sdXn -> /sys/block/sdX to read the chunk_size entry. + * This method masks off the partition specified by the minor device + * component. + */ + devno = makedev(major_no, block_no); + if (sysfs_init(&cxt, devno, NULL)) + return 0; + + if (sysfs_read_u64(&cxt, "queue/chunk_sectors", &sz) != 0) + warnx(_("%s: failed to read chunk size"), dname); + + sysfs_deinit(&cxt); + return sz; +} + +static void __attribute__((__noreturn__)) usage(FILE *out) +{ + fputs(USAGE_HEADER, out); + fprintf(out, + _(" %s [options] <device>\n"), program_invocation_short_name); + + fputs(USAGE_SEPARATOR, out); + fputs(_("Discard the content of sectors on a device.\n"), out); + + fputs(USAGE_OPTIONS, out); + fputs(_(" -z, --zone <offset> LBA of start of zone to act upon (default = 0)\n" + " -c, --count <length> number of zones to reset (default = 1)"), + out); + fputs(USAGE_SEPARATOR, out); + fputs(USAGE_HELP, out); + fputs(USAGE_VERSION, out); + fprintf(out, USAGE_MAN_TAIL("blkreset(8)")); + exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); +} + + +int main(int argc, char **argv) +{ + char *path; + int c, fd; + uint64_t blksectors = 0; + struct stat sb; + struct blk_zone_range za; + uint64_t zsector = 0; + uint64_t zlen = 0; + uint64_t zcount = 1; + unsigned long zsize; + int rc = 0; + + static const struct option longopts[] = { + { "help", 0, 0, 'h' }, + { "version", 0, 0, 'V' }, + { "zone", 1, 0, 'z' }, + { "count", 1, 0, 'c' }, + { NULL, 0, 0, 0 } + }; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + atexit(close_stdout); + + while ((c = getopt_long(argc, argv, "hVz:c:", longopts, NULL)) != -1) { + switch(c) { + case 'h': + usage(stdout); + break; + case 'c': + zcount = strtosize_or_err(optarg, + _("failed to parse number of zones")); + break; + case 'z': + zsector = strtosize_or_err(optarg, + _("failed to parse zone offset")); + break; + case 'V': + printf(UTIL_LINUX_VERSION); + return EXIT_SUCCESS; + default: + usage(stderr); + break; + } + } + + if (optind == argc) + errx(EXIT_FAILURE, _("no device specified")); + + path = argv[optind++]; + + if (optind != argc) { + warnx(_("unexpected number of arguments")); + usage(stderr); + } + + zsize = blkdev_chunk_sectors(path); + if (zsize == 0) + err(EXIT_FAILURE, _("%s: Unable to determine zone size"), path); + + fd = open(path, O_WRONLY); + if (fd < 0) + err(EXIT_FAILURE, _("cannot open %s"), path); + + if (fstat(fd, &sb) == -1) + err(EXIT_FAILURE, _("stat of %s failed"), path); + if (!S_ISBLK(sb.st_mode)) + errx(EXIT_FAILURE, _("%s: not a block device"), path); + + if (blkdev_get_sectors(fd, (unsigned long long *) &blksectors)) + err(EXIT_FAILURE, _("%s: blkdev_get_sectors ioctl failed"), path); + + /* check offset alignment to the chunk size */ + if (zsector & (zsize - 1)) + errx(EXIT_FAILURE, _("%s: zone %" PRIu64 " is not aligned " + "to zone size %" PRIu64), path, zsector, zsize); + if (zsector > blksectors) + errx(EXIT_FAILURE, _("%s: offset is greater than device size"), path); + + zlen = zcount * zsize; + if (zsector + zlen > blksectors) + zlen = blksectors - zsector; + + za.sector = zsector; + za.nr_sectors = zlen; + rc = ioctl(fd, BLKRESETZONE, &za); + if (rc == -1) + err(EXIT_FAILURE, _("%s: BLKRESETZONE ioctl failed"), path); + + close(fd); + return EXIT_SUCCESS; +} |