[thirdparty/util-linux.git] / sys-utils / fstrim.c

/*
 * fstrim.c -- discard the part (or whole) of mounted filesystem.
 *
 * Copyright (C) 2010 Red Hat, Inc. All rights reserved.
 * Written by Lukas Czerner <lczerner@redhat.com>
 *            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 FITRIM ioctl to discard parts or the whole filesystem
 * online (mounted). You can specify range (start and length) to be
 * discarded, or simply discard whole filesystem.
 */

#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 <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/fs.h>

#include "nls.h"
#include "strutils.h"
#include "c.h"
#include "closestream.h"
#include "pathnames.h"
#include "sysfs.h"

#include <libmount.h>


#ifndef FITRIM
struct fstrim_range {
	uint64_t start;
	uint64_t len;
	uint64_t minlen;
};
#define FITRIM		_IOWR('X', 121, struct fstrim_range)
#endif

struct fstrim_control {
	struct fstrim_range range;

	unsigned int verbose : 1,
		     fstab   : 1,
		     dryrun : 1;
};

/* returns: 0 = success, 1 = unsupported, < 0 = error */
static int fstrim_filesystem(struct fstrim_control *ctl, const char *path, const char *devname)
{
	int fd, rc;
	struct stat sb;
	struct fstrim_range range;

	/* kernel modifies the range */
	memcpy(&range, &ctl->range, sizeof(range));

	fd = open(path, O_RDONLY);
	if (fd < 0) {
		warn(_("cannot open %s"), path);
		rc = -errno;
		goto done;
	}
	if (fstat(fd, &sb) == -1) {
		warn(_("stat of %s failed"), path);
		rc = -errno;
		goto done;
	}
	if (!S_ISDIR(sb.st_mode)) {
		warnx(_("%s: not a directory"), path);
		rc = -EINVAL;
		goto done;
	}

	if (ctl->dryrun) {
		if (devname)
			printf(_("%s: 0 B (dry run) trimmed on %s\n"), path, devname);
		else
			printf(_("%s: 0 B (dry run) trimmed\n"), path);
		rc = 0;
		goto done;
	}

	errno = 0;
	if (ioctl(fd, FITRIM, &range)) {
		rc = errno == EOPNOTSUPP || errno == ENOTTY ? 1 : -errno;

		if (rc != 1)
			warn(_("%s: FITRIM ioctl failed"), path);
		goto done;
	}

	if (ctl->verbose) {
		char *str = size_to_human_string(
				SIZE_SUFFIX_3LETTER | SIZE_SUFFIX_SPACE,
				(uint64_t) range.len);
		if (devname)
			/* TRANSLATORS: The standard value here is a very large number. */
			printf(_("%s: %s (%" PRIu64 " bytes) trimmed on %s\n"),
				path, str, (uint64_t) range.len, devname);
		else
			/* TRANSLATORS: The standard value here is a very large number. */
			printf(_("%s: %s (%" PRIu64 " bytes) trimmed\n"),
				path, str, (uint64_t) range.len);

		free(str);
	}

	rc = 0;
done:
	if (fd >= 0)
		close(fd);
	return rc;
}

static int has_discard(const char *devname, struct path_cxt **wholedisk)
{
	struct path_cxt *pc = NULL;
	uint64_t dg = 0;
	dev_t disk = 0, dev;
	int rc = -1;

	dev = sysfs_devname_to_devno(devname);
	if (!dev)
		goto fail;

	pc = ul_new_sysfs_path(dev, NULL, NULL);
	if (!pc)
		goto fail;

	/*
	 * This is tricky to read the info from sys/, because the queue
	 * attributes are provided for whole devices (disk) only. We're trying
	 * to reuse the whole-disk sysfs context to optimize this stuff (as
	 * system usually have just one disk only).
	 */
	rc = sysfs_blkdev_get_wholedisk(pc, NULL, 0, &disk);
	if (rc != 0 || !disk)
		goto fail;

	if (dev != disk) {
		/* Partition, try reuse whole-disk context if valid for the
		 * current device, otherwise create new context for the
		 * whole-disk.
		 */
		if (*wholedisk && sysfs_blkdev_get_devno(*wholedisk) != disk) {
			ul_unref_path(*wholedisk);
			*wholedisk = NULL;
		}
		if (!*wholedisk) {
			*wholedisk = ul_new_sysfs_path(disk, NULL, NULL);
			if (!*wholedisk)
				goto fail;
		}
		sysfs_blkdev_set_parent(pc, *wholedisk);
	}

	rc = ul_path_read_u64(pc, &dg, "queue/discard_granularity");

	ul_unref_path(pc);
	return rc == 0 && dg > 0;
fail:
	ul_unref_path(pc);
	return 1;
}


static int uniq_fs_target_cmp(
		struct libmnt_table *tb __attribute__((__unused__)),
		struct libmnt_fs *a,
		struct libmnt_fs *b)
{
	return !mnt_fs_streq_target(a, mnt_fs_get_target(b));
}

static int uniq_fs_source_cmp(
		struct libmnt_table *tb __attribute__((__unused__)),
		struct libmnt_fs *a,
		struct libmnt_fs *b)
{
	if (mnt_fs_is_pseudofs(a) || mnt_fs_is_netfs(a) ||
	    mnt_fs_is_pseudofs(b) || mnt_fs_is_netfs(b))
		return 1;

	return !mnt_fs_streq_srcpath(a, mnt_fs_get_srcpath(b));
}

/*
 * fstrim --all follows "mount -a" return codes:
 *
 * 0  = all success
 * 32 = all failed
 * 64 = some failed, some success
 */
static int fstrim_all(struct fstrim_control *ctl)
{
	struct libmnt_fs *fs;
	struct libmnt_iter *itr;
	struct libmnt_table *tab;
	struct libmnt_cache *cache = NULL;
	struct path_cxt *wholedisk = NULL;
	int cnt = 0, cnt_err = 0;
	const char *filename = _PATH_PROC_MOUNTINFO;

	mnt_init_debug(0);
	ul_path_init_debug();

	itr = mnt_new_iter(MNT_ITER_BACKWARD);
	if (!itr)
		err(MNT_EX_FAIL, _("failed to initialize libmount iterator"));

	if (ctl->fstab)
		filename = mnt_get_fstab_path();

	tab = mnt_new_table_from_file(filename);
	if (!tab)
		err(MNT_EX_FAIL, _("failed to parse %s"), filename);

	/* de-duplicate by mountpoints */
	mnt_table_uniq_fs(tab, 0, uniq_fs_target_cmp);

	/* de-duplicate by source */
	mnt_table_uniq_fs(tab, MNT_UNIQ_FORWARD, uniq_fs_source_cmp);

	if (ctl->fstab) {
		cache = mnt_new_cache();
		if (!cache)
			err(MNT_EX_FAIL, _("failed to initialize libmount cache"));
	}

	while (mnt_table_next_fs(tab, itr, &fs) == 0) {
		const char *src = mnt_fs_get_srcpath(fs),
			   *tgt = mnt_fs_get_target(fs);
		char *path;
		int rc = 1;

		if (!tgt || mnt_fs_is_pseudofs(fs) || mnt_fs_is_netfs(fs))
			continue;

		if (!src && cache) {
			/* convert LABEL= (etc.) from fstab to paths */
			const char *spec = mnt_fs_get_source(fs);

			if (!spec)
				continue;
			src = mnt_resolve_spec(spec, cache);
		}

		if (!src || *src != '/')
			continue;

		/* Is it really accessible mountpoint? Not all mountpoints are
		 * accessible (maybe over mounted by another filesystem) */
		path = mnt_get_mountpoint(tgt);
		if (path && strcmp(path, tgt) == 0)
			rc = 0;
		free(path);
		if (rc)
			continue;	/* overlaying mount */

		if (!has_discard(src, &wholedisk))
			continue;
		cnt++;

		/*
		 * We're able to detect that the device supports discard, but
		 * things also depend on filesystem or device mapping, for
		 * example LUKS (by default) does not support FSTRIM.
		 *
		 * This is reason why we ignore EOPNOTSUPP and ENOTTY errors
		 * from discard ioctl.
		 */
		if (fstrim_filesystem(ctl, tgt, src) < 0)
		       cnt_err++;
	}

	ul_unref_path(wholedisk);
	mnt_unref_table(tab);
	mnt_free_iter(itr);
	mnt_unref_cache(cache);

	if (cnt && cnt == cnt_err)
		return MNT_EX_FAIL;		/* all failed */
	if (cnt && cnt_err)
		return MNT_EX_SOMEOK;		/* some ok */

	return MNT_EX_SUCCESS;
}

static void __attribute__((__noreturn__)) usage(void)
{
	FILE *out = stdout;
	fputs(USAGE_HEADER, out);
	fprintf(out,
	      _(" %s [options] <mount point>\n"), program_invocation_short_name);

	fputs(USAGE_SEPARATOR, out);
	fputs(_("Discard unused blocks on a mounted filesystem.\n"), out);

	fputs(USAGE_OPTIONS, out);
	fputs(_(" -a, --all           trim all supported mounted filesystems\n"), out);
	fputs(_(" -A, --fstab         trim all supported mounted filesystems from /etc/fstab\n"), out);
	fputs(_(" -o, --offset <num>  the offset in bytes to start discarding from\n"), out);
	fputs(_(" -l, --length <num>  the number of bytes to discard\n"), out);
	fputs(_(" -m, --minimum <num> the minimum extent length to discard\n"), out);
	fputs(_(" -v, --verbose       print number of discarded bytes\n"), out);
	fputs(_(" -n, --dry-run       does everything, but trim\n"), out);

	fputs(USAGE_SEPARATOR, out);
	printf(USAGE_HELP_OPTIONS(21));
	printf(USAGE_MAN_TAIL("fstrim(8)"));
	exit(EXIT_SUCCESS);
}

int main(int argc, char **argv)
{
	char *path = NULL;
	int c, rc, all = 0;
	struct fstrim_control ctl = {
			.range = { .len = ULLONG_MAX }
	};

	static const struct option longopts[] = {
	    { "all",       no_argument,       NULL, 'a' },
	    { "fstab",     no_argument,       NULL, 'A' },
	    { "help",      no_argument,       NULL, 'h' },
	    { "version",   no_argument,       NULL, 'V' },
	    { "offset",    required_argument, NULL, 'o' },
	    { "length",    required_argument, NULL, 'l' },
	    { "minimum",   required_argument, NULL, 'm' },
	    { "verbose",   no_argument,       NULL, 'v' },
	    { "dry-run",   no_argument,       NULL, 'n' },
	    { NULL, 0, NULL, 0 }
	};

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	atexit(close_stdout);

	while ((c = getopt_long(argc, argv, "Aahl:m:no:Vv", longopts, NULL)) != -1) {
		switch(c) {
		case 'A':
			ctl.fstab = 1;
			/* fallthrough */
		case 'a':
			all = 1;
			break;
		case 'n':
			ctl.dryrun = 1;
			break;
		case 'h':
			usage();
			break;
		case 'V':
			printf(UTIL_LINUX_VERSION);
			return EXIT_SUCCESS;
		case 'l':
			ctl.range.len = strtosize_or_err(optarg,
					_("failed to parse length"));
			break;
		case 'o':
			ctl.range.start = strtosize_or_err(optarg,
					_("failed to parse offset"));
			break;
		case 'm':
			ctl.range.minlen = strtosize_or_err(optarg,
					_("failed to parse minimum extent length"));
			break;
		case 'v':
			ctl.verbose = 1;
			break;
		default:
			errtryhelp(EXIT_FAILURE);
			break;
		}
	}

	if (!all) {
		if (optind == argc)
			errx(EXIT_FAILURE, _("no mountpoint specified"));
		path = argv[optind++];
	}

	if (optind != argc) {
		warnx(_("unexpected number of arguments"));
		errtryhelp(EXIT_FAILURE);
	}

	if (all)
		return fstrim_all(&ctl);	/* MNT_EX_* codes */

	rc = fstrim_filesystem(&ctl, path, NULL);
	if (rc == 1)
		warnx(_("%s: the discard operation is not supported"), path);

	return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
Commit	Line	Data
d9e2d0dd LC	1	/*
	2	* fstrim.c -- discard the part (or whole) of mounted filesystem.
	3	*
fce05e96	4	* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
d9e2d0dd LC	5	* Written by Lukas Czerner <lczerner@redhat.com>
	6	* Karel Zak <kzak@redhat.com>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation, either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*
	21	*
	22	* This program uses FITRIM ioctl to discard parts or the whole filesystem
	23	* online (mounted). You can specify range (start and length) to be
e3d61a45	24	* discarded, or simply discard whole filesystem.
d9e2d0dd	25	*/
fce05e96	26
d9e2d0dd LC	27	#include <string.h>
	28	#include <unistd.h>
	29	#include <stdlib.h>
	30	#include <stdio.h>
	31	#include <stdint.h>
	32	#include <fcntl.h>
	33	#include <limits.h>
	34	#include <getopt.h>
d9e2d0dd LC	35
	36	#include <sys/ioctl.h>
	37	#include <sys/stat.h>
061d1a51	38	#include <linux/fs.h>
a0357292	39
d9e2d0dd LC	40	#include "nls.h"
d9e2d0dd LC	41	#include "strutils.h"
eb76ca98	42	#include "c.h"
efb8854f	43	#include "closestream.h"
36c370cb KZ	44	#include "pathnames.h"
36c370cb KZ	45	#include "sysfs.h"
36c370cb KZ	46
36c370cb KZ	47	#include <libmount.h>
d9e2d0dd	48
43abda66	49
d9e2d0dd LC	50	#ifndef FITRIM
	51	struct fstrim_range {
	52	uint64_t start;
	53	uint64_t len;
	54	uint64_t minlen;
	55	};
fce05e96	56	#define FITRIM _IOWR('X', 121, struct fstrim_range)
d9e2d0dd LC	57	#endif
d9e2d0dd LC	58
72213916 KZ	59	struct fstrim_control {
	60	struct fstrim_range range;
	61
	62	unsigned int verbose : 1,
c5b8909f	63	fstab : 1,
72213916 KZ	64	dryrun : 1;
	65	};
	66
36c370cb	67	/* returns: 0 = success, 1 = unsupported, < 0 = error */
c5b8909f	68	static int fstrim_filesystem(struct fstrim_control ctl, const char path, const char *devname)
36c370cb	69	{
ee24ab6f	70	int fd, rc;
36c370cb KZ	71	struct stat sb;
	72	struct fstrim_range range;
	73
	74	/* kernel modifies the range */
72213916	75	memcpy(&range, &ctl->range, sizeof(range));
36c370cb	76
e612ead9 SK	77	fd = open(path, O_RDONLY);
	78	if (fd < 0) {
	79	warn(_("cannot open %s"), path);
289b1533 KZ	80	rc = -errno;
289b1533 KZ	81	goto done;
e612ead9 SK	82	}
e612ead9 SK	83	if (fstat(fd, &sb) == -1) {
fc14ceba	84	warn(_("stat of %s failed"), path);
289b1533 KZ	85	rc = -errno;
289b1533 KZ	86	goto done;
36c370cb KZ	87	}
	88	if (!S_ISDIR(sb.st_mode)) {
	89	warnx(_("%s: not a directory"), path);
289b1533 KZ	90	rc = -EINVAL;
289b1533 KZ	91	goto done;
36c370cb	92	}
fda0e2cf	93
72213916	94	if (ctl->dryrun) {
c5b8909f KZ	95	if (devname)
	96	printf(_("%s: 0 B (dry run) trimmed on %s\n"), path, devname);
	97	else
	98	printf(_("%s: 0 B (dry run) trimmed\n"), path);
fda0e2cf KZ	99	rc = 0;
	100	goto done;
	101	}
	102
36c370cb KZ	103	errno = 0;
36c370cb KZ	104	if (ioctl(fd, FITRIM, &range)) {
289b1533	105	rc = errno == EOPNOTSUPP \|\| errno == ENOTTY ? 1 : -errno;
36c370cb KZ	106
	107	if (rc != 1)
	108	warn(_("%s: FITRIM ioctl failed"), path);
289b1533	109	goto done;
36c370cb KZ	110	}
36c370cb KZ	111
72213916	112	if (ctl->verbose) {
36c370cb KZ	113	char *str = size_to_human_string(
	114	SIZE_SUFFIX_3LETTER \| SIZE_SUFFIX_SPACE,
	115	(uint64_t) range.len);
c5b8909f KZ	116	if (devname)
	117	/* TRANSLATORS: The standard value here is a very large number. */
	118	printf(_("%s: %s (%" PRIu64 " bytes) trimmed on %s\n"),
	119	path, str, (uint64_t) range.len, devname);
	120	else
	121	/* TRANSLATORS: The standard value here is a very large number. */
	122	printf(_("%s: %s (%" PRIu64 " bytes) trimmed\n"),
36c370cb	123	path, str, (uint64_t) range.len);
c5b8909f	124
36c370cb KZ	125	free(str);
36c370cb KZ	126	}
289b1533 KZ	127
	128	rc = 0;
	129	done:
	130	if (fd >= 0)
	131	close(fd);
	132	return rc;
36c370cb KZ	133	}
36c370cb KZ	134
c69bd2cb	135	static int has_discard(const char devname, struct path_cxt *wholedisk)
36c370cb	136	{
c69bd2cb	137	struct path_cxt *pc = NULL;
36c370cb KZ	138	uint64_t dg = 0;
36c370cb KZ	139	dev_t disk = 0, dev;
c69bd2cb	140	int rc = -1;
36c370cb	141
c69bd2cb	142	dev = sysfs_devname_to_devno(devname);
36c370cb	143	if (!dev)
c69bd2cb KZ	144	goto fail;
	145
	146	pc = ul_new_sysfs_path(dev, NULL, NULL);
	147	if (!pc)
	148	goto fail;
	149
36c370cb KZ	150	/*
36c370cb KZ	151	* This is tricky to read the info from sys/, because the queue
9e930041	152	* attributes are provided for whole devices (disk) only. We're trying
36c370cb	153	* to reuse the whole-disk sysfs context to optimize this stuff (as
0e65dcde	154	* system usually have just one disk only).
36c370cb	155	*/
c69bd2cb KZ	156	rc = sysfs_blkdev_get_wholedisk(pc, NULL, 0, &disk);
	157	if (rc != 0 \|\| !disk)
	158	goto fail;
	159
36c370cb	160	if (dev != disk) {
c69bd2cb KZ	161	/* Partition, try reuse whole-disk context if valid for the
	162	* current device, otherwise create new context for the
	163	* whole-disk.
	164	*/
	165	if (wholedisk && sysfs_blkdev_get_devno(wholedisk) != disk) {
	166	ul_unref_path(*wholedisk);
	167	*wholedisk = NULL;
	168	}
	169	if (!*wholedisk) {
	170	*wholedisk = ul_new_sysfs_path(disk, NULL, NULL);
	171	if (!*wholedisk)
	172	goto fail;
36c370cb	173	}
c69bd2cb	174	sysfs_blkdev_set_parent(pc, *wholedisk);
36c370cb KZ	175	}
36c370cb KZ	176
c69bd2cb	177	rc = ul_path_read_u64(pc, &dg, "queue/discard_granularity");
36c370cb	178
c69bd2cb	179	ul_unref_path(pc);
36c370cb	180	return rc == 0 && dg > 0;
c69bd2cb KZ	181	fail:
	182	ul_unref_path(pc);
	183	return 1;
36c370cb KZ	184	}
36c370cb KZ	185
e05a3400 KZ	186
	187	static int uniq_fs_target_cmp(
	188	struct libmnt_table *tb __attribute__((__unused__)),
	189	struct libmnt_fs *a,
	190	struct libmnt_fs *b)
	191	{
	192	return !mnt_fs_streq_target(a, mnt_fs_get_target(b));
	193	}
	194
8dd51c18 KZ	195	static int uniq_fs_source_cmp(
	196	struct libmnt_table *tb __attribute__((__unused__)),
	197	struct libmnt_fs *a,
	198	struct libmnt_fs *b)
	199	{
8dd51c18 KZ	200	if (mnt_fs_is_pseudofs(a) \|\| mnt_fs_is_netfs(a) \|\|
	201	mnt_fs_is_pseudofs(b) \|\| mnt_fs_is_netfs(b))
	202	return 1;
	203
afa382f2	204	return !mnt_fs_streq_srcpath(a, mnt_fs_get_srcpath(b));
8dd51c18 KZ	205	}
8dd51c18 KZ	206
36c370cb KZ	207	/*
	208	* fstrim --all follows "mount -a" return codes:
	209	*
	210	* 0 = all success
	211	* 32 = all failed
	212	* 64 = some failed, some success
	213	*/
72213916	214	static int fstrim_all(struct fstrim_control *ctl)
36c370cb KZ	215	{
	216	struct libmnt_fs *fs;
	217	struct libmnt_iter *itr;
	218	struct libmnt_table *tab;
c5b8909f	219	struct libmnt_cache *cache = NULL;
c69bd2cb	220	struct path_cxt *wholedisk = NULL;
36c370cb	221	int cnt = 0, cnt_err = 0;
c5b8909f	222	const char *filename = _PATH_PROC_MOUNTINFO;
36c370cb	223
e05a3400	224	mnt_init_debug(0);
fda0e2cf	225	ul_path_init_debug();
e05a3400	226
36c370cb KZ	227	itr = mnt_new_iter(MNT_ITER_BACKWARD);
36c370cb KZ	228	if (!itr)
8e9039af	229	err(MNT_EX_FAIL, _("failed to initialize libmount iterator"));
36c370cb	230
c5b8909f KZ	231	if (ctl->fstab)
	232	filename = mnt_get_fstab_path();
	233
	234	tab = mnt_new_table_from_file(filename);
36c370cb	235	if (!tab)
c5b8909f	236	err(MNT_EX_FAIL, _("failed to parse %s"), filename);
36c370cb	237
8dd51c18	238	/* de-duplicate by mountpoints */
e05a3400 KZ	239	mnt_table_uniq_fs(tab, 0, uniq_fs_target_cmp);
e05a3400 KZ	240
c0b07485	241	/* de-duplicate by source */
155d48f5	242	mnt_table_uniq_fs(tab, MNT_UNIQ_FORWARD, uniq_fs_source_cmp);
8dd51c18	243
c5b8909f KZ	244	if (ctl->fstab) {
	245	cache = mnt_new_cache();
	246	if (!cache)
	247	err(MNT_EX_FAIL, _("failed to initialize libmount cache"));
	248	}
	249
36c370cb KZ	250	while (mnt_table_next_fs(tab, itr, &fs) == 0) {
	251	const char *src = mnt_fs_get_srcpath(fs),
	252	*tgt = mnt_fs_get_target(fs);
	253	char *path;
	254	int rc = 1;
	255
c5b8909f KZ	256	if (!tgt \|\| mnt_fs_is_pseudofs(fs) \|\| mnt_fs_is_netfs(fs))
	257	continue;
	258
	259	if (!src && cache) {
	260	/* convert LABEL= (etc.) from fstab to paths */
	261	const char *spec = mnt_fs_get_source(fs);
	262
	263	if (!spec)
	264	continue;
	265	src = mnt_resolve_spec(spec, cache);
	266	}
	267
	268	if (!src \|\| *src != '/')
36c370cb KZ	269	continue;
	270
	271	/* Is it really accessible mountpoint? Not all mountpoints are
9e930041	272	* accessible (maybe over mounted by another filesystem) */
36c370cb KZ	273	path = mnt_get_mountpoint(tgt);
	274	if (path && strcmp(path, tgt) == 0)
	275	rc = 0;
	276	free(path);
	277	if (rc)
	278	continue; /* overlaying mount */
	279
	280	if (!has_discard(src, &wholedisk))
	281	continue;
	282	cnt++;
	283
	284	/*
	285	* We're able to detect that the device supports discard, but
	286	* things also depend on filesystem or device mapping, for
b9d228cf	287	* example LUKS (by default) does not support FSTRIM.
36c370cb KZ	288	*
	289	* This is reason why we ignore EOPNOTSUPP and ENOTTY errors
	290	* from discard ioctl.
	291	*/
c5b8909f	292	if (fstrim_filesystem(ctl, tgt, src) < 0)
36c370cb KZ	293	cnt_err++;
	294	}
	295
c69bd2cb	296	ul_unref_path(wholedisk);
e05a3400	297	mnt_unref_table(tab);
df1a1ca0	298	mnt_free_iter(itr);
c5b8909f	299	mnt_unref_cache(cache);
36c370cb KZ	300
36c370cb KZ	301	if (cnt && cnt == cnt_err)
8e9039af	302	return MNT_EX_FAIL; /* all failed */
36c370cb	303	if (cnt && cnt_err)
8e9039af	304	return MNT_EX_SOMEOK; /* some ok */
36c370cb	305
7afdbb6f	306	return MNT_EX_SUCCESS;
36c370cb KZ	307	}
36c370cb KZ	308
6e1eda6f	309	static void __attribute__((__noreturn__)) usage(void)
d9e2d0dd	310	{
6e1eda6f	311	FILE *out = stdout;
47a9edbd	312	fputs(USAGE_HEADER, out);
fce05e96 KZ	313	fprintf(out,
fce05e96 KZ	314	_(" %s [options] <mount point>\n"), program_invocation_short_name);
451dbcfa BS	315
	316	fputs(USAGE_SEPARATOR, out);
	317	fputs(_("Discard unused blocks on a mounted filesystem.\n"), out);
	318
fce05e96	319	fputs(USAGE_OPTIONS, out);
c5b8909f KZ	320	fputs(_(" -a, --all trim all supported mounted filesystems\n"), out);
c5b8909f KZ	321	fputs(_(" -A, --fstab trim all supported mounted filesystems from /etc/fstab\n"), out);
d6bbe804 BS	322	fputs(_(" -o, --offset <num> the offset in bytes to start discarding from\n"), out);
	323	fputs(_(" -l, --length <num> the number of bytes to discard\n"), out);
	324	fputs(_(" -m, --minimum <num> the minimum extent length to discard\n"), out);
a60fa93c	325	fputs(_(" -v, --verbose print number of discarded bytes\n"), out);
ae5faf06	326	fputs(_(" -n, --dry-run does everything, but trim\n"), out);
a60fa93c	327
47a9edbd	328	fputs(USAGE_SEPARATOR, out);
f45f3ec3 RM	329	printf(USAGE_HELP_OPTIONS(21));
f45f3ec3 RM	330	printf(USAGE_MAN_TAIL("fstrim(8)"));
6e1eda6f	331	exit(EXIT_SUCCESS);
d9e2d0dd LC	332	}
d9e2d0dd LC	333
c84ed54c KZ	334	int main(int argc, char **argv)
c84ed54c KZ	335	{
b35c3727	336	char *path = NULL;
72213916 KZ	337	int c, rc, all = 0;
	338	struct fstrim_control ctl = {
	339	.range = { .len = ULLONG_MAX }
	340	};
c84ed54c	341
fce05e96	342	static const struct option longopts[] = {
87918040	343	{ "all", no_argument, NULL, 'a' },
c5b8909f	344	{ "fstab", no_argument, NULL, 'A' },
87918040 SK	345	{ "help", no_argument, NULL, 'h' },
	346	{ "version", no_argument, NULL, 'V' },
	347	{ "offset", required_argument, NULL, 'o' },
	348	{ "length", required_argument, NULL, 'l' },
	349	{ "minimum", required_argument, NULL, 'm' },
	350	{ "verbose", no_argument, NULL, 'v' },
26b6525a	351	{ "dry-run", no_argument, NULL, 'n' },
87918040	352	{ NULL, 0, NULL, 0 }
d9e2d0dd LC	353	};
	354
	355	setlocale(LC_ALL, "");
	356	bindtextdomain(PACKAGE, LOCALEDIR);
	357	textdomain(PACKAGE);
efb8854f	358	atexit(close_stdout);
d9e2d0dd	359
26b6525a	360	while ((c = getopt_long(argc, argv, "Aahl:m:no:Vv", longopts, NULL)) != -1) {
d9e2d0dd	361	switch(c) {
c5b8909f KZ	362	case 'A':
	363	ctl.fstab = 1;
	364	/* fallthrough */
36c370cb KZ	365	case 'a':
	366	all = 1;
	367	break;
26b6525a	368	case 'n':
72213916	369	ctl.dryrun = 1;
fda0e2cf	370	break;
d9e2d0dd	371	case 'h':
6e1eda6f	372	usage();
d9e2d0dd	373	break;
47a9edbd SK	374	case 'V':
	375	printf(UTIL_LINUX_VERSION);
	376	return EXIT_SUCCESS;
d9e2d0dd	377	case 'l':
72213916	378	ctl.range.len = strtosize_or_err(optarg,
28c71021	379	_("failed to parse length"));
d9e2d0dd LC	380	break;
d9e2d0dd LC	381	case 'o':
72213916	382	ctl.range.start = strtosize_or_err(optarg,
28c71021	383	_("failed to parse offset"));
d9e2d0dd LC	384	break;
d9e2d0dd LC	385	case 'm':
72213916	386	ctl.range.minlen = strtosize_or_err(optarg,
28c71021	387	_("failed to parse minimum extent length"));
d9e2d0dd LC	388	break;
d9e2d0dd LC	389	case 'v':
72213916	390	ctl.verbose = 1;
d9e2d0dd LC	391	break;
d9e2d0dd LC	392	default:
677ec86c	393	errtryhelp(EXIT_FAILURE);
d9e2d0dd LC	394	break;
d9e2d0dd LC	395	}
fce05e96	396	}
d9e2d0dd	397
36c370cb KZ	398	if (!all) {
	399	if (optind == argc)
	400	errx(EXIT_FAILURE, _("no mountpoint specified"));
	401	path = argv[optind++];
	402	}
d9e2d0dd LC	403
	404	if (optind != argc) {
	405	warnx(_("unexpected number of arguments"));
6e1eda6f	406	errtryhelp(EXIT_FAILURE);
d9e2d0dd LC	407	}
d9e2d0dd LC	408
36c370cb	409	if (all)
72213916	410	return fstrim_all(&ctl); /* MNT_EX_* codes */
36c370cb	411
c5b8909f	412	rc = fstrim_filesystem(&ctl, path, NULL);
7afdbb6f KZ	413	if (rc == 1)
	414	warnx(_("%s: the discard operation is not supported"), path);
	415
	416	return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
d9e2d0dd	417	}