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-rw-r--r--sys-utils/swapon.c1017
1 files changed, 1017 insertions, 0 deletions
diff --git a/sys-utils/swapon.c b/sys-utils/swapon.c
new file mode 100644
index 0000000..357dcb3
--- /dev/null
+++ b/sys-utils/swapon.c
@@ -0,0 +1,1017 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include <libsmartcols.h>
+
+#include "c.h"
+#include "nls.h"
+#include "bitops.h"
+#include "blkdev.h"
+#include "pathnames.h"
+#include "xalloc.h"
+#include "strutils.h"
+#include "optutils.h"
+#include "closestream.h"
+
+#include "swapheader.h"
+#include "swapprober.h"
+#include "swapon-common.h"
+
+#ifdef HAVE_SYS_SWAP_H
+# include <sys/swap.h>
+#endif
+
+#ifndef SWAP_FLAG_DISCARD
+# define SWAP_FLAG_DISCARD 0x10000 /* enable discard for swap */
+#endif
+
+#ifndef SWAP_FLAG_DISCARD_ONCE
+# define SWAP_FLAG_DISCARD_ONCE 0x20000 /* discard swap area at swapon-time */
+#endif
+
+#ifndef SWAP_FLAG_DISCARD_PAGES
+# define SWAP_FLAG_DISCARD_PAGES 0x40000 /* discard page-clusters after use */
+#endif
+
+#define SWAP_FLAGS_DISCARD_VALID (SWAP_FLAG_DISCARD | SWAP_FLAG_DISCARD_ONCE | \
+ SWAP_FLAG_DISCARD_PAGES)
+
+#ifndef SWAP_FLAG_PREFER
+# define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */
+#endif
+
+#ifndef SWAP_FLAG_PRIO_MASK
+# define SWAP_FLAG_PRIO_MASK 0x7fff
+#endif
+
+#ifndef SWAP_FLAG_PRIO_SHIFT
+# define SWAP_FLAG_PRIO_SHIFT 0
+#endif
+
+#if !defined(HAVE_SWAPON) && defined(SYS_swapon)
+# include <sys/syscall.h>
+# define swapon(path, flags) syscall(SYS_swapon, path, flags)
+#endif
+
+#define MAX_PAGESIZE (64 * 1024)
+
+#ifndef UUID_STR_LEN
+# define UUID_STR_LEN 37
+#endif
+
+enum {
+ SIG_SWAPSPACE = 1,
+ SIG_SWSUSPEND
+};
+
+/* column names */
+struct colinfo {
+ const char *name; /* header */
+ double whint; /* width hint (N < 1 is in percent of termwidth) */
+ int flags; /* SCOLS_FL_* */
+ const char *help;
+};
+
+enum {
+ COL_PATH,
+ COL_TYPE,
+ COL_SIZE,
+ COL_USED,
+ COL_PRIO,
+ COL_UUID,
+ COL_LABEL
+};
+static struct colinfo infos[] = {
+ [COL_PATH] = { "NAME", 0.20, 0, N_("device file or partition path") },
+ [COL_TYPE] = { "TYPE", 0.20, SCOLS_FL_TRUNC, N_("type of the device")},
+ [COL_SIZE] = { "SIZE", 0.20, SCOLS_FL_RIGHT, N_("size of the swap area")},
+ [COL_USED] = { "USED", 0.20, SCOLS_FL_RIGHT, N_("bytes in use")},
+ [COL_PRIO] = { "PRIO", 0.20, SCOLS_FL_RIGHT, N_("swap priority")},
+ [COL_UUID] = { "UUID", 0.20, 0, N_("swap uuid")},
+ [COL_LABEL] = { "LABEL", 0.20, 0, N_("swap label")},
+};
+
+
+/* swap area properties */
+struct swap_prop {
+ int discard; /* discard policy */
+ int priority; /* non-prioritized swap by default */
+ int no_fail; /* skip device if not exist */
+};
+
+/* device description */
+struct swap_device {
+ const char *path; /* device or file to be turned on */
+ const char *label; /* swap label */
+ const char *uuid; /* unique identifier */
+ unsigned int pagesize;
+};
+
+/* control struct */
+struct swapon_ctl {
+ int columns[ARRAY_SIZE(infos) * 2]; /* --show columns */
+ int ncolumns; /* number of columns */
+
+ struct swap_prop props; /* global settings for all devices */
+
+ unsigned int
+ all:1, /* turn on all swap devices */
+ bytes:1, /* display --show in bytes */
+ fix_page_size:1, /* reinitialize page size */
+ no_heading:1, /* toggle --show headers */
+ raw:1, /* toggle --show alignment */
+ show:1, /* display --show information */
+ verbose:1; /* be chatty */
+};
+
+static int column_name_to_id(const char *name, size_t namesz)
+{
+ size_t i;
+
+ assert(name);
+
+ for (i = 0; i < ARRAY_SIZE(infos); i++) {
+ const char *cn = infos[i].name;
+
+ if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
+ return i;
+ }
+ warnx(_("unknown column: %s"), name);
+ return -1;
+}
+
+static inline int get_column_id(const struct swapon_ctl *ctl, int num)
+{
+ assert(num < ctl->ncolumns);
+ assert(ctl->columns[num] < (int) ARRAY_SIZE(infos));
+
+ return ctl->columns[num];
+}
+
+static inline struct colinfo *get_column_info(const struct swapon_ctl *ctl, unsigned num)
+{
+ return &infos[get_column_id(ctl, num)];
+}
+
+static void add_scols_line(const struct swapon_ctl *ctl, struct libscols_table *table, struct libmnt_fs *fs)
+{
+ int i;
+ struct libscols_line *line;
+ blkid_probe pr = NULL;
+ const char *data;
+
+ assert(table);
+ assert(fs);
+
+ line = scols_table_new_line(table, NULL);
+ if (!line)
+ err(EXIT_FAILURE, _("failed to allocate output line"));
+
+ data = mnt_fs_get_source(fs);
+ if (access(data, R_OK) == 0)
+ pr = get_swap_prober(data);
+ for (i = 0; i < ctl->ncolumns; i++) {
+ char *str = NULL;
+ off_t size;
+
+ switch (get_column_id(ctl, i)) {
+ case COL_PATH:
+ xasprintf(&str, "%s", mnt_fs_get_source(fs));
+ break;
+ case COL_TYPE:
+ xasprintf(&str, "%s", mnt_fs_get_swaptype(fs));
+ break;
+ case COL_SIZE:
+ size = mnt_fs_get_size(fs);
+ size *= 1024; /* convert to bytes */
+ if (ctl->bytes)
+ xasprintf(&str, "%jd", size);
+ else
+ str = size_to_human_string(SIZE_SUFFIX_1LETTER, size);
+ break;
+ case COL_USED:
+ size = mnt_fs_get_usedsize(fs);
+ size *= 1024; /* convert to bytes */
+ if (ctl->bytes)
+ xasprintf(&str, "%jd", size);
+ else
+ str = size_to_human_string(SIZE_SUFFIX_1LETTER, size);
+ break;
+ case COL_PRIO:
+ xasprintf(&str, "%d", mnt_fs_get_priority(fs));
+ break;
+ case COL_UUID:
+ if (pr && !blkid_probe_lookup_value(pr, "UUID", &data, NULL))
+ xasprintf(&str, "%s", data);
+ break;
+ case COL_LABEL:
+ if (pr && !blkid_probe_lookup_value(pr, "LABEL", &data, NULL))
+ xasprintf(&str, "%s", data);
+ break;
+ default:
+ break;
+ }
+
+ if (str && scols_line_refer_data(line, i, str))
+ err(EXIT_FAILURE, _("failed to add output data"));
+ }
+ if (pr)
+ blkid_free_probe(pr);
+ return;
+}
+
+static int display_summary(void)
+{
+ struct libmnt_table *st = get_swaps();
+ struct libmnt_iter *itr;
+ struct libmnt_fs *fs;
+
+ if (!st)
+ return -1;
+
+ if (mnt_table_is_empty(st))
+ return 0;
+
+ itr = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!itr)
+ err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
+
+ printf(_("%s\t\t\t\tType\t\tSize\tUsed\tPriority\n"), _("Filename"));
+
+ while (mnt_table_next_fs(st, itr, &fs) == 0) {
+ printf("%-39s\t%-8s\t%jd\t%jd\t%d\n",
+ mnt_fs_get_source(fs),
+ mnt_fs_get_swaptype(fs),
+ mnt_fs_get_size(fs),
+ mnt_fs_get_usedsize(fs),
+ mnt_fs_get_priority(fs));
+ }
+
+ mnt_free_iter(itr);
+ return 0;
+}
+
+static int show_table(struct swapon_ctl *ctl)
+{
+ struct libmnt_table *st = get_swaps();
+ struct libmnt_iter *itr = NULL;
+ struct libmnt_fs *fs;
+ int i;
+ struct libscols_table *table = NULL;
+
+ if (!st)
+ return -1;
+
+ itr = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!itr)
+ err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
+
+ scols_init_debug(0);
+
+ table = scols_new_table();
+ if (!table)
+ err(EXIT_FAILURE, _("failed to allocate output table"));
+
+ scols_table_enable_raw(table, ctl->raw);
+ scols_table_enable_noheadings(table, ctl->no_heading);
+
+ for (i = 0; i < ctl->ncolumns; i++) {
+ struct colinfo *col = get_column_info(ctl, i);
+
+ if (!scols_table_new_column(table, col->name, col->whint, col->flags))
+ err(EXIT_FAILURE, _("failed to allocate output column"));
+ }
+
+ while (mnt_table_next_fs(st, itr, &fs) == 0)
+ add_scols_line(ctl, table, fs);
+
+ scols_print_table(table);
+ scols_unref_table(table);
+ mnt_free_iter(itr);
+ return 0;
+}
+
+/* calls mkswap */
+static int swap_reinitialize(struct swap_device *dev)
+{
+ pid_t pid;
+ int status, ret;
+ char const *cmd[7];
+ int idx=0;
+
+ assert(dev);
+ assert(dev->path);
+
+ warnx(_("%s: reinitializing the swap."), dev->path);
+
+ switch ((pid=fork())) {
+ case -1: /* fork error */
+ warn(_("fork failed"));
+ return -1;
+
+ case 0: /* child */
+ if (geteuid() != getuid()) {
+ /* in case someone uses swapon as setuid binary */
+ if (setgid(getgid()) < 0)
+ exit(EXIT_FAILURE);
+ if (setuid(getuid()) < 0)
+ exit(EXIT_FAILURE);
+ }
+
+ cmd[idx++] = "mkswap";
+ if (dev->label) {
+ cmd[idx++] = "-L";
+ cmd[idx++] = dev->label;
+ }
+ if (dev->uuid) {
+ cmd[idx++] = "-U";
+ cmd[idx++] = dev->uuid;
+ }
+ cmd[idx++] = dev->path;
+ cmd[idx++] = NULL;
+ execvp(cmd[0], (char * const *) cmd);
+ errexec(cmd[0]);
+
+ default: /* parent */
+ do {
+ ret = waitpid(pid, &status, 0);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret < 0) {
+ warn(_("waitpid failed"));
+ return -1;
+ }
+
+ /* mkswap returns: 0=suss, >0 error */
+ if (WIFEXITED(status) && WEXITSTATUS(status)==0)
+ return 0; /* ok */
+ break;
+ }
+ return -1; /* error */
+}
+
+/* Replaces unwanted SWSUSPEND signature with swap signature */
+static int swap_rewrite_signature(const struct swap_device *dev)
+{
+ int fd, rc = -1;
+
+ assert(dev);
+ assert(dev->path);
+ assert(dev->pagesize);
+
+ fd = open(dev->path, O_WRONLY);
+ if (fd == -1) {
+ warn(_("cannot open %s"), dev->path);
+ return -1;
+ }
+
+ if (lseek(fd, dev->pagesize - SWAP_SIGNATURE_SZ, SEEK_SET) < 0) {
+ warn(_("%s: lseek failed"), dev->path);
+ goto err;
+ }
+
+ if (write(fd, (void *) SWAP_SIGNATURE,
+ SWAP_SIGNATURE_SZ) != SWAP_SIGNATURE_SZ) {
+ warn(_("%s: write signature failed"), dev->path);
+ goto err;
+ }
+
+ rc = 0;
+err:
+ if (close_fd(fd) != 0) {
+ warn(_("write failed: %s"), dev->path);
+ rc = -1;
+ }
+ return rc;
+}
+
+static int swap_detect_signature(const char *buf, int *sig)
+{
+ assert(buf);
+ assert(sig);
+
+ if (memcmp(buf, SWAP_SIGNATURE, SWAP_SIGNATURE_SZ) == 0)
+ *sig = SIG_SWAPSPACE;
+
+ else if (memcmp(buf, "S1SUSPEND", 9) == 0 ||
+ memcmp(buf, "S2SUSPEND", 9) == 0 ||
+ memcmp(buf, "ULSUSPEND", 9) == 0 ||
+ memcmp(buf, "\xed\xc3\x02\xe9\x98\x56\xe5\x0c", 8) == 0 ||
+ memcmp(buf, "LINHIB0001", 10) == 0)
+ *sig = SIG_SWSUSPEND;
+ else
+ return 0;
+
+ return 1;
+}
+
+static char *swap_get_header(int fd, int *sig, unsigned int *pagesize)
+{
+ char *buf;
+ ssize_t datasz;
+ unsigned int page;
+
+ assert(sig);
+ assert(pagesize);
+
+ *pagesize = 0;
+ *sig = 0;
+
+ buf = xmalloc(MAX_PAGESIZE);
+
+ datasz = read(fd, buf, MAX_PAGESIZE);
+ if (datasz == (ssize_t) -1)
+ goto err;
+
+ for (page = 0x1000; page <= MAX_PAGESIZE; page <<= 1) {
+ /* skip 32k pagesize since this does not seem to
+ * be supported */
+ if (page == 0x8000)
+ continue;
+ /* the smallest swap area is PAGE_SIZE*10, it means
+ * 40k, that's less than MAX_PAGESIZE */
+ if (datasz < 0 || (size_t) datasz < (page - SWAP_SIGNATURE_SZ))
+ break;
+ if (swap_detect_signature(buf + page - SWAP_SIGNATURE_SZ, sig)) {
+ *pagesize = page;
+ break;
+ }
+ }
+
+ if (*pagesize)
+ return buf;
+err:
+ free(buf);
+ return NULL;
+}
+
+/* returns real size of swap space */
+static unsigned long long swap_get_size(const struct swap_device *dev,
+ const char *hdr)
+{
+ unsigned int last_page = 0;
+ const unsigned int swap_version = SWAP_VERSION;
+ const struct swap_header_v1_2 *s;
+
+ assert(dev);
+ assert(dev->pagesize > 0);
+
+ s = (const struct swap_header_v1_2 *) hdr;
+
+ if (s->version == swap_version)
+ last_page = s->last_page;
+ else if (swab32(s->version) == swap_version)
+ last_page = swab32(s->last_page);
+
+ return ((unsigned long long) last_page + 1) * dev->pagesize;
+}
+
+static void swap_get_info(struct swap_device *dev, const char *hdr)
+{
+ const struct swap_header_v1_2 *s = (const struct swap_header_v1_2 *) hdr;
+
+ assert(dev);
+
+ if (s && *s->volume_name)
+ dev->label = xstrdup(s->volume_name);
+
+ if (s && *s->uuid) {
+ const unsigned char *u = s->uuid;
+ char str[UUID_STR_LEN];
+
+ snprintf(str, sizeof(str),
+ "%02x%02x%02x%02x-"
+ "%02x%02x-%02x%02x-"
+ "%02x%02x-%02x%02x%02x%02x%02x%02x",
+ u[0], u[1], u[2], u[3],
+ u[4], u[5], u[6], u[7],
+ u[8], u[9], u[10], u[11], u[12], u[13], u[14], u[15]);
+ dev->uuid = xstrdup(str);
+ }
+}
+
+static int swapon_checks(const struct swapon_ctl *ctl, struct swap_device *dev)
+{
+ struct stat st;
+ int fd, sig;
+ char *hdr = NULL;
+ unsigned long long devsize = 0;
+ int permMask;
+
+ assert(ctl);
+ assert(dev);
+ assert(dev->path);
+
+ fd = open(dev->path, O_RDONLY);
+ if (fd == -1) {
+ warn(_("cannot open %s"), dev->path);
+ goto err;
+ }
+
+ if (fstat(fd, &st) < 0) {
+ warn(_("stat of %s failed"), dev->path);
+ goto err;
+ }
+
+ permMask = S_ISBLK(st.st_mode) ? 07007 : 07077;
+ if ((st.st_mode & permMask) != 0)
+ warnx(_("%s: insecure permissions %04o, %04o suggested."),
+ dev->path, st.st_mode & 07777,
+ ~permMask & 0666);
+
+ if (S_ISREG(st.st_mode) && st.st_uid != 0)
+ warnx(_("%s: insecure file owner %d, 0 (root) suggested."),
+ dev->path, st.st_uid);
+
+ /* test for holes by LBT */
+ if (S_ISREG(st.st_mode)) {
+ if (st.st_blocks * 512 < st.st_size) {
+ warnx(_("%s: skipping - it appears to have holes."),
+ dev->path);
+ goto err;
+ }
+ devsize = st.st_size;
+ }
+
+ if (S_ISBLK(st.st_mode) && blkdev_get_size(fd, &devsize)) {
+ warnx(_("%s: get size failed"), dev->path);
+ goto err;
+ }
+
+ hdr = swap_get_header(fd, &sig, &dev->pagesize);
+ if (!hdr) {
+ warnx(_("%s: read swap header failed"), dev->path);
+ goto err;
+ }
+
+ if (ctl->verbose)
+ warnx(_("%s: found signature [pagesize=%d, signature=%s]"),
+ dev->path,
+ dev->pagesize,
+ sig == SIG_SWAPSPACE ? "swap" :
+ sig == SIG_SWSUSPEND ? "suspend" : "unknown");
+
+ if (sig == SIG_SWAPSPACE && dev->pagesize) {
+ unsigned long long swapsize = swap_get_size(dev, hdr);
+ int syspg = getpagesize();
+
+ if (ctl->verbose)
+ warnx(_("%s: pagesize=%d, swapsize=%llu, devsize=%llu"),
+ dev->path, dev->pagesize, swapsize, devsize);
+
+ if (swapsize > devsize) {
+ if (ctl->verbose)
+ warnx(_("%s: last_page 0x%08llx is larger"
+ " than actual size of swapspace"),
+ dev->path, swapsize);
+
+ } else if (syspg < 0 || (unsigned int) syspg != dev->pagesize) {
+ if (ctl->fix_page_size) {
+ int rc;
+
+ swap_get_info(dev, hdr);
+
+ warnx(_("%s: swap format pagesize does not match."),
+ dev->path);
+ rc = swap_reinitialize(dev);
+ if (rc < 0)
+ goto err;
+ } else
+ warnx(_("%s: swap format pagesize does not match. "
+ "(Use --fixpgsz to reinitialize it.)"),
+ dev->path);
+ }
+ } else if (sig == SIG_SWSUSPEND) {
+ /* We have to reinitialize swap with old (=useless) software suspend
+ * data. The problem is that if we don't do it, then we get data
+ * corruption the next time an attempt at unsuspending is made.
+ */
+ warnx(_("%s: software suspend data detected. "
+ "Rewriting the swap signature."),
+ dev->path);
+ if (swap_rewrite_signature(dev) < 0)
+ goto err;
+ }
+
+ free(hdr);
+ close(fd);
+ return 0;
+err:
+ if (fd != -1)
+ close(fd);
+ free(hdr);
+ return -1;
+}
+
+static int do_swapon(const struct swapon_ctl *ctl,
+ const struct swap_prop *prop,
+ const char *spec,
+ int canonic)
+{
+ struct swap_device dev = { .path = NULL };
+ int status;
+ int flags = 0;
+ int priority;
+
+ assert(ctl);
+ assert(prop);
+
+ if (!canonic) {
+ dev.path = mnt_resolve_spec(spec, mntcache);
+ if (!dev.path)
+ return cannot_find(spec);
+ } else
+ dev.path = spec;
+
+ priority = prop->priority;
+
+ if (swapon_checks(ctl, &dev))
+ return -1;
+
+#ifdef SWAP_FLAG_PREFER
+ if (priority >= 0) {
+ if (priority > SWAP_FLAG_PRIO_MASK)
+ priority = SWAP_FLAG_PRIO_MASK;
+
+ flags = SWAP_FLAG_PREFER
+ | ((priority & SWAP_FLAG_PRIO_MASK)
+ << SWAP_FLAG_PRIO_SHIFT);
+ }
+#endif
+ /*
+ * Validate the discard flags passed and set them
+ * accordingly before calling sys_swapon.
+ */
+ if (prop->discard && !(prop->discard & ~SWAP_FLAGS_DISCARD_VALID)) {
+ /*
+ * If we get here with both discard policy flags set,
+ * we just need to tell the kernel to enable discards
+ * and it will do correctly, just as we expect.
+ */
+ if ((prop->discard & SWAP_FLAG_DISCARD_ONCE) &&
+ (prop->discard & SWAP_FLAG_DISCARD_PAGES))
+ flags |= SWAP_FLAG_DISCARD;
+ else
+ flags |= prop->discard;
+ }
+
+ if (ctl->verbose)
+ printf(_("swapon %s\n"), dev.path);
+
+ status = swapon(dev.path, flags);
+ if (status < 0)
+ warn(_("%s: swapon failed"), dev.path);
+
+ return status;
+}
+
+static int swapon_by_label(struct swapon_ctl *ctl, const char *label)
+{
+ char *device = mnt_resolve_tag("LABEL", label, mntcache);
+ return device ? do_swapon(ctl, &ctl->props, device, TRUE) : cannot_find(label);
+}
+
+static int swapon_by_uuid(struct swapon_ctl *ctl, const char *uuid)
+{
+ char *device = mnt_resolve_tag("UUID", uuid, mntcache);
+ return device ? do_swapon(ctl, &ctl->props, device, TRUE) : cannot_find(uuid);
+}
+
+/* -o <options> or fstab */
+static int parse_options(struct swap_prop *props, const char *options)
+{
+ char *arg = NULL;
+ size_t argsz = 0;
+
+ assert(props);
+ assert(options);
+
+ if (mnt_optstr_get_option(options, "nofail", NULL, NULL) == 0)
+ props->no_fail = 1;
+
+ if (mnt_optstr_get_option(options, "discard", &arg, &argsz) == 0) {
+ props->discard |= SWAP_FLAG_DISCARD;
+
+ if (arg) {
+ /* only single-time discards are wanted */
+ if (strncmp(arg, "once", argsz) == 0)
+ props->discard |= SWAP_FLAG_DISCARD_ONCE;
+
+ /* do discard for every released swap page */
+ if (strncmp(arg, "pages", argsz) == 0)
+ props->discard |= SWAP_FLAG_DISCARD_PAGES;
+ }
+ }
+
+ arg = NULL;
+ if (mnt_optstr_get_option(options, "pri", &arg, NULL) == 0 && arg)
+ props->priority = atoi(arg);
+
+ return 0;
+}
+
+
+static int swapon_all(struct swapon_ctl *ctl)
+{
+ struct libmnt_table *tb = get_fstab();
+ struct libmnt_iter *itr;
+ struct libmnt_fs *fs;
+ int status = 0;
+
+ if (!tb)
+ err(EXIT_FAILURE, _("failed to parse %s"), mnt_get_fstab_path());
+
+ itr = mnt_new_iter(MNT_ITER_FORWARD);
+ if (!itr)
+ err(EXIT_FAILURE, _("failed to initialize libmount iterator"));
+
+ while (mnt_table_find_next_fs(tb, itr, match_swap, NULL, &fs) == 0) {
+ /* defaults */
+ const char *opts;
+ const char *device;
+ struct swap_prop prop; /* per device setting */
+
+ if (mnt_fs_get_option(fs, "noauto", NULL, NULL) == 0) {
+ if (ctl->verbose)
+ warnx(_("%s: noauto option -- ignored"), mnt_fs_get_source(fs));
+ continue;
+ }
+
+ /* default setting */
+ prop = ctl->props;
+
+ /* overwrite default by setting from fstab */
+ opts = mnt_fs_get_options(fs);
+ if (opts)
+ parse_options(&prop, opts);
+
+ /* convert LABEL=, UUID= etc. from fstab to device name */
+ device = mnt_resolve_spec(mnt_fs_get_source(fs), mntcache);
+ if (!device) {
+ if (!prop.no_fail)
+ status |= cannot_find(mnt_fs_get_source(fs));
+ continue;
+ }
+
+ if (is_active_swap(device)) {
+ if (ctl->verbose)
+ warnx(_("%s: already active -- ignored"), device);
+ continue;
+ }
+
+ if (prop.no_fail && access(device, R_OK) != 0) {
+ if (ctl->verbose)
+ warnx(_("%s: inaccessible -- ignored"), device);
+ continue;
+ }
+
+ /* swapon */
+ status |= do_swapon(ctl, &prop, device, TRUE);
+ }
+
+ mnt_free_iter(itr);
+ return status;
+}
+
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ size_t i;
+
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %s [options] [<spec>]\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Enable devices and files for paging and swapping.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -a, --all enable all swaps from /etc/fstab\n"), out);
+ fputs(_(" -d, --discard[=<policy>] enable swap discards, if supported by device\n"), out);
+ fputs(_(" -e, --ifexists silently skip devices that do not exist\n"), out);
+ fputs(_(" -f, --fixpgsz reinitialize the swap space if necessary\n"), out);
+ fputs(_(" -o, --options <list> comma-separated list of swap options\n"), out);
+ fputs(_(" -p, --priority <prio> specify the priority of the swap device\n"), out);
+ fputs(_(" -s, --summary display summary about used swap devices (DEPRECATED)\n"), out);
+ fputs(_(" --show[=<columns>] display summary in definable table\n"), out);
+ fputs(_(" --noheadings don't print table heading (with --show)\n"), out);
+ fputs(_(" --raw use the raw output format (with --show)\n"), out);
+ fputs(_(" --bytes display swap size in bytes in --show output\n"), out);
+ fputs(_(" -v, --verbose verbose mode\n"), out);
+
+ fputs(USAGE_SEPARATOR, out);
+ printf(USAGE_HELP_OPTIONS(26));
+
+ fputs(_("\nThe <spec> parameter:\n" \
+ " -L <label> synonym for LABEL=<label>\n"
+ " -U <uuid> synonym for UUID=<uuid>\n"
+ " LABEL=<label> specifies device by swap area label\n"
+ " UUID=<uuid> specifies device by swap area UUID\n"
+ " PARTLABEL=<label> specifies device by partition label\n"
+ " PARTUUID=<uuid> specifies device by partition UUID\n"
+ " <device> name of device to be used\n"
+ " <file> name of file to be used\n"), out);
+
+ fputs(_("\nAvailable discard policy types (for --discard):\n"
+ " once : only single-time area discards are issued\n"
+ " pages : freed pages are discarded before they are reused\n"
+ "If no policy is selected, both discard types are enabled (default).\n"), out);
+
+ fputs(USAGE_COLUMNS, out);
+ for (i = 0; i < ARRAY_SIZE(infos); i++)
+ fprintf(out, " %-5s %s\n", infos[i].name, _(infos[i].help));
+
+ printf(USAGE_MAN_TAIL("swapon(8)"));
+ exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char *argv[])
+{
+ int status = 0, c;
+ size_t i;
+ char *options = NULL;
+
+ enum {
+ BYTES_OPTION = CHAR_MAX + 1,
+ NOHEADINGS_OPTION,
+ RAW_OPTION,
+ SHOW_OPTION,
+ OPT_LIST_TYPES
+ };
+
+ static const struct option long_opts[] = {
+ { "priority", required_argument, NULL, 'p' },
+ { "discard", optional_argument, NULL, 'd' },
+ { "ifexists", no_argument, NULL, 'e' },
+ { "options", optional_argument, NULL, 'o' },
+ { "summary", no_argument, NULL, 's' },
+ { "fixpgsz", no_argument, NULL, 'f' },
+ { "all", no_argument, NULL, 'a' },
+ { "help", no_argument, NULL, 'h' },
+ { "verbose", no_argument, NULL, 'v' },
+ { "version", no_argument, NULL, 'V' },
+ { "show", optional_argument, NULL, SHOW_OPTION },
+ { "output-all", no_argument, NULL, OPT_LIST_TYPES },
+ { "noheadings", no_argument, NULL, NOHEADINGS_OPTION },
+ { "raw", no_argument, NULL, RAW_OPTION },
+ { "bytes", no_argument, NULL, BYTES_OPTION },
+ { NULL, 0, NULL, 0 }
+ };
+
+ static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
+ { 'a','o','s', SHOW_OPTION },
+ { 'a','o', BYTES_OPTION },
+ { 'a','o', NOHEADINGS_OPTION },
+ { 'a','o', RAW_OPTION },
+ { 0 }
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ struct swapon_ctl ctl;
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ memset(&ctl, 0, sizeof(struct swapon_ctl));
+ ctl.props.priority = -1;
+
+ mnt_init_debug(0);
+ mntcache = mnt_new_cache();
+
+ while ((c = getopt_long(argc, argv, "ahd::efo:p:svVL:U:",
+ long_opts, NULL)) != -1) {
+
+ err_exclusive_options(c, long_opts, excl, excl_st);
+
+ switch (c) {
+ case 'a': /* all */
+ ctl.all = 1;
+ break;
+ case 'h': /* help */
+ usage();
+ break;
+ case 'o':
+ options = optarg;
+ break;
+ case 'p': /* priority */
+ ctl.props.priority = strtos16_or_err(optarg,
+ _("failed to parse priority"));
+ break;
+ case 'L':
+ add_label(optarg);
+ break;
+ case 'U':
+ add_uuid(optarg);
+ break;
+ case 'd':
+ ctl.props.discard |= SWAP_FLAG_DISCARD;
+ if (optarg) {
+ if (*optarg == '=')
+ optarg++;
+
+ if (strcmp(optarg, "once") == 0)
+ ctl.props.discard |= SWAP_FLAG_DISCARD_ONCE;
+ else if (strcmp(optarg, "pages") == 0)
+ ctl.props.discard |= SWAP_FLAG_DISCARD_PAGES;
+ else
+ errx(EXIT_FAILURE, _("unsupported discard policy: %s"), optarg);
+ }
+ break;
+ case 'e': /* ifexists */
+ ctl.props.no_fail = 1;
+ break;
+ case 'f':
+ ctl.fix_page_size = 1;
+ break;
+ case 's': /* status report */
+ status = display_summary();
+ return status;
+ case 'v': /* be chatty */
+ ctl.verbose = 1;
+ break;
+ case SHOW_OPTION:
+ if (optarg) {
+ ctl.ncolumns = string_to_idarray(optarg,
+ ctl.columns,
+ ARRAY_SIZE(ctl.columns),
+ column_name_to_id);
+ if (ctl.ncolumns < 0)
+ return EXIT_FAILURE;
+ }
+ ctl.show = 1;
+ break;
+ case OPT_LIST_TYPES:
+ for (ctl.ncolumns = 0; (size_t)ctl.ncolumns < ARRAY_SIZE(infos); ctl.ncolumns++)
+ ctl.columns[ctl.ncolumns] = ctl.ncolumns;
+ break;
+ case NOHEADINGS_OPTION:
+ ctl.no_heading = 1;
+ break;
+ case RAW_OPTION:
+ ctl.raw = 1;
+ break;
+ case BYTES_OPTION:
+ ctl.bytes = 1;
+ break;
+ case 'V': /* version */
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+ case 0:
+ break;
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+ argv += optind;
+
+ if (ctl.show || (!ctl.all && !numof_labels() && !numof_uuids() && *argv == NULL)) {
+ if (!ctl.ncolumns) {
+ /* default columns */
+ ctl.columns[ctl.ncolumns++] = COL_PATH;
+ ctl.columns[ctl.ncolumns++] = COL_TYPE;
+ ctl.columns[ctl.ncolumns++] = COL_SIZE;
+ ctl.columns[ctl.ncolumns++] = COL_USED;
+ ctl.columns[ctl.ncolumns++] = COL_PRIO;
+ }
+ status = show_table(&ctl);
+ return status;
+ }
+
+ if (ctl.props.no_fail && !ctl.all) {
+ warnx(_("bad usage"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ if (ctl.all)
+ status |= swapon_all(&ctl);
+
+ if (options)
+ parse_options(&ctl.props, options);
+
+ for (i = 0; i < numof_labels(); i++)
+ status |= swapon_by_label(&ctl, get_label(i));
+
+ for (i = 0; i < numof_uuids(); i++)
+ status |= swapon_by_uuid(&ctl, get_uuid(i));
+
+ while (*argv != NULL)
+ status |= do_swapon(&ctl, &ctl.props, *argv++, FALSE);
+
+ free_tables();
+ mnt_unref_cache(mntcache);
+
+ return status;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 05:09:36 +0000