mount: support "-O option"; stop trying to mount swap partitions
function old new delta
mount_main 975 1152 +177
umount_main 640 636 -4
packed_usage 25666 25662 -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 177/-8) Total: 169 bytes
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 3b83113..d647c71 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -63,7 +63,7 @@
};
-#define OPTION_STR "o:t:rwanfvsi"
+#define OPTION_STR "o:t:rwanfvsiO:"
enum {
OPT_o = (1 << 0),
OPT_t = (1 << 1),
@@ -75,6 +75,7 @@
OPT_v = (1 << 7),
OPT_s = (1 << 8),
OPT_i = (1 << 9),
+ OPT_O = (1 << 10),
};
#if ENABLE_FEATURE_MTAB_SUPPORT
@@ -1721,6 +1722,45 @@
return rc;
}
+/* -O support
+ * Unlike -t, -O should interpret "no" prefix differently:
+ * -t noa,b,c = -t no(a,b,c) = mount all except fs'es with types a,b, and c
+ * -O noa,b,c = -O noa,b,c = mount all with without option a,
+ * or with option b or c.
+ * But for now we do not support -O a,b,c at all (only -O a).
+ *
+ * Another difference from -t support (match_fstype) is that
+ * we need to examine the _list_ of options in fsopt, not just a string.
+ */
+static int match_opt(const char *fs_opt, const char *O_opt)
+{
+ int match = 1;
+ int len;
+
+ if (!O_opt)
+ return match;
+
+ if (O_opt[0] == 'n' && O_opt[1] == 'o') {
+ match--;
+ O_opt += 2;
+ }
+
+ len = strlen(O_opt);
+ while (1) {
+ if (strncmp(fs_opt, O_opt, len) == 0
+ && (fs_opt[len] == '\0' || fs_opt[len] == ',')
+ ) {
+ return match;
+ }
+ fs_opt = strchr(fs_opt, ',');
+ if (!fs_opt)
+ break;
+ fs_opt++;
+ }
+
+ return !match;
+}
+
// Parse options, if necessary parse fstab/mtab, and call singlemount for
// each directory to be mounted.
static const char must_be_root[] ALIGN1 = "you must be root";
@@ -1728,8 +1768,9 @@
int mount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mount_main(int argc UNUSED_PARAM, char **argv)
{
- char *cmdopts = xstrdup("");
+ char *cmdopts = xzalloc(1);
char *fstype = NULL;
+ char *O_optmatch = NULL;
char *storage_path;
llist_t *lst_o = NULL;
const char *fstabname;
@@ -1752,9 +1793,9 @@
argv[j] = NULL;
// Parse remaining options
- // Max 2 params; -v is a counter
- opt_complementary = "?2o::" USE_FEATURE_MOUNT_VERBOSE(":vv");
- opt = getopt32(argv, OPTION_STR, &lst_o, &fstype
+ // Max 2 params; -o is a list, -v is a counter
+ opt_complementary = "?2o::" USE_FEATURE_MOUNT_VERBOSE("vv");
+ opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
USE_FEATURE_MOUNT_VERBOSE(, &verbose));
while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
@@ -1807,7 +1848,7 @@
// Past this point, we are handling either "mount -a [opts]"
// or "mount [opts] single_param"
- i = parse_mount_options(cmdopts, 0); // FIXME: should be "long", not "int"
+ i = parse_mount_options(cmdopts, NULL); // FIXME: should be "long", not "int"
if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags
bb_error_msg_and_die(must_be_root);
@@ -1865,20 +1906,29 @@
// If we're mounting all
} else {
- // Do we need to match a filesystem type?
- if (fstype && match_fstype(mtcur, fstype))
- continue;
-
- // Skip noauto and swap anyway.
- if (parse_mount_options(mtcur->mnt_opts, 0) & (MOUNT_NOAUTO | MOUNT_SWAP))
- continue;
-
// No, mount -a won't mount anything,
// even user mounts, for mere humans
if (nonroot)
bb_error_msg_and_die(must_be_root);
- resolve_mount_spec(&mtpair->mnt_fsname);
+ // Does type match? (NULL matches always)
+ if (!match_fstype(mtcur, fstype))
+ continue;
+
+ // Skip noauto and swap anyway.
+ if ((parse_mount_options(mtcur->mnt_opts, NULL) & (MOUNT_NOAUTO | MOUNT_SWAP))
+ // swap is bogus "fstype", parse_mount_options can't check fstypes
+ || strcasecmp(mtcur->mnt_type, "swap") == 0
+ ) {
+ continue;
+ }
+
+ // Does (at least one) option match?
+ // (NULL matches always)
+ if (!match_opt(mtcur->mnt_opts, O_optmatch))
+ continue;
+
+ resolve_mount_spec(&mtcur->mnt_fsname);
// NFS mounts want this to be xrealloc-able
mtcur->mnt_opts = xstrdup(mtcur->mnt_opts);
@@ -1895,13 +1945,35 @@
// End of fstab/mtab is reached.
// Were we looking for something specific?
if (argv[0]) {
+ long l;
+
// If we didn't find anything, complain
if (!mtcur->mnt_fsname)
bb_error_msg_and_die("can't find %s in %s",
argv[0], fstabname);
+
+ // What happens when we try to "mount swap_partition"?
+ // (fstab containts "swap_partition swap swap defaults 0 0")
+ // util-linux-ng 2.13.1 does this:
+ // stat("/sbin/mount.swap", 0x7fff62a3a350) = -1 ENOENT (No such file or directory)
+ // mount("swap_partition", "swap", "swap", MS_MGC_VAL, NULL) = -1 ENOENT (No such file or directory)
+ // lstat("swap", 0x7fff62a3a640) = -1 ENOENT (No such file or directory)
+ // write(2, "mount: mount point swap does not exist\n", 39) = 39
+ // exit_group(32) = ?
+#if 0
+ // In case we want to simply skip swap partitions:
+ l = parse_mount_options(mtcur->mnt_opts, NULL);
+ if ((l & MOUNT_SWAP)
+ // swap is bogus "fstype", parse_mount_options can't check fstypes
+ || strcasecmp(mtcur->mnt_type, "swap") == 0
+ ) {
+ goto ret;
+ }
+#endif
if (nonroot) {
// fstab must have "users" or "user"
- if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS))
+ l = parse_mount_options(mtcur->mnt_opts, NULL);
+ if (!(l & MOUNT_USERS))
bb_error_msg_and_die(must_be_root);
}
@@ -1914,6 +1986,7 @@
free(mtcur->mnt_opts);
}
+ //ret:
if (ENABLE_FEATURE_CLEAN_UP)
endmntent(fstab);
if (ENABLE_FEATURE_CLEAN_UP) {