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/*
* by rmk
*
* Decode mount options.
*/
#include <sys/mount.h>
#include <stdlib.h>
#include <string.h>
#include "mount_opts.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
static const struct mount_opts options[] = {
/* name mask set noset */
{"async", MS_SYNCHRONOUS, 0, MS_SYNCHRONOUS},
{"atime", MS_NOATIME, 0, MS_NOATIME},
{"bind", MS_TYPE, MS_BIND, 0,},
{"dev", MS_NODEV, 0, MS_NODEV},
{"diratime", MS_NODIRATIME, 0, MS_NODIRATIME},
{"dirsync", MS_DIRSYNC, MS_DIRSYNC, 0},
{"exec", MS_NOEXEC, 0, MS_NOEXEC},
{"move", MS_TYPE, MS_MOVE, 0},
{"nodev", MS_NODEV, MS_NODEV, 0},
{"noexec", MS_NOEXEC, MS_NOEXEC, 0},
{"nosuid", MS_NOSUID, MS_NOSUID, 0},
{"recurse", MS_REC, MS_REC, 0},
{"remount", MS_TYPE, MS_REMOUNT, 0},
{"ro", MS_RDONLY, MS_RDONLY, 0},
{"rw", MS_RDONLY, 0, MS_RDONLY},
{"suid", MS_NOSUID, 0, MS_NOSUID},
{"sync", MS_SYNCHRONOUS, MS_SYNCHRONOUS, 0},
{"verbose", MS_VERBOSE, MS_VERBOSE, 0},
};
static void add_extra_option(struct extra_opts *extra, char *s)
{
int len = strlen(s);
int newlen = extra->used_size + len;
if (extra->str)
len++; /* +1 for ',' */
if (newlen >= extra->alloc_size) {
char *new;
new = realloc(extra->str, newlen + 1); /* +1 for NUL */
if (!new)
return;
extra->str = new;
extra->end = extra->str + extra->used_size;
extra->alloc_size = newlen;
}
if (extra->used_size) {
*extra->end = ',';
extra->end++;
}
strcpy(extra->end, s);
extra->used_size += len;
}
unsigned long
parse_mount_options(char *arg, unsigned long rwflag, struct extra_opts *extra)
{
char *s;
while ((s = strsep(&arg, ",")) != NULL) {
char *opt = s;
unsigned int i;
int res, no = s[0] == 'n' && s[1] == 'o';
if (no)
s += 2;
for (i = 0, res = 1; i < ARRAY_SIZE(options); i++) {
res = strcmp(s, options[i].str);
if (res == 0) {
rwflag &= ~options[i].rwmask;
if (no)
rwflag |= options[i].rwnoset;
else
rwflag |= options[i].rwset;
}
if (res <= 0)
break;
}
if (res != 0 && s[0]) {
if (!strcmp(opt, "defaults"))
rwflag &= ~(MS_RDONLY|MS_NOSUID|MS_NODEV|
MS_NOEXEC|MS_SYNCHRONOUS);
else
add_extra_option(extra, opt);
}
}
return rwflag;
}
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