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Allow to specify the rslabel to use for a file system.

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When a file system is mounted some heuristics are used to define
a RS label for that system. This commit allows to specify the
label to use in an optional mount argument using either
mount -o rslabel=fs_myfs or as a mount option in fstab.

This can be used to start services that later also need to be
accessed directly.
This commit is contained in:
Kees Jongenburger 2012-07-04 12:00:28 +00:00
parent 1fb60d0811
commit 30b5c227e9
1 changed files with 56 additions and 2 deletions
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58
lib/libc/sys-minix/mount.c
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@ -32,6 +32,7 @@ static int rs_down(char *label)
return system(cmd); return system(cmd);
} }
char *find_rslabel(char *args_line);
int mount(special, name, mountflags, type, args) int mount(special, name, mountflags, type, args)
char *name, *special, *type, *args; char *name, *special, *type, *args;
int mountflags; int mountflags;
@ -43,6 +44,7 @@ int mountflags;
char path[PATH_MAX]; char path[PATH_MAX];
char cmd[200]; char cmd[200];
char *p; char *p;
char *rslabel;
int reuse = 0; int reuse = 0;
int use_existing = 0; int use_existing = 0;
@ -80,8 +82,17 @@ int mountflags;
} }
sprintf(label, "fs_%.12s", p); sprintf(label, "fs_%.12s", p);
} else { } else {
if (stat(name, &statbuf) < 0) return -1; /* check for a rslabel option in the arguments and try to use
sprintf(label, "fs_%04x%llx", statbuf.st_dev, statbuf.st_ino); * that.
*/
rslabel = find_rslabel(args);
if (rslabel != NULL){
snprintf(label,16,rslabel);
free(rslabel);
} else {
if (stat(name, &statbuf) < 0) return -1;
sprintf(label, "fs_%04x%llx", statbuf.st_dev, statbuf.st_ino);
}
} }
} else { } else {
/* label to long? */ /* label to long? */
@ -192,3 +203,46 @@ int flags;
return r; return r;
} }
char *find_rslabel(args_line)
char *args_line;
{
/**
* Find and return the rslabel as given as optional
* agument to the mount command e.g.
* mount -o rslabel=bla
* or
* mount -o rw,rslabel=bla
* or as found in fstab
**/
char *buf, *input,*saveptr;
buf = input = saveptr = NULL;
if (args_line == NULL) return NULL;
/* copy the input args_line we are going to modify it*/
input = strndup(args_line,20);
if (input == NULL) /* EOM */
return NULL; /* it is not that bad to not find a label */
/* locate rslabel= in the input */
buf = strstr(input,"rslabel=");
if (buf == NULL) {
free(input);
return NULL;
}
/* tokenise on "," starting from rslabel (e.g null terminate )*/
buf = strtok_r(buf,",",&saveptr);
/* tokenise the result again using = and take the second entry */
buf = strtok_r(buf,"=",&saveptr);
buf = strtok_r(NULL,"=",&saveptr);
/* buf is now either NULL if there was no second token or
* the value we are searchig for
*/
if (buf != NULL)
buf = strdup(buf);
free(input);
return buf;
}