/**
* mnt_resolve_path:
* @path: "native" path
* @cache: cache for results or NULL
*
* Converts path:
* - to the absolute path
* - /dev/dm-N to /dev/mapper/name
*
* Returns: absolute path or NULL in case of error. The result has to be
* deallocated by free() if @cache is NULL.
*/
char *mnt_resolve_path(const char *path, struct libmnt_cache *cache)
{
char *p = NULL;
/*DBG(CACHE, ul_debugobj(cache, "resolving path %s", path));*/
if (!path)
return NULL;
if (cache)
p = (char *) cache_find_path(cache, path);
if (!p)
p = canonicalize_path_and_cache(path, cache);
return p;
}
/**
* mnt_resolve_target:
* @path: "native" path, a potential mount point
* @cache: cache for results or NULL.
*
* Like mnt_resolve_path(), unless @cache is not NULL and
* mnt_cache_set_targets(cache, mtab) was called: if @path is found in the
* cached @mtab and the matching entry was provided by the kernel, assume that
* @path is already canonicalized. By avoiding a call to realpath(2) on
* known mount points, there is a lower risk of stepping on a stale mount
* point, which can result in an application freeze. This is also faster in
* general, as stat(2) on a mount point is slower than on a regular file.
*
* Returns: absolute path or NULL in case of error. The result has to be
* deallocated by free() if @cache is NULL.
*/
char *mnt_resolve_target(const char *path, struct libmnt_cache *cache)
{
char *p = NULL;
/*DBG(CACHE, ul_debugobj(cache, "resolving target %s", path));*/
if (!cache || !cache->mtab)
return mnt_resolve_path(path, cache);
p = (char *) cache_find_path(cache, path);
if (p)
return p;
else {
struct libmnt_iter itr;
struct libmnt_fs *fs = NULL;
mnt_reset_iter(&itr, MNT_ITER_BACKWARD);
while (mnt_table_next_fs(cache->mtab, &itr, &fs) == 0) {
if (!mnt_fs_is_kernel(fs)
|| mnt_fs_is_swaparea(fs)
|| !mnt_fs_streq_target(fs, path))
continue;
p = strdup(path);
if (!p)
return NULL; /* ENOMEM */
if (cache_add_entry(cache, p, p, MNT_CACHE_ISPATH)) {
free(p);
return NULL; /* ENOMEM */
}
break;
}
}
if (!p)
p = canonicalize_path_and_cache(path, cache);
return p;
}
/**
* mnt_resolve_path:
* @path: "native" path
* @cache: cache for results or NULL
*
* Converts path:
* - to the absolute path
* - /dev/dm-N to /dev/mapper/name
*
* Returns: absolute path or NULL in case of error. The result has to be
* deallocated by free() if @cache is NULL.
*/
char *mnt_resolve_path(const char *path, struct libmnt_cache *cache)
{
char *p = NULL;
char *key = NULL;
char *value = NULL;
/*DBG(CACHE, mnt_debug_h(cache, "resolving path %s", path));*/
if (!path)
return NULL;
if (cache)
p = (char *) cache_find_path(cache, path);
if (!p) {
p = canonicalize_path(path);
if (p && cache) {
value = p;
key = strcmp(path, p) == 0 ? value : strdup(path);
if (!key || !value)
goto error;
if (cache_add_entry(cache, key, value,
MNT_CACHE_ISPATH))
goto error;
}
}
return p;
error:
if (value != key)
free(value);
free(key);
return NULL;
}
