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fstab-util: add fstab_is_mount_point_full which takes a source path to compare

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This commit is contained in:
Mike Yuan
2023-07-26 12:04:07 +08:00
parent 859ecf0aaa
commit 99299d0d5a
2 changed files with 41 additions and 7 deletions
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42
src/shared/fstab-util.c
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@@ -63,23 +63,53 @@ bool fstab_is_extrinsic(const char *mount, const char *opts) {
return false;
}
int fstab_is_mount_point(const char *mount) {
static int fstab_is_mount_point_of(const char *what_fstab, const char *path) {
_cleanup_free_ char *node = NULL;
assert(what_fstab);
assert(path);
node = fstab_node_to_udev_node(what_fstab);
if (!node)
return -ENOMEM;
if (path_equal(node, path))
return true;
if (is_device_node(path) && is_device_node(node))
return devnode_same(node, path);
return false;
}
int fstab_is_mount_point_full(const char *where, const char *path) {
_cleanup_endmntent_ FILE *f = NULL;
struct mntent *m;
int r;
assert(where);
f = setmntent(fstab_path(), "re");
if (!f)
return errno == ENOENT ? false : -errno;
for (;;) {
struct mntent *me;
errno = 0;
m = getmntent(f);
if (!m)
me = getmntent(f);
if (!me)
return errno != 0 ? -errno : false;
if (path_equal(m->mnt_dir, mount))
return true;
if (path_equal(where, me->mnt_dir)) {
if (!path)
return true;
r = fstab_is_mount_point_of(me->mnt_fsname, path);
if (r > 0 || (r < 0 && !ERRNO_IS_DEVICE_ABSENT(r)))
return r;
}
}
return false;
}

6
src/shared/fstab-util.h
View File

@@ -7,9 +7,13 @@
#include "macro.h"
bool fstab_is_extrinsic(const char *mount, const char *opts);
int fstab_is_mount_point(const char *mount);
int fstab_has_fstype(const char *fstype);
int fstab_is_mount_point_full(const char *where, const char *path);
static inline int fstab_is_mount_point(const char *where) {
return fstab_is_mount_point_full(where, NULL);
}
int fstab_filter_options(
const char *opts,
const char *names,