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authorLennart Poettering <lennart@poettering.net>2012-08-25 00:10:17 +0200
committerLennart Poettering <lennart@poettering.net>2012-09-03 18:59:05 -0700
commitcde9cb343ae101660dd36992cae730b63c7cd617 (patch)
tree3ce2d681b3d5d0db41da1b005230bd5a52a21ba1 /src
parentddffe892464b95630f2e1c9c6eefd6d30d36dec2 (diff)
util: make path_is_mount_point() recognize bind mounts, too
Diffstat (limited to 'src')
-rw-r--r--src/shared/path-util.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index 8bc7955020..2bdbd22dc7 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -330,15 +330,22 @@ bool path_equal(const char *a, const char *b) {
}
int path_is_mount_point(const char *t, bool allow_symlink) {
- struct stat a, b;
char *parent;
int r;
+ struct file_handle *h;
+ int mount_id, mount_id_parent;
- if (allow_symlink)
- r = stat(t, &a);
- else
- r = lstat(t, &a);
+ /* We are not actually interested in the file handles, but
+ * name_to_handle_at() also passes us the mount ID, hence use
+ * it but throw the handle away */
+
+ if (path_equal(t, "/"))
+ return 1;
+ h = alloca(MAX_HANDLE_SZ);
+ h->handle_bytes = MAX_HANDLE_SZ;
+
+ r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
if (r < 0) {
if (errno == ENOENT)
return 0;
@@ -350,13 +357,15 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
if (r < 0)
return r;
- r = lstat(parent, &b);
+ h->handle_bytes = MAX_HANDLE_SZ;
+ r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
free(parent);
if (r < 0)
return -errno;
- return a.st_dev != b.st_dev;
+
+ return mount_id != mount_id_parent;
}
int path_is_read_only_fs(const char *path) {