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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-12-17 21:05:58 -0500
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-12-17 21:08:16 -0500
commit6feeeab0bc40b5a7f208adf79909fb85e2208e8e (patch)
tree173d3752b22b7b76f0fe5815945c300c2c949e3f
parentb890bf6a81acfc989743ef7a66ba5710aec66411 (diff)
path: make the check for unsupported name_to_handle_at symmetric
If child supports, but the parent does not, or when the child does not support, but the parent does, assume the child is a mount point. Only if neither supports use the fallback.
-rw-r--r--src/shared/path-util.c35
1 files changed, 20 insertions, 15 deletions
diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index fae5d20ebb..8c43d060fb 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -462,6 +462,7 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
_cleanup_free_ char *parent = NULL;
struct stat a, b;
int r;
+ bool nosupp = false;
/* We are not actually interested in the file handles, but
* name_to_handle_at() also passes us the mount ID, hence use
@@ -476,12 +477,11 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
/* This kernel or file system does not support
* name_to_handle_at(), hence fallback to the
* traditional stat() logic */
- goto fallback;
-
- if (errno == ENOENT)
+ nosupp = true;
+ else if (errno == ENOENT)
return 0;
-
- return -errno;
+ else
+ return -errno;
}
r = path_get_parent(t, &parent);
@@ -490,17 +490,22 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
h.handle.handle_bytes = MAX_HANDLE_SZ;
r = name_to_handle_at(AT_FDCWD, parent, &h.handle, &mount_id_parent, AT_SYMLINK_FOLLOW);
- if (r < 0) {
- /* The parent can't do name_to_handle_at() but the
- * directory we are interested in can? If so, it must
- * be a mount point */
+ if (r < 0)
if (errno == EOPNOTSUPP)
- return 1;
-
- return -errno;
- }
-
- return mount_id != mount_id_parent;
+ if (nosupp)
+ /* Neither parent nor child do name_to_handle_at()?
+ We have no choice but to fall back. */
+ goto fallback;
+ else
+ /* The parent can't do name_to_handle_at() but
+ * the directory we are interested in can?
+ * Or the other way around?
+ * If so, it must be a mount point. */
+ return 1;
+ else
+ return -errno;
+ else
+ return mount_id != mount_id_parent;
fallback:
if (allow_symlink)