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path-util: in path_is_mount_point() fall back to the classic stat() test if fs does not support name_to_handle_at()

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This commit is contained in:
Lennart Poettering 2012-09-04 16:37:57 -07:00
parent 014a9c777b
commit 1640a0b6b0
1 changed files with 35 additions and 1 deletions
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36
src/shared/path-util.c
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@ -335,6 +335,7 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
int r;
struct file_handle *h;
int mount_id, mount_id_parent;
struct stat a, b;
/* We are not actually interested in the file handles, but
* name_to_handle_at() also passes us the mount ID, hence use
@ -348,6 +349,12 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
r = name_to_handle_at(AT_FDCWD, t, h, &mount_id, allow_symlink ? AT_SYMLINK_FOLLOW : 0);
if (r < 0) {
if (errno == ENOTSUP)
/* This file system does not support
* name_to_handle_at(), hence fallback to the
* traditional stat() logic */
goto fallback;
if (errno == ENOENT)
return 0;
@ -362,11 +369,38 @@ int path_is_mount_point(const char *t, bool allow_symlink) {
r = name_to_handle_at(AT_FDCWD, parent, h, &mount_id_parent, 0);
free(parent);
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 (errno == ENOTSUP)
return 1;
return -errno;
}
return mount_id != mount_id_parent;
fallback:
if (allow_symlink)
r = stat(t, &a);
else
r = lstat(t, &b);
if (r < 0)
return -errno;
r = path_get_parent(t, &parent);
if (r < 0)
return r;
return mount_id != mount_id_parent;
r = lstat(parent, &b);
free(parent);
if (r < 0)
return -errno;
return a.st_dev != b.st_dev;
}
int path_is_read_only_fs(const char *path) {