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tmpfiles: --clean -- check for bind mounts of the same filesystem and skip them

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This commit is contained in:
Kay Sievers 2013-03-13 13:12:36 +01:00
parent 24a988e9aa
commit 99d680acf1
2 changed files with 42 additions and 2 deletions
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2
TODO
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@ -78,8 +78,6 @@ Features:
* remove any syslog support from log.c -- we probably can't do this before split-off udev is gone for good
* tmpfiles: when traversing the tree, check for bind mount points with nametohandle()
* fedora: connect the timer units of a service to the service via Also= in [Install], and maybe introduce timers.target
* fedora: F20: go timer units all the way, leave cron.daily for cron

42
src/tmpfiles/tmpfiles.c
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@ -213,6 +213,42 @@ static bool unix_socket_alive(const char *fn) {
return true;
}
static int dir_is_mount_point(DIR *d, const char *subdir) {
struct file_handle *h;
int mount_id_parent, mount_id;
int r_p, r;
h = alloca(MAX_HANDLE_SZ);
h->handle_bytes = MAX_HANDLE_SZ;
r_p = name_to_handle_at(dirfd(d), ".", h, &mount_id_parent, 0);
if (r_p < 0)
r_p = -errno;
h->handle_bytes = MAX_HANDLE_SZ;
r = name_to_handle_at(dirfd(d), subdir, h, &mount_id, 0);
if (r < 0)
r = -errno;
/* got no handle; make no assumptions, return error */
if (r_p < 0 && r < 0)
return r_p;
/* got both handles; if they differ, it is a mount point */
if (r_p >= 0 && r >= 0)
return mount_id_parent != mount_id;
/* got only one handle; assume different mount points if one
* of both queries was not supported by the filesystem */
if (r_p == -ENOSYS || r_p == -ENOTSUP || r == -ENOSYS || r == -ENOTSUP)
return true;
/* return error */
if (r_p < 0)
return r_p;
return r;
}
static int dir_cleanup(
Item *i,
const char *p,
@ -252,6 +288,12 @@ static int dir_cleanup(
if (s.st_dev != rootdev)
continue;
/* Try to detect bind mounts of the same filesystem instance; they
* do not differ in device major/minors. This type of query is not
* supported on all kernels or filesystem types though. */
if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0)
continue;
/* Do not delete read-only files owned by root */
if (s.st_uid == 0 && !(s.st_mode & S_IWUSR))
continue;