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mount-util: tape over name_to_handle_at() flakiness (#7517) 

Apparently, the kernel returns EINVAL on NFS4 sometimes, even if we do
everything right, let's fallback in that case and find a different
approach to determine if something's a mount point.

See discussion at:

https://github.com/systemd/systemd/issues/7082#issuecomment-348001289
This commit is contained in:
Lennart Poettering 2017-12-01 12:59:16 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent 41f23fe856
commit 976c047841
1 changed files with 4 additions and 3 deletions
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7
src/basic/mount-util.c
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@ -183,10 +183,11 @@ int fd_is_mount_point(int fd, const char *filename, int flags) {
* real mounts of their own. */
r = name_to_handle_at_loop(fd, filename, &h, &mount_id, flags);
if (IN_SET(r, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW))
if (IN_SET(r, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW, -EINVAL))
/* This kernel does not support name_to_handle_at() at all (ENOSYS), or the syscall was blocked
* (EACCES/EPERM; maybe through seccomp, because we are running inside of a container?), or the mount
* point is not triggered yet (EOVERFLOW, thinkg nfs4): fall back to simpler logic. */
* point is not triggered yet (EOVERFLOW, think nfs4), or some general name_to_handle_at() flakiness
* (EINVAL): fall back to simpler logic. */
goto fallback_fdinfo;
else if (r == -EOPNOTSUPP)
/* This kernel or file system does not support name_to_handle_at(), hence let's see if the upper fs
@ -308,7 +309,7 @@ int path_get_mnt_id(const char *path, int *ret) {
int r;
r = name_to_handle_at_loop(AT_FDCWD, path, NULL, ret, 0);
if (IN_SET(r, -EOPNOTSUPP, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW)) /* kernel/fs don't support this, or seccomp blocks access, or untriggered mount */
if (IN_SET(r, -EOPNOTSUPP, -ENOSYS, -EACCES, -EPERM, -EOVERFLOW, -EINVAL)) /* kernel/fs don't support this, or seccomp blocks access, or untriggered mount, or name_to_handle_at() is flaky */
return fd_fdinfo_mnt_id(AT_FDCWD, path, 0, ret);
return r;