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util: improve comments why we ignore EACCES and EPERM

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Follow-up for ef454fd193 (#9848).
This commit is contained in:
Yu Watanabe 2018-08-11 22:47:22 +09:00 committed by Zbigniew Jędrzejewski-Szmek
parent 06fc4324b8
commit 53c442ef63
1 changed files with 8 additions and 1 deletions
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9
src/basic/mount-util.c
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@ -544,7 +544,14 @@ int bind_remount_recursive_with_mountinfo(const char *prefix, bool ro, char **bl
if (IN_SET(r, 0, -ENOENT))
continue;
if (IN_SET(r, -EACCES, -EPERM)) {
/* Even if root user invoke this, FUSE or NFS mount points may not be acceessed. */
/* Even if root user invoke this, submounts under private FUSE or NFS mount points
* may not be acceessed. E.g.,
*
* $ bindfs --no-allow-other ~/mnt/mnt ~/mnt/mnt
* $ bindfs --no-allow-other ~/mnt ~/mnt
*
* Then, root user cannot access the mount point ~/mnt/mnt.
* In such cases, the submounts are ignored, as we have no way to manage them. */
log_debug_errno(r, "Failed to determine '%s' is mount point or not, ignoring: %m", x);
continue;
}