autofs: use path_has_submounts() to fix unreliable have_submount() checks

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If an automount mount is clone(2)ed into a file system that is propagation
private, when it later expires in the originating namespace, subsequent
calls to autofs ->d_automount() for that dentry in the original namespace
will return ELOOP until the mount is umounted in the cloned namespace.

Now that a struct path is available where needed use path_has_submounts()
instead of have_submounts() so we don't get false positives when checking
if a dentry is a mount point or contains mounts in the current namespace.

Link: http://lkml.kernel.org/r/20161011053423.27645.91233.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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This commit is contained in:

Ian Kent 2016-11-24 08:03:42 +11:00 • committed by Al Viro

parent cfaf86ab6c

commit 6035974147

3 changed files with 15 additions and 11 deletions

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2

fs/autofs4/dev-ioctl.c

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14

fs/autofs4/root.c

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10

fs/autofs4/waitq.c

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