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authorIan Kent <ikent@redhat.com>2016-11-24 00:03:41 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-12-04 04:51:35 +0300
commitc6609c0a1c34fc097152b28b496236625673924f (patch)
tree864cfb55fd8727e2a475ca44dd8d7df5a8488005 /include/linux/mount.h
parentfb5f51c7425ebc808d91329257cbc963e2421368 (diff)
downloadlinux-c6609c0a1c34fc097152b28b496236625673924f.tar.xz
vfs: add path_is_mountpoint() helper
d_mountpoint() can only be used reliably to establish if a dentry is not mounted in any namespace. It isn't aware of the possibility there may be multiple mounts using a given dentry that may be in a different namespace. Add helper functions, path_is_mountpoint(), that checks if a struct path is a mountpoint for this case. Link: http://lkml.kernel.org/r/20161011053358.27645.9729.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>
Diffstat (limited to 'include/linux/mount.h')
-rw-r--r--include/linux/mount.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 1172cce949a4..5b6dd004bfdc 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -98,4 +98,6 @@ extern dev_t name_to_dev_t(const char *name);
extern unsigned int sysctl_mount_max;
+extern bool path_is_mountpoint(const struct path *path);
+
#endif /* _LINUX_MOUNT_H */