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authorIan Kent <ikent@redhat.com>2016-11-24 08:03:42 +1100
committerAl Viro <viro@zeniv.linux.org.uk>2016-12-03 20:51:48 -0500
commitcfaf86ab6ccdf0acf47ebe474a4a844114bc0e10 (patch)
treed78bb1593f84e1948f86c5323fcdb888e9991b16 /fs/autofs4/root.c
parentdd36a882e7ade2c642f8711426ad8e4b7009aaae (diff)
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autofs: use path_is_mountpoint() to fix unreliable d_mountpoint() checks
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_is_mountpoint() instead of d_mountpoint() so we don't get false positives when checking if a dentry is a mount point in the current namespace. Link: http://lkml.kernel.org/r/20161011053418.27645.15241.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 'fs/autofs4/root.c')
-rw-r--r--fs/autofs4/root.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 0e9881552881..9355608cb495 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -123,7 +123,7 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
* it.
*/
spin_lock(&sbi->lookup_lock);
- if (!d_mountpoint(dentry) && simple_empty(dentry)) {
+ if (!path_is_mountpoint(&file->f_path) && simple_empty(dentry)) {
spin_unlock(&sbi->lookup_lock);
return -ENOENT;
}
@@ -372,15 +372,15 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
/*
* If the dentry is a symlink it's equivalent to a directory
- * having d_mountpoint() true, so there's no need to call back
- * to the daemon.
+ * having path_is_mountpoint() true, so there's no need to call
+ * back to the daemon.
*/
if (d_really_is_positive(dentry) && d_is_symlink(dentry)) {
spin_unlock(&sbi->fs_lock);
goto done;
}
- if (!d_mountpoint(dentry)) {
+ if (!path_is_mountpoint(path)) {
/*
* It's possible that user space hasn't removed directories
* after umounting a rootless multi-mount, although it
@@ -434,7 +434,7 @@ static int autofs4_d_manage(const struct path *path, bool rcu_walk)
/* The daemon never waits. */
if (autofs4_oz_mode(sbi)) {
- if (!d_mountpoint(dentry))
+ if (!path_is_mountpoint(path))
return -EISDIR;
return 0;
}
@@ -463,7 +463,7 @@ static int autofs4_d_manage(const struct path *path, bool rcu_walk)
if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
return 0;
- if (d_mountpoint(dentry))
+ if (path_is_mountpoint(path))
return 0;
inode = d_inode_rcu(dentry);
if (inode && S_ISLNK(inode->i_mode))
@@ -490,7 +490,7 @@ static int autofs4_d_manage(const struct path *path, bool rcu_walk)
* we can avoid needless calls ->d_automount() and avoid
* an incorrect ELOOP error return.
*/
- if ((!d_mountpoint(dentry) && !simple_empty(dentry)) ||
+ if ((!path_is_mountpoint(path) && !simple_empty(dentry)) ||
(d_really_is_positive(dentry) && d_is_symlink(dentry)))
status = -EISDIR;
}