autofs: change autofs4_wait() to take struct path

In order to use the functions path_is_mountpoint() and path_has_submounts()
autofs needs to pass a struct path in several places.

Now change autofs4_wait() to take a struct path instead of a struct
dentry.

Link: http://lkml.kernel.org/r/20161011053413.27645.84666.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>

4 files changed, 15 insertions, 12 deletions

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 45311525ad89..c885daae68c8 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -217,7 +217,8 @@ static inline int autofs_prepare_pipe(struct file *pipe)
 
 /* Queue management functions */
 
-int autofs4_wait(struct autofs_sb_info *, struct dentry *, enum autofs_notify);
+int autofs4_wait(struct autofs_sb_info *,
+                 const struct path *, enum autofs_notify);
 int autofs4_wait_release(struct autofs_sb_info *, autofs_wqt_t, int);
 void autofs4_catatonic_mode(struct autofs_sb_info *);
 
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 6ba6107e6102..9c352da24444 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -526,7 +526,7 @@ retry:
 
                 pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);
 
-                status = autofs4_wait(sbi, dentry, NFY_NONE);
+                status = autofs4_wait(sbi, path, NFY_NONE);
                 wait_for_completion(&ino->expire_complete);
 
                 pr_debug("expire done status=%d\n", status);
@@ -593,11 +593,12 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
 
         if (dentry) {
                 struct autofs_info *ino = autofs4_dentry_ino(dentry);
+                struct path path = { .mnt = mnt, .dentry = dentry };
 
                 /* This is synchronous because it makes the daemon a
                  * little easier
                  */
-                ret = autofs4_wait(sbi, dentry, NFY_EXPIRE);
+                ret = autofs4_wait(sbi, &path, NFY_EXPIRE);
 
                 spin_lock(&sbi->fs_lock);
                 /* avoid rapid-fire expire attempts if expiry fails */
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 6b06337ca9fc..0e9881552881 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -269,17 +269,17 @@ next:
         return NULL;
 }
 
-static int autofs4_mount_wait(struct dentry *dentry, bool rcu_walk)
+static int autofs4_mount_wait(const struct path *path, bool rcu_walk)
 {
-        struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
-        struct autofs_info *ino = autofs4_dentry_ino(dentry);
+        struct autofs_sb_info *sbi = autofs4_sbi(path->dentry->d_sb);
+        struct autofs_info *ino = autofs4_dentry_ino(path->dentry);
         int status = 0;
 
         if (ino->flags & AUTOFS_INF_PENDING) {
                 if (rcu_walk)
                         return -ECHILD;
-                pr_debug("waiting for mount name=%pd\n", dentry);
-                status = autofs4_wait(sbi, dentry, NFY_MOUNT);
+                pr_debug("waiting for mount name=%pd\n", path->dentry);
+                status = autofs4_wait(sbi, path, NFY_MOUNT);
                 pr_debug("mount wait done status=%d\n", status);
         }
         ino->last_used = jiffies;
@@ -364,7 +364,7 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
         spin_lock(&sbi->fs_lock);
         if (ino->flags & AUTOFS_INF_PENDING) {
                 spin_unlock(&sbi->fs_lock);
-                status = autofs4_mount_wait(dentry, 0);
+                status = autofs4_mount_wait(path, 0);
                 if (status)
                         return ERR_PTR(status);
                 goto done;
@@ -405,7 +405,7 @@ static struct vfsmount *autofs4_d_automount(struct path *path)
                 }
                 ino->flags |= AUTOFS_INF_PENDING;
                 spin_unlock(&sbi->fs_lock);
-                status = autofs4_mount_wait(dentry, 0);
+                status = autofs4_mount_wait(path, 0);
                 spin_lock(&sbi->fs_lock);
                 ino->flags &= ~AUTOFS_INF_PENDING;
                 if (status) {
@@ -447,7 +447,7 @@ static int autofs4_d_manage(const struct path *path, bool rcu_walk)
          * This dentry may be under construction so wait on mount
          * completion.
          */
-        status = autofs4_mount_wait(dentry, rcu_walk);
+        status = autofs4_mount_wait(path, rcu_walk);
         if (status)
                 return status;
 
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index e44271dfceb6..38ef973f80e9 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -345,8 +345,9 @@ static int validate_request(struct autofs_wait_queue **wait,
 }
 
 int autofs4_wait(struct autofs_sb_info *sbi,
-                 struct dentry *dentry, enum autofs_notify notify)
+                 const struct path *path, enum autofs_notify notify)
 {
+        struct dentry *dentry = path->dentry;
         struct autofs_wait_queue *wq;
         struct qstr qstr;
         char *name;