switch follow_down()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

11 files changed, 28 insertions, 32 deletions

diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 2b9e2d03a390..c52be53f6946 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -244,7 +244,7 @@ static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd)
         case -EBUSY:
                 /* someone else made a mount here whilst we were busy */
                 while (d_mountpoint(nd->path.dentry) &&
-                       follow_down(&nd->path.mnt, &nd->path.dentry))
+                       follow_down(&nd->path))
                         ;
                 err = 0;
         default:
diff --git a/fs/autofs/dirhash.c b/fs/autofs/dirhash.c
index 4eb4d8dfb2f1..2316e944a109 100644
--- a/fs/autofs/dirhash.c
+++ b/fs/autofs/dirhash.c
@@ -85,13 +85,12 @@ struct autofs_dir_ent *autofs_expire(struct super_block *sb,
                 }
                 path.mnt = mnt;
                 path_get(&path);
-                if (!follow_down(&path.mnt, &path.dentry)) {
+                if (!follow_down(&path)) {
                         path_put(&path);
                         DPRINTK(("autofs: not expirable (not a mounted directory): %s\n", ent->name));
                         continue;
                 }
-                while (d_mountpoint(path.dentry) &&
-                       follow_down(&path.mnt, &path.dentry))
+                while (d_mountpoint(path.dentry) && follow_down(&path));
                         ;
                 umount_ok = may_umount(path.mnt);
                 path_put(&path);
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index b7ff33c63101..8f7cdde41733 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -223,12 +223,12 @@ int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
 void autofs4_catatonic_mode(struct autofs_sb_info *);
 
-static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **dentry)
+static inline int autofs4_follow_mount(struct path *path)
 {
         int res = 0;
 
-        while (d_mountpoint(*dentry)) {
-                int followed = follow_down(mnt, dentry);
+        while (d_mountpoint(path->dentry)) {
+                int followed = follow_down(path);
                 if (!followed)
                         break;
                 res = 1;
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 670407576b25..f3da2eb51f56 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -562,7 +562,7 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
                 err = have_submounts(path.dentry);
 
                 if (path.mnt->mnt_mountpoint != path.mnt->mnt_root) {
-                        if (follow_down(&path.mnt, &path.dentry))
+                        if (follow_down(&path))
                                 magic = path.mnt->mnt_sb->s_magic;
                 }
         }
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 3077d8f16523..aa39ae83f019 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -48,19 +48,19 @@ static inline int autofs4_can_expire(struct dentry *dentry,
 static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
 {
         struct dentry *top = dentry;
+        struct path path = {.mnt = mnt, .dentry = dentry};
         int status = 1;
 
         DPRINTK("dentry %p %.*s",
                 dentry, (int)dentry->d_name.len, dentry->d_name.name);
 
-        mntget(mnt);
-        dget(dentry);
+        path_get(&path);
 
-        if (!follow_down(&mnt, &dentry))
+        if (!follow_down(&path))
                 goto done;
 
-        if (is_autofs4_dentry(dentry)) {
-                struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+        if (is_autofs4_dentry(path.dentry)) {
+                struct autofs_sb_info *sbi = autofs4_sbi(path.dentry->d_sb);
 
                 /* This is an autofs submount, we can't expire it */
                 if (autofs_type_indirect(sbi->type))
@@ -70,7 +70,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
                  * Otherwise it's an offset mount and we need to check
                  * if we can umount its mount, if there is one.
                  */
-                if (!d_mountpoint(dentry)) {
+                if (!d_mountpoint(path.dentry)) {
                         status = 0;
                         goto done;
                 }
@@ -86,8 +86,7 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
         status = 0;
 done:
         DPRINTK("returning = %d", status);
-        dput(dentry);
-        mntput(mnt);
+        path_put(&path);
         return status;
 }
 
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index e383bf0334f1..b96a3c57359d 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -181,7 +181,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
                 nd->flags);
         /*
          * For an expire of a covered direct or offset mount we need
-         * to beeak out of follow_down() at the autofs mount trigger
+         * to break out of follow_down() at the autofs mount trigger
          * (d_mounted--), so we can see the expiring flag, and manage
          * the blocking and following here until the expire is completed.
          */
@@ -190,7 +190,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
                 if (ino->flags & AUTOFS_INF_EXPIRING) {
                         spin_unlock(&sbi->fs_lock);
                         /* Follow down to our covering mount. */
-                        if (!follow_down(&nd->path.mnt, &nd->path.dentry))
+                        if (!follow_down(&nd->path))
                                 goto done;
                         goto follow;
                 }
@@ -230,8 +230,7 @@ follow:
          * to follow it.
          */
         if (d_mountpoint(dentry)) {
-                if (!autofs4_follow_mount(&nd->path.mnt,
-                                          &nd->path.dentry)) {
+                if (!autofs4_follow_mount(&nd->path)) {
                         status = -ENOENT;
                         goto out_error;
                 }
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 83d62759c7c7..3bb11be8b6a8 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -275,7 +275,7 @@ static int add_mount_helper(struct vfsmount *newmnt, struct nameidata *nd,
         case -EBUSY:
                 /* someone else made a mount here whilst we were busy */
                 while (d_mountpoint(nd->path.dentry) &&
-                       follow_down(&nd->path.mnt, &nd->path.dentry))
+                       follow_down(&nd->path))
                         ;
                 err = 0;
         default:
diff --git a/fs/namei.c b/fs/namei.c
index 8c1f48ae68e7..4d49a3eee6d4 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -731,16 +731,16 @@ static void follow_mount(struct vfsmount **mnt, struct dentry **dentry)
 /* no need for dcache_lock, as serialization is taken care in
  * namespace.c
  */
-int follow_down(struct vfsmount **mnt, struct dentry **dentry)
+int follow_down(struct path *path)
 {
         struct vfsmount *mounted;
 
-        mounted = lookup_mnt(*mnt, *dentry);
+        mounted = lookup_mnt(path->mnt, path->dentry);
         if (mounted) {
-                dput(*dentry);
-                mntput(*mnt);
-                *mnt = mounted;
-                *dentry = dget(mounted->mnt_root);
+                dput(path->dentry);
+                mntput(path->mnt);
+                path->mnt = mounted;
+                path->dentry = dget(mounted->mnt_root);
                 return 1;
         }
         return 0;
diff --git a/fs/namespace.c b/fs/namespace.c
index c85962206aad..ba5237be1cf9 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1601,7 +1601,7 @@ static int do_move_mount(struct path *path, char *old_name)
 
         down_write(&namespace_sem);
         while (d_mountpoint(path->dentry) &&
-               follow_down(&path->mnt, &path->dentry))
+               follow_down(path))
                 ;
         err = -EINVAL;
         if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
@@ -1695,7 +1695,7 @@ int do_add_mount(struct vfsmount *newmnt, struct path *path,
         down_write(&namespace_sem);
         /* Something was mounted here while we slept */
         while (d_mountpoint(path->dentry) &&
-               follow_down(&path->mnt, &path->dentry))
+               follow_down(path))
                 ;
         err = -EINVAL;
         if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(path->mnt))
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 64a288ee046d..f01caec84463 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -154,7 +154,7 @@ out_err:
         goto out;
 out_follow:
         while (d_mountpoint(nd->path.dentry) &&
-               follow_down(&nd->path.mnt, &nd->path.dentry))
+               follow_down(&nd->path))
                 ;
         err = 0;
         goto out;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 7b2b3f775326..99f835753596 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -105,8 +105,7 @@ nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
                             .dentry = dget(dentry)};
         int err = 0;
 
-        while (follow_down(&path.mnt, &path.dentry) &&
-               d_mountpoint(path.dentry))
+        while (d_mountpoint(path.dentry) && follow_down(&path))
                 ;
 
         exp2 = rqst_exp_get_by_name(rqstp, &path);