[PATCH 1/1] fs: add 4th case to do_path_lookup

[Josef Sipek]

Signed-off-by: Josef 'Jeff' Sipek <jsipek@xxxxxxxxxxxxx>

diff --git a/fs/namei.c b/fs/namei.c
index 2995fba..1516a9b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1125,6 +1125,10 @@ static int fastcall do_path_lookup(int dfd, const char *name,
 		nd->mnt = mntget(fs->rootmnt);
 		nd->dentry = dget(fs->root);
 		read_unlock(&fs->lock);
+	} else if (flags & LOOKUP_ONE) {
+		/* nd->mnt and nd->dentry already set, just grab references */
+		mntget(nd->mnt);
+		dget(nd->dentry);
 	} else if (dfd == AT_FDCWD) {
 		read_lock(&fs->lock);
 		nd->mnt = mntget(fs->pwdmnt);
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 92b422b..aa89d97 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -48,6 +48,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
  *  - internal "there are more path compnents" flag
  *  - locked when lookup done with dcache_lock held
  *  - dentry cache is untrusted; force a real lookup
+ *  - lookup path from given dentry/vfsmount pair
  */
 #define LOOKUP_FOLLOW		 1
 #define LOOKUP_DIRECTORY	 2
@@ -55,6 +56,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
 #define LOOKUP_PARENT		16
 #define LOOKUP_NOALT		32
 #define LOOKUP_REVAL		64
+#define LOOKUP_ONE	       128
 /*
  * Intent data
  */
-
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