From: Erez_Zadok <ezk@cs.sunysb.edu>
Date: Sun, 29 Apr 2007 23:33:25 +0000 (-0400)
Subject: fsstack: 4th case to do_path_lookup
X-Git-Tag: unionfs-2.1.1~140
X-Git-Url: https://git.fsl.cs.stonybrook.edu/?a=commitdiff_plain;h=72e4e8cbe4343b120d8d9dac56a12f27a691df5a;p=unionfs-2.6.26.y.git

fsstack: 4th case to do_path_lookup

Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu>
---

diff --git a/fs/namei.c b/fs/namei.c
index db845e8856a..f446600524c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1155,6 +1155,10 @@ static int do_path_lookup(int dfd, const char *name,
 		nd->path = fs->root;
 		path_get(&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->path = fs->pwd;
diff --git a/include/linux/namei.h b/include/linux/namei.h
index a83bd12cfa2..abf0f1a8690 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -42,6 +42,7 @@ 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
@@ -49,6 +50,7 @@ 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
  */