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Subject[PATCH 1/1] fs: add 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 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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