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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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