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SubjectRe: [PATCH 1/1] fs: add 4th case to do_path_lookup
On Sun, 29 Apr 2007 23:30:12 -0400 Josef Sipek <jsipek@cs.sunysb.edu> wrote:

> 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

Well the patch passes my too-small-to-care-about test ;)

Unless someone objects I'd suggest that you add it to the unionfs tree.
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