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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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