PERFORCE change 120827 for review

[Roman Divacky]

http://perforce.freebsd.org/chv.cgi?CH=120827

Change 120827 by rdivacky at rdivacky_witten on 2007/06/03 10:48:09

	Implement kern_statat. Not tested at all yet.
	
	Suggested by: rwatson

Affected files ...

.. //depot/projects/soc2007/rdivacky/linux_at/sys/kern/vfs_syscalls.c#5 edit

Differences ...

==== //depot/projects/soc2007/rdivacky/linux_at/sys/kern/vfs_syscalls.c#5 (text+ko) ====

@@ -91,6 +91,8 @@
     int flags, int mode, struct nameidata *nd);
 static int kern_common_access(struct thread *td, char *path, enum uio_seg pathseg, 
     int flags, struct nameidata *nd);
+static int kern_common_stat(struct thread *td, struct stat *sbp,
+    struct nameidata *nd);
 
 /*
  * The module initialization routine for POSIX asynchronous I/O will
@@ -2132,18 +2134,53 @@
 kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp)
 {
 	struct nameidata nd;
-	struct stat sb;
-	int error, vfslocked;
-
+	
 	NDINIT(&nd, LOOKUP,
 	    FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1,
 	    pathseg, path, td);
 	if ((error = namei(&nd)) != 0)
 		return (error);
+
+	return kern_common_stat(td, sbp, nd);
+}
+
+int
+kern_statat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp, int dfd)
+{
+	int error;
+	struct nameidata nd;
+	struct vnode *dir_vn;
+
+	if (dirfd == AT_FDCWD)
+		dir_vn = NULL;
+	else {
+		error = fgetvp(td, dirfd, &dir_vn);
+		if (error)
+			return (error);
+		if (dir_vn->v_type != VDIR) {
+			vrele(dir_vn);
+			return (ENOTDIR);
+		}
+	}
+
+	NDINIT_AT(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | MPSAFE, pathseg, path, td, dir_vn);
+
+	error = kern_common_stat(td, sbp, &nd);
+	if (dirfd != AT_FDCWD)
+		vrele(dir_vn);
+	return (error);
+}
+
+static int
+kern_common_stat(struct thread *td, struct stat *sbp, struct nameidata *nd)
+{
+	struct stat sb;
+	int error, vfslocked;
+
 	vfslocked = NDHASGIANT(&nd);
-	error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td);
+	error = vn_stat(nd->ni_vp, &sb, td->td_ucred, NOCRED, td);
 	NDFREE(&nd, NDF_ONLY_PNBUF);
-	vput(nd.ni_vp);
+	vput(nd->ni_vp);
 	VFS_UNLOCK_GIANT(vfslocked);
 	if (mtx_owned(&Giant))
 		printf("stat(%d): %s\n", vfslocked, path);
@@ -2152,7 +2189,6 @@
 	*sbp = sb;
 	return (0);
 }
-
 /*
  * Get file status; this version does not follow links.
  */