From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Fri, 9 Jan 2009 21:59:39 +0000 (-0800)
Subject: Add VOP_SEEK
X-Git-Tag: spl-0.4.1~13
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=97735c39e37f1b644ba09755173dd2b3de95ab47;p=spl

Add VOP_SEEK
---

diff --git a/include/sys/vnode.h b/include/sys/vnode.h
index 8b7aefe..7972f65 100644
--- a/include/sys/vnode.h
+++ b/include/sys/vnode.h
@@ -207,6 +207,8 @@ extern int vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len,
 		   offset_t off, uio_seg_t seg, int x1, rlim64_t x2,
 		   void *x3, ssize_t *residp);
 extern int vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4);
+extern int vn_seek(vnode_t *vp, offset_t o, offset_t *op, caller_context_t *ct);
+
 extern int vn_remove(const char *path, uio_seg_t seg, int flags);
 extern int vn_rename(const char *path1, const char *path2, int x1);
 extern int vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4);
@@ -230,6 +232,7 @@ vn_putpage(vnode_t *vp, offset_t off, ssize_t size,
 } /* vn_putpage() */
 
 #define VOP_CLOSE				vn_close
+#define VOP_SEEK				vn_seek
 #define VN_RELE					vn_rele
 #define VOP_GETATTR				vn_getattr
 #define VOP_FSYNC				vn_fsync
diff --git a/modules/spl/spl-vnode.c b/modules/spl/spl-vnode.c
index fef74f3..b19d9f1 100644
--- a/modules/spl/spl-vnode.c
+++ b/modules/spl/spl-vnode.c
@@ -235,19 +235,31 @@ vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4)
 	ASSERT(vp);
 	ASSERT(vp->v_file);
 
-        rc = filp_close(vp->v_file, 0);
-        vn_free(vp);
+	rc = filp_close(vp->v_file, 0);
+	vn_free(vp);
 
 	RETURN(-rc);
 } /* vn_close() */
 EXPORT_SYMBOL(vn_close);
 
-static struct dentry *vn_lookup_hash(struct nameidata *nd)
+/* vn_seek() does not actually seek it only performs bounds checking on the
+ * proposed seek.  We perform minimal checking and allow vn_rdwr() to catch
+ * anything more serious. */
+int
+vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct)
+{
+	return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
+}
+EXPORT_SYMBOL(vn_seek);
+
+static struct dentry *
+vn_lookup_hash(struct nameidata *nd)
 {
 	return lookup_one_len(nd->last.name, nd->nd_dentry, nd->last.len);
 } /* lookup_hash() */
 
-static void vn_path_release(struct nameidata *nd)
+static void
+vn_path_release(struct nameidata *nd)
 {
 	dput(nd->nd_dentry);
 	mntput(nd->nd_mnt);