-/*
- * linux/fs/ext2/symlink.c
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
*
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
+ * GPL HEADER START
*
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * from
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
*
- * linux/fs/minix/symlink.c
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
*
- * Copyright (C) 1991, 1992 Linus Torvalds
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
- * ext2 symlink handling code
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
*
- * Modified for OBDFS:
- * Copyright (C) 1999 Seagate Technology Inc. (author: braam@stelias.com)
+ * GPL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/stat.h>
-#include <linux/locks.h>
-#include <linux/obd_support.h> /* for ENTRY and EXIT only */
-#include <linux/lustre_light.h>
+#include <linux/smp_lock.h>
+#include <linux/version.h>
+#define DEBUG_SUBSYSTEM S_LLITE
+
+#include <lustre_lite.h>
+#include "llite_internal.h"
+
+static int ll_readlink_internal(struct inode *inode,
+ struct ptlrpc_request **request, char **symname)
+{
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ int rc, symlen = i_size_read(inode) + 1;
+ struct mdt_body *body;
+ struct obd_capa *oc;
+ ENTRY;
+
+ *request = NULL;
+
+ if (lli->lli_symlink_name) {
+ *symname = lli->lli_symlink_name;
+ CDEBUG(D_INODE, "using cached symlink %s\n", *symname);
+ RETURN(0);
+ }
+
+ oc = ll_mdscapa_get(inode);
+ rc = md_getattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
+ OBD_MD_LINKNAME, symlen, request);
+ capa_put(oc);
+ if (rc) {
+ if (rc != -ENOENT)
+ CERROR("inode %lu: rc = %d\n", inode->i_ino, rc);
+ GOTO (failed, rc);
+ }
+
+ body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
+ LASSERT(body != NULL);
+ if ((body->valid & OBD_MD_LINKNAME) == 0) {
+ CERROR("OBD_MD_LINKNAME not set on reply\n");
+ GOTO(failed, rc = -EPROTO);
+ }
+
+ LASSERT(symlen != 0);
+ if (body->eadatasize != symlen) {
+ CERROR("inode %lu: symlink length %d not expected %d\n",
+ inode->i_ino, body->eadatasize - 1, symlen - 1);
+ GOTO(failed, rc = -EPROTO);
+ }
+
+ *symname = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_MD);
+ if (*symname == NULL ||
+ strnlen(*symname, symlen) != symlen - 1) {
+ /* not full/NULL terminated */
+ CERROR("inode %lu: symlink not NULL terminated string"
+ "of length %d\n", inode->i_ino, symlen - 1);
+ GOTO(failed, rc = -EPROTO);
+ }
+ OBD_ALLOC(lli->lli_symlink_name, symlen);
+ /* do not return an error if we cannot cache the symlink locally */
+ if (lli->lli_symlink_name) {
+ memcpy(lli->lli_symlink_name, *symname, symlen);
+ ptlrpc_req_finished (*request);
+ *request = NULL;
+ *symname = lli->lli_symlink_name;
+ }
+ RETURN(0);
-static int ll_fast_readlink(struct dentry *dentry, char *buffer, int buflen)
+ failed:
+ ptlrpc_req_finished (*request);
+ RETURN (rc);
+}
+
+static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
{
- char *s = ll_i2info(dentry->d_inode)->lli_inline;
- return vfs_readlink(dentry, buffer, buflen, s);
+ struct inode *inode = dentry->d_inode;
+ struct ptlrpc_request *request;
+ char *symname;
+ int rc;
+ ENTRY;
+
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ /* on symlinks lli_open_sem protects lli_symlink_name allocation/data */
+ ll_inode_size_lock(inode, 0);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ if (rc)
+ GOTO(out, rc);
+
+ rc = vfs_readlink(dentry, buffer, buflen, symname);
+ ptlrpc_req_finished(request);
+ out:
+ ll_inode_size_unlock(inode, 0);
+ RETURN(rc);
}
-static int ll_fast_follow_link(struct dentry *dentry, struct nameidata *nd)
+#ifdef HAVE_COOKIE_FOLLOW_LINK
+# define LL_FOLLOW_LINK_RETURN_TYPE void *
+#else
+# define LL_FOLLOW_LINK_RETURN_TYPE int
+#endif
+
+static LL_FOLLOW_LINK_RETURN_TYPE ll_follow_link(struct dentry *dentry,
+ struct nameidata *nd)
{
- char *s = ll_i2info(dentry->d_inode)->lli_inline;
- return vfs_follow_link(nd, s);
+ struct inode *inode = dentry->d_inode;
+#ifdef HAVE_VFS_INTENT_PATCHES
+ struct lookup_intent *it = ll_nd2it(nd);
+#endif
+ struct ptlrpc_request *request = NULL;
+ int rc;
+ char *symname;
+ ENTRY;
+
+#ifdef HAVE_VFS_INTENT_PATCHES
+ if (it != NULL) {
+ int op = it->it_op;
+ int mode = it->it_create_mode;
+
+ ll_intent_release(it);
+ it->it_op = op;
+ it->it_create_mode = mode;
+ }
+#endif
+
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ /* Limit the recursive symlink depth to 5 instead of default
+ * 8 links when kernel has 4k stack to prevent stack overflow. */
+ if (THREAD_SIZE < 8192 && current->link_count >= 5) {
+ rc = -ELOOP;
+ } else {
+ ll_inode_size_lock(inode, 0);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ ll_inode_size_unlock(inode, 0);
+ }
+ if (rc) {
+ path_release(nd); /* Kernel assumes that ->follow_link()
+ releases nameidata on error */
+ GOTO(out, rc);
+ }
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,8))
+ rc = vfs_follow_link(nd, symname);
+#else
+#ifdef HAVE_COOKIE_FOLLOW_LINK
+ nd_set_link(nd, symname);
+ /* @symname may contain a pointer to the request message buffer,
+ we delay request releasing until ll_put_link then. */
+ RETURN(request);
+#else
+ if (request != NULL) {
+ /* falling back to recursive follow link if the request
+ * needs to be cleaned up still. */
+ rc = vfs_follow_link(nd, symname);
+ GOTO(out, rc);
+ }
+ nd_set_link(nd, symname);
+ RETURN(0);
+#endif
+#endif
+out:
+ ptlrpc_req_finished(request);
+#ifdef HAVE_COOKIE_FOLLOW_LINK
+ RETURN(ERR_PTR(rc));
+#else
+ RETURN(rc);
+#endif
+}
+
+#ifdef HAVE_COOKIE_FOLLOW_LINK
+static void ll_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
+{
+ ptlrpc_req_finished(cookie);
}
+#endif
-extern int ll_setattr(struct dentry *de, struct iattr *attr);
struct inode_operations ll_fast_symlink_inode_operations = {
- readlink: ll_fast_readlink,
- follow_link: ll_fast_follow_link,
- setattr: ll_setattr
+ .readlink = ll_readlink,
+ .setattr = ll_setattr,
+#ifdef HAVE_VFS_INTENT_PATCHES
+ .setattr_raw = ll_setattr_raw,
+#endif
+ .follow_link = ll_follow_link,
+#ifdef HAVE_COOKIE_FOLLOW_LINK
+ .put_link = ll_put_link,
+#endif
+ .getattr = ll_getattr,
+ .permission = ll_inode_permission,
+ .setxattr = ll_setxattr,
+ .getxattr = ll_getxattr,
+ .listxattr = ll_listxattr,
+ .removexattr = ll_removexattr,
};
-
git://git.whamcloud.com / fs / lustre-release.git / blobdiff