-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * GPL HEADER START
*
- * Copyright (c) 2002 Cluster File Systems, Inc.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
- * This file is part of Lustre, http://www.lustre.org.
+ * 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.
*
- * Lustre is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
+ * 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).
*
- * Lustre 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 for more details.
+ * 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
*
- * You should have received a copy of the GNU General Public License
- * along with Lustre; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, Whamcloud, Inc.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
*/
#include <linux/fs.h>
#include <linux/version.h>
#define DEBUG_SUBSYSTEM S_LLITE
-#include <linux/lustre_lite.h>
+#include <lustre_lite.h>
#include "llite_internal.h"
static int ll_readlink_internal(struct inode *inode,
- struct ptlrpc_request **request,
- char **symname)
+ struct ptlrpc_request **request, char **symname)
{
struct ll_inode_info *lli = ll_i2info(inode);
struct ll_sb_info *sbi = ll_i2sbi(inode);
- struct lustre_id id;
- struct mds_body *body;
- int rc, symlen = inode->i_size + 1;
+ int rc, symlen = i_size_read(inode) + 1;
+ struct mdt_body *body;
+ struct md_op_data *op_data;
ENTRY;
*request = NULL;
- if (lli->lli_symlink_name) {
- *symname = lli->lli_symlink_name;
- CDEBUG(D_INODE, "using cached symlink %s\n", *symname);
- RETURN(0);
- }
-
- ll_inode2id(&id, inode);
- rc = md_getattr(sbi->ll_md_exp, &id, OBD_MD_LINKNAME, NULL, NULL, 0,
- symlen, NULL, request);
-
+ if (lli->lli_symlink_name) {
+ int print_limit = min_t(int, PAGE_SIZE - 128, symlen);
+
+ *symname = lli->lli_symlink_name;
+ /* If the total CDEBUG() size is larger than a page, it
+ * will print a warning to the console, avoid this by
+ * printing just the last part of the symlink. */
+ CDEBUG(D_INODE, "using cached symlink %s%.*s, len = %d\n",
+ print_limit < symlen ? "..." : "", print_limit,
+ (*symname) + symlen - print_limit, symlen);
+ RETURN(0);
+ }
+
+ op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, symlen,
+ LUSTRE_OPC_ANY, NULL);
+ if (IS_ERR(op_data))
+ RETURN(PTR_ERR(op_data));
+
+ op_data->op_valid = OBD_MD_LINKNAME;
+ rc = md_getattr(sbi->ll_md_exp, op_data, request);
+ ll_finish_md_op_data(op_data);
if (rc) {
if (rc != -ENOENT)
CERROR("inode %lu: rc = %d\n", inode->i_ino, rc);
- GOTO(failed, rc);
+ GOTO (failed, rc);
}
- body = lustre_msg_buf ((*request)->rq_repmsg, 0, sizeof (*body));
- LASSERT (body != NULL);
- LASSERT_REPSWABBED (*request, 0);
-
+ 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);
+ CERROR("OBD_MD_LINKNAME not set on reply\n");
+ GOTO(failed, rc = -EPROTO);
}
-
- LASSERT (symlen != 0);
+
+ LASSERT(symlen != 0);
if (body->eadatasize != symlen) {
- CERROR ("inode %lu: symlink length %d not expected %d\n",
+ CERROR("inode %lu: symlink length %d not expected %d\n",
inode->i_ino, body->eadatasize - 1, symlen - 1);
- GOTO (failed, rc = -EPROTO);
+ GOTO(failed, rc = -EPROTO);
}
- *symname = lustre_msg_buf ((*request)->rq_repmsg, 1, symlen);
+ *symname = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_MD);
if (*symname == NULL ||
- strnlen (*symname, symlen) != symlen - 1) {
+ strnlen(*symname, symlen) != symlen - 1) {
/* not full/NULL terminated */
- CERROR ("inode %lu: symlink not NULL terminated string"
+ CERROR("inode %lu: symlink not NULL terminated string"
"of length %d\n", inode->i_ino, symlen - 1);
- GOTO (failed, rc = -EPROTO);
+ 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)
+ if (lli->lli_symlink_name) {
memcpy(lli->lli_symlink_name, *symname, symlen);
-
+ *symname = lli->lli_symlink_name;
+ }
RETURN(0);
- failed:
- ptlrpc_req_finished (*request);
- RETURN(rc);
+failed:
+ RETURN (rc);
}
static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
- struct ll_inode_info *lli = ll_i2info(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 */
- down(&lli->lli_open_sem);
+
+ 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:
- up(&lli->lli_open_sem);
+ ptlrpc_req_finished(request);
+ ll_inode_size_unlock(inode, 0);
RETURN(rc);
}
-static int ll_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)
{
struct inode *inode = dentry->d_inode;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct lookup_intent *it = ll_nd2it(nd);
- struct ptlrpc_request *request;
+ struct ptlrpc_request *request = NULL;
int rc;
char *symname;
ENTRY;
- 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;
- }
-
CDEBUG(D_VFSTRACE, "VFS Op\n");
- down(&lli->lli_open_sem);
- rc = ll_readlink_internal(inode, &request, &symname);
- up(&lli->lli_open_sem);
+ /* Limit the recursive symlink depth to 5 instead of default
+ * 8 links when kernel has 4k stack to prevent stack overflow.
+ * For 8k stacks we need to limit it to 7 for local servers. */
+ if (THREAD_SIZE < 8192 && current->link_count >= 6) {
+ rc = -ELOOP;
+ } else if (THREAD_SIZE == 8192 && current->link_count >= 8) {
+ 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()
+ cfs_path_put(nd); /* Kernel assumes that ->follow_link()
releases nameidata on error */
GOTO(out, rc);
}
- rc = vfs_follow_link(nd, symname);
+#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 (lli->lli_symlink_name == 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
+out:
ptlrpc_req_finished(request);
- out:
+#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
struct inode_operations ll_fast_symlink_inode_operations = {
.readlink = ll_readlink,
.setattr = ll_setattr,
.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,
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- .revalidate_it = ll_inode_revalidate_it
-#else
- .getattr = ll_getattr
-#endif
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff