-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
+/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see [sun.com URL with a
- * copy of GPLv2].
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* GPL HEADER END
*/
/*
- * Copyright 2008 Sun Microsystems, Inc. All rights reserved
+ * 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/
struct ll_sb_info *sbi = ll_i2sbi(inode);
int rc, symlen = i_size_read(inode) + 1;
struct mdt_body *body;
- struct obd_capa *oc;
+ 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);
- }
-
- 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 (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);
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",
/* 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);
- failed:
- ptlrpc_req_finished (*request);
+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_size_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_size_sem);
+ ptlrpc_req_finished(request);
+ ll_inode_size_unlock(inode, 0);
RETURN(rc);
}
struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
- struct ll_inode_info *lli = ll_i2info(inode);
-#ifdef HAVE_VFS_INTENT_PATCHES
- struct lookup_intent *it = ll_nd2it(nd);
-#endif
- struct ptlrpc_request *request;
+ 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");
- down(&lli->lli_size_sem);
- rc = ll_readlink_internal(inode, &request, &symname);
- up(&lli->lli_size_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);
}
-#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) {
+ 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);
+ 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
struct inode_operations ll_fast_symlink_inode_operations = {
.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,
git://git.whamcloud.com / fs / lustre-release.git / blobdiff