1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/stat.h>
25 #include <linux/smp_lock.h>
26 #include <linux/version.h>
27 #define DEBUG_SUBSYSTEM S_LLITE
29 #include <lustre_lite.h>
30 #include "llite_internal.h"
32 static int ll_readlink_internal(struct inode *inode,
33 struct ptlrpc_request **request, char **symname)
35 struct ll_inode_info *lli = ll_i2info(inode);
36 struct ll_sb_info *sbi = ll_i2sbi(inode);
38 struct mds_body *body;
39 int rc, symlen = inode->i_size + 1;
44 if (lli->lli_symlink_name) {
45 *symname = lli->lli_symlink_name;
46 CDEBUG(D_INODE, "using cached symlink %s\n", *symname);
50 ll_inode2fid(&fid, inode);
51 rc = mdc_getattr(sbi->ll_mdc_exp, &fid,
52 OBD_MD_LINKNAME, symlen, request);
55 CERROR("inode %lu: rc = %d\n", inode->i_ino, rc);
59 body = lustre_msg_buf((*request)->rq_repmsg, REPLY_REC_OFF,
61 LASSERT(body != NULL);
62 LASSERT_REPSWABBED(*request, REPLY_REC_OFF);
64 if ((body->valid & OBD_MD_LINKNAME) == 0) {
65 CERROR("OBD_MD_LINKNAME not set on reply\n");
66 GOTO(failed, rc = -EPROTO);
70 if (body->eadatasize != symlen) {
71 CERROR("inode %lu: symlink length %d not expected %d\n",
72 inode->i_ino, body->eadatasize - 1, symlen - 1);
73 GOTO(failed, rc = -EPROTO);
76 *symname = lustre_msg_buf((*request)->rq_repmsg, REPLY_REC_OFF + 1,
78 if (*symname == NULL ||
79 strnlen (*symname, symlen) != symlen - 1) {
80 /* not full/NULL terminated */
81 CERROR("inode %lu: symlink not NULL terminated string"
82 "of length %d\n", inode->i_ino, symlen - 1);
83 GOTO(failed, rc = -EPROTO);
86 OBD_ALLOC(lli->lli_symlink_name, symlen);
87 /* do not return an error if we cannot cache the symlink locally */
88 if (lli->lli_symlink_name) {
89 memcpy(lli->lli_symlink_name, *symname, symlen);
90 ptlrpc_req_finished (*request);
92 *symname = lli->lli_symlink_name;
98 ptlrpc_req_finished (*request);
102 static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
104 struct inode *inode = dentry->d_inode;
105 struct ll_inode_info *lli = ll_i2info(inode);
106 struct ptlrpc_request *request;
111 CDEBUG(D_VFSTRACE, "VFS Op\n");
112 /* on symlinks lli_open_sem protects lli_symlink_name allocation/data */
113 down(&lli->lli_size_sem);
114 rc = ll_readlink_internal(inode, &request, &symname);
118 rc = vfs_readlink(dentry, buffer, buflen, symname);
119 ptlrpc_req_finished(request);
121 up(&lli->lli_size_sem);
125 #ifdef HAVE_COOKIE_FOLLOW_LINK
126 # define LL_FOLLOW_LINK_RETURN_TYPE void *
128 # define LL_FOLLOW_LINK_RETURN_TYPE int
131 static LL_FOLLOW_LINK_RETURN_TYPE ll_follow_link(struct dentry *dentry, struct nameidata *nd)
133 struct inode *inode = dentry->d_inode;
134 struct ll_inode_info *lli = ll_i2info(inode);
135 #ifdef LUSTRE_KERNEL_VERSION
136 struct lookup_intent *it = ll_nd2it(nd);
138 struct ptlrpc_request *request;
143 #ifdef LUSTRE_KERNEL_VERSION
146 int mode = it->it_create_mode;
148 ll_intent_release(it);
150 it->it_create_mode = mode;
154 CDEBUG(D_VFSTRACE, "VFS Op\n");
155 down(&lli->lli_size_sem);
156 rc = ll_readlink_internal(inode, &request, &symname);
157 up(&lli->lli_size_sem);
159 path_release(nd); /* Kernel assumes that ->follow_link()
160 releases nameidata on error */
164 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,8))
165 rc = vfs_follow_link(nd, symname);
167 # ifdef HAVE_COOKIE_FOLLOW_LINK
168 nd_set_link(nd, symname);
169 /* @symname may contain a pointer to the request message buffer,
170 we delay request releasing until ll_put_link then. */
173 if (request != NULL) {
174 /* falling back to recursive follow link if the request
175 * needs to be cleaned up still. */
176 rc = vfs_follow_link(nd, symname);
179 nd_set_link(nd, symname);
184 ptlrpc_req_finished(request);
185 #ifdef HAVE_COOKIE_FOLLOW_LINK
192 #ifdef HAVE_COOKIE_FOLLOW_LINK
193 static void ll_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
195 ptlrpc_req_finished(cookie);
199 struct inode_operations ll_fast_symlink_inode_operations = {
200 .readlink = ll_readlink,
201 .setattr = ll_setattr,
202 #ifdef LUSTRE_KERNEL_VERSION
203 .setattr_raw = ll_setattr_raw,
205 .follow_link = ll_follow_link,
206 #ifdef HAVE_COOKIE_FOLLOW_LINK
207 .put_link = ll_put_link,
209 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
210 .revalidate_it = ll_inode_revalidate_it,
212 .getattr = ll_getattr,
214 .permission = ll_inode_permission,
215 .setxattr = ll_setxattr,
216 .getxattr = ll_getxattr,
217 .listxattr = ll_listxattr,
218 .removexattr = ll_removexattr,