-/*
- * 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
+ * Copyright (c) 2002 Cluster File Systems, Inc.
*
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
+ * This file is part of Lustre, http://www.lustre.org.
*
- * Copyright (C) 1991, 1992 Linus Torvalds
+ * 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.
*
- * ext2 symlink handling 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.
*
- * Modified for OBDFS:
- * Copyright (C) 1999 Seagate Technology Inc. (author: braam@stelias.com)
+ * 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.
*/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/stat.h>
-#include <linux/locks.h>
-
+#include <linux/smp_lock.h>
+#include <linux/version.h>
#define DEBUG_SUBSYSTEM S_LLITE
-#include <linux/obd_support.h> /* for ENTRY and EXIT only */
-#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 ll_inode_info *lli = ll_i2info(inode);
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ struct ll_fid fid;
+ struct mds_body *body;
+ int rc, symlen = inode->i_size + 1;
+ 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_inode2fid(&fid, inode);
+ rc = mdc_getattr(sbi->ll_mdc_exp, &fid,
+ OBD_MD_LINKNAME, symlen, request);
+ if (rc) {
+ if (rc != -ENOENT)
+ CERROR("inode %lu: rc = %d\n", inode->i_ino, rc);
+ GOTO (failed, rc);
+ }
+
+ body = lustre_msg_buf((*request)->rq_repmsg, REPLY_REC_OFF,
+ sizeof(*body));
+ LASSERT(body != NULL);
+ LASSERT_REPSWABBED(*request, REPLY_REC_OFF);
+
+ 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 = lustre_msg_buf((*request)->rq_repmsg, REPLY_REC_OFF + 1,
+ symlen);
+ 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);
+
+ failed:
+ ptlrpc_req_finished (*request);
+ RETURN (rc);
+}
static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
{
- struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
+ struct inode *inode = dentry->d_inode;
+ struct ll_inode_info *lli = ll_i2info(inode);
struct ptlrpc_request *request;
- char *tmp;
- int rc, size;
+ char *symname;
+ int rc;
ENTRY;
- rc = mdc_getattr(&sbi->ll_mdc_conn, dentry->d_inode->i_ino, S_IFLNK,
- OBD_MD_LINKNAME, dentry->d_inode->i_size, &request);
- if (rc) {
- CERROR("failure %d inode %ld\n", rc,
- (long)dentry->d_inode->i_ino);
- ptlrpc_free_req(request);
- RETURN(rc);
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ /* on symlinks lli_open_sem protects lli_symlink_name allocation/data */
+ down(&lli->lli_open_sem);
+ 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);
+ RETURN(rc);
+}
+
+#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);
+#ifdef LUSTRE_KERNEL_VERSION
+ struct lookup_intent *it = ll_nd2it(nd);
+#endif
+ struct ptlrpc_request *request;
+ int rc;
+ char *symname;
+ ENTRY;
+
+#ifdef LUSTRE_KERNEL_VERSION
+ 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
- tmp = lustre_msg_buf(request->rq_repmsg, 1);
- size = MIN(request->rq_repmsg->buflens[1], buflen);
- rc = copy_to_user(buffer, tmp, size);
- if (rc == 0)
- rc = size;
+ CDEBUG(D_VFSTRACE, "VFS Op\n");
+ down(&lli->lli_open_sem);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ up(&lli->lli_open_sem);
+ if (rc) {
+ path_release(nd); /* Kernel assumes that ->follow_link()
+ releases nameidata on error */
+ GOTO(out, rc);
+ }
- ptlrpc_free_req(request);
+#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_readlink,
- setattr: ll_setattr
+ .readlink = ll_readlink,
+ .setattr = ll_setattr,
+#ifdef LUSTRE_KERNEL_VERSION
+ .setattr_raw = ll_setattr_raw,
+#endif
+ .follow_link = ll_follow_link,
+#ifdef HAVE_COOKIE_FOLLOW_LINK
+ .put_link = ll_put_link,
+#endif
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+ .revalidate_it = ll_inode_revalidate_it,
+#else
+ .getattr = ll_getattr,
+#endif
+ .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