-/*
- * 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.
*
- * from
+ * 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.
*
- * linux/fs/minix/symlink.c
+ * 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.
*
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * ext2 symlink handling code
- *
- * 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/obd_support.h> /* for ENTRY and EXIT only */
-#include <linux/obdfs.h>
+#define DEBUG_SUBSYSTEM S_LLITE
-static int obdfs_fast_readlink(struct dentry *dentry, char *buffer, int buflen)
-{
- char *s = obdfs_i2info(dentry->d_inode)->oi_inline;
- return vfs_readlink(dentry, buffer, buflen, s);
-}
+#include <linux/lustre_lite.h>
-static int obdfs_fast_follow_link(struct dentry *dentry, struct nameidata *nd)
+static int ll_readlink_internal(struct inode *inode,
+ struct ptlrpc_request **request, char **symname)
{
- char *s = obdfs_i2info(dentry->d_inode)->oi_inline;
- return vfs_follow_link(nd, s);
-}
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ int rc, len = inode->i_size + 1;
+ ENTRY;
-extern int obdfs_setattr(struct dentry *de, struct iattr *attr);
-struct inode_operations obdfs_fast_symlink_inode_operations = {
- readlink: obdfs_fast_readlink,
- follow_link: obdfs_fast_follow_link,
- setattr: obdfs_setattr
-};
+ *request = NULL;
-static int obdfs_readlink(struct dentry *dentry, char *buffer, int buflen)
-{
- struct page *page = NULL;
- int res;
+ CHECK_MOUNT_EPOCH(inode);
- ENTRY;
- OIDEBUG(dentry->d_inode);
- page = obdfs_getpage(dentry->d_inode, 0, 0, 0);
- /* PDEBUG(page, "readlink"); */
- if (!page) {
- EXIT;
- return 0;
+ if (lli->lli_symlink_name) {
+ *symname = lli->lli_symlink_name;
+ CDEBUG(D_INODE, "using cached symlink %s\n", *symname);
+ RETURN(0);
+ }
+
+ rc = mdc_getattr(&sbi->ll_mdc_conn, inode->i_ino, S_IFLNK,
+ OBD_MD_LINKNAME, len, request);
+ if (rc) {
+ CERROR("inode "LPD64": rc = %d\n", inode->i_ino, rc);
+ RETURN(rc);
}
- res = vfs_readlink(dentry, buffer, buflen, (char *)page_address(page));
- page_cache_release(page);
- EXIT;
- return res;
-} /* obdfs_readlink */
-
-static int obdfs_follow_link(struct dentry * dentry,
- struct nameidata *nd)
+
+ *symname = lustre_msg_buf((*request)->rq_repmsg, 1);
+
+ OBD_ALLOC(lli->lli_symlink_name, len);
+ /* do not return an error if we cannot cache the symlink locally */
+ if (lli->lli_symlink_name)
+ memcpy(lli->lli_symlink_name, *symname, len);
+
+ RETURN(0);
+}
+
+static int ll_readlink(struct dentry *dentry, char *buffer, int buflen)
{
- struct page *page = NULL;
- int res;
+ struct inode *inode = dentry->d_inode;
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct ptlrpc_request *request;
+ char *symname;
+ int rc;
+ ENTRY;
+
+ CHECK_MOUNT_EPOCH(inode);
+
+ /* 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);
+ out:
+ up(&lli->lli_open_sem);
+ ptlrpc_free_req(request);
+
+ RETURN(rc);
+}
+static int ll_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct inode *inode = dentry->d_inode;
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct ptlrpc_request *request;
+ char *symname;
+ int rc;
ENTRY;
- OIDEBUG(dentry->d_inode);
- page = obdfs_getpage(dentry->d_inode, 0, 0, 0);
- /* PDEBUG(page, "follow_link"); */
- if (!page) {
- dput(nd->dentry);
- EXIT;
- return -EIO;
- }
- res = vfs_follow_link(nd, (char *)page_address(page));
- page_cache_release(page);
- EXIT;
- return res;
+
+ CHECK_MOUNT_EPOCH(inode);
+
+ down(&lli->lli_open_sem);
+ rc = ll_readlink_internal(inode, &request, &symname);
+ if (rc)
+ GOTO(out, rc);
+
+ rc = vfs_follow_link(nd, symname);
+ out:
+ up(&lli->lli_open_sem);
+ ptlrpc_free_req(request);
+
+ RETURN(rc);
}
-struct inode_operations obdfs_symlink_inode_operations = {
- readlink: obdfs_readlink,
- follow_link: obdfs_follow_link,
- setattr: obdfs_setattr
+extern int ll_setattr(struct dentry *de, struct iattr *attr);
+struct inode_operations ll_fast_symlink_inode_operations = {
+ readlink: ll_readlink,
+ setattr: ll_setattr,
+ follow_link: ll_follow_link
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff