178 lines
4.0 KiB
C
178 lines
4.0 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* linux/cluster/ssi/cfs/symlink.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
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* or NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* Optimization changes Copyright (C) 1994 Florian La Roche
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*
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* Jun 7 1999, cache symlink lookups in the page cache. -DaveM
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*
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* Portions Copyright (C) 2001 Compaq Computer Corporation
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*
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* ocfs2 symlink handling code.
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*
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* Copyright (C) 2004, 2005 Oracle.
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*
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/utsname.h>
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#define MLOG_MASK_PREFIX ML_NAMEI
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "file.h"
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#include "inode.h"
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#include "journal.h"
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#include "symlink.h"
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#include "buffer_head_io.h"
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static char *ocfs2_page_getlink(struct dentry * dentry,
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struct page **ppage);
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static char *ocfs2_fast_symlink_getlink(struct inode *inode,
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struct buffer_head **bh);
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/* get the link contents into pagecache */
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static char *ocfs2_page_getlink(struct dentry * dentry,
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struct page **ppage)
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{
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struct page * page;
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struct address_space *mapping = dentry->d_inode->i_mapping;
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page = read_mapping_page(mapping, 0, NULL);
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if (IS_ERR(page))
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goto sync_fail;
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*ppage = page;
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return kmap(page);
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sync_fail:
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return (char*)page;
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}
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static char *ocfs2_fast_symlink_getlink(struct inode *inode,
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struct buffer_head **bh)
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{
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int status;
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char *link = NULL;
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struct ocfs2_dinode *fe;
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mlog_entry_void();
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status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
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OCFS2_I(inode)->ip_blkno,
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bh,
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OCFS2_BH_CACHED,
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inode);
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if (status < 0) {
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mlog_errno(status);
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link = ERR_PTR(status);
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goto bail;
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}
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fe = (struct ocfs2_dinode *) (*bh)->b_data;
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link = (char *) fe->id2.i_symlink;
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bail:
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mlog_exit(status);
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return link;
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}
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static int ocfs2_readlink(struct dentry *dentry,
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char __user *buffer,
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int buflen)
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{
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int ret;
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char *link;
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struct buffer_head *bh = NULL;
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struct inode *inode = dentry->d_inode;
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mlog_entry_void();
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link = ocfs2_fast_symlink_getlink(inode, &bh);
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if (IS_ERR(link)) {
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ret = PTR_ERR(link);
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goto out;
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}
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/*
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* Without vfsmount we can't update atime now,
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* but we will update atime here ultimately.
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*/
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ret = vfs_readlink(dentry, buffer, buflen, link);
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brelse(bh);
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out:
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mlog_exit(ret);
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return ret;
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}
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static void *ocfs2_follow_link(struct dentry *dentry,
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struct nameidata *nd)
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{
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int status;
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char *link;
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struct inode *inode = dentry->d_inode;
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struct page *page = NULL;
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struct buffer_head *bh = NULL;
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if (ocfs2_inode_is_fast_symlink(inode))
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link = ocfs2_fast_symlink_getlink(inode, &bh);
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else
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link = ocfs2_page_getlink(dentry, &page);
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if (IS_ERR(link)) {
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status = PTR_ERR(link);
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mlog_errno(status);
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goto bail;
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}
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status = vfs_follow_link(nd, link);
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bail:
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if (page) {
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kunmap(page);
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page_cache_release(page);
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}
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if (bh)
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brelse(bh);
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return ERR_PTR(status);
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}
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const struct inode_operations ocfs2_symlink_inode_operations = {
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.readlink = page_readlink,
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.follow_link = ocfs2_follow_link,
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.getattr = ocfs2_getattr,
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.setattr = ocfs2_setattr,
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};
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const struct inode_operations ocfs2_fast_symlink_inode_operations = {
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.readlink = ocfs2_readlink,
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.follow_link = ocfs2_follow_link,
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.getattr = ocfs2_getattr,
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.setattr = ocfs2_setattr,
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};
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