LXR linux/fs/ocfs2/symlink.c

   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 *  linux/cluster/ssi/cfs/symlink.c
   5 *
   6 *      This program is free software; you can redistribute it and/or
   7 *      modify it under the terms of the GNU General Public License as
   8 *      published by the Free Software Foundation; either version 2 of
   9 *      the License, or (at your option) any later version.
  10 *
  11 *      This program is distributed in the hope that it will be useful,
  12 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *      MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
  14 *      or NON INFRINGEMENT.  See the GNU General Public License for more
  15 *      details.
  16 *
  17 *      You should have received a copy of the GNU General Public License
  18 *      along with this program; if not, write to the Free Software
  19 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 *
  21 *      Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
  22 *
  23 *  Copyright (C) 1992  Rick Sladkey
  24 *
  25 *  Optimization changes Copyright (C) 1994 Florian La Roche
  26 *
  27 *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
  28 *
  29 *  Portions Copyright (C) 2001 Compaq Computer Corporation
  30 *
  31 *  ocfs2 symlink handling code.
  32 *
  33 *  Copyright (C) 2004, 2005 Oracle.
  34 *
  35 */
  36
  37#include <linux/fs.h>
  38#include <linux/types.h>
  39#include <linux/slab.h>
  40#include <linux/pagemap.h>
  41#include <linux/namei.h>
  42
  43#include <cluster/masklog.h>
  44
  45#include "ocfs2.h"
  46
  47#include "alloc.h"
  48#include "file.h"
  49#include "inode.h"
  50#include "journal.h"
  51#include "symlink.h"
  52#include "xattr.h"
  53
  54#include "buffer_head_io.h"
  55
  56
  57static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
  58{
  59        struct inode *inode = page->mapping->host;
  60        struct buffer_head *bh = NULL;
  61        int status = ocfs2_read_inode_block(inode, &bh);
  62        struct ocfs2_dinode *fe;
  63        const char *link;
  64        void *kaddr;
  65        size_t len;
  66
  67        if (status < 0) {
  68                mlog_errno(status);
  69                return status;
  70        }
  71
  72        fe = (struct ocfs2_dinode *) bh->b_data;
  73        link = (char *) fe->id2.i_symlink;
  74        /* will be less than a page size */
  75        len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
  76        kaddr = kmap_atomic(page);
  77        memcpy(kaddr, link, len + 1);
  78        kunmap_atomic(kaddr);
  79        SetPageUptodate(page);
  80        unlock_page(page);
  81        brelse(bh);
  82        return 0;
  83}
  84
  85const struct address_space_operations ocfs2_fast_symlink_aops = {
  86        .readpage               = ocfs2_fast_symlink_readpage,
  87};
  88
  89const struct inode_operations ocfs2_symlink_inode_operations = {
  90        .get_link       = page_get_link,
  91        .getattr        = ocfs2_getattr,
  92        .setattr        = ocfs2_setattr,
  93        .listxattr      = ocfs2_listxattr,
  94        .fiemap         = ocfs2_fiemap,
  95};
  96