symlink.c

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/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 *  linux/cluster/ssi/cfs/symlink.c
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as
 *  published by the Free Software Foundation; either version 2 of
 *  the License, or (at your option) any later version.
 *
 *  This program 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, GOOD TITLE
 *  or NON INFRINGEMENT.  See the GNU General Public License for more
 *  details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Questions/Comments/Bugfixes to [email protected]
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  Optimization changes Copyright (C) 1994 Florian La Roche
 *
 *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
 *
 *  Portions Copyright (C) 2001 Compaq Computer Corporation
 *
 *  ocfs2 symlink handling code.
 *
 *  Copyright (C) 2004, 2005 Oracle.
 *
 */

#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/namei.h>

#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "symlink.h"
#include "xattr.h"

#include "buffer_head_io.h"


static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
{
    struct inode *inode = page->mapping->host;
    struct buffer_head *bh;
    int status = ocfs2_read_inode_block(inode, &bh);
    struct ocfs2_dinode *fe;
    const char *link;
    void *kaddr;
    size_t len;

    if (status < 0) {
        mlog_errno(status);
        return status;
    }

    fe = (struct ocfs2_dinode *) bh->b_data;
    link = (char *) fe->id2.i_symlink;
    /* will be less than a page size */
    len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
    kaddr = kmap_atomic(page);
    memcpy(kaddr, link, len + 1);
    kunmap_atomic(kaddr);
    SetPageUptodate(page);
    unlock_page(page);
    brelse(bh);
    return 0;
}

const struct address_space_operations ocfs2_fast_symlink_aops = {
    .readpage       = ocfs2_fast_symlink_readpage,
};

const struct inode_operations ocfs2_symlink_inode_operations = {
    .readlink   = generic_readlink,
    .follow_link    = page_follow_link_light,
    .put_link   = page_put_link,
    .getattr    = ocfs2_getattr,
    .setattr    = ocfs2_setattr,
    .setxattr   = generic_setxattr,
    .getxattr   = generic_getxattr,
    .listxattr  = ocfs2_listxattr,
    .removexattr    = generic_removexattr,
    .fiemap     = ocfs2_fiemap,
};