linux-imx

/*

 * Copyright (c) 2000-2001 Christoph Hellwig.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL").

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR

 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

​

/*

 * Veritas filesystem driver - filesystem to disk block mapping.

 */

#include <linux/fs.h>

#include <linux/buffer_head.h>

#include <linux/kernel.h>

​

#include "vxfs.h"

#include "vxfs_inode.h"

#include "vxfs_extern.h"

​

​

#ifdef DIAGNOSTIC

static void

vxfs_typdump(struct vxfs_typed *typ)

{

    printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT);

    printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK);

    printk("block=%x ", typ->vt_block);

    printk("size=%x\n", typ->vt_size);

}

#endif

​

/**

 * vxfs_bmap_ext4 - do bmap for ext4 extents

 * @ip:     pointer to the inode we do bmap for

 * @iblock: logical block.

 *

 * Description:

 *   vxfs_bmap_ext4 performs the bmap operation for inodes with

 *   ext4-style extents (which are much like the traditional UNIX

 *   inode organisation).

 *

 * Returns:

 *   The physical block number on success, else Zero.

 */

static daddr_t

vxfs_bmap_ext4(struct inode *ip, long bn)

{

    struct super_block *sb = ip->i_sb;

    struct vxfs_inode_info *vip = VXFS_INO(ip);

    struct vxfs_sb_info *sbi = VXFS_SBI(sb);

    unsigned long bsize = sb->s_blocksize;

    u32 indsize = fs32_to_cpu(sbi, vip->vii_ext4.ve4_indsize);

    int i;

​

    if (indsize > sb->s_blocksize)

        goto fail_size;

​

    for (i = 0; i < VXFS_NDADDR; i++) {

        struct direct *d = vip->vii_ext4.ve4_direct + i;

        if (bn >= 0 && bn < fs32_to_cpu(sbi, d->size))

            return (bn + fs32_to_cpu(sbi, d->extent));

        bn -= fs32_to_cpu(sbi, d->size);

    }

​

    if ((bn / (indsize * indsize * bsize / 4)) == 0) {

        struct buffer_head *buf;

        daddr_t bno;

        __fs32 *indir;

​

        buf = sb_bread(sb,

            fs32_to_cpu(sbi, vip->vii_ext4.ve4_indir[0]));