282 lines
7.2 KiB
C
282 lines
7.2 KiB
C
/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL").
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Veritas filesystem driver - filesystem to disk block mapping.
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*/
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/kernel.h>
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#include "vxfs.h"
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#include "vxfs_inode.h"
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#include "vxfs_extern.h"
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#ifdef DIAGNOSTIC
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static void
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vxfs_typdump(struct vxfs_typed *typ)
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{
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printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT);
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printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
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printk("block=%x ", typ->vt_block);
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printk("size=%x\n", typ->vt_size);
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}
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#endif
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/**
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* vxfs_bmap_ext4 - do bmap for ext4 extents
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* @ip: pointer to the inode we do bmap for
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* @iblock: logical block.
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*
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* Description:
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* vxfs_bmap_ext4 performs the bmap operation for inodes with
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* ext4-style extents (which are much like the traditional UNIX
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* inode organisation).
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*
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* Returns:
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* The physical block number on success, else Zero.
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*/
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static daddr_t
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vxfs_bmap_ext4(struct inode *ip, long bn)
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{
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struct super_block *sb = ip->i_sb;
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struct vxfs_inode_info *vip = VXFS_INO(ip);
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unsigned long bsize = sb->s_blocksize;
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u32 indsize = vip->vii_ext4.ve4_indsize;
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int i;
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if (indsize > sb->s_blocksize)
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goto fail_size;
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for (i = 0; i < VXFS_NDADDR; i++) {
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struct direct *d = vip->vii_ext4.ve4_direct + i;
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if (bn >= 0 && bn < d->size)
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return (bn + d->extent);
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bn -= d->size;
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}
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if ((bn / (indsize * indsize * bsize / 4)) == 0) {
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struct buffer_head *buf;
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daddr_t bno;
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u32 *indir;
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buf = sb_bread(sb, vip->vii_ext4.ve4_indir[0]);
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if (!buf || !buffer_mapped(buf))
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goto fail_buf;
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indir = (u32 *)buf->b_data;
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bno = indir[(bn/indsize) % (indsize*bn)] + (bn%indsize);
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brelse(buf);
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return bno;
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} else
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printk(KERN_WARNING "no matching indir?");
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return 0;
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fail_size:
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printk("vxfs: indirect extent too big!\n");
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fail_buf:
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return 0;
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}
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/**
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* vxfs_bmap_indir - recursion for vxfs_bmap_typed
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* @ip: pointer to the inode we do bmap for
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* @indir: indirect block we start reading at
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* @size: size of the typed area to search
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* @block: partially result from further searches
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*
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* Description:
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* vxfs_bmap_indir reads a &struct vxfs_typed at @indir
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* and performs the type-defined action.
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*
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* Return Value:
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* The physical block number on success, else Zero.
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*
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* Note:
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* Kernelstack is rare. Unrecurse?
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*/
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static daddr_t
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vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
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{
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struct buffer_head *bp = NULL;
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daddr_t pblock = 0;
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int i;
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for (i = 0; i < size * VXFS_TYPED_PER_BLOCK(ip->i_sb); i++) {
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struct vxfs_typed *typ;
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int64_t off;
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bp = sb_bread(ip->i_sb,
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indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
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if (!buffer_mapped(bp))
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return 0;
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typ = ((struct vxfs_typed *)bp->b_data) +
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(i % VXFS_TYPED_PER_BLOCK(ip->i_sb));
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off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
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if (block < off) {
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brelse(bp);
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continue;
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}
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switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
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case VXFS_TYPED_INDIRECT:
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pblock = vxfs_bmap_indir(ip, typ->vt_block,
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typ->vt_size, block - off);
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if (pblock == -2)
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break;
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goto out;
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case VXFS_TYPED_DATA:
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if ((block - off) >= typ->vt_size)
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break;
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pblock = (typ->vt_block + block - off);
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goto out;
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case VXFS_TYPED_INDIRECT_DEV4:
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case VXFS_TYPED_DATA_DEV4: {
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struct vxfs_typed_dev4 *typ4 =
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(struct vxfs_typed_dev4 *)typ;
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printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
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printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
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(unsigned long long) typ4->vd4_block,
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(unsigned long long) typ4->vd4_size,
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typ4->vd4_dev);
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goto fail;
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}
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default:
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BUG();
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}
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brelse(bp);
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}
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fail:
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pblock = 0;
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out:
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brelse(bp);
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return (pblock);
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}
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/**
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* vxfs_bmap_typed - bmap for typed extents
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* @ip: pointer to the inode we do bmap for
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* @iblock: logical block
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*
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* Description:
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* Performs the bmap operation for typed extents.
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*
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* Return Value:
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* The physical block number on success, else Zero.
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*/
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static daddr_t
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vxfs_bmap_typed(struct inode *ip, long iblock)
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{
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struct vxfs_inode_info *vip = VXFS_INO(ip);
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daddr_t pblock = 0;
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int i;
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for (i = 0; i < VXFS_NTYPED; i++) {
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struct vxfs_typed *typ = vip->vii_org.typed + i;
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int64_t off = (typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
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#ifdef DIAGNOSTIC
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vxfs_typdump(typ);
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#endif
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if (iblock < off)
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continue;
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switch ((u_int32_t)(typ->vt_hdr >> VXFS_TYPED_TYPESHIFT)) {
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case VXFS_TYPED_INDIRECT:
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pblock = vxfs_bmap_indir(ip, typ->vt_block,
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typ->vt_size, iblock - off);
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if (pblock == -2)
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break;
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return (pblock);
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case VXFS_TYPED_DATA:
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if ((iblock - off) < typ->vt_size)
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return (typ->vt_block + iblock - off);
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break;
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case VXFS_TYPED_INDIRECT_DEV4:
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case VXFS_TYPED_DATA_DEV4: {
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struct vxfs_typed_dev4 *typ4 =
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(struct vxfs_typed_dev4 *)typ;
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printk(KERN_INFO "\n\nTYPED_DEV4 detected!\n");
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printk(KERN_INFO "block: %Lu\tsize: %Ld\tdev: %d\n",
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(unsigned long long) typ4->vd4_block,
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(unsigned long long) typ4->vd4_size,
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typ4->vd4_dev);
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return 0;
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}
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default:
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BUG();
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}
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}
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return 0;
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}
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/**
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* vxfs_bmap1 - vxfs-internal bmap operation
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* @ip: pointer to the inode we do bmap for
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* @iblock: logical block
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*
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* Description:
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* vxfs_bmap1 perfoms a logical to physical block mapping
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* for vxfs-internal purposes.
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*
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* Return Value:
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* The physical block number on success, else Zero.
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*/
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daddr_t
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vxfs_bmap1(struct inode *ip, long iblock)
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{
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struct vxfs_inode_info *vip = VXFS_INO(ip);
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if (VXFS_ISEXT4(vip))
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return vxfs_bmap_ext4(ip, iblock);
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if (VXFS_ISTYPED(vip))
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return vxfs_bmap_typed(ip, iblock);
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if (VXFS_ISNONE(vip))
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goto unsupp;
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if (VXFS_ISIMMED(vip))
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goto unsupp;
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printk(KERN_WARNING "vxfs: inode %ld has no valid orgtype (%x)\n",
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ip->i_ino, vip->vii_orgtype);
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BUG();
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unsupp:
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printk(KERN_WARNING "vxfs: inode %ld has an unsupported orgtype (%x)\n",
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ip->i_ino, vip->vii_orgtype);
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return 0;
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}
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