mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 17:23:55 +08:00
0d83f7fc83
To support VxFS filesystems from HP-UX on x86 systems we need to implement byte swapping, and to keep support for Unixware filesystems it needs to be the complicated dual-endian kind ala sysvfs. To do this properly we have to split the on disk and in-core inode so that we can keep the in-core one in native endianness. All other structures are byteswapped on demand. Signed-off-by: Krzysztof Błaszkowski <kb@sysmikro.com.pl> [hch: make spare happy] Signed-off-by: Christoph Hellwig <hch@lst.de>
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/*
|
|
* 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 - object location table support.
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include "vxfs.h"
|
|
#include "vxfs_olt.h"
|
|
#include "vxfs_extern.h"
|
|
|
|
|
|
static inline void
|
|
vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
|
|
{
|
|
BUG_ON(infp->vsi_fshino);
|
|
infp->vsi_fshino = fs32_to_cpu(infp, fshp->olt_fsino[0]);
|
|
}
|
|
|
|
static inline void
|
|
vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp)
|
|
{
|
|
BUG_ON(infp->vsi_iext);
|
|
infp->vsi_iext = fs32_to_cpu(infp, ilistp->olt_iext[0]);
|
|
}
|
|
|
|
static inline u_long
|
|
vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize)
|
|
{
|
|
BUG_ON(sbp->s_blocksize % bsize);
|
|
return (block * (sbp->s_blocksize / bsize));
|
|
}
|
|
|
|
|
|
/**
|
|
* vxfs_read_olt - read olt
|
|
* @sbp: superblock of the filesystem
|
|
* @bsize: blocksize of the filesystem
|
|
*
|
|
* Description:
|
|
* vxfs_read_olt reads the olt of the filesystem described by @sbp
|
|
* into main memory and does some basic setup.
|
|
*
|
|
* Returns:
|
|
* Zero on success, else a negative error code.
|
|
*/
|
|
int
|
|
vxfs_read_olt(struct super_block *sbp, u_long bsize)
|
|
{
|
|
struct vxfs_sb_info *infp = VXFS_SBI(sbp);
|
|
struct buffer_head *bp;
|
|
struct vxfs_olt *op;
|
|
char *oaddr, *eaddr;
|
|
|
|
bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize));
|
|
if (!bp || !bp->b_data)
|
|
goto fail;
|
|
|
|
op = (struct vxfs_olt *)bp->b_data;
|
|
if (fs32_to_cpu(infp, op->olt_magic) != VXFS_OLT_MAGIC) {
|
|
printk(KERN_NOTICE "vxfs: ivalid olt magic number\n");
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* It is in theory possible that vsi_oltsize is > 1.
|
|
* I've not seen any such filesystem yet and I'm lazy.. --hch
|
|
*/
|
|
if (infp->vsi_oltsize > 1) {
|
|
printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n");
|
|
printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n");
|
|
goto fail;
|
|
}
|
|
|
|
oaddr = bp->b_data + fs32_to_cpu(infp, op->olt_size);
|
|
eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
|
|
|
|
while (oaddr < eaddr) {
|
|
struct vxfs_oltcommon *ocp =
|
|
(struct vxfs_oltcommon *)oaddr;
|
|
|
|
switch (fs32_to_cpu(infp, ocp->olt_type)) {
|
|
case VXFS_OLT_FSHEAD:
|
|
vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp);
|
|
break;
|
|
case VXFS_OLT_ILIST:
|
|
vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp);
|
|
break;
|
|
}
|
|
|
|
oaddr += fs32_to_cpu(infp, ocp->olt_size);
|
|
}
|
|
|
|
brelse(bp);
|
|
return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL;
|
|
|
|
fail:
|
|
brelse(bp);
|
|
return -EINVAL;
|
|
}
|