https://github.com/torvalds/linux
Tip revision: 09a9639e56c01c7a00d6c0ca63f4c7c41abe075d authored by Linus Torvalds on 09 April 2023, 18:15:57 UTC
Linux 6.3-rc6
Linux 6.3-rc6
Tip revision: 09a9639
vxfs_olt.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2000-2001 Christoph Hellwig.
*/
/*
* 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;
}