cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vxfs_olt.c (2510B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2000-2001 Christoph Hellwig.
      4 */
      5
      6/* 
      7 * Veritas filesystem driver - object location table support.
      8 */
      9#include <linux/fs.h>
     10#include <linux/buffer_head.h>
     11#include <linux/kernel.h>
     12
     13#include "vxfs.h"
     14#include "vxfs_olt.h"
     15#include "vxfs_extern.h"
     16
     17
     18static inline void
     19vxfs_get_fshead(struct vxfs_oltfshead *fshp, struct vxfs_sb_info *infp)
     20{
     21	BUG_ON(infp->vsi_fshino);
     22	infp->vsi_fshino = fs32_to_cpu(infp, fshp->olt_fsino[0]);
     23}
     24
     25static inline void
     26vxfs_get_ilist(struct vxfs_oltilist *ilistp, struct vxfs_sb_info *infp)
     27{
     28	BUG_ON(infp->vsi_iext);
     29	infp->vsi_iext = fs32_to_cpu(infp, ilistp->olt_iext[0]);
     30}
     31
     32static inline u_long
     33vxfs_oblock(struct super_block *sbp, daddr_t block, u_long bsize)
     34{
     35	BUG_ON(sbp->s_blocksize % bsize);
     36	return (block * (sbp->s_blocksize / bsize));
     37}
     38
     39
     40/**
     41 * vxfs_read_olt - read olt
     42 * @sbp:	superblock of the filesystem
     43 * @bsize:	blocksize of the filesystem
     44 *
     45 * Description:
     46 *   vxfs_read_olt reads the olt of the filesystem described by @sbp
     47 *   into main memory and does some basic setup.
     48 *
     49 * Returns:
     50 *   Zero on success, else a negative error code.
     51 */
     52int
     53vxfs_read_olt(struct super_block *sbp, u_long bsize)
     54{
     55	struct vxfs_sb_info	*infp = VXFS_SBI(sbp);
     56	struct buffer_head	*bp;
     57	struct vxfs_olt		*op;
     58	char			*oaddr, *eaddr;
     59
     60	bp = sb_bread(sbp, vxfs_oblock(sbp, infp->vsi_oltext, bsize));
     61	if (!bp || !bp->b_data)
     62		goto fail;
     63
     64	op = (struct vxfs_olt *)bp->b_data;
     65	if (fs32_to_cpu(infp, op->olt_magic) != VXFS_OLT_MAGIC) {
     66		printk(KERN_NOTICE "vxfs: ivalid olt magic number\n");
     67		goto fail;
     68	}
     69
     70	/*
     71	 * It is in theory possible that vsi_oltsize is > 1.
     72	 * I've not seen any such filesystem yet and I'm lazy..  --hch
     73	 */
     74	if (infp->vsi_oltsize > 1) {
     75		printk(KERN_NOTICE "vxfs: oltsize > 1 detected.\n");
     76		printk(KERN_NOTICE "vxfs: please notify hch@infradead.org\n");
     77		goto fail;
     78	}
     79
     80	oaddr = bp->b_data + fs32_to_cpu(infp, op->olt_size);
     81	eaddr = bp->b_data + (infp->vsi_oltsize * sbp->s_blocksize);
     82
     83	while (oaddr < eaddr) {
     84		struct vxfs_oltcommon	*ocp =
     85			(struct vxfs_oltcommon *)oaddr;
     86		
     87		switch (fs32_to_cpu(infp, ocp->olt_type)) {
     88		case VXFS_OLT_FSHEAD:
     89			vxfs_get_fshead((struct vxfs_oltfshead *)oaddr, infp);
     90			break;
     91		case VXFS_OLT_ILIST:
     92			vxfs_get_ilist((struct vxfs_oltilist *)oaddr, infp);
     93			break;
     94		}
     95
     96		oaddr += fs32_to_cpu(infp, ocp->olt_size);
     97	}
     98
     99	brelse(bp);
    100	return (infp->vsi_fshino && infp->vsi_iext) ? 0 : -EINVAL;
    101
    102fail:
    103	brelse(bp);
    104	return -EINVAL;
    105}