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_fshead.c (3968B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2000-2001 Christoph Hellwig.
      4 * Copyright (c) 2016 Krzysztof Blaszkowski
      5 */
      6
      7/*
      8 * Veritas filesystem driver - fileset header routines.
      9 */
     10#include <linux/fs.h>
     11#include <linux/buffer_head.h>
     12#include <linux/kernel.h>
     13#include <linux/slab.h>
     14#include <linux/string.h>
     15
     16#include "vxfs.h"
     17#include "vxfs_inode.h"
     18#include "vxfs_extern.h"
     19#include "vxfs_fshead.h"
     20
     21
     22#ifdef DIAGNOSTIC
     23static void
     24vxfs_dumpfsh(struct vxfs_fsh *fhp)
     25{
     26	printk("\n\ndumping fileset header:\n");
     27	printk("----------------------------\n");
     28	printk("version: %u\n", fhp->fsh_version);
     29	printk("fsindex: %u\n", fhp->fsh_fsindex);
     30	printk("iauino: %u\tninodes:%u\n",
     31			fhp->fsh_iauino, fhp->fsh_ninodes);
     32	printk("maxinode: %u\tlctino: %u\n",
     33			fhp->fsh_maxinode, fhp->fsh_lctino);
     34	printk("nau: %u\n", fhp->fsh_nau);
     35	printk("ilistino[0]: %u\tilistino[1]: %u\n",
     36			fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
     37}
     38#endif
     39
     40/**
     41 * vxfs_getfsh - read fileset header into memory
     42 * @ip:		the (fake) fileset header inode
     43 * @which:	0 for the structural, 1 for the primary fsh.
     44 *
     45 * Description:
     46 *   vxfs_getfsh reads either the structural or primary fileset header
     47 *   described by @ip into memory.
     48 *
     49 * Returns:
     50 *   The fileset header structure on success, else Zero.
     51 */
     52static struct vxfs_fsh *
     53vxfs_getfsh(struct inode *ip, int which)
     54{
     55	struct buffer_head		*bp;
     56
     57	bp = vxfs_bread(ip, which);
     58	if (bp) {
     59		struct vxfs_fsh		*fhp;
     60
     61		if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
     62			goto out;
     63		memcpy(fhp, bp->b_data, sizeof(*fhp));
     64
     65		put_bh(bp);
     66		return (fhp);
     67	}
     68out:
     69	brelse(bp);
     70	return NULL;
     71}
     72
     73/**
     74 * vxfs_read_fshead - read the fileset headers
     75 * @sbp:	superblock to which the fileset belongs
     76 *
     77 * Description:
     78 *   vxfs_read_fshead will fill the inode and structural inode list in @sb.
     79 *
     80 * Returns:
     81 *   Zero on success, else a negative error code (-EINVAL).
     82 */
     83int
     84vxfs_read_fshead(struct super_block *sbp)
     85{
     86	struct vxfs_sb_info		*infp = VXFS_SBI(sbp);
     87	struct vxfs_fsh			*pfp, *sfp;
     88	struct vxfs_inode_info		*vip;
     89
     90	infp->vsi_fship = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
     91	if (!infp->vsi_fship) {
     92		printk(KERN_ERR "vxfs: unable to read fsh inode\n");
     93		return -EINVAL;
     94	}
     95
     96	vip = VXFS_INO(infp->vsi_fship);
     97	if (!VXFS_ISFSH(vip)) {
     98		printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
     99				vip->vii_mode & VXFS_TYPE_MASK); 
    100		goto out_iput_fship;
    101	}
    102
    103#ifdef DIAGNOSTIC
    104	printk("vxfs: fsh inode dump:\n");
    105	vxfs_dumpi(vip, infp->vsi_fshino);
    106#endif
    107
    108	sfp = vxfs_getfsh(infp->vsi_fship, 0);
    109	if (!sfp) {
    110		printk(KERN_ERR "vxfs: unable to get structural fsh\n");
    111		goto out_iput_fship;
    112	} 
    113
    114#ifdef DIAGNOSTIC
    115	vxfs_dumpfsh(sfp);
    116#endif
    117
    118	pfp = vxfs_getfsh(infp->vsi_fship, 1);
    119	if (!pfp) {
    120		printk(KERN_ERR "vxfs: unable to get primary fsh\n");
    121		goto out_free_sfp;
    122	}
    123
    124#ifdef DIAGNOSTIC
    125	vxfs_dumpfsh(pfp);
    126#endif
    127
    128	infp->vsi_stilist = vxfs_blkiget(sbp, infp->vsi_iext,
    129			fs32_to_cpu(infp, sfp->fsh_ilistino[0]));
    130	if (!infp->vsi_stilist) {
    131		printk(KERN_ERR "vxfs: unable to get structural list inode\n");
    132		goto out_free_pfp;
    133	}
    134	if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
    135		printk(KERN_ERR "vxfs: structural list inode is of wrong type (%x)\n",
    136				VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK); 
    137		goto out_iput_stilist;
    138	}
    139
    140	infp->vsi_ilist = vxfs_stiget(sbp, fs32_to_cpu(infp, pfp->fsh_ilistino[0]));
    141	if (!infp->vsi_ilist) {
    142		printk(KERN_ERR "vxfs: unable to get inode list inode\n");
    143		goto out_iput_stilist;
    144	}
    145	if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
    146		printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
    147				VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
    148		goto out_iput_ilist;
    149	}
    150
    151	kfree(pfp);
    152	kfree(sfp);
    153	return 0;
    154
    155 out_iput_ilist:
    156 	iput(infp->vsi_ilist);
    157 out_iput_stilist:
    158 	iput(infp->vsi_stilist);
    159 out_free_pfp:
    160	kfree(pfp);
    161 out_free_sfp:
    162 	kfree(sfp);
    163 out_iput_fship:
    164	iput(infp->vsi_fship);
    165	return -EINVAL;
    166}