Quelle  vxfs_fshead.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * Copyright (c) 2016 Krzysztof Blaszkowski
 */

/*
 * Veritas filesystem driver - fileset header routines.
 */
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>

#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"
#include "vxfs_fshead.h"


#ifdef DIAGNOSTIC
static void
vxfs_dumpfsh(struct vxfs_fsh *fhp)
{
 printk("\n\ndumping fileset header:\n");
 printk("----------------------------\n");
 printk("version: %u\n", fhp->fsh_version);
 printk("fsindex: %u\n", fhp->fsh_fsindex);
 printk("iauino: %u\tninodes:%u\n",
   fhp->fsh_iauino, fhp->fsh_ninodes);
 printk("maxinode: %u\tlctino: %u\n",
   fhp->fsh_maxinode, fhp->fsh_lctino);
 printk("nau: %u\n", fhp->fsh_nau);
 printk("ilistino[0]: %u\tilistino[1]: %u\n",
   fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
}
#endif

/**
 * vxfs_getfsh - read fileset header into memory
 * @ip: the (fake) fileset header inode
 * @which: 0 for the structural, 1 for the primary fsh.
 *
 * Description:
 *   vxfs_getfsh reads either the structural or primary fileset header
 *   described by @ip into memory.
 *
 * Returns:
 *   The fileset header structure on success, else Zero.
 */
static struct vxfs_fsh *
vxfs_getfsh(struct inode *ip, int which)
{
 struct buffer_head  *bp;

 bp = vxfs_bread(ip, which);
 if (bp) {
  struct vxfs_fsh  *fhp;

  if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
   goto out;
  memcpy(fhp, bp->b_data, sizeof(*fhp));

  put_bh(bp);
  return (fhp);
 }
out:
 brelse(bp);
 return NULL;
}

/**
 * vxfs_read_fshead - read the fileset headers
 * @sbp: superblock to which the fileset belongs
 *
 * Description:
 *   vxfs_read_fshead will fill the inode and structural inode list in @sb.
 *
 * Returns:
 *   Zero on success, else a negative error code (-EINVAL).
 */
int
vxfs_read_fshead(struct super_block *sbp)
{
 struct vxfs_sb_info  *infp = VXFS_SBI(sbp);
 struct vxfs_fsh   *pfp, *sfp;
 struct vxfs_inode_info  *vip;

 infp->vsi_fship = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
 if (!infp->vsi_fship) {
  printk(KERN_ERR "vxfs: unable to read fsh inode\n");
  return -EINVAL;
 }

 vip = VXFS_INO(infp->vsi_fship);
 if (!VXFS_ISFSH(vip)) {
  printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
    vip->vii_mode & VXFS_TYPE_MASK); 
  goto out_iput_fship;
 }

#ifdef DIAGNOSTIC
 printk("vxfs: fsh inode dump:\n");
 vxfs_dumpi(vip, infp->vsi_fshino);
#endif

 sfp = vxfs_getfsh(infp->vsi_fship, 0);
 if (!sfp) {
  printk(KERN_ERR "vxfs: unable to get structural fsh\n");
  goto out_iput_fship;
 } 

#ifdef DIAGNOSTIC
 vxfs_dumpfsh(sfp);
#endif

 pfp = vxfs_getfsh(infp->vsi_fship, 1);
 if (!pfp) {
  printk(KERN_ERR "vxfs: unable to get primary fsh\n");
  goto out_free_sfp;
 }

#ifdef DIAGNOSTIC
 vxfs_dumpfsh(pfp);
#endif

 infp->vsi_stilist = vxfs_blkiget(sbp, infp->vsi_iext,
   fs32_to_cpu(infp, sfp->fsh_ilistino[0]));
 if (!infp->vsi_stilist) {
  printk(KERN_ERR "vxfs: unable to get structural list inode\n");
  goto out_free_pfp;
 }
 if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
  printk(KERN_ERR "vxfs: structural list inode is of wrong type (%x)\n",
    VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK); 
  goto out_iput_stilist;
 }

 infp->vsi_ilist = vxfs_stiget(sbp, fs32_to_cpu(infp, pfp->fsh_ilistino[0]));
 if (!infp->vsi_ilist) {
  printk(KERN_ERR "vxfs: unable to get inode list inode\n");
  goto out_iput_stilist;
 }
 if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
  printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
    VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
  goto out_iput_ilist;
 }

 kfree(pfp);
 kfree(sfp);
 return 0;

 out_iput_ilist:
  iput(infp->vsi_ilist);
 out_iput_stilist:
  iput(infp->vsi_stilist);
 out_free_pfp:
 kfree(pfp);
 out_free_sfp:
  kfree(sfp);
 out_iput_fship:
 iput(infp->vsi_fship);
 return -EINVAL;
}