fs/freevxfs/vxfs_fshead.c

   1 /*
   2  * Copyright (c) 2000-2001 Christoph Hellwig.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions, and the following disclaimer,
  10  *    without modification.
  11  * 2. The name of the author may not be used to endorse or promote products
  12  *    derived from this software without specific prior written permission.
  13  *
  14  * Alternatively, this software may be distributed under the terms of the
  15  * GNU General Public License ("GPL").
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * Veritas filesystem driver - fileset header routines.
  32  */
  33 #include <linux/fs.h>
  34 #include <linux/buffer_head.h>
  35 #include <linux/kernel.h>
  36 #include <linux/slab.h>
  37 #include <linux/string.h>
  38
  39 #include "vxfs.h"
  40 #include "vxfs_inode.h"
  41 #include "vxfs_extern.h"
  42 #include "vxfs_fshead.h"
  43
  44
  45 #ifdef DIAGNOSTIC
  46 static void
  47 vxfs_dumpfsh(struct vxfs_fsh *fhp)
  48 {
  49         printk("\n\ndumping fileset header:\n");
  50         printk("----------------------------\n");
  51         printk("version: %u\n", fhp->fsh_version);
  52         printk("fsindex: %u\n", fhp->fsh_fsindex);
  53         printk("iauino: %u\tninodes:%u\n",
  54                         fhp->fsh_iauino, fhp->fsh_ninodes);
  55         printk("maxinode: %u\tlctino: %u\n",
  56                         fhp->fsh_maxinode, fhp->fsh_lctino);
  57         printk("nau: %u\n", fhp->fsh_nau);
  58         printk("ilistino[0]: %u\tilistino[1]: %u\n",
  59                         fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
  60 }
  61 #endif
  62
  63 /**
  64  * vxfs_getfsh - read fileset header into memory
  65  * @ip:         the (fake) fileset header inode
  66  * @which:      0 for the structural, 1 for the primary fsh.
  67  *
  68  * Description:
  69  *   vxfs_getfsh reads either the structural or primary fileset header
  70  *   described by @ip into memory.
  71  *
  72  * Returns:
  73  *   The fileset header structure on success, else Zero.
  74  */
  75 static struct vxfs_fsh *
  76 vxfs_getfsh(struct inode *ip, int which)
  77 {
  78         struct buffer_head              *bp;
  79
  80         bp = vxfs_bread(ip, which);
  81         if (bp) {
  82                 struct vxfs_fsh         *fhp;
  83
  84                 if (!(fhp = kmalloc(sizeof(*fhp), GFP_KERNEL)))
  85                         goto out;
  86                 memcpy(fhp, bp->b_data, sizeof(*fhp));
  87
  88                 put_bh(bp);
  89                 return (fhp);
  90         }
  91 out:
  92         brelse(bp);
  93         return NULL;
  94 }
  95
  96 /**
  97  * vxfs_read_fshead - read the fileset headers
  98  * @sbp:        superblock to which the fileset belongs
  99  *
 100  * Description:
 101  *   vxfs_read_fshead will fill the inode and structural inode list in @sb.
 102  *
 103  * Returns:
 104  *   Zero on success, else a negative error code (-EINVAL).
 105  */
 106 int
 107 vxfs_read_fshead(struct super_block *sbp)
 108 {
 109         struct vxfs_sb_info             *infp = VXFS_SBI(sbp);
 110         struct vxfs_fsh                 *pfp, *sfp;
 111         struct vxfs_inode_info          *vip, *tip;
 112
 113         vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
 114         if (!vip) {
 115                 printk(KERN_ERR "vxfs: unabled to read fsh inode\n");
 116                 return -EINVAL;
 117         }
 118         if (!VXFS_ISFSH(vip)) {
 119                 printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
 120                                 vip->vii_mode & VXFS_TYPE_MASK);
 121                 goto out_free_fship;
 122         }
 123
 124
 125 #ifdef DIAGNOSTIC
 126         printk("vxfs: fsh inode dump:\n");
 127         vxfs_dumpi(vip, infp->vsi_fshino);
 128 #endif
 129
 130         infp->vsi_fship = vxfs_get_fake_inode(sbp, vip);
 131         if (!infp->vsi_fship) {
 132                 printk(KERN_ERR "vxfs: unabled to get fsh inode\n");
 133                 goto out_free_fship;
 134         }
 135
 136         sfp = vxfs_getfsh(infp->vsi_fship, 0);
 137         if (!sfp) {
 138                 printk(KERN_ERR "vxfs: unabled to get structural fsh\n");
 139                 goto out_iput_fship;
 140         }
 141
 142 #ifdef DIAGNOSTIC
 143         vxfs_dumpfsh(sfp);
 144 #endif
 145
 146         pfp = vxfs_getfsh(infp->vsi_fship, 1);
 147         if (!pfp) {
 148                 printk(KERN_ERR "vxfs: unabled to get primary fsh\n");
 149                 goto out_free_sfp;
 150         }
 151
 152 #ifdef DIAGNOSTIC
 153         vxfs_dumpfsh(pfp);
 154 #endif
 155
 156         tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
 157         if (!tip)
 158                 goto out_free_pfp;
 159
 160         infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip);
 161         if (!infp->vsi_stilist) {
 162                 printk(KERN_ERR "vxfs: unabled to get structual list inode\n");
 163                 kfree(tip);
 164                 goto out_free_pfp;
 165         }
 166         if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
 167                 printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",
 168                                 VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
 169                 goto out_iput_stilist;
 170         }
 171
 172         tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
 173         if (!tip)
 174                 goto out_iput_stilist;
 175         infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip);
 176         if (!infp->vsi_ilist) {
 177                 printk(KERN_ERR "vxfs: unabled to get inode list inode\n");
 178                 kfree(tip);
 179                 goto out_iput_stilist;
 180         }
 181         if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
 182                 printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
 183                                 VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
 184                 goto out_iput_ilist;
 185         }
 186
 187         return 0;
 188
 189  out_iput_ilist:
 190         iput(infp->vsi_ilist);
 191  out_iput_stilist:
 192         iput(infp->vsi_stilist);
 193  out_free_pfp:
 194         kfree(pfp);
 195  out_free_sfp:
 196         kfree(sfp);
 197  out_iput_fship:
 198         iput(infp->vsi_fship);
 199         return -EINVAL;
 200  out_free_fship:
 201         kfree(vip);
 202         return -EINVAL;
 203 }