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 #ident "$Id: vxfs_fshead.c,v 1.20 2002/01/02 22:02:12 hch Exp hch $"
  31
  32 /*
  33  * Veritas filesystem driver - fileset header routines.
  34  */
  35 #include <linux/fs.h>
  36 #include <linux/buffer_head.h>
  37 #include <linux/kernel.h>
  38 #include <linux/slab.h>
  39
  40 #include "vxfs.h"
  41 #include "vxfs_inode.h"
  42 #include "vxfs_extern.h"
  43 #include "vxfs_fshead.h"
  44
  45
  46 #ifdef DIAGNOSTIC
  47 static void
  48 vxfs_dumpfsh(struct vxfs_fsh *fhp)
  49 {
  50         printk("\n\ndumping fileset header:\n");
  51         printk("----------------------------\n");
  52         printk("version: %u\n", fhp->fsh_version);
  53         printk("fsindex: %u\n", fhp->fsh_fsindex);
  54         printk("iauino: %u\tninodes:%u\n",
  55                         fhp->fsh_iauino, fhp->fsh_ninodes);
  56         printk("maxinode: %u\tlctino: %u\n",
  57                         fhp->fsh_maxinode, fhp->fsh_lctino);
  58         printk("nau: %u\n", fhp->fsh_nau);
  59         printk("ilistino[0]: %u\tilistino[1]: %u\n",
  60                         fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
  61 }
  62 #endif
  63
  64 /**
  65  * vxfs_getfsh - read fileset header into memory
  66  * @ip:         the (fake) fileset header inode
  67  * @which:      0 for the structural, 1 for the primary fsh.
  68  *
  69  * Description:
  70  *   vxfs_getfsh reads either the structural or primary fileset header
  71  *   described by @ip into memory.
  72  *
  73  * Returns:
  74  *   The fileset header structure on success, else Zero.
  75  */
  76 static struct vxfs_fsh *
  77 vxfs_getfsh(struct inode *ip, int which)
  78 {
  79         struct buffer_head              *bp;
  80
  81         bp = vxfs_bread(ip, which);
  82         if (buffer_mapped(bp)) {
  83                 struct vxfs_fsh         *fhp;
  84
  85                 if (!(fhp = kmalloc(sizeof(*fhp), SLAB_KERNEL)))
  86                         return NULL;
  87                 memcpy(fhp, bp->b_data, sizeof(*fhp));
  88
  89                 brelse(bp);
  90                 return (fhp);
  91         }
  92
  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         if (!(vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino))) {
 114                 printk(KERN_ERR "vxfs: unabled to read fsh inode\n");
 115                 return -EINVAL;
 116         } else if (!VXFS_ISFSH(vip)) {
 117                 printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
 118                                 vip->vii_mode & VXFS_TYPE_MASK);
 119                 return -EINVAL;
 120         }
 121
 122
 123 #ifdef DIAGNOSTIC
 124         printk("vxfs: fsh inode dump:\n");
 125         vxfs_dumpi(vip, infp->vsi_fshino);
 126 #endif
 127
 128         if (!(infp->vsi_fship = vxfs_get_fake_inode(sbp, vip))) {
 129                 printk(KERN_ERR "vxfs: unabled to get fsh inode\n");
 130                 return -EINVAL;
 131         }
 132
 133         if (!(sfp = vxfs_getfsh(infp->vsi_fship, 0))) {
 134                 printk(KERN_ERR "vxfs: unabled to get structural fsh\n");
 135                 return -EINVAL;
 136         }
 137
 138 #ifdef DIAGNOSTIC
 139         vxfs_dumpfsh(sfp);
 140 #endif
 141
 142         if (!(pfp = vxfs_getfsh(infp->vsi_fship, 1))) {
 143                 printk(KERN_ERR "vxfs: unabled to get primary fsh\n");
 144                 return -EINVAL;
 145         }
 146
 147 #ifdef DIAGNOSTIC
 148         vxfs_dumpfsh(pfp);
 149 #endif
 150
 151         tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
 152         if (!tip || ((infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {
 153                 printk(KERN_ERR "vxfs: unabled to get structual list inode\n");
 154                 return -EINVAL;
 155         } else if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
 156                 printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",
 157                                 VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
 158                 return -EINVAL;
 159         }
 160
 161         tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
 162         if (!tip || ((infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {
 163                 printk(KERN_ERR "vxfs: unabled to get inode list inode\n");
 164                 return -EINVAL;
 165         } else if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
 166                 printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
 167                                 VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
 168                 return -EINVAL;
 169         }
 170
 171         return 0;
 172 }