vxfs_fshead.c

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/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * 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

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;
}

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, *tip;

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


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

    infp->vsi_fship = vxfs_get_fake_inode(sbp, vip);
    if (!infp->vsi_fship) {
        printk(KERN_ERR "vxfs: unable to get fsh inode\n");
        goto out_free_fship;
    }

    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

    tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
    if (!tip)
        goto out_free_pfp;

    infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip);
    if (!infp->vsi_stilist) {
        printk(KERN_ERR "vxfs: unable to get structural list inode\n");
        kfree(tip);
        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;
    }

    tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
    if (!tip)
        goto out_iput_stilist;
    infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip);
    if (!infp->vsi_ilist) {
        printk(KERN_ERR "vxfs: unable to get inode list inode\n");
        kfree(tip);
        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;
    }

    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;
 out_free_fship:
    kfree(vip);
    return -EINVAL;
}