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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.

 */

#ident "$Id: vxfs_fshead.c,v 1.1.1.1 2004-04-15 01:11:43 phoenix Exp $"

/*

 * Veritas filesystem driver - fileset header routines.

 */

#include <linux/fs.h>

#include <linux/kernel.h>

#include <linux/slab.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 (buffer_mapped(bp)) {

                struct vxfs_fsh         *fhp;

                if (!(fhp = kmalloc(sizeof(*fhp), SLAB_KERNEL)))

                        return NULL;

                memcpy(fhp, bp->b_data, sizeof(*fhp));

                brelse(bp);

                return (fhp);

        }

        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, *tip;

        if (!(vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino))) {

                printk(KERN_ERR "vxfs: unabled to read fsh inode\n");

                return -EINVAL;

        } else if (!VXFS_ISFSH(vip)) {

                printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",

                                vip->vii_mode & VXFS_TYPE_MASK);

                return -EINVAL;

        }

#ifdef DIAGNOSTIC

        printk("vxfs: fsh inode dump:\n");

        vxfs_dumpi(vip, infp->vsi_fshino);

#endif

        if (!(infp->vsi_fship = vxfs_get_fake_inode(sbp, vip))) {

                printk(KERN_ERR "vxfs: unabled to get fsh inode\n");

                return -EINVAL;

        }

        if (!(sfp = vxfs_getfsh(infp->vsi_fship, 0))) {

                printk(KERN_ERR "vxfs: unabled to get structural fsh\n");

                return -EINVAL;

        }

#ifdef DIAGNOSTIC

        vxfs_dumpfsh(sfp);

#endif

        if (!(pfp = vxfs_getfsh(infp->vsi_fship, 1))) {

                printk(KERN_ERR "vxfs: unabled to get primary fsh\n");

                return -EINVAL;

        }

#ifdef DIAGNOSTIC

        vxfs_dumpfsh(pfp);

#endif

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

        if (!tip || ((infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {

                printk(KERN_ERR "vxfs: unabled to get structual list inode\n");

                return -EINVAL;

        } else if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {

                printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",

                                VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);

                return -EINVAL;

        }

        tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);

        if (!tip || ((infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip)) == NULL)) {

                printk(KERN_ERR "vxfs: unabled to get inode list inode\n");

                return -EINVAL;

        } else 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);

                return -EINVAL;

        }

        return 0;

}