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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_inode.c,v 1.1.1.1 2004-04-15 01:11:43 phoenix Exp $"

/*

 * Veritas filesystem driver - inode routines.

 */

#include <linux/fs.h>

#include <linux/pagemap.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include "vxfs.h"

#include "vxfs_inode.h"

#include "vxfs_extern.h"

extern struct address_space_operations vxfs_aops;

extern struct address_space_operations vxfs_immed_aops;

extern struct inode_operations vxfs_immed_symlink_iops;

static struct file_operations vxfs_file_operations = {

        .open =                 generic_file_open,

        .llseek =               generic_file_llseek,

        .read =                 generic_file_read,

        .mmap =                 generic_file_mmap,

};

kmem_cache_t            *vxfs_inode_cachep;

#ifdef DIAGNOSTIC

/*

 * Dump inode contents (partially).

 */

void

vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)

{

        printk(KERN_DEBUG "\n\n");

        if (ino)

                printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);

        else

                printk(KERN_DEBUG "dumping unknown vxfs inode\n");

        printk(KERN_DEBUG "---------------------------\n");

        printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);

        printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",

                        vip->vii_nlink, vip->vii_uid, vip->vii_gid);

        printk(KERN_DEBUG "size:%Lx, blocks:%u\n",

                        vip->vii_size, vip->vii_blocks);

        printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);

}

#endif

/**

 * vxfs_blkiget - find inode based on extent #

 * @sbp:        superblock of the filesystem we search in

 * @extent:     number of the extent to search

 * @ino:        inode number to search

 *

 * Description:

 *  vxfs_blkiget searches inode @ino in the filesystem described by

 *  @sbp in the extent @extent.

 *  Returns the matching VxFS inode on success, else a NULL pointer.

 *

 * NOTE:

 *  While __vxfs_iget uses the pagecache vxfs_blkiget uses the

 *  buffercache.  This function should not be used outside the

 *  read_super() method, otherwise the data may be incoherent.

 */

struct vxfs_inode_info *

vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)

{

        struct buffer_head              *bp;

        u_long                          block, offset;

        block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);

        offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);

        bp = sb_bread(sbp, block);

        if (buffer_mapped(bp)) {

                struct vxfs_inode_info  *vip;

                struct vxfs_dinode      *dip;

                if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))

                        goto fail;

                dip = (struct vxfs_dinode *)(bp->b_data + offset);

                memcpy(vip, dip, sizeof(*vip));

#ifdef DIAGNOSTIC

                vxfs_dumpi(vip, ino);

#endif

                brelse(bp);

                return (vip);

        }

fail:

        printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);

        brelse(bp);

        return NULL;

}

/**

 * __vxfs_iget - generic find inode facility

 * @sbp:                VFS superblock

 * @ino:                inode number

 * @ilistp:             inode list

 *

 * Description:

 *  Search the for inode number @ino in the filesystem

 *  described by @sbp.  Use the specified inode table (@ilistp).

 *  Returns the matching VxFS inode on success, else a NULL pointer.

 */

static struct vxfs_inode_info *

__vxfs_iget(ino_t ino, struct inode *ilistp)

{

        struct page                     *pp;

        u_long                          offset;

        offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;

        pp = vxfs_get_page(ilistp->i_mapping, ino * VXFS_ISIZE / PAGE_SIZE);

        if (!IS_ERR(pp)) {

                struct vxfs_inode_info  *vip;

                struct vxfs_dinode      *dip;

                caddr_t                 kaddr = (char *)page_address(pp);

                if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))

                        goto fail;

                dip = (struct vxfs_dinode *)(kaddr + offset);

                memcpy(vip, dip, sizeof(*vip));

#ifdef DIAGNOSTIC

                vxfs_dumpi(vip, ino);

#endif

                vxfs_put_page(pp);

                return (vip);

        }

        printk(KERN_WARNING "vxfs: error on page %p\n", pp);

        return NULL;

fail:

        printk(KERN_WARNING "vxfs: unable to read inode %ld\n", ino);

        vxfs_put_page(pp);

        return NULL;

}

/**

 * vxfs_stiget - find inode using the structural inode list

 * @sbp:        VFS superblock

 * @ino:        inode #

 *

 * Description:

 *  Find inode @ino in the filesystem described by @sbp using

 *  the structural inode list.

 *  Returns the matching VxFS inode on success, else a NULL pointer.

 */

struct vxfs_inode_info *

vxfs_stiget(struct super_block *sbp, ino_t ino)

{

        return __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);

}

/**

 * vxfs_transmod - mode for a VxFS inode

 * @vip:        VxFS inode

 *

 * Description:

 *  vxfs_transmod returns a Linux mode_t for a given

 *  VxFS inode structure.

 */

static __inline__ mode_t

vxfs_transmod(struct vxfs_inode_info *vip)

{

        mode_t                  ret = vip->vii_mode & ~VXFS_TYPE_MASK;

        if (VXFS_ISFIFO(vip))

                ret |= S_IFIFO;

        if (VXFS_ISCHR(vip))

                ret |= S_IFCHR;

        if (VXFS_ISDIR(vip))

                ret |= S_IFDIR;

        if (VXFS_ISBLK(vip))

                ret |= S_IFBLK;

        if (VXFS_ISLNK(vip))

                ret |= S_IFLNK;

        if (VXFS_ISREG(vip))

                ret |= S_IFREG;

        if (VXFS_ISSOC(vip))

                ret |= S_IFSOCK;

        return (ret);

}

/**

 * vxfs_iinit- helper to fill inode fields

 * @ip:         VFS inode

 * @vip:        VxFS inode

 *

 * Description:

 *  vxfs_instino is a helper function to fill in all relevant

 *  fields in @ip from @vip.

 */

static void

vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)

{

        ip->i_mode = vxfs_transmod(vip);

        ip->i_uid = (uid_t)vip->vii_uid;

        ip->i_gid = (gid_t)vip->vii_gid;

        ip->i_nlink = vip->vii_nlink;

        ip->i_size = vip->vii_size;

        ip->i_atime = vip->vii_atime;

        ip->i_ctime = vip->vii_ctime;

        ip->i_mtime = vip->vii_mtime;

        ip->i_blksize = PAGE_SIZE;

        ip->i_blocks = vip->vii_blocks;

        ip->i_generation = vip->vii_gen;

        ip->u.generic_ip = (void *)vip;

}

/**

 * vxfs_get_fake_inode - get fake inode structure

 * @sbp:                filesystem superblock

 * @vip:                fspriv inode

 *

 * Description:

 *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a

 *  superblock, vxfs_inode pair.

 *  Returns the filled VFS inode.

 */

struct inode *

vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)

{

        struct inode                    *ip = NULL;

        if ((ip = new_inode(sbp))) {

                vxfs_iinit(ip, vip);

                ip->i_mapping->a_ops = &vxfs_aops;

        }

        return (ip);

}

/**

 * vxfs_put_fake_inode - free faked inode

 * *ip:                 VFS inode

 *

 * Description:

 *  vxfs_put_fake_inode frees all data asssociated with @ip.

 */

void

vxfs_put_fake_inode(struct inode *ip)

{

        iput(ip);

}

/**

 * vxfs_read_inode - fill in inode information

 * @ip:         inode pointer to fill

 *

 * Description:

 *  vxfs_read_inode reads the disk inode for @ip and fills

 *  in all relevant fields in @ip.

 */

void

vxfs_read_inode(struct inode *ip)

{

        struct super_block              *sbp = ip->i_sb;

        struct vxfs_inode_info          *vip;

        struct address_space_operations *aops;

        ino_t                           ino = ip->i_ino;

        if (!(vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist)))

                return;

        vxfs_iinit(ip, vip);

        if (VXFS_ISIMMED(vip))

                aops = &vxfs_immed_aops;

        else

                aops = &vxfs_aops;

        if (S_ISREG(ip->i_mode)) {

                ip->i_fop = &vxfs_file_operations;

                ip->i_mapping->a_ops = aops;

        } else if (S_ISDIR(ip->i_mode)) {

                ip->i_op = &vxfs_dir_inode_ops;

                ip->i_fop = &vxfs_dir_operations;

                ip->i_mapping->a_ops = aops;

        } else if (S_ISLNK(ip->i_mode)) {

                if (!VXFS_ISIMMED(vip)) {

                        ip->i_op = &page_symlink_inode_operations;

                        ip->i_mapping->a_ops = &vxfs_aops;

                } else

                        ip->i_op = &vxfs_immed_symlink_iops;

        } else

                init_special_inode(ip, ip->i_mode, vip->vii_rdev);

        return;

}

/**

 * vxfs_put_inode - remove inode from main memory

 * @ip:         inode to discard.

 *

 * Description:

 *  vxfs_put_inode() is called on each iput.  If we are the last

 *  link in memory, free the fspriv inode area.

 */

void

vxfs_put_inode(struct inode *ip)

{

        if (atomic_read(&ip->i_count) == 1)

                kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);

}