vxfs_inode.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 - inode routines.
 */
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/kernel.h>
#include <linux/slab.h>

#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"


struct kmem_cache       *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


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 (bp && buffer_mapped(bp)) {
        struct vxfs_inode_info  *vip;
        struct vxfs_dinode  *dip;

        if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, GFP_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;
}

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, GFP_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 ERR_CAST(pp);

fail:
    printk(KERN_WARNING "vxfs: unable to read inode %ld\n", (unsigned long)ino);
    vxfs_put_page(pp);
    return ERR_PTR(-ENOMEM);
}

struct vxfs_inode_info *
vxfs_stiget(struct super_block *sbp, ino_t ino)
{
    struct vxfs_inode_info *vip;

    vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_stilist);
    return IS_ERR(vip) ? NULL : vip;
}

static __inline__ umode_t
vxfs_transmod(struct vxfs_inode_info *vip)
{
    umode_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);
}

static void
vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
{

    ip->i_mode = vxfs_transmod(vip);
    i_uid_write(ip, (uid_t)vip->vii_uid);
    i_gid_write(ip, (gid_t)vip->vii_gid);

    set_nlink(ip, vip->vii_nlink);
    ip->i_size = vip->vii_size;

    ip->i_atime.tv_sec = vip->vii_atime;
    ip->i_ctime.tv_sec = vip->vii_ctime;
    ip->i_mtime.tv_sec = vip->vii_mtime;
    ip->i_atime.tv_nsec = 0;
    ip->i_ctime.tv_nsec = 0;
    ip->i_mtime.tv_nsec = 0;

    ip->i_blocks = vip->vii_blocks;
    ip->i_generation = vip->vii_gen;

    ip->i_private = vip;
    
}

struct inode *
vxfs_get_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
{
    struct inode            *ip = NULL;

    if ((ip = new_inode(sbp))) {
        ip->i_ino = get_next_ino();
        vxfs_iinit(ip, vip);
        ip->i_mapping->a_ops = &vxfs_aops;
    }
    return (ip);
}

void
vxfs_put_fake_inode(struct inode *ip)
{
    iput(ip);
}

struct inode *
vxfs_iget(struct super_block *sbp, ino_t ino)
{
    struct vxfs_inode_info      *vip;
    const struct address_space_operations   *aops;
    struct inode *ip;

    ip = iget_locked(sbp, ino);
    if (!ip)
        return ERR_PTR(-ENOMEM);
    if (!(ip->i_state & I_NEW))
        return ip;

    vip = __vxfs_iget(ino, VXFS_SBI(sbp)->vsi_ilist);
    if (IS_ERR(vip)) {
        iget_failed(ip);
        return ERR_CAST(vip);
    }

    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 = &generic_ro_fops;
        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;
            vip->vii_immed.vi_immed[ip->i_size] = '\0';
        }
    } else
        init_special_inode(ip, ip->i_mode, old_decode_dev(vip->vii_rdev));

    unlock_new_inode(ip);
    return ip;
}

static void vxfs_i_callback(struct rcu_head *head)
{
    struct inode *inode = container_of(head, struct inode, i_rcu);
    kmem_cache_free(vxfs_inode_cachep, inode->i_private);
}

void
vxfs_evict_inode(struct inode *ip)
{
    truncate_inode_pages(&ip->i_data, 0);
    clear_inode(ip);
    call_rcu(&ip->i_rcu, vxfs_i_callback);
}