inode.c

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/*
 *  linux/fs/ufs/inode.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <[email protected]>
 * Charles University, Faculty of Mathematics and Physics
 *
 *  from
 *
 *  linux/fs/ext2/inode.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Goal-directed block allocation by Stephen Tweedie ([email protected]), 1993
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller ([email protected]), 1995
 */

#include <asm/uaccess.h>

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>

#include "ufs_fs.h"
#include "ufs.h"
#include "swab.h"
#include "util.h"

static u64 ufs_frag_map(struct inode *inode, sector_t frag, bool needs_lock);

static int ufs_block_to_path(struct inode *inode, sector_t i_block, sector_t offsets[4])
{
    struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
    int ptrs = uspi->s_apb;
    int ptrs_bits = uspi->s_apbshift;
    const long direct_blocks = UFS_NDADDR,
        indirect_blocks = ptrs,
        double_blocks = (1 << (ptrs_bits * 2));
    int n = 0;


    UFSD("ptrs=uspi->s_apb = %d,double_blocks=%ld \n",ptrs,double_blocks);
    if (i_block < direct_blocks) {
        offsets[n++] = i_block;
    } else if ((i_block -= direct_blocks) < indirect_blocks) {
        offsets[n++] = UFS_IND_BLOCK;
        offsets[n++] = i_block;
    } else if ((i_block -= indirect_blocks) < double_blocks) {
        offsets[n++] = UFS_DIND_BLOCK;
        offsets[n++] = i_block >> ptrs_bits;
        offsets[n++] = i_block & (ptrs - 1);
    } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) {
        offsets[n++] = UFS_TIND_BLOCK;
        offsets[n++] = i_block >> (ptrs_bits * 2);
        offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1);
        offsets[n++] = i_block & (ptrs - 1);
    } else {
        ufs_warning(inode->i_sb, "ufs_block_to_path", "block > big");
    }
    return n;
}

/*
 * Returns the location of the fragment from
 * the beginning of the filesystem.
 */

static u64 ufs_frag_map(struct inode *inode, sector_t frag, bool needs_lock)
{
    struct ufs_inode_info *ufsi = UFS_I(inode);
    struct super_block *sb = inode->i_sb;
    struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
    u64 mask = (u64) uspi->s_apbmask>>uspi->s_fpbshift;
    int shift = uspi->s_apbshift-uspi->s_fpbshift;
    sector_t offsets[4], *p;
    int depth = ufs_block_to_path(inode, frag >> uspi->s_fpbshift, offsets);
    u64  ret = 0L;
    __fs32 block;
    __fs64 u2_block = 0L;
    unsigned flags = UFS_SB(sb)->s_flags;
    u64 temp = 0L;

    UFSD(": frag = %llu  depth = %d\n", (unsigned long long)frag, depth);
    UFSD(": uspi->s_fpbshift = %d ,uspi->s_apbmask = %x, mask=%llx\n",
        uspi->s_fpbshift, uspi->s_apbmask,
        (unsigned long long)mask);

    if (depth == 0)
        return 0;

    p = offsets;

    if (needs_lock)
        lock_ufs(sb);
    if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
        goto ufs2;

    block = ufsi->i_u1.i_data[*p++];
    if (!block)
        goto out;
    while (--depth) {
        struct buffer_head *bh;
        sector_t n = *p++;

        bh = sb_bread(sb, uspi->s_sbbase + fs32_to_cpu(sb, block)+(n>>shift));
        if (!bh)
            goto out;
        block = ((__fs32 *) bh->b_data)[n & mask];
        brelse (bh);
        if (!block)
            goto out;
    }
    ret = (u64) (uspi->s_sbbase + fs32_to_cpu(sb, block) + (frag & uspi->s_fpbmask));
    goto out;
ufs2:
    u2_block = ufsi->i_u1.u2_i_data[*p++];
    if (!u2_block)
        goto out;


    while (--depth) {
        struct buffer_head *bh;
        sector_t n = *p++;


        temp = (u64)(uspi->s_sbbase) + fs64_to_cpu(sb, u2_block);
        bh = sb_bread(sb, temp +(u64) (n>>shift));
        if (!bh)
            goto out;
        u2_block = ((__fs64 *)bh->b_data)[n & mask];
        brelse(bh);
        if (!u2_block)
            goto out;
    }
    temp = (u64)uspi->s_sbbase + fs64_to_cpu(sb, u2_block);
    ret = temp + (u64) (frag & uspi->s_fpbmask);

out:
    if (needs_lock)
        unlock_ufs(sb);
    return ret;
}

static struct buffer_head *
ufs_inode_getfrag(struct inode *inode, u64 fragment,
          sector_t new_fragment, unsigned int required, int *err,
          long *phys, int *new, struct page *locked_page)
{
    struct ufs_inode_info *ufsi = UFS_I(inode);
    struct super_block *sb = inode->i_sb;
    struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
    struct buffer_head * result;
    unsigned blockoff, lastblockoff;
    u64 tmp, goal, lastfrag, block, lastblock;
    void *p, *p2;

    UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, required %u, "
         "metadata %d\n", inode->i_ino, (unsigned long long)fragment,
         (unsigned long long)new_fragment, required, !phys);

        /* TODO : to be done for write support
        if ( (flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
             goto ufs2;
         */

    block = ufs_fragstoblks (fragment);
    blockoff = ufs_fragnum (fragment);
    p = ufs_get_direct_data_ptr(uspi, ufsi, block);

    goal = 0;

repeat:
    tmp = ufs_data_ptr_to_cpu(sb, p);

    lastfrag = ufsi->i_lastfrag;
    if (tmp && fragment < lastfrag) {
        if (!phys) {
            result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
            if (tmp == ufs_data_ptr_to_cpu(sb, p)) {
                UFSD("EXIT, result %llu\n",
                     (unsigned long long)tmp + blockoff);
                return result;
            }
            brelse (result);
            goto repeat;
        } else {
            *phys = uspi->s_sbbase + tmp + blockoff;
            return NULL;
        }
    }

    lastblock = ufs_fragstoblks (lastfrag);
    lastblockoff = ufs_fragnum (lastfrag);
    /*
     * We will extend file into new block beyond last allocated block
     */
    if (lastblock < block) {
        /*
         * We must reallocate last allocated block
         */
        if (lastblockoff) {
            p2 = ufs_get_direct_data_ptr(uspi, ufsi, lastblock);
            tmp = ufs_new_fragments(inode, p2, lastfrag,
                        ufs_data_ptr_to_cpu(sb, p2),
                        uspi->s_fpb - lastblockoff,
                        err, locked_page);
            if (!tmp) {
                if (lastfrag != ufsi->i_lastfrag)
                    goto repeat;
                else
                    return NULL;
            }
            lastfrag = ufsi->i_lastfrag;
            
        }
        tmp = ufs_data_ptr_to_cpu(sb,
                     ufs_get_direct_data_ptr(uspi, ufsi,
                                 lastblock));
        if (tmp)
            goal = tmp + uspi->s_fpb;
        tmp = ufs_new_fragments (inode, p, fragment - blockoff, 
                     goal, required + blockoff,
                     err,
                     phys != NULL ? locked_page : NULL);
    } else if (lastblock == block) {
    /*
     * We will extend last allocated block
     */
        tmp = ufs_new_fragments(inode, p, fragment -
                    (blockoff - lastblockoff),
                    ufs_data_ptr_to_cpu(sb, p),
                    required +  (blockoff - lastblockoff),
                    err, phys != NULL ? locked_page : NULL);
    } else /* (lastblock > block) */ {
    /*
     * We will allocate new block before last allocated block
     */
        if (block) {
            tmp = ufs_data_ptr_to_cpu(sb,
                         ufs_get_direct_data_ptr(uspi, ufsi, block - 1));
            if (tmp)
                goal = tmp + uspi->s_fpb;
        }
        tmp = ufs_new_fragments(inode, p, fragment - blockoff,
                    goal, uspi->s_fpb, err,
                    phys != NULL ? locked_page : NULL);
    }
    if (!tmp) {
        if ((!blockoff && ufs_data_ptr_to_cpu(sb, p)) ||
            (blockoff && lastfrag != ufsi->i_lastfrag))
            goto repeat;
        *err = -ENOSPC;
        return NULL;
    }

    if (!phys) {
        result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
    } else {
        *phys = uspi->s_sbbase + tmp + blockoff;
        result = NULL;
        *err = 0;
        *new = 1;
    }

    inode->i_ctime = CURRENT_TIME_SEC;
    if (IS_SYNC(inode))
        ufs_sync_inode (inode);
    mark_inode_dirty(inode);
    UFSD("EXIT, result %llu\n", (unsigned long long)tmp + blockoff);
    return result;

     /* This part : To be implemented ....
        Required only for writing, not required for READ-ONLY.
ufs2:

    u2_block = ufs_fragstoblks(fragment);
    u2_blockoff = ufs_fragnum(fragment);
    p = ufsi->i_u1.u2_i_data + block;
    goal = 0;

repeat2:
    tmp = fs32_to_cpu(sb, *p);
    lastfrag = ufsi->i_lastfrag;

     */
}

static struct buffer_head *
ufs_inode_getblock(struct inode *inode, struct buffer_head *bh,
          u64 fragment, sector_t new_fragment, int *err,
          long *phys, int *new, struct page *locked_page)
{
    struct super_block *sb = inode->i_sb;
    struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
    struct buffer_head * result;
    unsigned blockoff;
    u64 tmp, goal, block;
    void *p;

    block = ufs_fragstoblks (fragment);
    blockoff = ufs_fragnum (fragment);

    UFSD("ENTER, ino %lu, fragment %llu, new_fragment %llu, metadata %d\n",
         inode->i_ino, (unsigned long long)fragment,
         (unsigned long long)new_fragment, !phys);

    result = NULL;
    if (!bh)
        goto out;
    if (!buffer_uptodate(bh)) {
        ll_rw_block (READ, 1, &bh);
        wait_on_buffer (bh);
        if (!buffer_uptodate(bh))
            goto out;
    }
    if (uspi->fs_magic == UFS2_MAGIC)
        p = (__fs64 *)bh->b_data + block;
    else
        p = (__fs32 *)bh->b_data + block;
repeat:
    tmp = ufs_data_ptr_to_cpu(sb, p);
    if (tmp) {
        if (!phys) {
            result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
            if (tmp == ufs_data_ptr_to_cpu(sb, p))
                goto out;
            brelse (result);
            goto repeat;
        } else {
            *phys = uspi->s_sbbase + tmp + blockoff;
            goto out;
        }
    }

    if (block && (uspi->fs_magic == UFS2_MAGIC ?
              (tmp = fs64_to_cpu(sb, ((__fs64 *)bh->b_data)[block-1])) :
              (tmp = fs32_to_cpu(sb, ((__fs32 *)bh->b_data)[block-1]))))
        goal = tmp + uspi->s_fpb;
    else
        goal = bh->b_blocknr + uspi->s_fpb;
    tmp = ufs_new_fragments(inode, p, ufs_blknum(new_fragment), goal,
                uspi->s_fpb, err, locked_page);
    if (!tmp) {
        if (ufs_data_ptr_to_cpu(sb, p))
            goto repeat;
        goto out;
    }       


    if (!phys) {
        result = sb_getblk(sb, uspi->s_sbbase + tmp + blockoff);
    } else {
        *phys = uspi->s_sbbase + tmp + blockoff;
        *new = 1;
    }

    mark_buffer_dirty(bh);
    if (IS_SYNC(inode))
        sync_dirty_buffer(bh);
    inode->i_ctime = CURRENT_TIME_SEC;
    mark_inode_dirty(inode);
    UFSD("result %llu\n", (unsigned long long)tmp + blockoff);
out:
    brelse (bh);
    UFSD("EXIT\n");
    return result;
}

int ufs_getfrag_block(struct inode *inode, sector_t fragment, struct buffer_head *bh_result, int create)
{
    struct super_block * sb = inode->i_sb;
    struct ufs_sb_info * sbi = UFS_SB(sb);
    struct ufs_sb_private_info * uspi = sbi->s_uspi;
    struct buffer_head * bh;
    int ret, err, new;
    unsigned long ptr,phys;
    u64 phys64 = 0;
    bool needs_lock = (sbi->mutex_owner != current);
    
    if (!create) {
        phys64 = ufs_frag_map(inode, fragment, needs_lock);
        UFSD("phys64 = %llu\n", (unsigned long long)phys64);
        if (phys64)
            map_bh(bh_result, sb, phys64);
        return 0;
    }

        /* This code entered only while writing ....? */

    err = -EIO;
    new = 0;
    ret = 0;
    bh = NULL;

    if (needs_lock)
        lock_ufs(sb);

    UFSD("ENTER, ino %lu, fragment %llu\n", inode->i_ino, (unsigned long long)fragment);
    if (fragment >
        ((UFS_NDADDR + uspi->s_apb + uspi->s_2apb + uspi->s_3apb)
         << uspi->s_fpbshift))
        goto abort_too_big;

    err = 0;
    ptr = fragment;
      
    /*
     * ok, these macros clean the logic up a bit and make
     * it much more readable:
     */
#define GET_INODE_DATABLOCK(x) \
    ufs_inode_getfrag(inode, x, fragment, 1, &err, &phys, &new,\
              bh_result->b_page)
#define GET_INODE_PTR(x) \
    ufs_inode_getfrag(inode, x, fragment, uspi->s_fpb, &err, NULL, NULL,\
              bh_result->b_page)
#define GET_INDIRECT_DATABLOCK(x) \
    ufs_inode_getblock(inode, bh, x, fragment,  \
              &err, &phys, &new, bh_result->b_page)
#define GET_INDIRECT_PTR(x) \
    ufs_inode_getblock(inode, bh, x, fragment,  \
              &err, NULL, NULL, NULL)

    if (ptr < UFS_NDIR_FRAGMENT) {
        bh = GET_INODE_DATABLOCK(ptr);
        goto out;
    }
    ptr -= UFS_NDIR_FRAGMENT;
    if (ptr < (1 << (uspi->s_apbshift + uspi->s_fpbshift))) {
        bh = GET_INODE_PTR(UFS_IND_FRAGMENT + (ptr >> uspi->s_apbshift));
        goto get_indirect;
    }
    ptr -= 1 << (uspi->s_apbshift + uspi->s_fpbshift);
    if (ptr < (1 << (uspi->s_2apbshift + uspi->s_fpbshift))) {
        bh = GET_INODE_PTR(UFS_DIND_FRAGMENT + (ptr >> uspi->s_2apbshift));
        goto get_double;
    }
    ptr -= 1 << (uspi->s_2apbshift + uspi->s_fpbshift);
    bh = GET_INODE_PTR(UFS_TIND_FRAGMENT + (ptr >> uspi->s_3apbshift));
    bh = GET_INDIRECT_PTR((ptr >> uspi->s_2apbshift) & uspi->s_apbmask);
get_double:
    bh = GET_INDIRECT_PTR((ptr >> uspi->s_apbshift) & uspi->s_apbmask);
get_indirect:
    bh = GET_INDIRECT_DATABLOCK(ptr & uspi->s_apbmask);

#undef GET_INODE_DATABLOCK
#undef GET_INODE_PTR
#undef GET_INDIRECT_DATABLOCK
#undef GET_INDIRECT_PTR

out:
    if (err)
        goto abort;
    if (new)
        set_buffer_new(bh_result);
    map_bh(bh_result, sb, phys);
abort:
    if (needs_lock)
        unlock_ufs(sb);

    return err;

abort_too_big:
    ufs_warning(sb, "ufs_get_block", "block > big");
    goto abort;
}

static int ufs_writepage(struct page *page, struct writeback_control *wbc)
{
    return block_write_full_page(page,ufs_getfrag_block,wbc);
}

static int ufs_readpage(struct file *file, struct page *page)
{
    return block_read_full_page(page,ufs_getfrag_block);
}

int ufs_prepare_chunk(struct page *page, loff_t pos, unsigned len)
{
    return __block_write_begin(page, pos, len, ufs_getfrag_block);
}

static int ufs_write_begin(struct file *file, struct address_space *mapping,
            loff_t pos, unsigned len, unsigned flags,
            struct page **pagep, void **fsdata)
{
    int ret;

    ret = block_write_begin(mapping, pos, len, flags, pagep,
                ufs_getfrag_block);
    if (unlikely(ret)) {
        loff_t isize = mapping->host->i_size;
        if (pos + len > isize)
            vmtruncate(mapping->host, isize);
    }

    return ret;
}

static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
{
    return generic_block_bmap(mapping,block,ufs_getfrag_block);
}

const struct address_space_operations ufs_aops = {
    .readpage = ufs_readpage,
    .writepage = ufs_writepage,
    .write_begin = ufs_write_begin,
    .write_end = generic_write_end,
    .bmap = ufs_bmap
};

static void ufs_set_inode_ops(struct inode *inode)
{
    if (S_ISREG(inode->i_mode)) {
        inode->i_op = &ufs_file_inode_operations;
        inode->i_fop = &ufs_file_operations;
        inode->i_mapping->a_ops = &ufs_aops;
    } else if (S_ISDIR(inode->i_mode)) {
        inode->i_op = &ufs_dir_inode_operations;
        inode->i_fop = &ufs_dir_operations;
        inode->i_mapping->a_ops = &ufs_aops;
    } else if (S_ISLNK(inode->i_mode)) {
        if (!inode->i_blocks)
            inode->i_op = &ufs_fast_symlink_inode_operations;
        else {
            inode->i_op = &ufs_symlink_inode_operations;
            inode->i_mapping->a_ops = &ufs_aops;
        }
    } else
        init_special_inode(inode, inode->i_mode,
                   ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
}

static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
{
    struct ufs_inode_info *ufsi = UFS_I(inode);
    struct super_block *sb = inode->i_sb;
    umode_t mode;

    /*
     * Copy data to the in-core inode.
     */
    inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
    set_nlink(inode, fs16_to_cpu(sb, ufs_inode->ui_nlink));
    if (inode->i_nlink == 0) {
        ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
        return -1;
    }
    
    /*
     * Linux now has 32-bit uid and gid, so we can support EFT.
     */
    i_uid_write(inode, ufs_get_inode_uid(sb, ufs_inode));
    i_gid_write(inode, ufs_get_inode_gid(sb, ufs_inode));

    inode->i_size = fs64_to_cpu(sb, ufs_inode->ui_size);
    inode->i_atime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_atime.tv_sec);
    inode->i_ctime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_ctime.tv_sec);
    inode->i_mtime.tv_sec = fs32_to_cpu(sb, ufs_inode->ui_mtime.tv_sec);
    inode->i_mtime.tv_nsec = 0;
    inode->i_atime.tv_nsec = 0;
    inode->i_ctime.tv_nsec = 0;
    inode->i_blocks = fs32_to_cpu(sb, ufs_inode->ui_blocks);
    inode->i_generation = fs32_to_cpu(sb, ufs_inode->ui_gen);
    ufsi->i_flags = fs32_to_cpu(sb, ufs_inode->ui_flags);
    ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
    ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);

    
    if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
        memcpy(ufsi->i_u1.i_data, &ufs_inode->ui_u2.ui_addr,
               sizeof(ufs_inode->ui_u2.ui_addr));
    } else {
        memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
               sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
        ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
    }
    return 0;
}

static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
{
    struct ufs_inode_info *ufsi = UFS_I(inode);
    struct super_block *sb = inode->i_sb;
    umode_t mode;

    UFSD("Reading ufs2 inode, ino %lu\n", inode->i_ino);
    /*
     * Copy data to the in-core inode.
     */
    inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
    set_nlink(inode, fs16_to_cpu(sb, ufs2_inode->ui_nlink));
    if (inode->i_nlink == 0) {
        ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
        return -1;
    }

        /*
         * Linux now has 32-bit uid and gid, so we can support EFT.
         */
    i_uid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_uid));
    i_gid_write(inode, fs32_to_cpu(sb, ufs2_inode->ui_gid));

    inode->i_size = fs64_to_cpu(sb, ufs2_inode->ui_size);
    inode->i_atime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_atime);
    inode->i_ctime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_ctime);
    inode->i_mtime.tv_sec = fs64_to_cpu(sb, ufs2_inode->ui_mtime);
    inode->i_atime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_atimensec);
    inode->i_ctime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_ctimensec);
    inode->i_mtime.tv_nsec = fs32_to_cpu(sb, ufs2_inode->ui_mtimensec);
    inode->i_blocks = fs64_to_cpu(sb, ufs2_inode->ui_blocks);
    inode->i_generation = fs32_to_cpu(sb, ufs2_inode->ui_gen);
    ufsi->i_flags = fs32_to_cpu(sb, ufs2_inode->ui_flags);
    /*
    ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
    ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
    */

    if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
        memcpy(ufsi->i_u1.u2_i_data, &ufs2_inode->ui_u2.ui_addr,
               sizeof(ufs2_inode->ui_u2.ui_addr));
    } else {
        memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
               sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
        ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
    }
    return 0;
}

struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
{
    struct ufs_inode_info *ufsi;
    struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
    struct buffer_head * bh;
    struct inode *inode;
    int err;

    UFSD("ENTER, ino %lu\n", ino);

    if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
        ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
                ino);
        return ERR_PTR(-EIO);
    }

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

    ufsi = UFS_I(inode);

    bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
    if (!bh) {
        ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
                inode->i_ino);
        goto bad_inode;
    }
    if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
        struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;

        err = ufs2_read_inode(inode,
                      ufs2_inode + ufs_inotofsbo(inode->i_ino));
    } else {
        struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;

        err = ufs1_read_inode(inode,
                      ufs_inode + ufs_inotofsbo(inode->i_ino));
    }

    if (err)
        goto bad_inode;
    inode->i_version++;
    ufsi->i_lastfrag =
        (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
    ufsi->i_dir_start_lookup = 0;
    ufsi->i_osync = 0;

    ufs_set_inode_ops(inode);

    brelse(bh);

    UFSD("EXIT\n");
    unlock_new_inode(inode);
    return inode;

bad_inode:
    iget_failed(inode);
    return ERR_PTR(-EIO);
}

static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
{
    struct super_block *sb = inode->i_sb;
    struct ufs_inode_info *ufsi = UFS_I(inode);

    ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
    ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);

    ufs_set_inode_uid(sb, ufs_inode, i_uid_read(inode));
    ufs_set_inode_gid(sb, ufs_inode, i_gid_read(inode));
        
    ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
    ufs_inode->ui_atime.tv_sec = cpu_to_fs32(sb, inode->i_atime.tv_sec);
    ufs_inode->ui_atime.tv_usec = 0;
    ufs_inode->ui_ctime.tv_sec = cpu_to_fs32(sb, inode->i_ctime.tv_sec);
    ufs_inode->ui_ctime.tv_usec = 0;
    ufs_inode->ui_mtime.tv_sec = cpu_to_fs32(sb, inode->i_mtime.tv_sec);
    ufs_inode->ui_mtime.tv_usec = 0;
    ufs_inode->ui_blocks = cpu_to_fs32(sb, inode->i_blocks);
    ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
    ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);

    if ((UFS_SB(sb)->s_flags & UFS_UID_MASK) == UFS_UID_EFT) {
        ufs_inode->ui_u3.ui_sun.ui_shadow = cpu_to_fs32(sb, ufsi->i_shadow);
        ufs_inode->ui_u3.ui_sun.ui_oeftflag = cpu_to_fs32(sb, ufsi->i_oeftflag);
    }

    if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
        /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
        ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.i_data[0];
    } else if (inode->i_blocks) {
        memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.i_data,
               sizeof(ufs_inode->ui_u2.ui_addr));
    }
    else {
        memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
               sizeof(ufs_inode->ui_u2.ui_symlink));
    }

    if (!inode->i_nlink)
        memset (ufs_inode, 0, sizeof(struct ufs_inode));
}

static void ufs2_update_inode(struct inode *inode, struct ufs2_inode *ufs_inode)
{
    struct super_block *sb = inode->i_sb;
    struct ufs_inode_info *ufsi = UFS_I(inode);

    UFSD("ENTER\n");
    ufs_inode->ui_mode = cpu_to_fs16(sb, inode->i_mode);
    ufs_inode->ui_nlink = cpu_to_fs16(sb, inode->i_nlink);

    ufs_inode->ui_uid = cpu_to_fs32(sb, i_uid_read(inode));
    ufs_inode->ui_gid = cpu_to_fs32(sb, i_gid_read(inode));

    ufs_inode->ui_size = cpu_to_fs64(sb, inode->i_size);
    ufs_inode->ui_atime = cpu_to_fs64(sb, inode->i_atime.tv_sec);
    ufs_inode->ui_atimensec = cpu_to_fs32(sb, inode->i_atime.tv_nsec);
    ufs_inode->ui_ctime = cpu_to_fs64(sb, inode->i_ctime.tv_sec);
    ufs_inode->ui_ctimensec = cpu_to_fs32(sb, inode->i_ctime.tv_nsec);
    ufs_inode->ui_mtime = cpu_to_fs64(sb, inode->i_mtime.tv_sec);
    ufs_inode->ui_mtimensec = cpu_to_fs32(sb, inode->i_mtime.tv_nsec);

    ufs_inode->ui_blocks = cpu_to_fs64(sb, inode->i_blocks);
    ufs_inode->ui_flags = cpu_to_fs32(sb, ufsi->i_flags);
    ufs_inode->ui_gen = cpu_to_fs32(sb, inode->i_generation);

    if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
        /* ufs_inode->ui_u2.ui_addr.ui_db[0] = cpu_to_fs32(sb, inode->i_rdev); */
        ufs_inode->ui_u2.ui_addr.ui_db[0] = ufsi->i_u1.u2_i_data[0];
    } else if (inode->i_blocks) {
        memcpy(&ufs_inode->ui_u2.ui_addr, ufsi->i_u1.u2_i_data,
               sizeof(ufs_inode->ui_u2.ui_addr));
    } else {
        memcpy(&ufs_inode->ui_u2.ui_symlink, ufsi->i_u1.i_symlink,
               sizeof(ufs_inode->ui_u2.ui_symlink));
    }

    if (!inode->i_nlink)
        memset (ufs_inode, 0, sizeof(struct ufs2_inode));
    UFSD("EXIT\n");
}

static int ufs_update_inode(struct inode * inode, int do_sync)
{
    struct super_block *sb = inode->i_sb;
    struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
    struct buffer_head * bh;

    UFSD("ENTER, ino %lu\n", inode->i_ino);

    if (inode->i_ino < UFS_ROOTINO ||
        inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
        ufs_warning (sb, "ufs_read_inode", "bad inode number (%lu)\n", inode->i_ino);
        return -1;
    }

    bh = sb_bread(sb, ufs_inotofsba(inode->i_ino));
    if (!bh) {
        ufs_warning (sb, "ufs_read_inode", "unable to read inode %lu\n", inode->i_ino);
        return -1;
    }
    if (uspi->fs_magic == UFS2_MAGIC) {
        struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;

        ufs2_update_inode(inode,
                  ufs2_inode + ufs_inotofsbo(inode->i_ino));
    } else {
        struct ufs_inode *ufs_inode = (struct ufs_inode *) bh->b_data;

        ufs1_update_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
    }
        
    mark_buffer_dirty(bh);
    if (do_sync)
        sync_dirty_buffer(bh);
    brelse (bh);
    
    UFSD("EXIT\n");
    return 0;
}

int ufs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
    int ret;
    lock_ufs(inode->i_sb);
    ret = ufs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
    unlock_ufs(inode->i_sb);
    return ret;
}

int ufs_sync_inode (struct inode *inode)
{
    return ufs_update_inode (inode, 1);
}

void ufs_evict_inode(struct inode * inode)
{
    int want_delete = 0;

    if (!inode->i_nlink && !is_bad_inode(inode))
        want_delete = 1;

    truncate_inode_pages(&inode->i_data, 0);
    if (want_delete) {
        loff_t old_i_size;
        /*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
        lock_ufs(inode->i_sb);
        mark_inode_dirty(inode);
        ufs_update_inode(inode, IS_SYNC(inode));
        old_i_size = inode->i_size;
        inode->i_size = 0;
        if (inode->i_blocks && ufs_truncate(inode, old_i_size))
            ufs_warning(inode->i_sb, __func__, "ufs_truncate failed\n");
        unlock_ufs(inode->i_sb);
    }

    invalidate_inode_buffers(inode);
    clear_inode(inode);

    if (want_delete) {
        lock_ufs(inode->i_sb);
        ufs_free_inode (inode);
        unlock_ufs(inode->i_sb);
    }
}