lustre/kernel_patches/patches/ext3-san-jdike-2.6-suse.patch

   1  fs/ext3/inode.c |   81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   2  fs/ext3/super.c |    4 ++
   3  2 files changed, 85 insertions(+)
   4
   5 --- linux-2.5.73/fs/ext3/inode.c~ext3-san-jdike-2.5.73  2003-06-22 12:32:58.000000000 -0600
   6 +++ linux-2.5.73-braam/fs/ext3/inode.c  2003-06-30 12:19:21.000000000 -0600
   7 @@ -2945,3 +2945,84 @@ int ext3_change_inode_journal_flag(struc
   8
   9         return err;
  10  }
  11 +
  12 +/* for each block: 1 ind + 1 dind + 1 tind
  13 + * for each block: 3 bitmap blocks
  14 + * for each block: 3 group descriptor blocks
  15 + * i inode block
  16 + * 1 superblock
  17 + * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quote files
  18 + * ((1+1+1) * 3 * nblocks) + 1 + 1 + 2 * EXT3_SINGLEDATA_TRANS_BLOCKS
  19 + *
  20 + * XXX assuming:
  21 + * (1) fs logic block size == page size
  22 + * (2) ext3 in writeback mode
  23 + */
  24 +static inline int ext3_san_write_trans_blocks(int nblocks)
  25 +{
  26 +       int ret;
  27 +
  28 +       ret = (1 + 1 + 1) * 3 * nblocks + 1 + 1;
  29 +
  30 +#ifdef CONFIG_QUOTA
  31 +       ret += 2 * EXT3_SINGLEDATA_TRANS_BLOCKS;
  32 +#endif
  33 +
  34 +       return ret;
  35 +}
  36 +
  37 +/* Alloc blocks for an inode, while don't create any buffer/page
  38 + * for data I/O; set the inode size if file is extended.
  39 + *
  40 + * @inode:    target inode
  41 + * @blocks:   array of logic block number
  42 + * @nblocks:  how many blocks need be alloced
  43 + * @newsize:  new filesize we should set
  44 + *
  45 + * return:    0 success, otherwise failed
  46 + *            (*blocks) contains physical block number alloced
  47 + *
  48 + * XXX this assume the fs block size == page size
  49 + */
  50 +int ext3_prep_san_write(struct inode *inode, long *blocks,
  51 +                       int nblocks, loff_t newsize)
  52 +{
  53 +       handle_t *handle;
  54 +       struct buffer_head bh_tmp;
  55 +       int needed_blocks;
  56 +       int i, ret = 0, ret2;
  57 +
  58 +       needed_blocks = ext3_san_write_trans_blocks(nblocks);
  59 +
  60 +       lock_kernel();
  61 +       handle = ext3_journal_start(inode, needed_blocks);
  62 +       if (IS_ERR(handle)) {
  63 +               unlock_kernel();
  64 +               return PTR_ERR(handle);
  65 +       }
  66 +       unlock_kernel();
  67 +
  68 +       /* alloc blocks one by one */
  69 +       for (i = 0; i < nblocks; i++) {
  70 +               ret = ext3_get_block_handle(handle, inode, blocks[i],
  71 +                                               &bh_tmp, 1, 1);
  72 +               if (ret)
  73 +                       break;
  74 +
  75 +               blocks[i] = bh_tmp.b_blocknr;
  76 +       }
  77 +
  78 +       /* set inode size if needed */
  79 +       if (!ret && (newsize > inode->i_size)) {
  80 +               inode->i_size = newsize;
  81 +               ext3_mark_inode_dirty(handle, inode);
  82 +       }
  83 +
  84 +       lock_kernel();
  85 +       ret2 = ext3_journal_stop(handle);
  86 +       unlock_kernel();
  87 +
  88 +       if (!ret)
  89 +               ret = ret2;
  90 +       return ret;
  91 +}
  92 --- linux-2.5.73/fs/ext3/super.c~ext3-san-jdike-2.5.73  2003-06-22 12:33:16.000000000 -0600
  93 +++ linux-2.5.73-braam/fs/ext3/super.c  2003-06-30 12:16:36.000000000 -0600
  94 @@ -2080,6 +2080,10 @@ static void __exit exit_ext3_fs(void)
  95         exit_ext3_xattr();
  96  }
  97
  98 +int ext3_prep_san_write(struct inode *inode, long *blocks,
  99 +                        int nblocks, loff_t newsize);
 100 +EXPORT_SYMBOL(ext3_prep_san_write);
 101 +
 102  MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
 103  MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
 104  MODULE_LICENSE("GPL");
 105
 106 _