lustre/kernel_patches/patches/ext3-map_inode_page.patch

   1
   2
   3
   4  fs/ext3/ext3-exports.c |    3 ++
   5  fs/ext3/inode.c        |   55 +++++++++++++++++++++++++++++++++++++++++++++++++
   6  2 files changed, 58 insertions(+)
   7
   8 --- linux-2.4.20-l18/fs/ext3/inode.c~ext3-map_inode_page        Tue Jul  8 20:07:23 2003
   9 +++ linux-2.4.20-l18-phil/fs/ext3/inode.c       Wed Jul  9 03:56:41 2003
  10 @@ -2867,3 +2867,58 @@ int ext3_prep_san_write(struct inode *in
  11                 ret = ret2;
  12         return ret;
  13  }
  14 +
  15 +int ext3_map_inode_page(struct inode *inode, struct page *page,
  16 +                        unsigned long *blocks, int *created, int create)
  17 +{
  18 +        unsigned int blocksize, blocks_per_page;
  19 +        unsigned long iblock;
  20 +        struct buffer_head dummy;
  21 +        void *handle;
  22 +        int i, rc = 0, failed = 0, needed_blocks;
  23 +
  24 +        blocksize = inode->i_sb->s_blocksize;
  25 +        blocks_per_page = PAGE_SIZE >> inode->i_sb->s_blocksize_bits;
  26 +        iblock = page->index >> (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
  27 +
  28 +        for (i = 0; i < blocks_per_page; i++, iblock++) {
  29 +                blocks[i] = ext3_bmap(inode->i_mapping, iblock);
  30 +                if (blocks[i] == 0) {
  31 +                        failed++;
  32 +                        created[i] = -1;
  33 +                } else {
  34 +                        created[i] = 0;
  35 +                }
  36 +        }
  37 +
  38 +        if (failed == 0 || create == 0)
  39 +                return 0;
  40 +
  41 +        needed_blocks = ext3_writepage_trans_blocks(inode) * failed;
  42 +        lock_kernel();
  43 +        handle = ext3_journal_start(inode, needed_blocks);
  44 +        unlock_kernel();
  45 +        if (IS_ERR(handle))
  46 +                return PTR_ERR(handle);
  47 +
  48 +        iblock = page->index >> (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
  49 +        for (i = 0; i < blocks_per_page; i++, iblock++) {
  50 +                if (blocks[i] != 0)
  51 +                        continue;
  52 +
  53 +                rc = ext3_get_block_handle(handle, inode, iblock, &dummy, 1);
  54 +                if (rc) {
  55 +                        printk(KERN_INFO "ext3_map_inode_page: error reading "
  56 +                               "block %ld\n", iblock);
  57 +                        goto out;
  58 +                }
  59 +                blocks[i] = dummy.b_blocknr;
  60 +                created[i] = 1;
  61 +        }
  62 +
  63 + out:
  64 +       lock_kernel();
  65 +       ext3_journal_stop(handle, inode);
  66 +       unlock_kernel();
  67 +        return rc;
  68 +}
  69 --- linux-2.4.20-l18/fs/ext3/ext3-exports.c~ext3-map_inode_page Tue Jul  8 20:07:10 2003
  70 +++ linux-2.4.20-l18-phil/fs/ext3/ext3-exports.c        Tue Jul  8 20:09:02 2003
  71 @@ -9,6 +9,8 @@
  72
  73  int ext3_prep_san_write(struct inode *inode, long *blocks,
  74                         int nblocks, loff_t newsize);
  75 +int ext3_map_inode_page(struct inode *inode, struct page *page,
  76 +                        unsigned long *block, int *created, int create);
  77
  78  EXPORT_SYMBOL(ext3_force_commit);
  79  EXPORT_SYMBOL(ext3_bread);
  80 @@ -18,3 +20,4 @@ EXPORT_SYMBOL(ext3_xattr_get);
  81  EXPORT_SYMBOL(ext3_xattr_list);
  82  EXPORT_SYMBOL(ext3_xattr_set);
  83  EXPORT_SYMBOL(ext3_prep_san_write);
  84 +EXPORT_SYMBOL(ext3_map_inode_page);