On Wed, Nov 28, 2007 at 05:11:02PM -0800, Christoph Lameter wrote:
> @@ -914,10 +914,11 @@ struct buffer_head *alloc_page_buffers(s
> {
> struct buffer_head *bh, *head;
> long offset;
> + unsigned int page_size = page_cache_size(page->mapping);
>
> try_again:
> head = NULL;
> - offset = PAGE_SIZE;
> + offset = page_size;
> while ((offset -= size) >= 0) {
> bh = alloc_buffer_head(GFP_NOFS);
> if (!bh)
We don't really need a temporary variable here....
> lblock = (i_size_read(inode)+blocksize-1) >> inode->i_blkbits;
> bh = head;
> nr = 0;
> @@ -2213,16 +2218,16 @@ int cont_expand_zero(struct file *file,
> unsigned zerofrom, offset, len;
> int err = 0;
>
> - index = pos >> PAGE_CACHE_SHIFT;
> - offset = pos & ~PAGE_CACHE_MASK;
> + index = page_cache_index(mapping, pos);
> + offset = page_cache_offset(mapping, pos);
>
> - while (index > (curidx = (curpos = *bytes)>>PAGE_CACHE_SHIFT)) {
> - zerofrom = curpos & ~PAGE_CACHE_MASK;
> + while (index > (curidx = page_cache_index(mapping, (curpos = *bytes))))
> {
> + zerofrom = page_cache_offset(mapping, curpos);
That doesn't get any prettier. Perhaps:
while (index > (curidx = page_cache_index(mapping, *bytes))) {
curpos = *bytes;
zerofrom = page_cache_offset(mapping, curpos);
> @@ -2356,20 +2362,22 @@ block_page_mkwrite(struct vm_area_struct
> unsigned long end;
> loff_t size;
> int ret = -EINVAL;
> + struct address_space *mapping;
>
> lock_page(page);
> + mapping = page->mapping;
> size = i_size_read(inode);
> - if ((page->mapping != inode->i_mapping) ||
> + if ((mapping != inode->i_mapping) ||
> (page_offset(page) > size)) {
Should check (page_cache_pos(mapping, page->index, 0) > size)
> @@ -2607,9 +2616,10 @@ EXPORT_SYMBOL(nobh_write_end);
> int nobh_writepage(struct page *page, get_block_t *get_block,
> struct writeback_control *wbc)
> {
> - struct inode * const inode = page->mapping->host;
> + struct address_space *mapping = page->mapping;
> + struct inode * const inode = mapping->host;
> loff_t i_size = i_size_read(inode);
> - const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
> + const pgoff_t end_index = page_cache_offset(mapping, i_size);
const pgoff_t end_index = page_cache_index(mapping, i_size);
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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