[patch 12/14] Use page_cache_xxx in mm/mpage.c

clameter
2007-06-14T19:45:38Z

[-- Attachment #1: vps_fs_mpage --]
[-- Type: text/plain, Size: 4096 bytes --]

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
fs/mpage.c | 28 ++++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)

Index: vps/fs/mpage.c
===================================================================
--- vps.orig/fs/mpage.c 2007-06-11 22:33:07.000000000 -0700
+++ vps/fs/mpage.c 2007-06-11 22:37:24.000000000 -0700
@@ -133,7 +133,8 @@ mpage_alloc(struct block_device *bdev,
static void
map_buffer_to_page(struct page *page, struct buffer_head *bh, int page_block)
{
- struct inode *inode = page->mapping->host;
+ struct address_space *mapping = page->mapping;
+ struct inode *inode = mapping->host;
struct buffer_head *page_bh, *head;
int block = 0;

@@ -142,9 +143,9 @@ map_buffer_to_page(struct page *page, st
* don't make any buffers if there is only one buffer on
* the page and the page just needs to be set up to date
*/
- if (inode->i_blkbits == PAGE_CACHE_SHIFT &&
+ if (inode->i_blkbits == page_cache_shift(mapping) &&
buffer_uptodate(bh)) {
- SetPageUptodate(page);
+ SetPageUptodate(page);
return;
}
create_empty_buffers(page, 1 << inode->i_blkbits, 0);
@@ -177,9 +178,10 @@ do_mpage_readpage(struct bio *bio, struc
sector_t *last_block_in_bio, struct buffer_head *map_bh,
unsigned long *first_logical_block, get_block_t get_block)
{
- struct inode *inode = page->mapping->host;
+ struct address_space *mapping = page->mapping;
+ struct inode *inode = mapping->host;
const unsigned blkbits = inode->i_blkbits;
- const unsigned blocks_per_page = PAGE_CACHE_SIZE >> blkbits;
+ const unsigned blocks_per_page = page_cache_size(mapping) >> blkbits;
const unsigned blocksize = 1 << blkbits;
sector_t block_in_file;
sector_t last_block;
@@ -196,7 +198,7 @@ do_mpage_readpage(struct bio *bio, struc
if (page_has_buffers(page))
goto confused;

- block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
+ block_in_file = (sector_t)page->index << (page_cache_shift(mapping) - blkbits);
last_block = block_in_file + nr_pages * blocks_per_page;
last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits;
if (last_block > last_block_in_file)
@@ -284,7 +286,8 @@ do_mpage_readpage(struct bio *bio, struc
}

if (first_hole != blocks_per_page) {
- zero_user_segment(page, first_hole << blkbits, PAGE_CACHE_SIZE);
+ zero_user_segment(page, first_hole << blkbits,
+ page_cache_size(mapping));
if (first_hole == 0) {
SetPageUptodate(page);
unlock_page(page);
@@ -462,7 +465,7 @@ static int __mpage_writepage(struct page
struct inode *inode = page->mapping->host;
const unsigned blkbits = inode->i_blkbits;
unsigned long end_index;
- const unsigned blocks_per_page = PAGE_CACHE_SIZE >> blkbits;
+ const unsigned blocks_per_page = page_cache_size(mapping) >> blkbits;
sector_t last_block;
sector_t block_in_file;
sector_t blocks[MAX_BUF_PER_PAGE];
@@ -531,7 +534,8 @@ static int __mpage_writepage(struct page
* The page has no buffers: map it to disk
*/
BUG_ON(!PageUptodate(page));
- block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
+ block_in_file = (sector_t)page->index <<
+ (page_cache_shift(mapping) - blkbits);
last_block = (i_size - 1) >> blkbits;
map_bh.b_page = page;
for (page_block = 0; page_block < blocks_per_page; ) {
@@ -563,7 +567,7 @@ static int __mpage_writepage(struct page
first_unmapped = page_block;

page_is_mapped:
- end_index = i_size >> PAGE_CACHE_SHIFT;
+ end_index = page_cache_index(mapping, i_size);
if (page->index >= end_index) {
/*
* The page straddles i_size. It must be zeroed out on each
@@ -573,11 +577,11 @@ page_is_mapped:
* is zeroed when mapped, and writes to that region are not
* written out to the file."
*/
- unsigned offset = i_size & (PAGE_CACHE_SIZE - 1);
+ unsigned offset = page_cache_offset(mapping, i_size);

if (page->index > end_index || !offset)
goto confused;
- zero_user_segment(page, offset, PAGE_CACHE_SIZE);
+ zero_user_segment(page, offset, page_cache_size(mapping));
}

/*

--