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Subject[patch 05/14] Use page_cache_xxx in mm/truncate.c
Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
mm/truncate.c | 35 ++++++++++++++++++-----------------
1 file changed, 18 insertions(+), 17 deletions(-)
Index: vps/mm/truncate.c
===================================================================
--- vps.orig/mm/truncate.c 2007-06-09 20:35:19.000000000 -0700
+++ vps/mm/truncate.c 2007-06-09 21:39:47.000000000 -0700
@@ -45,9 +45,10 @@ void do_invalidatepage(struct page *page
(*invalidatepage)(page, offset);
}

-static inline void truncate_partial_page(struct page *page, unsigned partial)
+static inline void truncate_partial_page(struct address_space *mapping,
+ struct page *page, unsigned partial)
{
- zero_user_segment(page, partial, PAGE_CACHE_SIZE);
+ zero_user_segment(page, partial, page_cache_size(mapping));
if (PagePrivate(page))
do_invalidatepage(page, partial);
}
@@ -95,7 +96,7 @@ truncate_complete_page(struct address_sp
if (page->mapping != mapping)
return;

- cancel_dirty_page(page, PAGE_CACHE_SIZE);
+ cancel_dirty_page(page, page_cache_size(mapping));

if (PagePrivate(page))
do_invalidatepage(page, 0);
@@ -157,9 +158,9 @@ invalidate_complete_page(struct address_
void truncate_inode_pages_range(struct address_space *mapping,
loff_t lstart, loff_t lend)
{
- const pgoff_t start = (lstart + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
+ const pgoff_t start = page_cache_next(mapping, lstart);
pgoff_t end;
- const unsigned partial = lstart & (PAGE_CACHE_SIZE - 1);
+ const unsigned partial = page_cache_offset(mapping, lstart);
struct pagevec pvec;
pgoff_t next;
int i;
@@ -167,8 +168,9 @@ void truncate_inode_pages_range(struct a
if (mapping->nrpages == 0)
return;

- BUG_ON((lend & (PAGE_CACHE_SIZE - 1)) != (PAGE_CACHE_SIZE - 1));
- end = (lend >> PAGE_CACHE_SHIFT);
+ BUG_ON(page_cache_offset(mapping, lend) !=
+ page_cache_size(mapping) - 1);
+ end = page_cache_index(mapping, lend);

pagevec_init(&pvec, 0);
next = start;
@@ -194,8 +196,8 @@ void truncate_inode_pages_range(struct a
}
if (page_mapped(page)) {
unmap_mapping_range(mapping,
- (loff_t)page_index<<PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE, 0);
+ page_cache_pos(mapping, page_index, 0),
+ page_cache_size(mapping), 0);
}
truncate_complete_page(mapping, page);
unlock_page(page);
@@ -208,7 +210,7 @@ void truncate_inode_pages_range(struct a
struct page *page = find_lock_page(mapping, start - 1);
if (page) {
wait_on_page_writeback(page);
- truncate_partial_page(page, partial);
+ truncate_partial_page(mapping, page, partial);
unlock_page(page);
page_cache_release(page);
}
@@ -236,8 +238,8 @@ void truncate_inode_pages_range(struct a
wait_on_page_writeback(page);
if (page_mapped(page)) {
unmap_mapping_range(mapping,
- (loff_t)page->index<<PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE, 0);
+ page_cache_pos(mapping, page->index, 0),
+ page_cache_size(mapping), 0);
}
if (page->index > next)
next = page->index;
@@ -421,9 +423,8 @@ int invalidate_inode_pages2_range(struct
* Zap the rest of the file in one hit.
*/
unmap_mapping_range(mapping,
- (loff_t)page_index<<PAGE_CACHE_SHIFT,
- (loff_t)(end - page_index + 1)
- << PAGE_CACHE_SHIFT,
+ page_cache_pos(mapping, page_index, 0),
+ page_cache_pos(mapping, end - page_index + 1, 0),
0);
did_range_unmap = 1;
} else {
@@ -431,8 +432,8 @@ int invalidate_inode_pages2_range(struct
* Just zap this page
*/
unmap_mapping_range(mapping,
- (loff_t)page_index<<PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE, 0);
+ page_cache_pos(mapping, page_index, 0),
+ page_cache_size(mapping), 0);
}
}
BUG_ON(page_mapped(page));
--
-
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