[patch 16/18] Use page_cache_xxx in fs/ext4

[Christoph Lameter <clameter@sgi.com>]

[-- Attachment #1: 0017-Use-page_cache_xxx-in-fs-ext4.patch --]
[-- Type: text/plain, Size: 5108 bytes --]

Use page_cache_xxx in fs/ext4

Reviewed-by: Dave Chinner <dgc@sgi.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
 fs/ext4/dir.c   |    3 ++-
 fs/ext4/inode.c |   34 +++++++++++++++++-----------------
 2 files changed, 19 insertions(+), 18 deletions(-)

Index: linux-2.6/fs/ext4/dir.c
===================================================================
--- linux-2.6.orig/fs/ext4/dir.c	2008-02-14 15:19:11.993504338 -0800
+++ linux-2.6/fs/ext4/dir.c	2008-02-15 16:15:16.385202022 -0800
@@ -132,7 +132,8 @@ static int ext4_readdir(struct file * fi
 		err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh, 0, 0);
 		if (err > 0) {
 			pgoff_t index = map_bh.b_blocknr >>
-					(PAGE_CACHE_SHIFT - inode->i_blkbits);
+				(page_cache_size(inode->i_mapping)
+					- inode->i_blkbits);
 			if (!ra_has_index(&filp->f_ra, index))
 				page_cache_sync_readahead(
 					sb->s_bdev->bd_inode->i_mapping,
Index: linux-2.6/fs/ext4/inode.c
===================================================================
--- linux-2.6.orig/fs/ext4/inode.c	2008-02-14 15:19:12.005504520 -0800
+++ linux-2.6/fs/ext4/inode.c	2008-02-15 16:15:16.389202066 -0800
@@ -1142,8 +1142,8 @@ static int ext4_write_begin(struct file 
  	pgoff_t index;
  	unsigned from, to;
 
- 	index = pos >> PAGE_CACHE_SHIFT;
- 	from = pos & (PAGE_CACHE_SIZE - 1);
+ 	index = page_cache_index(mapping, pos);
+ 	from = page_cache_offset(mapping, pos);
  	to = from + len;
 
 retry:
@@ -1238,7 +1238,7 @@ static int ext4_ordered_write_end(struct
 	unsigned from, to;
 	int ret = 0, ret2;
 
-	from = pos & (PAGE_CACHE_SIZE - 1);
+	from = page_cache_offset(mapping, pos);
 	to = from + len;
 
 	ret = walk_page_buffers(handle, page_buffers(page),
@@ -1308,7 +1308,7 @@ static int ext4_journalled_write_end(str
 	int partial = 0;
 	unsigned from, to;
 
-	from = pos & (PAGE_CACHE_SIZE - 1);
+	from = page_cache_offset(mapping, pos);
 	to = from + len;
 
 	if (copied < len) {
@@ -1471,6 +1471,7 @@ static int ext4_ordered_writepage(struct
 	handle_t *handle = NULL;
 	int ret = 0;
 	int err;
+	int pagesize = page_cache_size(inode->i_mapping);
 
 	J_ASSERT(PageLocked(page));
 
@@ -1493,8 +1494,7 @@ static int ext4_ordered_writepage(struct
 				(1 << BH_Dirty)|(1 << BH_Uptodate));
 	}
 	page_bufs = page_buffers(page);
-	walk_page_buffers(handle, page_bufs, 0,
-			PAGE_CACHE_SIZE, NULL, bget_one);
+	walk_page_buffers(handle, page_bufs, 0, pagesize, NULL, bget_one);
 
 	ret = block_write_full_page(page, ext4_get_block, wbc);
 
@@ -1511,13 +1511,12 @@ static int ext4_ordered_writepage(struct
 	 * and generally junk.
 	 */
 	if (ret == 0) {
-		err = walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE,
+		err = walk_page_buffers(handle, page_bufs, 0, pagesize,
 					NULL, jbd2_journal_dirty_data_fn);
 		if (!ret)
 			ret = err;
 	}
-	walk_page_buffers(handle, page_bufs, 0,
-			PAGE_CACHE_SIZE, NULL, bput_one);
+	walk_page_buffers(handle, page_bufs, 0, pagesize, NULL, bput_one);
 	err = ext4_journal_stop(handle);
 	if (!ret)
 		ret = err;
@@ -1569,6 +1568,7 @@ static int ext4_journalled_writepage(str
 	handle_t *handle = NULL;
 	int ret = 0;
 	int err;
+	int pagesize = page_cache_size(inode->i_mapping);
 
 	if (ext4_journal_current_handle())
 		goto no_write;
@@ -1585,17 +1585,16 @@ static int ext4_journalled_writepage(str
 		 * doesn't seem much point in redirtying the page here.
 		 */
 		ClearPageChecked(page);
-		ret = block_prepare_write(page, 0, PAGE_CACHE_SIZE,
-					ext4_get_block);
+		ret = block_prepare_write(page, 0, pagesize, ext4_get_block);
 		if (ret != 0) {
 			ext4_journal_stop(handle);
 			goto out_unlock;
 		}
 		ret = walk_page_buffers(handle, page_buffers(page), 0,
-			PAGE_CACHE_SIZE, NULL, do_journal_get_write_access);
+			pagesize, NULL, do_journal_get_write_access);
 
 		err = walk_page_buffers(handle, page_buffers(page), 0,
-				PAGE_CACHE_SIZE, NULL, write_end_fn);
+			pagesize, NULL, write_end_fn);
 		if (ret == 0)
 			ret = err;
 		EXT4_I(inode)->i_state |= EXT4_STATE_JDATA;
@@ -1818,8 +1817,8 @@ void ext4_set_aops(struct inode *inode)
 int ext4_block_truncate_page(handle_t *handle, struct page *page,
 		struct address_space *mapping, loff_t from)
 {
-	ext4_fsblk_t index = from >> PAGE_CACHE_SHIFT;
-	unsigned offset = from & (PAGE_CACHE_SIZE-1);
+	ext4_fsblk_t index = page_cache_index(mapping, from);
+	unsigned offset = page_cache_offset(mapping, from);
 	unsigned blocksize, length, pos;
 	ext4_lblk_t iblock;
 	struct inode *inode = mapping->host;
@@ -1828,7 +1827,8 @@ int ext4_block_truncate_page(handle_t *h
 
 	blocksize = inode->i_sb->s_blocksize;
 	length = blocksize - (offset & (blocksize - 1));
-	iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
+	iblock = index <<
+		(page_cache_shift(mapping) - inode->i_sb->s_blocksize_bits);
 
 	/*
 	 * For "nobh" option,  we can only work if we don't need to
@@ -2308,7 +2308,7 @@ void ext4_truncate(struct inode *inode)
 		page = NULL;
 	} else {
 		page = grab_cache_page(mapping,
-				inode->i_size >> PAGE_CACHE_SHIFT);
+				page_cache_index(mapping, inode->i_size));
 		if (!page)
 			return;
 	}

--