[03/36] Use page_cache_xxx functions in mm/filemap.c

[clameter@sgi.com]

[-- Attachment #1: 0003-Use-page_cache_xxx-functions-in-mm-filemap.c.patch --]
[-- Type: text/plain, Size: 6637 bytes --]

Conver the uses of PAGE_CACHE_xxx to use page_cache_xxx instead.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
 mm/filemap.c |   56 ++++++++++++++++++++++++++++----------------------------
 1 files changed, 28 insertions(+), 28 deletions(-)

Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c	2007-08-27 19:22:13.000000000 -0700
+++ linux-2.6/mm/filemap.c	2007-08-27 19:31:13.000000000 -0700
@@ -303,8 +303,8 @@ int wait_on_page_writeback_range(struct 
 int sync_page_range(struct inode *inode, struct address_space *mapping,
 			loff_t pos, loff_t count)
 {
-	pgoff_t start = pos >> PAGE_CACHE_SHIFT;
-	pgoff_t end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
+	pgoff_t start = page_cache_index(mapping, pos);
+	pgoff_t end = page_cache_index(mapping, pos + count - 1);
 	int ret;
 
 	if (!mapping_cap_writeback_dirty(mapping) || !count)
@@ -335,8 +335,8 @@ EXPORT_SYMBOL(sync_page_range);
 int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
 			   loff_t pos, loff_t count)
 {
-	pgoff_t start = pos >> PAGE_CACHE_SHIFT;
-	pgoff_t end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
+	pgoff_t start = page_cache_index(mapping, pos);
+	pgoff_t end = page_cache_index(mapping, pos + count - 1);
 	int ret;
 
 	if (!mapping_cap_writeback_dirty(mapping) || !count)
@@ -365,7 +365,7 @@ int filemap_fdatawait(struct address_spa
 		return 0;
 
 	return wait_on_page_writeback_range(mapping, 0,
-				(i_size - 1) >> PAGE_CACHE_SHIFT);
+				page_cache_index(mapping, i_size - 1));
 }
 EXPORT_SYMBOL(filemap_fdatawait);
 
@@ -413,8 +413,8 @@ int filemap_write_and_wait_range(struct 
 		/* See comment of filemap_write_and_wait() */
 		if (err != -EIO) {
 			int err2 = wait_on_page_writeback_range(mapping,
-						lstart >> PAGE_CACHE_SHIFT,
-						lend >> PAGE_CACHE_SHIFT);
+					page_cache_index(mapping, lstart),
+					page_cache_index(mapping, lend));
 			if (!err)
 				err = err2;
 		}
@@ -877,12 +877,12 @@ void do_generic_mapping_read(struct addr
 	struct file_ra_state ra = *_ra;
 
 	cached_page = NULL;
-	index = *ppos >> PAGE_CACHE_SHIFT;
+	index = page_cache_index(mapping, *ppos);
 	next_index = index;
 	prev_index = ra.prev_index;
 	prev_offset = ra.prev_offset;
-	last_index = (*ppos + desc->count + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
-	offset = *ppos & ~PAGE_CACHE_MASK;
+	last_index = page_cache_next(mapping, *ppos + desc->count);
+	offset = page_cache_offset(mapping, *ppos);
 
 	for (;;) {
 		struct page *page;
@@ -919,16 +919,16 @@ page_ok:
 		 */
 
 		isize = i_size_read(inode);
-		end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
+		end_index = page_cache_index(mapping, isize - 1);
 		if (unlikely(!isize || index > end_index)) {
 			page_cache_release(page);
 			goto out;
 		}
 
 		/* nr is the maximum number of bytes to copy from this page */
-		nr = PAGE_CACHE_SIZE;
+		nr = page_cache_size(mapping);
 		if (index == end_index) {
-			nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
+			nr = page_cache_offset(mapping, isize - 1) + 1;
 			if (nr <= offset) {
 				page_cache_release(page);
 				goto out;
@@ -963,8 +963,8 @@ page_ok:
 		 */
 		ret = actor(desc, page, offset, nr);
 		offset += ret;
-		index += offset >> PAGE_CACHE_SHIFT;
-		offset &= ~PAGE_CACHE_MASK;
+		index += page_cache_index(mapping, offset);
+		offset = page_cache_offset(mapping, offset);
 		prev_offset = offset;
 		ra.prev_offset = offset;
 
@@ -1058,7 +1058,7 @@ out:
 	*_ra = ra;
 	_ra->prev_index = prev_index;
 
-	*ppos = ((loff_t) index << PAGE_CACHE_SHIFT) + offset;
+	*ppos = page_cache_pos(mapping, index, offset);
 	if (cached_page)
 		page_cache_release(cached_page);
 	if (filp)
@@ -1240,8 +1240,8 @@ asmlinkage ssize_t sys_readahead(int fd,
 	if (file) {
 		if (file->f_mode & FMODE_READ) {
 			struct address_space *mapping = file->f_mapping;
-			unsigned long start = offset >> PAGE_CACHE_SHIFT;
-			unsigned long end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
+			unsigned long start = page_cache_index(mapping, offset);
+			unsigned long end = page_cache_index(mapping, offset + count - 1);
 			unsigned long len = end - start + 1;
 			ret = do_readahead(mapping, file, start, len);
 		}
@@ -1310,7 +1310,7 @@ int filemap_fault(struct vm_area_struct 
 	int did_readaround = 0;
 	int ret = 0;
 
-	size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+	size = page_cache_next(mapping, i_size_read(inode));
 	if (vmf->pgoff >= size)
 		goto outside_data_content;
 
@@ -1385,7 +1385,7 @@ retry_find:
 		goto page_not_uptodate;
 
 	/* Must recheck i_size under page lock */
-	size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+	size = page_cache_next(mapping, i_size_read(inode));
 	if (unlikely(vmf->pgoff >= size)) {
 		unlock_page(page);
 		goto outside_data_content;
@@ -1869,9 +1869,9 @@ generic_file_buffered_write(struct kiocb
 		unsigned long offset;
 		size_t copied;
 
-		offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
-		index = pos >> PAGE_CACHE_SHIFT;
-		bytes = PAGE_CACHE_SIZE - offset;
+		offset = page_cache_offset(mapping, pos); /* Within page */
+		index = page_cache_index(mapping, pos);
+		bytes = page_cache_size(mapping) - offset;
 
 		/* Limit the size of the copy to the caller's write size */
 		bytes = min(bytes, count);
@@ -2082,8 +2082,8 @@ __generic_file_aio_write_nolock(struct k
 		if (err == 0) {
 			written = written_buffered;
 			invalidate_mapping_pages(mapping,
-						 pos >> PAGE_CACHE_SHIFT,
-						 endbyte >> PAGE_CACHE_SHIFT);
+						 page_cache_index(mapping, pos),
+						 page_cache_index(mapping, endbyte));
 		} else {
 			/*
 			 * We don't know how much we wrote, so just return
@@ -2170,7 +2170,7 @@ generic_file_direct_IO(int rw, struct ki
 	 */
 	if (rw == WRITE) {
 		write_len = iov_length(iov, nr_segs);
-		end = (offset + write_len - 1) >> PAGE_CACHE_SHIFT;
+		end = page_cache_index(mapping, offset + write_len - 1);
 	       	if (mapping_mapped(mapping))
 			unmap_mapping_range(mapping, offset, write_len, 0);
 	}
@@ -2187,7 +2187,7 @@ generic_file_direct_IO(int rw, struct ki
 	 */
 	if (rw == WRITE && mapping->nrpages) {
 		retval = invalidate_inode_pages2_range(mapping,
-					offset >> PAGE_CACHE_SHIFT, end);
+					page_cache_index(mapping, offset), end);
 		if (retval)
 			goto out;
 	}
@@ -2205,7 +2205,7 @@ generic_file_direct_IO(int rw, struct ki
 	 */
 	if (rw == WRITE && mapping->nrpages) {
 		int err = invalidate_inode_pages2_range(mapping,
-					      offset >> PAGE_CACHE_SHIFT, end);
+					      page_cache_index(mapping, offset), end);
 		if (err && retval >= 0)
 			retval = err;
 	}

--