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Subject[patch 03/14] Use page_cache_xx function in mm/filemap.c
Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
mm/filemap.c | 76 +++++++++++++++++++++++++++++------------------------------
1 file changed, 38 insertions(+), 38 deletions(-)
Index: vps/mm/filemap.c
===================================================================
--- vps.orig/mm/filemap.c 2007-06-08 10:57:37.000000000 -0700
+++ vps/mm/filemap.c 2007-06-09 21:15:04.000000000 -0700
@@ -304,8 +304,8 @@ EXPORT_SYMBOL(add_to_page_cache_lru);
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)
@@ -336,8 +336,8 @@ 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)
@@ -366,7 +366,7 @@ 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);

@@ -414,8 +414,8 @@ 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;
}
@@ -881,28 +881,28 @@ void do_generic_mapping_read(struct addr
int error;
struct file_ra_state ra = *_ra;

- 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);

isize = i_size_read(inode);
if (!isize)
goto out;

- end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
+ end_index = page_cache_index(mapping, isize - 1);
for (;;) {
struct page *page;
unsigned long nr, ret;

/* 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) {
if (index > end_index)
goto out;
- nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
+ nr = page_cache_offset(mapping, isize - 1) + 1;
if (nr <= offset) {
goto out;
}
@@ -956,8 +956,8 @@ 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;

@@ -1023,16 +1023,16 @@ readpage:
* another truncate extends the file - this is desired though).
*/
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;
@@ -1073,7 +1073,7 @@ out:
*_ra = ra;
_ra->prev_index = prev_index;

- *ppos = ((loff_t) index << PAGE_CACHE_SHIFT) + offset;
+ *ppos = page_cache_pos(mapping, index, offset);
if (filp)
file_accessed(filp);
}
@@ -1291,8 +1291,8 @@ 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);
}
@@ -1364,7 +1364,7 @@ struct page *filemap_fault(struct vm_are

BUG_ON(!(vma->vm_flags & VM_CAN_INVALIDATE));

- size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ size = page_cache_next(mapping, i_size_read(inode));
if (fdata->pgoff >= size)
goto outside_data_content;

@@ -1439,7 +1439,7 @@ 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(fdata->pgoff >= size)) {
unlock_page(page);
goto outside_data_content;
@@ -1930,8 +1930,8 @@ int pagecache_write_begin(struct file *f
pagep, fsdata);
} else {
int ret;
- pgoff_t index = pos >> PAGE_CACHE_SHIFT;
- unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
+ pgoff_t index = page_cache_index(mapping, pos);
+ unsigned offset = page_cache_offset(mapping, pos);
struct inode *inode = mapping->host;
struct page *page;
again:
@@ -1984,7 +1984,7 @@ int pagecache_write_end(struct file *fil
ret = aops->write_end(file, mapping, pos, len, copied,
page, fsdata);
} else {
- unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned offset = page_cache_offset(mapping, pos);
struct inode *inode = mapping->host;

flush_dcache_page(page);
@@ -2089,9 +2089,9 @@ static ssize_t generic_perform_write_2co
unsigned long bytes; /* Bytes to write to page */
size_t copied; /* Bytes copied from user */

- offset = (pos & (PAGE_CACHE_SIZE - 1));
- index = pos >> PAGE_CACHE_SHIFT;
- bytes = min_t(unsigned long, PAGE_CACHE_SIZE - offset,
+ offset = page_cache_offset(mapping, pos );
+ index = page_cache_index(mapping, pos);
+ bytes = min_t(unsigned long, page_cache_size(mapping) - offset,
iov_iter_count(i));

/*
@@ -2267,9 +2267,9 @@ static ssize_t generic_perform_write(str
size_t copied; /* Bytes copied from user */
void *fsdata;

- offset = (pos & (PAGE_CACHE_SIZE - 1));
- index = pos >> PAGE_CACHE_SHIFT;
- bytes = min_t(unsigned long, PAGE_CACHE_SIZE - offset,
+ offset = page_cache_offset(mapping, pos);
+ index = page_cache_index(mapping, pos);
+ bytes = min_t(unsigned long, page_cache_size(mapping) - offset,
iov_iter_count(i));

again:
@@ -2316,7 +2316,7 @@ again:
* because not all segments in the iov can be copied at
* once without a pagefault.
*/
- bytes = min_t(unsigned long, PAGE_CACHE_SIZE - offset,
+ bytes = min_t(unsigned long, page_cache_size(mapping) - offset,
iov_iter_single_seg_count(i));
goto again;
}
@@ -2459,8 +2459,8 @@ __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
@@ -2547,7 +2547,7 @@ 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);
}
@@ -2564,7 +2564,7 @@ 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;
}
@@ -2582,7 +2582,7 @@ 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;
}
--
-
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