[patch 02/14] Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user

From: clameter
Date: Thu Jun 14 2007 - 15:41:42 EST

Simplify page cache zeroing of segments of pages through 3 functions

zero_user_segments(page, start1, end1, start2, end2)

Zeros two segments of the page. It takes the position where to
start and end the zeroing which avoids length calculations.

zero_user_segment(page, start, end)

Same for a single segment.

zero_user(page, start, length)

Length variant for the case where we know the length.



We remove the zero_user_page macro. Issues:

1. Its a macro. Inline functions are preferable.

2. The KM_USER0 macro is only defined for HIGHMEM.

Having to treat this special case everywhere makes the
code needlessly complex. The parameter for zeroing is always
KM_USER0 except in one single case that we open code.

Avoiding KM_USER0 makes a lot of code not having to be dealing
with the special casing for HIGHMEM anymore. Dealing with
kmap is only necessary for HIGHMEM configurations. In those
configurations we use KM_USER0 like we do for a series of other
functions defined in highmem.h.

Since KM_USER0 is depends on HIGHMEM the existing zero_user_page
function could not be a macro. zero_user_* functions introduced
here can be because that constant is not used when these
functions are called.

Extract the flushing of the caches to be outside of the kmap.

Signed-off-by: Christoph Lameter <clameter@xxxxxxx>

---
fs/affs/file.c | 2 -
fs/buffer.c | 47 +++++++++--------------------
fs/direct-io.c | 4 +-
fs/ecryptfs/mmap.c | 5 +--
fs/ext3/inode.c | 4 +-
fs/gfs2/bmap.c | 2 -
fs/libfs.c | 19 +++---------
fs/mpage.c | 7 +---
fs/nfs/read.c | 10 +++---
fs/nfs/write.c | 2 -
fs/ntfs/aops.c | 18 ++++++-----
fs/ntfs/file.c | 32 +++++++++-----------
fs/ocfs2/aops.c | 2 -
fs/reiser4/plugin/file/cryptcompress.c | 8 +----
fs/reiser4/plugin/file/file.c | 2 -
fs/reiser4/plugin/item/ctail.c | 2 -
fs/reiser4/plugin/item/extent_file_ops.c | 4 +-
fs/reiser4/plugin/item/tail.c | 3 -
fs/reiserfs/inode.c | 4 +-
fs/xfs/linux-2.6/xfs_lrw.c | 2 -
include/linux/highmem.h | 49 +++++++++++++++++++------------
mm/filemap_xip.c | 2 -
mm/truncate.c | 2 -
23 files changed, 107 insertions(+), 125 deletions(-)

Index: vps/include/linux/highmem.h
===================================================================
--- vps.orig/include/linux/highmem.h 2007-06-11 22:33:01.000000000 -0700
+++ vps/include/linux/highmem.h 2007-06-11 22:33:07.000000000 -0700
@@ -124,28 +124,41 @@ static inline void clear_highpage(struct
kunmap_atomic(kaddr, KM_USER0);
}

-/*
- * Same but also flushes aliased cache contents to RAM.
- *
- * This must be a macro because KM_USER0 and friends aren't defined if
- * !CONFIG_HIGHMEM
- */
-#define zero_user_page(page, offset, size, km_type) \
- do { \
- void *kaddr; \
- \
- BUG_ON((offset) + (size) > PAGE_SIZE); \
- \
- kaddr = kmap_atomic(page, km_type); \
- memset((char *)kaddr + (offset), 0, (size)); \
- flush_dcache_page(page); \
- kunmap_atomic(kaddr, (km_type)); \
- } while (0)
+static inline void zero_user_segments(struct page *page,
+ unsigned start1, unsigned end1,
+ unsigned start2, unsigned end2)
+{
+ void *kaddr = kmap_atomic(page, KM_USER0);
+
+ BUG_ON(end1 > PAGE_SIZE ||
+ end2 > PAGE_SIZE);
+
+ if (end1 > start1)
+ memset(kaddr + start1, 0, end1 - start1);
+
+ if (end2 > start2)
+ memset(kaddr + start2, 0, end2 - start2);
+
+ kunmap_atomic(kaddr, KM_USER0);
+ flush_dcache_page(page);
+}
+
+static inline void zero_user_segment(struct page *page,
+ unsigned start, unsigned end)
+{
+ zero_user_segments(page, start, end, 0, 0);
+}
+
+static inline void zero_user(struct page *page,
+ unsigned start, unsigned size)
+{
+ zero_user_segments(page, start, start + size, 0, 0);
+}

static inline void __deprecated memclear_highpage_flush(struct page *page,
unsigned int offset, unsigned int size)
{
- zero_user_page(page, offset, size, KM_USER0);
+ zero_user(page, offset, size);
}

#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
Index: vps/fs/buffer.c
===================================================================
--- vps.orig/fs/buffer.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/buffer.c 2007-06-11 22:49:08.000000000 -0700
@@ -1792,7 +1792,7 @@ void page_zero_new_buffers(struct page *
start = max(from, block_start);
size = min(to, block_end) - start;

- zero_user_page(page, start, size, KM_USER0);
+ zero_user(page, start, size);
set_buffer_uptodate(bh);
}

@@ -1855,19 +1855,10 @@ static int __block_prepare_write(struct
mark_buffer_dirty(bh);
continue;
}
- if (block_end > to || block_start < from) {
- void *kaddr;
-
- kaddr = kmap_atomic(page, KM_USER0);
- if (block_end > to)
- memset(kaddr+to, 0,
- block_end-to);
- if (block_start < from)
- memset(kaddr+block_start,
- 0, from-block_start);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- }
+ if (block_end > to || block_start < from)
+ zero_user_segments(page,
+ to, block_end,
+ block_start, from);
continue;
}
}
@@ -2095,8 +2086,7 @@ int block_read_full_page(struct page *pa
SetPageError(page);
}
if (!buffer_mapped(bh)) {
- zero_user_page(page, i * blocksize, blocksize,
- KM_USER0);
+ zero_user(page, i * blocksize, blocksize);
if (!err)
set_buffer_uptodate(bh);
continue;
@@ -2209,7 +2199,7 @@ int cont_expand_zero(struct file *file,
&page, &fsdata);
if (err)
goto out;
- zero_user_page(page, zerofrom, len, KM_USER0);
+ zero_user(page, zerofrom, len);
err = pagecache_write_end(file, mapping, curpos, len, len,
page, fsdata);
if (err < 0)
@@ -2236,7 +2226,7 @@ int cont_expand_zero(struct file *file,
&page, &fsdata);
if (err)
goto out;
- zero_user_page(page, zerofrom, len, KM_USER0);
+ zero_user(page, zerofrom, len);
err = pagecache_write_end(file, mapping, curpos, len, len,
page, fsdata);
if (err < 0)
@@ -2350,7 +2340,6 @@ int nobh_prepare_write(struct page *page
unsigned block_in_page;
unsigned block_start;
sector_t block_in_file;
- char *kaddr;
int nr_reads = 0;
int i;
int ret = 0;
@@ -2390,13 +2379,8 @@ int nobh_prepare_write(struct page *page
if (PageUptodate(page))
continue;
if (buffer_new(&map_bh) || !buffer_mapped(&map_bh)) {
- kaddr = kmap_atomic(page, KM_USER0);
- if (block_start < from)
- memset(kaddr+block_start, 0, from-block_start);
- if (block_end > to)
- memset(kaddr + to, 0, block_end - to);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_segments(page, block_start, from,
+ to, block_end);
continue;
}
if (buffer_uptodate(&map_bh))
@@ -2462,7 +2446,7 @@ failed:
* Error recovery is pretty slack. Clear the page and mark it dirty
* so we'll later zero out any blocks which _were_ allocated.
*/
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
set_page_dirty(page);
return ret;
@@ -2531,7 +2515,7 @@ int nobh_writepage(struct page *page, ge
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
out:
ret = mpage_writepage(page, get_block, wbc);
if (ret == -EAGAIN)
@@ -2565,8 +2549,7 @@ int nobh_truncate_page(struct address_sp
to = (offset + blocksize) & ~(blocksize - 1);
ret = a_ops->prepare_write(NULL, page, offset, to);
if (ret == 0) {
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset,
- KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
/*
* It would be more correct to call aops->commit_write()
* here, but this is more efficient.
@@ -2645,7 +2628,7 @@ int block_truncate_page(struct address_s
goto unlock;
}

- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
mark_buffer_dirty(bh);
err = 0;

@@ -2691,7 +2674,7 @@ int block_write_full_page(struct page *p
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
return __block_write_full_page(inode, page, get_block, wbc);
}

Index: vps/fs/libfs.c
===================================================================
--- vps.orig/fs/libfs.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/libfs.c 2007-06-11 22:49:09.000000000 -0700
@@ -340,13 +340,10 @@ int simple_prepare_write(struct file *fi
unsigned from, unsigned to)
{
if (!PageUptodate(page)) {
- if (to - from != PAGE_CACHE_SIZE) {
- void *kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr, 0, from);
- memset(kaddr + to, 0, PAGE_CACHE_SIZE - to);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- }
+ if (to - from != PAGE_CACHE_SIZE)
+ zero_user_segments(page,
+ 0, from,
+ to, PAGE_CACHE_SIZE);
}
return 0;
}
@@ -396,12 +393,8 @@ int simple_write_end(struct file *file,
unsigned from = pos & (PAGE_CACHE_SIZE - 1);

/* zero the stale part of the page if we did a short copy */
- if (copied < len) {
- void *kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + from + copied, 0, len - copied);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- }
+ if (copied < len)
+ zero_user(page, from + copied, len);

simple_commit_write(file, page, from, from+copied);

Index: vps/fs/affs/file.c
===================================================================
--- vps.orig/fs/affs/file.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/affs/file.c 2007-06-11 22:33:07.000000000 -0700
@@ -628,7 +628,7 @@ static int affs_prepare_write_ofs(struct
return err;
}
if (to < PAGE_CACHE_SIZE) {
- zero_user_page(page, to, PAGE_CACHE_SIZE - to, KM_USER0);
+ zero_user_segment(page, to, PAGE_CACHE_SIZE);
if (size > offset + to) {
if (size < offset + PAGE_CACHE_SIZE)
tmp = size & ~PAGE_CACHE_MASK;
Index: vps/fs/mpage.c
===================================================================
--- vps.orig/fs/mpage.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/mpage.c 2007-06-11 22:49:08.000000000 -0700
@@ -284,9 +284,7 @@ do_mpage_readpage(struct bio *bio, struc
}

if (first_hole != blocks_per_page) {
- zero_user_page(page, first_hole << blkbits,
- PAGE_CACHE_SIZE - (first_hole << blkbits),
- KM_USER0);
+ zero_user_segment(page, first_hole << blkbits, PAGE_CACHE_SIZE);
if (first_hole == 0) {
SetPageUptodate(page);
unlock_page(page);
@@ -579,8 +577,7 @@ page_is_mapped:

if (page->index > end_index || !offset)
goto confused;
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset,
- KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
}

/*
Index: vps/fs/ntfs/aops.c
===================================================================
--- vps.orig/fs/ntfs/aops.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/ntfs/aops.c 2007-06-11 22:33:07.000000000 -0700
@@ -87,13 +87,17 @@ static void ntfs_end_buffer_async_read(s
/* Check for the current buffer head overflowing. */
if (unlikely(file_ofs + bh->b_size > init_size)) {
int ofs;
+ void *kaddr;

ofs = 0;
if (file_ofs < init_size)
ofs = init_size - file_ofs;
local_irq_save(flags);
- zero_user_page(page, bh_offset(bh) + ofs,
- bh->b_size - ofs, KM_BIO_SRC_IRQ);
+ kaddr = kmap_atomic(page, KM_BIO_SRC_IRQ);
+ memset(kaddr + bh_offset(bh) + ofs, 0,
+ bh->b_size - ofs);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_BIO_SRC_IRQ);
local_irq_restore(flags);
}
} else {
@@ -334,7 +338,7 @@ handle_hole:
bh->b_blocknr = -1UL;
clear_buffer_mapped(bh);
handle_zblock:
- zero_user_page(page, i * blocksize, blocksize, KM_USER0);
+ zero_user(page, i * blocksize, blocksize);
if (likely(!err))
set_buffer_uptodate(bh);
} while (i++, iblock++, (bh = bh->b_this_page) != head);
@@ -451,7 +455,7 @@ retry_readpage:
* ok to ignore the compressed flag here.
*/
if (unlikely(page->index > 0)) {
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
goto done;
}
if (!NInoAttr(ni))
@@ -780,8 +784,7 @@ lock_retry_remap:
if (err == -ENOENT || lcn == LCN_ENOENT) {
bh->b_blocknr = -1;
clear_buffer_dirty(bh);
- zero_user_page(page, bh_offset(bh), blocksize,
- KM_USER0);
+ zero_user(page, bh_offset(bh), blocksize);
set_buffer_uptodate(bh);
err = 0;
continue;
@@ -1406,8 +1409,7 @@ retry_writepage:
if (page->index >= (i_size >> PAGE_CACHE_SHIFT)) {
/* The page straddles i_size. */
unsigned int ofs = i_size & ~PAGE_CACHE_MASK;
- zero_user_page(page, ofs, PAGE_CACHE_SIZE - ofs,
- KM_USER0);
+ zero_user_segment(page, ofs, PAGE_CACHE_SIZE);
}
/* Handle mst protected attributes. */
if (NInoMstProtected(ni))
Index: vps/fs/reiserfs/inode.c
===================================================================
--- vps.orig/fs/reiserfs/inode.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/reiserfs/inode.c 2007-06-11 22:33:07.000000000 -0700
@@ -2151,7 +2151,7 @@ int reiserfs_truncate_file(struct inode
/* if we are not on a block boundary */
if (length) {
length = blocksize - length;
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
if (buffer_mapped(bh) && bh->b_blocknr != 0) {
mark_buffer_dirty(bh);
}
@@ -2375,7 +2375,7 @@ static int reiserfs_write_full_page(stru
unlock_page(page);
return 0;
}
- zero_user_page(page, last_offset, PAGE_CACHE_SIZE - last_offset, KM_USER0);
+ zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
}
bh = head;
block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
Index: vps/mm/truncate.c
===================================================================
--- vps.orig/mm/truncate.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/mm/truncate.c 2007-06-11 22:54:27.000000000 -0700
@@ -47,7 +47,7 @@ void do_invalidatepage(struct page *page

static inline void truncate_partial_page(struct page *page, unsigned partial)
{
- zero_user_page(page, partial, PAGE_CACHE_SIZE - partial, KM_USER0);
+ zero_user_segment(page, partial, PAGE_CACHE_SIZE);
if (PagePrivate(page))
do_invalidatepage(page, partial);
}
Index: vps/fs/direct-io.c
===================================================================
--- vps.orig/fs/direct-io.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/direct-io.c 2007-06-11 22:33:07.000000000 -0700
@@ -887,8 +887,8 @@ do_holes:
page_cache_release(page);
goto out;
}
- zero_user_page(page, block_in_page << blkbits,
- 1 << blkbits, KM_USER0);
+ zero_user(page, block_in_page << blkbits,
+ 1 << blkbits);
dio->block_in_file++;
block_in_page++;
goto next_block;
Index: vps/mm/filemap_xip.c
===================================================================
--- vps.orig/mm/filemap_xip.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/mm/filemap_xip.c 2007-06-11 22:54:27.000000000 -0700
@@ -461,7 +461,7 @@ xip_truncate_page(struct address_space *
else
return PTR_ERR(page);
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
return 0;
}
EXPORT_SYMBOL_GPL(xip_truncate_page);
Index: vps/fs/ext3/inode.c
===================================================================
--- vps.orig/fs/ext3/inode.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/ext3/inode.c 2007-06-11 22:33:07.000000000 -0700
@@ -1818,7 +1818,7 @@ static int ext3_block_truncate_page(hand
*/
if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
ext3_should_writeback_data(inode) && PageUptodate(page)) {
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
set_page_dirty(page);
goto unlock;
}
@@ -1871,7 +1871,7 @@ static int ext3_block_truncate_page(hand
goto unlock;
}

- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
BUFFER_TRACE(bh, "zeroed end of block");

err = 0;
Index: vps/fs/ntfs/file.c
===================================================================
--- vps.orig/fs/ntfs/file.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/ntfs/file.c 2007-06-11 22:33:07.000000000 -0700
@@ -607,8 +607,8 @@ do_next_page:
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
- zero_user_page(page, bh_offset(bh),
- blocksize, KM_USER0);
+ zero_user(page, bh_offset(bh),
+ blocksize);
set_buffer_uptodate(bh);
}
}
@@ -683,9 +683,8 @@ map_buffer_cached:
ntfs_submit_bh_for_read(bh);
*wait_bh++ = bh;
} else {
- zero_user_page(page,
- bh_offset(bh),
- blocksize, KM_USER0);
+ zero_user(page, bh_offset(bh),
+ blocksize);
set_buffer_uptodate(bh);
}
}
@@ -703,8 +702,8 @@ map_buffer_cached:
*/
if (bh_end <= pos || bh_pos >= end) {
if (!buffer_uptodate(bh)) {
- zero_user_page(page, bh_offset(bh),
- blocksize, KM_USER0);
+ zero_user(page, bh_offset(bh),
+ blocksize);
set_buffer_uptodate(bh);
}
mark_buffer_dirty(bh);
@@ -743,8 +742,7 @@ map_buffer_cached:
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
- zero_user_page(page, bh_offset(bh), blocksize,
- KM_USER0);
+ zero_user(page, bh_offset(bh), blocksize);
set_buffer_uptodate(bh);
}
continue;
@@ -868,8 +866,8 @@ rl_not_mapped_enoent:
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh)) {
- zero_user_page(page, bh_offset(bh),
- blocksize, KM_USER0);
+ zero_user(page, bh_offset(bh),
+ blocksize);
set_buffer_uptodate(bh);
}
continue;
@@ -1128,8 +1126,8 @@ rl_not_mapped_enoent:

if (likely(bh_pos < initialized_size))
ofs = initialized_size - bh_pos;
- zero_user_page(page, bh_offset(bh) + ofs,
- blocksize - ofs, KM_USER0);
+ zero_user_segment(page, bh_offset(bh) + ofs,
+ blocksize);
}
} else /* if (unlikely(!buffer_uptodate(bh))) */
err = -EIO;
@@ -1269,8 +1267,8 @@ rl_not_mapped_enoent:
if (PageUptodate(page))
set_buffer_uptodate(bh);
else {
- zero_user_page(page, bh_offset(bh),
- blocksize, KM_USER0);
+ zero_user(page, bh_offset(bh),
+ blocksize);
set_buffer_uptodate(bh);
}
}
@@ -1330,7 +1328,7 @@ err_out:
len = PAGE_CACHE_SIZE;
if (len > bytes)
len = bytes;
- zero_user_page(*pages, 0, len, KM_USER0);
+ zero_user(*pages, 0, len);
}
goto out;
}
@@ -1451,7 +1449,7 @@ err_out:
len = PAGE_CACHE_SIZE;
if (len > bytes)
len = bytes;
- zero_user_page(*pages, 0, len, KM_USER0);
+ zero_user(*pages, 0, len);
}
goto out;
}
Index: vps/fs/nfs/read.c
===================================================================
--- vps.orig/fs/nfs/read.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/nfs/read.c 2007-06-11 22:33:07.000000000 -0700
@@ -79,7 +79,7 @@ void nfs_readdata_release(void *data)
static
int nfs_return_empty_page(struct page *page)
{
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
unlock_page(page);
return 0;
@@ -103,10 +103,10 @@ static void nfs_readpage_truncate_uninit
pglen = PAGE_CACHE_SIZE - base;
for (;;) {
if (remainder <= pglen) {
- zero_user_page(*pages, base, remainder, KM_USER0);
+ zero_user(*pages, base, remainder);
break;
}
- zero_user_page(*pages, base, pglen, KM_USER0);
+ zero_user(*pages, base, pglen);
pages++;
remainder -= pglen;
pglen = PAGE_CACHE_SIZE;
@@ -130,7 +130,7 @@ static int nfs_readpage_async(struct nfs
return PTR_ERR(new);
}
if (len < PAGE_CACHE_SIZE)
- zero_user_page(page, len, PAGE_CACHE_SIZE - len, KM_USER0);
+ zero_user_segment(page, len, PAGE_CACHE_SIZE);

nfs_list_add_request(new, &one_request);
if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
@@ -538,7 +538,7 @@ readpage_async_filler(void *data, struct
goto out_error;

if (len < PAGE_CACHE_SIZE)
- zero_user_page(page, len, PAGE_CACHE_SIZE - len, KM_USER0);
+ zero_user_segment(page, len, PAGE_CACHE_SIZE);
nfs_pageio_add_request(desc->pgio, new);
return 0;
out_error:
Index: vps/fs/nfs/write.c
===================================================================
--- vps.orig/fs/nfs/write.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/nfs/write.c 2007-06-11 22:33:07.000000000 -0700
@@ -168,7 +168,7 @@ static void nfs_mark_uptodate(struct pag
if (count != nfs_page_length(page))
return;
if (count != PAGE_CACHE_SIZE)
- zero_user_page(page, count, PAGE_CACHE_SIZE - count, KM_USER0);
+ zero_user_segment(page, count, PAGE_CACHE_SIZE);
SetPageUptodate(page);
}

Index: vps/fs/xfs/linux-2.6/xfs_lrw.c
===================================================================
--- vps.orig/fs/xfs/linux-2.6/xfs_lrw.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/xfs/linux-2.6/xfs_lrw.c 2007-06-11 22:33:07.000000000 -0700
@@ -154,7 +154,7 @@ xfs_iozero(
if (status)
break;

- zero_user_page(page, offset, bytes, KM_USER0);
+ zero_user(page, offset, bytes);

status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
page, fsdata);
Index: vps/fs/ecryptfs/mmap.c
===================================================================
--- vps.orig/fs/ecryptfs/mmap.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/ecryptfs/mmap.c 2007-06-11 22:33:07.000000000 -0700
@@ -370,8 +370,7 @@ static int fill_zeros_to_end_of_page(str
end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE;
if (to > end_byte_in_page)
end_byte_in_page = to;
- zero_user_page(page, end_byte_in_page,
- PAGE_CACHE_SIZE - end_byte_in_page, KM_USER0);
+ zero_user_segment(page, end_byte_in_page, PAGE_CACHE_SIZE);
out:
return 0;
}
@@ -784,7 +783,7 @@ int write_zeros(struct file *file, pgoff
page_cache_release(tmp_page);
goto out;
}
- zero_user_page(tmp_page, start, num_zeros, KM_USER0);
+ zero_user(tmp_page, start, num_zeros);
rc = ecryptfs_commit_write(file, tmp_page, start, start + num_zeros);
if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting to write zero's "
Index: vps/fs/gfs2/bmap.c
===================================================================
--- vps.orig/fs/gfs2/bmap.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/gfs2/bmap.c 2007-06-11 22:33:07.000000000 -0700
@@ -932,7 +932,7 @@ static int gfs2_block_truncate_page(stru
if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
gfs2_trans_add_bh(ip->i_gl, bh, 0);

- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);

unlock:
unlock_page(page);
Index: vps/fs/ocfs2/aops.c
===================================================================
--- vps.orig/fs/ocfs2/aops.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/ocfs2/aops.c 2007-06-11 22:33:07.000000000 -0700
@@ -238,7 +238,7 @@ static int ocfs2_readpage(struct file *f
* XXX sys_readahead() seems to get that wrong?
*/
if (start >= i_size_read(inode)) {
- zero_user_page(page, 0, PAGE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_SIZE);
SetPageUptodate(page);
ret = 0;
goto out_alloc;
Index: vps/fs/reiser4/plugin/file/cryptcompress.c
===================================================================
--- vps.orig/fs/reiser4/plugin/file/cryptcompress.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/reiser4/plugin/file/cryptcompress.c 2007-06-11 22:33:07.000000000 -0700
@@ -1933,7 +1933,7 @@ static int write_hole(struct inode *inod

to_pg = min_count(PAGE_CACHE_SIZE - pg_off, cl_count);
lock_page(page);
- zero_user_page(page, pg_off, to_pg, KM_USER0);
+ zero_user(page, pg_off, to_pg);
SetPageUptodate(page);
unlock_page(page);

@@ -2169,8 +2169,7 @@ static int read_some_cluster_pages(struc
off = off_to_pgoff(win->off+win->count+win->delta);
if (off) {
lock_page(pg);
- zero_user_page(pg, off, PAGE_CACHE_SIZE - off,
- KM_USER0);
+ zero_user_segment(pg, off, PAGE_CACHE_SIZE);
unlock_page(pg);
}
}
@@ -2217,8 +2216,7 @@ static int read_some_cluster_pages(struc

offset =
off_to_pgoff(win->off + win->count + win->delta);
- zero_user_page(pg, offset, PAGE_CACHE_SIZE - offset,
- KM_USER0);
+ zero_user_segment(pg, offset, PAGE_CACHE_SIZE);
unlock_page(pg);
/* still not uptodate */
break;
Index: vps/fs/reiser4/plugin/file/file.c
===================================================================
--- vps.orig/fs/reiser4/plugin/file/file.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/reiser4/plugin/file/file.c 2007-06-11 22:33:07.000000000 -0700
@@ -538,7 +538,7 @@ static int shorten_file(struct inode *in

lock_page(page);
assert("vs-1066", PageLocked(page));
- zero_user_page(page, padd_from, PAGE_CACHE_SIZE - padd_from, KM_USER0);
+ zero_user_segment(page, padd_from, PAGE_CACHE_SIZE);
unlock_page(page);
page_cache_release(page);
/* the below does up(sbinfo->delete_mutex). Do not get confused */
Index: vps/fs/reiser4/plugin/item/ctail.c
===================================================================
--- vps.orig/fs/reiser4/plugin/item/ctail.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/reiser4/plugin/item/ctail.c 2007-06-11 22:33:07.000000000 -0700
@@ -627,7 +627,7 @@ int do_readpage_ctail(struct inode * ino
#endif
case FAKE_DISK_CLUSTER:
/* fill the page by zeroes */
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
break;
case PREP_DISK_CLUSTER:
Index: vps/fs/reiser4/plugin/item/extent_file_ops.c
===================================================================
--- vps.orig/fs/reiser4/plugin/item/extent_file_ops.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/reiser4/plugin/item/extent_file_ops.c 2007-06-11 22:33:07.000000000 -0700
@@ -1112,7 +1112,7 @@ int reiser4_do_readpage_extent(reiser4_e
*/
j = jfind(mapping, index);
if (j == NULL) {
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
unlock_page(page);
return 0;
@@ -1127,7 +1127,7 @@ int reiser4_do_readpage_extent(reiser4_e
block = *jnode_get_io_block(j);
spin_unlock_jnode(j);
if (block == 0) {
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
unlock_page(page);
jput(j);
Index: vps/fs/reiser4/plugin/item/tail.c
===================================================================
--- vps.orig/fs/reiser4/plugin/item/tail.c 2007-06-11 22:33:01.000000000 -0700
+++ vps/fs/reiser4/plugin/item/tail.c 2007-06-11 22:33:07.000000000 -0700
@@ -392,8 +392,7 @@ static int do_readpage_tail(uf_coord_t *

done:
if (mapped != PAGE_CACHE_SIZE)
- zero_user_page(page, mapped, PAGE_CACHE_SIZE - mapped,
- KM_USER0);
+ zero_user_segment(page, mapped, PAGE_CACHE_SIZE);
SetPageUptodate(page);
out_unlock_page:
unlock_page(page);

--
-
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