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-rw-r--r--fs/buffer.c44
-rw-r--r--fs/cifs/inode.c2
-rw-r--r--fs/direct-io.c4
-rw-r--r--fs/ecryptfs/mmap.c5
-rw-r--r--fs/ext3/inode.c4
-rw-r--r--fs/ext4/inode.c4
-rw-r--r--fs/gfs2/bmap.c2
-rw-r--r--fs/gfs2/ops_address.c2
-rw-r--r--fs/libfs.c11
-rw-r--r--fs/mpage.c7
-rw-r--r--fs/nfs/read.c10
-rw-r--r--fs/nfs/write.c4
-rw-r--r--fs/ntfs/aops.c20
-rw-r--r--fs/ntfs/compress.c2
-rw-r--r--fs/ntfs/file.c32
-rw-r--r--fs/ocfs2/alloc.c2
-rw-r--r--fs/ocfs2/aops.c6
-rw-r--r--fs/reiserfs/inode.c4
-rw-r--r--fs/xfs/linux-2.6/xfs_lrw.c2
-rw-r--r--include/linux/highmem.h48
-rw-r--r--mm/filemap_xip.c2
-rw-r--r--mm/truncate.c2
22 files changed, 103 insertions, 116 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 456c9ab..1de9214 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1798,7 +1798,7 @@ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)
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);
}
@@ -1861,19 +1861,10 @@ static int __block_prepare_write(struct inode *inode, struct page *page,
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;
}
}
@@ -2104,8 +2095,7 @@ int block_read_full_page(struct page *page, get_block_t *get_block)
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;
@@ -2218,7 +2208,7 @@ int cont_expand_zero(struct file *file, struct address_space *mapping,
&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)
@@ -2245,7 +2235,7 @@ int cont_expand_zero(struct file *file, struct address_space *mapping,
&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)
@@ -2422,7 +2412,6 @@ int nobh_write_begin(struct file *file, struct address_space *mapping,
unsigned block_in_page;
unsigned block_start, block_end;
sector_t block_in_file;
- char *kaddr;
int nr_reads = 0;
int ret = 0;
int is_mapped_to_disk = 1;
@@ -2493,13 +2482,8 @@ int nobh_write_begin(struct file *file, struct address_space *mapping,
continue;
}
if (buffer_new(bh) || !buffer_mapped(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(bh))
@@ -2636,7 +2620,7 @@ int nobh_writepage(struct page *page, get_block_t *get_block,
* 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)
@@ -2709,7 +2693,7 @@ has_buffers:
if (page_has_buffers(page))
goto has_buffers;
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
set_page_dirty(page);
err = 0;
@@ -2785,7 +2769,7 @@ int block_truncate_page(struct address_space *mapping,
goto unlock;
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
mark_buffer_dirty(bh);
err = 0;
@@ -2831,7 +2815,7 @@ int block_write_full_page(struct page *page, get_block_t *get_block,
* 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);
}
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index d9567ba..47f2621 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1386,7 +1386,7 @@ static int cifs_truncate_page(struct address_space *mapping, loff_t from)
if (!page)
return -ENOMEM;
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
unlock_page(page);
page_cache_release(page);
return rc;
diff --git a/fs/direct-io.c b/fs/direct-io.c
index acf0da1..9e81add 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -878,8 +878,8 @@ 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;
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 32c5711..0535412 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -257,8 +257,7 @@ static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
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;
}
@@ -307,7 +306,7 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
*/
if ((i_size_read(page->mapping->host) == prev_page_end_size) &&
(from != 0)) {
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
}
out:
return rc;
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 9b162cd..0775354 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1845,7 +1845,7 @@ static int ext3_block_truncate_page(handle_t *handle, struct page *page,
*/
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;
}
@@ -1898,7 +1898,7 @@ static int ext3_block_truncate_page(handle_t *handle, struct page *page,
goto unlock;
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
BUFFER_TRACE(bh, "zeroed end of block");
err = 0;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bb717cb..05c4145 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1840,7 +1840,7 @@ int ext4_block_truncate_page(handle_t *handle, struct page *page,
*/
if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
ext4_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;
}
@@ -1893,7 +1893,7 @@ int ext4_block_truncate_page(handle_t *handle, struct page *page,
goto unlock;
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
BUFFER_TRACE(bh, "zeroed end of block");
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index e4effc4..e9456eb 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -932,7 +932,7 @@ static int gfs2_block_truncate_page(struct address_space *mapping)
if (!gfs2_is_writeback(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);
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 38dbe99..ac772b6 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -446,7 +446,7 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
* so we need to supply one here. It doesn't happen often.
*/
if (unlikely(page->index)) {
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
return 0;
}
diff --git a/fs/libfs.c b/fs/libfs.c
index 6e68b70..5523bde 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -341,13 +341,10 @@ int simple_prepare_write(struct file *file, struct page *page,
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;
}
diff --git a/fs/mpage.c b/fs/mpage.c
index d54f8f8..5df5643 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -276,9 +276,7 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
}
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);
@@ -571,8 +569,7 @@ 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);
}
/*
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 8fd6dfb..3d7d963 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -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_uninitialised_page(struct nfs_read_data *data)
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_open_context *ctx, struct inode *inode,
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)
@@ -532,7 +532,7 @@ readpage_async_filler(void *data, struct page *page)
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:
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 522efff..b144b19 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -665,9 +665,7 @@ zero_page:
* then we need to zero any uninitalised data. */
if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE
&& !PageUptodate(req->wb_page))
- zero_user_page(req->wb_page, req->wb_bytes,
- PAGE_CACHE_SIZE - req->wb_bytes,
- KM_USER0);
+ zero_user_segment(req->wb_page, req->wb_bytes, PAGE_CACHE_SIZE);
return req;
}
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index ad87cb0..00e9ccd 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -87,13 +87,17 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
/* 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);
@@ -410,7 +414,7 @@ retry_readpage:
/* Is the page fully outside i_size? (truncate in progress) */
if (unlikely(page->index >= (i_size + PAGE_CACHE_SIZE - 1) >>
PAGE_CACHE_SHIFT)) {
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
ntfs_debug("Read outside i_size - truncated?");
goto done;
}
@@ -459,7 +463,7 @@ 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))
@@ -788,8 +792,7 @@ 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;
@@ -1414,8 +1417,7 @@ 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))
diff --git a/fs/ntfs/compress.c b/fs/ntfs/compress.c
index d1619d0..33ff314 100644
--- a/fs/ntfs/compress.c
+++ b/fs/ntfs/compress.c
@@ -565,7 +565,7 @@ int ntfs_read_compressed_block(struct page *page)
if (xpage >= max_page) {
kfree(bhs);
kfree(pages);
- zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_CACHE_SIZE);
ntfs_debug("Compressed read outside i_size - truncated?");
SetPageUptodate(page);
unlock_page(page);
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 6cd08df..3c5550c 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -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;
}
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 64713e1..447206eb 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -5670,7 +5670,7 @@ static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
mlog_errno(ret);
if (zero)
- zero_user_page(page, from, to - from, KM_USER0);
+ zero_user_segment(page, from, to);
/*
* Need to set the buffers we zero'd into uptodate
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index bc7b4cb..8224312 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -307,7 +307,7 @@ static int ocfs2_readpage(struct file *file, struct page *page)
* 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;
@@ -869,7 +869,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
if (block_start >= to)
break;
- zero_user_page(page, block_start, bh->b_size, KM_USER0);
+ zero_user(page, block_start, bh->b_size);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
@@ -1034,7 +1034,7 @@ static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to
start = max(from, block_start);
end = min(to, block_end);
- zero_user_page(page, start, end - start, KM_USER0);
+ zero_user_segment(page, start, end);
set_buffer_uptodate(bh);
}
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 231fd5c..1953098 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2143,7 +2143,7 @@ int reiserfs_truncate_file(struct inode *p_s_inode, int update_timestamps)
/* 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);
}
@@ -2367,7 +2367,7 @@ static int reiserfs_write_full_page(struct page *page,
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);
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index d6a8ddd..6f614f3 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -155,7 +155,7 @@ 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);
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 1fcb003..61a5e5e 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -124,28 +124,40 @@ static inline void clear_highpage(struct page *page)
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
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index f874ae8..0420a02 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -431,7 +431,7 @@ xip_truncate_page(struct address_space *mapping, loff_t from)
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);
diff --git a/mm/truncate.c b/mm/truncate.c
index c3123b0..3855492 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -48,7 +48,7 @@ void do_invalidatepage(struct page *page, unsigned long offset)
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);
}
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