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Subject[PATCH 5/13] ext4: use zero_user_page
Use zero_user_page() instead of open-coding it. 

Signed-off-by: Nate Diller <nate.diller@gmail.com>

---

diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/ext4/inode.c linux-2.6.21-rc6-mm1-test/fs/ext4/inode.c
--- linux-2.6.21-rc6-mm1/fs/ext4/inode.c 2007-04-10 17:15:04.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/ext4/inode.c 2007-04-10 18:33:04.000000000 -0700
@@ -1791,7 +1791,6 @@ int ext4_block_truncate_page(handle_t *h
struct inode *inode = mapping->host;
struct buffer_head *bh;
int err = 0;
- void *kaddr;

if ((EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) &&
test_opt(inode->i_sb, EXTENTS) &&
@@ -1808,10 +1807,7 @@ int ext4_block_truncate_page(handle_t *h
*/
if (!page_has_buffers(page) && test_opt(inode->i_sb, NOBH) &&
ext4_should_writeback_data(inode) && PageUptodate(page)) {
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, length);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_page(page, offset, length);
set_page_dirty(page);
goto unlock;
}
@@ -1864,11 +1860,7 @@ int ext4_block_truncate_page(handle_t *h
goto unlock;
}

- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, length);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
-
+ zero_user_page(page, offset, length);
BUFFER_TRACE(bh, "zeroed end of block");

err = 0;
diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/ext4/writeback.c linux-2.6.21-rc6-mm1-test/fs/ext4/writeback.c
--- linux-2.6.21-rc6-mm1/fs/ext4/writeback.c 2007-04-10 18:05:52.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/ext4/writeback.c 2007-04-10 18:33:04.000000000 -0700
@@ -961,7 +961,6 @@ int ext4_wb_writepage(struct page *page,
loff_t i_size = i_size_read(inode);
pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
unsigned offset;
- void *kaddr;

wb_debug("writepage %lu from inode %lu\n", page->index, inode->i_ino);

@@ -1011,10 +1010,7 @@ int ext4_wb_writepage(struct page *page,
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_page(page, offset, PAGE_CACHE_SIZE - offset);
return ext4_wb_write_single_page(page, wbc);
}

@@ -1065,7 +1061,6 @@ int ext4_wb_block_truncate_page(handle_t
struct inode *inode = mapping->host;
struct buffer_head bh, *bhw = &bh;
unsigned blocksize, length;
- void *kaddr;
int err = 0;

wb_debug("partial truncate from %lu on page %lu from inode %lu\n",
@@ -1104,10 +1099,7 @@ int ext4_wb_block_truncate_page(handle_t
}
}

- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, length);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_page(page, offset, length);
SetPageUptodate(page);
__set_page_dirty_nobuffers(page);

-
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