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authorDavid Chinner <dgc@sgi.com>2007-02-10 10:37:46 +0300
committerTim Shimmin <tes@sgi.com>2007-02-10 10:37:46 +0300
commite7ff6aed8761b2c86cd9ab7083e512de2b8cfa48 (patch)
tree7a3e7e8ba879bbd72f55cbada44ebe542b179087 /fs/xfs
parent6be145bfb1ce93b2dbb854fee66fbb8d04916339 (diff)
downloadlinux-e7ff6aed8761b2c86cd9ab7083e512de2b8cfa48.tar.xz
[XFS] Don't use kmap in xfs_iozero.
kmap() is inefficient and does not scale well. kmap_atomic() is a better choice. Use the generic wrapper function instead of open coding the kmap-memset-dcache flush-kunmap stuff. SGI-PV: 960904 SGI-Modid: xfs-linux-melb:xfs-kern:28041a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/linux-2.6/xfs_lrw.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 0b5c9b6774c8..ff8d64eba9f8 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -137,7 +137,6 @@ xfs_iozero(
unsigned bytes;
struct page *page;
struct address_space *mapping;
- char *kaddr;
int status;
mapping = ip->i_mapping;
@@ -155,15 +154,13 @@ xfs_iozero(
if (!page)
break;
- kaddr = kmap(page);
status = mapping->a_ops->prepare_write(NULL, page, offset,
offset + bytes);
- if (status) {
+ if (status)
goto unlock;
- }
- memset((void *) (kaddr + offset), 0, bytes);
- flush_dcache_page(page);
+ memclear_highpage_flush(page, offset, bytes);
+
status = mapping->a_ops->commit_write(NULL, page, offset,
offset + bytes);
if (!status) {
@@ -172,7 +169,6 @@ xfs_iozero(
}
unlock:
- kunmap(page);
unlock_page(page);
page_cache_release(page);
if (status)