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[XFS] Don't use kmap in xfs_iozero.

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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>
This commit is contained in:
David Chinner 2007-02-10 18:37:46 +11:00 committed by Tim Shimmin
parent 6be145bfb1
commit e7ff6aed87
1 changed files with 3 additions and 7 deletions
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10
fs/xfs/linux-2.6/xfs_lrw.c
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@ -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)