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authorNate Diller <nate.diller@gmail.com>2007-05-09 02:35:07 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 12:30:55 -0700
commit01f2705daf5a36208e69d7cf95db9c330f843af6 (patch)
tree2d2c7a042c2466ed985f6e0950450c099f02725f /drivers/block/loop.c
parent38a23e311b6cd389b9d8af2ea6c28c8cffbe581c (diff)
downloadop-kernel-dev-01f2705daf5a36208e69d7cf95db9c330f843af6.zip
op-kernel-dev-01f2705daf5a36208e69d7cf95db9c330f843af6.tar.gz
fs: convert core functions to zero_user_page
It's very common for file systems to need to zero part or all of a page, the simplist way is just to use kmap_atomic() and memset(). There's actually a library function in include/linux/highmem.h that does exactly that, but it's confusingly named memclear_highpage_flush(), which is descriptive of *how* it does the work rather than what the *purpose* is. So this patchset renames the function to zero_user_page(), and calls it from the various places that currently open code it. This first patch introduces the new function call, and converts all the core kernel callsites, both the open-coded ones and the old memclear_highpage_flush() ones. Following this patch is a series of conversions for each file system individually, per AKPM, and finally a patch deprecating the old call. The diffstat below shows the entire patchset. [akpm@linux-foundation.org: fix a few things] Signed-off-by: Nate Diller <nate.diller@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/loop.c')
-rw-r--r--drivers/block/loop.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index af6d7274..18cdd8c 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -243,17 +243,13 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
transfer_result = lo_do_transfer(lo, WRITE, page, offset,
bvec->bv_page, bv_offs, size, IV);
if (unlikely(transfer_result)) {
- char *kaddr;
-
/*
* The transfer failed, but we still write the data to
* keep prepare/commit calls balanced.
*/
printk(KERN_ERR "loop: transfer error block %llu\n",
(unsigned long long)index);
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + offset, 0, size);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_page(page, offset, size, KM_USER0);
}
flush_dcache_page(page);
ret = aops->commit_write(file, page, offset,
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