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| author | Nate Diller <nate.diller@gmail.com> | 2007-05-09 02:35:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:55 -0700 |
| commit | 01f2705daf5a36208e69d7cf95db9c330f843af6 (patch) | |
| tree | 2d2c7a042c2466ed985f6e0950450c099f02725f /fs/direct-io.c | |
| parent | 38a23e311b6cd389b9d8af2ea6c28c8cffbe581c (diff) | |
| download | linux-stable-01f2705daf5a36208e69d7cf95db9c330f843af6.tar.gz linux-stable-01f2705daf5a36208e69d7cf95db9c330f843af6.tar.bz2 linux-stable-01f2705daf5a36208e69d7cf95db9c330f843af6.zip | |
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 'fs/direct-io.c')
| -rw-r--r-- | fs/direct-io.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index d9d0833444f5..8aa2d8b04ef1 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -867,7 +867,6 @@ static int do_direct_IO(struct dio *dio) do_holes: /* Handle holes */ if (!buffer_mapped(map_bh)) { - char *kaddr; loff_t i_size_aligned; /* AKPM: eargh, -ENOTBLK is a hack */ @@ -888,11 +887,8 @@ do_holes: page_cache_release(page); goto out; } - kaddr = kmap_atomic(page, KM_USER0); - memset(kaddr + (block_in_page << blkbits), - 0, 1 << blkbits); - flush_dcache_page(page); - kunmap_atomic(kaddr, KM_USER0); + zero_user_page(page, block_in_page << blkbits, + 1 << blkbits, KM_USER0); dio->block_in_file++; block_in_page++; goto next_block; |