summaryrefslogtreecommitdiffstats
path: root/fs/ocfs2
diff options
context:
space:
mode:
authorChristoph Lameter <clameter@sgi.com>2008-02-04 22:28:29 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:13 -0800
commiteebd2aa355692afaf9906f62118620f1a1c19dbb (patch)
tree207eead3a736963c3e50942038c463f2f611ccce /fs/ocfs2
parentb98348bdd08dc4ec11828aa98a78edde15c53cfa (diff)
downloadop-kernel-dev-eebd2aa355692afaf9906f62118620f1a1c19dbb.zip
op-kernel-dev-eebd2aa355692afaf9906f62118620f1a1c19dbb.tar.gz
Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user
Simplify page cache zeroing of segments of pages through 3 functions zero_user_segments(page, start1, end1, start2, end2) Zeros two segments of the page. It takes the position where to start and end the zeroing which avoids length calculations and makes code clearer. zero_user_segment(page, start, end) Same for a single segment. zero_user(page, start, length) Length variant for the case where we know the length. We remove the zero_user_page macro. Issues: 1. Its a macro. Inline functions are preferable. 2. The KM_USER0 macro is only defined for HIGHMEM. Having to treat this special case everywhere makes the code needlessly complex. The parameter for zeroing is always KM_USER0 except in one single case that we open code. Avoiding KM_USER0 makes a lot of code not having to be dealing with the special casing for HIGHMEM anymore. Dealing with kmap is only necessary for HIGHMEM configurations. In those configurations we use KM_USER0 like we do for a series of other functions defined in highmem.h. Since KM_USER0 is depends on HIGHMEM the existing zero_user_page function could not be a macro. zero_user_* functions introduced here can be be inline because that constant is not used when these functions are called. Also extract the flushing of the caches to be outside of the kmap. [akpm@linux-foundation.org: fix nfs and ntfs build] [akpm@linux-foundation.org: fix ntfs build some more] Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Steven French <sfrench@us.ibm.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Cc: <linux-ext4@vger.kernel.org> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Anton Altaparmakov <aia21@cantab.net> Cc: Mark Fasheh <mark.fasheh@oracle.com> Cc: David Chinner <dgc@sgi.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Steven French <sfrench@us.ibm.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/alloc.c2
-rw-r--r--fs/ocfs2/aops.c6
2 files changed, 4 insertions, 4 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 64713e1..447206eb 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -5670,7 +5670,7 @@ static void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
mlog_errno(ret);
if (zero)
- zero_user_page(page, from, to - from, KM_USER0);
+ zero_user_segment(page, from, to);
/*
* Need to set the buffers we zero'd into uptodate
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index bc7b4cb..8224312 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -307,7 +307,7 @@ static int ocfs2_readpage(struct file *file, struct page *page)
* XXX sys_readahead() seems to get that wrong?
*/
if (start >= i_size_read(inode)) {
- zero_user_page(page, 0, PAGE_SIZE, KM_USER0);
+ zero_user(page, 0, PAGE_SIZE);
SetPageUptodate(page);
ret = 0;
goto out_alloc;
@@ -869,7 +869,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
if (block_start >= to)
break;
- zero_user_page(page, block_start, bh->b_size, KM_USER0);
+ zero_user(page, block_start, bh->b_size);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
@@ -1034,7 +1034,7 @@ static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to
start = max(from, block_start);
end = min(to, block_end);
- zero_user_page(page, start, end - start, KM_USER0);
+ zero_user_segment(page, start, end);
set_buffer_uptodate(bh);
}
OpenPOWER on IntegriCloud