From b150f5c1c759d551da9146435d3dc9df5f7e15ef Mon Sep 17 00:00:00 2001
From: Milosz Tanski <milosz@adfin.com>
Date: Fri, 9 Aug 2013 12:59:55 -0400
Subject: [PATCH] ceph: cleanup the logic in ceph_invalidatepage
The invalidatepage code bails if it encounters a non-zero page offset. The
current logic that does is non-obvious with multiple if statements.
This should be logically and functionally equivalent.
Signed-off-by: Milosz Tanski <milosz@adfin.com>
Reviewed-by: Sage Weil <sage@inktank.com>
---
fs/ceph/addr.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 722585cd5c7e..cb78ce81d6a6 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -151,6 +151,13 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
struct ceph_snap_context *snapc = page_snap_context(page);
inode = page->mapping->host;
+ ci = ceph_inode(inode);
+
+ if (offset != 0 || length != PAGE_CACHE_SIZE) {
+ dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
+ inode, page, page->index, offset, length);
+ return;
+ }
/*
* We can get non-dirty pages here due to races between
@@ -160,21 +167,15 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
if (!PageDirty(page))
pr_err("%p invalidatepage %p page not dirty\n", inode, page);
- if (offset == 0 && length == PAGE_CACHE_SIZE)
- ClearPageChecked(page);
+ ClearPageChecked(page);
- ci = ceph_inode(inode);
- if (offset == 0 && length == PAGE_CACHE_SIZE) {
- dout("%p invalidatepage %p idx %lu full dirty page\n",
- inode, page, page->index);
- ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
- ceph_put_snap_context(snapc);
- page->private = 0;
- ClearPagePrivate(page);
- } else {
- dout("%p invalidatepage %p idx %lu partial dirty page %u(%u)\n",
- inode, page, page->index, offset, length);
- }
+ dout("%p invalidatepage %p idx %lu full dirty page\n",
+ inode, page, page->index);
+
+ ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
+ ceph_put_snap_context(snapc);
+ page->private = 0;
+ ClearPagePrivate(page);
}
/* just a sanity check */
--
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