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md-bitmap: small cleanups

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In md_bitmap_unplug, bitmap->storage.filemap is double checked.

In md_bitmap_daemon_work, bitmap->storage.filemap should be checked
before reference.

Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Zhiqiang Liu 2019-12-07 11:00:08 +08:00 committed by Song Liu
parent 8e42d239cb
commit 55180498df
1 changed files with 2 additions and 3 deletions
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5
drivers/md/md-bitmap.c
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@ -1019,8 +1019,6 @@ void md_bitmap_unplug(struct bitmap *bitmap)
/* look at each page to see if there are any set bits that need to be
* flushed out to disk */
for (i = 0; i < bitmap->storage.file_pages; i++) {
if (!bitmap->storage.filemap)
return;
dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
need_write = test_and_clear_page_attr(bitmap, i,
BITMAP_PAGE_NEEDWRITE);
@ -1338,7 +1336,8 @@ void md_bitmap_daemon_work(struct mddev *mddev)
BITMAP_PAGE_DIRTY))
/* bitmap_unplug will handle the rest */
break;
if (test_and_clear_page_attr(bitmap, j,
if (bitmap->storage.filemap &&
test_and_clear_page_attr(bitmap, j,
BITMAP_PAGE_NEEDWRITE)) {
write_page(bitmap, bitmap->storage.filemap[j], 0);
}