[PATCH 4.13 046/109] md/bitmap: copy correct data for bitmap super

Greg Kroah-Hartman
2017-09-24T20:57:21Z

From: Shaohua Li <shli@fb.com>

commit 8031c3ddc70ab93099e7d1814382dba39f57b43e upstream.

raid5 cache could write bitmap superblock before bitmap superblock is
initialized. The bitmap superblock is less than 512B. The current code will
only copy the superblock to a new page and write the whole 512B, which will
zero the the data after the superblock. Unfortunately the data could include
bitmap, which we should preserve. The patch will make superblock read do 4k
chunk and we always copy the 4k data to new page, so the superblock write will
old data to disk and we don't change the bitmap.

Reported-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/bitmap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -625,7 +625,7 @@ re_read:
err = read_sb_page(bitmap->mddev,
offset,
sb_page,
- 0, sizeof(bitmap_super_t));
+ 0, PAGE_SIZE);
}
if (err)
return err;
@@ -2118,7 +2118,7 @@ int bitmap_resize(struct bitmap *bitmap,
if (store.sb_page && bitmap->storage.sb_page)
memcpy(page_address(store.sb_page),
page_address(bitmap->storage.sb_page),
- sizeof(bitmap_super_t));
+ PAGE_SIZE);
bitmap_file_unmap(&bitmap->storage);
bitmap->storage = store;