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Commit 33e38ac6 authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues Committed by NeilBrown
Browse files

md-cluster: fix bitmap sub-offset in bitmap_read_sb 



bitmap_read_sb is modifying mddev->bitmap_info.offset. This works for
the first bitmap read. However, when multiple bitmaps need to be opened
by the same node, it ends up corrupting the offset. Fix it by using a
local variable.

Also, bitmap_read_sb is not required in bitmap_copy_from_slot since
it is called in bitmap_create. Remove bitmap_read_sb().

Signed-off-by: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: default avatarNeilBrown <neilb@suse.com>
parent b0c26a79

drivers/md/bitmap.c

+4 −7
Original line number Original line Diff line number Diff line
@@ -559,6 +559,7 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
	unsigned long sectors_reserved = 0;

	unsigned long sectors_reserved = 0;

	int err = -EINVAL;

	int err = -EINVAL;

	struct page *sb_page;

	struct page *sb_page;

	loff_t offset = bitmap->mddev->bitmap_info.offset;





	if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {

	if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {

		chunksize = 128 * 1024 * 1024;

		chunksize = 128 * 1024 * 1024;
@@ -585,9 +586,9 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
		bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);

		bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);

		/* to 4k blocks */

		/* to 4k blocks */

		bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);

		bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);

		bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * (bm_blocks << 3);

		offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3));

		pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,

		pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,

			bitmap->cluster_slot, (unsigned long long)bitmap->mddev->bitmap_info.offset);

			bitmap->cluster_slot, offset);

	}

	}





	if (bitmap->storage.file) {

	if (bitmap->storage.file) {
@@ -598,7 +599,7 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
				bitmap, bytes, sb_page);

				bitmap, bytes, sb_page);

	} else {

	} else {

		err = read_sb_page(bitmap->mddev,

		err = read_sb_page(bitmap->mddev,

				   bitmap->mddev->bitmap_info.offset,

				   offset,

				   sb_page,

				   sb_page,

				   0, sizeof(bitmap_super_t));

				   0, sizeof(bitmap_super_t));

	}

	}
@@ -1875,10 +1876,6 @@ int bitmap_copy_from_slot(struct mddev *mddev, int slot, 
	if (IS_ERR(bitmap))

	if (IS_ERR(bitmap))

		return PTR_ERR(bitmap);

		return PTR_ERR(bitmap);





	rv = bitmap_read_sb(bitmap);

	if (rv)

		goto err;



	rv = bitmap_init_from_disk(bitmap, 0);

	rv = bitmap_init_from_disk(bitmap, 0);

	if (rv)

	if (rv)

		goto err;

		goto err;