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authorGoldwyn Rodrigues <rgoldwyn@suse.de>2015-07-01 12:19:56 +1000
committerNeilBrown <neilb@suse.com>2015-07-24 13:37:55 +1000
commit33e38ac6887d975fe2635c7fcaefb6d5495cb2e1 (patch)
tree453697d25fb88f8d55d720cddf3a3df0a1c696f5 /drivers/md/bitmap.c
parentb0c26a79d6993b280931f8e2b406ca4b220bb58f (diff)
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: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'drivers/md/bitmap.c')
-rw-r--r--drivers/md/bitmap.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index a4ab51350f40..1b9c2df718c6 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -559,6 +559,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
unsigned long sectors_reserved = 0;
int err = -EINVAL;
struct page *sb_page;
+ loff_t offset = bitmap->mddev->bitmap_info.offset;
if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
chunksize = 128 * 1024 * 1024;
@@ -585,9 +586,9 @@ re_read:
bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
/* to 4k blocks */
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__,
- bitmap->cluster_slot, (unsigned long long)bitmap->mddev->bitmap_info.offset);
+ bitmap->cluster_slot, offset);
}
if (bitmap->storage.file) {
@@ -598,7 +599,7 @@ re_read:
bitmap, bytes, sb_page);
} else {
err = read_sb_page(bitmap->mddev,
- bitmap->mddev->bitmap_info.offset,
+ offset,
sb_page,
0, sizeof(bitmap_super_t));
}
@@ -1875,10 +1876,6 @@ int bitmap_copy_from_slot(struct mddev *mddev, int slot,
if (IS_ERR(bitmap))
return PTR_ERR(bitmap);
- rv = bitmap_read_sb(bitmap);
- if (rv)
- goto err;
-
rv = bitmap_init_from_disk(bitmap, 0);
if (rv)
goto err;