md/md-bitmap: fix incorrect usage for sb_index

Commit d7038f951828 ("md-bitmap: don't use ->index for pages backing the
bitmap file") removed page->index from bitmap code, but left wrong code
logic for clustered-md. current code never set slot offset for cluster
nodes, will sometimes cause crash in clustered env.

Call trace (partly):
 md_bitmap_file_set_bit+0x110/0x1d8 [md_mod]
 md_bitmap_startwrite+0x13c/0x240 [md_mod]
 raid1_make_request+0x6b0/0x1c08 [raid1]
 md_handle_request+0x1dc/0x368 [md_mod]
 md_submit_bio+0x80/0xf8 [md_mod]
 __submit_bio+0x178/0x300
 submit_bio_noacct_nocheck+0x11c/0x338
 submit_bio_noacct+0x134/0x614
 submit_bio+0x28/0xdc
 submit_bh_wbc+0x130/0x1cc
 submit_bh+0x1c/0x28

Fixes: d7038f951828 ("md-bitmap: don't use ->index for pages backing the bitmap file")
Cc: stable@vger.kernel.org # v6.6+
Signed-off-by: Heming Zhao <heming.zhao@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240223121128.28985-1-heming.zhao@suse.com

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 9672f75c30503cefc197ed0c3234d7a254b9fbe4..a4976ceae8688a6080af12a3fc1c12f01459c7c2 100644 (file)
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -234,7 +234,8 @@ static int __write_sb_page(struct md_rdev *rdev, struct bitmap *bitmap,
        sector_t doff;
 
        bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
-       if (pg_index == store->file_pages - 1) {
+       /* we compare length (page numbers), not page offset. */
+       if ((pg_index - store->sb_index) == store->file_pages - 1) {
                unsigned int last_page_size = store->bytes & (PAGE_SIZE - 1);
 
                if (last_page_size == 0)
@@ -438,8 +439,8 @@ static void filemap_write_page(struct bitmap *bitmap, unsigned long pg_index,
        struct page *page = store->filemap[pg_index];
 
        if (mddev_is_clustered(bitmap->mddev)) {
-               pg_index += bitmap->cluster_slot *
-                       DIV_ROUND_UP(store->bytes, PAGE_SIZE);
+               /* go to node bitmap area starting point */
+               pg_index += store->sb_index;
        }
 
        if (store->file)
@@ -952,6 +953,7 @@ static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
        unsigned long index = file_page_index(store, chunk);
        unsigned long node_offset = 0;
 
+       index += store->sb_index;
        if (mddev_is_clustered(bitmap->mddev))
                node_offset = bitmap->cluster_slot * store->file_pages;
 
@@ -982,6 +984,7 @@ static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
        unsigned long index = file_page_index(store, chunk);
        unsigned long node_offset = 0;
 
+       index += store->sb_index;
        if (mddev_is_clustered(bitmap->mddev))
                node_offset = bitmap->cluster_slot * store->file_pages;