6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yu Kuai <yukuai3@xxxxxxxxxx> [ Upstream commit ec6bb299c7c3dd4ca1724d13d5f5fae3ee54fc65 ] To avoid dereferencing bitmap directly in md-cluster to prepare inventing a new bitmap. BTW, also fix following checkpatch warnings: WARNING: Deprecated use of 'kmap_atomic', prefer 'kmap_local_page' instead WARNING: Deprecated use of 'kunmap_atomic', prefer 'kunmap_local' instead Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx> Link: https://lore.kernel.org/r/20240826074452.1490072-7-yukuai1@xxxxxxxxxxxxxxx Signed-off-by: Song Liu <song@xxxxxxxxxx> Stable-dep-of: 8d28d0ddb986 ("md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/md/md-bitmap.c | 6 ++++++ drivers/md/md-bitmap.h | 1 + drivers/md/md-cluster.c | 34 ++++++++++++++++++++-------------- 3 files changed, 27 insertions(+), 14 deletions(-) diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index f7b02d87a6da7..80b0cd7b88995 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -2115,10 +2115,15 @@ EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot); int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats) { struct bitmap_counts *counts; + bitmap_super_t *sb; if (!bitmap) return -ENOENT; + sb = kmap_local_page(bitmap->storage.sb_page); + stats->sync_size = le64_to_cpu(sb->sync_size); + kunmap_local(sb); + counts = &bitmap->counts; stats->missing_pages = counts->missing_pages; stats->pages = counts->pages; @@ -2126,6 +2131,7 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats) return 0; } +EXPORT_SYMBOL_GPL(md_bitmap_get_stats); int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks, int chunksize, int init) diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h index 60b86ee939081..840efd1b8a01c 100644 --- a/drivers/md/md-bitmap.h +++ b/drivers/md/md-bitmap.h @@ -236,6 +236,7 @@ struct bitmap { struct md_bitmap_stats { unsigned long missing_pages; + unsigned long sync_size; unsigned long pages; struct file *file; }; diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c index ca4d3a8d5dd76..6a89f6b5d64f9 100644 --- a/drivers/md/md-cluster.c +++ b/drivers/md/md-cluster.c @@ -1190,18 +1190,21 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz */ static int cluster_check_sync_size(struct mddev *mddev) { - int i, rv; - bitmap_super_t *sb; - unsigned long my_sync_size, sync_size = 0; - int node_num = mddev->bitmap_info.nodes; int current_slot = md_cluster_ops->slot_number(mddev); + int node_num = mddev->bitmap_info.nodes; struct bitmap *bitmap = mddev->bitmap; - char str[64]; struct dlm_lock_resource *bm_lockres; + struct md_bitmap_stats stats; + unsigned long sync_size = 0; + unsigned long my_sync_size; + char str[64]; + int i, rv; - sb = kmap_atomic(bitmap->storage.sb_page); - my_sync_size = le64_to_cpu(sb->sync_size); - kunmap_atomic(sb); + rv = md_bitmap_get_stats(bitmap, &stats); + if (rv) + return rv; + + my_sync_size = stats.sync_size; for (i = 0; i < node_num; i++) { if (i == current_slot) @@ -1230,15 +1233,18 @@ static int cluster_check_sync_size(struct mddev *mddev) md_bitmap_update_sb(bitmap); lockres_free(bm_lockres); - sb = kmap_atomic(bitmap->storage.sb_page); - if (sync_size == 0) - sync_size = le64_to_cpu(sb->sync_size); - else if (sync_size != le64_to_cpu(sb->sync_size)) { - kunmap_atomic(sb); + rv = md_bitmap_get_stats(bitmap, &stats); + if (rv) { + md_bitmap_free(bitmap); + return rv; + } + + if (sync_size == 0) { + sync_size = stats.sync_size; + } else if (sync_size != stats.sync_size) { md_bitmap_free(bitmap); return -1; } - kunmap_atomic(sb); md_bitmap_free(bitmap); } -- 2.39.5
