diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 884de28a41e4..50404e8c3629 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1997,6 +1997,49 @@ static int read_one_block_group(struct btrfs_fs_info *info,
 	return ret;
 }
 
+static int fill_dummy_bgs(struct btrfs_fs_info *fs_info)
+{
+	struct extent_map_tree *em_tree = &fs_info->mapping_tree;
+	struct extent_map *em;
+	struct map_lookup *map;
+	struct btrfs_block_group *bg;
+	struct btrfs_space_info *space_info;
+	struct rb_node *node;
+	int ret = 0;
+
+	for (node = rb_first_cached(&em_tree->map); node;
+	     node = rb_next(node)) {
+		em = rb_entry(node, struct extent_map, rb_node);
+		map = em->map_lookup;
+		bg = btrfs_create_block_group_cache(fs_info, em->start);
+		if (!bg) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		/* Fill dummy cache as FULL */
+		bg->length = em->len;
+		bg->flags = map->type;
+		bg->last_byte_to_unpin = (u64)-1;
+		bg->cached = BTRFS_CACHE_FINISHED;
+		bg->used = em->len;
+		bg->flags = map->type;
+		ret = btrfs_add_block_group_cache(fs_info, bg);
+		if (ret) {
+			btrfs_remove_free_space_cache(bg);
+			btrfs_put_block_group(bg);
+			break;
+		}
+		btrfs_update_space_info(fs_info, bg->flags, em->len, em->len,
+					0, &space_info);
+		bg->space_info = space_info;
+		link_block_group(bg);
+
+		set_avail_alloc_bits(fs_info, bg->flags);
+	}
+	return ret;
+}
+
 int btrfs_read_block_groups(struct btrfs_fs_info *info)
 {
 	struct btrfs_path *path;
@@ -2007,6 +2050,9 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info)
 	int need_clear = 0;
 	u64 cache_gen;
 
+	if (btrfs_test_opt(info, RESCUE_ALL))
+		return fill_dummy_bgs(info);
+
 	key.objectid = 0;
 	key.offset = 0;
 	key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b70c2024296f..93848c2b6eb5 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1266,6 +1266,7 @@ static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
 #define BTRFS_MOUNT_NOLOGREPLAY		(1 << 27)
 #define BTRFS_MOUNT_REF_VERIFY		(1 << 28)
 #define BTRFS_MOUNT_DISCARD_ASYNC	(1 << 29)
+#define BTRFS_MOUNT_RESCUE_ALL		(1 << 30)
 
 #define BTRFS_DEFAULT_COMMIT_INTERVAL	(30)
 #define BTRFS_DEFAULT_MAX_INLINE	(2048)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c850d7f44fbe..805b9e836589 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2326,8 +2326,13 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
 
 	root = btrfs_read_tree_root(tree_root, &location);
 	if (IS_ERR(root)) {
-		ret = PTR_ERR(root);
-		goto out;
+		if (!btrfs_test_opt(fs_info, RESCUE_ALL)) {
+			ret = PTR_ERR(root);
+			goto out;
+		}
+	} else {
+		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+		fs_info->extent_root = root;
 	}
 	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
 	fs_info->extent_root = root;
@@ -2335,21 +2340,27 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
 	location.objectid = BTRFS_DEV_TREE_OBJECTID;
 	root = btrfs_read_tree_root(tree_root, &location);
 	if (IS_ERR(root)) {
-		ret = PTR_ERR(root);
-		goto out;
+		if (!btrfs_test_opt(fs_info, RESCUE_ALL)) {
+			ret = PTR_ERR(root);
+			goto out;
+		}
+	} else {
+		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+		fs_info->dev_root = root;
+		btrfs_init_devices_late(fs_info);
 	}
-	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
-	fs_info->dev_root = root;
-	btrfs_init_devices_late(fs_info);
 
 	location.objectid = BTRFS_CSUM_TREE_OBJECTID;
 	root = btrfs_read_tree_root(tree_root, &location);
 	if (IS_ERR(root)) {
-		ret = PTR_ERR(root);
-		goto out;
+		if (!btrfs_test_opt(fs_info, RESCUE_ALL)) {
+			ret = PTR_ERR(root);
+			goto out;
+		}
+	} else {
+		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+		fs_info->csum_root = root;
 	}
-	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
-	fs_info->csum_root = root;
 
 	/*
 	 * This tree can share blocks with some other fs tree during relocation
@@ -2358,11 +2369,14 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
 	root = btrfs_get_fs_root(tree_root->fs_info,
 				 BTRFS_DATA_RELOC_TREE_OBJECTID, true);
 	if (IS_ERR(root)) {
-		ret = PTR_ERR(root);
-		goto out;
+		if (!btrfs_test_opt(fs_info, RESCUE_ALL)) {
+			ret = PTR_ERR(root);
+			goto out;
+		}
+	} else {
+		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+		fs_info->data_reloc_root = root;
 	}
-	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
-	fs_info->data_reloc_root = root;
 
 	location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
 	root = btrfs_read_tree_root(tree_root, &location);
@@ -2375,9 +2389,11 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
 	location.objectid = BTRFS_UUID_TREE_OBJECTID;
 	root = btrfs_read_tree_root(tree_root, &location);
 	if (IS_ERR(root)) {
-		ret = PTR_ERR(root);
-		if (ret != -ENOENT)
-			goto out;
+		if (!btrfs_test_opt(fs_info, RESCUE_ALL)) {
+			ret = PTR_ERR(root);
+			if (ret != -ENOENT)
+				goto out;
+		}
 	} else {
 		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
 		fs_info->uuid_root = root;
@@ -2387,11 +2403,14 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
 		location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
 		root = btrfs_read_tree_root(tree_root, &location);
 		if (IS_ERR(root)) {
-			ret = PTR_ERR(root);
-			goto out;
+			if (!btrfs_test_opt(fs_info, RESCUE_ALL)) {
+				ret = PTR_ERR(root);
+				goto out;
+			}
+		}  else {
+			set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
+			fs_info->free_space_root = root;
 		}
-		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
-		fs_info->free_space_root = root;
 	}
 
 	return 0;
@@ -3106,6 +3125,14 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
 		goto fail_alloc;
 	}
 
+	/* Skip bg needs RO and no tree-log to replay */
+	if (btrfs_test_opt(fs_info, RESCUE_ALL) && !sb_rdonly(sb)) {
+		btrfs_err(fs_info,
+			  "rescue=all can only be used on read-only mount");
+		err = -EINVAL;
+		goto fail_alloc;
+	}
+
 	ret = btrfs_init_workqueues(fs_info, fs_devices);
 	if (ret) {
 		err = ret;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 611b3412fbfd..e3d73ee73f80 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2191,7 +2191,8 @@ static blk_status_t btrfs_submit_bio_hook(struct inode *inode, struct bio *bio,
 	int skip_sum;
 	int async = !atomic_read(&BTRFS_I(inode)->sync_writers);
 
-	skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;
+	skip_sum = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) ||
+		!fs_info->csum_root;
 
 	if (btrfs_is_free_space_inode(BTRFS_I(inode)))
 		metadata = BTRFS_WQ_ENDIO_FREE_SPACE;
@@ -2846,6 +2847,9 @@ static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
 	if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
 		return 0;
 
+	if (!root->fs_info->csum_root)
+		return 0;
+
 	if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
 	    test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
 		clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 58f890f73650..de7a50353239 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -345,6 +345,7 @@ enum {
 	Opt_rescue,
 	Opt_usebackuproot,
 	Opt_nologreplay,
+	Opt_rescue_all,
 
 	/* Deprecated options */
 	Opt_recovery,
@@ -440,6 +441,7 @@ static const match_table_t tokens = {
 static const match_table_t rescue_tokens = {
 	{Opt_usebackuproot, "usebackuproot"},
 	{Opt_nologreplay, "nologreplay"},
+	{Opt_rescue_all, "all"},
 	{Opt_err, NULL},
 };
 
@@ -472,6 +474,11 @@ static int parse_rescue_options(struct btrfs_fs_info *info, const char *options)
 			btrfs_set_and_info(info, NOLOGREPLAY,
 					   "disabling log replay at mount time");
 			break;
+		case Opt_rescue_all:
+			btrfs_set_and_info(info, RESCUE_ALL,
+					   "only reading fs roots, also setting  nologreplay");
+			btrfs_set_opt(info->mount_opt, NOLOGREPLAY);
+			break;
 		case Opt_err:
 			btrfs_info(info, "unrecognized rescue option '%s'", p);
 			ret = -EINVAL;
@@ -1400,6 +1407,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
 		seq_puts(seq, ",notreelog");
 	if (btrfs_test_opt(info, NOLOGREPLAY))
 		seq_puts(seq, ",rescue=nologreplay");
+	if (btrfs_test_opt(info, RESCUE_ALL))
+		seq_puts(seq, ",rescue=all");
 	if (btrfs_test_opt(info, FLUSHONCOMMIT))
 		seq_puts(seq, ",flushoncommit");
 	if (btrfs_test_opt(info, DISCARD_SYNC))
@@ -1839,6 +1848,14 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 	if (ret)
 		goto restore;
 
+	if (btrfs_test_opt(fs_info, RESCUE_ALL) !=
+	    (old_opts & BTRFS_MOUNT_RESCUE_ALL)) {
+		btrfs_err(fs_info,
+		"rescue=all mount option can't be changed during remount");
+		ret = -EINVAL;
+		goto restore;
+	}
+
 	btrfs_remount_begin(fs_info, old_opts, *flags);
 	btrfs_resize_thread_pool(fs_info,
 		fs_info->thread_pool_size, old_thread_pool_size);
@@ -1904,6 +1921,13 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 			goto restore;
 		}
 
+		if (btrfs_test_opt(fs_info, RESCUE_ALL)) {
+			btrfs_err(fs_info,
+		"remounting read-write with rescue=all is not allowed");
+			ret = -EINVAL;
+			goto restore;
+		}
+
 		ret = btrfs_cleanup_fs_roots(fs_info);
 		if (ret)
 			goto restore;
@@ -2208,8 +2232,9 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	 * still can allocate chunks and thus are fine using the currently
 	 * calculated f_bavail.
 	 */
-	if (!mixed && block_rsv->space_info->full &&
-	    total_free_meta - thresh < block_rsv->size)
+	if (btrfs_test_opt(fs_info, RESCUE_ALL) ||
+	    (!mixed && block_rsv->space_info->full &&
+	     total_free_meta - thresh < block_rsv->size))
 		buf->f_bavail = 0;
 
 	buf->f_type = BTRFS_SUPER_MAGIC;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 537ccf66ee20..2d7b57303fe5 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -7628,6 +7628,13 @@ int btrfs_verify_dev_extents(struct btrfs_fs_info *fs_info)
 	u64 prev_dev_ext_end = 0;
 	int ret = 0;
 
+	/*
+	 * For rescue=all mount option, we're already RO and are salvaging
+	 * data, no need for such strict check.
+	 */
+	if (btrfs_test_opt(fs_info, RESCUE_ALL))
+		return 0;
+
 	key.objectid = 1;
 	key.type = BTRFS_DEV_EXTENT_KEY;
 	key.offset = 0;
