feat(blobnode): supports mounting meta directories separately for each disk

@formatter:off

Signed-off-by: yuzhiqiang <yuzhiqiang_yewu@cmss.chinamobile.com>

blobstore/blobnode/core/config.go

@@ -84,6 +84,7 @@ type RuntimeConfig struct {
 	AllowCleanTrash              bool    `json:"allow_clean_trash"`
 	DisableModifyInCompacting    bool    `json:"disable_modify_in_compacting"`
 	MustMountPoint               bool    `json:"must_mount_point"`
+	MustMountPointMeta           bool    `json:"must_mount_point_meta"`
 	IOStatFileDryRun             bool    `json:"iostat_file_dryrun"`
 	SetDefaultSwitch             bool    `json:"set_default_switch"`
 	EnableDeleteShardVerify      bool    `json:"enable_delete_shard_verify"`

blobstore/blobnode/core/disk/disk.go

@@ -949,13 +949,26 @@ func newDiskStorage(ctx context.Context, conf core.Config) (ds *DiskStorage, err
 
 	if conf.MustMountPoint {
 		if !myos.IsMountPoint(conf.Path) {
-			span.Errorf("%s must mount point.", conf.Path)
-			return nil, errors.New("must mount point")
+			span.Errorf("%s must be a mount point.", conf.Path)
+			return nil, errors.New("must be a mount point")
+		}
+	}
+
+	// If metaRoot is not configured, the meta directory will be
+	// created under conf.Path, no need to check.
+	if metaRoot != "" {
+		// First check whether the metadata space is mounted separately for each disk,
+		// and then check whether the metadata space is mounted together for all disks.
+		checkPath := ""
+		if conf.MustMountPointMeta {
+			checkPath = filepath.Join(metaRoot, path)
+		} else if conf.MustMountPoint {
+			checkPath = metaRoot
 		}
 
-		if metaRoot != "" && !myos.IsMountPoint(metaRoot) {
-			span.Errorf("%s must mount point.", metaRoot)
-			return nil, errors.New("must mount point")
+		if checkPath != "" && !myos.IsMountPoint(checkPath) {
+			span.Errorf("%s must be a mount point.", checkPath)
+			return nil, errors.New("must be a mount point")
 		}
 	}
 

docs-zh/source/ops/configs/blobstore/blobnode.md

@@ -67,6 +67,7 @@ BlobNode的配置是基于[公有配置](./base.md)，以下配置说明主要
 		"metric_report_interval_S": "metric上报的定时任务周期",
 		"set_default_switch": "是否默认设置开关.建议该项填true,会设置need_compact_check,allow_force_compact,allow_clean_trash",
 		"must_mount_point": "数据存放目录是否强制是挂载点",
+		"must_mount_point_meta": "如果配置了 meta_root_prefix，开启 must_mount_point_meta 后会检查每个磁盘的元数据目录是否为挂载点，默认值 false",
 		"write_thread_cnt": "限制写线程个数, 默认值4",
 		"read_thread_cnt": "限制读线程个数, 默认值4",
 		"delete_thread_cnt": "限制删线程个数, 默认值1",

docs/source/ops/configs/blobstore/blobnode.md

@@ -68,9 +68,10 @@ BlobNode configuration is based on the [public configuration](./base.md), and th
     "metric_report_interval_S": "interval for metric reporting",
     "set_default_switch": "whether to set switch.suggest you set it to true,will set: need_compact_check,allow_force_compact,allow_clean_trash",
     "must_mount_point": "whether the data storage directory must be a mount point",
-    "write_thread_cnt": "limit the number of write threads，default 4",
-    "read_thread_cnt": "limit the number of read threads，default 4",
-    "delete_thread_cnt": "limit the number of delete threads，default 1",
+    "must_mount_point_meta": "if meta_root_prefix is ​​configured, turning on must_mount_point_meta will check if the metadata directory of each disk is a mount point, default false",
+    "write_thread_cnt": "limit the number of write threads, default 4",
+    "read_thread_cnt": "limit the number of read threads, default 4",
+    "delete_thread_cnt": "limit the number of delete threads, default 1",
     "data_qos": {
       "read_mbps": "per disk normal read IO bandwidth",
       "write_mbps": "per disk normal write IO bandwidth",