1 files changed, 72 insertions, 0 deletions
diff --git a/cmd/btrfs-rec/inspect_scandevices.go b/cmd/btrfs-rec/inspect_scandevices.go
new file mode 100644
index 0000000..f5caadb
--- /dev/null
+++ b/cmd/btrfs-rec/inspect_scandevices.go
@@ -0,0 +1,72 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package main
+
+import (
+	"bufio"
+	"context"
+	"os"
+	"sync"
+
+	"git.lukeshu.com/go/lowmemjson"
+	"github.com/datawire/dlib/dgroup"
+	"github.com/datawire/dlib/dlog"
+	"github.com/datawire/ocibuild/pkg/cliutil"
+	"github.com/spf13/cobra"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfsprogs/btrfsinspect"
+)
+
+func init() {
+	inspectors = append(inspectors, subcommand{
+		Command: cobra.Command{
+			Use:  "scandevices",
+			Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
+		},
+		RunE: func(fs *btrfs.FS, cmd *cobra.Command, _ []string) (err error) {
+			maybeSetErr := func(_err error) {
+				if err == nil && _err != nil {
+					err = _err
+				}
+			}
+			ctx := cmd.Context()
+
+			var resultsMu sync.Mutex
+			results := make(map[btrfsvol.DeviceID]btrfsinspect.ScanOneDeviceResult)
+			grp := dgroup.NewGroup(ctx, dgroup.GroupConfig{})
+			for _, dev := range fs.LV.PhysicalVolumes() {
+				dev := dev
+				grp.Go(dev.Name(), func(ctx context.Context) error {
+					superblock, err := dev.Superblock()
+					if err != nil {
+						return err
+					}
+					dlog.Infof(ctx, "dev[%q] Scanning for unreachable nodes...", dev.Name())
+					devResult, err := btrfsinspect.ScanOneDevice(ctx, dev, *superblock)
+					dlog.Infof(ctx, "dev[%q] Finished scanning", dev.Name())
+					resultsMu.Lock()
+					results[superblock.DevItem.DevID] = devResult
+					resultsMu.Unlock()
+					return err
+				})
+			}
+			if err := grp.Wait(); err != nil {
+				return err
+			}
+
+			dlog.Info(ctx, "Writing scan results to stdout...")
+			buffer := bufio.NewWriter(os.Stdout)
+			defer func() {
+				maybeSetErr(buffer.Flush())
+			}()
+			return lowmemjson.Encode(&lowmemjson.ReEncoder{
+				Out:    buffer,
+				Indent: "\t",
+			}, results)
+		},
+	})
+}