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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package main
import (
"context"
"encoding/json"
"os"
"sync"
"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: "scan-for-nodes",
Short: "Scan devices for (potentially lost) nodes",
Long: "" +
"The found information is printed as JSON on stdout, and can\n" +
"be read by `btrfs-rec inspect rebuild-mappings`.\n" +
"\n" +
"This information is mostly useful for rebuilding a broken\n" +
"chunk/dev-extent/blockgroup trees, but can also have some\n" +
"minimal utility in repairing other trees.\n" +
"\n" +
"This is very similar the initial scan done by\n" +
"`btrfs rescue chunk-recover`. Like `btrfs rescue chunk-recover`,\n" +
"this is likely probably slow because it reads the entirety of\n" +
"each device.",
Args: cliutil.WrapPositionalArgs(cobra.NoArgs),
},
RunE: func(fs *btrfs.FS, cmd *cobra.Command, _ []string) error {
ctx := cmd.Context()
var resultsMu sync.Mutex
results := make(map[btrfsvol.DeviceID]btrfsinspect.ScanOneDevResult)
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.ScanOneDev(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...")
return json.NewEncoder(os.Stdout).Encode(results)
},
})
}
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