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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsutil
import (
"context"
"fmt"
"os"
"github.com/datawire/dlib/dlog"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
"git.lukeshu.com/btrfs-progs-ng/lib/diskio"
"git.lukeshu.com/btrfs-progs-ng/lib/textui"
)
func Open(ctx context.Context, flag int, filenames ...string) (*btrfs.FS, error) {
fs := new(btrfs.FS)
for i, filename := range filenames {
dlog.Debugf(ctx, "Adding device file %d/%d %q...", i, len(filenames), filename)
osFile, err := os.OpenFile(filename, flag, 0)
if err != nil {
_ = fs.Close()
return nil, fmt.Errorf("device file %q: %w", filename, err)
}
typedFile := &diskio.OSFile[btrfsvol.PhysicalAddr]{
File: osFile,
}
bufFile := diskio.NewBufferedFile[btrfsvol.PhysicalAddr](
ctx,
typedFile,
//nolint:gomnd // False positive: gomnd.ignored-functions=[textui.Tunable] doesn't support type params.
textui.Tunable[btrfsvol.PhysicalAddr](16*1024), // block size: 16KiB
textui.Tunable(1024), // number of blocks to buffer; total of 16MiB
)
devFile := &btrfs.Device{
File: bufFile,
}
if err := fs.AddDevice(ctx, devFile); err != nil {
return nil, fmt.Errorf("device file %q: %w", filename, err)
}
}
return fs, nil
}
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