diff options
Diffstat (limited to 'pkg/btrfs/io2_lv.go')
| -rw-r--r-- | pkg/btrfs/io2_lv.go | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/pkg/btrfs/io2_lv.go b/pkg/btrfs/io2_lv.go deleted file mode 100644 index 486a4ae..0000000 --- a/pkg/btrfs/io2_lv.go +++ /dev/null @@ -1,187 +0,0 @@ -package btrfs - -import ( - "fmt" - "io" - - "github.com/datawire/dlib/derror" - - "lukeshu.com/btrfs-tools/pkg/btrfs/btrfsitem" - "lukeshu.com/btrfs-tools/pkg/btrfs/btrfsvol" - "lukeshu.com/btrfs-tools/pkg/util" -) - -type FS struct { - // You should probably not access .LV directly, except when - // implementing special things like fsck. - LV btrfsvol.LogicalVolume[*Device] - - cacheSuperblocks []*util.Ref[btrfsvol.PhysicalAddr, Superblock] - cacheSuperblock *util.Ref[btrfsvol.PhysicalAddr, Superblock] -} - -var _ util.File[btrfsvol.LogicalAddr] = (*FS)(nil) - -func (fs *FS) AddDevice(dev *Device) error { - sb, err := dev.Superblock() - if err != nil { - return err - } - if err := fs.LV.AddPhysicalVolume(sb.Data.DevItem.DevID, dev); err != nil { - return err - } - fs.cacheSuperblocks = nil - fs.cacheSuperblock = nil - if err := fs.initDev(sb); err != nil { - return err - } - return nil -} - -func (fs *FS) Name() string { - if name := fs.LV.Name(); name != "" { - return name - } - sb, err := fs.Superblock() - if err != nil { - return fmt.Sprintf("fs_uuid=%v", "(unreadable)") - } - name := fmt.Sprintf("fs_uuid=%v", sb.Data.FSUUID) - fs.LV.SetName(name) - return name -} - -func (fs *FS) Size() (btrfsvol.LogicalAddr, error) { - return fs.LV.Size() -} - -func (fs *FS) ReadAt(p []byte, off btrfsvol.LogicalAddr) (int, error) { - return fs.LV.ReadAt(p, off) -} -func (fs *FS) WriteAt(p []byte, off btrfsvol.LogicalAddr) (int, error) { - return fs.LV.WriteAt(p, off) -} - -func (fs *FS) Resolve(laddr btrfsvol.LogicalAddr) (paddrs map[btrfsvol.QualifiedPhysicalAddr]struct{}, maxlen btrfsvol.AddrDelta) { - return fs.LV.Resolve(laddr) -} - -func (fs *FS) Superblocks() ([]*util.Ref[btrfsvol.PhysicalAddr, Superblock], error) { - if fs.cacheSuperblocks != nil { - return fs.cacheSuperblocks, nil - } - var ret []*util.Ref[btrfsvol.PhysicalAddr, Superblock] - devs := fs.LV.PhysicalVolumes() - if len(devs) == 0 { - return nil, fmt.Errorf("no devices") - } - for _, dev := range devs { - sbs, err := dev.Superblocks() - if err != nil { - return nil, fmt.Errorf("file %q: %w", dev.Name(), err) - } - ret = append(ret, sbs...) - } - fs.cacheSuperblocks = ret - return ret, nil -} - -func (fs *FS) Superblock() (*util.Ref[btrfsvol.PhysicalAddr, Superblock], error) { - if fs.cacheSuperblock != nil { - return fs.cacheSuperblock, nil - } - sbs, err := fs.Superblocks() - if err != nil { - return nil, err - } - if len(sbs) == 0 { - return nil, fmt.Errorf("no superblocks") - } - - fname := "" - sbi := 0 - for i, sb := range sbs { - if sb.File.Name() != fname { - fname = sb.File.Name() - sbi = 0 - } else { - sbi++ - } - - if err := sb.Data.ValidateChecksum(); err != nil { - return nil, fmt.Errorf("file %q superblock %v: %w", sb.File.Name(), sbi, err) - } - if i > 0 { - // FIXME(lukeshu): This is probably wrong, but - // lots of my multi-device code is probably - // wrong. - if !sb.Data.Equal(sbs[0].Data) { - return nil, fmt.Errorf("file %q superblock %v and file %q superblock %v disagree", - sbs[0].File.Name(), 0, - sb.File.Name(), sbi) - } - } - } - - fs.cacheSuperblock = sbs[0] - return sbs[0], nil -} - -func (fs *FS) ReInit() error { - fs.LV.ClearMappings() - for _, dev := range fs.LV.PhysicalVolumes() { - sb, err := dev.Superblock() - if err != nil { - return fmt.Errorf("file %q: %w", dev.Name(), err) - } - if err := fs.initDev(sb); err != nil { - return fmt.Errorf("file %q: %w", dev.Name(), err) - } - } - return nil -} - -func (fs *FS) initDev(sb *util.Ref[btrfsvol.PhysicalAddr, Superblock]) error { - syschunks, err := sb.Data.ParseSysChunkArray() - if err != nil { - return err - } - for _, chunk := range syschunks { - for _, mapping := range chunk.Chunk.Mappings(chunk.Key) { - if err := fs.LV.AddMapping(mapping); err != nil { - return err - } - } - } - if err := fs.TreeWalk(CHUNK_TREE_OBJECTID, TreeWalkHandler{ - Item: func(_ TreePath, item Item) error { - if item.Head.Key.ItemType != btrfsitem.CHUNK_ITEM_KEY { - return nil - } - for _, mapping := range item.Body.(btrfsitem.Chunk).Mappings(item.Head.Key) { - if err := fs.LV.AddMapping(mapping); err != nil { - return err - } - } - return nil - }, - }); err != nil { - return err - } - return nil -} - -func (fs *FS) Close() error { - var errs derror.MultiError - for _, dev := range fs.LV.PhysicalVolumes() { - if err := dev.Close(); err != nil && err == nil { - errs = append(errs, err) - } - } - if errs != nil { - return errs - } - return nil -} - -var _ io.Closer = (*FS)(nil) |