aboutsummaryrefslogtreecommitdiff
path: root/frontend/file.go
diff options
context:
space:
mode:
authorJakob Unterwurzacher2015-09-05 20:30:20 +0200
committerJakob Unterwurzacher2015-09-05 20:30:20 +0200
commit11fb037e7e7d84405b3bed9de2aa500e49d9502d (patch)
treef94eea4b2cccc1620b51f163837d26082e6cae58 /frontend/file.go
parent7e564f928fef80b0485210603a8aa58b14ca5109 (diff)
Cleanup and rename files
Diffstat (limited to 'frontend/file.go')
-rw-r--r--frontend/file.go133
1 files changed, 0 insertions, 133 deletions
diff --git a/frontend/file.go b/frontend/file.go
deleted file mode 100644
index ef74491..0000000
--- a/frontend/file.go
+++ /dev/null
@@ -1,133 +0,0 @@
-package frontend
-
-import (
- "fmt"
- "github.com/rfjakob/gocryptfs/cryptfs"
- "github.com/rfjakob/cluefs/lib/cluefs"
-
- "bazil.org/fuse"
- fusefs "bazil.org/fuse/fs"
- "golang.org/x/net/context"
-)
-
-func fixFlags(flags fuse.OpenFlags) (fuse.OpenFlags, bool) {
- fmt.Printf("fixFlags: Before: %s\n", flags.String())
- var writeOnly bool
- // We always need read access to do read-modify-write cycles
- if flags & fuse.OpenWriteOnly > 0 {
- flags = flags &^ fuse.OpenWriteOnly
- flags = flags | fuse.OpenReadWrite
- writeOnly = true
- }
- // We also cannot open the file in append mode, we need to seek back for RMW
- flags = flags &^ fuse.OpenAppend
- fmt.Printf("fixFlags: After: %s\n", flags.String())
- return flags, writeOnly
-}
-
-func max(x int, y int) int {
- if x > y {
- return x
- }
- return y
-}
-
-type File struct {
- *cluefs.File
- crfs *cryptfs.CryptFS
- // Remember if the file is supposed to be write-only
- writeOnly bool
-}
-
-func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fusefs.Handle, error) {
- fmt.Printf("File.Open\n")
-
- req.Flags, f.writeOnly = fixFlags(req.Flags)
-
- h, err := f.File.Open(ctx, req, resp)
- if err != nil {
- return nil, err
- }
- clueFile := h.(*cluefs.File)
- return &File {
- File: clueFile,
- crfs: f.crfs,
- }, nil
-}
-
-func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
- iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(req.Size))
- for _, ib := range iblocks {
- var partReq fuse.ReadRequest
- var partResp fuse.ReadResponse
- o, l := ib.CiphertextRange()
- partReq.Offset = int64(o)
- partReq.Size = int(l)
- partResp.Data = make([]byte, int(l))
- err := f.File.Read(ctx, &partReq, &partResp)
- if err != nil {
- return err
- }
- plaintext, err := f.crfs.DecryptBlock(partResp.Data)
- if err != nil {
- fmt.Printf("Read: Error reading block %d: %s\n", ib.BlockNo, err.Error())
- return err
- }
- plaintext = ib.CropBlock(plaintext)
- resp.Data = append(resp.Data, plaintext...)
- }
- return nil
-}
-
-func (f *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
- fmt.Printf("File.Write\n")
- resp.Size = 0
- iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(len(req.Data)))
- var blockData []byte
- for _, ib := range iblocks {
- if ib.IsPartial() {
- // RMW
- blockData = make([]byte, f.crfs.PlainBS())
- var readReq fuse.ReadRequest
- var readResp fuse.ReadResponse
- o, l := ib.PlaintextRange()
- readReq.Offset = int64(o)
- readReq.Size = int(l)
- err := f.Read(ctx, &readReq, &readResp)
- if err != nil {
- return err
- }
- copy(blockData, readResp.Data)
- copy(blockData[ib.Offset:ib.Offset+ib.Length], req.Data)
- blockLen := max(len(readResp.Data), int(ib.Offset+ib.Length))
- blockData = blockData[0:blockLen]
- } else {
- blockData = req.Data[0:f.crfs.PlainBS()]
- }
- ciphertext := f.crfs.EncryptBlock(blockData)
- var partReq fuse.WriteRequest
- var partResp fuse.WriteResponse
- o, _ := ib.CiphertextRange()
- partReq.Data = ciphertext
- partReq.Offset = int64(o)
- err := f.File.Write(ctx, &partReq, &partResp)
- if err != nil {
- fmt.Printf("Write failure: %s\n", err.Error())
- return err
- }
- // Remove written data from the front of the request
- req.Data = req.Data[len(blockData):len(req.Data)]
- resp.Size += len(blockData)
- }
- return nil
-}
-
-func (f *File) Attr(ctx context.Context, attr *fuse.Attr) error {
- fmt.Printf("Attr\n")
- err := f.File.Node.Attr(ctx, attr)
- if err != nil {
- return err
- }
- attr.Size = f.crfs.PlainSize(attr.Size)
- return nil
-}