summaryrefslogtreecommitdiff
path: root/pathfs_frontend
diff options
context:
space:
mode:
Diffstat (limited to 'pathfs_frontend')
-rw-r--r--pathfs_frontend/file.go50
-rw-r--r--pathfs_frontend/file_holes.go4
-rw-r--r--pathfs_frontend/fs.go2
3 files changed, 27 insertions, 29 deletions
diff --git a/pathfs_frontend/file.go b/pathfs_frontend/file.go
index 438fe77..e8d7003 100644
--- a/pathfs_frontend/file.go
+++ b/pathfs_frontend/file.go
@@ -128,8 +128,10 @@ func (f *file) doRead(off uint64, length uint64) ([]byte, fuse.Status) {
}
// Read the backing ciphertext in one go
- alignedOffset, alignedLength, skip := f.cfs.CiphertextRange(off, length)
- cryptfs.Debug.Printf("CiphertextRange(%d, %d) -> %d, %d, %d\n", off, length, alignedOffset, alignedLength, skip)
+ blocks := f.cfs.ExplodePlainRange(off, length)
+ alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks)
+ skip := blocks[0].Skip
+ cryptfs.Debug.Printf("JointCiphertextRange(%d, %d) -> %d, %d, %d\n", off, length, alignedOffset, alignedLength, skip)
ciphertext := make([]byte, int(alignedLength))
f.fdLock.Lock()
n, err := f.fd.ReadAt(ciphertext, int64(alignedOffset))
@@ -141,27 +143,27 @@ func (f *file) doRead(off uint64, length uint64) ([]byte, fuse.Status) {
// Truncate ciphertext buffer down to actually read bytes
ciphertext = ciphertext[0:n]
- blockNo := (alignedOffset - cryptfs.HEADER_LEN) / f.cfs.CipherBS()
- cryptfs.Debug.Printf("ReadAt offset=%d bytes (%d blocks), want=%d, got=%d\n", alignedOffset, blockNo, alignedLength, n)
+ firstBlockNo := blocks[0].BlockNo
+ cryptfs.Debug.Printf("ReadAt offset=%d bytes (%d blocks), want=%d, got=%d\n", alignedOffset, firstBlockNo, alignedLength, n)
// Decrypt it
- plaintext, err := f.cfs.DecryptBlocks(ciphertext, blockNo, f.header.Id)
+ plaintext, err := f.cfs.DecryptBlocks(ciphertext, firstBlockNo, f.header.Id)
if err != nil {
- blockNo := (alignedOffset + uint64(len(plaintext))) / f.cfs.PlainBS()
- cipherOff := cryptfs.HEADER_LEN + blockNo * f.cfs.CipherBS()
- plainOff := blockNo * f.cfs.PlainBS()
- cryptfs.Warn.Printf("ino%d: doRead: corrupt block #%d (plainOff=%d/%d, cipherOff=%d/%d)\n",
- f.ino, blockNo, plainOff, f.cfs.PlainBS(), cipherOff, f.cfs.CipherBS())
+ curruptBlockNo := firstBlockNo + f.cfs.PlainOffToBlockNo(uint64(len(plaintext)))
+ cipherOff := f.cfs.BlockNoToCipherOff(curruptBlockNo)
+ plainOff := f.cfs.BlockNoToPlainOff(curruptBlockNo)
+ cryptfs.Warn.Printf("ino%d: doRead: corrupt block #%d (plainOff=%d, cipherOff=%d)\n",
+ f.ino, curruptBlockNo, plainOff, cipherOff)
return nil, fuse.EIO
}
// Crop down to the relevant part
var out []byte
lenHave := len(plaintext)
- lenWant := skip + int(length)
+ lenWant := int(skip + length)
if lenHave > lenWant {
- out = plaintext[skip : skip+int(length)]
- } else if lenHave > skip {
+ out = plaintext[skip:lenWant]
+ } else if lenHave > int(skip) {
out = plaintext[skip:lenHave]
}
// else: out stays empty, file was smaller than the requested offset
@@ -216,7 +218,7 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
var written uint32
status := fuse.OK
dataBuf := bytes.NewBuffer(data)
- blocks := f.cfs.SplitRange(uint64(off), uint64(len(data)))
+ blocks := f.cfs.ExplodePlainRange(uint64(off), uint64(len(data)))
for _, b := range blocks {
blockData := dataBuf.Next(int(b.Length))
@@ -239,11 +241,7 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
blockOffset, _ := b.CiphertextRange()
blockData = f.cfs.EncryptBlock(blockData, b.BlockNo, f.header.Id)
cryptfs.Debug.Printf("ino%d: Writing %d bytes to block #%d, md5=%s\n",
- f.ino, len(blockData) - cryptfs.BLOCK_OVERHEAD, b.BlockNo, cryptfs.Debug.Md5sum(blockData))
- if len(blockData) != int(f.cfs.CipherBS()) {
- cryptfs.Debug.Printf("ino%d: Writing partial block #%d (%d bytes)\n",
- f.ino, b.BlockNo, len(blockData) - cryptfs.BLOCK_OVERHEAD)
- }
+ f.ino, len(blockData)-cryptfs.BLOCK_OVERHEAD, b.BlockNo, cryptfs.Debug.Md5sum(blockData))
f.fdLock.Lock()
_, err := f.fd.WriteAt(blockData, int64(blockOffset))
f.fdLock.Unlock()
@@ -267,7 +265,7 @@ func (f *file) Write(data []byte, off int64) (uint32, fuse.Status) {
cryptfs.Warn.Printf("Write: Fstat failed: %v\n", err)
return 0, fuse.ToStatus(err)
}
- plainSize := f.cfs.PlainSize(uint64(fi.Size()))
+ plainSize := f.cfs.CipherSizeToPlainSize(uint64(fi.Size()))
if f.createsHole(plainSize, off) {
status := f.zeroPad(plainSize)
if status != fuse.OK {
@@ -332,7 +330,7 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
cryptfs.Warn.Printf("Truncate: Fstat failed: %v\n", err)
return fuse.ToStatus(err)
}
- oldSize := f.cfs.PlainSize(uint64(fi.Size()))
+ oldSize := f.cfs.CipherSizeToPlainSize(uint64(fi.Size()))
{
oldB := float32(oldSize) / float32(f.cfs.PlainBS())
newB := float32(newSize) / float32(f.cfs.PlainBS())
@@ -350,7 +348,7 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
}
}
- blocks := f.cfs.SplitRange(oldSize, newSize-oldSize)
+ blocks := f.cfs.ExplodePlainRange(oldSize, newSize-oldSize)
for _, b := range blocks {
// First and last block may be partial
if b.IsPartial() {
@@ -374,9 +372,9 @@ func (f *file) Truncate(newSize uint64) fuse.Status {
return fuse.OK
} else {
// File shrinks
- blockNo := f.cfs.BlockNoPlainOff(newSize)
- cipherOff := cryptfs.HEADER_LEN + blockNo * f.cfs.CipherBS()
- plainOff := blockNo * f.cfs.PlainBS()
+ blockNo := f.cfs.PlainOffToBlockNo(newSize)
+ cipherOff := f.cfs.BlockNoToCipherOff(blockNo)
+ plainOff := f.cfs.BlockNoToPlainOff(blockNo)
lastBlockLen := newSize - plainOff
var data []byte
if lastBlockLen > 0 {
@@ -430,7 +428,7 @@ func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
return fuse.ToStatus(err)
}
a.FromStat(&st)
- a.Size = f.cfs.PlainSize(a.Size)
+ a.Size = f.cfs.CipherSizeToPlainSize(a.Size)
return fuse.OK
}
diff --git a/pathfs_frontend/file_holes.go b/pathfs_frontend/file_holes.go
index f906aa6..3db4828 100644
--- a/pathfs_frontend/file_holes.go
+++ b/pathfs_frontend/file_holes.go
@@ -7,8 +7,8 @@ import (
// Will a write to offset "off" create a file hole?
func (f *file) createsHole(plainSize uint64, off int64) bool {
- nextBlock := f.cfs.BlockNoPlainOff(plainSize)
- targetBlock := f.cfs.BlockNoPlainOff(uint64(off))
+ nextBlock := f.cfs.PlainOffToBlockNo(plainSize)
+ targetBlock := f.cfs.PlainOffToBlockNo(uint64(off))
if targetBlock > nextBlock {
return true
}
diff --git a/pathfs_frontend/fs.go b/pathfs_frontend/fs.go
index eebc87b..3ec503f 100644
--- a/pathfs_frontend/fs.go
+++ b/pathfs_frontend/fs.go
@@ -41,7 +41,7 @@ func (fs *FS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Stat
return a, status
}
if a.IsRegular() {
- a.Size = fs.PlainSize(a.Size)
+ a.Size = fs.CipherSizeToPlainSize(a.Size)
} else if a.IsSymlink() {
target, _ := fs.Readlink(name, context)
a.Size = uint64(len(target))
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-03 18:59:30 +0000