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-rw-r--r--internal/contentenc/intrablock.go2
-rw-r--r--internal/contentenc/offsets.go2
-rw-r--r--internal/fusefrontend/file.go110
-rw-r--r--internal/fusefrontend/file_allocate_truncate.go123
4 files changed, 125 insertions, 112 deletions
diff --git a/internal/contentenc/intrablock.go b/internal/contentenc/intrablock.go
index ec9562d..9a22ea2 100644
--- a/internal/contentenc/intrablock.go
+++ b/internal/contentenc/intrablock.go
@@ -4,7 +4,7 @@ package contentenc
type intraBlock struct {
BlockNo uint64 // Block number in file
Skip uint64 // Offset into block plaintext
- Length uint64 // Length of data from this block
+ Length uint64 // Length of plaintext data in this block
fs *ContentEnc
}
diff --git a/internal/contentenc/offsets.go b/internal/contentenc/offsets.go
index 256ea26..ebafe9b 100644
--- a/internal/contentenc/offsets.go
+++ b/internal/contentenc/offsets.go
@@ -76,7 +76,7 @@ func (be *ContentEnc) ExplodePlainRange(offset uint64, length uint64) []intraBlo
nextBlock.BlockNo = be.PlainOffToBlockNo(offset)
nextBlock.Skip = offset - be.BlockNoToPlainOff(nextBlock.BlockNo)
- // Minimum of remaining data and remaining space in the block
+ // Minimum of remaining plaintext data and remaining space in the block
nextBlock.Length = MinUint64(length, be.plainBS-nextBlock.Skip)
blocks = append(blocks, nextBlock)
diff --git a/internal/fusefrontend/file.go b/internal/fusefrontend/file.go
index b5775c2..1835b53 100644
--- a/internal/fusefrontend/file.go
+++ b/internal/fusefrontend/file.go
@@ -354,103 +354,6 @@ func (f *file) Fsync(flags int) (code fuse.Status) {
return fuse.ToStatus(syscall.Fsync(int(f.fd.Fd())))
}
-// Truncate - FUSE call
-func (f *file) Truncate(newSize uint64) fuse.Status {
- f.fdLock.RLock()
- defer f.fdLock.RUnlock()
- if f.released {
- // The file descriptor has been closed concurrently.
- tlog.Warn.Printf("ino%d fh%d: Truncate on released file", f.ino, f.intFd())
- return fuse.EBADF
- }
- wlock.lock(f.ino)
- defer wlock.unlock(f.ino)
- var err error
- // Common case first: Truncate to zero
- if newSize == 0 {
- err = syscall.Ftruncate(int(f.fd.Fd()), 0)
- if err != nil {
- tlog.Warn.Printf("ino%d fh%d: Ftruncate(fd, 0) returned error: %v", f.ino, f.intFd(), err)
- return fuse.ToStatus(err)
- }
- // Truncate to zero kills the file header
- f.header = nil
- return fuse.OK
- }
- // We need the old file size to determine if we are growing or shrinking
- // the file
- fi, err := f.fd.Stat()
- if err != nil {
- tlog.Warn.Printf("ino%d fh%d: Truncate: Fstat failed: %v", f.ino, f.intFd(), err)
- return fuse.ToStatus(err)
- }
- oldSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
- {
- oldB := float32(oldSize) / float32(f.contentEnc.PlainBS())
- newB := float32(newSize) / float32(f.contentEnc.PlainBS())
- tlog.Debug.Printf("ino%d: FUSE Truncate from %.2f to %.2f blocks (%d to %d bytes)", f.ino, oldB, newB, oldSize, newSize)
- }
- // File size stays the same - nothing to do
- if newSize == oldSize {
- return fuse.OK
- }
- // File grows
- if newSize > oldSize {
- // File was empty, create new header
- if oldSize == 0 {
- err = f.createHeader()
- if err != nil {
- return fuse.ToStatus(err)
- }
- }
- // New blocks to add
- addBlocks := f.contentEnc.ExplodePlainRange(oldSize, newSize-oldSize)
- if len(addBlocks) >= 2 {
- f.zeroPad(oldSize)
- }
- lastBlock := addBlocks[len(addBlocks)-1]
- if lastBlock.IsPartial() {
- off := lastBlock.BlockPlainOff()
- _, status := f.doWrite(make([]byte, lastBlock.Length), int64(off+lastBlock.Skip))
- return status
- } else {
- off := lastBlock.BlockCipherOff()
- err = syscall.Ftruncate(f.intFd(), int64(off+f.contentEnc.CipherBS()))
- if err != nil {
- tlog.Warn.Printf("Truncate: grow Ftruncate returned error: %v", err)
- }
- return fuse.ToStatus(err)
- }
- } else {
- // File shrinks
- blockNo := f.contentEnc.PlainOffToBlockNo(newSize)
- cipherOff := f.contentEnc.BlockNoToCipherOff(blockNo)
- plainOff := f.contentEnc.BlockNoToPlainOff(blockNo)
- lastBlockLen := newSize - plainOff
- var data []byte
- if lastBlockLen > 0 {
- var status fuse.Status
- data, status = f.doRead(plainOff, lastBlockLen)
- if status != fuse.OK {
- tlog.Warn.Printf("Truncate: shrink doRead returned error: %v", err)
- return status
- }
- }
- // Truncate down to the last complete block
- err = syscall.Ftruncate(int(f.fd.Fd()), int64(cipherOff))
- if err != nil {
- tlog.Warn.Printf("Truncate: shrink Ftruncate returned error: %v", err)
- return fuse.ToStatus(err)
- }
- // Append partial block
- if lastBlockLen > 0 {
- _, status := f.doWrite(data, int64(plainOff))
- return status
- }
- return fuse.OK
- }
-}
-
func (f *file) Chmod(mode uint32) fuse.Status {
f.fdLock.RLock()
defer f.fdLock.RUnlock()
@@ -484,19 +387,6 @@ func (f *file) GetAttr(a *fuse.Attr) fuse.Status {
return fuse.OK
}
-// Only warn once
-var allocateWarnOnce sync.Once
-
-// Allocate - FUSE call, fallocate(2)
-// This is not implemented yet in gocryptfs, but it is neither in EncFS. This
-// suggests that the user demand is low.
-func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
- allocateWarnOnce.Do(func() {
- tlog.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
- })
- return fuse.ENOSYS
-}
-
const _UTIME_OMIT = ((1 << 30) - 2)
func (f *file) Utimens(a *time.Time, m *time.Time) fuse.Status {
diff --git a/internal/fusefrontend/file_allocate_truncate.go b/internal/fusefrontend/file_allocate_truncate.go
new file mode 100644
index 0000000..5be7df4
--- /dev/null
+++ b/internal/fusefrontend/file_allocate_truncate.go
@@ -0,0 +1,123 @@
+package fusefrontend
+
+// FUSE operations Truncate and Allocate on file handles
+// i.e. ftruncate and fallocate
+
+import (
+ "sync"
+ "syscall"
+
+ "github.com/hanwen/go-fuse/fuse"
+
+ "github.com/rfjakob/gocryptfs/internal/tlog"
+)
+
+// Only warn once
+var allocateWarnOnce sync.Once
+
+// Allocate - FUSE call, fallocate(2)
+// This is not implemented yet in gocryptfs, but it is neither in EncFS. This
+// suggests that the user demand is low.
+func (f *file) Allocate(off uint64, sz uint64, mode uint32) fuse.Status {
+ allocateWarnOnce.Do(func() {
+ tlog.Warn.Printf("fallocate(2) is not supported, returning ENOSYS - see https://github.com/rfjakob/gocryptfs/issues/1")
+ })
+ return fuse.ENOSYS
+}
+
+// Truncate - FUSE call
+func (f *file) Truncate(newSize uint64) fuse.Status {
+ f.fdLock.RLock()
+ defer f.fdLock.RUnlock()
+ if f.released {
+ // The file descriptor has been closed concurrently.
+ tlog.Warn.Printf("ino%d fh%d: Truncate on released file", f.ino, f.intFd())
+ return fuse.EBADF
+ }
+ wlock.lock(f.ino)
+ defer wlock.unlock(f.ino)
+ var err error
+ // Common case first: Truncate to zero
+ if newSize == 0 {
+ err = syscall.Ftruncate(int(f.fd.Fd()), 0)
+ if err != nil {
+ tlog.Warn.Printf("ino%d fh%d: Ftruncate(fd, 0) returned error: %v", f.ino, f.intFd(), err)
+ return fuse.ToStatus(err)
+ }
+ // Truncate to zero kills the file header
+ f.header = nil
+ return fuse.OK
+ }
+ // We need the old file size to determine if we are growing or shrinking
+ // the file
+ fi, err := f.fd.Stat()
+ if err != nil {
+ tlog.Warn.Printf("ino%d fh%d: Truncate: Fstat failed: %v", f.ino, f.intFd(), err)
+ return fuse.ToStatus(err)
+ }
+ oldSize := f.contentEnc.CipherSizeToPlainSize(uint64(fi.Size()))
+ {
+ oldB := float32(oldSize) / float32(f.contentEnc.PlainBS())
+ newB := float32(newSize) / float32(f.contentEnc.PlainBS())
+ tlog.Debug.Printf("ino%d: FUSE Truncate from %.2f to %.2f blocks (%d to %d bytes)", f.ino, oldB, newB, oldSize, newSize)
+ }
+ // File size stays the same - nothing to do
+ if newSize == oldSize {
+ return fuse.OK
+ }
+ // File grows
+ if newSize > oldSize {
+ // File was empty, create new header
+ if oldSize == 0 {
+ err = f.createHeader()
+ if err != nil {
+ return fuse.ToStatus(err)
+ }
+ }
+ // New blocks to add
+ addBlocks := f.contentEnc.ExplodePlainRange(oldSize, newSize-oldSize)
+ if len(addBlocks) >= 2 {
+ f.zeroPad(oldSize)
+ }
+ lastBlock := addBlocks[len(addBlocks)-1]
+ if lastBlock.IsPartial() {
+ off := lastBlock.BlockPlainOff()
+ _, status := f.doWrite(make([]byte, lastBlock.Length), int64(off+lastBlock.Skip))
+ return status
+ } else {
+ off := lastBlock.BlockCipherOff()
+ err = syscall.Ftruncate(f.intFd(), int64(off+f.contentEnc.CipherBS()))
+ if err != nil {
+ tlog.Warn.Printf("Truncate: grow Ftruncate returned error: %v", err)
+ }
+ return fuse.ToStatus(err)
+ }
+ } else {
+ // File shrinks
+ blockNo := f.contentEnc.PlainOffToBlockNo(newSize)
+ cipherOff := f.contentEnc.BlockNoToCipherOff(blockNo)
+ plainOff := f.contentEnc.BlockNoToPlainOff(blockNo)
+ lastBlockLen := newSize - plainOff
+ var data []byte
+ if lastBlockLen > 0 {
+ var status fuse.Status
+ data, status = f.doRead(plainOff, lastBlockLen)
+ if status != fuse.OK {
+ tlog.Warn.Printf("Truncate: shrink doRead returned error: %v", err)
+ return status
+ }
+ }
+ // Truncate down to the last complete block
+ err = syscall.Ftruncate(int(f.fd.Fd()), int64(cipherOff))
+ if err != nil {
+ tlog.Warn.Printf("Truncate: shrink Ftruncate returned error: %v", err)
+ return fuse.ToStatus(err)
+ }
+ // Append partial block
+ if lastBlockLen > 0 {
+ _, status := f.doWrite(data, int64(plainOff))
+ return status
+ }
+ return fuse.OK
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 17:43:06 +0000