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-rw-r--r--internal/fusefrontend/args.go2
-rw-r--r--internal/fusefrontend/file.go30
-rw-r--r--internal/fusefrontend/fs.go4
3 files changed, 23 insertions, 13 deletions
diff --git a/internal/fusefrontend/args.go b/internal/fusefrontend/args.go
index d8b0304..eb796cd 100644
--- a/internal/fusefrontend/args.go
+++ b/internal/fusefrontend/args.go
@@ -21,4 +21,6 @@ type Args struct {
// Raw64 is true when RawURLEncoding (without padding) should be used for
// file names
Raw64 bool
+ // NoPrealloc disables automatic preallocation before writing
+ NoPrealloc bool
}
diff --git a/internal/fusefrontend/file.go b/internal/fusefrontend/file.go
index d637528..5fe866b 100644
--- a/internal/fusefrontend/file.go
+++ b/internal/fusefrontend/file.go
@@ -49,10 +49,12 @@ type file struct {
// The opCount is used to judge whether "lastWrittenOffset" is still
// guaranteed to be correct.
lastOpCount uint64
+ // Parent filesystem
+ fs *FS
}
// NewFile returns a new go-fuse File instance.
-func NewFile(fd *os.File, writeOnly bool, contentEnc *contentenc.ContentEnc) (nodefs.File, fuse.Status) {
+func NewFile(fd *os.File, writeOnly bool, fs *FS) (nodefs.File, fuse.Status) {
var st syscall.Stat_t
err := syscall.Fstat(int(fd.Fd()), &st)
if err != nil {
@@ -65,10 +67,11 @@ func NewFile(fd *os.File, writeOnly bool, contentEnc *contentenc.ContentEnc) (no
return &file{
fd: fd,
writeOnly: writeOnly,
- contentEnc: contentEnc,
+ contentEnc: fs.contentEnc,
devIno: di,
fileTableEntry: t,
loopbackFile: nodefs.NewLoopbackFile(fd),
+ fs: fs,
}, fuse.OK
}
@@ -107,10 +110,12 @@ func (f *file) createHeader() (fileID []byte, err error) {
h := contentenc.RandomHeader()
buf := h.Pack()
// Prevent partially written (=corrupt) header by preallocating the space beforehand
- err = syscallcompat.EnospcPrealloc(int(f.fd.Fd()), 0, contentenc.HeaderLen)
- if err != nil {
- tlog.Warn.Printf("ino%d: createHeader: prealloc failed: %s\n", f.devIno.ino, err.Error())
- return nil, err
+ if !f.fs.args.NoPrealloc {
+ err = syscallcompat.EnospcPrealloc(int(f.fd.Fd()), 0, contentenc.HeaderLen)
+ if err != nil {
+ tlog.Warn.Printf("ino%d: createHeader: prealloc failed: %s\n", f.devIno.ino, err.Error())
+ return nil, err
+ }
}
// Actually write header
_, err = f.fd.WriteAt(buf, 0)
@@ -285,7 +290,7 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
writeChain[i] = blockData
numOutBytes += len(blockData)
}
- // Concatenenate all elements in the writeChain into one contigous buffer
+ // Concatenenate all elements in the writeChain into one contiguous buffer
tmp := make([]byte, numOutBytes)
writeBuf := bytes.NewBuffer(tmp[:0])
for _, w := range writeChain {
@@ -293,11 +298,14 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
}
// Preallocate so we cannot run out of space in the middle of the write.
// This prevents partially written (=corrupt) blocks.
+ var err error
cOff := blocks[0].BlockCipherOff()
- err := syscallcompat.EnospcPrealloc(int(f.fd.Fd()), int64(cOff), int64(writeBuf.Len()))
- if err != nil {
- tlog.Warn.Printf("ino%d fh%d: doWrite: prealloc failed: %s", f.devIno.ino, f.intFd(), err.Error())
- return 0, fuse.ToStatus(err)
+ if !f.fs.args.NoPrealloc {
+ err = syscallcompat.EnospcPrealloc(int(f.fd.Fd()), int64(cOff), int64(writeBuf.Len()))
+ if err != nil {
+ tlog.Warn.Printf("ino%d fh%d: doWrite: prealloc failed: %s", f.devIno.ino, f.intFd(), err.Error())
+ return 0, fuse.ToStatus(err)
+ }
}
// Write
_, err = f.fd.WriteAt(writeBuf.Bytes(), int64(cOff))
diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index e9e6113..f41e9a7 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -106,7 +106,7 @@ func (fs *FS) Open(path string, flags uint32, context *fuse.Context) (fuseFile n
return nil, fuse.ToStatus(err)
}
- return NewFile(f, writeOnly, fs.contentEnc)
+ return NewFile(f, writeOnly, fs)
}
// Create implements pathfs.Filesystem.
@@ -160,7 +160,7 @@ func (fs *FS) Create(path string, flags uint32, mode uint32, context *fuse.Conte
tlog.Warn.Printf("Create: Chown failed: %v", err)
}
}
- return NewFile(fd, writeOnly, fs.contentEnc)
+ return NewFile(fd, writeOnly, fs)
}
// Chmod implements pathfs.Filesystem.