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fusefrontend: doWrite: report readFileID errors as I/O error

It used to be reported as "function not implemented", accompaniedwith this log output: go-fuse: can't convert error type: ParseHeader: header is all-zero. Header hexdump: 000000000000000000000000000000000000Now we report EIO and log this: doWrite 1372183: corrupt header: ParseHeader: header is all-zero. Header hexdump: 000000000000000000000000000000000000

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internal/fusefrontend
- file.go

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`‎internal/fusefrontend/file.go‎`

Lines changed: 4 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -273,6 +273,10 @@ func (f *File) doWrite(data []byte, off int64) (uint32, syscall.Errno) {`
`273`	`273`	`iferr==io.EOF {`
`274`	`274`	`fileID,err=f.createHeader()`
`275`	`275`	`fileWasEmpty=true`
	`276`	`+}elseiferr!=nil {`
	`277`	`+// Other errors mean readFileID() found a corrupt header`
	`278`	`+tlog.Warn.Printf("doWrite %d: corrupt header: %v",f.qIno.Ino,err)`
	`279`	`+return0,syscall.EIO`
`276`	`280`	`}`
`277`	`281`	`iferr!=nil {`
`278`	`282`	`return0,fs.ToErrno(err)`

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Commit85297cd

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`‎internal/fusefrontend/file.go‎`

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