hardcoresushi/libgocryptfs
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Handle EINTR returned by Fallocate

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Fallocate can return EINTR (interrupted system call) and does so
quite often when cpu profiling is enabled.
This commit is contained in:
Jakob Unterwurzacher 2015-12-13 17:17:01 +01:00
parent b02ad12814
commit 8518d6d7bd
1 changed files with 15 additions and 4 deletions
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19
pathfs_frontend/file.go
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@ -97,9 +97,9 @@ func (f *file) createHeader() error {
// Prevent partially written (=corrupt) header by preallocating the space beforehand
f.fdLock.Lock()
defer f.fdLock.Unlock()
err := syscall.Fallocate(int(f.fd.Fd()), FALLOC_FL_KEEP_SIZE, 0, cryptfs.HEADER_LEN)
err := fallocateRetry(int(f.fd.Fd()), FALLOC_FL_KEEP_SIZE, 0, cryptfs.HEADER_LEN)
if err != nil {
cryptfs.Warn.Printf("createHeader: Fallocate failed: %s\n", err.Error())
cryptfs.Warn.Printf("createHeader: fallocateRetry failed: %s\n", err.Error())
return err
}
@ -205,6 +205,17 @@ func (f *file) Read(buf []byte, off int64) (resultData fuse.ReadResult, code fus
return fuse.ReadResultData(out), status
}
// fallocateRetry - syscall.Fallocate() with retry for EINTR.
func fallocateRetry(fd int, mode uint32, off int64, len int64) (err error) {
for {
err = syscall.Fallocate(fd, mode, off, len)
if err == syscall.EINTR {
continue
}
return err
}
}
const FALLOC_FL_KEEP_SIZE = 0x01
// doWrite - encrypt "data" and write it to plaintext offset "off"
@ -258,10 +269,10 @@ func (f *file) doWrite(data []byte, off int64) (uint32, fuse.Status) {
// Prevent partially written (=corrupt) blocks by preallocating the space beforehand
f.fdLock.Lock()
err := syscall.Fallocate(int(f.fd.Fd()), FALLOC_FL_KEEP_SIZE, int64(blockOffset), int64(blockLen))
err := fallocateRetry(int(f.fd.Fd()), FALLOC_FL_KEEP_SIZE, int64(blockOffset), int64(blockLen))
f.fdLock.Unlock()
if err != nil {
cryptfs.Warn.Printf("doWrite: Fallocate failed: %s\n", err.Error())
cryptfs.Warn.Printf("doWrite: fallocateRetry failed: %s\n", err.Error())
status = fuse.ToStatus(err)
break
}