hardcoresushi/libgocryptfs
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fusefrontend: add File.SeekData() function

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This function will enable "gocryptfs -fsck" to handle
sparse files efficiently.
This commit is contained in:
Jakob Unterwurzacher 2018-07-01 19:13:28 +02:00
parent a2af1fb5da
commit e951043084
1 changed files with 15 additions and 0 deletions
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15
internal/fusefrontend/file_holes.go
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@ -3,6 +3,9 @@ package fusefrontend
// Helper functions for sparse files (files with holes) // Helper functions for sparse files (files with holes)
import ( import (
"runtime"
"syscall"
"github.com/hanwen/go-fuse/fuse" "github.com/hanwen/go-fuse/fuse"
"github.com/rfjakob/gocryptfs/internal/tlog" "github.com/rfjakob/gocryptfs/internal/tlog"
@ -53,3 +56,15 @@ func (f *File) zeroPad(plainSize uint64) fuse.Status {
_, status := f.doWrite(pad, int64(plainSize)) _, status := f.doWrite(pad, int64(plainSize))
return status return status
} }
// SeekData calls the lseek syscall with SEEK_DATA. It returns the offset of the
// next data bytes, skipping over file holes.
func (f *File) SeekData(oldOffset int64) (int64, error) {
if runtime.GOOS != "linux" {
// Does MacOS support something like this?
return 0, syscall.EOPNOTSUPP
}
const SEEK_DATA = 3
fd := f.intFd()
return syscall.Seek(fd, oldOffset, SEEK_DATA)
}