return
}
fileName := filepath.Join(location, safeName)
- var mm mmap.MMap
+ var mm FileMapping
mm, err = mmapFile(fileName, miFile.Length)
if err != nil {
err = fmt.Errorf("file %q: %s", miFile.DisplayPath(md), err)
return
}
- if mm != nil {
- mms.Append(mm)
- }
+ mms.Append(mm)
}
mms.InitIndex()
return
}
-func mmapFile(name string, size int64) (ret mmap.MMap, err error) {
+func mmapFile(name string, size int64) (_ FileMapping, err error) {
dir := filepath.Dir(name)
err = os.MkdirAll(dir, 0o750)
if err != nil {
if err != nil {
return
}
- defer file.Close()
+ defer func() {
+ if err != nil {
+ file.Close()
+ }
+ }()
var fi os.FileInfo
fi, err = file.Stat()
if err != nil {
return
}
}
- if size == 0 {
- // Can't mmap() regions with length 0.
- return
- }
- intLen := int(size)
- if int64(intLen) != size {
- err = errors.New("size too large for system")
+ return func() (ret mmapWithFile, err error) {
+ ret.f = file
+ if size == 0 {
+ // Can't mmap() regions with length 0.
+ return
+ }
+ intLen := int(size)
+ if int64(intLen) != size {
+ err = errors.New("size too large for system")
+ return
+ }
+ ret.mmap, err = mmap.MapRegion(file, intLen, mmap.RDWR, 0, 0)
+ if err != nil {
+ err = fmt.Errorf("error mapping region: %s", err)
+ return
+ }
+ if int64(len(ret.mmap)) != size {
+ panic(len(ret.mmap))
+ }
return
+ }()
+}
+
+// Combines a mmapped region and file into a storage Mmap abstraction, which handles closing the
+// mmap file handle.
+func WrapFileMapping(region mmap.MMap, file *os.File) FileMapping {
+ return mmapWithFile{
+ f: file,
+ mmap: region,
}
- ret, err = mmap.MapRegion(file, intLen, mmap.RDWR, 0, 0)
- if err != nil {
- err = fmt.Errorf("error mapping region: %s", err)
- return
+}
+
+type FileMapping = mmap_span.Mmap
+
+// Handles closing the mmap's file handle (needed for Windows). Could be implemented differently by
+// OS.
+type mmapWithFile struct {
+ f *os.File
+ mmap mmap.MMap
+}
+
+func (m mmapWithFile) Flush() error {
+ return m.mmap.Flush()
+}
+
+func (m mmapWithFile) Unmap() (err error) {
+ if m.mmap != nil {
+ err = m.mmap.Unmap()
}
- if int64(len(ret)) != size {
- panic(len(ret))
+ return errors.Join(err, m.f.Close())
+}
+
+func (m mmapWithFile) Bytes() []byte {
+ if m.mmap == nil {
+ return nil
}
- return
+ return m.mmap
}