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local: fix race conditions updating the hashes

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This was causing occasional test failures for the -race test of mount
and cmount.
This commit is contained in:
Nick Craig-Wood 2018-03-08 16:31:44 +00:00
parent 70f07fd3ac
commit 6025bb6ad1
1 changed files with 17 additions and 9 deletions
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26
backend/local/local.go
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@ -64,8 +64,9 @@ type Fs struct {
warned map[string]struct{} // whether we have warned about this string
nounc bool // Skip UNC conversion on Windows
// do os.Lstat or os.Stat
lstat func(name string) (os.FileInfo, error)
dirNames *mapper // directory name mapping
lstat func(name string) (os.FileInfo, error)
dirNames *mapper // directory name mapping
objectHashesMu sync.Mutex // global lock for Object.hashes
}
// Object represents a local filesystem object
@ -586,17 +587,17 @@ func (o *Object) Hash(r hash.Type) (string, error) {
return "", errors.Wrap(err, "hash: failed to stat")
}
if !o.modTime.Equal(oldtime) || oldsize != o.size {
o.hashes = nil
}
o.fs.objectHashesMu.Lock()
hashes := o.hashes
o.fs.objectHashesMu.Unlock()
if o.hashes == nil {
o.hashes = make(map[hash.Type]string)
if !o.modTime.Equal(oldtime) || oldsize != o.size || hashes == nil {
hashes = make(map[hash.Type]string)
in, err := os.Open(o.path)
if err != nil {
return "", errors.Wrap(err, "hash: failed to open")
}
o.hashes, err = hash.Stream(in)
hashes, err = hash.Stream(in)
closeErr := in.Close()
if err != nil {
return "", errors.Wrap(err, "hash: failed to read")
@ -604,8 +605,11 @@ func (o *Object) Hash(r hash.Type) (string, error) {
if closeErr != nil {
return "", errors.Wrap(closeErr, "hash: failed to close")
}
o.fs.objectHashesMu.Lock()
o.hashes = hashes
o.fs.objectHashesMu.Unlock()
}
return o.hashes[r], nil
return hashes[r], nil
}
// Size returns the size of an object in bytes
@ -691,7 +695,9 @@ func (file *localOpenFile) Close() (err error) {
err = file.in.Close()
if err == nil {
if file.hash.Size() == file.o.Size() {
file.o.fs.objectHashesMu.Lock()
file.o.hashes = file.hash.Sums()
file.o.fs.objectHashesMu.Unlock()
}
}
return err
@ -788,7 +794,9 @@ func (o *Object) Update(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOptio
}
// All successful so update the hashes
o.fs.objectHashesMu.Lock()
o.hashes = hash.Sums()
o.fs.objectHashesMu.Unlock()
// Set the mtime
err = o.SetModTime(src.ModTime())