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vfs: file: fix some locking issues reading f.d without the lock 

Before this change we were reading Files.d without the lock. This
isn't allowed as d can change when the file is renamed.
This commit is contained in:
Nick Craig-Wood 2020-08-19 16:55:30 +01:00
parent 47d08ac1f1
commit 9a6fcd035b
1 changed files with 8 additions and 6 deletions
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14
vfs/file.go
View File

@ -186,6 +186,7 @@ func (f *File) rename(ctx context.Context, destDir *Dir, newName string) error {
f.mu.RLock()
o := f.o
d := f.d
f.mu.RUnlock()
var newObject fs.Object
// if o is nil then are writing the file so no need to rename the object
@ -210,8 +211,8 @@ func (f *File) rename(ctx context.Context, destDir *Dir, newName string) error {
}
}
// Rename in the cache
if f.d.vfs.cache != nil {
if err := f.d.vfs.cache.Rename(oldPath, newPath, newObject); err != nil {
if d.vfs.cache != nil {
if err := d.vfs.cache.Rename(oldPath, newPath, newObject); err != nil {
fs.Infof(f.Path(), "File.Rename failed in Cache: %v", err)
}
}
@ -241,7 +242,7 @@ func (f *File) rename(ctx context.Context, destDir *Dir, newName string) error {
CacheMode := d.vfs.Opt.CacheMode
if writing &&
(CacheMode < vfscommon.CacheModeMinimal ||
(CacheMode == vfscommon.CacheModeMinimal && !f.d.vfs.cache.Exists(oldPath))) {
(CacheMode == vfscommon.CacheModeMinimal && !destDir.vfs.cache.Exists(oldPath))) {
fs.Debugf(oldPath, "File is currently open, delaying rename %p", f)
f.mu.Lock()
f.pendingRenameFun = renameCall
@ -342,11 +343,11 @@ func (f *File) Size() int64 {
// SetModTime sets the modtime for the file
func (f *File) SetModTime(modTime time.Time) error {
f.mu.Lock()
defer f.mu.Unlock()
if f.d.vfs.Opt.ReadOnly {
return EROFS
}
f.mu.Lock()
defer f.mu.Unlock()
f.pendingModTime = modTime
@ -408,10 +409,11 @@ func (f *File) setObject(o fs.Object) {
f.mu.Lock()
f.o = o
_ = f._applyPendingModTime()
d := f.d
f.mu.Unlock()
// Release File.mu before calling Dir method
f.d.addObject(f)
d.addObject(f)
}
// Update the object but don't update the directory cache - for use by