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vfs: update cached copy if we know it has changed before using it

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Before this change we would have to wait for the --vfs-cache-max-age
to expire before getting an update.
This commit is contained in:
Nick Craig-Wood 2018-02-24 11:22:26 +00:00
parent 354f1ad722
commit baf9ee5cf7
1 changed files with 12 additions and 0 deletions
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12
vfs/read_write.go
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@ -109,6 +109,18 @@ func (fh *RWFileHandle) openPending(truncate bool) (err error) {
cacheFileOpenFlags := fh.flags
// if not truncating the file, need to read it first
if fh.flags&os.O_TRUNC == 0 && !truncate {
// If the remote object exists AND its cached file exists locally AND there are no
// other handles with it open writers, then attempt to update it.
if fh.o != nil && fh.d.vfs.cache.opens(fh.remote) <= 1 {
cacheObj, err := fh.d.vfs.cache.f.NewObject(fh.remote)
if err == nil && cacheObj != nil {
cacheObj, err = copyObj(fh.d.vfs.cache.f, cacheObj, fh.remote, fh.o)
if err != nil {
return errors.Wrap(err, "open RW handle failed to update cached file")
}
}
}
// try to open a exising cache file
fd, err = os.OpenFile(fh.osPath, cacheFileOpenFlags&^os.O_CREATE, 0600)
if os.IsNotExist(err) {