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lock: Moving locking to handler layer. (#3381)

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This is implemented so that the issues like in the
following flow don't affect the behavior of operation.

```
GetObjectInfo()
.... --> Time window for mutation (no lock held)
.... --> Time window for mutation (no lock held)
GetObject()
```

This happens when two simultaneous uploads are made
to the same object the object has returned wrong
info to the client.

Another classic example is "CopyObject" API itself
which reads from a source object and copies to
destination object.

Fixes #3370
Fixes #2912
This commit is contained in:
Harshavardhana
2016-12-10 16:15:12 -08:00
committed by GitHub
parent cd0f350c02
commit 4daa0d2cee
18 changed files with 337 additions and 297 deletions
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6
cmd/xl-v1-healing.go
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@@ -73,7 +73,7 @@ func (xl xlObjects) HealBucket(bucket string) error {
// Heal bucket - create buckets on disks where it does not exist.
func healBucket(storageDisks []StorageAPI, bucket string, writeQuorum int) error {
bucketLock := nsMutex.NewNSLock(bucket, "")
bucketLock := globalNSMutex.NewNSLock(bucket, "")
bucketLock.Lock()
defer bucketLock.Unlock()
@@ -126,7 +126,7 @@ func healBucket(storageDisks []StorageAPI, bucket string, writeQuorum int) error
// heals `policy.json`, `notification.xml` and `listeners.json`.
func healBucketMetadata(storageDisks []StorageAPI, bucket string, readQuorum int) error {
healBucketMetaFn := func(metaPath string) error {
metaLock := nsMutex.NewNSLock(minioMetaBucket, metaPath)
metaLock := globalNSMutex.NewNSLock(minioMetaBucket, metaPath)
metaLock.RLock()
defer metaLock.RUnlock()
// Heals the given file at metaPath.
@@ -346,7 +346,7 @@ func (xl xlObjects) HealObject(bucket, object string) error {
}
// Lock the object before healing.
objectLock := nsMutex.NewNSLock(bucket, object)
objectLock := globalNSMutex.NewNSLock(bucket, object)
objectLock.RLock()
defer objectLock.RUnlock()