72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2016 Minio, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package cmd
|
|
|
|
import (
|
|
"path"
|
|
"time"
|
|
)
|
|
|
|
// getLoadBalancedDisks - fetches load balanced (sufficiently randomized) disk slice.
|
|
func (xl xlObjects) getLoadBalancedDisks() (disks []StorageAPI) {
|
|
// Based on the random shuffling return back randomized disks.
|
|
for _, i := range hashOrder(time.Now().UTC().String(), len(xl.storageDisks)) {
|
|
disks = append(disks, xl.storageDisks[i-1])
|
|
}
|
|
return disks
|
|
}
|
|
|
|
// This function does the following check, suppose
|
|
// object is "a/b/c/d", stat makes sure that objects ""a/b/c""
|
|
// "a/b" and "a" do not exist.
|
|
func (xl xlObjects) parentDirIsObject(bucket, parent string) bool {
|
|
var isParentDirObject func(string) bool
|
|
isParentDirObject = func(p string) bool {
|
|
if p == "." {
|
|
return false
|
|
}
|
|
if xl.isObject(bucket, p) {
|
|
// If there is already a file at prefix "p" return error.
|
|
return true
|
|
}
|
|
// Check if there is a file as one of the parent paths.
|
|
return isParentDirObject(path.Dir(p))
|
|
}
|
|
return isParentDirObject(parent)
|
|
}
|
|
|
|
// isObject - returns `true` if the prefix is an object i.e if
|
|
// `xl.json` exists at the leaf, false otherwise.
|
|
func (xl xlObjects) isObject(bucket, prefix string) (ok bool) {
|
|
for _, disk := range xl.getLoadBalancedDisks() {
|
|
if disk == nil {
|
|
continue
|
|
}
|
|
// Check if 'prefix' is an object on this 'disk', else continue the check the next disk
|
|
_, err := disk.StatFile(bucket, path.Join(prefix, xlMetaJSONFile))
|
|
if err == nil {
|
|
return true
|
|
}
|
|
// Ignore for file not found, disk not found or faulty disk.
|
|
if isErrIgnored(err, xlTreeWalkIgnoredErrs) {
|
|
continue
|
|
}
|
|
errorIf(err, "Unable to stat a file %s/%s/%s", bucket, prefix, xlMetaJSONFile)
|
|
} // Exhausted all disks - return false.
|
|
return false
|
|
}
|