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volume.go
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volume.go
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// Copyright (c) 2015-2021, NVIDIA CORPORATION.
// SPDX-License-Identifier: Apache-2.0
package inode
import (
"fmt"
"github.com/swiftstack/ProxyFS/logger"
"github.com/swiftstack/ProxyFS/stats"
"github.com/swiftstack/sortedmap"
)
func (vS *volumeStruct) GetFSID() (fsid uint64) {
fsid = vS.fsid
return
}
func (vS *volumeStruct) SnapShotCreate(name string) (id uint64, err error) {
err = enforceRWMode(false)
if nil != err {
return
}
if ("." == name) || (".." == name) {
err = fmt.Errorf("SnapShot cannot be named either '.' or '..'")
return
}
vS.Lock()
id, err = vS.headhunterVolumeHandle.SnapShotCreateByInodeLayer(name)
vS.Unlock()
return
}
func (vS *volumeStruct) SnapShotDelete(id uint64) (err error) {
var (
found bool
keyAsInodeNumber InodeNumber
keyAsKey sortedmap.Key
indexWherePurgesAreToHappen int
maxInodeNumberToPurgeFromInodeCache InodeNumber
minInodeNumberToPurgeFromInodeCache InodeNumber
ok bool
valueAsValue sortedmap.Value
valueAsInodeStructPtr *inMemoryInodeStruct
)
err = enforceRWMode(false)
if nil != err {
return
}
vS.Lock()
err = vS.headhunterVolumeHandle.SnapShotDeleteByInodeLayer(id)
if nil == err {
// Purge elements in inodeCache to avoid aliasing if/when SnapShotID is reused
minInodeNumberToPurgeFromInodeCache = InodeNumber(vS.headhunterVolumeHandle.SnapShotIDAndNonceEncode(id, uint64(0)))
maxInodeNumberToPurgeFromInodeCache = InodeNumber(vS.headhunterVolumeHandle.SnapShotIDAndNonceEncode(id+1, uint64(0)))
indexWherePurgesAreToHappen, found, err = vS.inodeCache.BisectRight(minInodeNumberToPurgeFromInodeCache)
if nil != err {
vS.Unlock()
err = fmt.Errorf("Volume %v InodeCache BisectRight() failed: %v", vS.volumeName, err)
logger.Error(err)
return
}
// If there is some InodeNumber at or beyond minInodeNumberToPurgeFromInodeCache, found == TRUE
for found {
keyAsKey, valueAsValue, ok, err = vS.inodeCache.GetByIndex(indexWherePurgesAreToHappen)
if nil != err {
vS.Unlock()
err = fmt.Errorf("Volume %v InodeCache GetByIndex() failed: %v", vS.volumeName, err)
logger.Error(err)
return
}
if !ok {
vS.Unlock()
return
}
keyAsInodeNumber, ok = keyAsKey.(InodeNumber)
if !ok {
vS.Unlock()
err = fmt.Errorf("Volume %v InodeCache GetByIndex() returned non-InodeNumber", vS.volumeName)
return
}
// Redefine found to indicate we've found an InodeCache entry to evict (used next iteration)
found = (keyAsInodeNumber < maxInodeNumberToPurgeFromInodeCache)
// func (vS *volumeStruct) inodeCacheDropWhileLocked(inode *inMemoryInodeStruct) (ok bool, err error)
if found {
valueAsInodeStructPtr, ok = valueAsValue.(*inMemoryInodeStruct)
if !ok {
vS.Unlock()
err = fmt.Errorf("Volume %v InodeCache GetByIndex() returned non-inMemoryInodeStructPtr", vS.volumeName)
return
}
ok, err = vS.inodeCacheDropWhileLocked(valueAsInodeStructPtr)
if nil != err {
vS.Unlock()
err = fmt.Errorf("Volume %v inodeCacheDropWhileLocked() failed: %v", vS.volumeName, err)
return
}
if !ok {
vS.Unlock()
err = fmt.Errorf("Volume %v inodeCacheDropWhileLocked() returned !ok", vS.volumeName)
return
}
}
}
}
vS.Unlock()
return
}
func (vS *volumeStruct) CheckpointCompleted() {
var (
dirEntryCacheHitsDelta uint64
dirEntryCacheMissesDelta uint64
dirEntryCacheStats *sortedmap.BPlusTreeCacheStats
fileExtentMapCacheHitsDelta uint64
fileExtentMapCacheMissesDelta uint64
fileExtentMapCacheStats *sortedmap.BPlusTreeCacheStats
)
dirEntryCacheStats = globals.dirEntryCache.Stats()
fileExtentMapCacheStats = globals.fileExtentMapCache.Stats()
globals.Lock()
dirEntryCacheHitsDelta = dirEntryCacheStats.CacheHits - globals.dirEntryCachePriorCacheHits
dirEntryCacheMissesDelta = dirEntryCacheStats.CacheMisses - globals.dirEntryCachePriorCacheMisses
fileExtentMapCacheHitsDelta = fileExtentMapCacheStats.CacheHits - globals.fileExtentMapCachePriorCacheHits
fileExtentMapCacheMissesDelta = fileExtentMapCacheStats.CacheMisses - globals.fileExtentMapCachePriorCacheMisses
if 0 != dirEntryCacheHitsDelta {
stats.IncrementOperationsBy(&stats.DirEntryCacheHits, dirEntryCacheHitsDelta)
globals.dirEntryCachePriorCacheHits = dirEntryCacheStats.CacheHits
}
if 0 != dirEntryCacheMissesDelta {
stats.IncrementOperationsBy(&stats.DirEntryCacheMisses, dirEntryCacheMissesDelta)
globals.dirEntryCachePriorCacheMisses = dirEntryCacheStats.CacheMisses
}
if 0 != fileExtentMapCacheHitsDelta {
stats.IncrementOperationsBy(&stats.FileExtentMapCacheHits, fileExtentMapCacheHitsDelta)
globals.fileExtentMapCachePriorCacheHits = fileExtentMapCacheStats.CacheHits
}
if 0 != fileExtentMapCacheMissesDelta {
stats.IncrementOperationsBy(&stats.FileExtentMapCacheMisses, fileExtentMapCacheMissesDelta)
globals.fileExtentMapCachePriorCacheMisses = fileExtentMapCacheStats.CacheMisses
}
globals.Unlock()
}