| Line |
Branch |
Exec |
Source |
| 1 |
|
|
/** |
| 2 |
|
|
* This file is part of the CernVM File System. |
| 3 |
|
|
* |
| 4 |
|
|
* This provides a framework for a cache with an upper and a lower branch. |
| 5 |
|
|
*/ |
| 6 |
|
|
|
| 7 |
|
|
#ifndef CVMFS_CACHE_TIERED_H_ |
| 8 |
|
|
#define CVMFS_CACHE_TIERED_H_ |
| 9 |
|
|
|
| 10 |
|
|
#include <string> |
| 11 |
|
|
|
| 12 |
|
|
#include "cache.h" |
| 13 |
|
|
#include "gtest/gtest_prod.h" |
| 14 |
|
|
|
| 15 |
|
|
/** |
| 16 |
|
|
* Cache manager implementation that provides a hierarchical cache. |
| 17 |
|
|
* Given an "upper" and "lower" cache manager object: |
| 18 |
|
|
* - Reads are done first from the upper cache |
| 19 |
|
|
* - On upper cache miss, then this tries the lower cache. |
| 20 |
|
|
* If there's a lower cache hit, then the file is written |
| 21 |
|
|
* to the upper cache. |
| 22 |
|
|
* - Writes are done to both caches simultaneously. |
| 23 |
|
|
* |
| 24 |
|
|
* The quota manager is only applied to the upper cache. |
| 25 |
|
|
*/ |
| 26 |
|
|
class TieredCacheManager : public CacheManager { |
| 27 |
|
|
FRIEND_TEST(T_MountPoint, TieredCacheMgr); |
| 28 |
|
|
FRIEND_TEST(T_MountPoint, TieredComplex); |
| 29 |
|
|
|
| 30 |
|
|
public: |
| 31 |
|
3 |
virtual CacheManagerIds id() { return kTieredCacheManager; } |
| 32 |
|
|
virtual std::string Describe(); |
| 33 |
|
|
|
| 34 |
|
|
static CacheManager *Create(CacheManager *upper_cache, |
| 35 |
|
|
CacheManager *lower_cache); |
| 36 |
|
1 |
void SetLowerReadOnly() { lower_readonly_ = true; } |
| 37 |
|
|
|
| 38 |
|
|
virtual ~TieredCacheManager(); |
| 39 |
|
✗ |
virtual bool AcquireQuotaManager(QuotaManager *quota_mgr) { |
| 40 |
|
✗ |
bool result = upper_->AcquireQuotaManager(quota_mgr); |
| 41 |
|
✗ |
quota_mgr_ = upper_->quota_mgr(); |
| 42 |
|
✗ |
return result; |
| 43 |
|
|
} |
| 44 |
|
|
|
| 45 |
|
|
virtual int Open(const LabeledObject &object); |
| 46 |
|
2 |
virtual int64_t GetSize(int fd) {return upper_->GetSize(fd);} |
| 47 |
|
2 |
virtual int Close(int fd) {return upper_->Close(fd);} |
| 48 |
|
2 |
virtual int64_t Pread(int fd, void *buf, uint64_t size, uint64_t offset) |
| 49 |
|
2 |
{ return upper_->Pread(fd, buf, size, offset); } |
| 50 |
|
✗ |
virtual int Dup(int fd) { return upper_->Dup(fd); } |
| 51 |
|
✗ |
virtual int Readahead(int fd) { return upper_->Readahead(fd); } |
| 52 |
|
|
|
| 53 |
|
3 |
virtual uint32_t SizeOfTxn() |
| 54 |
|
3 |
{ return upper_->SizeOfTxn() + lower_->SizeOfTxn(); } |
| 55 |
|
|
virtual int StartTxn(const shash::Any &id, uint64_t size, void *txn); |
| 56 |
|
|
virtual void CtrlTxn(const Label &label, const int flags, void *txn); |
| 57 |
|
|
virtual int64_t Write(const void *buf, uint64_t size, void *txn); |
| 58 |
|
|
virtual int Reset(void *txn); |
| 59 |
|
✗ |
virtual int OpenFromTxn(void *txn) { return upper_->OpenFromTxn(txn); } |
| 60 |
|
|
virtual int AbortTxn(void *txn); |
| 61 |
|
|
virtual int CommitTxn(void *txn); |
| 62 |
|
|
virtual void Spawn(); |
| 63 |
|
|
|
| 64 |
|
|
virtual manifest::Breadcrumb LoadBreadcrumb(const std::string &fqrn); |
| 65 |
|
|
virtual bool StoreBreadcrumb(const manifest::Manifest &manifest); |
| 66 |
|
|
|
| 67 |
|
|
protected: |
| 68 |
|
|
virtual void *DoSaveState(); |
| 69 |
|
|
virtual int DoRestoreState(void *data); |
| 70 |
|
|
virtual bool DoFreeState(void *data); |
| 71 |
|
|
|
| 72 |
|
|
private: |
| 73 |
|
|
static const unsigned kCopyBufferSize = 64 * 1024; // 64kB |
| 74 |
|
|
|
| 75 |
|
|
struct SavedState { |
| 76 |
|
✗ |
SavedState() : state_upper(NULL), state_lower(NULL) { } |
| 77 |
|
|
void *state_upper; |
| 78 |
|
|
void *state_lower; |
| 79 |
|
|
}; |
| 80 |
|
|
|
| 81 |
|
|
// NOTE: TieredCacheManager takes ownership of both caches passed. |
| 82 |
|
9 |
TieredCacheManager(CacheManager *upper_cache, |
| 83 |
|
|
CacheManager *lower_cache) |
| 84 |
|
9 |
: upper_(upper_cache), lower_(lower_cache), lower_readonly_(false) { } |
| 85 |
|
|
|
| 86 |
|
|
CacheManager *upper_; |
| 87 |
|
|
CacheManager *lower_; |
| 88 |
|
|
bool lower_readonly_; |
| 89 |
|
|
}; // class TieredCacheManager |
| 90 |
|
|
|
| 91 |
|
|
#endif // CVMFS_CACHE_TIERED_H_ |
| 92 |
|
|
|