src/fs/rock/RockSwapDir.h

   1 #ifndef SQUID_FS_ROCK_SWAP_DIR_H
   2 #define SQUID_FS_ROCK_SWAP_DIR_H
   3
   4 #include "DiskIO/DiskFile.h"
   5 #include "DiskIO/IORequestor.h"
   6 #include "fs/rock/RockDbCell.h"
   7 #include "fs/rock/RockForward.h"
   8 #include "ipc/mem/Page.h"
   9 #include "ipc/mem/PageStack.h"
  10 #include "ipc/StoreMap.h"
  11 #include "SwapDir.h"
  12
  13 class DiskIOStrategy;
  14 class ReadRequest;
  15 class WriteRequest;
  16
  17 namespace Rock
  18 {
  19
  20 /// \ingroup Rock
  21 class SwapDir: public ::SwapDir, public IORequestor, public Ipc::StoreMapCleaner
  22 {
  23 public:
  24     typedef RefCount<SwapDir> Pointer;
  25     typedef Ipc::StoreMap DirMap;
  26
  27     SwapDir();
  28     virtual ~SwapDir();
  29
  30     /* public ::SwapDir API */
  31     virtual void reconfigure();
  32     virtual StoreSearch *search(String const url, HttpRequest *);
  33     virtual StoreEntry *get(const cache_key *key);
  34     virtual void get(String const, STOREGETCLIENT, void * cbdata);
  35     virtual void markForUnlink(StoreEntry &e);
  36     virtual void disconnect(StoreEntry &e);
  37     virtual uint64_t currentSize() const;
  38     virtual uint64_t currentCount() const;
  39     virtual bool doReportStat() const;
  40     virtual void swappedOut(const StoreEntry &e);
  41     virtual void create();
  42     virtual void parse(int index, char *path);
  43
  44     // temporary path to the shared memory map of first slots of cached entries
  45     const char *inodeMapPath() const;
  46     // temporary path to the shared memory stack of free slots
  47     const char *freeSlotsPath() const;
  48
  49     int64_t entryLimitHigh() const { return SwapFilenMax; } ///< Core limit
  50     int64_t entryLimitAllowed() const;
  51
  52     /// removes a slot from a list of free slots or returns false
  53     bool useFreeSlot(Ipc::Mem::PageId &pageId);
  54     /// whether the given slot ID may point to a slot in this db
  55     bool validSlotId(const SlotId slotId) const;
  56     /// purges one or more entries to make full() false and free some slots
  57     void purgeSome();
  58
  59     int64_t diskOffset(Ipc::Mem::PageId &pageId) const;
  60     int64_t diskOffset(int filen) const;
  61     void writeError(StoreEntry &e);
  62
  63     /* StoreMapCleaner API */
  64     virtual void noteFreeMapSlice(const sfileno fileno);
  65
  66     uint64_t slotSize; ///< all db slots are of this size
  67
  68 protected:
  69     /* Store API */
  70     virtual bool anchorCollapsed(StoreEntry &collapsed, bool &inSync);
  71     virtual bool updateCollapsed(StoreEntry &collapsed);
  72
  73     /* protected ::SwapDir API */
  74     virtual bool needsDiskStrand() const;
  75     virtual void init();
  76     virtual ConfigOption *getOptionTree() const;
  77     virtual bool allowOptionReconfigure(const char *const option) const;
  78     virtual bool canStore(const StoreEntry &e, int64_t diskSpaceNeeded, int &load) const;
  79     virtual StoreIOState::Pointer createStoreIO(StoreEntry &, StoreIOState::STFNCB *, StoreIOState::STIOCB *, void *);
  80     virtual StoreIOState::Pointer openStoreIO(StoreEntry &, StoreIOState::STFNCB *, StoreIOState::STIOCB *, void *);
  81     virtual void maintain();
  82     virtual void diskFull();
  83     virtual void reference(StoreEntry &e);
  84     virtual bool dereference(StoreEntry &e, bool);
  85     virtual bool unlinkdUseful() const;
  86     virtual void unlink(StoreEntry &e);
  87     virtual void statfs(StoreEntry &e) const;
  88
  89     /* IORequestor API */
  90     virtual void ioCompletedNotification();
  91     virtual void closeCompleted();
  92     virtual void readCompleted(const char *buf, int len, int errflag, RefCount< ::ReadRequest>);
  93     virtual void writeCompleted(int errflag, size_t len, RefCount< ::WriteRequest>);
  94
  95     void parseSize(const bool reconfiguring); ///< parses anonymous cache_dir size option
  96     void validateOptions(); ///< warns of configuration problems; may quit
  97     bool parseTimeOption(char const *option, const char *value, int reconfiguring);
  98     void dumpTimeOption(StoreEntry * e) const;
  99     bool parseRateOption(char const *option, const char *value, int reconfiguring);
 100     void dumpRateOption(StoreEntry * e) const;
 101     bool parseSizeOption(char const *option, const char *value, int reconfiguring);
 102     void dumpSizeOption(StoreEntry * e) const;
 103
 104     void rebuild(); ///< starts loading and validating stored entry metadata
 105
 106     bool full() const; ///< no more entries can be stored without purging
 107     void trackReferences(StoreEntry &e); ///< add to replacement policy scope
 108     void ignoreReferences(StoreEntry &e); ///< delete from repl policy scope
 109
 110     int64_t diskOffsetLimit() const;
 111     int entryLimit() const { return map->entryLimit(); }
 112     int entryMaxPayloadSize() const;
 113     int entriesNeeded(const int64_t objSize) const;
 114
 115     void anchorEntry(StoreEntry &e, const sfileno filen, const Ipc::StoreMapAnchor &anchor);
 116     bool updateCollapsedWith(StoreEntry &collapsed, const Ipc::StoreMapAnchor &anchor);
 117
 118     friend class Rebuild;
 119     friend class IoState;
 120     const char *filePath; ///< location of cache storage file inside path/
 121     DirMap *map; ///< entry key/sfileno to MaxExtras/inode mapping
 122
 123 private:
 124     void createError(const char *const msg);
 125
 126     DiskIOStrategy *io;
 127     RefCount<DiskFile> theFile; ///< cache storage for this cache_dir
 128     Ipc::Mem::Pointer<Ipc::Mem::PageStack> freeSlots; ///< all unused slots
 129     Ipc::Mem::PageId *waitingForPage; ///< one-page cache for a "hot" free slot
 130
 131     /* configurable options */
 132     DiskFile::Config fileConfig; ///< file-level configuration options
 133
 134     static const int64_t HeaderSize; ///< on-disk db header size
 135 };
 136
 137 /// initializes shared memory segments used by Rock::SwapDir
 138 class SwapDirRr: public Ipc::Mem::RegisteredRunner
 139 {
 140 public:
 141     /* ::RegisteredRunner API */
 142     virtual ~SwapDirRr();
 143
 144 protected:
 145     /* Ipc::Mem::RegisteredRunner API */
 146     virtual void create();
 147
 148 private:
 149     std::vector<SwapDir::DirMap::Owner *> mapOwners;
 150     std::vector< Ipc::Mem::Owner<Ipc::Mem::PageStack> *> freeSlotsOwners;
 151 };
 152
 153 } // namespace Rock
 154
 155 #endif /* SQUID_FS_ROCK_SWAP_DIR_H */