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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#ifndef CVMFS_FD_REFCOUNT_MGR_H_ |
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#define CVMFS_FD_REFCOUNT_MGR_H_ |
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#include <string> |
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#include "cache.h" |
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#include "smallhash.h" |
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// for map of file descriptors; as in kvstore.cc |
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static inline uint32_t hasher_any(const shash::Any &key) { |
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// We'll just do the same thing as hasher_md5, since every hash is at |
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// least as large. |
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return *const_cast<uint32_t *>(reinterpret_cast<const uint32_t *>(key.digest) |
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+ 1); |
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} |
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static inline uint32_t hasher_int(const int &key) { |
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return MurmurHash2(&key, sizeof(key), 0x07387a4f); |
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} |
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class ListOpenHashesMagicXattr; // FD needed to access fd_mgr_ |
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class FdRefcountMgr { |
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friend class ListOpenHashesMagicXattr; |
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public: |
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/** |
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* Helper class containing the values for the map: fd -> refcount+id |
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*/ |
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struct FdRefcountInfo { |
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int refcount; /// refcount for the times the fd was opened in the cache |
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shash::Any id; /// hash of the object opened through the fd |
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FdRefcountInfo() : refcount(-1) { } |
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}; |
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FdRefcountMgr(); |
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~FdRefcountMgr(); |
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FdRefcountMgr(const SmallHashDynamic<int, FdRefcountInfo> &map_refcount, |
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const SmallHashDynamic<shash::Any, int> &map_fd); |
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void AssignFrom(FdRefcountMgr *other); |
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SmallHashDynamic<int, FdRefcountInfo> *GetRefcountMapPtr(); |
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SmallHashDynamic<shash::Any, int> *GetFdMapPtr(); |
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int Open(const shash::Any id, const std::string &path); |
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int Close(int fd); |
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int Dup(int fd); |
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FdRefcountMgr *Clone(); |
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private: |
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/** |
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* map for fd -> refcount lookups. A backreference |
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* to the object id is included in FdRefcountInfo in order |
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* to be able to remove the file descriptor from map_fd_. |
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*/ |
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SmallHashDynamic<int, FdRefcountInfo> map_refcount_; |
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/** |
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* map for object id -> fd lookups, used when |
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* opening files in the cache. The fd is used as key |
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* in the refcount map. |
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*/ |
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SmallHashDynamic<shash::Any, int> map_fd_; |
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pthread_mutex_t *lock_cache_refcount_; |
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}; |
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#endif // CVMFS_FD_REFCOUNT_MGR_H_ |
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