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Code Editor : fdcache.h
/* * s3fs - FUSE-based file system backed by Amazon S3 * * Copyright(C) 2007 Randy Rizun <rrizun@gmail.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef FD_CACHE_H_ #define FD_CACHE_H_ #include <sys/statvfs.h> #include "curl.h" //------------------------------------------------ // CacheFileStat //------------------------------------------------ class CacheFileStat { private: std::string path; int fd; private: static bool MakeCacheFileStatPath(const char* path, std::string& sfile_path, bool is_create_dir = true); public: static bool DeleteCacheFileStat(const char* path); static bool CheckCacheFileStatTopDir(void); static bool DeleteCacheFileStatDirectory(void); static bool RenameCacheFileStat(const char* oldpath, const char* newpath); explicit CacheFileStat(const char* tpath = NULL); ~CacheFileStat(); bool Open(void); bool Release(void); bool SetPath(const char* tpath, bool is_open = true); int GetFd(void) const { return fd; } }; //------------------------------------------------ // fdpage & PageList //------------------------------------------------ // page block information struct fdpage { off_t offset; off_t bytes; bool loaded; bool modified; fdpage(off_t start = 0, off_t size = 0, bool is_loaded = false, bool is_modified = false) : offset(start), bytes(size), loaded(is_loaded), modified(is_modified) {} off_t next(void) const { return (offset + bytes); } off_t end(void) const { return (0 < bytes ? offset + bytes - 1 : 0); } }; typedef std::list<struct fdpage> fdpage_list_t; class FdEntity; // // Management of loading area/modifying // // cppcheck-suppress copyCtorAndEqOperator class PageList { friend class FdEntity; // only one method access directly pages. private: fdpage_list_t pages; public: enum page_status{ PAGE_NOT_LOAD_MODIFIED = 0, PAGE_LOADED, PAGE_MODIFIED, PAGE_LOAD_MODIFIED }; private: void Clear(void); bool Compress(bool force_modified = false); bool Parse(off_t new_pos); bool RawGetUnloadPageList(fdpage_list_t& dlpages, off_t offset, off_t size); public: static void FreeList(fdpage_list_t& list); explicit PageList(off_t size = 0, bool is_loaded = false, bool is_modified = false); explicit PageList(const PageList& other); ~PageList(); bool Init(off_t size, bool is_loaded, bool is_modified); off_t Size(void) const; bool Resize(off_t size, bool is_loaded, bool is_modified); bool IsPageLoaded(off_t start = 0, off_t size = 0) const; // size=0 is checking to end of list bool SetPageLoadedStatus(off_t start, off_t size, PageList::page_status pstatus = PAGE_LOADED, bool is_compress = true); bool FindUnloadedPage(off_t start, off_t& resstart, off_t& ressize) const; off_t GetTotalUnloadedPageSize(off_t start = 0, off_t size = 0) const; // size=0 is checking to end of list int GetUnloadedPages(fdpage_list_t& unloaded_list, off_t start = 0, off_t size = 0) const; // size=0 is checking to end of list bool GetLoadPageListForMultipartUpload(fdpage_list_t& dlpages); bool GetMultipartSizeList(fdpage_list_t& mplist, off_t partsize) const; bool IsModified(void) const; bool ClearAllModified(void); bool Serialize(CacheFileStat& file, bool is_output); void Dump(void); }; //------------------------------------------------ // class FdEntity //------------------------------------------------ class FdEntity { private: static bool mixmultipart; // whether multipart uploading can use copy api. pthread_mutex_t fdent_lock; bool is_lock_init; int refcnt; // reference count std::string path; // object path int fd; // file descriptor(tmp file or cache file) FILE* pfile; // file pointer(tmp file or cache file) headers_t orgmeta; // original headers at opening off_t size_orgmeta; // original file size in original headers pthread_mutex_t fdent_data_lock;// protects the following members PageList pagelist; std::string upload_id; // for no cached multipart uploading when no disk space etaglist_t etaglist; // for no cached multipart uploading when no disk space off_t mp_start; // start position for no cached multipart(write method only) off_t mp_size; // size for no cached multipart(write method only) std::string cachepath; // local cache file path // (if this is empty, does not load/save pagelist.) std::string mirrorpath; // mirror file path to local cache file path private: static int FillFile(int fd, unsigned char byte, off_t size, off_t start); void Clear(void); int OpenMirrorFile(void); bool SetAllStatus(bool is_loaded); // [NOTE] not locking //bool SetAllStatusLoaded(void) { return SetAllStatus(true); } bool SetAllStatusUnloaded(void) { return SetAllStatus(false); } public: static bool SetNoMixMultipart(void); explicit FdEntity(const char* tpath = NULL, const char* cpath = NULL); ~FdEntity(); void Close(void); bool IsOpen(void) const { return (-1 != fd); } int Open(headers_t* pmeta = NULL, off_t size = -1, time_t time = -1, bool no_fd_lock_wait = false); bool OpenAndLoadAll(headers_t* pmeta = NULL, off_t* size = NULL, bool force_load = false); int Dup(bool lock_already_held = false); const char* GetPath(void) const { return path.c_str(); } bool RenamePath(const std::string& newpath, std::string& fentmapkey); int GetFd(void) const { return fd; } bool IsModified(void) const { return pagelist.IsModified(); } bool GetStats(struct stat& st, bool lock_already_held = false); int SetCtime(time_t time); int SetMtime(time_t time, bool lock_already_held = false); bool UpdateCtime(void); bool UpdateMtime(void); bool GetSize(off_t& size); bool SetMode(mode_t mode); bool SetUId(uid_t uid); bool SetGId(gid_t gid); bool SetContentType(const char* path); int Load(off_t start = 0, off_t size = 0, bool lock_already_held = false); // size=0 means loading to end int NoCacheLoadAndPost(off_t start = 0, off_t size = 0); // size=0 means loading to end int NoCachePreMultipartPost(void); int NoCacheMultipartPost(int tgfd, off_t start, off_t size); int NoCacheCompleteMultipartPost(void); int RowFlush(const char* tpath, bool force_sync = false); int Flush(bool force_sync = false) { return RowFlush(NULL, force_sync); } ssize_t Read(char* bytes, off_t start, size_t size, bool force_load = false); ssize_t Write(const char* bytes, off_t start, size_t size); bool ReserveDiskSpace(off_t size); }; typedef std::map<std::string, class FdEntity*> fdent_map_t; // key=path, value=FdEntity* //------------------------------------------------ // class FdManager //------------------------------------------------ class FdManager { private: static FdManager singleton; static pthread_mutex_t fd_manager_lock; static pthread_mutex_t cache_cleanup_lock; static pthread_mutex_t reserved_diskspace_lock; static bool is_lock_init; static std::string cache_dir; static bool check_cache_dir_exist; static off_t free_disk_space; // limit free disk space fdent_map_t fent; private: static off_t GetFreeDiskSpace(const char* path); void CleanupCacheDirInternal(const std::string &path = ""); public: FdManager(); ~FdManager(); // Reference singleton static FdManager* get(void) { return &singleton; } static bool DeleteCacheDirectory(void); static int DeleteCacheFile(const char* path); static bool SetCacheDir(const char* dir); static bool IsCacheDir(void) { return (0 < FdManager::cache_dir.size()); } static const char* GetCacheDir(void) { return FdManager::cache_dir.c_str(); } static bool MakeCachePath(const char* path, std::string& cache_path, bool is_create_dir = true, bool is_mirror_path = false); static bool CheckCacheTopDir(void); static bool MakeRandomTempPath(const char* path, std::string& tmppath); static bool SetCheckCacheDirExist(bool is_check); static bool CheckCacheDirExist(void); static off_t GetEnsureFreeDiskSpace(); static off_t SetEnsureFreeDiskSpace(off_t size); static bool IsSafeDiskSpace(const char* path, off_t size); static void FreeReservedDiskSpace(off_t size); static bool ReserveDiskSpace(off_t size); // Return FdEntity associated with path, returning NULL on error. This operation increments the reference count; callers must decrement via Close after use. FdEntity* GetFdEntity(const char* path, int existfd = -1); FdEntity* Open(const char* path, headers_t* pmeta = NULL, off_t size = -1, time_t time = -1, bool force_tmpfile = false, bool is_create = true, bool no_fd_lock_wait = false); FdEntity* ExistOpen(const char* path, int existfd = -1, bool ignore_existfd = false); void Rename(const std::string &from, const std::string &to); bool Close(FdEntity* ent); bool ChangeEntityToTempPath(FdEntity* ent, const char* path); void CleanupCacheDir(); }; #endif // FD_CACHE_H_ /* * Local variables: * tab-width: 4 * c-basic-offset: 4 * End: * vim600: noet sw=4 ts=4 fdm=marker * vim<600: noet sw=4 ts=4 */
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