179 lines
8.4 KiB
C++
179 lines
8.4 KiB
C++
/*
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* s3fs - FUSE-based file system backed by Amazon S3
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*
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* Copyright(C) 2007 Randy Rizun <rrizun@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef S3FS_FDCACHE_ENTITY_H_
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#define S3FS_FDCACHE_ENTITY_H_
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#include <fcntl.h>
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#include <memory>
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#include "autolock.h"
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#include "fdcache_page.h"
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#include "fdcache_fdinfo.h"
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#include "fdcache_untreated.h"
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#include "metaheader.h"
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//------------------------------------------------
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// class FdEntity
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//------------------------------------------------
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class FdEntity
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{
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private:
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// [NOTE]
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// Distinguish between meta pending and new file creation pending,
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// because the processing(request) at these updates is different.
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// Therefore, the pending state is expressed by this enum type.
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//
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enum class pending_status_t {
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NO_UPDATE_PENDING = 0,
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UPDATE_META_PENDING, // pending meta header
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CREATE_FILE_PENDING // pending file creation and meta header
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};
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static bool mixmultipart; // whether multipart uploading can use copy api.
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static bool streamupload; // whether stream uploading.
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mutable pthread_mutex_t fdent_lock;
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bool is_lock_init;
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std::string path; // object path
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int physical_fd; // physical file(cache or temporary file) descriptor
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UntreatedParts untreated_list; // list of untreated parts that have been written and not yet uploaded(for streamupload)
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fdinfo_map_t pseudo_fd_map; // pseudo file descriptor information map
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FILE* pfile; // file pointer(tmp file or cache file)
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ino_t inode; // inode number for cache file
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headers_t orgmeta; // original headers at opening
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off_t size_orgmeta; // original file size in original headers
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mutable pthread_mutex_t fdent_data_lock;// protects the following members
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PageList pagelist;
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std::string cachepath; // local cache file path
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// (if this is empty, does not load/save pagelist.)
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std::string mirrorpath; // mirror file path to local cache file path
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pending_status_t pending_status;// status for new file creation and meta update
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struct timespec holding_mtime; // if mtime is updated while the file is open, it is set time_t value
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private:
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static int FillFile(int fd, unsigned char byte, off_t size, off_t start);
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static ino_t GetInode(int fd);
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void Clear();
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ino_t GetInode() const;
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int OpenMirrorFile();
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int NoCacheLoadAndPost(PseudoFdInfo* pseudo_obj, off_t start = 0, off_t size = 0); // size=0 means loading to end
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PseudoFdInfo* CheckPseudoFdFlags(int fd, bool writable, AutoLock::Type locktype = AutoLock::NONE);
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bool IsUploading(AutoLock::Type locktype = AutoLock::NONE);
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bool SetAllStatus(bool is_loaded); // [NOTE] not locking
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bool SetAllStatusUnloaded() { return SetAllStatus(false); }
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int NoCachePreMultipartPost(PseudoFdInfo* pseudo_obj);
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int NoCacheMultipartPost(PseudoFdInfo* pseudo_obj, int tgfd, off_t start, off_t size);
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int NoCacheCompleteMultipartPost(PseudoFdInfo* pseudo_obj);
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int RowFlushNoMultipart(const PseudoFdInfo* pseudo_obj, const char* tpath);
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int RowFlushMultipart(PseudoFdInfo* pseudo_obj, const char* tpath);
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int RowFlushMixMultipart(PseudoFdInfo* pseudo_obj, const char* tpath);
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int RowFlushStreamMultipart(PseudoFdInfo* pseudo_obj, const char* tpath);
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ssize_t WriteNoMultipart(const PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
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ssize_t WriteMultipart(PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
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ssize_t WriteMixMultipart(PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
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ssize_t WriteStreamUpload(PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
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bool ReserveDiskSpace(off_t size);
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bool AddUntreated(off_t start, off_t size);
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bool IsDirtyMetadata() const;
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public:
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static bool GetNoMixMultipart() { return mixmultipart; }
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static bool SetNoMixMultipart();
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static bool GetStreamUpload() { return streamupload; }
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static bool SetStreamUpload(bool isstream);
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explicit FdEntity(const char* tpath = nullptr, const char* cpath = nullptr);
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~FdEntity();
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FdEntity(const FdEntity&) = delete;
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FdEntity(FdEntity&&) = delete;
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FdEntity& operator=(const FdEntity&) = delete;
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FdEntity& operator=(FdEntity&&) = delete;
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void Close(int fd);
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bool IsOpen() const { return (-1 != physical_fd); }
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bool FindPseudoFd(int fd, AutoLock::Type locktype = AutoLock::NONE) const;
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int Open(const headers_t* pmeta, off_t size, const struct timespec& ts_mctime, int flags, AutoLock::Type type);
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bool LoadAll(int fd, headers_t* pmeta = nullptr, off_t* size = nullptr, bool force_load = false);
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int Dup(int fd, AutoLock::Type locktype = AutoLock::NONE);
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int OpenPseudoFd(int flags = O_RDONLY, AutoLock::Type locktype = AutoLock::NONE);
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int GetOpenCount(AutoLock::Type locktype = AutoLock::NONE) const;
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const std::string& GetPath() const { return path; }
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bool RenamePath(const std::string& newpath, std::string& fentmapkey);
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int GetPhysicalFd() const { return physical_fd; }
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bool IsModified() const;
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bool MergeOrgMeta(headers_t& updatemeta);
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int UploadPending(int fd, AutoLock::Type type);
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bool GetStats(struct stat& st, AutoLock::Type locktype = AutoLock::NONE) const;
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int SetCtime(struct timespec time, AutoLock::Type locktype = AutoLock::NONE);
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int SetAtime(struct timespec time, AutoLock::Type locktype = AutoLock::NONE);
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int SetMCtime(struct timespec mtime, struct timespec ctime, AutoLock::Type locktype = AutoLock::NONE);
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bool UpdateCtime();
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bool UpdateAtime();
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bool UpdateMtime(bool clear_holding_mtime = false);
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bool UpdateMCtime();
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bool SetHoldingMtime(struct timespec mtime, AutoLock::Type locktype = AutoLock::NONE);
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bool ClearHoldingMtime(AutoLock::Type locktype = AutoLock::NONE);
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bool GetSize(off_t& size) const;
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bool GetXattr(std::string& xattr) const;
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bool SetXattr(const std::string& xattr);
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bool SetMode(mode_t mode);
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bool SetUId(uid_t uid);
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bool SetGId(gid_t gid);
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bool SetContentType(const char* path);
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int Load(off_t start, off_t size, AutoLock::Type type, bool is_modified_flag = false); // size=0 means loading to end
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off_t BytesModified();
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int RowFlush(int fd, const char* tpath, AutoLock::Type type, bool force_sync = false);
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int Flush(int fd, AutoLock::Type type, bool force_sync = false) { return RowFlush(fd, nullptr, type, force_sync); }
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ssize_t Read(int fd, char* bytes, off_t start, size_t size, bool force_load = false);
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ssize_t Write(int fd, const char* bytes, off_t start, size_t size);
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bool PunchHole(off_t start = 0, size_t size = 0);
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void MarkDirtyNewFile();
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bool IsDirtyNewFile() const;
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void MarkDirtyMetadata();
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bool GetLastUpdateUntreatedPart(off_t& start, off_t& size) const;
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bool ReplaceLastUpdateUntreatedPart(off_t front_start, off_t front_size, off_t behind_start, off_t behind_size);
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};
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typedef std::map<std::string, std::unique_ptr<FdEntity>> fdent_map_t; // key=path, value=FdEntity*
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#endif // S3FS_FDCACHE_ENTITY_H_
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: expandtab sw=4 ts=4 fdm=marker
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* vim<600: expandtab sw=4 ts=4
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*/
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