s3fs-fuse/src/fdcache_entity.h

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/*
* 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 S3FS_FDCACHE_ENTITY_H_
#define S3FS_FDCACHE_ENTITY_H_
#include "autolock.h"
#include "fdcache_page.h"
#include "fdcache_fdinfo.h"
#include "metaheader.h"
//------------------------------------------------
// class FdEntity
//------------------------------------------------
class FdEntity
{
private:
static bool mixmultipart; // whether multipart uploading can use copy api.
pthread_mutex_t fdent_lock;
bool is_lock_init;
std::string path; // object path
int physical_fd; // physical file(cache or temporary file) descriptor
fdinfo_map_t pseudo_fd_map; // pseudo file descriptor information map
FILE* pfile; // file pointer(tmp file or cache file)
ino_t inode; // inode number for 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 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
bool is_meta_pending;
struct timespec holding_mtime; // if mtime is updated while the file is open, it is set time_t value
private:
static int FillFile(int fd, unsigned char byte, off_t size, off_t start);
static ino_t GetInode(int fd);
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void Clear();
ino_t GetInode();
int OpenMirrorFile();
int NoCacheLoadAndPost(PseudoFdInfo* pseudo_obj, off_t start = 0, off_t size = 0); // size=0 means loading to end
PseudoFdInfo* CheckPseudoFdFlags(int fd, bool writable, bool lock_already_held = false);
bool IsUploading(bool lock_already_held = false);
bool SetAllStatus(bool is_loaded); // [NOTE] not locking
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bool SetAllStatusUnloaded() { return SetAllStatus(false); }
int NoCachePreMultipartPost(PseudoFdInfo* pseudo_obj);
int NoCacheMultipartPost(PseudoFdInfo* pseudo_obj, int tgfd, off_t start, off_t size);
int NoCacheCompleteMultipartPost(PseudoFdInfo* pseudo_obj);
int RowFlushNoMultipart(PseudoFdInfo* pseudo_obj, const char* tpath);
int RowFlushMultipart(PseudoFdInfo* pseudo_obj, const char* tpath);
int RowFlushMixMultipart(PseudoFdInfo* pseudo_obj, const char* tpath);
ssize_t WriteNoMultipart(PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
ssize_t WriteMultipart(PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
ssize_t WriteMixMultipart(PseudoFdInfo* pseudo_obj, const char* bytes, off_t start, size_t size);
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int UploadPendingMeta();
public:
static bool GetNoMixMultipart() { return mixmultipart; }
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static bool SetNoMixMultipart();
explicit FdEntity(const char* tpath = NULL, const char* cpath = NULL);
~FdEntity();
void Close(int fd);
bool IsOpen() const { return (-1 != physical_fd); }
bool FindPseudoFd(int fd, bool lock_already_held = false);
int Open(const headers_t* pmeta, off_t size, time_t time, int flags, AutoLock::Type type);
bool LoadAll(int fd, headers_t* pmeta = NULL, off_t* size = NULL, bool force_load = false);
int Dup(int fd, bool lock_already_held = false);
int OpenPseudoFd(int flags = O_RDONLY, bool lock_already_held = false);
int GetOpenCount(bool lock_already_held = false);
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const char* GetPath() const { return path.c_str(); }
bool RenamePath(const std::string& newpath, std::string& fentmapkey);
int GetPhysicalFd() const { return physical_fd; }
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bool IsModified() const;
bool MergeOrgMeta(headers_t& updatemeta);
bool GetStats(struct stat& st, bool lock_already_held = false);
int SetCtime(struct timespec time, bool lock_already_held = false);
int SetAtime(struct timespec time, bool lock_already_held = false);
int SetMCtime(struct timespec mtime, struct timespec ctime, bool lock_already_held = false);
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bool UpdateCtime();
bool UpdateAtime();
bool UpdateMtime(bool clear_holding_mtime = false);
bool UpdateMCtime();
bool SetHoldingMtime(struct timespec mtime, bool lock_already_held = false);
bool ClearHoldingMtime(bool lock_already_held = false);
bool GetSize(off_t& size);
bool GetXattr(std::string& xattr);
bool SetXattr(const std::string& xattr);
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, off_t size, AutoLock::Type type, bool is_modified_flag = false); // size=0 means loading to end
off_t BytesModified();
int RowFlush(int fd, const char* tpath, bool force_sync = false);
int Flush(int fd, bool force_sync = false) { return RowFlush(fd, NULL, force_sync); }
ssize_t Read(int fd, char* bytes, off_t start, size_t size, bool force_load = false);
ssize_t Write(int fd, const char* bytes, off_t start, size_t size);
bool ReserveDiskSpace(off_t size);
bool PunchHole(off_t start = 0, size_t size = 0);
void MarkDirtyNewFile();
};
typedef std::map<std::string, class FdEntity*> fdent_map_t; // key=path, value=FdEntity*
#endif // S3FS_FDCACHE_ENTITY_H_
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: expandtab sw=4 ts=4 fdm=marker
* vim<600: expandtab sw=4 ts=4
*/