137 lines
4.7 KiB
C++
137 lines
4.7 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_PAGE_H_
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#define S3FS_FDCACHE_PAGE_H_
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#include <sys/types.h>
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#include <vector>
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//------------------------------------------------
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// Symbols
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//------------------------------------------------
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// [NOTE]
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// If the following symbols in lseek whence are undefined, define them.
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// If it is not supported by lseek, s3fs judges by the processing result of lseek.
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//
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#ifndef SEEK_DATA
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#define SEEK_DATA 3
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#endif
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#ifndef SEEK_HOLE
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#define SEEK_HOLE 4
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#endif
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//------------------------------------------------
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// Structure fdpage
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//------------------------------------------------
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// page block information
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struct fdpage
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{
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off_t offset;
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off_t bytes;
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bool loaded;
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bool modified;
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explicit fdpage(off_t start = 0, off_t size = 0, bool is_loaded = false, bool is_modified = false) :
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offset(start), bytes(size), loaded(is_loaded), modified(is_modified) {}
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off_t next() const
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{
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return (offset + bytes);
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}
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off_t end() const
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{
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return (0 < bytes ? offset + bytes - 1 : 0);
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}
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};
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typedef std::vector<struct fdpage> fdpage_list_t;
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//------------------------------------------------
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// Class PageList
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//------------------------------------------------
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class CacheFileStat;
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class FdEntity;
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// cppcheck-suppress copyCtorAndEqOperator
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class PageList
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{
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friend class FdEntity; // only one method access directly pages.
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private:
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fdpage_list_t pages;
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bool is_shrink; // [NOTE] true if it has been shrinked even once
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public:
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enum class page_status{
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NOT_LOAD_MODIFIED = 0,
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LOADED,
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MODIFIED,
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LOAD_MODIFIED
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};
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private:
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static bool GetSparseFilePages(int fd, size_t file_size, fdpage_list_t& sparse_list);
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static bool CheckZeroAreaInFile(int fd, off_t start, size_t bytes);
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static bool CheckAreaInSparseFile(const struct fdpage& checkpage, const fdpage_list_t& sparse_list, int fd, fdpage_list_t& err_area_list, fdpage_list_t& warn_area_list);
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void Clear();
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bool Parse(off_t new_pos);
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public:
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static void FreeList(fdpage_list_t& list);
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explicit PageList(off_t size = 0, bool is_loaded = false, bool is_modified = false, bool shrinked = false);
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PageList(const PageList&) = delete;
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PageList& operator=(const PageList&) = delete;
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~PageList();
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bool Init(off_t size, bool is_loaded, bool is_modified);
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off_t Size() const;
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bool Resize(off_t size, bool is_loaded, bool is_modified);
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bool IsPageLoaded(off_t start = 0, off_t size = 0) const; // size=0 is checking to end of list
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bool SetPageLoadedStatus(off_t start, off_t size, PageList::page_status pstatus = page_status::LOADED, bool is_compress = true);
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bool FindUnloadedPage(off_t start, off_t& resstart, off_t& ressize) const;
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off_t GetTotalUnloadedPageSize(off_t start = 0, off_t size = 0, off_t limit_size = 0) const; // size=0 is checking to end of list
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size_t GetUnloadedPages(fdpage_list_t& unloaded_list, off_t start = 0, off_t size = 0) const; // size=0 is checking to end of list
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bool GetPageListsForMultipartUpload(fdpage_list_t& dlpages, fdpage_list_t& mixuppages, off_t max_partsize);
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bool GetNoDataPageLists(fdpage_list_t& nodata_pages, off_t start = 0, size_t size = 0);
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off_t BytesModified() const;
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bool IsModified() const;
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bool ClearAllModified();
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bool Compress();
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bool Serialize(CacheFileStat& file, bool is_output, ino_t inode);
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void Dump() const;
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bool CompareSparseFile(int fd, size_t file_size, fdpage_list_t& err_area_list, fdpage_list_t& warn_area_list);
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};
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#endif // S3FS_FDCACHE_PAGE_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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