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32 lines
879 B
C++
32 lines
879 B
C++
#pragma once
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#include <string>
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#include <memory>
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namespace DB
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{
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class IDisk;
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using DiskPtr = std::shared_ptr<IDisk>;
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/// Helper class, that receives file descriptor and does fsync for it in destructor.
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/// It's used to keep descriptor open, while doing some operations with it, and do fsync at the end.
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/// Guaranties of sequence 'close-reopen-fsync' may depend on kernel version.
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/// Source: linux-fsdevel mailing-list https://marc.info/?l=linux-fsdevel&m=152535409207496
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class DirectorySyncGuard
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{
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public:
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/// NOTE: If you have already opened descriptor, it's preferred to use
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/// this constructor instead of constructor with path.
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DirectorySyncGuard(const DiskPtr & disk_, int fd_) : disk(disk_), fd(fd_) {}
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DirectorySyncGuard(const DiskPtr & disk_, const std::string & path);
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~DirectorySyncGuard();
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private:
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DiskPtr disk;
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int fd = -1;
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};
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}
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