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git.ipfire.org Git - thirdparty/squid.git/blob - src/fs/ufs/UFSStoreState.h
2 * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
9 #ifndef SQUID_FS_UFS_UFSSTORESTATE_H
10 #define SQUID_FS_UFS_UFSSTORESTATE_H
12 #include "DiskIO/IORequestor.h"
13 #include "StoreIOState.h"
22 class UFSStoreState
: public StoreIOState
, public IORequestor
24 CBDATA_CLASS(UFSStoreState
);
27 UFSStoreState(SwapDir
* SD
, StoreEntry
* anEntry
, STIOCB
* callback_
, void *callback_data_
);
29 virtual void close(int how
);
30 virtual void closeCompleted();
32 virtual void ioCompletedNotification();
33 virtual void readCompleted(const char *buf
, int len
, int errflag
, RefCount
<ReadRequest
>);
34 virtual void writeCompleted(int errflag
, size_t len
, RefCount
<WriteRequest
>);
35 RefCount
<DiskFile
> theFile
;
41 /* StoreIOState API */
42 void read_(char *buf
, size_t size
, off_t offset
, STRCB
* callback
, void *callback_data
);
43 virtual bool write(char const *buf
, size_t size
, off_t offset
, FREE
* free_func
);
46 virtual void doCloseCallback (int errflag
);
50 MEMPROXY_CLASS(UFSStoreState::_queued_read
);
52 _queued_read(char *b
, size_t s
, off_t o
, STRCB
*cb
, void *data
) :
57 callback_data(cbdataReference(data
))
60 cbdataReferenceDone(callback_data
);
62 _queued_read(const _queued_read
&qr
) = delete;
63 _queued_read
&operator =(const _queued_read
&qr
) = delete;
71 std::queue
<Ufs::UFSStoreState::_queued_read
> pending_reads
;
75 MEMPROXY_CLASS(UFSStoreState::_queued_write
);
77 _queued_write(const char *b
, size_t s
, off_t o
, FREE
*f
) :
86 * Note "free_func" is memNodeWriteComplete(), which doesn't
87 * really free the memory. Instead it clears the node's
91 free_func(const_cast<char *>(buf
));
93 _queued_write(const _queued_write
&qr
) = delete;
94 _queued_write
&operator =(const _queued_write
&qr
) = delete;
101 std::queue
<Ufs::UFSStoreState::_queued_write
> pending_writes
;
103 /** \todo These should be in the IO strategy */
108 * the write_draining flag is used to avoid recursion inside
109 * the UFSStoreState::drainWriteQueue() method.
114 * The try_closing flag is set by UFSStoreState::tryClosing()
115 * when UFSStoreState wants to close the file, but cannot
116 * because of pending I/Os. If set, UFSStoreState will
117 * try to close again in the I/O callbacks.
122 bool kickReadQueue();
123 void drainWriteQueue();
136 #endif /* SQUID_FS_UFS_UFSSTORESTATE_H */