LCOV - code coverage report
Current view: top level - drivers - io-optimize.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 28 0.0 %
Date: 2025-03-10 18:15:27 Functions: 0 8 0.0 %
Branches: 0 47 0.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (c) 2016, Citrix Systems, Inc.
       3                 :            :  *
       4                 :            :  * All rights reserved.
       5                 :            :  *
       6                 :            :  * Redistribution and use in source and binary forms, with or without
       7                 :            :  * modification, are permitted provided that the following conditions are met:
       8                 :            :  * 
       9                 :            :  *  1. Redistributions of source code must retain the above copyright
      10                 :            :  *     notice, this list of conditions and the following disclaimer.
      11                 :            :  *  2. Redistributions in binary form must reproduce the above copyright
      12                 :            :  *     notice, this list of conditions and the following disclaimer in the
      13                 :            :  *     documentation and/or other materials provided with the distribution.
      14                 :            :  *  3. Neither the name of the copyright holder nor the names of its 
      15                 :            :  *     contributors may be used to endorse or promote products derived from 
      16                 :            :  *     this software without specific prior written permission.
      17                 :            :  *
      18                 :            :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      19                 :            :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      20                 :            :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      21                 :            :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
      22                 :            :  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      23                 :            :  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      24                 :            :  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
      25                 :            :  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      26                 :            :  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
      27                 :            :  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
      28                 :            :  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29                 :            :  */
      30                 :            : 
      31                 :            : #ifndef __IO_OPTIMIZE_H__
      32                 :            : #define __IO_OPTIMIZE_H__
      33                 :            : 
      34                 :            : #include "debug.h"
      35                 :            : #include <libaio.h>
      36                 :            : #include <sys/uio.h>
      37                 :            : 
      38                 :            : struct opio;
      39                 :            : 
      40                 :            : struct opio_list {
      41                 :            :         struct opio        *head;
      42                 :            :         struct opio        *tail;
      43                 :            : };
      44                 :            : 
      45                 :            : #define UIO_FASTIOV 8
      46                 :            : 
      47                 :            : struct opio {
      48                 :            :         struct iovec       iov[UIO_FASTIOV];
      49                 :            :         struct iocb        orig_iocb;
      50                 :            :         struct iocb        *iocb;
      51                 :            :         struct io_event     event;
      52                 :            :         struct opio        *head;
      53                 :            :         struct opio        *next;
      54                 :            :         struct opio_list    list;
      55                 :            : };
      56                 :            : 
      57                 :            : struct opioctx {
      58                 :            :         int                 num_opios;
      59                 :            :         int                 free_opio_cnt;
      60                 :            :         struct opio        *opios;
      61                 :            :         struct opio       **free_opios;
      62                 :            :         struct iocb       **iocb_queue;
      63                 :            :         struct io_event    *event_queue;
      64                 :            : };
      65                 :            : 
      66                 :            : int opio_init(struct opioctx *ctx, int num_iocbs);
      67                 :            : void opio_free(struct opioctx *ctx);
      68                 :            : int io_merge(struct opioctx *ctx, struct iocb **queue, int num);
      69                 :            : int io_split(struct opioctx *ctx, struct io_event *events, int num);
      70                 :            : int io_expand_iocbs(struct opioctx *ctx, struct iocb **queue, int idx, int num);
      71                 :            : 
      72                 :            : static inline size_t
      73                 :          0 : iocb_nbytes(const struct iocb* io)
      74                 :            : {
      75   [ #  #  #  #  :          0 :         switch(io->aio_lio_opcode) {
                      # ]
      76                 :            :                 case IO_CMD_PREAD: /* fall-through */
      77                 :            :                 case IO_CMD_PWRITE:
      78                 :          0 :                         return io->u.c.nbytes;
      79                 :            : 
      80                 :            :                 case IO_CMD_FSYNC:
      81                 :            :                 case IO_CMD_FDSYNC: /* fall-through */
      82                 :            :                 case IO_CMD_NOOP: /* fall-through */
      83                 :            :                         return 0;
      84                 :            : 
      85                 :            :                 case IO_CMD_POLL:
      86                 :            :                         /* result is not an amount */
      87                 :          0 :                         ASSERT(0);
      88                 :            : 
      89                 :            :                 case IO_CMD_PREADV: /* fall-through */
      90                 :            :                 case IO_CMD_PWRITEV:
      91                 :            :                         {
      92                 :            :                                 size_t sum = 0, i;
      93         [ #  # ]:          0 :                                 for(i=0; i<io->u.v.nr; i++) {
      94         [ #  # ]:          0 :                                         ASSERT(io->u.v.vec[i].iov_len > 0);
      95                 :          0 :                                         sum += io->u.v.vec[i].iov_len;
      96                 :            :                                 }
      97                 :            :                                 return sum;
      98                 :            :                         }
      99                 :            :                 default:
     100                 :          0 :                         ASSERT(0);
     101                 :            :         }
     102                 :            : }
     103                 :            : 
     104                 :            : static inline long long
     105                 :          0 : iocb_offset(const struct iocb* io)
     106                 :            : {
     107      [ #  #  # ]:          0 :         switch(io->aio_lio_opcode) {
     108                 :            :                 case IO_CMD_PREAD: /* fall-through */
     109                 :            :                 case IO_CMD_PWRITE:
     110                 :          0 :                         return io->u.c.offset;
     111                 :            : 
     112                 :            :                 case IO_CMD_PREADV: /* fall-through */
     113                 :            :                 case IO_CMD_PWRITEV:
     114                 :          0 :                         return io->u.v.offset;
     115                 :            : 
     116                 :            :                 default:
     117                 :            :                         /* no offset in other commands */
     118                 :          0 :                         ASSERT(0);
     119                 :            :         }
     120                 :            : }
     121                 :            : 
     122                 :          0 : static inline void* iocb_buf(const struct iocb *io)
     123                 :            : {
     124         [ #  # ]:          0 :         ASSERT(io->aio_lio_opcode == IO_CMD_PREAD
     125                 :            :                         || io->aio_lio_opcode == IO_CMD_PWRITE);
     126                 :          0 :         return io->u.c.buf;
     127                 :            : }
     128                 :            : 
     129                 :          0 : static inline const char* iocb_opcode(const struct iocb* io)
     130                 :            : {
     131   [ #  #  #  #  :          0 :         switch(io->aio_lio_opcode) {
             #  #  #  #  
                      # ]
     132                 :            :                 case IO_CMD_PREAD:
     133                 :            :                         return "read";
     134                 :            :                 case IO_CMD_PWRITE:
     135                 :          0 :                         return "write";
     136                 :            :                 case IO_CMD_FSYNC:
     137                 :          0 :                         return "fsync";
     138                 :            :                 case IO_CMD_FDSYNC:
     139                 :          0 :                         return "fdsync";
     140                 :            :                 case IO_CMD_POLL:
     141                 :          0 :                         return "poll";
     142                 :            :                 case IO_CMD_NOOP:
     143                 :          0 :                         return "noop";
     144                 :            :                 case IO_CMD_PREADV:
     145                 :          0 :                         return "preadv";
     146                 :            :                 case IO_CMD_PWRITEV:
     147                 :          0 :                         return "pwritev";
     148                 :            :                 default:
     149                 :          0 :                         ASSERT(0);
     150                 :            :         }
     151                 :            : }
     152                 :            : 
     153                 :            : static inline int iocb_vectorized(io_iocb_cmd_t op)
     154                 :            : {
     155      [ #  #  # ]:          0 :         switch (op) {
              [ #  #  # ]
              [ #  #  # ]
              [ #  #  # ]
              [ #  #  # ]
              [ #  #  # ]
              [ #  #  # ]
              [ #  #  # ]
     156                 :            :                 case IO_CMD_PREAD:
     157                 :            :                         return IO_CMD_PREADV;
     158                 :            :                 case IO_CMD_PWRITE:
     159                 :            :                         return IO_CMD_PWRITEV;
     160                 :            :                 default:
     161                 :          0 :                         return op;
     162                 :            :         }
     163                 :            : }
     164                 :            : 
     165                 :            : #endif

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