LCOV - code coverage report
Current view: top level - drivers - tapdisk-driver.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 2 67 3.0 %
Date: 2025-04-18 11:59:49 Functions: 1 8 12.5 %
Branches: 1 26 3.8 %

           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                 :            : #ifdef HAVE_CONFIG_H
      32                 :            : #include "config.h"
      33                 :            : #endif
      34                 :            : 
      35                 :            : #include <stdlib.h>
      36                 :            : #include <stdio.h>
      37                 :            : 
      38                 :            : #include "tapdisk-driver.h"
      39                 :            : #include "tapdisk-server.h"
      40                 :            : #include "tapdisk-disktype.h"
      41                 :            : #include "tapdisk-stats.h"
      42                 :            : 
      43                 :            : static void
      44                 :          0 : tapdisk_driver_log_flush(td_driver_t *driver, const char *__caller)
      45                 :            : {
      46                 :          0 :         td_loglimit_t *rl = &driver->loglimit;
      47                 :            : 
      48         [ #  # ]:          0 :         if (rl->dropped) {
      49                 :          0 :                 tlog_syslog(TLOG_WARN,
      50                 :            :                             "%s: %s: %d messages suppressed",
      51                 :            :                             driver->name, __caller, rl->dropped);
      52                 :          0 :                 rl->dropped = 0;
      53                 :            :         }
      54                 :          0 : }
      55                 :            : 
      56                 :            : int
      57                 :          0 : tapdisk_driver_log_pass(td_driver_t *driver, const char *__caller)
      58                 :            : {
      59                 :          0 :         td_loglimit_t *rl = &driver->loglimit;
      60                 :          0 :         int dropping = rl->dropped;
      61                 :            : 
      62         [ #  # ]:          0 :         if (tapdisk_loglimit_pass(rl)) {
      63                 :          0 :                 tapdisk_driver_log_flush(driver, __caller);
      64                 :          0 :                 return 1;
      65                 :            :         }
      66                 :            : 
      67         [ #  # ]:          0 :         if (!dropping)
      68                 :          0 :                 tlog_syslog(TLOG_WARN,
      69                 :            :                             "%s: %s: too many errors, dropped.",
      70                 :            :                             driver->name, __caller);
      71                 :            : 
      72                 :            :         return 0;
      73                 :            : }
      74                 :            : 
      75                 :            : td_driver_t *
      76                 :          0 : tapdisk_driver_allocate(int type, const char *name, td_flag_t flags)
      77                 :            : {
      78                 :            :         int err;
      79                 :            :         td_driver_t *driver;
      80                 :            :         const struct tap_disk *ops;
      81                 :            : 
      82                 :          0 :         ops = tapdisk_disk_drivers[type];
      83         [ #  # ]:          0 :         if (!ops)
      84                 :            :                 return NULL;
      85                 :            : 
      86                 :          0 :         driver = calloc(1, sizeof(td_driver_t));
      87         [ #  # ]:          0 :         if (!driver)
      88                 :            :                 return NULL;
      89                 :            : 
      90                 :          0 :         err = tapdisk_namedup(&driver->name, name);
      91         [ #  # ]:          0 :         if (err)
      92                 :            :                 goto fail;
      93                 :            : 
      94                 :          0 :         driver->ops     = ops;
      95                 :          0 :         driver->type    = type;
      96                 :          0 :         driver->storage = -1;
      97                 :          0 :         driver->data    = calloc(1, ops->private_data_size);
      98         [ #  # ]:          0 :         if (!driver->data)
      99                 :            :                 goto fail;
     100                 :            : 
     101         [ #  # ]:          0 :         if (td_flag_test(flags, TD_OPEN_RDONLY)){
     102                 :          0 :                 td_flag_set(driver->state, TD_DRIVER_RDONLY);
     103                 :          0 :                 driver->prep_func = tapdisk_server_prep_tiocb_ro;
     104                 :          0 :                 driver->queue_func = tapdisk_server_queue_tiocb_ro;
     105                 :            :         } else {
     106                 :          0 :                 driver->prep_func = tapdisk_server_prep_tiocb;
     107                 :          0 :                 driver->queue_func = tapdisk_server_queue_tiocb;
     108                 :            :         }
     109                 :            : 
     110                 :          0 :         tapdisk_loglimit_init(&driver->loglimit,
     111                 :            :                               16 /* msgs */,
     112                 :            :                               90 * 1000 /* ms */);
     113                 :            : 
     114                 :          0 :         return driver;
     115                 :            : 
     116                 :            : fail:
     117                 :          0 :         free(driver->name);
     118                 :          0 :         free(driver->data);
     119                 :          0 :         free(driver);
     120                 :          0 :         return NULL;
     121                 :            : }
     122                 :            : 
     123                 :            : void
     124                 :          2 : tapdisk_driver_free(td_driver_t *driver)
     125                 :            : {
     126         [ -  + ]:          2 :         if (!driver)
     127                 :            :                 return;
     128                 :            : 
     129         [ #  # ]:          0 :         if (driver->refcnt)
     130                 :            :                 return;
     131                 :            : 
     132         [ #  # ]:          0 :         if (td_flag_test(driver->state, TD_DRIVER_OPEN))
     133                 :          0 :                 EPRINTF("freeing open driver %s (state 0x%08x)\n",
     134                 :            :                         driver->name, driver->state);
     135                 :            : 
     136                 :          0 :         tapdisk_driver_log_flush(driver, __func__);
     137                 :            : 
     138                 :          0 :         free(driver->name);
     139                 :          0 :         free(driver->data);
     140                 :          0 :         free(driver);
     141                 :            : }
     142                 :            : 
     143                 :            : void
     144                 :          0 : tapdisk_driver_prep_tiocb(td_driver_t *driver, struct tiocb *tiocb, int fd, int rw, char *buf, size_t size,
     145                 :            :                    long long offset, td_queue_callback_t cb, void *arg)
     146                 :            : {
     147                 :          0 :         driver->prep_func(tiocb, fd, rw, buf, size, offset, cb, arg);
     148                 :          0 : }
     149                 :            : 
     150                 :            : void
     151                 :          0 : tapdisk_driver_queue_tiocb(td_driver_t *driver, struct tiocb *tiocb)
     152                 :            : {
     153                 :          0 :         driver->queue_func(tiocb);
     154                 :          0 : }
     155                 :            : 
     156                 :            : void
     157                 :          0 : tapdisk_driver_debug(td_driver_t *driver)
     158                 :            : {
     159         [ #  # ]:          0 :         if (driver->ops->td_debug)
     160                 :          0 :                 driver->ops->td_debug(driver);
     161                 :          0 : }
     162                 :            : 
     163                 :            : void
     164                 :          0 : tapdisk_driver_stats(td_driver_t *driver, td_stats_t *st)
     165                 :            : {
     166                 :            :         const disk_info_t *info;
     167                 :            : 
     168                 :          0 :         tapdisk_stats_field(st, "type", "d", driver->type);
     169                 :            : 
     170                 :          0 :         info = tapdisk_disk_types[driver->type];
     171                 :          0 :         tapdisk_stats_field(st, "name", "s", info->name);
     172                 :            : 
     173         [ #  # ]:          0 :         if (driver->ops->td_stats) {
     174                 :          0 :                 tapdisk_stats_field(st, "status", "{");
     175                 :          0 :                 driver->ops->td_stats(driver, st);
     176                 :          0 :                 tapdisk_stats_leave(st, '}');
     177                 :            :         } else
     178                 :          0 :                 tapdisk_stats_field(st, "status", NULL);
     179                 :            : 
     180                 :          0 : }

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