lib/tdb/test/run-open-during-transaction.c

   1 #include "../common/tdb_private.h"
   2 #include "lock-tracking.h"
   3
   4 static ssize_t pwrite_check(int fd, const void *buf, size_t count, off_t offset);
   5 static ssize_t write_check(int fd, const void *buf, size_t count);
   6 static int ftruncate_check(int fd, off_t length);
   7
   8 #define pwrite pwrite_check
   9 #define write write_check
  10 #define fcntl fcntl_with_lockcheck
  11 #define ftruncate ftruncate_check
  12
  13 #include "../common/io.c"
  14 #include "../common/tdb.c"
  15 #include "../common/lock.c"
  16 #include "../common/freelist.c"
  17 #include "../common/traverse.c"
  18 #include "../common/transaction.c"
  19 #include "../common/error.c"
  20 #include "../common/open.c"
  21 #include "../common/check.c"
  22 #include "../common/hash.c"
  23 #include "tap-interface.h"
  24 #include <stdlib.h>
  25 #include <stdbool.h>
  26 #include <stdarg.h>
  27 #include <err.h>
  28 #include "external-agent.h"
  29 #include "logging.h"
  30
  31 static struct agent *agent;
  32 static bool opened;
  33 static int errors = 0;
  34 static bool clear_if_first;
  35 #define TEST_DBNAME "run-open-during-transaction.tdb"
  36
  37 #undef write
  38 #undef pwrite
  39 #undef fcntl
  40 #undef ftruncate
  41
  42 static bool is_same(const char *snapshot, const char *latest, off_t len)
  43 {
  44         unsigned i;
  45
  46         for (i = 0; i < len; i++) {
  47                 if (snapshot[i] != latest[i])
  48                         return false;
  49         }
  50         return true;
  51 }
  52
  53 static bool compare_file(int fd, const char *snapshot, off_t snapshot_len)
  54 {
  55         char *contents;
  56         bool same;
  57
  58         /* over-length read serves as length check. */
  59         contents = malloc(snapshot_len+1);
  60         same = pread(fd, contents, snapshot_len+1, 0) == snapshot_len
  61                 && is_same(snapshot, contents, snapshot_len);
  62         free(contents);
  63         return same;
  64 }
  65
  66 static void check_file_intact(int fd)
  67 {
  68         enum agent_return ret;
  69         struct stat st;
  70         char *contents;
  71
  72         fstat(fd, &st);
  73         contents = malloc(st.st_size);
  74         if (pread(fd, contents, st.st_size, 0) != st.st_size) {
  75                 diag("Read fail");
  76                 errors++;
  77                 return;
  78         }
  79
  80         /* Ask agent to open file. */
  81         ret = external_agent_operation(agent, clear_if_first ?
  82                                        OPEN_WITH_CLEAR_IF_FIRST :
  83                                        OPEN,
  84                                        TEST_DBNAME);
  85
  86         /* It's OK to open it, but it must not have changed! */
  87         if (!compare_file(fd, contents, st.st_size)) {
  88                 diag("Agent changed file after opening %s",
  89                      agent_return_name(ret));
  90                 errors++;
  91         }
  92
  93         if (ret == SUCCESS) {
  94                 ret = external_agent_operation(agent, CLOSE, NULL);
  95                 if (ret != SUCCESS) {
  96                         diag("Agent failed to close tdb: %s",
  97                              agent_return_name(ret));
  98                         errors++;
  99                 }
 100         } else if (ret != WOULD_HAVE_BLOCKED) {
 101                 diag("Agent opening file gave %s",
 102                      agent_return_name(ret));
 103                 errors++;
 104         }
 105
 106         free(contents);
 107 }
 108
 109 static void after_unlock(int fd)
 110 {
 111         if (opened)
 112                 check_file_intact(fd);
 113 }
 114
 115 static ssize_t pwrite_check(int fd,
 116                             const void *buf, size_t count, off_t offset)
 117 {
 118         if (opened)
 119                 check_file_intact(fd);
 120
 121         return pwrite(fd, buf, count, offset);
 122 }
 123
 124 static ssize_t write_check(int fd, const void *buf, size_t count)
 125 {
 126         if (opened)
 127                 check_file_intact(fd);
 128
 129         return write(fd, buf, count);
 130 }
 131
 132 static int ftruncate_check(int fd, off_t length)
 133 {
 134         if (opened)
 135                 check_file_intact(fd);
 136
 137         return ftruncate(fd, length);
 138
 139 }
 140
 141 int main(int argc, char *argv[])
 142 {
 143         const int flags[] = { TDB_DEFAULT,
 144                               TDB_CLEAR_IF_FIRST,
 145                               TDB_NOMMAP,
 146                               TDB_CLEAR_IF_FIRST | TDB_NOMMAP };
 147         int i;
 148         struct tdb_context *tdb;
 149         TDB_DATA key, data;
 150
 151         plan_tests(20);
 152         agent = prepare_external_agent();
 153         if (!agent)
 154                 err(1, "preparing agent");
 155
 156         unlock_callback = after_unlock;
 157         for (i = 0; i < sizeof(flags)/sizeof(flags[0]); i++) {
 158                 clear_if_first = (flags[i] & TDB_CLEAR_IF_FIRST);
 159                 diag("Test with %s and %s\n",
 160                      clear_if_first ? "CLEAR" : "DEFAULT",
 161                      (flags[i] & TDB_NOMMAP) ? "no mmap" : "mmap");
 162                 unlink(TEST_DBNAME);
 163                 tdb = tdb_open_ex(TEST_DBNAME, 1024, flags[i],
 164                                   O_CREAT|O_TRUNC|O_RDWR, 0600,
 165                                   &taplogctx, NULL);
 166                 ok1(tdb);
 167
 168                 opened = true;
 169                 ok1(tdb_transaction_start(tdb) == 0);
 170                 key.dsize = strlen("hi");
 171                 key.dptr = (void *)"hi";
 172                 data.dptr = (void *)"world";
 173                 data.dsize = strlen("world");
 174
 175                 ok1(tdb_store(tdb, key, data, TDB_INSERT) == 0);
 176                 ok1(tdb_transaction_commit(tdb) == 0);
 177                 ok(!errors, "We had %u open errors", errors);
 178
 179                 opened = false;
 180                 tdb_close(tdb);
 181         }
 182
 183         return exit_status();
 184 }