git.ozlabs.org Git - ccan/blob - ccan/tdb/test/run-open-during-transaction.c

   1 #define _XOPEN_SOURCE 500
   2 #include <unistd.h>
   3 #include "lock-tracking.h"
   4
   5 static ssize_t pwrite_check(int fd, const void *buf, size_t count, off_t offset);
   6 static ssize_t write_check(int fd, const void *buf, size_t count);
   7 static int ftruncate_check(int fd, off_t length);
   8
   9 #define pwrite pwrite_check
  10 #define write write_check
  11 #define fcntl fcntl_with_lockcheck
  12 #define ftruncate ftruncate_check
  13
  14 #include <ccan/tdb/tdb.h>
  15 #include <ccan/tdb/io.c>
  16 #include <ccan/tdb/tdb.c>
  17 #include <ccan/tdb/lock.c>
  18 #include <ccan/tdb/freelist.c>
  19 #include <ccan/tdb/traverse.c>
  20 #include <ccan/tdb/transaction.c>
  21 #include <ccan/tdb/error.c>
  22 #include <ccan/tdb/open.c>
  23 #include <ccan/tdb/check.c>
  24 #include <ccan/tdb/hash.c>
  25 #include <ccan/tap/tap.h>
  26 #include <stdlib.h>
  27 #include <stdbool.h>
  28 #include <stdarg.h>
  29 #include <err.h>
  30 #include "external-agent.h"
  31 #include "logging.h"
  32
  33 static struct agent *agent;
  34 static bool opened;
  35 static int errors = 0;
  36 static bool clear_if_first;
  37 #define TEST_DBNAME "run-open-during-transaction.tdb"
  38
  39 #undef write
  40 #undef pwrite
  41 #undef fcntl
  42 #undef ftruncate
  43
  44 static bool is_same(const char *snapshot, const char *latest, off_t len)
  45 {
  46         unsigned i;
  47
  48         for (i = 0; i < len; i++) {
  49                 if (snapshot[i] != latest[i])
  50                         return false;
  51         }
  52         return true;
  53 }
  54
  55 static bool compare_file(int fd, const char *snapshot, off_t snapshot_len)
  56 {
  57         char *contents;
  58         bool same;
  59
  60         /* over-length read serves as length check. */
  61         contents = malloc(snapshot_len+1);
  62         same = pread(fd, contents, snapshot_len+1, 0) == snapshot_len
  63                 && is_same(snapshot, contents, snapshot_len);
  64         free(contents);
  65         return same;
  66 }
  67
  68 static void check_file_intact(int fd)
  69 {
  70         enum agent_return ret;
  71         struct stat st;
  72         char *contents;
  73
  74         fstat(fd, &st);
  75         contents = malloc(st.st_size);
  76         if (pread(fd, contents, st.st_size, 0) != st.st_size) {
  77                 diag("Read fail");
  78                 errors++;
  79                 return;
  80         }
  81
  82         /* Ask agent to open file. */
  83         ret = external_agent_operation(agent, clear_if_first ?
  84                                        OPEN_WITH_CLEAR_IF_FIRST :
  85                                        OPEN,
  86                                        TEST_DBNAME);
  87
  88         /* It's OK to open it, but it must not have changed! */
  89         if (!compare_file(fd, contents, st.st_size)) {
  90                 diag("Agent changed file after opening %s",
  91                      agent_return_name(ret));
  92                 errors++;
  93         }
  94
  95         if (ret == SUCCESS) {
  96                 ret = external_agent_operation(agent, CLOSE, NULL);
  97                 if (ret != SUCCESS) {
  98                         diag("Agent failed to close tdb: %s",
  99                              agent_return_name(ret));
 100                         errors++;
 101                 }
 102         } else if (ret != WOULD_HAVE_BLOCKED) {
 103                 diag("Agent opening file gave %s",
 104                      agent_return_name(ret));
 105                 errors++;
 106         }
 107
 108         free(contents);
 109 }
 110
 111 static void after_unlock(int fd)
 112 {
 113         if (opened)
 114                 check_file_intact(fd);
 115 }
 116
 117 static ssize_t pwrite_check(int fd,
 118                             const void *buf, size_t count, off_t offset)
 119 {
 120         if (opened)
 121                 check_file_intact(fd);
 122
 123         return pwrite(fd, buf, count, offset);
 124 }
 125
 126 static ssize_t write_check(int fd, const void *buf, size_t count)
 127 {
 128         if (opened)
 129                 check_file_intact(fd);
 130
 131         return write(fd, buf, count);
 132 }
 133
 134 static int ftruncate_check(int fd, off_t length)
 135 {
 136         if (opened)
 137                 check_file_intact(fd);
 138
 139         return ftruncate(fd, length);
 140
 141 }
 142
 143 int main(int argc, char *argv[])
 144 {
 145         const int flags[] = { TDB_DEFAULT,
 146                               TDB_CLEAR_IF_FIRST,
 147                               TDB_NOMMAP,
 148                               TDB_CLEAR_IF_FIRST | TDB_NOMMAP };
 149         int i;
 150         struct tdb_context *tdb;
 151         TDB_DATA key, data;
 152
 153         plan_tests(20);
 154         agent = prepare_external_agent();
 155         if (!agent)
 156                 err(1, "preparing agent");
 157
 158         unlock_callback = after_unlock;
 159         for (i = 0; i < sizeof(flags)/sizeof(flags[0]); i++) {
 160                 clear_if_first = (flags[i] & TDB_CLEAR_IF_FIRST);
 161                 diag("Test with %s and %s\n",
 162                      clear_if_first ? "CLEAR" : "DEFAULT",
 163                      (flags[i] & TDB_NOMMAP) ? "no mmap" : "mmap");
 164                 unlink(TEST_DBNAME);
 165                 tdb = tdb_open_ex(TEST_DBNAME, 1024, flags[i],
 166                                   O_CREAT|O_TRUNC|O_RDWR, 0600,
 167                                   &taplogctx, NULL);
 168                 ok1(tdb);
 169
 170                 opened = true;
 171                 ok1(tdb_transaction_start(tdb) == 0);
 172                 key.dsize = strlen("hi");
 173                 key.dptr = (void *)"hi";
 174                 data.dptr = (void *)"world";
 175                 data.dsize = strlen("world");
 176
 177                 ok1(tdb_store(tdb, key, data, TDB_INSERT) == 0);
 178                 ok1(tdb_transaction_commit(tdb) == 0);
 179                 ok(!errors, "We had %u open errors", errors);
 180
 181                 opened = false;
 182                 tdb_close(tdb);
 183         }
 184
 185         return exit_status();
 186 }