lib/tdb2/test/run-56-open-during-transaction.c

   1 #include <ccan/tdb2/private.h>
   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 "tdb2-source.h"
  15 #include <ccan/tap/tap.h>
  16 #include <stdlib.h>
  17 #include <stdbool.h>
  18 #include <stdarg.h>
  19 #include <err.h>
  20 #include "external-agent.h"
  21 #include "logging.h"
  22
  23 static struct agent *agent;
  24 static bool opened;
  25 static int errors = 0;
  26 #define TEST_DBNAME "run-56-open-during-transaction.tdb"
  27
  28 #undef write
  29 #undef pwrite
  30 #undef fcntl
  31 #undef ftruncate
  32
  33 static bool is_same(const char *snapshot, const char *latest, off_t len)
  34 {
  35         unsigned i;
  36
  37         for (i = 0; i < len; i++) {
  38                 if (snapshot[i] != latest[i])
  39                         return false;
  40         }
  41         return true;
  42 }
  43
  44 static bool compare_file(int fd, const char *snapshot, off_t snapshot_len)
  45 {
  46         char *contents;
  47         bool same;
  48
  49         /* over-length read serves as length check. */
  50         contents = malloc(snapshot_len+1);
  51         same = pread(fd, contents, snapshot_len+1, 0) == snapshot_len
  52                 && is_same(snapshot, contents, snapshot_len);
  53         free(contents);
  54         return same;
  55 }
  56
  57 static void check_file_intact(int fd)
  58 {
  59         enum agent_return ret;
  60         struct stat st;
  61         char *contents;
  62
  63         fstat(fd, &st);
  64         contents = malloc(st.st_size);
  65         if (pread(fd, contents, st.st_size, 0) != st.st_size) {
  66                 diag("Read fail");
  67                 errors++;
  68                 return;
  69         }
  70
  71         /* Ask agent to open file. */
  72         ret = external_agent_operation(agent, OPEN, TEST_DBNAME);
  73
  74         /* It's OK to open it, but it must not have changed! */
  75         if (!compare_file(fd, contents, st.st_size)) {
  76                 diag("Agent changed file after opening %s",
  77                      agent_return_name(ret));
  78                 errors++;
  79         }
  80
  81         if (ret == SUCCESS) {
  82                 ret = external_agent_operation(agent, CLOSE, NULL);
  83                 if (ret != SUCCESS) {
  84                         diag("Agent failed to close tdb: %s",
  85                              agent_return_name(ret));
  86                         errors++;
  87                 }
  88         } else if (ret != WOULD_HAVE_BLOCKED) {
  89                 diag("Agent opening file gave %s",
  90                      agent_return_name(ret));
  91                 errors++;
  92         }
  93
  94         free(contents);
  95 }
  96
  97 static void after_unlock(int fd)
  98 {
  99         if (opened)
 100                 check_file_intact(fd);
 101 }
 102
 103 static ssize_t pwrite_check(int fd,
 104                             const void *buf, size_t count, off_t offset)
 105 {
 106         if (opened)
 107                 check_file_intact(fd);
 108
 109         return pwrite(fd, buf, count, offset);
 110 }
 111
 112 static ssize_t write_check(int fd, const void *buf, size_t count)
 113 {
 114         if (opened)
 115                 check_file_intact(fd);
 116
 117         return write(fd, buf, count);
 118 }
 119
 120 static int ftruncate_check(int fd, off_t length)
 121 {
 122         if (opened)
 123                 check_file_intact(fd);
 124
 125         return ftruncate(fd, length);
 126
 127 }
 128
 129 int main(int argc, char *argv[])
 130 {
 131         const int flags[] = { TDB_DEFAULT, TDB_NOMMAP,
 132                         TDB_CONVERT, TDB_NOMMAP|TDB_CONVERT,
 133                         TDB_VERSION1, TDB_NOMMAP|TDB_VERSION1,
 134                         TDB_CONVERT|TDB_VERSION1,
 135                         TDB_NOMMAP|TDB_CONVERT|TDB_VERSION1 };
 136         int i;
 137         struct tdb_context *tdb;
 138         TDB_DATA key, data;
 139
 140         plan_tests(sizeof(flags)/sizeof(flags[0]) * 5);
 141         agent = prepare_external_agent();
 142         if (!agent)
 143                 err(1, "preparing agent");
 144
 145         unlock_callback = after_unlock;
 146         for (i = 0; i < sizeof(flags)/sizeof(flags[0]); i++) {
 147                 diag("Test with %s and %s\n",
 148                      (flags[i] & TDB_CONVERT) ? "CONVERT" : "DEFAULT",
 149                      (flags[i] & TDB_NOMMAP) ? "no mmap" : "mmap");
 150                 unlink(TEST_DBNAME);
 151                 tdb = tdb_open(TEST_DBNAME, flags[i],
 152                                O_RDWR|O_CREAT|O_TRUNC, 0600, &tap_log_attr);
 153                 ok1(tdb);
 154
 155                 opened = true;
 156                 ok1(tdb_transaction_start(tdb) == 0);
 157                 key = tdb_mkdata("hi", strlen("hi"));
 158                 data = tdb_mkdata("world", strlen("world"));
 159
 160                 ok1(tdb_store(tdb, key, data, TDB_INSERT) == 0);
 161                 ok1(tdb_transaction_commit(tdb) == 0);
 162                 ok(!errors, "We had %u open errors", errors);
 163
 164                 opened = false;
 165                 tdb_close(tdb);
 166         }
 167
 168         return exit_status();
 169 }