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

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