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ITS#7453 Fix reset of MDB_NOSYNC/MDB_NOMETASYNC.

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mdb_env_open() with these flags did not open a synchronizing
file descriptor.  Thus disabling them later did not work.
This commit is contained in:
Hallvard Furuseth 2012-11-27 23:56:47 +01:00
parent 0201b9002c
commit 6b56e0fab1
1 changed files with 9 additions and 4 deletions
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13
libraries/libmdb/mdb.c
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@ -2423,6 +2423,7 @@ mdb_env_write_meta(MDB_txn *txn)
off_t off;
int rc, len, toggle;
char *ptr;
HANDLE mfd;
#ifdef _WIN32
OVERLAPPED ov;
#endif
@ -2481,14 +2482,16 @@ mdb_env_write_meta(MDB_txn *txn)
off += PAGEHDRSZ;
/* Write to the SYNC fd */
mfd = env->me_flags & (MDB_NOSYNC|MDB_NOMETASYNC) ?
env->me_fd : env->me_mfd;
#ifdef _WIN32
{
memset(&ov, 0, sizeof(ov));
ov.Offset = off;
WriteFile(env->me_mfd, ptr, len, (DWORD *)&rc, &ov);
WriteFile(mfd, ptr, len, (DWORD *)&rc, &ov);
}
#else
rc = pwrite(env->me_mfd, ptr, len, off);
rc = pwrite(mfd, ptr, len, off);
#endif
if (rc != len) {
int r2;
@ -3221,10 +3224,12 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
}
if ((rc = mdb_env_open2(env)) == MDB_SUCCESS) {
if (flags & (MDB_RDONLY|MDB_NOSYNC|MDB_NOMETASYNC|MDB_WRITEMAP)) {
if (flags & (MDB_RDONLY|MDB_WRITEMAP)) {
env->me_mfd = env->me_fd;
} else {
/* synchronous fd for meta writes */
/* Synchronous fd for meta writes. Needed even with
* MDB_NOSYNC/MDB_NOMETASYNC, in case these get reset.
*/
#ifdef _WIN32
env->me_mfd = CreateFile(dpath, oflags,
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, len,