Commit 8de0788b authored by Hallvard Furuseth's avatar Hallvard Furuseth
Browse files

Only set me_mfd if needed. Drop unused read access.

parent e911ad64
......@@ -1239,7 +1239,7 @@ typedef struct MDB_pgstate {
struct MDB_env {
HANDLE me_fd; /**< The main data file */
HANDLE me_lfd; /**< The lock file */
HANDLE me_mfd; /**< just for writing the meta pages */
HANDLE me_mfd; /**< For writing and syncing the meta pages */
/** Failed to update the meta page. Probably an I/O error. */
#define MDB_FATAL_ERROR 0x80000000U
/** Some fields are initialized. */
......@@ -3827,7 +3827,10 @@ mdb_env_write_meta(MDB_txn *txn)
len = sizeof(MDB_meta) - off;
off += (char *)mp - env->me_map;
/* Write to the SYNC fd */
/* Write to the SYNC fd unless MDB_NOSYNC/MDB_NOMETASYNC.
* (me_mfd goes to the same file as me_fd, but writing to it
* also syncs to disk. Avoids a separate fdatasync() call.)
*/
mfd = (flags & (MDB_NOSYNC|MDB_NOMETASYNC)) ? env->me_fd : env->me_mfd;
#ifdef _WIN32
{
......@@ -4156,7 +4159,7 @@ enum mdb_fopen_type {
/* A comment in mdb_fopen() explains some O_* flag choices. */
MDB_O_RDONLY= O_RDONLY, /**< for RDONLY me_fd */
MDB_O_RDWR = O_RDWR |O_CREAT, /**< for me_fd */
MDB_O_META = O_RDWR |MDB_DSYNC |MDB_CLOEXEC, /**< for me_mfd */
MDB_O_META = O_WRONLY|MDB_DSYNC |MDB_CLOEXEC, /**< for me_mfd */
MDB_O_COPY = O_WRONLY|O_CREAT|O_EXCL|MDB_CLOEXEC, /**< for #mdb_env_copy() */
/** Bitmask for open() flags in enum #mdb_fopen_type. The other bits
* distinguish otherwise-equal MDB_O_* constants from each other.
......@@ -4217,6 +4220,7 @@ mdb_fopen(const MDB_env *env, MDB_name *fname,
disp = OPEN_EXISTING;
break;
case MDB_O_META: /* for writing metapages */
acc = GENERIC_WRITE;
disp = OPEN_EXISTING;
attrs = FILE_ATTRIBUTE_NORMAL|FILE_FLAG_WRITE_THROUGH;
break;
......@@ -4955,9 +4959,7 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode
}
if ((rc = mdb_env_open2(env)) == MDB_SUCCESS) {
if (flags & (MDB_RDONLY|MDB_WRITEMAP)) {
env->me_mfd = env->me_fd;
} else {
if (!(flags & (MDB_RDONLY|MDB_WRITEMAP))) {
/* Synchronous fd for meta writes. Needed even with
* MDB_NOSYNC/MDB_NOMETASYNC, in case these get reset.
*/
......@@ -5040,7 +5042,7 @@ mdb_env_close0(MDB_env *env, int excl)
if (env->me_map) {
munmap(env->me_map, env->me_mapsize);
}
if (env->me_mfd != env->me_fd && env->me_mfd != INVALID_HANDLE_VALUE)
if (env->me_mfd != INVALID_HANDLE_VALUE)
(void) close(env->me_mfd);
if (env->me_fd != INVALID_HANDLE_VALUE)
(void) close(env->me_fd);
......
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