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Tweak I/O, fix last commit.

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This commit is contained in:
Hallvard Furuseth 2013-06-26 18:02:17 +02:00
parent d6d2638acc
commit 26a25df5fc
1 changed files with 18 additions and 10 deletions
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28
libraries/liblmdb/mdb.c
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@ -995,6 +995,9 @@ typedef struct MDB_ntxn {
#define MDB_COMMIT_PAGES IOV_MAX
#endif
/* max bytes to write in one call */
#define MAX_WRITE (0x80000000U >> (sizeof(ssize_t) == 4))
static int mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp);
static int mdb_page_new(MDB_cursor *mc, uint32_t flags, int num, MDB_page **mp);
static int mdb_page_touch(MDB_cursor *mc);
@ -2260,23 +2263,27 @@ mdb_page_flush(MDB_txn *txn)
}
#else
/* Write up to MDB_COMMIT_PAGES dirty pages at a time. */
if (pos != next_pos || n == MDB_COMMIT_PAGES) {
if (pos!=next_pos || n==MDB_COMMIT_PAGES || wsize+size>MAX_WRITE) {
if (n) {
/* Write previous page(s) */
#ifdef HAVE_PWRITEV
#ifdef MDB_USE_PWRITEV
wres = pwritev(env->me_fd, iov, n, wpos);
#else
if (lseek(env->me_fd, wpos, SEEK_SET) < 0) {
rc = ErrCode();
DPRINTF("lseek: %s", strerror(rc));
return rc;
if (n == 1) {
wres = pwrite(env->me_fd, iov[0].iov_base, wsize, wpos);
} else {
if (lseek(env->me_fd, wpos, SEEK_SET) < 0) {
rc = ErrCode();
DPRINTF("lseek: %s", strerror(rc));
return rc;
}
wres = writev(env->me_fd, iov, n);
}
wres = writev(env->me_fd, iov, n);
#endif
if (wres != wsize) {
if (wres < 0) {
rc = ErrCode();
DPRINTF("writev: %s", strerror(rc));
DPRINTF("Write error: %s", strerror(rc));
} else {
rc = EIO; /* TODO: Use which error code? */
DPUTS("short write, filesystem full?");
@ -2685,6 +2692,8 @@ mdb_env_write_meta(MDB_txn *txn)
meta.mm_last_pg = metab.mm_last_pg;
meta.mm_txnid = metab.mm_txnid;
#ifdef _WIN32
memset(&ov, 0, sizeof(ov));
ov.Offset = off;
WriteFile(env->me_fd, ptr, len, NULL, &ov);
#else
r2 = pwrite(env->me_fd, ptr, len, off);
@ -3615,7 +3624,6 @@ mdb_env_copyfd(MDB_env *env, HANDLE fd)
ptr = env->me_map + wsize;
wsize = txn->mt_next_pgno * env->me_psize - wsize;
#define MAX_WRITE 2147483648U
#ifdef _WIN32
while (wsize > 0) {
DWORD len, w2;
@ -3638,7 +3646,7 @@ mdb_env_copyfd(MDB_env *env, HANDLE fd)
else
w2 = wsize;
wres = write(fd, ptr, w2);
rc = wres == (ssize_t)w2 ? MDB_SUCCESS : rc < 0 ? ErrCode() : EIO;
rc = wres == (ssize_t)w2 ? MDB_SUCCESS : wres < 0 ? ErrCode() : EIO;
if (rc) break;
wsize -= wres;
ptr += wres;