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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997-2009 Oracle. All rights reserved.
*
* $Id$
*/
#include "db_config.h"
#include "db_int.h"
/*
* __os_io --
* Do an I/O.
*/
int
__os_io(env, op, fhp, pgno, pgsize, relative, io_len, buf, niop)
ENV *env;
int op;
DB_FH *fhp;
db_pgno_t pgno;
u_int32_t pgsize, relative, io_len;
u_int8_t *buf;
size_t *niop;
{
int ret;
#ifndef DB_WINCE
if (__os_is_winnt()) {
DB_ENV *dbenv;
DWORD nbytes;
OVERLAPPED over;
ULONG64 off;
dbenv = env == NULL ? NULL : env->dbenv;
if ((off = relative) == 0)
off = (ULONG64)pgsize * pgno;
over.Offset = (DWORD)(off & 0xffffffff);
over.OffsetHigh = (DWORD)(off >> 32);
over.hEvent = 0; /* we don't want asynchronous notifications */
if (dbenv != NULL &&
FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
__db_msg(env,
"fileops: %s %s: %lu bytes at offset %lu",
op == DB_IO_READ ? "read" : "write",
fhp->name, (u_long)io_len, (u_long)off);
LAST_PANIC_CHECK_BEFORE_IO(env);
switch (op) {
case DB_IO_READ:
#if defined(HAVE_STATISTICS)
++fhp->read_count;
#endif
if (!ReadFile(fhp->handle,
buf, (DWORD)io_len, &nbytes, &over))
goto slow;
break;
case DB_IO_WRITE:
#ifdef HAVE_FILESYSTEM_NOTZERO
if (__os_fs_notzero())
goto slow;
#endif
#if defined(HAVE_STATISTICS)
++fhp->write_count;
#endif
if (!WriteFile(fhp->handle,
buf, (DWORD)io_len, &nbytes, &over))
goto slow;
break;
}
if (nbytes == io_len) {
*niop = (size_t)nbytes;
return (0);
}
}
slow:
#endif
MUTEX_LOCK(env, fhp->mtx_fh);
if ((ret = __os_seek(env, fhp, pgno, pgsize, relative)) != 0)
goto err;
switch (op) {
case DB_IO_READ:
ret = __os_read(env, fhp, buf, io_len, niop);
break;
case DB_IO_WRITE:
ret = __os_write(env, fhp, buf, io_len, niop);
break;
}
err: MUTEX_UNLOCK(env, fhp->mtx_fh);
return (ret);
}
/*
* __os_read --
* Read from a file handle.
*/
int
__os_read(env, fhp, addr, len, nrp)
ENV *env;
DB_FH *fhp;
void *addr;
size_t len;
size_t *nrp;
{
DB_ENV *dbenv;
DWORD count;
size_t offset, nr;
u_int8_t *taddr;
int ret;
dbenv = env == NULL ? NULL : env->dbenv;
ret = 0;
#if defined(HAVE_STATISTICS)
++fhp->read_count;
#endif
if (dbenv != NULL && FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
__db_msg(env,
"fileops: read %s: %lu bytes", fhp->name, (u_long)len);
for (taddr = addr,
offset = 0; offset < len; taddr += nr, offset += nr) {
LAST_PANIC_CHECK_BEFORE_IO(env);
RETRY_CHK((!ReadFile(fhp->handle,
taddr, (DWORD)(len - offset), &count, NULL)), ret);
if (count == 0 || ret != 0)
break;
nr = (size_t)count;
}
*nrp = taddr - (u_int8_t *)addr;
if (ret != 0) {
__db_syserr(env, ret, "read: 0x%lx, %lu",
P_TO_ULONG(taddr), (u_long)len - offset);
ret = __os_posix_err(ret);
}
return (ret);
}
/*
* __os_write --
* Write to a file handle.
*/
int
__os_write(env, fhp, addr, len, nwp)
ENV *env;
DB_FH *fhp;
void *addr;
size_t len;
size_t *nwp;
{
int ret;
#ifdef HAVE_FILESYSTEM_NOTZERO
/* Zero-fill as necessary. */
if (__os_fs_notzero() &&
(ret = __db_zero_fill(env, fhp)) != 0)
return (ret);
#endif
return (__os_physwrite(env, fhp, addr, len, nwp));
}
/*
* __os_physwrite --
* Physical write to a file handle.
*/
int
__os_physwrite(env, fhp, addr, len, nwp)
ENV *env;
DB_FH *fhp;
void *addr;
size_t len;
size_t *nwp;
{
DB_ENV *dbenv;
DWORD count;
size_t offset, nw;
u_int8_t *taddr;
int ret;
dbenv = env == NULL ? NULL : env->dbenv;
ret = 0;
#if defined(HAVE_STATISTICS)
++fhp->write_count;
#endif
if (dbenv != NULL && FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
__db_msg(env,
"fileops: write %s: %lu bytes", fhp->name, (u_long)len);
for (taddr = addr,
offset = 0; offset < len; taddr += nw, offset += nw) {
LAST_PANIC_CHECK_BEFORE_IO(env);
RETRY_CHK((!WriteFile(fhp->handle,
taddr, (DWORD)(len - offset), &count, NULL)), ret);
if (ret != 0)
break;
nw = (size_t)count;
}
*nwp = len;
if (ret != 0) {
__db_syserr(env, ret, "write: %#lx, %lu",
P_TO_ULONG(taddr), (u_long)len - offset);
ret = __os_posix_err(ret);
DB_EVENT(env, DB_EVENT_WRITE_FAILED, NULL);
}
return (ret);
}
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