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samba-mirror/source3/smbd/aio.c
Jeremy Allison 30191d1a57 RIP BOOL. Convert BOOL -> bool. I found a few interesting
bugs in various places whilst doing this (places that assumed
BOOL == int). I also need to fix the Samba4 pidl generation
(next checkin).
Jeremy.
(This used to be commit f35a266b3c)
2007-10-18 17:40:25 -07:00

790 lines
22 KiB
C

/*
Unix SMB/Netbios implementation.
Version 3.0
async_io read handling using POSIX async io.
Copyright (C) Jeremy Allison 2005.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#if defined(WITH_AIO)
/* The signal we'll use to signify aio done. */
#ifndef RT_SIGNAL_AIO
#define RT_SIGNAL_AIO (SIGRTMIN+3)
#endif
/****************************************************************************
The buffer we keep around whilst an aio request is in process.
*****************************************************************************/
struct aio_extra {
struct aio_extra *next, *prev;
SMB_STRUCT_AIOCB acb;
files_struct *fsp;
bool read_req;
uint16 mid;
char *inbuf;
char *outbuf;
};
static struct aio_extra *aio_list_head;
/****************************************************************************
Create the extended aio struct we must keep around for the lifetime
of the aio_read call.
*****************************************************************************/
static struct aio_extra *create_aio_ex_read(files_struct *fsp, size_t buflen,
uint16 mid)
{
struct aio_extra *aio_ex = SMB_MALLOC_P(struct aio_extra);
if (!aio_ex) {
return NULL;
}
ZERO_STRUCTP(aio_ex);
/* The output buffer stored in the aio_ex is the start of
the smb return buffer. The buffer used in the acb
is the start of the reply data portion of that buffer. */
aio_ex->outbuf = SMB_MALLOC_ARRAY(char, buflen);
if (!aio_ex->outbuf) {
SAFE_FREE(aio_ex);
return NULL;
}
DLIST_ADD(aio_list_head, aio_ex);
aio_ex->fsp = fsp;
aio_ex->read_req = True;
aio_ex->mid = mid;
return aio_ex;
}
/****************************************************************************
Create the extended aio struct we must keep around for the lifetime
of the aio_write call.
*****************************************************************************/
static struct aio_extra *create_aio_ex_write(files_struct *fsp,
size_t inbuflen,
size_t outbuflen,
uint16 mid)
{
struct aio_extra *aio_ex = SMB_MALLOC_P(struct aio_extra);
if (!aio_ex) {
return NULL;
}
ZERO_STRUCTP(aio_ex);
/* We need space for an output reply of outbuflen bytes. */
aio_ex->outbuf = SMB_MALLOC_ARRAY(char, outbuflen);
if (!aio_ex->outbuf) {
SAFE_FREE(aio_ex);
return NULL;
}
if (!(aio_ex->inbuf = SMB_MALLOC_ARRAY(char, inbuflen))) {
SAFE_FREE(aio_ex->outbuf);
SAFE_FREE(aio_ex);
return NULL;
}
DLIST_ADD(aio_list_head, aio_ex);
aio_ex->fsp = fsp;
aio_ex->read_req = False;
aio_ex->mid = mid;
return aio_ex;
}
/****************************************************************************
Delete the extended aio struct.
*****************************************************************************/
static void delete_aio_ex(struct aio_extra *aio_ex)
{
DLIST_REMOVE(aio_list_head, aio_ex);
SAFE_FREE(aio_ex->inbuf);
SAFE_FREE(aio_ex->outbuf);
SAFE_FREE(aio_ex);
}
/****************************************************************************
Given the aiocb struct find the extended aio struct containing it.
*****************************************************************************/
static struct aio_extra *find_aio_ex(uint16 mid)
{
struct aio_extra *p;
for( p = aio_list_head; p; p = p->next) {
if (mid == p->mid) {
return p;
}
}
return NULL;
}
/****************************************************************************
We can have these many aio buffers in flight.
*****************************************************************************/
#define AIO_PENDING_SIZE 10
static sig_atomic_t signals_received;
static int outstanding_aio_calls;
static uint16 aio_pending_array[AIO_PENDING_SIZE];
/****************************************************************************
Signal handler when an aio request completes.
*****************************************************************************/
static void signal_handler(int sig, siginfo_t *info, void *unused)
{
if (signals_received < AIO_PENDING_SIZE) {
aio_pending_array[signals_received] = info->si_value.sival_int;
signals_received++;
} /* Else signal is lost. */
sys_select_signal(RT_SIGNAL_AIO);
}
/****************************************************************************
Is there a signal waiting ?
*****************************************************************************/
bool aio_finished(void)
{
return (signals_received != 0);
}
/****************************************************************************
Initialize the signal handler for aio read/write.
*****************************************************************************/
void initialize_async_io_handler(void)
{
struct sigaction act;
ZERO_STRUCT(act);
act.sa_sigaction = signal_handler;
act.sa_flags = SA_SIGINFO;
sigemptyset( &act.sa_mask );
if (sigaction(RT_SIGNAL_AIO, &act, NULL) != 0) {
DEBUG(0,("Failed to setup RT_SIGNAL_AIO handler\n"));
}
/* the signal can start off blocked due to a bug in bash */
BlockSignals(False, RT_SIGNAL_AIO);
}
/****************************************************************************
Set up an aio request from a SMBreadX call.
*****************************************************************************/
bool schedule_aio_read_and_X(connection_struct *conn,
struct smb_request *req,
files_struct *fsp, SMB_OFF_T startpos,
size_t smb_maxcnt)
{
struct aio_extra *aio_ex;
SMB_STRUCT_AIOCB *a;
size_t bufsize;
size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
if (!min_aio_read_size || (smb_maxcnt < min_aio_read_size)) {
/* Too small a read for aio request. */
DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
"for minimum aio_read of %u\n",
(unsigned int)smb_maxcnt,
(unsigned int)min_aio_read_size ));
return False;
}
/* Only do this on non-chained and non-chaining reads not using the
* write cache. */
if (chain_size !=0 || (CVAL(req->inbuf,smb_vwv0) != 0xFF)
|| (lp_write_cache_size(SNUM(conn)) != 0) ) {
return False;
}
if (outstanding_aio_calls >= AIO_PENDING_SIZE) {
DEBUG(10,("schedule_aio_read_and_X: Already have %d aio "
"activities outstanding.\n",
outstanding_aio_calls ));
return False;
}
/* The following is safe from integer wrap as we've already checked
smb_maxcnt is 128k or less. Wct is 12 for read replies */
bufsize = smb_size + 12 * 2 + smb_maxcnt;
if ((aio_ex = create_aio_ex_read(fsp, bufsize, req->mid)) == NULL) {
DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
return False;
}
construct_reply_common((char *)req->inbuf, aio_ex->outbuf);
set_message(aio_ex->outbuf, 12, 0, True);
SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
a = &aio_ex->acb;
/* Now set up the aio record for the read call. */
a->aio_fildes = fsp->fh->fd;
a->aio_buf = smb_buf(aio_ex->outbuf);
a->aio_nbytes = smb_maxcnt;
a->aio_offset = startpos;
a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
a->aio_sigevent.sigev_value.sival_int = aio_ex->mid;
if (SMB_VFS_AIO_READ(fsp,a) == -1) {
DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
"Error %s\n", strerror(errno) ));
delete_aio_ex(aio_ex);
return False;
}
DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
"offset %.0f, len = %u (mid = %u)\n",
fsp->fsp_name, (double)startpos, (unsigned int)smb_maxcnt,
(unsigned int)aio_ex->mid ));
srv_defer_sign_response(aio_ex->mid);
outstanding_aio_calls++;
return True;
}
/****************************************************************************
Set up an aio request from a SMBwriteX call.
*****************************************************************************/
bool schedule_aio_write_and_X(connection_struct *conn,
struct smb_request *req,
files_struct *fsp, char *data,
SMB_OFF_T startpos,
size_t numtowrite)
{
struct aio_extra *aio_ex;
SMB_STRUCT_AIOCB *a;
size_t inbufsize, outbufsize;
bool write_through = BITSETW(req->inbuf+smb_vwv7,0);
size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
if (!min_aio_write_size || (numtowrite < min_aio_write_size)) {
/* Too small a write for aio request. */
DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
"small for minimum aio_write of %u\n",
(unsigned int)numtowrite,
(unsigned int)min_aio_write_size ));
return False;
}
/* Only do this on non-chained and non-chaining reads not using the
* write cache. */
if (chain_size !=0 || (CVAL(req->inbuf,smb_vwv0) != 0xFF)
|| (lp_write_cache_size(SNUM(conn)) != 0) ) {
return False;
}
if (outstanding_aio_calls >= AIO_PENDING_SIZE) {
DEBUG(3,("schedule_aio_write_and_X: Already have %d aio "
"activities outstanding.\n",
outstanding_aio_calls ));
DEBUG(10,("schedule_aio_write_and_X: failed to schedule "
"aio_write for file %s, offset %.0f, len = %u "
"(mid = %u)\n",
fsp->fsp_name, (double)startpos,
(unsigned int)numtowrite,
(unsigned int)req->mid ));
return False;
}
inbufsize = smb_len(req->inbuf) + 4;
reply_outbuf(req, 6, 0);
outbufsize = smb_len(req->outbuf) + 4;
if (!(aio_ex = create_aio_ex_write(fsp, inbufsize, outbufsize,
req->mid))) {
DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
return False;
}
/* Copy the SMB header already setup in outbuf. */
memcpy(aio_ex->inbuf, req->inbuf, inbufsize);
/* Copy the SMB header already setup in outbuf. */
memcpy(aio_ex->outbuf, req->outbuf, outbufsize);
TALLOC_FREE(req->outbuf);
SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
a = &aio_ex->acb;
/* Now set up the aio record for the write call. */
a->aio_fildes = fsp->fh->fd;
a->aio_buf = aio_ex->inbuf + (PTR_DIFF(data, req->inbuf));
a->aio_nbytes = numtowrite;
a->aio_offset = startpos;
a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
a->aio_sigevent.sigev_value.sival_int = aio_ex->mid;
if (SMB_VFS_AIO_WRITE(fsp,a) == -1) {
DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
"Error %s\n", strerror(errno) ));
delete_aio_ex(aio_ex);
return False;
}
if (!write_through && !lp_syncalways(SNUM(fsp->conn))
&& fsp->aio_write_behind) {
/* Lie to the client and immediately claim we finished the
* write. */
SSVAL(aio_ex->outbuf,smb_vwv2,numtowrite);
SSVAL(aio_ex->outbuf,smb_vwv4,(numtowrite>>16)&1);
show_msg(aio_ex->outbuf);
if (!send_smb(smbd_server_fd(),aio_ex->outbuf)) {
exit_server_cleanly("handle_aio_write: send_smb "
"failed.");
}
DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
"behind for file %s\n", fsp->fsp_name ));
} else {
srv_defer_sign_response(aio_ex->mid);
}
outstanding_aio_calls++;
DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
"%s, offset %.0f, len = %u (mid = %u) "
"outstanding_aio_calls = %d\n",
fsp->fsp_name, (double)startpos, (unsigned int)numtowrite,
(unsigned int)aio_ex->mid, outstanding_aio_calls ));
return True;
}
/****************************************************************************
Complete the read and return the data or error back to the client.
Returns errno or zero if all ok.
*****************************************************************************/
static int handle_aio_read_complete(struct aio_extra *aio_ex)
{
int ret = 0;
int outsize;
char *outbuf = aio_ex->outbuf;
char *data = smb_buf(outbuf);
ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
if (nread < 0) {
/* We're relying here on the fact that if the fd is
closed then the aio will complete and aio_return
will return an error. Hopefully this is
true.... JRA. */
/* If errno is ECANCELED then don't return anything to the
* client. */
if (errno == ECANCELED) {
srv_cancel_sign_response(aio_ex->mid);
return 0;
}
DEBUG( 3,( "handle_aio_read_complete: file %s nread == -1. "
"Error = %s\n",
aio_ex->fsp->fsp_name, strerror(errno) ));
outsize = (UNIXERROR(ERRDOS,ERRnoaccess));
ret = errno;
} else {
outsize = set_message(outbuf,12,nread,False);
SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */
SSVAL(outbuf,smb_vwv5,nread);
SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1));
SSVAL(smb_buf(outbuf),-2,nread);
DEBUG( 3, ( "handle_aio_read_complete file %s max=%d "
"nread=%d\n",
aio_ex->fsp->fsp_name,
(int)aio_ex->acb.aio_nbytes, (int)nread ) );
}
smb_setlen(outbuf,outsize - 4);
show_msg(outbuf);
if (!send_smb(smbd_server_fd(),outbuf)) {
exit_server_cleanly("handle_aio_read_complete: send_smb "
"failed.");
}
DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed "
"for file %s, offset %.0f, len = %u\n",
aio_ex->fsp->fsp_name, (double)aio_ex->acb.aio_offset,
(unsigned int)nread ));
return ret;
}
/****************************************************************************
Complete the write and return the data or error back to the client.
Returns errno or zero if all ok.
*****************************************************************************/
static int handle_aio_write_complete(struct aio_extra *aio_ex)
{
int ret = 0;
files_struct *fsp = aio_ex->fsp;
char *outbuf = aio_ex->outbuf;
ssize_t numtowrite = aio_ex->acb.aio_nbytes;
ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
if (fsp->aio_write_behind) {
if (nwritten != numtowrite) {
if (nwritten == -1) {
DEBUG(5,("handle_aio_write_complete: "
"aio_write_behind failed ! File %s "
"is corrupt ! Error %s\n",
fsp->fsp_name, strerror(errno) ));
ret = errno;
} else {
DEBUG(0,("handle_aio_write_complete: "
"aio_write_behind failed ! File %s "
"is corrupt ! Wanted %u bytes but "
"only wrote %d\n", fsp->fsp_name,
(unsigned int)numtowrite,
(int)nwritten ));
ret = EIO;
}
} else {
DEBUG(10,("handle_aio_write_complete: "
"aio_write_behind completed for file %s\n",
fsp->fsp_name ));
}
return 0;
}
/* We don't need outsize or set_message here as we've already set the
fixed size length when we set up the aio call. */
if(nwritten == -1) {
DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. "
"nwritten == %d. Error = %s\n",
fsp->fsp_name, (unsigned int)numtowrite,
(int)nwritten, strerror(errno) ));
/* If errno is ECANCELED then don't return anything to the
* client. */
if (errno == ECANCELED) {
srv_cancel_sign_response(aio_ex->mid);
return 0;
}
UNIXERROR(ERRHRD,ERRdiskfull);
ret = errno;
} else {
bool write_through = BITSETW(aio_ex->inbuf+smb_vwv7,0);
NTSTATUS status;
SSVAL(outbuf,smb_vwv2,nwritten);
SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
if (nwritten < (ssize_t)numtowrite) {
SCVAL(outbuf,smb_rcls,ERRHRD);
SSVAL(outbuf,smb_err,ERRdiskfull);
}
DEBUG(3,("handle_aio_write: fnum=%d num=%d wrote=%d\n",
fsp->fnum, (int)numtowrite, (int)nwritten));
status = sync_file(fsp->conn,fsp, write_through);
if (!NT_STATUS_IS_OK(status)) {
UNIXERROR(ERRHRD,ERRdiskfull);
ret = errno;
DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n",
fsp->fsp_name, nt_errstr(status) ));
}
}
show_msg(outbuf);
if (!send_smb(smbd_server_fd(),outbuf)) {
exit_server_cleanly("handle_aio_write: send_smb failed.");
}
DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed "
"for file %s, offset %.0f, requested %u, written = %u\n",
fsp->fsp_name, (double)aio_ex->acb.aio_offset,
(unsigned int)numtowrite, (unsigned int)nwritten ));
return ret;
}
/****************************************************************************
Handle any aio completion. Returns True if finished (and sets *perr if err
was non-zero), False if not.
*****************************************************************************/
static bool handle_aio_completed(struct aio_extra *aio_ex, int *perr)
{
int err;
/* Ensure the operation has really completed. */
if (SMB_VFS_AIO_ERROR(aio_ex->fsp, &aio_ex->acb) == EINPROGRESS) {
DEBUG(10,( "handle_aio_completed: operation mid %u still in "
"process for file %s\n",
aio_ex->mid, aio_ex->fsp->fsp_name ));
return False;
}
if (aio_ex->read_req) {
err = handle_aio_read_complete(aio_ex);
} else {
err = handle_aio_write_complete(aio_ex);
}
if (err) {
*perr = err; /* Only save non-zero errors. */
}
return True;
}
/****************************************************************************
Handle any aio completion inline.
Returns non-zero errno if fail or zero if all ok.
*****************************************************************************/
int process_aio_queue(void)
{
int i;
int ret = 0;
BlockSignals(True, RT_SIGNAL_AIO);
DEBUG(10,("process_aio_queue: signals_received = %d\n",
(int)signals_received));
DEBUG(10,("process_aio_queue: outstanding_aio_calls = %d\n",
outstanding_aio_calls));
if (!signals_received) {
BlockSignals(False, RT_SIGNAL_AIO);
return 0;
}
/* Drain all the complete aio_reads. */
for (i = 0; i < signals_received; i++) {
uint16 mid = aio_pending_array[i];
files_struct *fsp = NULL;
struct aio_extra *aio_ex = find_aio_ex(mid);
if (!aio_ex) {
DEBUG(3,("process_aio_queue: Can't find record to "
"match mid %u.\n", (unsigned int)mid));
srv_cancel_sign_response(mid);
continue;
}
fsp = aio_ex->fsp;
if (fsp == NULL) {
/* file was closed whilst I/O was outstanding. Just
* ignore. */
DEBUG( 3,( "process_aio_queue: file closed whilst "
"aio outstanding.\n"));
srv_cancel_sign_response(mid);
continue;
}
if (!handle_aio_completed(aio_ex, &ret)) {
continue;
}
delete_aio_ex(aio_ex);
}
outstanding_aio_calls -= signals_received;
signals_received = 0;
BlockSignals(False, RT_SIGNAL_AIO);
return ret;
}
/****************************************************************************
We're doing write behind and the client closed the file. Wait up to 30
seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes
completed, errno to return if not.
*****************************************************************************/
#define SMB_TIME_FOR_AIO_COMPLETE_WAIT 29
int wait_for_aio_completion(files_struct *fsp)
{
struct aio_extra *aio_ex;
const SMB_STRUCT_AIOCB **aiocb_list;
int aio_completion_count = 0;
time_t start_time = time(NULL);
int seconds_left;
for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT;
seconds_left >= 0;) {
int err = 0;
int i;
struct timespec ts;
aio_completion_count = 0;
for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
if (aio_ex->fsp == fsp) {
aio_completion_count++;
}
}
if (!aio_completion_count) {
return 0;
}
DEBUG(3,("wait_for_aio_completion: waiting for %d aio events "
"to complete.\n", aio_completion_count ));
aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *,
aio_completion_count);
if (!aiocb_list) {
return ENOMEM;
}
for( i = 0, aio_ex = aio_list_head;
aio_ex;
aio_ex = aio_ex->next) {
if (aio_ex->fsp == fsp) {
aiocb_list[i++] = &aio_ex->acb;
}
}
/* Now wait up to seconds_left for completion. */
ts.tv_sec = seconds_left;
ts.tv_nsec = 0;
DEBUG(10,("wait_for_aio_completion: %d events, doing a wait "
"of %d seconds.\n",
aio_completion_count, seconds_left ));
err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list,
aio_completion_count, &ts);
DEBUG(10,("wait_for_aio_completion: returned err = %d, "
"errno = %s\n", err, strerror(errno) ));
if (err == -1 && errno == EAGAIN) {
DEBUG(0,("wait_for_aio_completion: aio_suspend timed "
"out waiting for %d events after a wait of "
"%d seconds\n", aio_completion_count,
seconds_left));
/* Timeout. */
cancel_aio_by_fsp(fsp);
SAFE_FREE(aiocb_list);
return EIO;
}
/* One or more events might have completed - process them if
* so. */
for( i = 0; i < aio_completion_count; i++) {
uint16 mid = aiocb_list[i]->aio_sigevent.sigev_value.sival_int;
aio_ex = find_aio_ex(mid);
if (!aio_ex) {
DEBUG(0, ("wait_for_aio_completion: mid %u "
"doesn't match an aio record\n",
(unsigned int)mid ));
continue;
}
if (!handle_aio_completed(aio_ex, &err)) {
continue;
}
delete_aio_ex(aio_ex);
}
SAFE_FREE(aiocb_list);
seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT
- (time(NULL) - start_time);
}
/* We timed out - we don't know why. Return ret if already an error,
* else EIO. */
DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting "
"for %d events\n",
aio_completion_count));
return EIO;
}
/****************************************************************************
Cancel any outstanding aio requests. The client doesn't care about the reply.
*****************************************************************************/
void cancel_aio_by_fsp(files_struct *fsp)
{
struct aio_extra *aio_ex;
for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
if (aio_ex->fsp == fsp) {
/* Don't delete the aio_extra record as we may have
completed and don't yet know it. Just do the
aio_cancel call and return. */
SMB_VFS_AIO_CANCEL(fsp,fsp->fh->fd, &aio_ex->acb);
aio_ex->fsp = NULL; /* fsp will be closed when we
* return. */
}
}
}
#else
bool aio_finished(void)
{
return False;
}
void initialize_async_io_handler(void)
{
}
int process_aio_queue(void)
{
return False;
}
bool schedule_aio_read_and_X(connection_struct *conn,
struct smb_request *req,
files_struct *fsp, SMB_OFF_T startpos,
size_t smb_maxcnt)
{
return False;
}
bool schedule_aio_write_and_X(connection_struct *conn,
struct smb_request *req,
files_struct *fsp, char *data,
SMB_OFF_T startpos,
size_t numtowrite)
{
return False;
}
void cancel_aio_by_fsp(files_struct *fsp)
{
}
int wait_for_aio_completion(files_struct *fsp)
{
return ENOSYS;
}
#endif