1
0
mirror of https://github.com/samba-team/samba.git synced 2024-12-23 17:34:34 +03:00
samba-mirror/source3/smbd/oplock.c

808 lines
24 KiB
C
Raw Normal View History

/*
Unix SMB/CIFS implementation.
oplock processing
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998 - 2001
Copyright (C) Volker Lendecke 2005
2011-08-02 18:44:53 +04:00
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.
2011-08-02 18:44:53 +04:00
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.
2011-08-02 18:44:53 +04:00
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define DBGC_CLASS DBGC_LOCKING
#include "includes.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "messages.h"
2011-11-24 17:11:28 +04:00
#include "../librpc/gen_ndr/open_files.h"
/*
* helper function used by the kernel oplock backends to post the break message
*/
void break_kernel_oplock(struct messaging_context *msg_ctx, files_struct *fsp)
{
uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
/* Put the kernel break info into the message. */
push_file_id_24((char *)msg, &fsp->file_id);
SIVAL(msg,24,fsp->fh->gen_id);
/* Don't need to be root here as we're only ever
sending to ourselves. */
messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
MSG_SMB_KERNEL_BREAK,
msg, MSG_SMB_KERNEL_BREAK_SIZE);
}
/****************************************************************************
Attempt to set an oplock on a file. Succeeds if kernel oplocks are
disabled (just sets flags).
****************************************************************************/
NTSTATUS set_file_oplock(files_struct *fsp)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
if (fsp->oplock_type == LEVEL_II_OPLOCK) {
if (use_kernel &&
!(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) {
DEBUG(10, ("Refusing level2 oplock, kernel oplocks "
"don't support them\n"));
return NT_STATUS_NOT_SUPPORTED;
}
}
if ((fsp->oplock_type != NO_OPLOCK) &&
use_kernel &&
!koplocks->ops->set_oplock(koplocks, fsp, fsp->oplock_type))
{
return map_nt_error_from_unix(errno);
}
fsp->sent_oplock_break = NO_BREAK_SENT;
if (fsp->oplock_type == LEVEL_II_OPLOCK) {
sconn->oplocks.level_II_open++;
} else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
sconn->oplocks.exclusive_open++;
}
DEBUG(5,("set_file_oplock: granted oplock on file %s, %s/%lu, "
"tv_sec = %x, tv_usec = %x\n",
fsp_str_dbg(fsp), file_id_string_tos(&fsp->file_id),
fsp->fh->gen_id, (int)fsp->open_time.tv_sec,
(int)fsp->open_time.tv_usec ));
return NT_STATUS_OK;
}
/****************************************************************************
Attempt to release an oplock on a file. Decrements oplock count.
****************************************************************************/
static void release_file_oplock(files_struct *fsp)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
if ((fsp->oplock_type != NO_OPLOCK) &&
koplocks) {
koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
}
if (fsp->oplock_type == LEVEL_II_OPLOCK) {
sconn->oplocks.level_II_open--;
} else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
sconn->oplocks.exclusive_open--;
}
SMB_ASSERT(sconn->oplocks.exclusive_open>=0);
SMB_ASSERT(sconn->oplocks.level_II_open>=0);
fsp->oplock_type = NO_OPLOCK;
fsp->sent_oplock_break = NO_BREAK_SENT;
flush_write_cache(fsp, SAMBA_OPLOCK_RELEASE_FLUSH);
delete_write_cache(fsp);
TALLOC_FREE(fsp->oplock_timeout);
}
/****************************************************************************
Attempt to downgrade an oplock on a file. Doesn't decrement oplock count.
****************************************************************************/
static void downgrade_file_oplock(files_struct *fsp)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
DEBUG(0, ("trying to downgrade an already-downgraded oplock!\n"));
return;
}
if (koplocks) {
koplocks->ops->release_oplock(koplocks, fsp, LEVEL_II_OPLOCK);
}
fsp->oplock_type = LEVEL_II_OPLOCK;
sconn->oplocks.exclusive_open--;
sconn->oplocks.level_II_open++;
fsp->sent_oplock_break = NO_BREAK_SENT;
TALLOC_FREE(fsp->oplock_timeout);
}
/****************************************************************************
Remove a file oplock. Copes with level II and exclusive.
Locks then unlocks the share mode lock. Client can decide to go directly
to none even if a "break-to-level II" was sent.
****************************************************************************/
bool remove_oplock(files_struct *fsp)
{
bool ret;
struct share_mode_lock *lck;
DEBUG(10, ("remove_oplock called for %s\n",
fsp_str_dbg(fsp)));
/* Remove the oplock flag from the sharemode. */
lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
if (lck == NULL) {
DEBUG(0,("remove_oplock: failed to lock share entry for "
"file %s\n", fsp_str_dbg(fsp)));
return False;
}
if (fsp->oplock_type == LEVEL_II_OPLOCK) {
/*
* If we're the only LEVEL_II holder, we have to remove the
* have_read_oplocks from the brlock entry
*/
struct share_mode_data *data = lck->data;
uint32_t i, num_level2;
num_level2 = 0;
for (i=0; i<data->num_share_modes; i++) {
if (data->share_modes[i].op_type == LEVEL_II_OPLOCK) {
num_level2 += 1;
}
if (num_level2 > 1) {
/*
* No need to count them all...
*/
break;
}
}
if (num_level2 == 1) {
/*
* That's only us. We are dropping that level2 oplock,
* so remove the brlock flag.
*/
struct byte_range_lock *brl;
brl = brl_get_locks(talloc_tos(), fsp);
if (brl) {
brl_set_have_read_oplocks(brl, false);
TALLOC_FREE(brl);
}
}
}
ret = remove_share_oplock(lck, fsp);
if (!ret) {
DEBUG(0,("remove_oplock: failed to remove share oplock for "
"file %s, %s, %s\n",
fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
file_id_string_tos(&fsp->file_id)));
}
release_file_oplock(fsp);
TALLOC_FREE(lck);
return ret;
}
/*
* Deal with a reply when a break-to-level II was sent.
*/
bool downgrade_oplock(files_struct *fsp)
{
bool ret;
struct share_mode_lock *lck;
struct byte_range_lock *brl;
DEBUG(10, ("downgrade_oplock called for %s\n",
fsp_str_dbg(fsp)));
lck = get_existing_share_mode_lock(talloc_tos(), fsp->file_id);
if (lck == NULL) {
DEBUG(0,("downgrade_oplock: failed to lock share entry for "
"file %s\n", fsp_str_dbg(fsp)));
return False;
}
ret = downgrade_share_oplock(lck, fsp);
if (!ret) {
DEBUG(0,("downgrade_oplock: failed to downgrade share oplock "
"for file %s, %s, file_id %s\n",
fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
file_id_string_tos(&fsp->file_id)));
}
downgrade_file_oplock(fsp);
brl = brl_get_locks(talloc_tos(), fsp);
if (brl != NULL) {
brl_set_have_read_oplocks(brl, true);
TALLOC_FREE(brl);
}
TALLOC_FREE(lck);
return ret;
}
/****************************************************************************
Set up an oplock break message.
****************************************************************************/
#define SMB1_BREAK_MESSAGE_LENGTH (smb_size + 8*2)
static void new_break_message_smb1(files_struct *fsp, int cmd,
char result[SMB1_BREAK_MESSAGE_LENGTH])
{
memset(result,'\0',smb_size);
srv_set_message(result,8,0,true);
SCVAL(result,smb_com,SMBlockingX);
SSVAL(result,smb_tid,fsp->conn->cnum);
SSVAL(result,smb_pid,0xFFFF);
SSVAL(result,smb_uid,0);
SSVAL(result,smb_mid,0xFFFF);
SCVAL(result,smb_vwv0,0xFF);
SSVAL(result,smb_vwv2,fsp->fnum);
SCVAL(result,smb_vwv3,LOCKING_ANDX_OPLOCK_RELEASE);
SCVAL(result,smb_vwv3+1,cmd);
}
/****************************************************************************
Function to do the waiting before sending a local break.
****************************************************************************/
static void wait_before_sending_break(void)
{
long wait_time = (long)lp_oplock_break_wait_time();
if (wait_time) {
smb_msleep(wait_time);
}
}
/****************************************************************************
Ensure that we have a valid oplock.
****************************************************************************/
static files_struct *initial_break_processing(
struct smbd_server_connection *sconn, struct file_id id,
unsigned long file_id)
{
files_struct *fsp = NULL;
DEBUG(3, ("initial_break_processing: called for %s/%u\n"
"Current oplocks_open (exclusive = %d, levelII = %d)\n",
file_id_string_tos(&id), (int)file_id,
sconn->oplocks.exclusive_open,
sconn->oplocks.level_II_open));
/*
* We need to search the file open table for the
* entry containing this dev and inode, and ensure
* we have an oplock on it.
*/
fsp = file_find_dif(sconn, id, file_id);
if(fsp == NULL) {
/* The file could have been closed in the meantime - return success. */
DEBUG(3, ("initial_break_processing: cannot find open file "
"with file_id %s gen_id = %lu, allowing break to "
"succeed.\n", file_id_string_tos(&id), file_id));
return NULL;
}
/* Ensure we have an oplock on the file */
/*
* There is a potential race condition in that an oplock could
* have been broken due to another udp request, and yet there are
* still oplock break messages being sent in the udp message
* queue for this file. So return true if we don't have an oplock,
* as we may have just freed it.
*/
if(fsp->oplock_type == NO_OPLOCK) {
DEBUG(3, ("initial_break_processing: file %s (file_id = %s "
"gen_id = %lu) has no oplock. Allowing break to "
"succeed regardless.\n", fsp_str_dbg(fsp),
file_id_string_tos(&id), fsp->fh->gen_id));
return NULL;
}
return fsp;
}
static void oplock_timeout_handler(struct tevent_context *ctx,
struct tevent_timer *te,
struct timeval now,
void *private_data)
{
files_struct *fsp = (files_struct *)private_data;
SMB_ASSERT(fsp->sent_oplock_break != NO_BREAK_SENT);
/* Remove the timed event handler. */
TALLOC_FREE(fsp->oplock_timeout);
DEBUG(0, ("Oplock break failed for file %s -- replying anyway\n",
fsp_str_dbg(fsp)));
remove_oplock(fsp);
}
/*******************************************************************
Add a timeout handler waiting for the client reply.
*******************************************************************/
static void add_oplock_timeout_handler(files_struct *fsp)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
/*
* If kernel oplocks already notifies smbds when an oplock break times
* out, just return.
*/
if (koplocks &&
(koplocks->flags & KOPLOCKS_TIMEOUT_NOTIFICATION)) {
return;
}
if (fsp->oplock_timeout != NULL) {
DEBUG(0, ("Logic problem -- have an oplock event hanging "
"around\n"));
}
fsp->oplock_timeout =
tevent_add_timer(fsp->conn->sconn->ev_ctx, fsp,
timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
oplock_timeout_handler, fsp);
if (fsp->oplock_timeout == NULL) {
DEBUG(0, ("Could not add oplock timeout handler\n"));
}
}
static void send_break_message_smb1(files_struct *fsp, int level)
{
struct smbXsrv_connection *xconn = fsp->conn->sconn->conn;
char break_msg[SMB1_BREAK_MESSAGE_LENGTH];
new_break_message_smb1(fsp, level, break_msg);
show_msg(break_msg);
if (!srv_send_smb(xconn,
break_msg, false, 0,
IS_CONN_ENCRYPTED(fsp->conn),
NULL)) {
exit_server_cleanly("send_break_message_smb1: "
"srv_send_smb failed.");
}
}
/*******************************************************************
This handles the generic oplock break message from another smbd.
*******************************************************************/
static void process_oplock_break_message(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct share_mode_entry msg;
files_struct *fsp;
bool break_to_level2 = False;
bool use_kernel;
struct smbd_server_connection *sconn =
talloc_get_type_abort(private_data,
struct smbd_server_connection);
struct server_id self = messaging_server_id(sconn->msg_ctx);
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
uint16_t break_to;
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
/* De-linearize incoming message. */
message_to_share_mode_entry(&msg, (char *)data->data);
break_to = msg.op_type;
DEBUG(10, ("Got oplock break to %u message from pid %s: %s/%llu\n",
(unsigned)break_to, server_id_str(talloc_tos(), &src),
2011-12-02 18:03:05 +04:00
file_id_string_tos(&msg.id),
(unsigned long long)msg.share_file_id));
fsp = initial_break_processing(sconn, msg.id, msg.share_file_id);
if (fsp == NULL) {
2010-01-19 18:51:33 +03:00
/* We hit a race here. Break messages are sent, and before we
* get to process this message, we have closed the file. */
DEBUG(3, ("Did not find fsp\n"));
return;
}
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
/*
* Nothing to do anymore
*/
return;
}
if (break_to == fsp->oplock_type) {
DEBUG(3, ("Already downgraded oplock on %s: %s\n",
file_id_string_tos(&fsp->file_id),
fsp_str_dbg(fsp)));
return;
}
use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
(break_to != NO_OPLOCK) &&
!(use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) &&
lp_level2_oplocks(SNUM(fsp->conn))) {
break_to_level2 = True;
}
/* Need to wait before sending a break
message if we sent ourselves this message. */
if (serverid_equal(&self, &src)) {
wait_before_sending_break();
}
if (sconn->using_smb2) {
send_break_message_smb2(fsp, break_to_level2 ?
OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
} else {
send_break_message_smb1(fsp, break_to_level2 ?
OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
}
if ((fsp->oplock_type == LEVEL_II_OPLOCK) && (break_to == NO_OPLOCK)) {
/*
* This is an async break without a reply and thus no timeout
*/
remove_oplock(fsp);
return;
}
fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
add_oplock_timeout_handler(fsp);
}
/*******************************************************************
This handles the kernel oplock break message.
*******************************************************************/
static void process_kernel_oplock_break(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id src,
DATA_BLOB *data)
{
struct file_id id;
unsigned long file_id;
files_struct *fsp;
struct smbd_server_connection *sconn =
talloc_get_type_abort(private_data,
struct smbd_server_connection);
if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
/* Pull the data from the message. */
pull_file_id_24((char *)data->data, &id);
file_id = (unsigned long)IVAL(data->data, 24);
DEBUG(10, ("Got kernel oplock break message from pid %s: %s/%u\n",
server_id_str(talloc_tos(), &src), file_id_string_tos(&id),
(unsigned int)file_id));
fsp = initial_break_processing(sconn, id, file_id);
if (fsp == NULL) {
DEBUG(3, ("Got a kernel oplock break message for a file "
"I don't know about\n"));
return;
}
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
/* This is ok, kernel oplocks come in completely async */
DEBUG(3, ("Got a kernel oplock request while waiting for a "
"break reply\n"));
return;
}
if (sconn->using_smb2) {
send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
} else {
send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
}
fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
add_oplock_timeout_handler(fsp);
}
struct break_to_none_state {
struct smbd_server_connection *sconn;
struct file_id id;
};
static void do_break_to_none(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data);
/****************************************************************************
This function is called on any file modification or lock request. If a file
is level 2 oplocked then it must tell all other level 2 holders to break to
none.
****************************************************************************/
static void contend_level2_oplocks_begin_default(files_struct *fsp,
enum level2_contention_type type)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct tevent_immediate *im;
struct break_to_none_state *state;
struct byte_range_lock *brl;
/*
* If this file is level II oplocked then we need
* to grab the shared memory lock and inform all
* other files with a level II lock that they need
* to flush their read caches. We keep the lock over
* the shared memory area whilst doing this.
*/
if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
/*
* There can't be any level2 oplocks, we're alone.
*/
return;
}
brl = brl_get_locks_readonly(fsp);
if ((brl != NULL) && !brl_have_read_oplocks(brl)) {
DEBUG(10, ("No read oplocks around\n"));
return;
}
/*
* When we get here we might have a brlock entry locked. Also
* locking the share mode entry would violate the locking
* order. Breaking level2 oplocks to none is asynchronous
* anyway, so we postpone this into an immediate event.
*/
state = talloc(sconn, struct break_to_none_state);
if (state == NULL) {
DEBUG(1, ("talloc failed\n"));
return;
}
state->sconn = sconn;
state->id = fsp->file_id;
im = tevent_create_immediate(state);
if (im == NULL) {
DEBUG(1, ("tevent_create_immediate failed\n"));
TALLOC_FREE(state);
return;
}
tevent_schedule_immediate(im, sconn->ev_ctx, do_break_to_none, state);
}
static void do_break_to_none(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data)
{
struct break_to_none_state *state = talloc_get_type_abort(
private_data, struct break_to_none_state);
int i;
struct share_mode_lock *lck;
lck = get_existing_share_mode_lock(talloc_tos(), state->id);
if (lck == NULL) {
DEBUG(1, ("%s: failed to lock share mode entry for file %s.\n",
__func__, file_id_string_tos(&state->id)));
goto done;
}
DEBUG(10,("%s: num_share_modes = %d\n", __func__,
lck->data->num_share_modes ));
for(i = 0; i < lck->data->num_share_modes; i++) {
struct share_mode_entry *share_entry = &lck->data->share_modes[i];
char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
if (!is_valid_share_mode_entry(share_entry)) {
continue;
}
/*
* As there could have been multiple writes waiting at the
* lock_share_entry gate we may not be the first to
* enter. Hence the state of the op_types in the share mode
* entries may be partly NO_OPLOCK and partly LEVEL_II
* oplock. It will do no harm to re-send break messages to
* those smbd's that are still waiting their turn to remove
* their LEVEL_II state, and also no harm to ignore existing
* NO_OPLOCK states. JRA.
*/
DEBUG(10,("%s: share_entry[%i]->op_type == %d\n", __func__,
i, share_entry->op_type ));
if (share_entry->op_type == NO_OPLOCK) {
continue;
}
/* Paranoia .... */
if (EXCLUSIVE_OPLOCK_TYPE(share_entry->op_type)) {
DEBUG(0,("%s: PANIC. "
"share mode entry %d is an exlusive "
"oplock !\n", __func__, i ));
TALLOC_FREE(lck);
abort();
}
share_mode_entry_to_message(msg, share_entry);
/* Overload entry->op_type */
SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET, NO_OPLOCK);
messaging_send_buf(state->sconn->msg_ctx, share_entry->pid,
MSG_SMB_BREAK_REQUEST,
(uint8 *)msg, sizeof(msg));
}
/* We let the message receivers handle removing the oplock state
in the share mode lock db. */
TALLOC_FREE(lck);
done:
TALLOC_FREE(state);
return;
}
void smbd_contend_level2_oplocks_begin(files_struct *fsp,
enum level2_contention_type type)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
if (koplocks && koplocks->ops->contend_level2_oplocks_begin) {
koplocks->ops->contend_level2_oplocks_begin(fsp, type);
return;
}
contend_level2_oplocks_begin_default(fsp, type);
}
void smbd_contend_level2_oplocks_end(files_struct *fsp,
enum level2_contention_type type)
{
struct smbd_server_connection *sconn = fsp->conn->sconn;
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
/* Only kernel oplocks implement this so far */
if (koplocks && koplocks->ops->contend_level2_oplocks_end) {
koplocks->ops->contend_level2_oplocks_end(fsp, type);
}
}
/****************************************************************************
Linearize a share mode entry struct to an internal oplock break message.
****************************************************************************/
void share_mode_entry_to_message(char *msg, const struct share_mode_entry *e)
{
SIVAL(msg,OP_BREAK_MSG_PID_OFFSET,(uint32)e->pid.pid);
SBVAL(msg,OP_BREAK_MSG_MID_OFFSET,e->op_mid);
SSVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET,e->op_type);
SIVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET,e->access_mask);
SIVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET,e->share_access);
SIVAL(msg,OP_BREAK_MSG_PRIV_OFFSET,e->private_options);
SIVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET,(uint32_t)e->time.tv_sec);
SIVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET,(uint32_t)e->time.tv_usec);
push_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
SIVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET,e->share_file_id);
SIVAL(msg,OP_BREAK_MSG_UID_OFFSET,e->uid);
SSVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET,e->flags);
SIVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET,e->name_hash);
SIVAL(msg,OP_BREAK_MSG_VNN_OFFSET,e->pid.vnn);
}
/****************************************************************************
De-linearize an internal oplock break message to a share mode entry struct.
****************************************************************************/
void message_to_share_mode_entry(struct share_mode_entry *e, const char *msg)
{
e->pid.pid = (pid_t)IVAL(msg,OP_BREAK_MSG_PID_OFFSET);
e->op_mid = BVAL(msg,OP_BREAK_MSG_MID_OFFSET);
e->op_type = SVAL(msg,OP_BREAK_MSG_OP_TYPE_OFFSET);
e->access_mask = IVAL(msg,OP_BREAK_MSG_ACCESS_MASK_OFFSET);
e->share_access = IVAL(msg,OP_BREAK_MSG_SHARE_ACCESS_OFFSET);
e->private_options = IVAL(msg,OP_BREAK_MSG_PRIV_OFFSET);
e->time.tv_sec = (time_t)IVAL(msg,OP_BREAK_MSG_TIME_SEC_OFFSET);
e->time.tv_usec = (int)IVAL(msg,OP_BREAK_MSG_TIME_USEC_OFFSET);
pull_file_id_24(msg+OP_BREAK_MSG_DEV_OFFSET, &e->id);
e->share_file_id = (unsigned long)IVAL(msg,OP_BREAK_MSG_FILE_ID_OFFSET);
e->uid = (uint32)IVAL(msg,OP_BREAK_MSG_UID_OFFSET);
e->flags = (uint16)SVAL(msg,OP_BREAK_MSG_FLAGS_OFFSET);
e->name_hash = IVAL(msg,OP_BREAK_MSG_NAME_HASH_OFFSET);
e->pid.vnn = IVAL(msg,OP_BREAK_MSG_VNN_OFFSET);
}
/****************************************************************************
Setup oplocks for this process.
****************************************************************************/
bool init_oplocks(struct smbd_server_connection *sconn)
{
DEBUG(3,("init_oplocks: initializing messages.\n"));
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_REQUEST,
process_oplock_break_message);
messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
process_kernel_oplock_break);
return true;
}
void init_kernel_oplocks(struct smbd_server_connection *sconn)
{
struct kernel_oplocks *koplocks = sconn->oplocks.kernel_ops;
/* only initialize once */
if (koplocks == NULL) {
#if HAVE_KERNEL_OPLOCKS_IRIX
koplocks = irix_init_kernel_oplocks(sconn);
#elif HAVE_KERNEL_OPLOCKS_LINUX
koplocks = linux_init_kernel_oplocks(sconn);
#endif
sconn->oplocks.kernel_ops = koplocks;
}
}