Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998 - 2001
Copyright (C) Volker Lendecke 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 2 of the License, or
+ 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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#define DBGC_CLASS DBGC_LOCKING
#include "includes.h"
-
-/* Current number of oplocks we have outstanding. */
-static int32 exclusive_oplocks_open = 0;
-static int32 level_II_oplocks_open = 0;
-BOOL global_client_failed_oplock_break = False;
-
-extern struct timeval smb_last_time;
-extern uint32 global_client_caps;
-extern int smb_read_error;
-
-static struct kernel_oplocks *koplocks;
+#include "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "messages.h"
+#include "../librpc/gen_ndr/open_files.h"
/****************************************************************************
Get the number of current exclusive oplocks.
return exclusive_oplocks_open;
}
-/****************************************************************************
- Return True if an oplock message is pending.
-****************************************************************************/
-
-BOOL oplock_message_waiting(fd_set *fds)
+/*
+ * 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)
{
- if (koplocks && koplocks->msg_waiting(fds))
- return True;
+ uint8_t msg[MSG_SMB_KERNEL_BREAK_SIZE];
- return False;
-}
+ /* Put the kernel break info into the message. */
+ push_file_id_24((char *)msg, &fsp->file_id);
+ SIVAL(msg,24,fsp->fh->gen_id);
-/****************************************************************************
- Read an oplock break message from either the oplock UDP fd or the
- kernel (if kernel oplocks are supported).
+ /* Don't need to be root here as we're only ever
+ sending to ourselves. */
- If timeout is zero then *fds contains the file descriptors that
- are ready to be read and acted upon. If timeout is non-zero then
- *fds contains the file descriptors to be selected on for read.
- The timeout is in milliseconds
+ 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) and no byte-range locks in the file. Returns True
+ if oplock set.
****************************************************************************/
-void process_kernel_oplocks(void)
+bool set_file_oplock(files_struct *fsp, int oplock_type)
{
- fd_set fds;
- FD_ZERO(&fds);
- smb_read_error = 0;
+ bool use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
- /*
- * We need to check for kernel oplocks before going into the select
- * here, as the EINTR generated by the linux kernel oplock may have
- * already been eaten. JRA.
- */
-
- if (!koplocks) {
- return;
- }
-
- while (koplocks->msg_waiting(&fds)) {
- files_struct *fsp;
- struct kernel_oplock_message msg;
-
- fsp = koplocks->receive_message(&fds);
-
- if (fsp == NULL) {
- DEBUG(3, ("Kernel oplock message announced, but none "
- "received\n"));
- return;
+ 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 false;
}
-
- msg.dev = fsp->dev;
- msg.inode = fsp->inode;
- msg.file_id = fsp->file_id;
- message_send_pid(pid_to_procid(sys_getpid()),
- MSG_SMB_KERNEL_BREAK,
- &msg, sizeof(msg), True);
}
-}
-/****************************************************************************
- Attempt to set an oplock on a file. Always succeeds if kernel oplocks are
- disabled (just sets flags). Returns True if oplock set.
-****************************************************************************/
-
-BOOL set_file_oplock(files_struct *fsp, int oplock_type)
-{
- if (koplocks && !koplocks->set_oplock(fsp, oplock_type))
+ if ((fsp->oplock_type != NO_OPLOCK) &&
+ (fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
+ use_kernel &&
+ !koplocks->ops->set_oplock(koplocks, fsp, oplock_type)) {
return False;
+ }
fsp->oplock_type = oplock_type;
fsp->sent_oplock_break = NO_BREAK_SENT;
- if (oplock_type == LEVEL_II_OPLOCK)
+ if (oplock_type == LEVEL_II_OPLOCK) {
level_II_oplocks_open++;
- else
+ } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
exclusive_oplocks_open++;
+ }
- DEBUG(5,("set_file_oplock: granted oplock on file %s, dev = %x, inode = %.0f, file_id = %lu, \
-tv_sec = %x, tv_usec = %x\n",
- fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id,
- (int)fsp->open_time.tv_sec, (int)fsp->open_time.tv_usec ));
+ 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 True;
}
if ((fsp->oplock_type != NO_OPLOCK) &&
(fsp->oplock_type != FAKE_LEVEL_II_OPLOCK) &&
koplocks) {
- koplocks->release_oplock(fsp);
+ koplocks->ops->release_oplock(koplocks, fsp, NO_OPLOCK);
}
- if (fsp->oplock_type == LEVEL_II_OPLOCK)
+ if (fsp->oplock_type == LEVEL_II_OPLOCK) {
level_II_oplocks_open--;
- else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type))
+ } else if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
exclusive_oplocks_open--;
+ }
SMB_ASSERT(exclusive_oplocks_open>=0);
SMB_ASSERT(level_II_oplocks_open>=0);
-
- fsp->oplock_type = NO_OPLOCK;
+
+ if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
+ /* This doesn't matter for close. */
+ fsp->oplock_type = FAKE_LEVEL_II_OPLOCK;
+ } else {
+ fsp->oplock_type = NO_OPLOCK;
+ }
fsp->sent_oplock_break = NO_BREAK_SENT;
-
+
flush_write_cache(fsp, OPLOCK_RELEASE_FLUSH);
+ delete_write_cache(fsp);
+
+ TALLOC_FREE(fsp->oplock_timeout);
}
/****************************************************************************
static void downgrade_file_oplock(files_struct *fsp)
{
- if (koplocks)
- koplocks->release_oplock(fsp);
+ 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;
exclusive_oplocks_open--;
level_II_oplocks_open++;
to none even if a "break-to-level II" was sent.
****************************************************************************/
-BOOL remove_oplock(files_struct *fsp)
+bool remove_oplock(files_struct *fsp)
{
- SMB_DEV_T dev = fsp->dev;
- SMB_INO_T inode = fsp->inode;
- BOOL ret;
+ bool ret;
struct share_mode_lock *lck;
/* Remove the oplock flag from the sharemode. */
- lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL);
+ 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->fsp_name ));
+ "file %s\n", fsp_str_dbg(fsp)));
return False;
}
ret = remove_share_oplock(lck, fsp);
if (!ret) {
DEBUG(0,("remove_oplock: failed to remove share oplock for "
- "file %s fnum %d, dev = %x, inode = %.0f\n",
- fsp->fsp_name, fsp->fnum, (unsigned int)dev,
- (double)inode));
+ "file %s fnum %d, %s\n",
+ fsp_str_dbg(fsp), fsp->fnum,
+ file_id_string_tos(&fsp->file_id)));
}
release_file_oplock(fsp);
- talloc_free(lck);
+ TALLOC_FREE(lck);
return ret;
}
/*
* Deal with a reply when a break-to-level II was sent.
*/
-BOOL downgrade_oplock(files_struct *fsp)
+bool downgrade_oplock(files_struct *fsp)
{
- SMB_DEV_T dev = fsp->dev;
- SMB_INO_T inode = fsp->inode;
- BOOL ret;
+ bool ret;
struct share_mode_lock *lck;
- lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL);
+ 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->fsp_name ));
+ "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 fnum %d, dev = %x, inode = %.0f\n",
- fsp->fsp_name, fsp->fnum, (unsigned int)dev,
- (double)inode));
+ "for file %s fnum %d, file_id %s\n",
+ fsp_str_dbg(fsp), fsp->fnum,
+ file_id_string_tos(&fsp->file_id)));
}
-
+
downgrade_file_oplock(fsp);
- talloc_free(lck);
+ TALLOC_FREE(lck);
return ret;
}
-/****************************************************************************
- Setup the listening set of file descriptors for an oplock break
- message either from the UDP socket or from the kernel. Returns the maximum
- fd used.
-****************************************************************************/
-
-int setup_oplock_select_set( fd_set *fds)
+/*
+ * Some kernel oplock implementations handle the notification themselves.
+ */
+bool should_notify_deferred_opens()
{
- int maxfd = 0;
-
- if (koplocks && koplocks->notification_fd != -1) {
- FD_SET(koplocks->notification_fd, fds);
- maxfd = MAX(maxfd, koplocks->notification_fd);
- }
-
- return maxfd;
+ return !(koplocks &&
+ (koplocks->flags & KOPLOCKS_DEFERRED_OPEN_NOTIFICATION));
}
/****************************************************************************
Set up an oplock break message.
****************************************************************************/
-static char *new_break_smb_message(TALLOC_CTX *mem_ctx,
- files_struct *fsp, uint8_t cmd)
+static char *new_break_message_smb1(TALLOC_CTX *mem_ctx,
+ files_struct *fsp, int cmd)
{
- char *result = TALLOC_ARRAY(mem_ctx, char, smb_size + 8*2 + 0);
+ char *result = talloc_array(mem_ctx, char, smb_size + 8*2 + 0);
if (result == NULL) {
DEBUG(0, ("talloc failed\n"));
}
memset(result,'\0',smb_size);
- set_message(result,8,0,True);
+ srv_set_message(result,8,0,true);
SCVAL(result,smb_com,SMBlockingX);
SSVAL(result,smb_tid,fsp->conn->cnum);
SSVAL(result,smb_pid,0xFFFF);
static void wait_before_sending_break(void)
{
- struct timeval cur_tv;
- long wait_left = (long)lp_oplock_break_wait_time();
-
- if (wait_left == 0)
- return;
+ long wait_time = (long)lp_oplock_break_wait_time();
- GetTimeOfDay(&cur_tv);
-
- wait_left -= ((cur_tv.tv_sec - smb_last_time.tv_sec)*1000) +
- ((cur_tv.tv_usec - smb_last_time.tv_usec)/1000);
-
- if(wait_left > 0) {
- wait_left = MIN(wait_left, 1000);
- sys_usleep(wait_left * 1000);
+ if (wait_time) {
+ smb_msleep(wait_time);
}
}
Ensure that we have a valid oplock.
****************************************************************************/
-static files_struct *initial_break_processing(SMB_DEV_T dev, SMB_INO_T inode, unsigned long file_id)
+static files_struct *initial_break_processing(
+ struct smbd_server_connection *sconn, struct file_id id,
+ unsigned long file_id)
{
files_struct *fsp = NULL;
if( DEBUGLVL( 3 ) ) {
- dbgtext( "initial_break_processing: called for dev = %x, inode = %.0f file_id = %lu\n",
- (unsigned int)dev, (double)inode, file_id);
+ dbgtext( "initial_break_processing: called for %s/%u\n",
+ file_id_string_tos(&id), (int)file_id);
dbgtext( "Current oplocks_open (exclusive = %d, levelII = %d)\n",
exclusive_oplocks_open, level_II_oplocks_open );
}
* we have an oplock on it.
*/
- fsp = file_find_dif(dev, inode, file_id);
+ fsp = file_find_dif(sconn, id, file_id);
if(fsp == NULL) {
/* The file could have been closed in the meantime - return success. */
if( DEBUGLVL( 3 ) ) {
dbgtext( "initial_break_processing: cannot find open file with " );
- dbgtext( "dev = %x, inode = %.0f file_id = %lu", (unsigned int)dev,
- (double)inode, file_id);
+ dbgtext( "file_id %s gen_id = %lu", file_id_string_tos(&id), file_id);
dbgtext( "allowing break to succeed.\n" );
}
return NULL;
if(fsp->oplock_type == NO_OPLOCK) {
if( DEBUGLVL( 3 ) ) {
- dbgtext( "initial_break_processing: file %s ", fsp->fsp_name );
- dbgtext( "(dev = %x, inode = %.0f, file_id = %lu) has no oplock.\n",
- (unsigned int)dev, (double)inode, fsp->file_id );
+ dbgtext( "initial_break_processing: file %s ",
+ fsp_str_dbg(fsp));
+ dbgtext( "(file_id = %s gen_id = %lu) has no oplock.\n",
+ file_id_string_tos(&id), fsp->fh->gen_id );
dbgtext( "Allowing break to succeed regardless.\n" );
}
return NULL;
return fsp;
}
-static void oplock_timeout_handler(struct timed_event *te,
- const struct timeval *now,
+static void oplock_timeout_handler(struct event_context *ctx,
+ struct timed_event *te,
+ struct timeval now,
void *private_data)
{
- files_struct *fsp = private_data;
+ files_struct *fsp = (files_struct *)private_data;
- DEBUG(0, ("Oplock break failed -- replying anyway\n"));
- global_client_failed_oplock_break = True;
+ /* 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);
reply_to_oplock_break_requests(fsp);
}
-static void process_oplock_break_message(int msg_type, struct process_id src,
- void *buf, size_t len)
+/*******************************************************************
+ Add a timeout handler waiting for the client reply.
+*******************************************************************/
+
+static void add_oplock_timeout_handler(files_struct *fsp)
+{
+ /*
+ * 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)
+{
+ char *break_msg = new_break_message_smb1(talloc_tos(),
+ fsp,
+ level);
+ if (break_msg == NULL) {
+ exit_server("Could not talloc break_msg\n");
+ }
+
+ show_msg(break_msg);
+ if (!srv_send_smb(fsp->conn->sconn,
+ break_msg, false, 0,
+ IS_CONN_ENCRYPTED(fsp->conn),
+ NULL)) {
+ exit_server_cleanly("send_break_message_smb1: "
+ "srv_send_smb failed.");
+ }
+
+ TALLOC_FREE(break_msg);
+}
+
+void break_level2_to_none_async(files_struct *fsp)
+{
+ struct smbd_server_connection *sconn = fsp->conn->sconn;
+
+ if (fsp->oplock_type == NO_OPLOCK) {
+ /* We already got a "break to none" message and we've handled
+ * it. just ignore. */
+ DEBUG(3, ("process_oplock_async_level2_break_message: already "
+ "broken to none, ignoring.\n"));
+ return;
+ }
+
+ if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
+ /* Don't tell the client, just downgrade. */
+ DEBUG(3, ("process_oplock_async_level2_break_message: "
+ "downgrading fake level 2 oplock.\n"));
+ remove_oplock(fsp);
+ return;
+ }
+
+ /* Ensure we're really at level2 state. */
+ SMB_ASSERT(fsp->oplock_type == LEVEL_II_OPLOCK);
+
+ DEBUG(10,("process_oplock_async_level2_break_message: sending break "
+ "to none message for fid %d, file %s\n", fsp->fnum,
+ fsp_str_dbg(fsp)));
+
+ /* Now send a break to none message to our client. */
+ if (sconn->using_smb2) {
+ send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
+ } else {
+ send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
+ }
+
+ /* Async level2 request, don't send a reply, just remove the oplock. */
+ remove_oplock(fsp);
+}
+
+/*******************************************************************
+ This handles the case of a write triggering a break to none
+ message on a level2 oplock.
+ When we get this message we may be in any of three states :
+ NO_OPLOCK, LEVEL_II, FAKE_LEVEL2. We only send a message to
+ the client for LEVEL2.
+*******************************************************************/
+
+static void process_oplock_async_level2_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;
+ 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_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);
+
+ DEBUG(10, ("Got oplock async level 2 break message from pid %s: "
+ "%s/%llu\n", server_id_str(talloc_tos(), &src),
+ 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) {
+ /* We hit a race here. Break messages are sent, and before we
+ * get to process this message, we have closed the file.
+ * No need to reply as this is an async message. */
+ DEBUG(3, ("process_oplock_async_level2_break_message: Did not find fsp, ignoring\n"));
+ return;
+ }
+
+ break_level2_to_none_async(fsp);
+}
+
+/*******************************************************************
+ 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 = buf;
+ struct share_mode_entry msg;
files_struct *fsp;
- char *break_msg;
- BOOL break_to_level2 = False;
- BOOL sign_state;
+ bool break_to_level2 = False;
+ bool use_kernel;
+ struct smbd_server_connection *sconn =
+ talloc_get_type_abort(private_data,
+ struct smbd_server_connection);
- if (buf == NULL) {
+ if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
- if (len != sizeof(*msg)) {
- DEBUG(0, ("Got invalid msg len %d\n", (int)len));
+ if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
+ DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
- DEBUG(10, ("Got oplock break message from pid %d: %d/%d/%d\n",
- (int)procid_to_pid(&src), (int)msg->dev, (int)msg->inode,
- (int)msg->share_file_id));
+ /* De-linearize incoming message. */
+ message_to_share_mode_entry(&msg, (char *)data->data);
- fsp = initial_break_processing(msg->dev, msg->inode,
- msg->share_file_id);
+ DEBUG(10, ("Got oplock break message from pid %s: %s/%llu\n",
+ server_id_str(talloc_tos(), &src),
+ 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) {
- /* We hit race here. Break messages are sent, and before we
+ /* We hit a race here. Break messages are sent, and before we
* get to process this message, we have closed the file. Reply
* with 'ok, oplock broken' */
DEBUG(3, ("Did not find fsp\n"));
- message_send_pid(src, MSG_SMB_BREAK_RESPONSE,
- msg, sizeof(*msg), True);
+
+ /* We just send the same message back. */
+ messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
+ (uint8 *)data->data,
+ MSG_SMB_SHARE_MODE_ENTRY_SIZE);
return;
}
if (fsp->sent_oplock_break != NO_BREAK_SENT) {
/* Remember we have to inform the requesting PID when the
* client replies */
- msg->pid = src;
- ADD_TO_ARRAY(NULL, struct share_mode_entry, *msg,
+ msg.pid = src;
+ ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
&fsp->pending_break_messages,
&fsp->num_pending_break_messages);
return;
}
- if (EXCLUSIVE_OPLOCK_TYPE(msg->op_type) &&
+ if (EXCLUSIVE_OPLOCK_TYPE(msg.op_type) &&
!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
- DEBUG(3, ("Already downgraded oplock on %.0f/%.0f: %s\n",
- (double)fsp->dev, (double)fsp->inode,
- fsp->fsp_name));
- message_send_pid(src, MSG_SMB_BREAK_RESPONSE,
- msg, sizeof(*msg), True);
+ DEBUG(3, ("Already downgraded oplock on %s: %s\n",
+ file_id_string_tos(&fsp->file_id),
+ fsp_str_dbg(fsp)));
+ /* We just send the same message back. */
+ messaging_send_buf(msg_ctx, src, MSG_SMB_BREAK_RESPONSE,
+ (uint8 *)data->data,
+ MSG_SMB_SHARE_MODE_ENTRY_SIZE);
return;
}
- if ((msg_type == MSG_SMB_BREAK_REQUEST) &&
- (global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
- !koplocks && /* NOTE: we force levelII off for kernel oplocks -
- * this will change when it is supported */
+ use_kernel = lp_kernel_oplocks(SNUM(fsp->conn)) && koplocks;
+
+ if ((global_client_caps & CAP_LEVEL_II_OPLOCKS) &&
+ !(msg.op_type & FORCE_OPLOCK_BREAK_TO_NONE) &&
+ !(use_kernel && !(koplocks->flags & KOPLOCKS_LEVEL2_SUPPORTED)) &&
lp_level2_oplocks(SNUM(fsp->conn))) {
break_to_level2 = True;
}
- break_msg = new_break_smb_message(NULL, fsp, break_to_level2 ?
- OPLOCKLEVEL_II : OPLOCKLEVEL_NONE);
- if (break_msg == NULL) {
- exit_server("Could not talloc break_msg\n");
- }
-
- /* Need to wait before sending a break message to a file of our own */
- if (procid_to_pid(&src) == sys_getpid()) {
+ /* Need to wait before sending a break
+ message if we sent ourselves this message. */
+ if (procid_is_me(&src)) {
wait_before_sending_break();
}
- /* Save the server smb signing state. */
- sign_state = srv_oplock_set_signing(False);
-
- show_msg(break_msg);
- if (!send_smb(smbd_server_fd(), break_msg)) {
- exit_server("oplock_break: send_smb failed.");
+ 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);
}
- /* Restore the sign state to what it was. */
- srv_oplock_set_signing(sign_state);
-
- talloc_free(break_msg);
+ fsp->sent_oplock_break = break_to_level2 ? LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
- if (msg_type == MSG_SMB_BREAK_REQUEST) {
- fsp->sent_oplock_break = break_to_level2 ?
- LEVEL_II_BREAK_SENT:BREAK_TO_NONE_SENT;
- } else {
- /* Async level2 request, don't send a reply */
- fsp->sent_oplock_break = ASYNC_LEVEL_II_BREAK_SENT;
- }
- msg->pid = src;
- ADD_TO_ARRAY(NULL, struct share_mode_entry, *msg,
+ msg.pid = src;
+ ADD_TO_ARRAY(NULL, struct share_mode_entry, msg,
&fsp->pending_break_messages,
&fsp->num_pending_break_messages);
- if (fsp->oplock_timeout != NULL) {
- DEBUG(0, ("Logic problem -- have an oplock event hanging "
- "around\n"));
- }
-
- fsp->oplock_timeout =
- add_timed_event(NULL,
- timeval_current_ofs(OPLOCK_BREAK_TIMEOUT, 0),
- "oplock_timeout_handler",
- oplock_timeout_handler, fsp);
-
- if (fsp->oplock_timeout == NULL) {
- DEBUG(0, ("Could not add oplock timeout handler\n"));
- }
+ add_oplock_timeout_handler(fsp);
}
-static void process_kernel_oplock_break(int msg_type, struct process_id src,
- void *buf, size_t len)
+/*******************************************************************
+ 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 kernel_oplock_message *msg = buf;
+ struct file_id id;
+ unsigned long file_id;
files_struct *fsp;
- char *break_msg;
- BOOL sign_state;
+ struct smbd_server_connection *sconn =
+ talloc_get_type_abort(private_data,
+ struct smbd_server_connection);
- if (buf == NULL) {
+ if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
- if (len != sizeof(*msg)) {
- DEBUG(0, ("Got invalid msg len %d\n", (int)len));
+ if (data->length != MSG_SMB_KERNEL_BREAK_SIZE) {
+ DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
- DEBUG(10, ("Got kernel oplock break message from pid %d: %d/%d/%d\n",
- (int)procid_to_pid(&src), (int)msg->dev, (int)msg->inode,
- (int)msg->file_id));
+ /* 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(msg->dev, msg->inode, msg->file_id);
+ fsp = initial_break_processing(sconn, id, file_id);
if (fsp == NULL) {
DEBUG(3, ("Got a kernel oplock break message for a file "
return;
}
- break_msg = new_break_smb_message(NULL, fsp, OPLOCKLEVEL_NONE);
- if (break_msg == NULL) {
- exit_server("Could not talloc break_msg\n");
- }
-
- /* Save the server smb signing state. */
- sign_state = srv_oplock_set_signing(False);
-
- show_msg(break_msg);
- if (!send_smb(smbd_server_fd(), break_msg)) {
- exit_server("oplock_break: send_smb failed.");
+ if (sconn->using_smb2) {
+ send_break_message_smb2(fsp, OPLOCKLEVEL_NONE);
+ } else {
+ send_break_message_smb1(fsp, OPLOCKLEVEL_NONE);
}
- /* Restore the sign state to what it was. */
- srv_oplock_set_signing(sign_state);
-
- talloc_free(break_msg);
-
fsp->sent_oplock_break = BREAK_TO_NONE_SENT;
+
+ add_oplock_timeout_handler(fsp);
}
void reply_to_oplock_break_requests(files_struct *fsp)
{
int i;
+ /*
+ * If kernel oplocks already notifies smbds when oplocks are
+ * broken/removed, just return.
+ */
+ if (koplocks &&
+ (koplocks->flags & KOPLOCKS_OPLOCK_BROKEN_NOTIFICATION)) {
+ return;
+ }
+
for (i=0; i<fsp->num_pending_break_messages; i++) {
- struct share_mode_entry *msg = &fsp->pending_break_messages[i];
- message_send_pid(msg->pid, MSG_SMB_BREAK_RESPONSE,
- msg, sizeof(*msg), True);
+ struct share_mode_entry *e = &fsp->pending_break_messages[i];
+ char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
+
+ share_mode_entry_to_message(msg, e);
+
+ messaging_send_buf(fsp->conn->sconn->msg_ctx, e->pid,
+ MSG_SMB_BREAK_RESPONSE,
+ (uint8 *)msg,
+ MSG_SMB_SHARE_MODE_ENTRY_SIZE);
}
SAFE_FREE(fsp->pending_break_messages);
fsp->num_pending_break_messages = 0;
- if (fsp->oplock_timeout != NULL) {
- talloc_free(fsp->oplock_timeout);
- fsp->oplock_timeout = NULL;
- }
+ TALLOC_FREE(fsp->oplock_timeout);
return;
}
-static void process_oplock_break_response(int msg_type, struct process_id src,
- void *buf, size_t len)
+static void process_oplock_break_response(struct messaging_context *msg_ctx,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id src,
+ DATA_BLOB *data)
{
- struct share_mode_entry *msg = buf;
+ struct share_mode_entry msg;
+ struct smbd_server_connection *sconn =
+ talloc_get_type_abort(private_data,
+ struct smbd_server_connection);
- if (buf == NULL) {
+ if (data->data == NULL) {
DEBUG(0, ("Got NULL buffer\n"));
return;
}
- if (len != sizeof(*msg)) {
- DEBUG(0, ("Got invalid msg len %d\n", (int)len));
+ if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
+ DEBUG(0, ("Got invalid msg len %u\n",
+ (unsigned int)data->length));
return;
}
- DEBUG(10, ("Got oplock break response from pid %d: %d/%d/%d mid %d\n",
- (int)procid_to_pid(&src), (int)msg->dev, (int)msg->inode,
- (int)msg->share_file_id, (int)msg->op_mid));
+ /* De-linearize incoming message. */
+ message_to_share_mode_entry(&msg, (char *)data->data);
- /* Here's the hack from open.c, store the mid in the 'port' field */
- schedule_deferred_open_smb_message(msg->op_mid);
+ DEBUG(10, ("Got oplock break response from pid %s: %s/%llu mid %llu\n",
+ server_id_str(talloc_tos(), &src),
+ file_id_string_tos(&msg.id),
+ (unsigned long long)msg.share_file_id,
+ (unsigned long long)msg.op_mid));
+
+ schedule_deferred_open_message_smb(sconn, msg.op_mid);
}
-static void process_open_retry_message(int msg_type, struct process_id src,
- void *buf, size_t len)
+static void process_open_retry_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 = buf;
-
- if (buf == NULL) {
+ struct share_mode_entry msg;
+ 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 (len != sizeof(*msg)) {
- DEBUG(0, ("Got invalid msg len %d\n", (int)len));
+ if (data->length != MSG_SMB_SHARE_MODE_ENTRY_SIZE) {
+ DEBUG(0, ("Got invalid msg len %d\n", (int)data->length));
return;
}
- DEBUG(10, ("Got open retry msg from pid %d: %d/%d mid %d\n",
- (int)procid_to_pid(&src), (int)msg->dev, (int)msg->inode,
- (int)msg->op_mid));
+ /* De-linearize incoming message. */
+ message_to_share_mode_entry(&msg, (char *)data->data);
- schedule_deferred_open_smb_message(msg->op_mid);
+ DEBUG(10, ("Got open retry msg from pid %s: %s mid %llu\n",
+ server_id_str(talloc_tos(), &src), file_id_string_tos(&msg.id),
+ (unsigned long long)msg.op_mid));
+
+ schedule_deferred_open_message_smb(sconn, msg.op_mid);
}
+struct break_to_none_state {
+ struct smbd_server_connection *sconn;
+ struct file_id id;
+};
+static void do_break_to_none(struct tevent_req *req);
+
/****************************************************************************
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.
****************************************************************************/
-void release_level_2_oplocks_on_change(files_struct *fsp)
+static void contend_level2_oplocks_begin_default(files_struct *fsp,
+ enum level2_contention_type type)
{
- int i;
- struct share_mode_lock *lck;
+ struct smbd_server_connection *sconn = fsp->conn->sconn;
+ struct tevent_req *req;
+ struct break_to_none_state *state;
/*
* If this file is level II oplocked then we need
if (!LEVEL_II_OPLOCK_TYPE(fsp->oplock_type))
return;
- lck = get_share_mode_lock(NULL, fsp->dev, fsp->inode, NULL);
+ /*
+ * 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 timed 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;
+
+ req = tevent_wakeup_send(state, sconn->ev_ctx, timeval_set(0, 0));
+ if (req == NULL) {
+ DEBUG(1, ("tevent_wakeup_send failed\n"));
+ TALLOC_FREE(state);
+ return;
+ }
+ tevent_req_set_callback(req, do_break_to_none, state);
+ return;
+}
+
+static void do_break_to_none(struct tevent_req *req)
+{
+ struct break_to_none_state *state = tevent_req_callback_data(
+ req, struct break_to_none_state);
+ bool ret;
+ int i;
+ struct share_mode_lock *lck;
+
+ ret = tevent_wakeup_recv(req);
+ TALLOC_FREE(req);
+ if (!ret) {
+ DEBUG(1, ("tevent_wakeup_recv failed\n"));
+ goto done;
+ }
+ lck = get_existing_share_mode_lock(talloc_tos(), state->id);
if (lck == NULL) {
- DEBUG(0,("release_level_2_oplocks_on_change: failed to lock "
- "share mode entry for file %s.\n", fsp->fsp_name ));
+ DEBUG(1, ("release_level_2_oplocks_on_change: failed to lock "
+ "share mode entry for file %s.\n",
+ file_id_string_tos(&state->id)));
+ goto done;
}
DEBUG(10,("release_level_2_oplocks_on_change: num_share_modes = %d\n",
- lck->num_share_modes ));
+ lck->data->num_share_modes ));
- if (fsp->oplock_type == FAKE_LEVEL_II_OPLOCK) {
- /* See if someone else has already downgraded us, then we
- don't have to do anything */
- for (i=0; i<lck->num_share_modes; i++) {
- struct share_mode_entry *e = &lck->share_modes[i];
- if ((e->op_type == NO_OPLOCK) &&
- (e->share_file_id == fsp->file_id) &&
- (e->dev == fsp->dev) &&
- (e->inode == fsp->inode) &&
- (procid_is_me(&e->pid))) {
- /* We're done */
- fsp->oplock_type = NO_OPLOCK;
- talloc_free(lck);
- return;
- }
- }
- }
+ 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];
- for(i = 0; i < lck->num_share_modes; i++) {
- struct share_mode_entry *share_entry = &lck->share_modes[i];
+ 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
+ * entries may be partly NO_OPLOCK and partly LEVEL_II or FAKE_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
"share_entry[%i]->op_type == %d\n",
i, share_entry->op_type ));
- if ((share_entry->op_type == NO_OPLOCK) ||
- (share_entry->op_type == FAKE_LEVEL_II_OPLOCK)) {
+ if (share_entry->op_type == NO_OPLOCK) {
continue;
}
DEBUG(0,("release_level_2_oplocks_on_change: PANIC. "
"share mode entry %d is an exlusive "
"oplock !\n", i ));
- talloc_free(lck);
+ TALLOC_FREE(lck);
abort();
}
- message_send_pid(share_entry->pid, MSG_SMB_ASYNC_LEVEL2_BREAK,
- share_entry, sizeof(*share_entry), True);
+ share_mode_entry_to_message(msg, share_entry);
+
+ /*
+ * Deal with a race condition when breaking level2
+ * oplocks. Don't send all the messages and release
+ * the lock, this allows someone else to come in and
+ * get a level2 lock before any of the messages are
+ * processed, and thus miss getting a break message.
+ * Ensure at least one entry (the one we're breaking)
+ * is processed immediately under the lock and becomes
+ * set as NO_OPLOCK to stop any waiter getting a level2.
+ * Bugid #5980.
+ */
+
+ if (procid_is_me(&share_entry->pid)) {
+ struct files_struct *cur_fsp =
+ initial_break_processing(state->sconn,
+ share_entry->id,
+ share_entry->share_file_id);
+ wait_before_sending_break();
+ if (cur_fsp != NULL) {
+ break_level2_to_none_async(cur_fsp);
+ } else {
+ DEBUG(3, ("release_level_2_oplocks_on_change: "
+ "Did not find fsp, ignoring\n"));
+ }
+ } else {
+ messaging_send_buf(state->sconn->msg_ctx,
+ share_entry->pid,
+ MSG_SMB_ASYNC_LEVEL2_BREAK,
+ (uint8 *)msg,
+ MSG_SMB_SHARE_MODE_ENTRY_SIZE);
+ }
}
- remove_all_share_oplocks(lck, fsp);
- talloc_free(lck);
+ /* 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)
+{
+ 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)
+{
+ /* 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, 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(void)
+bool init_oplocks(struct smbd_server_connection *sconn)
{
- DEBUG(3,("open_oplock_ipc: opening loopback UDP socket.\n"));
-
- message_register(MSG_SMB_BREAK_REQUEST,
- process_oplock_break_message);
- message_register(MSG_SMB_ASYNC_LEVEL2_BREAK,
- process_oplock_break_message);
- message_register(MSG_SMB_BREAK_RESPONSE,
- process_oplock_break_response);
- message_register(MSG_SMB_KERNEL_BREAK,
- process_kernel_oplock_break);
- message_register(MSG_SMB_OPEN_RETRY,
- process_open_retry_message);
-
- if (lp_kernel_oplocks()) {
+ 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_ASYNC_LEVEL2_BREAK,
+ process_oplock_async_level2_break_message);
+ messaging_register(sconn->msg_ctx, sconn, MSG_SMB_BREAK_RESPONSE,
+ process_oplock_break_response);
+ messaging_register(sconn->msg_ctx, sconn, MSG_SMB_KERNEL_BREAK,
+ process_kernel_oplock_break);
+ messaging_register(sconn->msg_ctx, sconn, MSG_SMB_OPEN_RETRY,
+ process_open_retry_message);
+
+ return true;
+}
+
+void init_kernel_oplocks(struct smbd_server_connection *sconn)
+{
+ /* only initialize once */
+ if (koplocks == NULL) {
#if HAVE_KERNEL_OPLOCKS_IRIX
- koplocks = irix_init_kernel_oplocks();
+ koplocks = irix_init_kernel_oplocks(sconn);
#elif HAVE_KERNEL_OPLOCKS_LINUX
- koplocks = linux_init_kernel_oplocks();
+ koplocks = linux_init_kernel_oplocks(sconn);
#endif
}
-
- return True;
}
git.samba.org / samba.git / blobdiff