Unix SMB/CIFS implementation.
Blocking Locking functions
Copyright (C) Jeremy Allison 1998-2003
-
+
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/>.
*/
#include "includes.h"
+#include "smbd/globals.h"
-extern char *OutBuffer;
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LOCKING
/****************************************************************************
- This is the structure to queue to implement blocking locks.
- notify. It consists of the requesting SMB and the expiry time.
-*****************************************************************************/
+ Determine if this is a secondary element of a chained SMB.
+ **************************************************************************/
-typedef struct _blocking_lock_record {
- struct _blocking_lock_record *next;
- struct _blocking_lock_record *prev;
- int com_type;
- files_struct *fsp;
- time_t expire_time;
- int lock_num;
- SMB_BIG_UINT offset;
- SMB_BIG_UINT count;
- uint16 lock_pid;
- char *inbuf;
- int length;
-} blocking_lock_record;
-
-static blocking_lock_record *blocking_lock_queue;
+static void received_unlock_msg(struct messaging_context *msg,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data);
-/****************************************************************************
- Destructor for the above structure.
-****************************************************************************/
-
-static void free_blocking_lock_record(blocking_lock_record *blr)
+static void brl_timeout_fn(struct event_context *event_ctx,
+ struct timed_event *te,
+ struct timeval now,
+ void *private_data)
{
- DLIST_REMOVE(blocking_lock_queue, blr);
- SAFE_FREE(blr->inbuf);
- SAFE_FREE(blr);
+ SMB_ASSERT(brl_timeout == te);
+ TALLOC_FREE(brl_timeout);
+
+ change_to_root_user(); /* TODO: Possibly run all timed events as
+ * root */
+
+ process_blocking_lock_queue();
}
/****************************************************************************
- Get the files_struct given a particular queued SMB.
-*****************************************************************************/
+ We need a version of timeval_min that treats zero timval as infinite.
+****************************************************************************/
-static files_struct *get_fsp_from_pkt(char *inbuf)
+static struct timeval timeval_brl_min(const struct timeval *tv1,
+ const struct timeval *tv2)
{
- switch(CVAL(inbuf,smb_com)) {
- case SMBlock:
- case SMBlockread:
- return file_fsp(inbuf,smb_vwv0);
- case SMBlockingX:
- return file_fsp(inbuf,smb_vwv2);
- default:
- DEBUG(0,("get_fsp_from_pkt: PANIC - unknown type on blocking lock queue - exiting.!\n"));
- exit_server("PANIC - unknown type on blocking lock queue");
+ if (timeval_is_zero(tv1)) {
+ return *tv2;
}
- return NULL; /* Keep compiler happy. */
+ if (timeval_is_zero(tv2)) {
+ return *tv1;
+ }
+ return timeval_min(tv1, tv2);
}
/****************************************************************************
- Determine if this is a secondary element of a chained SMB.
- **************************************************************************/
+ After a change to blocking_lock_queue, recalculate the timed_event for the
+ next processing.
+****************************************************************************/
-static BOOL in_chained_smb(void)
+static bool recalc_brl_timeout(void)
{
- return (chain_size != 0);
+ struct blocking_lock_record *blr;
+ struct timeval next_timeout;
+ int max_brl_timeout = lp_parm_int(-1, "brl", "recalctime", 5);
+
+ TALLOC_FREE(brl_timeout);
+
+ next_timeout = timeval_zero();
+
+ for (blr = blocking_lock_queue; blr; blr = blr->next) {
+ if (timeval_is_zero(&blr->expire_time)) {
+ /*
+ * If we're blocked on pid 0xFFFFFFFF this is
+ * a POSIX lock, so calculate a timeout of
+ * 10 seconds into the future.
+ */
+ if (blr->blocking_pid == 0xFFFFFFFF) {
+ struct timeval psx_to = timeval_current_ofs(10, 0);
+ next_timeout = timeval_brl_min(&next_timeout, &psx_to);
+ }
+
+ continue;
+ }
+
+ next_timeout = timeval_brl_min(&next_timeout, &blr->expire_time);
+ }
+
+ if (timeval_is_zero(&next_timeout)) {
+ DEBUG(10, ("Next timeout = Infinite.\n"));
+ return True;
+ }
+
+ /*
+ to account for unclean shutdowns by clients we need a
+ maximum timeout that we use for checking pending locks. If
+ we have any pending locks at all, then check if the pending
+ lock can continue at least every brl:recalctime seconds
+ (default 5 seconds).
+
+ This saves us needing to do a message_send_all() in the
+ SIGCHLD handler in the parent daemon. That
+ message_send_all() caused O(n^2) work to be done when IP
+ failovers happened in clustered Samba, which could make the
+ entire system unusable for many minutes.
+ */
+
+ if (max_brl_timeout > 0) {
+ struct timeval min_to = timeval_current_ofs(max_brl_timeout, 0);
+ next_timeout = timeval_min(&next_timeout, &min_to);
+ }
+
+ if (DEBUGLVL(10)) {
+ struct timeval cur, from_now;
+
+ cur = timeval_current();
+ from_now = timeval_until(&cur, &next_timeout);
+ DEBUG(10, ("Next timeout = %d.%d seconds from now.\n",
+ (int)from_now.tv_sec, (int)from_now.tv_usec));
+ }
+
+ if (!(brl_timeout = event_add_timed(smbd_event_context(), NULL,
+ next_timeout,
+ brl_timeout_fn, NULL))) {
+ return False;
+ }
+
+ return True;
}
-static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len);
/****************************************************************************
Function to push a blocking lock request onto the lock queue.
****************************************************************************/
-BOOL push_blocking_lock_request( char *inbuf, int length, int lock_timeout,
- int lock_num, uint16 lock_pid, SMB_BIG_UINT offset, SMB_BIG_UINT count)
+bool push_blocking_lock_request( struct byte_range_lock *br_lck,
+ struct smb_request *req,
+ files_struct *fsp,
+ int lock_timeout,
+ int lock_num,
+ uint32_t lock_pid,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ uint64_t offset,
+ uint64_t count,
+ uint32_t blocking_pid)
{
- static BOOL set_lock_msg;
- blocking_lock_record *blr, *tmp;
- BOOL my_lock_ctx = False;
+ struct blocking_lock_record *blr;
NTSTATUS status;
- if(in_chained_smb() ) {
+ if(req_is_in_chain(req)) {
DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
return False;
}
* the expiration time here.
*/
- if((blr = (blocking_lock_record *)malloc(sizeof(blocking_lock_record))) == NULL) {
+ blr = talloc(NULL, struct blocking_lock_record);
+ if (blr == NULL) {
DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
return False;
}
- if((blr->inbuf = (char *)malloc(length)) == NULL) {
- DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
- SAFE_FREE(blr);
- return False;
- }
+ blr->next = NULL;
+ blr->prev = NULL;
- blr->com_type = CVAL(inbuf,smb_com);
- blr->fsp = get_fsp_from_pkt(inbuf);
- blr->expire_time = (lock_timeout == -1) ? (time_t)-1 : time(NULL) + (time_t)lock_timeout;
+ blr->fsp = fsp;
+ if (lock_timeout == -1) {
+ blr->expire_time.tv_sec = 0;
+ blr->expire_time.tv_usec = 0; /* Never expire. */
+ } else {
+ blr->expire_time = timeval_current_ofs(lock_timeout/1000,
+ (lock_timeout % 1000) * 1000);
+ }
blr->lock_num = lock_num;
blr->lock_pid = lock_pid;
+ blr->blocking_pid = blocking_pid;
+ blr->lock_flav = lock_flav;
+ blr->lock_type = lock_type;
blr->offset = offset;
blr->count = count;
- memcpy(blr->inbuf, inbuf, length);
- blr->length = length;
+
+ /* Specific brl_lock() implementations can fill this in. */
+ blr->blr_private = NULL;
/* Add a pending lock record for this. */
- status = brl_lock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
- lock_pid, sys_getpid(), blr->fsp->conn->cnum,
- offset, count, PENDING_LOCK, &my_lock_ctx);
+ status = brl_lock(smbd_messaging_context(),
+ br_lck,
+ lock_pid,
+ procid_self(),
+ offset,
+ count,
+ lock_type == READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK,
+ blr->lock_flav,
+ True,
+ NULL,
+ blr);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
- free_blocking_lock_record(blr);
+ TALLOC_FREE(blr);
return False;
}
- DLIST_ADD_END(blocking_lock_queue, blr, tmp);
+ SMB_PERFCOUNT_DEFER_OP(&req->pcd, &req->pcd);
+ blr->req = talloc_move(blr, &req);
+
+ DLIST_ADD_END(blocking_lock_queue, blr, struct blocking_lock_record *);
+ recalc_brl_timeout();
/* Ensure we'll receive messages when this is unlocked. */
- if (!set_lock_msg) {
- message_register(MSG_SMB_UNLOCK, received_unlock_msg);
- set_lock_msg = True;
+ if (!blocking_lock_unlock_state) {
+ messaging_register(smbd_messaging_context(), NULL,
+ MSG_SMB_UNLOCK, received_unlock_msg);
+ blocking_lock_unlock_state = true;
}
- DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d (+%d) \
-for fnum = %d, name = %s\n", length, (int)blr->expire_time, lock_timeout,
- blr->fsp->fnum, blr->fsp->fsp_name ));
-
- /* Push the MID of this packet on the signing queue. */
- srv_defer_sign_response(SVAL(inbuf,smb_mid));
+ DEBUG(3,("push_blocking_lock_request: lock request blocked with "
+ "expiry time (%u sec. %u usec) (+%d msec) for fnum = %d, name = %s\n",
+ (unsigned int)blr->expire_time.tv_sec,
+ (unsigned int)blr->expire_time.tv_usec, lock_timeout,
+ blr->fsp->fnum, fsp_str_dbg(blr->fsp)));
return True;
}
-/****************************************************************************
- Return a smd with a given size.
-*****************************************************************************/
-
-static void send_blocking_reply(char *outbuf, int outsize)
-{
- if(outsize > 4)
- smb_setlen(outbuf,outsize - 4);
-
- if (!send_smb(smbd_server_fd(),outbuf))
- exit_server("send_blocking_reply: send_smb failed.");
-}
-
/****************************************************************************
Return a lockingX success SMB.
*****************************************************************************/
-static void reply_lockingX_success(blocking_lock_record *blr)
+static void reply_lockingX_success(struct blocking_lock_record *blr)
{
- char *outbuf = OutBuffer;
- int bufsize = BUFFER_SIZE;
- char *inbuf = blr->inbuf;
- int outsize = 0;
-
- construct_reply_common(inbuf, outbuf);
- set_message(outbuf,2,0,True);
+ reply_outbuf(blr->req, 2, 0);
/*
* As this message is a lockingX call we must handle
* that here and must set up the chain info manually.
*/
- outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
-
- outsize += chain_size;
-
- send_blocking_reply(outbuf,outsize);
+ chain_reply(blr->req);
+ TALLOC_FREE(blr->req->outbuf);
}
/****************************************************************************
Return a generic lock fail error blocking call.
*****************************************************************************/
-static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
+static void generic_blocking_lock_error(struct blocking_lock_record *blr, NTSTATUS status)
{
- char *outbuf = OutBuffer;
- char *inbuf = blr->inbuf;
- construct_reply_common(inbuf, outbuf);
-
/* whenever a timeout is given w2k maps LOCK_NOT_GRANTED to
FILE_LOCK_CONFLICT! (tridge) */
if (NT_STATUS_EQUAL(status, NT_STATUS_LOCK_NOT_GRANTED)) {
status = NT_STATUS_FILE_LOCK_CONFLICT;
}
- ERROR_NT(status);
- if (!send_smb(smbd_server_fd(),outbuf))
- exit_server("generic_blocking_lock_error: send_smb failed.");
+ if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
+ /* Store the last lock error. */
+ files_struct *fsp = blr->fsp;
+
+ if (fsp) {
+ fsp->last_lock_failure.context.smbpid = blr->lock_pid;
+ fsp->last_lock_failure.context.tid = fsp->conn->cnum;
+ fsp->last_lock_failure.context.pid = procid_self();
+ fsp->last_lock_failure.start = blr->offset;
+ fsp->last_lock_failure.size = blr->count;
+ fsp->last_lock_failure.fnum = fsp->fnum;
+ fsp->last_lock_failure.lock_type = READ_LOCK; /* Don't care. */
+ fsp->last_lock_failure.lock_flav = blr->lock_flav;
+ }
+ }
+
+ reply_nterror(blr->req, status);
+ if (!srv_send_smb(smbd_server_fd(), (char *)blr->req->outbuf,
+ true, blr->req->seqnum+1,
+ blr->req->encrypted, NULL)) {
+ exit_server_cleanly("generic_blocking_lock_error: srv_send_smb failed.");
+ }
+ TALLOC_FREE(blr->req->outbuf);
}
/****************************************************************************
obtained first.
*****************************************************************************/
-static void reply_lockingX_error(blocking_lock_record *blr, NTSTATUS status)
+static void reply_lockingX_error(struct blocking_lock_record *blr, NTSTATUS status)
{
- char *inbuf = blr->inbuf;
files_struct *fsp = blr->fsp;
- connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
- uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
- SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
- uint16 lock_pid;
- unsigned char locktype = CVAL(inbuf,smb_vwv3);
- BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
- char *data;
+ uint16 num_ulocks = SVAL(blr->req->vwv+6, 0);
+ uint64_t count = (uint64_t)0, offset = (uint64_t) 0;
+ uint32 lock_pid;
+ unsigned char locktype = CVAL(blr->req->vwv+3, 0);
+ bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
+ uint8_t *data;
int i;
- data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
-
+ data = (uint8_t *)blr->req->buf
+ + ((large_file_format ? 20 : 10)*num_ulocks);
+
/*
* Data now points at the beginning of the list
* of smb_lkrng structs.
* as under POSIX rules, if we have a lock already there, we
* will delete it (and we shouldn't) .....
*/
-
+
for(i = blr->lock_num - 1; i >= 0; i--) {
- BOOL err;
-
+ bool err;
+
lock_pid = get_lock_pid( data, i, large_file_format);
count = get_lock_count( data, i, large_file_format);
offset = get_lock_offset( data, i, large_file_format, &err);
-
+
/*
* We know err cannot be set as if it was the lock
* request would never have been queued. JRA.
*/
-
- do_unlock(fsp,conn,lock_pid,count,offset);
+
+ do_unlock(smbd_messaging_context(),
+ fsp,
+ lock_pid,
+ count,
+ offset,
+ WINDOWS_LOCK);
}
-
+
generic_blocking_lock_error(blr, status);
}
Return a lock fail error.
*****************************************************************************/
-static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
+static void blocking_lock_reply_error(struct blocking_lock_record *blr, NTSTATUS status)
{
- switch(blr->com_type) {
- case SMBlock:
- case SMBlockread:
- generic_blocking_lock_error(blr, status);
- break;
+ DEBUG(10, ("Replying with error=%s. BLR = %p\n", nt_errstr(status), blr));
+
+ switch(blr->req->cmd) {
case SMBlockingX:
reply_lockingX_error(blr, status);
break;
- default:
- DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
- exit_server("PANIC - unknown type on blocking lock queue");
- }
-}
-
-/****************************************************************************
- Attempt to finish off getting all pending blocking locks for a lockread call.
- Returns True if we want to be removed from the list.
-*****************************************************************************/
-
-static BOOL process_lockread(blocking_lock_record *blr)
-{
- char *outbuf = OutBuffer;
- char *inbuf = blr->inbuf;
- ssize_t nread = -1;
- char *data, *p;
- int outsize = 0;
- SMB_BIG_UINT startpos;
- size_t numtoread;
- NTSTATUS status;
- connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
- files_struct *fsp = blr->fsp;
- BOOL my_lock_ctx = False;
-
- numtoread = SVAL(inbuf,smb_vwv1);
- startpos = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv2);
-
- numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
- data = smb_buf(outbuf) + 3;
-
- status = do_lock_spin( fsp, conn, SVAL(inbuf,smb_pid), (SMB_BIG_UINT)numtoread, startpos, READ_LOCK, &my_lock_ctx);
- if (NT_STATUS_V(status)) {
- if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
- !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
- /*
- * We have other than a "can't get lock"
- * error. Send an error.
- * Return True so we get dequeued.
- */
- generic_blocking_lock_error(blr, status);
- return True;
- }
+ case SMBtrans2:
+ case SMBtranss2:
+ reply_nterror(blr->req, status);
/*
- * Still waiting for lock....
+ * construct_reply_common has done us the favor to pre-fill
+ * the command field with SMBtranss2 which is wrong :-)
*/
-
- DEBUG(10,("process_lockread: failed to get lock for file = %s. Still waiting....\n",
- fsp->fsp_name));
- return False;
- }
-
- nread = read_file(fsp,data,startpos,numtoread);
-
- if (nread < 0) {
- generic_blocking_lock_error(blr,NT_STATUS_ACCESS_DENIED);
- return True;
- }
-
- construct_reply_common(inbuf, outbuf);
- outsize = set_message(outbuf,5,0,True);
-
- outsize += nread;
- SSVAL(outbuf,smb_vwv0,nread);
- SSVAL(outbuf,smb_vwv5,nread+3);
- p = smb_buf(outbuf);
- *p++ = 1;
- SSVAL(p,0,nread); p += 2;
- set_message_end(outbuf, p+nread);
-
- DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%d nread=%d\n",
- fsp->fsp_name, fsp->fnum, (int)numtoread, (int)nread ) );
-
- send_blocking_reply(outbuf,outsize);
- return True;
-}
-
-/****************************************************************************
- Attempt to finish off getting all pending blocking locks for a lock call.
- Returns True if we want to be removed from the list.
-*****************************************************************************/
-
-static BOOL process_lock(blocking_lock_record *blr)
-{
- char *outbuf = OutBuffer;
- char *inbuf = blr->inbuf;
- int outsize;
- SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
- NTSTATUS status;
- connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
- files_struct *fsp = blr->fsp;
- BOOL my_lock_ctx = False;
-
- count = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
- offset = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
-
- errno = 0;
- status = do_lock_spin(fsp, conn, SVAL(inbuf,smb_pid), count, offset, WRITE_LOCK, &my_lock_ctx);
- if (NT_STATUS_IS_ERR(status)) {
- if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
- !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
- /*
- * We have other than a "can't get lock"
- * error. Send an error.
- * Return True so we get dequeued.
- */
-
- blocking_lock_reply_error(blr, status);
- return True;
+ SCVAL(blr->req->outbuf,smb_com,SMBtrans2);
+
+ if (!srv_send_smb(smbd_server_fd(),
+ (char *)blr->req->outbuf,
+ true, blr->req->seqnum+1,
+ IS_CONN_ENCRYPTED(blr->fsp->conn),
+ NULL)) {
+ exit_server_cleanly("blocking_lock_reply_error: "
+ "srv_send_smb failed.");
}
- /*
- * Still can't get the lock - keep waiting.
- */
- DEBUG(10,("process_lock: failed to get lock for file = %s. Still waiting....\n",
- fsp->fsp_name));
- return False;
+ TALLOC_FREE(blr->req->outbuf);
+ break;
+ default:
+ DEBUG(0,("blocking_lock_reply_error: PANIC - unknown type on blocking lock queue - exiting.!\n"));
+ exit_server("PANIC - unknown type on blocking lock queue");
}
-
- /*
- * Success - we got the lock.
- */
-
- DEBUG(3,("process_lock : file=%s fnum=%d offset=%.0f count=%.0f\n",
- fsp->fsp_name, fsp->fnum, (double)offset, (double)count));
-
- construct_reply_common(inbuf, outbuf);
- outsize = set_message(outbuf,0,0,True);
- send_blocking_reply(outbuf,outsize);
- return True;
}
/****************************************************************************
Returns True if we want to be removed from the list.
*****************************************************************************/
-static BOOL process_lockingX(blocking_lock_record *blr)
+static bool process_lockingX(struct blocking_lock_record *blr)
{
- char *inbuf = blr->inbuf;
- unsigned char locktype = CVAL(inbuf,smb_vwv3);
+ unsigned char locktype = CVAL(blr->req->vwv+3, 0);
files_struct *fsp = blr->fsp;
- connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
- uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
- uint16 num_locks = SVAL(inbuf,smb_vwv7);
- SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
- uint16 lock_pid;
- BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
- char *data;
- BOOL my_lock_ctx = False;
+ uint16 num_ulocks = SVAL(blr->req->vwv+6, 0);
+ uint16 num_locks = SVAL(blr->req->vwv+7, 0);
+ uint64_t count = (uint64_t)0, offset = (uint64_t)0;
+ uint32 lock_pid;
+ bool large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
+ uint8_t *data;
NTSTATUS status = NT_STATUS_OK;
- data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
+ data = (uint8_t *)blr->req->buf
+ + ((large_file_format ? 20 : 10)*num_ulocks);
/*
* Data now points at the beginning of the list
* of smb_lkrng structs.
*/
-
+
for(; blr->lock_num < num_locks; blr->lock_num++) {
- BOOL err;
+ struct byte_range_lock *br_lck = NULL;
+ bool err;
lock_pid = get_lock_pid( data, blr->lock_num, large_file_format);
count = get_lock_count( data, blr->lock_num, large_file_format);
offset = get_lock_offset( data, blr->lock_num, large_file_format, &err);
-
+
/*
* We know err cannot be set as if it was the lock
* request would never have been queued. JRA.
*/
errno = 0;
- status = do_lock_spin(fsp,conn,lock_pid,count,offset,
- ((locktype & 1) ? READ_LOCK : WRITE_LOCK), &my_lock_ctx);
- if (NT_STATUS_IS_ERR(status)) break;
+ br_lck = do_lock(smbd_messaging_context(),
+ fsp,
+ lock_pid,
+ count,
+ offset,
+ ((locktype & LOCKING_ANDX_SHARED_LOCK) ?
+ READ_LOCK : WRITE_LOCK),
+ WINDOWS_LOCK,
+ True,
+ &status,
+ &blr->blocking_pid,
+ blr);
+
+ TALLOC_FREE(br_lck);
+
+ if (NT_STATUS_IS_ERR(status)) {
+ break;
+ }
}
if(blr->lock_num == num_locks) {
/*
* Success - we got all the locks.
*/
-
- DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d num_locks=%d\n",
- fsp->fsp_name, fsp->fnum, (unsigned int)locktype, num_locks) );
+
+ DEBUG(3,("process_lockingX file = %s, fnum=%d type=%d "
+ "num_locks=%d\n", fsp_str_dbg(fsp), fsp->fnum,
+ (unsigned int)locktype, num_locks));
reply_lockingX_success(blr);
return True;
- } else if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
- !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
- /*
- * We have other than a "can't get lock"
- * error. Free any locks we had and return an error.
- * Return True so we get dequeued.
- */
-
+ }
+
+ if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
+ !NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
+ /*
+ * We have other than a "can't get lock"
+ * error. Free any locks we had and return an error.
+ * Return True so we get dequeued.
+ */
blocking_lock_reply_error(blr, status);
return True;
}
/*
* Still can't get all the locks - keep waiting.
*/
-
+
DEBUG(10,("process_lockingX: only got %d locks of %d needed for file %s, fnum = %d. \
Waiting....\n",
- blr->lock_num, num_locks, fsp->fsp_name, fsp->fnum));
-
+ blr->lock_num, num_locks, fsp_str_dbg(fsp), fsp->fnum));
+
return False;
}
+/****************************************************************************
+ Attempt to get the posix lock request from a SMBtrans2 call.
+ Returns True if we want to be removed from the list.
+*****************************************************************************/
+
+static bool process_trans2(struct blocking_lock_record *blr)
+{
+ char params[2];
+ NTSTATUS status;
+ struct byte_range_lock *br_lck = do_lock(smbd_messaging_context(),
+ blr->fsp,
+ blr->lock_pid,
+ blr->count,
+ blr->offset,
+ blr->lock_type,
+ blr->lock_flav,
+ True,
+ &status,
+ &blr->blocking_pid,
+ blr);
+ TALLOC_FREE(br_lck);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ if (ERROR_WAS_LOCK_DENIED(status)) {
+ /* Still can't get the lock, just keep waiting. */
+ return False;
+ }
+ /*
+ * We have other than a "can't get lock"
+ * error. Send an error and return True so we get dequeued.
+ */
+ blocking_lock_reply_error(blr, status);
+ return True;
+ }
+
+ /* We finally got the lock, return success. */
+
+ SSVAL(params,0,0);
+ /* Fake up max_data_bytes here - we know it fits. */
+ send_trans2_replies(blr->fsp->conn, blr->req, params, 2, NULL, 0, 0xffff);
+ return True;
+}
+
+
/****************************************************************************
Process a blocking lock SMB.
Returns True if we want to be removed from the list.
*****************************************************************************/
-static BOOL blocking_lock_record_process(blocking_lock_record *blr)
+static bool blocking_lock_record_process(struct blocking_lock_record *blr)
{
- switch(blr->com_type) {
- case SMBlock:
- return process_lock(blr);
- case SMBlockread:
- return process_lockread(blr);
+ switch(blr->req->cmd) {
case SMBlockingX:
return process_lockingX(blr);
+ case SMBtrans2:
+ case SMBtranss2:
+ return process_trans2(blr);
default:
DEBUG(0,("blocking_lock_record_process: PANIC - unknown type on blocking lock queue - exiting.!\n"));
exit_server("PANIC - unknown type on blocking lock queue");
}
/****************************************************************************
- Delete entries by fnum from the blocking lock pending queue.
+ Cancel entries by fnum from the blocking lock pending queue.
*****************************************************************************/
-void remove_pending_lock_requests_by_fid(files_struct *fsp)
+void cancel_pending_lock_requests_by_fid(files_struct *fsp, struct byte_range_lock *br_lck)
{
- blocking_lock_record *blr, *next = NULL;
+ struct blocking_lock_record *blr, *blr_cancelled, *next = NULL;
for(blr = blocking_lock_queue; blr; blr = next) {
- next = blr->next;
- if(blr->fsp->fnum == fsp->fnum) {
-
- DEBUG(10,("remove_pending_lock_requests_by_fid - removing request type %d for \
-file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
+ unsigned char locktype = 0;
- brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
- blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
- blr->offset, blr->count, True, NULL, NULL);
+ next = blr->next;
+ if (blr->fsp->fnum != fsp->fnum) {
+ continue;
+ }
- free_blocking_lock_record(blr);
+ if (blr->req->cmd == SMBlockingX) {
+ locktype = CVAL(blr->req->vwv+3, 0);
}
+
+ DEBUG(10, ("remove_pending_lock_requests_by_fid - removing "
+ "request type %d for file %s fnum = %d\n",
+ blr->req->cmd, fsp_str_dbg(fsp), fsp->fnum));
+
+ blr_cancelled = blocking_lock_cancel(fsp,
+ blr->lock_pid,
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ locktype,
+ NT_STATUS_RANGE_NOT_LOCKED);
+
+ SMB_ASSERT(blr_cancelled == blr);
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ blr);
+
+ /* We're closing the file fsp here, so ensure
+ * we don't have a dangling pointer. */
+ blr->fsp = NULL;
}
}
void remove_pending_lock_requests_by_mid(int mid)
{
- blocking_lock_record *blr, *next = NULL;
+ struct blocking_lock_record *blr, *next = NULL;
for(blr = blocking_lock_queue; blr; blr = next) {
+ files_struct *fsp;
+ struct byte_range_lock *br_lck;
+
next = blr->next;
- if(SVAL(blr->inbuf,smb_mid) == mid) {
- files_struct *fsp = blr->fsp;
- DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
-file %s fnum = %d\n", blr->com_type, fsp->fsp_name, fsp->fnum ));
+ if (blr->req->mid != mid) {
+ continue;
+ }
- blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
- brl_unlock(blr->fsp->dev, blr->fsp->inode, blr->fsp->fnum,
- blr->lock_pid, sys_getpid(), blr->fsp->conn->cnum,
- blr->offset, blr->count, True, NULL, NULL);
- free_blocking_lock_record(blr);
+ fsp = blr->fsp;
+ br_lck = brl_get_locks(talloc_tos(), fsp);
+
+ if (br_lck) {
+ DEBUG(10, ("remove_pending_lock_requests_by_mid - "
+ "removing request type %d for file %s fnum "
+ "= %d\n", blr->req->cmd, fsp_str_dbg(fsp),
+ fsp->fnum ));
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ blr);
+ TALLOC_FREE(br_lck);
}
+
+ blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ TALLOC_FREE(blr);
}
}
/****************************************************************************
- Set a flag as an unlock request affects one of our pending locks.
+ Is this mid a blocking lock request on the queue ?
*****************************************************************************/
-static void received_unlock_msg(int msg_type, pid_t src, void *buf, size_t len)
+bool blocking_lock_was_deferred(int mid)
{
- DEBUG(10,("received_unlock_msg\n"));
- process_blocking_lock_queue(time(NULL));
+ struct blocking_lock_record *blr, *next = NULL;
+
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(blr->req->mid == mid) {
+ return True;
+ }
+ }
+ return False;
}
/****************************************************************************
- Return the number of seconds to the next blocking locks timeout, or default_timeout
+ Set a flag as an unlock request affects one of our pending locks.
*****************************************************************************/
-unsigned blocking_locks_timeout(unsigned default_timeout)
+static void received_unlock_msg(struct messaging_context *msg,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
{
- unsigned timeout = default_timeout;
- time_t t;
- blocking_lock_record *blr = blocking_lock_queue;
-
- /* note that we avoid the time() syscall if there are no blocking locks */
- if (!blr)
- return timeout;
-
- t = time(NULL);
-
- for (; blr; blr = blr->next) {
- if ((blr->expire_time != (time_t)-1) &&
- (timeout > (blr->expire_time - t))) {
- timeout = blr->expire_time - t;
- }
- }
-
- if (timeout < 1)
- timeout = 1;
-
- return timeout;
+ DEBUG(10,("received_unlock_msg\n"));
+ process_blocking_lock_queue();
}
/****************************************************************************
Process the blocking lock queue. Note that this is only called as root.
*****************************************************************************/
-void process_blocking_lock_queue(time_t t)
+void process_blocking_lock_queue(void)
{
- blocking_lock_record *blr, *next = NULL;
+ struct timeval tv_curr = timeval_current();
+ struct blocking_lock_record *blr, *next = NULL;
/*
* Go through the queue and see if we can get any of the locks.
*/
for (blr = blocking_lock_queue; blr; blr = next) {
- connection_struct *conn = NULL;
- uint16 vuid;
- files_struct *fsp = NULL;
next = blr->next;
/*
- * Ensure we don't have any old chain_fsp values
- * sitting around....
+ * Go through the remaining locks and try and obtain them.
+ * The call returns True if all locks were obtained successfully
+ * and False if we still need to wait.
+ */
+
+ DEBUG(10, ("Processing BLR = %p\n", blr));
+
+ /* We use set_current_service so connections with
+ * pending locks are not marked as idle.
+ */
+
+ set_current_service(blr->fsp->conn,
+ SVAL(blr->req->inbuf,smb_flg),
+ false);
+
+ if(blocking_lock_record_process(blr)) {
+ struct byte_range_lock *br_lck = brl_get_locks(
+ talloc_tos(), blr->fsp);
+
+ DEBUG(10, ("BLR_process returned true: cancelling and "
+ "removing lock. BLR = %p\n", blr));
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ blr);
+ TALLOC_FREE(br_lck);
+ }
+
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ TALLOC_FREE(blr);
+ continue;
+ }
+
+ /*
+ * We couldn't get the locks for this record on the list.
+ * If the time has expired, return a lock error.
*/
- chain_size = 0;
- file_chain_reset();
- fsp = blr->fsp;
- conn = conn_find(SVAL(blr->inbuf,smb_tid));
- vuid = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID :
- SVAL(blr->inbuf,smb_uid);
+ if (!timeval_is_zero(&blr->expire_time) && timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
+ struct byte_range_lock *br_lck = brl_get_locks(
+ talloc_tos(), blr->fsp);
- DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
- fsp->fnum, fsp->fsp_name ));
+ DEBUG(10, ("Lock timed out! BLR = %p\n", blr));
- if((blr->expire_time != -1) && (blr->expire_time <= t)) {
/*
* Lock expired - throw away all previously
* obtained locks and return lock error.
*/
- DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
- fsp->fnum, fsp->fsp_name ));
- brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
- blr->lock_pid, sys_getpid(), conn->cnum,
- blr->offset, blr->count, True, NULL, NULL);
+ if (br_lck) {
+ DEBUG(5,("process_blocking_lock_queue: "
+ "pending lock fnum = %d for file %s "
+ "timed out.\n", blr->fsp->fnum,
+ fsp_str_dbg(blr->fsp)));
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ blr);
+ TALLOC_FREE(br_lck);
+ }
blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
- free_blocking_lock_record(blr);
- continue;
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ TALLOC_FREE(blr);
}
+ }
- if(!change_to_user(conn,vuid)) {
- DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
- vuid ));
- /*
- * Remove the entry and return an error to the client.
- */
- blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
+ recalc_brl_timeout();
+}
- brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
- blr->lock_pid, sys_getpid(), conn->cnum,
- blr->offset, blr->count, True, NULL, NULL);
+/****************************************************************************
+ Handle a cancel message. Lock already moved onto the cancel queue.
+*****************************************************************************/
- free_blocking_lock_record(blr);
- continue;
- }
+#define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(struct blocking_lock_record *) + sizeof(NTSTATUS))
- if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
- DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
- /*
- * Remove the entry and return an error to the client.
- */
- blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
+static void process_blocking_lock_cancel_message(struct messaging_context *ctx,
+ void *private_data,
+ uint32_t msg_type,
+ struct server_id server_id,
+ DATA_BLOB *data)
+{
+ NTSTATUS err;
+ const char *msg = (const char *)data->data;
+ struct blocking_lock_record *blr;
- brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
- blr->lock_pid, sys_getpid(), conn->cnum,
- blr->offset, blr->count, True, NULL, NULL);
+ if (data->data == NULL) {
+ smb_panic("process_blocking_lock_cancel_message: null msg");
+ }
- free_blocking_lock_record(blr);
- change_to_root_user();
- continue;
- }
+ if (data->length != MSG_BLOCKING_LOCK_CANCEL_SIZE) {
+ DEBUG(0, ("process_blocking_lock_cancel_message: "
+ "Got invalid msg len %d\n", (int)data->length));
+ smb_panic("process_blocking_lock_cancel_message: bad msg");
+ }
- /*
- * Go through the remaining locks and try and obtain them.
- * The call returns True if all locks were obtained successfully
- * and False if we still need to wait.
- */
+ memcpy(&blr, msg, sizeof(blr));
+ memcpy(&err, &msg[sizeof(blr)], sizeof(NTSTATUS));
- if(blocking_lock_record_process(blr)) {
+ DEBUG(10,("process_blocking_lock_cancel_message: returning error %s\n",
+ nt_errstr(err) ));
- brl_unlock(fsp->dev, fsp->inode, fsp->fnum,
- blr->lock_pid, sys_getpid(), conn->cnum,
- blr->offset, blr->count, True, NULL, NULL);
+ blocking_lock_reply_error(blr, err);
+ DLIST_REMOVE(blocking_lock_cancelled_queue, blr);
+ TALLOC_FREE(blr);
+}
+
+/****************************************************************************
+ Send ourselves a blocking lock cancelled message. Handled asynchronously above.
+ Returns the blocking_lock_record that is being cancelled.
+*****************************************************************************/
- free_blocking_lock_record(blr);
+struct blocking_lock_record *blocking_lock_cancel(files_struct *fsp,
+ uint32 lock_pid,
+ uint64_t offset,
+ uint64_t count,
+ enum brl_flavour lock_flav,
+ unsigned char locktype,
+ NTSTATUS err)
+{
+ char msg[MSG_BLOCKING_LOCK_CANCEL_SIZE];
+ struct blocking_lock_record *blr;
+
+ if (!blocking_lock_cancel_state) {
+ /* Register our message. */
+ messaging_register(smbd_messaging_context(), NULL,
+ MSG_SMB_BLOCKING_LOCK_CANCEL,
+ process_blocking_lock_cancel_message);
+
+ blocking_lock_cancel_state = True;
+ }
+
+ for (blr = blocking_lock_queue; blr; blr = blr->next) {
+ if (fsp == blr->fsp &&
+ lock_pid == blr->lock_pid &&
+ offset == blr->offset &&
+ count == blr->count &&
+ lock_flav == blr->lock_flav) {
+ break;
}
- change_to_root_user();
}
+
+ if (!blr) {
+ return NULL;
+ }
+
+ /* Check the flags are right. */
+ if (blr->req->cmd == SMBlockingX &&
+ (locktype & LOCKING_ANDX_LARGE_FILES) !=
+ (CVAL(blr->req->vwv+3, 0) & LOCKING_ANDX_LARGE_FILES)) {
+ return NULL;
+ }
+
+ /* Move to cancelled queue. */
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ DLIST_ADD(blocking_lock_cancelled_queue, blr);
+
+ /* Create the message. */
+ memcpy(msg, &blr, sizeof(blr));
+ memcpy(&msg[sizeof(blr)], &err, sizeof(NTSTATUS));
+
+ messaging_send_buf(smbd_messaging_context(), procid_self(),
+ MSG_SMB_BLOCKING_LOCK_CANCEL,
+ (uint8 *)&msg, sizeof(msg));
+
+ return blr;
}
git.samba.org / abartlet / samba.git / .git / blobdiff