/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
Blocking Locking functions
- Copyright (C) Jeremy Allison 1998
+ 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
*/
#include "includes.h"
-extern int DEBUGLEVEL;
-extern int Client;
-extern int chain_size;
-extern char *OutBuffer;
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LOCKING
+
+extern int max_send;
/****************************************************************************
This is the structure to queue to implement blocking locks.
notify. It consists of the requesting SMB and the expiry time.
*****************************************************************************/
-typedef struct {
- ubi_slNode msg_next;
- int com_type;
- files_struct *fsp;
- time_t expire_time;
- int lock_num;
- char *inbuf;
- int length;
+typedef struct _blocking_lock_record {
+ struct _blocking_lock_record *next;
+ struct _blocking_lock_record *prev;
+ int com_type;
+ files_struct *fsp;
+ struct timeval expire_time;
+ int lock_num;
+ SMB_BIG_UINT offset;
+ SMB_BIG_UINT count;
+ uint32 lock_pid;
+ enum brl_flavour lock_flav;
+ enum brl_type lock_type;
+ char *inbuf;
+ int length;
} blocking_lock_record;
-static ubi_slList blocking_lock_queue = { NULL, (ubi_slNodePtr)&blocking_lock_queue, 0};
+/* dlink list we store pending lock records on. */
+static blocking_lock_record *blocking_lock_queue;
+
+/* dlink list we move cancelled lock records onto. */
+static blocking_lock_record *blocking_lock_cancelled_queue;
+
+/* The event that makes us process our blocking lock queue */
+static struct timed_event *brl_timeout;
/****************************************************************************
Destructor for the above structure.
static void free_blocking_lock_record(blocking_lock_record *blr)
{
- free(blr->inbuf);
- free((char *)blr);
-}
-
-/****************************************************************************
- Get the files_struct given a particular queued SMB.
-*****************************************************************************/
-
-static files_struct *get_fsp_from_pkt(char *inbuf)
-{
- 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");
- }
- return NULL; /* Keep compiler happy. */
+ SAFE_FREE(blr->inbuf);
+ SAFE_FREE(blr);
}
/****************************************************************************
static BOOL in_chained_smb(void)
{
- return (chain_size != 0);
+ return (chain_size != 0);
}
-/****************************************************************************
- Function to push a blocking lock request onto the lock queue.
-****************************************************************************/
+static void received_unlock_msg(int msg_type, struct server_id src,
+ void *buf, size_t len,
+ void *private_data);
+static void process_blocking_lock_queue(void);
-BOOL push_blocking_lock_request( char *inbuf, int length, int lock_timeout, int lock_num)
+static void brl_timeout_fn(struct event_context *event_ctx,
+ struct timed_event *te,
+ const struct timeval *now,
+ void *private_data)
{
- blocking_lock_record *blr;
-
- if(in_chained_smb() ) {
- DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
- return False;
- }
+ SMB_ASSERT(brl_timeout == te);
+ TALLOC_FREE(brl_timeout);
- /*
- * Now queue an entry on the blocking lock queue. We setup
- * the expiration time here.
- */
+ change_to_root_user(); /* TODO: Possibly run all timed events as
+ * root */
- if((blr = (blocking_lock_record *)malloc(sizeof(blocking_lock_record))) == 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" ));
- free((char *)blr);
- return False;
- }
+ process_blocking_lock_queue();
+}
- 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->lock_num = lock_num;
- memcpy(blr->inbuf, inbuf, length);
- blr->length = length;
+/****************************************************************************
+ After a change to blocking_lock_queue, recalculate the timed_event for the
+ next processing.
+****************************************************************************/
- ubi_slAddTail(&blocking_lock_queue, blr);
+static BOOL recalc_brl_timeout(void)
+{
+ blocking_lock_record *brl;
+ struct timeval next_timeout;
+
+ TALLOC_FREE(brl_timeout);
+
+ next_timeout = timeval_zero();
+
+ for (brl = blocking_lock_queue; brl; brl = brl->next) {
+ if (timeval_is_zero(&brl->expire_time)) {
+ continue;
+ }
+
+ if (timeval_is_zero(&next_timeout)) {
+ next_timeout = brl->expire_time;
+ }
+ else {
+ next_timeout = timeval_min(&next_timeout,
+ &brl->expire_time);
+ }
+ }
+
+ if (timeval_is_zero(&next_timeout)) {
+ return True;
+ }
+
+ if (!(brl_timeout = event_add_timed(smbd_event_context(), NULL,
+ next_timeout, "brl_timeout",
+ brl_timeout_fn, NULL))) {
+ return False;
+ }
+
+ return True;
+}
- DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with expiry time %d \
-for fnum = %d, name = %s\n", length, (int)blr->expire_time,
- blr->fsp->fnum, blr->fsp->fsp_name ));
+/****************************************************************************
+ Function to push a blocking lock request onto the lock queue.
+****************************************************************************/
- return True;
+BOOL push_blocking_lock_request( struct byte_range_lock *br_lck,
+ char *inbuf, int length,
+ files_struct *fsp,
+ int lock_timeout,
+ int lock_num,
+ uint32 lock_pid,
+ enum brl_type lock_type,
+ enum brl_flavour lock_flav,
+ SMB_BIG_UINT offset, SMB_BIG_UINT count)
+{
+ static BOOL set_lock_msg;
+ blocking_lock_record *blr;
+ NTSTATUS status;
+
+ if(in_chained_smb() ) {
+ DEBUG(0,("push_blocking_lock_request: cannot queue a chained request (currently).\n"));
+ return False;
+ }
+
+ /*
+ * Now queue an entry on the blocking lock queue. We setup
+ * the expiration time here.
+ */
+
+ if((blr = SMB_MALLOC_P(blocking_lock_record)) == NULL) {
+ DEBUG(0,("push_blocking_lock_request: Malloc fail !\n" ));
+ return False;
+ }
+
+ blr->next = NULL;
+ blr->prev = NULL;
+
+ if((blr->inbuf = (char *)SMB_MALLOC(length)) == NULL) {
+ DEBUG(0,("push_blocking_lock_request: Malloc fail (2)!\n" ));
+ SAFE_FREE(blr);
+ return False;
+ }
+
+ blr->com_type = CVAL(inbuf,smb_com);
+ 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->lock_flav = lock_flav;
+ blr->lock_type = lock_type;
+ blr->offset = offset;
+ blr->count = count;
+ memcpy(blr->inbuf, inbuf, length);
+ blr->length = length;
+
+ /* Add a pending lock record for this. */
+ 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,
+ lock_timeout ? True : False); /* blocking_lock. */
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0,("push_blocking_lock_request: failed to add PENDING_LOCK record.\n"));
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ return False;
+ }
+
+ DLIST_ADD_END(blocking_lock_queue, blr, 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,
+ NULL);
+ set_lock_msg = True;
+ }
+
+ DEBUG(3,("push_blocking_lock_request: lock request length=%d blocked with "
+ "expiry time (%u sec. %u usec) (+%d msec) for fnum = %d, name = %s\n",
+ length, (unsigned int)blr->expire_time.tv_sec,
+ (unsigned int)blr->expire_time.tv_usec, 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));
+
+ return True;
}
/****************************************************************************
Return a smd with a given size.
*****************************************************************************/
-static void send_blocking_reply(char *outbuf, int outsize)
+static void send_blocking_reply(char *outbuf, int outsize, const char *inbuf)
{
- if(outsize > 4)
- smb_setlen(outbuf,outsize - 4);
+ if(outsize > 4) {
+ smb_setlen(inbuf, outbuf,outsize - 4);
+ }
- send_smb(Client,outbuf);
+ if (!send_smb(smbd_server_fd(),outbuf)) {
+ exit_server_cleanly("send_blocking_reply: send_smb failed.");
+ }
}
/****************************************************************************
static void reply_lockingX_success(blocking_lock_record *blr)
{
- char *outbuf = OutBuffer;
- int bufsize = BUFFER_SIZE;
- char *inbuf = blr->inbuf;
- int outsize = 0;
+ char *outbuf = get_OutBuffer();
+ int bufsize = BUFFER_SIZE;
+ char *inbuf = blr->inbuf;
+ int outsize = 0;
- construct_reply_common(inbuf, outbuf);
- set_message(outbuf,2,0,True);
+ construct_reply_common(inbuf, outbuf);
+ set_message(inbuf,outbuf,2,0,True);
- /*
- * As this message is a lockingX call we must handle
- * any following chained message correctly.
- * This is normally handled in construct_reply(),
- * but as that calls switch_message, we can't use
- * that here and must set up the chain info manually.
- */
+ /*
+ * As this message is a lockingX call we must handle
+ * any following chained message correctly.
+ * This is normally handled in construct_reply(),
+ * but as that calls switch_message, we can't use
+ * that here and must set up the chain info manually.
+ */
- outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
+ outsize = chain_reply(inbuf,outbuf,blr->length,bufsize);
- outsize += chain_size;
+ outsize += chain_size;
- send_blocking_reply(outbuf,outsize);
+ send_blocking_reply(outbuf,outsize,inbuf);
}
/****************************************************************************
Return a generic lock fail error blocking call.
*****************************************************************************/
-static void generic_blocking_lock_error(blocking_lock_record *blr, int eclass, int32 ecode)
+static void generic_blocking_lock_error(blocking_lock_record *blr, NTSTATUS status)
{
- char *outbuf = OutBuffer;
- char *inbuf = blr->inbuf;
- construct_reply_common(inbuf, outbuf);
-
- if(eclass == 0) /* NT Error. */
- SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2) | FLAGS2_32_BIT_ERROR_CODES);
-
- ERROR(eclass,ecode);
- send_smb(Client,outbuf);
+ char *outbuf = get_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;
+ }
+
+ if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_LOCK_CONFLICT)) {
+ /* Store the last lock error. */
+ files_struct *fsp = blr->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;
+ }
+
+ ERROR_NT(status);
+ if (!send_smb(smbd_server_fd(),outbuf)) {
+ exit_server_cleanly("generic_blocking_lock_error: send_smb failed.");
+ }
}
/****************************************************************************
obtained first.
*****************************************************************************/
-static void reply_lockingX_error(blocking_lock_record *blr, int eclass, int32 ecode)
+static void reply_lockingX_error(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_OFF_T count, offset;
- unsigned char locktype = CVAL(inbuf,smb_vwv3);
- BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
- char *data;
- int i;
-
- data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
-
- /*
- * Data now points at the beginning of the list
- * of smb_lkrng structs.
- */
-
- for(i = blr->lock_num; i >= 0; i--) {
- int dummy1;
- uint32 dummy2;
- if(!large_file_format) {
- count = IVAL(data,SMB_LKLEN_OFFSET(i));
- offset = IVAL(data,SMB_LKOFF_OFFSET(i));
- }
-#ifdef LARGE_SMB_OFF_T
- else {
- count = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_HIGH(i))) << 32) |
- ((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_LOW(i)));
- offset = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_HIGH(i))) << 32) |
- ((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_LOW(i)));
- }
-#endif
- do_unlock(fsp,conn,count,offset,&dummy1,&dummy2);
- }
-
- generic_blocking_lock_error(blr, eclass, ecode);
+ char *inbuf = blr->inbuf;
+ files_struct *fsp = blr->fsp;
+ uint16 num_ulocks = SVAL(inbuf,smb_vwv6);
+ SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT) 0;
+ uint32 lock_pid;
+ unsigned char locktype = CVAL(inbuf,smb_vwv3);
+ BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
+ char *data;
+ int i;
+
+ data = smb_buf(inbuf) + ((large_file_format ? 20 : 10)*num_ulocks);
+
+ /*
+ * Data now points at the beginning of the list
+ * of smb_lkrng structs.
+ */
+
+ /*
+ * Ensure we don't do a remove on the lock that just failed,
+ * 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;
+
+ 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(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, int eclass, int32 ecode)
+static void blocking_lock_reply_error(blocking_lock_record *blr, NTSTATUS status)
{
- switch(blr->com_type) {
- case SMBlock:
- generic_blocking_lock_error(blr, eclass, ecode);
- break;
- case SMBlockread:
- generic_blocking_lock_error(blr, eclass, ecode);
- break;
- case SMBlockingX:
- reply_lockingX_error(blr, eclass, ecode);
- 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");
- }
+ switch(blr->com_type) {
+ case SMBlockingX:
+ reply_lockingX_error(blr, status);
+ break;
+ case SMBtrans2:
+ case SMBtranss2:
+ {
+ char *outbuf = get_OutBuffer();
+ char *inbuf = blr->inbuf;
+ construct_reply_common(inbuf, outbuf);
+ /* construct_reply_common has done us the favor to pre-fill the
+ * command field with SMBtranss2 which is wrong :-)
+ */
+ SCVAL(outbuf,smb_com,SMBtrans2);
+ ERROR_NT(status);
+ if (!send_smb(smbd_server_fd(),outbuf)) {
+ exit_server_cleanly("blocking_lock_reply_error: send_smb failed.");
+ }
+ 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.
+ Attempt to finish off getting all pending blocking locks for a lockingX call.
Returns True if we want to be removed from the list.
*****************************************************************************/
-static BOOL process_lockread(blocking_lock_record *blr)
+static BOOL process_lockingX(blocking_lock_record *blr)
{
- char *outbuf = OutBuffer;
- char *inbuf = blr->inbuf;
- ssize_t nread = -1;
- char *data;
- int outsize = 0;
- SMB_OFF_T startpos;
- size_t numtoread;
- int eclass;
- uint32 ecode;
- connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
- files_struct *fsp = blr->fsp;
-
- numtoread = SVAL(inbuf,smb_vwv1);
- startpos = IVAL(inbuf,smb_vwv2);
-
- numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
- data = smb_buf(outbuf) + 3;
-
- if(!do_lock( fsp, conn, numtoread, startpos, F_RDLCK, &eclass, &ecode)) {
- if((errno != EACCES) && (errno != EAGAIN)) {
- /*
- * We have other than a "can't get lock" POSIX
- * error. Send an error.
- * Return True so we get dequeued.
- */
-
- generic_blocking_lock_error(blr, eclass, ecode);
- return True;
- }
-
- /*
- * Still waiting for lock....
- */
-
- 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,ERRDOS,ERRnoaccess);
- return True;
- }
-
- construct_reply_common(inbuf, outbuf);
- outsize = set_message(outbuf,5,3,True);
-
- outsize += nread;
- SSVAL(outbuf,smb_vwv0,nread);
- SSVAL(outbuf,smb_vwv5,nread+3);
- SSVAL(smb_buf(outbuf),1,nread);
-
- DEBUG(3, ( "process_lockread file = %s, fnum=%d num=%d nread=%d\n",
- fsp->fsp_name, fsp->fnum, numtoread, nread ) );
-
- send_blocking_reply(outbuf,outsize);
- return True;
+ char *inbuf = blr->inbuf;
+ unsigned char locktype = CVAL(inbuf,smb_vwv3);
+ files_struct *fsp = blr->fsp;
+ 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;
+ uint32 lock_pid;
+ BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
+ char *data;
+ NTSTATUS status = NT_STATUS_OK;
+
+ data = smb_buf(inbuf) + ((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++) {
+ 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;
+ 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);
+
+ 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) );
+
+ 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.
+ */
+
+ 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));
+
+ return False;
}
/****************************************************************************
- Attempt to finish off getting all pending blocking locks for a lock call.
+ 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_lock(blocking_lock_record *blr)
+static BOOL process_trans2(blocking_lock_record *blr)
{
- char *outbuf = OutBuffer;
- char *inbuf = blr->inbuf;
- int outsize;
- SMB_OFF_T count,offset;
- int eclass;
- uint32 ecode;
- connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
- files_struct *fsp = blr->fsp;
-
- count = IVAL(inbuf,smb_vwv1);
- offset = IVAL(inbuf,smb_vwv3);
-
- errno = 0;
- if (!do_lock(fsp, conn, count, offset, F_WRLCK, &eclass, &ecode)) {
- if((errno != EACCES) && (errno != EAGAIN)) {
-
- /*
- * We have other than a "can't get lock" POSIX
- * error. Send an error.
- * Return True so we get dequeued.
- */
-
- blocking_lock_reply_error(blr, eclass, ecode);
- return True;
- }
-
- /*
- * 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;
- }
-
- /*
- * 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;
+ char *inbuf = blr->inbuf;
+ char *outbuf;
+ 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);
+ 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. */
+ outbuf = get_OutBuffer();
+ construct_reply_common(inbuf, outbuf);
+ SCVAL(outbuf,smb_com,SMBtrans2);
+ SSVAL(params,0,0);
+ /* Fake up max_data_bytes here - we know it fits. */
+ send_trans2_replies(inbuf, outbuf, max_send, params, 2, NULL, 0, 0xffff);
+ return True;
}
-/****************************************************************************
- Attempt to finish off getting all pending blocking locks for a lockingX call.
- Returns True if we want to be removed from the list.
-*****************************************************************************/
-
-static BOOL process_lockingX(blocking_lock_record *blr)
-{
- char *inbuf = blr->inbuf;
- unsigned char locktype = CVAL(inbuf,smb_vwv3);
- 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_OFF_T count, offset;
- BOOL large_file_format = (locktype & LOCKING_ANDX_LARGE_FILES);
- char *data;
- int eclass=0;
- uint32 ecode=0;
-
- data = smb_buf(inbuf) + ((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++) {
- if(!large_file_format) {
- count = IVAL(data,SMB_LKLEN_OFFSET(blr->lock_num));
- offset = IVAL(data,SMB_LKOFF_OFFSET(blr->lock_num));
- }
-#ifdef LARGE_SMB_OFF_T
- else {
- count = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_HIGH(blr->lock_num))) << 32) |
- ((SMB_OFF_T) IVAL(data,SMB_LARGE_LKLEN_OFFSET_LOW(blr->lock_num)));
- offset = (((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_HIGH(blr->lock_num))) << 32) |
- ((SMB_OFF_T) IVAL(data,SMB_LARGE_LKOFF_OFFSET_LOW(blr->lock_num)));
- }
-#endif
- errno = 0;
- if(!do_lock(fsp,conn,count,offset, ((locktype & 1) ? F_RDLCK : F_WRLCK),
- &eclass, &ecode))
- 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) );
-
- reply_lockingX_success(blr);
- return True;
-
- } else if((errno != EACCES) && (errno != EAGAIN)) {
-
- /*
- * We have other than a "can't get lock" POSIX
- * error. Free any locks we had and return an error.
- * Return True so we get dequeued.
- */
-
- blocking_lock_reply_error(blr, eclass, ecode);
- 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));
-
- return False;
-}
/****************************************************************************
Process a blocking lock SMB.
static BOOL blocking_lock_record_process(blocking_lock_record *blr)
{
- switch(blr->com_type) {
- case SMBlock:
- return process_lock(blr);
- case SMBlockread:
- return process_lockread(blr);
- case SMBlockingX:
- return process_lockingX(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");
- }
- return False; /* Keep compiler happy. */
+ switch(blr->com_type) {
+ 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");
+ }
+ return False; /* Keep compiler happy. */
}
/****************************************************************************
- 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 = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
- blocking_lock_record *prev = NULL;
+ blocking_lock_record *blr, *next = NULL;
- while(blr != NULL) {
- if(blr->fsp->fnum == fsp->fnum) {
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(blr->fsp->fnum == fsp->fnum) {
+ unsigned char locktype = 0;
- 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 ));
+ if (blr->com_type == SMBlockingX) {
+ locktype = CVAL(blr->inbuf,smb_vwv3);
+ }
- free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
- blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
- continue;
- }
+ if (br_lck) {
+ 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 ));
- prev = blr;
- blr = (blocking_lock_record *)ubi_slNext(blr);
- }
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+
+ blocking_lock_cancel(fsp,
+ blr->lock_pid,
+ blr->offset,
+ blr->count,
+ blr->lock_flav,
+ locktype,
+ NT_STATUS_RANGE_NOT_LOCKED);
+ }
+ }
+ }
}
/****************************************************************************
void remove_pending_lock_requests_by_mid(int mid)
{
- blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
- blocking_lock_record *prev = NULL;
+ blocking_lock_record *blr, *next = NULL;
- while(blr != NULL) {
- if(SVAL(blr->inbuf,smb_mid) == mid) {
- files_struct *fsp = blr->fsp;
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(SVAL(blr->inbuf,smb_mid) == mid) {
+ files_struct *fsp = blr->fsp;
+ struct byte_range_lock *br_lck = brl_get_locks(NULL, fsp);
- DEBUG(10,("remove_pending_lock_requests_by_mid - removing request type %d for \
+ if (br_lck) {
+ 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 ));
- blocking_lock_reply_error(blr,0,NT_STATUS_CANCELLED);
- free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
- blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
- continue;
- }
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ }
+ }
+}
- prev = blr;
- blr = (blocking_lock_record *)ubi_slNext(blr);
- }
+/****************************************************************************
+ Is this mid a blocking lock request on the queue ?
+*****************************************************************************/
+
+BOOL blocking_lock_was_deferred(int mid)
+{
+ blocking_lock_record *blr, *next = NULL;
+
+ for(blr = blocking_lock_queue; blr; blr = next) {
+ next = blr->next;
+ if(SVAL(blr->inbuf,smb_mid) == mid) {
+ return True;
+ }
+ }
+ return False;
+}
+
+/****************************************************************************
+ Set a flag as an unlock request affects one of our pending locks.
+*****************************************************************************/
+
+static void received_unlock_msg(int msg_type, struct server_id src,
+ void *buf, size_t len,
+ void *private_data)
+{
+ 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)
+static void process_blocking_lock_queue(void)
+{
+ struct timeval tv_curr = timeval_current();
+ blocking_lock_record *blr, *next = NULL;
+ BOOL recalc_timeout = False;
+
+ /*
+ * 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....
+ */
+ 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);
+
+ DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
+ fsp->fnum, fsp->fsp_name ));
+
+ if (!timeval_is_zero(&blr->expire_time) && timeval_compare(&blr->expire_time, &tv_curr) <= 0) {
+ struct byte_range_lock *br_lck = brl_get_locks(NULL, fsp);
+
+ /*
+ * Lock expired - throw away all previously
+ * obtained locks and return lock error.
+ */
+
+ if (br_lck) {
+ DEBUG(5,("process_blocking_lock_queue: pending lock fnum = %d for file %s timed out.\n",
+ fsp->fnum, fsp->fsp_name ));
+
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ blocking_lock_reply_error(blr,NT_STATUS_FILE_LOCK_CONFLICT);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ continue;
+ }
+
+ if(!change_to_user(conn,vuid)) {
+ struct byte_range_lock *br_lck = brl_get_locks(NULL, fsp);
+
+ /*
+ * Remove the entry and return an error to the client.
+ */
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ DEBUG(0,("process_blocking_lock_queue: Unable to become user vuid=%d.\n",
+ vuid ));
+ blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ continue;
+ }
+
+ if(!set_current_service(conn,SVAL(blr->inbuf,smb_flg),True)) {
+ struct byte_range_lock *br_lck = brl_get_locks(NULL, fsp);
+
+ /*
+ * Remove the entry and return an error to the client.
+ */
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ DEBUG(0,("process_blocking_lock_queue: Unable to become service Error was %s.\n", strerror(errno) ));
+ blocking_lock_reply_error(blr,NT_STATUS_ACCESS_DENIED);
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ change_to_root_user();
+ continue;
+ }
+
+ /*
+ * 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.
+ */
+
+ if(blocking_lock_record_process(blr)) {
+ struct byte_range_lock *br_lck = brl_get_locks(NULL, fsp);
+
+ if (br_lck) {
+ brl_lock_cancel(br_lck,
+ blr->lock_pid,
+ procid_self(),
+ blr->offset,
+ blr->count,
+ blr->lock_flav);
+ TALLOC_FREE(br_lck);
+ }
+
+ DLIST_REMOVE(blocking_lock_queue, blr);
+ free_blocking_lock_record(blr);
+ recalc_timeout = True;
+ }
+ change_to_root_user();
+ }
+
+ if (recalc_timeout) {
+ recalc_brl_timeout();
+ }
+}
+
+/****************************************************************************
+ Handle a cancel message. Lock already moved onto the cancel queue.
+*****************************************************************************/
+
+#define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(blocking_lock_record *) + sizeof(NTSTATUS))
+
+static void process_blocking_lock_cancel_message(int msg_type,
+ struct server_id src,
+ void *buf, size_t len,
+ void *private_data)
+{
+ NTSTATUS err;
+ const char *msg = (const char *)buf;
+ blocking_lock_record *blr;
+
+ if (buf == NULL) {
+ smb_panic("process_blocking_lock_cancel_message: null msg\n");
+ }
+
+ if (len != MSG_BLOCKING_LOCK_CANCEL_SIZE) {
+ DEBUG(0, ("process_blocking_lock_cancel_message: "
+ "Got invalid msg len %d\n", (int)len));
+ smb_panic("process_blocking_lock_cancel_message: bad msg\n");
+ }
+
+ memcpy(&blr, msg, sizeof(blr));
+ memcpy(&err, &msg[sizeof(blr)], sizeof(NTSTATUS));
+
+ DEBUG(10,("process_blocking_lock_cancel_message: returning error %s\n",
+ nt_errstr(err) ));
+
+ blocking_lock_reply_error(blr, err);
+ DLIST_REMOVE(blocking_lock_cancelled_queue, blr);
+ free_blocking_lock_record(blr);
+}
+
+/****************************************************************************
+ Send ourselves a blocking lock cancelled message. Handled asynchronously above.
+*****************************************************************************/
+
+BOOL blocking_lock_cancel(files_struct *fsp,
+ uint32 lock_pid,
+ SMB_BIG_UINT offset,
+ SMB_BIG_UINT count,
+ enum brl_flavour lock_flav,
+ unsigned char locktype,
+ NTSTATUS err)
{
- blocking_lock_record *blr = (blocking_lock_record *)ubi_slFirst( &blocking_lock_queue );
- blocking_lock_record *prev = NULL;
-
- if(blr == NULL)
- return;
-
- /*
- * Go through the queue and see if we can get any of the locks.
- */
-
- while(blr != NULL) {
- connection_struct *conn = NULL;
- uint16 vuid;
- files_struct *fsp = NULL;
-
- /*
- * Ensure we don't have any old chain_fsp values
- * sitting around....
- */
- 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);
-
- DEBUG(5,("process_blocking_lock_queue: examining pending lock fnum = %d for file %s\n",
- fsp->fnum, fsp->fsp_name ));
-
- 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 ));
-
- blocking_lock_reply_error(blr,ERRSRV,ERRaccess);
- free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
- blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
- continue;
- }
-
- if(!become_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,ERRSRV,ERRaccess);
- free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
- blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
- continue;
- }
-
- if(!become_service(conn,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,ERRSRV,ERRaccess);
- free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
- blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
- unbecome_user();
- continue;
- }
-
- /*
- * 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.
- */
-
- if(blocking_lock_record_process(blr)) {
- free_blocking_lock_record((blocking_lock_record *)ubi_slRemNext( &blocking_lock_queue, prev));
- blr = (blocking_lock_record *)(prev ? ubi_slNext(prev) : ubi_slFirst(&blocking_lock_queue));
- unbecome_user();
- continue;
- }
-
- unbecome_user();
-
- /*
- * Move to the next in the list.
- */
- prev = blr;
- blr = (blocking_lock_record *)ubi_slNext(blr);
- }
+ static BOOL initialized;
+ char msg[MSG_BLOCKING_LOCK_CANCEL_SIZE];
+ blocking_lock_record *blr;
+
+ if (!initialized) {
+ /* Register our message. */
+ message_register(MSG_SMB_BLOCKING_LOCK_CANCEL,
+ process_blocking_lock_cancel_message,
+ NULL);
+
+ initialized = 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;
+ }
+ }
+
+ if (!blr) {
+ return False;
+ }
+
+ /* Check the flags are right. */
+ if (blr->com_type == SMBlockingX &&
+ (locktype & LOCKING_ANDX_LARGE_FILES) !=
+ (CVAL(blr->inbuf,smb_vwv3) & LOCKING_ANDX_LARGE_FILES)) {
+ return False;
+ }
+
+ /* 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));
+
+ message_send_pid(pid_to_procid(sys_getpid()),
+ MSG_SMB_BLOCKING_LOCK_CANCEL,
+ &msg, sizeof(msg), True);
+
+ return True;
}
git.samba.org / sfrench / samba-autobuild / .git / blobdiff