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/*
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Unix SMB / CIFS implementation .
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Blocking Locking functions
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Copyright ( C ) Jeremy Allison 1998 - 2003
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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
( 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 0213 9 , USA .
*/
# include "includes.h"
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# undef DBGC_CLASS
# define DBGC_CLASS DBGC_LOCKING
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extern int max_send ;
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/****************************************************************************
This is the structure to queue to implement blocking locks .
notify . It consists of the requesting SMB and the expiry time .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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typedef struct _blocking_lock_record {
struct _blocking_lock_record * next ;
struct _blocking_lock_record * prev ;
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int com_type ;
files_struct * fsp ;
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struct timeval expire_time ;
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int lock_num ;
SMB_BIG_UINT offset ;
SMB_BIG_UINT count ;
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uint32 lock_pid ;
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enum brl_flavour lock_flav ;
enum brl_type lock_type ;
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char * inbuf ;
int length ;
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} blocking_lock_record ;
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/* dlink list we store pending lock records on. */
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static blocking_lock_record * blocking_lock_queue ;
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/* dlink list we move cancelled lock records onto. */
static blocking_lock_record * blocking_lock_cancelled_queue ;
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/****************************************************************************
Destructor for the above structure .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static void free_blocking_lock_record ( blocking_lock_record * blr )
{
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SAFE_FREE ( blr - > inbuf ) ;
SAFE_FREE ( blr ) ;
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}
/****************************************************************************
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Determine if this is a secondary element of a chained SMB .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static BOOL in_chained_smb ( void )
{
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return ( chain_size ! = 0 ) ;
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}
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static void received_unlock_msg ( int msg_type , struct process_id src ,
r21064: The core of this patch is
void message_register(int msg_type,
void (*fn)(int msg_type, struct process_id pid,
- void *buf, size_t len))
+ void *buf, size_t len,
+ void *private_data),
+ void *private_data)
{
struct dispatch_fns *dfn;
So this adds a (so far unused) private pointer that is passed from
message_register to the message handler. A prerequisite to implement a tiny
samba4-API compatible wrapper around our messaging system. That itself is
necessary for the Samba4 notify system.
Yes, I know, I could import the whole Samba4 messaging system, but I want to
do it step by step and I think getting notify in is more important in this
step.
Volker
(This used to be commit c8ae60ed65dcce9660ee39c75488f2838cf9a28b)
2007-01-31 01:22:06 +03:00
void * buf , size_t len ,
void * private_data ) ;
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/****************************************************************************
Function to push a blocking lock request onto the lock queue .
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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BOOL push_blocking_lock_request ( struct byte_range_lock * br_lck ,
char * inbuf , int length ,
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files_struct * fsp ,
int lock_timeout ,
int lock_num ,
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uint32 lock_pid ,
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enum brl_type lock_type ,
enum brl_flavour lock_flav ,
SMB_BIG_UINT offset , SMB_BIG_UINT count )
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{
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static BOOL set_lock_msg ;
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blocking_lock_record * blr ;
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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 .
*/
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if ( ( blr = SMB_MALLOC_P ( blocking_lock_record ) ) = = NULL ) {
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DEBUG ( 0 , ( " push_blocking_lock_request: Malloc fail ! \n " ) ) ;
return False ;
}
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blr - > next = NULL ;
blr - > prev = NULL ;
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if ( ( blr - > inbuf = ( char * ) SMB_MALLOC ( length ) ) = = NULL ) {
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DEBUG ( 0 , ( " push_blocking_lock_request: Malloc fail (2)! \n " ) ) ;
SAFE_FREE ( blr ) ;
return False ;
}
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blr - > com_type = CVAL ( inbuf , smb_com ) ;
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blr - > fsp = fsp ;
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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 ) ;
}
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blr - > lock_num = lock_num ;
blr - > lock_pid = lock_pid ;
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blr - > lock_flav = lock_flav ;
blr - > lock_type = lock_type ;
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blr - > offset = offset ;
blr - > count = count ;
memcpy ( blr - > inbuf , inbuf , length ) ;
blr - > length = length ;
/* Add a pending lock record for this. */
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status = brl_lock ( br_lck ,
lock_pid ,
procid_self ( ) ,
offset ,
count ,
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lock_type = = READ_LOCK ? PENDING_READ_LOCK : PENDING_WRITE_LOCK ,
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blr - > lock_flav ,
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lock_timeout ? True : False ) ; /* blocking_lock. */
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if ( ! NT_STATUS_IS_OK ( status ) ) {
DEBUG ( 0 , ( " push_blocking_lock_request: failed to add PENDING_LOCK record. \n " ) ) ;
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DLIST_REMOVE ( blocking_lock_queue , blr ) ;
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free_blocking_lock_record ( blr ) ;
return False ;
}
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DLIST_ADD_END ( blocking_lock_queue , blr , blocking_lock_record * ) ;
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/* Ensure we'll receive messages when this is unlocked. */
if ( ! set_lock_msg ) {
r21064: The core of this patch is
void message_register(int msg_type,
void (*fn)(int msg_type, struct process_id pid,
- void *buf, size_t len))
+ void *buf, size_t len,
+ void *private_data),
+ void *private_data)
{
struct dispatch_fns *dfn;
So this adds a (so far unused) private pointer that is passed from
message_register to the message handler. A prerequisite to implement a tiny
samba4-API compatible wrapper around our messaging system. That itself is
necessary for the Samba4 notify system.
Yes, I know, I could import the whole Samba4 messaging system, but I want to
do it step by step and I think getting notify in is more important in this
step.
Volker
(This used to be commit c8ae60ed65dcce9660ee39c75488f2838cf9a28b)
2007-01-31 01:22:06 +03:00
message_register ( MSG_SMB_UNLOCK , received_unlock_msg ,
NULL ) ;
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set_lock_msg = True ;
}
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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 ,
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blr - > fsp - > fnum , blr - > fsp - > fsp_name ) ) ;
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/* Push the MID of this packet on the signing queue. */
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srv_defer_sign_response ( SVAL ( inbuf , smb_mid ) ) ;
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return True ;
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}
/****************************************************************************
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Return a smd with a given size .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static void send_blocking_reply ( char * outbuf , int outsize )
{
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if ( outsize > 4 )
smb_setlen ( outbuf , outsize - 4 ) ;
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if ( ! send_smb ( smbd_server_fd ( ) , outbuf ) )
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exit_server_cleanly ( " send_blocking_reply: send_smb failed. " ) ;
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}
/****************************************************************************
Return a lockingX success SMB .
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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static void reply_lockingX_success ( blocking_lock_record * blr )
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{
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char * outbuf = get_OutBuffer ( ) ;
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int bufsize = BUFFER_SIZE ;
char * inbuf = blr - > inbuf ;
int outsize = 0 ;
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construct_reply_common ( inbuf , outbuf ) ;
set_message ( outbuf , 2 , 0 , True ) ;
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/*
* 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 .
*/
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outsize = chain_reply ( inbuf , outbuf , blr - > length , bufsize ) ;
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outsize + = chain_size ;
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send_blocking_reply ( outbuf , outsize ) ;
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}
/****************************************************************************
Return a generic lock fail error blocking call .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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static void generic_blocking_lock_error ( blocking_lock_record * blr , NTSTATUS status )
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{
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char * outbuf = get_OutBuffer ( ) ;
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char * inbuf = blr - > inbuf ;
construct_reply_common ( inbuf , outbuf ) ;
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/* 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 ;
}
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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 ;
}
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ERROR_NT ( status ) ;
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if ( ! send_smb ( smbd_server_fd ( ) , outbuf ) ) {
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exit_server_cleanly ( " generic_blocking_lock_error: send_smb failed. " ) ;
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}
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}
/****************************************************************************
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Return a lock fail error for a lockingX call . Undo all the locks we have
obtained first .
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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static void reply_lockingX_error ( blocking_lock_record * blr , NTSTATUS status )
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{
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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 ;
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uint32 lock_pid ;
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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 .
*/
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do_unlock ( fsp ,
lock_pid ,
count ,
offset ,
WINDOWS_LOCK ) ;
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}
generic_blocking_lock_error ( blr , status ) ;
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}
/****************************************************************************
Return a lock fail error .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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static void blocking_lock_reply_error ( blocking_lock_record * blr , NTSTATUS status )
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{
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switch ( blr - > com_type ) {
case SMBlockingX :
reply_lockingX_error ( blr , status ) ;
break ;
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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 ) ) {
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exit_server_cleanly ( " blocking_lock_reply_error: send_smb failed. " ) ;
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}
break ;
}
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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 " ) ;
}
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}
/****************************************************************************
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 )
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{
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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 ;
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uint32 lock_pid ;
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BOOL large_file_format = ( locktype & LOCKING_ANDX_LARGE_FILES ) ;
char * data ;
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NTSTATUS status = NT_STATUS_OK ;
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data = smb_buf ( inbuf ) + ( ( large_file_format ? 20 : 10 ) * num_ulocks ) ;
/*
* Data now points at the beginning of the list
* of smb_lkrng structs .
*/
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for ( ; blr - > lock_num < num_locks ; blr - > lock_num + + ) {
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struct byte_range_lock * br_lck = NULL ;
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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 ;
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br_lck = do_lock ( fsp ,
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lock_pid ,
count ,
offset ,
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( ( locktype & LOCKING_ANDX_SHARED_LOCK ) ?
READ_LOCK : WRITE_LOCK ) ,
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WINDOWS_LOCK ,
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True ,
& status ) ;
TALLOC_FREE ( br_lck ) ;
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if ( NT_STATUS_IS_ERR ( status ) ) {
break ;
}
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}
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 ;
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} 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 .
*/
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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 ;
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}
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/****************************************************************************
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 ( blocking_lock_record * blr )
{
char * inbuf = blr - > inbuf ;
char * outbuf ;
char params [ 2 ] ;
NTSTATUS status ;
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struct byte_range_lock * br_lck = do_lock ( blr - > fsp ,
blr - > lock_pid ,
blr - > count ,
blr - > offset ,
blr - > lock_type ,
blr - > lock_flav ,
True ,
& status ) ;
TALLOC_FREE ( br_lck ) ;
2006-04-10 19:33:04 +04:00
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 ) ;
2006-08-14 20:53:14 +04:00
/* Fake up max_data_bytes here - we know it fits. */
send_trans2_replies ( outbuf , max_send , params , 2 , NULL , 0 , 0xffff ) ;
2006-04-10 19:33:04 +04:00
return True ;
}
1998-08-20 23:28:37 +04:00
/****************************************************************************
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 )
{
2003-07-24 10:56:56 +04:00
switch ( blr - > com_type ) {
case SMBlockingX :
return process_lockingX ( blr ) ;
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case SMBtrans2 :
case SMBtranss2 :
return process_trans2 ( blr ) ;
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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. */
1998-08-20 23:28:37 +04:00
}
1998-08-19 05:49:57 +04:00
/****************************************************************************
2006-07-18 01:09:02 +04:00
Cancel entries by fnum from the blocking lock pending queue .
1998-08-19 05:49:57 +04:00
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2006-07-18 01:09:02 +04:00
void cancel_pending_lock_requests_by_fid ( files_struct * fsp , struct byte_range_lock * br_lck )
1998-08-19 05:49:57 +04:00
{
2004-08-21 04:43:21 +04:00
blocking_lock_record * blr , * next = NULL ;
1998-08-19 05:49:57 +04:00
2004-08-21 04:43:21 +04:00
for ( blr = blocking_lock_queue ; blr ; blr = next ) {
next = blr - > next ;
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if ( blr - > fsp - > fnum = = fsp - > fnum ) {
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unsigned char locktype = 0 ;
if ( blr - > com_type = = SMBlockingX ) {
locktype = CVAL ( blr - > inbuf , smb_vwv3 ) ;
}
1998-08-21 05:30:29 +04:00
2006-04-10 19:33:04 +04:00
if ( br_lck ) {
DEBUG ( 10 , ( " remove_pending_lock_requests_by_fid - removing request type %d for \
1998-08-21 05:30:29 +04:00
file % s fnum = % d \ n " , blr->com_type, fsp->fsp_name, fsp->fnum ));
1998-08-19 05:49:57 +04:00
2006-07-18 01:09:02 +04:00
brl_lock_cancel ( br_lck ,
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blr - > lock_pid ,
procid_self ( ) ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ) ;
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blocking_lock_cancel ( fsp ,
blr - > lock_pid ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ,
locktype ,
NT_STATUS_RANGE_NOT_LOCKED ) ;
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}
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}
}
1998-08-19 05:49:57 +04:00
}
/****************************************************************************
Delete entries by mid from the blocking lock pending queue . Always send reply .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void remove_pending_lock_requests_by_mid ( int mid )
{
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blocking_lock_record * blr , * next = NULL ;
1998-08-19 05:49:57 +04:00
2004-08-21 04:43:21 +04:00
for ( blr = blocking_lock_queue ; blr ; blr = next ) {
next = blr - > next ;
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if ( SVAL ( blr - > inbuf , smb_mid ) = = mid ) {
files_struct * fsp = blr - > fsp ;
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struct byte_range_lock * br_lck = brl_get_locks ( NULL , fsp ) ;
1998-08-21 05:30:29 +04:00
2006-04-10 19:33:04 +04:00
if ( br_lck ) {
DEBUG ( 10 , ( " remove_pending_lock_requests_by_mid - removing request type %d for \
1998-08-21 05:30:29 +04:00
file % s fnum = % d \ n " , blr->com_type, fsp->fsp_name, fsp->fnum ));
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brl_lock_cancel ( br_lck ,
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blr - > lock_pid ,
procid_self ( ) ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ) ;
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TALLOC_FREE ( br_lck ) ;
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}
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blocking_lock_reply_error ( blr , NT_STATUS_FILE_LOCK_CONFLICT ) ;
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DLIST_REMOVE ( blocking_lock_queue , blr ) ;
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free_blocking_lock_record ( blr ) ;
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}
}
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}
2007-01-30 23:49:37 +03:00
/****************************************************************************
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 ;
}
2003-02-27 04:04:34 +03:00
/****************************************************************************
Set a flag as an unlock request affects one of our pending locks .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2005-09-30 21:13:37 +04:00
static void received_unlock_msg ( int msg_type , struct process_id src ,
r21064: The core of this patch is
void message_register(int msg_type,
void (*fn)(int msg_type, struct process_id pid,
- void *buf, size_t len))
+ void *buf, size_t len,
+ void *private_data),
+ void *private_data)
{
struct dispatch_fns *dfn;
So this adds a (so far unused) private pointer that is passed from
message_register to the message handler. A prerequisite to implement a tiny
samba4-API compatible wrapper around our messaging system. That itself is
necessary for the Samba4 notify system.
Yes, I know, I could import the whole Samba4 messaging system, but I want to
do it step by step and I think getting notify in is more important in this
step.
Volker
(This used to be commit c8ae60ed65dcce9660ee39c75488f2838cf9a28b)
2007-01-31 01:22:06 +03:00
void * buf , size_t len ,
void * private_data )
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{
DEBUG ( 10 , ( " received_unlock_msg \n " ) ) ;
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process_blocking_lock_queue ( ) ;
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}
1999-12-13 16:27:58 +03:00
/****************************************************************************
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Return the number of milliseconds to the next blocking locks timeout , or default_timeout
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2003-02-27 04:04:34 +03:00
2006-07-18 05:05:51 +04:00
unsigned int blocking_locks_timeout_ms ( unsigned int default_timeout_ms )
1999-12-13 16:27:58 +03:00
{
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unsigned int timeout_ms = default_timeout_ms ;
struct timeval tv_curr ;
SMB_BIG_INT min_tv_dif_us = 0x7FFFFFFF ; /* A large +ve number. */
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blocking_lock_record * blr = blocking_lock_queue ;
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/* note that we avoid the GetTimeOfDay() syscall if there are no blocking locks */
if ( ! blr ) {
return timeout_ms ;
}
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tv_curr = timeval_current ( ) ;
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for ( ; blr ; blr = blr - > next ) {
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SMB_BIG_INT tv_dif_us ;
if ( timeval_is_zero ( & blr - > expire_time ) ) {
continue ; /* Never timeout. */
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}
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tv_dif_us = usec_time_diff ( & blr - > expire_time , & tv_curr ) ;
min_tv_dif_us = MIN ( min_tv_dif_us , tv_dif_us ) ;
}
if ( min_tv_dif_us < 0 ) {
min_tv_dif_us = 0 ;
}
timeout_ms = ( unsigned int ) ( min_tv_dif_us / ( SMB_BIG_INT ) 1000 ) ;
if ( timeout_ms < 1 ) {
timeout_ms = 1 ;
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}
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DEBUG ( 10 , ( " blocking_locks_timeout_ms: returning %u \n " , timeout_ms ) ) ;
2002-09-25 19:19:00 +04:00
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return timeout_ms ;
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}
1998-08-19 05:49:57 +04:00
/****************************************************************************
Process the blocking lock queue . Note that this is only called as root .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2006-07-18 05:05:51 +04:00
void process_blocking_lock_queue ( void )
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{
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struct timeval tv_curr = timeval_current ( ) ;
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blocking_lock_record * blr , * next = NULL ;
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/*
* Go through the queue and see if we can get any of the locks .
*/
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for ( blr = blocking_lock_queue ; blr ; blr = next ) {
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connection_struct * conn = NULL ;
uint16 vuid ;
files_struct * fsp = NULL ;
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next = blr - > next ;
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/*
* 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 ) ) ;
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if ( ! timeval_is_zero ( & blr - > expire_time ) & & timeval_compare ( & blr - > expire_time , & tv_curr ) < = 0 ) {
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struct byte_range_lock * br_lck = brl_get_locks ( NULL , fsp ) ;
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/*
* Lock expired - throw away all previously
* obtained locks and return lock error .
*/
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if ( br_lck ) {
DEBUG ( 5 , ( " process_blocking_lock_queue: pending lock fnum = %d for file %s timed out. \n " ,
fsp - > fnum , fsp - > fsp_name ) ) ;
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brl_lock_cancel ( br_lck ,
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blr - > lock_pid ,
procid_self ( ) ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ) ;
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TALLOC_FREE ( br_lck ) ;
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}
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blocking_lock_reply_error ( blr , NT_STATUS_FILE_LOCK_CONFLICT ) ;
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DLIST_REMOVE ( blocking_lock_queue , blr ) ;
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free_blocking_lock_record ( blr ) ;
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continue ;
}
if ( ! change_to_user ( conn , vuid ) ) {
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struct byte_range_lock * br_lck = brl_get_locks ( NULL , fsp ) ;
2006-04-10 19:33:04 +04:00
2003-07-24 10:56:56 +04:00
/*
* Remove the entry and return an error to the client .
*/
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if ( br_lck ) {
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brl_lock_cancel ( br_lck ,
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blr - > lock_pid ,
procid_self ( ) ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ) ;
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TALLOC_FREE ( br_lck ) ;
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}
2003-07-24 10:56:56 +04:00
2006-04-10 19:33:04 +04:00
DEBUG ( 0 , ( " process_blocking_lock_queue: Unable to become user vuid=%d. \n " ,
vuid ) ) ;
blocking_lock_reply_error ( blr , NT_STATUS_ACCESS_DENIED ) ;
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DLIST_REMOVE ( blocking_lock_queue , blr ) ;
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free_blocking_lock_record ( blr ) ;
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continue ;
}
2004-06-15 22:36:45 +04:00
if ( ! set_current_service ( conn , SVAL ( blr - > inbuf , smb_flg ) , True ) ) {
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struct byte_range_lock * br_lck = brl_get_locks ( NULL , fsp ) ;
2006-04-10 19:33:04 +04:00
2003-07-24 10:56:56 +04:00
/*
* Remove the entry and return an error to the client .
*/
2006-04-10 19:33:04 +04:00
if ( br_lck ) {
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brl_lock_cancel ( br_lck ,
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blr - > lock_pid ,
procid_self ( ) ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ) ;
2006-07-11 22:01:26 +04:00
TALLOC_FREE ( br_lck ) ;
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}
2003-07-24 10:56:56 +04:00
2006-04-10 19:33:04 +04:00
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 ) ;
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DLIST_REMOVE ( blocking_lock_queue , blr ) ;
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free_blocking_lock_record ( blr ) ;
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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 ) ) {
2006-07-11 22:01:26 +04:00
struct byte_range_lock * br_lck = brl_get_locks ( NULL , fsp ) ;
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if ( br_lck ) {
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brl_lock_cancel ( br_lck ,
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blr - > lock_pid ,
procid_self ( ) ,
blr - > offset ,
blr - > count ,
blr - > lock_flav ) ;
2006-07-11 22:01:26 +04:00
TALLOC_FREE ( br_lck ) ;
2006-04-10 19:33:04 +04:00
}
2003-07-24 10:56:56 +04:00
2006-07-18 01:09:02 +04:00
DLIST_REMOVE ( blocking_lock_queue , blr ) ;
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free_blocking_lock_record ( blr ) ;
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}
change_to_root_user ( ) ;
}
1998-08-19 05:49:57 +04:00
}
2006-07-18 01:09:02 +04:00
/****************************************************************************
Handle a cancel message . Lock already moved onto the cancel queue .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
# define MSG_BLOCKING_LOCK_CANCEL_SIZE (sizeof(blocking_lock_record *) + sizeof(NTSTATUS))
r21064: The core of this patch is
void message_register(int msg_type,
void (*fn)(int msg_type, struct process_id pid,
- void *buf, size_t len))
+ void *buf, size_t len,
+ void *private_data),
+ void *private_data)
{
struct dispatch_fns *dfn;
So this adds a (so far unused) private pointer that is passed from
message_register to the message handler. A prerequisite to implement a tiny
samba4-API compatible wrapper around our messaging system. That itself is
necessary for the Samba4 notify system.
Yes, I know, I could import the whole Samba4 messaging system, but I want to
do it step by step and I think getting notify in is more important in this
step.
Volker
(This used to be commit c8ae60ed65dcce9660ee39c75488f2838cf9a28b)
2007-01-31 01:22:06 +03:00
static void process_blocking_lock_cancel_message ( int msg_type ,
struct process_id src ,
void * buf , size_t len ,
void * private_data )
2006-07-18 01:09:02 +04:00
{
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 )
{
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 ,
r21064: The core of this patch is
void message_register(int msg_type,
void (*fn)(int msg_type, struct process_id pid,
- void *buf, size_t len))
+ void *buf, size_t len,
+ void *private_data),
+ void *private_data)
{
struct dispatch_fns *dfn;
So this adds a (so far unused) private pointer that is passed from
message_register to the message handler. A prerequisite to implement a tiny
samba4-API compatible wrapper around our messaging system. That itself is
necessary for the Samba4 notify system.
Yes, I know, I could import the whole Samba4 messaging system, but I want to
do it step by step and I think getting notify in is more important in this
step.
Volker
(This used to be commit c8ae60ed65dcce9660ee39c75488f2838cf9a28b)
2007-01-31 01:22:06 +03:00
process_blocking_lock_cancel_message ,
NULL ) ;
2006-07-18 01:09:02 +04:00
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 ;
}