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/*
* fs / cifs / misc . c
*
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* Copyright ( C ) International Business Machines Corp . , 2002 , 2008
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* Author ( s ) : Steve French ( sfrench @ us . ibm . com )
*
* This library is free software ; you can redistribute it and / or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation ; either version 2.1 of the License , or
* ( at your option ) any later version .
*
* This library 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 Lesser General Public License for more details .
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library ; if not , write to the Free Software
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* Foundation , Inc . , 59 Temple Place , Suite 330 , Boston , MA 02111 - 1307 USA
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*/
# include <linux/slab.h>
# include <linux/ctype.h>
# include <linux/mempool.h>
# include "cifspdu.h"
# include "cifsglob.h"
# include "cifsproto.h"
# include "cifs_debug.h"
# include "smberr.h"
# include "nterr.h"
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# include "cifs_unicode.h"
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# ifdef CONFIG_CIFS_SMB2
# include "smb2pdu.h"
# endif
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extern mempool_t * cifs_sm_req_poolp ;
extern mempool_t * cifs_req_poolp ;
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/* The xid serves as a useful identifier for each incoming vfs request,
in a similar way to the mid which is useful to track each sent smb ,
and CurrentXid can also provide a running counter ( although it
will eventually wrap past zero ) of the total vfs operations handled
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since the cifs fs was mounted */
unsigned int
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_get_xid ( void )
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{
unsigned int xid ;
spin_lock ( & GlobalMid_Lock ) ;
GlobalTotalActiveXid + + ;
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/* keep high water mark for number of simultaneous ops in filesystem */
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if ( GlobalTotalActiveXid > GlobalMaxActiveXid )
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GlobalMaxActiveXid = GlobalTotalActiveXid ;
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if ( GlobalTotalActiveXid > 65000 )
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cifs_dbg ( FYI , " warning: more than 65000 requests active \n " ) ;
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xid = GlobalCurrentXid + + ;
spin_unlock ( & GlobalMid_Lock ) ;
return xid ;
}
void
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_free_xid ( unsigned int xid )
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{
spin_lock ( & GlobalMid_Lock ) ;
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/* if (GlobalTotalActiveXid == 0)
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BUG ( ) ; */
GlobalTotalActiveXid - - ;
spin_unlock ( & GlobalMid_Lock ) ;
}
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struct cifs_ses *
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sesInfoAlloc ( void )
{
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struct cifs_ses * ret_buf ;
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ret_buf = kzalloc ( sizeof ( struct cifs_ses ) , GFP_KERNEL ) ;
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if ( ret_buf ) {
atomic_inc ( & sesInfoAllocCount ) ;
ret_buf - > status = CifsNew ;
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+ + ret_buf - > ses_count ;
INIT_LIST_HEAD ( & ret_buf - > smb_ses_list ) ;
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INIT_LIST_HEAD ( & ret_buf - > tcon_list ) ;
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mutex_init ( & ret_buf - > session_mutex ) ;
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}
return ret_buf ;
}
void
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sesInfoFree ( struct cifs_ses * buf_to_free )
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{
if ( buf_to_free = = NULL ) {
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cifs_dbg ( FYI , " Null buffer passed to sesInfoFree \n " ) ;
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return ;
}
atomic_dec ( & sesInfoAllocCount ) ;
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kfree ( buf_to_free - > serverOS ) ;
kfree ( buf_to_free - > serverDomain ) ;
kfree ( buf_to_free - > serverNOS ) ;
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if ( buf_to_free - > password ) {
memset ( buf_to_free - > password , 0 , strlen ( buf_to_free - > password ) ) ;
kfree ( buf_to_free - > password ) ;
}
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kfree ( buf_to_free - > user_name ) ;
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kfree ( buf_to_free - > domainName ) ;
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kfree ( buf_to_free - > auth_key . response ) ;
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kfree ( buf_to_free ) ;
}
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struct cifs_tcon *
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tconInfoAlloc ( void )
{
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struct cifs_tcon * ret_buf ;
ret_buf = kzalloc ( sizeof ( struct cifs_tcon ) , GFP_KERNEL ) ;
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if ( ret_buf ) {
atomic_inc ( & tconInfoAllocCount ) ;
ret_buf - > tidStatus = CifsNew ;
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+ + ret_buf - > tc_count ;
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INIT_LIST_HEAD ( & ret_buf - > openFileList ) ;
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INIT_LIST_HEAD ( & ret_buf - > tcon_list ) ;
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spin_lock_init ( & ret_buf - > open_file_lock ) ;
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# ifdef CONFIG_CIFS_STATS
spin_lock_init ( & ret_buf - > stat_lock ) ;
# endif
}
return ret_buf ;
}
void
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tconInfoFree ( struct cifs_tcon * buf_to_free )
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{
if ( buf_to_free = = NULL ) {
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cifs_dbg ( FYI , " Null buffer passed to tconInfoFree \n " ) ;
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return ;
}
atomic_dec ( & tconInfoAllocCount ) ;
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kfree ( buf_to_free - > nativeFileSystem ) ;
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if ( buf_to_free - > password ) {
memset ( buf_to_free - > password , 0 , strlen ( buf_to_free - > password ) ) ;
kfree ( buf_to_free - > password ) ;
}
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kfree ( buf_to_free ) ;
}
struct smb_hdr *
cifs_buf_get ( void )
{
struct smb_hdr * ret_buf = NULL ;
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size_t buf_size = sizeof ( struct smb_hdr ) ;
# ifdef CONFIG_CIFS_SMB2
/*
* SMB2 header is bigger than CIFS one - no problems to clean some
* more bytes for CIFS .
*/
buf_size = sizeof ( struct smb2_hdr ) ;
# endif
/*
* We could use negotiated size instead of max_msgsize -
* but it may be more efficient to always alloc same size
* albeit slightly larger than necessary and maxbuffersize
* defaults to this and can not be bigger .
*/
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ret_buf = mempool_alloc ( cifs_req_poolp , GFP_NOFS ) ;
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/* clear the first few header bytes */
/* for most paths, more is cleared in header_assemble */
if ( ret_buf ) {
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memset ( ret_buf , 0 , buf_size + 3 ) ;
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atomic_inc ( & bufAllocCount ) ;
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# ifdef CONFIG_CIFS_STATS2
atomic_inc ( & totBufAllocCount ) ;
# endif /* CONFIG_CIFS_STATS2 */
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}
return ret_buf ;
}
void
cifs_buf_release ( void * buf_to_free )
{
if ( buf_to_free = = NULL ) {
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/* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/
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return ;
}
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mempool_free ( buf_to_free , cifs_req_poolp ) ;
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atomic_dec ( & bufAllocCount ) ;
return ;
}
struct smb_hdr *
cifs_small_buf_get ( void )
{
struct smb_hdr * ret_buf = NULL ;
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/* We could use negotiated size instead of max_msgsize -
but it may be more efficient to always alloc same size
albeit slightly larger than necessary and maxbuffersize
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defaults to this and can not be bigger */
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ret_buf = mempool_alloc ( cifs_sm_req_poolp , GFP_NOFS ) ;
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if ( ret_buf ) {
/* No need to clear memory here, cleared in header assemble */
/* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
atomic_inc ( & smBufAllocCount ) ;
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# ifdef CONFIG_CIFS_STATS2
atomic_inc ( & totSmBufAllocCount ) ;
# endif /* CONFIG_CIFS_STATS2 */
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}
return ret_buf ;
}
void
cifs_small_buf_release ( void * buf_to_free )
{
if ( buf_to_free = = NULL ) {
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cifs_dbg ( FYI , " Null buffer passed to cifs_small_buf_release \n " ) ;
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return ;
}
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mempool_free ( buf_to_free , cifs_sm_req_poolp ) ;
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atomic_dec ( & smBufAllocCount ) ;
return ;
}
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void
free_rsp_buf ( int resp_buftype , void * rsp )
{
if ( resp_buftype = = CIFS_SMALL_BUFFER )
cifs_small_buf_release ( rsp ) ;
else if ( resp_buftype = = CIFS_LARGE_BUFFER )
cifs_buf_release ( rsp ) ;
}
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/* NB: MID can not be set if treeCon not passed in, in that
case it is responsbility of caller to set the mid */
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void
header_assemble ( struct smb_hdr * buffer , char smb_command /* command */ ,
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const struct cifs_tcon * treeCon , int word_count
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/* length of fixed section (word count) in two byte units */ )
{
char * temp = ( char * ) buffer ;
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memset ( temp , 0 , 256 ) ; /* bigger than MAX_CIFS_HDR_SIZE */
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buffer - > smb_buf_length = cpu_to_be32 (
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( 2 * word_count ) + sizeof ( struct smb_hdr ) -
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4 /* RFC 1001 length field does not count */ +
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2 /* for bcc field itself */ ) ;
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buffer - > Protocol [ 0 ] = 0xFF ;
buffer - > Protocol [ 1 ] = ' S ' ;
buffer - > Protocol [ 2 ] = ' M ' ;
buffer - > Protocol [ 3 ] = ' B ' ;
buffer - > Command = smb_command ;
buffer - > Flags = 0x00 ; /* case sensitive */
buffer - > Flags2 = SMBFLG2_KNOWS_LONG_NAMES ;
buffer - > Pid = cpu_to_le16 ( ( __u16 ) current - > tgid ) ;
buffer - > PidHigh = cpu_to_le16 ( ( __u16 ) ( current - > tgid > > 16 ) ) ;
if ( treeCon ) {
buffer - > Tid = treeCon - > tid ;
if ( treeCon - > ses ) {
if ( treeCon - > ses - > capabilities & CAP_UNICODE )
buffer - > Flags2 | = SMBFLG2_UNICODE ;
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if ( treeCon - > ses - > capabilities & CAP_STATUS32 )
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buffer - > Flags2 | = SMBFLG2_ERR_STATUS ;
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/* Uid is not converted */
buffer - > Uid = treeCon - > ses - > Suid ;
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buffer - > Mid = get_next_mid ( treeCon - > ses - > server ) ;
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}
if ( treeCon - > Flags & SMB_SHARE_IS_IN_DFS )
buffer - > Flags2 | = SMBFLG2_DFS ;
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if ( treeCon - > nocase )
buffer - > Flags | = SMBFLG_CASELESS ;
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if ( ( treeCon - > ses ) & & ( treeCon - > ses - > server ) )
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if ( treeCon - > ses - > server - > sign )
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buffer - > Flags2 | = SMBFLG2_SECURITY_SIGNATURE ;
}
/* endian conversion of flags is now done just before sending */
buffer - > WordCount = ( char ) word_count ;
return ;
}
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static int
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check_smb_hdr ( struct smb_hdr * smb )
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{
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/* does it have the right SMB "signature" ? */
if ( * ( __le32 * ) smb - > Protocol ! = cpu_to_le32 ( 0x424d53ff ) ) {
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cifs_dbg ( VFS , " Bad protocol string signature header 0x%x \n " ,
* ( unsigned int * ) smb - > Protocol ) ;
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return 1 ;
}
/* if it's a response then accept */
if ( smb - > Flags & SMBFLG_RESPONSE )
return 0 ;
/* only one valid case where server sends us request */
if ( smb - > Command = = SMB_COM_LOCKING_ANDX )
return 0 ;
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cifs_dbg ( VFS , " Server sent request, not response. mid=%u \n " ,
get_mid ( smb ) ) ;
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return 1 ;
}
int
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checkSMB ( char * buf , unsigned int total_read , struct TCP_Server_Info * server )
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{
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struct smb_hdr * smb = ( struct smb_hdr * ) buf ;
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__u32 rfclen = be32_to_cpu ( smb - > smb_buf_length ) ;
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__u32 clc_len ; /* calculated length */
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cifs_dbg ( FYI , " checkSMB Length: 0x%x, smb_buf_length: 0x%x \n " ,
total_read , rfclen ) ;
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/* is this frame too small to even get to a BCC? */
if ( total_read < 2 + sizeof ( struct smb_hdr ) ) {
if ( ( total_read > = sizeof ( struct smb_hdr ) - 1 )
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& & ( smb - > Status . CifsError ! = 0 ) ) {
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/* it's an error return */
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smb - > WordCount = 0 ;
/* some error cases do not return wct and bcc */
return 0 ;
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} else if ( ( total_read = = sizeof ( struct smb_hdr ) + 1 ) & &
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( smb - > WordCount = = 0 ) ) {
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char * tmp = ( char * ) smb ;
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/* Need to work around a bug in two servers here */
/* First, check if the part of bcc they sent was zero */
if ( tmp [ sizeof ( struct smb_hdr ) ] = = 0 ) {
/* some servers return only half of bcc
* on simple responses ( wct , bcc both zero )
* in particular have seen this on
* ulogoffX and FindClose . This leaves
* one byte of bcc potentially unitialized
*/
/* zero rest of bcc */
tmp [ sizeof ( struct smb_hdr ) + 1 ] = 0 ;
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return 0 ;
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}
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cifs_dbg ( VFS , " rcvd invalid byte count (bcc) \n " ) ;
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} else {
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cifs_dbg ( VFS , " Length less than smb header size \n " ) ;
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}
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return - EIO ;
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}
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/* otherwise, there is enough to get to the BCC */
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if ( check_smb_hdr ( smb ) )
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return - EIO ;
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clc_len = smbCalcSize ( smb ) ;
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if ( 4 + rfclen ! = total_read ) {
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cifs_dbg ( VFS , " Length read does not match RFC1001 length %d \n " ,
rfclen ) ;
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return - EIO ;
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}
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if ( 4 + rfclen ! = clc_len ) {
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__u16 mid = get_mid ( smb ) ;
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/* check if bcc wrapped around for large read responses */
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if ( ( rfclen > 64 * 1024 ) & & ( rfclen > clc_len ) ) {
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/* check if lengths match mod 64K */
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if ( ( ( 4 + rfclen ) & 0xFFFF ) = = ( clc_len & 0xFFFF ) )
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return 0 ; /* bcc wrapped */
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}
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cifs_dbg ( FYI , " Calculated size %u vs length %u mismatch for mid=%u \n " ,
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clc_len , 4 + rfclen , mid ) ;
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if ( 4 + rfclen < clc_len ) {
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cifs_dbg ( VFS , " RFC1001 size %u smaller than SMB for mid=%u \n " ,
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rfclen , mid ) ;
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return - EIO ;
} else if ( rfclen > clc_len + 512 ) {
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/*
* Some servers ( Windows XP in particular ) send more
* data than the lengths in the SMB packet would
* indicate on certain calls ( byte range locks and
* trans2 find first calls in particular ) . While the
* client can handle such a frame by ignoring the
* trailing data , we choose limit the amount of extra
* data to 512 bytes .
*/
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cifs_dbg ( VFS , " RFC1001 size %u more than 512 bytes larger than SMB for mid=%u \n " ,
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rfclen , mid ) ;
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return - EIO ;
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}
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}
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return 0 ;
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}
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bool
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is_valid_oplock_break ( char * buffer , struct TCP_Server_Info * srv )
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{
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struct smb_hdr * buf = ( struct smb_hdr * ) buffer ;
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struct smb_com_lock_req * pSMB = ( struct smb_com_lock_req * ) buf ;
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struct list_head * tmp , * tmp1 , * tmp2 ;
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struct cifs_ses * ses ;
struct cifs_tcon * tcon ;
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struct cifsInodeInfo * pCifsInode ;
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struct cifsFileInfo * netfile ;
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cifs_dbg ( FYI , " Checking for oplock break or dnotify response \n " ) ;
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if ( ( pSMB - > hdr . Command = = SMB_COM_NT_TRANSACT ) & &
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( pSMB - > hdr . Flags & SMBFLG_RESPONSE ) ) {
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struct smb_com_transaction_change_notify_rsp * pSMBr =
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( struct smb_com_transaction_change_notify_rsp * ) buf ;
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struct file_notify_information * pnotify ;
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__u32 data_offset = 0 ;
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if ( get_bcc ( buf ) > sizeof ( struct file_notify_information ) ) {
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data_offset = le32_to_cpu ( pSMBr - > DataOffset ) ;
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pnotify = ( struct file_notify_information * )
( ( char * ) & pSMBr - > hdr . Protocol + data_offset ) ;
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cifs_dbg ( FYI , " dnotify on %s Action: 0x%x \n " ,
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pnotify - > FileName , pnotify - > Action ) ;
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/* cifs_dump_mem("Rcvd notify Data: ",buf,
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sizeof ( struct smb_hdr ) + 60 ) ; */
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return true ;
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}
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if ( pSMBr - > hdr . Status . CifsError ) {
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cifs_dbg ( FYI , " notify err 0x%x \n " ,
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pSMBr - > hdr . Status . CifsError ) ;
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return true ;
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}
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return false ;
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}
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if ( pSMB - > hdr . Command ! = SMB_COM_LOCKING_ANDX )
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return false ;
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if ( pSMB - > hdr . Flags & SMBFLG_RESPONSE ) {
2005-04-17 05:20:36 +07:00
/* no sense logging error on invalid handle on oplock
break - harmless race between close request and oplock
break response is expected from time to time writing out
large dirty files cached on the client */
2007-07-10 08:16:18 +07:00
if ( ( NT_STATUS_INVALID_HANDLE ) = =
le32_to_cpu ( pSMB - > hdr . Status . CifsError ) ) {
2013-05-05 10:12:25 +07:00
cifs_dbg ( FYI , " invalid handle on oplock break \n " ) ;
2008-04-29 07:06:05 +07:00
return true ;
2007-07-10 08:16:18 +07:00
} else if ( ERRbadfid = =
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le16_to_cpu ( pSMB - > hdr . Status . DosError . Error ) ) {
2008-04-29 07:06:05 +07:00
return true ;
2005-04-17 05:20:36 +07:00
} else {
2008-04-29 07:06:05 +07:00
return false ; /* on valid oplock brk we get "request" */
2005-04-17 05:20:36 +07:00
}
}
2007-07-08 02:25:05 +07:00
if ( pSMB - > hdr . WordCount ! = 8 )
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return false ;
2005-04-17 05:20:36 +07:00
2014-08-03 09:16:48 +07:00
cifs_dbg ( FYI , " oplock type 0x%x level 0x%x \n " ,
2010-04-21 10:50:45 +07:00
pSMB - > LockType , pSMB - > OplockLevel ) ;
2007-07-08 02:25:05 +07:00
if ( ! ( pSMB - > LockType & LOCKING_ANDX_OPLOCK_RELEASE ) )
2008-04-29 07:06:05 +07:00
return false ;
2005-04-17 05:20:36 +07:00
/* look up tcon based on tid & uid */
2010-10-19 00:59:37 +07:00
spin_lock ( & cifs_tcp_ses_lock ) ;
2008-11-15 23:12:47 +07:00
list_for_each ( tmp , & srv - > smb_ses_list ) {
2011-05-27 11:34:02 +07:00
ses = list_entry ( tmp , struct cifs_ses , smb_ses_list ) ;
2008-11-15 23:12:47 +07:00
list_for_each ( tmp1 , & ses - > tcon_list ) {
2011-05-27 11:34:02 +07:00
tcon = list_entry ( tmp1 , struct cifs_tcon , tcon_list ) ;
2008-11-15 23:12:47 +07:00
if ( tcon - > tid ! = buf - > Tid )
continue ;
2012-05-28 17:16:31 +07:00
cifs_stats_inc ( & tcon - > stats . cifs_stats . num_oplock_brks ) ;
2016-09-23 06:58:16 +07:00
spin_lock ( & tcon - > open_file_lock ) ;
2008-11-15 23:12:47 +07:00
list_for_each ( tmp2 , & tcon - > openFileList ) {
netfile = list_entry ( tmp2 , struct cifsFileInfo ,
2005-04-29 12:41:10 +07:00
tlist ) ;
2012-09-19 06:20:26 +07:00
if ( pSMB - > Fid ! = netfile - > fid . netfid )
2008-11-15 23:12:47 +07:00
continue ;
2013-05-05 10:12:25 +07:00
cifs_dbg ( FYI , " file id match, oplock break \n " ) ;
2015-03-18 05:25:59 +07:00
pCifsInode = CIFS_I ( d_inode ( netfile - > dentry ) ) ;
2010-07-21 03:09:02 +07:00
2014-03-11 23:11:47 +07:00
set_bit ( CIFS_INODE_PENDING_OPLOCK_BREAK ,
& pCifsInode - > flags ) ;
/*
* Set flag if the server downgrades the oplock
* to L2 else clear .
*/
if ( pSMB - > OplockLevel )
set_bit (
CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2 ,
& pCifsInode - > flags ) ;
else
clear_bit (
CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2 ,
& pCifsInode - > flags ) ;
2012-03-24 01:40:53 +07:00
queue_work ( cifsiod_wq ,
2011-07-26 23:20:17 +07:00
& netfile - > oplock_break ) ;
2010-07-21 03:09:02 +07:00
netfile - > oplock_break_cancelled = false ;
2016-09-23 06:58:16 +07:00
spin_unlock ( & tcon - > open_file_lock ) ;
2010-10-19 00:59:37 +07:00
spin_unlock ( & cifs_tcp_ses_lock ) ;
2008-11-15 23:12:47 +07:00
return true ;
2005-04-17 05:20:36 +07:00
}
2016-09-23 06:58:16 +07:00
spin_unlock ( & tcon - > open_file_lock ) ;
2010-10-19 00:59:37 +07:00
spin_unlock ( & cifs_tcp_ses_lock ) ;
2013-05-05 10:12:25 +07:00
cifs_dbg ( FYI , " No matching file for oplock break \n " ) ;
2008-04-29 07:06:05 +07:00
return true ;
2005-04-17 05:20:36 +07:00
}
}
2010-10-19 00:59:37 +07:00
spin_unlock ( & cifs_tcp_ses_lock ) ;
2013-05-05 10:12:25 +07:00
cifs_dbg ( FYI , " Can not process oplock break for non-existent connection \n " ) ;
2008-04-29 07:06:05 +07:00
return true ;
2005-04-17 05:20:36 +07:00
}
void
2012-03-24 01:28:02 +07:00
dump_smb ( void * buf , int smb_buf_length )
2005-04-17 05:20:36 +07:00
{
if ( traceSMB = = 0 )
return ;
2014-08-27 20:49:43 +07:00
print_hex_dump ( KERN_DEBUG , " " , DUMP_PREFIX_NONE , 8 , 2 , buf ,
smb_buf_length , true ) ;
2005-04-17 05:20:36 +07:00
}
2005-04-29 12:41:05 +07:00
2009-11-07 02:18:29 +07:00
void
cifs_autodisable_serverino ( struct cifs_sb_info * cifs_sb )
{
if ( cifs_sb - > mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM ) {
2009-11-16 13:33:16 +07:00
cifs_sb - > mnt_cifs_flags & = ~ CIFS_MOUNT_SERVER_INUM ;
2013-05-05 10:12:25 +07:00
cifs_dbg ( VFS , " Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \" noserverino \" option to silence this message. \n " ,
cifs_sb_master_tcon ( cifs_sb ) - > treeName ) ;
2009-11-07 02:18:29 +07:00
}
}
2010-11-02 16:00:42 +07:00
2010-11-03 14:58:57 +07:00
void cifs_set_oplock_level ( struct cifsInodeInfo * cinode , __u32 oplock )
2010-11-02 16:00:42 +07:00
{
2010-11-03 14:58:57 +07:00
oplock & = 0xF ;
2010-11-02 16:00:42 +07:00
2010-11-03 14:58:57 +07:00
if ( oplock = = OPLOCK_EXCLUSIVE ) {
2013-09-05 16:01:06 +07:00
cinode - > oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG ;
2013-05-05 10:12:25 +07:00
cifs_dbg ( FYI , " Exclusive Oplock granted on inode %p \n " ,
& cinode - > vfs_inode ) ;
2010-11-03 14:58:57 +07:00
} else if ( oplock = = OPLOCK_READ ) {
2013-09-05 16:01:06 +07:00
cinode - > oplock = CIFS_CACHE_READ_FLG ;
2013-05-05 10:12:25 +07:00
cifs_dbg ( FYI , " Level II Oplock granted on inode %p \n " ,
& cinode - > vfs_inode ) ;
2013-09-05 16:01:06 +07:00
} else
cinode - > oplock = 0 ;
2010-11-02 16:00:42 +07:00
}
2011-09-26 21:56:44 +07:00
2014-03-11 23:11:47 +07:00
/*
* We wait for oplock breaks to be processed before we attempt to perform
* writes .
*/
int cifs_get_writer ( struct cifsInodeInfo * cinode )
{
int rc ;
start :
rc = wait_on_bit ( & cinode - > flags , CIFS_INODE_PENDING_OPLOCK_BREAK ,
sched: Remove proliferation of wait_on_bit() action functions
The current "wait_on_bit" interface requires an 'action'
function to be provided which does the actual waiting.
There are over 20 such functions, many of them identical.
Most cases can be satisfied by one of just two functions, one
which uses io_schedule() and one which just uses schedule().
So:
Rename wait_on_bit and wait_on_bit_lock to
wait_on_bit_action and wait_on_bit_lock_action
to make it explicit that they need an action function.
Introduce new wait_on_bit{,_lock} and wait_on_bit{,_lock}_io
which are *not* given an action function but implicitly use
a standard one.
The decision to error-out if a signal is pending is now made
based on the 'mode' argument rather than being encoded in the action
function.
All instances of the old wait_on_bit and wait_on_bit_lock which
can use the new version have been changed accordingly and their
action functions have been discarded.
wait_on_bit{_lock} does not return any specific error code in the
event of a signal so the caller must check for non-zero and
interpolate their own error code as appropriate.
The wait_on_bit() call in __fscache_wait_on_invalidate() was
ambiguous as it specified TASK_UNINTERRUPTIBLE but used
fscache_wait_bit_interruptible as an action function.
David Howells confirms this should be uniformly
"uninterruptible"
The main remaining user of wait_on_bit{,_lock}_action is NFS
which needs to use a freezer-aware schedule() call.
A comment in fs/gfs2/glock.c notes that having multiple 'action'
functions is useful as they display differently in the 'wchan'
field of 'ps'. (and /proc/$PID/wchan).
As the new bit_wait{,_io} functions are tagged "__sched", they
will not show up at all, but something higher in the stack. So
the distinction will still be visible, only with different
function names (gds2_glock_wait versus gfs2_glock_dq_wait in the
gfs2/glock.c case).
Since first version of this patch (against 3.15) two new action
functions appeared, on in NFS and one in CIFS. CIFS also now
uses an action function that makes the same freezer aware
schedule call as NFS.
Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: David Howells <dhowells@redhat.com> (fscache, keys)
Acked-by: Steven Whitehouse <swhiteho@redhat.com> (gfs2)
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steve French <sfrench@samba.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140707051603.28027.72349.stgit@notabene.brown
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-07-07 12:16:04 +07:00
TASK_KILLABLE ) ;
2014-03-11 23:11:47 +07:00
if ( rc )
return rc ;
spin_lock ( & cinode - > writers_lock ) ;
if ( ! cinode - > writers )
set_bit ( CIFS_INODE_PENDING_WRITERS , & cinode - > flags ) ;
cinode - > writers + + ;
/* Check to see if we have started servicing an oplock break */
if ( test_bit ( CIFS_INODE_PENDING_OPLOCK_BREAK , & cinode - > flags ) ) {
cinode - > writers - - ;
if ( cinode - > writers = = 0 ) {
clear_bit ( CIFS_INODE_PENDING_WRITERS , & cinode - > flags ) ;
wake_up_bit ( & cinode - > flags , CIFS_INODE_PENDING_WRITERS ) ;
}
spin_unlock ( & cinode - > writers_lock ) ;
goto start ;
}
spin_unlock ( & cinode - > writers_lock ) ;
return 0 ;
}
void cifs_put_writer ( struct cifsInodeInfo * cinode )
{
spin_lock ( & cinode - > writers_lock ) ;
cinode - > writers - - ;
if ( cinode - > writers = = 0 ) {
clear_bit ( CIFS_INODE_PENDING_WRITERS , & cinode - > flags ) ;
wake_up_bit ( & cinode - > flags , CIFS_INODE_PENDING_WRITERS ) ;
}
spin_unlock ( & cinode - > writers_lock ) ;
}
void cifs_done_oplock_break ( struct cifsInodeInfo * cinode )
{
clear_bit ( CIFS_INODE_PENDING_OPLOCK_BREAK , & cinode - > flags ) ;
wake_up_bit ( & cinode - > flags , CIFS_INODE_PENDING_OPLOCK_BREAK ) ;
}
2011-09-26 21:56:44 +07:00
bool
backup_cred ( struct cifs_sb_info * cifs_sb )
{
if ( cifs_sb - > mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID ) {
2013-02-06 16:20:20 +07:00
if ( uid_eq ( cifs_sb - > mnt_backupuid , current_fsuid ( ) ) )
2011-09-26 21:56:44 +07:00
return true ;
}
if ( cifs_sb - > mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID ) {
if ( in_group_p ( cifs_sb - > mnt_backupgid ) )
return true ;
}
return false ;
}
2012-09-19 20:22:45 +07:00
void
cifs_del_pending_open ( struct cifs_pending_open * open )
{
2016-09-23 06:58:16 +07:00
spin_lock ( & tlink_tcon ( open - > tlink ) - > open_file_lock ) ;
2012-09-19 20:22:45 +07:00
list_del ( & open - > olist ) ;
2016-09-23 06:58:16 +07:00
spin_unlock ( & tlink_tcon ( open - > tlink ) - > open_file_lock ) ;
2012-09-19 20:22:45 +07:00
}
void
cifs_add_pending_open_locked ( struct cifs_fid * fid , struct tcon_link * tlink ,
struct cifs_pending_open * open )
{
# ifdef CONFIG_CIFS_SMB2
memcpy ( open - > lease_key , fid - > lease_key , SMB2_LEASE_KEY_SIZE ) ;
# endif
open - > oplock = CIFS_OPLOCK_NO_CHANGE ;
open - > tlink = tlink ;
fid - > pending_open = open ;
list_add_tail ( & open - > olist , & tlink_tcon ( tlink ) - > pending_opens ) ;
}
void
cifs_add_pending_open ( struct cifs_fid * fid , struct tcon_link * tlink ,
struct cifs_pending_open * open )
{
2016-09-23 06:58:16 +07:00
spin_lock ( & tlink_tcon ( tlink ) - > open_file_lock ) ;
2012-09-19 20:22:45 +07:00
cifs_add_pending_open_locked ( fid , tlink , open ) ;
2016-09-23 06:58:16 +07:00
spin_unlock ( & tlink_tcon ( open - > tlink ) - > open_file_lock ) ;
2012-09-19 20:22:45 +07:00
}