Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  [CIFS] Fix check after use error in ACL code
  [CIFS] Fix potential data corruption when writing out cached dirty pages
  [CIFS] Fix spurious reconnect on 2nd peek from read of SMB length
  [CIFS] remove build warning
  [CIFS] Have CIFS_SessSetup build correct SPNEGO SessionSetup request
  [CIFS] minor checkpatch cleanup
  [CIFS] have cifs_get_spnego_key get the hostname from TCP_Server_Info
  [CIFS] add hostname field to TCP_Server_Info struct
  [CIFS] clean up error handling in cifs_mount
  [CIFS] add ver= prefix to upcall format version
  [CIFS] Fix buffer overflow if server sends corrupt response to small

fs/cifs/CHANGES

 Version 1.52
 ------------
 Fix oops on second mount to server when null auth is used.
+Enable experimental Kerberos support.  Return writebehind errors on flush
+and sync so that events like out of disk space get reported properly on
+cached files.
 
 Version 1.51
 ------------

fs/cifs/README

@@ -225,12 +225,9 @@ If no password is provided, mount.cifs will prompt for password entry
 
 Restrictions
 ============
-Servers must support the NTLM SMB dialect (which is the most recent, supported 
-by Samba and Windows NT version 4, 2000 and XP and many other SMB/CIFS servers) 
 Servers must support either "pure-TCP" (port 445 TCP/IP CIFS connections) or RFC 
-1001/1002 support for "Netbios-Over-TCP/IP." Neither of these is likely to be a 
-problem as most servers support this.  IPv6 support is planned for the future,
-and is almost complete.
+1001/1002 support for "Netbios-Over-TCP/IP." This is not likely to be a 
+problem as most servers support this.
 
 Valid filenames differ between Windows and Linux.  Windows typically restricts
 filenames which contain certain reserved characters (e.g.the character : 
@@ -458,6 +455,8 @@ A partial list of the supported mount options follows:
 		byte range locks).
  remount        remount the share (often used to change from ro to rw mounts
 	        or vice versa)
+ cifsacl        Report mode bits (e.g. on stat) based on the Windows ACL for
+	        the file. (EXPERIMENTAL)
  servern        Specify the server 's netbios name (RFC1001 name) to use
 		when attempting to setup a session to the server.  This is
 		This is needed for mounting to some older servers (such
@@ -584,8 +583,8 @@ Experimental            When set to 1 used to enable certain experimental
 			performance enhancement was disabled when
 			signing turned on in case buffer was modified
 			just before it was sent, also this flag will
-			be used to use the new experimental sessionsetup
-			code).
+			be used to use the new experimental directory change 
+			notification code).
 
 These experimental features and tracing can be enabled by changing flags in 
 /proc/fs/cifs (after the cifs module has been installed or built into the 
@@ -608,7 +607,8 @@ the start of smb requests and responses can be enabled via:
 Two other experimental features are under development. To test these
 requires enabling CONFIG_CIFS_EXPERIMENTAL
 
-	ipv6 enablement
+	cifsacl support needed to retrieve approximated mode bits based on
+		the contents on the CIFS ACL.
 
 	DNOTIFY fcntl: needed for support of directory change 
 			    notification and perhaps later for file leases)
@@ -625,10 +625,7 @@ that they represent all for that share, not just those for which the server
 returned success.
 	
 Also note that "cat /proc/fs/cifs/DebugData" will display information about 
-the active sessions and the shares that are mounted.  Note: NTLMv2 enablement 
-will not work since its implementation is not quite complete yet. Do not alter
-the ExtendedSecurity configuration value unless you are doing specific testing.
-Enabling extended security works to Windows 2000 Workstations and XP but not to 
-Windows 2000 server or Samba since it does not usually send "raw NTLMSSP" 
-(instead it sends NTLMSSP encapsulated in SPNEGO/GSSAPI, which support is not 
-complete in the CIFS VFS yet).  
+the active sessions and the shares that are mounted.
+Enabling Kerberos (extended security) works when CONFIG_CIFS_EXPERIMENTAL is enabled
+but requires a user space helper (from the Samba project). NTLM and NTLMv2 and
+LANMAN support do not require this helpr.

fs/cifs/TODO

@@ -16,7 +16,7 @@ SecurityDescriptors
 c) Better pam/winbind integration (e.g. to handle uid mapping
 better)
 
-d) Kerberos/SPNEGO session setup support - (started)
+d) Verify that Kerberos signing works
 
 e) Cleanup now unneeded SessSetup code in
 fs/cifs/connect.c and add back in NTLMSSP code if any servers

fs/cifs/cifs_spnego.c

@@ -66,20 +66,26 @@ struct key_type cifs_spnego_key_type = {
 	.describe	= user_describe,
 };
 
+#define MAX_VER_STR_LEN   9 /* length of longest version string e.g.
+				strlen(";ver=0xFF") */
+#define MAX_MECH_STR_LEN 13 /* length of longest security mechanism name, eg
+			       in future could have strlen(";sec=ntlmsspi") */
+#define MAX_IPV6_ADDR_LEN 42 /* eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/60 */
 /* get a key struct with a SPNEGO security blob, suitable for session setup */
 struct key *
-cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
+cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
 {
 	struct TCP_Server_Info *server = sesInfo->server;
 	char *description, *dp;
 	size_t desc_len;
 	struct key *spnego_key;
+	const char *hostname = server->hostname;
 
-
-	/* version + ;ip{4|6}= + address + ;host=hostname +
-		;sec= + ;uid= + NULL */
-	desc_len = 4 + 5 + 32 + 1 + 5 + strlen(hostname) +
-		   strlen(";sec=krb5") + 7 + sizeof(uid_t)*2 + 1;
+	/* BB: come up with better scheme for determining length */
+	/* length of fields (with semicolons): ver=0xyz ipv4= ipaddress host=
+	   hostname sec=mechanism uid=0x uid */
+	desc_len = MAX_VER_STR_LEN + 5 + MAX_IPV6_ADDR_LEN + 1 + 6 +
+		  strlen(hostname) + MAX_MECH_STR_LEN + 8 + (sizeof(uid_t) * 2);
 	spnego_key = ERR_PTR(-ENOMEM);
 	description = kzalloc(desc_len, GFP_KERNEL);
 	if (description == NULL)
@@ -88,7 +94,7 @@ cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
 	dp = description;
 	/* start with version and hostname portion of UNC string */
 	spnego_key = ERR_PTR(-EINVAL);
-	sprintf(dp, "0x%2.2x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
+	sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
 		hostname);
 	dp = description + strlen(description);
 

fs/cifs/cifs_spnego.h

@@ -41,6 +41,7 @@ struct cifs_spnego_msg {
 
 #ifdef __KERNEL__
 extern struct key_type cifs_spnego_key_type;
+extern struct key *cifs_get_spnego_key(struct cifsSesInfo *sesInfo);
 #endif /* KERNEL */
 
 #endif /* _CIFS_SPNEGO_H */

fs/cifs/cifsacl.c

@@ -269,6 +269,13 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
 
 	/* BB need to add parm so we can store the SID BB */
 
+	if (!pdacl) {
+		/* no DACL in the security descriptor, set
+		   all the permissions for user/group/other */
+		inode->i_mode |= S_IRWXUGO;
+		return;
+	}
+
 	/* validate that we do not go past end of acl */
 	if (end_of_acl < (char *)pdacl + le16_to_cpu(pdacl->size)) {
 		cERROR(1, ("ACL too small to parse DACL"));
@@ -286,12 +293,6 @@ static void parse_dacl(struct cifs_acl *pdacl, char *end_of_acl,
 	   user/group/other have no permissions */
 	inode->i_mode &= ~(S_IRWXUGO);
 
-	if (!pdacl) {
-		/* no DACL in the security descriptor, set
-		   all the permissions for user/group/other */
-		inode->i_mode |= S_IRWXUGO;
-		return;
-	}
 	acl_base = (char *)pdacl;
 	acl_size = sizeof(struct cifs_acl);
 

fs/cifs/cifsfs.c

@@ -266,6 +266,7 @@ cifs_alloc_inode(struct super_block *sb)
 	cifs_inode->cifsAttrs = 0x20;	/* default */
 	atomic_set(&cifs_inode->inUse, 0);
 	cifs_inode->time = 0;
+	cifs_inode->write_behind_rc = 0;
 	/* Until the file is open and we have gotten oplock
 	info back from the server, can not assume caching of
 	file data or metadata */
@@ -852,7 +853,7 @@ static int cifs_oplock_thread(void *dummyarg)
 	struct cifsTconInfo *pTcon;
 	struct inode *inode;
 	__u16  netfid;
-	int rc;
+	int rc, waitrc = 0;
 
 	set_freezable();
 	do {
@@ -884,9 +885,11 @@ static int cifs_oplock_thread(void *dummyarg)
 					   filemap_fdatawrite(inode->i_mapping);
 					if (CIFS_I(inode)->clientCanCacheRead
 									 == 0) {
-						filemap_fdatawait(inode->i_mapping);
+						waitrc = filemap_fdatawait(inode->i_mapping);
 						invalidate_remote_inode(inode);
 					}
+					if (rc == 0)
+						rc = waitrc;
 				} else
 					rc = 0;
 				/* mutex_unlock(&inode->i_mutex);*/

fs/cifs/cifsglob.h

@@ -110,6 +110,7 @@ struct mac_key {
 	unsigned int len;
 	union {
 		char ntlm[CIFS_SESS_KEY_SIZE + 16];
+		char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
 		struct {
 			char key[16];
 			struct ntlmv2_resp resp;
@@ -139,6 +140,7 @@ struct TCP_Server_Info {
 	/* 15 character server name + 0x20 16th byte indicating type = srv */
 	char server_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 	char unicode_server_Name[SERVER_NAME_LEN_WITH_NULL * 2];
+	char *hostname; /* hostname portion of UNC string */
 	struct socket *ssocket;
 	union {
 		struct sockaddr_in sockAddr;
@@ -471,6 +473,17 @@ struct dir_notify_req {
 #define   CIFS_LARGE_BUFFER     2
 #define   CIFS_IOVEC            4    /* array of response buffers */
 
+/* Type of Request to SendReceive2 */
+#define   CIFS_STD_OP	        0    /* normal request timeout */
+#define   CIFS_LONG_OP          1    /* long op (up to 45 sec, oplock time) */
+#define   CIFS_VLONG_OP         2    /* sloow op - can take up to 180 seconds */
+#define   CIFS_BLOCKING_OP      4    /* operation can block */
+#define   CIFS_ASYNC_OP         8    /* do not wait for response */
+#define   CIFS_TIMEOUT_MASK 0x00F    /* only one of 5 above set in req */
+#define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
+#define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
+#define   CIFS_NO_RESP      0x040    /* no response buffer required */
+
 /* Security Flags: indicate type of session setup needed */
 #define   CIFSSEC_MAY_SIGN	0x00001
 #define   CIFSSEC_MAY_NTLM	0x00002

fs/cifs/cifsproto.h

@@ -48,10 +48,11 @@ extern int SendReceive(const unsigned int /* xid */ , struct cifsSesInfo *,
 			struct smb_hdr * /* input */ ,
 			struct smb_hdr * /* out */ ,
 			int * /* bytes returned */ , const int long_op);
+extern int SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
+			struct smb_hdr *in_buf, int flags);
 extern int SendReceive2(const unsigned int /* xid */ , struct cifsSesInfo *,
 			struct kvec *, int /* nvec to send */,
-			int * /* type of buf returned */ , const int long_op,
-			const int logError /* whether to log status code*/ );
+			int * /* type of buf returned */ , const int flags);
 extern int SendReceiveBlockingLock(const unsigned int /* xid */ ,
 					struct cifsTconInfo *,
 				struct smb_hdr * /* input */ ,
@@ -76,8 +77,6 @@ extern void header_assemble(struct smb_hdr *, char /* command */ ,
 extern int small_smb_init_no_tc(const int smb_cmd, const int wct,
 				struct cifsSesInfo *ses,
 				void **request_buf);
-extern struct key *cifs_get_spnego_key(struct cifsSesInfo *sesInfo,
-					const char *hostname);
 extern int CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
 			     const int stage,
 			     const struct nls_table *nls_cp);
@@ -248,15 +247,15 @@ extern int CIFSSMBQueryReparseLinkInfo(const int xid,
 extern int CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
 			const char *fileName, const int disposition,
 			const int access_flags, const int omode,
-			__u16 * netfid, int *pOplock, FILE_ALL_INFO *,
+			__u16 *netfid, int *pOplock, FILE_ALL_INFO *,
 			const struct nls_table *nls_codepage, int remap);
 extern int SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
 			const char *fileName, const int disposition,
 			const int access_flags, const int omode,
-			__u16 * netfid, int *pOplock, FILE_ALL_INFO *,
+			__u16 *netfid, int *pOplock, FILE_ALL_INFO *,
 			const struct nls_table *nls_codepage, int remap);
 extern int CIFSPOSIXCreate(const int xid, struct cifsTconInfo *tcon,
-			u32 posix_flags, __u64 mode, __u16 * netfid,
+			u32 posix_flags, __u64 mode, __u16 *netfid,
 			FILE_UNIX_BASIC_INFO *pRetData,
 			__u32 *pOplock, const char *name,
 			const struct nls_table *nls_codepage, int remap);
@@ -277,7 +276,7 @@ extern int CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
 			const __u64 offset, unsigned int *nbytes,
 			struct kvec *iov, const int nvec, const int long_op);
 extern int CIFSGetSrvInodeNumber(const int xid, struct cifsTconInfo *tcon,
-			const unsigned char *searchName, __u64 * inode_number,
+			const unsigned char *searchName, __u64 *inode_number,
 			const struct nls_table *nls_codepage,
 			int remap_special_chars);
 extern int cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,
@@ -352,5 +351,5 @@ extern int CIFSSMBSetPosixACL(const int xid, struct cifsTconInfo *tcon,
 		const char *local_acl, const int buflen, const int acl_type,
 		const struct nls_table *nls_codepage, int remap_special_chars);
 extern int CIFSGetExtAttr(const int xid, struct cifsTconInfo *tcon,
-			const int netfid, __u64 * pExtAttrBits, __u64 *pMask);
+			const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
 #endif			/* _CIFSPROTO_H */

fs/cifs/cifssmb.c

@@ -698,9 +698,7 @@ int
 CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
 {
 	struct smb_hdr *smb_buffer;
-	struct smb_hdr *smb_buffer_response; /* BB removeme BB */
 	int rc = 0;
-	int length;
 
 	cFYI(1, ("In tree disconnect"));
 	/*
@@ -737,16 +735,12 @@ CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
 	if (rc) {
 		up(&tcon->tconSem);
 		return rc;
-	} else {
-		smb_buffer_response = smb_buffer; /* BB removeme BB */
 	}
-	rc = SendReceive(xid, tcon->ses, smb_buffer, smb_buffer_response,
-			 &length, 0);
+
+	rc = SendReceiveNoRsp(xid, tcon->ses, smb_buffer, 0);
 	if (rc)
 		cFYI(1, ("Tree disconnect failed %d", rc));
 
-	if (smb_buffer)
-		cifs_small_buf_release(smb_buffer);
 	up(&tcon->tconSem);
 
 	/* No need to return error on this operation if tid invalidated and
@@ -760,10 +754,8 @@ CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
 int
 CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
 {
-	struct smb_hdr *smb_buffer_response;
 	LOGOFF_ANDX_REQ *pSMB;
 	int rc = 0;
-	int length;
 
 	cFYI(1, ("In SMBLogoff for session disconnect"));
 	if (ses)
@@ -782,8 +774,6 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
 		return rc;
 	}
 
-	smb_buffer_response = (struct smb_hdr *)pSMB; /* BB removeme BB */
-
 	if (ses->server) {
 		pSMB->hdr.Mid = GetNextMid(ses->server);
 
@@ -795,8 +785,7 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
 	pSMB->hdr.Uid = ses->Suid;
 
 	pSMB->AndXCommand = 0xFF;
-	rc = SendReceive(xid, ses, (struct smb_hdr *) pSMB,
-			 smb_buffer_response, &length, 0);
+	rc = SendReceiveNoRsp(xid, ses, (struct smb_hdr *) pSMB, 0);
 	if (ses->server) {
 		atomic_dec(&ses->server->socketUseCount);
 		if (atomic_read(&ses->server->socketUseCount) == 0) {
@@ -807,7 +796,6 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
 		}
 	}
 	up(&ses->sesSem);
-	cifs_small_buf_release(pSMB);
 
 	/* if session dead then we do not need to do ulogoff,
 		since server closed smb session, no sense reporting
@@ -1255,7 +1243,7 @@ SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
 	pSMB->ByteCount = cpu_to_le16(count);
 	/* long_op set to 1 to allow for oplock break timeouts */
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, 1);
+			(struct smb_hdr *)pSMBr, &bytes_returned, CIFS_LONG_OP);
 	cifs_stats_inc(&tcon->num_opens);
 	if (rc) {
 		cFYI(1, ("Error in Open = %d", rc));
@@ -1368,7 +1356,7 @@ CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
 	pSMB->ByteCount = cpu_to_le16(count);
 	/* long_op set to 1 to allow for oplock break timeouts */
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, 1);
+			(struct smb_hdr *)pSMBr, &bytes_returned, CIFS_LONG_OP);
 	cifs_stats_inc(&tcon->num_opens);
 	if (rc) {
 		cFYI(1, ("Error in Open = %d", rc));
@@ -1446,7 +1434,7 @@ CIFSSMBRead(const int xid, struct cifsTconInfo *tcon, const int netfid,
 	iov[0].iov_base = (char *)pSMB;
 	iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
 	rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovecs */,
-			 &resp_buf_type, 0 /* not long op */, 1 /* log err */ );
+			 &resp_buf_type, CIFS_STD_OP | CIFS_LOG_ERROR);
 	cifs_stats_inc(&tcon->num_reads);
 	pSMBr = (READ_RSP *)iov[0].iov_base;
 	if (rc) {
@@ -1665,7 +1653,7 @@ CIFSSMBWrite2(const int xid, struct cifsTconInfo *tcon,
 
 
 	rc = SendReceive2(xid, tcon->ses, iov, n_vec + 1, &resp_buf_type,
-			  long_op, 0 /* do not log STATUS code */ );
+			  long_op);
 	cifs_stats_inc(&tcon->num_writes);
 	if (rc) {
 		cFYI(1, ("Send error Write2 = %d", rc));
@@ -1707,7 +1695,7 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 	int timeout = 0;
 	__u16 count;
 
-	cFYI(1, ("In CIFSSMBLock - timeout %d numLock %d", waitFlag, numLock));
+	cFYI(1, ("CIFSSMBLock timeout %d numLock %d", waitFlag, numLock));
 	rc = small_smb_init(SMB_COM_LOCKING_ANDX, 8, tcon, (void **) &pSMB);
 
 	if (rc)
@@ -1716,10 +1704,10 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 	pSMBr = (LOCK_RSP *)pSMB; /* BB removeme BB */
 
 	if (lockType == LOCKING_ANDX_OPLOCK_RELEASE) {
-		timeout = -1; /* no response expected */
+		timeout = CIFS_ASYNC_OP; /* no response expected */
 		pSMB->Timeout = 0;
 	} else if (waitFlag == TRUE) {
-		timeout = 3;  /* blocking operation, no timeout */
+		timeout = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
 		pSMB->Timeout = cpu_to_le32(-1);/* blocking - do not time out */
 	} else {
 		pSMB->Timeout = 0;
@@ -1749,15 +1737,16 @@ CIFSSMBLock(const int xid, struct cifsTconInfo *tcon,
 	if (waitFlag) {
 		rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,
 			(struct smb_hdr *) pSMBr, &bytes_returned);
+		cifs_small_buf_release(pSMB);
 	} else {
-		rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, timeout);
+		rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *)pSMB,
+				      timeout);
+		/* SMB buffer freed by function above */
 	}
 	cifs_stats_inc(&tcon->num_locks);
 	if (rc) {
 		cFYI(1, ("Send error in Lock = %d", rc));
 	}
-	cifs_small_buf_release(pSMB);
 
 	/* Note: On -EAGAIN error only caller can retry on handle based calls
 	since file handle passed in no longer valid */
@@ -1776,7 +1765,9 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 	int rc = 0;
 	int timeout = 0;
 	int bytes_returned = 0;
+	int resp_buf_type = 0;
 	__u16 params, param_offset, offset, byte_count, count;
+	struct kvec iov[1];
 
 	cFYI(1, ("Posix Lock"));
 
@@ -1818,7 +1809,7 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 
 	parm_data->lock_type = cpu_to_le16(lock_type);
 	if (waitFlag) {
-		timeout = 3;  /* blocking operation, no timeout */
+		timeout = CIFS_BLOCKING_OP; /* blocking operation, no timeout */
 		parm_data->lock_flags = cpu_to_le16(1);
 		pSMB->Timeout = cpu_to_le32(-1);
 	} else
@@ -1838,8 +1829,13 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 		rc = SendReceiveBlockingLock(xid, tcon, (struct smb_hdr *) pSMB,
 			(struct smb_hdr *) pSMBr, &bytes_returned);
 	} else {
-		rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			(struct smb_hdr *) pSMBr, &bytes_returned, timeout);
+		iov[0].iov_base = (char *)pSMB;
+		iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
+		rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovecs */,
+				&resp_buf_type, timeout);
+		pSMB = NULL; /* request buf already freed by SendReceive2. Do
+				not try to free it twice below on exit */
+		pSMBr = (struct smb_com_transaction2_sfi_rsp *)iov[0].iov_base;
 	}
 
 	if (rc) {
@@ -1874,6 +1870,11 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 	if (pSMB)
 		cifs_small_buf_release(pSMB);
 
+	if (resp_buf_type == CIFS_SMALL_BUFFER)
+		cifs_small_buf_release(iov[0].iov_base);
+	else if (resp_buf_type == CIFS_LARGE_BUFFER)
+		cifs_buf_release(iov[0].iov_base);
+
 	/* Note: On -EAGAIN error only caller can retry on handle based calls
 	   since file handle passed in no longer valid */
 
@@ -1886,8 +1887,6 @@ CIFSSMBClose(const int xid, struct cifsTconInfo *tcon, int smb_file_id)
 {
 	int rc = 0;
 	CLOSE_REQ *pSMB = NULL;
-	CLOSE_RSP *pSMBr = NULL;
-	int bytes_returned;
 	cFYI(1, ("In CIFSSMBClose"));
 
 /* do not retry on dead session on close */
@@ -1897,13 +1896,10 @@ CIFSSMBClose(const int xid, struct cifsTconInfo *tcon, int smb_file_id)
 	if (rc)
 		return rc;
 
-	pSMBr = (CLOSE_RSP *)pSMB; /* BB removeme BB */
-
 	pSMB->FileID = (__u16) smb_file_id;
 	pSMB->LastWriteTime = 0xFFFFFFFF;
 	pSMB->ByteCount = 0;
-	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
 	cifs_stats_inc(&tcon->num_closes);
 	if (rc) {
 		if (rc != -EINTR) {
@@ -1912,8 +1908,6 @@ CIFSSMBClose(const int xid, struct cifsTconInfo *tcon, int smb_file_id)
 		}
 	}
 
-	cifs_small_buf_release(pSMB);
-
 	/* Since session is dead, file will be closed on server already */
 	if (rc == -EAGAIN)
 		rc = 0;
@@ -3102,7 +3096,7 @@ CIFSSMBGetCIFSACL(const int xid, struct cifsTconInfo *tcon, __u16 fid,
 	iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
 
 	rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovec */, &buf_type,
-			 0 /* not long op */, 0 /* do not log STATUS codes */ );
+			 CIFS_STD_OP);
 	cifs_stats_inc(&tcon->num_acl_get);
 	if (rc) {
 		cFYI(1, ("Send error in QuerySecDesc = %d", rc));
@@ -3763,8 +3757,6 @@ CIFSFindClose(const int xid, struct cifsTconInfo *tcon,
 {
 	int rc = 0;
 	FINDCLOSE_REQ *pSMB = NULL;
-	CLOSE_RSP *pSMBr = NULL; /* BB removeme BB */
-	int bytes_returned;
 
 	cFYI(1, ("In CIFSSMBFindClose"));
 	rc = small_smb_init(SMB_COM_FIND_CLOSE2, 1, tcon, (void **)&pSMB);
@@ -3776,16 +3768,13 @@ CIFSFindClose(const int xid, struct cifsTconInfo *tcon,
 	if (rc)
 		return rc;
 
-	pSMBr = (CLOSE_RSP *)pSMB;  /* BB removeme BB */
 	pSMB->FileID = searchHandle;
 	pSMB->ByteCount = 0;
-	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
 	if (rc) {
 		cERROR(1, ("Send error in FindClose = %d", rc));
 	}
 	cifs_stats_inc(&tcon->num_fclose);
-	cifs_small_buf_release(pSMB);
 
 	/* Since session is dead, search handle closed on server already */
 	if (rc == -EAGAIN)
@@ -4707,11 +4696,9 @@ CIFSSMBSetFileSize(const int xid, struct cifsTconInfo *tcon, __u64 size,
 		   __u16 fid, __u32 pid_of_opener, int SetAllocation)
 {
 	struct smb_com_transaction2_sfi_req *pSMB  = NULL;
-	struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
 	char *data_offset;
 	struct file_end_of_file_info *parm_data;
 	int rc = 0;
-	int bytes_returned = 0;
 	__u16 params, param_offset, offset, byte_count, count;
 
 	cFYI(1, ("SetFileSize (via SetFileInfo) %lld",
@@ -4721,8 +4708,6 @@ CIFSSMBSetFileSize(const int xid, struct cifsTconInfo *tcon, __u64 size,
 	if (rc)
 		return rc;
 
-	pSMBr = (struct smb_com_transaction2_sfi_rsp *)pSMB;
-
 	pSMB->hdr.Pid = cpu_to_le16((__u16)pid_of_opener);
 	pSMB->hdr.PidHigh = cpu_to_le16((__u16)(pid_of_opener >> 16));
 
@@ -4773,17 +4758,13 @@ CIFSSMBSetFileSize(const int xid, struct cifsTconInfo *tcon, __u64 size,
 	pSMB->Reserved4 = 0;
 	pSMB->hdr.smb_buf_length += byte_count;
 	pSMB->ByteCount = cpu_to_le16(byte_count);
-	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
 	if (rc) {
 		cFYI(1,
 		     ("Send error in SetFileInfo (SetFileSize) = %d",
 		      rc));
 	}
 
-	if (pSMB)
-		cifs_small_buf_release(pSMB);
-
 	/* Note: On -EAGAIN error only caller can retry on handle based calls
 		since file handle passed in no longer valid */
 
@@ -4801,10 +4782,8 @@ CIFSSMBSetFileTimes(const int xid, struct cifsTconInfo *tcon,
 		    const FILE_BASIC_INFO *data, __u16 fid)
 {
 	struct smb_com_transaction2_sfi_req *pSMB  = NULL;
-	struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
 	char *data_offset;
 	int rc = 0;
-	int bytes_returned = 0;
 	__u16 params, param_offset, offset, byte_count, count;
 
 	cFYI(1, ("Set Times (via SetFileInfo)"));
@@ -4813,8 +4792,6 @@ CIFSSMBSetFileTimes(const int xid, struct cifsTconInfo *tcon,
 	if (rc)
 		return rc;
 
-	pSMBr = (struct smb_com_transaction2_sfi_rsp *)pSMB;
-
 	/* At this point there is no need to override the current pid
 	with the pid of the opener, but that could change if we someday
 	use an existing handle (rather than opening one on the fly) */
@@ -4854,14 +4831,11 @@ CIFSSMBSetFileTimes(const int xid, struct cifsTconInfo *tcon,
 	pSMB->hdr.smb_buf_length += byte_count;
 	pSMB->ByteCount = cpu_to_le16(byte_count);
 	memcpy(data_offset, data, sizeof(FILE_BASIC_INFO));
-	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	rc = SendReceiveNoRsp(xid, tcon->ses, (struct smb_hdr *) pSMB, 0);
 	if (rc) {
 		cFYI(1, ("Send error in Set Time (SetFileInfo) = %d", rc));
 	}
 
-	cifs_small_buf_release(pSMB);
-
 	/* Note: On -EAGAIN error only caller can retry on handle based calls
 		since file handle passed in no longer valid */
 
@@ -5152,7 +5126,8 @@ int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon,
 	pSMB->ByteCount = 0;
 
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
-			(struct smb_hdr *) pSMBr, &bytes_returned, -1);
+			 (struct smb_hdr *)pSMBr, &bytes_returned,
+			 CIFS_ASYNC_OP);
 	if (rc) {
 		cFYI(1, ("Error in Notify = %d", rc));
 	} else {

fs/cifs/connect.c

@@ -438,9 +438,9 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
 			csocket = server->ssocket;
 			wake_up(&server->response_q);
 			continue;
-		} else if (length < 4) {
-			cFYI(1, ("less than four bytes received (%d bytes)",
-			      length));
+		} else if (length < pdu_length) {
+			cFYI(1, ("requested %d bytes but only got %d bytes",
+				  pdu_length, length));
 			pdu_length -= length;
 			msleep(1);
 			goto incomplete_rcv;
@@ -752,6 +752,7 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
 	}
 	write_unlock(&GlobalSMBSeslock);
 
+	kfree(server->hostname);
 	kfree(server);
 	if (length  > 0)
 		mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
@@ -760,6 +761,34 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
 	return 0;
 }
 
+/* extract the host portion of the UNC string */
+static char *
+extract_hostname(const char *unc)
+{
+	const char *src;
+	char *dst, *delim;
+	unsigned int len;
+
+	/* skip double chars at beginning of string */
+	/* BB: check validity of these bytes? */
+	src = unc + 2;
+
+	/* delimiter between hostname and sharename is always '\\' now */
+	delim = strchr(src, '\\');
+	if (!delim)
+		return ERR_PTR(-EINVAL);
+
+	len = delim - src;
+	dst = kmalloc((len + 1), GFP_KERNEL);
+	if (dst == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	memcpy(dst, src, len);
+	dst[len] = '\0';
+
+	return dst;
+}
+
 static int
 cifs_parse_mount_options(char *options, const char *devname,
 			 struct smb_vol *vol)
@@ -1781,11 +1810,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 	memset(&volume_info, 0, sizeof(struct smb_vol));
 	if (cifs_parse_mount_options(mount_data, devname, &volume_info)) {
-		kfree(volume_info.UNC);
-		kfree(volume_info.password);
-		kfree(volume_info.prepath);
-		FreeXid(xid);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	if (volume_info.nullauth) {
@@ -1798,11 +1824,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		cifserror("No username specified");
 	/* In userspace mount helper we can get user name from alternate
 	   locations such as env variables and files on disk */
-		kfree(volume_info.UNC);
-		kfree(volume_info.password);
-		kfree(volume_info.prepath);
-		FreeXid(xid);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	if (volume_info.UNCip && volume_info.UNC) {
@@ -1821,11 +1844,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 		if (rc <= 0) {
 			/* we failed translating address */
-			kfree(volume_info.UNC);
-			kfree(volume_info.password);
-			kfree(volume_info.prepath);
-			FreeXid(xid);
-			return -EINVAL;
+			rc = -EINVAL;
+			goto out;
 		}
 
 		cFYI(1, ("UNC: %s ip: %s", volume_info.UNC, volume_info.UNCip));
@@ -1835,20 +1855,14 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		/* BB using ip addr as server name to connect to the
 		   DFS root below */
 		cERROR(1, ("Connecting to DFS root not implemented yet"));
-		kfree(volume_info.UNC);
-		kfree(volume_info.password);
-		kfree(volume_info.prepath);
-		FreeXid(xid);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	} else /* which servers DFS root would we conect to */ {
 		cERROR(1,
 		       ("CIFS mount error: No UNC path (e.g. -o "
 			"unc=//192.168.1.100/public) specified"));
-		kfree(volume_info.UNC);
-		kfree(volume_info.password);
-		kfree(volume_info.prepath);
-		FreeXid(xid);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	/* this is needed for ASCII cp to Unicode converts */
@@ -1860,11 +1874,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		if (cifs_sb->local_nls == NULL) {
 			cERROR(1, ("CIFS mount error: iocharset %s not found",
 				 volume_info.iocharset));
-			kfree(volume_info.UNC);
-			kfree(volume_info.password);
-			kfree(volume_info.prepath);
-			FreeXid(xid);
-			return -ELIBACC;
+			rc = -ELIBACC;
+			goto out;
 		}
 	}
 
@@ -1878,11 +1889,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			&sin_server6.sin6_addr,
 			volume_info.username, &srvTcp);
 	} else {
-		kfree(volume_info.UNC);
-		kfree(volume_info.password);
-		kfree(volume_info.prepath);
-		FreeXid(xid);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	if (srvTcp) {
@@ -1906,22 +1914,14 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 				   "Aborting operation"));
 			if (csocket != NULL)
 				sock_release(csocket);
-			kfree(volume_info.UNC);
-			kfree(volume_info.password);
-			kfree(volume_info.prepath);
-			FreeXid(xid);
-			return rc;
+			goto out;
 		}
 
 		srvTcp = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
 		if (!srvTcp) {
 			rc = -ENOMEM;
 			sock_release(csocket);
-			kfree(volume_info.UNC);
-			kfree(volume_info.password);
-			kfree(volume_info.prepath);
-			FreeXid(xid);
-			return rc;
+			goto out;
 		} else {
 			memcpy(&srvTcp->addr.sockAddr, &sin_server,
 				sizeof(struct sockaddr_in));
@@ -1929,6 +1929,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			/* BB Add code for ipv6 case too */
 			srvTcp->ssocket = csocket;
 			srvTcp->protocolType = IPV4;
+			srvTcp->hostname = extract_hostname(volume_info.UNC);
+			if (IS_ERR(srvTcp->hostname)) {
+				rc = PTR_ERR(srvTcp->hostname);
+				sock_release(csocket);
+				goto out;
+			}
 			init_waitqueue_head(&srvTcp->response_q);
 			init_waitqueue_head(&srvTcp->request_q);
 			INIT_LIST_HEAD(&srvTcp->pending_mid_q);
@@ -1938,16 +1944,13 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			srvTcp->tcpStatus = CifsNew;
 			init_MUTEX(&srvTcp->tcpSem);
 			srvTcp->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread, srvTcp, "cifsd");
-			if ( IS_ERR(srvTcp->tsk) ) {
+			if (IS_ERR(srvTcp->tsk)) {
 				rc = PTR_ERR(srvTcp->tsk);
 				cERROR(1, ("error %d create cifsd thread", rc));
 				srvTcp->tsk = NULL;
 				sock_release(csocket);
-				kfree(volume_info.UNC);
-				kfree(volume_info.password);
-				kfree(volume_info.prepath);
-				FreeXid(xid);
-				return rc;
+				kfree(srvTcp->hostname);
+				goto out;
 			}
 			wait_for_completion(&cifsd_complete);
 			rc = 0;
@@ -1962,8 +1965,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	if (existingCifsSes) {
 		pSesInfo = existingCifsSes;
 		cFYI(1, ("Existing smb sess found"));
-		kfree(volume_info.password);
-		/* volume_info.UNC freed at end of function */
 	} else if (!rc) {
 		cFYI(1, ("Existing smb sess not found"));
 		pSesInfo = sesInfoAlloc();
@@ -1977,8 +1978,11 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 		if (!rc) {
 			/* volume_info.password freed at unmount */
-			if (volume_info.password)
+			if (volume_info.password) {
 				pSesInfo->password = volume_info.password;
+				/* set to NULL to prevent freeing on exit */
+				volume_info.password = NULL;
+			}
 			if (volume_info.username)
 				strncpy(pSesInfo->userName,
 					volume_info.username,
@@ -2000,8 +2004,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			up(&pSesInfo->sesSem);
 			if (!rc)
 				atomic_inc(&srvTcp->socketUseCount);
-		} else
-			kfree(volume_info.password);
+		}
 	}
 
 	/* search for existing tcon to this server share */
@@ -2106,9 +2109,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 						"", cifs_sb->local_nls,
 						cifs_sb->mnt_cifs_flags &
 						  CIFS_MOUNT_MAP_SPECIAL_CHR);
-					kfree(volume_info.UNC);
-					FreeXid(xid);
-					return -ENODEV;
+					rc = -ENODEV;
+					goto out;
 				} else {
 					/* BB Do we need to wrap sesSem around
 					 * this TCon call and Unix SetFS as
@@ -2231,6 +2233,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	(in which case it is not needed anymore) but when new sesion is created
 	the password ptr is put in the new session structure (in which case the
 	password will be freed at unmount time) */
+out:
+	/* zero out password before freeing */
+	if (volume_info.password != NULL) {
+		memset(volume_info.password, 0, strlen(volume_info.password));
+		kfree(volume_info.password);
+	}
 	kfree(volume_info.UNC);
 	kfree(volume_info.prepath);
 	FreeXid(xid);
@@ -2374,7 +2382,7 @@ CIFSSessSetup(unsigned int xid, struct cifsSesInfo *ses,
 	pSMB->req_no_secext.ByteCount = cpu_to_le16(count);
 
 	rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
-			 &bytes_returned, 1);
+			 &bytes_returned, CIFS_LONG_OP);
 	if (rc) {
 /* rc = map_smb_to_linux_error(smb_buffer_response); now done in SendReceive */
 	} else if ((smb_buffer_response->WordCount == 3)
@@ -2678,7 +2686,7 @@ CIFSNTLMSSPNegotiateSessSetup(unsigned int xid,
 	pSMB->req.ByteCount = cpu_to_le16(count);
 
 	rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
-			 &bytes_returned, 1);
+			 &bytes_returned, CIFS_LONG_OP);
 
 	if (smb_buffer_response->Status.CifsError ==
 	    cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
@@ -3105,7 +3113,7 @@ CIFSNTLMSSPAuthSessSetup(unsigned int xid, struct cifsSesInfo *ses,
 	pSMB->req.ByteCount = cpu_to_le16(count);
 
 	rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response,
-			 &bytes_returned, 1);
+			 &bytes_returned, CIFS_LONG_OP);
 	if (rc) {
 /*   rc = map_smb_to_linux_error(smb_buffer_response) done in SendReceive now */
 	} else if ((smb_buffer_response->WordCount == 3) ||
@@ -3381,7 +3389,8 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
 	pSMB->hdr.smb_buf_length += count;
 	pSMB->ByteCount = cpu_to_le16(count);
 
-	rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length, 0);
+	rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
+			 CIFS_STD_OP);
 
 	/* if (rc) rc = map_smb_to_linux_error(smb_buffer_response); */
 	/* above now done in SendReceive */

fs/cifs/file.c

@@ -130,7 +130,9 @@ static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
 		if (file->f_path.dentry->d_inode->i_mapping) {
 		/* BB no need to lock inode until after invalidate
 		   since namei code should already have it locked? */
-			filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
+			rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
+			if (rc != 0)
+				CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc;
 		}
 		cFYI(1, ("invalidating remote inode since open detected it "
 			 "changed"));
@@ -425,7 +427,9 @@ static int cifs_reopen_file(struct file *file, int can_flush)
 		pCifsInode = CIFS_I(inode);
 		if (pCifsInode) {
 			if (can_flush) {
-				filemap_write_and_wait(inode->i_mapping);
+				rc = filemap_write_and_wait(inode->i_mapping);
+				if (rc != 0)
+					CIFS_I(inode)->write_behind_rc = rc;
 			/* temporarily disable caching while we
 			   go to server to get inode info */
 				pCifsInode->clientCanCacheAll = FALSE;
@@ -835,9 +839,9 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 	xid = GetXid();
 
 	if (*poffset > file->f_path.dentry->d_inode->i_size)
-		long_op = 2; /* writes past end of file can take a long time */
+		long_op = CIFS_VLONG_OP; /* writes past EOF take long time */
 	else
-		long_op = 1;
+		long_op = CIFS_LONG_OP;
 
 	for (total_written = 0; write_size > total_written;
 	     total_written += bytes_written) {
@@ -884,7 +888,7 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 			}
 		} else
 			*poffset += bytes_written;
-		long_op = FALSE; /* subsequent writes fast -
+		long_op = CIFS_STD_OP; /* subsequent writes fast -
 				    15 seconds is plenty */
 	}
 
@@ -934,9 +938,9 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 	xid = GetXid();
 
 	if (*poffset > file->f_path.dentry->d_inode->i_size)
-		long_op = 2; /* writes past end of file can take a long time */
+		long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */
 	else
-		long_op = 1;
+		long_op = CIFS_LONG_OP;
 
 	for (total_written = 0; write_size > total_written;
 	     total_written += bytes_written) {
@@ -1002,7 +1006,7 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
 			}
 		} else
 			*poffset += bytes_written;
-		long_op = FALSE; /* subsequent writes fast -
+		long_op = CIFS_STD_OP; /* subsequent writes fast -
 				    15 seconds is plenty */
 	}
 
@@ -1360,13 +1364,16 @@ static int cifs_writepages(struct address_space *mapping,
 						   open_file->netfid,
 						   bytes_to_write, offset,
 						   &bytes_written, iov, n_iov,
-						   1);
+						   CIFS_LONG_OP);
 				atomic_dec(&open_file->wrtPending);
 				if (rc || bytes_written < bytes_to_write) {
 					cERROR(1, ("Write2 ret %d, wrote %d",
 						  rc, bytes_written));
 					/* BB what if continued retry is
 					   requested via mount flags? */
+					if (rc == -ENOSPC)
+						set_bit(AS_ENOSPC, &mapping->flags);
+					else
 						set_bit(AS_EIO, &mapping->flags);
 				} else {
 					cifs_stats_bytes_written(cifs_sb->tcon,
@@ -1499,9 +1506,11 @@ int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
 	cFYI(1, ("Sync file - name: %s datasync: 0x%x",
 		dentry->d_name.name, datasync));
 
-	rc = filemap_fdatawrite(inode->i_mapping);
-	if (rc == 0)
+	rc = filemap_write_and_wait(inode->i_mapping);
+	if (rc == 0) {
+		rc = CIFS_I(inode)->write_behind_rc;
 		CIFS_I(inode)->write_behind_rc = 0;
+	}
 	FreeXid(xid);
 	return rc;
 }
@@ -1553,8 +1562,11 @@ int cifs_flush(struct file *file, fl_owner_t id)
 	   filemapfdatawrite appears easier for the time being */
 
 	rc = filemap_fdatawrite(inode->i_mapping);
-	if (!rc) /* reset wb rc if we were able to write out dirty pages */
+	/* reset wb rc if we were able to write out dirty pages */
+	if (!rc) {
+		rc = CIFS_I(inode)->write_behind_rc;
 		CIFS_I(inode)->write_behind_rc = 0;
+	}
 
 	cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc));
 

fs/cifs/inode.c

@@ -1233,7 +1233,7 @@ int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
 int cifs_revalidate(struct dentry *direntry)
 {
 	int xid;
-	int rc = 0;
+	int rc = 0, wbrc = 0;
 	char *full_path;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsInodeInfo *cifsInode;
@@ -1333,7 +1333,9 @@ int cifs_revalidate(struct dentry *direntry)
 	if (direntry->d_inode->i_mapping) {
 		/* do we need to lock inode until after invalidate completes
 		   below? */
-		filemap_fdatawrite(direntry->d_inode->i_mapping);
+		wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
+		if (wbrc)
+			CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
 	}
 	if (invalidate_inode) {
 	/* shrink_dcache not necessary now that cifs dentry ops
@@ -1342,7 +1344,9 @@ int cifs_revalidate(struct dentry *direntry)
 			shrink_dcache_parent(direntry); */
 		if (S_ISREG(direntry->d_inode->i_mode)) {
 			if (direntry->d_inode->i_mapping)
-				filemap_fdatawait(direntry->d_inode->i_mapping);
+				wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
+				if (wbrc)
+					CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
 			/* may eventually have to do this for open files too */
 			if (list_empty(&(cifsInode->openFileList))) {
 				/* changed on server - flush read ahead pages */
@@ -1485,10 +1489,20 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
 
 	/* BB check if we need to refresh inode from server now ? BB */
 
-	/* need to flush data before changing file size on server */
-	filemap_write_and_wait(direntry->d_inode->i_mapping);
-
 	if (attrs->ia_valid & ATTR_SIZE) {
+		/*
+		   Flush data before changing file size on server. If the
+		   flush returns error, store it to report later and continue.
+		   BB: This should be smarter. Why bother flushing pages that
+		   will be truncated anyway? Also, should we error out here if
+		   the flush returns error?
+		 */
+		rc = filemap_write_and_wait(direntry->d_inode->i_mapping);
+		if (rc != 0) {
+			CIFS_I(direntry->d_inode)->write_behind_rc = rc;
+			rc = 0;
+		}
+
 		/* To avoid spurious oplock breaks from server, in the case of
 		   inodes that we already have open, avoid doing path based
 		   setting of file size if we can do it by handle.

fs/cifs/sess.c

@@ -29,6 +29,7 @@
 #include "ntlmssp.h"
 #include "nterr.h"
 #include <linux/utsname.h>
+#include "cifs_spnego.h"
 
 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
 			 unsigned char *p24);
@@ -340,11 +341,12 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 	SESSION_SETUP_ANDX *pSMB;
 	__u32 capabilities;
 	int count;
-	int resp_buf_type = 0;
-	struct kvec iov[2];
+	int resp_buf_type;
+	struct kvec iov[3];
 	enum securityEnum type;
 	__u16 action;
 	int bytes_remaining;
+	struct key *spnego_key = NULL;
 
 	if (ses == NULL)
 		return -EINVAL;
@@ -377,24 +379,32 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 
 	capabilities = cifs_ssetup_hdr(ses, pSMB);
 
-	/* we will send the SMB in two pieces,
-	a fixed length beginning part, and a
-	second part which will include the strings
-	and rest of bcc area, in order to avoid having
-	to do a large buffer 17K allocation */
+	/* we will send the SMB in three pieces:
+	a fixed length beginning part, an optional
+	SPNEGO blob (which can be zero length), and a
+	last part which will include the strings
+	and rest of bcc area. This allows us to avoid
+	a large buffer 17K allocation */
 	iov[0].iov_base = (char *)pSMB;
 	iov[0].iov_len = smb_buf->smb_buf_length + 4;
 
+	/* setting this here allows the code at the end of the function
+	   to free the request buffer if there's an error */
+	resp_buf_type = CIFS_SMALL_BUFFER;
+
 	/* 2000 big enough to fit max user, domain, NOS name etc. */
 	str_area = kmalloc(2000, GFP_KERNEL);
 	if (str_area == NULL) {
-		cifs_small_buf_release(smb_buf);
-		return -ENOMEM;
+		rc = -ENOMEM;
+		goto ssetup_exit;
 	}
 	bcc_ptr = str_area;
 
 	ses->flags &= ~CIFS_SES_LANMAN;
 
+	iov[1].iov_base = NULL;
+	iov[1].iov_len = 0;
+
 	if (type == LANMAN) {
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 		char lnm_session_key[CIFS_SESS_KEY_SIZE];
@@ -463,8 +473,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 		   struct ntlmv2_resp */
 
 		if (v2_sess_key == NULL) {
-			cifs_small_buf_release(smb_buf);
-			return -ENOMEM;
+			rc = -ENOMEM;
+			goto ssetup_exit;
 		}
 
 		pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
@@ -499,22 +509,67 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 			unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
 		} else
 			ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
-	} else /* NTLMSSP or SPNEGO */ {
+	} else if (type == Kerberos) {
+#ifdef CONFIG_CIFS_UPCALL
+		struct cifs_spnego_msg *msg;
+		spnego_key = cifs_get_spnego_key(ses);
+		if (IS_ERR(spnego_key)) {
+			rc = PTR_ERR(spnego_key);
+			spnego_key = NULL;
+			goto ssetup_exit;
+		}
+
+		msg = spnego_key->payload.data;
+		/* bail out if key is too long */
+		if (msg->sesskey_len >
+		    sizeof(ses->server->mac_signing_key.data.krb5)) {
+			cERROR(1, ("Kerberos signing key too long (%u bytes)",
+				msg->sesskey_len));
+			rc = -EOVERFLOW;
+			goto ssetup_exit;
+		}
+		ses->server->mac_signing_key.len = msg->sesskey_len;
+		memcpy(ses->server->mac_signing_key.data.krb5, msg->data,
+			msg->sesskey_len);
 		pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
 		capabilities |= CAP_EXTENDED_SECURITY;
 		pSMB->req.Capabilities = cpu_to_le32(capabilities);
-		/* BB set password lengths */
+		iov[1].iov_base = msg->data + msg->sesskey_len;
+		iov[1].iov_len = msg->secblob_len;
+		pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
+
+		if (ses->capabilities & CAP_UNICODE) {
+			/* unicode strings must be word aligned */
+			if (iov[0].iov_len % 2) {
+				*bcc_ptr = 0;
+				bcc_ptr++;
 			}
+			unicode_oslm_strings(&bcc_ptr, nls_cp);
+			unicode_domain_string(&bcc_ptr, ses, nls_cp);
+		} else
+		/* BB: is this right? */
+			ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
+#else /* ! CONFIG_CIFS_UPCALL */
+		cERROR(1, ("Kerberos negotiated but upcall support disabled!"));
+		rc = -ENOSYS;
+		goto ssetup_exit;
+#endif /* CONFIG_CIFS_UPCALL */
+	} else {
+		cERROR(1, ("secType %d not supported!", type));
+		rc = -ENOSYS;
+		goto ssetup_exit;
+	}
+
+	iov[2].iov_base = str_area;
+	iov[2].iov_len = (long) bcc_ptr - (long) str_area;
 
-	count = (long) bcc_ptr - (long) str_area;
+	count = iov[1].iov_len + iov[2].iov_len;
 	smb_buf->smb_buf_length += count;
 
 	BCC_LE(smb_buf) = cpu_to_le16(count);
 
-	iov[1].iov_base = str_area;
-	iov[1].iov_len = count;
-	rc = SendReceive2(xid, ses, iov, 2 /* num_iovecs */, &resp_buf_type,
-			  0 /* not long op */, 1 /* log NT STATUS if any */ );
+	rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
+			  CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
 	/* SMB request buf freed in SendReceive2 */
 
 	cFYI(1, ("ssetup rc from sendrecv2 is %d", rc));
@@ -560,6 +615,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 					 ses, nls_cp);
 
 ssetup_exit:
+	if (spnego_key)
+		key_put(spnego_key);
 	kfree(str_area);
 	if (resp_buf_type == CIFS_SMALL_BUFFER) {
 		cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base));

fs/cifs/transport.c

@@ -308,7 +308,7 @@ smb_send2(struct socket *ssocket, struct kvec *iov, int n_vec,
 
 static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op)
 {
-	if (long_op == -1) {
+	if (long_op == CIFS_ASYNC_OP) {
 		/* oplock breaks must not be held up */
 		atomic_inc(&ses->server->inFlight);
 	} else {
@@ -337,7 +337,7 @@ static int wait_for_free_request(struct cifsSesInfo *ses, const int long_op)
 				   as they are allowed to block on server */
 
 				/* update # of requests on the wire to server */
-				if (long_op < 3)
+				if (long_op != CIFS_BLOCKING_OP)
 					atomic_inc(&ses->server->inFlight);
 				spin_unlock(&GlobalMid_Lock);
 				break;
@@ -415,17 +415,48 @@ static int wait_for_response(struct cifsSesInfo *ses,
 	}
 }
 
+
+/*
+ *
+ * Send an SMB Request.  No response info (other than return code)
+ * needs to be parsed.
+ *
+ * flags indicate the type of request buffer and how long to wait
+ * and whether to log NT STATUS code (error) before mapping it to POSIX error
+ *
+ */
+int
+SendReceiveNoRsp(const unsigned int xid, struct cifsSesInfo *ses,
+		struct smb_hdr *in_buf, int flags)
+{
+	int rc;
+	struct kvec iov[1];
+	int resp_buf_type;
+
+	iov[0].iov_base = (char *)in_buf;
+	iov[0].iov_len = in_buf->smb_buf_length + 4;
+	flags |= CIFS_NO_RESP;
+	rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags);
+#ifdef CONFIG_CIFS_DEBUG2
+	cFYI(1, ("SendRcvNoR flags %d rc %d", flags, rc));
+#endif
+	return rc;
+}
+
 int
 SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 	     struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
-	     const int long_op, const int logError)
+	     const int flags)
 {
 	int rc = 0;
+	int long_op;
 	unsigned int receive_len;
 	unsigned long timeout;
 	struct mid_q_entry *midQ;
 	struct smb_hdr *in_buf = iov[0].iov_base;
 
+	long_op = flags & CIFS_TIMEOUT_MASK;
+
 	*pRespBufType = CIFS_NO_BUFFER;  /* no response buf yet */
 
 	if ((ses == NULL) || (ses->server == NULL)) {
@@ -483,15 +514,22 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 	if (rc < 0)
 		goto out;
 
-	if (long_op == -1)
-		goto out;
-	else if (long_op == 2) /* writes past end of file can take loong time */
+	if (long_op == CIFS_STD_OP)
+		timeout = 15 * HZ;
+	else if (long_op == CIFS_VLONG_OP) /* e.g. slow writes past EOF */
 		timeout = 180 * HZ;
-	else if (long_op == 1)
+	else if (long_op == CIFS_LONG_OP)
 		timeout = 45 * HZ; /* should be greater than
 			servers oplock break timeout (about 43 seconds) */
-	else
-		timeout = 15 * HZ;
+	else if (long_op == CIFS_ASYNC_OP)
+		goto out;
+	else if (long_op == CIFS_BLOCKING_OP)
+		timeout = 0x7FFFFFFF; /*  large, but not so large as to wrap */
+	else {
+		cERROR(1, ("unknown timeout flag %d", long_op));
+		rc = -EIO;
+		goto out;
+	}
 
 	/* wait for 15 seconds or until woken up due to response arriving or
 	   due to last connection to this server being unmounted */
@@ -566,7 +604,8 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 			}
 
 			/* BB special case reconnect tid and uid here? */
-			rc = map_smb_to_linux_error(midQ->resp_buf, logError);
+			rc = map_smb_to_linux_error(midQ->resp_buf,
+						flags & CIFS_LOG_ERROR);
 
 			/* convert ByteCount if necessary */
 			if (receive_len >= sizeof(struct smb_hdr) - 4
@@ -574,8 +613,10 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 			    (2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
 				BCC(midQ->resp_buf) =
 					le16_to_cpu(BCC_LE(midQ->resp_buf));
-			midQ->resp_buf = NULL;  /* mark it so will not be freed
-						by DeleteMidQEntry */
+			if ((flags & CIFS_NO_RESP) == 0)
+				midQ->resp_buf = NULL;  /* mark it so buf will
+							   not be freed by
+							   DeleteMidQEntry */
 		} else {
 			rc = -EIO;
 			cFYI(1, ("Bad MID state?"));
@@ -663,17 +704,25 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 	if (rc < 0)
 		goto out;
 
-	if (long_op == -1)
+	if (long_op == CIFS_STD_OP)
+		timeout = 15 * HZ;
+	/* wait for 15 seconds or until woken up due to response arriving or
+	   due to last connection to this server being unmounted */
+	else if (long_op == CIFS_ASYNC_OP)
 		goto out;
-	else if (long_op == 2) /* writes past end of file can take loong time */
+	else if (long_op == CIFS_VLONG_OP) /* writes past EOF can be slow */
 		timeout = 180 * HZ;
-	else if (long_op == 1)
+	else if (long_op == CIFS_LONG_OP)
 		timeout = 45 * HZ; /* should be greater than
 			servers oplock break timeout (about 43 seconds) */
-	else
-		timeout = 15 * HZ;
-	/* wait for 15 seconds or until woken up due to response arriving or
-	   due to last connection to this server being unmounted */
+	else if (long_op == CIFS_BLOCKING_OP)
+		timeout = 0x7FFFFFFF; /* large but no so large as to wrap */
+	else {
+		cERROR(1, ("unknown timeout flag %d", long_op));
+		rc = -EIO;
+		goto out;
+	}
+
 	if (signal_pending(current)) {
 		/* if signal pending do not hold up user for full smb timeout
 		but we still give response a chance to complete */
@@ -812,7 +861,7 @@ send_lock_cancel(const unsigned int xid, struct cifsTconInfo *tcon,
 	pSMB->hdr.Mid = GetNextMid(ses->server);
 
 	return SendReceive(xid, ses, in_buf, out_buf,
-			&bytes_returned, 0);
+			&bytes_returned, CIFS_STD_OP);
 }
 
 int
@@ -844,7 +893,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
 	   to the same server. We may make this configurable later or
 	   use ses->maxReq */
 
-	rc = wait_for_free_request(ses, 3);
+	rc = wait_for_free_request(ses, CIFS_BLOCKING_OP);
 	if (rc)
 		return rc;