[CIFS] Add worker function for Get ACL cifs style

Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/CHANGES

@@ -1,7 +1,9 @@
 Version 1.40
 ------------
 Use fsuid (fsgid) more consistently instead of uid (gid). Improve performance
-of readpages by eliminating one extra memcpy.
+of readpages by eliminating one extra memcpy. Allow update of file size
+from remote server even if file is open for write as long as mount is
+directio.
 
 Version 1.39
 ------------

fs/cifs/cifs_fs_sb.h

@@ -27,6 +27,7 @@
 #define CIFS_MOUNT_POSIX_PATHS	0x40 /* Negotiate posix pathnames if possible. */
 #define CIFS_MOUNT_UNX_EMUL	0x80 /* Network compat with SFUnix emulation */
 #define CIFS_MOUNT_NO_BRL	0x100 /* No sending byte range locks to srv */
+#define CIFS_MOUNT_CIFS_ACL	0x200 /* send ACL requests to non-POSIX srv */
 
 struct cifs_sb_info {
 	struct cifsTconInfo *tcon;	/* primary mount */

fs/cifs/cifsglob.h

@@ -233,6 +233,8 @@ struct cifsTconInfo {
 	atomic_t num_hardlinks;
 	atomic_t num_symlinks;
 	atomic_t num_locks;
+	atomic_t num_acl_get;
+	atomic_t num_acl_set;
 #ifdef CONFIG_CIFS_STATS2
 	unsigned long long time_writes;
 	unsigned long long time_reads;

fs/cifs/cifspdu.h

@@ -528,7 +528,7 @@ typedef union smb_com_session_setup_andx {
 		/* STRING PrimaryDomain */
 		/* STRING NativeOS */
 		/* STRING NativeLanMan */
-	} __attribute__((packed)) old_req;		/* pre-NTLM (LANMAN2.1) request format */
+	} __attribute__((packed)) old_req; /* pre-NTLM (LANMAN2.1) req format */
 
 	struct {		/* default (NTLM) response format */
 		struct smb_hdr hdr;	/* wct = 3 */
@@ -540,7 +540,7 @@ typedef union smb_com_session_setup_andx {
 		unsigned char NativeOS[1];	/* followed by */
 /*	unsigned char * NativeLanMan; */
 /*      unsigned char * PrimaryDomain; */
-	} __attribute__((packed)) old_resp;		/* pre-NTLM (LANMAN2.1) response format */
+	} __attribute__((packed)) old_resp; /* pre-NTLM (LANMAN2.1) response */
 } __attribute__((packed)) SESSION_SETUP_ANDX;
 
 #define CIFS_NETWORK_OPSYS "CIFS VFS Client for Linux"
@@ -1007,10 +1007,49 @@ typedef struct smb_com_setattr_rsp {
 
 /* empty wct response to setattr */
 
-/***************************************************/
+/*******************************************************/
 /* NT Transact structure defintions follow             */
-/* Currently only ioctl and notify are implemented */
+/* Currently only ioctl, acl (get security descriptor) */  
-/***************************************************/
+/* and notify are implemented                          */
+/*******************************************************/
+typedef struct smb_com_ntransact_req {
+        struct smb_hdr hdr; /* wct >= 19 */
+        __u8 MaxSetupCount;
+        __u16 Reserved;
+        __le32 TotalParameterCount;
+        __le32 TotalDataCount;
+        __le32 MaxParameterCount;
+        __le32 MaxDataCount;
+        __le32 ParameterCount;
+        __le32 ParameterOffset;
+        __le32 DataCount;
+        __le32 DataOffset;
+        __u8 SetupCount; /* four setup words follow subcommand */
+        /* SNIA spec incorrectly included spurious pad here */
+        __le16 SubCommand; /* 2 = IOCTL/FSCTL */
+	/* SetupCount words follow then */ 
+        __le16 ByteCount;
+        __u8 Pad[3];
+        __u8 Parms[0];
+} __attribute__((packed)) NTRANSACT_REQ;
+
+typedef struct smb_com_ntransact_rsp {
+	struct smb_hdr hdr;     /* wct = 18 */
+	__u8 Reserved[3];
+	__le32 TotalParameterCount;
+	__le32 TotalDataCount;
+	__le32 ParameterCount;
+	__le32 ParameterOffset;
+	__le32 ParameterDisplacement;
+	__le32 DataCount;
+	__le32 DataOffset;
+	__le32 DataDisplacement;
+	__u8 SetupCount;   /* 0 */
+	__u16 ByteCount;
+        /* __u8 Pad[3]; */
+	/* parms and data follow */
+} __attribute__((packed)) NTRANSACT_RSP;
+
 typedef struct smb_com_transaction_ioctl_req {
 	struct smb_hdr hdr;	/* wct = 23 */
 	__u8 MaxSetupCount;
@@ -1028,8 +1067,8 @@ typedef struct smb_com_transaction_ioctl_req {
 	__le16 SubCommand; /* 2 = IOCTL/FSCTL */
 	__le32 FunctionCode;
 	__u16 Fid;
-	__u8 IsFsctl;    /* 1 = File System Control, 0 = device control (IOCTL)*/
+	__u8 IsFsctl;  /* 1 = File System Control 0 = device control (IOCTL) */
-	__u8 IsRootFlag; /* 1 = apply command to root of share (must be DFS share)*/
+	__u8 IsRootFlag; /* 1 = apply command to root of share (must be DFS) */
 	__le16 ByteCount;
 	__u8 Pad[3];
 	__u8 Data[1];
@@ -1049,9 +1088,35 @@ typedef struct smb_com_transaction_ioctl_rsp {
 	__u8 SetupCount;	/* 1 */
 	__le16 ReturnedDataLen;
 	__u16 ByteCount;
-	__u8 Pad[3];
 } __attribute__((packed)) TRANSACT_IOCTL_RSP;
 
+#define CIFS_ACL_OWNER 1
+#define CIFS_ACL_GROUP 2
+#define CIFS_ACL_DACL  4
+#define CIFS_ACL_SACL  8
+
+typedef struct smb_com_transaction_qsec_req {
+	struct smb_hdr hdr;     /* wct = 19 */
+	__u8 MaxSetupCount;
+	__u16 Reserved;
+	__le32 TotalParameterCount;
+	__le32 TotalDataCount;
+	__le32 MaxParameterCount;
+	__le32 MaxDataCount;
+	__le32 ParameterCount;
+	__le32 ParameterOffset;
+	__le32 DataCount;
+	__le32 DataOffset;
+	__u8 SetupCount; /* no setup words follow subcommand */
+	/* SNIA spec incorrectly included spurious pad here */
+	__le16 SubCommand; /* 6 = QUERY_SECURITY_DESC */
+	__le16 ByteCount; /* bcc = 3 + 8 */
+	__u8 Pad[3];
+	__u16 Fid;
+	__u16 Reserved2;
+	__le32 AclFlags;
+} __attribute__((packed)) QUERY_SEC_DESC_REQ;
+
 typedef struct smb_com_transaction_change_notify_req {
 	struct smb_hdr hdr;     /* wct = 23 */
 	__u8 MaxSetupCount;
@@ -1076,6 +1141,8 @@ typedef struct smb_com_transaction_change_notify_req {
 /*	__u8 Data[1];*/
 } __attribute__((packed)) TRANSACT_CHANGE_NOTIFY_REQ;
 
+/* BB eventually change to use generic ntransact rsp struct 
+      and validation routine */
 typedef struct smb_com_transaction_change_notify_rsp {
 	struct smb_hdr hdr;	/* wct = 18 */
 	__u8 Reserved[3];

fs/cifs/cifsproto.h

@@ -299,6 +299,9 @@ extern int CIFSSMBSetEA(const int xid, struct cifsTconInfo *tcon,
 		const char *fileName, const char * ea_name, 
 		const void * ea_value, const __u16 ea_value_len, 
 		const struct nls_table *nls_codepage, int remap_special_chars);
+extern int CIFSSMBGetCIFSACL(const int xid, struct cifsTconInfo *tcon,
+			__u16 fid, char *acl_inf, const int buflen,
+			const int acl_type /* ACCESS vs. DEFAULT */);
 extern int CIFSSMBGetPosixACL(const int xid, struct cifsTconInfo *tcon,
 		const unsigned char *searchName,
 		char *acl_inf, const int buflen,const int acl_type,

fs/cifs/cifssmb.c

@@ -1926,6 +1926,90 @@ querySymLinkRetry:
 	return rc;
 }
 
+/* Initialize NT TRANSACT SMB into small smb request buffer.
+   This assumes that all NT TRANSACTS that we init here have
+   total parm and data under about 400 bytes (to fit in small cifs
+   buffer size), which is the case so far, it easily fits. NB:
+	Setup words themselves and ByteCount
+	MaxSetupCount (size of returned setup area) and
+	MaxParameterCount (returned parms size) must be set by caller */
+static int 
+smb_init_ntransact(const __u16 sub_command, const int setup_count,
+		   const int parm_len, struct cifsTconInfo *tcon,
+		   void ** ret_buf)
+{
+	int rc;
+	__u32 temp_offset;
+	struct smb_com_ntransact_req * pSMB;
+
+	rc = small_smb_init(SMB_COM_NT_TRANSACT, 19 + setup_count, tcon,
+				(void **)&pSMB);
+	if (rc)
+		return rc;
+	*ret_buf = (void *)pSMB;
+	pSMB->Reserved = 0;
+	pSMB->TotalParameterCount = cpu_to_le32(parm_len);
+	pSMB->TotalDataCount  = 0;
+	pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
+					  MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+	pSMB->ParameterCount = pSMB->TotalParameterCount;
+	pSMB->DataCount  = pSMB->TotalDataCount;
+	temp_offset = offsetof(struct smb_com_ntransact_req, Parms) +
+			(setup_count * 2) - 4 /* for rfc1001 length itself */;
+	pSMB->ParameterOffset = cpu_to_le32(temp_offset);
+	pSMB->DataOffset = cpu_to_le32(temp_offset + parm_len);
+	pSMB->SetupCount = setup_count; /* no need to le convert byte fields */
+	pSMB->SubCommand = cpu_to_le16(sub_command);
+	return 0;
+}
+
+static int
+validate_ntransact(char * buf, char ** ppparm, char ** ppdata,
+		   int * pdatalen, int * pparmlen)
+{
+	char * end_of_smb;
+	__u32 data_count, data_offset, parm_count, parm_offset;
+	struct smb_com_ntransact_rsp * pSMBr;
+
+	if(buf == NULL)
+		return -EINVAL;
+
+	pSMBr = (struct smb_com_ntransact_rsp *)buf;
+
+	/* ByteCount was converted from little endian in SendReceive */
+	end_of_smb = 2 /* sizeof byte count */ + pSMBr->ByteCount + 
+			(char *)&pSMBr->ByteCount;
+
+		
+	data_offset = le32_to_cpu(pSMBr->DataOffset);
+	data_count = le32_to_cpu(pSMBr->DataCount);
+        parm_offset = le32_to_cpu(pSMBr->ParameterOffset);
+	parm_count = le32_to_cpu(pSMBr->ParameterCount);
+
+	*ppparm = (char *)&pSMBr->hdr.Protocol + parm_offset;
+	*ppdata = (char *)&pSMBr->hdr.Protocol + data_offset;
+
+	/* should we also check that parm and data areas do not overlap? */
+	if(*ppparm > end_of_smb) {
+		cFYI(1,("parms start after end of smb"));
+		return -EINVAL;
+	} else if(parm_count + *ppparm > end_of_smb) {
+		cFYI(1,("parm end after end of smb"));
+		return -EINVAL;
+	} else if(*ppdata > end_of_smb) {
+		cFYI(1,("data starts after end of smb"));
+		return -EINVAL;
+	} else if(data_count + *ppdata > end_of_smb) {
+		cFYI(1,("data %p + count %d (%p) ends after end of smb %p start %p",
+			*ppdata, data_count, (data_count + *ppdata), end_of_smb, pSMBr));  /* BB FIXME */
+		return -EINVAL;
+	} else if(parm_count + data_count > pSMBr->ByteCount) {
+		cFYI(1,("parm count and data count larger than SMB"));
+		return -EINVAL;
+	}
+	return 0;
+}
+
 int
 CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
 			const unsigned char *searchName,
@@ -1948,7 +2032,8 @@ CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
 	pSMB->TotalDataCount = 0;
 	pSMB->MaxParameterCount = cpu_to_le32(2);
 	/* BB find exact data count max from sess structure BB */
-	pSMB->MaxDataCount = cpu_to_le32(4000);
+	pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
+					  MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
 	pSMB->MaxSetupCount = 4;
 	pSMB->Reserved = 0;
 	pSMB->ParameterOffset = 0;
@@ -1975,7 +2060,9 @@ CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
 			rc = -EIO;	/* bad smb */
 		else {
 			if(data_count && (data_count < 2048)) {
-				char * end_of_smb = pSMBr->ByteCount + (char *)&pSMBr->ByteCount;
+				char * end_of_smb = 2 /* sizeof byte count */ +
+						pSMBr->ByteCount +
+						(char *)&pSMBr->ByteCount;
 
 				struct reparse_data * reparse_buf = (struct reparse_data *)
 					((char *)&pSMBr->hdr.Protocol + data_offset);
@@ -2219,6 +2306,7 @@ queryAclRetry:
 
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
 		(struct smb_hdr *) pSMBr, &bytes_returned, 0);
+	cifs_stats_inc(&tcon->num_acl_get);
 	if (rc) {
 		cFYI(1, ("Send error in Query POSIX ACL = %d", rc));
 	} else {
@@ -2406,6 +2494,87 @@ GetExtAttrOut:
 
 #endif /* CONFIG_POSIX */
 
+/* Convert CIFS ACL to POSIX form */
+static int parse_sec_desc(struct sec_desc * psec_desc, int acl_len)
+{
+	CHECK ON OTHER COMPUTER TO SEE IF FORMAT ENCODED IN CIFSPDU.H ALREADY
+	return 0;
+}
+
+/* Get Security Descriptor (by handle) from remote server for a file or dir */
+int
+CIFSSMBGetCIFSACL(const int xid, struct cifsTconInfo *tcon, __u16 fid,
+         /*  BB fix up return info */ char *acl_inf, const int buflen, 
+		  const int acl_type /* ACCESS/DEFAULT not sure implication */)
+{
+	int rc = 0;
+	int buf_type = 0;
+	QUERY_SEC_DESC_REQ * pSMB;
+	struct kvec iov[1];
+
+	cFYI(1, ("GetCifsACL"));
+
+	rc = smb_init_ntransact(NT_TRANSACT_QUERY_SECURITY_DESC, 0, 
+			8 /* parm len */, tcon, (void **) &pSMB);
+	if (rc)
+		return rc;
+
+	pSMB->MaxParameterCount = cpu_to_le32(4);
+	/* BB TEST with big acls that might need to be e.g. larger than 16K */
+	pSMB->MaxSetupCount = 0;
+	pSMB->Fid = fid; /* file handle always le */
+	pSMB->AclFlags = cpu_to_le32(CIFS_ACL_OWNER | CIFS_ACL_GROUP |
+				     CIFS_ACL_DACL);
+	pSMB->ByteCount = cpu_to_le16(11); /* 3 bytes pad + 8 bytes parm */
+	pSMB->hdr.smb_buf_length += 11;
+	iov[0].iov_base = (char *)pSMB;
+	iov[0].iov_len = pSMB->hdr.smb_buf_length + 4;
+
+	rc = SendReceive2(xid, tcon->ses, iov, 1 /* num iovec */, &buf_type, 0);
+	cifs_stats_inc(&tcon->num_acl_get);
+	if (rc) {
+		cFYI(1, ("Send error in QuerySecDesc = %d", rc));
+	} else {                /* decode response */
+		struct sec_desc * psec_desc;
+		__le32 * parm;
+		int parm_len;
+		int data_len;
+		int acl_len;
+		struct smb_com_ntransact_rsp * pSMBr;
+
+/* validate_nttransact */
+		rc = validate_ntransact(iov[0].iov_base, (char **)&parm, 
+					(char **)&psec_desc,
+					&parm_len, &data_len);
+		
+		if(rc)
+			goto qsec_out;
+		pSMBr = (struct smb_com_ntransact_rsp *)iov[0].iov_base;
+
+		cERROR(1,("smb %p parm %p data %p",pSMBr,parm,psec_desc));  /* BB removeme BB */
+
+		if (le32_to_cpu(pSMBr->ParameterCount) != 4) {
+			rc = -EIO;      /* bad smb */
+			goto qsec_out;
+		}
+
+/* BB check that data area is minimum length and as big as acl_len */
+
+		acl_len = le32_to_cpu(*(__le32 *)parm);
+		/* BB check if(acl_len > bufsize) */
+
+		parse_sec_desc(psec_desc, acl_len);
+	}
+qsec_out:
+	if(buf_type == CIFS_SMALL_BUFFER)
+		cifs_small_buf_release(iov[0].iov_base);
+	else if(buf_type == CIFS_LARGE_BUFFER)
+		cifs_buf_release(iov[0].iov_base);
+	cifs_small_buf_release(pSMB);
+	return rc;
+}
+
+
 /* Legacy Query Path Information call for lookup to old servers such
    as Win9x/WinME */
 int SMBQueryInformation(const int xid, struct cifsTconInfo *tcon,
@@ -4304,7 +4473,7 @@ int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon,
 {
 	int rc = 0;
 	struct smb_com_transaction_change_notify_req * pSMB = NULL;
-	struct smb_com_transaction_change_notify_rsp * pSMBr = NULL;
+	struct smb_com_ntransaction_change_notify_rsp * pSMBr = NULL;
 	struct dir_notify_req *dnotify_req;
 	int bytes_returned;
 
@@ -4319,6 +4488,10 @@ int CIFSSMBNotify(const int xid, struct cifsTconInfo *tcon,
 	pSMB->MaxParameterCount = cpu_to_le32(2);
 	/* BB find exact data count max from sess structure BB */
 	pSMB->MaxDataCount = 0; /* same in little endian or be */
+/* BB VERIFY verify which is correct for above BB */
+	pSMB->MaxDataCount = cpu_to_le32((tcon->ses->server->maxBuf -
+					     MAX_CIFS_HDR_SIZE) & 0xFFFFFF00);
+
 	pSMB->MaxSetupCount = 4;
 	pSMB->Reserved = 0;
 	pSMB->ParameterOffset = 0;

fs/cifs/connect.c

@@ -76,6 +76,7 @@ struct smb_vol {
 	unsigned setuids:1;
 	unsigned noperm:1;
 	unsigned no_psx_acl:1; /* set if posix acl support should be disabled */
+	unsigned cifs_acl:1;
 	unsigned no_xattr:1;   /* set if xattr (EA) support should be disabled*/
 	unsigned server_ino:1; /* use inode numbers from server ie UniqueId */
 	unsigned direct_io:1;
@@ -1159,6 +1160,10 @@ cifs_parse_mount_options(char *options, const char *devname,struct smb_vol *vol)
 			vol->server_ino = 1;
 		} else if (strnicmp(data, "noserverino",9) == 0) {
 			vol->server_ino = 0;
+		} else if (strnicmp(data, "cifsacl",7) == 0) {
+			vol->cifs_acl = 1;
+		} else if (strnicmp(data, "nocifsacl", 9) == 0) {
+			vol->cifs_acl = 0;
 		} else if (strnicmp(data, "acl",3) == 0) {
 			vol->no_psx_acl = 0;
 		} else if (strnicmp(data, "noacl",5) == 0) {
@@ -1806,6 +1811,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
 		if(volume_info.nobrl)
 			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
+		if(volume_info.cifs_acl)
+			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
 
 		if(volume_info.direct_io) {
 			cFYI(1,("mounting share using direct i/o"));

fs/cifs/transport.c

@@ -489,7 +489,6 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 			receive_len, xid));
 		rc = -EIO;
 	} else {		/* rcvd frame is ok */
-
 		if (midQ->resp_buf && 
 			(midQ->midState == MID_RESPONSE_RECEIVED)) {
 

fs/cifs/xattr.c

@@ -254,7 +254,8 @@ ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
 		rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
 			buf_size, cifs_sb->local_nls,
 			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
-	} else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
+	} else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
+			  strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
 #ifdef CONFIG_CIFS_POSIX
 		if(sb->s_flags & MS_POSIXACL)
 			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
@@ -262,10 +263,27 @@ ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
 				cifs_sb->local_nls,
 				cifs_sb->mnt_cifs_flags & 
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
+/*		else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
+			__u16 fid;
+			int oplock = FALSE;
+			rc = CIFSSMBOpen(xid, pTcon, full_path,
+					 FILE_OPEN, GENERIC_READ, 0, &fid,
+					 &oplock, NULL, cifs_sb->local_nls,
+					 cifs_sb->mnt_cifs_flags &
+					 CIFS_MOUNT_MAP_SPECIAL_CHR);
+			if(rc == 0) {
+				rc = CIFSSMBGetCIFSACL(xid, pTcon, fid,
+					ea_value, buf_size,
+					ACL_TYPE_ACCESS);
+				CIFSSMBClose(xid, pTcon, fid)
+			}
+		} */  /* BB enable after fixing up return data */
+                  		
 #else 
 		cFYI(1,("query POSIX ACL not supported yet"));
 #endif /* CONFIG_CIFS_POSIX */
-	} else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
+	} else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,
+			  strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
 #ifdef CONFIG_CIFS_POSIX
 		if(sb->s_flags & MS_POSIXACL)
 			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,