POSIX protocol extensions part 1

fs/cifs/cifspdu.h

@@ -1687,6 +1687,83 @@ struct data_blob {
 	void (*free) (struct data_blob * data_blob);
 };
 
+#ifdef CIFS_POSIX
+/* 
+	For better POSIX semantics from Linux client, (even better
+	than the existing CIFS Unix Extensions) we need updated PDUs for:
+	
+	1) PosixCreateX - to set and return the mode, inode#, device info and
+	perhaps add a CreateDevice - to create Pipes and other special .inodes
+	Also note POSIX open flags
+	2) Close - to return the last write time to do cache across close more safely
+	3) PosixQFSInfo - to return statfs info
+	4) FindFirst return unique inode number - what about resume key, two forms short (matches readdir) and full (enough info to cache inodes)
+	5) Mkdir - set mode
+	
+	And under consideration: 
+	6) FindClose2 (return nanosecond timestamp ??)
+	7) Use nanosecond timestamps throughout all time fields if 
+	   corresponding attribute flag is set
+	8) sendfile - handle based copy
+	9) Direct i/o
+	10) "POSIX ACL" support
+	11) Misc fcntls?
+	
+	what about fixing 64 bit alignment
+	
+	There are also various legacy SMB/CIFS requests used as is
+	
+	From existing Lanman and NTLM dialects:
+	--------------------------------------
+	NEGOTIATE
+	SESSION_SETUP_ANDX (BB which?)
+	TREE_CONNECT_ANDX (BB which wct?)
+	TREE_DISCONNECT (BB add volume timestamp on response)
+	LOGOFF_ANDX
+	DELETE (note delete open file behavior)
+	DELETE_DIRECTORY
+	READ_AND_X
+	WRITE_AND_X
+	LOCKING_AND_X (note posix lock semantics)
+	RENAME (note rename across dirs and open file rename posix behaviors)
+	NT_RENAME (for hardlinks) Is this good enough for all features?
+	FIND_CLOSE2
+	TRANSACTION2 (18 cases)
+		SMB_SET_FILE_END_OF_FILE_INFO2 SMB_SET_PATH_END_OF_FILE_INFO2
+		(BB verify that never need to set allocation size)
+		SMB_SET_FILE_BASIC_INFO2 (setting times - BB can it be done via Unix ext?)
+	
+	COPY (note support for copy across directories) - FUTURE, OPTIONAL
+	setting/getting OS/2 EAs - FUTURE (BB can this handle
+	        setting Linux xattrs perfectly)         - OPTIONAL
+    dnotify                                         - FUTURE, OPTIONAL
+    quota                                           - FUTURE, OPTIONAL
+			
+	Note that various requests implemented for NT interop such as 
+		NT_TRANSACT (IOCTL) QueryReparseInfo
+	are unneeded to servers compliant with the CIFS POSIX extensions
+	
+	From CIFS Unix Extensions:
+	-------------------------
+	T2 SET_PATH_INFO (SMB_SET_FILE_UNIX_LINK) for symlinks
+	T2 SET_PATH_INFO (SMB_SET_FILE_BASIC_INFO2)
+	T2 QUERY_PATH_INFO (SMB_QUERY_FILE_UNIX_LINK)
+	T2 QUERY_PATH_INFO (SMB_QUERY_FILE_UNIX_BASIC) - BB check for missing inode fields
+					Actually need QUERY_FILE_UNIX_INFO since has inode num
+					BB what about a) blksize/blkbits/blocks
+								  b) i_version
+								  c) i_rdev
+								  d) notify mask?
+								  e) generation
+								  f) size_seqcount
+	T2 FIND_FIRST/FIND_NEXT FIND_FILE_UNIX
+	TRANS2_GET_DFS_REFERRAL				  - OPTIONAL but recommended
+	T2_QFS_INFO QueryDevice/AttributeInfo - OPTIONAL
+	
+	
+ */
+#endif 
+
 #pragma pack()			/* resume default structure packing */
 
 #endif				/* _CIFSPDU_H */

fs/cifs/cifssmb.c

@@ -37,13 +37,24 @@
 #include "cifs_unicode.h"
 #include "cifs_debug.h"
 
+#ifdef CIFS_POSIX
 static struct {
 	int index;
 	char *name;
 } protocols[] = {
 	{CIFS_PROT, "\2NT LM 0.12"}, 
+	{CIFS_PROT, "\2POSIX 2"},
 	{BAD_PROT, "\2"}
 };
+#else
+static struct {
+	int index;
+	char *name;
+} protocols[] = {
+	{CIFS_PROT, "\2NT LM 0.12"}, 
+	{BAD_PROT, "\2"}
+};
+#endif
 
 
 /* Mark as invalid, all open files on tree connections since they
@@ -987,60 +998,59 @@ int CIFSSMBRenameOpenFile(const int xid,struct cifsTconInfo *pTcon,
 
 int
 CIFSSMBCopy(const int xid, struct cifsTconInfo *tcon, const char * fromName, 
-              const __u16 target_tid, const char *toName, const int flags,
-              const struct nls_table *nls_codepage)
+            const __u16 target_tid, const char *toName, const int flags,
+            const struct nls_table *nls_codepage)
 {
-        int rc = 0;
-        COPY_REQ *pSMB = NULL;
-        COPY_RSP *pSMBr = NULL;
-        int bytes_returned;
-        int name_len, name_len2;
+	int rc = 0;
+	COPY_REQ *pSMB = NULL;
+	COPY_RSP *pSMBr = NULL;
+	int bytes_returned;
+	int name_len, name_len2;
 
-        cFYI(1, ("In CIFSSMBCopy"));
+	cFYI(1, ("In CIFSSMBCopy"));
 copyRetry:
-        rc = smb_init(SMB_COM_COPY, 1, tcon, (void **) &pSMB,
-                      (void **) &pSMBr);
-        if (rc)
-                return rc;
+	rc = smb_init(SMB_COM_COPY, 1, tcon, (void **) &pSMB,
+			(void **) &pSMBr);
+	if (rc)
+		return rc;
 
-        pSMB->BufferFormat = 0x04;
+	pSMB->BufferFormat = 0x04;
 	pSMB->Tid2 = target_tid;
 
 	if(flags & COPY_TREE)
 		pSMB->Flags |= COPY_TREE;
 	pSMB->Flags = cpu_to_le16(pSMB->Flags);
 
-        if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
-                name_len =
-                    cifs_strtoUCS((wchar_t *) pSMB->OldFileName, fromName, 530
-                                  /* find define for this maxpathcomponent */
-                                  , nls_codepage);
-                name_len++;     /* trailing null */
-                name_len *= 2;
-                pSMB->OldFileName[name_len] = 0x04;     /* pad */
-        /* protocol requires ASCII signature byte on Unicode string */
-                pSMB->OldFileName[name_len + 1] = 0x00;
-                name_len2 =
-                    cifs_strtoUCS((wchar_t *) & pSMB->
-                                  OldFileName[name_len + 2], toName, 530,
-                                  nls_codepage);
-                name_len2 += 1 /* trailing null */  + 1 /* Signature word */ ;
-                name_len2 *= 2; /* convert to bytes */
-        } else {                /* BB improve the check for buffer overruns BB */
-                name_len = strnlen(fromName, 530);
-                name_len++;     /* trailing null */
-                strncpy(pSMB->OldFileName, fromName, name_len);
-                name_len2 = strnlen(toName, 530);
-                name_len2++;    /* trailing null */
-                pSMB->OldFileName[name_len] = 0x04;  /* 2nd buffer format */
-                strncpy(&pSMB->OldFileName[name_len + 1], toName, name_len2);
-                name_len2++;    /* trailing null */
-                name_len2++;    /* signature byte */
-        }
-
-        pSMB->ByteCount = 1 /* 1st signature byte */  + name_len + name_len2;
-        pSMB->hdr.smb_buf_length += pSMB->ByteCount;
-        pSMB->ByteCount = cpu_to_le16(pSMB->ByteCount);
+	if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
+		name_len = cifs_strtoUCS((wchar_t *) pSMB->OldFileName, 
+				fromName, 
+				530 /* find define for this maxpathcomponent */,
+				nls_codepage);
+		name_len++;     /* trailing null */
+		name_len *= 2;
+		pSMB->OldFileName[name_len] = 0x04;     /* pad */
+		/* protocol requires ASCII signature byte on Unicode string */
+		pSMB->OldFileName[name_len + 1] = 0x00;
+		name_len2 = cifs_strtoUCS((wchar_t *) & pSMB->
+				OldFileName[name_len + 2], toName, 530,
+				nls_codepage);
+		name_len2 += 1 /* trailing null */  + 1 /* Signature word */ ;
+		name_len2 *= 2; /* convert to bytes */
+	} else {                /* BB improve the check for buffer overruns BB */
+		name_len = strnlen(fromName, 530);
+		name_len++;     /* trailing null */
+		strncpy(pSMB->OldFileName, fromName, name_len);
+		name_len2 = strnlen(toName, 530);
+		name_len2++;    /* trailing null */
+		pSMB->OldFileName[name_len] = 0x04;  /* 2nd buffer format */
+		strncpy(&pSMB->OldFileName[name_len + 1], toName, name_len2);
+		name_len2++;    /* trailing null */
+		name_len2++;    /* signature byte */
+	}
+
+	pSMB->ByteCount = 1 /* 1st signature byte */  + name_len + name_len2;
+	pSMB->hdr.smb_buf_length += pSMB->ByteCount;
+	pSMB->ByteCount = cpu_to_le16(pSMB->ByteCount);
 
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
 		(struct smb_hdr *) pSMBr, &bytes_returned, 0);