Fix bug #7410 - samba sends "raw" inode number as uniqueid with unix extensions.

Move to a consistent get_FileIndex() function for all inode returns,
that checks if st_dev on the file is identical to the top directory
dev_t of the exported share, and if so uses the raw 64-bit inode
number. If it isn't (we've traversed a mount point) - return what
we used to do for Windows which is the concatination of the bottom
32-bits of the inode with the 32-bit device number. We can get more
creative with this over time (hashing?) if we want as now all inode returns go
through this single function.

Jeremy.

3 files changed, 35 insertions, 10 deletions

diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index 36184af75c..8ba32652cd 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -1033,6 +1033,7 @@ connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
 		*pstatus = NT_STATUS_BAD_NETWORK_NAME;
 		goto err_root_exit;
 	}
+	conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
 
 	string_set(&conn->origpath,conn->connectpath);
 
diff --git a/source3/smbd/smb2_create.c b/source3/smbd/smb2_create.c
index 09bd827802..cc65df235c 100644
--- a/source3/smbd/smb2_create.c
+++ b/source3/smbd/smb2_create.c
@@ -741,13 +741,18 @@ static struct tevent_req *smbd_smb2_create_send(TALLOC_CTX *mem_ctx,
 
 		if (qfid) {
 			uint8_t p[32];
+			uint64_t file_index = get_FileIndex(result->conn,
+							&result->fsp_name->st);
 			DATA_BLOB blob = data_blob_const(p, sizeof(p));
 
 			ZERO_STRUCT(p);
 
-			/* TODO: maybe use result->file_id */
-			SIVAL(p, 0, result->fsp_name->st.st_ex_ino);/* FileIndexLow */
-			SIVAL(p, 4, result->fsp_name->st.st_ex_dev);/* FileIndexHigh */
+			/* From conversations with Microsoft engineers at
+			   the MS plugfest. The first 8 bytes are the "volume index"
+			   == inode, the second 8 bytes are the "volume id",
+			   == dev. This will be updated in the SMB2 doc. */
+			SBVAL(p, 0, file_index);
+			SIVAL(p, 8, result->fsp_name->st.st_ex_dev);/* FileIndexHigh */
 
 			status = smb2_create_blob_add(state, &out_context_blobs,
 						      SMB2_CREATE_TAG_QFID,
diff --git a/source3/smbd/trans2.c b/source3/smbd/trans2.c
index 6e1defaac2..8535d46afa 100644
--- a/source3/smbd/trans2.c
+++ b/source3/smbd/trans2.c
@@ -58,6 +58,23 @@ uint64_t smb_roundup(connection_struct *conn, uint64_t val)
 	return val;
 }
 
+/********************************************************************
+ Create a 64 bit FileIndex. If the file is on the same device as
+ the root of the share, just return the 64-bit inode. If it isn't,
+ mangle as we used to do.
+********************************************************************/
+
+uint64_t get_FileIndex(connection_struct *conn, const SMB_STRUCT_STAT *psbuf)
+{
+	uint64_t file_index;
+	if (conn->base_share_dev == psbuf->st_ex_dev) {
+		return (uint64_t)psbuf->st_ex_ino;
+	}
+	file_index = ((psbuf->st_ex_ino) & UINT32_MAX); /* FileIndexLow */
+	file_index |= ((uint64_t)((psbuf->st_ex_dev) & UINT32_MAX)) << 32; /* FileIndexHigh */
+	return file_index;
+}
+
 /****************************************************************************
  Utility functions for dealing with extended attributes.
 ****************************************************************************/
@@ -1478,6 +1495,7 @@ static bool smbd_marshall_dir_entry(TALLOC_CTX *ctx,
 	uint32_t reskey=0;
 	uint64_t file_size = 0;
 	uint64_t allocation_size = 0;
+	uint64_t file_index = 0;
 	uint32_t len;
 	struct timespec mdate_ts, adate_ts, cdate_ts, create_date_ts;
 	time_t mdate = (time_t)0, adate = (time_t)0, create_date = (time_t)0;
@@ -1500,6 +1518,8 @@ static bool smbd_marshall_dir_entry(TALLOC_CTX *ctx,
 	}
 	allocation_size = SMB_VFS_GET_ALLOC_SIZE(conn, NULL, &smb_fname->st);
 
+	file_index = get_FileIndex(conn, &smb_fname->st);
+
 	mdate_ts = smb_fname->st.st_ex_mtime;
 	adate_ts = smb_fname->st.st_ex_atime;
 	create_date_ts = get_create_timespec(conn, NULL, smb_fname);
@@ -1886,8 +1906,7 @@ static bool smbd_marshall_dir_entry(TALLOC_CTX *ctx,
 			p +=4;
 		}
 		SIVAL(p,0,0); p += 4; /* Unknown - reserved ? */
-		SIVAL(p,0,smb_fname->st.st_ex_ino); p += 4; /* FileIndexLow */
-		SIVAL(p,0,smb_fname->st.st_ex_dev); p += 4; /* FileIndexHigh */
+		SBVAL(p,0,file_index); p += 8;
 		len = srvstr_push(base_data, flags2, p,
 				  fname, PTR_DIFF(end_data, p),
 				  STR_TERMINATE_ASCII);
@@ -1957,8 +1976,7 @@ static bool smbd_marshall_dir_entry(TALLOC_CTX *ctx,
 		}
 		p += 26;
 		SSVAL(p,0,0); p += 2; /* Reserved ? */
-		SIVAL(p,0,smb_fname->st.st_ex_ino); p += 4; /* FileIndexLow */
-		SIVAL(p,0,smb_fname->st.st_ex_dev); p += 4; /* FileIndexHigh */
+		SBVAL(p,0,file_index); p += 8;
 		len = srvstr_push(base_data, flags2, p,
 				  fname, PTR_DIFF(end_data, p),
 				  STR_TERMINATE_ASCII);
@@ -3890,6 +3908,8 @@ static char *store_file_unix_basic(connection_struct *conn,
 				files_struct *fsp,
 				const SMB_STRUCT_STAT *psbuf)
 {
+	uint64_t file_index = get_FileIndex(conn, psbuf);
+
 	DEBUG(10,("store_file_unix_basic: SMB_QUERY_FILE_UNIX_BASIC\n"));
 	DEBUG(4,("store_file_unix_basic: st_mode=%o\n",(int)psbuf->st_ex_mode));
 
@@ -3923,7 +3943,7 @@ static char *store_file_unix_basic(connection_struct *conn,
 	SIVAL(pdata,4,0);
 	pdata += 8;
 
-	SINO_T_VAL(pdata,0,(SMB_INO_T)psbuf->st_ex_ino);   /* inode number */
+	SINO_T_VAL(pdata,0,(SMB_INO_T)file_index);   /* inode number */
 	pdata += 8;
 
 	SIVAL(pdata,0, unix_perms_to_wire(psbuf->st_ex_mode));     /* Standard UNIX file permissions */
@@ -4319,8 +4339,7 @@ NTSTATUS smbd_do_qfilepathinfo(connection_struct *conn,
 
 	   I think this causes us to fail the IFSKIT
 	   BasicFileInformationTest. -tpot */
-	file_index =  ((psbuf->st_ex_ino) & UINT32_MAX); /* FileIndexLow */
-	file_index |= ((uint64_t)((psbuf->st_ex_dev) & UINT32_MAX)) << 32; /* FileIndexHigh */
+	file_index = get_FileIndex(conn, psbuf);
 
 	switch (info_level) {
 		case SMB_INFO_STANDARD: