s3: Replace some create_synthetic_smb_fname() calls

In very hot codepaths like the statcache copy_smb_filename and the subsequent
recursive talloc_free is noticable in the CPU load.

7 files changed, 63 insertions, 115 deletions

diff --git a/source3/modules/vfs_default.c b/source3/modules/vfs_default.c
index 848440809c..258caf8299 100644
--- a/source3/modules/vfs_default.c
+++ b/source3/modules/vfs_default.c
@@ -1226,21 +1226,17 @@ static NTSTATUS vfswrap_streaminfo(vfs_handle_struct *handle,
 		ret = SMB_VFS_FSTAT(fsp, &sbuf);
 	}
 	else {
-		struct smb_filename *smb_fname = NULL;
-		NTSTATUS status;
+		struct smb_filename smb_fname;
+
+		ZERO_STRUCT(smb_fname);
+		smb_fname.base_name = discard_const_p(char, fname);
 
-		status = create_synthetic_smb_fname(talloc_tos(), fname, NULL,
-						    NULL, &smb_fname);
-		if (!NT_STATUS_IS_OK(status)) {
-			return status;
-		}
 		if (lp_posix_pathnames()) {
-			ret = SMB_VFS_LSTAT(handle->conn, smb_fname);
+			ret = SMB_VFS_LSTAT(handle->conn, &smb_fname);
 		} else {
-			ret = SMB_VFS_STAT(handle->conn, smb_fname);
+			ret = SMB_VFS_STAT(handle->conn, &smb_fname);
 		}
-		sbuf = smb_fname->st;
-		TALLOC_FREE(smb_fname);
+		sbuf = smb_fname.st;
 	}
 
 	if (ret == -1) {
diff --git a/source3/smbd/dir.c b/source3/smbd/dir.c
index 5d18d452f8..5ce4a7b099 100644
--- a/source3/smbd/dir.c
+++ b/source3/smbd/dir.c
@@ -613,14 +613,13 @@ char *dptr_ReadDirName(TALLOC_CTX *ctx,
 			long *poffset,
 			SMB_STRUCT_STAT *pst)
 {
-	struct smb_filename *smb_fname_base = NULL;
+	struct smb_filename smb_fname_base;
 	char *name = NULL;
 	const char *name_temp = NULL;
 	char *talloced = NULL;
 	char *pathreal = NULL;
 	char *found_name = NULL;
 	int ret;
-	NTSTATUS status;
 
 	SET_STAT_INVALID(*pst);
 
@@ -673,19 +672,14 @@ char *dptr_ReadDirName(TALLOC_CTX *ctx,
 		return NULL;
 
 	/* Create an smb_filename with stream_name == NULL. */
-	status = create_synthetic_smb_fname(ctx, pathreal, NULL, NULL,
-					    &smb_fname_base);
-	if (!NT_STATUS_IS_OK(status)) {
-		return NULL;
-	}
+	ZERO_STRUCT(smb_fname_base);
+	smb_fname_base.base_name = pathreal;
 
-	if (SMB_VFS_STAT(dptr->conn, smb_fname_base) == 0) {
-		*pst = smb_fname_base->st;
-		TALLOC_FREE(smb_fname_base);
+	if (SMB_VFS_STAT(dptr->conn, &smb_fname_base) == 0) {
+		*pst = smb_fname_base.st;
 		name = talloc_strdup(ctx, dptr->wcard);
 		goto clean;
 	} else {
-		TALLOC_FREE(smb_fname_base);
 		/* If we get any other error than ENOENT or ENOTDIR
 		   then the file exists we just can't stat it. */
 		if (errno != ENOENT && errno != ENOTDIR) {
@@ -916,7 +910,7 @@ bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
 		bool isdots;
 		char *fname = NULL;
 		char *pathreal = NULL;
-		struct smb_filename *smb_fname = NULL;
+		struct smb_filename smb_fname;
 		uint32_t mode = 0;
 		bool ok;
 		NTSTATUS status;
@@ -961,21 +955,15 @@ bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
 		}
 
 		/* Create smb_fname with NULL stream_name. */
-		status = create_synthetic_smb_fname(ctx, pathreal,
-						    NULL, &sbuf,
-						    &smb_fname);
-		TALLOC_FREE(pathreal);
-		if (!NT_STATUS_IS_OK(status)) {
-			TALLOC_FREE(dname);
-			TALLOC_FREE(fname);
-			return false;
-		}
+		ZERO_STRUCT(smb_fname);
+		smb_fname.base_name = pathreal;
+		smb_fname.st = sbuf;
 
-		ok = mode_fn(ctx, private_data, smb_fname, &mode);
+		ok = mode_fn(ctx, private_data, &smb_fname, &mode);
 		if (!ok) {
 			TALLOC_FREE(dname);
 			TALLOC_FREE(fname);
-			TALLOC_FREE(smb_fname);
+			TALLOC_FREE(pathreal);
 			continue;
 		}
 
@@ -984,7 +972,7 @@ bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
 				fname, (unsigned int)mode, (unsigned int)dirtype));
 			TALLOC_FREE(dname);
 			TALLOC_FREE(fname);
-			TALLOC_FREE(smb_fname);
+			TALLOC_FREE(pathreal);
 			continue;
 		}
 
@@ -993,25 +981,29 @@ bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
 			struct file_id fileid;
 
 			fileid = vfs_file_id_from_sbuf(conn,
-						       &smb_fname->st);
+						       &smb_fname.st);
 			get_file_infos(fileid, NULL, &write_time_ts);
 			if (!null_timespec(write_time_ts)) {
-				update_stat_ex_mtime(&smb_fname->st,
+				update_stat_ex_mtime(&smb_fname.st,
 						     write_time_ts);
 			}
 		}
 
 		DEBUG(3,("smbd_dirptr_get_entry mask=[%s] found %s "
 			"fname=%s (%s)\n",
-			mask, smb_fname_str_dbg(smb_fname),
+			mask, smb_fname_str_dbg(&smb_fname),
 			dname, fname));
 
 		DirCacheAdd(dirptr->dir_hnd, dname, cur_offset);
 
 		TALLOC_FREE(dname);
 
+		status = copy_smb_filename(ctx, &smb_fname, _smb_fname);
+		TALLOC_FREE(pathreal);
+		if (!NT_STATUS_IS_OK(status)) {
+			return false;
+		}
 		*_fname = fname;
-		*_smb_fname = smb_fname;
 		*_mode = mode;
 		*_prev_offset = prev_offset;
 
diff --git a/source3/smbd/msdfs.c b/source3/smbd/msdfs.c
index fce8417045..dcef75e094 100644
--- a/source3/smbd/msdfs.c
+++ b/source3/smbd/msdfs.c
@@ -419,8 +419,7 @@ static bool is_msdfs_link_internal(TALLOC_CTX *ctx,
 #endif
 	size_t bufsize = 0;
 	char *link_target = NULL;
-	struct smb_filename *smb_fname = NULL;
-	NTSTATUS status;
+	struct smb_filename smb_fname;
 
 	if (pp_link_target) {
 		bufsize = 1024;
@@ -434,28 +433,22 @@ static bool is_msdfs_link_internal(TALLOC_CTX *ctx,
 		link_target = link_target_buf;
 	}
 
-	status = create_synthetic_smb_fname(talloc_tos(), path, NULL, NULL,
-					    &smb_fname);
-	if (!NT_STATUS_IS_OK(status)) {
-		goto err;
-	}
+	ZERO_STRUCT(smb_fname);
+	smb_fname.base_name = discard_const_p(char, path);
 
-	if (SMB_VFS_LSTAT(conn, smb_fname) != 0) {
+	if (SMB_VFS_LSTAT(conn, &smb_fname) != 0) {
 		DEBUG(5,("is_msdfs_link_read_target: %s does not exist.\n",
 			path));
-		TALLOC_FREE(smb_fname);
 		goto err;
 	}
-	if (!S_ISLNK(smb_fname->st.st_ex_mode)) {
+	if (!S_ISLNK(smb_fname.st.st_ex_mode)) {
 		DEBUG(5,("is_msdfs_link_read_target: %s is not a link.\n",
 					path));
-		TALLOC_FREE(smb_fname);
 		goto err;
 	}
 	if (sbufp != NULL) {
-		*sbufp = smb_fname->st;
+		*sbufp = smb_fname.st;
 	}
-	TALLOC_FREE(smb_fname);
 
 	referral_len = SMB_VFS_READLINK(conn, path, link_target, bufsize - 1);
 	if (referral_len == -1) {
diff --git a/source3/smbd/notify.c b/source3/smbd/notify.c
index e430fcfc04..0c75769594 100644
--- a/source3/smbd/notify.c
+++ b/source3/smbd/notify.c
@@ -367,20 +367,16 @@ void notify_fname(connection_struct *conn, uint32 action, uint32 filter,
 		path += 2;
 	}
 	if (parent_dirname(talloc_tos(), path, &parent, &name)) {
-		struct smb_filename *smb_fname_parent = NULL;
-		NTSTATUS status;
+		struct smb_filename smb_fname_parent;
 
-		status = create_synthetic_smb_fname(talloc_tos(), parent, NULL,
-						    NULL, &smb_fname_parent);
-		if (!NT_STATUS_IS_OK(status)) {
-			return;
-		}
-		if (SMB_VFS_STAT(conn, smb_fname_parent) != -1) {
+		ZERO_STRUCT(smb_fname_parent);
+		smb_fname_parent.base_name = parent;
+
+		if (SMB_VFS_STAT(conn, &smb_fname_parent) != -1) {
 			notify_onelevel(conn->notify_ctx, action, filter,
-			    SMB_VFS_FILE_ID_CREATE(conn, &smb_fname_parent->st),
+			    SMB_VFS_FILE_ID_CREATE(conn, &smb_fname_parent.st),
 			    name);
 		}
-		TALLOC_FREE(smb_fname_parent);
 	}
 
 	fullpath = talloc_asprintf(talloc_tos(), "%s/%s", conn->connectpath,
diff --git a/source3/smbd/posix_acls.c b/source3/smbd/posix_acls.c
index 15ea4d5fb2..65d0929024 100644
--- a/source3/smbd/posix_acls.c
+++ b/source3/smbd/posix_acls.c
@@ -3460,49 +3460,41 @@ NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
 	SMB_ACL_T posix_acl = NULL;
 	SMB_ACL_T def_acl = NULL;
 	struct pai_val *pal;
-	struct smb_filename *smb_fname = NULL;
-	NTSTATUS status;
+	struct smb_filename smb_fname;
 	int ret;
 
 	*ppdesc = NULL;
 
 	DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
 
-	status = create_synthetic_smb_fname(talloc_tos(), name, NULL, NULL,
-					    &smb_fname);
-	if (!NT_STATUS_IS_OK(status)) {
-		return status;
-	}
+	ZERO_STRUCT(smb_fname);
+	smb_fname.base_name = discard_const_p(char, name);
 
 	/* Get the stat struct for the owner info. */
 	if (lp_posix_pathnames()) {
-		ret = SMB_VFS_LSTAT(conn, smb_fname);
+		ret = SMB_VFS_LSTAT(conn, &smb_fname);
 	} else {
-		ret = SMB_VFS_STAT(conn, smb_fname);
+		ret = SMB_VFS_STAT(conn, &smb_fname);
 	}
 
 	if (ret == -1) {
-		status = map_nt_error_from_unix(errno);
-		goto out;
+		return map_nt_error_from_unix(errno);
 	}
 
 	/* Get the ACL from the path. */
 	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
 
 	/* If it's a directory get the default POSIX ACL. */
-	if(S_ISDIR(smb_fname->st.st_ex_mode)) {
+	if(S_ISDIR(smb_fname.st.st_ex_mode)) {
 		def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
 		def_acl = free_empty_sys_acl(conn, def_acl);
 	}
 
 	pal = load_inherited_info(conn, name);
 
-	status = posix_get_nt_acl_common(conn, name, &smb_fname->st, pal,
-					 posix_acl, def_acl, security_info,
-					 ppdesc);
- out:
-	TALLOC_FREE(smb_fname);
-	return status;
+	return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
+				       posix_acl, def_acl, security_info,
+				       ppdesc);
 }
 
 /****************************************************************************
diff --git a/source3/smbd/statcache.c b/source3/smbd/statcache.c
index da52cc05d4..db347b5b7e 100644
--- a/source3/smbd/statcache.c
+++ b/source3/smbd/statcache.c
@@ -175,8 +175,7 @@ bool stat_cache_lookup(connection_struct *conn,
 	DATA_BLOB data_val;
 	char *name;
 	TALLOC_CTX *ctx = talloc_tos();
-	struct smb_filename *smb_fname = NULL;
-	NTSTATUS status;
+	struct smb_filename smb_fname;
 
 	*pp_dirpath = NULL;
 	*pp_start = *pp_name;
@@ -276,25 +275,18 @@ bool stat_cache_lookup(connection_struct *conn,
 		  "-> [%s]\n", chk_name, translated_path ));
 	DO_PROFILE_INC(statcache_hits);
 
-	status = create_synthetic_smb_fname(talloc_tos(), translated_path,
-					    NULL, NULL, &smb_fname);
-	if (!NT_STATUS_IS_OK(status)) {
-		TALLOC_FREE(chk_name);
-		TALLOC_FREE(translated_path);
-		return false;
-	}
+	ZERO_STRUCT(smb_fname);
+	smb_fname.base_name = translated_path;
 
-	if (SMB_VFS_STAT(conn, smb_fname) != 0) {
+	if (SMB_VFS_STAT(conn, &smb_fname) != 0) {
 		/* Discard this entry - it doesn't exist in the filesystem. */
 		memcache_delete(smbd_memcache(), STAT_CACHE,
 				data_blob_const(chk_name, strlen(chk_name)));
 		TALLOC_FREE(chk_name);
 		TALLOC_FREE(translated_path);
-		TALLOC_FREE(smb_fname);
 		return False;
 	}
-	*pst = smb_fname->st;
-	TALLOC_FREE(smb_fname);
+	*pst = smb_fname.st;
 
 	if (!sizechanged) {
 		memcpy(*pp_name, translated_path,
diff --git a/source3/smbd/trans2.c b/source3/smbd/trans2.c
index dacf5f34e0..17ebd81313 100644
--- a/source3/smbd/trans2.c
+++ b/source3/smbd/trans2.c
@@ -2879,9 +2879,8 @@ NTSTATUS smbd_do_qfsinfo(connection_struct *conn,
 	int snum = SNUM(conn);
 	char *fstype = lp_fstype(SNUM(conn));
 	uint32 additional_flags = 0;
-	struct smb_filename *smb_fname_dot = NULL;
+	struct smb_filename smb_fname_dot;
 	SMB_STRUCT_STAT st;
-	NTSTATUS status;
 
 	if (IS_IPC(conn)) {
 		if (info_level != SMB_QUERY_CIFS_UNIX_INFO) {
@@ -2894,20 +2893,15 @@ NTSTATUS smbd_do_qfsinfo(connection_struct *conn,
 
 	DEBUG(3,("smbd_do_qfsinfo: level = %d\n", info_level));
 
-	status = create_synthetic_smb_fname(talloc_tos(), ".", NULL, NULL,
-					    &smb_fname_dot);
-	if (!NT_STATUS_IS_OK(status)) {
-		return status;
-	}
+	ZERO_STRUCT(smb_fname_dot);
+	smb_fname_dot.base_name = discard_const_p(char, ".");
 
-	if(SMB_VFS_STAT(conn, smb_fname_dot) != 0) {
+	if(SMB_VFS_STAT(conn, &smb_fname_dot) != 0) {
 		DEBUG(2,("stat of . failed (%s)\n", strerror(errno)));
-		TALLOC_FREE(smb_fname_dot);
 		return map_nt_error_from_unix(errno);
 	}
 
-	st = smb_fname_dot->st;
-	TALLOC_FREE(smb_fname_dot);
+	st = smb_fname_dot.st;
 
 	*ppdata = (char *)SMB_REALLOC(
 		*ppdata, max_data_bytes + DIR_ENTRY_SAFETY_MARGIN);
@@ -5392,12 +5386,11 @@ NTSTATUS smb_set_file_time(connection_struct *conn,
 			   struct smb_file_time *ft,
 			   bool setting_write_time)
 {
-	struct smb_filename *smb_fname_base = NULL;
+	struct smb_filename smb_fname_base;
 	uint32 action =
 		FILE_NOTIFY_CHANGE_LAST_ACCESS
 		|FILE_NOTIFY_CHANGE_LAST_WRITE
 		|FILE_NOTIFY_CHANGE_CREATION;
-	NTSTATUS status;
 
 	if (!VALID_STAT(smb_fname->st)) {
 		return NT_STATUS_OBJECT_NAME_NOT_FOUND;
@@ -5469,18 +5462,12 @@ NTSTATUS smb_set_file_time(connection_struct *conn,
 	DEBUG(10,("smb_set_file_time: setting utimes to modified values.\n"));
 
 	/* Always call ntimes on the base, even if a stream was passed in. */
-	status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
-					    NULL, &smb_fname->st,
-					    &smb_fname_base);
-	if (!NT_STATUS_IS_OK(status)) {
-		return status;
-	}
+	smb_fname_base = *smb_fname;
+	smb_fname_base.stream_name = NULL;
 
-	if(file_ntimes(conn, smb_fname_base, ft)!=0) {
-		TALLOC_FREE(smb_fname_base);
+	if(file_ntimes(conn, &smb_fname_base, ft)!=0) {
 		return map_nt_error_from_unix(errno);
 	}
-	TALLOC_FREE(smb_fname_base);
 
 	notify_fname(conn, NOTIFY_ACTION_MODIFIED, action,
 		     smb_fname->base_name);