btrfs-progs: dump-tree: rename to option to --hide-names

Previously, no filenames/xattrs would be printed with --nofilename, but
to keep the format of dump, print a placeholder instead of all names.
This is:

* directory entries (files, directories, subvolumes)
* default subvolume
* extended attributes (name, value)
* hardlink names if stored inside another item

Note that lengths are not hidden because they can be calculated from the
item size anyway.

Signed-off-by: David Sterba <dsterba@suse.com>

Documentation/btrfs-inspect-internal.asciidoc

@@ -100,9 +100,20 @@ intermixed in the output
 +
 use breadth-first search to print trees, the nodes are printed before all
 leaves
---nofilename::::
-do not print any filename of the filesystem. Useful for developer to inspect
-the filesystem while keep confidential info hiden.
++
+--hide-names::::
+print a placeholder 'HIDDEN' instead of various names, useful for developers to
+inspect the dump while keeping potentially sensitive information hidden
++
+This is:
+[options="compact"]
+* directory entries (files, directories, subvolumes)
+* default subvolume
+* extended attributes (name, value)
+* hardlink names (if stored inside another item or as extended references in standalone items)
++
+NOTE: lengths are not hidden because they can be calculated from the item size anyway.
++
 --noscan::::
 do not automatically scan the system for other devices from the same
 filesystem, only use the devices provided as the arguments

cmds/inspect-dump-tree.c

@@ -206,6 +206,7 @@ static const char * const cmd_inspect_dump_tree_usage[] = {
 	"--noscan               do not scan the devices from the filesystem, use only the listed ones",
 	"--bfs                  breadth-first traversal of the trees, print nodes, then leaves (default)",
 	"--dfs                  depth-first traversal of the trees",
+	"--hide-names           hide filenames/subvolume/xattrs and other name references",
 	NULL
 };
 
@@ -330,7 +331,7 @@ static int cmd_inspect_dump_tree(const struct cmd_struct *cmd,
 	while (1) {
 		int c;
 		enum { GETOPT_VAL_FOLLOW = 256, GETOPT_VAL_DFS, GETOPT_VAL_BFS,
-		       GETOPT_VAL_NOSCAN, GETOPT_VAL_NOFILENAME };
+		       GETOPT_VAL_NOSCAN, GETOPT_VAL_HIDE_NAMES };
 		static const struct option long_options[] = {
 			{ "extents", no_argument, NULL, 'e'},
 			{ "device", no_argument, NULL, 'd'},
@@ -343,8 +344,7 @@ static int cmd_inspect_dump_tree(const struct cmd_struct *cmd,
 			{ "bfs", no_argument, NULL, GETOPT_VAL_BFS },
 			{ "dfs", no_argument, NULL, GETOPT_VAL_DFS },
 			{ "noscan", no_argument, NULL, GETOPT_VAL_NOSCAN },
-			{ "nofilename", no_argument, NULL,
-				GETOPT_VAL_NOFILENAME },
+			{ "hide-names", no_argument, NULL, GETOPT_VAL_HIDE_NAMES },
 			{ NULL, 0, NULL, 0 }
 		};
 
@@ -412,8 +412,8 @@ static int cmd_inspect_dump_tree(const struct cmd_struct *cmd,
 		case GETOPT_VAL_NOSCAN:
 			open_ctree_flags |= OPEN_CTREE_NO_DEVICES;
 			break;
-		case GETOPT_VAL_NOFILENAME:
-			open_ctree_flags |= OPEN_CTREE_DONT_PRINT_FILENAME;
+		case GETOPT_VAL_HIDE_NAMES:
+			open_ctree_flags |= OPEN_CTREE_HIDE_NAMES;
 			break;
 		default:
 			usage_unknown_option(cmd, argv);

ctree.h

@@ -1193,7 +1193,7 @@ struct btrfs_fs_info {
 	unsigned int avoid_meta_chunk_alloc:1;
 	unsigned int avoid_sys_chunk_alloc:1;
 	unsigned int finalize_on_close:1;
-	unsigned int dont_print_filename:1;
+	unsigned int hide_names:1;
 
 	int transaction_aborted;
 

disk-io.c

@@ -1218,8 +1218,8 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
 		fs_info->ignore_fsid_mismatch = 1;
 	if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
 		fs_info->ignore_chunk_tree_error = 1;
-	if (flags & OPEN_CTREE_DONT_PRINT_FILENAME)
-		fs_info->dont_print_filename = 1;
+	if (flags & OPEN_CTREE_HIDE_NAMES)
+		fs_info->hide_names = 1;
 
 	if ((flags & OPEN_CTREE_RECOVER_SUPER)
 	     && (flags & OPEN_CTREE_TEMPORARY_SUPER)) {

disk-io.h

@@ -86,8 +86,8 @@ enum btrfs_open_ctree_flags {
 	 */
 	OPEN_CTREE_INVALIDATE_FST = (1U << 13),
 
-	/* For print-tree only, skip filename output */
-	OPEN_CTREE_DONT_PRINT_FILENAME = (1U << 14),
+	/* For print-tree, print HIDDEN instead of filenames/xattrs/refs */
+	OPEN_CTREE_HIDE_NAMES = (1U << 14),
 };
 
 /*

print-tree.c

@@ -70,13 +70,20 @@ static void print_dir_item(struct extent_buffer *eb, u32 size,
 		printf("\t\ttransid %llu data_len %u name_len %u\n",
 				btrfs_dir_transid(eb, di),
 				data_len, name_len);
-		if (!(eb->fs_info && eb->fs_info->dont_print_filename)) {
+		if (eb->fs_info && eb->fs_info->hide_names) {
+			printf("\t\tname: HIDDEN\n");
+		} else {
 			read_extent_buffer(eb, namebuf,
 					(unsigned long)(di + 1), len);
 			printf("\t\tname: %.*s\n", len, namebuf);
-			if (data_len) {
-				len = (data_len <= sizeof(namebuf))? data_len:
-					sizeof(namebuf);
+		}
+
+		if (data_len) {
+			len = (data_len <= sizeof(namebuf)) ? data_len :
+			      sizeof(namebuf);
+			if (eb->fs_info && eb->fs_info->hide_names) {
+				printf("\t\tdata HIDDEN\n");
+			} else {
 				read_extent_buffer(eb, namebuf,
 					(unsigned long)(di + 1) + name_len, len);
 				printf("\t\tdata %.*s\n", len, namebuf);
@@ -105,15 +112,14 @@ static void print_inode_extref_item(struct extent_buffer *eb, u32 size,
 
 		len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);
 
-		if (eb->fs_info && eb->fs_info->dont_print_filename) {
-			printf("\t\tindex %llu [arent %llu namelen %u\n",
+		printf("\t\tindex %llu parent %llu namelen %u ",
 				index, parent_objid, name_len);
+		if (eb->fs_info && eb->fs_info->hide_names) {
+			printf("name: HIDDEN\n");
 		} else {
 			read_extent_buffer(eb, namebuf,
 					(unsigned long)extref->name, len);
-			printf(
-			"\t\tindex %llu parent %llu namelen %u name: %.*s\n",
-				index, parent_objid, name_len, len, namebuf);
+			printf("name: %.*s\n", len, namebuf);
 		}
 
 		len = sizeof(*extref) + name_len;
@@ -135,12 +141,15 @@ static void print_inode_ref_item(struct extent_buffer *eb, u32 size,
 		name_len = btrfs_inode_ref_name_len(eb, ref);
 		index = btrfs_inode_ref_index(eb, ref);
 		len = (name_len <= sizeof(namebuf))? name_len: sizeof(namebuf);
-		if (eb->fs_info && eb->fs_info->dont_print_filename) {
-			printf("\t\tindex %llu namelen %u\n", index, name_len);
+
+		printf("\t\tindex %llu namelen %u ",
+		       (unsigned long long)index, name_len);
+		if (eb->fs_info && eb->fs_info->hide_names) {
+			printf("name: HIDDEN\n");
 		} else {
-			read_extent_buffer(eb, namebuf, (unsigned long)(ref + 1), len);
-			printf("\t\tindex %llu namelen %u name: %.*s\n",
-		       (unsigned long long)index, name_len, len, namebuf);
+			read_extent_buffer(eb, namebuf,
+					(unsigned long)(ref + 1), len);
+			printf("name: %.*s\n", len, namebuf);
 		}
 		len = sizeof(*ref) + name_len;
 		ref = (struct btrfs_inode_ref *)((char *)ref + len);