e2fsprogs: Add option `-0' to set default uid/gid to 0

Signed-off-by: hmz007 <hmz007@gmail.com>

external/e2fsprogs/misc/create_inode.c

@@ -42,6 +42,8 @@
 /* 64KiB is the minimum blksize to best minimize system call overhead. */
 #define COPY_FILE_BUFLEN	65536
 
+int	uses_default_owner = 0;
+
 static int ext2_file_type(unsigned int mode)
 {
 	if (LINUX_S_ISREG(mode))
@@ -120,10 +122,17 @@ static errcode_t set_inode_extra(ext2_filsys fs, ext2_ino_t ino,
 		return retval;
 	}
 
-	inode.i_uid = st->st_uid;
-	ext2fs_set_i_uid_high(inode, st->st_uid >> 16);
-	inode.i_gid = st->st_gid;
-	ext2fs_set_i_gid_high(inode, st->st_gid >> 16);
+	if (uses_default_owner) {
+		inode.i_uid = 0;
+		ext2fs_set_i_uid_high(inode, 0);
+		inode.i_gid = 0;
+		ext2fs_set_i_gid_high(inode, 0);
+	} else {
+		inode.i_uid = st->st_uid;
+		ext2fs_set_i_uid_high(inode, st->st_uid >> 16);
+		inode.i_gid = st->st_gid;
+		ext2fs_set_i_gid_high(inode, st->st_gid >> 16);
+	}
 	inode.i_mode = (LINUX_S_IFMT & inode.i_mode) | (~S_IFMT & st->st_mode);
 	inode.i_atime = st->st_atime;
 	inode.i_mtime = st->st_mtime;

external/e2fsprogs/misc/mke2fs.c

@@ -91,6 +91,7 @@ static int	noaction;
 static int	num_backups = 2; /* number of backup bg's for sparse_super2 */
 static uid_t	root_uid;
 static gid_t	root_gid;
+extern int	uses_default_owner;
 int	journal_size;
 int	journal_flags;
 int	journal_fc_size;
@@ -139,7 +140,7 @@ static void usage(void)
 	"[-r fs-revision] [-E extended-option[,...]]\n"
 	"\t[-t fs-type] [-T usage-type ] [-U UUID] [-e errors_behavior]"
 	"[-z undo_file]\n"
-	"\t[-jnqvDFSV] device [blocks-count]\n"),
+	"\t[-jnqvDFSV0] device [blocks-count]\n"),
 		program_name);
 	exit(1);
 }
@@ -1652,7 +1653,7 @@ profile_error:
 	}
 
 	while ((c = getopt (argc, argv,
-		    "b:cd:e:g:i:jl:m:no:qr:s:t:vC:DE:FG:I:J:KL:M:N:O:R:ST:U:Vz:")) != EOF) {
+		    "b:cd:e:g:i:jl:m:no:qr:s:t:vC:DE:FG:I:J:KL:M:N:O:R:ST:U:Vz:0")) != EOF) {
 		switch (c) {
 		case 'b':
 			blocksize = parse_num_blocks2(optarg, -1);
@@ -1897,6 +1898,10 @@ profile_error:
 		case 'z':
 			undo_file = optarg;
 			break;
+		case '0':
+			/* Set default owner/group id to 0 */
+			uses_default_owner = 1;
+			break;
 		default:
 			usage();
 		}