2 * Copyright (C) 2008 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 500
23 #include <sys/types.h>
28 #include "kerncompat.h"
31 #include "transaction.h"
37 static int update_seeding_flag(struct btrfs_root
*root
, int set_flag
)
39 struct btrfs_trans_handle
*trans
;
40 struct btrfs_super_block
*disk_super
;
43 disk_super
= root
->fs_info
->super_copy
;
44 super_flags
= btrfs_super_flags(disk_super
);
46 if (super_flags
& BTRFS_SUPER_FLAG_SEEDING
) {
47 fprintf(stderr
, "seeding flag is already set on %s\n",
51 super_flags
|= BTRFS_SUPER_FLAG_SEEDING
;
53 if (!(super_flags
& BTRFS_SUPER_FLAG_SEEDING
)) {
54 fprintf(stderr
, "seeding flag is not set on %s\n",
58 super_flags
&= ~BTRFS_SUPER_FLAG_SEEDING
;
61 trans
= btrfs_start_transaction(root
, 1);
62 btrfs_set_super_flags(disk_super
, super_flags
);
63 btrfs_commit_transaction(trans
, root
);
68 static int enable_extrefs_flag(struct btrfs_root
*root
)
70 struct btrfs_trans_handle
*trans
;
71 struct btrfs_super_block
*disk_super
;
74 disk_super
= root
->fs_info
->super_copy
;
75 super_flags
= btrfs_super_incompat_flags(disk_super
);
76 super_flags
|= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF
;
77 trans
= btrfs_start_transaction(root
, 1);
78 btrfs_set_super_incompat_flags(disk_super
, super_flags
);
79 btrfs_commit_transaction(trans
, root
);
84 static int enable_skinny_metadata(struct btrfs_root
*root
)
86 struct btrfs_trans_handle
*trans
;
87 struct btrfs_super_block
*disk_super
;
90 disk_super
= root
->fs_info
->super_copy
;
91 super_flags
= btrfs_super_incompat_flags(disk_super
);
92 super_flags
|= BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
;
93 trans
= btrfs_start_transaction(root
, 1);
94 btrfs_set_super_incompat_flags(disk_super
, super_flags
);
95 btrfs_commit_transaction(trans
, root
);
100 static void print_usage(void)
102 fprintf(stderr
, "usage: btrfstune [options] device\n");
103 fprintf(stderr
, "\t-S value\tenable/disable seeding\n");
104 fprintf(stderr
, "\t-r \t\tenable extended inode refs\n");
105 fprintf(stderr
, "\t-x enable skinny metadata extent refs\n");
108 int main(int argc
, char *argv
[])
110 struct btrfs_root
*root
;
112 int extrefs_flag
= 0;
113 int seeding_flag
= 0;
114 u64 seeding_value
= 0;
120 int c
= getopt(argc
, argv
, "S:rx");
126 seeding_value
= arg_strtou64(optarg
);
140 argc
= argc
- optind
;
141 device
= argv
[optind
];
147 if (!(seeding_flag
+ extrefs_flag
+ skinny_flag
)) {
149 "ERROR: At least one option should be assigned.\n");
154 ret
= check_mounted(device
);
156 fprintf(stderr
, "Could not check mount status: %s\n",
160 fprintf(stderr
, "%s is mounted\n", device
);
164 root
= open_ctree(device
, 0, OPEN_CTREE_WRITES
);
167 fprintf(stderr
, "Open ctree failed\n");
172 ret
= update_seeding_flag(root
, seeding_value
);
178 enable_extrefs_flag(root
);
183 enable_skinny_metadata(root
);
190 root
->fs_info
->readonly
= 1;
192 fprintf(stderr
, "btrfstune failed\n");