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
;
59 fprintf(stderr
, "Warning: Seeding flag cleared.\n");
62 trans
= btrfs_start_transaction(root
, 1);
63 btrfs_set_super_flags(disk_super
, super_flags
);
64 btrfs_commit_transaction(trans
, root
);
69 static int enable_extrefs_flag(struct btrfs_root
*root
)
71 struct btrfs_trans_handle
*trans
;
72 struct btrfs_super_block
*disk_super
;
75 disk_super
= root
->fs_info
->super_copy
;
76 super_flags
= btrfs_super_incompat_flags(disk_super
);
77 super_flags
|= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF
;
78 trans
= btrfs_start_transaction(root
, 1);
79 btrfs_set_super_incompat_flags(disk_super
, super_flags
);
80 btrfs_commit_transaction(trans
, root
);
85 static int enable_skinny_metadata(struct btrfs_root
*root
)
87 struct btrfs_trans_handle
*trans
;
88 struct btrfs_super_block
*disk_super
;
91 disk_super
= root
->fs_info
->super_copy
;
92 super_flags
= btrfs_super_incompat_flags(disk_super
);
93 super_flags
|= BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA
;
94 trans
= btrfs_start_transaction(root
, 1);
95 btrfs_set_super_incompat_flags(disk_super
, super_flags
);
96 btrfs_commit_transaction(trans
, root
);
101 static void print_usage(void)
103 fprintf(stderr
, "usage: btrfstune [options] device\n");
104 fprintf(stderr
, "\t-S value\tpositive value will enable seeding, zero to disable, negative is not allowed\n");
105 fprintf(stderr
, "\t-r \t\tenable extended inode refs\n");
106 fprintf(stderr
, "\t-x \t\tenable skinny metadata extent refs\n");
107 fprintf(stderr
, "\t-f \t\tforce to clear flags, make sure that you are aware of the dangers\n");
110 int main(int argc
, char *argv
[])
112 struct btrfs_root
*root
;
114 int extrefs_flag
= 0;
115 int seeding_flag
= 0;
116 u64 seeding_value
= 0;
123 int c
= getopt(argc
, argv
, "S:rxf");
129 seeding_value
= arg_strtou64(optarg
);
147 argc
= argc
- optind
;
148 device
= argv
[optind
];
149 if (check_argc_exact(argc
, 1)) {
154 if (!(seeding_flag
+ extrefs_flag
+ skinny_flag
)) {
156 "ERROR: At least one option should be assigned.\n");
161 ret
= check_mounted(device
);
163 fprintf(stderr
, "Could not check mount status: %s\n",
167 fprintf(stderr
, "%s is mounted\n", device
);
171 root
= open_ctree(device
, 0, OPEN_CTREE_WRITES
);
174 fprintf(stderr
, "Open ctree failed\n");
179 if (!seeding_value
&& !force
) {
180 fprintf(stderr
, "Warning: This is dangerous, clearing the seeding flag may cause the derived device not to be mountable!\n");
181 ret
= ask_user("We are going to clear the seeding flag, are you sure?");
183 fprintf(stderr
, "Clear seeding flag canceled\n");
188 ret
= update_seeding_flag(root
, seeding_value
);
194 enable_extrefs_flag(root
);
199 enable_skinny_metadata(root
);
206 root
->fs_info
->readonly
= 1;
208 fprintf(stderr
, "btrfstune failed\n");