btrfsprogs: btrfstune support for extended inode refs

This patch adds an option to btrfstune, '-r' which will enable the extended
inode refs flag on the provided btrfs superblock. We don't have a disable
option at the moment as that would require far more work.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>

diff --git a/btrfstune.c b/btrfstune.c
index 6950f74..6e68bda 100644 (file)
--- a/btrfstune.c
+++ b/btrfstune.c
@@ -65,22 +65,40 @@ int update_seeding_flag(struct btrfs_root *root, int set_flag)
        return 0;
 }
 
+int enable_extrefs_flag(struct btrfs_root *root)
+{
+       struct btrfs_trans_handle *trans;
+       struct btrfs_super_block *disk_super;
+       u64 super_flags;
+
+       disk_super = &root->fs_info->super_copy;
+       super_flags = btrfs_super_incompat_flags(disk_super);
+       super_flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF;
+       trans = btrfs_start_transaction(root, 1);
+       btrfs_set_super_incompat_flags(disk_super, super_flags);
+       btrfs_commit_transaction(trans, root);
+
+       return 0;
+}
+
 static void print_usage(void)
 {
        fprintf(stderr, "usage: btrfstune [options] device\n");
        fprintf(stderr, "\t-S value\tenable/disable seeding\n");
+       fprintf(stderr, "\t-r \t\tenable extended inode refs\n");
 }
 
 int main(int argc, char *argv[])
 {
        struct btrfs_root *root;
        int success = 0;
+       int extrefs_flag = 0;
        int seeding_flag = 0;
        int seeding_value = 0;
        int ret;
 
        while(1) {
-               int c = getopt(argc, argv, "S:");
+               int c = getopt(argc, argv, "S:r");
                if (c < 0)
                        break;
                switch(c) {
@@ -88,6 +106,9 @@ int main(int argc, char *argv[])
                        seeding_flag = 1;
                        seeding_value = atoi(optarg);
                        break;
+               case 'r':
+                       extrefs_flag = 1;
+                       break;
                default:
                        print_usage();
                        return 1;
@@ -119,6 +140,11 @@ int main(int argc, char *argv[])
                        success++;
        }
 
+       if (extrefs_flag) {
+               enable_extrefs_flag(root);
+               success++;
+       }
+
        if (success > 0) {
                ret = 0;
        } else {