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Btrfs: allow for canceling restriper

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Implement an ioctl for canceling restriper.  Currently we wait until
relocation of the current block group is finished, in future this can be
done by triggering a commit.  Balance item is deleted and no memory
about the interrupted balance is kept.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2012-01-16 22:04:49 +02:00
parent 837d5b6e46
commit a7e99c691a
6 changed files with 53 additions and 3 deletions
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fs/btrfs/disk-io.c
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@ -2006,6 +2006,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
mutex_init(&fs_info->balance_mutex);
atomic_set(&fs_info->balance_running, 0);
atomic_set(&fs_info->balance_pause_req, 0);
atomic_set(&fs_info->balance_cancel_req, 0);
fs_info->balance_ctl = NULL;
init_waitqueue_head(&fs_info->balance_wait_q);