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Btrfs: add skip_balance mount option

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Since restriper kthread starts involuntarily on mount and can suck cpu
and memory bandwidth add a mount option to forcefully skip it.  The
restriper in that case hangs around in paused state and can be resumed
from userspace when it's convenient.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2012-01-16 22:04:48 +02:00
parent 596410151e
commit 9555c6c180
3 changed files with 17 additions and 5 deletions
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10
fs/btrfs/volumes.c
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@@ -2707,15 +2707,19 @@ static int balance_kthread(void *data)
struct btrfs_balance_control *bctl =
(struct btrfs_balance_control *)data;
struct btrfs_fs_info *fs_info = bctl->fs_info;
int ret;
int ret = 0;
mutex_lock(&fs_info->volume_mutex);
mutex_lock(&fs_info->balance_mutex);
set_balance_control(bctl);
printk(KERN_INFO "btrfs: continuing balance\n");
ret = btrfs_balance(bctl, NULL);
if (btrfs_test_opt(fs_info->tree_root, SKIP_BALANCE)) {
printk(KERN_INFO "btrfs: force skipping balance\n");
} else {
printk(KERN_INFO "btrfs: continuing balance\n");
ret = btrfs_balance(bctl, NULL);
}
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);