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Btrfs: use mnt_want_write_file instead of mnt_want_write 

mnt_want_write_file is faster when file has been opened for write.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
This commit is contained in:
Liu Bo 2012-06-29 03:58:48 -06:00 committed by Chris Mason
parent 768e9dfe82
commit e54bfa3104
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/ioctl.c
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@ -3265,7 +3265,7 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = mnt_want_write(file->f_path.mnt);
ret = mnt_want_write_file(file);
if (ret)
return ret;
@ -3335,7 +3335,7 @@ out_bargs:
out:
mutex_unlock(&fs_info->balance_mutex);
mutex_unlock(&fs_info->volume_mutex);
mnt_drop_write(file->f_path.mnt);
mnt_drop_write_file(file);
return ret;
}