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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>
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@ -3265,7 +3265,7 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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if (!capable(CAP_SYS_ADMIN))
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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return -EPERM;
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ret = mnt_want_write(file->f_path.mnt);
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ret = mnt_want_write_file(file);
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if (ret)
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if (ret)
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return ret;
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return ret;
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@ -3335,7 +3335,7 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg)
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out:
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out:
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mutex_unlock(&fs_info->balance_mutex);
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mutex_unlock(&fs_info->balance_mutex);
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mutex_unlock(&fs_info->volume_mutex);
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mutex_unlock(&fs_info->volume_mutex);
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mnt_drop_write(file->f_path.mnt);
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mnt_drop_write_file(file);
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return ret;
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return ret;
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}
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}
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