From patchwork Thu Dec 9 09:10:00 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Zefan X-Patchwork-Id: 393422 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oB998QrS030688 for ; Thu, 9 Dec 2010 09:08:26 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755360Ab0LIJIX (ORCPT ); Thu, 9 Dec 2010 04:08:23 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:65069 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751369Ab0LIJIW (ORCPT ); Thu, 9 Dec 2010 04:08:22 -0500 Received: from tang.cn.fujitsu.com (tang.cn.fujitsu.com [10.167.250.3]) by song.cn.fujitsu.com (Postfix) with ESMTP id 75C01170DAB for ; Thu, 9 Dec 2010 17:08:20 +0800 (CST) Received: from mailserver.fnst.cn.fujitus.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id oB993blR015302 for ; Thu, 9 Dec 2010 17:03:37 +0800 Received: from lizf.localdomain ([10.167.225.51]) by mailserver.fnst.cn.fujitus.com (Lotus Domino Release 8.5.1FP4) with ESMTP id 2010120917082483-196890 ; Thu, 9 Dec 2010 17:08:24 +0800 Message-ID: <4D009CE8.6030208@cn.fujitsu.com> Date: Thu, 09 Dec 2010 17:10:00 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: "linux-btrfs@vger.kernel.org" Subject: [PATCH v2 1/5] Btrfs: Make async snapshot ioctl more generic References: <4D009CD2.3060805@cn.fujitsu.com> In-Reply-To: <4D009CD2.3060805@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2010-12-09 17:08:24, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2010-12-09 17:08:25, Serialize complete at 2010-12-09 17:08:25 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Thu, 09 Dec 2010 09:08:27 +0000 (UTC) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index f1c9bb4..dc953bc 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -947,23 +947,31 @@ out: static noinline int btrfs_ioctl_snap_create(struct file *file, void __user *arg, int subvol, - int async) + bool v2) { struct btrfs_ioctl_vol_args *vol_args = NULL; - struct btrfs_ioctl_async_vol_args *async_vol_args = NULL; + struct btrfs_ioctl_vol_args_v2 *vol_args_v2 = NULL; char *name; u64 fd; u64 transid = 0; + bool async = false; int ret; - if (async) { - async_vol_args = memdup_user(arg, sizeof(*async_vol_args)); - if (IS_ERR(async_vol_args)) - return PTR_ERR(async_vol_args); + if (v2) { + vol_args_v2 = memdup_user(arg, sizeof(*vol_args_v2)); + if (IS_ERR(vol_args_v2)) + return PTR_ERR(vol_args_v2); - name = async_vol_args->name; - fd = async_vol_args->fd; - async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0'; + if (vol_args_v2->flags & ~BTRFS_SUBVOL_CREATE_SNAP_ASYNC) { + ret = -EINVAL; + goto out; + } + + name = vol_args_v2->name; + fd = vol_args_v2->fd; + vol_args_v2->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; + if (vol_args_v2->flags & BTRFS_SUBVOL_CREATE_SNAP_ASYNC) + async = true; } else { vol_args = memdup_user(arg, sizeof(*vol_args)); if (IS_ERR(vol_args)) @@ -978,13 +986,13 @@ static noinline int btrfs_ioctl_snap_create(struct file *file, if (!ret && async) { if (copy_to_user(arg + - offsetof(struct btrfs_ioctl_async_vol_args, + offsetof(struct btrfs_ioctl_vol_args_v2, transid), &transid, sizeof(transid))) return -EFAULT; } - +out: kfree(vol_args); - kfree(async_vol_args); + kfree(vol_args_v2); return ret; } @@ -2246,7 +2254,7 @@ long btrfs_ioctl(struct file *file, unsigned int return btrfs_ioctl_getversion(file, argp); case BTRFS_IOC_SNAP_CREATE: return btrfs_ioctl_snap_create(file, argp, 0, 0); - case BTRFS_IOC_SNAP_CREATE_ASYNC: + case BTRFS_IOC_SNAP_CREATE_V2: return btrfs_ioctl_snap_create(file, argp, 0, 1); case BTRFS_IOC_SUBVOL_CREATE: return btrfs_ioctl_snap_create(file, argp, 1, 0); diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h index 17c99eb..9affc49 100644 --- a/fs/btrfs/ioctl.h +++ b/fs/btrfs/ioctl.h @@ -30,11 +30,15 @@ struct btrfs_ioctl_vol_args { char name[BTRFS_PATH_NAME_MAX + 1]; }; -#define BTRFS_SNAPSHOT_NAME_MAX 4079 -struct btrfs_ioctl_async_vol_args { +#define BTRFS_SUBVOL_CREATE_SNAP_ASYNC (1ULL << 0) + +#define BTRFS_SUBVOL_NAME_MAX 4039 +struct btrfs_ioctl_vol_args_v2 { __s64 fd; __u64 transid; - char name[BTRFS_SNAPSHOT_NAME_MAX + 1]; + __u64 flags; + __u64 unused[4]; + char name[BTRFS_SUBVOL_NAME_MAX + 1]; }; #define BTRFS_INO_LOOKUP_PATH_MAX 4080 @@ -187,6 +191,6 @@ struct btrfs_ioctl_space_args { struct btrfs_ioctl_space_args) #define BTRFS_IOC_START_SYNC _IOR(BTRFS_IOCTL_MAGIC, 24, __u64) #define BTRFS_IOC_WAIT_SYNC _IOW(BTRFS_IOCTL_MAGIC, 22, __u64) -#define BTRFS_IOC_SNAP_CREATE_ASYNC _IOW(BTRFS_IOCTL_MAGIC, 23, \ - struct btrfs_ioctl_async_vol_args) +#define BTRFS_IOC_SNAP_CREATE_V2 _IOW(BTRFS_IOCTL_MAGIC, 23, \ + struct btrfs_ioctl_vol_args_v2) #endif