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Mon, 21 Jan 2019 17:46:05 +0000 Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id x0LHk4Va022548 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 21 Jan 2019 17:46:04 GMT Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x0LHk4Jw023667; Mon, 21 Jan 2019 17:46:04 GMT Received: from [192.168.1.93] (/99.156.91.244) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 21 Jan 2019 09:46:03 -0800 Subject: Re: [PATCH v1] fs/jfs: Switch to use new generic UUID API To: Christoph Hellwig Cc: Andy Shevchenko , linux-kernel@vger.kernel.org, jfs-discussion@lists.sourceforge.net References: <20190110134153.83901-1-andriy.shevchenko@linux.intel.com> <20190121084950.GG18680@lst.de> <6ccf3581-71b8-6502-5050-643006423a63@oracle.com> <20190121162338.GA29537@lst.de> From: Dave Kleikamp Openpgp: preference=signencrypt Autocrypt: addr=dave.kleikamp@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190121162338.GA29537@lst.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9143 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=798 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901210139 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/21/19 10:23 AM, Christoph Hellwig wrote: > On Mon, Jan 21, 2019 at 10:19:15AM -0600, Dave Kleikamp wrote: >> diff --git a/fs/jfs/super.c b/fs/jfs/super.c >> index 65d8fc87ab11..c15ff56a8516 100644 >> --- a/fs/jfs/super.c >> +++ b/fs/jfs/super.c >> @@ -174,9 +174,11 @@ static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) >> buf->f_files = maxinodes; >> buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - >> atomic_read(&imap->im_numfree)); >> - buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); >> - buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, >> - sizeof(sbi->uuid)/2); >> + buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid, >> + sizeof(sbi->uuid)/2); >> + buf->f_fsid.val[1] = crc32_le(0, >> + (char *)&sbi->uuid + sizeof(sbi->uuid)/2, >> + sizeof(sbi->uuid)/2); > > I'd really love to see a little helper to calculate the fsid, and > a comment on that function documenting the design decision behind it. I can do that. It was a long time ago, but I'm sure the design decision was that I took the idea from another filesystem, possibly reiserfs, but I'll make a better case than that. :-) Shaggy