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Wong" To: Christoph Hellwig Subject: Re: [RFC PATCH 0/7] xfs: add reflink & dedupe support for fsdax. Message-ID: <20191009171152.GF13108@magnolia> References: <20190731114935.11030-1-ruansy.fnst@cn.fujitsu.com> <20191009063144.GA4300@infradead.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191009063144.GA4300@infradead.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9405 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=843 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910090148 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9405 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=930 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910090148 Message-ID-Hash: XK6RH5KY27D3YXUNVYKIIHDQBV754FLM X-Message-ID-Hash: XK6RH5KY27D3YXUNVYKIIHDQBV754FLM X-MailFrom: darrick.wong@oracle.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: linux-xfs@vger.kernel.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, rgoldwyn@suse.de, gujx@cn.fujitsu.com, david@fromorbit.com, qi.fuli@fujitsu.com X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Tue, Oct 08, 2019 at 11:31:44PM -0700, Christoph Hellwig wrote: > Btw, I just had a chat with Dan last week on this. And he pointed out > that while this series deals with the read/write path issues of > reflink on DAX it doesn't deal with the mmap side issue that > page->mapping and page->index can point back to exactly one file. > > I think we want a few xfstests that reflink a file and then use the > different links using mmap, as that should blow up pretty reliably. Hmm, you're right, we don't actually have a test that checks the behavior of mwriting all copies of a shared block. Ok, I'll go write one. --D _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org