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Sun, 21 May 2023 18:53:38 -0700 (PDT) Message-ID: Date: Mon, 22 May 2023 09:53:28 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v20 13/32] ceph: Provide a splice-read stub Content-Language: en-US To: David Howells Cc: Jens Axboe , Al Viro , Christoph Hellwig , Matthew Wilcox , Jan Kara , Jeff Layton , David Hildenbrand , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , Ilya Dryomov , ceph-devel@vger.kernel.org References: <20230519074047.1739879-1-dhowells@redhat.com> <20230519074047.1739879-14-dhowells@redhat.com> <1743656.1684488288@warthog.procyon.org.uk> From: Xiubo Li In-Reply-To: <1743656.1684488288@warthog.procyon.org.uk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/19/23 17:24, David Howells wrote: > Xiubo Li wrote: > >>> + ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got); >>> + if (ret < 0) { >>> + ceph_end_io_read(inode); >>> + return ret; >>> + } >>> + >>> + if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) { >>> + dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n", >>> + inode, ceph_vinop(inode), *ppos, len, >>> + ceph_cap_string(got)); >>> + >>> + ceph_end_io_read(inode); >>> + return direct_splice_read(in, ppos, pipe, len, flags); >> Shouldn't we release cap ref before returning here ? > Ummm... Even if we got no caps? No, at least we have got the 'need' caps: CEPH_CAP_FILE_RD once here. I saw you have updated this and will check it. Thanks - Xiubo > > David >