linux-kernel - Re: [PATCH v20 13/32] ceph: Provide a splice-read stub

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Message-ID: <1743656.1684488288@warthog.procyon.org.uk>
Date:   Fri, 19 May 2023 10:24:48 +0100
From:   David Howells <dhowells@...hat.com>
To:     Xiubo Li <xiubli@...hat.com>
Cc:     dhowells@...hat.com, Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Christoph Hellwig <hch@....de>,
        Ilya Dryomov <idryomov@...il.com>, ceph-devel@...r.kernel.org
Subject: Re: [PATCH v20 13/32] ceph: Provide a splice-read stub

Xiubo Li <xiubli@...hat.com> 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?

David