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[209.132.180.67]) by mx.google.com with ESMTP id d20si3947036oic.40.2020.01.09.09.23.19; Thu, 09 Jan 2020 09:23:31 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731677AbgAIOaz (ORCPT + 99 others); Thu, 9 Jan 2020 09:30:55 -0500 Received: from mx2.suse.de ([195.135.220.15]:60052 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727854AbgAIOay (ORCPT ); Thu, 9 Jan 2020 09:30:54 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id C7159AFEC; Thu, 9 Jan 2020 14:30:51 +0000 (UTC) Date: Thu, 9 Jan 2020 14:30:50 +0000 From: Luis Henriques To: Jeff Layton Cc: Sage Weil , Ilya Dryomov , "Yan, Zheng" , Gregory Farnum , ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH v4] ceph: use 'copy-from2' operation in copy_file_range Message-ID: <20200109143011.GA14582@brahms> References: <20200108100353.23770-1-lhenriques@suse.com> <913eb28e6bb698f27f1831f75ea5250497ee659c.camel@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <913eb28e6bb698f27f1831f75ea5250497ee659c.camel@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 09, 2020 at 08:06:17AM -0500, Jeff Layton wrote: > On Wed, 2020-01-08 at 10:03 +0000, Luis Henriques wrote: > > Instead of using the 'copy-from' operation, switch copy_file_range to the > > new 'copy-from2' operation, which allows to send the truncate_seq and > > truncate_size parameters. > > > > If an OSD does not support the 'copy-from2' operation it will return > > -EOPNOTSUPP. In that case, the kernel client will stop trying to do > > remote object copies for this fs client and will always use the generic > > VFS copy_file_range. > > > > Signed-off-by: Luis Henriques > > --- > > Hi Jeff, > > > > This is a follow-up to the discussion in [1]. Since PR [2] has been > > merged, it's now time to change the kernel client to use the new > > 'copy-from2'. And that's what this patch does. > > > > [1] https://lore.kernel.org/lkml/20191118120935.7013-1-lhenriques@suse.com/ > > [2] https://github.com/ceph/ceph/pull/31728 > > > > fs/ceph/file.c | 13 ++++++++++++- > > fs/ceph/super.c | 1 + > > fs/ceph/super.h | 3 +++ > > include/linux/ceph/osd_client.h | 1 + > > include/linux/ceph/rados.h | 2 ++ > > net/ceph/osd_client.c | 18 ++++++++++++------ > > 6 files changed, 31 insertions(+), 7 deletions(-) > > > > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > > index 11929d2bb594..1e6cdf2dfe90 100644 > > --- a/fs/ceph/file.c > > +++ b/fs/ceph/file.c > > @@ -1974,6 +1974,10 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off, > > if (ceph_test_mount_opt(src_fsc, NOCOPYFROM)) > > return -EOPNOTSUPP; > > > > + /* Do the OSDs support the 'copy-from2' operation? */ > > + if (!src_fsc->have_copy_from2) > > + return -EOPNOTSUPP; > > + > > /* > > * Striped file layouts require that we copy partial objects, but the > > * OSD copy-from operation only supports full-object copies. Limit > > @@ -2101,8 +2105,15 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off, > > CEPH_OSD_OP_FLAG_FADVISE_NOCACHE, > > &dst_oid, &dst_oloc, > > CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL | > > - CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0); > > + CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, > > + dst_ci->i_truncate_seq, dst_ci->i_truncate_size, > > + CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ); > > if (err) { > > + if (err == -EOPNOTSUPP) { > > + src_fsc->have_copy_from2 = false; > > + pr_notice("OSDs don't support 'copy-from2'; " > > + "disabling copy_file_range\n"); > > + } > > dout("ceph_osdc_copy_from returned %d\n", err); > > if (!ret) > > ret = err; > > The patch itself looks fine to me. I'll not merge yet, since you sent it > as an RFC, but I don't have any objection to it at first glance. I was going to drop the RFC, but then at the last minute decided to leave. > The > only other comment I'd make is that you should probably split this into > two patches -- one for the libceph changes and one for cephfs. Hmm... TBH I didn't thought about that, but since the libceph patch would be changing its API (ceph_osdc_copy_from would have 2 extra parameters), I don't think that's a good idea. Bisection would be broken between these 2 patches. > > On a related note, I wonder if we'd get better performance out of large > copy_file_range calls here if you were to move the wait for all of these > osd requests after issuing them all in parallel? > > Currently we're doing: > > copy_from > wait > copy_from > wait > > ...but figure that the second copy_from might very well be between osds > that are not involved in the first copy. There's no reason to do them > sequentially. It'd be better to issue all of the OSD requests first, and > then wait on all of the replies in turn: > > copy_from > copy_from > copy_from > ... > wait > wait > wait Ah! It looks like you've been looking into my TODO list :-) In fact I was discussing copy_file_range performance with some colleagues just before the EOY break and one of the things I had decided to experiment was to parallelize the 'copy-from' requests. I haven't looked yet at the details, but I expect to be looking into that soon(ish). Thanks for your review and suggestion. Cheers, -- Lu?s > > > diff --git a/fs/ceph/super.c b/fs/ceph/super.c > > index 29a795f975df..b62c487a53af 100644 > > --- a/fs/ceph/super.c > > +++ b/fs/ceph/super.c > > @@ -637,6 +637,7 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, > > fsc->sb = NULL; > > fsc->mount_state = CEPH_MOUNT_MOUNTING; > > fsc->filp_gen = 1; > > + fsc->have_copy_from2 = true; > > > > atomic_long_set(&fsc->writeback_count, 0); > > > > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > > index 3bf1a01cd536..b2f86bed5c2c 100644 > > --- a/fs/ceph/super.h > > +++ b/fs/ceph/super.h > > @@ -106,6 +106,9 @@ struct ceph_fs_client { > > unsigned long last_auto_reconnect; > > bool blacklisted; > > > > + /* Do the OSDs support the 'copy-from2' Op? */ > > + bool have_copy_from2; > > + > > u32 filp_gen; > > loff_t max_file_size; > > > > diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h > > index eaffbdddf89a..5a62dbd3f4c2 100644 > > --- a/include/linux/ceph/osd_client.h > > +++ b/include/linux/ceph/osd_client.h > > @@ -534,6 +534,7 @@ int ceph_osdc_copy_from(struct ceph_osd_client *osdc, > > struct ceph_object_id *dst_oid, > > struct ceph_object_locator *dst_oloc, > > u32 dst_fadvise_flags, > > + u32 truncate_seq, u64 truncate_size, > > u8 copy_from_flags); > > > > /* watch/notify */ > > diff --git a/include/linux/ceph/rados.h b/include/linux/ceph/rados.h > > index 3eb0e55665b4..59bdfd470100 100644 > > --- a/include/linux/ceph/rados.h > > +++ b/include/linux/ceph/rados.h > > @@ -256,6 +256,7 @@ extern const char *ceph_osd_state_name(int s); > > \ > > /* tiering */ \ > > f(COPY_FROM, __CEPH_OSD_OP(WR, DATA, 26), "copy-from") \ > > + f(COPY_FROM2, __CEPH_OSD_OP(WR, DATA, 45), "copy-from2") \ > > f(COPY_GET_CLASSIC, __CEPH_OSD_OP(RD, DATA, 27), "copy-get-classic") \ > > f(UNDIRTY, __CEPH_OSD_OP(WR, DATA, 28), "undirty") \ > > f(ISDIRTY, __CEPH_OSD_OP(RD, DATA, 29), "isdirty") \ > > @@ -446,6 +447,7 @@ enum { > > CEPH_OSD_COPY_FROM_FLAG_MAP_SNAP_CLONE = 8, /* map snap direct to > > * cloneid */ > > CEPH_OSD_COPY_FROM_FLAG_RWORDERED = 16, /* order with write */ > > + CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ = 32, /* send truncate_{seq,size} */ > > }; > > > > enum { > > diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c > > index ba45b074a362..b68b376d8c2f 100644 > > --- a/net/ceph/osd_client.c > > +++ b/net/ceph/osd_client.c > > @@ -402,7 +402,7 @@ static void osd_req_op_data_release(struct ceph_osd_request *osd_req, > > case CEPH_OSD_OP_LIST_WATCHERS: > > ceph_osd_data_release(&op->list_watchers.response_data); > > break; > > - case CEPH_OSD_OP_COPY_FROM: > > + case CEPH_OSD_OP_COPY_FROM2: > > ceph_osd_data_release(&op->copy_from.osd_data); > > break; > > default: > > @@ -697,7 +697,7 @@ static void get_num_data_items(struct ceph_osd_request *req, > > case CEPH_OSD_OP_SETXATTR: > > case CEPH_OSD_OP_CMPXATTR: > > case CEPH_OSD_OP_NOTIFY_ACK: > > - case CEPH_OSD_OP_COPY_FROM: > > + case CEPH_OSD_OP_COPY_FROM2: > > *num_request_data_items += 1; > > break; > > > > @@ -1029,7 +1029,7 @@ static u32 osd_req_encode_op(struct ceph_osd_op *dst, > > case CEPH_OSD_OP_CREATE: > > case CEPH_OSD_OP_DELETE: > > break; > > - case CEPH_OSD_OP_COPY_FROM: > > + case CEPH_OSD_OP_COPY_FROM2: > > dst->copy_from.snapid = cpu_to_le64(src->copy_from.snapid); > > dst->copy_from.src_version = > > cpu_to_le64(src->copy_from.src_version); > > @@ -1966,7 +1966,7 @@ static void setup_request_data(struct ceph_osd_request *req) > > ceph_osdc_msg_data_add(request_msg, > > &op->notify_ack.request_data); > > break; > > - case CEPH_OSD_OP_COPY_FROM: > > + case CEPH_OSD_OP_COPY_FROM2: > > ceph_osdc_msg_data_add(request_msg, > > &op->copy_from.osd_data); > > break; > > @@ -5315,6 +5315,7 @@ static int osd_req_op_copy_from_init(struct ceph_osd_request *req, > > struct ceph_object_locator *src_oloc, > > u32 src_fadvise_flags, > > u32 dst_fadvise_flags, > > + u32 truncate_seq, u64 truncate_size, > > u8 copy_from_flags) > > { > > struct ceph_osd_req_op *op; > > @@ -5325,7 +5326,8 @@ static int osd_req_op_copy_from_init(struct ceph_osd_request *req, > > if (IS_ERR(pages)) > > return PTR_ERR(pages); > > > > - op = _osd_req_op_init(req, 0, CEPH_OSD_OP_COPY_FROM, dst_fadvise_flags); > > + op = _osd_req_op_init(req, 0, CEPH_OSD_OP_COPY_FROM2, > > + dst_fadvise_flags); > > op->copy_from.snapid = src_snapid; > > op->copy_from.src_version = src_version; > > op->copy_from.flags = copy_from_flags; > > @@ -5335,6 +5337,8 @@ static int osd_req_op_copy_from_init(struct ceph_osd_request *req, > > end = p + PAGE_SIZE; > > ceph_encode_string(&p, end, src_oid->name, src_oid->name_len); > > encode_oloc(&p, end, src_oloc); > > + ceph_encode_32(&p, truncate_seq); > > + ceph_encode_64(&p, truncate_size); > > op->indata_len = PAGE_SIZE - (end - p); > > > > ceph_osd_data_pages_init(&op->copy_from.osd_data, pages, > > @@ -5350,6 +5354,7 @@ int ceph_osdc_copy_from(struct ceph_osd_client *osdc, > > struct ceph_object_id *dst_oid, > > struct ceph_object_locator *dst_oloc, > > u32 dst_fadvise_flags, > > + u32 truncate_seq, u64 truncate_size, > > u8 copy_from_flags) > > { > > struct ceph_osd_request *req; > > @@ -5366,7 +5371,8 @@ int ceph_osdc_copy_from(struct ceph_osd_client *osdc, > > > > ret = osd_req_op_copy_from_init(req, src_snapid, src_version, src_oid, > > src_oloc, src_fadvise_flags, > > - dst_fadvise_flags, copy_from_flags); > > + dst_fadvise_flags, truncate_seq, > > + truncate_size, copy_from_flags); > > if (ret) > > goto out; > > > -- > Jeff Layton >