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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH] ceph: Make ceph_netfs_issue_op() handle inlined data (untested) From: David Howells To: jlayton@kernel.org Cc: ceph-devel@vger.kernel.org, idryomov@gmail.com, dhowells@redhat.com, linux-fsdevel@vger.kernel.org Date: Fri, 17 Dec 2021 20:13:06 +0000 Message-ID: <163977198611.2082978.4748242515627648240.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Here's a first stab at making ceph_netfs_issue_op() handle inlined data on page 0. The code that's upstream *ought* to be doing this in ceph_readpage() as the page isn't pinned and could get discarded under memory pressure from what I can see. Signed-off-by: David Howells cc: ceph-devel@vger.kernel.org --- fs/ceph/addr.c | 79 ++++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 62 insertions(+), 17 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 553e2b5653f3..b72f77fe32f2 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -244,6 +244,61 @@ static void finish_netfs_read(struct ceph_osd_request *req) iput(req->r_inode); } +static bool ceph_netfs_issue_op_inline(struct netfs_read_subrequest *subreq) +{ + struct netfs_read_request *rreq = subreq->rreq; + struct inode *inode = rreq->inode; + struct ceph_mds_reply_info_parsed *rinfo; + struct ceph_mds_reply_info_in *iinfo; + struct ceph_mds_request *req; + struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); + struct ceph_inode_info *ci = ceph_inode(inode); + struct iov_iter iter; + ssize_t err = 0; + size_t len; + + __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); + __clear_bit(NETFS_SREQ_WRITE_TO_CACHE, &subreq->flags); + + if (subreq->start >= inode->i_size || subreq->start >= 4096) + goto out; + + /* We need to fetch the inline data. */ + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + req->r_ino1 = ci->i_vino; + req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA); + req->r_num_caps = 2; + + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (err < 0) + goto out; + + rinfo = &req->r_reply_info; + iinfo = &rinfo->targeti; + if (iinfo->inline_version == CEPH_INLINE_NONE) { + /* The data got uninlined */ + ceph_mdsc_put_request(req); + return false; + } + + len = min_t(size_t, 4096 - subreq->start, iinfo->inline_len); + iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages, subreq->start, len); + + err = copy_to_iter(iinfo->inline_data, len, &iter); + if (err == 0) + err = -EFAULT; + + ceph_mdsc_put_request(req); + +out: + netfs_subreq_terminated(subreq, err, false); + return true; +} + static void ceph_netfs_issue_op(struct netfs_read_subrequest *subreq) { struct netfs_read_request *rreq = subreq->rreq; @@ -258,6 +313,10 @@ static void ceph_netfs_issue_op(struct netfs_read_subrequest *subreq) int err = 0; u64 len = subreq->len; + if (ci->i_inline_version != CEPH_INLINE_NONE && + ceph_netfs_issue_op_inline(subreq)) + return; + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, subreq->start, &len, 0, 1, CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica, @@ -331,23 +390,9 @@ static int ceph_readpage(struct file *file, struct page *subpage) size_t len = folio_size(folio); u64 off = folio_file_pos(folio); - if (ci->i_inline_version != CEPH_INLINE_NONE) { - /* - * Uptodate inline data should have been added - * into page cache while getting Fcr caps. - */ - if (off == 0) { - folio_unlock(folio); - return -EINVAL; - } - zero_user_segment(&folio->page, 0, folio_size(folio)); - folio_mark_uptodate(folio); - folio_unlock(folio); - return 0; - } - - dout("readpage ino %llx.%llx file %p off %llu len %zu folio %p index %lu\n", - vino.ino, vino.snap, file, off, len, folio, folio_index(folio)); + if (ci->i_inline_version == CEPH_INLINE_NONE) + dout("readpage ino %llx.%llx file %p off %llu len %zu folio %p index %lu\n", + vino.ino, vino.snap, file, off, len, folio, folio_index(folio)); return netfs_readpage(file, folio, &ceph_netfs_read_ops, NULL); }