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[2003:dc:6f1d:f00:230:64ff:fe74:809]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b797e5cd5sm30266815e9.22.2025.08.28.05.04.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Aug 2025 05:04:57 -0700 (PDT) From: Max Kellermann To: Slava.Dubeyko@ibm.com, xiubli@redhat.com, idryomov@gmail.com, amarkuze@redhat.com, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Max Kellermann Subject: [PATCH] fs/ceph/addr: convert `op_idx`, `data_pages` back to a local variables Date: Thu, 28 Aug 2025 14:04:53 +0200 Message-ID: <20250828120453.748058-1-max.kellermann@ionos.com> X-Mailer: git-send-email 2.47.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" These were local variables until commit f08068df4aa4 ("ceph: extend ceph_writeback_ctl for ceph_writepages_start() refactoring"), but were moved to the struct ceph_writeback_ctl for no obvious reason. Having these in a struct means overhead, so let's move them back. For the "allocate new pages array for next request" code block, however I decided to introduce a new local variable `old_pages` instead, because reusing `data_pages` for reallocation seemed confusing to me. Signed-off-by: Max Kellermann --- fs/ceph/addr.c | 39 ++++++++++++++++++++------------------- 1 file changed, 20 insertions(+), 19 deletions(-) diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 8b202d789e93..fc3192c79072 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -611,7 +611,6 @@ struct ceph_writeback_ctl =20 bool from_pool; struct page **pages; - struct page **data_pages; }; =20 /* @@ -1051,7 +1050,6 @@ void ceph_init_writeback_ctl(struct address_space *ma= pping, ceph_wbc->tag =3D PAGECACHE_TAG_DIRTY; } =20 - ceph_wbc->op_idx =3D -1; ceph_wbc->num_ops =3D 0; ceph_wbc->offset =3D 0; ceph_wbc->len =3D 0; @@ -1060,7 +1058,6 @@ void ceph_init_writeback_ctl(struct address_space *ma= pping, ceph_folio_batch_init(ceph_wbc); =20 ceph_wbc->pages =3D NULL; - ceph_wbc->data_pages =3D NULL; } =20 static inline @@ -1417,10 +1414,12 @@ int ceph_submit_write(struct address_space *mapping, struct ceph_vino vino =3D ceph_vino(inode); struct ceph_osd_request *req =3D NULL; struct page *page =3D NULL; + struct page **data_pages; bool caching =3D ceph_is_cache_enabled(inode); u64 offset; u64 len; unsigned i; + unsigned op_idx; =20 new_request: offset =3D ceph_fscrypt_page_offset(ceph_wbc->pages[0]); @@ -1481,8 +1480,8 @@ int ceph_submit_write(struct address_space *mapping, =20 /* Format the osd request message and submit the write */ len =3D 0; - ceph_wbc->data_pages =3D ceph_wbc->pages; - ceph_wbc->op_idx =3D 0; + data_pages =3D ceph_wbc->pages; + op_idx =3D 0; for (i =3D 0; i < ceph_wbc->locked_pages; i++) { u64 cur_offset; =20 @@ -1495,29 +1494,29 @@ int ceph_submit_write(struct address_space *mapping, */ if (offset + len !=3D cur_offset) { /* If it's full, stop here */ - if (ceph_wbc->op_idx + 1 =3D=3D req->r_num_ops) + if (op_idx + 1 =3D=3D req->r_num_ops) break; =20 /* Kick off an fscache write with what we have so far. */ ceph_fscache_write_to_cache(inode, offset, len, caching); =20 /* Start a new extent */ - osd_req_op_extent_dup_last(req, ceph_wbc->op_idx, + osd_req_op_extent_dup_last(req, op_idx, cur_offset - offset); =20 doutc(cl, "got pages at %llu~%llu\n", offset, len); =20 - osd_req_op_extent_osd_data_pages(req, ceph_wbc->op_idx, - ceph_wbc->data_pages, + osd_req_op_extent_osd_data_pages(req, op_idx, + data_pages, len, 0, ceph_wbc->from_pool, false); - osd_req_op_extent_update(req, ceph_wbc->op_idx, len); + osd_req_op_extent_update(req, op_idx, len); =20 len =3D 0; offset =3D cur_offset; - ceph_wbc->data_pages =3D ceph_wbc->pages + i; - ceph_wbc->op_idx++; + data_pages =3D ceph_wbc->pages + i; + op_idx++; } =20 set_page_writeback(page); @@ -1555,25 +1554,27 @@ int ceph_submit_write(struct address_space *mapping, offset, len); } =20 - osd_req_op_extent_osd_data_pages(req, ceph_wbc->op_idx, - ceph_wbc->data_pages, len, + osd_req_op_extent_osd_data_pages(req, op_idx, + data_pages, len, 0, ceph_wbc->from_pool, false); - osd_req_op_extent_update(req, ceph_wbc->op_idx, len); + osd_req_op_extent_update(req, op_idx, len); =20 - BUG_ON(ceph_wbc->op_idx + 1 !=3D req->r_num_ops); + BUG_ON(op_idx + 1 !=3D req->r_num_ops); =20 ceph_wbc->from_pool =3D false; if (i < ceph_wbc->locked_pages) { + struct page **old_pages; + BUG_ON(ceph_wbc->num_ops <=3D req->r_num_ops); ceph_wbc->num_ops -=3D req->r_num_ops; ceph_wbc->locked_pages -=3D i; =20 /* allocate new pages array for next request */ - ceph_wbc->data_pages =3D ceph_wbc->pages; + old_pages =3D ceph_wbc->pages; __ceph_allocate_page_array(ceph_wbc, ceph_wbc->locked_pages); - memcpy(ceph_wbc->pages, ceph_wbc->data_pages + i, + memcpy(ceph_wbc->pages, old_pages + i, ceph_wbc->locked_pages * sizeof(*ceph_wbc->pages)); - memset(ceph_wbc->data_pages + i, 0, + memset(old_pages + i, 0, ceph_wbc->locked_pages * sizeof(*ceph_wbc->pages)); } else { BUG_ON(ceph_wbc->num_ops !=3D req->r_num_ops); --=20 2.47.2