From patchwork Tue Apr 30 14:00:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13649195 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE20D1C68BF for ; Tue, 30 Apr 2024 14:03:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714485802; cv=none; b=l5CNNl+bmpDFRHrk/4m/LAoKMDLlG9TUzgLUZrrEFGZKSi5EPu9Ofjw8hT7nlooVOVs0V2ihCzR9mgbJivO1maFCbHV9yQ0Y6x1Su9SUpgbFELvB9O+J6F2o0cww/A6JJNA+ky3Z+Wp3H1TSikDrD5PgKpUS3ezttwg/rJw9wng= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714485802; c=relaxed/simple; bh=8afOTk1hCNwyiDkdpC7S3aAqtWqNHBMrTH4XYhTax/o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WZPQVODhVs61qizbbNVpapNpNltZaZHsep2caBZalCFb1CkGGFw2Rnv6BotucAyb6rZYXkgkD749g7IFaIXp7eC7FtAzswM8kqidlv2bbBL+yoPUTqSO6fTxQlW4r8mjuKuy4hNGJvJs6hHIslhBqGIEnX8rG9sWSEyy4wCLfFo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=ZGVZcfly; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZGVZcfly" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1714485792; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qE1/HtHVuJU+rtbpz3xCSVYRFSW0bV70oYKE7mzCMW8=; b=ZGVZcflyU4e3lDgfCJImLGwy0gdfvbKjRbPXml1qiFnl6K4PVpddTpBdp/2i8E8VdmyivX jlN3RlE832bvtym4dEtExMoCrJYqqANNUhjwb6DeeKNZ0rvOcKjaRpQdyT0TbCVZtjWBft MAOKZcTlCzvut/aXDddtue9ZSO2J3ss= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-179-0vr6Tfn5OwuKns5f4Dlwgw-1; Tue, 30 Apr 2024 10:03:05 -0400 X-MC-Unique: 0vr6Tfn5OwuKns5f4Dlwgw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 552003806233; Tue, 30 Apr 2024 14:02:40 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5DCE72166B32; Tue, 30 Apr 2024 14:02:37 +0000 (UTC) From: David Howells To: Christian Brauner , Jeff Layton , Gao Xiang , Dominique Martinet Cc: David Howells , Matthew Wilcox , Steve French , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Eric Van Hensbergen , Ilya Dryomov , netfs@lists.linux.dev, linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 22/22] netfs, afs: Use writeback retry to deal with alternate keys Date: Tue, 30 Apr 2024 15:00:53 +0100 Message-ID: <20240430140056.261997-23-dhowells@redhat.com> In-Reply-To: <20240430140056.261997-1-dhowells@redhat.com> References: <20240430140056.261997-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Use a hook in the new writeback code's retry algorithm to rotate the keys once all the outstanding subreqs have failed rather than doing it separately on each subreq. Signed-off-by: David Howells Reviewed-by: Jeff Layton cc: Marc Dionne cc: linux-afs@lists.infradead.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- Notes: Changes ======= ver #2) - Change a comma ending a statement to a semicolon. fs/afs/file.c | 1 + fs/afs/internal.h | 1 + fs/afs/write.c | 191 +++++++++++++++++++-------------------- fs/netfs/write_collect.c | 9 +- include/linux/netfs.h | 2 + 5 files changed, 104 insertions(+), 100 deletions(-) diff --git a/fs/afs/file.c b/fs/afs/file.c index 8f983e3ecae7..c3f0c45ae9a9 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -368,6 +368,7 @@ static int afs_check_write_begin(struct file *file, loff_t pos, unsigned len, static void afs_free_request(struct netfs_io_request *rreq) { key_put(rreq->netfs_priv); + afs_put_wb_key(rreq->netfs_priv2); } static void afs_update_i_size(struct inode *inode, loff_t new_i_size) diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 887245f9336d..6e1d3c4daf72 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -1601,6 +1601,7 @@ extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *); void afs_prepare_write(struct netfs_io_subrequest *subreq); void afs_issue_write(struct netfs_io_subrequest *subreq); void afs_begin_writeback(struct netfs_io_request *wreq); +void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream); extern int afs_writepages(struct address_space *, struct writeback_control *); extern int afs_fsync(struct file *, loff_t, loff_t, int); extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); diff --git a/fs/afs/write.c b/fs/afs/write.c index b8505a8b622a..e959640694c2 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -29,43 +29,39 @@ static void afs_pages_written_back(struct afs_vnode *vnode, loff_t start, unsign /* * Find a key to use for the writeback. We cached the keys used to author the - * writes on the vnode. *_wbk will contain the last writeback key used or NULL - * and we need to start from there if it's set. + * writes on the vnode. wreq->netfs_priv2 will contain the last writeback key + * record used or NULL and we need to start from there if it's set. + * wreq->netfs_priv will be set to the key itself or NULL. */ -static int afs_get_writeback_key(struct afs_vnode *vnode, - struct afs_wb_key **_wbk) +static void afs_get_writeback_key(struct netfs_io_request *wreq) { - struct afs_wb_key *wbk = NULL; - struct list_head *p; - int ret = -ENOKEY, ret2; + struct afs_wb_key *wbk, *old = wreq->netfs_priv2; + struct afs_vnode *vnode = AFS_FS_I(wreq->inode); + + key_put(wreq->netfs_priv); + wreq->netfs_priv = NULL; + wreq->netfs_priv2 = NULL; spin_lock(&vnode->wb_lock); - if (*_wbk) - p = (*_wbk)->vnode_link.next; + if (old) + wbk = list_next_entry(old, vnode_link); else - p = vnode->wb_keys.next; + wbk = list_first_entry(&vnode->wb_keys, struct afs_wb_key, vnode_link); - while (p != &vnode->wb_keys) { - wbk = list_entry(p, struct afs_wb_key, vnode_link); + list_for_each_entry_from(wbk, &vnode->wb_keys, vnode_link) { _debug("wbk %u", key_serial(wbk->key)); - ret2 = key_validate(wbk->key); - if (ret2 == 0) { + if (key_validate(wbk->key) == 0) { refcount_inc(&wbk->usage); + wreq->netfs_priv = key_get(wbk->key); + wreq->netfs_priv2 = wbk; _debug("USE WB KEY %u", key_serial(wbk->key)); break; } - - wbk = NULL; - if (ret == -ENOKEY) - ret = ret2; - p = p->next; } spin_unlock(&vnode->wb_lock); - if (*_wbk) - afs_put_wb_key(*_wbk); - *_wbk = wbk; - return 0; + + afs_put_wb_key(old); } static void afs_store_data_success(struct afs_operation *op) @@ -88,72 +84,91 @@ static const struct afs_operation_ops afs_store_data_operation = { }; /* - * write to a file + * Prepare a subrequest to write to the server. This sets the max_len + * parameter. */ -static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t pos) +void afs_prepare_write(struct netfs_io_subrequest *subreq) { + //if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) + // subreq->max_len = 512 * 1024; + //else + subreq->max_len = 256 * 1024 * 1024; +} + +/* + * Issue a subrequest to write to the server. + */ +static void afs_issue_write_worker(struct work_struct *work) +{ + struct netfs_io_subrequest *subreq = container_of(work, struct netfs_io_subrequest, work); + struct netfs_io_request *wreq = subreq->rreq; struct afs_operation *op; - struct afs_wb_key *wbk = NULL; - loff_t size = iov_iter_count(iter); + struct afs_vnode *vnode = AFS_FS_I(wreq->inode); + unsigned long long pos = subreq->start + subreq->transferred; + size_t len = subreq->len - subreq->transferred; int ret = -ENOKEY; - _enter("%s{%llx:%llu.%u},%llx,%llx", + _enter("R=%x[%x],%s{%llx:%llu.%u},%llx,%zx", + wreq->debug_id, subreq->debug_index, vnode->volume->name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, - size, pos); + pos, len); - ret = afs_get_writeback_key(vnode, &wbk); - if (ret) { - _leave(" = %d [no keys]", ret); - return ret; - } +#if 0 // Error injection + if (subreq->debug_index == 3) + return netfs_write_subrequest_terminated(subreq, -ENOANO, false); - op = afs_alloc_operation(wbk->key, vnode->volume); - if (IS_ERR(op)) { - afs_put_wb_key(wbk); - return -ENOMEM; + if (!test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) { + set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); + return netfs_write_subrequest_terminated(subreq, -EAGAIN, false); } +#endif + + op = afs_alloc_operation(wreq->netfs_priv, vnode->volume); + if (IS_ERR(op)) + return netfs_write_subrequest_terminated(subreq, -EAGAIN, false); afs_op_set_vnode(op, 0, vnode); - op->file[0].dv_delta = 1; + op->file[0].dv_delta = 1; op->file[0].modification = true; - op->store.pos = pos; - op->store.size = size; - op->flags |= AFS_OPERATION_UNINTR; - op->ops = &afs_store_data_operation; + op->store.pos = pos; + op->store.size = len; + op->flags |= AFS_OPERATION_UNINTR; + op->ops = &afs_store_data_operation; -try_next_key: afs_begin_vnode_operation(op); - op->store.write_iter = iter; - op->store.i_size = max(pos + size, vnode->netfs.remote_i_size); - op->mtime = inode_get_mtime(&vnode->netfs.inode); + op->store.write_iter = &subreq->io_iter; + op->store.i_size = umax(pos + len, vnode->netfs.remote_i_size); + op->mtime = inode_get_mtime(&vnode->netfs.inode); afs_wait_for_operation(op); - - switch (afs_op_error(op)) { + ret = afs_put_operation(op); + switch (ret) { case -EACCES: case -EPERM: case -ENOKEY: case -EKEYEXPIRED: case -EKEYREJECTED: case -EKEYREVOKED: - _debug("next"); - - ret = afs_get_writeback_key(vnode, &wbk); - if (ret == 0) { - key_put(op->key); - op->key = key_get(wbk->key); - goto try_next_key; - } + /* If there are more keys we can try, use the retry algorithm + * to rotate the keys. + */ + if (wreq->netfs_priv2) + set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); break; } - afs_put_wb_key(wbk); - _leave(" = %d", afs_op_error(op)); - return afs_put_operation(op); + netfs_write_subrequest_terminated(subreq, ret < 0 ? ret : subreq->len, false); +} + +void afs_issue_write(struct netfs_io_subrequest *subreq) +{ + subreq->work.func = afs_issue_write_worker; + if (!queue_work(system_unbound_wq, &subreq->work)) + WARN_ON_ONCE(1); } /* @@ -162,52 +177,32 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t */ void afs_begin_writeback(struct netfs_io_request *wreq) { + afs_get_writeback_key(wreq); wreq->io_streams[0].avail = true; } /* - * Prepare a subrequest to write to the server. This sets the max_len - * parameter. - */ -void afs_prepare_write(struct netfs_io_subrequest *subreq) -{ - //if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) - // subreq->max_len = 512 * 1024; - //else - subreq->max_len = 256 * 1024 * 1024; -} - -/* - * Issue a subrequest to write to the server. + * Prepare to retry the writes in request. Use this to try rotating the + * available writeback keys. */ -static void afs_issue_write_worker(struct work_struct *work) +void afs_retry_request(struct netfs_io_request *wreq, struct netfs_io_stream *stream) { - struct netfs_io_subrequest *subreq = container_of(work, struct netfs_io_subrequest, work); - struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode); - ssize_t ret; - - _enter("%x[%x],%zx", - subreq->rreq->debug_id, subreq->debug_index, subreq->io_iter.count); - -#if 0 // Error injection - if (subreq->debug_index == 3) - return netfs_write_subrequest_terminated(subreq, -ENOANO, false); + struct netfs_io_subrequest *subreq = + list_first_entry(&stream->subrequests, + struct netfs_io_subrequest, rreq_link); - if (!test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) { - set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); - return netfs_write_subrequest_terminated(subreq, -EAGAIN, false); + switch (subreq->error) { + case -EACCES: + case -EPERM: + case -ENOKEY: + case -EKEYEXPIRED: + case -EKEYREJECTED: + case -EKEYREVOKED: + afs_get_writeback_key(wreq); + if (!wreq->netfs_priv) + stream->failed = true; + break; } -#endif - - ret = afs_store_data(vnode, &subreq->io_iter, subreq->start); - netfs_write_subrequest_terminated(subreq, ret < 0 ? ret : subreq->len, false); -} - -void afs_issue_write(struct netfs_io_subrequest *subreq) -{ - subreq->work.func = afs_issue_write_worker; - if (!queue_work(system_unbound_wq, &subreq->work)) - WARN_ON_ONCE(1); } /* diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c index f14c08bf605d..60112e4b2c5e 100644 --- a/fs/netfs/write_collect.c +++ b/fs/netfs/write_collect.c @@ -163,6 +163,13 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq, _enter("R=%x[%x:]", wreq->debug_id, stream->stream_nr); + if (list_empty(&stream->subrequests)) + return; + + if (stream->source == NETFS_UPLOAD_TO_SERVER && + wreq->netfs_ops->retry_request) + wreq->netfs_ops->retry_request(wreq, stream); + if (unlikely(stream->failed)) return; @@ -182,8 +189,6 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq, return; } - if (list_empty(&stream->subrequests)) - return; next = stream->subrequests.next; do { diff --git a/include/linux/netfs.h b/include/linux/netfs.h index c2ba364041b0..298552f5122c 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -235,6 +235,7 @@ struct netfs_io_request { struct iov_iter iter; /* Unencrypted-side iterator */ struct iov_iter io_iter; /* I/O (Encrypted-side) iterator */ void *netfs_priv; /* Private data for the netfs */ + void *netfs_priv2; /* Private data for the netfs */ struct bio_vec *direct_bv; /* DIO buffer list (when handling iovec-iter) */ unsigned int direct_bv_count; /* Number of elements in direct_bv[] */ unsigned int debug_id; @@ -306,6 +307,7 @@ struct netfs_request_ops { void (*begin_writeback)(struct netfs_io_request *wreq); void (*prepare_write)(struct netfs_io_subrequest *subreq); void (*issue_write)(struct netfs_io_subrequest *subreq); + void (*retry_request)(struct netfs_io_request *wreq, struct netfs_io_stream *stream); void (*invalidate_cache)(struct netfs_io_request *wreq); };