From patchwork Thu Dec 21 13:23:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13502062 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 B1F5080039 for ; Thu, 21 Dec 2023 13:25:21 +0000 (UTC) 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="WKVutkry" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1703165120; 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=jvSBfprvkBoOjRik5NifHMGz4KyKCYFH+Iug548VZSw=; b=WKVutkryPuGaxvnCFOYdXzjepZ4bioSbVOCGj4Pj/b0d8gxl3gaHDihY9/2+/2KoTGnRNx YY3+slO677h+ES5VEwvCdLfjP1AtKdTPIpQ+56E18LtEFRyj7zK9vQS6+o3QY4kw2R06Ro cAYNZ015onvfcBEz2JR/O/ubPp0nMYc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-665-hS8gF3qnMu2hxWxxQPtvpQ-1; Thu, 21 Dec 2023 08:25:19 -0500 X-MC-Unique: hS8gF3qnMu2hxWxxQPtvpQ-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 00316101A551; Thu, 21 Dec 2023 13:25:18 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.39.195.169]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1A9FD2166B31; Thu, 21 Dec 2023 13:25:14 +0000 (UTC) From: David Howells To: Jeff Layton , Steve French Cc: David Howells , Matthew Wilcox , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Dominique Martinet , Eric Van Hensbergen , Ilya Dryomov , Christian Brauner , 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-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 19/40] netfs: Extend the netfs_io_*request structs to handle writes Date: Thu, 21 Dec 2023 13:23:14 +0000 Message-ID: <20231221132400.1601991-20-dhowells@redhat.com> In-Reply-To: <20231221132400.1601991-1-dhowells@redhat.com> References: <20231221132400.1601991-1-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 Modify the netfs_io_request struct to act as a point around which writes can be coordinated. It represents and pins a range of pages that need writing and a list of regions of dirty data in that range of pages. If RMW is required, the original data can be downloaded into the bounce buffer, decrypted if necessary, the modifications made, then the modified data can be reencrypted/recompressed and sent back to the server. Signed-off-by: David Howells Reviewed-by: Jeff Layton cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- fs/netfs/internal.h | 6 ++++++ fs/netfs/main.c | 3 ++- fs/netfs/objects.c | 6 ++++++ fs/netfs/stats.c | 16 +++++++++++++--- include/linux/netfs.h | 15 ++++++++++++++- include/trace/events/netfs.h | 8 ++++++-- 6 files changed, 47 insertions(+), 7 deletions(-) diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index b908c7e0a901..2bf2e82b2ad7 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -110,6 +110,12 @@ extern atomic_t netfs_n_rh_write_begin; extern atomic_t netfs_n_rh_write_done; extern atomic_t netfs_n_rh_write_failed; extern atomic_t netfs_n_rh_write_zskip; +extern atomic_t netfs_n_wh_upload; +extern atomic_t netfs_n_wh_upload_done; +extern atomic_t netfs_n_wh_upload_failed; +extern atomic_t netfs_n_wh_write; +extern atomic_t netfs_n_wh_write_done; +extern atomic_t netfs_n_wh_write_failed; int netfs_stats_show(struct seq_file *m, void *v); diff --git a/fs/netfs/main.c b/fs/netfs/main.c index 97ce1436615b..ab6cac110676 100644 --- a/fs/netfs/main.c +++ b/fs/netfs/main.c @@ -25,10 +25,11 @@ MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask"); LIST_HEAD(netfs_io_requests); DEFINE_SPINLOCK(netfs_proc_lock); -static const char *netfs_origins[] = { +static const char *netfs_origins[nr__netfs_io_origin] = { [NETFS_READAHEAD] = "RA", [NETFS_READPAGE] = "RP", [NETFS_READ_FOR_WRITE] = "RW", + [NETFS_WRITEBACK] = "WB", }; /* diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c index 4df5e5eeada6..65a17dd4ab49 100644 --- a/fs/netfs/objects.c +++ b/fs/netfs/objects.c @@ -20,6 +20,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, struct inode *inode = file ? file_inode(file) : mapping->host; struct netfs_inode *ctx = netfs_inode(inode); struct netfs_io_request *rreq; + bool cached = netfs_is_cache_enabled(ctx); int ret; rreq = kzalloc(ctx->ops->io_request_size ?: sizeof(struct netfs_io_request), @@ -37,7 +38,10 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, rreq->debug_id = atomic_inc_return(&debug_ids); INIT_LIST_HEAD(&rreq->subrequests); refcount_set(&rreq->ref, 1); + __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags); + if (cached) + __set_bit(NETFS_RREQ_WRITE_TO_CACHE, &rreq->flags); if (rreq->netfs_ops->init_request) { ret = rreq->netfs_ops->init_request(rreq, file); if (ret < 0) { @@ -46,6 +50,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, } } + trace_netfs_rreq_ref(rreq->debug_id, 1, netfs_rreq_trace_new); netfs_proc_add_rreq(rreq); netfs_stat(&netfs_n_rh_rreq); return rreq; @@ -129,6 +134,7 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq sizeof(struct netfs_io_subrequest), GFP_KERNEL); if (subreq) { + INIT_WORK(&subreq->work, NULL); INIT_LIST_HEAD(&subreq->rreq_link); refcount_set(&subreq->ref, 2); subreq->rreq = rreq; diff --git a/fs/netfs/stats.c b/fs/netfs/stats.c index 6025dc485f7e..c1f85cd595a4 100644 --- a/fs/netfs/stats.c +++ b/fs/netfs/stats.c @@ -27,6 +27,12 @@ atomic_t netfs_n_rh_write_begin; atomic_t netfs_n_rh_write_done; atomic_t netfs_n_rh_write_failed; atomic_t netfs_n_rh_write_zskip; +atomic_t netfs_n_wh_upload; +atomic_t netfs_n_wh_upload_done; +atomic_t netfs_n_wh_upload_failed; +atomic_t netfs_n_wh_write; +atomic_t netfs_n_wh_write_done; +atomic_t netfs_n_wh_write_failed; int netfs_stats_show(struct seq_file *m, void *v) { @@ -50,10 +56,14 @@ int netfs_stats_show(struct seq_file *m, void *v) atomic_read(&netfs_n_rh_read), atomic_read(&netfs_n_rh_read_done), atomic_read(&netfs_n_rh_read_failed)); + seq_printf(m, "Netfs : UL=%u us=%u uf=%u\n", + atomic_read(&netfs_n_wh_upload), + atomic_read(&netfs_n_wh_upload_done), + atomic_read(&netfs_n_wh_upload_failed)); seq_printf(m, "Netfs : WR=%u ws=%u wf=%u\n", - atomic_read(&netfs_n_rh_write), - atomic_read(&netfs_n_rh_write_done), - atomic_read(&netfs_n_rh_write_failed)); + atomic_read(&netfs_n_wh_write), + atomic_read(&netfs_n_wh_write_done), + atomic_read(&netfs_n_wh_write_failed)); return fscache_stats_show(m); } EXPORT_SYMBOL(netfs_stats_show); diff --git a/include/linux/netfs.h b/include/linux/netfs.h index 2ece21fccb02..d08bd37bc3ce 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -118,6 +118,9 @@ enum netfs_io_source { NETFS_DOWNLOAD_FROM_SERVER, NETFS_READ_FROM_CACHE, NETFS_INVALID_READ, + NETFS_UPLOAD_TO_SERVER, + NETFS_WRITE_TO_CACHE, + NETFS_INVALID_WRITE, } __mode(byte); typedef void (*netfs_io_terminated_t)(void *priv, ssize_t transferred_or_error, @@ -149,9 +152,14 @@ struct netfs_cache_resources { }; /* - * Descriptor for a single component subrequest. + * Descriptor for a single component subrequest. Each operation represents an + * individual read/write from/to a server, a cache, a journal, etc.. + * + * The buffer iterator is persistent for the life of the subrequest struct and + * the pages it points to can be relied on to exist for the duration. */ struct netfs_io_subrequest { + struct work_struct work; struct netfs_io_request *rreq; /* Supervising I/O request */ struct list_head rreq_link; /* Link in rreq->subrequests */ struct iov_iter io_iter; /* Iterator for this subrequest */ @@ -176,6 +184,8 @@ enum netfs_io_origin { NETFS_READAHEAD, /* This read was triggered by readahead */ NETFS_READPAGE, /* This read is a synchronous read */ NETFS_READ_FOR_WRITE, /* This read is to prepare a write */ + NETFS_WRITEBACK, /* This write was triggered by writepages */ + nr__netfs_io_origin } __mode(byte); /* @@ -199,6 +209,7 @@ struct netfs_io_request { __counted_by(direct_bv_count); unsigned int direct_bv_count; /* Number of elements in direct_bv[] */ unsigned int debug_id; + unsigned int subreq_counter; /* Next subreq->debug_index */ atomic_t nr_outstanding; /* Number of ops in progress */ atomic_t nr_copy_ops; /* Number of copy-to-cache ops in progress */ size_t submitted; /* Amount submitted for I/O so far */ @@ -217,6 +228,8 @@ struct netfs_io_request { #define NETFS_RREQ_DONT_UNLOCK_FOLIOS 3 /* Don't unlock the folios on completion */ #define NETFS_RREQ_FAILED 4 /* The request failed */ #define NETFS_RREQ_IN_PROGRESS 5 /* Unlocked when the request completes */ +#define NETFS_RREQ_WRITE_TO_CACHE 7 /* Need to write to the cache */ +#define NETFS_RREQ_UPLOAD_TO_SERVER 8 /* Need to write to the server */ const struct netfs_request_ops *netfs_ops; }; diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h index fce6d0bc78e5..4ea4e34d279f 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -24,7 +24,8 @@ #define netfs_rreq_origins \ EM(NETFS_READAHEAD, "RA") \ EM(NETFS_READPAGE, "RP") \ - E_(NETFS_READ_FOR_WRITE, "RW") + EM(NETFS_READ_FOR_WRITE, "RW") \ + E_(NETFS_WRITEBACK, "WB") #define netfs_rreq_traces \ EM(netfs_rreq_trace_assess, "ASSESS ") \ @@ -39,7 +40,10 @@ EM(NETFS_FILL_WITH_ZEROES, "ZERO") \ EM(NETFS_DOWNLOAD_FROM_SERVER, "DOWN") \ EM(NETFS_READ_FROM_CACHE, "READ") \ - E_(NETFS_INVALID_READ, "INVL") \ + EM(NETFS_INVALID_READ, "INVL") \ + EM(NETFS_UPLOAD_TO_SERVER, "UPLD") \ + EM(NETFS_WRITE_TO_CACHE, "WRIT") \ + E_(NETFS_INVALID_WRITE, "INVL") #define netfs_sreq_traces \ EM(netfs_sreq_trace_download_instead, "RDOWN") \