From patchwork Wed Aug 24 09:35:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Wysochanski X-Patchwork-Id: 12953100 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A2FEC32796 for ; Wed, 24 Aug 2022 09:35:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235866AbiHXJfO (ORCPT ); Wed, 24 Aug 2022 05:35:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235831AbiHXJfN (ORCPT ); Wed, 24 Aug 2022 05:35:13 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02A30E9D for ; Wed, 24 Aug 2022 02:35:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1661333710; 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=hNJz8XOVI/usm/LNKTiEUQvFydCHvPTWvTLMPlpNqsc=; b=h4pC8W86I54VM1xmcLcBJTdW/jBVvs57/LeKENgKtA6YaCRwY38tMDdnDAE4Q1mk6EcQ5A Mc9u+7HP6kdW36DMm7ebOi8xkOFGp2A9GvvK50KaJ+mPKWLORtFc+X1cq6YzSneIQb8ab4 XoGnOVYFwwtgA989gWxEB4VE2ztgHQs= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-387-Kz-ZbY8JOsKiwrzSbARBtA-1; Wed, 24 Aug 2022 05:35:05 -0400 X-MC-Unique: Kz-ZbY8JOsKiwrzSbARBtA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 957818037AA; Wed, 24 Aug 2022 09:35:04 +0000 (UTC) Received: from dwysocha.rdu.csb (unknown [10.22.8.98]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 51C2214152E0; Wed, 24 Aug 2022 09:35:04 +0000 (UTC) From: Dave Wysochanski To: Anna Schumaker , Trond Myklebust , David Howells Cc: linux-nfs@vger.kernel.org, linux-cachefs@redhat.com, Benjamin Maynard , Daire Byrne Subject: [RFC PATCH 3/3] NFS: Convert nfs_read_folio and nfs_readahead to netfs APIs Date: Wed, 24 Aug 2022 05:35:01 -0400 Message-Id: <20220824093501.384755-4-dwysocha@redhat.com> In-Reply-To: <20220824093501.384755-1-dwysocha@redhat.com> References: <20220824093501.384755-1-dwysocha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Convert the NFS non-direct read code paths to corresponding netfs APIs. The netfs API defines struct netfs_request_ops which must be filled in by the network filesystem. For NFS, we only need to define 4 of the functions, the main one being the issue_read() function. The issue_read() function is called by the netfs layer when a read cannot be fulfilled locally, and must be sent to the server (either the cache is not active, or it is active but the data is not available). Once the read from the server is complete, netfs requires a call to netfs_subreq_terminated() which conveys either how many bytes were read successfully, or an error. Note that issue_read() is called with a structure, netfs_io_subrequest, which defines the IO requested, and contains a start and a length (both in bytes), and assumes the underlying netfs will return a either an error on the whole region, or the number of bytes successfully read (a short read). The NFS pgio API layer is page based, and there is no way for the caller of these APIs to know how many RPCs will be sent and how the pages will be broken up into underlying RPCs, each of which will have their own return code. Thus, NFS needs some way to accommodate the netfs API requirement on the single response to the whole request, while also minimizing disruptive changes to the NFS pgio layer. The approach taken with this patch is to allocate a small structure for each call to nfs_issue_read() to keep some accounting information for the outstanding RPCs, as well as the final error value or the number of bytes successfully read. The accounting data is updated inside the pgio layer, when a nfs_pgio_header contains a valid pointer to this data. In the NFS read completion routine, nfs_read_completion(), the final error value and bytes read is updated, and the accounting data is used to determine whether this completion represents the last RPC. If this is the last RPC, call netfs_subreq_terminated() with the final error value or the number of bytes transferred. Note that the final disposition of a netfs_io_subrequest is given by transferred_or_error parameter to netfs_subreq_terminated(), which conveys either the number of bytes transferred (all RPCs were successful), or an error (one or more RPCs completed with an error). In the error case, the value of transferred_or_error is set to the error in the RPC that completed last. Signed-off-by: Dave Wysochanski --- fs/nfs/fscache.c | 175 ++++++++++++++++++--------------------- fs/nfs/fscache.h | 68 ++++++++------- fs/nfs/inode.c | 2 + fs/nfs/internal.h | 8 ++ fs/nfs/pagelist.c | 14 ++++ fs/nfs/read.c | 99 +++++++--------------- include/linux/nfs_page.h | 1 + include/linux/nfs_xdr.h | 1 + 8 files changed, 172 insertions(+), 196 deletions(-) diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c index a6fc1c8b6644..8e1f5c2ed8f2 100644 --- a/fs/nfs/fscache.c +++ b/fs/nfs/fscache.c @@ -15,6 +15,9 @@ #include #include #include +#include +#include +#include #include "internal.h" #include "iostat.h" @@ -235,112 +238,96 @@ void nfs_fscache_release_file(struct inode *inode, struct file *filp) fscache_unuse_cookie(cookie, &auxdata, &i_size); } -/* - * Fallback page reading interface. - */ -static int fscache_fallback_read_page(struct inode *inode, struct page *page) + +atomic_t nfs_netfs_debug_id; +static int nfs_netfs_init_request(struct netfs_io_request *rreq, struct file *file) { - struct netfs_cache_resources cres; - struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs); - struct iov_iter iter; - struct bio_vec bvec[1]; - int ret; - - memset(&cres, 0, sizeof(cres)); - bvec[0].bv_page = page; - bvec[0].bv_offset = 0; - bvec[0].bv_len = PAGE_SIZE; - iov_iter_bvec(&iter, READ, bvec, ARRAY_SIZE(bvec), PAGE_SIZE); - - ret = fscache_begin_read_operation(&cres, cookie); - if (ret < 0) - return ret; - - ret = fscache_read(&cres, page_offset(page), &iter, NETFS_READ_HOLE_FAIL, - NULL, NULL); - fscache_end_operation(&cres); - return ret; + struct nfs_open_context *ctx; + + if (file == NULL) { + ctx = nfs_find_open_context(rreq->inode, NULL, FMODE_READ); + if (!ctx) + return -ENOMEM; + } else + ctx = get_nfs_open_context(nfs_file_open_context(file)); + + rreq->netfs_priv = ctx; + + if (netfs_i_cookie(&NFS_I(rreq->inode)->netfs)) + rreq->debug_id = atomic_inc_return(&nfs_netfs_debug_id); + + return 0; } -/* - * Fallback page writing interface. - */ -static int fscache_fallback_write_page(struct inode *inode, struct page *page, - bool no_space_allocated_yet) +static void nfs_netfs_free_request(struct netfs_io_request *rreq) { - struct netfs_cache_resources cres; - struct fscache_cookie *cookie = netfs_i_cookie(&NFS_I(inode)->netfs); - struct iov_iter iter; - struct bio_vec bvec[1]; - loff_t start = page_offset(page); - size_t len = PAGE_SIZE; - int ret; - - memset(&cres, 0, sizeof(cres)); - bvec[0].bv_page = page; - bvec[0].bv_offset = 0; - bvec[0].bv_len = PAGE_SIZE; - iov_iter_bvec(&iter, WRITE, bvec, ARRAY_SIZE(bvec), PAGE_SIZE); - - ret = fscache_begin_write_operation(&cres, cookie); - if (ret < 0) - return ret; - - ret = cres.ops->prepare_write(&cres, &start, &len, i_size_read(inode), - no_space_allocated_yet); - if (ret == 0) - ret = fscache_write(&cres, page_offset(page), &iter, NULL, NULL); - fscache_end_operation(&cres); - return ret; + put_nfs_open_context(rreq->netfs_priv); } -/* - * Retrieve a page from fscache - */ -int __nfs_fscache_read_page(struct inode *inode, struct page *page) +static inline int nfs_begin_cache_operation(struct netfs_io_request *rreq) { - int ret; - - trace_nfs_fscache_read_page(inode, page); - if (PageChecked(page)) { - ClearPageChecked(page); - ret = 1; - goto out; - } - - ret = fscache_fallback_read_page(inode, page); - if (ret < 0) { - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL); - SetPageChecked(page); - goto out; - } - - /* Read completed synchronously */ - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK); - SetPageUptodate(page); - ret = 0; -out: - trace_nfs_fscache_read_page_exit(inode, page, ret); - return ret; + return fscache_begin_read_operation(&rreq->cache_resources, + netfs_i_cookie(&NFS_I(rreq->inode)->netfs)); } -/* - * Store a newly fetched page in fscache. We can be certain there's no page - * stored in the cache as yet otherwise we would've read it from there. - */ -void __nfs_fscache_write_page(struct inode *inode, struct page *page) +static struct nfs_netfs_io_data *nfs_netfs_alloc(struct netfs_io_subrequest *sreq) { - int ret; + struct nfs_netfs_io_data *netfs; + + netfs = kzalloc(sizeof(*netfs), GFP_KERNEL_ACCOUNT); + if (!netfs) + return NULL; + netfs->sreq = sreq; + refcount_set(&netfs->refcount, 1); + return netfs; +} - trace_nfs_fscache_write_page(inode, page); +static bool nfs_netfs_clamp_length(struct netfs_io_subrequest *sreq) +{ + size_t rsize = NFS_SB(sreq->rreq->inode->i_sb)->rsize; - ret = fscache_fallback_write_page(inode, page, true); + sreq->len = min(sreq->len, rsize); + return true; +} - if (ret != 0) { - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL); - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED); - } else { - nfs_inc_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_WRITTEN_OK); +static void nfs_issue_read(struct netfs_io_subrequest *sreq) +{ + struct nfs_pageio_descriptor pgio; + struct inode *inode = sreq->rreq->inode; + struct nfs_open_context *ctx = sreq->rreq->netfs_priv; + struct page *page; + int err; + pgoff_t start = (sreq->start + sreq->transferred) >> PAGE_SHIFT; + pgoff_t last = ((sreq->start + sreq->len - + sreq->transferred - 1) >> PAGE_SHIFT); + XA_STATE(xas, &sreq->rreq->mapping->i_pages, start); + + nfs_pageio_init_read(&pgio, inode, false, + &nfs_async_read_completion_ops); + + pgio.pg_netfs = nfs_netfs_alloc(sreq); /* used in completion */ + if (!pgio.pg_netfs) + return netfs_subreq_terminated(sreq, -ENOMEM, false); + + xas_lock(&xas); + xas_for_each(&xas, page, last) { + /* nfs_pageio_add_page() may schedule() due to pNFS layout and other RPCs */ + xas_pause(&xas); + xas_unlock(&xas); + err = nfs_pageio_add_page(&pgio, ctx, page); + if (err < 0) + return netfs_subreq_terminated(sreq, err, false); + xas_lock(&xas); } - trace_nfs_fscache_write_page_exit(inode, page, ret); + xas_unlock(&xas); + nfs_pageio_complete_read(&pgio); + nfs_netfs_put(pgio.pg_netfs); } + +const struct netfs_request_ops nfs_netfs_ops = { + .init_request = nfs_netfs_init_request, + .free_request = nfs_netfs_free_request, + .begin_cache_operation = nfs_begin_cache_operation, + .issue_read = nfs_issue_read, + .clamp_length = nfs_netfs_clamp_length +}; diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h index 38614ed8f951..90a20ce9c432 100644 --- a/fs/nfs/fscache.h +++ b/fs/nfs/fscache.h @@ -34,6 +34,41 @@ struct nfs_fscache_inode_auxdata { u64 change_attr; }; +struct nfs_netfs_io_data { + refcount_t refcount; + struct netfs_io_subrequest *sreq; + + /* + * NFS may split a netfs_io_subrequest into multiple RPCs, each + * with their own read completion. In netfs, we can only call + * netfs_subreq_terminated() once for each subrequest. So we + * must keep track of the rpcs and rpc_byte_count for what has + * been submitted, and only call netfs via netfs_subreq_terminated() + * when the final RPC has completed. + */ + atomic_t rpcs; + unsigned long rpc_byte_count; + + /* + * Final dispostion of the netfs_io_subrequest, sent in + * netfs_subreq_terminated() + */ + ssize_t transferred; + int error; +}; + +static inline void nfs_netfs_get(struct nfs_netfs_io_data *netfs) +{ + refcount_inc(&netfs->refcount); +} + +static inline void nfs_netfs_put(struct nfs_netfs_io_data *netfs) +{ + if (!refcount_dec_and_test(&netfs->refcount)) + return; + kfree(netfs); +} + /* * fscache.c */ @@ -45,43 +80,17 @@ extern void nfs_fscache_clear_inode(struct inode *); extern void nfs_fscache_open_file(struct inode *, struct file *); extern void nfs_fscache_release_file(struct inode *, struct file *); -extern int __nfs_fscache_read_page(struct inode *, struct page *); -extern void __nfs_fscache_write_page(struct inode *, struct page *); - static inline bool nfs_fscache_release_folio(struct folio *folio, gfp_t gfp) { if (folio_test_fscache(folio)) { if (current_is_kswapd() || !(gfp & __GFP_FS)) return false; folio_wait_fscache(folio); - fscache_note_page_release(netfs_i_cookie(&NFS_I(folio->mapping->host)->netfs)); - nfs_inc_fscache_stats(folio->mapping->host, - NFSIOS_FSCACHE_PAGES_UNCACHED); } + fscache_note_page_release(netfs_i_cookie(&NFS_I(folio->mapping->host)->netfs)); return true; } -/* - * Retrieve a page from an inode data storage object. - */ -static inline int nfs_fscache_read_page(struct inode *inode, struct page *page) -{ - if (netfs_inode(inode)->cache) - return __nfs_fscache_read_page(inode, page); - return -ENOBUFS; -} - -/* - * Store a page newly fetched from the server in an inode data storage object - * in the cache. - */ -static inline void nfs_fscache_write_page(struct inode *inode, - struct page *page) -{ - if (netfs_inode(inode)->cache) - __nfs_fscache_write_page(inode, page); -} - static inline void nfs_fscache_update_auxdata(struct nfs_fscache_inode_auxdata *auxdata, struct inode *inode) { @@ -130,11 +139,6 @@ static inline bool nfs_fscache_release_folio(struct folio *folio, gfp_t gfp) { return true; /* may release folio */ } -static inline int nfs_fscache_read_page(struct inode *inode, struct page *page) -{ - return -ENOBUFS; -} -static inline void nfs_fscache_write_page(struct inode *inode, struct page *page) {} static inline void nfs_fscache_invalidate(struct inode *inode, int flags) {} static inline const char *nfs_server_fscache_state(struct nfs_server *server) diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 3acddec41ba7..dea13500003f 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -2248,6 +2248,8 @@ struct inode *nfs_alloc_inode(struct super_block *sb) #ifdef CONFIG_NFS_V4_2 nfsi->xattr_cache = NULL; #endif + netfs_inode_init(&nfsi->netfs, &nfs_netfs_ops); + return &nfsi->netfs.inode; } EXPORT_SYMBOL_GPL(nfs_alloc_inode); diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 29cfee4660c5..2895e9ada22e 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -453,6 +453,9 @@ extern void nfs_sb_deactive(struct super_block *sb); extern int nfs_client_for_each_server(struct nfs_client *clp, int (*fn)(struct nfs_server *, void *), void *data); +/* fscache.c */ +extern const struct netfs_request_ops nfs_netfs_ops; + /* io.c */ extern void nfs_start_io_read(struct inode *inode); extern void nfs_end_io_read(struct inode *inode); @@ -482,9 +485,14 @@ extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool struct nfs_pgio_completion_ops; /* read.c */ +extern const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode, bool force_mds, const struct nfs_pgio_completion_ops *compl_ops); +extern int nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, + struct nfs_open_context *ctx, + struct page *page); +extern void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio); extern void nfs_read_prepare(struct rpc_task *task, void *calldata); extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index 317cedfa52bf..93458da76e32 100644 --- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -25,6 +25,7 @@ #include "internal.h" #include "pnfs.h" #include "nfstrace.h" +#include "fscache.h" #define NFSDBG_FACILITY NFSDBG_PAGECACHE @@ -68,6 +69,10 @@ void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, hdr->good_bytes = mirror->pg_count; hdr->io_completion = desc->pg_io_completion; hdr->dreq = desc->pg_dreq; + if (desc->pg_netfs) { + hdr->netfs = desc->pg_netfs; + nfs_netfs_get(desc->pg_netfs); + } hdr->release = release; hdr->completion_ops = desc->pg_completion_ops; if (hdr->completion_ops->init_hdr) @@ -846,6 +851,7 @@ void nfs_pageio_init(struct nfs_pageio_descriptor *desc, desc->pg_lseg = NULL; desc->pg_io_completion = NULL; desc->pg_dreq = NULL; + desc->pg_netfs = NULL; desc->pg_bsize = bsize; desc->pg_mirror_count = 1; @@ -896,6 +902,7 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, struct nfs_page_array *pg_array = &hdr->page_array; unsigned int pagecount, pageused; gfp_t gfp_flags = nfs_io_gfp_mask(); + struct nfs_netfs_io_data *netfs = hdr->netfs; pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count); pg_array->npages = pagecount; @@ -940,6 +947,12 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, /* Set up the argument struct */ nfs_pgio_rpcsetup(hdr, mirror->pg_count, desc->pg_ioflags, &cinfo); desc->pg_rpc_callops = &nfs_pgio_common_ops; + + /* Record netfs RPC count */ + if (netfs) { + atomic_inc(&netfs->rpcs); + netfs->rpc_byte_count += hdr->args.count; + } return 0; } EXPORT_SYMBOL_GPL(nfs_generic_pgio); @@ -1360,6 +1373,7 @@ int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, desc->pg_io_completion = hdr->io_completion; desc->pg_dreq = hdr->dreq; + desc->pg_netfs = hdr->netfs; list_splice_init(&hdr->pages, &pages); while (!list_empty(&pages)) { struct nfs_page *req = nfs_list_entry(pages.next); diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 525e82ea9a9e..f7dcb72530ee 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -30,7 +30,7 @@ #define NFSDBG_FACILITY NFSDBG_PAGECACHE -static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; +const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; static const struct nfs_rw_ops nfs_rw_read_ops; static struct kmem_cache *nfs_rdata_cachep; @@ -74,7 +74,7 @@ void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, } EXPORT_SYMBOL_GPL(nfs_pageio_init_read); -static void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio) +void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio) { struct nfs_pgio_mirror *pgm; unsigned long npages; @@ -119,11 +119,7 @@ static void nfs_readpage_release(struct nfs_page *req, int error) if (nfs_error_is_fatal_on_server(error) && error != -ETIMEDOUT) SetPageError(page); - if (nfs_page_group_sync_on_bit(req, PG_UNLOCKPAGE)) { - if (PageUptodate(page)) - nfs_fscache_write_page(inode, page); - unlock_page(page); - } + nfs_release_request(req); } @@ -137,6 +133,8 @@ static void nfs_read_completion(struct nfs_pgio_header *hdr) { unsigned long bytes = 0; int error; + struct nfs_netfs_io_data *netfs = hdr->netfs; + struct netfs_io_subrequest *sreq = netfs->sreq; if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) goto out; @@ -177,6 +175,24 @@ static void nfs_read_completion(struct nfs_pgio_header *hdr) nfs_list_remove_request(req); nfs_readpage_release(req, error); } + if (netfs) { + if (test_bit(NFS_IOHDR_EOF, &hdr->flags)) + __set_bit(NETFS_SREQ_CLEAR_TAIL, &sreq->flags); + + /* FIXME: What if multiple RPCs race, need locking (spinlock?) or is this ok? */ + if (hdr->error) + netfs->error = hdr->error; + else + netfs->transferred += hdr->res.count; + + /* Only the last RPC completion should call netfs_subreq_terminated() */ + if (atomic_dec_and_test(&netfs->rpcs) && + (netfs->rpc_byte_count >= sreq->len)) { /* Could have EOF */ + netfs_subreq_terminated(sreq, netfs->error ?: netfs->transferred, false); + nfs_netfs_put(netfs); + hdr->netfs = NULL; + } + } out: hdr->release(hdr); } @@ -202,7 +218,7 @@ nfs_async_read_error(struct list_head *head, int error) } } -static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = { +const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = { .error_cleanup = nfs_async_read_error, .completion = nfs_read_completion, }; @@ -294,12 +310,6 @@ nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, aligned_len = min_t(unsigned int, ALIGN(len, rsize), PAGE_SIZE); - if (!IS_SYNC(page->mapping->host)) { - error = nfs_fscache_read_page(page->mapping->host, page); - if (error == 0) - goto out_unlock; - } - new = nfs_create_request(ctx, page, 0, aligned_len); if (IS_ERR(new)) goto out_error; @@ -315,8 +325,6 @@ nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, return 0; out_error: error = PTR_ERR(new); -out_unlock: - unlock_page(page); out: return error; } @@ -330,8 +338,6 @@ nfs_pageio_add_page(struct nfs_pageio_descriptor *pgio, int nfs_read_folio(struct file *file, struct folio *folio) { struct page *page = &folio->page; - struct nfs_pageio_descriptor pgio; - struct nfs_open_context *ctx; struct inode *inode = page_file_mapping(page)->host; int ret; @@ -355,47 +361,19 @@ int nfs_read_folio(struct file *file, struct folio *folio) if (NFS_STALE(inode)) goto out_unlock; - if (file == NULL) { - ret = -EBADF; - ctx = nfs_find_open_context(inode, NULL, FMODE_READ); - if (ctx == NULL) - goto out_unlock; - } else - ctx = get_nfs_open_context(nfs_file_open_context(file)); - - xchg(&ctx->error, 0); - nfs_pageio_init_read(&pgio, inode, false, - &nfs_async_read_completion_ops); - - ret = nfs_pageio_add_page(&pgio, ctx, page); - if (ret) - goto out; - - nfs_pageio_complete_read(&pgio); - ret = pgio.pg_error < 0 ? pgio.pg_error : 0; - if (!ret) { - ret = wait_on_page_locked_killable(page); - if (!PageUptodate(page) && !ret) - ret = xchg(&ctx->error, 0); - } -out: - put_nfs_open_context(ctx); - trace_nfs_aop_readpage_done(inode, page, ret); - return ret; + ret = netfs_read_folio(file, folio); + goto out; out_unlock: unlock_page(page); +out: trace_nfs_aop_readpage_done(inode, page, ret); return ret; } void nfs_readahead(struct readahead_control *ractl) { - struct nfs_pageio_descriptor pgio; - struct nfs_open_context *ctx; unsigned int nr_pages = readahead_count(ractl); - struct file *file = ractl->file; struct inode *inode = ractl->mapping->host; - struct page *page; int ret; trace_nfs_aop_readahead(inode, readahead_pos(ractl), nr_pages); @@ -405,27 +383,8 @@ void nfs_readahead(struct readahead_control *ractl) if (NFS_STALE(inode)) goto out; - if (file == NULL) { - ret = -EBADF; - ctx = nfs_find_open_context(inode, NULL, FMODE_READ); - if (ctx == NULL) - goto out; - } else - ctx = get_nfs_open_context(nfs_file_open_context(file)); - - nfs_pageio_init_read(&pgio, inode, false, - &nfs_async_read_completion_ops); - - while ((page = readahead_page(ractl)) != NULL) { - ret = nfs_pageio_add_page(&pgio, ctx, page); - put_page(page); - if (ret) - break; - } - - nfs_pageio_complete_read(&pgio); - - put_nfs_open_context(ctx); + ret = 0; + netfs_readahead(ractl); out: trace_nfs_aop_readahead_done(inode, nr_pages, ret); } diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h index ba7e2e4b0926..f942ed3f7215 100644 --- a/include/linux/nfs_page.h +++ b/include/linux/nfs_page.h @@ -101,6 +101,7 @@ struct nfs_pageio_descriptor { struct pnfs_layout_segment *pg_lseg; struct nfs_io_completion *pg_io_completion; struct nfs_direct_req *pg_dreq; + void *pg_netfs; unsigned int pg_bsize; /* default bsize for mirrors */ u32 pg_mirror_count; diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index e86cf6642d21..770c3348b696 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -1619,6 +1619,7 @@ struct nfs_pgio_header { const struct nfs_rw_ops *rw_ops; struct nfs_io_completion *io_completion; struct nfs_direct_req *dreq; + void *netfs; int pnfs_error; int error; /* merge with pnfs_error */