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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 32/32] NFS: Convert readpage to readahead and use netfs_readahead for fscache From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet Cc: Dave Wysochanski , dhowells@redhat.com, Jeff Layton , David Wysochanski , Matthew Wilcox , Alexander Viro , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 25 Jan 2021 21:37:29 +0000 Message-ID: <161161064956.2537118.3354798147866150631.stgit@warthog.procyon.org.uk> In-Reply-To: <161161025063.2537118.2009249444682241405.stgit@warthog.procyon.org.uk> References: <161161025063.2537118.2009249444682241405.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Dave Wysochanski The new FS-Cache API does not have a readpages equivalent function, and instead of fscache_read_or_alloc_pages() it implements a readahead function, netfs_readahead(). Call netfs_readahead() if fscache is enabled, and if not, utilize readahead_page() to run through the pages needed calling readpage_async_filler(). Signed-off-by: Dave Wysochanski --- fs/nfs/file.c | 2 +- fs/nfs/fscache.c | 49 +++++++------------------------------------- fs/nfs/fscache.h | 28 +++++++++---------------- fs/nfs/read.c | 32 ++++++++++++++--------------- include/linux/nfs_fs.h | 3 +-- include/linux/nfs_iostat.h | 2 +- 6 files changed, 37 insertions(+), 79 deletions(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 63940a7a70be..ebcaa164db5f 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -515,7 +515,7 @@ static void nfs_swap_deactivate(struct file *file) const struct address_space_operations nfs_file_aops = { .readpage = nfs_readpage, - .readpages = nfs_readpages, + .readahead = nfs_readahead, .set_page_dirty = __set_page_dirty_nobuffers, .writepage = nfs_writepage, .writepages = nfs_writepages, diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c index d3445bb1cc9c..b432bf931470 100644 --- a/fs/nfs/fscache.c +++ b/fs/nfs/fscache.c @@ -499,51 +499,18 @@ int __nfs_readpage_from_fscache(struct file *filp, /* * Retrieve a set of pages from fscache */ -int __nfs_readpages_from_fscache(struct nfs_open_context *ctx, - struct inode *inode, - struct address_space *mapping, - struct list_head *pages, - unsigned *nr_pages) +int __nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *rac) { - unsigned npages = *nr_pages; - int ret; + struct inode *inode = rac->mapping->host; - dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n", - nfs_i_fscache(inode), npages, inode); - - ret = fscache_read_or_alloc_pages(nfs_i_fscache(inode), - mapping, pages, nr_pages, - nfs_readpage_from_fscache_complete, - ctx, - mapping_gfp_mask(mapping)); - if (*nr_pages < npages) - nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK, - npages); - if (*nr_pages > 0) - nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL, - *nr_pages); + dfprintk(FSCACHE, "NFS: nfs_readahead_from_fscache (0x%p/0x%p)\n", + nfs_i_fscache(inode), inode); - switch (ret) { - case 0: /* read submitted to the cache for all pages */ - BUG_ON(!list_empty(pages)); - BUG_ON(*nr_pages != 0); - dfprintk(FSCACHE, - "NFS: nfs_getpages_from_fscache: submitted\n"); + netfs_readahead(rac, &nfs_fscache_req_ops, desc); - return ret; - - case -ENOBUFS: /* some pages aren't cached and can't be */ - case -ENODATA: /* some pages aren't cached */ - dfprintk(FSCACHE, - "NFS: nfs_getpages_from_fscache: no page: %d\n", ret); - return 1; - - default: - dfprintk(FSCACHE, - "NFS: nfs_getpages_from_fscache: ret %d\n", ret); - } - - return ret; + /* FIXME: NFSIOS_NFSIOS_FSCACHE_ stats */ + return 0; } /* diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h index 4a76a5f31772..d095e513af12 100644 --- a/fs/nfs/fscache.h +++ b/fs/nfs/fscache.h @@ -98,11 +98,10 @@ extern int nfs_fscache_release_page(struct page *, gfp_t); extern int __nfs_readpage_from_fscache(struct file *filp, struct page *page, struct nfs_readdesc *desc); -extern int __nfs_readpages_from_fscache(struct nfs_open_context *, - struct inode *, struct address_space *, - struct list_head *, unsigned *); -extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int); - +extern int __nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *rac); +extern void __nfs_read_completion_to_fscache(struct nfs_pgio_header *hdr, + unsigned long bytes); /* * wait for a page to complete writing to the cache */ @@ -139,15 +138,11 @@ static inline int nfs_readpage_from_fscache(struct file *filp, /* * Retrieve a set of pages from an inode data storage object. */ -static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx, - struct inode *inode, - struct address_space *mapping, - struct list_head *pages, - unsigned *nr_pages) +static inline int nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *rac) { - if (NFS_I(inode)->fscache) - return __nfs_readpages_from_fscache(ctx, inode, mapping, pages, - nr_pages); + if (NFS_I(rac->mapping->host)->fscache) + return __nfs_readahead_from_fscache(desc, rac); return -ENOBUFS; } @@ -217,11 +212,8 @@ static inline int nfs_readpage_from_fscache(struct file *filp, { return -ENOBUFS; } -static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx, - struct inode *inode, - struct address_space *mapping, - struct list_head *pages, - unsigned *nr_pages) +static inline int nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *rac) { return -ENOBUFS; } diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 7a76ab474fe0..da44ce68488c 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -390,50 +390,50 @@ int nfs_readpage(struct file *filp, struct page *page) return ret; } -int nfs_readpages(struct file *filp, struct address_space *mapping, - struct list_head *pages, unsigned nr_pages) +void nfs_readahead(struct readahead_control *rac) { struct nfs_readdesc desc; - struct inode *inode = mapping->host; + struct inode *inode = rac->mapping->host; + struct page *page; int ret; - dprintk("NFS: nfs_readpages (%s/%Lu %d)\n", - inode->i_sb->s_id, - (unsigned long long)NFS_FILEID(inode), - nr_pages); + dprintk("NFS: %s (%s/%llu %lld)\n", __func__, + inode->i_sb->s_id, + (unsigned long long)NFS_FILEID(inode), + readahead_length(rac)); nfs_inc_stats(inode, NFSIOS_VFSREADPAGES); ret = -ESTALE; if (NFS_STALE(inode)) - goto out; + return; - if (filp == NULL) { + if (rac->file == NULL) { ret = -EBADF; desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ); if (desc.ctx == NULL) - goto out; + return; } else - desc.ctx = get_nfs_open_context(nfs_file_open_context(filp)); + desc.ctx = get_nfs_open_context(nfs_file_open_context(rac->file)); /* attempt to read as many of the pages as possible from the cache * - this returns -ENOBUFS immediately if the cookie is negative */ - ret = nfs_readpages_from_fscache(desc.ctx, inode, mapping, - pages, &nr_pages); + ret = nfs_readahead_from_fscache(&desc, rac); if (ret == 0) goto read_complete; /* all pages were read */ nfs_pageio_init_read(&desc.pgio, inode, false, &nfs_async_read_completion_ops); - ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc); + while ((page = readahead_page(rac))) { + ret = readpage_async_filler(&desc, page); + put_page(page); + } nfs_pageio_complete_read(&desc.pgio, inode); read_complete: put_nfs_open_context(desc.ctx); -out: - return ret; } int __init nfs_init_readpagecache(void) diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 3cfcf219e96b..968c79b1b09b 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -568,8 +568,7 @@ nfs_have_writebacks(struct inode *inode) * linux/fs/nfs/read.c */ extern int nfs_readpage(struct file *, struct page *); -extern int nfs_readpages(struct file *, struct address_space *, - struct list_head *, unsigned); +extern void nfs_readahead(struct readahead_control *rac); /* * inline functions diff --git a/include/linux/nfs_iostat.h b/include/linux/nfs_iostat.h index 027874c36c88..8baf8fb7551d 100644 --- a/include/linux/nfs_iostat.h +++ b/include/linux/nfs_iostat.h @@ -53,7 +53,7 @@ * NFS page counters * * These count the number of pages read or written via nfs_readpage(), - * nfs_readpages(), or their write equivalents. + * nfs_readahead(), or their write equivalents. * * NB: When adding new byte counters, please include the measured * units in the name of each byte counter to help users of this