From patchwork Wed May 15 19:27:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Goyal X-Patchwork-Id: 10945223 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2956292A for ; Wed, 15 May 2019 19:30:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1050C28609 for ; Wed, 15 May 2019 19:30:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 041FD2863F; Wed, 15 May 2019 19:30:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7C94C28609 for ; Wed, 15 May 2019 19:30:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726677AbfEOT1e (ORCPT ); Wed, 15 May 2019 15:27:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49638 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727526AbfEOT1e (ORCPT ); Wed, 15 May 2019 15:27:34 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id AAA2285A04; Wed, 15 May 2019 19:27:33 +0000 (UTC) Received: from horse.redhat.com (unknown [10.18.25.29]) by smtp.corp.redhat.com (Postfix) with ESMTP id 859F05D723; Wed, 15 May 2019 19:27:33 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id DC60A225487; Wed, 15 May 2019 15:27:29 -0400 (EDT) From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-nvdimm@lists.01.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, swhiteho@redhat.com Subject: [PATCH v2 19/30] fuse: Keep a list of free dax memory ranges Date: Wed, 15 May 2019 15:27:04 -0400 Message-Id: <20190515192715.18000-20-vgoyal@redhat.com> In-Reply-To: <20190515192715.18000-1-vgoyal@redhat.com> References: <20190515192715.18000-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 15 May 2019 19:27:33 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Divide the dax memory range into fixed size ranges (2MB for now) and put them in a list. This will track free ranges. Once an inode requires a free range, we will take one from here and put it in interval-tree of ranges assigned to inode. Signed-off-by: Vivek Goyal Signed-off-by: Peng Tao --- fs/fuse/fuse_i.h | 23 ++++++++++++ fs/fuse/inode.c | 86 +++++++++++++++++++++++++++++++++++++++++++++ fs/fuse/virtio_fs.c | 2 ++ 3 files changed, 111 insertions(+) diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 840c88af711c..5439e4628362 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -46,6 +46,10 @@ /** Number of page pointers embedded in fuse_req */ #define FUSE_REQ_INLINE_PAGES 1 +/* Default memory range size, 2MB */ +#define FUSE_DAX_MEM_RANGE_SZ (2*1024*1024) +#define FUSE_DAX_MEM_RANGE_PAGES (FUSE_DAX_MEM_RANGE_SZ/PAGE_SIZE) + /** List of active connections */ extern struct list_head fuse_conn_list; @@ -94,6 +98,18 @@ struct fuse_forget_link { struct fuse_forget_link *next; }; +/** Translation information for file offsets to DAX window offsets */ +struct fuse_dax_mapping { + /* Will connect in fc->free_ranges to keep track of free memory */ + struct list_head list; + + /** Position in DAX window */ + u64 window_offset; + + /** Length of mapping, in bytes */ + loff_t length; +}; + /** FUSE inode */ struct fuse_inode { /** Inode data */ @@ -829,6 +845,13 @@ struct fuse_conn { /** DAX device, non-NULL if DAX is supported */ struct dax_device *dax_dev; + + /* + * DAX Window Free Ranges. TODO: This might not be best place to store + * this free list + */ + long nr_free_ranges; + struct list_head free_ranges; }; static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 97d218a7daa8..8a3dd72f9843 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -22,6 +22,8 @@ #include #include #include +#include +#include MODULE_AUTHOR("Miklos Szeredi "); MODULE_DESCRIPTION("Filesystem in Userspace"); @@ -610,6 +612,76 @@ static void fuse_pqueue_init(struct fuse_pqueue *fpq) fpq->connected = 1; } +static void fuse_free_dax_mem_ranges(struct list_head *mem_list) +{ + struct fuse_dax_mapping *range, *temp; + + /* Free All allocated elements */ + list_for_each_entry_safe(range, temp, mem_list, list) { + list_del(&range->list); + kfree(range); + } +} + +#ifdef CONFIG_FS_DAX +static int fuse_dax_mem_range_init(struct fuse_conn *fc, + struct dax_device *dax_dev) +{ + long nr_pages, nr_ranges; + void *kaddr; + pfn_t pfn; + struct fuse_dax_mapping *range; + LIST_HEAD(mem_ranges); + phys_addr_t phys_addr; + int ret = 0, id; + size_t dax_size = -1; + unsigned long i; + + id = dax_read_lock(); + nr_pages = dax_direct_access(dax_dev, 0, PHYS_PFN(dax_size), &kaddr, + &pfn); + dax_read_unlock(id); + if (nr_pages < 0) { + pr_debug("dax_direct_access() returned %ld\n", nr_pages); + return nr_pages; + } + + phys_addr = pfn_t_to_phys(pfn); + nr_ranges = nr_pages/FUSE_DAX_MEM_RANGE_PAGES; + printk("fuse_dax_mem_range_init(): dax mapped %ld pages. nr_ranges=%ld\n", nr_pages, nr_ranges); + + for (i = 0; i < nr_ranges; i++) { + range = kzalloc(sizeof(struct fuse_dax_mapping), GFP_KERNEL); + if (!range) { + pr_debug("memory allocation for mem_range failed.\n"); + ret = -ENOMEM; + goto out_err; + } + /* TODO: This offset only works if virtio-fs driver is not + * having some memory hidden at the beginning. This needs + * better handling + */ + range->window_offset = i * FUSE_DAX_MEM_RANGE_SZ; + range->length = FUSE_DAX_MEM_RANGE_SZ; + list_add_tail(&range->list, &mem_ranges); + } + + list_replace_init(&mem_ranges, &fc->free_ranges); + fc->nr_free_ranges = nr_ranges; + return 0; +out_err: + /* Free All allocated elements */ + fuse_free_dax_mem_ranges(&mem_ranges); + return ret; +} +#else /* !CONFIG_FS_DAX */ +static inline int fuse_dax_mem_range_init(struct fuse_conn *fc, + struct dax_device *dax_dev) +{ + return 0; +} +#endif /* CONFIG_FS_DAX */ + void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns, struct dax_device *dax_dev, const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv) @@ -640,6 +712,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns, fc->dax_dev = dax_dev; fc->user_ns = get_user_ns(user_ns); fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; + INIT_LIST_HEAD(&fc->free_ranges); } EXPORT_SYMBOL_GPL(fuse_conn_init); @@ -648,6 +721,8 @@ void fuse_conn_put(struct fuse_conn *fc) if (refcount_dec_and_test(&fc->count)) { if (fc->destroy_req) fuse_request_free(fc->destroy_req); + if (fc->dax_dev) + fuse_free_dax_mem_ranges(&fc->free_ranges); put_pid_ns(fc->pid_ns); put_user_ns(fc->user_ns); fc->release(fc); @@ -1154,6 +1229,14 @@ int fuse_fill_super_common(struct super_block *sb, mount_data->fiq_ops, mount_data->fiq_priv); fc->release = fuse_free_conn; + if (mount_data->dax_dev) { + err = fuse_dax_mem_range_init(fc, mount_data->dax_dev); + if (err) { + pr_debug("fuse_dax_mem_range_init() returned %d\n", err); + goto err_free_ranges; + } + } + fud = fuse_dev_alloc_install(fc); if (!fud) goto err_put_conn; @@ -1214,6 +1297,9 @@ int fuse_fill_super_common(struct super_block *sb, dput(root_dentry); err_dev_free: fuse_dev_free(fud); + err_free_ranges: + if (mount_data->dax_dev) + fuse_free_dax_mem_ranges(&fc->free_ranges); err_put_conn: fuse_conn_put(fc); sb->s_fs_info = NULL; diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c index 2b790865dc21..76c46edcc8ac 100644 --- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -453,6 +453,8 @@ static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, phys_addr_t offset = PFN_PHYS(pgoff); size_t max_nr_pages = fs->window_len/PAGE_SIZE - pgoff; + pr_debug("virtio_fs_direct_access(): called. nr_pages=%ld max_nr_pages=%zu\n", nr_pages, max_nr_pages); + if (kaddr) *kaddr = fs->window_kaddr + offset; if (pfn)