From patchwork Thu Apr 8 23:43:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Axel Rasmussen X-Patchwork-Id: 12192661 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3039CC4360C for ; Thu, 8 Apr 2021 23:43:51 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C56E461159 for ; Thu, 8 Apr 2021 23:43:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C56E461159 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4BB328E0008; Thu, 8 Apr 2021 19:43:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 472198E0001; Thu, 8 Apr 2021 19:43:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1FD098E0008; Thu, 8 Apr 2021 19:43:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0004.hostedemail.com [216.40.44.4]) by kanga.kvack.org (Postfix) with ESMTP id E3FC58E0001 for ; Thu, 8 Apr 2021 19:43:48 -0400 (EDT) Received: from smtpin35.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id AB0349983 for ; Thu, 8 Apr 2021 23:43:48 +0000 (UTC) X-FDA: 78010829736.35.8D8A327 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) by imf28.hostedemail.com (Postfix) with ESMTP id D7262200025C for ; Thu, 8 Apr 2021 23:43:48 +0000 (UTC) Received: by mail-yb1-f201.google.com with SMTP id k15so3612727ybh.6 for ; Thu, 08 Apr 2021 16:43:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=SA+DqFU+tgMShZZq9qaZAZYTg8gGJxsmK6MPTeE2ry8=; b=uKP3BtZibz2XAPKw4vvNyzwrxvh/ZYYDs9RxYJl2+CpRzB2Z5KFuRqca9wKV9UKTYa UqAJwFGddPUBBBbAxB08uVP/Z+1Kx9WTvOs6zi4Q0Y48GFxPz46Pywb/cXM1zwRYuziU 5AfjajljiCrur5A/ggK6zMwzsmHt4CpBD4/kxC0eTFVkxrMUzI3XP/NzU011N5oh5l8E mEZoflUq/RpYdw6cGlqAAj+0oS4q8rhNcPPEG59ModK2vJ5jEC3dzmv2DaYivMTEtYP2 O0Qz0Jz8dkwc7Jo2IIXs0AyRKjNLh/dHuakZHeaFgxVcK8Oa6UNTqyOYWP2RqfXmVT6Q oAhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=SA+DqFU+tgMShZZq9qaZAZYTg8gGJxsmK6MPTeE2ry8=; b=bdAlF6/HTMR5jb/P65bYSypncD164MGpgNZLLiWiSfGnUW0tlZiodRQFv3/IAKXxUW tdi/xqT2QZJD21guDdGR4QwX1CtHleaIxA/oApCvwMnHAZkrplltmAOrL33gKLOPpeae ntiQPNWqh5D5Eed8kZclhxxi+2YuxXkRFy73liN4bHVgJfn/Bet/ct7ba4C7FnKGAHRK zLgX8QXpKE0aWPkBtKiZkIts7IOsSRB17Y7uaETj6SEuI9+gduUl7DF0uG+SGYSIeW1S Z7zuUAETVcJodugANXs67Y5u9WBbL06cGpM9T3CdN94pECz9Z8P/ugjUfFKLKGqzFW1U 1HnA== X-Gm-Message-State: AOAM532IY8E1CbXappfFP57cIh4F1lCP7gebBvMoJSORV40bg7gyZ2R/ fmWRb0MfArdNddkleAoltrEwylMh2/SVxA5NGB/w X-Google-Smtp-Source: ABdhPJxuajF5zhvsVdOW0fkBia17zTyP9ZyuXT52doUy8oHVIE8g4t2RV/j5GXkZwQczAVAFQfTPCu3qCD1utqi0DImA X-Received: from ajr0.svl.corp.google.com ([2620:15c:2cd:203:3d06:d00f:a626:675a]) (user=axelrasmussen job=sendgmr) by 2002:a25:a265:: with SMTP id b92mr14490367ybi.486.1617925427524; Thu, 08 Apr 2021 16:43:47 -0700 (PDT) Date: Thu, 8 Apr 2021 16:43:27 -0700 In-Reply-To: <20210408234327.624367-1-axelrasmussen@google.com> Message-Id: <20210408234327.624367-10-axelrasmussen@google.com> Mime-Version: 1.0 References: <20210408234327.624367-1-axelrasmussen@google.com> X-Mailer: git-send-email 2.31.1.295.g9ea45b61b8-goog Subject: [PATCH 9/9] userfaultfd/shmem: modify shmem_mcopy_atomic_pte to use install_ptes From: Axel Rasmussen To: Alexander Viro , Andrea Arcangeli , Andrew Morton , Daniel Colascione , Hugh Dickins , Jerome Glisse , Joe Perches , Lokesh Gidra , Mike Kravetz , Mike Rapoport , Peter Xu , Shaohua Li , Shuah Khan , Stephen Rothwell , Wang Qing Cc: linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Axel Rasmussen , Brian Geffon , "Dr . David Alan Gilbert" , Mina Almasry , Oliver Upton X-Rspamd-Queue-Id: D7262200025C X-Stat-Signature: hx7zryerzhdqziymwsbgiqpwq6idm6bb X-Rspamd-Server: rspam02 Received-SPF: none (flex--axelrasmussen.bounces.google.com>: No applicable sender policy available) receiver=imf28; identity=mailfrom; envelope-from="<3M5VvYA0KCCYCZGNTCUOWUUGPIQQING.EQONKPWZ-OOMXCEM.QTI@flex--axelrasmussen.bounces.google.com>"; helo=mail-yb1-f201.google.com; client-ip=209.85.219.201 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617925428-120312 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: In a previous commit, we added the mcopy_atomic_install_ptes() helper. This helper does the job of setting up PTEs for an existing page, to map it into a given VMA. It deals with both the anon and shmem cases, as well as the shared and private cases. In other words, shmem_mcopy_atomic_pte() duplicates a case it already handles. So, expose it, and let shmem_mcopy_atomic_pte() use it directly, to reduce code duplication. This requires that we refactor shmem_mcopy_atomic-pte() a bit: Instead of doing accounting (shmem_recalc_inode() et al) part-way through the PTE setup, do it beforehand. This frees up mcopy_atomic_install_ptes() from having to care about this accounting, but it does mean we need to clean it up if we get a failure afterwards (shmem_uncharge()). We can *almost* use shmem_charge() to do this, reducing code duplication. But, it does `inode->i_mapping->nrpages++`, which would double-count since shmem_add_to_page_cache() also does this. Signed-off-by: Axel Rasmussen --- include/linux/userfaultfd_k.h | 5 ++++ mm/shmem.c | 52 +++++++---------------------------- mm/userfaultfd.c | 25 ++++++++--------- 3 files changed, 27 insertions(+), 55 deletions(-) diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h index 794d1538b8ba..3e20bfa9ef80 100644 --- a/include/linux/userfaultfd_k.h +++ b/include/linux/userfaultfd_k.h @@ -53,6 +53,11 @@ enum mcopy_atomic_mode { MCOPY_ATOMIC_CONTINUE, }; +extern int mcopy_atomic_install_ptes(struct mm_struct *dst_mm, pmd_t *dst_pmd, + struct vm_area_struct *dst_vma, + unsigned long dst_addr, struct page *page, + bool newly_allocated, bool wp_copy); + extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start, unsigned long src_start, unsigned long len, bool *mmap_changing, __u64 mode); diff --git a/mm/shmem.c b/mm/shmem.c index 99c54b165c16..5d4b82e9bcb2 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2380,10 +2380,8 @@ int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, struct address_space *mapping = inode->i_mapping; gfp_t gfp = mapping_gfp_mask(mapping); pgoff_t pgoff = linear_page_index(dst_vma, dst_addr); - spinlock_t *ptl; void *page_kaddr; struct page *page; - pte_t _dst_pte, *dst_pte; int ret; pgoff_t max_off; @@ -2393,8 +2391,10 @@ int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, if (!*pagep) { page = shmem_alloc_page(gfp, info, pgoff); - if (!page) - goto out_unacct_blocks; + if (!page) { + shmem_inode_unacct_blocks(inode, 1); + goto out; + } if (!zeropage) { /* COPY */ page_kaddr = kmap_atomic(page); @@ -2434,59 +2434,27 @@ int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, if (ret) goto out_release; - _dst_pte = mk_pte(page, dst_vma->vm_page_prot); - if (dst_vma->vm_flags & VM_WRITE) - _dst_pte = pte_mkwrite(pte_mkdirty(_dst_pte)); - else { - /* - * We don't set the pte dirty if the vma has no - * VM_WRITE permission, so mark the page dirty or it - * could be freed from under us. We could do it - * unconditionally before unlock_page(), but doing it - * only if VM_WRITE is not set is faster. - */ - set_page_dirty(page); - } - - dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl); - - ret = -EFAULT; - max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); - if (unlikely(pgoff >= max_off)) - goto out_release_unlock; - - ret = -EEXIST; - if (!pte_none(*dst_pte)) - goto out_release_unlock; - - lru_cache_add(page); - spin_lock_irq(&info->lock); info->alloced++; inode->i_blocks += BLOCKS_PER_PAGE; shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); - inc_mm_counter(dst_mm, mm_counter_file(page)); - page_add_file_rmap(page, false); - set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte); + ret = mcopy_atomic_install_ptes(dst_mm, dst_pmd, dst_vma, dst_addr, + page, true, false); + if (ret) + goto out_release_uncharge; - /* No need to invalidate - it was non-present before */ - update_mmu_cache(dst_vma, dst_addr, dst_pte); - pte_unmap_unlock(dst_pte, ptl); unlock_page(page); ret = 0; out: return ret; -out_release_unlock: - pte_unmap_unlock(dst_pte, ptl); - ClearPageDirty(page); +out_release_uncharge: delete_from_page_cache(page); + shmem_uncharge(inode, 1); out_release: unlock_page(page); put_page(page); -out_unacct_blocks: - shmem_inode_unacct_blocks(inode, 1); goto out; } #endif /* CONFIG_USERFAULTFD */ diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index a539fe18b9a7..8fc597782219 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -51,18 +51,13 @@ struct vm_area_struct *find_dst_vma(struct mm_struct *dst_mm, /* * Install PTEs, to map dst_addr (within dst_vma) to page. * - * This function handles MCOPY_ATOMIC_CONTINUE (which is always file-backed), - * whether or not dst_vma is VM_SHARED. It also handles the more general - * MCOPY_ATOMIC_NORMAL case, when dst_vma is *not* VM_SHARED (it may be file - * backed, or not). - * - * Note that MCOPY_ATOMIC_NORMAL for a VM_SHARED dst_vma is handled by - * shmem_mcopy_atomic_pte instead. + * This function handles both MCOPY_ATOMIC_NORMAL and _CONTINUE for both shmem + * and anon, and for both shared and private VMAs. */ -static int mcopy_atomic_install_ptes(struct mm_struct *dst_mm, pmd_t *dst_pmd, - struct vm_area_struct *dst_vma, - unsigned long dst_addr, struct page *page, - bool newly_allocated, bool wp_copy) +int mcopy_atomic_install_ptes(struct mm_struct *dst_mm, pmd_t *dst_pmd, + struct vm_area_struct *dst_vma, + unsigned long dst_addr, struct page *page, + bool newly_allocated, bool wp_copy) { int ret; pte_t _dst_pte, *dst_pte; @@ -116,8 +111,12 @@ static int mcopy_atomic_install_ptes(struct mm_struct *dst_mm, pmd_t *dst_pmd, else page_add_new_anon_rmap(page, dst_vma, dst_addr, false); - if (newly_allocated) - lru_cache_add_inactive_or_unevictable(page, dst_vma); + if (newly_allocated) { + if (vma_is_shmem(dst_vma) && vm_shared) + lru_cache_add(page); + else + lru_cache_add_inactive_or_unevictable(page, dst_vma); + } set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);