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Mon, 14 Sep 2020 06:29:30 -0700 (PDT) From: "=?UTF-8?q?Christian=20K=C3=B6nig?=" X-Google-Original-From: =?UTF-8?q?Christian=20K=C3=B6nig?= To: akpm@linux-foundation.org Subject: [PATCH 2/2] mm: introduce vma_set_file function Date: Mon, 14 Sep 2020 15:29:20 +0200 Message-Id: <20200914132920.59183-3-christian.koenig@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200914132920.59183-1-christian.koenig@amd.com> References: <20200914132920.59183-1-christian.koenig@amd.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" QWRkIHRoZSBuZXcgdm1hX3NldF9maWxlKCkgZnVuY3Rpb24gdG8gYWxsb3cgY2hhbmdpbmcKdm1h LT52bV9maWxlIHdpdGggdGhlIG5lY2Vzc2FyeSByZWZjb3VudCBkYW5jZS4KClNpZ25lZC1vZmYt Ynk6IENocmlzdGlhbiBLw7ZuaWcgPGNocmlzdGlhbi5rb2VuaWdAYW1kLmNvbT4KLS0tCiBkcml2 ZXJzL2RtYS1idWYvZG1hLWJ1Zi5jIHwgMTYgKysrKystLS0tLS0tLS0tLQogaW5jbHVkZS9saW51 eC9tbS5oICAgICAgICB8ICAyICsrCiBtbS9tbWFwLmMgICAgICAgICAgICAgICAgIHwgMTYgKysr KysrKysrKysrKysrKwogMyBmaWxlcyBjaGFuZ2VkLCAyMyBpbnNlcnRpb25zKCspLCAxMSBkZWxl dGlvbnMoLSkKCmRpZmYgLS1naXQgYS9kcml2ZXJzL2RtYS1idWYvZG1hLWJ1Zi5jIGIvZHJpdmVy cy9kbWEtYnVmL2RtYS1idWYuYwppbmRleCAxNjk5YThlMzA5ZWYuLjY3MmYzNTI1YmE3NCAxMDA2 NDQKLS0tIGEvZHJpdmVycy9kbWEtYnVmL2RtYS1idWYuYworKysgYi9kcml2ZXJzL2RtYS1idWYv ZG1hLWJ1Zi5jCkBAIC0xMTYzLDIwICsxMTYzLDE0IEBAIGludCBkbWFfYnVmX21tYXAoc3RydWN0 IGRtYV9idWYgKmRtYWJ1Ziwgc3RydWN0IHZtX2FyZWFfc3RydWN0ICp2bWEsCiAJCXJldHVybiAt RUlOVkFMOwogCiAJLyogcmVhZGp1c3QgdGhlIHZtYSAqLwotCWdldF9maWxlKGRtYWJ1Zi0+Zmls ZSk7Ci0Jb2xkZmlsZSA9IHZtYS0+dm1fZmlsZTsKLQl2bWEtPnZtX2ZpbGUgPSBkbWFidWYtPmZp bGU7CisJb2xkZmlsZSA9IHZtYV9zZXRfZmlsZSh2bWEsIGRtYWJ1Zi0+ZmlsZSk7CiAJdm1hLT52 bV9wZ29mZiA9IHBnb2ZmOwogCiAJcmV0ID0gZG1hYnVmLT5vcHMtPm1tYXAoZG1hYnVmLCB2bWEp OwotCWlmIChyZXQpIHsKLQkJLyogcmVzdG9yZSBvbGQgcGFyYW1ldGVycyBvbiBmYWlsdXJlICov Ci0JCXZtYS0+dm1fZmlsZSA9IG9sZGZpbGU7Ci0JCWZwdXQoZG1hYnVmLT5maWxlKTsKLQl9IGVs c2UgewotCQlpZiAob2xkZmlsZSkKLQkJCWZwdXQob2xkZmlsZSk7Ci0JfQorCS8qIHJlc3RvcmUg b2xkIHBhcmFtZXRlcnMgb24gZmFpbHVyZSAqLworCWlmIChyZXQpCisJCXZtYV9zZXRfZmlsZSh2 bWEsIG9sZGZpbGUpOworCiAJcmV0dXJuIHJldDsKIAogfQpkaWZmIC0tZ2l0IGEvaW5jbHVkZS9s aW51eC9tbS5oIGIvaW5jbHVkZS9saW51eC9tbS5oCmluZGV4IDE5ODNlMDhmNTkwNi4uMzk4YTZm ZGFhZDFlIDEwMDY0NAotLS0gYS9pbmNsdWRlL2xpbnV4L21tLmgKKysrIGIvaW5jbHVkZS9saW51 eC9tbS5oCkBAIC0yNjg4LDYgKzI2ODgsOCBAQCBzdGF0aWMgaW5saW5lIHZvaWQgdm1hX3NldF9w YWdlX3Byb3Qoc3RydWN0IHZtX2FyZWFfc3RydWN0ICp2bWEpCiB9CiAjZW5kaWYKIAorc3RydWN0 IGZpbGUgKnZtYV9zZXRfZmlsZShzdHJ1Y3Qgdm1fYXJlYV9zdHJ1Y3QgKnZtYSwgc3RydWN0IGZp bGUgKmZpbGUpOworCiAjaWZkZWYgQ09ORklHX05VTUFfQkFMQU5DSU5HCiB1bnNpZ25lZCBsb25n IGNoYW5nZV9wcm90X251bWEoc3RydWN0IHZtX2FyZWFfc3RydWN0ICp2bWEsCiAJCQl1bnNpZ25l ZCBsb25nIHN0YXJ0LCB1bnNpZ25lZCBsb25nIGVuZCk7CmRpZmYgLS1naXQgYS9tbS9tbWFwLmMg Yi9tbS9tbWFwLmMKaW5kZXggNDAyNDhkODRhZDVmLi5kM2MzYzUxMGY2NDMgMTAwNjQ0Ci0tLSBh L21tL21tYXAuYworKysgYi9tbS9tbWFwLmMKQEAgLTEzNiw2ICsxMzYsMjIgQEAgdm9pZCB2bWFf c2V0X3BhZ2VfcHJvdChzdHJ1Y3Qgdm1fYXJlYV9zdHJ1Y3QgKnZtYSkKIAlXUklURV9PTkNFKHZt YS0+dm1fcGFnZV9wcm90LCB2bV9wYWdlX3Byb3QpOwogfQogCisvKgorICogQ2hhbmdlIGJhY2tp bmcgZmlsZSwgb25seSB2YWxpZCB0byB1c2UgZHVyaW5nIGluaXRpYWwgVk1BIHNldHVwLgorICov CitzdHJ1Y3QgZmlsZSAqdm1hX3NldF9maWxlKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAqdm1hLCBz dHJ1Y3QgZmlsZSAqZmlsZSkKK3sKKwlpZiAoZmlsZSkKKwkgICAgICAgIGdldF9maWxlKGZpbGUp OworCisJc3dhcCh2bWEtPnZtX2ZpbGUsIGZpbGUpOworCisJaWYgKGZpbGUpCisJCWZwdXQoZmls ZSk7CisKKwlyZXR1cm4gZmlsZTsKK30KKwogLyoKICAqIFJlcXVpcmVzIGlub2RlLT5pX21hcHBp bmctPmlfbW1hcF9yd3NlbQogICovCi0tIAoyLjE3LjEKCl9fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5nIGxpc3QKZHJpLWRldmVs QGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWls bWFuL2xpc3RpbmZvL2RyaS1kZXZlbAo= From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 A16F7C43461 for ; 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Mon, 14 Sep 2020 06:29:31 -0700 (PDT) Received: from abel.fritz.box ([2a02:908:1252:fb60:6179:d701:8021:da3d]) by smtp.gmail.com with ESMTPSA id d6sm9575625edm.31.2020.09.14.06.29.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2020 06:29:30 -0700 (PDT) From: "=?UTF-8?q?Christian=20K=C3=B6nig?=" X-Google-Original-From: =?UTF-8?q?Christian=20K=C3=B6nig?= To: akpm@linux-foundation.org Cc: sumit.semwal@linaro.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 2/2] mm: introduce vma_set_file function Date: Mon, 14 Sep 2020 15:29:20 +0200 Message-Id: <20200914132920.59183-3-christian.koenig@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200914132920.59183-1-christian.koenig@amd.com> References: <20200914132920.59183-1-christian.koenig@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add the new vma_set_file() function to allow changing vma->vm_file with the necessary refcount dance. Signed-off-by: Christian König --- drivers/dma-buf/dma-buf.c | 16 +++++----------- include/linux/mm.h | 2 ++ mm/mmap.c | 16 ++++++++++++++++ 3 files changed, 23 insertions(+), 11 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 1699a8e309ef..672f3525ba74 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -1163,20 +1163,14 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, return -EINVAL; /* readjust the vma */ - get_file(dmabuf->file); - oldfile = vma->vm_file; - vma->vm_file = dmabuf->file; + oldfile = vma_set_file(vma, dmabuf->file); vma->vm_pgoff = pgoff; ret = dmabuf->ops->mmap(dmabuf, vma); - if (ret) { - /* restore old parameters on failure */ - vma->vm_file = oldfile; - fput(dmabuf->file); - } else { - if (oldfile) - fput(oldfile); - } + /* restore old parameters on failure */ + if (ret) + vma_set_file(vma, oldfile); + return ret; } diff --git a/include/linux/mm.h b/include/linux/mm.h index 1983e08f5906..398a6fdaad1e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2688,6 +2688,8 @@ static inline void vma_set_page_prot(struct vm_area_struct *vma) } #endif +struct file *vma_set_file(struct vm_area_struct *vma, struct file *file); + #ifdef CONFIG_NUMA_BALANCING unsigned long change_prot_numa(struct vm_area_struct *vma, unsigned long start, unsigned long end); diff --git a/mm/mmap.c b/mm/mmap.c index 40248d84ad5f..d3c3c510f643 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -136,6 +136,22 @@ void vma_set_page_prot(struct vm_area_struct *vma) WRITE_ONCE(vma->vm_page_prot, vm_page_prot); } +/* + * Change backing file, only valid to use during initial VMA setup. + */ +struct file *vma_set_file(struct vm_area_struct *vma, struct file *file) +{ + if (file) + get_file(file); + + swap(vma->vm_file, file); + + if (file) + fput(file); + + return file; +} + /* * Requires inode->i_mapping->i_mmap_rwsem */ -- 2.17.1