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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 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 X-Rspamd-Queue-Id: 11A8A18034F4A X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add the new vma_set_file() function to allow changing vma->vm_file with the necessary refcount dance. Signed-off-by: Christian K=C3=B6nig --- 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 v= m_area_struct *vma, return -EINVAL; =20 /* readjust the vma */ - get_file(dmabuf->file); - oldfile =3D vma->vm_file; - vma->vm_file =3D dmabuf->file; + oldfile =3D vma_set_file(vma, dmabuf->file); vma->vm_pgoff =3D pgoff; =20 ret =3D dmabuf->ops->mmap(dmabuf, vma); - if (ret) { - /* restore old parameters on failure */ - vma->vm_file =3D oldfile; - fput(dmabuf->file); - } else { - if (oldfile) - fput(oldfile); - } + /* restore old parameters on failure */ + if (ret) + vma_set_file(vma, oldfile); + return ret; =20 } 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 =20 +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); } =20 +/* + * 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 */ --=20 2.17.1