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Mon, 07 Dec 2020 03:34:32 -0800 (PST) From: yulei.kernel@gmail.com X-Google-Original-From: yuleixzhang@tencent.com To: linux-mm@kvack.org, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, naoya.horiguchi@nec.com, viro@zeniv.linux.org.uk, pbonzini@redhat.com Cc: joao.m.martins@oracle.com, rdunlap@infradead.org, sean.j.christopherson@intel.com, xiaoguangrong.eric@gmail.com, kernellwp@gmail.com, lihaiwei.kernel@gmail.com, Yulei Zhang , Chen Zhuo Subject: [RFC V2 16/37] dmemfs: introduce ->split() to dmemfs_vm_ops Date: Mon, 7 Dec 2020 19:31:09 +0800 Message-Id: <6b3c166a8d5827a1f6f2a33d85feae1c1633a45d.1607332046.git.yuleixzhang@tencent.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: From: Yulei Zhang It is required by __split_vma() to adjust vma. munmap() which create hole unaligned to pagesize in dmemfs-mapping should be forbidden. Signed-off-by: Chen Zhuo Signed-off-by: Yulei Zhang --- fs/dmemfs/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/dmemfs/inode.c b/fs/dmemfs/inode.c index 443f2e1..ab6a492 100644 --- a/fs/dmemfs/inode.c +++ b/fs/dmemfs/inode.c @@ -450,6 +450,13 @@ static bool check_vma_access(struct vm_area_struct *= vma, int write) return len; } =20 +static int dmemfs_split(struct vm_area_struct *vma, unsigned long addr) +{ + if (addr & (dmem_page_size(file_inode(vma->vm_file)) - 1)) + return -EINVAL; + return 0; +} + static vm_fault_t dmemfs_fault(struct vm_fault *vmf) { struct vm_area_struct *vma =3D vmf->vma; @@ -484,6 +491,7 @@ static unsigned long dmemfs_pagesize(struct vm_area_s= truct *vma) } =20 static const struct vm_operations_struct dmemfs_vm_ops =3D { + .split =3D dmemfs_split, .fault =3D dmemfs_fault, .pagesize =3D dmemfs_pagesize, .access =3D dmemfs_access_dmem, --=20 1.8.3.1