From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 576B121D0DE65 for ; Wed, 15 May 2019 12:27:34 -0700 (PDT) From: Vivek Goyal Subject: [PATCH v2 22/30] fuse, dax: add DAX mmap support Date: Wed, 15 May 2019 15:27:07 -0400 Message-Id: <20190515192715.18000-23-vgoyal@redhat.com> In-Reply-To: <20190515192715.18000-1-vgoyal@redhat.com> References: <20190515192715.18000-1-vgoyal@redhat.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-nvdimm@lists.01.org Cc: swhiteho@redhat.com, dgilbert@redhat.com, stefanha@redhat.com, miklos@szeredi.hu List-ID: From: Stefan Hajnoczi Add DAX mmap() support. Signed-off-by: Stefan Hajnoczi --- fs/fuse/file.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 63 insertions(+), 1 deletion(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index edbb11ca735e..a053bcb9498d 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -2576,10 +2576,15 @@ static const struct vm_operations_struct fuse_file_vm_ops = { .page_mkwrite = fuse_page_mkwrite, }; +static int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma); static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) { struct fuse_file *ff = file->private_data; + /* DAX mmap is superior to direct_io mmap */ + if (IS_DAX(file_inode(file))) + return fuse_dax_mmap(file, vma); + if (ff->open_flags & FOPEN_DIRECT_IO) { /* Can't provide the coherency needed for MAP_SHARED */ if (vma->vm_flags & VM_MAYSHARE) @@ -2611,9 +2616,65 @@ static ssize_t fuse_file_splice_read(struct file *in, loff_t *ppos, } +static int __fuse_dax_fault(struct vm_fault *vmf, enum page_entry_size pe_size, + bool write) +{ + vm_fault_t ret; + struct inode *inode = file_inode(vmf->vma->vm_file); + struct super_block *sb = inode->i_sb; + pfn_t pfn; + + if (write) + sb_start_pagefault(sb); + + /* TODO inode semaphore to protect faults vs truncate */ + + ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL, &fuse_iomap_ops); + + if (ret & VM_FAULT_NEEDDSYNC) + ret = dax_finish_sync_fault(vmf, pe_size, pfn); + + if (write) + sb_end_pagefault(sb); + + return ret; +} + +static vm_fault_t fuse_dax_fault(struct vm_fault *vmf) +{ + return __fuse_dax_fault(vmf, PE_SIZE_PTE, + vmf->flags & FAULT_FLAG_WRITE); +} + +static vm_fault_t fuse_dax_huge_fault(struct vm_fault *vmf, + enum page_entry_size pe_size) +{ + return __fuse_dax_fault(vmf, pe_size, vmf->flags & FAULT_FLAG_WRITE); +} + +static vm_fault_t fuse_dax_page_mkwrite(struct vm_fault *vmf) +{ + return __fuse_dax_fault(vmf, PE_SIZE_PTE, true); +} + +static vm_fault_t fuse_dax_pfn_mkwrite(struct vm_fault *vmf) +{ + return __fuse_dax_fault(vmf, PE_SIZE_PTE, true); +} + +static const struct vm_operations_struct fuse_dax_vm_ops = { + .fault = fuse_dax_fault, + .huge_fault = fuse_dax_huge_fault, + .page_mkwrite = fuse_dax_page_mkwrite, + .pfn_mkwrite = fuse_dax_pfn_mkwrite, +}; + static int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma) { - return -EINVAL; /* TODO */ + file_accessed(file); + vma->vm_ops = &fuse_dax_vm_ops; + vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; + return 0; } static int convert_fuse_file_lock(struct fuse_conn *fc, @@ -3622,6 +3683,7 @@ static const struct file_operations fuse_file_operations = { .release = fuse_release, .fsync = fuse_fsync, .lock = fuse_file_lock, + .get_unmapped_area = thp_get_unmapped_area, .flock = fuse_file_flock, .splice_read = fuse_file_splice_read, .splice_write = iter_file_splice_write, -- 2.20.1 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm