From: "Darrick J. Wong" Subject: Re: [PATCH 17/18] xfs: Implement xfs_filemap_pfn_mkwrite() using __xfs_filemap_fault() Date: Mon, 13 Nov 2017 18:19:13 -0800 Message-ID: <20171114021913.GH25227@magnolia> References: <20171101153648.30166-1-jack@suse.cz> <20171101153648.30166-18-jack@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Christoph Hellwig , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jan Kara Return-path: Content-Disposition: inline In-Reply-To: <20171101153648.30166-18-jack-AlSwsSmVLrQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" List-Id: linux-ext4.vger.kernel.org On Wed, Nov 01, 2017 at 04:36:46PM +0100, Jan Kara wrote: > xfs_filemap_pfn_mkwrite() duplicates a lot of __xfs_filemap_fault(). > It will also need to handle flushing for synchronous page faults. So > just make that function use __xfs_filemap_fault(). > > Signed-off-by: Jan Kara Looks ok, Reviewed-by: Darrick J. Wong > --- > fs/xfs/xfs_file.c | 29 ++++------------------------- > fs/xfs/xfs_trace.h | 2 -- > 2 files changed, 4 insertions(+), 27 deletions(-) > > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > index 7c6b8def6eed..4496b45678de 100644 > --- a/fs/xfs/xfs_file.c > +++ b/fs/xfs/xfs_file.c > @@ -1085,37 +1085,16 @@ xfs_filemap_page_mkwrite( > } > > /* > - * pfn_mkwrite was originally inteneded to ensure we capture time stamp > - * updates on write faults. In reality, it's need to serialise against > - * truncate similar to page_mkwrite. Hence we cycle the XFS_MMAPLOCK_SHARED > - * to ensure we serialise the fault barrier in place. > + * pfn_mkwrite was originally intended to ensure we capture time stamp updates > + * on write faults. In reality, it needs to serialise against truncate and > + * prepare memory for writing so handle is as standard write fault. > */ > static int > xfs_filemap_pfn_mkwrite( > struct vm_fault *vmf) > { > > - struct inode *inode = file_inode(vmf->vma->vm_file); > - struct xfs_inode *ip = XFS_I(inode); > - int ret = VM_FAULT_NOPAGE; > - loff_t size; > - > - trace_xfs_filemap_pfn_mkwrite(ip); > - > - sb_start_pagefault(inode->i_sb); > - file_update_time(vmf->vma->vm_file); > - > - /* check if the faulting page hasn't raced with truncate */ > - xfs_ilock(ip, XFS_MMAPLOCK_SHARED); > - size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; > - if (vmf->pgoff >= size) > - ret = VM_FAULT_SIGBUS; > - else if (IS_DAX(inode)) > - ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops); > - xfs_iunlock(ip, XFS_MMAPLOCK_SHARED); > - sb_end_pagefault(inode->i_sb); > - return ret; > - > + return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true); > } > > static const struct vm_operations_struct xfs_file_vm_ops = { > diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h > index bb5514688d47..6333ad09e0f3 100644 > --- a/fs/xfs/xfs_trace.h > +++ b/fs/xfs/xfs_trace.h > @@ -688,8 +688,6 @@ DEFINE_INODE_EVENT(xfs_inode_set_cowblocks_tag); > DEFINE_INODE_EVENT(xfs_inode_clear_cowblocks_tag); > DEFINE_INODE_EVENT(xfs_inode_free_cowblocks_invalid); > > -DEFINE_INODE_EVENT(xfs_filemap_pfn_mkwrite); > - > TRACE_EVENT(xfs_filemap_fault, > TP_PROTO(struct xfs_inode *ip, enum page_entry_size pe_size, > bool write_fault), > -- > 2.12.3 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > More majordomo info at http://vger.kernel.org/majordomo-info.html