From 4f57dbc6b5bae5a3978d429f45ac597ca7a3b8c6 Mon Sep 17 00:00:00 2001 From: David Chinner Date: Thu, 19 Jul 2007 16:28:17 +1000 Subject: [PATCH] [XFS] Implement ->page_mkwrite in XFS. Hook XFS up to ->page_mkwrite to ensure that we know about mmap pages being written to. This allows use to do correct delayed allocation and ENOSPC checking as well as remap unwritten extents so that they get converted correctly during writeback. This is done via the generic block_page_mkwrite code. SGI-PV: 940392 SGI-Modid: xfs-linux-melb:xfs-kern:29149a Signed-off-by: David Chinner Signed-off-by: Christoph Hellwig Signed-off-by: Tim Shimmin --- fs/xfs/linux-2.6/xfs_file.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c index cbcd40c8c2a0..b4c936485d11 100644 --- a/fs/xfs/linux-2.6/xfs_file.c +++ b/fs/xfs/linux-2.6/xfs_file.c @@ -413,6 +413,20 @@ xfs_file_open_exec( } #endif /* HAVE_FOP_OPEN_EXEC */ +/* + * mmap()d file has taken write protection fault and is being made + * writable. We can set the page state up correctly for a writable + * page, which means we can do correct delalloc accounting (ENOSPC + * checking!) and unwritten extent mapping. + */ +STATIC int +xfs_vm_page_mkwrite( + struct vm_area_struct *vma, + struct page *page) +{ + return block_page_mkwrite(vma, page, xfs_get_blocks); +} + const struct file_operations xfs_file_operations = { .llseek = generic_file_llseek, .read = do_sync_read, @@ -466,12 +480,14 @@ const struct file_operations xfs_dir_file_operations = { static struct vm_operations_struct xfs_file_vm_ops = { .nopage = filemap_nopage, .populate = filemap_populate, + .page_mkwrite = xfs_vm_page_mkwrite, }; #ifdef CONFIG_XFS_DMAPI static struct vm_operations_struct xfs_dmapi_file_vm_ops = { .nopage = xfs_vm_nopage, .populate = filemap_populate, + .page_mkwrite = xfs_vm_page_mkwrite, #ifdef HAVE_VMOP_MPROTECT .mprotect = xfs_vm_mprotect, #endif -- GitLab