X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fnfs%2Ffile.c;h=5d2e9d9a4e28a390c15fd10a0c856baf2fe89058;hb=e43fe686e48835ca027559a068bbe0b6d264a254;hp=c664bb9214255eccdcba34e987a33f1deb1cbe10;hpb=cd3758e37ddea66fccca7d93c4b601e8a2e51926;p=linux-2.6

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index c664bb9214..5d2e9d9a4e 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -64,7 +64,11 @@ const struct file_operations nfs_file_operations = {
 	.write		= do_sync_write,
 	.aio_read	= nfs_file_read,
 	.aio_write	= nfs_file_write,
+#ifdef CONFIG_MMU
 	.mmap		= nfs_file_mmap,
+#else
+	.mmap		= generic_file_mmap,
+#endif
 	.open		= nfs_file_open,
 	.flush		= nfs_file_flush,
 	.release	= nfs_file_release,
@@ -131,7 +135,7 @@ nfs_file_release(struct inode *inode, struct file *filp)
 {
 	/* Ensure that dirty pages are flushed out with the right creds */
 	if (filp->f_mode & FMODE_WRITE)
-		filemap_fdatawrite(filp->f_mapping);
+		nfs_wb_all(filp->f_path.dentry->d_inode);
 	nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
 	return NFS_PROTO(inode)->file_release(inode, filp);
 }
@@ -306,27 +310,52 @@ nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 }
 
 /*
- * This does the "real" work of the write. The generic routine has
- * allocated the page, locked it, done all the page alignment stuff
- * calculations etc. Now we should just copy the data from user
- * space and write it back to the real medium..
+ * This does the "real" work of the write. We must allocate and lock the
+ * page to be sent back to the generic routine, which then copies the
+ * data from user space.
  *
  * If the writer ends up delaying the write, the writer needs to
  * increment the page use counts until he is done with the page.
  */
-static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+static int nfs_write_begin(struct file *file, struct address_space *mapping,
+			loff_t pos, unsigned len, unsigned flags,
+			struct page **pagep, void **fsdata)
 {
-	return nfs_flush_incompatible(file, page);
+	int ret;
+	pgoff_t index;
+	struct page *page;
+	index = pos >> PAGE_CACHE_SHIFT;
+
+	page = __grab_cache_page(mapping, index);
+	if (!page)
+		return -ENOMEM;
+	*pagep = page;
+
+	ret = nfs_flush_incompatible(file, page);
+	if (ret) {
+		unlock_page(page);
+		page_cache_release(page);
+	}
+	return ret;
 }
 
-static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+static int nfs_write_end(struct file *file, struct address_space *mapping,
+			loff_t pos, unsigned len, unsigned copied,
+			struct page *page, void *fsdata)
 {
-	long status;
+	unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
+	int status;
 
 	lock_kernel();
-	status = nfs_updatepage(file, page, offset, to-offset);
+	status = nfs_updatepage(file, page, offset, copied);
 	unlock_kernel();
-	return status;
+
+	unlock_page(page);
+	page_cache_release(page);
+
+	if (status < 0)
+		return status;
+	return copied;
 }
 
 static void nfs_invalidate_page(struct page *page, unsigned long offset)
@@ -354,8 +383,8 @@ const struct address_space_operations nfs_file_aops = {
 	.set_page_dirty = __set_page_dirty_nobuffers,
 	.writepage = nfs_writepage,
 	.writepages = nfs_writepages,
-	.prepare_write = nfs_prepare_write,
-	.commit_write = nfs_commit_write,
+	.write_begin = nfs_write_begin,
+	.write_end = nfs_write_end,
 	.invalidatepage = nfs_invalidate_page,
 	.releasepage = nfs_release_page,
 #ifdef CONFIG_NFS_DIRECTIO
@@ -369,16 +398,25 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page)
 	struct file *filp = vma->vm_file;
 	unsigned pagelen;
 	int ret = -EINVAL;
+	struct address_space *mapping;
 
 	lock_page(page);
-	if (page->mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping)
+	mapping = page->mapping;
+	if (mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping)
 		goto out_unlock;
+
+	ret = 0;
 	pagelen = nfs_page_length(page);
 	if (pagelen == 0)
 		goto out_unlock;
-	ret = nfs_prepare_write(filp, page, 0, pagelen);
-	if (!ret)
-		ret = nfs_commit_write(filp, page, 0, pagelen);
+
+	ret = nfs_flush_incompatible(filp, page);
+	if (ret != 0)
+		goto out_unlock;
+
+	ret = nfs_updatepage(filp, page, 0, pagelen);
+	if (ret == 0)
+		ret = pagelen;
 out_unlock:
 	unlock_page(page);
 	return ret;
@@ -577,8 +615,7 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
 	nfs_inc_stats(inode, NFSIOS_VFSLOCK);
 
 	/* No mandatory locks over NFS */
-	if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
-	    fl->fl_type != F_UNLCK)
+	if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 		return -ENOLCK;
 
 	if (IS_GETLK(cmd))