powerpc/spufs: allow spufs files to specify sizes

Currently, spufs never specifies the i_size for the files in context
directories, so stat() always reports 0-byte files.

This change adds allows the spufs_dir_(nosched_)contents arrays to
specify a file size. This allows stat() to report correct file sizes,
and makes SEEK_END work.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

arch/powerpc/platforms/cell/spufs/file.c

@@ -2607,7 +2607,7 @@ static const struct file_operations spufs_ctx_fops = {
 	.release        = single_release,
 };
 
-struct tree_descr spufs_dir_contents[] = {
+struct spufs_tree_descr spufs_dir_contents[] = {
 	{ "capabilities", &spufs_caps_fops, 0444, },
 	{ "mem",  &spufs_mem_fops,  0666, },
 	{ "regs", &spufs_regs_fops,  0666, },
@@ -2647,7 +2647,7 @@ struct tree_descr spufs_dir_contents[] = {
 	{},
 };
 
-struct tree_descr spufs_dir_nosched_contents[] = {
+struct spufs_tree_descr spufs_dir_nosched_contents[] = {
 	{ "capabilities", &spufs_caps_fops, 0444, },
 	{ "mem",  &spufs_mem_fops,  0666, },
 	{ "mbox", &spufs_mbox_fops, 0444, },

arch/powerpc/platforms/cell/spufs/inode.c

@@ -109,7 +109,7 @@ spufs_setattr(struct dentry *dentry, struct iattr *attr)
 static int
 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 		const struct file_operations *fops, int mode,
-		struct spu_context *ctx)
+		size_t size, struct spu_context *ctx)
 {
 	static struct inode_operations spufs_file_iops = {
 		.setattr = spufs_setattr,
@@ -125,6 +125,7 @@ spufs_new_file(struct super_block *sb, struct dentry *dentry,
 	ret = 0;
 	inode->i_op = &spufs_file_iops;
 	inode->i_fop = fops;
+	inode->i_size = size;
 	inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 	d_add(dentry, inode);
 out:
@@ -177,7 +178,7 @@ static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 	return simple_rmdir(parent, dir);
 }
 
-static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
+static int spufs_fill_dir(struct dentry *dir, struct spufs_tree_descr *files,
 			  int mode, struct spu_context *ctx)
 {
 	struct dentry *dentry, *tmp;
@@ -189,7 +190,7 @@ static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
 		if (!dentry)
 			goto out;
 		ret = spufs_new_file(dir->d_sb, dentry, files->ops,
-					files->mode & mode, ctx);
+					files->mode & mode, files->size, ctx);
 		if (ret)
 			goto out;
 		files++;

arch/powerpc/platforms/cell/spufs/spufs.h

@@ -235,8 +235,15 @@ struct spufs_inode_info {
 #define SPUFS_I(inode) \
 	container_of(inode, struct spufs_inode_info, vfs_inode)
 
-extern struct tree_descr spufs_dir_contents[];
-extern struct tree_descr spufs_dir_nosched_contents[];
+struct spufs_tree_descr {
+	const char *name;
+	const struct file_operations *ops;
+	int mode;
+	size_t size;
+};
+
+extern struct spufs_tree_descr spufs_dir_contents[];
+extern struct spufs_tree_descr spufs_dir_nosched_contents[];
 
 /* system call implementation */
 extern struct spufs_calls spufs_calls;