xfs: xfs_vm_write_end truncates too much on failure

}

/*

 * On failure, we only need to kill delalloc blocks beyond EOF because they

 * will never be written. For blocks within EOF, generic_write_end() zeros them

 * so they are safe to leave alone and be written with all the other valid data.

 * On failure, we only need to kill delalloc blocks beyond EOF in the range of

 * this specific write because they will never be written. Previous writes

 * beyond EOF where block allocation succeeded do not need to be trashed, so

 * only new blocks from this write should be trashed. For blocks within

 * EOF, generic_write_end() zeros them so they are safe to leave alone and be

 * written with all the other valid data.

 */

STATIC int

xfs_vm_write_end(

		loff_t		to = pos + len;

		if (to > isize) {

			truncate_pagecache(inode, isize);

			/* only kill blocks in this write beyond EOF */

			if (pos > isize)

				isize = pos;

			xfs_vm_kill_delalloc_range(inode, isize, to);

			truncate_pagecache_range(inode, isize, to);

		}

	}

	return ret;