--- /dev/null 2007-03-13 19:15:28.862769062 +0100
+++ linux-2.6.21logfs/fs/logfs/file.c 2007-06-03 19:55:14.000000000 +0200
@@ -0,0 +1,75 @@
+/*
+ * fs/logfs/file.c - prepare_write, commit_write and friends
+ *
+ * As should be obvious for Linux kernel code, license is GPLv2
+ *
+ * Copyright (c) 2005-2007 Joern Engel
+ */
+#include "logfs.h"
+
+static int logfs_prepare_write(struct file *file, struct page *page,
+ unsigned start, unsigned end)
+{
+ if (PageUptodate(page))
+ return 0;
+
+ if ((start == 0) && (end == PAGE_CACHE_SIZE))
+ return 0;
+
+ return logfs_readpage_nolock(page);
+}
+
+static int logfs_commit_write(struct file *file, struct page *page,
+ unsigned start, unsigned end)
+{
+ struct inode *inode = page->mapping->host;
+ pgoff_t index = page->index;
+ void *buf;
+ int ret;
+
+ BUG_ON(PAGE_CACHE_SIZE != inode->i_sb->s_blocksize);
+ BUG_ON(page->index > I3_BLOCKS);
+
+ if (start == end)
+ return 0; /* FIXME: do we need to update inode? */
+
+ if (i_size_read(inode) < (index << PAGE_CACHE_SHIFT) + end) {
+ i_size_write(inode, (index << PAGE_CACHE_SHIFT) + end);
+ mark_inode_dirty_sync(inode);
+ }
+
+ buf = kmap(page);
+ ret = logfs_write_buf(inode, index, buf);
+ kunmap(page);
+ return ret;
+}
+
+static int logfs_readpage(struct file *file, struct page *page)
+{
+ int ret;
+
+ ret = logfs_readpage_nolock(page);
+ unlock_page(page);
+ return ret;
+}
+
+const struct inode_operations logfs_reg_iops = {
+ .truncate = logfs_truncate,
+};
+
+const struct file_operations logfs_reg_fops = {
+ .aio_read = generic_file_aio_read,
+ .aio_write = generic_file_aio_write,
+ .llseek = generic_file_llseek,
+ .mmap = generic_file_readonly_mmap,
+ .open = generic_file_open,
+ .read = do_sync_read,
+ .write = do_sync_write,
+};
+
+const struct address_space_operations logfs_reg_aops = {
+ .commit_write = logfs_commit_write,
+ .prepare_write = logfs_prepare_write,
+ .readpage = logfs_readpage,
+ .set_page_dirty = __set_page_dirty_nobuffers,
+};
-
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