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Date: Mon, 15 Sep 2008 04:08:13 +0900
From: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Subject: [PATCH 16/27] nilfs2: file operations
This adds primitives for regular file handling.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
---
fs/nilfs2/file.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 125 insertions(+), 0 deletions(-)
create mode 100644 fs/nilfs2/file.c
diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
new file mode 100644
index 0000000..7ddd42e
--- /dev/null
+++ b/fs/nilfs2/file.c
@@ -0,0 +1,125 @@
+/*
+ * file.c - NILFS regular file handling primitives including fsync().
+ *
+ * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Amagai Yoshiji <amagai@...g.net>,
+ * Ryusuke Konishi <ryusuke@...g.net>
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/writeback.h>
+#include "nilfs.h"
+#include "segment.h"
+
+int nilfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
+{
+ /*
+ * Called from fsync() system call
+ * This is the only entry point that can catch write and synch
+ * timing for both data blocks and intermediate blocks.
+ *
+ * This function should be implemented when the writeback function
+ * will be implemented.
+ */
+ struct inode *inode = dentry->d_inode;
+ int err;
+
+ if (!nilfs_inode_dirty(inode))
+ return 0;
+
+ if (datasync)
+ err = nilfs_construct_dsync_segment(inode->i_sb, inode);
+ else
+ err = nilfs_construct_segment(inode->i_sb);
+
+ return err;
+}
+
+static ssize_t
+nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_dentry->d_inode;
+ ssize_t ret;
+
+ ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
+ if (ret <= 0)
+ return ret;
+
+ if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
+ int err;
+
+ err = nilfs_construct_dsync_segment(inode->i_sb, inode);
+ if (unlikely(err))
+ return err;
+ }
+ return ret;
+}
+
+static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+ if (!(vma->vm_flags & (VM_WRITE | VM_MAYWRITE)))
+ return -EPERM;
+ SetPageChecked(page);
+ wait_on_page_writeback(page);
+ return 0;
+}
+
+struct vm_operations_struct nilfs_file_vm_ops = {
+ .fault = filemap_fault,
+ .page_mkwrite = nilfs_page_mkwrite,
+};
+
+static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ file_accessed(file);
+ vma->vm_ops = &nilfs_file_vm_ops;
+ vma->vm_flags |= VM_CAN_NONLINEAR;
+ return 0;
+}
+
+/*
+ * We have mostly NULL's here: the current defaults are ok for
+ * the nilfs filesystem.
+ */
+struct file_operations nilfs_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .aio_read = generic_file_aio_read,
+ .aio_write = nilfs_file_aio_write,
+ .ioctl = nilfs_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = nilfs_compat_ioctl,
+#endif /* CONFIG_COMPAT */
+ .mmap = nilfs_file_mmap,
+ .open = generic_file_open,
+ /* .release = nilfs_release_file, */
+ .fsync = nilfs_sync_file,
+ .splice_read = generic_file_splice_read,
+};
+
+struct inode_operations nilfs_file_inode_operations = {
+ .truncate = nilfs_truncate,
+ .setattr = nilfs_setattr,
+ .permission = nilfs_permission,
+};
+
+/* end of file */
--
1.5.6.3
--
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