| /* |
| * 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@osrg.net>, |
| * Ryusuke Konishi <ryusuke@osrg.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 */ |