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Ryusuke Konishif183ff42009-04-06 19:01:33 -07001/*
2 * file.c - NILFS regular file handling primitives including fsync().
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
Ryusuke Konishi4b420ab2016-05-23 16:23:09 -070016 * Written by Amagai Yoshiji and Ryusuke Konishi.
Ryusuke Konishif183ff42009-04-06 19:01:33 -070017 */
18
19#include <linux/fs.h>
20#include <linux/mm.h>
21#include <linux/writeback.h>
22#include "nilfs.h"
23#include "segment.h"
24
Josef Bacik02c24a82011-07-16 20:44:56 -040025int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
Ryusuke Konishif183ff42009-04-06 19:01:33 -070026{
27 /*
28 * Called from fsync() system call
29 * This is the only entry point that can catch write and synch
30 * timing for both data blocks and intermediate blocks.
31 *
32 * This function should be implemented when the writeback function
33 * will be implemented.
34 */
Ryusuke Konishi11475972012-05-31 16:26:11 -070035 struct the_nilfs *nilfs;
Christoph Hellwig7ea80852010-05-26 17:53:25 +020036 struct inode *inode = file->f_mapping->host;
Andreas Rohner75dc8572014-12-10 15:54:29 -080037 int err = 0;
Josef Bacik02c24a82011-07-16 20:44:56 -040038
Ryusuke Konishi11475972012-05-31 16:26:11 -070039 if (nilfs_inode_dirty(inode)) {
40 if (datasync)
41 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
Andreas Rohner75dc8572014-12-10 15:54:29 -080042 start, end);
Ryusuke Konishi11475972012-05-31 16:26:11 -070043 else
44 err = nilfs_construct_segment(inode->i_sb);
Josef Bacik02c24a82011-07-16 20:44:56 -040045 }
Ryusuke Konishi11475972012-05-31 16:26:11 -070046
47 nilfs = inode->i_sb->s_fs_info;
Andreas Rohnere2c76172014-10-13 15:53:20 -070048 if (!err)
49 err = nilfs_flush_device(nilfs);
50
Ryusuke Konishif183ff42009-04-06 19:01:33 -070051 return err;
52}
53
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070054static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Ryusuke Konishif183ff42009-04-06 19:01:33 -070055{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070056 struct page *page = vmf->page;
Al Viro496ad9a2013-01-23 17:07:38 -050057 struct inode *inode = file_inode(vma->vm_file);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070058 struct nilfs_transaction_info ti;
Jan Kara2c22b332012-06-12 16:20:44 +020059 int ret = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070060
Ryusuke Konishie3154e92011-03-09 11:05:08 +090061 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070062 return VM_FAULT_SIGBUS; /* -ENOSPC */
63
Jan Kara2c22b332012-06-12 16:20:44 +020064 sb_start_pagefault(inode->i_sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070065 lock_page(page);
66 if (page->mapping != inode->i_mapping ||
67 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
68 unlock_page(page);
Jan Kara2c22b332012-06-12 16:20:44 +020069 ret = -EFAULT; /* make the VM retry the fault */
70 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070071 }
72
73 /*
74 * check to see if the page is mapped already (no holes)
75 */
Ryusuke Konishi34094532011-03-27 22:50:49 +090076 if (PageMappedToDisk(page))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070077 goto mapped;
Ryusuke Konishi34094532011-03-27 22:50:49 +090078
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070079 if (page_has_buffers(page)) {
80 struct buffer_head *bh, *head;
81 int fully_mapped = 1;
82
83 bh = head = page_buffers(page);
84 do {
85 if (!buffer_mapped(bh)) {
86 fully_mapped = 0;
87 break;
88 }
89 } while (bh = bh->b_this_page, bh != head);
90
91 if (fully_mapped) {
92 SetPageMappedToDisk(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070093 goto mapped;
94 }
95 }
96 unlock_page(page);
97
98 /*
99 * fill hole blocks
100 */
101 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
102 /* never returns -ENOMEM, but may return -ENOSPC */
103 if (unlikely(ret))
Jan Kara2c22b332012-06-12 16:20:44 +0200104 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700105
Theodore Ts'o041bbb6d2012-09-30 23:04:56 -0400106 file_update_time(vma->vm_file);
Ross Zwisler5c500022015-10-13 16:51:02 -0600107 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
Jan Kara2c22b332012-06-12 16:20:44 +0200108 if (ret) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700109 nilfs_transaction_abort(inode->i_sb);
Jan Kara2c22b332012-06-12 16:20:44 +0200110 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700111 }
Ryusuke Konishi34094532011-03-27 22:50:49 +0900112 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700113 nilfs_transaction_commit(inode->i_sb);
114
115 mapped:
Darrick J. Wong1d1d1a72013-02-21 16:42:51 -0800116 wait_for_stable_page(page);
Jan Kara2c22b332012-06-12 16:20:44 +0200117 out:
118 sb_end_pagefault(inode->i_sb);
119 return block_page_mkwrite_return(ret);
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700120}
121
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400122static const struct vm_operations_struct nilfs_file_vm_ops = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700123 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700124 .map_pages = filemap_map_pages,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700125 .page_mkwrite = nilfs_page_mkwrite,
126};
127
128static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
129{
130 file_accessed(file);
131 vma->vm_ops = &nilfs_file_vm_ops;
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700132 return 0;
133}
134
135/*
136 * We have mostly NULL's here: the current defaults are ok for
137 * the nilfs filesystem.
138 */
Alexey Dobriyan828c0952009-10-01 15:43:56 -0700139const struct file_operations nilfs_file_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700140 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400141 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400142 .write_iter = generic_file_write_iter,
Ryusuke Konishi7a946192009-04-06 19:01:53 -0700143 .unlocked_ioctl = nilfs_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700144#ifdef CONFIG_COMPAT
Ryusuke Konishi828b1c52011-02-03 21:26:17 +0900145 .compat_ioctl = nilfs_compat_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700146#endif /* CONFIG_COMPAT */
147 .mmap = nilfs_file_mmap,
148 .open = generic_file_open,
149 /* .release = nilfs_release_file, */
150 .fsync = nilfs_sync_file,
151 .splice_read = generic_file_splice_read,
152};
153
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700154const struct inode_operations nilfs_file_inode_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700155 .setattr = nilfs_setattr,
156 .permission = nilfs_permission,
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900157 .fiemap = nilfs_fiemap,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700158};
159
160/* end of file */