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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 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Amagai Yoshiji <amagai@osrg.net>,
21 * Ryusuke Konishi <ryusuke@osrg.net>
22 */
23
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/writeback.h>
27#include "nilfs.h"
28#include "segment.h"
29
Josef Bacik02c24a82011-07-16 20:44:56 -040030int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
Ryusuke Konishif183ff42009-04-06 19:01:33 -070031{
32 /*
33 * Called from fsync() system call
34 * This is the only entry point that can catch write and synch
35 * timing for both data blocks and intermediate blocks.
36 *
37 * This function should be implemented when the writeback function
38 * will be implemented.
39 */
Ryusuke Konishi11475972012-05-31 16:26:11 -070040 struct the_nilfs *nilfs;
Christoph Hellwig7ea80852010-05-26 17:53:25 +020041 struct inode *inode = file->f_mapping->host;
Andreas Rohner75dc8572014-12-10 15:54:29 -080042 int err = 0;
Josef Bacik02c24a82011-07-16 20:44:56 -040043
Ryusuke Konishi11475972012-05-31 16:26:11 -070044 if (nilfs_inode_dirty(inode)) {
45 if (datasync)
46 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
Andreas Rohner75dc8572014-12-10 15:54:29 -080047 start, end);
Ryusuke Konishi11475972012-05-31 16:26:11 -070048 else
49 err = nilfs_construct_segment(inode->i_sb);
Josef Bacik02c24a82011-07-16 20:44:56 -040050 }
Ryusuke Konishi11475972012-05-31 16:26:11 -070051
52 nilfs = inode->i_sb->s_fs_info;
Andreas Rohnere2c76172014-10-13 15:53:20 -070053 if (!err)
54 err = nilfs_flush_device(nilfs);
55
Ryusuke Konishif183ff42009-04-06 19:01:33 -070056 return err;
57}
58
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070059static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Ryusuke Konishif183ff42009-04-06 19:01:33 -070060{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070061 struct page *page = vmf->page;
Al Viro496ad9a2013-01-23 17:07:38 -050062 struct inode *inode = file_inode(vma->vm_file);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070063 struct nilfs_transaction_info ti;
Jan Kara2c22b332012-06-12 16:20:44 +020064 int ret = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070065
Ryusuke Konishie3154e92011-03-09 11:05:08 +090066 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070067 return VM_FAULT_SIGBUS; /* -ENOSPC */
68
Jan Kara2c22b332012-06-12 16:20:44 +020069 sb_start_pagefault(inode->i_sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070070 lock_page(page);
71 if (page->mapping != inode->i_mapping ||
72 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
73 unlock_page(page);
Jan Kara2c22b332012-06-12 16:20:44 +020074 ret = -EFAULT; /* make the VM retry the fault */
75 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070076 }
77
78 /*
79 * check to see if the page is mapped already (no holes)
80 */
Ryusuke Konishi34094532011-03-27 22:50:49 +090081 if (PageMappedToDisk(page))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070082 goto mapped;
Ryusuke Konishi34094532011-03-27 22:50:49 +090083
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070084 if (page_has_buffers(page)) {
85 struct buffer_head *bh, *head;
86 int fully_mapped = 1;
87
88 bh = head = page_buffers(page);
89 do {
90 if (!buffer_mapped(bh)) {
91 fully_mapped = 0;
92 break;
93 }
94 } while (bh = bh->b_this_page, bh != head);
95
96 if (fully_mapped) {
97 SetPageMappedToDisk(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070098 goto mapped;
99 }
100 }
101 unlock_page(page);
102
103 /*
104 * fill hole blocks
105 */
106 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
107 /* never returns -ENOMEM, but may return -ENOSPC */
108 if (unlikely(ret))
Jan Kara2c22b332012-06-12 16:20:44 +0200109 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700110
Theodore Ts'o041bbb6d2012-09-30 23:04:56 -0400111 file_update_time(vma->vm_file);
Jan Kara2c22b332012-06-12 16:20:44 +0200112 ret = __block_page_mkwrite(vma, vmf, nilfs_get_block);
113 if (ret) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700114 nilfs_transaction_abort(inode->i_sb);
Jan Kara2c22b332012-06-12 16:20:44 +0200115 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700116 }
Ryusuke Konishi34094532011-03-27 22:50:49 +0900117 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700118 nilfs_transaction_commit(inode->i_sb);
119
120 mapped:
Darrick J. Wong1d1d1a72013-02-21 16:42:51 -0800121 wait_for_stable_page(page);
Jan Kara2c22b332012-06-12 16:20:44 +0200122 out:
123 sb_end_pagefault(inode->i_sb);
124 return block_page_mkwrite_return(ret);
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700125}
126
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400127static const struct vm_operations_struct nilfs_file_vm_ops = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700128 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700129 .map_pages = filemap_map_pages,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700130 .page_mkwrite = nilfs_page_mkwrite,
131};
132
133static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
134{
135 file_accessed(file);
136 vma->vm_ops = &nilfs_file_vm_ops;
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700137 return 0;
138}
139
140/*
141 * We have mostly NULL's here: the current defaults are ok for
142 * the nilfs filesystem.
143 */
Alexey Dobriyan828c0952009-10-01 15:43:56 -0700144const struct file_operations nilfs_file_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700145 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400146 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400147 .write_iter = generic_file_write_iter,
Ryusuke Konishi7a946192009-04-06 19:01:53 -0700148 .unlocked_ioctl = nilfs_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700149#ifdef CONFIG_COMPAT
Ryusuke Konishi828b1c52011-02-03 21:26:17 +0900150 .compat_ioctl = nilfs_compat_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700151#endif /* CONFIG_COMPAT */
152 .mmap = nilfs_file_mmap,
153 .open = generic_file_open,
154 /* .release = nilfs_release_file, */
155 .fsync = nilfs_sync_file,
156 .splice_read = generic_file_splice_read,
157};
158
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700159const struct inode_operations nilfs_file_inode_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700160 .setattr = nilfs_setattr,
161 .permission = nilfs_permission,
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900162 .fiemap = nilfs_fiemap,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700163};
164
165/* end of file */