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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;
Ryusuke Konishif183ff42009-04-06 19:01:33 -070042 int err;
43
Josef Bacik02c24a82011-07-16 20:44:56 -040044 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
45 if (err)
46 return err;
47 mutex_lock(&inode->i_mutex);
48
Ryusuke Konishi11475972012-05-31 16:26:11 -070049 if (nilfs_inode_dirty(inode)) {
50 if (datasync)
51 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
52 0, LLONG_MAX);
53 else
54 err = nilfs_construct_segment(inode->i_sb);
Josef Bacik02c24a82011-07-16 20:44:56 -040055 }
Josef Bacik02c24a82011-07-16 20:44:56 -040056 mutex_unlock(&inode->i_mutex);
Ryusuke Konishi11475972012-05-31 16:26:11 -070057
58 nilfs = inode->i_sb->s_fs_info;
59 if (!err && nilfs_test_opt(nilfs, BARRIER)) {
60 err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
61 if (err != -EIO)
62 err = 0;
63 }
Ryusuke Konishif183ff42009-04-06 19:01:33 -070064 return err;
65}
66
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070067static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Ryusuke Konishif183ff42009-04-06 19:01:33 -070068{
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070069 struct page *page = vmf->page;
Al Viro496ad9a2013-01-23 17:07:38 -050070 struct inode *inode = file_inode(vma->vm_file);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070071 struct nilfs_transaction_info ti;
Jan Kara2c22b332012-06-12 16:20:44 +020072 int ret = 0;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070073
Ryusuke Konishie3154e92011-03-09 11:05:08 +090074 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070075 return VM_FAULT_SIGBUS; /* -ENOSPC */
76
Jan Kara2c22b332012-06-12 16:20:44 +020077 sb_start_pagefault(inode->i_sb);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070078 lock_page(page);
79 if (page->mapping != inode->i_mapping ||
80 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
81 unlock_page(page);
Jan Kara2c22b332012-06-12 16:20:44 +020082 ret = -EFAULT; /* make the VM retry the fault */
83 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070084 }
85
86 /*
87 * check to see if the page is mapped already (no holes)
88 */
Ryusuke Konishi34094532011-03-27 22:50:49 +090089 if (PageMappedToDisk(page))
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070090 goto mapped;
Ryusuke Konishi34094532011-03-27 22:50:49 +090091
Ryusuke Konishi9ff051232009-04-06 19:01:37 -070092 if (page_has_buffers(page)) {
93 struct buffer_head *bh, *head;
94 int fully_mapped = 1;
95
96 bh = head = page_buffers(page);
97 do {
98 if (!buffer_mapped(bh)) {
99 fully_mapped = 0;
100 break;
101 }
102 } while (bh = bh->b_this_page, bh != head);
103
104 if (fully_mapped) {
105 SetPageMappedToDisk(page);
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700106 goto mapped;
107 }
108 }
109 unlock_page(page);
110
111 /*
112 * fill hole blocks
113 */
114 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
115 /* never returns -ENOMEM, but may return -ENOSPC */
116 if (unlikely(ret))
Jan Kara2c22b332012-06-12 16:20:44 +0200117 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700118
Theodore Ts'o041bbb6d2012-09-30 23:04:56 -0400119 file_update_time(vma->vm_file);
Jan Kara2c22b332012-06-12 16:20:44 +0200120 ret = __block_page_mkwrite(vma, vmf, nilfs_get_block);
121 if (ret) {
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700122 nilfs_transaction_abort(inode->i_sb);
Jan Kara2c22b332012-06-12 16:20:44 +0200123 goto out;
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700124 }
Ryusuke Konishi34094532011-03-27 22:50:49 +0900125 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
Ryusuke Konishi9ff051232009-04-06 19:01:37 -0700126 nilfs_transaction_commit(inode->i_sb);
127
128 mapped:
Darrick J. Wong1d1d1a72013-02-21 16:42:51 -0800129 wait_for_stable_page(page);
Jan Kara2c22b332012-06-12 16:20:44 +0200130 out:
131 sb_end_pagefault(inode->i_sb);
132 return block_page_mkwrite_return(ret);
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700133}
134
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400135static const struct vm_operations_struct nilfs_file_vm_ops = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700136 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700137 .map_pages = filemap_map_pages,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700138 .page_mkwrite = nilfs_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -0700139 .remap_pages = generic_file_remap_pages,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700140};
141
142static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
143{
144 file_accessed(file);
145 vma->vm_ops = &nilfs_file_vm_ops;
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700146 return 0;
147}
148
149/*
150 * We have mostly NULL's here: the current defaults are ok for
151 * the nilfs filesystem.
152 */
Alexey Dobriyan828c0952009-10-01 15:43:56 -0700153const struct file_operations nilfs_file_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700154 .llseek = generic_file_llseek,
155 .read = do_sync_read,
156 .write = do_sync_write,
157 .aio_read = generic_file_aio_read,
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700158 .aio_write = generic_file_aio_write,
Ryusuke Konishi7a946192009-04-06 19:01:53 -0700159 .unlocked_ioctl = nilfs_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700160#ifdef CONFIG_COMPAT
Ryusuke Konishi828b1c52011-02-03 21:26:17 +0900161 .compat_ioctl = nilfs_compat_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700162#endif /* CONFIG_COMPAT */
163 .mmap = nilfs_file_mmap,
164 .open = generic_file_open,
165 /* .release = nilfs_release_file, */
166 .fsync = nilfs_sync_file,
167 .splice_read = generic_file_splice_read,
168};
169
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700170const struct inode_operations nilfs_file_inode_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700171 .setattr = nilfs_setattr,
172 .permission = nilfs_permission,
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900173 .fiemap = nilfs_fiemap,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700174};
175
176/* end of file */