blob: 26601529dc17c7ff9f5bc7d4c249a59371cd14c4 [file] [log] [blame]
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 */
Christoph Hellwig7ea80852010-05-26 17:53:25 +020040 struct inode *inode = file->f_mapping->host;
Ryusuke Konishif183ff42009-04-06 19:01:33 -070041 int err;
42
Josef Bacik02c24a82011-07-16 20:44:56 -040043 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
44 if (err)
45 return err;
46 mutex_lock(&inode->i_mutex);
47
48 if (!nilfs_inode_dirty(inode)) {
49 mutex_unlock(&inode->i_mutex);
Ryusuke Konishif183ff42009-04-06 19:01:33 -070050 return 0;
Josef Bacik02c24a82011-07-16 20:44:56 -040051 }
Ryusuke Konishif183ff42009-04-06 19:01:33 -070052
53 if (datasync)
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -070054 err = nilfs_construct_dsync_segment(inode->i_sb, inode, 0,
55 LLONG_MAX);
Ryusuke Konishif183ff42009-04-06 19:01:33 -070056 else
57 err = nilfs_construct_segment(inode->i_sb);
58
Josef Bacik02c24a82011-07-16 20:44:56 -040059 mutex_unlock(&inode->i_mutex);
Ryusuke Konishif183ff42009-04-06 19:01:33 -070060 return err;
61}
62
Ryusuke Konishi9ff05122009-04-06 19:01:37 -070063static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Ryusuke Konishif183ff42009-04-06 19:01:33 -070064{
Ryusuke Konishi9ff05122009-04-06 19:01:37 -070065 struct page *page = vmf->page;
66 struct inode *inode = vma->vm_file->f_dentry->d_inode;
67 struct nilfs_transaction_info ti;
68 int ret;
69
Ryusuke Konishie3154e92011-03-09 11:05:08 +090070 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
Ryusuke Konishi9ff05122009-04-06 19:01:37 -070071 return VM_FAULT_SIGBUS; /* -ENOSPC */
72
73 lock_page(page);
74 if (page->mapping != inode->i_mapping ||
75 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
76 unlock_page(page);
77 return VM_FAULT_NOPAGE; /* make the VM retry the fault */
78 }
79
80 /*
81 * check to see if the page is mapped already (no holes)
82 */
Ryusuke Konishi34094532011-03-27 22:50:49 +090083 if (PageMappedToDisk(page))
Ryusuke Konishi9ff05122009-04-06 19:01:37 -070084 goto mapped;
Ryusuke Konishi34094532011-03-27 22:50:49 +090085
Ryusuke Konishi9ff05122009-04-06 19:01:37 -070086 if (page_has_buffers(page)) {
87 struct buffer_head *bh, *head;
88 int fully_mapped = 1;
89
90 bh = head = page_buffers(page);
91 do {
92 if (!buffer_mapped(bh)) {
93 fully_mapped = 0;
94 break;
95 }
96 } while (bh = bh->b_this_page, bh != head);
97
98 if (fully_mapped) {
99 SetPageMappedToDisk(page);
Ryusuke Konishi9ff05122009-04-06 19:01:37 -0700100 goto mapped;
101 }
102 }
103 unlock_page(page);
104
105 /*
106 * fill hole blocks
107 */
108 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
109 /* never returns -ENOMEM, but may return -ENOSPC */
110 if (unlikely(ret))
111 return VM_FAULT_SIGBUS;
112
113 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
Ryusuke Konishi34094532011-03-27 22:50:49 +0900114 if (ret != VM_FAULT_LOCKED) {
Ryusuke Konishi9ff05122009-04-06 19:01:37 -0700115 nilfs_transaction_abort(inode->i_sb);
116 return ret;
117 }
Ryusuke Konishi34094532011-03-27 22:50:49 +0900118 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
Ryusuke Konishi9ff05122009-04-06 19:01:37 -0700119 nilfs_transaction_commit(inode->i_sb);
120
121 mapped:
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700122 wait_on_page_writeback(page);
Ryusuke Konishi34094532011-03-27 22:50:49 +0900123 return VM_FAULT_LOCKED;
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700124}
125
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400126static const struct vm_operations_struct nilfs_file_vm_ops = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700127 .fault = filemap_fault,
128 .page_mkwrite = nilfs_page_mkwrite,
129};
130
131static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
132{
133 file_accessed(file);
134 vma->vm_ops = &nilfs_file_vm_ops;
135 vma->vm_flags |= VM_CAN_NONLINEAR;
136 return 0;
137}
138
139/*
140 * We have mostly NULL's here: the current defaults are ok for
141 * the nilfs filesystem.
142 */
Alexey Dobriyan828c0952009-10-01 15:43:56 -0700143const struct file_operations nilfs_file_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700144 .llseek = generic_file_llseek,
145 .read = do_sync_read,
146 .write = do_sync_write,
147 .aio_read = generic_file_aio_read,
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700148 .aio_write = generic_file_aio_write,
Ryusuke Konishi7a946192009-04-06 19:01:53 -0700149 .unlocked_ioctl = nilfs_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700150#ifdef CONFIG_COMPAT
Ryusuke Konishi828b1c52011-02-03 21:26:17 +0900151 .compat_ioctl = nilfs_compat_ioctl,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700152#endif /* CONFIG_COMPAT */
153 .mmap = nilfs_file_mmap,
154 .open = generic_file_open,
155 /* .release = nilfs_release_file, */
156 .fsync = nilfs_sync_file,
157 .splice_read = generic_file_splice_read,
158};
159
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700160const struct inode_operations nilfs_file_inode_operations = {
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700161 .truncate = nilfs_truncate,
162 .setattr = nilfs_setattr,
163 .permission = nilfs_permission,
Ryusuke Konishi622daaf2010-12-26 16:38:43 +0900164 .fiemap = nilfs_fiemap,
Ryusuke Konishif183ff42009-04-06 19:01:33 -0700165};
166
167/* end of file */