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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS regular file handling primitives including fsync().
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Amagai Yoshiji and Ryusuke Konishi.
8 */
9
10#include <linux/fs.h>
11#include <linux/mm.h>
12#include <linux/writeback.h>
13#include "nilfs.h"
14#include "segment.h"
15
16int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
17{
18 /*
19 * Called from fsync() system call
20 * This is the only entry point that can catch write and synch
21 * timing for both data blocks and intermediate blocks.
22 *
23 * This function should be implemented when the writeback function
24 * will be implemented.
25 */
26 struct the_nilfs *nilfs;
27 struct inode *inode = file->f_mapping->host;
28 int err = 0;
29
30 if (nilfs_inode_dirty(inode)) {
31 if (datasync)
32 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
33 start, end);
34 else
35 err = nilfs_construct_segment(inode->i_sb);
36 }
37
38 nilfs = inode->i_sb->s_fs_info;
39 if (!err)
40 err = nilfs_flush_device(nilfs);
41
42 return err;
43}
44
45static vm_fault_t nilfs_page_mkwrite(struct vm_fault *vmf)
46{
47 struct vm_area_struct *vma = vmf->vma;
48 struct page *page = vmf->page;
49 struct inode *inode = file_inode(vma->vm_file);
50 struct nilfs_transaction_info ti;
51 int ret = 0;
52
53 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
54 return VM_FAULT_SIGBUS; /* -ENOSPC */
55
56 sb_start_pagefault(inode->i_sb);
57 lock_page(page);
58 if (page->mapping != inode->i_mapping ||
59 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
60 unlock_page(page);
61 ret = -EFAULT; /* make the VM retry the fault */
62 goto out;
63 }
64
65 /*
66 * check to see if the page is mapped already (no holes)
67 */
68 if (PageMappedToDisk(page))
69 goto mapped;
70
71 if (page_has_buffers(page)) {
72 struct buffer_head *bh, *head;
73 int fully_mapped = 1;
74
75 bh = head = page_buffers(page);
76 do {
77 if (!buffer_mapped(bh)) {
78 fully_mapped = 0;
79 break;
80 }
81 } while (bh = bh->b_this_page, bh != head);
82
83 if (fully_mapped) {
84 SetPageMappedToDisk(page);
85 goto mapped;
86 }
87 }
88 unlock_page(page);
89
90 /*
91 * fill hole blocks
92 */
93 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
94 /* never returns -ENOMEM, but may return -ENOSPC */
95 if (unlikely(ret))
96 goto out;
97
98 file_update_time(vma->vm_file);
99 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
100 if (ret) {
101 nilfs_transaction_abort(inode->i_sb);
102 goto out;
103 }
104 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
105 nilfs_transaction_commit(inode->i_sb);
106
107 mapped:
108 wait_for_stable_page(page);
109 out:
110 sb_end_pagefault(inode->i_sb);
111 return block_page_mkwrite_return(ret);
112}
113
114static const struct vm_operations_struct nilfs_file_vm_ops = {
115 .fault = filemap_fault,
116 .map_pages = filemap_map_pages,
117 .page_mkwrite = nilfs_page_mkwrite,
118};
119
120static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
121{
122 file_accessed(file);
123 vma->vm_ops = &nilfs_file_vm_ops;
124 return 0;
125}
126
127/*
128 * We have mostly NULL's here: the current defaults are ok for
129 * the nilfs filesystem.
130 */
131const struct file_operations nilfs_file_operations = {
132 .llseek = generic_file_llseek,
133 .read_iter = generic_file_read_iter,
134 .write_iter = generic_file_write_iter,
135 .unlocked_ioctl = nilfs_ioctl,
136#ifdef CONFIG_COMPAT
137 .compat_ioctl = nilfs_compat_ioctl,
138#endif /* CONFIG_COMPAT */
139 .mmap = nilfs_file_mmap,
140 .open = generic_file_open,
141 /* .release = nilfs_release_file, */
142 .fsync = nilfs_sync_file,
143 .splice_read = generic_file_splice_read,
144 .splice_write = iter_file_splice_write,
145};
146
147const struct inode_operations nilfs_file_inode_operations = {
148 .setattr = nilfs_setattr,
149 .permission = nilfs_permission,
150 .fiemap = nilfs_fiemap,
151 .fileattr_get = nilfs_fileattr_get,
152 .fileattr_set = nilfs_fileattr_set,
153};
154
155/* end of file */
1/*
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
30int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
31{
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 */
40 struct the_nilfs *nilfs;
41 struct inode *inode = file->f_mapping->host;
42 int err;
43
44 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
45 if (err)
46 return err;
47 mutex_lock(&inode->i_mutex);
48
49 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);
55 }
56 mutex_unlock(&inode->i_mutex);
57
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 }
64 return err;
65}
66
67static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
68{
69 struct page *page = vmf->page;
70 struct inode *inode = vma->vm_file->f_dentry->d_inode;
71 struct nilfs_transaction_info ti;
72 int ret;
73
74 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
75 return VM_FAULT_SIGBUS; /* -ENOSPC */
76
77 lock_page(page);
78 if (page->mapping != inode->i_mapping ||
79 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
80 unlock_page(page);
81 return VM_FAULT_NOPAGE; /* make the VM retry the fault */
82 }
83
84 /*
85 * check to see if the page is mapped already (no holes)
86 */
87 if (PageMappedToDisk(page))
88 goto mapped;
89
90 if (page_has_buffers(page)) {
91 struct buffer_head *bh, *head;
92 int fully_mapped = 1;
93
94 bh = head = page_buffers(page);
95 do {
96 if (!buffer_mapped(bh)) {
97 fully_mapped = 0;
98 break;
99 }
100 } while (bh = bh->b_this_page, bh != head);
101
102 if (fully_mapped) {
103 SetPageMappedToDisk(page);
104 goto mapped;
105 }
106 }
107 unlock_page(page);
108
109 /*
110 * fill hole blocks
111 */
112 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
113 /* never returns -ENOMEM, but may return -ENOSPC */
114 if (unlikely(ret))
115 return VM_FAULT_SIGBUS;
116
117 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
118 if (ret != VM_FAULT_LOCKED) {
119 nilfs_transaction_abort(inode->i_sb);
120 return ret;
121 }
122 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
123 nilfs_transaction_commit(inode->i_sb);
124
125 mapped:
126 wait_on_page_writeback(page);
127 return VM_FAULT_LOCKED;
128}
129
130static const struct vm_operations_struct nilfs_file_vm_ops = {
131 .fault = filemap_fault,
132 .page_mkwrite = nilfs_page_mkwrite,
133};
134
135static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
136{
137 file_accessed(file);
138 vma->vm_ops = &nilfs_file_vm_ops;
139 vma->vm_flags |= VM_CAN_NONLINEAR;
140 return 0;
141}
142
143/*
144 * We have mostly NULL's here: the current defaults are ok for
145 * the nilfs filesystem.
146 */
147const struct file_operations nilfs_file_operations = {
148 .llseek = generic_file_llseek,
149 .read = do_sync_read,
150 .write = do_sync_write,
151 .aio_read = generic_file_aio_read,
152 .aio_write = generic_file_aio_write,
153 .unlocked_ioctl = nilfs_ioctl,
154#ifdef CONFIG_COMPAT
155 .compat_ioctl = nilfs_compat_ioctl,
156#endif /* CONFIG_COMPAT */
157 .mmap = nilfs_file_mmap,
158 .open = generic_file_open,
159 /* .release = nilfs_release_file, */
160 .fsync = nilfs_sync_file,
161 .splice_read = generic_file_splice_read,
162};
163
164const struct inode_operations nilfs_file_inode_operations = {
165 .truncate = nilfs_truncate,
166 .setattr = nilfs_setattr,
167 .permission = nilfs_permission,
168 .fiemap = nilfs_fiemap,
169};
170
171/* end of file */