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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 folio *folio = page_folio(vmf->page);
49 struct inode *inode = file_inode(vma->vm_file);
50 struct nilfs_transaction_info ti;
51 struct buffer_head *bh, *head;
52 int ret = 0;
53
54 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
55 return VM_FAULT_SIGBUS; /* -ENOSPC */
56
57 sb_start_pagefault(inode->i_sb);
58 folio_lock(folio);
59 if (folio->mapping != inode->i_mapping ||
60 folio_pos(folio) >= i_size_read(inode) ||
61 !folio_test_uptodate(folio)) {
62 folio_unlock(folio);
63 ret = -EFAULT; /* make the VM retry the fault */
64 goto out;
65 }
66
67 /*
68 * check to see if the folio is mapped already (no holes)
69 */
70 if (folio_test_mappedtodisk(folio))
71 goto mapped;
72
73 head = folio_buffers(folio);
74 if (head) {
75 int fully_mapped = 1;
76
77 bh = head;
78 do {
79 if (!buffer_mapped(bh)) {
80 fully_mapped = 0;
81 break;
82 }
83 } while (bh = bh->b_this_page, bh != head);
84
85 if (fully_mapped) {
86 folio_set_mappedtodisk(folio);
87 goto mapped;
88 }
89 }
90 folio_unlock(folio);
91
92 /*
93 * fill hole blocks
94 */
95 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
96 /* never returns -ENOMEM, but may return -ENOSPC */
97 if (unlikely(ret))
98 goto out;
99
100 file_update_time(vma->vm_file);
101 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
102 if (ret) {
103 nilfs_transaction_abort(inode->i_sb);
104 goto out;
105 }
106 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
107 nilfs_transaction_commit(inode->i_sb);
108
109 mapped:
110 /*
111 * Since checksumming including data blocks is performed to determine
112 * the validity of the log to be written and used for recovery, it is
113 * necessary to wait for writeback to finish here, regardless of the
114 * stable write requirement of the backing device.
115 */
116 folio_wait_writeback(folio);
117 out:
118 sb_end_pagefault(inode->i_sb);
119 return vmf_fs_error(ret);
120}
121
122static const struct vm_operations_struct nilfs_file_vm_ops = {
123 .fault = filemap_fault,
124 .map_pages = filemap_map_pages,
125 .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;
132 return 0;
133}
134
135/*
136 * We have mostly NULL's here: the current defaults are ok for
137 * the nilfs filesystem.
138 */
139const struct file_operations nilfs_file_operations = {
140 .llseek = generic_file_llseek,
141 .read_iter = generic_file_read_iter,
142 .write_iter = generic_file_write_iter,
143 .unlocked_ioctl = nilfs_ioctl,
144#ifdef CONFIG_COMPAT
145 .compat_ioctl = nilfs_compat_ioctl,
146#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 = filemap_splice_read,
152 .splice_write = iter_file_splice_write,
153};
154
155const struct inode_operations nilfs_file_inode_operations = {
156 .setattr = nilfs_setattr,
157 .permission = nilfs_permission,
158 .fiemap = nilfs_fiemap,
159 .fileattr_get = nilfs_fileattr_get,
160 .fileattr_set = nilfs_fileattr_set,
161};
162
163/* 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 = file_inode(vma->vm_file);
71 struct nilfs_transaction_info ti;
72 int ret = 0;
73
74 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
75 return VM_FAULT_SIGBUS; /* -ENOSPC */
76
77 sb_start_pagefault(inode->i_sb);
78 lock_page(page);
79 if (page->mapping != inode->i_mapping ||
80 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
81 unlock_page(page);
82 ret = -EFAULT; /* make the VM retry the fault */
83 goto out;
84 }
85
86 /*
87 * check to see if the page is mapped already (no holes)
88 */
89 if (PageMappedToDisk(page))
90 goto mapped;
91
92 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);
106 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))
117 goto out;
118
119 file_update_time(vma->vm_file);
120 ret = __block_page_mkwrite(vma, vmf, nilfs_get_block);
121 if (ret) {
122 nilfs_transaction_abort(inode->i_sb);
123 goto out;
124 }
125 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
126 nilfs_transaction_commit(inode->i_sb);
127
128 mapped:
129 wait_for_stable_page(page);
130 out:
131 sb_end_pagefault(inode->i_sb);
132 return block_page_mkwrite_return(ret);
133}
134
135static const struct vm_operations_struct nilfs_file_vm_ops = {
136 .fault = filemap_fault,
137 .map_pages = filemap_map_pages,
138 .page_mkwrite = nilfs_page_mkwrite,
139 .remap_pages = generic_file_remap_pages,
140};
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;
146 return 0;
147}
148
149/*
150 * We have mostly NULL's here: the current defaults are ok for
151 * the nilfs filesystem.
152 */
153const struct file_operations nilfs_file_operations = {
154 .llseek = generic_file_llseek,
155 .read = do_sync_read,
156 .write = do_sync_write,
157 .aio_read = generic_file_aio_read,
158 .aio_write = generic_file_aio_write,
159 .unlocked_ioctl = nilfs_ioctl,
160#ifdef CONFIG_COMPAT
161 .compat_ioctl = nilfs_compat_ioctl,
162#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
170const struct inode_operations nilfs_file_inode_operations = {
171 .setattr = nilfs_setattr,
172 .permission = nilfs_permission,
173 .fiemap = nilfs_fiemap,
174};
175
176/* end of file */