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