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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 * 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 = 0;
43
44 if (nilfs_inode_dirty(inode)) {
45 if (datasync)
46 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
47 start, end);
48 else
49 err = nilfs_construct_segment(inode->i_sb);
50 }
51
52 nilfs = inode->i_sb->s_fs_info;
53 if (!err)
54 err = nilfs_flush_device(nilfs);
55
56 return err;
57}
58
59static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
60{
61 struct page *page = vmf->page;
62 struct inode *inode = file_inode(vma->vm_file);
63 struct nilfs_transaction_info ti;
64 int ret = 0;
65
66 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
67 return VM_FAULT_SIGBUS; /* -ENOSPC */
68
69 sb_start_pagefault(inode->i_sb);
70 lock_page(page);
71 if (page->mapping != inode->i_mapping ||
72 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
73 unlock_page(page);
74 ret = -EFAULT; /* make the VM retry the fault */
75 goto out;
76 }
77
78 /*
79 * check to see if the page is mapped already (no holes)
80 */
81 if (PageMappedToDisk(page))
82 goto mapped;
83
84 if (page_has_buffers(page)) {
85 struct buffer_head *bh, *head;
86 int fully_mapped = 1;
87
88 bh = head = page_buffers(page);
89 do {
90 if (!buffer_mapped(bh)) {
91 fully_mapped = 0;
92 break;
93 }
94 } while (bh = bh->b_this_page, bh != head);
95
96 if (fully_mapped) {
97 SetPageMappedToDisk(page);
98 goto mapped;
99 }
100 }
101 unlock_page(page);
102
103 /*
104 * fill hole blocks
105 */
106 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
107 /* never returns -ENOMEM, but may return -ENOSPC */
108 if (unlikely(ret))
109 goto out;
110
111 file_update_time(vma->vm_file);
112 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
113 if (ret) {
114 nilfs_transaction_abort(inode->i_sb);
115 goto out;
116 }
117 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
118 nilfs_transaction_commit(inode->i_sb);
119
120 mapped:
121 wait_for_stable_page(page);
122 out:
123 sb_end_pagefault(inode->i_sb);
124 return block_page_mkwrite_return(ret);
125}
126
127static const struct vm_operations_struct nilfs_file_vm_ops = {
128 .fault = filemap_fault,
129 .map_pages = filemap_map_pages,
130 .page_mkwrite = nilfs_page_mkwrite,
131};
132
133static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
134{
135 file_accessed(file);
136 vma->vm_ops = &nilfs_file_vm_ops;
137 return 0;
138}
139
140/*
141 * We have mostly NULL's here: the current defaults are ok for
142 * the nilfs filesystem.
143 */
144const struct file_operations nilfs_file_operations = {
145 .llseek = generic_file_llseek,
146 .read_iter = generic_file_read_iter,
147 .write_iter = generic_file_write_iter,
148 .unlocked_ioctl = nilfs_ioctl,
149#ifdef CONFIG_COMPAT
150 .compat_ioctl = nilfs_compat_ioctl,
151#endif /* CONFIG_COMPAT */
152 .mmap = nilfs_file_mmap,
153 .open = generic_file_open,
154 /* .release = nilfs_release_file, */
155 .fsync = nilfs_sync_file,
156 .splice_read = generic_file_splice_read,
157};
158
159const struct inode_operations nilfs_file_inode_operations = {
160 .setattr = nilfs_setattr,
161 .permission = nilfs_permission,
162 .fiemap = nilfs_fiemap,
163};
164
165/* 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 inode *inode = file->f_mapping->host;
41 int err;
42
43 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);
50 return 0;
51 }
52
53 if (datasync)
54 err = nilfs_construct_dsync_segment(inode->i_sb, inode, 0,
55 LLONG_MAX);
56 else
57 err = nilfs_construct_segment(inode->i_sb);
58
59 mutex_unlock(&inode->i_mutex);
60 return err;
61}
62
63static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
64{
65 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
70 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
71 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 */
83 if (PageMappedToDisk(page))
84 goto mapped;
85
86 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);
100 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);
114 if (ret != VM_FAULT_LOCKED) {
115 nilfs_transaction_abort(inode->i_sb);
116 return ret;
117 }
118 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
119 nilfs_transaction_commit(inode->i_sb);
120
121 mapped:
122 wait_on_page_writeback(page);
123 return VM_FAULT_LOCKED;
124}
125
126static const struct vm_operations_struct nilfs_file_vm_ops = {
127 .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 */
143const struct file_operations nilfs_file_operations = {
144 .llseek = generic_file_llseek,
145 .read = do_sync_read,
146 .write = do_sync_write,
147 .aio_read = generic_file_aio_read,
148 .aio_write = generic_file_aio_write,
149 .unlocked_ioctl = nilfs_ioctl,
150#ifdef CONFIG_COMPAT
151 .compat_ioctl = nilfs_compat_ioctl,
152#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
160const struct inode_operations nilfs_file_inode_operations = {
161 .truncate = nilfs_truncate,
162 .setattr = nilfs_setattr,
163 .permission = nilfs_permission,
164 .fiemap = nilfs_fiemap,
165};
166
167/* end of file */