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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 * 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_area_struct *vma, struct vm_fault *vmf)
55{
56 struct page *page = vmf->page;
57 struct inode *inode = file_inode(vma->vm_file);
58 struct nilfs_transaction_info ti;
59 int ret = 0;
60
61 if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
62 return VM_FAULT_SIGBUS; /* -ENOSPC */
63
64 sb_start_pagefault(inode->i_sb);
65 lock_page(page);
66 if (page->mapping != inode->i_mapping ||
67 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
68 unlock_page(page);
69 ret = -EFAULT; /* make the VM retry the fault */
70 goto out;
71 }
72
73 /*
74 * check to see if the page is mapped already (no holes)
75 */
76 if (PageMappedToDisk(page))
77 goto mapped;
78
79 if (page_has_buffers(page)) {
80 struct buffer_head *bh, *head;
81 int fully_mapped = 1;
82
83 bh = head = page_buffers(page);
84 do {
85 if (!buffer_mapped(bh)) {
86 fully_mapped = 0;
87 break;
88 }
89 } while (bh = bh->b_this_page, bh != head);
90
91 if (fully_mapped) {
92 SetPageMappedToDisk(page);
93 goto mapped;
94 }
95 }
96 unlock_page(page);
97
98 /*
99 * fill hole blocks
100 */
101 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
102 /* never returns -ENOMEM, but may return -ENOSPC */
103 if (unlikely(ret))
104 goto out;
105
106 file_update_time(vma->vm_file);
107 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
108 if (ret) {
109 nilfs_transaction_abort(inode->i_sb);
110 goto out;
111 }
112 nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
113 nilfs_transaction_commit(inode->i_sb);
114
115 mapped:
116 wait_for_stable_page(page);
117 out:
118 sb_end_pagefault(inode->i_sb);
119 return block_page_mkwrite_return(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 = generic_file_splice_read,
152};
153
154const struct inode_operations nilfs_file_inode_operations = {
155 .setattr = nilfs_setattr,
156 .permission = nilfs_permission,
157 .fiemap = nilfs_fiemap,
158};
159
160/* end of file */