aboutsummaryrefslogtreecommitdiffstats
path: root/fs/nilfs2/file.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nilfs2/file.c')
-rw-r--r--fs/nilfs2/file.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/fs/nilfs2/file.c b/fs/nilfs2/file.c
new file mode 100644
index 000000000000..6bd84a0d8238
--- /dev/null
+++ b/fs/nilfs2/file.c
@@ -0,0 +1,160 @@
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, struct dentry *dentry, 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 = dentry->d_inode;
41 int err;
42
43 if (!nilfs_inode_dirty(inode))
44 return 0;
45
46 if (datasync)
47 err = nilfs_construct_dsync_segment(inode->i_sb, inode, 0,
48 LLONG_MAX);
49 else
50 err = nilfs_construct_segment(inode->i_sb);
51
52 return err;
53}
54
55static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
56{
57 struct page *page = vmf->page;
58 struct inode *inode = vma->vm_file->f_dentry->d_inode;
59 struct nilfs_transaction_info ti;
60 int ret;
61
62 if (unlikely(nilfs_near_disk_full(NILFS_SB(inode->i_sb)->s_nilfs)))
63 return VM_FAULT_SIGBUS; /* -ENOSPC */
64
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 return VM_FAULT_NOPAGE; /* make the VM retry the fault */
70 }
71
72 /*
73 * check to see if the page is mapped already (no holes)
74 */
75 if (PageMappedToDisk(page)) {
76 unlock_page(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 unlock_page(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 return VM_FAULT_SIGBUS;
106
107 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
108 if (unlikely(ret)) {
109 nilfs_transaction_abort(inode->i_sb);
110 return ret;
111 }
112 nilfs_transaction_commit(inode->i_sb);
113
114 mapped:
115 SetPageChecked(page);
116 wait_on_page_writeback(page);
117 return 0;
118}
119
120struct vm_operations_struct nilfs_file_vm_ops = {
121 .fault = filemap_fault,
122 .page_mkwrite = nilfs_page_mkwrite,
123};
124
125static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
126{
127 file_accessed(file);
128 vma->vm_ops = &nilfs_file_vm_ops;
129 vma->vm_flags |= VM_CAN_NONLINEAR;
130 return 0;
131}
132
133/*
134 * We have mostly NULL's here: the current defaults are ok for
135 * the nilfs filesystem.
136 */
137struct file_operations nilfs_file_operations = {
138 .llseek = generic_file_llseek,
139 .read = do_sync_read,
140 .write = do_sync_write,
141 .aio_read = generic_file_aio_read,
142 .aio_write = generic_file_aio_write,
143 .unlocked_ioctl = nilfs_ioctl,
144#ifdef CONFIG_COMPAT
145 .compat_ioctl = nilfs_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
154struct inode_operations nilfs_file_inode_operations = {
155 .truncate = nilfs_truncate,
156 .setattr = nilfs_setattr,
157 .permission = nilfs_permission,
158};
159
160/* end of file */
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-02 20:56:46 -0400