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Commit | Line | Data |
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f183ff4f RK |
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 | ||
02c24a82 | 30 | int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
f183ff4f RK |
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 | */ | |
11475975 | 40 | struct the_nilfs *nilfs; |
7ea80859 | 41 | struct inode *inode = file->f_mapping->host; |
f183ff4f RK |
42 | int err; |
43 | ||
02c24a82 JB |
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 | ||
11475975 RK |
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); | |
02c24a82 | 55 | } |
02c24a82 | 56 | mutex_unlock(&inode->i_mutex); |
11475975 RK |
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 | } | |
f183ff4f RK |
64 | return err; |
65 | } | |
66 | ||
9ff05123 | 67 | static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
f183ff4f | 68 | { |
9ff05123 RK |
69 | struct page *page = vmf->page; |
70 | struct inode *inode = vma->vm_file->f_dentry->d_inode; | |
71 | struct nilfs_transaction_info ti; | |
2c22b337 | 72 | int ret = 0; |
9ff05123 | 73 | |
e3154e97 | 74 | if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info))) |
9ff05123 RK |
75 | return VM_FAULT_SIGBUS; /* -ENOSPC */ |
76 | ||
2c22b337 | 77 | sb_start_pagefault(inode->i_sb); |
9ff05123 RK |
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); | |
2c22b337 JK |
82 | ret = -EFAULT; /* make the VM retry the fault */ |
83 | goto out; | |
9ff05123 RK |
84 | } |
85 | ||
86 | /* | |
87 | * check to see if the page is mapped already (no holes) | |
88 | */ | |
34094537 | 89 | if (PageMappedToDisk(page)) |
9ff05123 | 90 | goto mapped; |
34094537 | 91 | |
9ff05123 RK |
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); | |
9ff05123 RK |
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)) | |
2c22b337 | 117 | goto out; |
9ff05123 | 118 | |
2c22b337 JK |
119 | ret = __block_page_mkwrite(vma, vmf, nilfs_get_block); |
120 | if (ret) { | |
9ff05123 | 121 | nilfs_transaction_abort(inode->i_sb); |
2c22b337 | 122 | goto out; |
9ff05123 | 123 | } |
34094537 | 124 | nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits)); |
9ff05123 RK |
125 | nilfs_transaction_commit(inode->i_sb); |
126 | ||
127 | mapped: | |
f183ff4f | 128 | wait_on_page_writeback(page); |
2c22b337 JK |
129 | out: |
130 | sb_end_pagefault(inode->i_sb); | |
131 | return block_page_mkwrite_return(ret); | |
f183ff4f RK |
132 | } |
133 | ||
f0f37e2f | 134 | static const struct vm_operations_struct nilfs_file_vm_ops = { |
f183ff4f RK |
135 | .fault = filemap_fault, |
136 | .page_mkwrite = nilfs_page_mkwrite, | |
137 | }; | |
138 | ||
139 | static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
140 | { | |
141 | file_accessed(file); | |
142 | vma->vm_ops = &nilfs_file_vm_ops; | |
143 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | /* | |
148 | * We have mostly NULL's here: the current defaults are ok for | |
149 | * the nilfs filesystem. | |
150 | */ | |
828c0950 | 151 | const struct file_operations nilfs_file_operations = { |
f183ff4f RK |
152 | .llseek = generic_file_llseek, |
153 | .read = do_sync_read, | |
154 | .write = do_sync_write, | |
155 | .aio_read = generic_file_aio_read, | |
f30bf3e4 | 156 | .aio_write = generic_file_aio_write, |
7a946193 | 157 | .unlocked_ioctl = nilfs_ioctl, |
f183ff4f | 158 | #ifdef CONFIG_COMPAT |
828b1c50 | 159 | .compat_ioctl = nilfs_compat_ioctl, |
f183ff4f RK |
160 | #endif /* CONFIG_COMPAT */ |
161 | .mmap = nilfs_file_mmap, | |
162 | .open = generic_file_open, | |
163 | /* .release = nilfs_release_file, */ | |
164 | .fsync = nilfs_sync_file, | |
165 | .splice_read = generic_file_splice_read, | |
166 | }; | |
167 | ||
6e1d5dcc | 168 | const struct inode_operations nilfs_file_inode_operations = { |
f183ff4f RK |
169 | .truncate = nilfs_truncate, |
170 | .setattr = nilfs_setattr, | |
171 | .permission = nilfs_permission, | |
622daaff | 172 | .fiemap = nilfs_fiemap, |
f183ff4f RK |
173 | }; |
174 | ||
175 | /* end of file */ |