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 | ||
30 | int 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); | |
48 | else | |
49 | err = nilfs_construct_segment(inode->i_sb); | |
50 | ||
51 | return err; | |
52 | } | |
53 | ||
54 | static ssize_t | |
55 | nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
56 | unsigned long nr_segs, loff_t pos) | |
57 | { | |
58 | struct file *file = iocb->ki_filp; | |
59 | struct inode *inode = file->f_dentry->d_inode; | |
60 | ssize_t ret; | |
61 | ||
62 | ret = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
63 | if (ret <= 0) | |
64 | return ret; | |
65 | ||
66 | if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { | |
67 | int err; | |
68 | ||
69 | err = nilfs_construct_dsync_segment(inode->i_sb, inode); | |
70 | if (unlikely(err)) | |
71 | return err; | |
72 | } | |
73 | return ret; | |
74 | } | |
75 | ||
76 | static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
77 | { | |
78 | if (!(vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) | |
79 | return -EPERM; | |
80 | SetPageChecked(page); | |
81 | wait_on_page_writeback(page); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | struct vm_operations_struct nilfs_file_vm_ops = { | |
86 | .fault = filemap_fault, | |
87 | .page_mkwrite = nilfs_page_mkwrite, | |
88 | }; | |
89 | ||
90 | static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
91 | { | |
92 | file_accessed(file); | |
93 | vma->vm_ops = &nilfs_file_vm_ops; | |
94 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* | |
99 | * We have mostly NULL's here: the current defaults are ok for | |
100 | * the nilfs filesystem. | |
101 | */ | |
102 | struct file_operations nilfs_file_operations = { | |
103 | .llseek = generic_file_llseek, | |
104 | .read = do_sync_read, | |
105 | .write = do_sync_write, | |
106 | .aio_read = generic_file_aio_read, | |
107 | .aio_write = nilfs_file_aio_write, | |
108 | .ioctl = nilfs_ioctl, | |
109 | #ifdef CONFIG_COMPAT | |
110 | .compat_ioctl = nilfs_compat_ioctl, | |
111 | #endif /* CONFIG_COMPAT */ | |
112 | .mmap = nilfs_file_mmap, | |
113 | .open = generic_file_open, | |
114 | /* .release = nilfs_release_file, */ | |
115 | .fsync = nilfs_sync_file, | |
116 | .splice_read = generic_file_splice_read, | |
117 | }; | |
118 | ||
119 | struct inode_operations nilfs_file_inode_operations = { | |
120 | .truncate = nilfs_truncate, | |
121 | .setattr = nilfs_setattr, | |
122 | .permission = nilfs_permission, | |
123 | }; | |
124 | ||
125 | /* end of file */ |