Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 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 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 30 | int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 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 | */ |
Ryusuke Konishi | 1147597 | 2012-05-31 16:26:11 -0700 | [diff] [blame] | 40 | struct the_nilfs *nilfs; |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 41 | struct inode *inode = file->f_mapping->host; |
Andreas Rohner | 75dc857 | 2014-12-10 15:54:29 -0800 | [diff] [blame] | 42 | int err = 0; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 43 | |
Ryusuke Konishi | 1147597 | 2012-05-31 16:26:11 -0700 | [diff] [blame] | 44 | if (nilfs_inode_dirty(inode)) { |
| 45 | if (datasync) |
| 46 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, |
Andreas Rohner | 75dc857 | 2014-12-10 15:54:29 -0800 | [diff] [blame] | 47 | start, end); |
Ryusuke Konishi | 1147597 | 2012-05-31 16:26:11 -0700 | [diff] [blame] | 48 | else |
| 49 | err = nilfs_construct_segment(inode->i_sb); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 50 | } |
Ryusuke Konishi | 1147597 | 2012-05-31 16:26:11 -0700 | [diff] [blame] | 51 | |
| 52 | nilfs = inode->i_sb->s_fs_info; |
Andreas Rohner | e2c7617 | 2014-10-13 15:53:20 -0700 | [diff] [blame] | 53 | if (!err) |
| 54 | err = nilfs_flush_device(nilfs); |
| 55 | |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 56 | return err; |
| 57 | } |
| 58 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 59 | static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 60 | { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 61 | struct page *page = vmf->page; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 62 | struct inode *inode = file_inode(vma->vm_file); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 63 | struct nilfs_transaction_info ti; |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 64 | int ret = 0; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 65 | |
Ryusuke Konishi | e3154e9 | 2011-03-09 11:05:08 +0900 | [diff] [blame] | 66 | if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info))) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 67 | return VM_FAULT_SIGBUS; /* -ENOSPC */ |
| 68 | |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 69 | sb_start_pagefault(inode->i_sb); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 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); |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 74 | ret = -EFAULT; /* make the VM retry the fault */ |
| 75 | goto out; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | /* |
| 79 | * check to see if the page is mapped already (no holes) |
| 80 | */ |
Ryusuke Konishi | 3409453 | 2011-03-27 22:50:49 +0900 | [diff] [blame] | 81 | if (PageMappedToDisk(page)) |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 82 | goto mapped; |
Ryusuke Konishi | 3409453 | 2011-03-27 22:50:49 +0900 | [diff] [blame] | 83 | |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 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); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 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)) |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 109 | goto out; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 110 | |
Theodore Ts'o | 041bbb6d | 2012-09-30 23:04:56 -0400 | [diff] [blame] | 111 | file_update_time(vma->vm_file); |
Ross Zwisler | 5c50002 | 2015-10-13 16:51:02 -0600 | [diff] [blame^] | 112 | ret = block_page_mkwrite(vma, vmf, nilfs_get_block); |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 113 | if (ret) { |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 114 | nilfs_transaction_abort(inode->i_sb); |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 115 | goto out; |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 116 | } |
Ryusuke Konishi | 3409453 | 2011-03-27 22:50:49 +0900 | [diff] [blame] | 117 | nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits)); |
Ryusuke Konishi | 9ff05123 | 2009-04-06 19:01:37 -0700 | [diff] [blame] | 118 | nilfs_transaction_commit(inode->i_sb); |
| 119 | |
| 120 | mapped: |
Darrick J. Wong | 1d1d1a7 | 2013-02-21 16:42:51 -0800 | [diff] [blame] | 121 | wait_for_stable_page(page); |
Jan Kara | 2c22b33 | 2012-06-12 16:20:44 +0200 | [diff] [blame] | 122 | out: |
| 123 | sb_end_pagefault(inode->i_sb); |
| 124 | return block_page_mkwrite_return(ret); |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 125 | } |
| 126 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 127 | static const struct vm_operations_struct nilfs_file_vm_ops = { |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 128 | .fault = filemap_fault, |
Kirill A. Shutemov | f182036 | 2014-04-07 15:37:19 -0700 | [diff] [blame] | 129 | .map_pages = filemap_map_pages, |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 130 | .page_mkwrite = nilfs_page_mkwrite, |
| 131 | }; |
| 132 | |
| 133 | static 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; |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * We have mostly NULL's here: the current defaults are ok for |
| 142 | * the nilfs filesystem. |
| 143 | */ |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 144 | const struct file_operations nilfs_file_operations = { |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 145 | .llseek = generic_file_llseek, |
Al Viro | aad4f8b | 2014-04-02 14:33:16 -0400 | [diff] [blame] | 146 | .read_iter = generic_file_read_iter, |
Al Viro | 8174202 | 2014-04-03 03:17:43 -0400 | [diff] [blame] | 147 | .write_iter = generic_file_write_iter, |
Ryusuke Konishi | 7a94619 | 2009-04-06 19:01:53 -0700 | [diff] [blame] | 148 | .unlocked_ioctl = nilfs_ioctl, |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 149 | #ifdef CONFIG_COMPAT |
Ryusuke Konishi | 828b1c5 | 2011-02-03 21:26:17 +0900 | [diff] [blame] | 150 | .compat_ioctl = nilfs_compat_ioctl, |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 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 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 159 | const struct inode_operations nilfs_file_inode_operations = { |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 160 | .setattr = nilfs_setattr, |
| 161 | .permission = nilfs_permission, |
Ryusuke Konishi | 622daaff | 2010-12-26 16:38:43 +0900 | [diff] [blame] | 162 | .fiemap = nilfs_fiemap, |
Ryusuke Konishi | f183ff4 | 2009-04-06 19:01:33 -0700 | [diff] [blame] | 163 | }; |
| 164 | |
| 165 | /* end of file */ |