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Linux/fs/nilfs2/file.c

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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  * 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, loff_t start, loff_t end, 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 the_nilfs *nilfs;
 41         struct inode *inode = file->f_mapping->host;
 42         int err = 0;
 43 
 44         if (nilfs_inode_dirty(inode)) {
 45                 if (datasync)
 46                         err = nilfs_construct_dsync_segment(inode->i_sb, inode,
 47                                                             start, end);
 48                 else
 49                         err = nilfs_construct_segment(inode->i_sb);
 50         }
 51 
 52         nilfs = inode->i_sb->s_fs_info;
 53         if (!err)
 54                 err = nilfs_flush_device(nilfs);
 55 
 56         return err;
 57 }
 58 
 59 static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 60 {
 61         struct page *page = vmf->page;
 62         struct inode *inode = file_inode(vma->vm_file);
 63         struct nilfs_transaction_info ti;
 64         int ret = 0;
 65 
 66         if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
 67                 return VM_FAULT_SIGBUS; /* -ENOSPC */
 68 
 69         sb_start_pagefault(inode->i_sb);
 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);
 74                 ret = -EFAULT;  /* make the VM retry the fault */
 75                 goto out;
 76         }
 77 
 78         /*
 79          * check to see if the page is mapped already (no holes)
 80          */
 81         if (PageMappedToDisk(page))
 82                 goto mapped;
 83 
 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);
 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))
109                 goto out;
110 
111         file_update_time(vma->vm_file);
112         ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
113         if (ret) {
114                 nilfs_transaction_abort(inode->i_sb);
115                 goto out;
116         }
117         nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
118         nilfs_transaction_commit(inode->i_sb);
119 
120  mapped:
121         wait_for_stable_page(page);
122  out:
123         sb_end_pagefault(inode->i_sb);
124         return block_page_mkwrite_return(ret);
125 }
126 
127 static const struct vm_operations_struct nilfs_file_vm_ops = {
128         .fault          = filemap_fault,
129         .map_pages      = filemap_map_pages,
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;
137         return 0;
138 }
139 
140 /*
141  * We have mostly NULL's here: the current defaults are ok for
142  * the nilfs filesystem.
143  */
144 const struct file_operations nilfs_file_operations = {
145         .llseek         = generic_file_llseek,
146         .read_iter      = generic_file_read_iter,
147         .write_iter     = generic_file_write_iter,
148         .unlocked_ioctl = nilfs_ioctl,
149 #ifdef CONFIG_COMPAT
150         .compat_ioctl   = nilfs_compat_ioctl,
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 
159 const struct inode_operations nilfs_file_inode_operations = {
160         .setattr        = nilfs_setattr,
161         .permission     = nilfs_permission,
162         .fiemap         = nilfs_fiemap,
163 };
164 
165 /* end of file */
166 

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