1f183ff4fSRyusuke Konishi /* 2f183ff4fSRyusuke Konishi * file.c - NILFS regular file handling primitives including fsync(). 3f183ff4fSRyusuke Konishi * 4f183ff4fSRyusuke Konishi * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 5f183ff4fSRyusuke Konishi * 6f183ff4fSRyusuke Konishi * This program is free software; you can redistribute it and/or modify 7f183ff4fSRyusuke Konishi * it under the terms of the GNU General Public License as published by 8f183ff4fSRyusuke Konishi * the Free Software Foundation; either version 2 of the License, or 9f183ff4fSRyusuke Konishi * (at your option) any later version. 10f183ff4fSRyusuke Konishi * 11f183ff4fSRyusuke Konishi * This program is distributed in the hope that it will be useful, 12f183ff4fSRyusuke Konishi * but WITHOUT ANY WARRANTY; without even the implied warranty of 13f183ff4fSRyusuke Konishi * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14f183ff4fSRyusuke Konishi * GNU General Public License for more details. 15f183ff4fSRyusuke Konishi * 16f183ff4fSRyusuke Konishi * You should have received a copy of the GNU General Public License 17f183ff4fSRyusuke Konishi * along with this program; if not, write to the Free Software 18f183ff4fSRyusuke Konishi * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19f183ff4fSRyusuke Konishi * 20f183ff4fSRyusuke Konishi * Written by Amagai Yoshiji <amagai@osrg.net>, 21f183ff4fSRyusuke Konishi * Ryusuke Konishi <ryusuke@osrg.net> 22f183ff4fSRyusuke Konishi */ 23f183ff4fSRyusuke Konishi 24f183ff4fSRyusuke Konishi #include <linux/fs.h> 25f183ff4fSRyusuke Konishi #include <linux/mm.h> 26f183ff4fSRyusuke Konishi #include <linux/writeback.h> 27f183ff4fSRyusuke Konishi #include "nilfs.h" 28f183ff4fSRyusuke Konishi #include "segment.h" 29f183ff4fSRyusuke Konishi 3002c24a82SJosef Bacik int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) 31f183ff4fSRyusuke Konishi { 32f183ff4fSRyusuke Konishi /* 33f183ff4fSRyusuke Konishi * Called from fsync() system call 34f183ff4fSRyusuke Konishi * This is the only entry point that can catch write and synch 35f183ff4fSRyusuke Konishi * timing for both data blocks and intermediate blocks. 36f183ff4fSRyusuke Konishi * 37f183ff4fSRyusuke Konishi * This function should be implemented when the writeback function 38f183ff4fSRyusuke Konishi * will be implemented. 39f183ff4fSRyusuke Konishi */ 4011475975SRyusuke Konishi struct the_nilfs *nilfs; 417ea80859SChristoph Hellwig struct inode *inode = file->f_mapping->host; 42f183ff4fSRyusuke Konishi int err; 43f183ff4fSRyusuke Konishi 4402c24a82SJosef Bacik err = filemap_write_and_wait_range(inode->i_mapping, start, end); 4502c24a82SJosef Bacik if (err) 4602c24a82SJosef Bacik return err; 4702c24a82SJosef Bacik mutex_lock(&inode->i_mutex); 4802c24a82SJosef Bacik 4911475975SRyusuke Konishi if (nilfs_inode_dirty(inode)) { 50f183ff4fSRyusuke Konishi if (datasync) 5111475975SRyusuke Konishi err = nilfs_construct_dsync_segment(inode->i_sb, inode, 5211475975SRyusuke Konishi 0, LLONG_MAX); 53f183ff4fSRyusuke Konishi else 54f183ff4fSRyusuke Konishi err = nilfs_construct_segment(inode->i_sb); 5511475975SRyusuke Konishi } 5602c24a82SJosef Bacik mutex_unlock(&inode->i_mutex); 5711475975SRyusuke Konishi 5811475975SRyusuke Konishi nilfs = inode->i_sb->s_fs_info; 5911475975SRyusuke Konishi if (!err && nilfs_test_opt(nilfs, BARRIER)) { 6011475975SRyusuke Konishi err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); 6111475975SRyusuke Konishi if (err != -EIO) 6211475975SRyusuke Konishi err = 0; 6311475975SRyusuke Konishi } 64f183ff4fSRyusuke Konishi return err; 65f183ff4fSRyusuke Konishi } 66f183ff4fSRyusuke Konishi 679ff05123SRyusuke Konishi static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 68f183ff4fSRyusuke Konishi { 699ff05123SRyusuke Konishi struct page *page = vmf->page; 709ff05123SRyusuke Konishi struct inode *inode = vma->vm_file->f_dentry->d_inode; 719ff05123SRyusuke Konishi struct nilfs_transaction_info ti; 722c22b337SJan Kara int ret = 0; 739ff05123SRyusuke Konishi 74e3154e97SRyusuke Konishi if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info))) 759ff05123SRyusuke Konishi return VM_FAULT_SIGBUS; /* -ENOSPC */ 769ff05123SRyusuke Konishi 772c22b337SJan Kara sb_start_pagefault(inode->i_sb); 789ff05123SRyusuke Konishi lock_page(page); 799ff05123SRyusuke Konishi if (page->mapping != inode->i_mapping || 809ff05123SRyusuke Konishi page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) { 819ff05123SRyusuke Konishi unlock_page(page); 822c22b337SJan Kara ret = -EFAULT; /* make the VM retry the fault */ 832c22b337SJan Kara goto out; 849ff05123SRyusuke Konishi } 859ff05123SRyusuke Konishi 869ff05123SRyusuke Konishi /* 879ff05123SRyusuke Konishi * check to see if the page is mapped already (no holes) 889ff05123SRyusuke Konishi */ 8934094537SRyusuke Konishi if (PageMappedToDisk(page)) 909ff05123SRyusuke Konishi goto mapped; 9134094537SRyusuke Konishi 929ff05123SRyusuke Konishi if (page_has_buffers(page)) { 939ff05123SRyusuke Konishi struct buffer_head *bh, *head; 949ff05123SRyusuke Konishi int fully_mapped = 1; 959ff05123SRyusuke Konishi 969ff05123SRyusuke Konishi bh = head = page_buffers(page); 979ff05123SRyusuke Konishi do { 989ff05123SRyusuke Konishi if (!buffer_mapped(bh)) { 999ff05123SRyusuke Konishi fully_mapped = 0; 1009ff05123SRyusuke Konishi break; 1019ff05123SRyusuke Konishi } 1029ff05123SRyusuke Konishi } while (bh = bh->b_this_page, bh != head); 1039ff05123SRyusuke Konishi 1049ff05123SRyusuke Konishi if (fully_mapped) { 1059ff05123SRyusuke Konishi SetPageMappedToDisk(page); 1069ff05123SRyusuke Konishi goto mapped; 1079ff05123SRyusuke Konishi } 1089ff05123SRyusuke Konishi } 1099ff05123SRyusuke Konishi unlock_page(page); 1109ff05123SRyusuke Konishi 1119ff05123SRyusuke Konishi /* 1129ff05123SRyusuke Konishi * fill hole blocks 1139ff05123SRyusuke Konishi */ 1149ff05123SRyusuke Konishi ret = nilfs_transaction_begin(inode->i_sb, &ti, 1); 1159ff05123SRyusuke Konishi /* never returns -ENOMEM, but may return -ENOSPC */ 1169ff05123SRyusuke Konishi if (unlikely(ret)) 1172c22b337SJan Kara goto out; 1189ff05123SRyusuke Konishi 119041bbb6dSTheodore Ts'o file_update_time(vma->vm_file); 1202c22b337SJan Kara ret = __block_page_mkwrite(vma, vmf, nilfs_get_block); 1212c22b337SJan Kara if (ret) { 1229ff05123SRyusuke Konishi nilfs_transaction_abort(inode->i_sb); 1232c22b337SJan Kara goto out; 1249ff05123SRyusuke Konishi } 12534094537SRyusuke Konishi nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits)); 1269ff05123SRyusuke Konishi nilfs_transaction_commit(inode->i_sb); 1279ff05123SRyusuke Konishi 1289ff05123SRyusuke Konishi mapped: 129f183ff4fSRyusuke Konishi wait_on_page_writeback(page); 1302c22b337SJan Kara out: 1312c22b337SJan Kara sb_end_pagefault(inode->i_sb); 1322c22b337SJan Kara return block_page_mkwrite_return(ret); 133f183ff4fSRyusuke Konishi } 134f183ff4fSRyusuke Konishi 135f0f37e2fSAlexey Dobriyan static const struct vm_operations_struct nilfs_file_vm_ops = { 136f183ff4fSRyusuke Konishi .fault = filemap_fault, 137f183ff4fSRyusuke Konishi .page_mkwrite = nilfs_page_mkwrite, 1380b173bc4SKonstantin Khlebnikov .remap_pages = generic_file_remap_pages, 139f183ff4fSRyusuke Konishi }; 140f183ff4fSRyusuke Konishi 141f183ff4fSRyusuke Konishi static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma) 142f183ff4fSRyusuke Konishi { 143f183ff4fSRyusuke Konishi file_accessed(file); 144f183ff4fSRyusuke Konishi vma->vm_ops = &nilfs_file_vm_ops; 145f183ff4fSRyusuke Konishi return 0; 146f183ff4fSRyusuke Konishi } 147f183ff4fSRyusuke Konishi 148f183ff4fSRyusuke Konishi /* 149f183ff4fSRyusuke Konishi * We have mostly NULL's here: the current defaults are ok for 150f183ff4fSRyusuke Konishi * the nilfs filesystem. 151f183ff4fSRyusuke Konishi */ 152828c0950SAlexey Dobriyan const struct file_operations nilfs_file_operations = { 153f183ff4fSRyusuke Konishi .llseek = generic_file_llseek, 154f183ff4fSRyusuke Konishi .read = do_sync_read, 155f183ff4fSRyusuke Konishi .write = do_sync_write, 156f183ff4fSRyusuke Konishi .aio_read = generic_file_aio_read, 157f30bf3e4SRyusuke Konishi .aio_write = generic_file_aio_write, 1587a946193SRyusuke Konishi .unlocked_ioctl = nilfs_ioctl, 159f183ff4fSRyusuke Konishi #ifdef CONFIG_COMPAT 160828b1c50SRyusuke Konishi .compat_ioctl = nilfs_compat_ioctl, 161f183ff4fSRyusuke Konishi #endif /* CONFIG_COMPAT */ 162f183ff4fSRyusuke Konishi .mmap = nilfs_file_mmap, 163f183ff4fSRyusuke Konishi .open = generic_file_open, 164f183ff4fSRyusuke Konishi /* .release = nilfs_release_file, */ 165f183ff4fSRyusuke Konishi .fsync = nilfs_sync_file, 166f183ff4fSRyusuke Konishi .splice_read = generic_file_splice_read, 167f183ff4fSRyusuke Konishi }; 168f183ff4fSRyusuke Konishi 1696e1d5dccSAlexey Dobriyan const struct inode_operations nilfs_file_inode_operations = { 170f183ff4fSRyusuke Konishi .truncate = nilfs_truncate, 171f183ff4fSRyusuke Konishi .setattr = nilfs_setattr, 172f183ff4fSRyusuke Konishi .permission = nilfs_permission, 173622daaffSRyusuke Konishi .fiemap = nilfs_fiemap, 174f183ff4fSRyusuke Konishi }; 175f183ff4fSRyusuke Konishi 176f183ff4fSRyusuke Konishi /* end of file */ 177