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 30f183ff4fSRyusuke Konishi int nilfs_sync_file(struct file *file, struct dentry *dentry, 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 */ 40f183ff4fSRyusuke Konishi struct inode *inode = dentry->d_inode; 41f183ff4fSRyusuke Konishi int err; 42f183ff4fSRyusuke Konishi 43f183ff4fSRyusuke Konishi if (!nilfs_inode_dirty(inode)) 44f183ff4fSRyusuke Konishi return 0; 45f183ff4fSRyusuke Konishi 46f183ff4fSRyusuke Konishi if (datasync) 47f183ff4fSRyusuke Konishi err = nilfs_construct_dsync_segment(inode->i_sb, inode); 48f183ff4fSRyusuke Konishi else 49f183ff4fSRyusuke Konishi err = nilfs_construct_segment(inode->i_sb); 50f183ff4fSRyusuke Konishi 51f183ff4fSRyusuke Konishi return err; 52f183ff4fSRyusuke Konishi } 53f183ff4fSRyusuke Konishi 54f183ff4fSRyusuke Konishi static ssize_t 55f183ff4fSRyusuke Konishi nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, 56f183ff4fSRyusuke Konishi unsigned long nr_segs, loff_t pos) 57f183ff4fSRyusuke Konishi { 58f183ff4fSRyusuke Konishi struct file *file = iocb->ki_filp; 59f183ff4fSRyusuke Konishi struct inode *inode = file->f_dentry->d_inode; 60f183ff4fSRyusuke Konishi ssize_t ret; 61f183ff4fSRyusuke Konishi 62f183ff4fSRyusuke Konishi ret = generic_file_aio_write(iocb, iov, nr_segs, pos); 63f183ff4fSRyusuke Konishi if (ret <= 0) 64f183ff4fSRyusuke Konishi return ret; 65f183ff4fSRyusuke Konishi 66f183ff4fSRyusuke Konishi if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) { 67f183ff4fSRyusuke Konishi int err; 68f183ff4fSRyusuke Konishi 69f183ff4fSRyusuke Konishi err = nilfs_construct_dsync_segment(inode->i_sb, inode); 70f183ff4fSRyusuke Konishi if (unlikely(err)) 71f183ff4fSRyusuke Konishi return err; 72f183ff4fSRyusuke Konishi } 73f183ff4fSRyusuke Konishi return ret; 74f183ff4fSRyusuke Konishi } 75f183ff4fSRyusuke Konishi 769ff05123SRyusuke Konishi static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 77f183ff4fSRyusuke Konishi { 789ff05123SRyusuke Konishi struct page *page = vmf->page; 799ff05123SRyusuke Konishi struct inode *inode = vma->vm_file->f_dentry->d_inode; 809ff05123SRyusuke Konishi struct nilfs_transaction_info ti; 819ff05123SRyusuke Konishi int ret; 829ff05123SRyusuke Konishi 839ff05123SRyusuke Konishi if (unlikely(nilfs_near_disk_full(NILFS_SB(inode->i_sb)->s_nilfs))) 849ff05123SRyusuke Konishi return VM_FAULT_SIGBUS; /* -ENOSPC */ 859ff05123SRyusuke Konishi 869ff05123SRyusuke Konishi lock_page(page); 879ff05123SRyusuke Konishi if (page->mapping != inode->i_mapping || 889ff05123SRyusuke Konishi page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) { 899ff05123SRyusuke Konishi unlock_page(page); 909ff05123SRyusuke Konishi return VM_FAULT_NOPAGE; /* make the VM retry the fault */ 919ff05123SRyusuke Konishi } 929ff05123SRyusuke Konishi 939ff05123SRyusuke Konishi /* 949ff05123SRyusuke Konishi * check to see if the page is mapped already (no holes) 959ff05123SRyusuke Konishi */ 969ff05123SRyusuke Konishi if (PageMappedToDisk(page)) { 979ff05123SRyusuke Konishi unlock_page(page); 989ff05123SRyusuke Konishi goto mapped; 999ff05123SRyusuke Konishi } 1009ff05123SRyusuke Konishi if (page_has_buffers(page)) { 1019ff05123SRyusuke Konishi struct buffer_head *bh, *head; 1029ff05123SRyusuke Konishi int fully_mapped = 1; 1039ff05123SRyusuke Konishi 1049ff05123SRyusuke Konishi bh = head = page_buffers(page); 1059ff05123SRyusuke Konishi do { 1069ff05123SRyusuke Konishi if (!buffer_mapped(bh)) { 1079ff05123SRyusuke Konishi fully_mapped = 0; 1089ff05123SRyusuke Konishi break; 1099ff05123SRyusuke Konishi } 1109ff05123SRyusuke Konishi } while (bh = bh->b_this_page, bh != head); 1119ff05123SRyusuke Konishi 1129ff05123SRyusuke Konishi if (fully_mapped) { 1139ff05123SRyusuke Konishi SetPageMappedToDisk(page); 1149ff05123SRyusuke Konishi unlock_page(page); 1159ff05123SRyusuke Konishi goto mapped; 1169ff05123SRyusuke Konishi } 1179ff05123SRyusuke Konishi } 1189ff05123SRyusuke Konishi unlock_page(page); 1199ff05123SRyusuke Konishi 1209ff05123SRyusuke Konishi /* 1219ff05123SRyusuke Konishi * fill hole blocks 1229ff05123SRyusuke Konishi */ 1239ff05123SRyusuke Konishi ret = nilfs_transaction_begin(inode->i_sb, &ti, 1); 1249ff05123SRyusuke Konishi /* never returns -ENOMEM, but may return -ENOSPC */ 1259ff05123SRyusuke Konishi if (unlikely(ret)) 1269ff05123SRyusuke Konishi return VM_FAULT_SIGBUS; 1279ff05123SRyusuke Konishi 1289ff05123SRyusuke Konishi ret = block_page_mkwrite(vma, vmf, nilfs_get_block); 1299ff05123SRyusuke Konishi if (unlikely(ret)) { 1309ff05123SRyusuke Konishi nilfs_transaction_abort(inode->i_sb); 1319ff05123SRyusuke Konishi return ret; 1329ff05123SRyusuke Konishi } 1339ff05123SRyusuke Konishi nilfs_transaction_commit(inode->i_sb); 1349ff05123SRyusuke Konishi 1359ff05123SRyusuke Konishi mapped: 136f183ff4fSRyusuke Konishi SetPageChecked(page); 137f183ff4fSRyusuke Konishi wait_on_page_writeback(page); 138f183ff4fSRyusuke Konishi return 0; 139f183ff4fSRyusuke Konishi } 140f183ff4fSRyusuke Konishi 141f183ff4fSRyusuke Konishi struct vm_operations_struct nilfs_file_vm_ops = { 142f183ff4fSRyusuke Konishi .fault = filemap_fault, 143f183ff4fSRyusuke Konishi .page_mkwrite = nilfs_page_mkwrite, 144f183ff4fSRyusuke Konishi }; 145f183ff4fSRyusuke Konishi 146f183ff4fSRyusuke Konishi static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma) 147f183ff4fSRyusuke Konishi { 148f183ff4fSRyusuke Konishi file_accessed(file); 149f183ff4fSRyusuke Konishi vma->vm_ops = &nilfs_file_vm_ops; 150f183ff4fSRyusuke Konishi vma->vm_flags |= VM_CAN_NONLINEAR; 151f183ff4fSRyusuke Konishi return 0; 152f183ff4fSRyusuke Konishi } 153f183ff4fSRyusuke Konishi 154f183ff4fSRyusuke Konishi /* 155f183ff4fSRyusuke Konishi * We have mostly NULL's here: the current defaults are ok for 156f183ff4fSRyusuke Konishi * the nilfs filesystem. 157f183ff4fSRyusuke Konishi */ 158f183ff4fSRyusuke Konishi struct file_operations nilfs_file_operations = { 159f183ff4fSRyusuke Konishi .llseek = generic_file_llseek, 160f183ff4fSRyusuke Konishi .read = do_sync_read, 161f183ff4fSRyusuke Konishi .write = do_sync_write, 162f183ff4fSRyusuke Konishi .aio_read = generic_file_aio_read, 163f183ff4fSRyusuke Konishi .aio_write = nilfs_file_aio_write, 164f183ff4fSRyusuke Konishi .ioctl = nilfs_ioctl, 165f183ff4fSRyusuke Konishi #ifdef CONFIG_COMPAT 166f183ff4fSRyusuke Konishi .compat_ioctl = nilfs_compat_ioctl, 167f183ff4fSRyusuke Konishi #endif /* CONFIG_COMPAT */ 168f183ff4fSRyusuke Konishi .mmap = nilfs_file_mmap, 169f183ff4fSRyusuke Konishi .open = generic_file_open, 170f183ff4fSRyusuke Konishi /* .release = nilfs_release_file, */ 171f183ff4fSRyusuke Konishi .fsync = nilfs_sync_file, 172f183ff4fSRyusuke Konishi .splice_read = generic_file_splice_read, 173f183ff4fSRyusuke Konishi }; 174f183ff4fSRyusuke Konishi 175f183ff4fSRyusuke Konishi struct inode_operations nilfs_file_inode_operations = { 176f183ff4fSRyusuke Konishi .truncate = nilfs_truncate, 177f183ff4fSRyusuke Konishi .setattr = nilfs_setattr, 178f183ff4fSRyusuke Konishi .permission = nilfs_permission, 179f183ff4fSRyusuke Konishi }; 180f183ff4fSRyusuke Konishi 181f183ff4fSRyusuke Konishi /* end of file */ 182