1ae98043fSRyusuke Konishi // SPDX-License-Identifier: GPL-2.0+
2f183ff4fSRyusuke Konishi /*
394ee1d91SRyusuke Konishi * NILFS regular file handling primitives including fsync().
4f183ff4fSRyusuke Konishi *
5f183ff4fSRyusuke Konishi * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6f183ff4fSRyusuke Konishi *
74b420ab4SRyusuke Konishi * Written by Amagai Yoshiji and Ryusuke Konishi.
8f183ff4fSRyusuke Konishi */
9f183ff4fSRyusuke Konishi
10f183ff4fSRyusuke Konishi #include <linux/fs.h>
11f183ff4fSRyusuke Konishi #include <linux/mm.h>
12f183ff4fSRyusuke Konishi #include <linux/writeback.h>
13f183ff4fSRyusuke Konishi #include "nilfs.h"
14f183ff4fSRyusuke Konishi #include "segment.h"
15f183ff4fSRyusuke Konishi
nilfs_sync_file(struct file * file,loff_t start,loff_t end,int datasync)1602c24a82SJosef Bacik int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
17f183ff4fSRyusuke Konishi {
18f183ff4fSRyusuke Konishi /*
19f183ff4fSRyusuke Konishi * Called from fsync() system call
20f183ff4fSRyusuke Konishi * This is the only entry point that can catch write and synch
21f183ff4fSRyusuke Konishi * timing for both data blocks and intermediate blocks.
22f183ff4fSRyusuke Konishi *
23f183ff4fSRyusuke Konishi * This function should be implemented when the writeback function
24f183ff4fSRyusuke Konishi * will be implemented.
25f183ff4fSRyusuke Konishi */
2611475975SRyusuke Konishi struct the_nilfs *nilfs;
277ea80859SChristoph Hellwig struct inode *inode = file->f_mapping->host;
2875dc857cSAndreas Rohner int err = 0;
2902c24a82SJosef Bacik
3011475975SRyusuke Konishi if (nilfs_inode_dirty(inode)) {
31f183ff4fSRyusuke Konishi if (datasync)
3211475975SRyusuke Konishi err = nilfs_construct_dsync_segment(inode->i_sb, inode,
3375dc857cSAndreas Rohner start, end);
34f183ff4fSRyusuke Konishi else
35f183ff4fSRyusuke Konishi err = nilfs_construct_segment(inode->i_sb);
3611475975SRyusuke Konishi }
3711475975SRyusuke Konishi
3811475975SRyusuke Konishi nilfs = inode->i_sb->s_fs_info;
39e2c7617aSAndreas Rohner if (!err)
40e2c7617aSAndreas Rohner err = nilfs_flush_device(nilfs);
41e2c7617aSAndreas Rohner
42f183ff4fSRyusuke Konishi return err;
43f183ff4fSRyusuke Konishi }
44f183ff4fSRyusuke Konishi
nilfs_page_mkwrite(struct vm_fault * vmf)45c8ed98cdSSouptick Joarder static vm_fault_t nilfs_page_mkwrite(struct vm_fault *vmf)
46f183ff4fSRyusuke Konishi {
4711bac800SDave Jiang struct vm_area_struct *vma = vmf->vma;
489ff05123SRyusuke Konishi struct page *page = vmf->page;
49496ad9aaSAl Viro struct inode *inode = file_inode(vma->vm_file);
509ff05123SRyusuke Konishi struct nilfs_transaction_info ti;
512c22b337SJan Kara int ret = 0;
529ff05123SRyusuke Konishi
53e3154e97SRyusuke Konishi if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
549ff05123SRyusuke Konishi return VM_FAULT_SIGBUS; /* -ENOSPC */
559ff05123SRyusuke Konishi
562c22b337SJan Kara sb_start_pagefault(inode->i_sb);
579ff05123SRyusuke Konishi lock_page(page);
589ff05123SRyusuke Konishi if (page->mapping != inode->i_mapping ||
599ff05123SRyusuke Konishi page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
609ff05123SRyusuke Konishi unlock_page(page);
612c22b337SJan Kara ret = -EFAULT; /* make the VM retry the fault */
622c22b337SJan Kara goto out;
639ff05123SRyusuke Konishi }
649ff05123SRyusuke Konishi
659ff05123SRyusuke Konishi /*
669ff05123SRyusuke Konishi * check to see if the page is mapped already (no holes)
679ff05123SRyusuke Konishi */
6834094537SRyusuke Konishi if (PageMappedToDisk(page))
699ff05123SRyusuke Konishi goto mapped;
7034094537SRyusuke Konishi
719ff05123SRyusuke Konishi if (page_has_buffers(page)) {
729ff05123SRyusuke Konishi struct buffer_head *bh, *head;
739ff05123SRyusuke Konishi int fully_mapped = 1;
749ff05123SRyusuke Konishi
759ff05123SRyusuke Konishi bh = head = page_buffers(page);
769ff05123SRyusuke Konishi do {
779ff05123SRyusuke Konishi if (!buffer_mapped(bh)) {
789ff05123SRyusuke Konishi fully_mapped = 0;
799ff05123SRyusuke Konishi break;
809ff05123SRyusuke Konishi }
819ff05123SRyusuke Konishi } while (bh = bh->b_this_page, bh != head);
829ff05123SRyusuke Konishi
839ff05123SRyusuke Konishi if (fully_mapped) {
849ff05123SRyusuke Konishi SetPageMappedToDisk(page);
859ff05123SRyusuke Konishi goto mapped;
869ff05123SRyusuke Konishi }
879ff05123SRyusuke Konishi }
889ff05123SRyusuke Konishi unlock_page(page);
899ff05123SRyusuke Konishi
909ff05123SRyusuke Konishi /*
919ff05123SRyusuke Konishi * fill hole blocks
929ff05123SRyusuke Konishi */
939ff05123SRyusuke Konishi ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
949ff05123SRyusuke Konishi /* never returns -ENOMEM, but may return -ENOSPC */
959ff05123SRyusuke Konishi if (unlikely(ret))
962c22b337SJan Kara goto out;
979ff05123SRyusuke Konishi
98041bbb6dSTheodore Ts'o file_update_time(vma->vm_file);
995c500029SRoss Zwisler ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
1002c22b337SJan Kara if (ret) {
1019ff05123SRyusuke Konishi nilfs_transaction_abort(inode->i_sb);
1022c22b337SJan Kara goto out;
1039ff05123SRyusuke Konishi }
10434094537SRyusuke Konishi nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
1059ff05123SRyusuke Konishi nilfs_transaction_commit(inode->i_sb);
1069ff05123SRyusuke Konishi
1079ff05123SRyusuke Konishi mapped:
108*ea5ddbc1SRyusuke Konishi /*
109*ea5ddbc1SRyusuke Konishi * Since checksumming including data blocks is performed to determine
110*ea5ddbc1SRyusuke Konishi * the validity of the log to be written and used for recovery, it is
111*ea5ddbc1SRyusuke Konishi * necessary to wait for writeback to finish here, regardless of the
112*ea5ddbc1SRyusuke Konishi * stable write requirement of the backing device.
113*ea5ddbc1SRyusuke Konishi */
114*ea5ddbc1SRyusuke Konishi wait_on_page_writeback(page);
1152c22b337SJan Kara out:
1162c22b337SJan Kara sb_end_pagefault(inode->i_sb);
1172ba39cc4SChristoph Hellwig return vmf_fs_error(ret);
118f183ff4fSRyusuke Konishi }
119f183ff4fSRyusuke Konishi
120f0f37e2fSAlexey Dobriyan static const struct vm_operations_struct nilfs_file_vm_ops = {
121f183ff4fSRyusuke Konishi .fault = filemap_fault,
122f1820361SKirill A. Shutemov .map_pages = filemap_map_pages,
123f183ff4fSRyusuke Konishi .page_mkwrite = nilfs_page_mkwrite,
124f183ff4fSRyusuke Konishi };
125f183ff4fSRyusuke Konishi
nilfs_file_mmap(struct file * file,struct vm_area_struct * vma)126f183ff4fSRyusuke Konishi static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
127f183ff4fSRyusuke Konishi {
128f183ff4fSRyusuke Konishi file_accessed(file);
129f183ff4fSRyusuke Konishi vma->vm_ops = &nilfs_file_vm_ops;
130f183ff4fSRyusuke Konishi return 0;
131f183ff4fSRyusuke Konishi }
132f183ff4fSRyusuke Konishi
133f183ff4fSRyusuke Konishi /*
134f183ff4fSRyusuke Konishi * We have mostly NULL's here: the current defaults are ok for
135f183ff4fSRyusuke Konishi * the nilfs filesystem.
136f183ff4fSRyusuke Konishi */
137828c0950SAlexey Dobriyan const struct file_operations nilfs_file_operations = {
138f183ff4fSRyusuke Konishi .llseek = generic_file_llseek,
139aad4f8bbSAl Viro .read_iter = generic_file_read_iter,
1408174202bSAl Viro .write_iter = generic_file_write_iter,
1417a946193SRyusuke Konishi .unlocked_ioctl = nilfs_ioctl,
142f183ff4fSRyusuke Konishi #ifdef CONFIG_COMPAT
143828b1c50SRyusuke Konishi .compat_ioctl = nilfs_compat_ioctl,
144f183ff4fSRyusuke Konishi #endif /* CONFIG_COMPAT */
145f183ff4fSRyusuke Konishi .mmap = nilfs_file_mmap,
146f183ff4fSRyusuke Konishi .open = generic_file_open,
147f183ff4fSRyusuke Konishi /* .release = nilfs_release_file, */
148f183ff4fSRyusuke Konishi .fsync = nilfs_sync_file,
1492cb1e089SDavid Howells .splice_read = filemap_splice_read,
150a35d8f01SJoachim Henke .splice_write = iter_file_splice_write,
151f183ff4fSRyusuke Konishi };
152f183ff4fSRyusuke Konishi
1536e1d5dccSAlexey Dobriyan const struct inode_operations nilfs_file_inode_operations = {
154f183ff4fSRyusuke Konishi .setattr = nilfs_setattr,
155f183ff4fSRyusuke Konishi .permission = nilfs_permission,
156622daaffSRyusuke Konishi .fiemap = nilfs_fiemap,
1577c7c436eSMiklos Szeredi .fileattr_get = nilfs_fileattr_get,
1587c7c436eSMiklos Szeredi .fileattr_set = nilfs_fileattr_set,
159f183ff4fSRyusuke Konishi };
160f183ff4fSRyusuke Konishi
161f183ff4fSRyusuke Konishi /* end of file */
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