Release 4.10 fs/nilfs2/file.c

/*
 * file.c - NILFS regular file handling primitives including fsync().
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by Amagai Yoshiji and Ryusuke Konishi.
 */

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/writeback.h>
#include "nilfs.h"
#include "segment.h"



int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	/*
         * Called from fsync() system call
         * This is the only entry point that can catch write and synch
         * timing for both data blocks and intermediate blocks.
         *
         * This function should be implemented when the writeback function
         * will be implemented.
         */
	struct the_nilfs *nilfs;
	struct inode *inode = file->f_mapping->host;
	int err = 0;

	if (nilfs_inode_dirty(inode)) {
		if (datasync)
			err = nilfs_construct_dsync_segment(inode->i_sb, inode,
							    start, end);
		else
			err = nilfs_construct_segment(inode->i_sb);
	}

	nilfs = inode->i_sb->s_fs_info;
	if (!err)
		err = nilfs_flush_device(nilfs);

	return err;
}

Contributors
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ryusuke konishi
ryusuke konishi
85
83.33%
3
42.86%
josef bacik
josef bacik
7
6.86%
1
14.29%
andreas rohner
andreas rohner
6
5.88%
2
28.57%
christoph hellwig
christoph hellwig
4
3.92%
1
14.29%
Total
102
100.00%
7
100.00%



static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct page *page = vmf->page;
	struct inode *inode = file_inode(vma->vm_file);
	struct nilfs_transaction_info ti;
	int ret = 0;

	if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
		return VM_FAULT_SIGBUS; /* -ENOSPC */

	sb_start_pagefault(inode->i_sb);
	lock_page(page);
	if (page->mapping != inode->i_mapping ||
	    page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
		unlock_page(page);
		ret = -EFAULT;	/* make the VM retry the fault */
		goto out;
	}

	/*
         * check to see if the page is mapped already (no holes)
         */
	if (PageMappedToDisk(page))
		goto mapped;

	if (page_has_buffers(page)) {
		struct buffer_head *bh, *head;
		int fully_mapped = 1;

		bh = head = page_buffers(page);
		do {
			if (!buffer_mapped(bh)) {
				fully_mapped = 0;
				break;
			}
		} while (bh = bh->b_this_page, bh != head);

		if (fully_mapped) {
			SetPageMappedToDisk(page);
			goto mapped;
		}
	}
	unlock_page(page);

	/*
         * fill hole blocks
         */
	ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
	/* never returns -ENOMEM, but may return -ENOSPC */
	if (unlikely(ret))
		goto out;

	file_update_time(vma->vm_file);
	ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
	if (ret) {
		nilfs_transaction_abort(inode->i_sb);
		goto out;
	}
	nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits));
	nilfs_transaction_commit(inode->i_sb);

 mapped:
	wait_for_stable_page(page);
 out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(ret);
}

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ryusuke konishi
ryusuke konishi
266
84.71%
4
44.44%
jan kara
jan kara
36
11.46%
1
11.11%
theodore tso
theodore tso
7
2.23%
1
11.11%
al viro
al viro
3
0.96%
1
11.11%
darrick j. wong
darrick j. wong
1
0.32%
1
11.11%
ross zwisler
ross zwisler
1
0.32%
1
11.11%
Total
314
100.00%
9
100.00%


static const struct vm_operations_struct nilfs_file_vm_ops = {
	.fault		= filemap_fault,
	.map_pages	= filemap_map_pages,
	.page_mkwrite	= nilfs_page_mkwrite,
};



static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	file_accessed(file);
	vma->vm_ops = &nilfs_file_vm_ops;
	return 0;
}

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ryusuke konishi
ryusuke konishi
31
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1
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31
100.00%
1
100.00%

/*
 * We have mostly NULL's here: the current defaults are ok for
 * the nilfs filesystem.
 */

const struct file_operations nilfs_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.unlocked_ioctl	= nilfs_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= nilfs_compat_ioctl,
#endif	/* CONFIG_COMPAT */
	.mmap		= nilfs_file_mmap,
	.open		= generic_file_open,
	/* .release     = nilfs_release_file, */
	.fsync		= nilfs_sync_file,
	.splice_read	= generic_file_splice_read,
};


const struct inode_operations nilfs_file_inode_operations = {
	.setattr	= nilfs_setattr,
	.permission     = nilfs_permission,
	.fiemap		= nilfs_fiemap,
};

/* end of file */
Overall Contributors
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CommitProp
ryusuke konishi
ryusuke konishi
491
86.29%
10
40.00%
jan kara
jan kara
36
6.33%
1
4.00%
al viro
al viro
7
1.23%
3
12.00%
theodore tso
theodore tso
7
1.23%
1
4.00%
josef bacik
josef bacik
7
1.23%
1
4.00%
andreas rohner
andreas rohner
6
1.05%
2
8.00%
kirill a. shutemov
kirill a. shutemov
5
0.88%
1
4.00%
alexey dobriyan
alexey dobriyan
4
0.70%
3
12.00%
christoph hellwig
christoph hellwig
4
0.70%
1
4.00%
darrick j. wong
darrick j. wong
1
0.18%
1
4.00%
ross zwisler
ross zwisler
1
0.18%
1
4.00%
Total
569
100.00%
25
100.00%
Directory: fs/nilfs2

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