Release 4.17 fs/ext2/file.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/ext2/file.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/file.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext2 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by Jakub Jelinek
 *      (jj@sunsite.ms.mff.cuni.cz)
 */

#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/dax.h>
#include <linux/quotaops.h>
#include <linux/iomap.h>
#include <linux/uio.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"

#ifdef CONFIG_FS_DAX


static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
	struct inode *inode = iocb->ki_filp->f_mapping->host;
	ssize_t ret;

	if (!iov_iter_count(to))
		return 0; /* skip atime */

	inode_lock_shared(inode);
	ret = dax_iomap_rw(iocb, to, &ext2_iomap_ops);
	inode_unlock_shared(inode);

	file_accessed(iocb->ki_filp);
	return ret;
}

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Christoph Hellwig
75
98.68%
1
50.00%
Ross Zwisler
1
1.32%
1
50.00%
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76
100.00%
2
100.00%



static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_mapping->host;
	ssize_t ret;

	inode_lock(inode);
	ret = generic_write_checks(iocb, from);
	if (ret <= 0)
		goto out_unlock;
	ret = file_remove_privs(file);
	if (ret)
		goto out_unlock;
	ret = file_update_time(file);
	if (ret)
		goto out_unlock;

	ret = dax_iomap_rw(iocb, from, &ext2_iomap_ops);
	if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
		i_size_write(inode, iocb->ki_pos);
		mark_inode_dirty(inode);
	}

out_unlock:
	inode_unlock(inode);
	if (ret > 0)
		ret = generic_write_sync(iocb, ret);
	return ret;
}

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Christoph Hellwig
157
99.37%
1
50.00%
Ross Zwisler
1
0.63%
1
50.00%
Total
158
100.00%
2
100.00%

/*
 * The lock ordering for ext2 DAX fault paths is:
 *
 * mmap_sem (MM)
 *   sb_start_pagefault (vfs, freeze)
 *     ext2_inode_info->dax_sem
 *       address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX)
 *         ext2_inode_info->truncate_mutex
 *
 * The default page_lock and i_size verification done by non-DAX fault paths
 * is sufficient because ext2 doesn't support hole punching.
 */


static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
{
	struct inode *inode = file_inode(vmf->vma->vm_file);
	struct ext2_inode_info *ei = EXT2_I(inode);
	vm_fault_t ret;

	if (vmf->flags & FAULT_FLAG_WRITE) {
		sb_start_pagefault(inode->i_sb);
		file_update_time(vmf->vma->vm_file);
	}
	down_read(&ei->dax_sem);

	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);

	up_read(&ei->dax_sem);
	if (vmf->flags & FAULT_FLAG_WRITE)
		sb_end_pagefault(inode->i_sb);
	return ret;
}

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Ross Zwisler
85
74.56%
2
22.22%
Matthew Wilcox
15
13.16%
1
11.11%
Dave Jiang
6
5.26%
2
22.22%
Jan Kara
4
3.51%
2
22.22%
Christoph Hellwig
2
1.75%
1
11.11%
Souptick Joarder
2
1.75%
1
11.11%
Total
114
100.00%
9
100.00%


static const struct vm_operations_struct ext2_dax_vm_ops = {
	.fault		= ext2_dax_fault,
	/*
         * .huge_fault is not supported for DAX because allocation in ext2
         * cannot be reliably aligned to huge page sizes and so pmd faults
         * will always fail and fail back to regular faults.
         */
	.page_mkwrite	= ext2_dax_fault,
	.pfn_mkwrite	= ext2_dax_fault,
};



static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	if (!IS_DAX(file_inode(file)))
		return generic_file_mmap(file, vma);

	file_accessed(file);
	vma->vm_ops = &ext2_dax_vm_ops;
	vma->vm_flags |= VM_MIXEDMAP;
	return 0;
}
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Matthew Wilcox
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#else

#define ext2_file_mmap	generic_file_mmap
#endif

/*
 * Called when filp is released. This happens when all file descriptors
 * for a single struct file are closed. Note that different open() calls
 * for the same file yield different struct file structures.
 */


static int ext2_release_file (struct inode * inode, struct file * filp)
{
	if (filp->f_mode & FMODE_WRITE) {
		mutex_lock(&EXT2_I(inode)->truncate_mutex);
		ext2_discard_reservation(inode);
		mutex_unlock(&EXT2_I(inode)->truncate_mutex);
	}
	return 0;
}

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Linus Torvalds (pre-git)
31
55.36%
3
75.00%
Martin J. Bligh
25
44.64%
1
25.00%
Total
56
100.00%
4
100.00%



int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	int ret;
	struct super_block *sb = file->f_mapping->host->i_sb;

	ret = generic_file_fsync(file, start, end, datasync);
	if (ret == -EIO)
		/* We don't really know where the IO error happened... */
		ext2_error(sb, __func__,
			   "detected IO error when writing metadata buffers");
	return ret;
}

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Jan Kara
53
77.94%
1
25.00%
Josef Bacik
10
14.71%
1
25.00%
Christoph Hellwig
5
7.35%
2
50.00%
Total
68
100.00%
4
100.00%



static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
#ifdef CONFIG_FS_DAX
	if (IS_DAX(iocb->ki_filp->f_mapping->host))
		return ext2_dax_read_iter(iocb, to);
#endif
	return generic_file_read_iter(iocb, to);
}

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Christoph Hellwig
50
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1
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50
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1
100.00%



static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
#ifdef CONFIG_FS_DAX
	if (IS_DAX(iocb->ki_filp->f_mapping->host))
		return ext2_dax_write_iter(iocb, from);
#endif
	return generic_file_write_iter(iocb, from);
}

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Christoph Hellwig
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50
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const struct file_operations ext2_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= ext2_file_read_iter,
	.write_iter	= ext2_file_write_iter,
	.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ext2_compat_ioctl,
#endif
	.mmap		= ext2_file_mmap,
	.open		= dquot_file_open,
	.release	= ext2_release_file,
	.fsync		= ext2_fsync,
	.get_unmapped_area = thp_get_unmapped_area,
	.splice_read	= generic_file_splice_read,
	.splice_write	= iter_file_splice_write,
};


const struct inode_operations ext2_file_inode_operations = {
#ifdef CONFIG_EXT2_FS_XATTR
	.listxattr	= ext2_listxattr,
#endif
	.setattr	= ext2_setattr,
	.get_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
	.fiemap		= ext2_fiemap,
};
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Christoph Hellwig
359
44.71%
8
15.09%
Matthew Wilcox
103
12.83%
4
7.55%
Ross Zwisler
90
11.21%
4
7.55%
Jan Kara
62
7.72%
4
7.55%
Linus Torvalds (pre-git)
62
7.72%
8
15.09%
Martin J. Bligh
25
3.11%
1
1.89%
Theodore Y. Ts'o
19
2.37%
2
3.77%
Josef Bacik
15
1.87%
2
3.77%
Andrew Morton
13
1.62%
1
1.89%
David Howells
10
1.25%
1
1.89%
Jens Axboe
7
0.87%
1
1.89%
Dave Jiang
7
0.87%
3
5.66%
Benjamin LaHaise
6
0.75%
1
1.89%
James Morris
5
0.62%
1
1.89%
Toshi Kani
5
0.62%
1
1.89%
Boaz Harrosh
4
0.50%
1
1.89%
Al Viro
3
0.37%
3
5.66%
Arjan van de Ven
2
0.25%
2
3.77%
Souptick Joarder
2
0.25%
1
1.89%
Linus Torvalds
2
0.25%
2
3.77%
Greg Kroah-Hartman
1
0.12%
1
1.89%
Andi Kleen
1
0.12%
1
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53
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Directory: fs/ext2

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