Release 4.17 fs/coda/file.c

// SPDX-License-Identifier: GPL-2.0
/*
 * File operations for Coda.
 * Original version: (C) 1996 Peter Braam 
 * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
 *
 * Carnegie Mellon encourages users of this code to contribute improvements
 * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/cred.h>
#include <linux/errno.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include <linux/coda.h>
#include <linux/coda_psdev.h>

#include "coda_linux.h"
#include "coda_int.h"


static ssize_t

coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
	struct file *coda_file = iocb->ki_filp;
	struct coda_file_info *cfi = CODA_FTOC(coda_file);

	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);

	return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos, 0);
}

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Al Viro
23
35.94%
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14.29%
Jan Harkes
19
29.69%
1
14.29%
Linus Torvalds (pre-git)
10
15.62%
2
28.57%
Linus Torvalds
10
15.62%
2
28.57%
Christoph Hellwig
2
3.12%
1
14.29%
Total
64
100.00%
7
100.00%


static ssize_t

coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to)
{
	struct file *coda_file = iocb->ki_filp;
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi = CODA_FTOC(coda_file);
	struct file *host_file;
	ssize_t ret;

	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);

	host_file = cfi->cfi_container;
	file_start_write(host_file);
	inode_lock(coda_inode);
	ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos, 0);
	coda_inode->i_size = file_inode(host_file)->i_size;
	coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
	coda_inode->i_mtime = coda_inode->i_ctime = current_time(coda_inode);
	inode_unlock(coda_inode);
	file_end_write(host_file);
	return ret;
}

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Al Viro
48
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30.00%
2
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Linus Torvalds
27
18.00%
2
14.29%
Linus Torvalds (pre-git)
24
16.00%
4
28.57%
Deepa Dinamani
4
2.67%
1
7.14%
Christoph Hellwig
2
1.33%
1
7.14%
Total
150
100.00%
14
100.00%


static int

coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
{
	struct coda_file_info *cfi;
	struct coda_inode_info *cii;
	struct file *host_file;
	struct inode *coda_inode, *host_inode;

	cfi = CODA_FTOC(coda_file);
	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
	host_file = cfi->cfi_container;

	if (!host_file->f_op->mmap)
		return -ENODEV;

	coda_inode = file_inode(coda_file);
	host_inode = file_inode(host_file);

	cii = ITOC(coda_inode);
	spin_lock(&cii->c_lock);
	coda_file->f_mapping = host_file->f_mapping;
	if (coda_inode->i_mapping == &coda_inode->i_data)
		coda_inode->i_mapping = host_inode->i_mapping;

	/* only allow additional mmaps as long as userspace isn't changing
         * the container file on us! */
	else if (coda_inode->i_mapping != host_inode->i_mapping) {
		spin_unlock(&cii->c_lock);
		return -EBUSY;
	}

	/* keep track of how often the coda_inode/host_file has been mmapped */
	cii->c_mapcount++;
	cfi->cfi_mapcount++;
	spin_unlock(&cii->c_lock);

	return call_mmap(host_file, vma);
}

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Linus Torvalds
47
25.27%
1
14.29%
Yoshihisa Abe
33
17.74%
1
14.29%
Andrew Morton
8
4.30%
1
14.29%
Al Viro
6
3.23%
1
14.29%
Linus Torvalds (pre-git)
2
1.08%
1
14.29%
Miklos Szeredi
1
0.54%
1
14.29%
Total
186
100.00%
7
100.00%



int coda_open(struct inode *coda_inode, struct file *coda_file)
{
	struct file *host_file = NULL;
	int error;
	unsigned short flags = coda_file->f_flags & (~O_EXCL);
	unsigned short coda_flags = coda_flags_to_cflags(flags);
	struct coda_file_info *cfi;

	cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL);
	if (!cfi)
		return -ENOMEM;

	error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags,
			   &host_file);
	if (!host_file)
		error = -EIO;

	if (error) {
		kfree(cfi);
		return error;
	}

	host_file->f_flags |= coda_file->f_flags & (O_APPEND | O_SYNC);

	cfi->cfi_magic = CODA_MAGIC;
	cfi->cfi_mapcount = 0;
	cfi->cfi_container = host_file;

	BUG_ON(coda_file->private_data != NULL);
	coda_file->private_data = cfi;
	return 0;
}

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58
34.73%
1
20.00%
Linus Torvalds (pre-git)
34
20.36%
2
40.00%
Total
167
100.00%
5
100.00%



int coda_release(struct inode *coda_inode, struct file *coda_file)
{
	unsigned short flags = (coda_file->f_flags) & (~O_EXCL);
	unsigned short coda_flags = coda_flags_to_cflags(flags);
	struct coda_file_info *cfi;
	struct coda_inode_info *cii;
	struct inode *host_inode;
	int err;

	cfi = CODA_FTOC(coda_file);
	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);

	err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
			  coda_flags, coda_file->f_cred->fsuid);

	host_inode = file_inode(cfi->cfi_container);
	cii = ITOC(coda_inode);

	/* did we mmap this file? */
	spin_lock(&cii->c_lock);
	if (coda_inode->i_mapping == &host_inode->i_data) {
		cii->c_mapcount -= cfi->cfi_mapcount;
		if (!cii->c_mapcount)
			coda_inode->i_mapping = &coda_inode->i_data;
	}
	spin_unlock(&cii->c_lock);

	fput(cfi->cfi_container);
	kfree(coda_file->private_data);
	coda_file->private_data = NULL;

	/* VFS fput ignores the return value from file_operations->release, so
         * there is no use returning an error here */
	return 0;
}

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100
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1
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Jan Harkes
70
36.46%
3
42.86%
Yoshihisa Abe
16
8.33%
1
14.29%
Al Viro
3
1.56%
1
14.29%
David Howells
3
1.56%
1
14.29%
Total
192
100.00%
7
100.00%



int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync)
{
	struct file *host_file;
	struct inode *coda_inode = file_inode(coda_file);
	struct coda_file_info *cfi;
	int err;

	if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) ||
	      S_ISLNK(coda_inode->i_mode)))
		return -EINVAL;

	err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end);
	if (err)
		return err;
	inode_lock(coda_inode);

	cfi = CODA_FTOC(coda_file);
	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
	host_file = cfi->cfi_container;

	err = vfs_fsync(host_file, datasync);
	if (!err && !datasync)
		err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode));
	inode_unlock(coda_inode);

	return err;
}

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34
21.12%
1
14.29%
Jan Harkes
31
19.25%
1
14.29%
Christoph Hellwig
6
3.73%
2
28.57%
Al Viro
5
3.11%
2
28.57%
Total
161
100.00%
7
100.00%


const struct file_operations coda_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= coda_file_read_iter,
	.write_iter	= coda_file_write_iter,
	.mmap		= coda_file_mmap,
	.open		= coda_open,
	.release	= coda_release,
	.fsync		= coda_fsync,
	.splice_read	= generic_file_splice_read,
};

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334
32.84%
3
7.89%
Linus Torvalds (pre-git)
120
11.80%
5
13.16%
Al Viro
96
9.44%
6
15.79%
Yoshihisa Abe
52
5.11%
1
2.63%
Josef Bacik
34
3.34%
1
2.63%
Christoph Hellwig
10
0.98%
4
10.53%
Andrew Morton
8
0.79%
1
2.63%
Deepa Dinamani
4
0.39%
1
2.63%
Tejun Heo
3
0.29%
1
2.63%
Randy Dunlap
3
0.29%
1
2.63%
David Howells
3
0.29%
1
2.63%
Greg Kroah-Hartman
1
0.10%
1
2.63%
Adrian Bunk
1
0.10%
1
2.63%
Dave Jones
1
0.10%
1
2.63%
Jens Axboe
1
0.10%
1
2.63%
Arjan van de Ven
1
0.10%
1
2.63%
Fabian Frederick
1
0.10%
1
2.63%
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0.10%
1
2.63%
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1017
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38
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Directory: fs/coda

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