Release 4.11 fs/coda/file.c

/*
 * 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);
}

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Al Viro
23
37.10%
1
16.67%
Jan Harkes
19
30.65%
1
16.67%
Linus Torvalds (pre-git)
10
16.13%
2
33.33%
Linus Torvalds
10
16.13%
2
33.33%
Total
62
100.00%
6
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);
	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
32.43%
4
30.77%
Jan Harkes
45
30.41%
2
15.38%
Linus Torvalds
27
18.24%
2
15.38%
Linus Torvalds (pre-git)
24
16.22%
4
30.77%
Deepa Dinamani
4
2.70%
1
7.69%
Total
148
100.00%
13
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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Jan Harkes
89
47.85%
1
14.29%
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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Jan Harkes
75
44.91%
2
33.33%
Linus Torvalds
58
34.73%
1
16.67%
Linus Torvalds (pre-git)
34
20.36%
3
50.00%
Total
167
100.00%
6
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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Linus Torvalds
100
52.08%
1
14.29%
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;
}

Contributors
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CommitProp
Linus Torvalds
85
52.80%
1
14.29%
Josef Bacik
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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Jan Harkes
343
33.89%
6
17.14%
Linus Torvalds
334
33.00%
3
8.57%
Linus Torvalds (pre-git)
120
11.86%
5
14.29%
Al Viro
96
9.49%
6
17.14%
Yoshihisa Abe
52
5.14%
1
2.86%
Josef Bacik
34
3.36%
1
2.86%
Andrew Morton
8
0.79%
1
2.86%
Christoph Hellwig
6
0.59%
2
5.71%
Deepa Dinamani
4
0.40%
1
2.86%
Tejun Heo
3
0.30%
1
2.86%
Randy Dunlap
3
0.30%
1
2.86%
David Howells
3
0.30%
1
2.86%
Dave Jones
1
0.10%
1
2.86%
Arjan van de Ven
1
0.10%
1
2.86%
Fabian Frederick
1
0.10%
1
2.86%
Miklos Szeredi
1
0.10%
1
2.86%
Adrian Bunk
1
0.10%
1
2.86%
Jens Axboe
1
0.10%
1
2.86%
Total
1012
100.00%
35
100.00%
Directory: fs/coda

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