Release 4.16 fs/afs/proc.c

/* /proc interface for AFS
 *
 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include "internal.h"



static inline struct afs_net *afs_proc2net(struct file *f)
{
	return &__afs_net;
}

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David Howells
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2
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18
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2
100.00%



static inline struct afs_net *afs_seq2net(struct seq_file *m)
{
	return &__afs_net; // TODO: use seq_file_net(m)
}

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19
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1
100.00%

static int afs_proc_cells_open(struct inode *inode, struct file *file);
static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
static void afs_proc_cells_stop(struct seq_file *p, void *v);
static int afs_proc_cells_show(struct seq_file *m, void *v);
static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
				    size_t size, loff_t *_pos);


static const struct seq_operations afs_proc_cells_ops = {
	.start	= afs_proc_cells_start,
	.next	= afs_proc_cells_next,
	.stop	= afs_proc_cells_stop,
	.show	= afs_proc_cells_show,
};


static const struct file_operations afs_proc_cells_fops = {
	.open		= afs_proc_cells_open,
	.read		= seq_read,
	.write		= afs_proc_cells_write,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
				      size_t size, loff_t *_pos);
static ssize_t afs_proc_rootcell_write(struct file *file,
				       const char __user *buf,
				       size_t size, loff_t *_pos);


static const struct file_operations afs_proc_rootcell_fops = {
	.read		= afs_proc_rootcell_read,
	.write		= afs_proc_rootcell_write,
	.llseek		= no_llseek,
};

static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
					loff_t *pos);
static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);


static const struct seq_operations afs_proc_cell_volumes_ops = {
	.start	= afs_proc_cell_volumes_start,
	.next	= afs_proc_cell_volumes_next,
	.stop	= afs_proc_cell_volumes_stop,
	.show	= afs_proc_cell_volumes_show,
};


static const struct file_operations afs_proc_cell_volumes_fops = {
	.open		= afs_proc_cell_volumes_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int afs_proc_cell_vlservers_open(struct inode *inode,
					struct file *file);
static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
					  loff_t *pos);
static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);


static const struct seq_operations afs_proc_cell_vlservers_ops = {
	.start	= afs_proc_cell_vlservers_start,
	.next	= afs_proc_cell_vlservers_next,
	.stop	= afs_proc_cell_vlservers_stop,
	.show	= afs_proc_cell_vlservers_show,
};


static const struct file_operations afs_proc_cell_vlservers_fops = {
	.open		= afs_proc_cell_vlservers_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int afs_proc_servers_open(struct inode *inode, struct file *file);
static void *afs_proc_servers_start(struct seq_file *p, loff_t *pos);
static void *afs_proc_servers_next(struct seq_file *p, void *v,
					loff_t *pos);
static void afs_proc_servers_stop(struct seq_file *p, void *v);
static int afs_proc_servers_show(struct seq_file *m, void *v);


static const struct seq_operations afs_proc_servers_ops = {
	.start	= afs_proc_servers_start,
	.next	= afs_proc_servers_next,
	.stop	= afs_proc_servers_stop,
	.show	= afs_proc_servers_show,
};


static const struct file_operations afs_proc_servers_fops = {
	.open		= afs_proc_servers_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*
 * initialise the /proc/fs/afs/ directory
 */


int afs_proc_init(struct afs_net *net)
{
	_enter("");

	net->proc_afs = proc_mkdir("fs/afs", NULL);
	if (!net->proc_afs)
		goto error_dir;

	if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) ||
	    !proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) ||
	    !proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops))
		goto error_tree;

	_leave(" = 0");
	return 0;

error_tree:
	proc_remove(net->proc_afs);
error_dir:
	_leave(" = -ENOMEM");
	return -ENOMEM;
}

Contributors
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David Howells
88
77.19%
4
50.00%
Andrew Morton
10
8.77%
1
12.50%
Denis V. Lunev
8
7.02%
1
12.50%
Al Viro
6
5.26%
1
12.50%
Pali Rohár
2
1.75%
1
12.50%
Total
114
100.00%
8
100.00%

/*
 * clean up the /proc/fs/afs/ directory
 */


void afs_proc_cleanup(struct afs_net *net)
{
	proc_remove(net->proc_afs);
	net->proc_afs = NULL;
}

Contributors
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David Howells
23
100.00%
2
100.00%
Total
23
100.00%
2
100.00%

/*
 * open "/proc/fs/afs/cells" which provides a summary of extant cells
 */


static int afs_proc_cells_open(struct inode *inode, struct file *file)
{
	struct seq_file *m;
	int ret;

	ret = seq_open(file, &afs_proc_cells_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
	m->private = PDE_DATA(inode);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
60
98.36%
1
50.00%
Al Viro
1
1.64%
1
50.00%
Total
61
100.00%
2
100.00%

/*
 * set up the iterator to start reading from the cells list and return the
 * first item
 */


static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
{
	struct afs_net *net = afs_seq2net(m);

	rcu_read_lock();
	return seq_list_start_head(&net->proc_cells, *_pos);
}

Contributors
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Tokens
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David Howells
36
87.80%
3
75.00%
Pavel Emelyanov
5
12.20%
1
25.00%
Total
41
100.00%
4
100.00%

/*
 * move to next cell in cells list
 */


static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct afs_net *net = afs_seq2net(m);

	return seq_list_next(v, &net->proc_cells, pos);
}

Contributors
Person
Tokens
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Commits
CommitProp
David Howells
36
83.72%
2
66.67%
Pavel Emelyanov
7
16.28%
1
33.33%
Total
43
100.00%
3
100.00%

/*
 * clean up after reading from the cells list
 */


static void afs_proc_cells_stop(struct seq_file *m, void *v)
{
	rcu_read_unlock();
}

Contributors
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David Howells
18
100.00%
3
100.00%
Total
18
100.00%
3
100.00%

/*
 * display a header line followed by a load of cell lines
 */


static int afs_proc_cells_show(struct seq_file *m, void *v)
{
	struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
	struct afs_net *net = afs_seq2net(m);

	if (v == &net->proc_cells) {
		/* display header on line 1 */
		seq_puts(m, "USE NAME\n");
		return 0;
	}

	/* display one cell per line on subsequent lines */
	seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
80
94.12%
4
66.67%
Andrew Morton
4
4.71%
1
16.67%
Pavel Emelyanov
1
1.18%
1
16.67%
Total
85
100.00%
6
100.00%

/*
 * handle writes to /proc/fs/afs/cells
 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
 */


static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
				    size_t size, loff_t *_pos)
{
	struct afs_net *net = afs_proc2net(file);
	char *kbuf, *name, *args;
	int ret;

	/* start by dragging the command into memory */
	if (size <= 1 || size >= PAGE_SIZE)
		return -EINVAL;

	kbuf = memdup_user_nul(buf, size);
	if (IS_ERR(kbuf))
		return PTR_ERR(kbuf);

	/* trim to first NL */
	name = memchr(kbuf, '\n', size);
	if (name)
		*name = 0;

	/* split into command, name and argslist */
	name = strchr(kbuf, ' ');
	if (!name)
		goto inval;
	do {
		*name++ = 0;
	} while(*name == ' ');
	if (!*name)
		goto inval;

	args = strchr(name, ' ');
	if (!args)
		goto inval;
	do {
		*args++ = 0;
	} while(*args == ' ');
	if (!*args)
		goto inval;

	/* determine command to perform */
	_debug("cmd=%s name=%s args=%s", kbuf, name, args);

	if (strcmp(kbuf, "add") == 0) {
		struct afs_cell *cell;

		cell = afs_lookup_cell(net, name, strlen(name), args, true);
		if (IS_ERR(cell)) {
			ret = PTR_ERR(cell);
			goto done;
		}

		set_bit(AFS_CELL_FL_NO_GC, &cell->flags);
		printk("kAFS: Added new cell '%s'\n", name);
	} else {
		goto inval;
	}

	ret = size;

done:
	kfree(kbuf);
	_leave(" = %d", ret);
	return ret;

inval:
	ret = -EINVAL;
	printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
	goto done;
}

Contributors
Person
Tokens
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Commits
CommitProp
David Howells
301
94.65%
5
55.56%
Al Viro
9
2.83%
2
22.22%
Wang Lei
6
1.89%
1
11.11%
Andrew Morton
2
0.63%
1
11.11%
Total
318
100.00%
9
100.00%



static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
				      size_t size, loff_t *_pos)
{
	return 0;
}

Contributors
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Andrew Morton
25
96.15%
1
50.00%
Al Viro
1
3.85%
1
50.00%
Total
26
100.00%
2
100.00%

/*
 * handle writes to /proc/fs/afs/rootcell
 * - to initialize rootcell: echo "cell.name:192.168.231.14"
 */


static ssize_t afs_proc_rootcell_write(struct file *file,
				       const char __user *buf,
				       size_t size, loff_t *_pos)
{
	struct afs_net *net = afs_proc2net(file);
	char *kbuf, *s;
	int ret;

	/* start by dragging the command into memory */
	if (size <= 1 || size >= PAGE_SIZE)
		return -EINVAL;

	kbuf = memdup_user_nul(buf, size);
	if (IS_ERR(kbuf))
		return PTR_ERR(kbuf);

	/* trim to first NL */
	s = memchr(kbuf, '\n', size);
	if (s)
		*s = 0;

	/* determine command to perform */
	_debug("rootcell=%s", kbuf);

	ret = afs_cell_init(net, kbuf);
	if (ret >= 0)
		ret = size;	/* consume everything, always */

	kfree(kbuf);
	_leave(" = %d", ret);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
123
84.83%
1
25.00%
David Howells
12
8.28%
1
25.00%
Al Viro
10
6.90%
2
50.00%
Total
145
100.00%
4
100.00%

/*
 * initialise /proc/fs/afs/<cell>/
 */


int afs_proc_cell_setup(struct afs_net *net, struct afs_cell *cell)
{
	struct proc_dir_entry *dir;

	_enter("%p{%s},%p", cell, cell->name, net->proc_afs);

	dir = proc_mkdir(cell->name, net->proc_afs);
	if (!dir)
		goto error_dir;

	if (!proc_create_data("vlservers", 0, dir,
			      &afs_proc_cell_vlservers_fops, cell) ||
	    !proc_create_data("volumes", 0, dir,
			      &afs_proc_cell_volumes_fops, cell))
		goto error_tree;

	_leave(" = 0");
	return 0;

error_tree:
	remove_proc_subtree(cell->name, net->proc_afs);
error_dir:
	_leave(" = -ENOMEM");
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
97
78.86%
4
57.14%
Al Viro
12
9.76%
1
14.29%
Denis V. Lunev
12
9.76%
1
14.29%
Andrew Morton
2
1.63%
1
14.29%
Total
123
100.00%
7
100.00%

/*
 * remove /proc/fs/afs/<cell>/
 */


void afs_proc_cell_remove(struct afs_net *net, struct afs_cell *cell)
{
	_enter("");

	remove_proc_subtree(cell->name, net->proc_afs);

	_leave("");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
33
91.67%
2
50.00%
Andrew Morton
2
5.56%
1
25.00%
Al Viro
1
2.78%
1
25.00%
Total
36
100.00%
4
100.00%

/*
 * open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
 */


static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
{
	struct afs_cell *cell;
	struct seq_file *m;
	int ret;

	cell = PDE_DATA(inode);
	if (!cell)
		return -ENOENT;

	ret = seq_open(file, &afs_proc_cell_volumes_ops);
	if (ret < 0)
		return ret;

	m = file->private_data;
	m->private = cell;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
73
92.41%
1
33.33%
Andrew Morton
5
6.33%
1
33.33%
Al Viro
1
1.27%
1
33.33%
Total
79
100.00%
3
100.00%

/*
 * set up the iterator to start reading from the cells list and return the
 * first item
 */


static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
{
	struct afs_cell *cell = m->private;

	_enter("cell=%p pos=%Ld", cell, *_pos);

	read_lock(&cell->proc_lock);
	return seq_list_start_head(&cell->proc_volumes, *_pos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
49
89.09%
2
50.00%
Pavel Emelyanov
5
9.09%
1
25.00%
Andrew Morton
1
1.82%
1
25.00%
Total
55
100.00%
4
100.00%

/*
 * move to next cell in cells list
 */


static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
					loff_t *_pos)
{
	struct afs_cell *cell = p->private;

	_enter("cell=%p pos=%Ld", cell, *_pos);
	return seq_list_next(v, &cell->proc_volumes, _pos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
44
84.62%
2
50.00%
Pavel Emelyanov
7
13.46%
1
25.00%
Andrew Morton
1
1.92%
1
25.00%
Total
52
100.00%
4
100.00%

/*
 * clean up after reading from the cells list
 */


static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
{
	struct afs_cell *cell = p->private;

	read_unlock(&cell->proc_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
30
93.75%
2
66.67%
Andrew Morton
2
6.25%
1
33.33%
Total
32
100.00%
3
100.00%


static const char afs_vol_types[3][3] = {
	[AFSVL_RWVOL]	= "RW",
	[AFSVL_ROVOL]	= "RO",
	[AFSVL_BACKVOL]	= "BK",
};

/*
 * display a header line followed by a load of volume lines
 */


static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
{
	struct afs_cell *cell = m->private;
	struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);

	/* Display header on line 1 */
	if (v == &cell->proc_volumes) {
		seq_puts(m, "USE VID      TY\n");
		return 0;
	}

	seq_printf(m, "%3d %08x %s\n",
		   atomic_read(&vol->usage), vol->vid,
		   afs_vol_types[vol->type]);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
76
84.44%
3
60.00%
Pavel Emelyanov
12
13.33%
1
20.00%
Andrew Morton
2
2.22%
1
20.00%
Total
90
100.00%
5
100.00%

/*
 * open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
 * location server
 */


static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
{
	struct afs_cell *cell;
	struct seq_file *m;
	int ret;

	cell = PDE_DATA(inode);
	if (!cell)
		return -ENOENT;

	ret = seq_open(file, &afs_proc_cell_vlservers_ops);
	if (ret<0)
		return ret;

	m = file->private_data;
	m->private = cell;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
73
92.41%
1
33.33%
Andrew Morton
5
6.33%
1
33.33%
Al Viro
1
1.27%
1
33.33%
Total
79
100.00%
3
100.00%

/*
 * set up the iterator to start reading from the cells list and return the
 * first item
 */


static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
{
	struct afs_addr_list *alist;
	struct afs_cell *cell = m->private;
	loff_t pos = *_pos;

	rcu_read_lock();

	alist = rcu_dereference(cell->vl_addrs);

	/* allow for the header line */
	if (!pos)
		return (void *) 1;
	pos--;

	if (!alist || pos >= alist->nr_addrs)
		return NULL;

	return alist->addrs + pos;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
83
97.65%
2
66.67%
Andrew Morton
2
2.35%
1
33.33%
Total
85
100.00%
3
100.00%

/*
 * move to next cell in cells list
 */


static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
					  loff_t *_pos)
{
	struct afs_addr_list *alist;
	struct afs_cell *cell = p->private;
	loff_t pos;

	alist = rcu_dereference(cell->vl_addrs);

	pos = *_pos;
	(*_pos)++;
	if (!alist || pos >= alist->nr_addrs)
		return NULL;

	return alist->addrs + pos;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
76
97.44%
2
66.67%
Andrew Morton
2
2.56%
1
33.33%
Total
78
100.00%
3
100.00%

/*
 * clean up after reading from the cells list
 */


static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
{
	rcu_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
18
100.00%
2
100.00%
Total
18
100.00%
2
100.00%

/*
 * display a header line followed by a load of volume lines
 */


static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
{
	struct sockaddr_rxrpc *addr = v;

	/* display header on line 1 */
	if (v == (void *)1) {
		seq_puts(m, "ADDRESS\n");
		return 0;
	}

	/* display one cell per line on subsequent lines */
	seq_printf(m, "%pISp\n", &addr->transport);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
60
98.36%
2
66.67%
Harvey Harrison
1
1.64%
1
33.33%
Total
61
100.00%
3
100.00%

/*
 * open "/proc/fs/afs/servers" which provides a summary of active
 * servers
 */


static int afs_proc_servers_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &afs_proc_servers_ops);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
25
100.00%
2
100.00%
Total
25
100.00%
2
100.00%

/*
 * Set up the iterator to start reading from the server list and return the
 * first item.
 */


static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
{
	struct afs_net *net = afs_seq2net(m);

	rcu_read_lock();
	return seq_hlist_start_head_rcu(&net->fs_proc, *_pos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
37
90.24%
2
66.67%
Pavel Emelyanov
4
9.76%
1
33.33%
Total
41
100.00%
3
100.00%

/*
 * move to next cell in cells list
 */


static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
{
	struct afs_net *net = afs_seq2net(m);

	return seq_hlist_next_rcu(v, &net->fs_proc, _pos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
37
86.05%
2
66.67%
Pavel Emelyanov
6
13.95%
1
33.33%
Total
43
100.00%
3
100.00%

/*
 * clean up after reading from the cells list
 */


static void afs_proc_servers_stop(struct seq_file *p, void *v)
{
	rcu_read_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
18
100.00%
2
100.00%
Total
18
100.00%
2
100.00%

/*
 * display a header line followed by a load of volume lines
 */


static int afs_proc_servers_show(struct seq_file *m, void *v)
{
	struct afs_server *server;
	struct afs_addr_list *alist;

	if (v == SEQ_START_TOKEN) {
		seq_puts(m, "UUID                                 USE ADDR\n");
		return 0;
	}

	server = list_entry(v, struct afs_server, proc_link);
	alist = rcu_dereference(server->addresses);
	seq_printf(m, "%pU %3d %pISp\n",
		   &server->uuid,
		   atomic_read(&server->usage),
		   &alist->addrs[alist->index].transport);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
97
97.98%
2
66.67%
Andrew Morton
2
2.02%
1
33.33%
Total
99
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
2232
84.80%
9
37.50%
Andrew Morton
261
9.92%
1
4.17%
Al Viro
48
1.82%
4
16.67%
Pavel Emelyanov
47
1.79%
1
4.17%
Denis V. Lunev
21
0.80%
1
4.17%
Wang Lei
6
0.23%
1
4.17%
Arjan van de Ven
5
0.19%
1
4.17%
James Morris
4
0.15%
1
4.17%
Alexey Dobriyan
3
0.11%
1
4.17%
Pali Rohár
2
0.08%
1
4.17%
Linus Torvalds
1
0.04%
1
4.17%
Adrian Bunk
1
0.04%
1
4.17%
Harvey Harrison
1
0.04%
1
4.17%
Total
2632
100.00%
24
100.00%
Directory: fs/afs

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