[linux-2.6-block.git] / fs / fscache / object-list.c

/* Global fscache object list maintainer and viewer
 *
 * Copyright (C) 2009 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 Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#define FSCACHE_DEBUG_LEVEL COOKIE
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/key.h>
#include <keys/user-type.h>
#include "internal.h"

static struct rb_root fscache_object_list;
static DEFINE_RWLOCK(fscache_object_list_lock);

struct fscache_objlist_data {
	unsigned long	config;		/* display configuration */
#define FSCACHE_OBJLIST_CONFIG_KEY	0x00000001	/* show object keys */
#define FSCACHE_OBJLIST_CONFIG_AUX	0x00000002	/* show object auxdata */
#define FSCACHE_OBJLIST_CONFIG_COOKIE	0x00000004	/* show objects with cookies */
#define FSCACHE_OBJLIST_CONFIG_NOCOOKIE	0x00000008	/* show objects without cookies */
#define FSCACHE_OBJLIST_CONFIG_BUSY	0x00000010	/* show busy objects */
#define FSCACHE_OBJLIST_CONFIG_IDLE	0x00000020	/* show idle objects */
#define FSCACHE_OBJLIST_CONFIG_PENDWR	0x00000040	/* show objects with pending writes */
#define FSCACHE_OBJLIST_CONFIG_NOPENDWR	0x00000080	/* show objects without pending writes */
#define FSCACHE_OBJLIST_CONFIG_READS	0x00000100	/* show objects with active reads */
#define FSCACHE_OBJLIST_CONFIG_NOREADS	0x00000200	/* show objects without active reads */
#define FSCACHE_OBJLIST_CONFIG_EVENTS	0x00000400	/* show objects with events */
#define FSCACHE_OBJLIST_CONFIG_NOEVENTS	0x00000800	/* show objects without no events */
#define FSCACHE_OBJLIST_CONFIG_WORK	0x00001000	/* show objects with work */
#define FSCACHE_OBJLIST_CONFIG_NOWORK	0x00002000	/* show objects without work */
};

/*
 * Add an object to the object list
 * - we use the address of the fscache_object structure as the key into the
 *   tree
 */
void fscache_objlist_add(struct fscache_object *obj)
{
	struct fscache_object *xobj;
	struct rb_node **p = &fscache_object_list.rb_node, *parent = NULL;

	ASSERT(RB_EMPTY_NODE(&obj->objlist_link));

	write_lock(&fscache_object_list_lock);

	while (*p) {
		parent = *p;
		xobj = rb_entry(parent, struct fscache_object, objlist_link);

		if (obj < xobj)
			p = &(*p)->rb_left;
		else if (obj > xobj)
			p = &(*p)->rb_right;
		else
			BUG();
	}

	rb_link_node(&obj->objlist_link, parent, p);
	rb_insert_color(&obj->objlist_link, &fscache_object_list);

	write_unlock(&fscache_object_list_lock);
}

/*
 * Remove an object from the object list.
 */
void fscache_objlist_remove(struct fscache_object *obj)
{
	if (RB_EMPTY_NODE(&obj->objlist_link))
		return;

	write_lock(&fscache_object_list_lock);

	BUG_ON(RB_EMPTY_ROOT(&fscache_object_list));
	rb_erase(&obj->objlist_link, &fscache_object_list);

	write_unlock(&fscache_object_list_lock);
}

/*
 * find the object in the tree on or after the specified index
 */
static struct fscache_object *fscache_objlist_lookup(loff_t *_pos)
{
	struct fscache_object *pobj, *obj = NULL, *minobj = NULL;
	struct rb_node *p;
	unsigned long pos;

	if (*_pos >= (unsigned long) ERR_PTR(-ENOENT))
		return NULL;
	pos = *_pos;

	/* banners (can't represent line 0 by pos 0 as that would involve
	 * returning a NULL pointer) */
	if (pos == 0)
		return (struct fscache_object *)(long)++(*_pos);
	if (pos < 3)
		return (struct fscache_object *)pos;

	pobj = (struct fscache_object *)pos;
	p = fscache_object_list.rb_node;
	while (p) {
		obj = rb_entry(p, struct fscache_object, objlist_link);
		if (pobj < obj) {
			if (!minobj || minobj > obj)
				minobj = obj;
			p = p->rb_left;
		} else if (pobj > obj) {
			p = p->rb_right;
		} else {
			minobj = obj;
			break;
		}
		obj = NULL;
	}

	if (!minobj)
		*_pos = (unsigned long) ERR_PTR(-ENOENT);
	else if (minobj != obj)
		*_pos = (unsigned long) minobj;
	return minobj;
}

/*
 * set up the iterator to start reading from the first line
 */
static void *fscache_objlist_start(struct seq_file *m, loff_t *_pos)
	__acquires(&fscache_object_list_lock)
{
	read_lock(&fscache_object_list_lock);
	return fscache_objlist_lookup(_pos);
}

/*
 * move to the next line
 */
static void *fscache_objlist_next(struct seq_file *m, void *v, loff_t *_pos)
{
	(*_pos)++;
	return fscache_objlist_lookup(_pos);
}

/*
 * clean up after reading
 */
static void fscache_objlist_stop(struct seq_file *m, void *v)
	__releases(&fscache_object_list_lock)
{
	read_unlock(&fscache_object_list_lock);
}

/*
 * display an object
 */
static int fscache_objlist_show(struct seq_file *m, void *v)
{
	struct fscache_objlist_data *data = m->private;
	struct fscache_object *obj = v;
	struct fscache_cookie *cookie;
	unsigned long config = data->config;
	char _type[3], *type;
	u8 *p;

	if ((unsigned long) v == 1) {
		seq_puts(m, "OBJECT   PARENT   STAT CHLDN OPS OOP IPR EX READS"
			 " EM EV FL S"
			 " | NETFS_COOKIE_DEF TY FL NETFS_DATA");
		if (config & (FSCACHE_OBJLIST_CONFIG_KEY |
			      FSCACHE_OBJLIST_CONFIG_AUX))
			seq_puts(m, "       ");
		if (config & FSCACHE_OBJLIST_CONFIG_KEY)
			seq_puts(m, "OBJECT_KEY");
		if ((config & (FSCACHE_OBJLIST_CONFIG_KEY |
			       FSCACHE_OBJLIST_CONFIG_AUX)) ==
		    (FSCACHE_OBJLIST_CONFIG_KEY | FSCACHE_OBJLIST_CONFIG_AUX))
			seq_puts(m, ", ");
		if (config & FSCACHE_OBJLIST_CONFIG_AUX)
			seq_puts(m, "AUX_DATA");
		seq_puts(m, "\n");
		return 0;
	}

	if ((unsigned long) v == 2) {
		seq_puts(m, "======== ======== ==== ===== === === === == ====="
			 " == == == ="
			 " | ================ == == ================");
		if (config & (FSCACHE_OBJLIST_CONFIG_KEY |
			      FSCACHE_OBJLIST_CONFIG_AUX))
			seq_puts(m, " ================");
		seq_puts(m, "\n");
		return 0;
	}

	/* filter out any unwanted objects */
#define FILTER(criterion, _yes, _no)					\
	do {								\
		unsigned long yes = FSCACHE_OBJLIST_CONFIG_##_yes;	\
		unsigned long no = FSCACHE_OBJLIST_CONFIG_##_no;	\
		if (criterion) {					\
			if (!(config & yes))				\
				return 0;				\
		} else {						\
			if (!(config & no))				\
				return 0;				\
		}							\
	} while(0)

	cookie = obj->cookie;
	if (~config) {
		FILTER(cookie->def,
		       COOKIE, NOCOOKIE);
		FILTER(fscache_object_is_active(obj) ||
		       obj->n_ops != 0 ||
		       obj->n_obj_ops != 0 ||
		       obj->flags ||
		       !list_empty(&obj->dependents),
		       BUSY, IDLE);
		FILTER(test_bit(FSCACHE_OBJECT_PENDING_WRITE, &obj->flags),
		       PENDWR, NOPENDWR);
		FILTER(atomic_read(&obj->n_reads),
		       READS, NOREADS);
		FILTER(obj->events & obj->event_mask,
		       EVENTS, NOEVENTS);
		FILTER(work_busy(&obj->work), WORK, NOWORK);
	}

	seq_printf(m,
		   "%8x %8x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %2lx %1x | ",
		   obj->debug_id,
		   obj->parent ? obj->parent->debug_id : -1,
		   obj->state->short_name,
		   obj->n_children,
		   obj->n_ops,
		   obj->n_obj_ops,
		   obj->n_in_progress,
		   obj->n_exclusive,
		   atomic_read(&obj->n_reads),
		   obj->event_mask,
		   obj->events,
		   obj->flags,
		   work_busy(&obj->work));

	if (fscache_use_cookie(obj)) {
		uint16_t keylen = 0, auxlen = 0;

		switch (cookie->type) {
		case 0:
			type = "IX";
			break;
		case 1:
			type = "DT";
			break;
		default:
			snprintf(_type, sizeof(_type), "%02u",
				 cookie->type);
			type = _type;
			break;
		}

		seq_printf(m, "%-16s %s %2lx %16p",
			   cookie->def->name,
			   type,
			   cookie->flags,
			   cookie->netfs_data);

		if (config & FSCACHE_OBJLIST_CONFIG_KEY)
			keylen = cookie->key_len;

		if (config & FSCACHE_OBJLIST_CONFIG_AUX)
			auxlen = cookie->aux_len;

		if (keylen > 0 || auxlen > 0) {
			seq_puts(m, " ");
			p = keylen <= sizeof(cookie->inline_key) ?
				cookie->inline_key : cookie->key;
			for (; keylen > 0; keylen--)
				seq_printf(m, "%02x", *p++);
			if (auxlen > 0) {
				if (config & FSCACHE_OBJLIST_CONFIG_KEY)
					seq_puts(m, ", ");
				p = auxlen <= sizeof(cookie->inline_aux) ?
					cookie->inline_aux : cookie->aux;
				for (; auxlen > 0; auxlen--)
					seq_printf(m, "%02x", *p++);
			}
		}

		seq_puts(m, "\n");
		fscache_unuse_cookie(obj);
	} else {
		seq_puts(m, "<no_netfs>\n");
	}
	return 0;
}

static const struct seq_operations fscache_objlist_ops = {
	.start		= fscache_objlist_start,
	.stop		= fscache_objlist_stop,
	.next		= fscache_objlist_next,
	.show		= fscache_objlist_show,
};

/*
 * get the configuration for filtering the list
 */
static void fscache_objlist_config(struct fscache_objlist_data *data)
{
#ifdef CONFIG_KEYS
	const struct user_key_payload *confkey;
	unsigned long config;
	struct key *key;
	const char *buf;
	int len;

	key = request_key(&key_type_user, "fscache:objlist", NULL);
	if (IS_ERR(key))
		goto no_config;

	config = 0;
	rcu_read_lock();

	confkey = user_key_payload_rcu(key);
	if (!confkey) {
		/* key was revoked */
		rcu_read_unlock();
		key_put(key);
		goto no_config;
	}

	buf = confkey->data;

	for (len = confkey->datalen - 1; len >= 0; len--) {
		switch (buf[len]) {
		case 'K': config |= FSCACHE_OBJLIST_CONFIG_KEY;		break;
		case 'A': config |= FSCACHE_OBJLIST_CONFIG_AUX;		break;
		case 'C': config |= FSCACHE_OBJLIST_CONFIG_COOKIE;	break;
		case 'c': config |= FSCACHE_OBJLIST_CONFIG_NOCOOKIE;	break;
		case 'B': config |= FSCACHE_OBJLIST_CONFIG_BUSY;	break;
		case 'b': config |= FSCACHE_OBJLIST_CONFIG_IDLE;	break;
		case 'W': config |= FSCACHE_OBJLIST_CONFIG_PENDWR;	break;
		case 'w': config |= FSCACHE_OBJLIST_CONFIG_NOPENDWR;	break;
		case 'R': config |= FSCACHE_OBJLIST_CONFIG_READS;	break;
		case 'r': config |= FSCACHE_OBJLIST_CONFIG_NOREADS;	break;
		case 'S': config |= FSCACHE_OBJLIST_CONFIG_WORK;	break;
		case 's': config |= FSCACHE_OBJLIST_CONFIG_NOWORK;	break;
		}
	}

	rcu_read_unlock();
	key_put(key);

	if (!(config & (FSCACHE_OBJLIST_CONFIG_COOKIE | FSCACHE_OBJLIST_CONFIG_NOCOOKIE)))
	    config   |= FSCACHE_OBJLIST_CONFIG_COOKIE | FSCACHE_OBJLIST_CONFIG_NOCOOKIE;
	if (!(config & (FSCACHE_OBJLIST_CONFIG_BUSY | FSCACHE_OBJLIST_CONFIG_IDLE)))
	    config   |= FSCACHE_OBJLIST_CONFIG_BUSY | FSCACHE_OBJLIST_CONFIG_IDLE;
	if (!(config & (FSCACHE_OBJLIST_CONFIG_PENDWR | FSCACHE_OBJLIST_CONFIG_NOPENDWR)))
	    config   |= FSCACHE_OBJLIST_CONFIG_PENDWR | FSCACHE_OBJLIST_CONFIG_NOPENDWR;
	if (!(config & (FSCACHE_OBJLIST_CONFIG_READS | FSCACHE_OBJLIST_CONFIG_NOREADS)))
	    config   |= FSCACHE_OBJLIST_CONFIG_READS | FSCACHE_OBJLIST_CONFIG_NOREADS;
	if (!(config & (FSCACHE_OBJLIST_CONFIG_EVENTS | FSCACHE_OBJLIST_CONFIG_NOEVENTS)))
	    config   |= FSCACHE_OBJLIST_CONFIG_EVENTS | FSCACHE_OBJLIST_CONFIG_NOEVENTS;
	if (!(config & (FSCACHE_OBJLIST_CONFIG_WORK | FSCACHE_OBJLIST_CONFIG_NOWORK)))
	    config   |= FSCACHE_OBJLIST_CONFIG_WORK | FSCACHE_OBJLIST_CONFIG_NOWORK;

	data->config = config;
	return;

no_config:
#endif
	data->config = ULONG_MAX;
}

/*
 * open "/proc/fs/fscache/objects" to provide a list of active objects
 * - can be configured by a user-defined key added to the caller's keyrings
 */
static int fscache_objlist_open(struct inode *inode, struct file *file)
{
	struct fscache_objlist_data *data;

	data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data));
	if (!data)
		return -ENOMEM;

	/* get the configuration key */
	fscache_objlist_config(data);

	return 0;
}

/*
 * clean up on close
 */
static int fscache_objlist_release(struct inode *inode, struct file *file)
{
	struct seq_file *m = file->private_data;

	kfree(m->private);
	m->private = NULL;
	return seq_release(inode, file);
}

const struct file_operations fscache_objlist_fops = {
	.open		= fscache_objlist_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= fscache_objlist_release,
};
Commit	Line	Data
4fbf4291 DH	1	/* Global fscache object list maintainer and viewer
	2	*
	3	* Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#define FSCACHE_DEBUG_LEVEL COOKIE
	13	#include <linux/module.h>
	14	#include <linux/seq_file.h>
5a0e3ad6	15	#include <linux/slab.h>
4fbf4291 DH	16	#include <linux/key.h>
	17	#include <keys/user-type.h>
	18	#include "internal.h"
	19
	20	static struct rb_root fscache_object_list;
	21	static DEFINE_RWLOCK(fscache_object_list_lock);
	22
	23	struct fscache_objlist_data {
	24	unsigned long config; /* display configuration */
	25	#define FSCACHE_OBJLIST_CONFIG_KEY 0x00000001 /* show object keys */
	26	#define FSCACHE_OBJLIST_CONFIG_AUX 0x00000002 /* show object auxdata */
	27	#define FSCACHE_OBJLIST_CONFIG_COOKIE 0x00000004 /* show objects with cookies */
	28	#define FSCACHE_OBJLIST_CONFIG_NOCOOKIE 0x00000008 /* show objects without cookies */
	29	#define FSCACHE_OBJLIST_CONFIG_BUSY 0x00000010 /* show busy objects */
	30	#define FSCACHE_OBJLIST_CONFIG_IDLE 0x00000020 /* show idle objects */
	31	#define FSCACHE_OBJLIST_CONFIG_PENDWR 0x00000040 /* show objects with pending writes */
	32	#define FSCACHE_OBJLIST_CONFIG_NOPENDWR 0x00000080 /* show objects without pending writes */
	33	#define FSCACHE_OBJLIST_CONFIG_READS 0x00000100 /* show objects with active reads */
	34	#define FSCACHE_OBJLIST_CONFIG_NOREADS 0x00000200 /* show objects without active reads */
	35	#define FSCACHE_OBJLIST_CONFIG_EVENTS 0x00000400 /* show objects with events */
	36	#define FSCACHE_OBJLIST_CONFIG_NOEVENTS 0x00000800 /* show objects without no events */
8b8edefa TH	37	#define FSCACHE_OBJLIST_CONFIG_WORK 0x00001000 /* show objects with work */
8b8edefa TH	38	#define FSCACHE_OBJLIST_CONFIG_NOWORK 0x00002000 /* show objects without work */
4fbf4291 DH	39	};
	40
	41	/*
	42	* Add an object to the object list
	43	* - we use the address of the fscache_object structure as the key into the
	44	* tree
	45	*/
	46	void fscache_objlist_add(struct fscache_object *obj)
	47	{
	48	struct fscache_object *xobj;
	49	struct rb_node *p = &fscache_object_list.rb_node, parent = NULL;
	50
7026f192 DH	51	ASSERT(RB_EMPTY_NODE(&obj->objlist_link));
7026f192 DH	52
4fbf4291 DH	53	write_lock(&fscache_object_list_lock);
	54
	55	while (*p) {
	56	parent = *p;
	57	xobj = rb_entry(parent, struct fscache_object, objlist_link);
	58
	59	if (obj < xobj)
	60	p = &(*p)->rb_left;
	61	else if (obj > xobj)
	62	p = &(*p)->rb_right;
	63	else
	64	BUG();
	65	}
	66
	67	rb_link_node(&obj->objlist_link, parent, p);
	68	rb_insert_color(&obj->objlist_link, &fscache_object_list);
	69
	70	write_unlock(&fscache_object_list_lock);
	71	}
	72
1362729b DH	73	/*
1362729b DH	74	* Remove an object from the object list.
4fbf4291	75	*/
1362729b	76	void fscache_objlist_remove(struct fscache_object *obj)
4fbf4291	77	{
7026f192 DH	78	if (RB_EMPTY_NODE(&obj->objlist_link))
	79	return;
	80
4fbf4291 DH	81	write_lock(&fscache_object_list_lock);
	82
	83	BUG_ON(RB_EMPTY_ROOT(&fscache_object_list));
	84	rb_erase(&obj->objlist_link, &fscache_object_list);
	85
	86	write_unlock(&fscache_object_list_lock);
	87	}
4fbf4291 DH	88
	89	/*
	90	* find the object in the tree on or after the specified index
	91	*/
	92	static struct fscache_object fscache_objlist_lookup(loff_t _pos)
	93	{
ea58ceb5	94	struct fscache_object pobj, obj = NULL, *minobj = NULL;
4fbf4291 DH	95	struct rb_node *p;
	96	unsigned long pos;
	97
	98	if (*_pos >= (unsigned long) ERR_PTR(-ENOENT))
	99	return NULL;
	100	pos = *_pos;
	101
	102	/* banners (can't represent line 0 by pos 0 as that would involve
	103	* returning a NULL pointer) */
	104	if (pos == 0)
cc68e3be	105	return (struct fscache_object )(long)++(_pos);
4fbf4291 DH	106	if (pos < 3)
	107	return (struct fscache_object *)pos;
	108
	109	pobj = (struct fscache_object *)pos;
	110	p = fscache_object_list.rb_node;
	111	while (p) {
	112	obj = rb_entry(p, struct fscache_object, objlist_link);
	113	if (pobj < obj) {
	114	if (!minobj \|\| minobj > obj)
	115	minobj = obj;
	116	p = p->rb_left;
	117	} else if (pobj > obj) {
	118	p = p->rb_right;
	119	} else {
	120	minobj = obj;
	121	break;
	122	}
	123	obj = NULL;
	124	}
	125
	126	if (!minobj)
	127	*_pos = (unsigned long) ERR_PTR(-ENOENT);
	128	else if (minobj != obj)
	129	*_pos = (unsigned long) minobj;
	130	return minobj;
	131	}
	132
	133	/*
	134	* set up the iterator to start reading from the first line
	135	*/
	136	static void fscache_objlist_start(struct seq_file m, loff_t *_pos)
	137	__acquires(&fscache_object_list_lock)
	138	{
	139	read_lock(&fscache_object_list_lock);
	140	return fscache_objlist_lookup(_pos);
	141	}
	142
	143	/*
	144	* move to the next line
	145	*/
	146	static void fscache_objlist_next(struct seq_file m, void v, loff_t _pos)
	147	{
	148	(*_pos)++;
	149	return fscache_objlist_lookup(_pos);
	150	}
	151
	152	/*
	153	* clean up after reading
	154	*/
	155	static void fscache_objlist_stop(struct seq_file m, void v)
	156	__releases(&fscache_object_list_lock)
	157	{
	158	read_unlock(&fscache_object_list_lock);
	159	}
	160
	161	/*
	162	* display an object
	163	*/
	164	static int fscache_objlist_show(struct seq_file m, void v)
	165	{
	166	struct fscache_objlist_data *data = m->private;
	167	struct fscache_object *obj = v;
1362729b	168	struct fscache_cookie *cookie;
4fbf4291	169	unsigned long config = data->config;
4fbf4291	170	char _type[3], *type;
402cb8dd	171	u8 *p;
4fbf4291 DH	172
	173	if ((unsigned long) v == 1) {
	174	seq_puts(m, "OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS"
caaef690	175	" EM EV FL S"
4fbf4291 DH	176	" \| NETFS_COOKIE_DEF TY FL NETFS_DATA");
	177	if (config & (FSCACHE_OBJLIST_CONFIG_KEY \|
	178	FSCACHE_OBJLIST_CONFIG_AUX))
	179	seq_puts(m, " ");
	180	if (config & FSCACHE_OBJLIST_CONFIG_KEY)
	181	seq_puts(m, "OBJECT_KEY");
	182	if ((config & (FSCACHE_OBJLIST_CONFIG_KEY \|
	183	FSCACHE_OBJLIST_CONFIG_AUX)) ==
	184	(FSCACHE_OBJLIST_CONFIG_KEY \| FSCACHE_OBJLIST_CONFIG_AUX))
	185	seq_puts(m, ", ");
	186	if (config & FSCACHE_OBJLIST_CONFIG_AUX)
	187	seq_puts(m, "AUX_DATA");
	188	seq_puts(m, "\n");
	189	return 0;
	190	}
	191
	192	if ((unsigned long) v == 2) {
	193	seq_puts(m, "======== ======== ==== ===== === === === == ====="
caaef690	194	" == == == ="
4fbf4291 DH	195	" \| ================ == == ================");
	196	if (config & (FSCACHE_OBJLIST_CONFIG_KEY \|
	197	FSCACHE_OBJLIST_CONFIG_AUX))
	198	seq_puts(m, " ================");
	199	seq_puts(m, "\n");
	200	return 0;
	201	}
	202
	203	/* filter out any unwanted objects */
	204	#define FILTER(criterion, _yes, _no) \
	205	do { \
	206	unsigned long yes = FSCACHE_OBJLIST_CONFIG_##_yes; \
	207	unsigned long no = FSCACHE_OBJLIST_CONFIG_##_no; \
	208	if (criterion) { \
	209	if (!(config & yes)) \
	210	return 0; \
	211	} else { \
	212	if (!(config & no)) \
	213	return 0; \
	214	} \
	215	} while(0)
	216
1362729b	217	cookie = obj->cookie;
4fbf4291	218	if (~config) {
1362729b	219	FILTER(cookie->def,
4fbf4291	220	COOKIE, NOCOOKIE);
caaef690	221	FILTER(fscache_object_is_active(obj) \|\|
4fbf4291 DH	222	obj->n_ops != 0 \|\|
	223	obj->n_obj_ops != 0 \|\|
	224	obj->flags \|\|
	225	!list_empty(&obj->dependents),
	226	BUSY, IDLE);
	227	FILTER(test_bit(FSCACHE_OBJECT_PENDING_WRITE, &obj->flags),
	228	PENDWR, NOPENDWR);
	229	FILTER(atomic_read(&obj->n_reads),
	230	READS, NOREADS);
	231	FILTER(obj->events & obj->event_mask,
	232	EVENTS, NOEVENTS);
8b8edefa	233	FILTER(work_busy(&obj->work), WORK, NOWORK);
4fbf4291 DH	234	}
	235
	236	seq_printf(m,
caaef690	237	"%8x %8x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %2lx %1x \| ",
4fbf4291 DH	238	obj->debug_id,
4fbf4291 DH	239	obj->parent ? obj->parent->debug_id : -1,
caaef690	240	obj->state->short_name,
4fbf4291 DH	241	obj->n_children,
	242	obj->n_ops,
	243	obj->n_obj_ops,
	244	obj->n_in_progress,
	245	obj->n_exclusive,
	246	atomic_read(&obj->n_reads),
c2d35bfe	247	obj->event_mask,
4fbf4291 DH	248	obj->events,
4fbf4291 DH	249	obj->flags,
8b8edefa	250	work_busy(&obj->work));
4fbf4291	251
1362729b DH	252	if (fscache_use_cookie(obj)) {
1362729b DH	253	uint16_t keylen = 0, auxlen = 0;
4fbf4291	254
402cb8dd	255	switch (cookie->type) {
1362729b DH	256	case 0:
	257	type = "IX";
	258	break;
	259	case 1:
	260	type = "DT";
	261	break;
	262	default:
ebfddb3d	263	snprintf(_type, sizeof(_type), "%02u",
402cb8dd	264	cookie->type);
1362729b DH	265	type = _type;
1362729b DH	266	break;
4fbf4291	267	}
4fbf4291	268
1362729b DH	269	seq_printf(m, "%-16s %s %2lx %16p",
	270	cookie->def->name,
	271	type,
	272	cookie->flags,
	273	cookie->netfs_data);
	274
402cb8dd DH	275	if (config & FSCACHE_OBJLIST_CONFIG_KEY)
402cb8dd DH	276	keylen = cookie->key_len;
1362729b	277
402cb8dd DH	278	if (config & FSCACHE_OBJLIST_CONFIG_AUX)
402cb8dd DH	279	auxlen = cookie->aux_len;
1362729b DH	280
1362729b DH	281	if (keylen > 0 \|\| auxlen > 0) {
3185a88c	282	seq_puts(m, " ");
402cb8dd DH	283	p = keylen <= sizeof(cookie->inline_key) ?
	284	cookie->inline_key : cookie->key;
	285	for (; keylen > 0; keylen--)
4fbf4291 DH	286	seq_printf(m, "%02x", *p++);
	287	if (auxlen > 0) {
	288	if (config & FSCACHE_OBJLIST_CONFIG_KEY)
3185a88c	289	seq_puts(m, ", ");
402cb8dd DH	290	p = auxlen <= sizeof(cookie->inline_aux) ?
402cb8dd DH	291	cookie->inline_aux : cookie->aux;
4fbf4291 DH	292	for (; auxlen > 0; auxlen--)
	293	seq_printf(m, "%02x", *p++);
	294	}
	295	}
4fbf4291	296
3185a88c	297	seq_puts(m, "\n");
402cb8dd	298	fscache_unuse_cookie(obj);
1362729b	299	} else {
3185a88c	300	seq_puts(m, "<no_netfs>\n");
1362729b	301	}
4fbf4291 DH	302	return 0;
	303	}
	304
	305	static const struct seq_operations fscache_objlist_ops = {
	306	.start = fscache_objlist_start,
	307	.stop = fscache_objlist_stop,
	308	.next = fscache_objlist_next,
	309	.show = fscache_objlist_show,
	310	};
	311
	312	/*
	313	* get the configuration for filtering the list
	314	*/
	315	static void fscache_objlist_config(struct fscache_objlist_data *data)
	316	{
	317	#ifdef CONFIG_KEYS
146aa8b1	318	const struct user_key_payload *confkey;
4fbf4291 DH	319	unsigned long config;
	320	struct key *key;
	321	const char *buf;
	322	int len;
	323
	324	key = request_key(&key_type_user, "fscache:objlist", NULL);
	325	if (IS_ERR(key))
	326	goto no_config;
	327
	328	config = 0;
	329	rcu_read_lock();
	330
0837e49a	331	confkey = user_key_payload_rcu(key);
d124b2c5 EB	332	if (!confkey) {
	333	/* key was revoked */
	334	rcu_read_unlock();
	335	key_put(key);
	336	goto no_config;
	337	}
	338
4fbf4291 DH	339	buf = confkey->data;
	340
	341	for (len = confkey->datalen - 1; len >= 0; len--) {
	342	switch (buf[len]) {
	343	case 'K': config \|= FSCACHE_OBJLIST_CONFIG_KEY; break;
	344	case 'A': config \|= FSCACHE_OBJLIST_CONFIG_AUX; break;
	345	case 'C': config \|= FSCACHE_OBJLIST_CONFIG_COOKIE; break;
	346	case 'c': config \|= FSCACHE_OBJLIST_CONFIG_NOCOOKIE; break;
	347	case 'B': config \|= FSCACHE_OBJLIST_CONFIG_BUSY; break;
	348	case 'b': config \|= FSCACHE_OBJLIST_CONFIG_IDLE; break;
	349	case 'W': config \|= FSCACHE_OBJLIST_CONFIG_PENDWR; break;
	350	case 'w': config \|= FSCACHE_OBJLIST_CONFIG_NOPENDWR; break;
	351	case 'R': config \|= FSCACHE_OBJLIST_CONFIG_READS; break;
	352	case 'r': config \|= FSCACHE_OBJLIST_CONFIG_NOREADS; break;
	353	case 'S': config \|= FSCACHE_OBJLIST_CONFIG_WORK; break;
	354	case 's': config \|= FSCACHE_OBJLIST_CONFIG_NOWORK; break;
	355	}
	356	}
	357
	358	rcu_read_unlock();
	359	key_put(key);
	360
	361	if (!(config & (FSCACHE_OBJLIST_CONFIG_COOKIE \| FSCACHE_OBJLIST_CONFIG_NOCOOKIE)))
	362	config \|= FSCACHE_OBJLIST_CONFIG_COOKIE \| FSCACHE_OBJLIST_CONFIG_NOCOOKIE;
	363	if (!(config & (FSCACHE_OBJLIST_CONFIG_BUSY \| FSCACHE_OBJLIST_CONFIG_IDLE)))
	364	config \|= FSCACHE_OBJLIST_CONFIG_BUSY \| FSCACHE_OBJLIST_CONFIG_IDLE;
	365	if (!(config & (FSCACHE_OBJLIST_CONFIG_PENDWR \| FSCACHE_OBJLIST_CONFIG_NOPENDWR)))
	366	config \|= FSCACHE_OBJLIST_CONFIG_PENDWR \| FSCACHE_OBJLIST_CONFIG_NOPENDWR;
	367	if (!(config & (FSCACHE_OBJLIST_CONFIG_READS \| FSCACHE_OBJLIST_CONFIG_NOREADS)))
	368	config \|= FSCACHE_OBJLIST_CONFIG_READS \| FSCACHE_OBJLIST_CONFIG_NOREADS;
	369	if (!(config & (FSCACHE_OBJLIST_CONFIG_EVENTS \| FSCACHE_OBJLIST_CONFIG_NOEVENTS)))
	370	config \|= FSCACHE_OBJLIST_CONFIG_EVENTS \| FSCACHE_OBJLIST_CONFIG_NOEVENTS;
	371	if (!(config & (FSCACHE_OBJLIST_CONFIG_WORK \| FSCACHE_OBJLIST_CONFIG_NOWORK)))
	372	config \|= FSCACHE_OBJLIST_CONFIG_WORK \| FSCACHE_OBJLIST_CONFIG_NOWORK;
	373
	374	data->config = config;
	375	return;
	376
	377	no_config:
	378	#endif
	379	data->config = ULONG_MAX;
	380	}
	381
	382	/*
	383	* open "/proc/fs/fscache/objects" to provide a list of active objects
	384	* - can be configured by a user-defined key added to the caller's keyrings
	385	*/
	386	static int fscache_objlist_open(struct inode inode, struct file file)
	387	{
	388	struct fscache_objlist_data *data;
4fbf4291	389
d5d96226 RJ	390	data = __seq_open_private(file, &fscache_objlist_ops, sizeof(*data));
d5d96226 RJ	391	if (!data)
4fbf4291	392	return -ENOMEM;
4fbf4291 DH	393
	394	/* get the configuration key */
	395	fscache_objlist_config(data);
	396
4fbf4291 DH	397	return 0;
	398	}
	399
	400	/*
	401	* clean up on close
	402	*/
	403	static int fscache_objlist_release(struct inode inode, struct file file)
	404	{
	405	struct seq_file *m = file->private_data;
	406
	407	kfree(m->private);
	408	m->private = NULL;
	409	return seq_release(inode, file);
	410	}
	411
	412	const struct file_operations fscache_objlist_fops = {
4fbf4291 DH	413	.open = fscache_objlist_open,
	414	.read = seq_read,
	415	.llseek = seq_lseek,
	416	.release = fscache_objlist_release,
	417	};