![Al Viro](/assets/img/avatar_default.png)
it's not needed for file_operations of inodes located on fs defined in the hosting module and for file_operations that go into procfs. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
412 lines
11 KiB
C
412 lines
11 KiB
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 */
|
|
|
|
u8 buf[512]; /* key and aux data buffer */
|
|
};
|
|
|
|
/*
|
|
* 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 *buf = data->buf, *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->def->type) {
|
|
case 0:
|
|
type = "IX";
|
|
break;
|
|
case 1:
|
|
type = "DT";
|
|
break;
|
|
default:
|
|
sprintf(_type, "%02u", cookie->def->type);
|
|
type = _type;
|
|
break;
|
|
}
|
|
|
|
seq_printf(m, "%-16s %s %2lx %16p",
|
|
cookie->def->name,
|
|
type,
|
|
cookie->flags,
|
|
cookie->netfs_data);
|
|
|
|
if (cookie->def->get_key &&
|
|
config & FSCACHE_OBJLIST_CONFIG_KEY)
|
|
keylen = cookie->def->get_key(cookie->netfs_data,
|
|
buf, 400);
|
|
|
|
if (cookie->def->get_aux &&
|
|
config & FSCACHE_OBJLIST_CONFIG_AUX)
|
|
auxlen = cookie->def->get_aux(cookie->netfs_data,
|
|
buf + keylen, 512 - keylen);
|
|
fscache_unuse_cookie(obj);
|
|
|
|
if (keylen > 0 || auxlen > 0) {
|
|
seq_puts(m, " ");
|
|
for (p = buf; keylen > 0; keylen--)
|
|
seq_printf(m, "%02x", *p++);
|
|
if (auxlen > 0) {
|
|
if (config & FSCACHE_OBJLIST_CONFIG_KEY)
|
|
seq_puts(m, ", ");
|
|
for (; auxlen > 0; auxlen--)
|
|
seq_printf(m, "%02x", *p++);
|
|
}
|
|
}
|
|
|
|
seq_puts(m, "\n");
|
|
} 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(key);
|
|
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,
|
|
};
|