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fscache: Remove the object list procfile

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Remove the object list procfile from fscache as objects will become
entirely internal to the cache.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/162431198332.2908479.5847286163455099669.stgit@warthog.procyon.org.uk/
This commit is contained in:
David Howells 2021-05-12 09:59:17 +01:00
parent 6ae9bd8bb0
commit 58f386a73f
8 changed files with 0 additions and 443 deletions
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7
fs/fscache/Kconfig
View File

@ -38,10 +38,3 @@ config FSCACHE_DEBUG
enabled by setting bits in /sys/modules/fscache/parameter/debug.
See Documentation/filesystems/caching/fscache.rst for more information.
config FSCACHE_OBJECT_LIST
bool "Maintain global object list for debugging purposes"
depends on FSCACHE && PROC_FS
help
Maintain a global list of active fscache objects that can be
retrieved through /proc/fs/fscache/objects for debugging purposes

1
fs/fscache/Makefile
View File

@ -16,6 +16,5 @@ fscache-y := \
fscache-$(CONFIG_PROC_FS) += proc.o
fscache-$(CONFIG_FSCACHE_STATS) += stats.o
fscache-$(CONFIG_FSCACHE_OBJECT_LIST) += object-list.o
obj-$(CONFIG_FSCACHE) := fscache.o

1
fs/fscache/cache.c
View File

@ -261,7 +261,6 @@ int fscache_add_cache(struct fscache_cache *cache,
spin_lock(&cache->object_list_lock);
list_add_tail(&ifsdef->cache_link, &cache->object_list);
spin_unlock(&cache->object_list_lock);
fscache_objlist_add(ifsdef);
/* add the cache's netfs definition index object to the top level index
* cookie as a known backing object */

2
fs/fscache/cookie.c
View File

@ -620,8 +620,6 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
/* Attach to the cookie. The object already has a ref on it. */
hlist_add_head(&object->cookie_link, &cookie->backing_objects);
fscache_objlist_add(object);
ret = 0;
cant_attach_object:

13
fs/fscache/internal.h
View File

@ -84,19 +84,6 @@ static inline bool fscache_object_congested(void)
*/
extern void fscache_enqueue_object(struct fscache_object *);
/*
* object-list.c
*/
#ifdef CONFIG_FSCACHE_OBJECT_LIST
extern const struct proc_ops fscache_objlist_proc_ops;
extern void fscache_objlist_add(struct fscache_object *);
extern void fscache_objlist_remove(struct fscache_object *);
#else
#define fscache_objlist_add(object) do {} while(0)
#define fscache_objlist_remove(object) do {} while(0)
#endif
/*
* operation.c
*/

414
fs/fscache/object-list.c
View File

@ -1,414 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/* Global fscache object list maintainer and viewer
*
* Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#define FSCACHE_DEBUG_LEVEL COOKIE
#include <linux/module.h>
#include <linux/proc_fs.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"
" | COOKIE 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,
"%08x %08x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %2lx %1x | ",
obj->debug_id,
obj->parent ? obj->parent->debug_id : UINT_MAX,
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 (obj->cookie) {
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, "%08x %-16s %s %3lx %16p",
cookie->debug_id,
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");
} 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 proc_ops fscache_objlist_proc_ops = {
.proc_open = fscache_objlist_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = fscache_objlist_release,
};

2
fs/fscache/object.c
View File

@ -794,8 +794,6 @@ static void fscache_put_object(struct fscache_object *object,
*/
void fscache_object_destroy(struct fscache_object *object)
{
fscache_objlist_remove(object);
/* We can get rid of the cookie now */
fscache_cookie_put(object->cookie, fscache_cookie_put_object);
object->cookie = NULL;

3
include/linux/fscache-cache.h
View File

@ -384,9 +384,6 @@ struct fscache_object {
struct list_head dependents; /* FIFO of dependent objects */
struct list_head dep_link; /* link in parent's dependents list */
struct list_head pending_ops; /* unstarted operations on this object */
#ifdef CONFIG_FSCACHE_OBJECT_LIST
struct rb_node objlist_link; /* link in global object list */
#endif
pgoff_t store_limit; /* current storage limit */
loff_t store_limit_l; /* current storage limit */
};