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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c2d35bfe4b
Don't mask off the object event mask when printing it. That way it can be seen if threre are bits set that shouldn't be. Signed-off-by: David Howells <dhowells@redhat.com>
433 lines
12 KiB
C
433 lines
12 KiB
C
/* Global fscache object list maintainer and viewer
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*
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* Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define FSCACHE_DEBUG_LEVEL COOKIE
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/key.h>
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#include <keys/user-type.h>
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#include "internal.h"
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static struct rb_root fscache_object_list;
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static DEFINE_RWLOCK(fscache_object_list_lock);
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struct fscache_objlist_data {
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unsigned long config; /* display configuration */
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#define FSCACHE_OBJLIST_CONFIG_KEY 0x00000001 /* show object keys */
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#define FSCACHE_OBJLIST_CONFIG_AUX 0x00000002 /* show object auxdata */
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#define FSCACHE_OBJLIST_CONFIG_COOKIE 0x00000004 /* show objects with cookies */
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#define FSCACHE_OBJLIST_CONFIG_NOCOOKIE 0x00000008 /* show objects without cookies */
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#define FSCACHE_OBJLIST_CONFIG_BUSY 0x00000010 /* show busy objects */
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#define FSCACHE_OBJLIST_CONFIG_IDLE 0x00000020 /* show idle objects */
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#define FSCACHE_OBJLIST_CONFIG_PENDWR 0x00000040 /* show objects with pending writes */
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#define FSCACHE_OBJLIST_CONFIG_NOPENDWR 0x00000080 /* show objects without pending writes */
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#define FSCACHE_OBJLIST_CONFIG_READS 0x00000100 /* show objects with active reads */
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#define FSCACHE_OBJLIST_CONFIG_NOREADS 0x00000200 /* show objects without active reads */
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#define FSCACHE_OBJLIST_CONFIG_EVENTS 0x00000400 /* show objects with events */
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#define FSCACHE_OBJLIST_CONFIG_NOEVENTS 0x00000800 /* show objects without no events */
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#define FSCACHE_OBJLIST_CONFIG_WORK 0x00001000 /* show objects with work */
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#define FSCACHE_OBJLIST_CONFIG_NOWORK 0x00002000 /* show objects without work */
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u8 buf[512]; /* key and aux data buffer */
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};
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/*
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* Add an object to the object list
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* - we use the address of the fscache_object structure as the key into the
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* tree
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*/
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void fscache_objlist_add(struct fscache_object *obj)
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{
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struct fscache_object *xobj;
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struct rb_node **p = &fscache_object_list.rb_node, *parent = NULL;
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write_lock(&fscache_object_list_lock);
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while (*p) {
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parent = *p;
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xobj = rb_entry(parent, struct fscache_object, objlist_link);
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if (obj < xobj)
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p = &(*p)->rb_left;
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else if (obj > xobj)
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p = &(*p)->rb_right;
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else
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BUG();
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}
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rb_link_node(&obj->objlist_link, parent, p);
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rb_insert_color(&obj->objlist_link, &fscache_object_list);
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write_unlock(&fscache_object_list_lock);
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}
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/**
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* fscache_object_destroy - Note that a cache object is about to be destroyed
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* @object: The object to be destroyed
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*
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* Note the imminent destruction and deallocation of a cache object record.
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*/
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void fscache_object_destroy(struct fscache_object *obj)
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{
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write_lock(&fscache_object_list_lock);
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BUG_ON(RB_EMPTY_ROOT(&fscache_object_list));
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rb_erase(&obj->objlist_link, &fscache_object_list);
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write_unlock(&fscache_object_list_lock);
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}
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EXPORT_SYMBOL(fscache_object_destroy);
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/*
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* find the object in the tree on or after the specified index
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*/
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static struct fscache_object *fscache_objlist_lookup(loff_t *_pos)
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{
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struct fscache_object *pobj, *obj = NULL, *minobj = NULL;
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struct rb_node *p;
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unsigned long pos;
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if (*_pos >= (unsigned long) ERR_PTR(-ENOENT))
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return NULL;
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pos = *_pos;
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/* banners (can't represent line 0 by pos 0 as that would involve
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* returning a NULL pointer) */
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if (pos == 0)
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return (struct fscache_object *)(long)++(*_pos);
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if (pos < 3)
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return (struct fscache_object *)pos;
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pobj = (struct fscache_object *)pos;
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p = fscache_object_list.rb_node;
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while (p) {
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obj = rb_entry(p, struct fscache_object, objlist_link);
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if (pobj < obj) {
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if (!minobj || minobj > obj)
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minobj = obj;
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p = p->rb_left;
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} else if (pobj > obj) {
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p = p->rb_right;
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} else {
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minobj = obj;
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break;
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}
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obj = NULL;
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}
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if (!minobj)
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*_pos = (unsigned long) ERR_PTR(-ENOENT);
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else if (minobj != obj)
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*_pos = (unsigned long) minobj;
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return minobj;
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}
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/*
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* set up the iterator to start reading from the first line
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*/
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static void *fscache_objlist_start(struct seq_file *m, loff_t *_pos)
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__acquires(&fscache_object_list_lock)
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{
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read_lock(&fscache_object_list_lock);
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return fscache_objlist_lookup(_pos);
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}
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/*
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* move to the next line
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*/
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static void *fscache_objlist_next(struct seq_file *m, void *v, loff_t *_pos)
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{
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(*_pos)++;
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return fscache_objlist_lookup(_pos);
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}
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/*
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* clean up after reading
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*/
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static void fscache_objlist_stop(struct seq_file *m, void *v)
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__releases(&fscache_object_list_lock)
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{
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read_unlock(&fscache_object_list_lock);
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}
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/*
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* display an object
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*/
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static int fscache_objlist_show(struct seq_file *m, void *v)
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{
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struct fscache_objlist_data *data = m->private;
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struct fscache_object *obj = v;
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unsigned long config = data->config;
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uint16_t keylen, auxlen;
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char _type[3], *type;
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bool no_cookie;
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u8 *buf = data->buf, *p;
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if ((unsigned long) v == 1) {
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seq_puts(m, "OBJECT PARENT STAT CHLDN OPS OOP IPR EX READS"
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" EM EV F S"
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" | NETFS_COOKIE_DEF TY FL NETFS_DATA");
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if (config & (FSCACHE_OBJLIST_CONFIG_KEY |
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FSCACHE_OBJLIST_CONFIG_AUX))
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seq_puts(m, " ");
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if (config & FSCACHE_OBJLIST_CONFIG_KEY)
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seq_puts(m, "OBJECT_KEY");
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if ((config & (FSCACHE_OBJLIST_CONFIG_KEY |
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FSCACHE_OBJLIST_CONFIG_AUX)) ==
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(FSCACHE_OBJLIST_CONFIG_KEY | FSCACHE_OBJLIST_CONFIG_AUX))
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seq_puts(m, ", ");
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if (config & FSCACHE_OBJLIST_CONFIG_AUX)
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seq_puts(m, "AUX_DATA");
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seq_puts(m, "\n");
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return 0;
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}
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if ((unsigned long) v == 2) {
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seq_puts(m, "======== ======== ==== ===== === === === == ====="
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" == == = ="
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" | ================ == == ================");
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if (config & (FSCACHE_OBJLIST_CONFIG_KEY |
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FSCACHE_OBJLIST_CONFIG_AUX))
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seq_puts(m, " ================");
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seq_puts(m, "\n");
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return 0;
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}
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/* filter out any unwanted objects */
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#define FILTER(criterion, _yes, _no) \
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do { \
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unsigned long yes = FSCACHE_OBJLIST_CONFIG_##_yes; \
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unsigned long no = FSCACHE_OBJLIST_CONFIG_##_no; \
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if (criterion) { \
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if (!(config & yes)) \
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return 0; \
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} else { \
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if (!(config & no)) \
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return 0; \
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} \
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} while(0)
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if (~config) {
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FILTER(obj->cookie,
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COOKIE, NOCOOKIE);
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FILTER(obj->state != FSCACHE_OBJECT_ACTIVE ||
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obj->n_ops != 0 ||
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obj->n_obj_ops != 0 ||
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obj->flags ||
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!list_empty(&obj->dependents),
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BUSY, IDLE);
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FILTER(test_bit(FSCACHE_OBJECT_PENDING_WRITE, &obj->flags),
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PENDWR, NOPENDWR);
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FILTER(atomic_read(&obj->n_reads),
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READS, NOREADS);
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FILTER(obj->events & obj->event_mask,
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EVENTS, NOEVENTS);
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FILTER(work_busy(&obj->work), WORK, NOWORK);
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}
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seq_printf(m,
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"%8x %8x %s %5u %3u %3u %3u %2u %5u %2lx %2lx %1lx %1x | ",
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obj->debug_id,
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obj->parent ? obj->parent->debug_id : -1,
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fscache_object_states_short[obj->state],
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obj->n_children,
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obj->n_ops,
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obj->n_obj_ops,
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obj->n_in_progress,
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obj->n_exclusive,
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atomic_read(&obj->n_reads),
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obj->event_mask,
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obj->events,
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obj->flags,
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work_busy(&obj->work));
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no_cookie = true;
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keylen = auxlen = 0;
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if (obj->cookie) {
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spin_lock(&obj->lock);
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if (obj->cookie) {
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switch (obj->cookie->def->type) {
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case 0:
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type = "IX";
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break;
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case 1:
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type = "DT";
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break;
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default:
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sprintf(_type, "%02u",
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obj->cookie->def->type);
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type = _type;
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break;
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}
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seq_printf(m, "%-16s %s %2lx %16p",
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obj->cookie->def->name,
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type,
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obj->cookie->flags,
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obj->cookie->netfs_data);
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if (obj->cookie->def->get_key &&
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config & FSCACHE_OBJLIST_CONFIG_KEY)
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keylen = obj->cookie->def->get_key(
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obj->cookie->netfs_data,
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buf, 400);
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if (obj->cookie->def->get_aux &&
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config & FSCACHE_OBJLIST_CONFIG_AUX)
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auxlen = obj->cookie->def->get_aux(
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obj->cookie->netfs_data,
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buf + keylen, 512 - keylen);
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no_cookie = false;
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}
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spin_unlock(&obj->lock);
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if (!no_cookie && (keylen > 0 || auxlen > 0)) {
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seq_printf(m, " ");
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for (p = buf; keylen > 0; keylen--)
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seq_printf(m, "%02x", *p++);
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if (auxlen > 0) {
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if (config & FSCACHE_OBJLIST_CONFIG_KEY)
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seq_printf(m, ", ");
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for (; auxlen > 0; auxlen--)
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seq_printf(m, "%02x", *p++);
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}
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}
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}
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if (no_cookie)
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seq_printf(m, "<no_cookie>\n");
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else
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seq_printf(m, "\n");
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return 0;
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}
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static const struct seq_operations fscache_objlist_ops = {
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.start = fscache_objlist_start,
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.stop = fscache_objlist_stop,
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.next = fscache_objlist_next,
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.show = fscache_objlist_show,
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};
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/*
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* get the configuration for filtering the list
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*/
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static void fscache_objlist_config(struct fscache_objlist_data *data)
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{
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#ifdef CONFIG_KEYS
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struct user_key_payload *confkey;
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unsigned long config;
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struct key *key;
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const char *buf;
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int len;
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key = request_key(&key_type_user, "fscache:objlist", NULL);
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if (IS_ERR(key))
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goto no_config;
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config = 0;
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rcu_read_lock();
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confkey = key->payload.data;
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buf = confkey->data;
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for (len = confkey->datalen - 1; len >= 0; len--) {
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switch (buf[len]) {
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case 'K': config |= FSCACHE_OBJLIST_CONFIG_KEY; break;
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case 'A': config |= FSCACHE_OBJLIST_CONFIG_AUX; break;
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case 'C': config |= FSCACHE_OBJLIST_CONFIG_COOKIE; break;
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case 'c': config |= FSCACHE_OBJLIST_CONFIG_NOCOOKIE; break;
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case 'B': config |= FSCACHE_OBJLIST_CONFIG_BUSY; break;
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case 'b': config |= FSCACHE_OBJLIST_CONFIG_IDLE; break;
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case 'W': config |= FSCACHE_OBJLIST_CONFIG_PENDWR; break;
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case 'w': config |= FSCACHE_OBJLIST_CONFIG_NOPENDWR; break;
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case 'R': config |= FSCACHE_OBJLIST_CONFIG_READS; break;
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case 'r': config |= FSCACHE_OBJLIST_CONFIG_NOREADS; break;
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case 'S': config |= FSCACHE_OBJLIST_CONFIG_WORK; break;
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case 's': config |= FSCACHE_OBJLIST_CONFIG_NOWORK; break;
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}
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}
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rcu_read_unlock();
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key_put(key);
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if (!(config & (FSCACHE_OBJLIST_CONFIG_COOKIE | FSCACHE_OBJLIST_CONFIG_NOCOOKIE)))
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config |= FSCACHE_OBJLIST_CONFIG_COOKIE | FSCACHE_OBJLIST_CONFIG_NOCOOKIE;
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if (!(config & (FSCACHE_OBJLIST_CONFIG_BUSY | FSCACHE_OBJLIST_CONFIG_IDLE)))
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config |= FSCACHE_OBJLIST_CONFIG_BUSY | FSCACHE_OBJLIST_CONFIG_IDLE;
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if (!(config & (FSCACHE_OBJLIST_CONFIG_PENDWR | FSCACHE_OBJLIST_CONFIG_NOPENDWR)))
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config |= FSCACHE_OBJLIST_CONFIG_PENDWR | FSCACHE_OBJLIST_CONFIG_NOPENDWR;
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if (!(config & (FSCACHE_OBJLIST_CONFIG_READS | FSCACHE_OBJLIST_CONFIG_NOREADS)))
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config |= FSCACHE_OBJLIST_CONFIG_READS | FSCACHE_OBJLIST_CONFIG_NOREADS;
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if (!(config & (FSCACHE_OBJLIST_CONFIG_EVENTS | FSCACHE_OBJLIST_CONFIG_NOEVENTS)))
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config |= FSCACHE_OBJLIST_CONFIG_EVENTS | FSCACHE_OBJLIST_CONFIG_NOEVENTS;
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if (!(config & (FSCACHE_OBJLIST_CONFIG_WORK | FSCACHE_OBJLIST_CONFIG_NOWORK)))
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config |= FSCACHE_OBJLIST_CONFIG_WORK | FSCACHE_OBJLIST_CONFIG_NOWORK;
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data->config = config;
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return;
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no_config:
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#endif
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data->config = ULONG_MAX;
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}
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/*
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* open "/proc/fs/fscache/objects" to provide a list of active objects
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* - can be configured by a user-defined key added to the caller's keyrings
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*/
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static int fscache_objlist_open(struct inode *inode, struct file *file)
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{
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struct fscache_objlist_data *data;
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struct seq_file *m;
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int ret;
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ret = seq_open(file, &fscache_objlist_ops);
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if (ret < 0)
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return ret;
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m = file->private_data;
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/* buffer for key extraction */
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data = kmalloc(sizeof(struct fscache_objlist_data), GFP_KERNEL);
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if (!data) {
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seq_release(inode, file);
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return -ENOMEM;
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}
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/* get the configuration key */
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fscache_objlist_config(data);
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m->private = data;
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return 0;
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}
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/*
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* clean up on close
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*/
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static int fscache_objlist_release(struct inode *inode, struct file *file)
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{
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struct seq_file *m = file->private_data;
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kfree(m->private);
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m->private = NULL;
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return seq_release(inode, file);
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}
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const struct file_operations fscache_objlist_fops = {
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.owner = THIS_MODULE,
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.open = fscache_objlist_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = fscache_objlist_release,
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};
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