blkparse: Fix a potential coredump issue

[blktrace.git] / btt / devs.c

/*
 * blktrace output analysis: generate a timeline & gather statistics
 *
 * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include <stdio.h>
#include "globals.h"

#define N_DEV_HASH	128
#define DEV_HASH(dev)	((MAJOR(dev) ^ MINOR(dev)) & (N_DEV_HASH - 1))
struct list_head	dev_heads[N_DEV_HASH];

static inline void *dip_rb_mkhds(void)
{
	size_t len = N_IOP_TYPES * sizeof(struct rb_root);
	return memset(malloc(len), 0, len);
}

static void __destroy(struct rb_node *n)
{
	if (n) {
		struct io *iop = rb_entry(n, struct io, rb_node);

		__destroy(n->rb_left);
		__destroy(n->rb_right);
		io_release(iop);
	}
}

static void __destroy_heads(struct rb_root *roots)
{
	int i;

	for (i = 0; i < N_IOP_TYPES; i++)
		__destroy(roots[i].rb_node);

	free(roots);
}

void init_dev_heads(void)
{
	int i;
	for (i = 0; i < N_DEV_HASH; i++)
		INIT_LIST_HEAD(&dev_heads[i]);
}

struct d_info *__dip_find(__u32 device)
{
	struct d_info *dip;
	struct list_head *p;

	__list_for_each(p, &dev_heads[DEV_HASH(device)]) {
		dip = list_entry(p, struct d_info, hash_head);
		if (device == dip->device)
			return dip;
	}

	return NULL;
}

void __dip_exit(struct d_info *dip)
{
	list_del(&dip->all_head);
	__destroy_heads(dip->heads);
	region_exit(&dip->regions);
	seeki_free(dip->seek_handle);
	seeki_free(dip->q2q_handle);
	aqd_free(dip->aqd_handle);
	plat_free(dip->q2d_plat_handle);
	plat_free(dip->q2c_plat_handle);
	plat_free(dip->d2c_plat_handle);
	p_live_free(dip->p_live_handle);
	bno_dump_free(dip->bno_dump_handle);
	unplug_hist_free(dip->up_hist_handle);
	rstat_free(dip->rstat_handle);
	if (output_all_data)
		q2d_free(dip->q2d_priv);
	if (dip->pit_fp)
		fclose(dip->pit_fp);
	free(dip);
}

void dip_exit(void)
{
	struct list_head *p, *q;

	list_for_each_safe(p, q, &all_devs) {
		struct d_info *dip = list_entry(p, struct d_info, all_head);
		__dip_exit(dip);
	}
}

static inline FILE *open_pit(struct d_info *dip)
{
	FILE *fp;
	char str[272];

	sprintf(str, "%s_pit.dat", dip->dip_name);
	if ((fp = my_fopen(str, "w")) == NULL)
		perror(str);

	return fp;
}

struct d_info *dip_alloc(__u32 device, struct io *iop)
{
	struct d_info *dip = __dip_find(device);

	if (dip == NULL) {
		dip = malloc(sizeof(struct d_info));
		memset(dip, 0, sizeof(*dip));
		dip->device = device;
		dip->devmap = dev_map_find(device);
		dip->last_q = (__u64)-1;
		dip->heads = dip_rb_mkhds();
		region_init(&dip->regions);
		dip->start_time = BIT_TIME(iop->t.time);
		dip->pre_culling = 1;

		mkhandle(dip, dip->dip_name, 256);

		latency_alloc(dip);
		dip->aqd_handle = aqd_alloc(dip);
		dip->bno_dump_handle = bno_dump_alloc(dip);
		dip->up_hist_handle = unplug_hist_alloc(dip);
		dip->seek_handle = seeki_alloc(dip, "_d2d");
		dip->q2q_handle = seeki_alloc(dip, "_q2q");
		dip->q2d_plat_handle = plat_alloc(dip, "_q2d");
		dip->q2c_plat_handle = plat_alloc(dip, "_q2c");
		dip->d2c_plat_handle = plat_alloc(dip, "_d2c");
		dip->rstat_handle = rstat_alloc(dip);
		dip->p_live_handle = p_live_alloc();

		if (per_io_trees)
			dip->pit_fp = open_pit(dip);

		if (output_all_data)
			dip->q2d_priv = q2d_alloc();

		list_add_tail(&dip->hash_head, &dev_heads[DEV_HASH(device)]);
		list_add_tail(&dip->all_head, &all_devs);
		n_devs++;
	}

	if (dip->pre_culling) {
		if (iop->type == IOP_Q || iop->type == IOP_A)
			dip->pre_culling = 0;
		else
			return NULL;
	}

	iop->linked = dip_rb_ins(dip, iop);
	dip->end_time = BIT_TIME(iop->t.time);

	return dip;
}

void iop_rem_dip(struct io *iop)
{
	if (iop->linked) {
		dip_rb_rem(iop);
		iop->linked = 0;
	}
}

void dip_foreach(struct io *iop, enum iop_type type,
		 void (*fnc)(struct io *iop, struct io *this), int rm_after)
{
	if (rm_after) {
		LIST_HEAD(head);
		struct io *this;
		struct list_head *p, *q;

		dip_rb_fe(iop->dip, type, iop, fnc, &head);
		list_for_each_safe(p, q, &head) {
			this = list_entry(p, struct io, f_head);
			list_del(&this->f_head);
			io_release(this);
		}
	} else
		dip_rb_fe(iop->dip, type, iop, fnc, NULL);
}

void dip_foreach_list(struct io *iop, enum iop_type type, struct list_head *hd)
{
	dip_rb_fe(iop->dip, type, iop, NULL, hd);
}

struct io *dip_find_sec(struct d_info *dip, enum iop_type type, __u64 sec)
{
	return dip_rb_find_sec(dip, type, sec);
}

void dip_foreach_out(void (*func)(struct d_info *, void *), void *arg)
{
	if (devices == NULL) {
		struct list_head *p;
		__list_for_each(p, &all_devs)
			func(list_entry(p, struct d_info, all_head), arg);
	} else {
		int i;
		struct d_info *dip;
		unsigned int mjr, mnr;
		char *p = devices;

		while (p && ((i = sscanf(p, "%u,%u", &mjr, &mnr)) == 2)) {
			dip = __dip_find((__u32)((mjr << MINORBITS) | mnr));
			func(dip, arg);
			p = strchr(p, ';');
			if (p) p++;
		}
	}
}

void dip_plug(__u32 dev, double cur_time)
{
	struct d_info *dip = __dip_find(dev);

	if (dip && !dip->is_plugged) {
		dip->is_plugged = 1;
		dip->last_plug = cur_time;
	}
}

static inline void unplug(struct d_info *dip, double cur_time)
{
	dip->is_plugged = 0;
	dip->plugged_time += (cur_time - dip->last_plug);
}

void dip_unplug(__u32 dev, double cur_time, __u64 nios_up)
{
	struct d_info *dip = __dip_find(dev);

	if (dip && dip->is_plugged) {
		dip->nplugs++;
		dip->nios_up += nios_up;
		unplug(dip, cur_time);
	}
}

void dip_unplug_tm(__u32 dev, double cur_time, __u64 nios_up)
{
	struct d_info *dip = __dip_find(dev);

	if (dip && dip->is_plugged) {
		dip->nios_upt += nios_up;
		dip->nplugs_t++;
		unplug(dip, cur_time);
	}
}

void dip_cleanup(void)
{
	struct list_head *p, *q;

	list_for_each_safe(p, q, &all_devs) {
		struct d_info *dip = list_entry(p, struct d_info, all_head);

		if (dip->n_qs == 0 && dip->n_ds == 0)
			__dip_exit(dip);
	}
}