/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * 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 version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2015, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/obdclass/lprocfs_status.c
 *
 * Author: Hariharan Thantry <thantry@users.sourceforge.net>
 */

#define DEBUG_SUBSYSTEM S_CLASS

#include <obd_class.h>
#include <lprocfs_status.h>
#include <uapi/linux/lustre/lustre_idl.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>

static const char * const obd_connect_names[] = {
	"read_only",
	"lov_index",
	"connect_from_mds",
	"write_grant",
	"server_lock",
	"version",
	"request_portal",
	"acl",
	"xattr",
	"create_on_write",
	"truncate_lock",
	"initial_transno",
	"inode_bit_locks",
	"join_file(obsolete)",
	"getattr_by_fid",
	"no_oh_for_devices",
	"remote_client",
	"remote_client_by_force",
	"max_byte_per_rpc",
	"64bit_qdata",
	"mds_capability",
	"oss_capability",
	"early_lock_cancel",
	"som",
	"adaptive_timeouts",
	"lru_resize",
	"mds_mds_connection",
	"real_conn",
	"change_qunit_size",
	"alt_checksum_algorithm",
	"fid_is_enabled",
	"version_recovery",
	"pools",
	"grant_shrink",
	"skip_orphan",
	"large_ea",
	"full20",
	"layout_lock",
	"64bithash",
	"object_max_bytes",
	"imp_recov",
	"jobstats",
	"umask",
	"einprogress",
	"grant_param",
	"flock_owner",
	"lvb_type",
	"nanoseconds_times",
	"lightweight_conn",
	"short_io",
	"pingless",
	"flock_deadlock",
	"disp_stripe",
	"open_by_fid",
	"lfsck",
	"unknown",
	"unlink_close",
	"multi_mod_rpcs",
	"dir_stripe",
	"subtree",
	"lock_ahead",
	"bulk_mbits",
	"compact_obdo",
	"second_flags",
	NULL
};

int obd_connect_flags2str(char *page, int count, __u64 flags, char *sep)
{
	__u64 mask = 1;
	int i, ret = 0;

	for (i = 0; obd_connect_names[i]; i++, mask <<= 1) {
		if (flags & mask)
			ret += snprintf(page + ret, count - ret, "%s%s",
					ret ? sep : "", obd_connect_names[i]);
	}
	if (flags & ~(mask - 1))
		ret += snprintf(page + ret, count - ret,
				"%sunknown flags %#llx",
				ret ? sep : "", flags & ~(mask - 1));
	return ret;
}
EXPORT_SYMBOL(obd_connect_flags2str);

static void obd_connect_data_seqprint(struct seq_file *m,
				      struct obd_connect_data *ocd)
{
	u64 flags;

	LASSERT(ocd);
	flags = ocd->ocd_connect_flags;

	seq_printf(m, "    connect_data:\n"
		   "       flags: %llx\n"
		   "       instance: %u\n",
		   ocd->ocd_connect_flags,
		   ocd->ocd_instance);
	if (flags & OBD_CONNECT_VERSION)
		seq_printf(m, "       target_version: %u.%u.%u.%u\n",
			   OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
			   OBD_OCD_VERSION_MINOR(ocd->ocd_version),
			   OBD_OCD_VERSION_PATCH(ocd->ocd_version),
			   OBD_OCD_VERSION_FIX(ocd->ocd_version));
	if (flags & OBD_CONNECT_MDS)
		seq_printf(m, "       mdt_index: %d\n", ocd->ocd_group);
	if (flags & OBD_CONNECT_GRANT)
		seq_printf(m, "       initial_grant: %d\n", ocd->ocd_grant);
	if (flags & OBD_CONNECT_INDEX)
		seq_printf(m, "       target_index: %u\n", ocd->ocd_index);
	if (flags & OBD_CONNECT_BRW_SIZE)
		seq_printf(m, "       max_brw_size: %d\n", ocd->ocd_brw_size);
	if (flags & OBD_CONNECT_IBITS)
		seq_printf(m, "       ibits_known: %llx\n",
			   ocd->ocd_ibits_known);
	if (flags & OBD_CONNECT_GRANT_PARAM)
		seq_printf(m, "       grant_block_size: %d\n"
			   "       grant_inode_size: %d\n"
			   "       grant_extent_overhead: %d\n",
			   ocd->ocd_blocksize,
			   ocd->ocd_inodespace,
			   ocd->ocd_grant_extent);
	if (flags & OBD_CONNECT_TRANSNO)
		seq_printf(m, "       first_transno: %llx\n",
			   ocd->ocd_transno);
	if (flags & OBD_CONNECT_CKSUM)
		seq_printf(m, "       cksum_types: %#x\n",
			   ocd->ocd_cksum_types);
	if (flags & OBD_CONNECT_MAX_EASIZE)
		seq_printf(m, "       max_easize: %d\n", ocd->ocd_max_easize);
	if (flags & OBD_CONNECT_MAXBYTES)
		seq_printf(m, "       max_object_bytes: %llx\n",
			   ocd->ocd_maxbytes);
	if (flags & OBD_CONNECT_MULTIMODRPCS)
		seq_printf(m, "       max_mod_rpcs: %hu\n",
			   ocd->ocd_maxmodrpcs);
}

int lprocfs_read_frac_helper(char *buffer, unsigned long count, long val,
			     int mult)
{
	long decimal_val, frac_val;
	int prtn;

	if (count < 10)
		return -EINVAL;

	decimal_val = val / mult;
	prtn = snprintf(buffer, count, "%ld", decimal_val);
	frac_val = val % mult;

	if (prtn < (count - 4) && frac_val > 0) {
		long temp_frac;
		int i, temp_mult = 1, frac_bits = 0;

		temp_frac = frac_val * 10;
		buffer[prtn++] = '.';
		while (frac_bits < 2 && (temp_frac / mult) < 1) {
			/* only reserved 2 bits fraction */
			buffer[prtn++] = '0';
			temp_frac *= 10;
			frac_bits++;
		}
		/*
		 * Need to think these cases :
		 *      1. #echo x.00 > /sys/xxx       output result : x
		 *      2. #echo x.0x > /sys/xxx       output result : x.0x
		 *      3. #echo x.x0 > /sys/xxx       output result : x.x
		 *      4. #echo x.xx > /sys/xxx       output result : x.xx
		 *      Only reserved 2 bits fraction.
		 */
		for (i = 0; i < (5 - prtn); i++)
			temp_mult *= 10;

		frac_bits = min((int)count - prtn, 3 - frac_bits);
		prtn += snprintf(buffer + prtn, frac_bits, "%ld",
				 frac_val * temp_mult / mult);

		prtn--;
		while (buffer[prtn] < '1' || buffer[prtn] > '9') {
			prtn--;
			if (buffer[prtn] == '.') {
				prtn--;
				break;
			}
		}
		prtn++;
	}
	buffer[prtn++] = '\n';
	return prtn;
}
EXPORT_SYMBOL(lprocfs_read_frac_helper);

int lprocfs_write_frac_helper(const char __user *buffer, unsigned long count,
			      int *val, int mult)
{
	char kernbuf[20], *end, *pbuf;

	if (count > (sizeof(kernbuf) - 1))
		return -EINVAL;

	if (copy_from_user(kernbuf, buffer, count))
		return -EFAULT;

	kernbuf[count] = '\0';
	pbuf = kernbuf;
	if (*pbuf == '-') {
		mult = -mult;
		pbuf++;
	}

	*val = (int)simple_strtoul(pbuf, &end, 10) * mult;
	if (pbuf == end)
		return -EINVAL;

	if (end && *end == '.') {
		int temp_val, pow = 1;
		int i;

		pbuf = end + 1;
		if (strlen(pbuf) > 5)
			pbuf[5] = '\0'; /*only allow 5bits fractional*/

		temp_val = (int)simple_strtoul(pbuf, &end, 10) * mult;

		if (pbuf < end) {
			for (i = 0; i < (end - pbuf); i++)
				pow *= 10;

			*val += temp_val / pow;
		}
	}
	return 0;
}
EXPORT_SYMBOL(lprocfs_write_frac_helper);

static int lprocfs_no_percpu_stats;
module_param(lprocfs_no_percpu_stats, int, 0644);
MODULE_PARM_DESC(lprocfs_no_percpu_stats, "Do not alloc percpu data for lprocfs stats");

#define MAX_STRING_SIZE 128

int lprocfs_single_release(struct inode *inode, struct file *file)
{
	return single_release(inode, file);
}
EXPORT_SYMBOL(lprocfs_single_release);

int lprocfs_seq_release(struct inode *inode, struct file *file)
{
	return seq_release(inode, file);
}
EXPORT_SYMBOL(lprocfs_seq_release);

/* lprocfs API calls */

struct dentry *ldebugfs_add_simple(struct dentry *root,
				   char *name, void *data,
				   const struct file_operations *fops)
{
	struct dentry *entry;
	umode_t mode = 0;

	if (!root || !name || !fops)
		return ERR_PTR(-EINVAL);

	if (fops->read)
		mode = 0444;
	if (fops->write)
		mode |= 0200;
	entry = debugfs_create_file(name, mode, root, data, fops);
	if (IS_ERR_OR_NULL(entry)) {
		CERROR("LprocFS: No memory to create <debugfs> entry %s\n", name);
		return entry ?: ERR_PTR(-ENOMEM);
	}
	return entry;
}
EXPORT_SYMBOL_GPL(ldebugfs_add_simple);

static const struct file_operations lprocfs_generic_fops = { };

int ldebugfs_add_vars(struct dentry *parent,
		      struct lprocfs_vars *list,
		      void *data)
{
	if (IS_ERR_OR_NULL(parent) || IS_ERR_OR_NULL(list))
		return -EINVAL;

	while (list->name) {
		struct dentry *entry;
		umode_t mode = 0;

		if (list->proc_mode != 0000) {
			mode = list->proc_mode;
		} else if (list->fops) {
			if (list->fops->read)
				mode = 0444;
			if (list->fops->write)
				mode |= 0200;
		}
		entry = debugfs_create_file(list->name, mode, parent,
					    list->data ?: data,
					    list->fops ?: &lprocfs_generic_fops
					   );
		if (IS_ERR_OR_NULL(entry))
			return entry ? PTR_ERR(entry) : -ENOMEM;
		list++;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(ldebugfs_add_vars);

void ldebugfs_remove(struct dentry **entryp)
{
	debugfs_remove_recursive(*entryp);
	*entryp = NULL;
}
EXPORT_SYMBOL_GPL(ldebugfs_remove);

struct dentry *ldebugfs_register(const char *name,
				 struct dentry *parent,
				 struct lprocfs_vars *list, void *data)
{
	struct dentry *entry;

	entry = debugfs_create_dir(name, parent);
	if (IS_ERR_OR_NULL(entry)) {
		entry = entry ?: ERR_PTR(-ENOMEM);
		goto out;
	}

	if (!IS_ERR_OR_NULL(list)) {
		int rc;

		rc = ldebugfs_add_vars(entry, list, data);
		if (rc != 0) {
			debugfs_remove(entry);
			entry = ERR_PTR(rc);
		}
	}
out:
	return entry;
}
EXPORT_SYMBOL_GPL(ldebugfs_register);

/* Generic callbacks */
static ssize_t uuid_show(struct kobject *kobj, struct attribute *attr,
			 char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);

	return sprintf(buf, "%s\n", obd->obd_uuid.uuid);
}
LUSTRE_RO_ATTR(uuid);

static ssize_t blocksize_show(struct kobject *kobj, struct attribute *attr,
			      char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct obd_statfs  osfs;
	int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
			    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
			    OBD_STATFS_NODELAY);
	if (!rc)
		return sprintf(buf, "%u\n", osfs.os_bsize);

	return rc;
}
LUSTRE_RO_ATTR(blocksize);

static ssize_t kbytestotal_show(struct kobject *kobj, struct attribute *attr,
				char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct obd_statfs  osfs;
	int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
			    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
			    OBD_STATFS_NODELAY);
	if (!rc) {
		__u32 blk_size = osfs.os_bsize >> 10;
		__u64 result = osfs.os_blocks;

		while (blk_size >>= 1)
			result <<= 1;

		return sprintf(buf, "%llu\n", result);
	}

	return rc;
}
LUSTRE_RO_ATTR(kbytestotal);

static ssize_t kbytesfree_show(struct kobject *kobj, struct attribute *attr,
			       char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct obd_statfs  osfs;
	int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
			    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
			    OBD_STATFS_NODELAY);
	if (!rc) {
		__u32 blk_size = osfs.os_bsize >> 10;
		__u64 result = osfs.os_bfree;

		while (blk_size >>= 1)
			result <<= 1;

		return sprintf(buf, "%llu\n", result);
	}

	return rc;
}
LUSTRE_RO_ATTR(kbytesfree);

static ssize_t kbytesavail_show(struct kobject *kobj, struct attribute *attr,
				char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct obd_statfs  osfs;
	int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
			    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
			    OBD_STATFS_NODELAY);
	if (!rc) {
		__u32 blk_size = osfs.os_bsize >> 10;
		__u64 result = osfs.os_bavail;

		while (blk_size >>= 1)
			result <<= 1;

		return sprintf(buf, "%llu\n", result);
	}

	return rc;
}
LUSTRE_RO_ATTR(kbytesavail);

static ssize_t filestotal_show(struct kobject *kobj, struct attribute *attr,
			       char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct obd_statfs  osfs;
	int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
			    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
			    OBD_STATFS_NODELAY);
	if (!rc)
		return sprintf(buf, "%llu\n", osfs.os_files);

	return rc;
}
LUSTRE_RO_ATTR(filestotal);

static ssize_t filesfree_show(struct kobject *kobj, struct attribute *attr,
			      char *buf)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct obd_statfs  osfs;
	int rc = obd_statfs(NULL, obd->obd_self_export, &osfs,
			    cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
			    OBD_STATFS_NODELAY);
	if (!rc)
		return sprintf(buf, "%llu\n", osfs.os_ffree);

	return rc;
}
LUSTRE_RO_ATTR(filesfree);

int lprocfs_rd_server_uuid(struct seq_file *m, void *data)
{
	struct obd_device *obd = data;
	struct obd_import *imp;
	char *imp_state_name = NULL;
	int rc;

	LASSERT(obd);
	rc = lprocfs_climp_check(obd);
	if (rc)
		return rc;

	imp = obd->u.cli.cl_import;
	imp_state_name = ptlrpc_import_state_name(imp->imp_state);
	seq_printf(m, "%s\t%s%s\n",
		   obd2cli_tgt(obd), imp_state_name,
		   imp->imp_deactive ? "\tDEACTIVATED" : "");

	up_read(&obd->u.cli.cl_sem);

	return 0;
}
EXPORT_SYMBOL(lprocfs_rd_server_uuid);

int lprocfs_rd_conn_uuid(struct seq_file *m, void *data)
{
	struct obd_device *obd = data;
	struct ptlrpc_connection *conn;
	int rc;

	LASSERT(obd);

	rc = lprocfs_climp_check(obd);
	if (rc)
		return rc;

	conn = obd->u.cli.cl_import->imp_connection;
	if (conn && obd->u.cli.cl_import)
		seq_printf(m, "%s\n", conn->c_remote_uuid.uuid);
	else
		seq_puts(m, "<none>\n");

	up_read(&obd->u.cli.cl_sem);

	return 0;
}
EXPORT_SYMBOL(lprocfs_rd_conn_uuid);

/**
 * Lock statistics structure for access, possibly only on this CPU.
 *
 * The statistics struct may be allocated with per-CPU structures for
 * efficient concurrent update (usually only on server-wide stats), or
 * as a single global struct (e.g. for per-client or per-job statistics),
 * so the required locking depends on the type of structure allocated.
 *
 * For per-CPU statistics, pin the thread to the current cpuid so that
 * will only access the statistics for that CPU.  If the stats structure
 * for the current CPU has not been allocated (or previously freed),
 * allocate it now.  The per-CPU statistics do not need locking since
 * the thread is pinned to the CPU during update.
 *
 * For global statistics, lock the stats structure to prevent concurrent update.
 *
 * \param[in] stats    statistics structure to lock
 * \param[in] opc      type of operation:
 *                     LPROCFS_GET_SMP_ID: "lock" and return current CPU index
 *                             for incrementing statistics for that CPU
 *                     LPROCFS_GET_NUM_CPU: "lock" and return number of used
 *                             CPU indices to iterate over all indices
 * \param[out] flags   CPU interrupt saved state for IRQ-safe locking
 *
 * \retval cpuid of current thread or number of allocated structs
 * \retval negative on error (only for opc LPROCFS_GET_SMP_ID + per-CPU stats)
 */
int lprocfs_stats_lock(struct lprocfs_stats *stats,
		       enum lprocfs_stats_lock_ops opc,
		       unsigned long *flags)
{
	if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) {
		if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
			spin_lock_irqsave(&stats->ls_lock, *flags);
		else
			spin_lock(&stats->ls_lock);
		return opc == LPROCFS_GET_NUM_CPU ? 1 : 0;
	}

	switch (opc) {
	case LPROCFS_GET_SMP_ID: {
		unsigned int cpuid = get_cpu();

		if (unlikely(!stats->ls_percpu[cpuid])) {
			int rc = lprocfs_stats_alloc_one(stats, cpuid);

			if (rc < 0) {
				put_cpu();
				return rc;
			}
		}
		return cpuid;
	}
	case LPROCFS_GET_NUM_CPU:
		return stats->ls_biggest_alloc_num;
	default:
		LBUG();
	}
}

/**
 * Unlock statistics structure after access.
 *
 * Unlock the lock acquired via lprocfs_stats_lock() for global statistics,
 * or unpin this thread from the current cpuid for per-CPU statistics.
 *
 * This function must be called using the same arguments as used when calling
 * lprocfs_stats_lock() so that the correct operation can be performed.
 *
 * \param[in] stats    statistics structure to unlock
 * \param[in] opc      type of operation (current cpuid or number of structs)
 * \param[in] flags    CPU interrupt saved state for IRQ-safe locking
 */
void lprocfs_stats_unlock(struct lprocfs_stats *stats,
			  enum lprocfs_stats_lock_ops opc,
			  unsigned long *flags)
{
	if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) {
		if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
			spin_unlock_irqrestore(&stats->ls_lock, *flags);
		else
			spin_unlock(&stats->ls_lock);
	} else if (opc == LPROCFS_GET_SMP_ID) {
		put_cpu();
	}
}

/** add up per-cpu counters */
void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
			   struct lprocfs_counter *cnt)
{
	unsigned int			num_entry;
	struct lprocfs_counter		*percpu_cntr;
	int				i;
	unsigned long			flags = 0;

	memset(cnt, 0, sizeof(*cnt));

	if (!stats) {
		/* set count to 1 to avoid divide-by-zero errs in callers */
		cnt->lc_count = 1;
		return;
	}

	cnt->lc_min = LC_MIN_INIT;

	num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);

	for (i = 0; i < num_entry; i++) {
		if (!stats->ls_percpu[i])
			continue;
		percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);

		cnt->lc_count += percpu_cntr->lc_count;
		cnt->lc_sum += percpu_cntr->lc_sum;
		if (percpu_cntr->lc_min < cnt->lc_min)
			cnt->lc_min = percpu_cntr->lc_min;
		if (percpu_cntr->lc_max > cnt->lc_max)
			cnt->lc_max = percpu_cntr->lc_max;
		cnt->lc_sumsquare += percpu_cntr->lc_sumsquare;
	}

	lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
}

/**
 * Append a space separated list of current set flags to str.
 */
#define flag2str(flag, first)						\
	do {								\
		if (imp->imp_##flag)					\
			seq_printf(m, "%s" #flag, first ? "" : ", ");	\
	} while (0)
static int obd_import_flags2str(struct obd_import *imp, struct seq_file *m)
{
	bool first = true;

	if (imp->imp_obd->obd_no_recov) {
		seq_puts(m, "no_recov");
		first = false;
	}

	flag2str(invalid, first);
	first = false;
	flag2str(deactive, first);
	flag2str(replayable, first);
	flag2str(pingable, first);
	return 0;
}

#undef flags2str

static void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, char *sep)
{
	__u64 mask = 1;
	int i;
	bool first = true;

	for (i = 0; obd_connect_names[i]; i++, mask <<= 1) {
		if (flags & mask) {
			seq_printf(m, "%s%s",
				   first ? sep : "", obd_connect_names[i]);
			first = false;
		}
	}
	if (flags & ~(mask - 1))
		seq_printf(m, "%sunknown flags %#llx",
			   first ? sep : "", flags & ~(mask - 1));
}

int lprocfs_rd_import(struct seq_file *m, void *data)
{
	char				nidstr[LNET_NIDSTR_SIZE];
	struct lprocfs_counter		ret;
	struct lprocfs_counter_header	*header;
	struct obd_device		*obd	= data;
	struct obd_import		*imp;
	struct obd_import_conn		*conn;
	struct obd_connect_data *ocd;
	int				j;
	int				k;
	int				rw	= 0;
	int				rc;

	LASSERT(obd);
	rc = lprocfs_climp_check(obd);
	if (rc)
		return rc;

	imp = obd->u.cli.cl_import;
	ocd = &imp->imp_connect_data;

	seq_printf(m, "import:\n"
		   "    name: %s\n"
		   "    target: %s\n"
		   "    state: %s\n"
		   "    instance: %u\n"
		   "    connect_flags: [ ",
		   obd->obd_name,
		   obd2cli_tgt(obd),
		   ptlrpc_import_state_name(imp->imp_state),
		   imp->imp_connect_data.ocd_instance);
	obd_connect_seq_flags2str(m, imp->imp_connect_data.ocd_connect_flags,
				  ", ");
	seq_puts(m, " ]\n");
	obd_connect_data_seqprint(m, ocd);
	seq_puts(m, "    import_flags: [ ");
	obd_import_flags2str(imp, m);

	seq_puts(m,
		 " ]\n"
		 "    connection:\n"
		 "       failover_nids: [ ");
	spin_lock(&imp->imp_lock);
	j = 0;
	list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
		libcfs_nid2str_r(conn->oic_conn->c_peer.nid,
				 nidstr, sizeof(nidstr));
		seq_printf(m, "%s%s", j ? ", " : "", nidstr);
		j++;
	}
	if (imp->imp_connection)
		libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
				 nidstr, sizeof(nidstr));
	else
		strncpy(nidstr, "<none>", sizeof(nidstr));
	seq_printf(m,
		   " ]\n"
		   "       current_connection: %s\n"
		   "       connection_attempts: %u\n"
		   "       generation: %u\n"
		   "       in-progress_invalidations: %u\n",
		   nidstr,
		   imp->imp_conn_cnt,
		   imp->imp_generation,
		   atomic_read(&imp->imp_inval_count));
	spin_unlock(&imp->imp_lock);

	if (!obd->obd_svc_stats)
		goto out_climp;

	header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
	lprocfs_stats_collect(obd->obd_svc_stats, PTLRPC_REQWAIT_CNTR, &ret);
	if (ret.lc_count != 0) {
		/* first argument to do_div MUST be __u64 */
		__u64 sum = ret.lc_sum;

		do_div(sum, ret.lc_count);
		ret.lc_sum = sum;
	} else {
		ret.lc_sum = 0;
	}
	seq_printf(m,
		   "    rpcs:\n"
		   "       inflight: %u\n"
		   "       unregistering: %u\n"
		   "       timeouts: %u\n"
		   "       avg_waittime: %llu %s\n",
		   atomic_read(&imp->imp_inflight),
		   atomic_read(&imp->imp_unregistering),
		   atomic_read(&imp->imp_timeouts),
		   ret.lc_sum, header->lc_units);

	k = 0;
	for (j = 0; j < IMP_AT_MAX_PORTALS; j++) {
		if (imp->imp_at.iat_portal[j] == 0)
			break;
		k = max_t(unsigned int, k,
			  at_get(&imp->imp_at.iat_service_estimate[j]));
	}
	seq_printf(m,
		   "    service_estimates:\n"
		   "       services: %u sec\n"
		   "       network: %u sec\n",
		   k,
		   at_get(&imp->imp_at.iat_net_latency));

	seq_printf(m,
		   "    transactions:\n"
		   "       last_replay: %llu\n"
		   "       peer_committed: %llu\n"
		   "       last_checked: %llu\n",
		   imp->imp_last_replay_transno,
		   imp->imp_peer_committed_transno,
		   imp->imp_last_transno_checked);

	/* avg data rates */
	for (rw = 0; rw <= 1; rw++) {
		lprocfs_stats_collect(obd->obd_svc_stats,
				      PTLRPC_LAST_CNTR + BRW_READ_BYTES + rw,
				      &ret);
		if (ret.lc_sum > 0 && ret.lc_count > 0) {
			/* first argument to do_div MUST be __u64 */
			__u64 sum = ret.lc_sum;

			do_div(sum, ret.lc_count);
			ret.lc_sum = sum;
			seq_printf(m,
				   "    %s_data_averages:\n"
				   "       bytes_per_rpc: %llu\n",
				   rw ? "write" : "read",
				   ret.lc_sum);
		}
		k = (int)ret.lc_sum;
		j = opcode_offset(OST_READ + rw) + EXTRA_MAX_OPCODES;
		header = &obd->obd_svc_stats->ls_cnt_header[j];
		lprocfs_stats_collect(obd->obd_svc_stats, j, &ret);
		if (ret.lc_sum > 0 && ret.lc_count != 0) {
			/* first argument to do_div MUST be __u64 */
			__u64 sum = ret.lc_sum;

			do_div(sum, ret.lc_count);
			ret.lc_sum = sum;
			seq_printf(m,
				   "       %s_per_rpc: %llu\n",
				   header->lc_units, ret.lc_sum);
			j = (int)ret.lc_sum;
			if (j > 0)
				seq_printf(m,
					   "       MB_per_sec: %u.%.02u\n",
					   k / j, (100 * k / j) % 100);
		}
	}

out_climp:
	up_read(&obd->u.cli.cl_sem);
	return 0;
}
EXPORT_SYMBOL(lprocfs_rd_import);

int lprocfs_rd_state(struct seq_file *m, void *data)
{
	struct obd_device *obd = data;
	struct obd_import *imp;
	int j, k, rc;

	LASSERT(obd);
	rc = lprocfs_climp_check(obd);
	if (rc)
		return rc;

	imp = obd->u.cli.cl_import;

	seq_printf(m, "current_state: %s\n",
		   ptlrpc_import_state_name(imp->imp_state));
	seq_puts(m, "state_history:\n");
	k = imp->imp_state_hist_idx;
	for (j = 0; j < IMP_STATE_HIST_LEN; j++) {
		struct import_state_hist *ish =
			&imp->imp_state_hist[(k + j) % IMP_STATE_HIST_LEN];
		if (ish->ish_state == 0)
			continue;
		seq_printf(m, " - [ %lld, %s ]\n", (s64)ish->ish_time,
			   ptlrpc_import_state_name(ish->ish_state));
	}

	up_read(&obd->u.cli.cl_sem);
	return 0;
}
EXPORT_SYMBOL(lprocfs_rd_state);

int lprocfs_at_hist_helper(struct seq_file *m, struct adaptive_timeout *at)
{
	int i;

	for (i = 0; i < AT_BINS; i++)
		seq_printf(m, "%3u ", at->at_hist[i]);
	seq_puts(m, "\n");
	return 0;
}
EXPORT_SYMBOL(lprocfs_at_hist_helper);

/* See also ptlrpc_lprocfs_rd_timeouts */
int lprocfs_rd_timeouts(struct seq_file *m, void *data)
{
	struct obd_device *obd = data;
	struct obd_import *imp;
	unsigned int cur, worst;
	time64_t now, worstt;
	struct dhms ts;
	int i, rc;

	LASSERT(obd);
	rc = lprocfs_climp_check(obd);
	if (rc)
		return rc;

	imp = obd->u.cli.cl_import;

	now = ktime_get_real_seconds();

	/* Some network health info for kicks */
	s2dhms(&ts, now - imp->imp_last_reply_time);
	seq_printf(m, "%-10s : %lld, " DHMS_FMT " ago\n",
		   "last reply", (s64)imp->imp_last_reply_time, DHMS_VARS(&ts));

	cur = at_get(&imp->imp_at.iat_net_latency);
	worst = imp->imp_at.iat_net_latency.at_worst_ever;
	worstt = imp->imp_at.iat_net_latency.at_worst_time;
	s2dhms(&ts, now - worstt);
	seq_printf(m, "%-10s : cur %3u  worst %3u (at %lld, " DHMS_FMT " ago) ",
		   "network", cur, worst, (s64)worstt, DHMS_VARS(&ts));
	lprocfs_at_hist_helper(m, &imp->imp_at.iat_net_latency);

	for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
		if (imp->imp_at.iat_portal[i] == 0)
			break;
		cur = at_get(&imp->imp_at.iat_service_estimate[i]);
		worst = imp->imp_at.iat_service_estimate[i].at_worst_ever;
		worstt = imp->imp_at.iat_service_estimate[i].at_worst_time;
		s2dhms(&ts, now - worstt);
		seq_printf(m, "portal %-2d  : cur %3u  worst %3u (at %lld, "
			   DHMS_FMT " ago) ", imp->imp_at.iat_portal[i],
			   cur, worst, (s64)worstt, DHMS_VARS(&ts));
		lprocfs_at_hist_helper(m, &imp->imp_at.iat_service_estimate[i]);
	}

	up_read(&obd->u.cli.cl_sem);
	return 0;
}
EXPORT_SYMBOL(lprocfs_rd_timeouts);

int lprocfs_rd_connect_flags(struct seq_file *m, void *data)
{
	struct obd_device *obd = data;
	__u64 flags;
	int rc;

	rc = lprocfs_climp_check(obd);
	if (rc)
		return rc;

	flags = obd->u.cli.cl_import->imp_connect_data.ocd_connect_flags;
	seq_printf(m, "flags=%#llx\n", flags);
	obd_connect_seq_flags2str(m, flags, "\n");
	seq_puts(m, "\n");
	up_read(&obd->u.cli.cl_sem);
	return 0;
}
EXPORT_SYMBOL(lprocfs_rd_connect_flags);

static struct attribute *obd_def_attrs[] = {
	&lustre_attr_blocksize.attr,
	&lustre_attr_kbytestotal.attr,
	&lustre_attr_kbytesfree.attr,
	&lustre_attr_kbytesavail.attr,
	&lustre_attr_filestotal.attr,
	&lustre_attr_filesfree.attr,
	&lustre_attr_uuid.attr,
	NULL,
};

static void obd_sysfs_release(struct kobject *kobj)
{
	struct obd_device *obd = container_of(kobj, struct obd_device,
					      obd_kobj);

	complete(&obd->obd_kobj_unregister);
}

static struct kobj_type obd_ktype = {
	.default_attrs	= obd_def_attrs,
	.sysfs_ops	= &lustre_sysfs_ops,
	.release	= obd_sysfs_release,
};

int lprocfs_obd_setup(struct obd_device *obd, struct lprocfs_vars *list,
		      const struct attribute_group *attrs)
{
	int rc = 0;

	init_completion(&obd->obd_kobj_unregister);
	rc = kobject_init_and_add(&obd->obd_kobj, &obd_ktype,
				  obd->obd_type->typ_kobj,
				  "%s", obd->obd_name);
	if (rc)
		return rc;

	if (attrs) {
		rc = sysfs_create_group(&obd->obd_kobj, attrs);
		if (rc) {
			kobject_put(&obd->obd_kobj);
			return rc;
		}
	}

	obd->obd_debugfs_entry = ldebugfs_register(obd->obd_name,
						   obd->obd_type->typ_debugfs_entry,
						   list, obd);
	if (IS_ERR_OR_NULL(obd->obd_debugfs_entry)) {
		rc = obd->obd_debugfs_entry ? PTR_ERR(obd->obd_debugfs_entry)
					    : -ENOMEM;
		CERROR("error %d setting up lprocfs for %s\n",
		       rc, obd->obd_name);
		obd->obd_debugfs_entry = NULL;
	}

	return rc;
}
EXPORT_SYMBOL_GPL(lprocfs_obd_setup);

int lprocfs_obd_cleanup(struct obd_device *obd)
{
	if (!obd)
		return -EINVAL;

	if (!IS_ERR_OR_NULL(obd->obd_debugfs_entry))
		ldebugfs_remove(&obd->obd_debugfs_entry);

	kobject_put(&obd->obd_kobj);
	wait_for_completion(&obd->obd_kobj_unregister);

	return 0;
}
EXPORT_SYMBOL_GPL(lprocfs_obd_cleanup);

int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
{
	struct lprocfs_counter  *cntr;
	unsigned int            percpusize;
	int                     rc = -ENOMEM;
	unsigned long           flags = 0;
	int                     i;

	LASSERT(!stats->ls_percpu[cpuid]);
	LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);

	percpusize = lprocfs_stats_counter_size(stats);
	LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
	if (stats->ls_percpu[cpuid]) {
		rc = 0;
		if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
			if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
				spin_lock_irqsave(&stats->ls_lock, flags);
			else
				spin_lock(&stats->ls_lock);
			if (stats->ls_biggest_alloc_num <= cpuid)
				stats->ls_biggest_alloc_num = cpuid + 1;
			if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
				spin_unlock_irqrestore(&stats->ls_lock, flags);
			else
				spin_unlock(&stats->ls_lock);
		}
		/* initialize the ls_percpu[cpuid] non-zero counter */
		for (i = 0; i < stats->ls_num; ++i) {
			cntr = lprocfs_stats_counter_get(stats, cpuid, i);
			cntr->lc_min = LC_MIN_INIT;
		}
	}
	return rc;
}

struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
					  enum lprocfs_stats_flags flags)
{
	struct lprocfs_stats	*stats;
	unsigned int		num_entry;
	unsigned int		percpusize = 0;
	int			i;

	if (num == 0)
		return NULL;

	if (lprocfs_no_percpu_stats != 0)
		flags |= LPROCFS_STATS_FLAG_NOPERCPU;

	if (flags & LPROCFS_STATS_FLAG_NOPERCPU)
		num_entry = 1;
	else
		num_entry = num_possible_cpus();

	/* alloc percpu pointers for all possible cpu slots */
	LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
	if (!stats)
		return NULL;

	stats->ls_num = num;
	stats->ls_flags = flags;
	spin_lock_init(&stats->ls_lock);

	/* alloc num of counter headers */
	LIBCFS_ALLOC(stats->ls_cnt_header,
		     stats->ls_num * sizeof(struct lprocfs_counter_header));
	if (!stats->ls_cnt_header)
		goto fail;

	if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
		/* contains only one set counters */
		percpusize = lprocfs_stats_counter_size(stats);
		LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
		if (!stats->ls_percpu[0])
			goto fail;
		stats->ls_biggest_alloc_num = 1;
	} else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
		/* alloc all percpu data */
		for (i = 0; i < num_entry; ++i)
			if (lprocfs_stats_alloc_one(stats, i) < 0)
				goto fail;
	}

	return stats;

fail:
	lprocfs_free_stats(&stats);
	return NULL;
}
EXPORT_SYMBOL(lprocfs_alloc_stats);

void lprocfs_free_stats(struct lprocfs_stats **statsh)
{
	struct lprocfs_stats *stats = *statsh;
	unsigned int num_entry;
	unsigned int percpusize;
	unsigned int i;

	if (!stats || stats->ls_num == 0)
		return;
	*statsh = NULL;

	if (stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU)
		num_entry = 1;
	else
		num_entry = num_possible_cpus();

	percpusize = lprocfs_stats_counter_size(stats);
	for (i = 0; i < num_entry; i++)
		if (stats->ls_percpu[i])
			LIBCFS_FREE(stats->ls_percpu[i], percpusize);
	if (stats->ls_cnt_header)
		LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
					sizeof(struct lprocfs_counter_header));
	LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
}
EXPORT_SYMBOL(lprocfs_free_stats);

__u64 lprocfs_stats_collector(struct lprocfs_stats *stats, int idx,
			      enum lprocfs_fields_flags field)
{
	unsigned int i;
	unsigned int  num_cpu;
	unsigned long flags     = 0;
	__u64         ret       = 0;

	LASSERT(stats);

	num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
	for (i = 0; i < num_cpu; i++) {
		if (!stats->ls_percpu[i])
			continue;
		ret += lprocfs_read_helper(
				lprocfs_stats_counter_get(stats, i, idx),
				&stats->ls_cnt_header[idx], stats->ls_flags,
				field);
	}
	lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
	return ret;
}
EXPORT_SYMBOL(lprocfs_stats_collector);

void lprocfs_clear_stats(struct lprocfs_stats *stats)
{
	struct lprocfs_counter		*percpu_cntr;
	int				i;
	int				j;
	unsigned int			num_entry;
	unsigned long			flags = 0;

	num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);

	for (i = 0; i < num_entry; i++) {
		if (!stats->ls_percpu[i])
			continue;
		for (j = 0; j < stats->ls_num; j++) {
			percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
			percpu_cntr->lc_count		= 0;
			percpu_cntr->lc_min		= LC_MIN_INIT;
			percpu_cntr->lc_max		= 0;
			percpu_cntr->lc_sumsquare	= 0;
			percpu_cntr->lc_sum		= 0;
			if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
				percpu_cntr->lc_sum_irq	= 0;
		}
	}

	lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
}
EXPORT_SYMBOL(lprocfs_clear_stats);

static ssize_t lprocfs_stats_seq_write(struct file *file,
				       const char __user *buf,
				       size_t len, loff_t *off)
{
	struct seq_file *seq = file->private_data;
	struct lprocfs_stats *stats = seq->private;

	lprocfs_clear_stats(stats);

	return len;
}

static void *lprocfs_stats_seq_start(struct seq_file *p, loff_t *pos)
{
	struct lprocfs_stats *stats = p->private;

	return (*pos < stats->ls_num) ? pos : NULL;
}

static void lprocfs_stats_seq_stop(struct seq_file *p, void *v)
{
}

static void *lprocfs_stats_seq_next(struct seq_file *p, void *v, loff_t *pos)
{
	(*pos)++;
	return lprocfs_stats_seq_start(p, pos);
}

/* seq file export of one lprocfs counter */
static int lprocfs_stats_seq_show(struct seq_file *p, void *v)
{
	struct lprocfs_stats		*stats	= p->private;
	struct lprocfs_counter_header   *hdr;
	struct lprocfs_counter           ctr;
	int                              idx    = *(loff_t *)v;

	if (idx == 0) {
		struct timespec64 now;

		ktime_get_real_ts64(&now);
		seq_printf(p, "%-25s %llu.%9lu secs.usecs\n",
			   "snapshot_time",
			   (s64)now.tv_sec, (unsigned long)now.tv_nsec);
	}

	hdr = &stats->ls_cnt_header[idx];
	lprocfs_stats_collect(stats, idx, &ctr);

	if (ctr.lc_count != 0) {
		seq_printf(p, "%-25s %lld samples [%s]",
			   hdr->lc_name, ctr.lc_count, hdr->lc_units);

		if ((hdr->lc_config & LPROCFS_CNTR_AVGMINMAX) &&
		    (ctr.lc_count > 0)) {
			seq_printf(p, " %lld %lld %lld",
				   ctr.lc_min, ctr.lc_max, ctr.lc_sum);
			if (hdr->lc_config & LPROCFS_CNTR_STDDEV)
				seq_printf(p, " %lld", ctr.lc_sumsquare);
		}
		seq_putc(p, '\n');
	}

	return 0;
}

static const struct seq_operations lprocfs_stats_seq_sops = {
	.start	= lprocfs_stats_seq_start,
	.stop	= lprocfs_stats_seq_stop,
	.next	= lprocfs_stats_seq_next,
	.show	= lprocfs_stats_seq_show,
};

static int lprocfs_stats_seq_open(struct inode *inode, struct file *file)
{
	struct seq_file *seq;
	int rc;

	rc = seq_open(file, &lprocfs_stats_seq_sops);
	if (rc)
		return rc;

	seq = file->private_data;
	seq->private = inode->i_private;

	return 0;
}

static const struct file_operations lprocfs_stats_seq_fops = {
	.owner   = THIS_MODULE,
	.open    = lprocfs_stats_seq_open,
	.read    = seq_read,
	.write   = lprocfs_stats_seq_write,
	.llseek  = seq_lseek,
	.release = lprocfs_seq_release,
};

int ldebugfs_register_stats(struct dentry *parent, const char *name,
			    struct lprocfs_stats *stats)
{
	struct dentry *entry;

	LASSERT(!IS_ERR_OR_NULL(parent));

	entry = debugfs_create_file(name, 0644, parent, stats,
				    &lprocfs_stats_seq_fops);
	if (IS_ERR_OR_NULL(entry))
		return entry ? PTR_ERR(entry) : -ENOMEM;

	return 0;
}
EXPORT_SYMBOL_GPL(ldebugfs_register_stats);

void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
			  unsigned int conf, const char *name,
			  const char *units)
{
	struct lprocfs_counter_header	*header;
	struct lprocfs_counter		*percpu_cntr;
	unsigned long			flags = 0;
	unsigned int			i;
	unsigned int			num_cpu;

	header = &stats->ls_cnt_header[index];
	LASSERTF(header, "Failed to allocate stats header:[%d]%s/%s\n",
		 index, name, units);

	header->lc_config = conf;
	header->lc_name   = name;
	header->lc_units  = units;

	num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
	for (i = 0; i < num_cpu; ++i) {
		if (!stats->ls_percpu[i])
			continue;
		percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
		percpu_cntr->lc_count		= 0;
		percpu_cntr->lc_min		= LC_MIN_INIT;
		percpu_cntr->lc_max		= 0;
		percpu_cntr->lc_sumsquare	= 0;
		percpu_cntr->lc_sum		= 0;
		if ((stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
			percpu_cntr->lc_sum_irq	= 0;
	}
	lprocfs_stats_unlock(stats, LPROCFS_GET_NUM_CPU, &flags);
}
EXPORT_SYMBOL(lprocfs_counter_init);

int lprocfs_exp_cleanup(struct obd_export *exp)
{
	return 0;
}
EXPORT_SYMBOL(lprocfs_exp_cleanup);

__s64 lprocfs_read_helper(struct lprocfs_counter *lc,
			  struct lprocfs_counter_header *header,
			  enum lprocfs_stats_flags flags,
			  enum lprocfs_fields_flags field)
{
	__s64 ret = 0;

	if (!lc || !header)
		return 0;

	switch (field) {
	case LPROCFS_FIELDS_FLAGS_CONFIG:
		ret = header->lc_config;
		break;
	case LPROCFS_FIELDS_FLAGS_SUM:
		ret = lc->lc_sum;
		if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0)
			ret += lc->lc_sum_irq;
		break;
	case LPROCFS_FIELDS_FLAGS_MIN:
		ret = lc->lc_min;
		break;
	case LPROCFS_FIELDS_FLAGS_MAX:
		ret = lc->lc_max;
		break;
	case LPROCFS_FIELDS_FLAGS_AVG:
		ret = (lc->lc_max - lc->lc_min) / 2;
		break;
	case LPROCFS_FIELDS_FLAGS_SUMSQUARE:
		ret = lc->lc_sumsquare;
		break;
	case LPROCFS_FIELDS_FLAGS_COUNT:
		ret = lc->lc_count;
		break;
	default:
		break;
	}

	return 0;
}
EXPORT_SYMBOL(lprocfs_read_helper);

int lprocfs_write_helper(const char __user *buffer, unsigned long count,
			 int *val)
{
	return lprocfs_write_frac_helper(buffer, count, val, 1);
}
EXPORT_SYMBOL(lprocfs_write_helper);

int lprocfs_write_u64_helper(const char __user *buffer, unsigned long count,
			     __u64 *val)
{
	return lprocfs_write_frac_u64_helper(buffer, count, val, 1);
}
EXPORT_SYMBOL(lprocfs_write_u64_helper);

int lprocfs_write_frac_u64_helper(const char __user *buffer,
				  unsigned long count, __u64 *val, int mult)
{
	char kernbuf[22], *end, *pbuf;
	__u64 whole, frac = 0, units;
	unsigned frac_d = 1;
	int sign = 1;

	if (count > (sizeof(kernbuf) - 1))
		return -EINVAL;

	if (copy_from_user(kernbuf, buffer, count))
		return -EFAULT;

	kernbuf[count] = '\0';
	pbuf = kernbuf;
	if (*pbuf == '-') {
		sign = -1;
		pbuf++;
	}

	whole = simple_strtoull(pbuf, &end, 10);
	if (pbuf == end)
		return -EINVAL;

	if (*end == '.') {
		int i;

		pbuf = end + 1;

		/* need to limit frac_d to a __u32 */
		if (strlen(pbuf) > 10)
			pbuf[10] = '\0';

		frac = simple_strtoull(pbuf, &end, 10);
		/* count decimal places */
		for (i = 0; i < (end - pbuf); i++)
			frac_d *= 10;
	}

	units = 1;
	if (end) {
		switch (tolower(*end)) {
		case 'p':
			units <<= 10;
		case 't':
			units <<= 10;
		case 'g':
			units <<= 10;
		case 'm':
			units <<= 10;
		case 'k':
			units <<= 10;
		}
	}
	/* Specified units override the multiplier */
	if (units > 1)
		mult = units;

	frac *= mult;
	do_div(frac, frac_d);
	*val = sign * (whole * mult + frac);
	return 0;
}
EXPORT_SYMBOL(lprocfs_write_frac_u64_helper);

static char *lprocfs_strnstr(const char *s1, const char *s2, size_t len)
{
	size_t l2;

	l2 = strlen(s2);
	if (!l2)
		return (char *)s1;
	while (len >= l2) {
		len--;
		if (!memcmp(s1, s2, l2))
			return (char *)s1;
		s1++;
	}
	return NULL;
}

/**
 * Find the string \a name in the input \a buffer, and return a pointer to the
 * value immediately following \a name, reducing \a count appropriately.
 * If \a name is not found the original \a buffer is returned.
 */
char *lprocfs_find_named_value(const char *buffer, const char *name,
			       size_t *count)
{
	char *val;
	size_t buflen = *count;

	/* there is no strnstr() in rhel5 and ubuntu kernels */
	val = lprocfs_strnstr(buffer, name, buflen);
	if (!val)
		return (char *)buffer;

	val += strlen(name);			     /* skip prefix */
	while (val < buffer + buflen && isspace(*val)) /* skip separator */
		val++;

	*count = 0;
	while (val < buffer + buflen && isalnum(*val)) {
		++*count;
		++val;
	}

	return val - *count;
}
EXPORT_SYMBOL(lprocfs_find_named_value);

int ldebugfs_seq_create(struct dentry *parent, const char *name,
			umode_t mode, const struct file_operations *seq_fops,
			void *data)
{
	struct dentry *entry;

	/* Disallow secretly (un)writable entries. */
	LASSERT((seq_fops->write == NULL) == ((mode & 0222) == 0));

	entry = debugfs_create_file(name, mode, parent, data, seq_fops);
	if (IS_ERR_OR_NULL(entry))
		return entry ? PTR_ERR(entry) : -ENOMEM;

	return 0;
}
EXPORT_SYMBOL_GPL(ldebugfs_seq_create);

int ldebugfs_obd_seq_create(struct obd_device *dev,
			    const char *name,
			    umode_t mode,
			    const struct file_operations *seq_fops,
			    void *data)
{
	return ldebugfs_seq_create(dev->obd_debugfs_entry, name,
				   mode, seq_fops, data);
}
EXPORT_SYMBOL_GPL(ldebugfs_obd_seq_create);

void lprocfs_oh_tally(struct obd_histogram *oh, unsigned int value)
{
	if (value >= OBD_HIST_MAX)
		value = OBD_HIST_MAX - 1;

	spin_lock(&oh->oh_lock);
	oh->oh_buckets[value]++;
	spin_unlock(&oh->oh_lock);
}
EXPORT_SYMBOL(lprocfs_oh_tally);

void lprocfs_oh_tally_log2(struct obd_histogram *oh, unsigned int value)
{
	unsigned int val = 0;

	if (likely(value != 0))
		val = min(fls(value - 1), OBD_HIST_MAX);

	lprocfs_oh_tally(oh, val);
}
EXPORT_SYMBOL(lprocfs_oh_tally_log2);

unsigned long lprocfs_oh_sum(struct obd_histogram *oh)
{
	unsigned long ret = 0;
	int i;

	for (i = 0; i < OBD_HIST_MAX; i++)
		ret +=  oh->oh_buckets[i];
	return ret;
}
EXPORT_SYMBOL(lprocfs_oh_sum);

void lprocfs_oh_clear(struct obd_histogram *oh)
{
	spin_lock(&oh->oh_lock);
	memset(oh->oh_buckets, 0, sizeof(oh->oh_buckets));
	spin_unlock(&oh->oh_lock);
}
EXPORT_SYMBOL(lprocfs_oh_clear);

int lprocfs_wr_root_squash(const char __user *buffer, unsigned long count,
			   struct root_squash_info *squash, char *name)
{
	char kernbuf[64], *tmp, *errmsg;
	unsigned long uid, gid;
	int rc;

	if (count >= sizeof(kernbuf)) {
		errmsg = "string too long";
		rc = -EINVAL;
		goto failed_noprint;
	}
	if (copy_from_user(kernbuf, buffer, count)) {
		errmsg = "bad address";
		rc = -EFAULT;
		goto failed_noprint;
	}
	kernbuf[count] = '\0';

	/* look for uid gid separator */
	tmp = strchr(kernbuf, ':');
	if (!tmp) {
		errmsg = "needs uid:gid format";
		rc = -EINVAL;
		goto failed;
	}
	*tmp = '\0';
	tmp++;

	/* parse uid */
	if (kstrtoul(kernbuf, 0, &uid) != 0) {
		errmsg = "bad uid";
		rc = -EINVAL;
		goto failed;
	}
	/* parse gid */
	if (kstrtoul(tmp, 0, &gid) != 0) {
		errmsg = "bad gid";
		rc = -EINVAL;
		goto failed;
	}

	squash->rsi_uid = uid;
	squash->rsi_gid = gid;

	LCONSOLE_INFO("%s: root_squash is set to %u:%u\n",
		      name, squash->rsi_uid, squash->rsi_gid);
	return count;

failed:
	if (tmp) {
		tmp--;
		*tmp = ':';
	}
	CWARN("%s: failed to set root_squash to \"%s\", %s, rc = %d\n",
	      name, kernbuf, errmsg, rc);
	return rc;
failed_noprint:
	CWARN("%s: failed to set root_squash due to %s, rc = %d\n",
	      name, errmsg, rc);
	return rc;
}
EXPORT_SYMBOL(lprocfs_wr_root_squash);

int lprocfs_wr_nosquash_nids(const char __user *buffer, unsigned long count,
			     struct root_squash_info *squash, char *name)
{
	char *kernbuf = NULL, *errmsg;
	struct list_head tmp;
	int len = count;
	int rc;

	if (count > 4096) {
		errmsg = "string too long";
		rc = -EINVAL;
		goto failed;
	}

	kernbuf = kzalloc(count + 1, GFP_NOFS);
	if (!kernbuf) {
		errmsg = "no memory";
		rc = -ENOMEM;
		goto failed;
	}

	if (copy_from_user(kernbuf, buffer, count)) {
		errmsg = "bad address";
		rc = -EFAULT;
		goto failed;
	}
	kernbuf[count] = '\0';

	if (count > 0 && kernbuf[count - 1] == '\n')
		len = count - 1;

	if ((len == 4 && !strncmp(kernbuf, "NONE", len)) ||
	    (len == 5 && !strncmp(kernbuf, "clear", len))) {
		/* empty string is special case */
		down_write(&squash->rsi_sem);
		if (!list_empty(&squash->rsi_nosquash_nids))
			cfs_free_nidlist(&squash->rsi_nosquash_nids);
		up_write(&squash->rsi_sem);
		LCONSOLE_INFO("%s: nosquash_nids is cleared\n", name);
		kfree(kernbuf);
		return count;
	}

	INIT_LIST_HEAD(&tmp);
	if (cfs_parse_nidlist(kernbuf, count, &tmp) <= 0) {
		errmsg = "can't parse";
		rc = -EINVAL;
		goto failed;
	}
	LCONSOLE_INFO("%s: nosquash_nids set to %s\n",
		      name, kernbuf);
	kfree(kernbuf);
	kernbuf = NULL;

	down_write(&squash->rsi_sem);
	if (!list_empty(&squash->rsi_nosquash_nids))
		cfs_free_nidlist(&squash->rsi_nosquash_nids);
	list_splice(&tmp, &squash->rsi_nosquash_nids);
	up_write(&squash->rsi_sem);

	return count;

failed:
	if (kernbuf) {
		CWARN("%s: failed to set nosquash_nids to \"%s\", %s rc = %d\n",
		      name, kernbuf, errmsg, rc);
		kfree(kernbuf);
		kernbuf = NULL;
	} else {
		CWARN("%s: failed to set nosquash_nids due to %s rc = %d\n",
		      name, errmsg, rc);
	}
	return rc;
}
EXPORT_SYMBOL(lprocfs_wr_nosquash_nids);

static ssize_t lustre_attr_show(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);

	return a->show ? a->show(kobj, attr, buf) : 0;
}

static ssize_t lustre_attr_store(struct kobject *kobj, struct attribute *attr,
				 const char *buf, size_t len)
{
	struct lustre_attr *a = container_of(attr, struct lustre_attr, attr);

	return a->store ? a->store(kobj, attr, buf, len) : len;
}

const struct sysfs_ops lustre_sysfs_ops = {
	.show  = lustre_attr_show,
	.store = lustre_attr_store,
};
EXPORT_SYMBOL_GPL(lustre_sysfs_ops);