/*
 * 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) 2008, 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/osd/osd_lproc.c
 *
 * Author: Mikhail Pershin <tappro@sun.com>
 */

#define DEBUG_SUBSYSTEM S_OSD

#include <lprocfs_status.h>

#include "osd_internal.h"

void osd_brw_stats_update(struct osd_device *osd, struct osd_iobuf *iobuf)
{
	struct brw_stats *bs = &osd->od_brw_stats;
	int nr_pages = iobuf->dr_npages;
	int rw = iobuf->dr_rw;

	if (unlikely(nr_pages == 0))
		return;

	lprocfs_oh_tally_log2_pcpu(&bs->bs_hist[BRW_R_PAGES + rw], nr_pages);

	lprocfs_oh_tally_pcpu(&bs->bs_hist[BRW_R_DISCONT_PAGES+rw],
			      iobuf->dr_lextents);
	lprocfs_oh_tally_pcpu(&bs->bs_hist[BRW_R_DISCONT_BLOCKS+rw],
			      iobuf->dr_pextents);
}

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 17, 53, 0)
static void osd_symlink_brw_stats(struct osd_device *osd)
{
	size_t len_root;
	size_t len_path;
	char *root;
	char *s;
	char *p;
	char *path;

	OBD_ALLOC(path, PATH_MAX);
	if (path == NULL)
		return;

	p = dentry_path_raw(osd->od_dt_dev.dd_debugfs_entry, path, PATH_MAX);
	if (IS_ERR(p))
		goto out;

	root = osd->od_dt_dev.dd_debugfs_entry->d_sb->s_fs_info;
	len_root = strlen(root);
	len_path = strlen(p);
	if (len_root > (p - path) || len_root + len_path + 16 > PATH_MAX)
		goto out;

	strscpy(path, root, len_root);
	if (p > path + len_root) {
		s = path + len_root;
		while ((*s++ = *p++) != '\0');
	}

	*(path + len_root + len_path) = '\0';
	strcat(path, "/brw_stats");
	lprocfs_add_symlink("brw_stats", osd->od_proc_entry,
			    "/sys/kernel/debug/%s", path);

out:
	OBD_FREE(path, PATH_MAX);
}
#endif

static int osd_stats_init(struct osd_device *osd)
{
	int result = -ENOMEM;

	ENTRY;
	osd->od_stats = lprocfs_stats_alloc(LPROC_OSD_LAST, 0);
	if (osd->od_stats) {
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_GET_PAGE,
				     LPROCFS_TYPE_LATENCY, "get_page");
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_NO_PAGE,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_REQS,
				     "get_page_failures");
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
				     "cache_access");
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_CACHE_HIT,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
				     "cache_hit");
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_CACHE_MISS,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_PAGES,
				     "cache_miss");
#if OSD_THANDLE_STATS
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_THANDLE_STARTING,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_USECS,
				     "thandle starting");
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_THANDLE_OPEN,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_USECS,
				     "thandle open");
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_THANDLE_CLOSING,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_USECS,
				     "thandle closing");
#endif
		lprocfs_counter_init(osd->od_stats, LPROC_OSD_TOO_MANY_CREDITS,
				     LPROCFS_CNTR_AVGMINMAX|LPROCFS_TYPE_REQS,
				     "many_credits");
		result = 0;
	}

	ldebugfs_register_osd_stats(osd->od_dt_dev.dd_debugfs_entry,
				    &osd->od_brw_stats, osd->od_stats);

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 17, 53, 0)
	osd_symlink_brw_stats(osd);
#endif

	RETURN(result);
}

static ssize_t fstype_show(struct kobject *kobj, struct attribute *attr,
			   char *buf)
{
	return sprintf(buf, "ldiskfs\n");
}
LUSTRE_RO_ATTR(fstype);

static ssize_t mntdev_show(struct kobject *kobj, struct attribute *attr,
			   char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%s\n", osd->od_mntdev);
}
LUSTRE_RO_ATTR(mntdev);

static ssize_t read_cache_enable_show(struct kobject *kobj,
				      struct attribute *attr,
				      char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%u\n", osd->od_read_cache);
}

static ssize_t read_cache_enable_store(struct kobject *kobj,
				       struct attribute *attr,
				       const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	bool val;
	int rc;

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	rc = kstrtobool(buffer, &val);
	if (rc)
		return rc;

	osd->od_read_cache = !!val;
	return count;
}
LUSTRE_RW_ATTR(read_cache_enable);

static ssize_t writethrough_cache_enable_show(struct kobject *kobj,
					      struct attribute *attr,
					      char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%u\n", osd->od_writethrough_cache);
}

static ssize_t writethrough_cache_enable_store(struct kobject *kobj,
					       struct attribute *attr,
					       const char *buffer,
					       size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	bool val;
	int rc;

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	rc = kstrtobool(buffer, &val);
	if (rc)
		return rc;

	osd->od_writethrough_cache = !!val;
	return count;
}
LUSTRE_RW_ATTR(writethrough_cache_enable);

static ssize_t enable_projid_xattr_show(struct kobject *kobj,
					struct attribute *attr,
					char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	return snprintf(buf, PAGE_SIZE, "%u\n", osd->od_enable_projid_xattr);
}

static ssize_t enable_projid_xattr_store(struct kobject *kobj,
					struct attribute *attr,
					const char *buffer,
					size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	bool val;
	int rc;

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	rc = kstrtobool(buffer, &val);
	if (rc)
		return rc;

	osd->od_enable_projid_xattr = !!val;
	return count;
}
LUSTRE_RW_ATTR(enable_projid_xattr);

static ssize_t fallocate_zero_blocks_show(struct kobject *kobj,
					  struct attribute *attr,
					  char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	return scnprintf(buf, PAGE_SIZE, "%d\n", osd->od_fallocate_zero_blocks);
}

/*
 * Set how fallocate() interacts with the backing filesystem:
 * -1: fallocate is disabled and returns -EOPNOTSUPP
 *  0: fallocate allocates unwritten extents (like ext4)
 *  1: fallocate zeroes allocated extents on disk
 */
static ssize_t fallocate_zero_blocks_store(struct kobject *kobj,
					   struct attribute *attr,
					   const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	long val;
	int rc;

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	rc = kstrtol(buffer, 0, &val);
	if (rc)
		return rc;

	if (val < -1 || val > 1)
		return -EINVAL;

	osd->od_fallocate_zero_blocks = val;
	return count;
}
LUSTRE_RW_ATTR(fallocate_zero_blocks);

ssize_t force_sync_store(struct kobject *kobj, struct attribute *attr,
			 const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device, dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	int rc;

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	flush_workqueue(LDISKFS_SB(osd_sb(osd_dt_dev(dt)))->s_misc_wq);
	rc = dt_sync(NULL, dt);

	return rc == 0 ? count : rc;
}
LUSTRE_WO_ATTR(force_sync);

static ssize_t nonrotational_show(struct kobject *kobj, struct attribute *attr,
				  char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%u\n", osd->od_nonrotational);
}

static ssize_t nonrotational_store(struct kobject *kobj,
				   struct attribute *attr, const char *buffer,
				   size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	bool val;
	int rc;

	LASSERT(osd);
	if (unlikely(!osd->od_mnt))
		return -EINPROGRESS;

	rc = kstrtobool(buffer, &val);
	if (rc)
		return rc;

	osd->od_nonrotational = val;
	return count;
}
LUSTRE_RW_ATTR(nonrotational);

static ssize_t pdo_show(struct kobject *kobj, struct attribute *attr,
			char *buf)
{
	return sprintf(buf, "%s\n", ldiskfs_pdo ? "ON" : "OFF");
}

static ssize_t pdo_store(struct kobject *kobj, struct attribute *attr,
			 const char *buffer, size_t count)
{
	bool pdo;
	int rc;

	rc = kstrtobool(buffer, &pdo);
	if (rc != 0)
		return rc;

	ldiskfs_pdo = pdo;

	return count;
}
LUSTRE_RW_ATTR(pdo);

static ssize_t auto_scrub_show(struct kobject *kobj, struct attribute *attr,
			       char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	return scnprintf(buf, PAGE_SIZE, "%lld\n",
			 dev->od_scrub.os_scrub.os_auto_scrub_interval);
}

static ssize_t auto_scrub_store(struct kobject *kobj, struct attribute *attr,
				const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);
	s64 val;
	int rc;

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	rc = kstrtoll(buffer, 0, &val);
	if (rc)
		return rc;

	dev->od_scrub.os_scrub.os_auto_scrub_interval = val;
	return count;
}
LUSTRE_RW_ATTR(auto_scrub);

static ssize_t full_scrub_ratio_show(struct kobject *kobj,
				     struct attribute *attr,
				     char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%llu\n", dev->od_full_scrub_ratio);
}

static ssize_t full_scrub_ratio_store(struct kobject *kobj,
				      struct attribute *attr,
				      const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);
	s64 val;
	int rc;

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	rc = kstrtoll(buffer, 0, &val);
	if (rc)
		return rc;

	if (val < 0)
		return -EINVAL;

	dev->od_full_scrub_ratio = val;
	return count;
}
LUSTRE_RW_ATTR(full_scrub_ratio);

static ssize_t full_scrub_threshold_rate_show(struct kobject *kobj,
					      struct attribute *attr,
					      char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%llu (bad OI mappings/minute)\n",
		       dev->od_full_scrub_threshold_rate);
}

static ssize_t full_scrub_threshold_rate_store(struct kobject *kobj,
					       struct attribute *attr,
					       const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);
	u64 val;
	int rc;

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	rc = kstrtoull(buffer, 0, &val);
	if (rc != 0)
		return rc;

	dev->od_full_scrub_threshold_rate = val;
	return count;
}
LUSTRE_RW_ATTR(full_scrub_threshold_rate);

static ssize_t extent_bytes_allocation_show(struct kobject *kobj,
					    struct attribute *attr, char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);
	int i;
	unsigned int min = (unsigned int)(~0), cur;

	for_each_online_cpu(i) {
		cur = *per_cpu_ptr(dev->od_extent_bytes_percpu, i);
		if (cur < min)
			min = cur;
	}
	return snprintf(buf, PAGE_SIZE, "%u\n", min);
}
LUSTRE_RO_ATTR(extent_bytes_allocation);

static int ldiskfs_osd_oi_scrub_seq_show(struct seq_file *m, void *data)
{
	struct osd_device *dev = osd_dt_dev((struct dt_device *)m->private);

	LASSERT(dev != NULL);
	if (unlikely(dev->od_mnt == NULL))
		return -EINPROGRESS;

	osd_scrub_dump(m, dev);
	return 0;
}

LDEBUGFS_SEQ_FOPS_RO(ldiskfs_osd_oi_scrub);

static int ldiskfs_osd_readcache_seq_show(struct seq_file *m, void *data)
{
	struct osd_device *osd = osd_dt_dev((struct dt_device *)m->private);

	LASSERT(osd != NULL);
	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

	seq_printf(m, "%llu\n", osd->od_readcache_max_filesize);
	return 0;
}

static ssize_t
ldiskfs_osd_readcache_seq_write(struct file *file, const char __user *buffer,
				size_t count, loff_t *off)
{
	struct seq_file *m = file->private_data;
	struct dt_device *dt = m->private;
	struct osd_device *osd = osd_dt_dev(dt);
	char kernbuf[22] = "";
	u64 val;
	int rc;

	LASSERT(osd != NULL);
	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

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

	if (copy_from_user(kernbuf, buffer, count))
		return -EFAULT;
	kernbuf[count] = 0;

	rc = sysfs_memparse(kernbuf, count, &val, "B");
	if (rc < 0)
		return rc;

	osd->od_readcache_max_filesize = val > OSD_MAX_CACHE_SIZE ?
					 OSD_MAX_CACHE_SIZE : val;
	return count;
}

LDEBUGFS_SEQ_FOPS(ldiskfs_osd_readcache);

static int ldiskfs_osd_readcache_max_io_seq_show(struct seq_file *m, void *data)
{
	struct osd_device *osd = osd_dt_dev((struct dt_device *)m->private);

	LASSERT(osd != NULL);
	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

	seq_printf(m, "%lu\n", osd->od_readcache_max_iosize >> 20);
	return 0;
}

static ssize_t
ldiskfs_osd_readcache_max_io_seq_write(struct file *file,
				       const char __user *buffer,
				       size_t count, loff_t *off)
{
	struct seq_file *m = file->private_data;
	struct dt_device *dt = m->private;
	struct osd_device *osd = osd_dt_dev(dt);
	char kernbuf[22] = "";
	u64 val;
	int rc;

	LASSERT(osd != NULL);
	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

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

	if (copy_from_user(kernbuf, buffer, count))
		return -EFAULT;
	kernbuf[count] = 0;

	rc = sysfs_memparse(kernbuf, count, &val, "MiB");
	if (rc < 0)
		return rc;

	if (val > PTLRPC_MAX_BRW_SIZE)
		return -ERANGE;
	osd->od_readcache_max_iosize = val;
	return count;
}

LDEBUGFS_SEQ_FOPS(ldiskfs_osd_readcache_max_io);

static int ldiskfs_osd_writethrough_max_io_seq_show(struct seq_file *m,
						    void *data)
{
	struct osd_device *osd = osd_dt_dev((struct dt_device *)m->private);

	LASSERT(osd != NULL);
	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

	seq_printf(m, "%lu\n", osd->od_writethrough_max_iosize >> 20);
	return 0;
}

static ssize_t
ldiskfs_osd_writethrough_max_io_seq_write(struct file *file,
				       const char __user *buffer,
				       size_t count, loff_t *off)
{
	struct seq_file *m = file->private_data;
	struct dt_device *dt = m->private;
	struct osd_device *osd = osd_dt_dev(dt);
	char kernbuf[22] = "";
	u64 val;
	int rc;

	LASSERT(osd != NULL);
	if (unlikely(osd->od_mnt == NULL))
		return -EINPROGRESS;

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

	if (copy_from_user(kernbuf, buffer, count))
		return -EFAULT;
	kernbuf[count] = 0;

	rc = sysfs_memparse(kernbuf, count, &val, "MiB");
	if (rc < 0)
		return rc;

	if (val > PTLRPC_MAX_BRW_SIZE)
		return -ERANGE;
	osd->od_writethrough_max_iosize = val;
	return count;
}

LDEBUGFS_SEQ_FOPS(ldiskfs_osd_writethrough_max_io);

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 52, 0)
static ssize_t index_in_idif_show(struct kobject *kobj, struct attribute *attr,
				  char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%d\n", (int)(dev->od_index_in_idif));
}

static ssize_t index_in_idif_store(struct kobject *kobj,
				   struct attribute *attr,
				   const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);
	struct lu_target *tgt;
	struct lu_env env;
	bool val;
	int rc;

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	rc = kstrtobool(buffer, &val);
	if (rc)
		return rc;

	if (dev->od_index_in_idif) {
		if (val)
			return count;

		LCONSOLE_WARN("%s: OST-index in IDIF has been enabled, "
			      "it cannot be reverted back.\n", osd_name(dev));
		return -EPERM;
	}

	if (!val)
		return count;

	rc = lu_env_init(&env, LCT_DT_THREAD);
	if (rc)
		return rc;

	tgt = dev->od_dt_dev.dd_lu_dev.ld_site->ls_tgt;
	tgt->lut_lsd.lsd_feature_rocompat |= OBD_ROCOMPAT_IDX_IN_IDIF;
	rc = tgt_server_data_update(&env, tgt, 1);
	lu_env_fini(&env);
	if (rc < 0)
		return rc;

	LCONSOLE_INFO("%s: enable OST-index in IDIF successfully, "
		      "it cannot be reverted back.\n", osd_name(dev));

	dev->od_index_in_idif = 1;
	return count;
}
LUSTRE_RW_ATTR(index_in_idif);

int osd_register_proc_index_in_idif(struct osd_device *osd)
{
	struct dt_device *dt = &osd->od_dt_dev;

	return sysfs_create_file(&dt->dd_kobj, &lustre_attr_index_in_idif.attr);
}
#endif

static ssize_t index_backup_show(struct kobject *kobj, struct attribute *attr,
				 char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					    dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	return sprintf(buf, "%d\n", dev->od_index_backup_policy);
}

ssize_t index_backup_store(struct kobject *kobj, struct attribute *attr,
			   const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device,
					   dd_kobj);
	struct osd_device *dev = osd_dt_dev(dt);
	int val;
	int rc;

	LASSERT(dev);
	if (unlikely(!dev->od_mnt))
		return -EINPROGRESS;

	rc = kstrtoint(buffer, 0, &val);
	if (rc)
		return rc;

	dev->od_index_backup_policy = val;
	return count;
}
LUSTRE_RW_ATTR(index_backup);

#ifdef LDISKFS_GET_BLOCKS_VERY_DENSE
static ssize_t extents_dense_show(struct kobject *kobj, struct attribute *attr,
			char *buf)
{
	struct dt_device *dt = container_of(kobj, struct dt_device, dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);

	return snprintf(buf, PAGE_SIZE, "%d\n", osd->od_extents_dense);
}

static ssize_t extents_dense_store(struct kobject *kobj, struct attribute *attr,
			 const char *buffer, size_t count)
{
	struct dt_device *dt = container_of(kobj, struct dt_device, dd_kobj);
	struct osd_device *osd = osd_dt_dev(dt);
	bool extents_dense;
	int rc;

	rc = kstrtobool(buffer, &extents_dense);
	if (rc != 0)
		return rc;

	osd->od_extents_dense = extents_dense;

	return count;
}
LUSTRE_RW_ATTR(extents_dense);
#endif

struct ldebugfs_vars ldebugfs_osd_obd_vars[] = {
	{ .name =	"oi_scrub",
	  .fops =	&ldiskfs_osd_oi_scrub_fops      },
	{ .name =	"readcache_max_filesize",
	  .fops =	&ldiskfs_osd_readcache_fops     },
	{ .name =	"readcache_max_io_mb",
	  .fops =	&ldiskfs_osd_readcache_max_io_fops      },
	{ .name =	"writethrough_max_io_mb",
	  .fops =	&ldiskfs_osd_writethrough_max_io_fops   },
	{ NULL }
};

static struct attribute *ldiskfs_attrs[] = {
	&lustre_attr_read_cache_enable.attr,
	&lustre_attr_writethrough_cache_enable.attr,
	&lustre_attr_enable_projid_xattr.attr,
	&lustre_attr_fstype.attr,
	&lustre_attr_mntdev.attr,
	&lustre_attr_fallocate_zero_blocks.attr,
	&lustre_attr_force_sync.attr,
	&lustre_attr_nonrotational.attr,
	&lustre_attr_index_backup.attr,
	&lustre_attr_auto_scrub.attr,
	&lustre_attr_pdo.attr,
	&lustre_attr_full_scrub_ratio.attr,
	&lustre_attr_full_scrub_threshold_rate.attr,
	&lustre_attr_extent_bytes_allocation.attr,
#ifdef LDISKFS_GET_BLOCKS_VERY_DENSE
	&lustre_attr_extents_dense.attr,
#endif
	NULL,
};

KOBJ_ATTRIBUTE_GROUPS(ldiskfs); /* creates ldiskfs_groups from ldiskfs_attrs */

int osd_procfs_init(struct osd_device *osd, const char *name)
{
	struct obd_type	*type;
	int rc;

	ENTRY;

	/* at the moment there is no linkage between lu_type
	 * and obd_type, so we lookup obd_type this way
	 */
	type = class_search_type(LUSTRE_OSD_LDISKFS_NAME);

	LASSERT(name);
	LASSERT(type);

	CDEBUG(D_CONFIG, "%s: register osd-ldiskfs tunable parameters\n", name);

	/* put reference taken by class_search_type */
	kobject_put(&type->typ_kobj);

	osd->od_dt_dev.dd_ktype.default_groups = KOBJ_ATTR_GROUPS(ldiskfs);
	rc = dt_tunables_init(&osd->od_dt_dev, type, name,
			      ldebugfs_osd_obd_vars);
	if (rc) {
		CERROR("%s: cannot setup sysfs / debugfs entry: %d\n",
		       name, rc);
		GOTO(out, rc);
	}

	if (osd->od_proc_entry)
		RETURN(0);

	/* Find the type procroot and add the proc entry for this device */
	osd->od_proc_entry = lprocfs_register(name, type->typ_procroot,
					      NULL, &osd->od_dt_dev);
	if (IS_ERR(osd->od_proc_entry)) {
		rc = PTR_ERR(osd->od_proc_entry);
		CERROR("Error %d setting up lprocfs for %s\n",
		       rc, name);
		osd->od_proc_entry = NULL;
		GOTO(out, rc);
	}

	rc = osd_stats_init(osd);

	EXIT;
out:
	if (rc)
		osd_procfs_fini(osd);
	return rc;
}

int osd_procfs_fini(struct osd_device *osd)
{
	lprocfs_fini_brw_stats(&osd->od_brw_stats);

	if (osd->od_stats)
		lprocfs_stats_free(&osd->od_stats);

	if (osd->od_proc_entry)
		lprocfs_remove(&osd->od_proc_entry);

	return dt_tunables_fini(&osd->od_dt_dev);
}