fs/exofs/ios.c - maze/linux - Git at Google

 /*
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
  * Boaz Harrosh <bharrosh@panasas.com>
  *
  * This file is part of exofs.
  *
  * exofs 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.  Since it is based on ext2, and the only
  * valid version of GPL for the Linux kernel is version 2, the only valid
  * version of GPL for exofs is version 2.
  *
  * exofs 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 exofs; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <scsi/scsi_device.h>

 #include "exofs.h"

 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
 {
 	osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
 }

 int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
 		    u64 offset, void *p, unsigned length)
 {
 	struct osd_request *or = osd_start_request(od, GFP_KERNEL);
 /*	struct osd_sense_info osi = {.key = 0};*/
 	int ret;

 	if (unlikely(!or)) {
 		EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
 		return -ENOMEM;
 	}
 	ret = osd_req_read_kern(or, obj, offset, p, length);
 	if (unlikely(ret)) {
 		EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
 		goto out;
 	}

 	ret = osd_finalize_request(or, 0, cred, NULL);
 	if (unlikely(ret)) {
 		EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
 		goto out;
 	}

 	ret = osd_execute_request(or);
 	if (unlikely(ret))
 		EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
 	/* osd_req_decode_sense(or, ret); */

 out:
 	osd_end_request(or);
 	return ret;
 }

 int exofs_get_io_state(struct exofs_sb_info *sbi, struct exofs_io_state** pios)
 {
 	struct exofs_io_state *ios;

 	/*TODO: Maybe use kmem_cach per sbi of size
 	 * exofs_io_state_size(sbi->s_numdevs)
 	 */
 	ios = kzalloc(exofs_io_state_size(sbi->s_numdevs), GFP_KERNEL);
 	if (unlikely(!ios)) {
 		*pios = NULL;
 		return -ENOMEM;
 	}

 	ios->sbi = sbi;
 	ios->obj.partition = sbi->s_pid;
 	*pios = ios;
 	return 0;
 }

 void exofs_put_io_state(struct exofs_io_state *ios)
 {
 	if (ios) {
 		unsigned i;

 		for (i = 0; i < ios->numdevs; i++) {
 			struct exofs_per_dev_state *per_dev = &ios->per_dev[i];

 			if (per_dev->or)
 				osd_end_request(per_dev->or);
 			if (per_dev->bio)
 				bio_put(per_dev->bio);
 		}

 		kfree(ios);
 	}
 }

 static void _sync_done(struct exofs_io_state *ios, void *p)
 {
 	struct completion *waiting = p;

 	complete(waiting);
 }

 static void _last_io(struct kref *kref)
 {
 	struct exofs_io_state *ios = container_of(
 					kref, struct exofs_io_state, kref);

 	ios->done(ios, ios->private);
 }

 static void _done_io(struct osd_request *or, void *p)
 {
 	struct exofs_io_state *ios = p;

 	kref_put(&ios->kref, _last_io);
 }

 static int exofs_io_execute(struct exofs_io_state *ios)
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
 	bool sync = (ios->done == NULL);
 	int i, ret;

 	if (sync) {
 		ios->done = _sync_done;
 		ios->private = &wait;
 	}

 	for (i = 0; i < ios->numdevs; i++) {
 		struct osd_request *or = ios->per_dev[i].or;
 		if (unlikely(!or))
 			continue;

 		ret = osd_finalize_request(or, 0, ios->cred, NULL);
 		if (unlikely(ret)) {
 			EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
 				     ret);
 			return ret;
 		}
 	}

 	kref_init(&ios->kref);

 	for (i = 0; i < ios->numdevs; i++) {
 		struct osd_request *or = ios->per_dev[i].or;
 		if (unlikely(!or))
 			continue;

 		kref_get(&ios->kref);
 		osd_execute_request_async(or, _done_io, ios);
 	}

 	kref_put(&ios->kref, _last_io);
 	ret = 0;

 	if (sync) {
 		wait_for_completion(&wait);
 		ret = exofs_check_io(ios, NULL);
 	}
 	return ret;
 }

 int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
 {
 	enum osd_err_priority acumulated_osd_err = 0;
 	int acumulated_lin_err = 0;
 	int i;

 	for (i = 0; i < ios->numdevs; i++) {
 		struct osd_sense_info osi;
 		int ret = osd_req_decode_sense(ios->per_dev[i].or, &osi);

 		if (likely(!ret))
 			continue;

 		if (unlikely(ret == -EFAULT)) {
 			EXOFS_DBGMSG("%s: EFAULT Need page clear\n", __func__);
 			/*FIXME: All the pages in this device range should:
 			 *	clear_highpage(page);
 			 */
 		}

 		if (osi.osd_err_pri >= acumulated_osd_err) {
 			acumulated_osd_err = osi.osd_err_pri;
 			acumulated_lin_err = ret;
 		}
 	}

 	/* TODO: raid specific residual calculations */
 	if (resid) {
 		if (likely(!acumulated_lin_err))
 			*resid = 0;
 		else
 			*resid = ios->length;
 	}

 	return acumulated_lin_err;
 }

 int exofs_sbi_create(struct exofs_io_state *ios)
 {
 	int i, ret;

 	for (i = 0; i < ios->sbi->s_numdevs; i++) {
 		struct osd_request *or;

 		or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
 		if (unlikely(!or)) {
 			EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 			ret = -ENOMEM;
 			goto out;
 		}
 		ios->per_dev[i].or = or;
 		ios->numdevs++;

 		osd_req_create_object(or, &ios->obj);
 	}
 	ret = exofs_io_execute(ios);

 out:
 	return ret;
 }

 int exofs_sbi_remove(struct exofs_io_state *ios)
 {
 	int i, ret;

 	for (i = 0; i < ios->sbi->s_numdevs; i++) {
 		struct osd_request *or;

 		or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
 		if (unlikely(!or)) {
 			EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 			ret = -ENOMEM;
 			goto out;
 		}
 		ios->per_dev[i].or = or;
 		ios->numdevs++;

 		osd_req_remove_object(or, &ios->obj);
 	}
 	ret = exofs_io_execute(ios);

 out:
 	return ret;
 }

 int exofs_sbi_write(struct exofs_io_state *ios)
 {
 	int i, ret;

 	for (i = 0; i < ios->sbi->s_numdevs; i++) {
 		struct osd_request *or;

 		or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
 		if (unlikely(!or)) {
 			EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 			ret = -ENOMEM;
 			goto out;
 		}
 		ios->per_dev[i].or = or;
 		ios->numdevs++;

 		if (ios->bio) {
 			struct bio *bio;

 			if (i != 0) {
 				bio = bio_kmalloc(GFP_KERNEL,
 						  ios->bio->bi_max_vecs);
 				if (unlikely(!bio)) {
 					ret = -ENOMEM;
 					goto out;
 				}

 				__bio_clone(bio, ios->bio);
 				bio->bi_bdev = NULL;
 				bio->bi_next = NULL;
 				ios->per_dev[i].bio =  bio;
 			} else {
 				bio = ios->bio;
 			}

 			osd_req_write(or, &ios->obj, ios->offset, bio,
 				      ios->length);
 /*			EXOFS_DBGMSG("write sync=%d\n", sync);*/
 		} else if (ios->kern_buff) {
 			osd_req_write_kern(or, &ios->obj, ios->offset,
 					   ios->kern_buff, ios->length);
 /*			EXOFS_DBGMSG("write_kern sync=%d\n", sync);*/
 		} else {
 			osd_req_set_attributes(or, &ios->obj);
 /*			EXOFS_DBGMSG("set_attributes sync=%d\n", sync);*/
 		}

 		if (ios->out_attr)
 			osd_req_add_set_attr_list(or, ios->out_attr,
 						  ios->out_attr_len);

 		if (ios->in_attr)
 			osd_req_add_get_attr_list(or, ios->in_attr,
 						  ios->in_attr_len);
 	}
 	ret = exofs_io_execute(ios);

 out:
 	return ret;
 }

 int exofs_sbi_read(struct exofs_io_state *ios)
 {
 	int i, ret;

 	for (i = 0; i < 1; i++) {
 		struct osd_request *or;
 		unsigned first_dev = (unsigned)ios->obj.id;

 		first_dev %= ios->sbi->s_numdevs;
 		or = osd_start_request(ios->sbi->s_ods[first_dev], GFP_KERNEL);
 		if (unlikely(!or)) {
 			EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 			ret = -ENOMEM;
 			goto out;
 		}
 		ios->per_dev[i].or = or;
 		ios->numdevs++;

 		if (ios->bio) {
 			osd_req_read(or, &ios->obj, ios->offset, ios->bio,
 				     ios->length);
 /*			EXOFS_DBGMSG("read sync=%d\n", sync);*/
 		} else if (ios->kern_buff) {
 			osd_req_read_kern(or, &ios->obj, ios->offset,
 					   ios->kern_buff, ios->length);
 /*			EXOFS_DBGMSG("read_kern sync=%d\n", sync);*/
 		} else {
 			osd_req_get_attributes(or, &ios->obj);
 /*			EXOFS_DBGMSG("get_attributes sync=%d\n", sync);*/
 		}

 		if (ios->out_attr)
 			osd_req_add_set_attr_list(or, ios->out_attr,
 						  ios->out_attr_len);

 		if (ios->in_attr)
 			osd_req_add_get_attr_list(or, ios->in_attr,
 						  ios->in_attr_len);
 	}
 	ret = exofs_io_execute(ios);

 out:
 	return ret;
 }

 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
 {
 	struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
 	void *iter = NULL;
 	int nelem;

 	do {
 		nelem = 1;
 		osd_req_decode_get_attr_list(ios->per_dev[0].or,
 					     &cur_attr, &nelem, &iter);
 		if ((cur_attr.attr_page == attr->attr_page) &&
 		    (cur_attr.attr_id == attr->attr_id)) {
 			attr->len = cur_attr.len;
 			attr->val_ptr = cur_attr.val_ptr;
 			return 0;
 		}
 	} while (iter);

 	return -EIO;
 }

 int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
 {
 	struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
 	struct exofs_io_state *ios;
 	struct osd_attr attr;
 	__be64 newsize;
 	int i, ret;

 	if (exofs_get_io_state(sbi, &ios))
 		return -ENOMEM;

 	ios->obj.id = exofs_oi_objno(oi);
 	ios->cred = oi->i_cred;

 	newsize = cpu_to_be64(size);
 	attr = g_attr_logical_length;
 	attr.val_ptr = &newsize;

 	for (i = 0; i < sbi->s_numdevs; i++) {
 		struct osd_request *or;

 		or = osd_start_request(sbi->s_ods[i], GFP_KERNEL);
 		if (unlikely(!or)) {
 			EXOFS_ERR("%s: osd_start_request failed\n", __func__);
 			ret = -ENOMEM;
 			goto out;
 		}
 		ios->per_dev[i].or = or;
 		ios->numdevs++;

 		osd_req_set_attributes(or, &ios->obj);
 		osd_req_add_set_attr_list(or, &attr, 1);
 	}
 	ret = exofs_io_execute(ios);

 out:
 	exofs_put_io_state(ios);
 	return ret;
 }
	/*
	* Copyright (C) 2005, 2006
	* Avishay Traeger (avishay@gmail.com)
	* Copyright (C) 2008, 2009
	* Boaz Harrosh <bharrosh@panasas.com>
	*
	* This file is part of exofs.
	*
	* exofs 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. Since it is based on ext2, and the only
	* valid version of GPL for the Linux kernel is version 2, the only valid
	* version of GPL for exofs is version 2.
	*
	* exofs 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 exofs; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <scsi/scsi_device.h>

	#include "exofs.h"

	void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
	{
	osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
	}

	int exofs_read_kern(struct osd_dev od, u8 cred, struct osd_obj_id *obj,
	u64 offset, void *p, unsigned length)
	{
	struct osd_request *or = osd_start_request(od, GFP_KERNEL);
	/* struct osd_sense_info osi = {.key = 0};*/
	int ret;

	if (unlikely(!or)) {
	EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
	return -ENOMEM;
	}
	ret = osd_req_read_kern(or, obj, offset, p, length);
	if (unlikely(ret)) {
	EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
	goto out;
	}

	ret = osd_finalize_request(or, 0, cred, NULL);
	if (unlikely(ret)) {
	EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
	goto out;
	}

	ret = osd_execute_request(or);
	if (unlikely(ret))
	EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
	/* osd_req_decode_sense(or, ret); */

	out:
	osd_end_request(or);
	return ret;
	}

	int exofs_get_io_state(struct exofs_sb_info sbi, struct exofs_io_state* pios)
	{
	struct exofs_io_state *ios;

	/*TODO: Maybe use kmem_cach per sbi of size
	* exofs_io_state_size(sbi->s_numdevs)
	*/
	ios = kzalloc(exofs_io_state_size(sbi->s_numdevs), GFP_KERNEL);
	if (unlikely(!ios)) {
	*pios = NULL;
	return -ENOMEM;
	}

	ios->sbi = sbi;
	ios->obj.partition = sbi->s_pid;
	*pios = ios;
	return 0;
	}

	void exofs_put_io_state(struct exofs_io_state *ios)
	{
	if (ios) {
	unsigned i;

	for (i = 0; i < ios->numdevs; i++) {
	struct exofs_per_dev_state *per_dev = &ios->per_dev[i];

	if (per_dev->or)
	osd_end_request(per_dev->or);
	if (per_dev->bio)
	bio_put(per_dev->bio);
	}

	kfree(ios);
	}
	}

	static void _sync_done(struct exofs_io_state ios, void p)
	{
	struct completion *waiting = p;

	complete(waiting);
	}

	static void _last_io(struct kref *kref)
	{
	struct exofs_io_state *ios = container_of(
	kref, struct exofs_io_state, kref);

	ios->done(ios, ios->private);
	}

	static void _done_io(struct osd_request or, void p)
	{
	struct exofs_io_state *ios = p;

	kref_put(&ios->kref, _last_io);
	}

	static int exofs_io_execute(struct exofs_io_state *ios)
	{
	DECLARE_COMPLETION_ONSTACK(wait);
	bool sync = (ios->done == NULL);
	int i, ret;

	if (sync) {
	ios->done = _sync_done;
	ios->private = &wait;
	}

	for (i = 0; i < ios->numdevs; i++) {
	struct osd_request *or = ios->per_dev[i].or;
	if (unlikely(!or))
	continue;

	ret = osd_finalize_request(or, 0, ios->cred, NULL);
	if (unlikely(ret)) {
	EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
	ret);
	return ret;
	}
	}

	kref_init(&ios->kref);

	for (i = 0; i < ios->numdevs; i++) {
	struct osd_request *or = ios->per_dev[i].or;
	if (unlikely(!or))
	continue;

	kref_get(&ios->kref);
	osd_execute_request_async(or, _done_io, ios);
	}

	kref_put(&ios->kref, _last_io);
	ret = 0;

	if (sync) {
	wait_for_completion(&wait);
	ret = exofs_check_io(ios, NULL);
	}
	return ret;
	}

	int exofs_check_io(struct exofs_io_state ios, u64 resid)
	{
	enum osd_err_priority acumulated_osd_err = 0;
	int acumulated_lin_err = 0;
	int i;

	for (i = 0; i < ios->numdevs; i++) {
	struct osd_sense_info osi;
	int ret = osd_req_decode_sense(ios->per_dev[i].or, &osi);

	if (likely(!ret))
	continue;

	if (unlikely(ret == -EFAULT)) {
	EXOFS_DBGMSG("%s: EFAULT Need page clear\n", __func__);
	/*FIXME: All the pages in this device range should:
	* clear_highpage(page);
	*/
	}

	if (osi.osd_err_pri >= acumulated_osd_err) {
	acumulated_osd_err = osi.osd_err_pri;
	acumulated_lin_err = ret;
	}
	}

	/* TODO: raid specific residual calculations */
	if (resid) {
	if (likely(!acumulated_lin_err))
	*resid = 0;
	else
	*resid = ios->length;
	}

	return acumulated_lin_err;
	}

	int exofs_sbi_create(struct exofs_io_state *ios)
	{
	int i, ret;

	for (i = 0; i < ios->sbi->s_numdevs; i++) {
	struct osd_request *or;

	or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
	if (unlikely(!or)) {
	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	ret = -ENOMEM;
	goto out;
	}
	ios->per_dev[i].or = or;
	ios->numdevs++;

	osd_req_create_object(or, &ios->obj);
	}
	ret = exofs_io_execute(ios);

	out:
	return ret;
	}

	int exofs_sbi_remove(struct exofs_io_state *ios)
	{
	int i, ret;

	for (i = 0; i < ios->sbi->s_numdevs; i++) {
	struct osd_request *or;

	or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
	if (unlikely(!or)) {
	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	ret = -ENOMEM;
	goto out;
	}
	ios->per_dev[i].or = or;
	ios->numdevs++;

	osd_req_remove_object(or, &ios->obj);
	}
	ret = exofs_io_execute(ios);

	out:
	return ret;
	}

	int exofs_sbi_write(struct exofs_io_state *ios)
	{
	int i, ret;

	for (i = 0; i < ios->sbi->s_numdevs; i++) {
	struct osd_request *or;

	or = osd_start_request(ios->sbi->s_ods[i], GFP_KERNEL);
	if (unlikely(!or)) {
	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	ret = -ENOMEM;
	goto out;
	}
	ios->per_dev[i].or = or;
	ios->numdevs++;

	if (ios->bio) {
	struct bio *bio;

	if (i != 0) {
	bio = bio_kmalloc(GFP_KERNEL,
	ios->bio->bi_max_vecs);
	if (unlikely(!bio)) {
	ret = -ENOMEM;
	goto out;
	}

	__bio_clone(bio, ios->bio);
	bio->bi_bdev = NULL;
	bio->bi_next = NULL;
	ios->per_dev[i].bio = bio;
	} else {
	bio = ios->bio;
	}

	osd_req_write(or, &ios->obj, ios->offset, bio,
	ios->length);
	/* EXOFS_DBGMSG("write sync=%d\n", sync);*/
	} else if (ios->kern_buff) {
	osd_req_write_kern(or, &ios->obj, ios->offset,
	ios->kern_buff, ios->length);
	/* EXOFS_DBGMSG("write_kern sync=%d\n", sync);*/
	} else {
	osd_req_set_attributes(or, &ios->obj);
	/* EXOFS_DBGMSG("set_attributes sync=%d\n", sync);*/
	}

	if (ios->out_attr)
	osd_req_add_set_attr_list(or, ios->out_attr,
	ios->out_attr_len);

	if (ios->in_attr)
	osd_req_add_get_attr_list(or, ios->in_attr,
	ios->in_attr_len);
	}
	ret = exofs_io_execute(ios);

	out:
	return ret;
	}

	int exofs_sbi_read(struct exofs_io_state *ios)
	{
	int i, ret;

	for (i = 0; i < 1; i++) {
	struct osd_request *or;
	unsigned first_dev = (unsigned)ios->obj.id;

	first_dev %= ios->sbi->s_numdevs;
	or = osd_start_request(ios->sbi->s_ods[first_dev], GFP_KERNEL);
	if (unlikely(!or)) {
	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	ret = -ENOMEM;
	goto out;
	}
	ios->per_dev[i].or = or;
	ios->numdevs++;

	if (ios->bio) {
	osd_req_read(or, &ios->obj, ios->offset, ios->bio,
	ios->length);
	/* EXOFS_DBGMSG("read sync=%d\n", sync);*/
	} else if (ios->kern_buff) {
	osd_req_read_kern(or, &ios->obj, ios->offset,
	ios->kern_buff, ios->length);
	/* EXOFS_DBGMSG("read_kern sync=%d\n", sync);*/
	} else {
	osd_req_get_attributes(or, &ios->obj);
	/* EXOFS_DBGMSG("get_attributes sync=%d\n", sync);*/
	}

	if (ios->out_attr)
	osd_req_add_set_attr_list(or, ios->out_attr,
	ios->out_attr_len);

	if (ios->in_attr)
	osd_req_add_get_attr_list(or, ios->in_attr,
	ios->in_attr_len);
	}
	ret = exofs_io_execute(ios);

	out:
	return ret;
	}

	int extract_attr_from_ios(struct exofs_io_state ios, struct osd_attr attr)
	{
	struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
	void *iter = NULL;
	int nelem;

	do {
	nelem = 1;
	osd_req_decode_get_attr_list(ios->per_dev[0].or,
	&cur_attr, &nelem, &iter);
	if ((cur_attr.attr_page == attr->attr_page) &&
	(cur_attr.attr_id == attr->attr_id)) {
	attr->len = cur_attr.len;
	attr->val_ptr = cur_attr.val_ptr;
	return 0;
	}
	} while (iter);

	return -EIO;
	}

	int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
	{
	struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
	struct exofs_io_state *ios;
	struct osd_attr attr;
	__be64 newsize;
	int i, ret;

	if (exofs_get_io_state(sbi, &ios))
	return -ENOMEM;

	ios->obj.id = exofs_oi_objno(oi);
	ios->cred = oi->i_cred;

	newsize = cpu_to_be64(size);
	attr = g_attr_logical_length;
	attr.val_ptr = &newsize;

	for (i = 0; i < sbi->s_numdevs; i++) {
	struct osd_request *or;

	or = osd_start_request(sbi->s_ods[i], GFP_KERNEL);
	if (unlikely(!or)) {
	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	ret = -ENOMEM;
	goto out;
	}
	ios->per_dev[i].or = or;
	ios->numdevs++;

	osd_req_set_attributes(or, &ios->obj);
	osd_req_add_set_attr_list(or, &attr, 1);
	}
	ret = exofs_io_execute(ios);

	out:
	exofs_put_io_state(ios);
	return ret;
	}