[net-next-2.6.git] / fs / exofs / ios.c

/*
 * 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(1), 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 < 1; i++) {
		struct osd_request *or;

		or = osd_start_request(ios->sbi->s_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++;

		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 < 1; i++) {
		struct osd_request *or;

		or = osd_start_request(ios->sbi->s_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++;

		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 < 1; i++) {
		struct osd_request *or;

		or = osd_start_request(ios->sbi->s_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) {
			struct bio *bio;

			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;

		or = osd_start_request(ios->sbi->s_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 < 1; i++) {
		struct osd_request *or;

		or = osd_start_request(sbi->s_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++;

		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;
}
Commit	Line	Data
b14f8ab2 BH	1	/*
b14f8ab2 BH	2	* Copyright (C) 2005, 2006
27d2e149	3	* Avishay Traeger (avishay@gmail.com)
b14f8ab2 BH	4	* Copyright (C) 2008, 2009
	5	* Boaz Harrosh <bharrosh@panasas.com>
	6	*
	7	* This file is part of exofs.
	8	*
	9	* exofs is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation. Since it is based on ext2, and the only
	12	* valid version of GPL for the Linux kernel is version 2, the only valid
	13	* version of GPL for exofs is version 2.
	14	*
	15	* exofs is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with exofs; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	23	*/
	24
	25	#include <scsi/scsi_device.h>
b14f8ab2 BH	26
	27	#include "exofs.h"
	28
06886a5a	29	void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
b14f8ab2	30	{
06886a5a BH	31	osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
	32	}
	33
	34	int exofs_read_kern(struct osd_dev od, u8 cred, struct osd_obj_id *obj,
	35	u64 offset, void *p, unsigned length)
	36	{
	37	struct osd_request *or = osd_start_request(od, GFP_KERNEL);
	38	/* struct osd_sense_info osi = {.key = 0};*/
	39	int ret;
	40
	41	if (unlikely(!or)) {
	42	EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
	43	return -ENOMEM;
	44	}
	45	ret = osd_req_read_kern(or, obj, offset, p, length);
	46	if (unlikely(ret)) {
	47	EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
	48	goto out;
b14f8ab2 BH	49	}
b14f8ab2 BH	50
06886a5a BH	51	ret = osd_finalize_request(or, 0, cred, NULL);
	52	if (unlikely(ret)) {
	53	EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
	54	goto out;
	55	}
b14f8ab2	56
06886a5a BH	57	ret = osd_execute_request(or);
	58	if (unlikely(ret))
	59	EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
	60	/* osd_req_decode_sense(or, ret); */
b14f8ab2	61
06886a5a BH	62	out:
06886a5a BH	63	osd_end_request(or);
b14f8ab2 BH	64	return ret;
	65	}
	66
06886a5a	67	int exofs_get_io_state(struct exofs_sb_info sbi, struct exofs_io_state* pios)
b14f8ab2	68	{
06886a5a BH	69	struct exofs_io_state *ios;
	70
	71	/*TODO: Maybe use kmem_cach per sbi of size
	72	* exofs_io_state_size(sbi->s_numdevs)
	73	*/
	74	ios = kzalloc(exofs_io_state_size(1), GFP_KERNEL);
	75	if (unlikely(!ios)) {
	76	*pios = NULL;
	77	return -ENOMEM;
	78	}
	79
	80	ios->sbi = sbi;
	81	ios->obj.partition = sbi->s_pid;
	82	*pios = ios;
	83	return 0;
b14f8ab2 BH	84	}
b14f8ab2 BH	85
06886a5a	86	void exofs_put_io_state(struct exofs_io_state *ios)
b14f8ab2	87	{
06886a5a BH	88	if (ios) {
06886a5a BH	89	unsigned i;
b14f8ab2	90
06886a5a BH	91	for (i = 0; i < ios->numdevs; i++) {
	92	struct exofs_per_dev_state *per_dev = &ios->per_dev[i];
	93
	94	if (per_dev->or)
	95	osd_end_request(per_dev->or);
	96	if (per_dev->bio)
	97	bio_put(per_dev->bio);
	98	}
	99
	100	kfree(ios);
b14f8ab2	101	}
06886a5a	102	}
b14f8ab2	103
06886a5a BH	104	static void _sync_done(struct exofs_io_state ios, void p)
	105	{
	106	struct completion *waiting = p;
b14f8ab2	107
06886a5a BH	108	complete(waiting);
	109	}
	110
	111	static void _last_io(struct kref *kref)
	112	{
	113	struct exofs_io_state *ios = container_of(
	114	kref, struct exofs_io_state, kref);
	115
	116	ios->done(ios, ios->private);
	117	}
	118
	119	static void _done_io(struct osd_request or, void p)
	120	{
	121	struct exofs_io_state *ios = p;
	122
	123	kref_put(&ios->kref, _last_io);
	124	}
	125
	126	static int exofs_io_execute(struct exofs_io_state *ios)
	127	{
	128	DECLARE_COMPLETION_ONSTACK(wait);
	129	bool sync = (ios->done == NULL);
	130	int i, ret;
	131
	132	if (sync) {
	133	ios->done = _sync_done;
	134	ios->private = &wait;
	135	}
	136
	137	for (i = 0; i < ios->numdevs; i++) {
	138	struct osd_request *or = ios->per_dev[i].or;
	139	if (unlikely(!or))
	140	continue;
	141
	142	ret = osd_finalize_request(or, 0, ios->cred, NULL);
	143	if (unlikely(ret)) {
	144	EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
	145	ret);
	146	return ret;
	147	}
	148	}
	149
	150	kref_init(&ios->kref);
	151
	152	for (i = 0; i < ios->numdevs; i++) {
	153	struct osd_request *or = ios->per_dev[i].or;
	154	if (unlikely(!or))
	155	continue;
	156
	157	kref_get(&ios->kref);
	158	osd_execute_request_async(or, _done_io, ios);
	159	}
	160
	161	kref_put(&ios->kref, _last_io);
	162	ret = 0;
	163
	164	if (sync) {
	165	wait_for_completion(&wait);
	166	ret = exofs_check_io(ios, NULL);
	167	}
b14f8ab2 BH	168	return ret;
	169	}
	170
06886a5a	171	int exofs_check_io(struct exofs_io_state ios, u64 resid)
b14f8ab2	172	{
06886a5a BH	173	enum osd_err_priority acumulated_osd_err = 0;
	174	int acumulated_lin_err = 0;
	175	int i;
b14f8ab2	176
06886a5a BH	177	for (i = 0; i < ios->numdevs; i++) {
	178	struct osd_sense_info osi;
	179	int ret = osd_req_decode_sense(ios->per_dev[i].or, &osi);
	180
	181	if (likely(!ret))
	182	continue;
	183
	184	if (unlikely(ret == -EFAULT)) {
	185	EXOFS_DBGMSG("%s: EFAULT Need page clear\n", __func__);
	186	/*FIXME: All the pages in this device range should:
	187	* clear_highpage(page);
	188	*/
	189	}
	190
	191	if (osi.osd_err_pri >= acumulated_osd_err) {
	192	acumulated_osd_err = osi.osd_err_pri;
	193	acumulated_lin_err = ret;
	194	}
	195	}
	196
	197	/* TODO: raid specific residual calculations */
	198	if (resid) {
	199	if (likely(!acumulated_lin_err))
	200	*resid = 0;
	201	else
	202	*resid = ios->length;
	203	}
	204
	205	return acumulated_lin_err;
	206	}
	207
	208	int exofs_sbi_create(struct exofs_io_state *ios)
	209	{
	210	int i, ret;
	211
	212	for (i = 0; i < 1; i++) {
	213	struct osd_request *or;
	214
	215	or = osd_start_request(ios->sbi->s_dev, GFP_KERNEL);
	216	if (unlikely(!or)) {
	217	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	218	ret = -ENOMEM;
	219	goto out;
	220	}
	221	ios->per_dev[i].or = or;
	222	ios->numdevs++;
	223
	224	osd_req_create_object(or, &ios->obj);
	225	}
	226	ret = exofs_io_execute(ios);
	227
	228	out:
	229	return ret;
	230	}
	231
	232	int exofs_sbi_remove(struct exofs_io_state *ios)
	233	{
	234	int i, ret;
	235
	236	for (i = 0; i < 1; i++) {
	237	struct osd_request *or;
	238
	239	or = osd_start_request(ios->sbi->s_dev, GFP_KERNEL);
	240	if (unlikely(!or)) {
241	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
242	ret = -ENOMEM;
243	goto out;
244	}
245	ios->per_dev[i].or = or;
246	ios->numdevs++;
247
248	osd_req_remove_object(or, &ios->obj);
249	}
250	ret = exofs_io_execute(ios);
251
252	out:
253	return ret;
254	}
255
256	int exofs_sbi_write(struct exofs_io_state *ios)
257	{
258	int i, ret;
259
260	for (i = 0; i < 1; i++) {
261	struct osd_request *or;
262
263	or = osd_start_request(ios->sbi->s_dev, GFP_KERNEL);
264	if (unlikely(!or)) {
265	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
266	ret = -ENOMEM;
267	goto out;
268	}
269	ios->per_dev[i].or = or;
270	ios->numdevs++;
271
272	if (ios->bio) {
273	struct bio *bio;
274
275	bio = ios->bio;
276
277	osd_req_write(or, &ios->obj, ios->offset, bio,
278	ios->length);
279	/* EXOFS_DBGMSG("write sync=%d\n", sync);*/
280	} else if (ios->kern_buff) {
281	osd_req_write_kern(or, &ios->obj, ios->offset,
282	ios->kern_buff, ios->length);
283	/* EXOFS_DBGMSG("write_kern sync=%d\n", sync);*/
284	} else {
285	osd_req_set_attributes(or, &ios->obj);
286	/* EXOFS_DBGMSG("set_attributes sync=%d\n", sync);*/
287	}
288
289	if (ios->out_attr)
290	osd_req_add_set_attr_list(or, ios->out_attr,
291	ios->out_attr_len);
292
293	if (ios->in_attr)
294	osd_req_add_get_attr_list(or, ios->in_attr,
295	ios->in_attr_len);
b14f8ab2	296	}
06886a5a BH	297	ret = exofs_io_execute(ios);
	298
	299	out:
	300	return ret;
	301	}
	302
	303	int exofs_sbi_read(struct exofs_io_state *ios)
	304	{
	305	int i, ret;
	306
	307	for (i = 0; i < 1; i++) {
	308	struct osd_request *or;
	309
	310	or = osd_start_request(ios->sbi->s_dev, GFP_KERNEL);
	311	if (unlikely(!or)) {
	312	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	313	ret = -ENOMEM;
	314	goto out;
	315	}
	316	ios->per_dev[i].or = or;
	317	ios->numdevs++;
	318
	319	if (ios->bio) {
	320	osd_req_read(or, &ios->obj, ios->offset, ios->bio,
	321	ios->length);
	322	/* EXOFS_DBGMSG("read sync=%d\n", sync);*/
	323	} else if (ios->kern_buff) {
	324	osd_req_read_kern(or, &ios->obj, ios->offset,
	325	ios->kern_buff, ios->length);
	326	/* EXOFS_DBGMSG("read_kern sync=%d\n", sync);*/
	327	} else {
	328	osd_req_get_attributes(or, &ios->obj);
	329	/* EXOFS_DBGMSG("get_attributes sync=%d\n", sync);*/
	330	}
	331
	332	if (ios->out_attr)
	333	osd_req_add_set_attr_list(or, ios->out_attr,
	334	ios->out_attr_len);
b14f8ab2	335
06886a5a BH	336	if (ios->in_attr)
	337	osd_req_add_get_attr_list(or, ios->in_attr,
	338	ios->in_attr_len);
	339	}
	340	ret = exofs_io_execute(ios);
b14f8ab2	341
06886a5a	342	out:
b14f8ab2 BH	343	return ret;
	344	}
	345
06886a5a	346	int extract_attr_from_ios(struct exofs_io_state ios, struct osd_attr attr)
b14f8ab2 BH	347	{
	348	struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
	349	void *iter = NULL;
	350	int nelem;
	351
	352	do {
	353	nelem = 1;
06886a5a BH	354	osd_req_decode_get_attr_list(ios->per_dev[0].or,
06886a5a BH	355	&cur_attr, &nelem, &iter);
b14f8ab2 BH	356	if ((cur_attr.attr_page == attr->attr_page) &&
	357	(cur_attr.attr_id == attr->attr_id)) {
	358	attr->len = cur_attr.len;
	359	attr->val_ptr = cur_attr.val_ptr;
	360	return 0;
	361	}
	362	} while (iter);
	363
	364	return -EIO;
	365	}
06886a5a BH	366
	367	int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
	368	{
	369	struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
	370	struct exofs_io_state *ios;
	371	struct osd_attr attr;
	372	__be64 newsize;
	373	int i, ret;
	374
	375	if (exofs_get_io_state(sbi, &ios))
	376	return -ENOMEM;
	377
	378	ios->obj.id = exofs_oi_objno(oi);
	379	ios->cred = oi->i_cred;
	380
	381	newsize = cpu_to_be64(size);
	382	attr = g_attr_logical_length;
	383	attr.val_ptr = &newsize;
	384
	385	for (i = 0; i < 1; i++) {
	386	struct osd_request *or;
	387
	388	or = osd_start_request(sbi->s_dev, GFP_KERNEL);
	389	if (unlikely(!or)) {
	390	EXOFS_ERR("%s: osd_start_request failed\n", __func__);
	391	ret = -ENOMEM;
	392	goto out;
	393	}
	394	ios->per_dev[i].or = or;
	395	ios->numdevs++;
	396
	397	osd_req_set_attributes(or, &ios->obj);
	398	osd_req_add_set_attr_list(or, &attr, 1);
	399	}
	400	ret = exofs_io_execute(ios);
	401
	402	out:
	403	exofs_put_io_state(ios);
	404	return ret;
	405	}