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Commit 04291b62 authored by Boaz Harrosh's avatar Boaz Harrosh Committed by Trond Myklebust
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pnfs-obj: move to ore 03: Remove old raid engine



Finally remove all the old raid engine, which is by now
dead code.

Signed-off-by: default avatarBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent eecfc631
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+0 −504
Original line number Diff line number Diff line
@@ -188,48 +188,6 @@ static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
	return err;
}

#if 0
static int _verify_data_map(struct pnfs_osd_layout *layout)
{
	struct pnfs_osd_data_map *data_map = &layout->olo_map;
	u64 stripe_length;
	u32 group_width;

/* FIXME: Only raid0 for now. if not go through MDS */
	if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) {
		printk(KERN_ERR "Only RAID_0 for now\n");
		return -ENOTSUPP;
	}
	if (0 != (data_map->odm_num_comps % (data_map->odm_mirror_cnt + 1))) {
		printk(KERN_ERR "Data Map wrong, num_comps=%u mirrors=%u\n",
			  data_map->odm_num_comps, data_map->odm_mirror_cnt);
		return -EINVAL;
	}

	if (data_map->odm_group_width)
		group_width = data_map->odm_group_width;
	else
		group_width = data_map->odm_num_comps /
						(data_map->odm_mirror_cnt + 1);

	stripe_length = (u64)data_map->odm_stripe_unit * group_width;
	if (stripe_length >= (1ULL << 32)) {
		printk(KERN_ERR "Total Stripe length(0x%llx)"
			  " >= 32bit is not supported\n", _LLU(stripe_length));
		return -ENOTSUPP;
	}

	if (0 != (data_map->odm_stripe_unit & ~PAGE_MASK)) {
		printk(KERN_ERR "Stripe Unit(0x%llx)"
			  " must be Multples of PAGE_SIZE(0x%lx)\n",
			  _LLU(data_map->odm_stripe_unit), PAGE_SIZE);
		return -ENOTSUPP;
	}

	return 0;
}
#endif

static void copy_single_comp(struct ore_components *oc, unsigned c,
			     struct pnfs_osd_object_cred *src_comp)
{
@@ -441,327 +399,6 @@ static void __on_dev_error(struct ore_io_state *ios,
				dev_offset, dev_len, !ios->reading);
}

#if 0
static void _clear_bio(struct bio *bio)
{
	struct bio_vec *bv;
	unsigned i;

	__bio_for_each_segment(bv, bio, i, 0) {
		unsigned this_count = bv->bv_len;

		if (likely(PAGE_SIZE == this_count))
			clear_highpage(bv->bv_page);
		else
			zero_user(bv->bv_page, bv->bv_offset, this_count);
	}
}

static int _io_check(struct objio_state *ios, bool is_write)
{
	enum osd_err_priority oep = OSD_ERR_PRI_NO_ERROR;
	int lin_ret = 0;
	int i;

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

		if (!or)
			continue;

		ret = osd_req_decode_sense(or, &osi);
		if (likely(!ret))
			continue;

		if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
			/* start read offset passed endof file */
			BUG_ON(is_write);
			_clear_bio(ios->per_dev[i].bio);
			dprintk("%s: start read offset passed end of file "
				"offset=0x%llx, length=0x%lx\n", __func__,
				_LLU(ios->per_dev[i].offset),
				ios->per_dev[i].length);

			continue; /* we recovered */
		}
		__on_dev_error(ios, is_write, ios->oc->ods[i],
				ios->per_dev[i].dev, osi.osd_err_pri,
				ios->per_dev[i].offset, ios->per_dev[i].length);

		if (osi.osd_err_pri >= oep) {
			oep = osi.osd_err_pri;
			lin_ret = ret;
		}
	}

	return lin_ret;
}

/*
 * Common IO state helpers.
 */
static void _io_free(struct objio_state *ios)
{
	unsigned i;

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

		if (per_dev->or) {
			osd_end_request(per_dev->or);
			per_dev->or = NULL;
		}

		if (per_dev->bio) {
			bio_put(per_dev->bio);
			per_dev->bio = NULL;
		}
	}
}

struct osd_dev *_io_od(struct objio_state *ios, unsigned dev)
{
	unsigned min_dev = ios->oc->first_dev;
	unsigned max_dev = min_dev + ios->oc->numdevs;

	BUG_ON(dev < min_dev || max_dev <= dev);
	return ios->oc->ods[dev - min_dev]->od;
}

struct _striping_info {
	u64 obj_offset;
	u64 group_length;
	unsigned dev;
	unsigned unit_off;
};

static void _calc_stripe_info(struct objio_state *ios, u64 file_offset,
			      struct _striping_info *si)
{
	u32	stripe_unit = ios->layout->stripe_unit;
	u32	group_width = ios->layout->group_width;
	u64	group_depth = ios->layout->group_depth;
	u32	U = stripe_unit * group_width;

	u64	T = U * group_depth;
	u64	S = T * ios->layout->group_count;
	u64	M = div64_u64(file_offset, S);

	/*
	G = (L - (M * S)) / T
	H = (L - (M * S)) % T
	*/
	u64	LmodU = file_offset - M * S;
	u32	G = div64_u64(LmodU, T);
	u64	H = LmodU - G * T;

	u32	N = div_u64(H, U);

	div_u64_rem(file_offset, stripe_unit, &si->unit_off);
	si->obj_offset = si->unit_off + (N * stripe_unit) +
				  (M * group_depth * stripe_unit);

	/* "H - (N * U)" is just "H % U" so it's bound to u32 */
	si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
	si->dev *= ios->layout->mirrors_p1;

	si->group_length = T - H;
}

static int _add_stripe_unit(struct objio_state *ios,  unsigned *cur_pg,
		unsigned pgbase, struct _objio_per_comp *per_dev, int len,
		gfp_t gfp_flags)
{
	unsigned pg = *cur_pg;
	int cur_len = len;
	struct request_queue *q =
			osd_request_queue(_io_od(ios, per_dev->dev));

	if (per_dev->bio == NULL) {
		unsigned pages_in_stripe = ios->layout->group_width *
				      (ios->layout->stripe_unit / PAGE_SIZE);
		unsigned bio_size = (ios->nr_pages + pages_in_stripe) /
				    ios->layout->group_width;

		if (BIO_MAX_PAGES_KMALLOC < bio_size)
			bio_size = BIO_MAX_PAGES_KMALLOC;

		per_dev->bio = bio_kmalloc(gfp_flags, bio_size);
		if (unlikely(!per_dev->bio)) {
			dprintk("Faild to allocate BIO size=%u\n", bio_size);
			return -ENOMEM;
		}
	}

	while (cur_len > 0) {
		unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
		unsigned added_len;

		BUG_ON(ios->nr_pages <= pg);
		cur_len -= pglen;

		added_len = bio_add_pc_page(q, per_dev->bio,
					ios->pages[pg], pglen, pgbase);
		if (unlikely(pglen != added_len))
			return -ENOMEM;
		pgbase = 0;
		++pg;
	}
	BUG_ON(cur_len);

	per_dev->length += len;
	*cur_pg = pg;
	return 0;
}

static int _prepare_one_group(struct objio_state *ios, u64 length,
			      struct _striping_info *si, unsigned *last_pg,
			      gfp_t gfp_flags)
{
	unsigned stripe_unit = ios->layout->stripe_unit;
	unsigned mirrors_p1 = ios->layout->mirrors_p1;
	unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
	unsigned dev = si->dev;
	unsigned first_dev = dev - (dev % devs_in_group);
	unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
	unsigned cur_pg = *last_pg;
	int ret = 0;

	while (length) {
		struct _objio_per_comp *per_dev = &ios->per_dev[dev - first_dev];
		unsigned cur_len, page_off = 0;

		if (!per_dev->length) {
			per_dev->dev = dev;
			if (dev < si->dev) {
				per_dev->offset = si->obj_offset + stripe_unit -
								   si->unit_off;
				cur_len = stripe_unit;
			} else if (dev == si->dev) {
				per_dev->offset = si->obj_offset;
				cur_len = stripe_unit - si->unit_off;
				page_off = si->unit_off & ~PAGE_MASK;
				BUG_ON(page_off &&
				      (page_off != ios->pgbase));
			} else { /* dev > si->dev */
				per_dev->offset = si->obj_offset - si->unit_off;
				cur_len = stripe_unit;
			}

			if (max_comp < dev - first_dev)
				max_comp = dev - first_dev;
		} else {
			cur_len = stripe_unit;
		}
		if (cur_len >= length)
			cur_len = length;

		ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
				       cur_len, gfp_flags);
		if (unlikely(ret))
			goto out;

		dev += mirrors_p1;
		dev = (dev % devs_in_group) + first_dev;

		length -= cur_len;
		ios->length += cur_len;
	}
out:
	ios->numdevs = max_comp + mirrors_p1;
	*last_pg = cur_pg;
	return ret;
}

static int _io_rw_pagelist(struct objio_state *ios, gfp_t gfp_flags)
{
	u64 length = ios->count;
	u64 offset = ios->offset;
	struct _striping_info si;
	unsigned last_pg = 0;
	int ret = 0;

	while (length) {
		_calc_stripe_info(ios, offset, &si);

		if (length < si.group_length)
			si.group_length = length;

		ret = _prepare_one_group(ios, si.group_length, &si, &last_pg, gfp_flags);
		if (unlikely(ret))
			goto out;

		offset += si.group_length;
		length -= si.group_length;
	}

out:
	if (!ios->length)
		return ret;

	return 0;
}

static int _sync_done(struct objio_state *ios)
{
	struct completion *waiting = ios->private;

	complete(waiting);
	return 0;
}

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

	ios->done(ios);
}

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

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

static int _io_exec(struct objio_state *ios)
{
	DECLARE_COMPLETION_ONSTACK(wait);
	int ret = 0;
	unsigned i;
	objio_done_fn saved_done_fn = ios->done;
	bool sync = ios->sync;

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

	kref_init(&ios->kref);

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

		if (!or)
			continue;

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

	kref_put(&ios->kref, _last_io);

	if (sync) {
		wait_for_completion(&wait);
		ret = saved_done_fn(ios);
	}

	return ret;
}
#endif

/*
 * read
 */
@@ -781,63 +418,6 @@ static void _read_done(struct ore_io_state *ios, void *private)
	objlayout_read_done(&objios->oir, status, objios->sync);
}

#if 0
static int _read_mirrors(struct objio_state *ios, unsigned cur_comp)
{
	struct osd_request *or = NULL;
	struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
	unsigned dev = per_dev->dev;
	struct ore_comp *cred =
			&ios->oc->comps[cur_comp];
	struct osd_obj_id obj = cred->obj;
	int ret;

	or = osd_start_request(_io_od(ios, dev), GFP_KERNEL);
	if (unlikely(!or)) {
		ret = -ENOMEM;
		goto err;
	}
	per_dev->or = or;

	osd_req_read(or, &obj, per_dev->offset, per_dev->bio, per_dev->length);

	ret = osd_finalize_request(or, 0, cred->cred, NULL);
	if (ret) {
		dprintk("%s: Faild to osd_finalize_request() => %d\n",
			__func__, ret);
		goto err;
	}

	dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
		__func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
		per_dev->length);

err:
	return ret;
}

static int _read_exec(struct objio_state *ios)
{
	unsigned i;
	int ret;

	for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
		if (!ios->per_dev[i].length)
			continue;
		ret = _read_mirrors(ios, i);
		if (unlikely(ret))
			goto err;
	}

	ios->done = _read_done;
	return _io_exec(ios);

err:
	_io_free(ios);
	return ret;
}
#endif

int objio_read_pagelist(struct nfs_read_data *rdata)
{
	struct objio_state *objios;
@@ -879,90 +459,6 @@ static void _write_done(struct ore_io_state *ios, void *private)
	objlayout_write_done(&objios->oir, status, objios->sync);
}

#if 0
static int _write_mirrors(struct objio_state *ios, unsigned cur_comp)
{
	struct _objio_per_comp *master_dev = &ios->per_dev[cur_comp];
	unsigned dev = ios->per_dev[cur_comp].dev;
	unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
	int ret;

	for (; cur_comp < last_comp; ++cur_comp, ++dev) {
		struct osd_request *or = NULL;
		struct ore_comp *cred = &ios->oc->comps[cur_comp];
		struct osd_obj_id obj = cred->obj;
		struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
		struct bio *bio;

		or = osd_start_request(_io_od(ios, dev), GFP_NOFS);
		if (unlikely(!or)) {
			ret = -ENOMEM;
			goto err;
		}
		per_dev->or = or;

		if (per_dev != master_dev) {
			bio = bio_kmalloc(GFP_NOFS,
					  master_dev->bio->bi_max_vecs);
			if (unlikely(!bio)) {
				dprintk("Faild to allocate BIO size=%u\n",
					master_dev->bio->bi_max_vecs);
				ret = -ENOMEM;
				goto err;
			}

			__bio_clone(bio, master_dev->bio);
			bio->bi_bdev = NULL;
			bio->bi_next = NULL;
			per_dev->bio = bio;
			per_dev->dev = dev;
			per_dev->length = master_dev->length;
			per_dev->offset =  master_dev->offset;
		} else {
			bio = master_dev->bio;
			bio->bi_rw |= REQ_WRITE;
		}

		osd_req_write(or, &obj, per_dev->offset, bio, per_dev->length);

		ret = osd_finalize_request(or, 0, cred->cred, NULL);
		if (ret) {
			dprintk("%s: Faild to osd_finalize_request() => %d\n",
				__func__, ret);
			goto err;
		}

		dprintk("%s:[%d] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
			__func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
			per_dev->length);
	}

err:
	return ret;
}

static int _write_exec(struct objio_state *ios)
{
	unsigned i;
	int ret;

	for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
		if (!ios->per_dev[i].length)
			continue;
		ret = _write_mirrors(ios, i);
		if (unlikely(ret))
			goto err;
	}

	ios->done = _write_done;
	return _io_exec(ios);

err:
	_io_free(ios);
	return ret;
}
#endif

int objio_write_pagelist(struct nfs_write_data *wdata, int how)
{
	struct objio_state *objios;