Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1126 deletions

diff --git a/ANDROID_3.4.5/fs/exofs/ore.c b/ANDROID_3.4.5/fs/exofs/ore.c
deleted file mode 100644
index 49cf2305..00000000
--- a/ANDROID_3.4.5/fs/exofs/ore.c
+++ /dev/null
@@ -1,1126 +0,0 @@
-/*
- * 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 <linux/slab.h>
-#include <linux/module.h>
-#include <asm/div64.h>
-#include <linux/lcm.h>
-
-#include "ore_raid.h"
-
-MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
-MODULE_DESCRIPTION("Objects Raid Engine ore.ko");
-MODULE_LICENSE("GPL");
-
-/* ore_verify_layout does a couple of things:
- * 1. Given a minimum number of needed parameters fixes up the rest of the
- *    members to be operatonals for the ore. The needed parameters are those
- *    that are defined by the pnfs-objects layout STD.
- * 2. Check to see if the current ore code actually supports these parameters
- *    for example stripe_unit must be a multple of the system PAGE_SIZE,
- *    and etc...
- * 3. Cache some havily used calculations that will be needed by users.
- */
-
-enum { BIO_MAX_PAGES_KMALLOC =
-		(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),};
-
-int ore_verify_layout(unsigned total_comps, struct ore_layout *layout)
-{
-	u64 stripe_length;
-
-	switch (layout->raid_algorithm) {
-	case PNFS_OSD_RAID_0:
-		layout->parity = 0;
-		break;
-	case PNFS_OSD_RAID_5:
-		layout->parity = 1;
-		break;
-	case PNFS_OSD_RAID_PQ:
-	case PNFS_OSD_RAID_4:
-	default:
-		ORE_ERR("Only RAID_0/5 for now\n");
-		return -EINVAL;
-	}
-	if (0 != (layout->stripe_unit & ~PAGE_MASK)) {
-		ORE_ERR("Stripe Unit(0x%llx)"
-			  " must be Multples of PAGE_SIZE(0x%lx)\n",
-			  _LLU(layout->stripe_unit), PAGE_SIZE);
-		return -EINVAL;
-	}
-	if (layout->group_width) {
-		if (!layout->group_depth) {
-			ORE_ERR("group_depth == 0 && group_width != 0\n");
-			return -EINVAL;
-		}
-		if (total_comps < (layout->group_width * layout->mirrors_p1)) {
-			ORE_ERR("Data Map wrong, "
-				"numdevs=%d < group_width=%d * mirrors=%d\n",
-				total_comps, layout->group_width,
-				layout->mirrors_p1);
-			return -EINVAL;
-		}
-		layout->group_count = total_comps / layout->mirrors_p1 /
-						layout->group_width;
-	} else {
-		if (layout->group_depth) {
-			printk(KERN_NOTICE "Warning: group_depth ignored "
-				"group_width == 0 && group_depth == %lld\n",
-				_LLU(layout->group_depth));
-		}
-		layout->group_width = total_comps / layout->mirrors_p1;
-		layout->group_depth = -1;
-		layout->group_count = 1;
-	}
-
-	stripe_length = (u64)layout->group_width * layout->stripe_unit;
-	if (stripe_length >= (1ULL << 32)) {
-		ORE_ERR("Stripe_length(0x%llx) >= 32bit is not supported\n",
-			_LLU(stripe_length));
-		return -EINVAL;
-	}
-
-	layout->max_io_length =
-		(BIO_MAX_PAGES_KMALLOC * PAGE_SIZE - layout->stripe_unit) *
-							layout->group_width;
-	if (layout->parity) {
-		unsigned stripe_length =
-				(layout->group_width - layout->parity) *
-				layout->stripe_unit;
-
-		layout->max_io_length /= stripe_length;
-		layout->max_io_length *= stripe_length;
-	}
-	return 0;
-}
-EXPORT_SYMBOL(ore_verify_layout);
-
-static u8 *_ios_cred(struct ore_io_state *ios, unsigned index)
-{
-	return ios->oc->comps[index & ios->oc->single_comp].cred;
-}
-
-static struct osd_obj_id *_ios_obj(struct ore_io_state *ios, unsigned index)
-{
-	return &ios->oc->comps[index & ios->oc->single_comp].obj;
-}
-
-static struct osd_dev *_ios_od(struct ore_io_state *ios, unsigned index)
-{
-	ORE_DBGMSG2("oc->first_dev=%d oc->numdevs=%d i=%d oc->ods=%p\n",
-		    ios->oc->first_dev, ios->oc->numdevs, index,
-		    ios->oc->ods);
-
-	return ore_comp_dev(ios->oc, index);
-}
-
-int  _ore_get_io_state(struct ore_layout *layout,
-			struct ore_components *oc, unsigned numdevs,
-			unsigned sgs_per_dev, unsigned num_par_pages,
-			struct ore_io_state **pios)
-{
-	struct ore_io_state *ios;
-	struct page **pages;
-	struct osd_sg_entry *sgilist;
-	struct __alloc_all_io_state {
-		struct ore_io_state ios;
-		struct ore_per_dev_state per_dev[numdevs];
-		union {
-			struct osd_sg_entry sglist[sgs_per_dev * numdevs];
-			struct page *pages[num_par_pages];
-		};
-	} *_aios;
-
-	if (likely(sizeof(*_aios) <= PAGE_SIZE)) {
-		_aios = kzalloc(sizeof(*_aios), GFP_KERNEL);
-		if (unlikely(!_aios)) {
-			ORE_DBGMSG("Failed kzalloc bytes=%zd\n",
-				   sizeof(*_aios));
-			*pios = NULL;
-			return -ENOMEM;
-		}
-		pages = num_par_pages ? _aios->pages : NULL;
-		sgilist = sgs_per_dev ? _aios->sglist : NULL;
-		ios = &_aios->ios;
-	} else {
-		struct __alloc_small_io_state {
-			struct ore_io_state ios;
-			struct ore_per_dev_state per_dev[numdevs];
-		} *_aio_small;
-		union __extra_part {
-			struct osd_sg_entry sglist[sgs_per_dev * numdevs];
-			struct page *pages[num_par_pages];
-		} *extra_part;
-
-		_aio_small = kzalloc(sizeof(*_aio_small), GFP_KERNEL);
-		if (unlikely(!_aio_small)) {
-			ORE_DBGMSG("Failed alloc first part bytes=%zd\n",
-				   sizeof(*_aio_small));
-			*pios = NULL;
-			return -ENOMEM;
-		}
-		extra_part = kzalloc(sizeof(*extra_part), GFP_KERNEL);
-		if (unlikely(!extra_part)) {
-			ORE_DBGMSG("Failed alloc second part bytes=%zd\n",
-				   sizeof(*extra_part));
-			kfree(_aio_small);
-			*pios = NULL;
-			return -ENOMEM;
-		}
-
-		pages = num_par_pages ? extra_part->pages : NULL;
-		sgilist = sgs_per_dev ? extra_part->sglist : NULL;
-		/* In this case the per_dev[0].sgilist holds the pointer to
-		 * be freed
-		 */
-		ios = &_aio_small->ios;
-		ios->extra_part_alloc = true;
-	}
-
-	if (pages) {
-		ios->parity_pages = pages;
-		ios->max_par_pages = num_par_pages;
-	}
-	if (sgilist) {
-		unsigned d;
-
-		for (d = 0; d < numdevs; ++d) {
-			ios->per_dev[d].sglist = sgilist;
-			sgilist += sgs_per_dev;
-		}
-		ios->sgs_per_dev = sgs_per_dev;
-	}
-
-	ios->layout = layout;
-	ios->oc = oc;
-	*pios = ios;
-	return 0;
-}
-
-/* Allocate an io_state for only a single group of devices
- *
- * If a user needs to call ore_read/write() this version must be used becase it
- * allocates extra stuff for striping and raid.
- * The ore might decide to only IO less then @length bytes do to alignmets
- * and constrains as follows:
- * - The IO cannot cross group boundary.
- * - In raid5/6 The end of the IO must align at end of a stripe eg.
- *   (@offset + @length) % strip_size == 0. Or the complete range is within a
- *   single stripe.
- * - Memory condition only permitted a shorter IO. (A user can use @length=~0
- *   And check the returned ios->length for max_io_size.)
- *
- * The caller must check returned ios->length (and/or ios->nr_pages) and
- * re-issue these pages that fall outside of ios->length
- */
-int  ore_get_rw_state(struct ore_layout *layout, struct ore_components *oc,
-		      bool is_reading, u64 offset, u64 length,
-		      struct ore_io_state **pios)
-{
-	struct ore_io_state *ios;
-	unsigned numdevs = layout->group_width * layout->mirrors_p1;
-	unsigned sgs_per_dev = 0, max_par_pages = 0;
-	int ret;
-
-	if (layout->parity && length) {
-		unsigned data_devs = layout->group_width - layout->parity;
-		unsigned stripe_size = layout->stripe_unit * data_devs;
-		unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE;
-		u32 remainder;
-		u64 num_stripes;
-		u64 num_raid_units;
-
-		num_stripes = div_u64_rem(length, stripe_size, &remainder);
-		if (remainder)
-			++num_stripes;
-
-		num_raid_units =  num_stripes * layout->parity;
-
-		if (is_reading) {
-			/* For reads add per_dev sglist array */
-			/* TODO: Raid 6 we need twice more. Actually:
-			*         num_stripes / LCMdP(W,P);
-			*         if (W%P != 0) num_stripes *= parity;
-			*/
-
-			/* first/last seg is split */
-			num_raid_units += layout->group_width;
-			sgs_per_dev = div_u64(num_raid_units, data_devs) + 2;
-		} else {
-			/* For Writes add parity pages array. */
-			max_par_pages = num_raid_units * pages_in_unit *
-						sizeof(struct page *);
-		}
-	}
-
-	ret = _ore_get_io_state(layout, oc, numdevs, sgs_per_dev, max_par_pages,
-				pios);
-	if (unlikely(ret))
-		return ret;
-
-	ios = *pios;
-	ios->reading = is_reading;
-	ios->offset = offset;
-
-	if (length) {
-		ore_calc_stripe_info(layout, offset, length, &ios->si);
-		ios->length = ios->si.length;
-		ios->nr_pages = (ios->length + PAGE_SIZE - 1) / PAGE_SIZE;
-		if (layout->parity)
-			_ore_post_alloc_raid_stuff(ios);
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(ore_get_rw_state);
-
-/* Allocate an io_state for all the devices in the comps array
- *
- * This version of io_state allocation is used mostly by create/remove
- * and trunc where we currently need all the devices. The only wastful
- * bit is the read/write_attributes with no IO. Those sites should
- * be converted to use ore_get_rw_state() with length=0
- */
-int  ore_get_io_state(struct ore_layout *layout, struct ore_components *oc,
-		      struct ore_io_state **pios)
-{
-	return _ore_get_io_state(layout, oc, oc->numdevs, 0, 0, pios);
-}
-EXPORT_SYMBOL(ore_get_io_state);
-
-void ore_put_io_state(struct ore_io_state *ios)
-{
-	if (ios) {
-		unsigned i;
-
-		for (i = 0; i < ios->numdevs; i++) {
-			struct ore_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);
-		}
-
-		_ore_free_raid_stuff(ios);
-		kfree(ios);
-	}
-}
-EXPORT_SYMBOL(ore_put_io_state);
-
-static void _sync_done(struct ore_io_state *ios, void *p)
-{
-	struct completion *waiting = p;
-
-	complete(waiting);
-}
-
-static void _last_io(struct kref *kref)
-{
-	struct ore_io_state *ios = container_of(
-					kref, struct ore_io_state, kref);
-
-	ios->done(ios, ios->private);
-}
-
-static void _done_io(struct osd_request *or, void *p)
-{
-	struct ore_io_state *ios = p;
-
-	kref_put(&ios->kref, _last_io);
-}
-
-int ore_io_execute(struct ore_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(ios, i), NULL);
-		if (unlikely(ret)) {
-			ORE_DBGMSG("Failed 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 = ore_check_io(ios, NULL);
-	}
-	return ret;
-}
-
-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);
-	}
-}
-
-int ore_check_io(struct ore_io_state *ios, ore_on_dev_error on_dev_error)
-{
-	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;
-		struct ore_per_dev_state *per_dev = &ios->per_dev[i];
-		struct osd_request *or = per_dev->or;
-		int ret;
-
-		if (unlikely(!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 */
-			_clear_bio(per_dev->bio);
-			ORE_DBGMSG("start read offset passed end of file "
-				"offset=0x%llx, length=0x%llx\n",
-				_LLU(per_dev->offset),
-				_LLU(per_dev->length));
-
-			continue; /* we recovered */
-		}
-
-		if (on_dev_error) {
-			u64 residual = ios->reading ?
-					or->in.residual : or->out.residual;
-			u64 offset = (ios->offset + ios->length) - residual;
-			unsigned dev = per_dev->dev - ios->oc->first_dev;
-			struct ore_dev *od = ios->oc->ods[dev];
-
-			on_dev_error(ios, od, dev, osi.osd_err_pri,
-				     offset, residual);
-		}
-		if (osi.osd_err_pri >= acumulated_osd_err) {
-			acumulated_osd_err = osi.osd_err_pri;
-			acumulated_lin_err = ret;
-		}
-	}
-
-	return acumulated_lin_err;
-}
-EXPORT_SYMBOL(ore_check_io);
-
-/*
- * L - logical offset into the file
- *
- * D - number of Data devices
- *	D = group_width - parity
- *
- * U - The number of bytes in a stripe within a group
- *	U =  stripe_unit * D
- *
- * T - The number of bytes striped within a group of component objects
- *     (before advancing to the next group)
- *	T = U * group_depth
- *
- * S - The number of bytes striped across all component objects
- *     before the pattern repeats
- *	S = T * group_count
- *
- * M - The "major" (i.e., across all components) cycle number
- *	M = L / S
- *
- * G - Counts the groups from the beginning of the major cycle
- *	G = (L - (M * S)) / T	[or (L % S) / T]
- *
- * H - The byte offset within the group
- *	H = (L - (M * S)) % T	[or (L % S) % T]
- *
- * N - The "minor" (i.e., across the group) stripe number
- *	N = H / U
- *
- * C - The component index coresponding to L
- *
- *	C = (H - (N * U)) / stripe_unit + G * D
- *	[or (L % U) / stripe_unit + G * D]
- *
- * O - The component offset coresponding to L
- *	O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit
- *
- * LCMdP – Parity cycle: Lowest Common Multiple of group_width, parity
- *          divide by parity
- *	LCMdP = lcm(group_width, parity) / parity
- *
- * R - The parity Rotation stripe
- *     (Note parity cycle always starts at a group's boundary)
- *	R = N % LCMdP
- *
- * I = the first parity device index
- *	I = (group_width + group_width - R*parity - parity) % group_width
- *
- * Craid - The component index Rotated
- *	Craid = (group_width + C - R*parity) % group_width
- *      (We add the group_width to avoid negative numbers modulo math)
- */
-void ore_calc_stripe_info(struct ore_layout *layout, u64 file_offset,
-			  u64 length, struct ore_striping_info *si)
-{
-	u32	stripe_unit = layout->stripe_unit;
-	u32	group_width = layout->group_width;
-	u64	group_depth = layout->group_depth;
-	u32	parity      = layout->parity;
-
-	u32	D = group_width - parity;
-	u32	U = D * stripe_unit;
-	u64	T = U * group_depth;
-	u64	S = T * layout->group_count;
-	u64	M = div64_u64(file_offset, S);
-
-	/*
-	G = (L - (M * S)) / T
-	H = (L - (M * S)) % T
-	*/
-	u64	LmodS = file_offset - M * S;
-	u32	G = div64_u64(LmodS, T);
-	u64	H = LmodS - G * T;
-
-	u32	N = div_u64(H, U);
-
-	/* "H - (N * U)" is just "H % U" so it's bound to u32 */
-	u32	C = (u32)(H - (N * U)) / stripe_unit + G * group_width;
-
-	div_u64_rem(file_offset, stripe_unit, &si->unit_off);
-
-	si->obj_offset = si->unit_off + (N * stripe_unit) +
-				  (M * group_depth * stripe_unit);
-
-	if (parity) {
-		u32 LCMdP = lcm(group_width, parity) / parity;
-		/* R     = N % LCMdP; */
-		u32 RxP   = (N % LCMdP) * parity;
-		u32 first_dev = C - C % group_width;
-
-		si->par_dev = (group_width + group_width - parity - RxP) %
-			      group_width + first_dev;
-		si->dev = (group_width + C - RxP) % group_width + first_dev;
-		si->bytes_in_stripe = U;
-		si->first_stripe_start = M * S + G * T + N * U;
-	} else {
-		/* Make the math correct see _prepare_one_group */
-		si->par_dev = group_width;
-		si->dev = C;
-	}
-
-	si->dev *= layout->mirrors_p1;
-	si->par_dev *= layout->mirrors_p1;
-	si->offset = file_offset;
-	si->length = T - H;
-	if (si->length > length)
-		si->length = length;
-	si->M = M;
-}
-EXPORT_SYMBOL(ore_calc_stripe_info);
-
-int _ore_add_stripe_unit(struct ore_io_state *ios,  unsigned *cur_pg,
-			 unsigned pgbase, struct page **pages,
-			 struct ore_per_dev_state *per_dev, int cur_len)
-{
-	unsigned pg = *cur_pg;
-	struct request_queue *q =
-			osd_request_queue(_ios_od(ios, per_dev->dev));
-	unsigned len = cur_len;
-	int ret;
-
-	if (per_dev->bio == NULL) {
-		unsigned pages_in_stripe = ios->layout->group_width *
-					(ios->layout->stripe_unit / PAGE_SIZE);
-		unsigned nr_pages = ios->nr_pages * ios->layout->group_width /
-					(ios->layout->group_width -
-					 ios->layout->parity);
-		unsigned bio_size = (nr_pages + pages_in_stripe) /
-					ios->layout->group_width;
-
-		per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
-		if (unlikely(!per_dev->bio)) {
-			ORE_DBGMSG("Failed to allocate BIO size=%u\n",
-				     bio_size);
-			ret = -ENOMEM;
-			goto out;
-		}
-	}
-
-	while (cur_len > 0) {
-		unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
-		unsigned added_len;
-
-		cur_len -= pglen;
-
-		added_len = bio_add_pc_page(q, per_dev->bio, pages[pg],
-					    pglen, pgbase);
-		if (unlikely(pglen != added_len)) {
-			ORE_DBGMSG("Failed bio_add_pc_page bi_vcnt=%u\n",
-				   per_dev->bio->bi_vcnt);
-			ret = -ENOMEM;
-			goto out;
-		}
-		_add_stripe_page(ios->sp2d, &ios->si, pages[pg]);
-
-		pgbase = 0;
-		++pg;
-	}
-	BUG_ON(cur_len);
-
-	per_dev->length += len;
-	*cur_pg = pg;
-	ret = 0;
-out:	/* we fail the complete unit on an error eg don't advance
-	 * per_dev->length and cur_pg. This means that we might have a bigger
-	 * bio than the CDB requested length (per_dev->length). That's fine
-	 * only the oposite is fatal.
-	 */
-	return ret;
-}
-
-static int _prepare_for_striping(struct ore_io_state *ios)
-{
-	struct ore_striping_info *si = &ios->si;
-	unsigned stripe_unit = ios->layout->stripe_unit;
-	unsigned mirrors_p1 = ios->layout->mirrors_p1;
-	unsigned group_width = ios->layout->group_width;
-	unsigned devs_in_group = group_width * mirrors_p1;
-	unsigned dev = si->dev;
-	unsigned first_dev = dev - (dev % devs_in_group);
-	unsigned dev_order;
-	unsigned cur_pg = ios->pages_consumed;
-	u64 length = ios->length;
-	int ret = 0;
-
-	if (!ios->pages) {
-		ios->numdevs = ios->layout->mirrors_p1;
-		return 0;
-	}
-
-	BUG_ON(length > si->length);
-
-	dev_order = _dev_order(devs_in_group, mirrors_p1, si->par_dev, dev);
-	si->cur_comp = dev_order;
-	si->cur_pg = si->unit_off / PAGE_SIZE;
-
-	while (length) {
-		unsigned comp = dev - first_dev;
-		struct ore_per_dev_state *per_dev = &ios->per_dev[comp];
-		unsigned cur_len, page_off = 0;
-
-		if (!per_dev->length) {
-			per_dev->dev = dev;
-			if (dev == si->dev) {
-				WARN_ON(dev == si->par_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 {
-				if (si->cur_comp > dev_order)
-					per_dev->offset =
-						si->obj_offset - si->unit_off;
-				else /* si->cur_comp < dev_order */
-					per_dev->offset =
-						si->obj_offset + stripe_unit -
-								   si->unit_off;
-				cur_len = stripe_unit;
-			}
-		} else {
-			cur_len = stripe_unit;
-		}
-		if (cur_len >= length)
-			cur_len = length;
-
-		ret = _ore_add_stripe_unit(ios, &cur_pg, page_off, ios->pages,
-					   per_dev, cur_len);
-		if (unlikely(ret))
-			goto out;
-
-		dev += mirrors_p1;
-		dev = (dev % devs_in_group) + first_dev;
-
-		length -= cur_len;
-
-		si->cur_comp = (si->cur_comp + 1) % group_width;
-		if (unlikely((dev == si->par_dev) || (!length && ios->sp2d))) {
-			if (!length && ios->sp2d) {
-				/* If we are writing and this is the very last
-				 * stripe. then operate on parity dev.
-				 */
-				dev = si->par_dev;
-			}
-			if (ios->sp2d)
-				/* In writes cur_len just means if it's the
-				 * last one. See _ore_add_parity_unit.
-				 */
-				cur_len = length;
-			per_dev = &ios->per_dev[dev - first_dev];
-			if (!per_dev->length) {
-				/* Only/always the parity unit of the first
-				 * stripe will be empty. So this is a chance to
-				 * initialize the per_dev info.
-				 */
-				per_dev->dev = dev;
-				per_dev->offset = si->obj_offset - si->unit_off;
-			}
-
-			ret = _ore_add_parity_unit(ios, si, per_dev, cur_len);
-			if (unlikely(ret))
-					goto out;
-
-			/* Rotate next par_dev backwards with wraping */
-			si->par_dev = (devs_in_group + si->par_dev -
-				       ios->layout->parity * mirrors_p1) %
-				      devs_in_group + first_dev;
-			/* Next stripe, start fresh */
-			si->cur_comp = 0;
-			si->cur_pg = 0;
-		}
-	}
-out:
-	ios->numdevs = devs_in_group;
-	ios->pages_consumed = cur_pg;
-	if (unlikely(ret)) {
-		if (length == ios->length)
-			return ret;
-		else
-			ios->length -= length;
-	}
-	return 0;
-}
-
-int ore_create(struct ore_io_state *ios)
-{
-	int i, ret;
-
-	for (i = 0; i < ios->oc->numdevs; i++) {
-		struct osd_request *or;
-
-		or = osd_start_request(_ios_od(ios, i), GFP_KERNEL);
-		if (unlikely(!or)) {
-			ORE_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(ios, i));
-	}
-	ret = ore_io_execute(ios);
-
-out:
-	return ret;
-}
-EXPORT_SYMBOL(ore_create);
-
-int ore_remove(struct ore_io_state *ios)
-{
-	int i, ret;
-
-	for (i = 0; i < ios->oc->numdevs; i++) {
-		struct osd_request *or;
-
-		or = osd_start_request(_ios_od(ios, i), GFP_KERNEL);
-		if (unlikely(!or)) {
-			ORE_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(ios, i));
-	}
-	ret = ore_io_execute(ios);
-
-out:
-	return ret;
-}
-EXPORT_SYMBOL(ore_remove);
-
-static int _write_mirror(struct ore_io_state *ios, int cur_comp)
-{
-	struct ore_per_dev_state *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 = 0;
-
-	if (ios->pages && !master_dev->length)
-		return 0; /* Just an empty slot */
-
-	for (; cur_comp < last_comp; ++cur_comp, ++dev) {
-		struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
-		struct osd_request *or;
-
-		or = osd_start_request(_ios_od(ios, dev), GFP_KERNEL);
-		if (unlikely(!or)) {
-			ORE_ERR("%s: osd_start_request failed\n", __func__);
-			ret = -ENOMEM;
-			goto out;
-		}
-		per_dev->or = or;
-
-		if (ios->pages) {
-			struct bio *bio;
-
-			if (per_dev != master_dev) {
-				bio = bio_kmalloc(GFP_KERNEL,
-						  master_dev->bio->bi_max_vecs);
-				if (unlikely(!bio)) {
-					ORE_DBGMSG(
-					      "Failed to allocate BIO size=%u\n",
-					      master_dev->bio->bi_max_vecs);
-					ret = -ENOMEM;
-					goto out;
-				}
-
-				__bio_clone(bio, master_dev->bio);
-				bio->bi_bdev = NULL;
-				bio->bi_next = NULL;
-				per_dev->offset = master_dev->offset;
-				per_dev->length = master_dev->length;
-				per_dev->bio =  bio;
-				per_dev->dev = dev;
-			} else {
-				bio = master_dev->bio;
-				/* FIXME: bio_set_dir() */
-				bio->bi_rw |= REQ_WRITE;
-			}
-
-			osd_req_write(or, _ios_obj(ios, dev), per_dev->offset,
-				      bio, per_dev->length);
-			ORE_DBGMSG("write(0x%llx) offset=0x%llx "
-				      "length=0x%llx dev=%d\n",
-				     _LLU(_ios_obj(ios, dev)->id),
-				     _LLU(per_dev->offset),
-				     _LLU(per_dev->length), dev);
-		} else if (ios->kern_buff) {
-			per_dev->offset = ios->si.obj_offset;
-			per_dev->dev = ios->si.dev + dev;
-
-			/* no cross device without page array */
-			BUG_ON((ios->layout->group_width > 1) &&
-			       (ios->si.unit_off + ios->length >
-				ios->layout->stripe_unit));
-
-			ret = osd_req_write_kern(or, _ios_obj(ios, per_dev->dev),
-						 per_dev->offset,
-						 ios->kern_buff, ios->length);
-			if (unlikely(ret))
-				goto out;
-			ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
-				      "length=0x%llx dev=%d\n",
-				     _LLU(_ios_obj(ios, dev)->id),
-				     _LLU(per_dev->offset),
-				     _LLU(ios->length), per_dev->dev);
-		} else {
-			osd_req_set_attributes(or, _ios_obj(ios, dev));
-			ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
-				     _LLU(_ios_obj(ios, dev)->id),
-				     ios->out_attr_len, dev);
-		}
-
-		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);
-	}
-
-out:
-	return ret;
-}
-
-int ore_write(struct ore_io_state *ios)
-{
-	int i;
-	int ret;
-
-	if (unlikely(ios->sp2d && !ios->r4w)) {
-		/* A library is attempting a RAID-write without providing
-		 * a pages lock interface.
-		 */
-		WARN_ON_ONCE(1);
-		return -ENOTSUPP;
-	}
-
-	ret = _prepare_for_striping(ios);
-	if (unlikely(ret))
-		return ret;
-
-	for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
-		ret = _write_mirror(ios, i);
-		if (unlikely(ret))
-			return ret;
-	}
-
-	ret = ore_io_execute(ios);
-	return ret;
-}
-EXPORT_SYMBOL(ore_write);
-
-int _ore_read_mirror(struct ore_io_state *ios, unsigned cur_comp)
-{
-	struct osd_request *or;
-	struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
-	struct osd_obj_id *obj = _ios_obj(ios, cur_comp);
-	unsigned first_dev = (unsigned)obj->id;
-
-	if (ios->pages && !per_dev->length)
-		return 0; /* Just an empty slot */
-
-	first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1;
-	or = osd_start_request(_ios_od(ios, first_dev), GFP_KERNEL);
-	if (unlikely(!or)) {
-		ORE_ERR("%s: osd_start_request failed\n", __func__);
-		return -ENOMEM;
-	}
-	per_dev->or = or;
-
-	if (ios->pages) {
-		if (per_dev->cur_sg) {
-			/* finalize the last sg_entry */
-			_ore_add_sg_seg(per_dev, 0, false);
-			if (unlikely(!per_dev->cur_sg))
-				return 0; /* Skip parity only device */
-
-			osd_req_read_sg(or, obj, per_dev->bio,
-					per_dev->sglist, per_dev->cur_sg);
-		} else {
-			/* The no raid case */
-			osd_req_read(or, obj, per_dev->offset,
-				     per_dev->bio, per_dev->length);
-		}
-
-		ORE_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
-			     " dev=%d sg_len=%d\n", _LLU(obj->id),
-			     _LLU(per_dev->offset), _LLU(per_dev->length),
-			     first_dev, per_dev->cur_sg);
-	} else {
-		BUG_ON(ios->kern_buff);
-
-		osd_req_get_attributes(or, obj);
-		ORE_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
-			      _LLU(obj->id),
-			      ios->in_attr_len, first_dev);
-	}
-	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);
-
-	return 0;
-}
-
-int ore_read(struct ore_io_state *ios)
-{
-	int i;
-	int ret;
-
-	ret = _prepare_for_striping(ios);
-	if (unlikely(ret))
-		return ret;
-
-	for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
-		ret = _ore_read_mirror(ios, i);
-		if (unlikely(ret))
-			return ret;
-	}
-
-	ret = ore_io_execute(ios);
-	return ret;
-}
-EXPORT_SYMBOL(ore_read);
-
-int extract_attr_from_ios(struct ore_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;
-}
-EXPORT_SYMBOL(extract_attr_from_ios);
-
-static int _truncate_mirrors(struct ore_io_state *ios, unsigned cur_comp,
-			     struct osd_attr *attr)
-{
-	int last_comp = cur_comp + ios->layout->mirrors_p1;
-
-	for (; cur_comp < last_comp; ++cur_comp) {
-		struct ore_per_dev_state *per_dev = &ios->per_dev[cur_comp];
-		struct osd_request *or;
-
-		or = osd_start_request(_ios_od(ios, cur_comp), GFP_KERNEL);
-		if (unlikely(!or)) {
-			ORE_ERR("%s: osd_start_request failed\n", __func__);
-			return -ENOMEM;
-		}
-		per_dev->or = or;
-
-		osd_req_set_attributes(or, _ios_obj(ios, cur_comp));
-		osd_req_add_set_attr_list(or, attr, 1);
-	}
-
-	return 0;
-}
-
-struct _trunc_info {
-	struct ore_striping_info si;
-	u64 prev_group_obj_off;
-	u64 next_group_obj_off;
-
-	unsigned first_group_dev;
-	unsigned nex_group_dev;
-};
-
-static void _calc_trunk_info(struct ore_layout *layout, u64 file_offset,
-			     struct _trunc_info *ti)
-{
-	unsigned stripe_unit = layout->stripe_unit;
-
-	ore_calc_stripe_info(layout, file_offset, 0, &ti->si);
-
-	ti->prev_group_obj_off = ti->si.M * stripe_unit;
-	ti->next_group_obj_off = ti->si.M ? (ti->si.M - 1) * stripe_unit : 0;
-
-	ti->first_group_dev = ti->si.dev - (ti->si.dev % layout->group_width);
-	ti->nex_group_dev = ti->first_group_dev + layout->group_width;
-}
-
-int ore_truncate(struct ore_layout *layout, struct ore_components *oc,
-		   u64 size)
-{
-	struct ore_io_state *ios;
-	struct exofs_trunc_attr {
-		struct osd_attr attr;
-		__be64 newsize;
-	} *size_attrs;
-	struct _trunc_info ti;
-	int i, ret;
-
-	ret = ore_get_io_state(layout, oc, &ios);
-	if (unlikely(ret))
-		return ret;
-
-	_calc_trunk_info(ios->layout, size, &ti);
-
-	size_attrs = kcalloc(ios->oc->numdevs, sizeof(*size_attrs),
-			     GFP_KERNEL);
-	if (unlikely(!size_attrs)) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	ios->numdevs = ios->oc->numdevs;
-
-	for (i = 0; i < ios->numdevs; ++i) {
-		struct exofs_trunc_attr *size_attr = &size_attrs[i];
-		u64 obj_size;
-
-		if (i < ti.first_group_dev)
-			obj_size = ti.prev_group_obj_off;
-		else if (i >= ti.nex_group_dev)
-			obj_size = ti.next_group_obj_off;
-		else if (i < ti.si.dev) /* dev within this group */
-			obj_size = ti.si.obj_offset +
-				      ios->layout->stripe_unit - ti.si.unit_off;
-		else if (i == ti.si.dev)
-			obj_size = ti.si.obj_offset;
-		else /* i > ti.dev */
-			obj_size = ti.si.obj_offset - ti.si.unit_off;
-
-		size_attr->newsize = cpu_to_be64(obj_size);
-		size_attr->attr = g_attr_logical_length;
-		size_attr->attr.val_ptr = &size_attr->newsize;
-
-		ORE_DBGMSG("trunc(0x%llx) obj_offset=0x%llx dev=%d\n",
-			     _LLU(oc->comps->obj.id), _LLU(obj_size), i);
-		ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
-					&size_attr->attr);
-		if (unlikely(ret))
-			goto out;
-	}
-	ret = ore_io_execute(ios);
-
-out:
-	kfree(size_attrs);
-	ore_put_io_state(ios);
-	return ret;
-}
-EXPORT_SYMBOL(ore_truncate);
-
-const struct osd_attr g_attr_logical_length = ATTR_DEF(
-	OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
-EXPORT_SYMBOL(g_attr_logical_length);