objio_osd.c 24.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
/*
 *  pNFS Objects layout implementation over open-osd initiator library
 *
 *  Copyright (C) 2009 Panasas Inc. [year of first publication]
 *  All rights reserved.
 *
 *  Benny Halevy <bhalevy@panasas.com>
 *  Boaz Harrosh <bharrosh@panasas.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  See the file COPYING included with this distribution for more details.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the Panasas company nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/module.h>
41 42 43 44 45 46 47 48
#include <scsi/osd_initiator.h>

#include "objlayout.h"

#define NFSDBG_FACILITY         NFSDBG_PNFS_LD

#define _LLU(x) ((unsigned long long)x)

49 50 51 52
enum { BIO_MAX_PAGES_KMALLOC =
		(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
};

53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
struct objio_dev_ent {
	struct nfs4_deviceid_node id_node;
	struct osd_dev *od;
};

static void
objio_free_deviceid_node(struct nfs4_deviceid_node *d)
{
	struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node);

	dprintk("%s: free od=%p\n", __func__, de->od);
	osduld_put_device(de->od);
	kfree(de);
}

static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss,
	const struct nfs4_deviceid *d_id)
{
	struct nfs4_deviceid_node *d;
	struct objio_dev_ent *de;

	d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id);
	if (!d)
		return NULL;

	de = container_of(d, struct objio_dev_ent, id_node);
	return de;
}

static struct objio_dev_ent *
_dev_list_add(const struct nfs_server *nfss,
	const struct nfs4_deviceid *d_id, struct osd_dev *od,
	gfp_t gfp_flags)
{
	struct nfs4_deviceid_node *d;
	struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
	struct objio_dev_ent *n;

	if (!de) {
		dprintk("%s: -ENOMEM od=%p\n", __func__, od);
		return NULL;
	}

	dprintk("%s: Adding od=%p\n", __func__, od);
	nfs4_init_deviceid_node(&de->id_node,
				nfss->pnfs_curr_ld,
				nfss->nfs_client,
				d_id);
	de->od = od;

	d = nfs4_insert_deviceid_node(&de->id_node);
	n = container_of(d, struct objio_dev_ent, id_node);
	if (n != de) {
		dprintk("%s: Race with other n->od=%p\n", __func__, n->od);
		objio_free_deviceid_node(&de->id_node);
		de = n;
	}

	atomic_inc(&de->id_node.ref);
	return de;
}

115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
struct caps_buffers {
	u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
	u8 creds[OSD_CAP_LEN];
};

struct objio_segment {
	struct pnfs_layout_segment lseg;

	struct pnfs_osd_object_cred *comps;

	unsigned mirrors_p1;
	unsigned stripe_unit;
	unsigned group_width;	/* Data stripe_units without integrity comps */
	u64 group_depth;
	unsigned group_count;

	unsigned comps_index;
	unsigned num_comps;
	/* variable length */
	struct objio_dev_ent *ods[];
};

static inline struct objio_segment *
OBJIO_LSEG(struct pnfs_layout_segment *lseg)
{
	return container_of(lseg, struct objio_segment, lseg);
}

143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
struct objio_state;
typedef ssize_t (*objio_done_fn)(struct objio_state *ios);

struct objio_state {
	/* Generic layer */
	struct objlayout_io_state ol_state;

	struct objio_segment *layout;

	struct kref kref;
	objio_done_fn done;
	void *private;

	unsigned long length;
	unsigned numdevs; /* Actually used devs in this IO */
	/* A per-device variable array of size numdevs */
	struct _objio_per_comp {
		struct bio *bio;
		struct osd_request *or;
		unsigned long length;
		u64 offset;
		unsigned dev;
	} per_dev[];
};

168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251
/* Send and wait for a get_device_info of devices in the layout,
   then look them up with the osd_initiator library */
static struct objio_dev_ent *_device_lookup(struct pnfs_layout_hdr *pnfslay,
				struct objio_segment *objio_seg, unsigned comp,
				gfp_t gfp_flags)
{
	struct pnfs_osd_deviceaddr *deviceaddr;
	struct nfs4_deviceid *d_id;
	struct objio_dev_ent *ode;
	struct osd_dev *od;
	struct osd_dev_info odi;
	int err;

	d_id = &objio_seg->comps[comp].oc_object_id.oid_device_id;

	ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id);
	if (ode)
		return ode;

	err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
	if (unlikely(err)) {
		dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
			__func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
		return ERR_PTR(err);
	}

	odi.systemid_len = deviceaddr->oda_systemid.len;
	if (odi.systemid_len > sizeof(odi.systemid)) {
		err = -EINVAL;
		goto out;
	} else if (odi.systemid_len)
		memcpy(odi.systemid, deviceaddr->oda_systemid.data,
		       odi.systemid_len);
	odi.osdname_len	 = deviceaddr->oda_osdname.len;
	odi.osdname	 = (u8 *)deviceaddr->oda_osdname.data;

	if (!odi.osdname_len && !odi.systemid_len) {
		dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
			__func__);
		err = -ENODEV;
		goto out;
	}

	od = osduld_info_lookup(&odi);
	if (unlikely(IS_ERR(od))) {
		err = PTR_ERR(od);
		dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
		goto out;
	}

	ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od,
			    gfp_flags);

out:
	dprintk("%s: return=%d\n", __func__, err);
	objlayout_put_deviceinfo(deviceaddr);
	return err ? ERR_PTR(err) : ode;
}

static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
	struct objio_segment *objio_seg,
	gfp_t gfp_flags)
{
	unsigned i;
	int err;

	/* lookup all devices */
	for (i = 0; i < objio_seg->num_comps; i++) {
		struct objio_dev_ent *ode;

		ode = _device_lookup(pnfslay, objio_seg, i, gfp_flags);
		if (unlikely(IS_ERR(ode))) {
			err = PTR_ERR(ode);
			goto out;
		}
		objio_seg->ods[i] = ode;
	}
	err = 0;

out:
	dprintk("%s: return=%d\n", __func__, err);
	return err;
}

252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
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;
}

static void copy_single_comp(struct pnfs_osd_object_cred *cur_comp,
			     struct pnfs_osd_object_cred *src_comp,
			     struct caps_buffers *caps_p)
{
	WARN_ON(src_comp->oc_cap_key.cred_len > sizeof(caps_p->caps_key));
	WARN_ON(src_comp->oc_cap.cred_len > sizeof(caps_p->creds));

	*cur_comp = *src_comp;

	memcpy(caps_p->caps_key, src_comp->oc_cap_key.cred,
	       sizeof(caps_p->caps_key));
	cur_comp->oc_cap_key.cred = caps_p->caps_key;

	memcpy(caps_p->creds, src_comp->oc_cap.cred,
	       sizeof(caps_p->creds));
	cur_comp->oc_cap.cred = caps_p->creds;
}

int objio_alloc_lseg(struct pnfs_layout_segment **outp,
	struct pnfs_layout_hdr *pnfslay,
	struct pnfs_layout_range *range,
	struct xdr_stream *xdr,
	gfp_t gfp_flags)
{
	struct objio_segment *objio_seg;
	struct pnfs_osd_xdr_decode_layout_iter iter;
	struct pnfs_osd_layout layout;
	struct pnfs_osd_object_cred *cur_comp, src_comp;
	struct caps_buffers *caps_p;
	int err;

	err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
	if (unlikely(err))
		return err;

	err = _verify_data_map(&layout);
	if (unlikely(err))
		return err;

	objio_seg = kzalloc(sizeof(*objio_seg) +
			    sizeof(objio_seg->ods[0]) * layout.olo_num_comps +
			    sizeof(*objio_seg->comps) * layout.olo_num_comps +
			    sizeof(struct caps_buffers) * layout.olo_num_comps,
			    gfp_flags);
	if (!objio_seg)
		return -ENOMEM;

	objio_seg->comps = (void *)(objio_seg->ods + layout.olo_num_comps);
	cur_comp = objio_seg->comps;
	caps_p = (void *)(cur_comp + layout.olo_num_comps);
	while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err))
		copy_single_comp(cur_comp++, &src_comp, caps_p++);
	if (unlikely(err))
		goto err;

	objio_seg->num_comps = layout.olo_num_comps;
	objio_seg->comps_index = layout.olo_comps_index;
349 350 351
	err = objio_devices_lookup(pnfslay, objio_seg, gfp_flags);
	if (err)
		goto err;
352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379

	objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
	objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit;
	if (layout.olo_map.odm_group_width) {
		objio_seg->group_width = layout.olo_map.odm_group_width;
		objio_seg->group_depth = layout.olo_map.odm_group_depth;
		objio_seg->group_count = layout.olo_map.odm_num_comps /
						objio_seg->mirrors_p1 /
						objio_seg->group_width;
	} else {
		objio_seg->group_width = layout.olo_map.odm_num_comps /
						objio_seg->mirrors_p1;
		objio_seg->group_depth = -1;
		objio_seg->group_count = 1;
	}

	*outp = &objio_seg->lseg;
	return 0;

err:
	kfree(objio_seg);
	dprintk("%s: Error: return %d\n", __func__, err);
	*outp = NULL;
	return err;
}

void objio_free_lseg(struct pnfs_layout_segment *lseg)
{
380
	int i;
381 382
	struct objio_segment *objio_seg = OBJIO_LSEG(lseg);

383 384 385 386 387
	for (i = 0; i < objio_seg->num_comps; i++) {
		if (!objio_seg->ods[i])
			break;
		nfs4_put_deviceid_node(&objio_seg->ods[i]->id_node);
	}
388 389 390
	kfree(objio_seg);
}

391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
int objio_alloc_io_state(struct pnfs_layout_segment *lseg,
			 struct objlayout_io_state **outp,
			 gfp_t gfp_flags)
{
	struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
	struct objio_state *ios;
	const unsigned first_size = sizeof(*ios) +
				objio_seg->num_comps * sizeof(ios->per_dev[0]);

	ios = kzalloc(first_size, gfp_flags);
	if (unlikely(!ios))
		return -ENOMEM;

	ios->layout = objio_seg;

	*outp = &ios->ol_state;
	return 0;
}

void objio_free_io_state(struct objlayout_io_state *ol_state)
{
	struct objio_state *ios = container_of(ol_state, struct objio_state,
					       ol_state);

	kfree(ios);
}

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;
		unsigned dev;
		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 */
		}
		dev = ios->per_dev[i].dev;

		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->layout->comps_index;
	unsigned max_dev = min_dev + ios->layout->num_comps;

	BUG_ON(dev < min_dev || max_dev <= dev);
	return ios->layout->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 cur_len,
		gfp_t gfp_flags)
{
	unsigned pg = *cur_pg;
	struct request_queue *q =
			osd_request_queue(_io_od(ios, per_dev->dev));

	per_dev->length += cur_len;

	if (per_dev->bio == NULL) {
		unsigned stripes = ios->layout->num_comps /
						     ios->layout->mirrors_p1;
		unsigned pages_in_stripe = stripes *
				      (ios->layout->stripe_unit / PAGE_SIZE);
		unsigned bio_size = (ios->ol_state.nr_pages + pages_in_stripe) /
				    stripes;

		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->ol_state.nr_pages <= pg);
		cur_len -= pglen;

		added_len = bio_add_pc_page(q, per_dev->bio,
					ios->ol_state.pages[pg], pglen, pgbase);
		if (unlikely(pglen != added_len))
			return -ENOMEM;
		pgbase = 0;
		++pg;
	}
	BUG_ON(cur_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];
		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->ol_state.pgbase));
			} else { /* dev > si->dev */
				per_dev->offset = si->obj_offset - si->unit_off;
				cur_len = stripe_unit;
			}

			if (max_comp < dev)
				max_comp = 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->ol_state.count;
	u64 offset = ios->ol_state.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 ssize_t _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 ssize_t _io_exec(struct objio_state *ios)
{
	DECLARE_COMPLETION_ONSTACK(wait);
	ssize_t status = 0; /* sync status */
	unsigned i;
	objio_done_fn saved_done_fn = ios->done;
	bool sync = ios->ol_state.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);
		status = saved_done_fn(ios);
	}

	return status;
}

/*
 * read
 */
static ssize_t _read_done(struct objio_state *ios)
{
	ssize_t status;
	int ret = _io_check(ios, false);

	_io_free(ios);

	if (likely(!ret))
		status = ios->length;
	else
		status = ret;

	objlayout_read_done(&ios->ol_state, status, ios->ol_state.sync);
	return status;
}

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 pnfs_osd_object_cred *cred =
			&ios->layout->comps[dev];
	struct osd_obj_id obj = {
		.partition = cred->oc_object_id.oid_partition_id,
		.id = cred->oc_object_id.oid_object_id,
	};
	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->oc_cap.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 ssize_t _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); /* In sync mode exec returns the io status */

err:
	_io_free(ios);
	return ret;
}

ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state)
{
	struct objio_state *ios = container_of(ol_state, struct objio_state,
					       ol_state);
	int ret;

	ret = _io_rw_pagelist(ios, GFP_KERNEL);
	if (unlikely(ret))
		return ret;

	return _read_exec(ios);
}

/*
 * write
 */
static ssize_t _write_done(struct objio_state *ios)
{
	ssize_t status;
	int ret = _io_check(ios, true);

	_io_free(ios);

	if (likely(!ret)) {
		/* FIXME: should be based on the OSD's persistence model
		 * See OSD2r05 Section 4.13 Data persistence model */
		ios->ol_state.committed = NFS_FILE_SYNC;
		status = ios->length;
	} else {
		status = ret;
	}

	objlayout_write_done(&ios->ol_state, status, ios->ol_state.sync);
	return status;
}

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 pnfs_osd_object_cred *cred =
					&ios->layout->comps[dev];
		struct osd_obj_id obj = {
			.partition = cred->oc_object_id.oid_partition_id,
			.id = cred->oc_object_id.oid_object_id,
		};
		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->oc_cap.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 ssize_t _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); /* In sync mode exec returns the io->status */

err:
	_io_free(ios);
	return ret;
}

ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable)
{
	struct objio_state *ios = container_of(ol_state, struct objio_state,
					       ol_state);
	int ret;

	/* TODO: ios->stable = stable; */
	ret = _io_rw_pagelist(ios, GFP_NOFS);
	if (unlikely(ret))
		return ret;

	return _write_exec(ios);
}

/*
 * objlayout_pg_test(). Called by nfs_can_coalesce_requests()
 *
 * return 1 :  coalesce page
 * return 0 :  don't coalesce page
 */
int
objlayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
		   struct nfs_page *req)
{
	return 1;
}
963 964 965 966

static struct pnfs_layoutdriver_type objlayout_type = {
	.id = LAYOUT_OSD2_OBJECTS,
	.name = "LAYOUT_OSD2_OBJECTS",
B
Benny Halevy 已提交
967
	.flags                   = PNFS_LAYOUTRET_ON_SETATTR,
968

969 970 971
	.alloc_layout_hdr        = objlayout_alloc_layout_hdr,
	.free_layout_hdr         = objlayout_free_layout_hdr,

972 973
	.alloc_lseg              = objlayout_alloc_lseg,
	.free_lseg               = objlayout_free_lseg,
974

975 976 977 978
	.read_pagelist           = objlayout_read_pagelist,
	.write_pagelist          = objlayout_write_pagelist,
	.pg_test                 = objlayout_pg_test,

979
	.free_deviceid_node	 = objio_free_deviceid_node,
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
};

MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>");
MODULE_LICENSE("GPL");

static int __init
objlayout_init(void)
{
	int ret = pnfs_register_layoutdriver(&objlayout_type);

	if (ret)
		printk(KERN_INFO
			"%s: Registering OSD pNFS Layout Driver failed: error=%d\n",
			__func__, ret);
	else
		printk(KERN_INFO "%s: Registered OSD pNFS Layout Driver\n",
			__func__);
	return ret;
}

static void __exit
objlayout_exit(void)
{
	pnfs_unregister_layoutdriver(&objlayout_type);
	printk(KERN_INFO "%s: Unregistered OSD pNFS Layout Driver\n",
	       __func__);
}

module_init(objlayout_init);
module_exit(objlayout_exit);