2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com)
4 * Copyright (C) 2008, 2009
5 * Boaz Harrosh <bharrosh@panasas.com>
7 * This file is part of exofs.
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.
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.
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
25 #include <scsi/scsi_device.h>
26 #include <asm/div64.h>
30 #define EXOFS_DBGMSG2(M...) do {} while (0)
31 /* #define EXOFS_DBGMSG2 EXOFS_DBGMSG */
33 void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
35 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
38 int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj,
39 u64 offset, void *p, unsigned length)
41 struct osd_request *or = osd_start_request(od, GFP_KERNEL);
42 /* struct osd_sense_info osi = {.key = 0};*/
46 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__);
49 ret = osd_req_read_kern(or, obj, offset, p, length);
51 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__);
55 ret = osd_finalize_request(or, 0, cred, NULL);
57 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
61 ret = osd_execute_request(or);
63 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
64 /* osd_req_decode_sense(or, ret); */
71 int exofs_get_io_state(struct exofs_layout *layout,
72 struct exofs_io_state **pios)
74 struct exofs_io_state *ios;
76 /*TODO: Maybe use kmem_cach per sbi of size
77 * exofs_io_state_size(layout->s_numdevs)
79 ios = kzalloc(exofs_io_state_size(layout->s_numdevs), GFP_KERNEL);
81 EXOFS_DBGMSG("Faild kzalloc bytes=%d\n",
82 exofs_io_state_size(layout->s_numdevs));
88 ios->obj.partition = layout->s_pid;
93 void exofs_put_io_state(struct exofs_io_state *ios)
98 for (i = 0; i < ios->numdevs; i++) {
99 struct exofs_per_dev_state *per_dev = &ios->per_dev[i];
102 osd_end_request(per_dev->or);
104 bio_put(per_dev->bio);
111 unsigned exofs_layout_od_id(struct exofs_layout *layout,
112 osd_id obj_no, unsigned layout_index)
114 /* switch (layout->lay_func) {
115 case LAYOUT_MOVING_WINDOW:
117 unsigned dev_mod = obj_no;
119 return (layout_index + dev_mod * layout->mirrors_p1) %
122 case LAYOUT_FUNC_IMPLICT:
123 return layout->devs[layout_index];
127 static inline struct osd_dev *exofs_ios_od(struct exofs_io_state *ios,
128 unsigned layout_index)
130 return ios->layout->s_ods[
131 exofs_layout_od_id(ios->layout, ios->obj.id, layout_index)];
134 static void _sync_done(struct exofs_io_state *ios, void *p)
136 struct completion *waiting = p;
141 static void _last_io(struct kref *kref)
143 struct exofs_io_state *ios = container_of(
144 kref, struct exofs_io_state, kref);
146 ios->done(ios, ios->private);
149 static void _done_io(struct osd_request *or, void *p)
151 struct exofs_io_state *ios = p;
153 kref_put(&ios->kref, _last_io);
156 static int exofs_io_execute(struct exofs_io_state *ios)
158 DECLARE_COMPLETION_ONSTACK(wait);
159 bool sync = (ios->done == NULL);
163 ios->done = _sync_done;
164 ios->private = &wait;
167 for (i = 0; i < ios->numdevs; i++) {
168 struct osd_request *or = ios->per_dev[i].or;
172 ret = osd_finalize_request(or, 0, ios->cred, NULL);
174 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n",
180 kref_init(&ios->kref);
182 for (i = 0; i < ios->numdevs; i++) {
183 struct osd_request *or = ios->per_dev[i].or;
187 kref_get(&ios->kref);
188 osd_execute_request_async(or, _done_io, ios);
191 kref_put(&ios->kref, _last_io);
195 wait_for_completion(&wait);
196 ret = exofs_check_io(ios, NULL);
201 static void _clear_bio(struct bio *bio)
206 __bio_for_each_segment(bv, bio, i, 0) {
207 unsigned this_count = bv->bv_len;
209 if (likely(PAGE_SIZE == this_count))
210 clear_highpage(bv->bv_page);
212 zero_user(bv->bv_page, bv->bv_offset, this_count);
216 int exofs_check_io(struct exofs_io_state *ios, u64 *resid)
218 enum osd_err_priority acumulated_osd_err = 0;
219 int acumulated_lin_err = 0;
222 for (i = 0; i < ios->numdevs; i++) {
223 struct osd_sense_info osi;
224 struct osd_request *or = ios->per_dev[i].or;
230 ret = osd_req_decode_sense(or, &osi);
234 if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) {
235 /* start read offset passed endof file */
236 _clear_bio(ios->per_dev[i].bio);
237 EXOFS_DBGMSG("start read offset passed end of file "
238 "offset=0x%llx, length=0x%llx\n",
239 _LLU(ios->per_dev[i].offset),
240 _LLU(ios->per_dev[i].length));
242 continue; /* we recovered */
245 if (osi.osd_err_pri >= acumulated_osd_err) {
246 acumulated_osd_err = osi.osd_err_pri;
247 acumulated_lin_err = ret;
251 /* TODO: raid specific residual calculations */
253 if (likely(!acumulated_lin_err))
256 *resid = ios->length;
259 return acumulated_lin_err;
263 * L - logical offset into the file
265 * U - The number of bytes in a stripe within a group
267 * U = stripe_unit * group_width
269 * T - The number of bytes striped within a group of component objects
270 * (before advancing to the next group)
272 * T = stripe_unit * group_width * group_depth
274 * S - The number of bytes striped across all component objects
275 * before the pattern repeats
277 * S = stripe_unit * group_width * group_depth * group_count
279 * M - The "major" (i.e., across all components) stripe number
283 * G - Counts the groups from the beginning of the major stripe
285 * G = (L - (M * S)) / T [or (L % S) / T]
287 * H - The byte offset within the group
289 * H = (L - (M * S)) % T [or (L % S) % T]
291 * N - The "minor" (i.e., across the group) stripe number
295 * C - The component index coresponding to L
297 * C = (H - (N * U)) / stripe_unit + G * group_width
298 * [or (L % U) / stripe_unit + G * group_width]
300 * O - The component offset coresponding to L
302 * O = L % stripe_unit + N * stripe_unit + M * group_depth * stripe_unit
304 struct _striping_info {
307 u64 total_group_length;
313 static void _calc_stripe_info(struct exofs_io_state *ios, u64 file_offset,
314 struct _striping_info *si)
316 u32 stripe_unit = ios->layout->stripe_unit;
317 u32 group_width = ios->layout->group_width;
318 u64 group_depth = ios->layout->group_depth;
320 u32 U = stripe_unit * group_width;
321 u64 T = U * group_depth;
322 u64 S = T * ios->layout->group_count;
323 u64 M = div64_u64(file_offset, S);
326 G = (L - (M * S)) / T
327 H = (L - (M * S)) % T
329 u64 LmodS = file_offset - M * S;
330 u32 G = div64_u64(LmodS, T);
331 u64 H = LmodS - G * T;
333 u32 N = div_u64(H, U);
335 /* "H - (N * U)" is just "H % U" so it's bound to u32 */
336 si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
337 si->dev *= ios->layout->mirrors_p1;
339 div_u64_rem(file_offset, stripe_unit, &si->unit_off);
341 si->obj_offset = si->unit_off + (N * stripe_unit) +
342 (M * group_depth * stripe_unit);
344 si->group_length = T - H;
345 si->total_group_length = T;
349 static int _add_stripe_unit(struct exofs_io_state *ios, unsigned *cur_pg,
350 unsigned pgbase, struct exofs_per_dev_state *per_dev,
353 unsigned pg = *cur_pg;
354 struct request_queue *q =
355 osd_request_queue(exofs_ios_od(ios, per_dev->dev));
357 per_dev->length += cur_len;
359 if (per_dev->bio == NULL) {
360 unsigned pages_in_stripe = ios->layout->group_width *
361 (ios->layout->stripe_unit / PAGE_SIZE);
362 unsigned bio_size = (ios->nr_pages + pages_in_stripe) /
363 ios->layout->group_width;
365 per_dev->bio = bio_kmalloc(GFP_KERNEL, bio_size);
366 if (unlikely(!per_dev->bio)) {
367 EXOFS_DBGMSG("Faild to allocate BIO size=%u\n",
373 while (cur_len > 0) {
374 unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
377 BUG_ON(ios->nr_pages <= pg);
380 added_len = bio_add_pc_page(q, per_dev->bio, ios->pages[pg],
382 if (unlikely(pglen != added_len))
393 static int _prepare_one_group(struct exofs_io_state *ios, u64 length,
394 struct _striping_info *si, unsigned first_comp)
396 unsigned stripe_unit = ios->layout->stripe_unit;
397 unsigned mirrors_p1 = ios->layout->mirrors_p1;
398 unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
399 unsigned dev = si->dev;
400 unsigned first_dev = dev - (dev % devs_in_group);
401 unsigned comp = first_comp + (dev - first_dev);
402 unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
403 unsigned cur_pg = ios->pages_consumed;
407 struct exofs_per_dev_state *per_dev = &ios->per_dev[comp];
408 unsigned cur_len, page_off = 0;
410 if (!per_dev->length) {
413 per_dev->offset = si->obj_offset + stripe_unit -
415 cur_len = stripe_unit;
416 } else if (dev == si->dev) {
417 per_dev->offset = si->obj_offset;
418 cur_len = stripe_unit - si->unit_off;
419 page_off = si->unit_off & ~PAGE_MASK;
420 BUG_ON(page_off && (page_off != ios->pgbase));
421 } else { /* dev > si->dev */
422 per_dev->offset = si->obj_offset - si->unit_off;
423 cur_len = stripe_unit;
430 dev = (dev % devs_in_group) + first_dev;
432 cur_len = stripe_unit;
434 if (cur_len >= length)
437 ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
443 comp = (comp % devs_in_group) + first_comp;
448 ios->numdevs = max_comp + mirrors_p1;
449 ios->pages_consumed = cur_pg;
453 static int _prepare_for_striping(struct exofs_io_state *ios)
455 u64 length = ios->length;
456 struct _striping_info si;
457 unsigned devs_in_group = ios->layout->group_width *
458 ios->layout->mirrors_p1;
459 unsigned first_comp = 0;
462 _calc_stripe_info(ios, ios->offset, &si);
465 if (ios->kern_buff) {
466 struct exofs_per_dev_state *per_dev = &ios->per_dev[0];
468 per_dev->offset = si.obj_offset;
469 per_dev->dev = si.dev;
471 /* no cross device without page array */
472 BUG_ON((ios->layout->group_width > 1) &&
473 (si.unit_off + ios->length >
474 ios->layout->stripe_unit));
476 ios->numdevs = ios->layout->mirrors_p1;
481 if (length < si.group_length)
482 si.group_length = length;
484 ret = _prepare_one_group(ios, si.group_length, &si, first_comp);
488 length -= si.group_length;
490 si.group_length = si.total_group_length;
493 si.obj_offset = si.Major * ios->layout->stripe_unit *
494 ios->layout->group_depth;
496 si.dev = (si.dev - (si.dev % devs_in_group)) + devs_in_group;
497 si.dev %= ios->layout->s_numdevs;
499 first_comp += devs_in_group;
500 first_comp %= ios->layout->s_numdevs;
507 int exofs_sbi_create(struct exofs_io_state *ios)
511 for (i = 0; i < ios->layout->s_numdevs; i++) {
512 struct osd_request *or;
514 or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL);
516 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
520 ios->per_dev[i].or = or;
523 osd_req_create_object(or, &ios->obj);
525 ret = exofs_io_execute(ios);
531 int exofs_sbi_remove(struct exofs_io_state *ios)
535 for (i = 0; i < ios->layout->s_numdevs; i++) {
536 struct osd_request *or;
538 or = osd_start_request(exofs_ios_od(ios, i), GFP_KERNEL);
540 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
544 ios->per_dev[i].or = or;
547 osd_req_remove_object(or, &ios->obj);
549 ret = exofs_io_execute(ios);
555 static int _sbi_write_mirror(struct exofs_io_state *ios, int cur_comp)
557 struct exofs_per_dev_state *master_dev = &ios->per_dev[cur_comp];
558 unsigned dev = ios->per_dev[cur_comp].dev;
559 unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
562 if (ios->pages && !master_dev->length)
563 return 0; /* Just an empty slot */
565 for (; cur_comp < last_comp; ++cur_comp, ++dev) {
566 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
567 struct osd_request *or;
569 or = osd_start_request(exofs_ios_od(ios, dev), GFP_KERNEL);
571 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
576 per_dev->offset = master_dev->offset;
581 if (per_dev != master_dev) {
582 bio = bio_kmalloc(GFP_KERNEL,
583 master_dev->bio->bi_max_vecs);
584 if (unlikely(!bio)) {
586 "Faild to allocate BIO size=%u\n",
587 master_dev->bio->bi_max_vecs);
592 __bio_clone(bio, master_dev->bio);
595 per_dev->length = master_dev->length;
599 bio = master_dev->bio;
600 /* FIXME: bio_set_dir() */
601 bio->bi_rw |= (1 << BIO_RW);
604 osd_req_write(or, &ios->obj, per_dev->offset, bio,
606 EXOFS_DBGMSG("write(0x%llx) offset=0x%llx "
607 "length=0x%llx dev=%d\n",
608 _LLU(ios->obj.id), _LLU(per_dev->offset),
609 _LLU(per_dev->length), dev);
610 } else if (ios->kern_buff) {
611 ret = osd_req_write_kern(or, &ios->obj, per_dev->offset,
612 ios->kern_buff, ios->length);
615 EXOFS_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
616 "length=0x%llx dev=%d\n",
617 _LLU(ios->obj.id), _LLU(per_dev->offset),
618 _LLU(ios->length), dev);
620 osd_req_set_attributes(or, &ios->obj);
621 EXOFS_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
622 _LLU(ios->obj.id), ios->out_attr_len, dev);
626 osd_req_add_set_attr_list(or, ios->out_attr,
630 osd_req_add_get_attr_list(or, ios->in_attr,
638 int exofs_sbi_write(struct exofs_io_state *ios)
643 ret = _prepare_for_striping(ios);
647 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
648 ret = _sbi_write_mirror(ios, i);
653 ret = exofs_io_execute(ios);
657 static int _sbi_read_mirror(struct exofs_io_state *ios, unsigned cur_comp)
659 struct osd_request *or;
660 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
661 unsigned first_dev = (unsigned)ios->obj.id;
663 if (ios->pages && !per_dev->length)
664 return 0; /* Just an empty slot */
666 first_dev = per_dev->dev + first_dev % ios->layout->mirrors_p1;
667 or = osd_start_request(exofs_ios_od(ios, first_dev), GFP_KERNEL);
669 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
675 osd_req_read(or, &ios->obj, per_dev->offset,
676 per_dev->bio, per_dev->length);
677 EXOFS_DBGMSG("read(0x%llx) offset=0x%llx length=0x%llx"
678 " dev=%d\n", _LLU(ios->obj.id),
679 _LLU(per_dev->offset), _LLU(per_dev->length),
681 } else if (ios->kern_buff) {
682 int ret = osd_req_read_kern(or, &ios->obj, per_dev->offset,
683 ios->kern_buff, ios->length);
684 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx "
685 "length=0x%llx dev=%d ret=>%d\n",
686 _LLU(ios->obj.id), _LLU(per_dev->offset),
687 _LLU(ios->length), first_dev, ret);
691 osd_req_get_attributes(or, &ios->obj);
692 EXOFS_DBGMSG2("obj(0x%llx) get_attributes=%d dev=%d\n",
693 _LLU(ios->obj.id), ios->in_attr_len, first_dev);
696 osd_req_add_set_attr_list(or, ios->out_attr, ios->out_attr_len);
699 osd_req_add_get_attr_list(or, ios->in_attr, ios->in_attr_len);
704 int exofs_sbi_read(struct exofs_io_state *ios)
709 ret = _prepare_for_striping(ios);
713 for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
714 ret = _sbi_read_mirror(ios, i);
719 ret = exofs_io_execute(ios);
723 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr)
725 struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
731 osd_req_decode_get_attr_list(ios->per_dev[0].or,
732 &cur_attr, &nelem, &iter);
733 if ((cur_attr.attr_page == attr->attr_page) &&
734 (cur_attr.attr_id == attr->attr_id)) {
735 attr->len = cur_attr.len;
736 attr->val_ptr = cur_attr.val_ptr;
744 static int _truncate_mirrors(struct exofs_io_state *ios, unsigned cur_comp,
745 struct osd_attr *attr)
747 int last_comp = cur_comp + ios->layout->mirrors_p1;
749 for (; cur_comp < last_comp; ++cur_comp) {
750 struct exofs_per_dev_state *per_dev = &ios->per_dev[cur_comp];
751 struct osd_request *or;
753 or = osd_start_request(exofs_ios_od(ios, cur_comp), GFP_KERNEL);
755 EXOFS_ERR("%s: osd_start_request failed\n", __func__);
760 osd_req_set_attributes(or, &ios->obj);
761 osd_req_add_set_attr_list(or, attr, 1);
767 int exofs_oi_truncate(struct exofs_i_info *oi, u64 size)
769 struct exofs_sb_info *sbi = oi->vfs_inode.i_sb->s_fs_info;
770 struct exofs_io_state *ios;
771 struct exofs_trunc_attr {
772 struct osd_attr attr;
775 struct _striping_info si;
778 ret = exofs_get_io_state(&sbi->layout, &ios);
782 size_attrs = kcalloc(ios->layout->group_width, sizeof(*size_attrs),
784 if (unlikely(!size_attrs)) {
789 ios->obj.id = exofs_oi_objno(oi);
790 ios->cred = oi->i_cred;
792 ios->numdevs = ios->layout->s_numdevs;
793 _calc_stripe_info(ios, size, &si);
795 for (i = 0; i < ios->layout->group_width; ++i) {
796 struct exofs_trunc_attr *size_attr = &size_attrs[i];
800 obj_size = si.obj_offset +
801 ios->layout->stripe_unit - si.unit_off;
802 else if (i == si.dev)
803 obj_size = si.obj_offset;
804 else /* i > si.dev */
805 obj_size = si.obj_offset - si.unit_off;
807 size_attr->newsize = cpu_to_be64(obj_size);
808 size_attr->attr = g_attr_logical_length;
809 size_attr->attr.val_ptr = &size_attr->newsize;
811 ret = _truncate_mirrors(ios, i * ios->layout->mirrors_p1,
816 ret = exofs_io_execute(ios);
820 exofs_put_io_state(ios);