diff options
Diffstat (limited to 'fs/exofs/ore.c')
| -rw-r--r-- | fs/exofs/ore.c | 1178 |
1 files changed, 0 insertions, 1178 deletions
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c deleted file mode 100644 index 5331a15a61f1..000000000000 --- a/fs/exofs/ore.c +++ /dev/null @@ -1,1178 +0,0 @@ -/* - * Copyright (C) 2005, 2006 - * Avishay Traeger (avishay@gmail.com) - * Copyright (C) 2008, 2009 - * Boaz Harrosh <ooo@electrozaur.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 <ooo@electrozaur.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: - layout->parity = 2; - break; - case PNFS_OSD_RAID_4: - default: - ORE_ERR("Only RAID_0/5/6 for now received-enum=%d\n", - layout->raid_algorithm); - 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 - layout->parity); - 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; - } - ORE_DBGMSG("max_io_length=0x%lx\n", layout->max_io_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; - size_t size_ios, size_extra, size_total; - void *ios_extra; - - /* - * The desired layout looks like this, with the extra_allocation - * items pointed at from fields within ios or per_dev: - - 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]; - } extra_allocation; - } whole_allocation; - - */ - - /* This should never happen, so abort early if it ever does. */ - if (sgs_per_dev && num_par_pages) { - ORE_DBGMSG("Tried to use both pages and sglist\n"); - *pios = NULL; - return -EINVAL; - } - - if (numdevs > (INT_MAX - sizeof(*ios)) / - sizeof(struct ore_per_dev_state)) - return -ENOMEM; - size_ios = sizeof(*ios) + sizeof(struct ore_per_dev_state) * numdevs; - - if (sgs_per_dev * numdevs > INT_MAX / sizeof(struct osd_sg_entry)) - return -ENOMEM; - if (num_par_pages > INT_MAX / sizeof(struct page *)) - return -ENOMEM; - size_extra = max(sizeof(struct osd_sg_entry) * (sgs_per_dev * numdevs), - sizeof(struct page *) * num_par_pages); - - size_total = size_ios + size_extra; - - if (likely(size_total <= PAGE_SIZE)) { - ios = kzalloc(size_total, GFP_KERNEL); - if (unlikely(!ios)) { - ORE_DBGMSG("Failed kzalloc bytes=%zd\n", size_total); - *pios = NULL; - return -ENOMEM; - } - ios_extra = (char *)ios + size_ios; - } else { - ios = kzalloc(size_ios, GFP_KERNEL); - if (unlikely(!ios)) { - ORE_DBGMSG("Failed alloc first part bytes=%zd\n", - size_ios); - *pios = NULL; - return -ENOMEM; - } - ios_extra = kzalloc(size_extra, GFP_KERNEL); - if (unlikely(!ios_extra)) { - ORE_DBGMSG("Failed alloc second part bytes=%zd\n", - size_extra); - kfree(ios); - *pios = NULL; - return -ENOMEM; - } - - /* In this case the per_dev[0].sgilist holds the pointer to - * be freed - */ - ios->extra_part_alloc = true; - } - - if (num_par_pages) { - ios->parity_pages = ios_extra; - ios->max_par_pages = num_par_pages; - } - if (sgs_per_dev) { - struct osd_sg_entry *sgilist = ios_extra; - 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->offset & (PAGE_SIZE - 1)) + - 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_all(bv, bio, i) { - 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) && - per_dev->bio) { - /* start read offset passed endof file. - * Note: if we do not have bio it means read-attributes - * In this case we should return error to caller. - */ - _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); - u32 Nlast; - - /* "H - (N * U)" is just "H % U" so it's bound to u32 */ - u32 C = (u32)(H - (N * U)) / stripe_unit + G * group_width; - u32 first_dev = C - C % 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); - si->cur_comp = C - first_dev; - si->cur_pg = si->unit_off / PAGE_SIZE; - - if (parity) { - u32 LCMdP = lcm(group_width, parity) / parity; - /* R = N % LCMdP; */ - u32 RxP = (N % LCMdP) * parity; - - si->par_dev = (group_width + group_width - parity - RxP) % - group_width + first_dev; - si->dev = (group_width + 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; - - Nlast = div_u64(H + si->length + U - 1, U); - si->maxdevUnits = Nlast - N; - - 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 bio_size; - - if (!ios->reading) { - bio_size = ios->si.maxdevUnits; - } else { - bio_size = (ios->si.maxdevUnits + 1) * - (ios->layout->group_width - ios->layout->parity) / - ios->layout->group_width; - } - bio_size *= (ios->layout->stripe_unit / PAGE_SIZE); - - 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)) { - /* If bi_vcnt == bi_max then this is a SW BUG */ - ORE_DBGMSG("Failed bio_add_pc_page bi_vcnt=0x%x " - "bi_max=0x%x BIO_MAX=0x%x cur_len=0x%x\n", - per_dev->bio->bi_vcnt, - per_dev->bio->bi_max_vecs, - BIO_MAX_PAGES_KMALLOC, cur_len); - 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 _add_parity_units(struct ore_io_state *ios, - struct ore_striping_info *si, - unsigned dev, unsigned first_dev, - unsigned mirrors_p1, unsigned devs_in_group, - unsigned cur_len) -{ - unsigned do_parity; - int ret = 0; - - for (do_parity = ios->layout->parity; do_parity; --do_parity) { - struct ore_per_dev_state *per_dev; - - per_dev = &ios->per_dev[dev - first_dev]; - if (!per_dev->length && !per_dev->offset) { - /* 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, - do_parity == 1); - if (unlikely(ret)) - break; - - if (do_parity != 1) { - dev = ((dev + mirrors_p1) % devs_in_group) + first_dev; - si->cur_comp = (si->cur_comp + 1) % - ios->layout->group_width; - } - } - - 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 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); - - while (length) { - struct ore_per_dev_state *per_dev = - &ios->per_dev[dev - first_dev]; - unsigned cur_len, page_off = 0; - - if (!per_dev->length && !per_dev->offset) { - /* First time initialize the per_dev info. */ - 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 { - per_dev->offset = si->obj_offset - 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; - - length -= cur_len; - - dev = ((dev + mirrors_p1) % devs_in_group) + first_dev; - 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 last stripe operate on parity comp */ - si->cur_comp = group_width - ios->layout->parity; - } - - /* In writes cur_len just means if it's the - * last one. See _ore_add_parity_unit. - */ - ret = _add_parity_units(ios, si, dev, first_dev, - mirrors_p1, devs_in_group, - ios->sp2d ? length : 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; - si->obj_offset += cur_len; - si->unit_off = 0; - } - } -out: - ios->numdevs = devs_in_group; - ios->pages_consumed = cur_pg; - return ret; -} - -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)); - 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)); - 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)); - 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_clone_fast(master_dev->bio, - GFP_KERNEL, NULL); - if (unlikely(!bio)) { - ORE_DBGMSG( - "Failed to allocate BIO size=%u\n", - master_dev->bio->bi_max_vecs); - ret = -ENOMEM; - goto out; - } - - bio->bi_disk = 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_set_op_attrs(bio, REQ_OP_WRITE, 0); - } - - osd_req_write(or, _ios_obj(ios, cur_comp), - 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, cur_comp)->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, cur_comp), - 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, cur_comp)->id), - _LLU(per_dev->offset), - _LLU(ios->length), per_dev->dev); - } else { - osd_req_set_attributes(or, _ios_obj(ios, cur_comp)); - ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", - _LLU(_ios_obj(ios, cur_comp)->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)); - 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)); - 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_DBGMSG2("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); |
