+++ /dev/null
-/*
- * 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);
projects / linux-2.6-microblaze.git / blobdiff