+++ /dev/null
-/*
- * Copyright (C) 2011
- * Boaz Harrosh <ooo@electrozaur.com>
- *
- * This file is part of the objects raid engine (ore).
- *
- * It is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- *
- * You should have received a copy of the GNU General Public License
- * along with "ore". If not, write to the Free Software Foundation, Inc:
- * "Free Software Foundation <info@fsf.org>"
- */
-
-#include <linux/gfp.h>
-#include <linux/async_tx.h>
-
-#include "ore_raid.h"
-
-#undef ORE_DBGMSG2
-#define ORE_DBGMSG2 ORE_DBGMSG
-
-static struct page *_raid_page_alloc(void)
-{
- return alloc_page(GFP_KERNEL);
-}
-
-static void _raid_page_free(struct page *p)
-{
- __free_page(p);
-}
-
-/* This struct is forward declare in ore_io_state, but is private to here.
- * It is put on ios->sp2d for RAID5/6 writes only. See _gen_xor_unit.
- *
- * __stripe_pages_2d is a 2d array of pages, and it is also a corner turn.
- * Ascending page index access is sp2d(p-minor, c-major). But storage is
- * sp2d[p-minor][c-major], so it can be properlly presented to the async-xor
- * API.
- */
-struct __stripe_pages_2d {
- /* Cache some hot path repeated calculations */
- unsigned parity;
- unsigned data_devs;
- unsigned pages_in_unit;
-
- bool needed ;
-
- /* Array size is pages_in_unit (layout->stripe_unit / PAGE_SIZE) */
- struct __1_page_stripe {
- bool alloc;
- unsigned write_count;
- struct async_submit_ctl submit;
- struct dma_async_tx_descriptor *tx;
-
- /* The size of this array is data_devs + parity */
- struct page **pages;
- struct page **scribble;
- /* bool array, size of this array is data_devs */
- char *page_is_read;
- } _1p_stripes[];
-};
-
-/* This can get bigger then a page. So support multiple page allocations
- * _sp2d_free should be called even if _sp2d_alloc fails (by returning
- * none-zero).
- */
-static int _sp2d_alloc(unsigned pages_in_unit, unsigned group_width,
- unsigned parity, struct __stripe_pages_2d **psp2d)
-{
- struct __stripe_pages_2d *sp2d;
- unsigned data_devs = group_width - parity;
-
- /*
- * Desired allocation layout is, though when larger than PAGE_SIZE,
- * each struct __alloc_1p_arrays is separately allocated:
-
- struct _alloc_all_bytes {
- struct __alloc_stripe_pages_2d {
- struct __stripe_pages_2d sp2d;
- struct __1_page_stripe _1p_stripes[pages_in_unit];
- } __asp2d;
- struct __alloc_1p_arrays {
- struct page *pages[group_width];
- struct page *scribble[group_width];
- char page_is_read[data_devs];
- } __a1pa[pages_in_unit];
- } *_aab;
-
- struct __alloc_1p_arrays *__a1pa;
- struct __alloc_1p_arrays *__a1pa_end;
-
- */
-
- char *__a1pa;
- char *__a1pa_end;
-
- const size_t sizeof_stripe_pages_2d =
- sizeof(struct __stripe_pages_2d) +
- sizeof(struct __1_page_stripe) * pages_in_unit;
- const size_t sizeof__a1pa =
- ALIGN(sizeof(struct page *) * (2 * group_width) + data_devs,
- sizeof(void *));
- const size_t sizeof__a1pa_arrays = sizeof__a1pa * pages_in_unit;
- const size_t alloc_total = sizeof_stripe_pages_2d +
- sizeof__a1pa_arrays;
-
- unsigned num_a1pa, alloc_size, i;
-
- /* FIXME: check these numbers in ore_verify_layout */
- BUG_ON(sizeof_stripe_pages_2d > PAGE_SIZE);
- BUG_ON(sizeof__a1pa > PAGE_SIZE);
-
- /*
- * If alloc_total would be larger than PAGE_SIZE, only allocate
- * as many a1pa items as would fill the rest of the page, instead
- * of the full pages_in_unit count.
- */
- if (alloc_total > PAGE_SIZE) {
- num_a1pa = (PAGE_SIZE - sizeof_stripe_pages_2d) / sizeof__a1pa;
- alloc_size = sizeof_stripe_pages_2d + sizeof__a1pa * num_a1pa;
- } else {
- num_a1pa = pages_in_unit;
- alloc_size = alloc_total;
- }
-
- *psp2d = sp2d = kzalloc(alloc_size, GFP_KERNEL);
- if (unlikely(!sp2d)) {
- ORE_DBGMSG("!! Failed to alloc sp2d size=%d\n", alloc_size);
- return -ENOMEM;
- }
- /* From here Just call _sp2d_free */
-
- /* Find start of a1pa area. */
- __a1pa = (char *)sp2d + sizeof_stripe_pages_2d;
- /* Find end of the _allocated_ a1pa area. */
- __a1pa_end = __a1pa + alloc_size;
-
- /* Allocate additionally needed a1pa items in PAGE_SIZE chunks. */
- for (i = 0; i < pages_in_unit; ++i) {
- struct __1_page_stripe *stripe = &sp2d->_1p_stripes[i];
-
- if (unlikely(__a1pa >= __a1pa_end)) {
- num_a1pa = min_t(unsigned, PAGE_SIZE / sizeof__a1pa,
- pages_in_unit - i);
- alloc_size = sizeof__a1pa * num_a1pa;
-
- __a1pa = kzalloc(alloc_size, GFP_KERNEL);
- if (unlikely(!__a1pa)) {
- ORE_DBGMSG("!! Failed to _alloc_1p_arrays=%d\n",
- num_a1pa);
- return -ENOMEM;
- }
- __a1pa_end = __a1pa + alloc_size;
- /* First *pages is marked for kfree of the buffer */
- stripe->alloc = true;
- }
-
- /*
- * Attach all _lp_stripes pointers to the allocation for
- * it which was either part of the original PAGE_SIZE
- * allocation or the subsequent allocation in this loop.
- */
- stripe->pages = (void *)__a1pa;
- stripe->scribble = stripe->pages + group_width;
- stripe->page_is_read = (char *)stripe->scribble + group_width;
- __a1pa += sizeof__a1pa;
- }
-
- sp2d->parity = parity;
- sp2d->data_devs = data_devs;
- sp2d->pages_in_unit = pages_in_unit;
- return 0;
-}
-
-static void _sp2d_reset(struct __stripe_pages_2d *sp2d,
- const struct _ore_r4w_op *r4w, void *priv)
-{
- unsigned data_devs = sp2d->data_devs;
- unsigned group_width = data_devs + sp2d->parity;
- int p, c;
-
- if (!sp2d->needed)
- return;
-
- for (c = data_devs - 1; c >= 0; --c)
- for (p = sp2d->pages_in_unit - 1; p >= 0; --p) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
-
- if (_1ps->page_is_read[c]) {
- struct page *page = _1ps->pages[c];
-
- r4w->put_page(priv, page);
- _1ps->page_is_read[c] = false;
- }
- }
-
- for (p = 0; p < sp2d->pages_in_unit; p++) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
-
- memset(_1ps->pages, 0, group_width * sizeof(*_1ps->pages));
- _1ps->write_count = 0;
- _1ps->tx = NULL;
- }
-
- sp2d->needed = false;
-}
-
-static void _sp2d_free(struct __stripe_pages_2d *sp2d)
-{
- unsigned i;
-
- if (!sp2d)
- return;
-
- for (i = 0; i < sp2d->pages_in_unit; ++i) {
- if (sp2d->_1p_stripes[i].alloc)
- kfree(sp2d->_1p_stripes[i].pages);
- }
-
- kfree(sp2d);
-}
-
-static unsigned _sp2d_min_pg(struct __stripe_pages_2d *sp2d)
-{
- unsigned p;
-
- for (p = 0; p < sp2d->pages_in_unit; p++) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
-
- if (_1ps->write_count)
- return p;
- }
-
- return ~0;
-}
-
-static unsigned _sp2d_max_pg(struct __stripe_pages_2d *sp2d)
-{
- int p;
-
- for (p = sp2d->pages_in_unit - 1; p >= 0; --p) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
-
- if (_1ps->write_count)
- return p;
- }
-
- return ~0;
-}
-
-static void _gen_xor_unit(struct __stripe_pages_2d *sp2d)
-{
- unsigned p;
- unsigned tx_flags = ASYNC_TX_ACK;
-
- if (sp2d->parity == 1)
- tx_flags |= ASYNC_TX_XOR_ZERO_DST;
-
- for (p = 0; p < sp2d->pages_in_unit; p++) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
-
- if (!_1ps->write_count)
- continue;
-
- init_async_submit(&_1ps->submit, tx_flags,
- NULL, NULL, NULL, (addr_conv_t *)_1ps->scribble);
-
- if (sp2d->parity == 1)
- _1ps->tx = async_xor(_1ps->pages[sp2d->data_devs],
- _1ps->pages, 0, sp2d->data_devs,
- PAGE_SIZE, &_1ps->submit);
- else /* parity == 2 */
- _1ps->tx = async_gen_syndrome(_1ps->pages, 0,
- sp2d->data_devs + sp2d->parity,
- PAGE_SIZE, &_1ps->submit);
- }
-
- for (p = 0; p < sp2d->pages_in_unit; p++) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
- /* NOTE: We wait for HW synchronously (I don't have such HW
- * to test with.) Is parallelism needed with today's multi
- * cores?
- */
- async_tx_issue_pending(_1ps->tx);
- }
-}
-
-void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
- struct ore_striping_info *si, struct page *page)
-{
- struct __1_page_stripe *_1ps;
-
- sp2d->needed = true;
-
- _1ps = &sp2d->_1p_stripes[si->cur_pg];
- _1ps->pages[si->cur_comp] = page;
- ++_1ps->write_count;
-
- si->cur_pg = (si->cur_pg + 1) % sp2d->pages_in_unit;
- /* si->cur_comp is advanced outside at main loop */
-}
-
-void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
- bool not_last)
-{
- struct osd_sg_entry *sge;
-
- ORE_DBGMSG("dev=%d cur_len=0x%x not_last=%d cur_sg=%d "
- "offset=0x%llx length=0x%x last_sgs_total=0x%x\n",
- per_dev->dev, cur_len, not_last, per_dev->cur_sg,
- _LLU(per_dev->offset), per_dev->length,
- per_dev->last_sgs_total);
-
- if (!per_dev->cur_sg) {
- sge = per_dev->sglist;
-
- /* First time we prepare two entries */
- if (per_dev->length) {
- ++per_dev->cur_sg;
- sge->offset = per_dev->offset;
- sge->len = per_dev->length;
- } else {
- /* Here the parity is the first unit of this object.
- * This happens every time we reach a parity device on
- * the same stripe as the per_dev->offset. We need to
- * just skip this unit.
- */
- per_dev->offset += cur_len;
- return;
- }
- } else {
- /* finalize the last one */
- sge = &per_dev->sglist[per_dev->cur_sg - 1];
- sge->len = per_dev->length - per_dev->last_sgs_total;
- }
-
- if (not_last) {
- /* Partly prepare the next one */
- struct osd_sg_entry *next_sge = sge + 1;
-
- ++per_dev->cur_sg;
- next_sge->offset = sge->offset + sge->len + cur_len;
- /* Save cur len so we know how mutch was added next time */
- per_dev->last_sgs_total = per_dev->length;
- next_sge->len = 0;
- } else if (!sge->len) {
- /* Optimize for when the last unit is a parity */
- --per_dev->cur_sg;
- }
-}
-
-static int _alloc_read_4_write(struct ore_io_state *ios)
-{
- struct ore_layout *layout = ios->layout;
- int ret;
- /* We want to only read those pages not in cache so worst case
- * is a stripe populated with every other page
- */
- unsigned sgs_per_dev = ios->sp2d->pages_in_unit + 2;
-
- ret = _ore_get_io_state(layout, ios->oc,
- layout->group_width * layout->mirrors_p1,
- sgs_per_dev, 0, &ios->ios_read_4_write);
- return ret;
-}
-
-/* @si contains info of the to-be-inserted page. Update of @si should be
- * maintained by caller. Specificaly si->dev, si->obj_offset, ...
- */
-static int _add_to_r4w(struct ore_io_state *ios, struct ore_striping_info *si,
- struct page *page, unsigned pg_len)
-{
- struct request_queue *q;
- struct ore_per_dev_state *per_dev;
- struct ore_io_state *read_ios;
- unsigned first_dev = si->dev - (si->dev %
- (ios->layout->group_width * ios->layout->mirrors_p1));
- unsigned comp = si->dev - first_dev;
- unsigned added_len;
-
- if (!ios->ios_read_4_write) {
- int ret = _alloc_read_4_write(ios);
-
- if (unlikely(ret))
- return ret;
- }
-
- read_ios = ios->ios_read_4_write;
- read_ios->numdevs = ios->layout->group_width * ios->layout->mirrors_p1;
-
- per_dev = &read_ios->per_dev[comp];
- if (!per_dev->length) {
- per_dev->bio = bio_kmalloc(GFP_KERNEL,
- ios->sp2d->pages_in_unit);
- if (unlikely(!per_dev->bio)) {
- ORE_DBGMSG("Failed to allocate BIO size=%u\n",
- ios->sp2d->pages_in_unit);
- return -ENOMEM;
- }
- per_dev->offset = si->obj_offset;
- per_dev->dev = si->dev;
- } else if (si->obj_offset != (per_dev->offset + per_dev->length)) {
- u64 gap = si->obj_offset - (per_dev->offset + per_dev->length);
-
- _ore_add_sg_seg(per_dev, gap, true);
- }
- q = osd_request_queue(ore_comp_dev(read_ios->oc, per_dev->dev));
- added_len = bio_add_pc_page(q, per_dev->bio, page, pg_len,
- si->obj_offset % PAGE_SIZE);
- if (unlikely(added_len != pg_len)) {
- ORE_DBGMSG("Failed to bio_add_pc_page bi_vcnt=%d\n",
- per_dev->bio->bi_vcnt);
- return -ENOMEM;
- }
-
- per_dev->length += pg_len;
- return 0;
-}
-
-/* read the beginning of an unaligned first page */
-static int _add_to_r4w_first_page(struct ore_io_state *ios, struct page *page)
-{
- struct ore_striping_info si;
- unsigned pg_len;
-
- ore_calc_stripe_info(ios->layout, ios->offset, 0, &si);
-
- pg_len = si.obj_offset % PAGE_SIZE;
- si.obj_offset -= pg_len;
-
- ORE_DBGMSG("offset=0x%llx len=0x%x index=0x%lx dev=%x\n",
- _LLU(si.obj_offset), pg_len, page->index, si.dev);
-
- return _add_to_r4w(ios, &si, page, pg_len);
-}
-
-/* read the end of an incomplete last page */
-static int _add_to_r4w_last_page(struct ore_io_state *ios, u64 *offset)
-{
- struct ore_striping_info si;
- struct page *page;
- unsigned pg_len, p, c;
-
- ore_calc_stripe_info(ios->layout, *offset, 0, &si);
-
- p = si.cur_pg;
- c = si.cur_comp;
- page = ios->sp2d->_1p_stripes[p].pages[c];
-
- pg_len = PAGE_SIZE - (si.unit_off % PAGE_SIZE);
- *offset += pg_len;
-
- ORE_DBGMSG("p=%d, c=%d next-offset=0x%llx len=0x%x dev=%x par_dev=%d\n",
- p, c, _LLU(*offset), pg_len, si.dev, si.par_dev);
-
- BUG_ON(!page);
-
- return _add_to_r4w(ios, &si, page, pg_len);
-}
-
-static void _mark_read4write_pages_uptodate(struct ore_io_state *ios, int ret)
-{
- struct bio_vec *bv;
- unsigned i, d;
-
- /* loop on all devices all pages */
- for (d = 0; d < ios->numdevs; d++) {
- struct bio *bio = ios->per_dev[d].bio;
-
- if (!bio)
- continue;
-
- bio_for_each_segment_all(bv, bio, i) {
- struct page *page = bv->bv_page;
-
- SetPageUptodate(page);
- if (PageError(page))
- ClearPageError(page);
- }
- }
-}
-
-/* read_4_write is hacked to read the start of the first stripe and/or
- * the end of the last stripe. If needed, with an sg-gap at each device/page.
- * It is assumed to be called after the to_be_written pages of the first stripe
- * are populating ios->sp2d[][]
- *
- * NOTE: We call ios->r4w->lock_fn for all pages needed for parity calculations
- * These pages are held at sp2d[p].pages[c] but with
- * sp2d[p].page_is_read[c] = true. At _sp2d_reset these pages are
- * ios->r4w->lock_fn(). The ios->r4w->lock_fn might signal that the page is
- * @uptodate=true, so we don't need to read it, only unlock, after IO.
- *
- * TODO: The read_4_write should calc a need_to_read_pages_count, if bigger then
- * to-be-written count, we should consider the xor-in-place mode.
- * need_to_read_pages_count is the actual number of pages not present in cache.
- * maybe "devs_in_group - ios->sp2d[p].write_count" is a good enough
- * approximation? In this mode the read pages are put in the empty places of
- * ios->sp2d[p][*], xor is calculated the same way. These pages are
- * allocated/freed and don't go through cache
- */
-static int _read_4_write_first_stripe(struct ore_io_state *ios)
-{
- struct ore_striping_info read_si;
- struct __stripe_pages_2d *sp2d = ios->sp2d;
- u64 offset = ios->si.first_stripe_start;
- unsigned c, p, min_p = sp2d->pages_in_unit, max_p = -1;
-
- if (offset == ios->offset) /* Go to start collect $200 */
- goto read_last_stripe;
-
- min_p = _sp2d_min_pg(sp2d);
- max_p = _sp2d_max_pg(sp2d);
-
- ORE_DBGMSG("stripe_start=0x%llx ios->offset=0x%llx min_p=%d max_p=%d\n",
- offset, ios->offset, min_p, max_p);
-
- for (c = 0; ; c++) {
- ore_calc_stripe_info(ios->layout, offset, 0, &read_si);
- read_si.obj_offset += min_p * PAGE_SIZE;
- offset += min_p * PAGE_SIZE;
- for (p = min_p; p <= max_p; p++) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
- struct page **pp = &_1ps->pages[c];
- bool uptodate;
-
- if (*pp) {
- if (ios->offset % PAGE_SIZE)
- /* Read the remainder of the page */
- _add_to_r4w_first_page(ios, *pp);
- /* to-be-written pages start here */
- goto read_last_stripe;
- }
-
- *pp = ios->r4w->get_page(ios->private, offset,
- &uptodate);
- if (unlikely(!*pp))
- return -ENOMEM;
-
- if (!uptodate)
- _add_to_r4w(ios, &read_si, *pp, PAGE_SIZE);
-
- /* Mark read-pages to be cache_released */
- _1ps->page_is_read[c] = true;
- read_si.obj_offset += PAGE_SIZE;
- offset += PAGE_SIZE;
- }
- offset += (sp2d->pages_in_unit - p) * PAGE_SIZE;
- }
-
-read_last_stripe:
- return 0;
-}
-
-static int _read_4_write_last_stripe(struct ore_io_state *ios)
-{
- struct ore_striping_info read_si;
- struct __stripe_pages_2d *sp2d = ios->sp2d;
- u64 offset;
- u64 last_stripe_end;
- unsigned bytes_in_stripe = ios->si.bytes_in_stripe;
- unsigned c, p, min_p = sp2d->pages_in_unit, max_p = -1;
-
- offset = ios->offset + ios->length;
- if (offset % PAGE_SIZE)
- _add_to_r4w_last_page(ios, &offset);
- /* offset will be aligned to next page */
-
- last_stripe_end = div_u64(offset + bytes_in_stripe - 1, bytes_in_stripe)
- * bytes_in_stripe;
- if (offset == last_stripe_end) /* Optimize for the aligned case */
- goto read_it;
-
- ore_calc_stripe_info(ios->layout, offset, 0, &read_si);
- p = read_si.cur_pg;
- c = read_si.cur_comp;
-
- if (min_p == sp2d->pages_in_unit) {
- /* Didn't do it yet */
- min_p = _sp2d_min_pg(sp2d);
- max_p = _sp2d_max_pg(sp2d);
- }
-
- ORE_DBGMSG("offset=0x%llx stripe_end=0x%llx min_p=%d max_p=%d\n",
- offset, last_stripe_end, min_p, max_p);
-
- while (offset < last_stripe_end) {
- struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
-
- if ((min_p <= p) && (p <= max_p)) {
- struct page *page;
- bool uptodate;
-
- BUG_ON(_1ps->pages[c]);
- page = ios->r4w->get_page(ios->private, offset,
- &uptodate);
- if (unlikely(!page))
- return -ENOMEM;
-
- _1ps->pages[c] = page;
- /* Mark read-pages to be cache_released */
- _1ps->page_is_read[c] = true;
- if (!uptodate)
- _add_to_r4w(ios, &read_si, page, PAGE_SIZE);
- }
-
- offset += PAGE_SIZE;
- if (p == (sp2d->pages_in_unit - 1)) {
- ++c;
- p = 0;
- ore_calc_stripe_info(ios->layout, offset, 0, &read_si);
- } else {
- read_si.obj_offset += PAGE_SIZE;
- ++p;
- }
- }
-
-read_it:
- return 0;
-}
-
-static int _read_4_write_execute(struct ore_io_state *ios)
-{
- struct ore_io_state *ios_read;
- unsigned i;
- int ret;
-
- ios_read = ios->ios_read_4_write;
- if (!ios_read)
- return 0;
-
- /* FIXME: Ugly to signal _sbi_read_mirror that we have bio(s). Change
- * to check for per_dev->bio
- */
- ios_read->pages = ios->pages;
-
- /* Now read these devices */
- for (i = 0; i < ios_read->numdevs; i += ios_read->layout->mirrors_p1) {
- ret = _ore_read_mirror(ios_read, i);
- if (unlikely(ret))
- return ret;
- }
-
- ret = ore_io_execute(ios_read); /* Synchronus execution */
- if (unlikely(ret)) {
- ORE_DBGMSG("!! ore_io_execute => %d\n", ret);
- return ret;
- }
-
- _mark_read4write_pages_uptodate(ios_read, ret);
- ore_put_io_state(ios_read);
- ios->ios_read_4_write = NULL; /* Might need a reuse at last stripe */
- return 0;
-}
-
-/* In writes @cur_len means length left. .i.e cur_len==0 is the last parity U */
-int _ore_add_parity_unit(struct ore_io_state *ios,
- struct ore_striping_info *si,
- struct ore_per_dev_state *per_dev,
- unsigned cur_len, bool do_xor)
-{
- if (ios->reading) {
- if (per_dev->cur_sg >= ios->sgs_per_dev) {
- ORE_DBGMSG("cur_sg(%d) >= sgs_per_dev(%d)\n" ,
- per_dev->cur_sg, ios->sgs_per_dev);
- return -ENOMEM;
- }
- _ore_add_sg_seg(per_dev, cur_len, true);
- } else {
- struct __stripe_pages_2d *sp2d = ios->sp2d;
- struct page **pages = ios->parity_pages + ios->cur_par_page;
- unsigned num_pages;
- unsigned array_start = 0;
- unsigned i;
- int ret;
-
- si->cur_pg = _sp2d_min_pg(sp2d);
- num_pages = _sp2d_max_pg(sp2d) + 1 - si->cur_pg;
-
- if (!per_dev->length) {
- per_dev->offset += si->cur_pg * PAGE_SIZE;
- /* If first stripe, Read in all read4write pages
- * (if needed) before we calculate the first parity.
- */
- if (do_xor)
- _read_4_write_first_stripe(ios);
- }
- if (!cur_len && do_xor)
- /* If last stripe r4w pages of last stripe */
- _read_4_write_last_stripe(ios);
- _read_4_write_execute(ios);
-
- for (i = 0; i < num_pages; i++) {
- pages[i] = _raid_page_alloc();
- if (unlikely(!pages[i]))
- return -ENOMEM;
-
- ++(ios->cur_par_page);
- }
-
- BUG_ON(si->cur_comp < sp2d->data_devs);
- BUG_ON(si->cur_pg + num_pages > sp2d->pages_in_unit);
-
- ret = _ore_add_stripe_unit(ios, &array_start, 0, pages,
- per_dev, num_pages * PAGE_SIZE);
- if (unlikely(ret))
- return ret;
-
- if (do_xor) {
- _gen_xor_unit(sp2d);
- _sp2d_reset(sp2d, ios->r4w, ios->private);
- }
- }
- return 0;
-}
-
-int _ore_post_alloc_raid_stuff(struct ore_io_state *ios)
-{
- if (ios->parity_pages) {
- struct ore_layout *layout = ios->layout;
- unsigned pages_in_unit = layout->stripe_unit / PAGE_SIZE;
-
- if (_sp2d_alloc(pages_in_unit, layout->group_width,
- layout->parity, &ios->sp2d)) {
- return -ENOMEM;
- }
- }
- return 0;
-}
-
-void _ore_free_raid_stuff(struct ore_io_state *ios)
-{
- if (ios->sp2d) { /* writing and raid */
- unsigned i;
-
- for (i = 0; i < ios->cur_par_page; i++) {
- struct page *page = ios->parity_pages[i];
-
- if (page)
- _raid_page_free(page);
- }
- if (ios->extra_part_alloc)
- kfree(ios->parity_pages);
- /* If IO returned an error pages might need unlocking */
- _sp2d_reset(ios->sp2d, ios->r4w, ios->private);
- _sp2d_free(ios->sp2d);
- } else {
- /* Will only be set if raid reading && sglist is big */
- if (ios->extra_part_alloc)
- kfree(ios->per_dev[0].sglist);
- }
- if (ios->ios_read_4_write)
- ore_put_io_state(ios->ios_read_4_write);
-}
projects / linux-2.6-block.git / blobdiff