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20fe935358
On the quest to remove all VLAs from the kernel[1] this adjusts several cases where allocation is made after an array of structures that points back into the allocation. The allocations are changed to perform explicit calculations instead of using a Variable Length Array in a structure. Additionally, this lets Clang compile this code now, since Clang does not support VLAIS[2]. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com [2] https://lkml.kernel.org/r/CA+55aFy6h1c3_rP_bXFedsTXzwW+9Q9MfJaW7GUmMBrAp-fJ9A@mail.gmail.com [keescook@chromium.org: v2] Link: http://lkml.kernel.org/r/20180418163546.GA45794@beast Link: http://lkml.kernel.org/r/20180327203904.GA1151@beast Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Cc: Boaz Harrosh <ooo@electrozaur.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
757 lines
20 KiB
C
757 lines
20 KiB
C
/*
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* Copyright (C) 2011
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* Boaz Harrosh <ooo@electrozaur.com>
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*
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* This file is part of the objects raid engine (ore).
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*
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* It is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License
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* along with "ore". If not, write to the Free Software Foundation, Inc:
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* "Free Software Foundation <info@fsf.org>"
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*/
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#include <linux/gfp.h>
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#include <linux/async_tx.h>
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#include "ore_raid.h"
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#undef ORE_DBGMSG2
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#define ORE_DBGMSG2 ORE_DBGMSG
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static struct page *_raid_page_alloc(void)
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{
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return alloc_page(GFP_KERNEL);
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}
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static void _raid_page_free(struct page *p)
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{
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__free_page(p);
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}
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/* This struct is forward declare in ore_io_state, but is private to here.
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* It is put on ios->sp2d for RAID5/6 writes only. See _gen_xor_unit.
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*
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* __stripe_pages_2d is a 2d array of pages, and it is also a corner turn.
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* Ascending page index access is sp2d(p-minor, c-major). But storage is
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* sp2d[p-minor][c-major], so it can be properlly presented to the async-xor
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* API.
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*/
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struct __stripe_pages_2d {
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/* Cache some hot path repeated calculations */
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unsigned parity;
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unsigned data_devs;
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unsigned pages_in_unit;
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bool needed ;
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/* Array size is pages_in_unit (layout->stripe_unit / PAGE_SIZE) */
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struct __1_page_stripe {
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bool alloc;
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unsigned write_count;
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struct async_submit_ctl submit;
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struct dma_async_tx_descriptor *tx;
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/* The size of this array is data_devs + parity */
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struct page **pages;
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struct page **scribble;
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/* bool array, size of this array is data_devs */
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char *page_is_read;
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} _1p_stripes[];
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};
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/* This can get bigger then a page. So support multiple page allocations
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* _sp2d_free should be called even if _sp2d_alloc fails (by returning
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* none-zero).
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*/
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static int _sp2d_alloc(unsigned pages_in_unit, unsigned group_width,
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unsigned parity, struct __stripe_pages_2d **psp2d)
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{
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struct __stripe_pages_2d *sp2d;
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unsigned data_devs = group_width - parity;
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/*
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* Desired allocation layout is, though when larger than PAGE_SIZE,
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* each struct __alloc_1p_arrays is separately allocated:
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struct _alloc_all_bytes {
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struct __alloc_stripe_pages_2d {
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struct __stripe_pages_2d sp2d;
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struct __1_page_stripe _1p_stripes[pages_in_unit];
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} __asp2d;
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struct __alloc_1p_arrays {
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struct page *pages[group_width];
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struct page *scribble[group_width];
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char page_is_read[data_devs];
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} __a1pa[pages_in_unit];
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} *_aab;
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struct __alloc_1p_arrays *__a1pa;
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struct __alloc_1p_arrays *__a1pa_end;
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*/
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char *__a1pa;
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char *__a1pa_end;
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const size_t sizeof_stripe_pages_2d =
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sizeof(struct __stripe_pages_2d) +
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sizeof(struct __1_page_stripe) * pages_in_unit;
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const size_t sizeof__a1pa =
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ALIGN(sizeof(struct page *) * (2 * group_width) + data_devs,
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sizeof(void *));
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const size_t sizeof__a1pa_arrays = sizeof__a1pa * pages_in_unit;
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const size_t alloc_total = sizeof_stripe_pages_2d +
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sizeof__a1pa_arrays;
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unsigned num_a1pa, alloc_size, i;
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/* FIXME: check these numbers in ore_verify_layout */
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BUG_ON(sizeof_stripe_pages_2d > PAGE_SIZE);
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BUG_ON(sizeof__a1pa > PAGE_SIZE);
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/*
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* If alloc_total would be larger than PAGE_SIZE, only allocate
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* as many a1pa items as would fill the rest of the page, instead
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* of the full pages_in_unit count.
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*/
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if (alloc_total > PAGE_SIZE) {
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num_a1pa = (PAGE_SIZE - sizeof_stripe_pages_2d) / sizeof__a1pa;
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alloc_size = sizeof_stripe_pages_2d + sizeof__a1pa * num_a1pa;
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} else {
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num_a1pa = pages_in_unit;
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alloc_size = alloc_total;
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}
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*psp2d = sp2d = kzalloc(alloc_size, GFP_KERNEL);
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if (unlikely(!sp2d)) {
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ORE_DBGMSG("!! Failed to alloc sp2d size=%d\n", alloc_size);
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return -ENOMEM;
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}
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/* From here Just call _sp2d_free */
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/* Find start of a1pa area. */
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__a1pa = (char *)sp2d + sizeof_stripe_pages_2d;
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/* Find end of the _allocated_ a1pa area. */
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__a1pa_end = __a1pa + alloc_size;
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/* Allocate additionally needed a1pa items in PAGE_SIZE chunks. */
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for (i = 0; i < pages_in_unit; ++i) {
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struct __1_page_stripe *stripe = &sp2d->_1p_stripes[i];
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if (unlikely(__a1pa >= __a1pa_end)) {
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num_a1pa = min_t(unsigned, PAGE_SIZE / sizeof__a1pa,
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pages_in_unit - i);
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alloc_size = sizeof__a1pa * num_a1pa;
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__a1pa = kzalloc(alloc_size, GFP_KERNEL);
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if (unlikely(!__a1pa)) {
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ORE_DBGMSG("!! Failed to _alloc_1p_arrays=%d\n",
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num_a1pa);
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return -ENOMEM;
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}
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__a1pa_end = __a1pa + alloc_size;
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/* First *pages is marked for kfree of the buffer */
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stripe->alloc = true;
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}
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/*
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* Attach all _lp_stripes pointers to the allocation for
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* it which was either part of the original PAGE_SIZE
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* allocation or the subsequent allocation in this loop.
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*/
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stripe->pages = (void *)__a1pa;
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stripe->scribble = stripe->pages + group_width;
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stripe->page_is_read = (char *)stripe->scribble + group_width;
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__a1pa += sizeof__a1pa;
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}
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sp2d->parity = parity;
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sp2d->data_devs = data_devs;
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sp2d->pages_in_unit = pages_in_unit;
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return 0;
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}
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static void _sp2d_reset(struct __stripe_pages_2d *sp2d,
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const struct _ore_r4w_op *r4w, void *priv)
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{
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unsigned data_devs = sp2d->data_devs;
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unsigned group_width = data_devs + sp2d->parity;
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int p, c;
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if (!sp2d->needed)
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return;
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for (c = data_devs - 1; c >= 0; --c)
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for (p = sp2d->pages_in_unit - 1; p >= 0; --p) {
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struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
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if (_1ps->page_is_read[c]) {
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struct page *page = _1ps->pages[c];
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r4w->put_page(priv, page);
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_1ps->page_is_read[c] = false;
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}
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}
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for (p = 0; p < sp2d->pages_in_unit; p++) {
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struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
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memset(_1ps->pages, 0, group_width * sizeof(*_1ps->pages));
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_1ps->write_count = 0;
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_1ps->tx = NULL;
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}
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sp2d->needed = false;
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}
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static void _sp2d_free(struct __stripe_pages_2d *sp2d)
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{
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unsigned i;
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if (!sp2d)
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return;
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for (i = 0; i < sp2d->pages_in_unit; ++i) {
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if (sp2d->_1p_stripes[i].alloc)
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kfree(sp2d->_1p_stripes[i].pages);
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}
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kfree(sp2d);
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}
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static unsigned _sp2d_min_pg(struct __stripe_pages_2d *sp2d)
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{
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unsigned p;
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for (p = 0; p < sp2d->pages_in_unit; p++) {
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struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
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if (_1ps->write_count)
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return p;
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}
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return ~0;
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}
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static unsigned _sp2d_max_pg(struct __stripe_pages_2d *sp2d)
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{
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int p;
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for (p = sp2d->pages_in_unit - 1; p >= 0; --p) {
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struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
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if (_1ps->write_count)
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return p;
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}
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return ~0;
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}
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static void _gen_xor_unit(struct __stripe_pages_2d *sp2d)
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{
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unsigned p;
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unsigned tx_flags = ASYNC_TX_ACK;
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if (sp2d->parity == 1)
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tx_flags |= ASYNC_TX_XOR_ZERO_DST;
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for (p = 0; p < sp2d->pages_in_unit; p++) {
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struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
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if (!_1ps->write_count)
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continue;
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init_async_submit(&_1ps->submit, tx_flags,
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NULL, NULL, NULL, (addr_conv_t *)_1ps->scribble);
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if (sp2d->parity == 1)
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_1ps->tx = async_xor(_1ps->pages[sp2d->data_devs],
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_1ps->pages, 0, sp2d->data_devs,
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PAGE_SIZE, &_1ps->submit);
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else /* parity == 2 */
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_1ps->tx = async_gen_syndrome(_1ps->pages, 0,
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sp2d->data_devs + sp2d->parity,
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PAGE_SIZE, &_1ps->submit);
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}
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for (p = 0; p < sp2d->pages_in_unit; p++) {
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struct __1_page_stripe *_1ps = &sp2d->_1p_stripes[p];
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/* NOTE: We wait for HW synchronously (I don't have such HW
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* to test with.) Is parallelism needed with today's multi
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* cores?
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*/
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async_tx_issue_pending(_1ps->tx);
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}
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}
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void _ore_add_stripe_page(struct __stripe_pages_2d *sp2d,
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struct ore_striping_info *si, struct page *page)
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{
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struct __1_page_stripe *_1ps;
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sp2d->needed = true;
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_1ps = &sp2d->_1p_stripes[si->cur_pg];
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_1ps->pages[si->cur_comp] = page;
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++_1ps->write_count;
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si->cur_pg = (si->cur_pg + 1) % sp2d->pages_in_unit;
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/* si->cur_comp is advanced outside at main loop */
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}
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void _ore_add_sg_seg(struct ore_per_dev_state *per_dev, unsigned cur_len,
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bool not_last)
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{
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struct osd_sg_entry *sge;
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ORE_DBGMSG("dev=%d cur_len=0x%x not_last=%d cur_sg=%d "
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"offset=0x%llx length=0x%x last_sgs_total=0x%x\n",
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per_dev->dev, cur_len, not_last, per_dev->cur_sg,
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_LLU(per_dev->offset), per_dev->length,
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per_dev->last_sgs_total);
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if (!per_dev->cur_sg) {
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sge = per_dev->sglist;
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/* First time we prepare two entries */
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if (per_dev->length) {
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++per_dev->cur_sg;
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sge->offset = per_dev->offset;
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sge->len = per_dev->length;
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} else {
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/* Here the parity is the first unit of this object.
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* This happens every time we reach a parity device on
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* the same stripe as the per_dev->offset. We need to
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* just skip this unit.
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*/
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per_dev->offset += cur_len;
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return;
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}
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} else {
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/* finalize the last one */
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sge = &per_dev->sglist[per_dev->cur_sg - 1];
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sge->len = per_dev->length - per_dev->last_sgs_total;
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}
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if (not_last) {
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/* Partly prepare the next one */
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struct osd_sg_entry *next_sge = sge + 1;
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++per_dev->cur_sg;
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next_sge->offset = sge->offset + sge->len + cur_len;
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/* Save cur len so we know how mutch was added next time */
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per_dev->last_sgs_total = per_dev->length;
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next_sge->len = 0;
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} else if (!sge->len) {
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/* Optimize for when the last unit is a parity */
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--per_dev->cur_sg;
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}
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}
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static int _alloc_read_4_write(struct ore_io_state *ios)
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{
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struct ore_layout *layout = ios->layout;
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int ret;
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/* We want to only read those pages not in cache so worst case
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* is a stripe populated with every other page
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*/
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unsigned sgs_per_dev = ios->sp2d->pages_in_unit + 2;
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ret = _ore_get_io_state(layout, ios->oc,
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layout->group_width * layout->mirrors_p1,
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sgs_per_dev, 0, &ios->ios_read_4_write);
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return ret;
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}
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/* @si contains info of the to-be-inserted page. Update of @si should be
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* maintained by caller. Specificaly si->dev, si->obj_offset, ...
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*/
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static int _add_to_r4w(struct ore_io_state *ios, struct ore_striping_info *si,
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struct page *page, unsigned pg_len)
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{
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struct request_queue *q;
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struct ore_per_dev_state *per_dev;
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struct ore_io_state *read_ios;
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unsigned first_dev = si->dev - (si->dev %
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(ios->layout->group_width * ios->layout->mirrors_p1));
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unsigned comp = si->dev - first_dev;
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unsigned added_len;
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if (!ios->ios_read_4_write) {
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int ret = _alloc_read_4_write(ios);
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if (unlikely(ret))
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return ret;
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}
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read_ios = ios->ios_read_4_write;
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read_ios->numdevs = ios->layout->group_width * ios->layout->mirrors_p1;
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per_dev = &read_ios->per_dev[comp];
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if (!per_dev->length) {
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per_dev->bio = bio_kmalloc(GFP_KERNEL,
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ios->sp2d->pages_in_unit);
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if (unlikely(!per_dev->bio)) {
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ORE_DBGMSG("Failed to allocate BIO size=%u\n",
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ios->sp2d->pages_in_unit);
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return -ENOMEM;
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}
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per_dev->offset = si->obj_offset;
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per_dev->dev = si->dev;
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} else if (si->obj_offset != (per_dev->offset + per_dev->length)) {
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u64 gap = si->obj_offset - (per_dev->offset + per_dev->length);
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_ore_add_sg_seg(per_dev, gap, true);
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}
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q = osd_request_queue(ore_comp_dev(read_ios->oc, per_dev->dev));
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added_len = bio_add_pc_page(q, per_dev->bio, page, pg_len,
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si->obj_offset % PAGE_SIZE);
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if (unlikely(added_len != pg_len)) {
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ORE_DBGMSG("Failed to bio_add_pc_page bi_vcnt=%d\n",
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per_dev->bio->bi_vcnt);
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return -ENOMEM;
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}
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per_dev->length += pg_len;
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return 0;
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}
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/* read the beginning of an unaligned first page */
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static int _add_to_r4w_first_page(struct ore_io_state *ios, struct page *page)
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{
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struct ore_striping_info si;
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unsigned pg_len;
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ore_calc_stripe_info(ios->layout, ios->offset, 0, &si);
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pg_len = si.obj_offset % PAGE_SIZE;
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si.obj_offset -= pg_len;
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ORE_DBGMSG("offset=0x%llx len=0x%x index=0x%lx dev=%x\n",
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_LLU(si.obj_offset), pg_len, page->index, si.dev);
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return _add_to_r4w(ios, &si, page, pg_len);
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}
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/* read the end of an incomplete last page */
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static int _add_to_r4w_last_page(struct ore_io_state *ios, u64 *offset)
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{
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struct ore_striping_info si;
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struct page *page;
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unsigned pg_len, p, c;
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ore_calc_stripe_info(ios->layout, *offset, 0, &si);
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p = si.cur_pg;
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c = si.cur_comp;
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page = ios->sp2d->_1p_stripes[p].pages[c];
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pg_len = PAGE_SIZE - (si.unit_off % PAGE_SIZE);
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*offset += pg_len;
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ORE_DBGMSG("p=%d, c=%d next-offset=0x%llx len=0x%x dev=%x par_dev=%d\n",
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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);
|
|
}
|