| 1 | /*
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| 2 | * Copyright (c) 2025 Miroslav Cimerman <mc@doas.su>
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup hr
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | */
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| 35 |
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| 36 | #ifndef _HR_STRIPE_H
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| 37 | #define _HR_STRIPE_H
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| 38 |
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| 39 | #include <fibril_synch.h>
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| 40 | #include <errno.h>
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| 41 | #include <hr.h>
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| 42 | #include <io/log.h>
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| 43 |
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| 44 | #include "io.h"
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| 45 | #include "var.h"
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| 46 |
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| 47 | typedef struct {
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| 48 | uint64_t start;
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| 49 | uint64_t end;
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| 50 | } range_t;
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| 51 |
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| 52 | typedef struct hr_stripe {
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| 53 | hr_volume_t *vol;
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| 54 | bool write;
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| 55 | bool subtract;
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| 56 | size_t strips_touched;
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| 57 | size_t partial_strips_touched;
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| 58 | struct {
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| 59 | range_t range;
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| 60 | uint64_t cnt;
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| 61 | uint64_t strip_off;
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| 62 | const void *data_write;
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| 63 | void *data_read;
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| 64 | } *extent_span;
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| 65 | uint64_t p_extent; /* parity extent index for this stripe */
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| 66 |
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| 67 | hr_fgroup_t *worker_group;
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| 68 |
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| 69 | errno_t rc;
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| 70 | bool abort;
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| 71 | bool done;
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| 72 |
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| 73 | fibril_mutex_t parity_lock;
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| 74 | uint8_t *parity; /* the actual parity strip */
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| 75 | uint64_t parity_size;
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| 76 |
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| 77 | /* parity writers waiting until this many parity commits */
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| 78 | size_t ps_to_be_added;
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| 79 | size_t ps_added; /* number of parities commited to stripe */
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| 80 | fibril_condvar_t ps_added_cv;
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| 81 | bool p_count_final;
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| 82 |
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| 83 | /*
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| 84 | * Possibly need 2 ranges because single IO that partially spans
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| 85 | * 2 strips and overflows to second one without creating an adjacent
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| 86 | * range results in parity not being continous.
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| 87 | *
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| 88 | * Example: 2+1 extents, 4 block strip, last extent parity
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| 89 | *
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| 90 | * E0 E1 P
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| 91 | * +----+ +----+ +-----+
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| 92 | * | | | IO | | IOP |
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| 93 | * |----| |----| |-----|
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| 94 | * | | | | | |
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| 95 | * |----| |----| |-----|
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| 96 | * | | | | | |
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| 97 | * |----| |----| |-----|
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| 98 | * | IO | | | | IOP |
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| 99 | * +----+ +----+ +-----+
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| 100 | *
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| 101 | * - need 2 parity writers
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| 102 | */
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| 103 | range_t total_height[2]; /* for knowing writing parity range(s) */
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| 104 | size_t range_count;
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| 105 | } hr_stripe_t;
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| 106 |
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| 107 | extern hr_stripe_t *hr_create_stripes(hr_volume_t *, uint64_t, size_t, bool);
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| 108 | extern void hr_destroy_stripes(hr_stripe_t *, size_t);
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| 109 | extern void hr_reset_stripe(hr_stripe_t *);
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| 110 | extern void hr_stripe_commit_parity(hr_stripe_t *, uint64_t, const void *,
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| 111 | uint64_t);
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| 112 | extern void hr_stripe_wait_for_parity_commits(hr_stripe_t *);
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| 113 | extern void hr_stripe_parity_abort(hr_stripe_t *);
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| 114 | extern void hr_execute_stripe(hr_stripe_t *, size_t);
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| 115 | extern void hr_wait_for_stripe(hr_stripe_t *);
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| 116 |
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| 117 | #endif
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| 118 |
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| 119 | /** @}
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| 120 | */
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