584 lines
15 KiB
C
584 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BCACHE_UTIL_H
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#define _BCACHE_UTIL_H
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#include <linux/blkdev.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched/clock.h>
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#include <linux/llist.h>
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#include <linux/ratelimit.h>
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#include <linux/vmalloc.h>
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#include <linux/workqueue.h>
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#include <linux/crc64.h>
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#include "closure.h"
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#define PAGE_SECTORS (PAGE_SIZE / 512)
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struct closure;
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#ifdef CONFIG_BCACHE_DEBUG
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#define EBUG_ON(cond) BUG_ON(cond)
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#define atomic_dec_bug(v) BUG_ON(atomic_dec_return(v) < 0)
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#define atomic_inc_bug(v, i) BUG_ON(atomic_inc_return(v) <= i)
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#else /* DEBUG */
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#define EBUG_ON(cond) do { if (cond); } while (0)
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#define atomic_dec_bug(v) atomic_dec(v)
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#define atomic_inc_bug(v, i) atomic_inc(v)
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#endif
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#define DECLARE_HEAP(type, name) \
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struct { \
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size_t size, used; \
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type *data; \
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} name
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#define init_heap(heap, _size, gfp) \
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({ \
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size_t _bytes; \
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(heap)->used = 0; \
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(heap)->size = (_size); \
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_bytes = (heap)->size * sizeof(*(heap)->data); \
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(heap)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL); \
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(heap)->data; \
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})
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#define free_heap(heap) \
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do { \
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kvfree((heap)->data); \
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(heap)->data = NULL; \
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} while (0)
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#define heap_swap(h, i, j) swap((h)->data[i], (h)->data[j])
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#define heap_sift(h, i, cmp) \
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do { \
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size_t _r, _j = i; \
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\
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for (; _j * 2 + 1 < (h)->used; _j = _r) { \
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_r = _j * 2 + 1; \
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if (_r + 1 < (h)->used && \
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cmp((h)->data[_r], (h)->data[_r + 1])) \
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_r++; \
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\
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if (cmp((h)->data[_r], (h)->data[_j])) \
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break; \
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heap_swap(h, _r, _j); \
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} \
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} while (0)
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#define heap_sift_down(h, i, cmp) \
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do { \
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while (i) { \
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size_t p = (i - 1) / 2; \
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if (cmp((h)->data[i], (h)->data[p])) \
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break; \
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heap_swap(h, i, p); \
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i = p; \
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} \
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} while (0)
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#define heap_add(h, d, cmp) \
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({ \
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bool _r = !heap_full(h); \
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if (_r) { \
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size_t _i = (h)->used++; \
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(h)->data[_i] = d; \
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\
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heap_sift_down(h, _i, cmp); \
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heap_sift(h, _i, cmp); \
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} \
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_r; \
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})
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#define heap_pop(h, d, cmp) \
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({ \
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bool _r = (h)->used; \
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if (_r) { \
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(d) = (h)->data[0]; \
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(h)->used--; \
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heap_swap(h, 0, (h)->used); \
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heap_sift(h, 0, cmp); \
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} \
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_r; \
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})
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#define heap_peek(h) ((h)->used ? (h)->data[0] : NULL)
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#define heap_full(h) ((h)->used == (h)->size)
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#define heap_empty(h) ((h)->used == 0)
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#define DECLARE_FIFO(type, name) \
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struct { \
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size_t front, back, size, mask; \
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type *data; \
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} name
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#define fifo_for_each(c, fifo, iter) \
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for (iter = (fifo)->front; \
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c = (fifo)->data[iter], iter != (fifo)->back; \
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iter = (iter + 1) & (fifo)->mask)
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#define __init_fifo(fifo, gfp) \
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({ \
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size_t _allocated_size, _bytes; \
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BUG_ON(!(fifo)->size); \
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\
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_allocated_size = roundup_pow_of_two((fifo)->size + 1); \
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_bytes = _allocated_size * sizeof(*(fifo)->data); \
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\
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(fifo)->mask = _allocated_size - 1; \
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(fifo)->front = (fifo)->back = 0; \
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\
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(fifo)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL); \
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(fifo)->data; \
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})
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#define init_fifo_exact(fifo, _size, gfp) \
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({ \
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(fifo)->size = (_size); \
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__init_fifo(fifo, gfp); \
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})
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#define init_fifo(fifo, _size, gfp) \
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({ \
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(fifo)->size = (_size); \
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if ((fifo)->size > 4) \
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(fifo)->size = roundup_pow_of_two((fifo)->size) - 1; \
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__init_fifo(fifo, gfp); \
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})
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#define free_fifo(fifo) \
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do { \
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kvfree((fifo)->data); \
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(fifo)->data = NULL; \
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} while (0)
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#define fifo_used(fifo) (((fifo)->back - (fifo)->front) & (fifo)->mask)
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#define fifo_free(fifo) ((fifo)->size - fifo_used(fifo))
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#define fifo_empty(fifo) (!fifo_used(fifo))
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#define fifo_full(fifo) (!fifo_free(fifo))
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#define fifo_front(fifo) ((fifo)->data[(fifo)->front])
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#define fifo_back(fifo) \
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((fifo)->data[((fifo)->back - 1) & (fifo)->mask])
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#define fifo_idx(fifo, p) (((p) - &fifo_front(fifo)) & (fifo)->mask)
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#define fifo_push_back(fifo, i) \
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({ \
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bool _r = !fifo_full((fifo)); \
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if (_r) { \
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(fifo)->data[(fifo)->back++] = (i); \
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(fifo)->back &= (fifo)->mask; \
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} \
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_r; \
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})
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#define fifo_pop_front(fifo, i) \
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({ \
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bool _r = !fifo_empty((fifo)); \
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if (_r) { \
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(i) = (fifo)->data[(fifo)->front++]; \
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(fifo)->front &= (fifo)->mask; \
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} \
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_r; \
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})
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#define fifo_push_front(fifo, i) \
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({ \
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bool _r = !fifo_full((fifo)); \
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if (_r) { \
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--(fifo)->front; \
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(fifo)->front &= (fifo)->mask; \
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(fifo)->data[(fifo)->front] = (i); \
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} \
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_r; \
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})
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#define fifo_pop_back(fifo, i) \
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({ \
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bool _r = !fifo_empty((fifo)); \
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if (_r) { \
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--(fifo)->back; \
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(fifo)->back &= (fifo)->mask; \
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(i) = (fifo)->data[(fifo)->back] \
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} \
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_r; \
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})
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#define fifo_push(fifo, i) fifo_push_back(fifo, (i))
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#define fifo_pop(fifo, i) fifo_pop_front(fifo, (i))
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#define fifo_swap(l, r) \
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do { \
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swap((l)->front, (r)->front); \
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swap((l)->back, (r)->back); \
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swap((l)->size, (r)->size); \
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swap((l)->mask, (r)->mask); \
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swap((l)->data, (r)->data); \
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} while (0)
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#define fifo_move(dest, src) \
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do { \
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typeof(*((dest)->data)) _t; \
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while (!fifo_full(dest) && \
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fifo_pop(src, _t)) \
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fifo_push(dest, _t); \
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} while (0)
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/*
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* Simple array based allocator - preallocates a number of elements and you can
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* never allocate more than that, also has no locking.
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*
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* Handy because if you know you only need a fixed number of elements you don't
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* have to worry about memory allocation failure, and sometimes a mempool isn't
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* what you want.
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*
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* We treat the free elements as entries in a singly linked list, and the
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* freelist as a stack - allocating and freeing push and pop off the freelist.
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*/
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#define DECLARE_ARRAY_ALLOCATOR(type, name, size) \
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struct { \
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type *freelist; \
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type data[size]; \
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} name
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#define array_alloc(array) \
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({ \
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typeof((array)->freelist) _ret = (array)->freelist; \
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\
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if (_ret) \
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(array)->freelist = *((typeof((array)->freelist) *) _ret);\
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\
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_ret; \
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})
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#define array_free(array, ptr) \
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do { \
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typeof((array)->freelist) _ptr = ptr; \
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\
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*((typeof((array)->freelist) *) _ptr) = (array)->freelist; \
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(array)->freelist = _ptr; \
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} while (0)
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#define array_allocator_init(array) \
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do { \
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typeof((array)->freelist) _i; \
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\
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BUILD_BUG_ON(sizeof((array)->data[0]) < sizeof(void *)); \
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(array)->freelist = NULL; \
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\
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for (_i = (array)->data; \
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_i < (array)->data + ARRAY_SIZE((array)->data); \
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_i++) \
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array_free(array, _i); \
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} while (0)
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#define array_freelist_empty(array) ((array)->freelist == NULL)
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#define ANYSINT_MAX(t) \
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((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
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int bch_strtoint_h(const char *cp, int *res);
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int bch_strtouint_h(const char *cp, unsigned int *res);
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int bch_strtoll_h(const char *cp, long long *res);
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int bch_strtoull_h(const char *cp, unsigned long long *res);
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static inline int bch_strtol_h(const char *cp, long *res)
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{
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#if BITS_PER_LONG == 32
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return bch_strtoint_h(cp, (int *) res);
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#else
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return bch_strtoll_h(cp, (long long *) res);
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#endif
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}
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static inline int bch_strtoul_h(const char *cp, long *res)
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{
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#if BITS_PER_LONG == 32
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return bch_strtouint_h(cp, (unsigned int *) res);
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#else
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return bch_strtoull_h(cp, (unsigned long long *) res);
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#endif
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}
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#define strtoi_h(cp, res) \
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(__builtin_types_compatible_p(typeof(*res), int) \
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? bch_strtoint_h(cp, (void *) res) \
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: __builtin_types_compatible_p(typeof(*res), long) \
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? bch_strtol_h(cp, (void *) res) \
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: __builtin_types_compatible_p(typeof(*res), long long) \
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? bch_strtoll_h(cp, (void *) res) \
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: __builtin_types_compatible_p(typeof(*res), unsigned int) \
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? bch_strtouint_h(cp, (void *) res) \
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: __builtin_types_compatible_p(typeof(*res), unsigned long) \
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? bch_strtoul_h(cp, (void *) res) \
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: __builtin_types_compatible_p(typeof(*res), unsigned long long)\
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? bch_strtoull_h(cp, (void *) res) : -EINVAL)
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#define strtoul_safe(cp, var) \
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({ \
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unsigned long _v; \
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int _r = kstrtoul(cp, 10, &_v); \
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if (!_r) \
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var = _v; \
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_r; \
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})
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#define strtoul_safe_clamp(cp, var, min, max) \
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({ \
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unsigned long _v; \
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int _r = kstrtoul(cp, 10, &_v); \
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if (!_r) \
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var = clamp_t(typeof(var), _v, min, max); \
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_r; \
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})
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#define snprint(buf, size, var) \
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snprintf(buf, size, \
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__builtin_types_compatible_p(typeof(var), int) \
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? "%i\n" : \
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__builtin_types_compatible_p(typeof(var), unsigned int) \
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? "%u\n" : \
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__builtin_types_compatible_p(typeof(var), long) \
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? "%li\n" : \
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__builtin_types_compatible_p(typeof(var), unsigned long)\
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? "%lu\n" : \
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__builtin_types_compatible_p(typeof(var), int64_t) \
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? "%lli\n" : \
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__builtin_types_compatible_p(typeof(var), uint64_t) \
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? "%llu\n" : \
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__builtin_types_compatible_p(typeof(var), const char *) \
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? "%s\n" : "%i\n", var)
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ssize_t bch_hprint(char *buf, int64_t v);
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bool bch_is_zero(const char *p, size_t n);
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int bch_parse_uuid(const char *s, char *uuid);
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struct time_stats {
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spinlock_t lock;
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/*
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* all fields are in nanoseconds, averages are ewmas stored left shifted
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* by 8
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*/
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uint64_t max_duration;
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uint64_t average_duration;
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uint64_t average_frequency;
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uint64_t last;
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};
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void bch_time_stats_update(struct time_stats *stats, uint64_t time);
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static inline unsigned int local_clock_us(void)
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{
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return local_clock() >> 10;
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}
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#define NSEC_PER_ns 1L
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#define NSEC_PER_us NSEC_PER_USEC
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#define NSEC_PER_ms NSEC_PER_MSEC
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#define NSEC_PER_sec NSEC_PER_SEC
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#define __print_time_stat(stats, name, stat, units) \
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sysfs_print(name ## _ ## stat ## _ ## units, \
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div_u64((stats)->stat >> 8, NSEC_PER_ ## units))
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#define sysfs_print_time_stats(stats, name, \
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frequency_units, \
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duration_units) \
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do { \
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__print_time_stat(stats, name, \
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average_frequency, frequency_units); \
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__print_time_stat(stats, name, \
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average_duration, duration_units); \
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sysfs_print(name ## _ ##max_duration ## _ ## duration_units, \
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div_u64((stats)->max_duration, \
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NSEC_PER_ ## duration_units)); \
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\
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sysfs_print(name ## _last_ ## frequency_units, (stats)->last \
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? div_s64(local_clock() - (stats)->last, \
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NSEC_PER_ ## frequency_units) \
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: -1LL); \
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} while (0)
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#define sysfs_time_stats_attribute(name, \
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frequency_units, \
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duration_units) \
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read_attribute(name ## _average_frequency_ ## frequency_units); \
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read_attribute(name ## _average_duration_ ## duration_units); \
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read_attribute(name ## _max_duration_ ## duration_units); \
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read_attribute(name ## _last_ ## frequency_units)
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#define sysfs_time_stats_attribute_list(name, \
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frequency_units, \
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duration_units) \
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&sysfs_ ## name ## _average_frequency_ ## frequency_units, \
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&sysfs_ ## name ## _average_duration_ ## duration_units, \
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&sysfs_ ## name ## _max_duration_ ## duration_units, \
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&sysfs_ ## name ## _last_ ## frequency_units,
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#define ewma_add(ewma, val, weight, factor) \
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({ \
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(ewma) *= (weight) - 1; \
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(ewma) += (val) << factor; \
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(ewma) /= (weight); \
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(ewma) >> factor; \
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})
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struct bch_ratelimit {
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/* Next time we want to do some work, in nanoseconds */
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uint64_t next;
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|
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/*
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* Rate at which we want to do work, in units per second
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* The units here correspond to the units passed to bch_next_delay()
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*/
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atomic_long_t rate;
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};
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static inline void bch_ratelimit_reset(struct bch_ratelimit *d)
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{
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d->next = local_clock();
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}
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uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done);
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#define __DIV_SAFE(n, d, zero) \
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({ \
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typeof(n) _n = (n); \
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typeof(d) _d = (d); \
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_d ? _n / _d : zero; \
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})
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#define DIV_SAFE(n, d) __DIV_SAFE(n, d, 0)
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#define container_of_or_null(ptr, type, member) \
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({ \
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typeof(ptr) _ptr = ptr; \
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_ptr ? container_of(_ptr, type, member) : NULL; \
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})
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#define RB_INSERT(root, new, member, cmp) \
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({ \
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__label__ dup; \
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struct rb_node **n = &(root)->rb_node, *parent = NULL; \
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typeof(new) this; \
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int res, ret = -1; \
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\
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while (*n) { \
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parent = *n; \
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this = container_of(*n, typeof(*(new)), member); \
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res = cmp(new, this); \
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if (!res) \
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goto dup; \
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n = res < 0 \
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? &(*n)->rb_left \
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: &(*n)->rb_right; \
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} \
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\
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rb_link_node(&(new)->member, parent, n); \
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rb_insert_color(&(new)->member, root); \
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ret = 0; \
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|
dup: \
|
|
ret; \
|
|
})
|
|
|
|
#define RB_SEARCH(root, search, member, cmp) \
|
|
({ \
|
|
struct rb_node *n = (root)->rb_node; \
|
|
typeof(&(search)) this, ret = NULL; \
|
|
int res; \
|
|
\
|
|
while (n) { \
|
|
this = container_of(n, typeof(search), member); \
|
|
res = cmp(&(search), this); \
|
|
if (!res) { \
|
|
ret = this; \
|
|
break; \
|
|
} \
|
|
n = res < 0 \
|
|
? n->rb_left \
|
|
: n->rb_right; \
|
|
} \
|
|
ret; \
|
|
})
|
|
|
|
#define RB_GREATER(root, search, member, cmp) \
|
|
({ \
|
|
struct rb_node *n = (root)->rb_node; \
|
|
typeof(&(search)) this, ret = NULL; \
|
|
int res; \
|
|
\
|
|
while (n) { \
|
|
this = container_of(n, typeof(search), member); \
|
|
res = cmp(&(search), this); \
|
|
if (res < 0) { \
|
|
ret = this; \
|
|
n = n->rb_left; \
|
|
} else \
|
|
n = n->rb_right; \
|
|
} \
|
|
ret; \
|
|
})
|
|
|
|
#define RB_FIRST(root, type, member) \
|
|
container_of_or_null(rb_first(root), type, member)
|
|
|
|
#define RB_LAST(root, type, member) \
|
|
container_of_or_null(rb_last(root), type, member)
|
|
|
|
#define RB_NEXT(ptr, member) \
|
|
container_of_or_null(rb_next(&(ptr)->member), typeof(*ptr), member)
|
|
|
|
#define RB_PREV(ptr, member) \
|
|
container_of_or_null(rb_prev(&(ptr)->member), typeof(*ptr), member)
|
|
|
|
static inline uint64_t bch_crc64(const void *p, size_t len)
|
|
{
|
|
uint64_t crc = 0xffffffffffffffffULL;
|
|
|
|
crc = crc64_be(crc, p, len);
|
|
return crc ^ 0xffffffffffffffffULL;
|
|
}
|
|
|
|
static inline uint64_t bch_crc64_update(uint64_t crc,
|
|
const void *p,
|
|
size_t len)
|
|
{
|
|
crc = crc64_be(crc, p, len);
|
|
return crc;
|
|
}
|
|
|
|
/* Does linear interpolation between powers of two */
|
|
static inline unsigned int fract_exp_two(unsigned int x,
|
|
unsigned int fract_bits)
|
|
{
|
|
unsigned int fract = x & ~(~0 << fract_bits);
|
|
|
|
x >>= fract_bits;
|
|
x = 1 << x;
|
|
x += (x * fract) >> fract_bits;
|
|
|
|
return x;
|
|
}
|
|
|
|
void bch_bio_map(struct bio *bio, void *base);
|
|
int bch_bio_alloc_pages(struct bio *bio, gfp_t gfp_mask);
|
|
|
|
static inline sector_t bdev_sectors(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_inode->i_size >> 9;
|
|
}
|
|
#endif /* _BCACHE_UTIL_H */
|