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Message-Id: <1343087459-17645-9-git-send-email-koverstreet@google.com>
Date: Mon, 23 Jul 2012 16:50:51 -0700
From: Kent Overstreet <koverstreet@...gle.com>
To: linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
dm-devel@...hat.com
Cc: Kent Overstreet <koverstreet@...gle.com>, tj@...nel.org,
vgoyal@...hat.com, joe@...ches.com
Subject: [Bcache v15 08/16] bcache: Generic utility code
Much of this code should be moved out of drivers/block/bcache, but it
was originally written for bcache.
Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
---
drivers/md/bcache/util.c | 392 ++++++++++++++++++++++++++++++
drivers/md/bcache/util.h | 606 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 998 insertions(+), 0 deletions(-)
create mode 100644 drivers/md/bcache/util.c
create mode 100644 drivers/md/bcache/util.h
diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
new file mode 100644
index 0000000..e58c27f
--- /dev/null
+++ b/drivers/md/bcache/util.c
@@ -0,0 +1,392 @@
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/types.h>
+
+#include "util.h"
+
+#define simple_strtoint(c, end, base) simple_strtol(c, end, base)
+#define simple_strtouint(c, end, base) simple_strtoul(c, end, base)
+
+#define STRTO_H(name, type) \
+int name ## _h(const char *cp, type *res) \
+{ \
+ int u = 0; \
+ char *e; \
+ type i = simple_ ## name(cp, &e, 10); \
+ \
+ switch (tolower(*e)) { \
+ default: \
+ return -EINVAL; \
+ case 'y': \
+ case 'z': \
+ u++; \
+ case 'e': \
+ u++; \
+ case 'p': \
+ u++; \
+ case 't': \
+ u++; \
+ case 'g': \
+ u++; \
+ case 'm': \
+ u++; \
+ case 'k': \
+ u++; \
+ if (e++ == cp) \
+ return -EINVAL; \
+ case '\n': \
+ case '\0': \
+ if (*e == '\n') \
+ e++; \
+ } \
+ \
+ if (*e) \
+ return -EINVAL; \
+ \
+ while (u--) { \
+ if ((type) ~0 > 0 && \
+ (type) ~0 / 1024 <= i) \
+ return -EINVAL; \
+ if ((i > 0 && ANYSINT_MAX(type) / 1024 < i) || \
+ (i < 0 && -ANYSINT_MAX(type) / 1024 > i)) \
+ return -EINVAL; \
+ i *= 1024; \
+ } \
+ \
+ *res = i; \
+ return 0; \
+} \
+EXPORT_SYMBOL_GPL(name ## _h);
+
+STRTO_H(strtoint, int)
+STRTO_H(strtouint, unsigned int)
+STRTO_H(strtoll, long long)
+STRTO_H(strtoull, unsigned long long)
+
+ssize_t snprint_string_list(char *buf, size_t size, const char * const list[],
+ size_t selected)
+{
+ char *out = buf;
+ size_t i;
+
+ for (i = 0; list[i]; i++)
+ out += snprintf(out, buf + size - out,
+ i == selected ? "[%s] " : "%s ", list[i]);
+
+ out[-1] = '\n';
+ return out - buf;
+}
+EXPORT_SYMBOL_GPL(snprint_string_list);
+
+ssize_t read_string_list(const char *buf, const char * const list[])
+{
+ size_t i;
+ char *s, *d = kstrndup(buf, PAGE_SIZE - 1, GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ s = strim(d);
+
+ for (i = 0; list[i]; i++)
+ if (!strcmp(list[i], s))
+ break;
+
+ kfree(d);
+
+ if (!list[i])
+ return -EINVAL;
+
+ return i;
+}
+EXPORT_SYMBOL_GPL(read_string_list);
+
+bool is_zero(const char *p, size_t n)
+{
+ size_t i;
+
+ for (i = 0; i < n; i++)
+ if (p[i])
+ return false;
+ return true;
+}
+EXPORT_SYMBOL_GPL(is_zero);
+
+int parse_uuid(const char *s, char *uuid)
+{
+ size_t i, j, x;
+ memset(uuid, 0, 16);
+
+ for (i = 0, j = 0;
+ i < strspn(s, "-0123456789:ABCDEFabcdef") && j < 32;
+ i++) {
+ x = s[i] | 32;
+
+ switch (x) {
+ case '0'...'9':
+ x -= '0';
+ break;
+ case 'a'...'f':
+ x -= 'a' - 10;
+ break;
+ default:
+ continue;
+ }
+
+ if (!(j & 1))
+ x <<= 4;
+ uuid[j++ >> 1] |= x;
+ }
+ return i;
+}
+EXPORT_SYMBOL_GPL(parse_uuid);
+
+void time_stats_update(struct time_stats *stats, uint64_t start_time)
+{
+ uint64_t now = local_clock();
+ uint64_t duration = time_after64(now, start_time)
+ ? now - start_time : 0;
+ uint64_t last = time_after64(now, stats->last)
+ ? now - stats->last : 0;
+
+ stats->max_duration = max(stats->max_duration, duration);
+
+ if (stats->last) {
+ ewma_add(stats->average_duration, duration, 8, 8);
+
+ if (stats->average_frequency)
+ ewma_add(stats->average_frequency, last, 8, 8);
+ else
+ stats->average_frequency = last << 8;
+ } else {
+ stats->average_duration = duration << 8;
+ }
+
+ stats->last = now ?: 1;
+}
+EXPORT_SYMBOL_GPL(time_stats_update);
+
+unsigned next_delay(struct ratelimit *d, uint64_t done)
+{
+ uint64_t now = local_clock();
+
+ d->next += div_u64(done, d->rate);
+
+ return time_after64(d->next, now)
+ ? div_u64(d->next - now, NSEC_PER_SEC / HZ)
+ : 0;
+}
+EXPORT_SYMBOL_GPL(next_delay);
+
+#ifdef CONFIG_BCACHE_LATENCY_DEBUG
+unsigned latency_warn_ms;
+#endif
+
+#ifdef CONFIG_BCACHE_EDEBUG
+
+static void check_bio(struct bio *bio)
+{
+ unsigned i, size = 0;
+ struct bio_vec *bv;
+ struct request_queue *q = bdev_get_queue(bio->bi_bdev);
+
+ BUG_ON(!bio->bi_vcnt);
+ BUG_ON(!bio->bi_size);
+
+ bio_for_each_segment(bv, bio, i)
+ size += bv->bv_len;
+
+ BUG_ON(size != bio->bi_size);
+ BUG_ON(size > queue_max_sectors(q) << 9);
+
+ blk_recount_segments(q, bio);
+ BUG_ON(bio->bi_phys_segments > queue_max_segments(q));
+}
+
+#else /* EDEBUG */
+
+#define check_bio(bio) do {} while (0)
+
+#endif
+
+void bio_map(struct bio *bio, void *base)
+{
+ size_t size = bio->bi_size;
+ struct bio_vec *bv = bio->bi_io_vec;
+
+ BUG_ON(!bio->bi_size);
+ BUG_ON(bio->bi_vcnt);
+
+ bv->bv_offset = base ? ((unsigned long) base) % PAGE_SIZE : 0;
+ goto start;
+
+ for (; size; bio->bi_vcnt++, bv++) {
+ bv->bv_offset = 0;
+start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset,
+ size);
+ if (base) {
+ bv->bv_page = is_vmalloc_addr(base)
+ ? vmalloc_to_page(base)
+ : virt_to_page(base);
+
+ base += bv->bv_len;
+ }
+
+ size -= bv->bv_len;
+ }
+}
+EXPORT_SYMBOL_GPL(bio_map);
+
+int bio_alloc_pages(struct bio *bio, gfp_t gfp)
+{
+ int i;
+ struct bio_vec *bv;
+
+ bio_for_each_segment(bv, bio, i) {
+ bv->bv_page = alloc_page(gfp);
+ if (!bv->bv_page) {
+ while (bv-- != bio->bi_io_vec + bio->bi_idx)
+ __free_page(bv->bv_page);
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(bio_alloc_pages);
+
+/*
+ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
+ * use permitted, subject to terms of PostgreSQL license; see.)
+
+ * If we have a 64-bit integer type, then a 64-bit CRC looks just like the
+ * usual sort of implementation. (See Ross Williams' excellent introduction
+ * A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from
+ * ftp://ftp.rocksoft.com/papers/crc_v3.txt or several other net sites.)
+ * If we have no working 64-bit type, then fake it with two 32-bit registers.
+ *
+ * The present implementation is a normal (not "reflected", in Williams'
+ * terms) 64-bit CRC, using initial all-ones register contents and a final
+ * bit inversion. The chosen polynomial is borrowed from the DLT1 spec
+ * (ECMA-182, available from http://www.ecma.ch/ecma1/STAND/ECMA-182.HTM):
+ *
+ * x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 +
+ * x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 +
+ * x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 +
+ * x^7 + x^4 + x + 1
+*/
+
+static const uint64_t crc_table[256] = {
+ 0x0000000000000000, 0x42F0E1EBA9EA3693, 0x85E1C3D753D46D26,
+ 0xC711223CFA3E5BB5, 0x493366450E42ECDF, 0x0BC387AEA7A8DA4C,
+ 0xCCD2A5925D9681F9, 0x8E224479F47CB76A, 0x9266CC8A1C85D9BE,
+ 0xD0962D61B56FEF2D, 0x17870F5D4F51B498, 0x5577EEB6E6BB820B,
+ 0xDB55AACF12C73561, 0x99A54B24BB2D03F2, 0x5EB4691841135847,
+ 0x1C4488F3E8F96ED4, 0x663D78FF90E185EF, 0x24CD9914390BB37C,
+ 0xE3DCBB28C335E8C9, 0xA12C5AC36ADFDE5A, 0x2F0E1EBA9EA36930,
+ 0x6DFEFF5137495FA3, 0xAAEFDD6DCD770416, 0xE81F3C86649D3285,
+ 0xF45BB4758C645C51, 0xB6AB559E258E6AC2, 0x71BA77A2DFB03177,
+ 0x334A9649765A07E4, 0xBD68D2308226B08E, 0xFF9833DB2BCC861D,
+ 0x388911E7D1F2DDA8, 0x7A79F00C7818EB3B, 0xCC7AF1FF21C30BDE,
+ 0x8E8A101488293D4D, 0x499B3228721766F8, 0x0B6BD3C3DBFD506B,
+ 0x854997BA2F81E701, 0xC7B97651866BD192, 0x00A8546D7C558A27,
+ 0x4258B586D5BFBCB4, 0x5E1C3D753D46D260, 0x1CECDC9E94ACE4F3,
+ 0xDBFDFEA26E92BF46, 0x990D1F49C77889D5, 0x172F5B3033043EBF,
+ 0x55DFBADB9AEE082C, 0x92CE98E760D05399, 0xD03E790CC93A650A,
+ 0xAA478900B1228E31, 0xE8B768EB18C8B8A2, 0x2FA64AD7E2F6E317,
+ 0x6D56AB3C4B1CD584, 0xE374EF45BF6062EE, 0xA1840EAE168A547D,
+ 0x66952C92ECB40FC8, 0x2465CD79455E395B, 0x3821458AADA7578F,
+ 0x7AD1A461044D611C, 0xBDC0865DFE733AA9, 0xFF3067B657990C3A,
+ 0x711223CFA3E5BB50, 0x33E2C2240A0F8DC3, 0xF4F3E018F031D676,
+ 0xB60301F359DBE0E5, 0xDA050215EA6C212F, 0x98F5E3FE438617BC,
+ 0x5FE4C1C2B9B84C09, 0x1D14202910527A9A, 0x93366450E42ECDF0,
+ 0xD1C685BB4DC4FB63, 0x16D7A787B7FAA0D6, 0x5427466C1E109645,
+ 0x4863CE9FF6E9F891, 0x0A932F745F03CE02, 0xCD820D48A53D95B7,
+ 0x8F72ECA30CD7A324, 0x0150A8DAF8AB144E, 0x43A04931514122DD,
+ 0x84B16B0DAB7F7968, 0xC6418AE602954FFB, 0xBC387AEA7A8DA4C0,
+ 0xFEC89B01D3679253, 0x39D9B93D2959C9E6, 0x7B2958D680B3FF75,
+ 0xF50B1CAF74CF481F, 0xB7FBFD44DD257E8C, 0x70EADF78271B2539,
+ 0x321A3E938EF113AA, 0x2E5EB66066087D7E, 0x6CAE578BCFE24BED,
+ 0xABBF75B735DC1058, 0xE94F945C9C3626CB, 0x676DD025684A91A1,
+ 0x259D31CEC1A0A732, 0xE28C13F23B9EFC87, 0xA07CF2199274CA14,
+ 0x167FF3EACBAF2AF1, 0x548F120162451C62, 0x939E303D987B47D7,
+ 0xD16ED1D631917144, 0x5F4C95AFC5EDC62E, 0x1DBC74446C07F0BD,
+ 0xDAAD56789639AB08, 0x985DB7933FD39D9B, 0x84193F60D72AF34F,
+ 0xC6E9DE8B7EC0C5DC, 0x01F8FCB784FE9E69, 0x43081D5C2D14A8FA,
+ 0xCD2A5925D9681F90, 0x8FDAB8CE70822903, 0x48CB9AF28ABC72B6,
+ 0x0A3B7B1923564425, 0x70428B155B4EAF1E, 0x32B26AFEF2A4998D,
+ 0xF5A348C2089AC238, 0xB753A929A170F4AB, 0x3971ED50550C43C1,
+ 0x7B810CBBFCE67552, 0xBC902E8706D82EE7, 0xFE60CF6CAF321874,
+ 0xE224479F47CB76A0, 0xA0D4A674EE214033, 0x67C58448141F1B86,
+ 0x253565A3BDF52D15, 0xAB1721DA49899A7F, 0xE9E7C031E063ACEC,
+ 0x2EF6E20D1A5DF759, 0x6C0603E6B3B7C1CA, 0xF6FAE5C07D3274CD,
+ 0xB40A042BD4D8425E, 0x731B26172EE619EB, 0x31EBC7FC870C2F78,
+ 0xBFC9838573709812, 0xFD39626EDA9AAE81, 0x3A28405220A4F534,
+ 0x78D8A1B9894EC3A7, 0x649C294A61B7AD73, 0x266CC8A1C85D9BE0,
+ 0xE17DEA9D3263C055, 0xA38D0B769B89F6C6, 0x2DAF4F0F6FF541AC,
+ 0x6F5FAEE4C61F773F, 0xA84E8CD83C212C8A, 0xEABE6D3395CB1A19,
+ 0x90C79D3FEDD3F122, 0xD2377CD44439C7B1, 0x15265EE8BE079C04,
+ 0x57D6BF0317EDAA97, 0xD9F4FB7AE3911DFD, 0x9B041A914A7B2B6E,
+ 0x5C1538ADB04570DB, 0x1EE5D94619AF4648, 0x02A151B5F156289C,
+ 0x4051B05E58BC1E0F, 0x87409262A28245BA, 0xC5B073890B687329,
+ 0x4B9237F0FF14C443, 0x0962D61B56FEF2D0, 0xCE73F427ACC0A965,
+ 0x8C8315CC052A9FF6, 0x3A80143F5CF17F13, 0x7870F5D4F51B4980,
+ 0xBF61D7E80F251235, 0xFD913603A6CF24A6, 0x73B3727A52B393CC,
+ 0x31439391FB59A55F, 0xF652B1AD0167FEEA, 0xB4A25046A88DC879,
+ 0xA8E6D8B54074A6AD, 0xEA16395EE99E903E, 0x2D071B6213A0CB8B,
+ 0x6FF7FA89BA4AFD18, 0xE1D5BEF04E364A72, 0xA3255F1BE7DC7CE1,
+ 0x64347D271DE22754, 0x26C49CCCB40811C7, 0x5CBD6CC0CC10FAFC,
+ 0x1E4D8D2B65FACC6F, 0xD95CAF179FC497DA, 0x9BAC4EFC362EA149,
+ 0x158E0A85C2521623, 0x577EEB6E6BB820B0, 0x906FC95291867B05,
+ 0xD29F28B9386C4D96, 0xCEDBA04AD0952342, 0x8C2B41A1797F15D1,
+ 0x4B3A639D83414E64, 0x09CA82762AAB78F7, 0x87E8C60FDED7CF9D,
+ 0xC51827E4773DF90E, 0x020905D88D03A2BB, 0x40F9E43324E99428,
+ 0x2CFFE7D5975E55E2, 0x6E0F063E3EB46371, 0xA91E2402C48A38C4,
+ 0xEBEEC5E96D600E57, 0x65CC8190991CB93D, 0x273C607B30F68FAE,
+ 0xE02D4247CAC8D41B, 0xA2DDA3AC6322E288, 0xBE992B5F8BDB8C5C,
+ 0xFC69CAB42231BACF, 0x3B78E888D80FE17A, 0x7988096371E5D7E9,
+ 0xF7AA4D1A85996083, 0xB55AACF12C735610, 0x724B8ECDD64D0DA5,
+ 0x30BB6F267FA73B36, 0x4AC29F2A07BFD00D, 0x08327EC1AE55E69E,
+ 0xCF235CFD546BBD2B, 0x8DD3BD16FD818BB8, 0x03F1F96F09FD3CD2,
+ 0x41011884A0170A41, 0x86103AB85A2951F4, 0xC4E0DB53F3C36767,
+ 0xD8A453A01B3A09B3, 0x9A54B24BB2D03F20, 0x5D45907748EE6495,
+ 0x1FB5719CE1045206, 0x919735E51578E56C, 0xD367D40EBC92D3FF,
+ 0x1476F63246AC884A, 0x568617D9EF46BED9, 0xE085162AB69D5E3C,
+ 0xA275F7C11F7768AF, 0x6564D5FDE549331A, 0x279434164CA30589,
+ 0xA9B6706FB8DFB2E3, 0xEB46918411358470, 0x2C57B3B8EB0BDFC5,
+ 0x6EA7525342E1E956, 0x72E3DAA0AA188782, 0x30133B4B03F2B111,
+ 0xF7021977F9CCEAA4, 0xB5F2F89C5026DC37, 0x3BD0BCE5A45A6B5D,
+ 0x79205D0E0DB05DCE, 0xBE317F32F78E067B, 0xFCC19ED95E6430E8,
+ 0x86B86ED5267CDBD3, 0xC4488F3E8F96ED40, 0x0359AD0275A8B6F5,
+ 0x41A94CE9DC428066, 0xCF8B0890283E370C, 0x8D7BE97B81D4019F,
+ 0x4A6ACB477BEA5A2A, 0x089A2AACD2006CB9, 0x14DEA25F3AF9026D,
+ 0x562E43B4931334FE, 0x913F6188692D6F4B, 0xD3CF8063C0C759D8,
+ 0x5DEDC41A34BBEEB2, 0x1F1D25F19D51D821, 0xD80C07CD676F8394,
+ 0x9AFCE626CE85B507
+};
+
+uint64_t crc64_update(uint64_t crc, const void *_data, size_t len)
+{
+ const unsigned char *data = _data;
+
+ while (len--) {
+ int i = ((int) (crc >> 56) ^ *data++) & 0xFF;
+ crc = crc_table[i] ^ (crc << 8);
+ }
+
+ return crc;
+}
+EXPORT_SYMBOL(crc64_update);
+
+uint64_t crc64(const void *data, size_t len)
+{
+ uint64_t crc = 0xffffffffffffffff;
+
+ crc = crc64_update(crc, data, len);
+
+ return crc ^ 0xffffffffffffffff;
+}
+EXPORT_SYMBOL(crc64);
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
new file mode 100644
index 0000000..5669937
--- /dev/null
+++ b/drivers/md/bcache/util.h
@@ -0,0 +1,606 @@
+
+#ifndef _BCACHE_UTIL_H
+#define _BCACHE_UTIL_H
+
+#include <linux/closure.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/llist.h>
+#include <linux/ratelimit.h>
+#include <linux/vmalloc.h>
+#include <linux/workqueue.h>
+
+#define PAGE_SECTORS (PAGE_SIZE / 512)
+
+struct closure;
+
+#include <trace/events/bcache.h>
+
+#ifdef CONFIG_BCACHE_EDEBUG
+
+#define atomic_dec_bug(v) BUG_ON(atomic_dec_return(v) < 0)
+#define atomic_inc_bug(v, i) BUG_ON(atomic_inc_return(v) <= i)
+
+#else /* EDEBUG */
+
+#define atomic_dec_bug(v) atomic_dec(v)
+#define atomic_inc_bug(v, i) atomic_inc(v)
+
+#endif
+
+#define BITMASK(name, type, field, offset, size) \
+static inline uint64_t name(const type *k) \
+{ return (k->field >> offset) & ~(((uint64_t) ~0) << size); } \
+ \
+static inline void SET_##name(type *k, uint64_t v) \
+{ \
+ k->field &= ~(~((uint64_t) ~0 << size) << offset); \
+ k->field |= v << offset; \
+}
+
+#define DECLARE_HEAP(type, name) \
+ struct { \
+ size_t size, used; \
+ type *data; \
+ } name
+
+#define init_heap(heap, _size, gfp) \
+({ \
+ size_t _bytes; \
+ (heap)->used = 0; \
+ (heap)->size = (_size); \
+ _bytes = (heap)->size * sizeof(*(heap)->data); \
+ (heap)->data = NULL; \
+ if (_bytes < KMALLOC_MAX_SIZE) \
+ (heap)->data = kmalloc(_bytes, (gfp)); \
+ if ((!(heap)->data) && ((gfp) & GFP_KERNEL)) \
+ (heap)->data = vmalloc(_bytes); \
+ (heap)->data; \
+})
+
+#define free_heap(heap) \
+do { \
+ if (is_vmalloc_addr((heap)->data)) \
+ vfree((heap)->data); \
+ else \
+ kfree((heap)->data); \
+ (heap)->data = NULL; \
+} while (0)
+
+#define heap_swap(h, i, j) swap((h)->data[i], (h)->data[j])
+
+#define heap_sift(h, i, cmp) \
+do { \
+ size_t _r, _j = i; \
+ \
+ for (; _j * 2 + 1 < (h)->used; _j = _r) { \
+ _r = _j * 2 + 1; \
+ if (_r + 1 < (h)->used && \
+ cmp((h)->data[_r], (h)->data[_r + 1])) \
+ _r++; \
+ \
+ if (cmp((h)->data[_r], (h)->data[_j])) \
+ break; \
+ heap_swap(h, _r, _j); \
+ } \
+} while (0)
+
+#define heap_sift_down(h, i, cmp) \
+do { \
+ while (i) { \
+ size_t p = (i - 1) / 2; \
+ if (cmp((h)->data[i], (h)->data[p])) \
+ break; \
+ heap_swap(h, i, p); \
+ i = p; \
+ } \
+} while (0)
+
+#define heap_add(h, d, cmp) \
+({ \
+ bool _r = !heap_full(h); \
+ if (_r) { \
+ size_t _i = (h)->used++; \
+ (h)->data[_i] = d; \
+ \
+ heap_sift_down(h, _i, cmp); \
+ heap_sift(h, _i, cmp); \
+ } \
+ _r; \
+})
+
+#define heap_pop(h, d, cmp) \
+({ \
+ bool _r = (h)->used; \
+ if (_r) { \
+ (d) = (h)->data[0]; \
+ (h)->used--; \
+ heap_swap(h, 0, (h)->used); \
+ heap_sift(h, 0, cmp); \
+ } \
+ _r; \
+})
+
+#define heap_peek(h) ((h)->size ? (h)->data[0] : NULL)
+
+#define heap_full(h) ((h)->used == (h)->size)
+
+#define DECLARE_FIFO(type, name) \
+ struct { \
+ size_t front, back, size, mask; \
+ type *data; \
+ } name
+
+#define fifo_for_each(c, fifo) \
+ for (size_t _i = (fifo)->front; \
+ c = (fifo)->data[_i], _i != (fifo)->back; \
+ _i = (_i + 1) & (fifo)->mask)
+
+#define __init_fifo(fifo, gfp) \
+({ \
+ size_t _allocated_size, _bytes; \
+ BUG_ON(!(fifo)->size); \
+ \
+ _allocated_size = roundup_pow_of_two((fifo)->size + 1); \
+ _bytes = _allocated_size * sizeof(*(fifo)->data); \
+ \
+ (fifo)->mask = _allocated_size - 1; \
+ (fifo)->front = (fifo)->back = 0; \
+ (fifo)->data = NULL; \
+ \
+ if (_bytes < KMALLOC_MAX_SIZE) \
+ (fifo)->data = kmalloc(_bytes, (gfp)); \
+ if ((!(fifo)->data) && ((gfp) & GFP_KERNEL)) \
+ (fifo)->data = vmalloc(_bytes); \
+ (fifo)->data; \
+})
+
+#define init_fifo_exact(fifo, _size, gfp) \
+({ \
+ (fifo)->size = (_size); \
+ __init_fifo(fifo, gfp); \
+})
+
+#define init_fifo(fifo, _size, gfp) \
+({ \
+ (fifo)->size = (_size); \
+ if ((fifo)->size > 4) \
+ (fifo)->size = roundup_pow_of_two((fifo)->size) - 1; \
+ __init_fifo(fifo, gfp); \
+})
+
+#define free_fifo(fifo) \
+do { \
+ if (is_vmalloc_addr((fifo)->data)) \
+ vfree((fifo)->data); \
+ else \
+ kfree((fifo)->data); \
+ (fifo)->data = NULL; \
+} while (0)
+
+#define fifo_used(fifo) (((fifo)->back - (fifo)->front) & (fifo)->mask)
+#define fifo_free(fifo) ((fifo)->size - fifo_used(fifo))
+
+#define fifo_empty(fifo) (!fifo_used(fifo))
+#define fifo_full(fifo) (!fifo_free(fifo))
+
+#define fifo_front(fifo) ((fifo)->data[(fifo)->front])
+#define fifo_back(fifo) \
+ ((fifo)->data[((fifo)->back - 1) & (fifo)->mask])
+
+#define fifo_idx(fifo, p) (((p) - &fifo_front(fifo)) & (fifo)->mask)
+
+#define fifo_push_back(fifo, i) \
+({ \
+ bool _r = !fifo_full((fifo)); \
+ if (_r) { \
+ (fifo)->data[(fifo)->back++] = (i); \
+ (fifo)->back &= (fifo)->mask; \
+ } \
+ _r; \
+})
+
+#define fifo_pop_front(fifo, i) \
+({ \
+ bool _r = !fifo_empty((fifo)); \
+ if (_r) { \
+ (i) = (fifo)->data[(fifo)->front++]; \
+ (fifo)->front &= (fifo)->mask; \
+ } \
+ _r; \
+})
+
+#define fifo_push_front(fifo, i) \
+({ \
+ bool _r = !fifo_full((fifo)); \
+ if (_r) { \
+ --(fifo)->front; \
+ (fifo)->front &= (fifo)->mask; \
+ (fifo)->data[(fifo)->front] = (i); \
+ } \
+ _r; \
+})
+
+#define fifo_pop_back(fifo, i) \
+({ \
+ bool _r = !fifo_empty((fifo)); \
+ if (_r) { \
+ --(fifo)->back; \
+ (fifo)->back &= (fifo)->mask; \
+ (i) = (fifo)->data[(fifo)->back] \
+ } \
+ _r; \
+})
+
+#define fifo_push(fifo, i) fifo_push_back(fifo, (i))
+#define fifo_pop(fifo, i) fifo_pop_front(fifo, (i))
+
+#define fifo_swap(l, r) \
+do { \
+ swap((l)->front, (r)->front); \
+ swap((l)->back, (r)->back); \
+ swap((l)->size, (r)->size); \
+ swap((l)->mask, (r)->mask); \
+ swap((l)->data, (r)->data); \
+} while (0)
+
+#define fifo_move(dest, src) \
+do { \
+ typeof(*((dest)->data)) _t; \
+ while (!fifo_full(dest) && \
+ fifo_pop(src, _t)) \
+ fifo_push(dest, _t); \
+} while (0)
+
+/*
+ * Simple array based allocator - preallocates a number of elements and you can
+ * never allocate more than that, also has no locking.
+ *
+ * Handy because if you know you only need a fixed number of elements you don't
+ * have to worry about memory allocation failure, and sometimes a mempool isn't
+ * what you want.
+ *
+ * We treat the free elements as entries in a singly linked list, and the
+ * freelist as a stack - allocating and freeing push and pop off the freelist.
+ */
+
+#define DECLARE_ARRAY_ALLOCATOR(type, name, size) \
+ struct { \
+ type *freelist; \
+ type data[size]; \
+ } name
+
+#define array_alloc(array) \
+({ \
+ typeof((array)->freelist) _ret = (array)->freelist; \
+ \
+ if (_ret) \
+ (array)->freelist = *((typeof((array)->freelist) *) _ret);\
+ \
+ _ret; \
+})
+
+#define array_free(array, ptr) \
+do { \
+ typeof((array)->freelist) _ptr = ptr; \
+ \
+ *((typeof((array)->freelist) *) _ptr) = (array)->freelist; \
+ (array)->freelist = _ptr; \
+} while (0)
+
+#define array_allocator_init(array) \
+do { \
+ BUILD_BUG_ON(sizeof((array)->data[0]) < sizeof(void *)); \
+ (array)->freelist = NULL; \
+ \
+ for (typeof((array)->freelist) _i = (array)->data; \
+ _i < (array)->data + ARRAY_SIZE((array)->data); \
+ _i++) \
+ array_free(array, _i); \
+} while (0)
+
+#define array_freelist_empty(array) ((array)->freelist == NULL)
+
+#define ANYSINT_MAX(t) \
+ ((((t) 1 << (sizeof(t) * 8 - 2)) - (t) 1) * (t) 2 + (t) 1)
+
+int strtoint_h(const char *, int *);
+int strtouint_h(const char *, unsigned int *);
+int strtoll_h(const char *, long long *);
+int strtoull_h(const char *, unsigned long long *);
+
+static inline int strtol_h(const char *cp, long *res)
+{
+#if BITS_PER_LONG == 32
+ return strtoint_h(cp, (int *) res);
+#else
+ return strtoll_h(cp, (long long *) res);
+#endif
+}
+
+static inline int strtoul_h(const char *cp, long *res)
+{
+#if BITS_PER_LONG == 32
+ return strtouint_h(cp, (unsigned int *) res);
+#else
+ return strtoull_h(cp, (unsigned long long *) res);
+#endif
+}
+
+#define strtoi_h(cp, res) \
+ (__builtin_types_compatible_p(typeof(*res), int) \
+ ? strtoint_h(cp, (void *) res) \
+ :__builtin_types_compatible_p(typeof(*res), long) \
+ ? strtol_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), long long) \
+ ? strtoll_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), unsigned int) \
+ ? strtouint_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), unsigned long) \
+ ? strtoul_h(cp, (void *) res) \
+ : __builtin_types_compatible_p(typeof(*res), unsigned long long)\
+ ? strtoull_h(cp, (void *) res) : -EINVAL)
+
+#define strtoul_safe(cp, var) \
+({ \
+ unsigned long _v; \
+ int _r = strict_strtoul(cp, 10, &_v); \
+ if (!_r) \
+ var = _v; \
+ _r; \
+})
+
+#define strtoul_safe_clamp(cp, var, min, max) \
+({ \
+ unsigned long _v; \
+ int _r = strict_strtoul(cp, 10, &_v); \
+ if (!_r) \
+ var = clamp_t(typeof(var), _v, min, max); \
+ _r; \
+})
+
+#define snprint(buf, size, var) \
+ snprintf(buf, size, \
+ __builtin_types_compatible_p(typeof(var), int) \
+ ? "%i\n" : \
+ __builtin_types_compatible_p(typeof(var), unsigned) \
+ ? "%u\n" : \
+ __builtin_types_compatible_p(typeof(var), long) \
+ ? "%li\n" : \
+ __builtin_types_compatible_p(typeof(var), unsigned long)\
+ ? "%lu\n" : \
+ __builtin_types_compatible_p(typeof(var), int64_t) \
+ ? "%lli\n" : \
+ __builtin_types_compatible_p(typeof(var), uint64_t) \
+ ? "%llu\n" : \
+ __builtin_types_compatible_p(typeof(var), const char *) \
+ ? "%s\n" : "%i\n", var)
+
+bool is_zero(const char *p, size_t n);
+int parse_uuid(const char *s, char *uuid);
+
+ssize_t snprint_string_list(char *buf, size_t size, const char * const list[],
+ size_t selected);
+
+ssize_t read_string_list(const char *buf, const char * const list[]);
+
+struct time_stats {
+ /*
+ * all fields are in nanoseconds, averages are ewmas stored left shifted
+ * by 8
+ */
+ uint64_t max_duration;
+ uint64_t average_duration;
+ uint64_t average_frequency;
+ uint64_t last;
+};
+
+void time_stats_update(struct time_stats *stats, uint64_t time);
+
+#define NSEC_PER_ns 1L
+#define NSEC_PER_us NSEC_PER_USEC
+#define NSEC_PER_ms NSEC_PER_MSEC
+#define NSEC_PER_sec NSEC_PER_SEC
+
+#define __print_time_stat(stats, name, stat, units) \
+ sysfs_print(name ## _ ## stat ## _ ## units, \
+ div_u64((stats)->stat >> 8, NSEC_PER_ ## units))
+
+#define sysfs_print_time_stats(stats, name, \
+ frequency_units, \
+ duration_units) \
+do { \
+ __print_time_stat(stats, name, \
+ average_frequency, frequency_units); \
+ __print_time_stat(stats, name, \
+ average_duration, duration_units); \
+ __print_time_stat(stats, name, \
+ max_duration, duration_units); \
+ \
+ sysfs_print(name ## _last_ ## frequency_units, (stats)->last \
+ ? div_s64(local_clock() - (stats)->last, \
+ NSEC_PER_ ## frequency_units) \
+ : -1LL); \
+} while (0)
+
+#define sysfs_time_stats_attribute(name, \
+ frequency_units, \
+ duration_units) \
+read_attribute(name ## _average_frequency_ ## frequency_units); \
+read_attribute(name ## _average_duration_ ## duration_units); \
+read_attribute(name ## _max_duration_ ## duration_units); \
+read_attribute(name ## _last_ ## frequency_units)
+
+#define sysfs_time_stats_attribute_list(name, \
+ frequency_units, \
+ duration_units) \
+&sysfs_ ## name ## _average_frequency_ ## frequency_units, \
+&sysfs_ ## name ## _average_duration_ ## duration_units, \
+&sysfs_ ## name ## _max_duration_ ## duration_units, \
+&sysfs_ ## name ## _last_ ## frequency_units,
+
+#define ewma_add(ewma, val, weight, factor) \
+({ \
+ (ewma) *= (weight) - 1; \
+ (ewma) += (val) << factor; \
+ (ewma) /= (weight); \
+ (ewma) >> factor; \
+})
+
+struct ratelimit {
+ uint64_t next;
+ unsigned rate;
+};
+
+static inline void ratelimit_reset(struct ratelimit *d)
+{
+ d->next = local_clock();
+}
+
+unsigned next_delay(struct ratelimit *d, uint64_t done);
+
+#define __DIV_SAFE(n, d, zero) \
+({ \
+ typeof(n) _n = (n); \
+ typeof(d) _d = (d); \
+ _d ? _n / _d : zero; \
+})
+
+#define DIV_SAFE(n, d) __DIV_SAFE(n, d, 0)
+
+#define container_of_or_null(ptr, type, member) \
+({ \
+ typeof(ptr) _ptr = ptr; \
+ _ptr ? container_of(_ptr, type, member) : NULL; \
+})
+
+#define RB_INSERT(root, new, member, cmp) \
+({ \
+ __label__ dup; \
+ struct rb_node **n = &(root)->rb_node, *parent = NULL; \
+ typeof(new) this; \
+ int res, ret = -1; \
+ \
+ while (*n) { \
+ parent = *n; \
+ this = container_of(*n, typeof(*(new)), member); \
+ res = cmp(new, this); \
+ if (!res) \
+ goto dup; \
+ n = res < 0 \
+ ? &(*n)->rb_left \
+ : &(*n)->rb_right; \
+ } \
+ \
+ rb_link_node(&(new)->member, parent, n); \
+ rb_insert_color(&(new)->member, root); \
+ ret = 0; \
+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)
+
+/* Does linear interpolation between powers of two */
+static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
+{
+ unsigned fract = x & ~(~0 << fract_bits);
+
+ x >>= fract_bits;
+ x = 1 << x;
+ x += (x * fract) >> fract_bits;
+
+ return x;
+}
+
+#define bio_end(bio) ((bio)->bi_sector + bio_sectors(bio))
+
+void bio_map(struct bio *bio, void *base);
+
+int bio_alloc_pages(struct bio *bio, gfp_t gfp);
+
+static inline sector_t bdev_sectors(struct block_device *bdev)
+{
+ return bdev->bd_inode->i_size >> 9;
+}
+
+#ifdef CONFIG_BCACHE_LATENCY_DEBUG
+extern unsigned latency_warn_ms;
+
+#define latency_ms(j) jiffies_to_msecs(jiffies - (j))
+
+#define pr_latency(j, fmt, ...) \
+do { \
+ int _ms = latency_ms(j); \
+ if (j && latency_warn_ms && (_ms) > (int) latency_warn_ms) \
+ printk_ratelimited(KERN_DEBUG "bcache: %i ms latency " \
+ "called from %pf for " fmt "\n", _ms, \
+ __builtin_return_address(0), ##__VA_ARGS__); \
+} while (0)
+
+#define set_wait(f) ((f)->wait_time = jiffies)
+
+#else
+#define latency_ms(j) (0)
+#define pr_latency(...) do {} while (0)
+#define set_wait(j) do {} while (0)
+#endif
+
+static inline void closure_bio_submit(struct bio *bio, struct closure *cl)
+{
+ closure_get(cl);
+ generic_make_request(bio);
+}
+
+uint64_t crc64_update(uint64_t, const void *, size_t);
+uint64_t crc64(const void *, size_t);
+
+#endif /* _BCACHE_UTIL_H */
--
1.7.7.3
--
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