1 /* 2 * random utiility code, for bcache but in theory not specific to bcache 3 * 4 * Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com> 5 * Copyright 2012 Google, Inc. 6 */ 7 8 #include <linux/bio.h> 9 #include <linux/blkdev.h> 10 #include <linux/ctype.h> 11 #include <linux/debugfs.h> 12 #include <linux/module.h> 13 #include <linux/seq_file.h> 14 #include <linux/types.h> 15 16 #include "util.h" 17 18 #define simple_strtoint(c, end, base) simple_strtol(c, end, base) 19 #define simple_strtouint(c, end, base) simple_strtoul(c, end, base) 20 21 #define STRTO_H(name, type) \ 22 int bch_ ## name ## _h(const char *cp, type *res) \ 23 { \ 24 int u = 0; \ 25 char *e; \ 26 type i = simple_ ## name(cp, &e, 10); \ 27 \ 28 switch (tolower(*e)) { \ 29 default: \ 30 return -EINVAL; \ 31 case 'y': \ 32 case 'z': \ 33 u++; \ 34 case 'e': \ 35 u++; \ 36 case 'p': \ 37 u++; \ 38 case 't': \ 39 u++; \ 40 case 'g': \ 41 u++; \ 42 case 'm': \ 43 u++; \ 44 case 'k': \ 45 u++; \ 46 if (e++ == cp) \ 47 return -EINVAL; \ 48 case '\n': \ 49 case '\0': \ 50 if (*e == '\n') \ 51 e++; \ 52 } \ 53 \ 54 if (*e) \ 55 return -EINVAL; \ 56 \ 57 while (u--) { \ 58 if ((type) ~0 > 0 && \ 59 (type) ~0 / 1024 <= i) \ 60 return -EINVAL; \ 61 if ((i > 0 && ANYSINT_MAX(type) / 1024 < i) || \ 62 (i < 0 && -ANYSINT_MAX(type) / 1024 > i)) \ 63 return -EINVAL; \ 64 i *= 1024; \ 65 } \ 66 \ 67 *res = i; \ 68 return 0; \ 69 } \ 70 71 STRTO_H(strtoint, int) 72 STRTO_H(strtouint, unsigned int) 73 STRTO_H(strtoll, long long) 74 STRTO_H(strtoull, unsigned long long) 75 76 ssize_t bch_hprint(char *buf, int64_t v) 77 { 78 static const char units[] = "?kMGTPEZY"; 79 char dec[4] = ""; 80 int u, t = 0; 81 82 for (u = 0; v >= 1024 || v <= -1024; u++) { 83 t = v & ~(~0 << 10); 84 v >>= 10; 85 } 86 87 if (!u) 88 return sprintf(buf, "%llu", v); 89 90 if (v < 100 && v > -100) 91 snprintf(dec, sizeof(dec), ".%i", t / 100); 92 93 return sprintf(buf, "%lli%s%c", v, dec, units[u]); 94 } 95 96 ssize_t bch_snprint_string_list(char *buf, size_t size, const char * const list[], 97 size_t selected) 98 { 99 char *out = buf; 100 size_t i; 101 102 for (i = 0; list[i]; i++) 103 out += snprintf(out, buf + size - out, 104 i == selected ? "[%s] " : "%s ", list[i]); 105 106 out[-1] = '\n'; 107 return out - buf; 108 } 109 110 ssize_t bch_read_string_list(const char *buf, const char * const list[]) 111 { 112 size_t i; 113 char *s, *d = kstrndup(buf, PAGE_SIZE - 1, GFP_KERNEL); 114 if (!d) 115 return -ENOMEM; 116 117 s = strim(d); 118 119 for (i = 0; list[i]; i++) 120 if (!strcmp(list[i], s)) 121 break; 122 123 kfree(d); 124 125 if (!list[i]) 126 return -EINVAL; 127 128 return i; 129 } 130 131 bool bch_is_zero(const char *p, size_t n) 132 { 133 size_t i; 134 135 for (i = 0; i < n; i++) 136 if (p[i]) 137 return false; 138 return true; 139 } 140 141 int bch_parse_uuid(const char *s, char *uuid) 142 { 143 size_t i, j, x; 144 memset(uuid, 0, 16); 145 146 for (i = 0, j = 0; 147 i < strspn(s, "-0123456789:ABCDEFabcdef") && j < 32; 148 i++) { 149 x = s[i] | 32; 150 151 switch (x) { 152 case '0'...'9': 153 x -= '0'; 154 break; 155 case 'a'...'f': 156 x -= 'a' - 10; 157 break; 158 default: 159 continue; 160 } 161 162 if (!(j & 1)) 163 x <<= 4; 164 uuid[j++ >> 1] |= x; 165 } 166 return i; 167 } 168 169 void bch_time_stats_update(struct time_stats *stats, uint64_t start_time) 170 { 171 uint64_t now, duration, last; 172 173 spin_lock(&stats->lock); 174 175 now = local_clock(); 176 duration = time_after64(now, start_time) 177 ? now - start_time : 0; 178 last = time_after64(now, stats->last) 179 ? now - stats->last : 0; 180 181 stats->max_duration = max(stats->max_duration, duration); 182 183 if (stats->last) { 184 ewma_add(stats->average_duration, duration, 8, 8); 185 186 if (stats->average_frequency) 187 ewma_add(stats->average_frequency, last, 8, 8); 188 else 189 stats->average_frequency = last << 8; 190 } else { 191 stats->average_duration = duration << 8; 192 } 193 194 stats->last = now ?: 1; 195 196 spin_unlock(&stats->lock); 197 } 198 199 /** 200 * bch_next_delay() - increment @d by the amount of work done, and return how 201 * long to delay until the next time to do some work. 202 * 203 * @d - the struct bch_ratelimit to update 204 * @done - the amount of work done, in arbitrary units 205 * 206 * Returns the amount of time to delay by, in jiffies 207 */ 208 uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done) 209 { 210 uint64_t now = local_clock(); 211 212 d->next += div_u64(done * NSEC_PER_SEC, d->rate); 213 214 if (time_before64(now + NSEC_PER_SEC, d->next)) 215 d->next = now + NSEC_PER_SEC; 216 217 if (time_after64(now - NSEC_PER_SEC * 2, d->next)) 218 d->next = now - NSEC_PER_SEC * 2; 219 220 return time_after64(d->next, now) 221 ? div_u64(d->next - now, NSEC_PER_SEC / HZ) 222 : 0; 223 } 224 225 void bch_bio_map(struct bio *bio, void *base) 226 { 227 size_t size = bio->bi_iter.bi_size; 228 struct bio_vec *bv = bio->bi_io_vec; 229 230 BUG_ON(!bio->bi_iter.bi_size); 231 BUG_ON(bio->bi_vcnt); 232 233 bv->bv_offset = base ? ((unsigned long) base) % PAGE_SIZE : 0; 234 goto start; 235 236 for (; size; bio->bi_vcnt++, bv++) { 237 bv->bv_offset = 0; 238 start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset, 239 size); 240 if (base) { 241 bv->bv_page = is_vmalloc_addr(base) 242 ? vmalloc_to_page(base) 243 : virt_to_page(base); 244 245 base += bv->bv_len; 246 } 247 248 size -= bv->bv_len; 249 } 250 } 251 252 /* 253 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any 254 * use permitted, subject to terms of PostgreSQL license; see.) 255 256 * If we have a 64-bit integer type, then a 64-bit CRC looks just like the 257 * usual sort of implementation. (See Ross Williams' excellent introduction 258 * A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from 259 * ftp://ftp.rocksoft.com/papers/crc_v3.txt or several other net sites.) 260 * If we have no working 64-bit type, then fake it with two 32-bit registers. 261 * 262 * The present implementation is a normal (not "reflected", in Williams' 263 * terms) 64-bit CRC, using initial all-ones register contents and a final 264 * bit inversion. The chosen polynomial is borrowed from the DLT1 spec 265 * (ECMA-182, available from http://www.ecma.ch/ecma1/STAND/ECMA-182.HTM): 266 * 267 * x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 + 268 * x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 + 269 * x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 + 270 * x^7 + x^4 + x + 1 271 */ 272 273 static const uint64_t crc_table[256] = { 274 0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL, 275 0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL, 276 0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL, 277 0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL, 278 0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL, 279 0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL, 280 0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL, 281 0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL, 282 0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL, 283 0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL, 284 0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL, 285 0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL, 286 0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL, 287 0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL, 288 0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL, 289 0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL, 290 0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL, 291 0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL, 292 0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL, 293 0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL, 294 0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL, 295 0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL, 296 0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL, 297 0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL, 298 0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL, 299 0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL, 300 0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL, 301 0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL, 302 0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL, 303 0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL, 304 0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL, 305 0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL, 306 0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL, 307 0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL, 308 0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL, 309 0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL, 310 0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL, 311 0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL, 312 0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL, 313 0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL, 314 0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL, 315 0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL, 316 0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL, 317 0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL, 318 0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL, 319 0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL, 320 0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL, 321 0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL, 322 0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL, 323 0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL, 324 0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL, 325 0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL, 326 0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL, 327 0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL, 328 0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL, 329 0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL, 330 0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL, 331 0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL, 332 0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL, 333 0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL, 334 0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL, 335 0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL, 336 0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL, 337 0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL, 338 0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL, 339 0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL, 340 0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL, 341 0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL, 342 0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL, 343 0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL, 344 0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL, 345 0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL, 346 0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL, 347 0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL, 348 0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL, 349 0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL, 350 0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL, 351 0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL, 352 0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL, 353 0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL, 354 0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL, 355 0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL, 356 0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL, 357 0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL, 358 0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL, 359 0x9AFCE626CE85B507ULL, 360 }; 361 362 uint64_t bch_crc64_update(uint64_t crc, const void *_data, size_t len) 363 { 364 const unsigned char *data = _data; 365 366 while (len--) { 367 int i = ((int) (crc >> 56) ^ *data++) & 0xFF; 368 crc = crc_table[i] ^ (crc << 8); 369 } 370 371 return crc; 372 } 373 374 uint64_t bch_crc64(const void *data, size_t len) 375 { 376 uint64_t crc = 0xffffffffffffffffULL; 377 378 crc = bch_crc64_update(crc, data, len); 379 380 return crc ^ 0xffffffffffffffffULL; 381 } 382