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 = local_clock(); 172 uint64_t duration = time_after64(now, start_time) 173 ? now - start_time : 0; 174 uint64_t last = time_after64(now, stats->last) 175 ? now - stats->last : 0; 176 177 stats->max_duration = max(stats->max_duration, duration); 178 179 if (stats->last) { 180 ewma_add(stats->average_duration, duration, 8, 8); 181 182 if (stats->average_frequency) 183 ewma_add(stats->average_frequency, last, 8, 8); 184 else 185 stats->average_frequency = last << 8; 186 } else { 187 stats->average_duration = duration << 8; 188 } 189 190 stats->last = now ?: 1; 191 } 192 193 unsigned bch_next_delay(struct ratelimit *d, uint64_t done) 194 { 195 uint64_t now = local_clock(); 196 197 d->next += div_u64(done, d->rate); 198 199 return time_after64(d->next, now) 200 ? div_u64(d->next - now, NSEC_PER_SEC / HZ) 201 : 0; 202 } 203 204 void bch_bio_map(struct bio *bio, void *base) 205 { 206 size_t size = bio->bi_size; 207 struct bio_vec *bv = bio->bi_io_vec; 208 209 BUG_ON(!bio->bi_size); 210 BUG_ON(bio->bi_vcnt); 211 212 bv->bv_offset = base ? ((unsigned long) base) % PAGE_SIZE : 0; 213 goto start; 214 215 for (; size; bio->bi_vcnt++, bv++) { 216 bv->bv_offset = 0; 217 start: bv->bv_len = min_t(size_t, PAGE_SIZE - bv->bv_offset, 218 size); 219 if (base) { 220 bv->bv_page = is_vmalloc_addr(base) 221 ? vmalloc_to_page(base) 222 : virt_to_page(base); 223 224 base += bv->bv_len; 225 } 226 227 size -= bv->bv_len; 228 } 229 } 230 231 /* 232 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any 233 * use permitted, subject to terms of PostgreSQL license; see.) 234 235 * If we have a 64-bit integer type, then a 64-bit CRC looks just like the 236 * usual sort of implementation. (See Ross Williams' excellent introduction 237 * A PAINLESS GUIDE TO CRC ERROR DETECTION ALGORITHMS, available from 238 * ftp://ftp.rocksoft.com/papers/crc_v3.txt or several other net sites.) 239 * If we have no working 64-bit type, then fake it with two 32-bit registers. 240 * 241 * The present implementation is a normal (not "reflected", in Williams' 242 * terms) 64-bit CRC, using initial all-ones register contents and a final 243 * bit inversion. The chosen polynomial is borrowed from the DLT1 spec 244 * (ECMA-182, available from http://www.ecma.ch/ecma1/STAND/ECMA-182.HTM): 245 * 246 * x^64 + x^62 + x^57 + x^55 + x^54 + x^53 + x^52 + x^47 + x^46 + x^45 + 247 * x^40 + x^39 + x^38 + x^37 + x^35 + x^33 + x^32 + x^31 + x^29 + x^27 + 248 * x^24 + x^23 + x^22 + x^21 + x^19 + x^17 + x^13 + x^12 + x^10 + x^9 + 249 * x^7 + x^4 + x + 1 250 */ 251 252 static const uint64_t crc_table[256] = { 253 0x0000000000000000ULL, 0x42F0E1EBA9EA3693ULL, 0x85E1C3D753D46D26ULL, 254 0xC711223CFA3E5BB5ULL, 0x493366450E42ECDFULL, 0x0BC387AEA7A8DA4CULL, 255 0xCCD2A5925D9681F9ULL, 0x8E224479F47CB76AULL, 0x9266CC8A1C85D9BEULL, 256 0xD0962D61B56FEF2DULL, 0x17870F5D4F51B498ULL, 0x5577EEB6E6BB820BULL, 257 0xDB55AACF12C73561ULL, 0x99A54B24BB2D03F2ULL, 0x5EB4691841135847ULL, 258 0x1C4488F3E8F96ED4ULL, 0x663D78FF90E185EFULL, 0x24CD9914390BB37CULL, 259 0xE3DCBB28C335E8C9ULL, 0xA12C5AC36ADFDE5AULL, 0x2F0E1EBA9EA36930ULL, 260 0x6DFEFF5137495FA3ULL, 0xAAEFDD6DCD770416ULL, 0xE81F3C86649D3285ULL, 261 0xF45BB4758C645C51ULL, 0xB6AB559E258E6AC2ULL, 0x71BA77A2DFB03177ULL, 262 0x334A9649765A07E4ULL, 0xBD68D2308226B08EULL, 0xFF9833DB2BCC861DULL, 263 0x388911E7D1F2DDA8ULL, 0x7A79F00C7818EB3BULL, 0xCC7AF1FF21C30BDEULL, 264 0x8E8A101488293D4DULL, 0x499B3228721766F8ULL, 0x0B6BD3C3DBFD506BULL, 265 0x854997BA2F81E701ULL, 0xC7B97651866BD192ULL, 0x00A8546D7C558A27ULL, 266 0x4258B586D5BFBCB4ULL, 0x5E1C3D753D46D260ULL, 0x1CECDC9E94ACE4F3ULL, 267 0xDBFDFEA26E92BF46ULL, 0x990D1F49C77889D5ULL, 0x172F5B3033043EBFULL, 268 0x55DFBADB9AEE082CULL, 0x92CE98E760D05399ULL, 0xD03E790CC93A650AULL, 269 0xAA478900B1228E31ULL, 0xE8B768EB18C8B8A2ULL, 0x2FA64AD7E2F6E317ULL, 270 0x6D56AB3C4B1CD584ULL, 0xE374EF45BF6062EEULL, 0xA1840EAE168A547DULL, 271 0x66952C92ECB40FC8ULL, 0x2465CD79455E395BULL, 0x3821458AADA7578FULL, 272 0x7AD1A461044D611CULL, 0xBDC0865DFE733AA9ULL, 0xFF3067B657990C3AULL, 273 0x711223CFA3E5BB50ULL, 0x33E2C2240A0F8DC3ULL, 0xF4F3E018F031D676ULL, 274 0xB60301F359DBE0E5ULL, 0xDA050215EA6C212FULL, 0x98F5E3FE438617BCULL, 275 0x5FE4C1C2B9B84C09ULL, 0x1D14202910527A9AULL, 0x93366450E42ECDF0ULL, 276 0xD1C685BB4DC4FB63ULL, 0x16D7A787B7FAA0D6ULL, 0x5427466C1E109645ULL, 277 0x4863CE9FF6E9F891ULL, 0x0A932F745F03CE02ULL, 0xCD820D48A53D95B7ULL, 278 0x8F72ECA30CD7A324ULL, 0x0150A8DAF8AB144EULL, 0x43A04931514122DDULL, 279 0x84B16B0DAB7F7968ULL, 0xC6418AE602954FFBULL, 0xBC387AEA7A8DA4C0ULL, 280 0xFEC89B01D3679253ULL, 0x39D9B93D2959C9E6ULL, 0x7B2958D680B3FF75ULL, 281 0xF50B1CAF74CF481FULL, 0xB7FBFD44DD257E8CULL, 0x70EADF78271B2539ULL, 282 0x321A3E938EF113AAULL, 0x2E5EB66066087D7EULL, 0x6CAE578BCFE24BEDULL, 283 0xABBF75B735DC1058ULL, 0xE94F945C9C3626CBULL, 0x676DD025684A91A1ULL, 284 0x259D31CEC1A0A732ULL, 0xE28C13F23B9EFC87ULL, 0xA07CF2199274CA14ULL, 285 0x167FF3EACBAF2AF1ULL, 0x548F120162451C62ULL, 0x939E303D987B47D7ULL, 286 0xD16ED1D631917144ULL, 0x5F4C95AFC5EDC62EULL, 0x1DBC74446C07F0BDULL, 287 0xDAAD56789639AB08ULL, 0x985DB7933FD39D9BULL, 0x84193F60D72AF34FULL, 288 0xC6E9DE8B7EC0C5DCULL, 0x01F8FCB784FE9E69ULL, 0x43081D5C2D14A8FAULL, 289 0xCD2A5925D9681F90ULL, 0x8FDAB8CE70822903ULL, 0x48CB9AF28ABC72B6ULL, 290 0x0A3B7B1923564425ULL, 0x70428B155B4EAF1EULL, 0x32B26AFEF2A4998DULL, 291 0xF5A348C2089AC238ULL, 0xB753A929A170F4ABULL, 0x3971ED50550C43C1ULL, 292 0x7B810CBBFCE67552ULL, 0xBC902E8706D82EE7ULL, 0xFE60CF6CAF321874ULL, 293 0xE224479F47CB76A0ULL, 0xA0D4A674EE214033ULL, 0x67C58448141F1B86ULL, 294 0x253565A3BDF52D15ULL, 0xAB1721DA49899A7FULL, 0xE9E7C031E063ACECULL, 295 0x2EF6E20D1A5DF759ULL, 0x6C0603E6B3B7C1CAULL, 0xF6FAE5C07D3274CDULL, 296 0xB40A042BD4D8425EULL, 0x731B26172EE619EBULL, 0x31EBC7FC870C2F78ULL, 297 0xBFC9838573709812ULL, 0xFD39626EDA9AAE81ULL, 0x3A28405220A4F534ULL, 298 0x78D8A1B9894EC3A7ULL, 0x649C294A61B7AD73ULL, 0x266CC8A1C85D9BE0ULL, 299 0xE17DEA9D3263C055ULL, 0xA38D0B769B89F6C6ULL, 0x2DAF4F0F6FF541ACULL, 300 0x6F5FAEE4C61F773FULL, 0xA84E8CD83C212C8AULL, 0xEABE6D3395CB1A19ULL, 301 0x90C79D3FEDD3F122ULL, 0xD2377CD44439C7B1ULL, 0x15265EE8BE079C04ULL, 302 0x57D6BF0317EDAA97ULL, 0xD9F4FB7AE3911DFDULL, 0x9B041A914A7B2B6EULL, 303 0x5C1538ADB04570DBULL, 0x1EE5D94619AF4648ULL, 0x02A151B5F156289CULL, 304 0x4051B05E58BC1E0FULL, 0x87409262A28245BAULL, 0xC5B073890B687329ULL, 305 0x4B9237F0FF14C443ULL, 0x0962D61B56FEF2D0ULL, 0xCE73F427ACC0A965ULL, 306 0x8C8315CC052A9FF6ULL, 0x3A80143F5CF17F13ULL, 0x7870F5D4F51B4980ULL, 307 0xBF61D7E80F251235ULL, 0xFD913603A6CF24A6ULL, 0x73B3727A52B393CCULL, 308 0x31439391FB59A55FULL, 0xF652B1AD0167FEEAULL, 0xB4A25046A88DC879ULL, 309 0xA8E6D8B54074A6ADULL, 0xEA16395EE99E903EULL, 0x2D071B6213A0CB8BULL, 310 0x6FF7FA89BA4AFD18ULL, 0xE1D5BEF04E364A72ULL, 0xA3255F1BE7DC7CE1ULL, 311 0x64347D271DE22754ULL, 0x26C49CCCB40811C7ULL, 0x5CBD6CC0CC10FAFCULL, 312 0x1E4D8D2B65FACC6FULL, 0xD95CAF179FC497DAULL, 0x9BAC4EFC362EA149ULL, 313 0x158E0A85C2521623ULL, 0x577EEB6E6BB820B0ULL, 0x906FC95291867B05ULL, 314 0xD29F28B9386C4D96ULL, 0xCEDBA04AD0952342ULL, 0x8C2B41A1797F15D1ULL, 315 0x4B3A639D83414E64ULL, 0x09CA82762AAB78F7ULL, 0x87E8C60FDED7CF9DULL, 316 0xC51827E4773DF90EULL, 0x020905D88D03A2BBULL, 0x40F9E43324E99428ULL, 317 0x2CFFE7D5975E55E2ULL, 0x6E0F063E3EB46371ULL, 0xA91E2402C48A38C4ULL, 318 0xEBEEC5E96D600E57ULL, 0x65CC8190991CB93DULL, 0x273C607B30F68FAEULL, 319 0xE02D4247CAC8D41BULL, 0xA2DDA3AC6322E288ULL, 0xBE992B5F8BDB8C5CULL, 320 0xFC69CAB42231BACFULL, 0x3B78E888D80FE17AULL, 0x7988096371E5D7E9ULL, 321 0xF7AA4D1A85996083ULL, 0xB55AACF12C735610ULL, 0x724B8ECDD64D0DA5ULL, 322 0x30BB6F267FA73B36ULL, 0x4AC29F2A07BFD00DULL, 0x08327EC1AE55E69EULL, 323 0xCF235CFD546BBD2BULL, 0x8DD3BD16FD818BB8ULL, 0x03F1F96F09FD3CD2ULL, 324 0x41011884A0170A41ULL, 0x86103AB85A2951F4ULL, 0xC4E0DB53F3C36767ULL, 325 0xD8A453A01B3A09B3ULL, 0x9A54B24BB2D03F20ULL, 0x5D45907748EE6495ULL, 326 0x1FB5719CE1045206ULL, 0x919735E51578E56CULL, 0xD367D40EBC92D3FFULL, 327 0x1476F63246AC884AULL, 0x568617D9EF46BED9ULL, 0xE085162AB69D5E3CULL, 328 0xA275F7C11F7768AFULL, 0x6564D5FDE549331AULL, 0x279434164CA30589ULL, 329 0xA9B6706FB8DFB2E3ULL, 0xEB46918411358470ULL, 0x2C57B3B8EB0BDFC5ULL, 330 0x6EA7525342E1E956ULL, 0x72E3DAA0AA188782ULL, 0x30133B4B03F2B111ULL, 331 0xF7021977F9CCEAA4ULL, 0xB5F2F89C5026DC37ULL, 0x3BD0BCE5A45A6B5DULL, 332 0x79205D0E0DB05DCEULL, 0xBE317F32F78E067BULL, 0xFCC19ED95E6430E8ULL, 333 0x86B86ED5267CDBD3ULL, 0xC4488F3E8F96ED40ULL, 0x0359AD0275A8B6F5ULL, 334 0x41A94CE9DC428066ULL, 0xCF8B0890283E370CULL, 0x8D7BE97B81D4019FULL, 335 0x4A6ACB477BEA5A2AULL, 0x089A2AACD2006CB9ULL, 0x14DEA25F3AF9026DULL, 336 0x562E43B4931334FEULL, 0x913F6188692D6F4BULL, 0xD3CF8063C0C759D8ULL, 337 0x5DEDC41A34BBEEB2ULL, 0x1F1D25F19D51D821ULL, 0xD80C07CD676F8394ULL, 338 0x9AFCE626CE85B507ULL, 339 }; 340 341 uint64_t bch_crc64_update(uint64_t crc, const void *_data, size_t len) 342 { 343 const unsigned char *data = _data; 344 345 while (len--) { 346 int i = ((int) (crc >> 56) ^ *data++) & 0xFF; 347 crc = crc_table[i] ^ (crc << 8); 348 } 349 350 return crc; 351 } 352 353 uint64_t bch_crc64(const void *data, size_t len) 354 { 355 uint64_t crc = 0xffffffffffffffffULL; 356 357 crc = bch_crc64_update(crc, data, len); 358 359 return crc ^ 0xffffffffffffffffULL; 360 } 361