builtin-buildid-cache.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * builtin-buildid-cache.c
   4  *
   5  * Builtin buildid-cache command: Manages build-id cache
   6  *
   7  * Copyright (C) 2010, Red Hat Inc.
   8  * Copyright (C) 2010, Arnaldo Carvalho de Melo <acme@redhat.com>
   9  */
  10 #include <sys/types.h>
  11 #include <sys/time.h>
  12 #include <time.h>
  13 #include <dirent.h>
  14 #include <errno.h>
  15 #include <unistd.h>
  16 #include "builtin.h"
  17 #include "namespaces.h"
  18 #include "util/debug.h"
  19 #include "util/header.h"
  20 #include <subcmd/pager.h>
  21 #include <subcmd/parse-options.h>
  22 #include "util/strlist.h"
  23 #include "util/build-id.h"
  24 #include "util/session.h"
  25 #include "util/dso.h"
  26 #include "util/symbol.h"
  27 #include "util/time-utils.h"
  28 #include "util/util.h"
  29 #include "util/probe-file.h"
  30 #include <linux/string.h>
  31 #include <linux/err.h>
  32
  33 static int build_id_cache__kcore_buildid(const char *proc_dir, char *sbuildid)
  34 {
  35         char root_dir[PATH_MAX];
  36         char *p;
  37
  38         strlcpy(root_dir, proc_dir, sizeof(root_dir));
  39
  40         p = strrchr(root_dir, '/');
  41         if (!p)
  42                 return -1;
  43         *p = '\0';
  44         return sysfs__sprintf_build_id(root_dir, sbuildid);
  45 }
  46
  47 static int build_id_cache__kcore_dir(char *dir, size_t sz)
  48 {
  49         return fetch_current_timestamp(dir, sz);
  50 }
  51
  52 static bool same_kallsyms_reloc(const char *from_dir, char *to_dir)
  53 {
  54         char from[PATH_MAX];
  55         char to[PATH_MAX];
  56         const char *name;
  57         u64 addr1 = 0, addr2 = 0;
  58         int i, err = -1;
  59
  60         scnprintf(from, sizeof(from), "%s/kallsyms", from_dir);
  61         scnprintf(to, sizeof(to), "%s/kallsyms", to_dir);
  62
  63         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
  64                 err = kallsyms__get_function_start(from, name, &addr1);
  65                 if (!err)
  66                         break;
  67         }
  68
  69         if (err)
  70                 return false;
  71
  72         if (kallsyms__get_function_start(to, name, &addr2))
  73                 return false;
  74
  75         return addr1 == addr2;
  76 }
  77
  78 static int build_id_cache__kcore_existing(const char *from_dir, char *to_dir,
  79                                           size_t to_dir_sz)
  80 {
  81         char from[PATH_MAX];
  82         char to[PATH_MAX];
  83         char to_subdir[PATH_MAX];
  84         struct dirent *dent;
  85         int ret = -1;
  86         DIR *d;
  87
  88         d = opendir(to_dir);
  89         if (!d)
  90                 return -1;
  91
  92         scnprintf(from, sizeof(from), "%s/modules", from_dir);
  93
  94         while (1) {
  95                 dent = readdir(d);
  96                 if (!dent)
  97                         break;
  98                 if (dent->d_type != DT_DIR)
  99                         continue;
 100                 scnprintf(to, sizeof(to), "%s/%s/modules", to_dir,
 101                           dent->d_name);
 102                 scnprintf(to_subdir, sizeof(to_subdir), "%s/%s",
 103                           to_dir, dent->d_name);
 104                 if (!compare_proc_modules(from, to) &&
 105                     same_kallsyms_reloc(from_dir, to_subdir)) {
 106                         strlcpy(to_dir, to_subdir, to_dir_sz);
 107                         ret = 0;
 108                         break;
 109                 }
 110         }
 111
 112         closedir(d);
 113
 114         return ret;
 115 }
 116
 117 static int build_id_cache__add_kcore(const char *filename, bool force)
 118 {
 119         char dir[32], sbuildid[SBUILD_ID_SIZE];
 120         char from_dir[PATH_MAX], to_dir[PATH_MAX];
 121         char *p;
 122
 123         strlcpy(from_dir, filename, sizeof(from_dir));
 124
 125         p = strrchr(from_dir, '/');
 126         if (!p || strcmp(p + 1, "kcore"))
 127                 return -1;
 128         *p = '\0';
 129
 130         if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0)
 131                 return -1;
 132
 133         scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s",
 134                   buildid_dir, DSO__NAME_KCORE, sbuildid);
 135
 136         if (!force &&
 137             !build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) {
 138                 pr_debug("same kcore found in %s\n", to_dir);
 139                 return 0;
 140         }
 141
 142         if (build_id_cache__kcore_dir(dir, sizeof(dir)))
 143                 return -1;
 144
 145         scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s",
 146                   buildid_dir, DSO__NAME_KCORE, sbuildid, dir);
 147
 148         if (mkdir_p(to_dir, 0755))
 149                 return -1;
 150
 151         if (kcore_copy(from_dir, to_dir)) {
 152                 /* Remove YYYYmmddHHMMSShh directory */
 153                 if (!rmdir(to_dir)) {
 154                         p = strrchr(to_dir, '/');
 155                         if (p)
 156                                 *p = '\0';
 157                         /* Try to remove buildid directory */
 158                         if (!rmdir(to_dir)) {
 159                                 p = strrchr(to_dir, '/');
 160                                 if (p)
 161                                         *p = '\0';
 162                                 /* Try to remove [kernel.kcore] directory */
 163                                 rmdir(to_dir);
 164                         }
 165                 }
 166                 return -1;
 167         }
 168
 169         pr_debug("kcore added to build-id cache directory %s\n", to_dir);
 170
 171         return 0;
 172 }
 173
 174 static int build_id_cache__add_file(const char *filename, struct nsinfo *nsi)
 175 {
 176         char sbuild_id[SBUILD_ID_SIZE];
 177         struct build_id bid;
 178         int err;
 179         struct nscookie nsc;
 180
 181         nsinfo__mountns_enter(nsi, &nsc);
 182         err = filename__read_build_id(filename, &bid);
 183         nsinfo__mountns_exit(&nsc);
 184         if (err < 0) {
 185                 pr_debug("Couldn't read a build-id in %s\n", filename);
 186                 return -1;
 187         }
 188
 189         build_id__sprintf(&bid, sbuild_id);
 190         err = build_id_cache__add_s(sbuild_id, filename, nsi,
 191                                     false, false);
 192         pr_debug("Adding %s %s: %s\n", sbuild_id, filename,
 193                  err ? "FAIL" : "Ok");
 194         return err;
 195 }
 196
 197 static int build_id_cache__remove_file(const char *filename, struct nsinfo *nsi)
 198 {
 199         char sbuild_id[SBUILD_ID_SIZE];
 200         struct build_id bid;
 201         struct nscookie nsc;
 202
 203         int err;
 204
 205         nsinfo__mountns_enter(nsi, &nsc);
 206         err = filename__read_build_id(filename, &bid);
 207         nsinfo__mountns_exit(&nsc);
 208         if (err < 0) {
 209                 pr_debug("Couldn't read a build-id in %s\n", filename);
 210                 return -1;
 211         }
 212
 213         build_id__sprintf(&bid, sbuild_id);
 214         err = build_id_cache__remove_s(sbuild_id);
 215         pr_debug("Removing %s %s: %s\n", sbuild_id, filename,
 216                  err ? "FAIL" : "Ok");
 217
 218         return err;
 219 }
 220
 221 static int build_id_cache__purge_path(const char *pathname, struct nsinfo *nsi)
 222 {
 223         struct strlist *list;
 224         struct str_node *pos;
 225         int err;
 226
 227         err = build_id_cache__list_build_ids(pathname, nsi, &list);
 228         if (err)
 229                 goto out;
 230
 231         strlist__for_each_entry(pos, list) {
 232                 err = build_id_cache__remove_s(pos->s);
 233                 pr_debug("Removing %s %s: %s\n", pos->s, pathname,
 234                          err ? "FAIL" : "Ok");
 235                 if (err)
 236                         break;
 237         }
 238         strlist__delete(list);
 239
 240 out:
 241         pr_debug("Purging %s: %s\n", pathname, err ? "FAIL" : "Ok");
 242
 243         return err;
 244 }
 245
 246 static int build_id_cache__purge_all(void)
 247 {
 248         struct strlist *list;
 249         struct str_node *pos;
 250         int err = 0;
 251         char *buf;
 252
 253         list = build_id_cache__list_all(false);
 254         if (!list) {
 255                 pr_debug("Failed to get buildids: -%d\n", errno);
 256                 return -EINVAL;
 257         }
 258
 259         strlist__for_each_entry(pos, list) {
 260                 buf = build_id_cache__origname(pos->s);
 261                 err = build_id_cache__remove_s(pos->s);
 262                 pr_debug("Removing %s (%s): %s\n", buf, pos->s,
 263                          err ? "FAIL" : "Ok");
 264                 free(buf);
 265                 if (err)
 266                         break;
 267         }
 268         strlist__delete(list);
 269
 270         pr_debug("Purged all: %s\n", err ? "FAIL" : "Ok");
 271         return err;
 272 }
 273
 274 static bool dso__missing_buildid_cache(struct dso *dso, int parm __maybe_unused)
 275 {
 276         char filename[PATH_MAX];
 277         struct build_id bid;
 278
 279         if (dso__build_id_filename(dso, filename, sizeof(filename), false) &&
 280             filename__read_build_id(filename, &bid) == -1) {
 281                 if (errno == ENOENT)
 282                         return false;
 283
 284                 pr_warning("Problems with %s file, consider removing it from the cache\n",
 285                            filename);
 286         } else if (memcmp(dso->bid.data, bid.data, bid.size)) {
 287                 pr_warning("Problems with %s file, consider removing it from the cache\n",
 288                            filename);
 289         }
 290
 291         return true;
 292 }
 293
 294 static int build_id_cache__fprintf_missing(struct perf_session *session, FILE *fp)
 295 {
 296         perf_session__fprintf_dsos_buildid(session, fp, dso__missing_buildid_cache, 0);
 297         return 0;
 298 }
 299
 300 static int build_id_cache__update_file(const char *filename, struct nsinfo *nsi)
 301 {
 302         char sbuild_id[SBUILD_ID_SIZE];
 303         struct build_id bid;
 304         struct nscookie nsc;
 305
 306         int err;
 307
 308         nsinfo__mountns_enter(nsi, &nsc);
 309         err = filename__read_build_id(filename, &bid);
 310         nsinfo__mountns_exit(&nsc);
 311         if (err < 0) {
 312                 pr_debug("Couldn't read a build-id in %s\n", filename);
 313                 return -1;
 314         }
 315         err = 0;
 316
 317         build_id__sprintf(&bid, sbuild_id);
 318         if (build_id_cache__cached(sbuild_id))
 319                 err = build_id_cache__remove_s(sbuild_id);
 320
 321         if (!err)
 322                 err = build_id_cache__add_s(sbuild_id, filename, nsi, false,
 323                                             false);
 324
 325         pr_debug("Updating %s %s: %s\n", sbuild_id, filename,
 326                  err ? "FAIL" : "Ok");
 327
 328         return err;
 329 }
 330
 331 static int build_id_cache__show_all(void)
 332 {
 333         struct strlist *bidlist;
 334         struct str_node *nd;
 335         char *buf;
 336
 337         bidlist = build_id_cache__list_all(true);
 338         if (!bidlist) {
 339                 pr_debug("Failed to get buildids: -%d\n", errno);
 340                 return -1;
 341         }
 342         strlist__for_each_entry(nd, bidlist) {
 343                 buf = build_id_cache__origname(nd->s);
 344                 fprintf(stdout, "%s %s\n", nd->s, buf);
 345                 free(buf);
 346         }
 347         strlist__delete(bidlist);
 348         return 0;
 349 }
 350
 351 int cmd_buildid_cache(int argc, const char **argv)
 352 {
 353         struct strlist *list;
 354         struct str_node *pos;
 355         int ret = 0;
 356         int ns_id = -1;
 357         bool force = false;
 358         bool list_files = false;
 359         bool opts_flag = false;
 360         bool purge_all = false;
 361         char const *add_name_list_str = NULL,
 362                    *remove_name_list_str = NULL,
 363                    *purge_name_list_str = NULL,
 364                    *missing_filename = NULL,
 365                    *update_name_list_str = NULL,
 366                    *kcore_filename = NULL;
 367         char sbuf[STRERR_BUFSIZE];
 368
 369         struct perf_data data = {
 370                 .mode  = PERF_DATA_MODE_READ,
 371         };
 372         struct perf_session *session = NULL;
 373         struct nsinfo *nsi = NULL;
 374
 375         const struct option buildid_cache_options[] = {
 376         OPT_STRING('a', "add", &add_name_list_str,
 377                    "file list", "file(s) to add"),
 378         OPT_STRING('k', "kcore", &kcore_filename,
 379                    "file", "kcore file to add"),
 380         OPT_STRING('r', "remove", &remove_name_list_str, "file list",
 381                     "file(s) to remove"),
 382         OPT_STRING('p', "purge", &purge_name_list_str, "file list",
 383                     "file(s) to remove (remove old caches too)"),
 384         OPT_BOOLEAN('P', "purge-all", &purge_all, "purge all cached files"),
 385         OPT_BOOLEAN('l', "list", &list_files, "list all cached files"),
 386         OPT_STRING('M', "missing", &missing_filename, "file",
 387                    "to find missing build ids in the cache"),
 388         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 389         OPT_STRING('u', "update", &update_name_list_str, "file list",
 390                     "file(s) to update"),
 391         OPT_INCR('v', "verbose", &verbose, "be more verbose"),
 392         OPT_INTEGER(0, "target-ns", &ns_id, "target pid for namespace context"),
 393         OPT_END()
 394         };
 395         const char * const buildid_cache_usage[] = {
 396                 "perf buildid-cache [<options>]",
 397                 NULL
 398         };
 399
 400         argc = parse_options(argc, argv, buildid_cache_options,
 401                              buildid_cache_usage, 0);
 402
 403         opts_flag = add_name_list_str || kcore_filename ||
 404                 remove_name_list_str || purge_name_list_str ||
 405                 missing_filename || update_name_list_str ||
 406                 purge_all;
 407
 408         if (argc || !(list_files || opts_flag))
 409                 usage_with_options(buildid_cache_usage, buildid_cache_options);
 410
 411         /* -l is exclusive. It can not be used with other options. */
 412         if (list_files && opts_flag) {
 413                 usage_with_options_msg(buildid_cache_usage,
 414                         buildid_cache_options, "-l is exclusive.\n");
 415         }
 416
 417         if (ns_id > 0)
 418                 nsi = nsinfo__new(ns_id);
 419
 420         if (missing_filename) {
 421                 data.path  = missing_filename;
 422                 data.force = force;
 423
 424                 session = perf_session__new(&data, false, NULL);
 425                 if (IS_ERR(session))
 426                         return PTR_ERR(session);
 427         }
 428
 429         if (symbol__init(session ? &session->header.env : NULL) < 0)
 430                 goto out;
 431
 432         setup_pager();
 433
 434         if (list_files) {
 435                 ret = build_id_cache__show_all();
 436                 goto out;
 437         }
 438
 439         if (add_name_list_str) {
 440                 list = strlist__new(add_name_list_str, NULL);
 441                 if (list) {
 442                         strlist__for_each_entry(pos, list)
 443                                 if (build_id_cache__add_file(pos->s, nsi)) {
 444                                         if (errno == EEXIST) {
 445                                                 pr_debug("%s already in the cache\n",
 446                                                          pos->s);
 447                                                 continue;
 448                                         }
 449                                         pr_warning("Couldn't add %s: %s\n",
 450                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 451                                 }
 452
 453                         strlist__delete(list);
 454                 }
 455         }
 456
 457         if (remove_name_list_str) {
 458                 list = strlist__new(remove_name_list_str, NULL);
 459                 if (list) {
 460                         strlist__for_each_entry(pos, list)
 461                                 if (build_id_cache__remove_file(pos->s, nsi)) {
 462                                         if (errno == ENOENT) {
 463                                                 pr_debug("%s wasn't in the cache\n",
 464                                                          pos->s);
 465                                                 continue;
 466                                         }
 467                                         pr_warning("Couldn't remove %s: %s\n",
 468                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 469                                 }
 470
 471                         strlist__delete(list);
 472                 }
 473         }
 474
 475         if (purge_name_list_str) {
 476                 list = strlist__new(purge_name_list_str, NULL);
 477                 if (list) {
 478                         strlist__for_each_entry(pos, list)
 479                                 if (build_id_cache__purge_path(pos->s, nsi)) {
 480                                         if (errno == ENOENT) {
 481                                                 pr_debug("%s wasn't in the cache\n",
 482                                                          pos->s);
 483                                                 continue;
 484                                         }
 485                                         pr_warning("Couldn't remove %s: %s\n",
 486                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 487                                 }
 488
 489                         strlist__delete(list);
 490                 }
 491         }
 492
 493         if (purge_all) {
 494                 if (build_id_cache__purge_all()) {
 495                         pr_warning("Couldn't remove some caches. Error: %s.\n",
 496                                 str_error_r(errno, sbuf, sizeof(sbuf)));
 497                 }
 498         }
 499
 500         if (missing_filename)
 501                 ret = build_id_cache__fprintf_missing(session, stdout);
 502
 503         if (update_name_list_str) {
 504                 list = strlist__new(update_name_list_str, NULL);
 505                 if (list) {
 506                         strlist__for_each_entry(pos, list)
 507                                 if (build_id_cache__update_file(pos->s, nsi)) {
 508                                         if (errno == ENOENT) {
 509                                                 pr_debug("%s wasn't in the cache\n",
 510                                                          pos->s);
 511                                                 continue;
 512                                         }
 513                                         pr_warning("Couldn't update %s: %s\n",
 514                                                    pos->s, str_error_r(errno, sbuf, sizeof(sbuf)));
 515                                 }
 516
 517                         strlist__delete(list);
 518                 }
 519         }
 520
 521         if (kcore_filename && build_id_cache__add_kcore(kcore_filename, force))
 522                 pr_warning("Couldn't add %s\n", kcore_filename);
 523
 524 out:
 525         perf_session__delete(session);
 526         nsinfo__zput(nsi);
 527
 528         return ret;
 529 }