lustre/mds/mds_audit_path.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *
   5  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #ifndef EXPORT_SYMTAB
  24 # define EXPORT_SYMTAB
  25 #endif
  26 #define DEBUG_SUBSYSTEM S_MDS
  27
  28 #include <linux/module.h>
  29 #include <linux/lustre_mds.h>
  30 #include <linux/lustre_dlm.h>
  31 #include <linux/lustre_fsfilt.h>
  32 #include <linux/init.h>
  33 #include <linux/obd_class.h>
  34 #include <linux/fs.h>
  35 #include <linux/namei.h>
  36 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0))
  37 # include <linux/smp_lock.h>
  38 # include <linux/buffer_head.h>
  39 # include <linux/workqueue.h>
  40 # include <linux/mount.h>
  41 #else
  42 # include <linux/locks.h>
  43 #endif
  44 #include <linux/lustre_audit.h>
  45 #include "mds_internal.h"
  46
  47
  48 #define PP_FILE         1
  49 #define PP_DIR          2
  50 #define PP_SPLIT_MASTER 3
  51 #define PP_SPLIT_SLAVE  4
  52 #define PP_CROSS_DIR    5
  53 #define PP_AUDIT_LOG    6       /* search id in audit log */
  54
  55 struct scan_dir_data {
  56         int               rc;
  57         struct lustre_id *id;
  58         char             *name;
  59 };
  60
  61 static int filldir(void *__buf, const char *name, int namlen,
  62                    loff_t offset, ino_t ino, unsigned int d_type)
  63 {
  64         struct scan_dir_data *sd = __buf;
  65         ENTRY;
  66
  67         if (name[0] == '.' &&
  68             (namlen == 1 || (namlen == 2 && name[1] == '.'))) {
  69                 /* skip special entries */
  70                 RETURN(0);
  71         }
  72
  73         LASSERT(sd != NULL);
  74
  75         if (ino == id_ino(sd->id)) {
  76                 strncpy(sd->name, name, namlen);
  77                 sd->rc = 0;
  78                 RETURN(-EINTR); /* break the readdir loop */
  79         }
  80         RETURN(0);
  81 }
  82
  83 int
  84 scan_name_in_parent(struct lustre_id *pid, struct lustre_id *id, char *name)
  85 {
  86         struct file * file;
  87         char *pname;
  88         struct scan_dir_data sd;
  89         int len, rc = 0;
  90         ENTRY;
  91
  92         len = strlen("__iopen__/") + 10 + 1;
  93         OBD_ALLOC(pname, len);
  94         if (!pname)
  95                 RETURN(-ENOMEM);
  96
  97         sprintf(pname, "__iopen__/0x%llx", id_ino(pid));
  98
  99         file = filp_open(pname, O_RDONLY, 0);
 100         if (IS_ERR(file)) {
 101                 CERROR("can't open directory %s: %d\n",
 102                        pname, (int) PTR_ERR(file));
 103                 GOTO(out, rc = PTR_ERR(file));
 104         }
 105
 106         sd.id = id;
 107         sd.name = name;
 108         sd.rc = -ENOENT;
 109         vfs_readdir(file, filldir, &sd);
 110
 111         filp_close(file, 0);
 112         rc = sd.rc;
 113
 114 out:
 115         OBD_FREE(pname, len);
 116         RETURN(rc);
 117
 118 }
 119
 120 /* id2pid - given id, get parent id or master id.
 121  * @obd:   obd device
 122  * @id:    child id to be parsed
 123  * @pid:   parent id or master id
 124  * @type:  id type
 125  */
 126 static int
 127 id2pid(struct obd_device *obd, struct lustre_id *id, struct lustre_id *pid,
 128        __u32 *type)
 129 {
 130         struct dentry *dentry = NULL;
 131         struct inode *inode = NULL;
 132         struct mea *mea = NULL;
 133         int mea_size, rc = 0;
 134         ENTRY;
 135
 136         dentry = mds_id2dentry(obd, id, NULL);
 137         if (IS_ERR(dentry) || !dentry->d_inode) {
 138                 CERROR("can't find inode "LPU64"\n", id_ino(id));
 139                 if (!IS_ERR(dentry)) l_dput(dentry);
 140                 RETURN(-ENOENT);
 141         }
 142         inode = dentry->d_inode;
 143
 144         if (S_ISDIR(id_type(id))) {
 145                 LASSERT(S_ISDIR(inode->i_mode));
 146                 rc = mds_md_get_attr(obd, inode, &mea, &mea_size);
 147                 if (rc)
 148                         GOTO(out, rc);
 149
 150                 if (!mea) {
 151                         *type = PP_DIR;
 152                         goto read_pid;
 153                 } else if (mea && mea->mea_count) {
 154                         *type = PP_SPLIT_MASTER;
 155                         goto read_pid;
 156                 } else {
 157                         *type = PP_SPLIT_SLAVE;
 158                         *pid = mea->mea_ids[mea->mea_master];
 159                 }
 160
 161         } else {
 162                 LASSERT(!S_ISDIR(inode->i_mode));
 163                 *type = PP_FILE;
 164 read_pid:
 165                 rc = mds_read_inode_pid(obd, inode, pid);
 166                 if (rc) {
 167                         CERROR("can't read parent ino(%lu) rc(%d).\n",
 168                                inode->i_ino, rc);
 169                         GOTO(out, rc);
 170                 }
 171         }
 172
 173         /* Well, if it's dir or master split, we have to check if it's
 174          * a cross-ref dir */
 175         if ((*type == PP_DIR || *type == PP_SPLIT_MASTER) &&
 176              id_group(id) != id_group(pid))
 177                 *type = PP_CROSS_DIR;
 178 out:
 179         if (mea)
 180                 OBD_FREE(mea, mea_size);
 181         l_dput(dentry);
 182         RETURN(rc);
 183 }
 184
 185 static int local_parse_id(struct obd_device *obd, struct parseid_pkg *pkg)
 186 {
 187         struct lvfs_run_ctxt saved;
 188         int rc = 0;
 189         ENTRY;
 190
 191         pkg->pp_rc = 0;
 192         pkg->pp_type = 0;
 193         memset(pkg->pp_name, 0, sizeof(pkg->pp_name));
 194
 195         LASSERT(obd->u.mds.mds_num == id_group(&pkg->pp_id1));
 196
 197         /* pp_id2 is present, which indicating we want to scan parent
 198          * dir(pp_id2) to find the cross-ref entry(pp_id1) */
 199         if (id_fid(&pkg->pp_id2)) {
 200                 LASSERT(S_ISDIR(id_type(&pkg->pp_id1)));
 201                 LASSERT(S_ISDIR(id_type(&pkg->pp_id2)));
 202
 203                 pkg->pp_type = PP_DIR;
 204                 goto scan;
 205         }
 206
 207         rc = id2pid(obd, &pkg->pp_id1, &pkg->pp_id2, &pkg->pp_type);
 208         if (rc)
 209                 GOTO(out, rc);
 210 scan:
 211         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 212
 213         switch (pkg->pp_type) {
 214         case PP_FILE:
 215         case PP_DIR:
 216         case PP_SPLIT_MASTER:
 217                 rc = scan_name_in_parent(&pkg->pp_id2, &pkg->pp_id1,
 218                                          pkg->pp_name);
 219                 if (rc)
 220                         CERROR("scan "LPU64" in parent failed. rc=%d\n",
 221                                id_ino(&pkg->pp_id1), rc);
 222                 break;
 223         case PP_SPLIT_SLAVE:
 224         case PP_CROSS_DIR:
 225                 break;
 226         default:
 227                 CERROR("invalid id\n");
 228                 break;
 229         }
 230
 231         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 232 out:
 233         pkg->pp_rc = rc;
 234         RETURN(rc);
 235 }
 236
 237 static int
 238 local_scan_audit_log(struct obd_device *obd, struct parseid_pkg *pkg);
 239
 240 int mds_parse_id(struct ptlrpc_request *req)
 241 {
 242         struct parseid_pkg *pkg, *reppkg;
 243         struct obd_device *obd = req->rq_export->exp_obd;
 244         int rc = 0, size = sizeof(*reppkg);
 245         ENTRY;
 246
 247         pkg = lustre_swab_reqbuf(req, 0, sizeof(*pkg),
 248                                  lustre_swab_parseid_pkg);
 249         if (pkg == NULL)
 250                 RETURN(-EPROTO);
 251
 252         rc = lustre_pack_reply(req, 1, &size, NULL);
 253         if (rc)
 254                 RETURN(rc);
 255
 256         reppkg = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*reppkg));
 257         memcpy(reppkg, pkg, sizeof(*reppkg));
 258
 259         if (reppkg->pp_type == PP_AUDIT_LOG)
 260                 rc = local_scan_audit_log(obd, reppkg);
 261         else
 262                 rc = local_parse_id(obd, reppkg);
 263
 264         if (rc)
 265                 CERROR("local parseid failed. (rc:%d)\n", rc);
 266         RETURN(0);  /* we do need pack reply here */
 267 }
 268
 269 static int parse_id(struct obd_device *obd, struct parseid_pkg *pkg)
 270 {
 271         int rc = 0;
 272         int mds_num = id_group(&pkg->pp_id1);
 273         ENTRY;
 274
 275         LASSERT(mds_num >= 0);
 276
 277         if (mds_num == obd->u.mds.mds_num) {
 278                 rc = local_parse_id(obd, pkg);
 279         } else {
 280                 struct ptlrpc_request *req;
 281                 struct lmv_obd *lmv = &obd->u.mds.mds_md_obd->u.lmv;
 282                 struct parseid_pkg *body;
 283                 int size = sizeof(*body);
 284                 struct obd_export *exp = lmv->tgts[mds_num].ltd_exp;
 285
 286                 req = ptlrpc_prep_req(class_exp2cliimp(exp),
 287                                       LUSTRE_MDS_VERSION, MDS_PARSE_ID, 1,
 288                                       &size, NULL);
 289                 if (!req)
 290                         RETURN(-ENOMEM);
 291
 292                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 293                 memcpy(body, pkg, sizeof(*body));
 294
 295                 req->rq_replen = lustre_msg_size(1, &size);
 296
 297                 rc = ptlrpc_queue_wait(req);
 298                 if (rc)
 299                         GOTO(out, rc);
 300
 301                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
 302                                           lustre_swab_parseid_pkg);
 303                 if (body == NULL) {
 304                         CERROR("can't unpack parseid_pkg\n");
 305                         GOTO(out, rc = -EPROTO);
 306                 }
 307                 memcpy(pkg, body, sizeof(*pkg));
 308 out:
 309                 ptlrpc_req_finished(req);
 310         }
 311         RETURN(rc);
 312 }
 313
 314 struct name_item {
 315         struct list_head link;
 316         char             name[NAME_MAX + 1];
 317 };
 318
 319 int
 320 mds_id2name(struct obd_device *obd, struct lustre_id *id,
 321             struct lustre_id *rootid, struct list_head *list,
 322             struct lustre_id *lastid)
 323 {
 324         struct name_item *item;
 325         struct parseid_pkg *pkg;
 326         int rc = 0;
 327         ENTRY;
 328
 329         OBD_ALLOC(pkg, sizeof(*pkg));
 330         if (pkg == NULL)
 331                 RETURN(-ENOMEM);
 332
 333         pkg->pp_id1 = *id;
 334         while (!id_equal(&pkg->pp_id1, rootid)) {
 335
 336                 rc = parse_id(obd, pkg);
 337                 if (rc) {
 338                         CDEBUG(D_SEC, "parse id failed. rc=%d\n", rc);
 339                         *lastid = pkg->pp_id1;
 340                         break;
 341                 }
 342
 343                 switch (pkg->pp_type) {
 344                 case PP_FILE:
 345                 case PP_DIR:
 346                 case PP_SPLIT_MASTER:
 347                         OBD_ALLOC(item, sizeof(*item));
 348                         if (item == NULL)
 349                                 GOTO(out, rc = -ENOMEM);
 350
 351                         INIT_LIST_HEAD(&item->link);
 352                         list_add(&item->link, list);
 353                         memcpy(item->name, pkg->pp_name, sizeof(item->name));
 354
 355                 case PP_SPLIT_SLAVE:
 356                         pkg->pp_id1 = pkg->pp_id2;
 357                         memset(&pkg->pp_id2, 0, sizeof(struct lustre_id));
 358                         break;
 359                 case PP_CROSS_DIR:
 360                         break;
 361                 default:
 362                         LBUG();
 363                         break;
 364                 }
 365
 366         }
 367 out:
 368         OBD_FREE(pkg, sizeof(*pkg));
 369         RETURN(rc);
 370 }
 371
 372 static int
 373 scan_audit_log_cb(struct llog_handle *llh, struct llog_rec_hdr *rec, void *data)
 374 {
 375         struct parseid_pkg *pkg = (struct parseid_pkg *)data;
 376         struct audit_record *ad_rec;
 377         struct audit_id_record *cid_rec, *pid_rec;
 378         struct audit_name_record *nm_rec;
 379         ENTRY;
 380
 381         if (!(le32_to_cpu(llh->lgh_hdr->llh_flags) & LLOG_F_IS_PLAIN)) {
 382                 CERROR("log is not plain\n");
 383                 RETURN(-EINVAL);
 384         }
 385         if (rec->lrh_type != SMFS_AUDIT_NAME_REC &&
 386             rec->lrh_type != LLOG_GEN_REC) {
 387                 RETURN(0);
 388         }
 389
 390         ad_rec = (struct audit_record *)((char *)rec + sizeof(*rec));
 391
 392         if (ad_rec->result ||
 393             ad_rec->opcode != AUDIT_UNLINK ||
 394             ad_rec->opcode != AUDIT_RENAME)
 395                 RETURN(0);
 396
 397         cid_rec = (struct audit_id_record *)((char *)ad_rec + sizeof(*ad_rec));
 398         pid_rec = cid_rec + 1;
 399         nm_rec = (struct audit_name_record *)
 400                 ((char *)pid_rec + sizeof(*pid_rec));
 401
 402         if (cid_rec->au_num == id_ino(&pkg->pp_id1) &&
 403             cid_rec->au_gen == id_gen(&pkg->pp_id1)) {
 404                 /* get parent id */
 405                 id_ino(&pkg->pp_id2) = pid_rec->au_num;
 406                 id_gen(&pkg->pp_id2) = pid_rec->au_gen;
 407                 id_type(&pkg->pp_id2) = pid_rec->au_type;
 408                 id_fid(&pkg->pp_id2) = pid_rec->au_fid;
 409                 id_group(&pkg->pp_id2) = pid_rec->au_mds;
 410                 /* get name */
 411                 memcpy(pkg->pp_name, nm_rec->name,
 412                        le32_to_cpu(nm_rec->name_len));
 413
 414                 RETURN(LLOG_PROC_BREAK);
 415         }
 416         RETURN(0);
 417 }
 418
 419 static int
 420 local_scan_audit_log(struct obd_device *obd, struct parseid_pkg *pkg)
 421 {
 422         struct llog_handle *llh = NULL;
 423         struct llog_ctxt *ctxt = llog_get_context(&obd->obd_llogs,
 424                                                   LLOG_AUDIT_ORIG_CTXT);
 425         int rc = 0;
 426         ENTRY;
 427
 428         if (ctxt)
 429                 llh = ctxt->loc_handle;
 430
 431         if (llh == NULL)
 432                 RETURN(-ENOENT);
 433
 434         rc = llog_cat_process(llh, (llog_cb_t)&scan_audit_log_cb, (void *)pkg);
 435         if (rc != LLOG_PROC_BREAK) {
 436                 CWARN("process catalog log failed: rc(%d)\n", rc);
 437                 RETURN(-ENOENT);
 438         }
 439         RETURN(0);
 440 }
 441
 442 static int
 443 scan_audit_log(struct obd_device *obd, struct lustre_id *cur_id,
 444                struct list_head *list, struct lustre_id *parent_id)
 445 {
 446         struct name_item *item = NULL;
 447         int rc = 0, mds_num = id_group(cur_id);
 448         struct parseid_pkg *pkg = NULL;
 449         ENTRY;
 450
 451         OBD_ALLOC(pkg, sizeof(*pkg));
 452         if (pkg == NULL)
 453                 RETURN(-ENOMEM);
 454
 455         pkg->pp_type = PP_AUDIT_LOG;
 456         pkg->pp_id1 = *cur_id;
 457
 458         if (obd->u.mds.mds_num == mds_num) {
 459                 rc = local_scan_audit_log(obd, pkg);
 460         } else {
 461                 struct ptlrpc_request *req;
 462                 struct lmv_obd *lmv = &obd->u.mds.mds_md_obd->u.lmv;
 463                 struct parseid_pkg *body;
 464                 int size = sizeof(*body);
 465                 struct obd_export *exp = lmv->tgts[mds_num].ltd_exp;
 466
 467                 req = ptlrpc_prep_req(class_exp2cliimp(exp),
 468                                       LUSTRE_MDS_VERSION, MDS_PARSE_ID, 1,
 469                                       &size, NULL);
 470                 if (!req)
 471                         RETURN(-ENOMEM);
 472
 473                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 474                 memcpy(body, pkg, sizeof(*body));
 475
 476                 req->rq_replen = lustre_msg_size(1, &size);
 477
 478                 rc = ptlrpc_queue_wait(req);
 479                 if (rc)
 480                         GOTO(out_req, rc);
 481
 482                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
 483                                           lustre_swab_parseid_pkg);
 484                 if (body == NULL) {
 485                         CERROR("can't unpack parseid_pkg\n");
 486                         GOTO(out, rc = -EPROTO);
 487                 }
 488                 memcpy(pkg, body, sizeof(*pkg));
 489 out_req:
 490                 ptlrpc_req_finished(req);
 491
 492         }
 493
 494         if (!rc) rc = pkg->pp_rc;
 495         if (rc)
 496                 GOTO(out, rc);
 497
 498         *parent_id = pkg->pp_id2;
 499
 500         OBD_ALLOC(item, sizeof(*item));
 501         if (item == NULL)
 502                 GOTO(out, rc = -ENOMEM);
 503
 504         INIT_LIST_HEAD(&item->link);
 505         list_add(&item->link, list);
 506         memcpy(item->name, pkg->pp_name, sizeof(item->name));
 507 out:
 508         OBD_FREE(pkg, sizeof(*pkg));
 509         RETURN(rc);
 510 }
 511
 512 int
 513 mds_audit_id2name(struct obd_device *obd, char **name, int *namelen,
 514                   struct lustre_id *id)
 515 {
 516         int rc = 0;
 517         struct list_head list, *pos, *n;
 518         struct name_item *item;
 519         struct lustre_id parent_id, cur_id, rootid;
 520         ENTRY;
 521
 522         *namelen = 0;
 523         INIT_LIST_HEAD(&list);
 524
 525         if (obd->u.mds.mds_num) {
 526                 int valsize = sizeof(rootid);
 527                 rc = obd_get_info(obd->u.mds.mds_md_exp, strlen("rootid"),
 528                                   "rootid", &valsize, &rootid);
 529                 if (rc) {
 530                         CERROR("cann't get rootid!\n");
 531                         RETURN(rc);
 532                 }
 533         } else {
 534                 rootid = obd->u.mds.mds_rootid;
 535         }
 536
 537         cur_id = *id;
 538         if (id_equal(&cur_id, &rootid))
 539                 RETURN(0);
 540 next:
 541         memset(&parent_id, 0, sizeof(parent_id));
 542
 543         rc = mds_id2name(obd, &cur_id, &rootid, &list, &parent_id);
 544         if (rc == -ENOENT) {
 545                 /* can't reconstruct name from id, turn to audit log */
 546                 LASSERT(id_fid(&parent_id));
 547                 cur_id = parent_id;
 548                 memset(&parent_id, 0, sizeof(parent_id));
 549
 550                 rc = scan_audit_log(obd, &cur_id, &list, &parent_id);
 551                 if (rc) {
 552                         CERROR("scan id in audit log failed. (rc:%d)\n", rc);
 553                         GOTO(out, rc);
 554                 }
 555
 556                 LASSERT(id_fid(&parent_id));
 557                 cur_id = parent_id;
 558                 goto next;
 559
 560         } else if (rc) {
 561                 CERROR("reconstruct name from id failed. (rc:%d)\n", rc);
 562                 GOTO(out, rc);
 563         }
 564
 565         list_for_each_safe (pos, n, &list) {
 566                 item = list_entry(pos, struct name_item, link);
 567                 *namelen += strlen(item->name) + 1;
 568         }
 569         OBD_ALLOC(*name, *namelen);
 570         if (*name == NULL)
 571                 rc = -ENOMEM;
 572 out:
 573         list_for_each_safe (pos, n, &list) {
 574                 item = list_entry(pos, struct name_item, link);
 575                 if (!rc) {
 576                         strcat(*name, "/");
 577                         strcat(*name, item->name);
 578                 }
 579                 list_del_init(&item->link);
 580                 OBD_FREE(item, sizeof(*item));
 581         }
 582         RETURN(rc);
 583 }
 584 EXPORT_SYMBOL(mds_audit_id2name);