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         __u32            i_num;
  58         __u8             cross_ref;
  59         char             *name;
  60 };
  61
  62 static int filldir(void *__buf, const char *name, int namlen,
  63                    loff_t offset, ino_t ino, unsigned int d_type)
  64 {
  65         struct scan_dir_data *sd = __buf;
  66         ENTRY;
  67
  68         if (name[0] == '.' &&
  69             (namlen == 1 || (namlen == 2 && name[1] == '.'))) {
  70                 /* skip special entries */
  71                 RETURN(0);
  72         }
  73
  74         LASSERT(sd != NULL);
  75
  76         /* skip non-cross_ref entries if we need cross-ref */
  77         if (sd->cross_ref && !(d_type & 128))
  78                 RETURN(0);
  79
  80         if (ino == sd->i_num) {
  81                 strncpy(sd->name, name, namlen);
  82                 sd->rc = 0;
  83                 RETURN(-EINTR); /* break the readdir loop */
  84         }
  85         RETURN(0);
  86 }
  87
  88 static int scan_name_in_parent(struct lustre_id *pid, struct lustre_id *id,
  89                                char *name, int cr)
  90 {
  91         struct file * file;
  92         char *pname;
  93         struct scan_dir_data sd;
  94         int len, rc = 0;
  95         ENTRY;
  96
  97         len = strlen("__iopen__/") + 10 + 1;
  98         OBD_ALLOC(pname, len);
  99         if (!pname)
 100                 RETURN(-ENOMEM);
 101
 102         sprintf(pname, "__iopen__/0x%llx", id_ino(pid));
 103
 104         file = filp_open(pname, O_RDONLY, 0);
 105         if (IS_ERR(file)) {
 106                 CERROR("can't open directory %s: %d\n",
 107                        pname, (int) PTR_ERR(file));
 108                 GOTO(out, rc = PTR_ERR(file));
 109         }
 110
 111         sd.i_num = id_ino(id);
 112         sd.name = name;
 113         sd.cross_ref = cr;
 114         sd.rc = -ENOENT;
 115         vfs_readdir(file, filldir, &sd);
 116
 117         filp_close(file, 0);
 118         rc = sd.rc;
 119
 120 out:
 121         OBD_FREE(pname, len);
 122         RETURN(rc);
 123
 124 }
 125
 126 /* id2pid - given id, get parent id or master id.
 127  * @obd:   obd device
 128  * @id:    child id to be parsed
 129  * @pid:   parent id or master id
 130  * @type:  id type
 131  */
 132 static int
 133 id2pid(struct obd_device *obd, struct lustre_id *id, struct lustre_id *pid,
 134        __u32 *type)
 135 {
 136         struct dentry *dentry = NULL;
 137         struct inode *inode = NULL;
 138         struct mea *mea = NULL;
 139         int mea_size, rc = 0;
 140         ENTRY;
 141
 142         dentry = mds_id2dentry(obd, id, NULL);
 143         if (IS_ERR(dentry) || !dentry->d_inode) {
 144                 CERROR("can't find inode "LPU64"\n", id_ino(id));
 145                 if (!IS_ERR(dentry)) l_dput(dentry);
 146                 RETURN(-ENOENT);
 147         }
 148         inode = dentry->d_inode;
 149
 150         if (S_ISDIR(inode->i_mode)) {
 151                 //LASSERT(S_ISDIR(id_type(id)));
 152                 rc = mds_md_get_attr(obd, inode, &mea, &mea_size);
 153                 if (rc)
 154                         GOTO(out, rc);
 155
 156                 if (!mea) {
 157                         *type = PP_DIR;
 158                         goto read_pid;
 159                 } else if (mea && mea->mea_count) {
 160                         *type = PP_SPLIT_MASTER;
 161                         goto read_pid;
 162                 } else {
 163                         *type = PP_SPLIT_SLAVE;
 164                         *pid = mea->mea_ids[mea->mea_master];
 165                 }
 166
 167         } else {
 168                 //LASSERT(!S_ISDIR(id_type(id)));
 169                 *type = PP_FILE;
 170 read_pid:
 171                 rc = mds_read_inode_pid(obd, inode, pid);
 172                 if (rc) {
 173                         CERROR("can't read parent ino(%lu) rc(%d).\n",
 174                                inode->i_ino, rc);
 175                         GOTO(out, rc);
 176                 }
 177         }
 178
 179         /* Well, if it's dir or master split, we have to check if it's
 180          * a cross-ref dir */
 181         if ((*type == PP_DIR || *type == PP_SPLIT_MASTER) &&
 182              id_group(id) != id_group(pid))
 183                 *type = PP_CROSS_DIR;
 184 out:
 185         if (mea)
 186                 OBD_FREE(mea, mea_size);
 187         l_dput(dentry);
 188         RETURN(rc);
 189 }
 190
 191 static int local_parse_id(struct obd_device *obd, struct parseid_pkg *pkg)
 192 {
 193         struct lvfs_run_ctxt saved;
 194         int rc = 0, cross_ref = 0;
 195         ENTRY;
 196
 197         pkg->pp_rc = 0;
 198         pkg->pp_type = 0;
 199         memset(pkg->pp_name, 0, sizeof(pkg->pp_name));
 200
 201         /* pp_id2 is present, which indicating we want to scan parent
 202          * dir(pp_id2) to find the cross-ref entry(pp_id1) */
 203         if (id_fid(&pkg->pp_id2)) {
 204                 LASSERT(obd->u.mds.mds_num == id_group(&pkg->pp_id2));
 205                 pkg->pp_type = PP_DIR;
 206                 cross_ref = 1;
 207         } else {
 208                 LASSERT(obd->u.mds.mds_num == id_group(&pkg->pp_id1));
 209                 rc = id2pid(obd, &pkg->pp_id1, &pkg->pp_id2, &pkg->pp_type);
 210                 if (rc)
 211                         GOTO(out, rc);
 212         }
 213
 214         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 215
 216         switch (pkg->pp_type) {
 217         case PP_FILE:
 218         case PP_DIR:
 219         case PP_SPLIT_MASTER:
 220                 rc = scan_name_in_parent(&pkg->pp_id2, &pkg->pp_id1,
 221                                          pkg->pp_name, cross_ref);
 222                 if (rc)
 223                         CERROR("scan "LPU64" in parent failed. rc=%d\n",
 224                                id_ino(&pkg->pp_id1), rc);
 225                 break;
 226         case PP_SPLIT_SLAVE:
 227         case PP_CROSS_DIR:
 228                 break;
 229         default:
 230                 CERROR("invalid id\n");
 231                 break;
 232         }
 233
 234         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 235 out:
 236         pkg->pp_rc = rc;
 237         RETURN(rc);
 238 }
 239
 240 static int
 241 local_scan_audit_log(struct obd_device *obd, struct parseid_pkg *pkg);
 242
 243 int mds_parse_id(struct ptlrpc_request *req)
 244 {
 245         struct parseid_pkg *pkg, *reppkg;
 246         struct obd_device *obd = req->rq_export->exp_obd;
 247         int rc = 0, size = sizeof(*reppkg);
 248         ENTRY;
 249
 250         pkg = lustre_swab_reqbuf(req, 0, sizeof(*pkg),
 251                                  lustre_swab_parseid_pkg);
 252         if (pkg == NULL)
 253                 RETURN(-EPROTO);
 254
 255         rc = lustre_pack_reply(req, 1, &size, NULL);
 256         if (rc)
 257                 RETURN(rc);
 258
 259         reppkg = lustre_msg_buf(req->rq_repmsg, 0, sizeof(*reppkg));
 260         memcpy(reppkg, pkg, sizeof(*reppkg));
 261
 262         if (reppkg->pp_type == PP_AUDIT_LOG)
 263                 rc = local_scan_audit_log(obd, reppkg);
 264         else
 265                 rc = local_parse_id(obd, reppkg);
 266
 267         if (rc)
 268                 CERROR("local parseid failed. (rc:%d)\n", rc);
 269         RETURN(0);  /* we do need pack reply here */
 270 }
 271
 272 static int parse_id(struct obd_device *obd, struct parseid_pkg *pkg)
 273 {
 274         int rc = 0;
 275         int mds_num = id_group(&pkg->pp_id1);
 276         ENTRY;
 277
 278         LASSERT(mds_num >= 0);
 279
 280         //for cross-ref dir we should send request to parent's MDS
 281         if (pkg->pp_type == PP_CROSS_DIR)
 282                 mds_num = id_group(&pkg->pp_id2);
 283
 284         if (mds_num == obd->u.mds.mds_num) {
 285                 rc = local_parse_id(obd, pkg);
 286         } else {
 287                 struct ptlrpc_request *req;
 288                 struct lmv_obd *lmv = &obd->u.mds.mds_md_obd->u.lmv;
 289                 struct parseid_pkg *body;
 290                 int size = sizeof(*body);
 291                 struct obd_export *exp;
 292
 293                 /* make sure connection established */
 294                 rc = obd_set_info(obd->u.mds.mds_md_exp, strlen("chkconnect"),
 295                                   "chkconnect", 0, NULL);
 296                 if (rc)
 297                         RETURN(rc);
 298
 299                 exp = lmv->tgts[mds_num].ltd_exp;
 300                 LASSERT(exp);
 301
 302                 req = ptlrpc_prep_req(class_exp2cliimp(exp),
 303                                       LUSTRE_MDS_VERSION, MDS_PARSE_ID, 1,
 304                                       &size, NULL);
 305                 if (!req)
 306                         RETURN(-ENOMEM);
 307
 308                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 309                 memcpy(body, pkg, sizeof(*body));
 310
 311                 req->rq_replen = lustre_msg_size(1, &size);
 312
 313                 rc = ptlrpc_queue_wait(req);
 314                 if (rc)
 315                         GOTO(out, rc);
 316
 317                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
 318                                           lustre_swab_parseid_pkg);
 319                 if (body == NULL) {
 320                         CERROR("can't unpack parseid_pkg\n");
 321                         GOTO(out, rc = -EPROTO);
 322                 }
 323                 memcpy(pkg, body, sizeof(*pkg));
 324 out:
 325                 ptlrpc_req_finished(req);
 326         }
 327         RETURN(rc);
 328 }
 329
 330 #define ROOT_FID        2
 331 struct name_item {
 332         struct list_head link;
 333         char             name[NAME_MAX + 1];
 334 };
 335
 336 int
 337 mds_id2name(struct obd_device *obd, struct lustre_id *id,
 338             struct list_head *list, struct lustre_id *lastid)
 339 {
 340         struct name_item *item;
 341         struct parseid_pkg *pkg;
 342         int rc = 0;
 343         ENTRY;
 344
 345         OBD_ALLOC(pkg, sizeof(*pkg));
 346         if (pkg == NULL)
 347                 RETURN(-ENOMEM);
 348
 349         pkg->pp_id1 = *id;
 350         while (id_fid(&pkg->pp_id1) != ROOT_FID) {
 351
 352                 rc = parse_id(obd, pkg);
 353                 if (rc) {
 354                         CDEBUG(D_SEC, "parse id failed. rc=%d\n", rc);
 355                         *lastid = pkg->pp_id1;
 356                         break;
 357                 }
 358
 359                 switch (pkg->pp_type) {
 360                 case PP_FILE:
 361                 case PP_DIR:
 362                 case PP_SPLIT_MASTER:
 363                         OBD_ALLOC(item, sizeof(*item));
 364                         if (item == NULL)
 365                                 GOTO(out, rc = -ENOMEM);
 366
 367                         INIT_LIST_HEAD(&item->link);
 368                         list_add(&item->link, list);
 369                         memcpy(item->name, pkg->pp_name, sizeof(item->name));
 370
 371                 case PP_SPLIT_SLAVE:
 372                         pkg->pp_id1 = pkg->pp_id2;
 373                         memset(&pkg->pp_id2, 0, sizeof(struct lustre_id));
 374                 case PP_CROSS_DIR:
 375                         break;
 376                 default:
 377                         CERROR("Wrong id = %i\n", pkg->pp_type);
 378                         break;
 379                 }
 380
 381         }
 382 out:
 383         OBD_FREE(pkg, sizeof(*pkg));
 384         RETURN(rc);
 385 }
 386
 387 static int
 388 scan_audit_log_cb(struct llog_handle *llh, struct llog_rec_hdr *rec, void *data)
 389 {
 390         struct parseid_pkg *pkg = (struct parseid_pkg *)data;
 391         struct audit_record *ad_rec;
 392         struct audit_id_record *cid_rec, *pid_rec;
 393         struct audit_name_record *nm_rec;
 394         ENTRY;
 395
 396         if (!(le32_to_cpu(llh->lgh_hdr->llh_flags) & LLOG_F_IS_PLAIN)) {
 397                 CERROR("log is not plain\n");
 398                 RETURN(-EINVAL);
 399         }
 400
 401         if (rec->lrh_type != SMFS_AUDIT_NAME_REC)
 402                 RETURN(0);
 403
 404         ad_rec = (struct audit_record *)(rec + 1);
 405
 406         if (ad_rec->result ||
 407             ad_rec->opcode != AUDIT_UNLINK ||
 408             ad_rec->opcode != AUDIT_RENAME)
 409                 RETURN(0);
 410
 411         cid_rec = (struct audit_id_record *)(ad_rec + 1);
 412         pid_rec = cid_rec + 1;
 413         nm_rec = (struct audit_name_record *)(pid_rec + 1);
 414
 415         if (cid_rec->au_num == id_ino(&pkg->pp_id1) &&
 416             cid_rec->au_gen == id_gen(&pkg->pp_id1)) {
 417                 /* get parent id */
 418                 id_ino(&pkg->pp_id2) = pid_rec->au_num;
 419                 id_gen(&pkg->pp_id2) = pid_rec->au_gen;
 420                 id_type(&pkg->pp_id2) = pid_rec->au_type;
 421                 id_fid(&pkg->pp_id2) = pid_rec->au_fid;
 422                 id_group(&pkg->pp_id2) = pid_rec->au_mds;
 423                 /* get name */
 424                 memcpy(pkg->pp_name, nm_rec->name,
 425                        le32_to_cpu(nm_rec->name_len));
 426
 427                 RETURN(LLOG_PROC_BREAK);
 428         }
 429         RETURN(0);
 430 }
 431
 432 static int
 433 local_scan_audit_log(struct obd_device *obd, struct parseid_pkg *pkg)
 434 {
 435         struct llog_handle *llh = NULL;
 436         struct llog_ctxt *ctxt = llog_get_context(&obd->obd_llogs,
 437                                                   LLOG_AUDIT_ORIG_CTXT);
 438         int rc = 0;
 439         ENTRY;
 440
 441         if (ctxt)
 442                 llh = ctxt->loc_handle;
 443
 444         if (llh == NULL)
 445                 RETURN(-ENOENT);
 446
 447         rc = llog_cat_process(llh, (llog_cb_t)&scan_audit_log_cb, (void *)pkg);
 448         if (rc != LLOG_PROC_BREAK) {
 449                 CWARN("process catalog log failed: rc(%d)\n", rc);
 450                 RETURN(-ENOENT);
 451         }
 452         RETURN(0);
 453 }
 454
 455 static int
 456 scan_audit_log(struct obd_device *obd, struct lustre_id *cur_id,
 457                struct list_head *list, struct lustre_id *parent_id)
 458 {
 459         struct name_item *item = NULL;
 460         int rc = 0, mds_num = id_group(cur_id);
 461         struct parseid_pkg *pkg = NULL;
 462         ENTRY;
 463
 464         OBD_ALLOC(pkg, sizeof(*pkg));
 465         if (pkg == NULL)
 466                 RETURN(-ENOMEM);
 467
 468         pkg->pp_type = PP_AUDIT_LOG;
 469         pkg->pp_id1 = *cur_id;
 470
 471         if (obd->u.mds.mds_num == mds_num) {
 472                 rc = local_scan_audit_log(obd, pkg);
 473         } else {
 474                 struct ptlrpc_request *req;
 475                 struct lmv_obd *lmv = &obd->u.mds.mds_md_obd->u.lmv;
 476                 struct parseid_pkg *body;
 477                 int size = sizeof(*body);
 478                 struct obd_export *exp;
 479
 480                 /* make sure connection established */
 481                 rc = obd_set_info(obd->u.mds.mds_md_exp, strlen("chkconnect"),
 482                                   "chkconnect", 0, NULL);
 483                 if (rc)
 484                         RETURN(rc);
 485
 486                 exp = lmv->tgts[mds_num].ltd_exp;
 487                 LASSERT(exp);
 488
 489                 req = ptlrpc_prep_req(class_exp2cliimp(exp),
 490                                       LUSTRE_MDS_VERSION, MDS_PARSE_ID, 1,
 491                                       &size, NULL);
 492                 if (!req)
 493                         RETURN(-ENOMEM);
 494
 495                 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof(*body));
 496                 memcpy(body, pkg, sizeof(*body));
 497
 498                 req->rq_replen = lustre_msg_size(1, &size);
 499
 500                 rc = ptlrpc_queue_wait(req);
 501                 if (rc)
 502                         GOTO(out_req, rc);
 503
 504                 body = lustre_swab_repbuf(req, 0, sizeof(*body),
 505                                           lustre_swab_parseid_pkg);
 506                 if (body == NULL) {
 507                         CERROR("can't unpack parseid_pkg\n");
 508                         GOTO(out, rc = -EPROTO);
 509                 }
 510                 memcpy(pkg, body, sizeof(*pkg));
 511 out_req:
 512                 ptlrpc_req_finished(req);
 513
 514         }
 515
 516         if (!rc) rc = pkg->pp_rc;
 517         if (rc)
 518                 GOTO(out, rc);
 519
 520         *parent_id = pkg->pp_id2;
 521
 522         OBD_ALLOC(item, sizeof(*item));
 523         if (item == NULL)
 524                 GOTO(out, rc = -ENOMEM);
 525
 526         INIT_LIST_HEAD(&item->link);
 527         list_add(&item->link, list);
 528         memcpy(item->name, pkg->pp_name, sizeof(item->name));
 529 out:
 530         OBD_FREE(pkg, sizeof(*pkg));
 531         RETURN(rc);
 532 }
 533
 534 int
 535 mds_audit_id2name(struct obd_device *obd, char **name, int *namelen,
 536                   struct lustre_id *id)
 537 {
 538         int rc = 0;
 539         struct list_head list, *pos, *n;
 540         struct name_item *item;
 541         struct lustre_id parent_id, cur_id;
 542         ENTRY;
 543
 544         *namelen = 0;
 545         INIT_LIST_HEAD(&list);
 546
 547         cur_id = *id;
 548         if (id_fid(&cur_id) == ROOT_FID)
 549                 RETURN(0);
 550 next:
 551         memset(&parent_id, 0, sizeof(parent_id));
 552         rc = mds_id2name(obd, &cur_id, &list, &parent_id);
 553         if (rc == -ENOENT) {
 554                 /* can't reconstruct name from id, turn to audit log */
 555                 LASSERT(id_fid(&parent_id));
 556                 cur_id = parent_id;
 557                 memset(&parent_id, 0, sizeof(parent_id));
 558
 559                 rc = scan_audit_log(obd, &cur_id, &list, &parent_id);
 560                 if (rc) {
 561                         CERROR("scan id in audit log failed. (rc:%d)\n", rc);
 562                         GOTO(out, rc);
 563                 }
 564
 565                 LASSERT(id_fid(&parent_id));
 566                 cur_id = parent_id;
 567                 goto next;
 568
 569         } else if (rc) {
 570                 CERROR("reconstruct name from id failed. (rc:%d)\n", rc);
 571                 GOTO(out, rc);
 572         }
 573
 574         list_for_each_safe (pos, n, &list) {
 575                 item = list_entry(pos, struct name_item, link);
 576                 *namelen += strlen(item->name) + 1;
 577         }
 578
 579         (*namelen)++;     /* for the ending '\0' of string */
 580         OBD_ALLOC(*name, *namelen);
 581         if (*name == NULL)
 582                 rc = -ENOMEM;
 583 out:
 584         list_for_each_safe (pos, n, &list) {
 585                 item = list_entry(pos, struct name_item, link);
 586
 587                 if (!rc) {
 588                         strcat(*name, "/");
 589                         strcat(*name, item->name);
 590                 }
 591                 list_del_init(&item->link);
 592                 OBD_FREE(item, sizeof(*item));
 593                 LASSERT(strlen(*name) < *namelen);
 594         }
 595         RETURN(rc);
 596 }
 597 EXPORT_SYMBOL(mds_audit_id2name);