lustre/mdt/mdt_xattr.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/mdt/mdt_xattr.c
  32  *
  33  * Lustre Metadata Target (mdt) extended attributes management.
  34  *
  35  * Author: Peter Braam <braam@clusterfs.com>
  36  * Author: Andreas Dilger <adilger@clusterfs.com>
  37  * Author: Phil Schwan <phil@clusterfs.com>
  38  * Author: Huang Hua <huanghua@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_MDS
  42
  43 #include <linux/xattr.h>
  44 #include <obd_class.h>
  45 #include <lustre_nodemap.h>
  46 #include <lustre_acl.h>
  47 #include <lustre_lmv.h>
  48 #include "mdt_internal.h"
  49
  50
  51 /* return EADATA length to the caller. negative value means error */
  52 static int mdt_getxattr_pack_reply(struct mdt_thread_info *info)
  53 {
  54         struct req_capsule *pill = info->mti_pill;
  55         struct ptlrpc_request *req = mdt_info_req(info);
  56         const char *xattr_name;
  57         u64 valid;
  58         static const char user_string[] = "user.";
  59         int size;
  60         int rc = 0;
  61         int rc2;
  62         ENTRY;
  63
  64         valid = info->mti_body->mbo_valid & (OBD_MD_FLXATTR | OBD_MD_FLXATTRLS);
  65
  66         /* Determine how many bytes we need */
  67         if (valid == OBD_MD_FLXATTR) {
  68                 xattr_name = req_capsule_client_get(pill, &RMF_NAME);
  69                 if (!xattr_name)
  70                         RETURN(-EFAULT);
  71
  72                 if (!(exp_connect_flags(req->rq_export) & OBD_CONNECT_XATTR) &&
  73                     !strncmp(xattr_name, user_string, sizeof(user_string) - 1))
  74                         RETURN(-EOPNOTSUPP);
  75
  76                 size = mo_xattr_get(info->mti_env,
  77                                     mdt_object_child(info->mti_object),
  78                                     &LU_BUF_NULL, xattr_name);
  79                 if (size == -ENODATA) {
  80                         /* XXX: Some client code will not handle -ENODATA
  81                          * for XATTR_NAME_LOV (trusted.lov) properly.
  82                          */
  83                         if (strcmp(xattr_name, XATTR_NAME_LOV) == 0)
  84                                 rc = 0;
  85                         else
  86                                 rc = -ENODATA;
  87
  88                         size = 0;
  89                 }
  90         } else if (valid == OBD_MD_FLXATTRLS) {
  91                 xattr_name = "list";
  92                 size = mo_xattr_list(info->mti_env,
  93                                      mdt_object_child(info->mti_object),
  94                                      &LU_BUF_NULL);
  95         } else if (valid == OBD_MD_FLXATTRALL) {
  96                 xattr_name = "all";
  97                 /* N.B. eadatasize = 0 is not valid for FLXATTRALL */
  98                 /* We could calculate accurate sizes, but this would
  99                  * introduce a lot of overhead, let's do it later...
 100                  */
 101                 size = info->mti_body->mbo_eadatasize;
 102                 if (size <= 0 || size > info->mti_mdt->mdt_max_ea_size ||
 103                     size & (sizeof(__u32) - 1)) {
 104                         DEBUG_REQ(D_ERROR, req,
 105                                   "%s: invalid EA size(%d) for FLXATTRALL\n",
 106                                   mdt_obd_name(info->mti_mdt), size);
 107                         RETURN(-EINVAL);
 108                 }
 109                 req_capsule_set_size(pill, &RMF_EAVALS, RCL_SERVER, size);
 110                 req_capsule_set_size(pill, &RMF_EAVALS_LENS, RCL_SERVER, size);
 111         } else {
 112                 CDEBUG(D_INFO, "Valid bits: %#llx\n",
 113                        info->mti_body->mbo_valid);
 114                 RETURN(-EINVAL);
 115         }
 116
 117         if (size < 0) {
 118                 if (size != -EOPNOTSUPP && size != -ENOENT)
 119                         CERROR("%s: error geting EA size for '%s': rc = %d\n",
 120                                mdt_obd_name(info->mti_mdt), xattr_name, size);
 121                 RETURN(size);
 122         }
 123
 124         if (req_capsule_has_field(pill, &RMF_ACL, RCL_SERVER))
 125                 req_capsule_set_size(pill, &RMF_ACL, RCL_SERVER,
 126                                      LUSTRE_POSIX_ACL_MAX_SIZE_OLD);
 127
 128         req_capsule_set_size(pill, &RMF_EADATA, RCL_SERVER,
 129                              info->mti_body->mbo_eadatasize == 0 ? 0 : size);
 130
 131         rc2 = req_capsule_server_pack(pill);
 132         if (rc2 < 0)
 133                 RETURN(rc2);
 134
 135         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_GETXATTR_PACK))
 136                 RETURN(-ENOMEM);
 137
 138         RETURN(rc < 0 ? rc : size);
 139 }
 140
 141 static int mdt_nodemap_map_acl(struct mdt_thread_info *info, void *buf,
 142                                size_t size, const char *name,
 143                                enum nodemap_tree_type tree_type)
 144 {
 145         struct lu_nodemap      *nodemap;
 146         struct obd_export      *exp = info->mti_exp;
 147         int                     rc = size;
 148
 149         ENTRY;
 150
 151         if (strcmp(name, XATTR_NAME_ACL_ACCESS) == 0 ||
 152             strcmp(name, XATTR_NAME_ACL_DEFAULT) == 0) {
 153                 if (size > info->mti_mdt->mdt_max_ea_size ||
 154                      (!exp_connect_large_acl(exp) &&
 155                       size > LUSTRE_POSIX_ACL_MAX_SIZE_OLD))
 156                         GOTO(out, rc = -ERANGE);
 157
 158                 nodemap = nodemap_get_from_exp(exp);
 159                 if (IS_ERR(nodemap))
 160                         GOTO(out, rc = PTR_ERR(nodemap));
 161
 162                 rc = nodemap_map_acl(nodemap, buf, size, tree_type);
 163                 nodemap_putref(nodemap);
 164                 if (rc < 0)
 165                         GOTO(out, rc);
 166         }
 167 out:
 168         RETURN(rc);
 169 }
 170
 171 static int mdt_getxattr_all(struct mdt_thread_info *info,
 172                             struct mdt_body *reqbody, struct mdt_body *repbody,
 173                             struct lu_buf *buf, struct md_object *next)
 174 {
 175         const struct lu_env *env = info->mti_env;
 176         char *v, *b, *eadatahead, *eadatatail;
 177         __u32 *sizes;
 178         int eadatasize, eavallen = 0, eavallens = 0, rc;
 179
 180         ENTRY;
 181
 182         /*
 183          * The format of the pill is the following:
 184          * EADATA:      attr1\0attr2\0...attrn\0
 185          * EAVALS:      val1val2...valn
 186          * EAVALS_LENS: 4,4,...4
 187          */
 188
 189         eadatahead = buf->lb_buf;
 190
 191         /* Fill out EADATA first */
 192         rc = mo_xattr_list(env, next, buf);
 193         if (rc < 0)
 194                 GOTO(out_shrink, rc);
 195
 196         eadatasize = rc;
 197         eadatatail = eadatahead + eadatasize;
 198
 199         v = req_capsule_server_get(info->mti_pill, &RMF_EAVALS);
 200         sizes = req_capsule_server_get(info->mti_pill, &RMF_EAVALS_LENS);
 201
 202         /* Fill out EAVALS and EAVALS_LENS */
 203         for (b = eadatahead; b < eadatatail; b += strlen(b) + 1, v += rc) {
 204                 buf->lb_buf = v;
 205                 buf->lb_len = reqbody->mbo_eadatasize - eavallen;
 206                 rc = mo_xattr_get(env, next, buf, b);
 207                 if (rc < 0)
 208                         GOTO(out_shrink, rc);
 209                 rc = mdt_nodemap_map_acl(info, buf->lb_buf, rc, b,
 210                                          NODEMAP_FS_TO_CLIENT);
 211                 if (rc < 0)
 212                         GOTO(out_shrink, rc);
 213                 sizes[eavallens] = rc;
 214                 eavallens++;
 215                 eavallen += rc;
 216         }
 217
 218 out_shrink:
 219         if (rc < 0) {
 220                 eadatasize = 0;
 221                 eavallens = 0;
 222                 eavallen = 0;
 223         }
 224         repbody->mbo_aclsize = eavallen;
 225         repbody->mbo_max_mdsize = eavallens;
 226
 227         req_capsule_shrink(info->mti_pill, &RMF_EAVALS, eavallen, RCL_SERVER);
 228         req_capsule_shrink(info->mti_pill, &RMF_EAVALS_LENS,
 229                            eavallens * sizeof(__u32), RCL_SERVER);
 230         req_capsule_shrink(info->mti_pill, &RMF_EADATA, eadatasize, RCL_SERVER);
 231
 232         if (rc >= 0)
 233                 RETURN(eadatasize);
 234         return rc;
 235 }
 236
 237 int mdt_getxattr(struct mdt_thread_info *info)
 238 {
 239         struct ptlrpc_request  *req = mdt_info_req(info);
 240         struct mdt_body        *reqbody;
 241         struct mdt_body        *repbody = NULL;
 242         struct md_object       *next;
 243         struct lu_buf          *buf;
 244         int                     easize, rc;
 245         u64                     valid;
 246         ktime_t                 kstart = ktime_get();
 247         ENTRY;
 248
 249         LASSERT(info->mti_object != NULL);
 250         LASSERT(lu_object_assert_exists(&info->mti_object->mot_obj));
 251
 252         CDEBUG(D_INODE, "getxattr "DFID"\n", PFID(&info->mti_body->mbo_fid1));
 253
 254         rc = req_check_sepol(info->mti_pill);
 255         if (rc)
 256                 RETURN(err_serious(rc));
 257
 258         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
 259         if (reqbody == NULL)
 260                 RETURN(err_serious(-EFAULT));
 261
 262         rc = mdt_init_ucred(info, reqbody);
 263         if (rc)
 264                 RETURN(err_serious(rc));
 265
 266         next = mdt_object_child(info->mti_object);
 267         easize = mdt_getxattr_pack_reply(info);
 268         if (easize == -ENODATA)
 269                 GOTO(out, rc = easize);
 270         else if (easize < 0)
 271                 GOTO(out, rc = err_serious(easize));
 272
 273         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 274         LASSERT(repbody != NULL);
 275
 276         /* No need further getxattr. */
 277         if (easize == 0 || reqbody->mbo_eadatasize == 0)
 278                 GOTO(out, rc = easize);
 279
 280         buf = &info->mti_buf;
 281         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_EADATA);
 282         buf->lb_len = easize;
 283
 284         valid = info->mti_body->mbo_valid & (OBD_MD_FLXATTR | OBD_MD_FLXATTRLS);
 285
 286         if (valid == OBD_MD_FLXATTR) {
 287                 const char *xattr_name = req_capsule_client_get(info->mti_pill,
 288                                                                 &RMF_NAME);
 289                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 290                 if (rc < 0)
 291                         GOTO(out, rc);
 292
 293                 rc = mdt_nodemap_map_acl(info, buf->lb_buf, rc, xattr_name,
 294                                          NODEMAP_FS_TO_CLIENT);
 295         } else if (valid == OBD_MD_FLXATTRLS) {
 296                 CDEBUG(D_INODE, "listxattr\n");
 297
 298                 rc = mo_xattr_list(info->mti_env, next, buf);
 299                 if (rc < 0)
 300                         CDEBUG(D_INFO, "listxattr failed: %d\n", rc);
 301         } else if (valid == OBD_MD_FLXATTRALL) {
 302                 rc = mdt_getxattr_all(info, reqbody, repbody,
 303                                       buf, next);
 304         } else
 305                 LBUG();
 306
 307         EXIT;
 308 out:
 309         if (rc >= 0) {
 310                 mdt_counter_incr(req, LPROC_MDT_GETXATTR,
 311                                  ktime_us_delta(ktime_get(), kstart));
 312                 /* LU-11109: Set OBD_MD_FLXATTR on success so that
 313                  * newer clients can distinguish between nonexistent
 314                  * xattrs and zero length values.
 315                  */
 316                 repbody->mbo_valid |= OBD_MD_FLXATTR;
 317                 repbody->mbo_eadatasize = rc;
 318                 rc = 0;
 319         }
 320         mdt_exit_ucred(info);
 321         return rc;
 322 }
 323
 324 /* update dir layout after migration/restripe */
 325 int mdt_dir_layout_update(struct mdt_thread_info *info)
 326 {
 327         const struct lu_env *env = info->mti_env;
 328         struct mdt_device *mdt = info->mti_mdt;
 329         struct lu_ucred *uc = mdt_ucred(info);
 330         struct mdt_reint_record *rr = &info->mti_rr;
 331         struct lmv_user_md *lmu = rr->rr_eadata;
 332         __u32 lum_stripe_count = lmu->lum_stripe_count;
 333         struct md_layout_change *mlc = &info->mti_mlc;
 334         struct lmv_mds_md_v1 *lmv;
 335         struct md_attr *ma = &info->mti_attr;
 336         struct ldlm_enqueue_info *einfo = &info->mti_einfo;
 337         struct mdt_object *pobj = NULL;
 338         struct mdt_object *obj;
 339         struct mdt_lock_handle *lhp = NULL;
 340         struct mdt_lock_handle *lhc;
 341         bool shrink = false;
 342         int rc;
 343
 344         ENTRY;
 345
 346         if (!mdt->mdt_enable_dir_migration)
 347                 RETURN(-EPERM);
 348
 349         /* we want rbac roles to have precedence over any other
 350          * permission or capability checks
 351          */
 352         if (!uc->uc_rbac_dne_ops ||
 353             (!cap_raised(uc->uc_cap, CAP_SYS_ADMIN) &&
 354              uc->uc_gid != mdt->mdt_enable_remote_dir_gid &&
 355              mdt->mdt_enable_remote_dir_gid != -1))
 356                 RETURN(-EPERM);
 357
 358         obj = mdt_object_find(env, mdt, rr->rr_fid1);
 359         if (IS_ERR(obj))
 360                 RETURN(PTR_ERR(obj));
 361
 362         /* get parent from PFID */
 363         rc = mdt_attr_get_pfid(info, obj, &ma->ma_pfid);
 364         if (rc)
 365                 GOTO(put_obj, rc);
 366
 367         pobj = mdt_object_find(env, mdt, &ma->ma_pfid);
 368         if (IS_ERR(pobj))
 369                 GOTO(put_obj, rc = PTR_ERR(pobj));
 370
 371         /*
 372          * lock parent if dir will be shrunk to 1 stripe, because dir will be
 373          * converted to normal directory, as will change dir FID and update
 374          * namespace of parent.
 375          */
 376         lhp = &info->mti_lh[MDT_LH_PARENT];
 377         if (le32_to_cpu(lmu->lum_stripe_count) < 2) {
 378                 rc = mdt_object_lock(info, pobj, lhp, MDS_INODELOCK_UPDATE,
 379                                      LCK_PW);
 380                 if (rc)
 381                         GOTO(put_pobj, rc);
 382         }
 383
 384         /* lock object */
 385         lhc = &info->mti_lh[MDT_LH_CHILD];
 386         rc = mdt_object_stripes_lock(info, pobj, obj, lhc, einfo,
 387                                      MDS_INODELOCK_FULL, LCK_EX);
 388         if (rc)
 389                 GOTO(unlock_pobj, rc);
 390
 391         rc = mdt_stripe_get(info, obj, ma, XATTR_NAME_LMV);
 392         if (rc)
 393                 GOTO(unlock_obj, rc);
 394
 395         /* user may run 'lfs migrate' multiple times, so it's shrunk already */
 396         if (!(ma->ma_valid & MA_LMV))
 397                 GOTO(unlock_obj, rc = -EALREADY);
 398
 399         lmv = &ma->ma_lmv->lmv_md_v1;
 400         if (!lmv_is_sane(lmv))
 401                 GOTO(unlock_obj, rc = -EBADF);
 402
 403         /* ditto */
 404         if (!lmv_is_layout_changing(lmv))
 405                 GOTO(unlock_obj, rc = -EALREADY);
 406
 407         lum_stripe_count = lmu->lum_stripe_count;
 408         if (!lum_stripe_count)
 409                 lum_stripe_count = cpu_to_le32(1);
 410
 411         if (lmv_is_migrating(lmv)) {
 412                 if (lmv->lmv_migrate_offset != lum_stripe_count) {
 413                         CERROR("%s: "DFID" migrate mdt count mismatch %u != %u\n",
 414                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 415                                 lmv->lmv_migrate_offset, lmu->lum_stripe_count);
 416                         GOTO(unlock_obj, rc = -EINVAL);
 417                 }
 418
 419                 /* lum_stripe_offset is not checked, because subdir is migrated
 420                  * to where its parent is located to avoid unnecessary remote
 421                  * directory.
 422                  */
 423
 424                 if (lum_stripe_count > 1 &&
 425                     (lmu->lum_hash_type & cpu_to_le32(LMV_HASH_TYPE_MASK)) &&
 426                     (lmu->lum_hash_type & cpu_to_le32(LMV_HASH_TYPE_MASK)) !=
 427                     (lmv->lmv_hash_type & cpu_to_le32(LMV_HASH_TYPE_MASK))) {
 428                         CERROR("%s: "DFID" migrate mdt hash mismatch %x != %x\n",
 429                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 430                                 lmv->lmv_hash_type, lmu->lum_hash_type);
 431                         GOTO(unlock_obj, rc = -EINVAL);
 432                 }
 433
 434                 shrink = true;
 435         } else if (lmv_is_splitting(lmv)) {
 436                 if (lmv->lmv_stripe_count != lum_stripe_count) {
 437                         CERROR("%s: "DFID" stripe count mismatch %u != %u\n",
 438                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 439                                 lmv->lmv_stripe_count, lmu->lum_stripe_count);
 440                         GOTO(unlock_obj, rc = -EINVAL);
 441                 }
 442
 443                 if (lmu->lum_stripe_offset != LMV_OFFSET_DEFAULT) {
 444                         CERROR("%s: "DFID" dir split offset %u != -1\n",
 445                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 446                                 lmu->lum_stripe_offset);
 447                         GOTO(unlock_obj, rc = -EINVAL);
 448                 }
 449
 450                 if (lmu->lum_hash_type &&
 451                     lmu->lum_hash_type !=
 452                     (lmv->lmv_hash_type & cpu_to_le32(LMV_HASH_TYPE_MASK))) {
 453                         CERROR("%s: "DFID" split hash mismatch %u != %u\n",
 454                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 455                                 lmv->lmv_hash_type, lmu->lum_hash_type);
 456                         GOTO(unlock_obj, rc = -EINVAL);
 457                 }
 458         } else if (lmv_is_merging(lmv)) {
 459                 if (lmv->lmv_merge_offset != lum_stripe_count) {
 460                         CERROR("%s: "DFID" stripe count mismatch %u != %u\n",
 461                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 462                                 lmv->lmv_merge_offset, lmu->lum_stripe_count);
 463                         GOTO(unlock_obj, rc = -EINVAL);
 464                 }
 465
 466                 if (lmu->lum_stripe_offset != LMV_OFFSET_DEFAULT) {
 467                         CERROR("%s: "DFID" dir merge offset %u != -1\n",
 468                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 469                                 lmu->lum_stripe_offset);
 470                         GOTO(unlock_obj, rc = -EINVAL);
 471                 }
 472
 473                 if (lmu->lum_hash_type &&
 474                     (lmu->lum_hash_type & cpu_to_le32(LMV_HASH_TYPE_MASK)) !=
 475                     (lmv->lmv_merge_hash & cpu_to_le32(LMV_HASH_TYPE_MASK))) {
 476                         CERROR("%s: "DFID" merge hash mismatch %u != %u\n",
 477                                 mdt_obd_name(info->mti_mdt), PFID(rr->rr_fid1),
 478                                 lmv->lmv_merge_hash, lmu->lum_hash_type);
 479                         GOTO(unlock_obj, rc = -EINVAL);
 480                 }
 481
 482                 if (lum_stripe_count < lmv->lmv_stripe_count)
 483                         shrink = true;
 484         }
 485
 486         if (shrink) {
 487                 mlc->mlc_opc = MD_LAYOUT_SHRINK;
 488                 mlc->mlc_buf.lb_buf = rr->rr_eadata;
 489                 mlc->mlc_buf.lb_len = rr->rr_eadatalen;
 490                 rc = mo_layout_change(env, mdt_object_child(obj), mlc);
 491         } else {
 492                 struct lu_buf *buf = &info->mti_buf;
 493                 u32 version = le32_to_cpu(lmv->lmv_layout_version);
 494
 495                 lmv->lmv_hash_type &= ~LMV_HASH_FLAG_LAYOUT_CHANGE;
 496                 lmv->lmv_layout_version = cpu_to_le32(++version);
 497                 lmv->lmv_migrate_offset = 0;
 498                 lmv->lmv_migrate_hash = 0;
 499                 buf->lb_buf = lmv;
 500                 buf->lb_len = sizeof(*lmv);
 501                 rc = mo_xattr_set(env, mdt_object_child(obj), buf,
 502                                   XATTR_NAME_LMV, LU_XATTR_REPLACE);
 503         }
 504         GOTO(unlock_obj, rc);
 505
 506 unlock_obj:
 507         mdt_object_stripes_unlock(info, obj, lhc, einfo, rc);
 508 unlock_pobj:
 509         mdt_object_unlock(info, pobj, lhp, rc);
 510 put_pobj:
 511         mdt_object_put(env, pobj);
 512 put_obj:
 513         mdt_object_put(env, obj);
 514
 515         return rc;
 516 }
 517
 518 int mdt_reint_setxattr(struct mdt_thread_info *info,
 519                        struct mdt_lock_handle *unused)
 520 {
 521         struct ptlrpc_request   *req = mdt_info_req(info);
 522         struct mdt_lock_handle  *lh;
 523         const struct lu_env     *env  = info->mti_env;
 524         struct lu_buf           *buf  = &info->mti_buf;
 525         struct mdt_reint_record *rr   = &info->mti_rr;
 526         struct md_attr          *ma = &info->mti_attr;
 527         struct lu_attr          *attr = &info->mti_attr.ma_attr;
 528         struct mdt_object       *obj;
 529         struct md_object        *child;
 530         __u64                    valid = attr->la_valid;
 531         const char              *xattr_name = rr->rr_name.ln_name;
 532         int                      xattr_len = rr->rr_eadatalen;
 533         __u64                    lockpart = MDS_INODELOCK_UPDATE;
 534         ktime_t                  kstart = ktime_get();
 535         int                      rc;
 536         ENTRY;
 537
 538         CDEBUG(D_INODE, "setxattr for "DFID": %s %s\n", PFID(rr->rr_fid1),
 539                valid & OBD_MD_FLXATTR ? "set" : "remove", xattr_name);
 540
 541         if (info->mti_dlm_req)
 542                 ldlm_request_cancel(req, info->mti_dlm_req, 0, LATF_SKIP);
 543
 544         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_SETXATTR))
 545                 RETURN(err_serious(-ENOMEM));
 546
 547         if (strncmp(xattr_name, XATTR_USER_PREFIX,
 548                     sizeof(XATTR_USER_PREFIX) - 1) == 0) {
 549                 if (!(exp_connect_flags(req->rq_export) & OBD_CONNECT_XATTR))
 550                         GOTO(out, rc = -EOPNOTSUPP);
 551         } else if (strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
 552                     sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0) {
 553
 554                 /* setxattr(LMV) with lum is used to shrink dir layout */
 555                 if (strcmp(xattr_name, XATTR_NAME_LMV) == 0) {
 556                         __u32 *magic = rr->rr_eadata;
 557
 558                         /* we don't let to remove LMV? */
 559                         if (!rr->rr_eadata)
 560                                 GOTO(out, rc = 0);
 561
 562                         if (le32_to_cpu(*magic) == LMV_USER_MAGIC ||
 563                             le32_to_cpu(*magic) == LMV_USER_MAGIC_SPECIFIC) {
 564                                 rc = mdt_dir_layout_update(info);
 565                                 GOTO(out, rc);
 566                         }
 567                 }
 568
 569                 if (!cap_raised(mdt_ucred(info)->uc_cap, CAP_SYS_ADMIN))
 570                         GOTO(out, rc = -EPERM);
 571
 572                 if (strcmp(xattr_name, XATTR_NAME_LOV) == 0 ||
 573                     strcmp(xattr_name, XATTR_NAME_LMA) == 0 ||
 574                     strcmp(xattr_name, XATTR_NAME_LMV) == 0 ||
 575                     strcmp(xattr_name, XATTR_NAME_LINK) == 0 ||
 576                     strcmp(xattr_name, XATTR_NAME_FID) == 0 ||
 577                     strcmp(xattr_name, XATTR_NAME_VERSION) == 0 ||
 578                     strcmp(xattr_name, XATTR_NAME_SOM) == 0 ||
 579                     strcmp(xattr_name, XATTR_NAME_HSM) == 0 ||
 580                     strcmp(xattr_name, XATTR_NAME_LFSCK_NAMESPACE) == 0 ||
 581                     (strcmp(xattr_name, XATTR_NAME_DEFAULT_LMV) == 0 &&
 582                      !info->mti_mdt->mdt_enable_dmv_xattr))
 583                         GOTO(out, rc = 0);
 584         } else if ((valid & OBD_MD_FLXATTR) &&
 585                    (strcmp(xattr_name, XATTR_NAME_ACL_ACCESS) == 0 ||
 586                     strcmp(xattr_name, XATTR_NAME_ACL_DEFAULT) == 0)) {
 587                 rc = mdt_nodemap_map_acl(info, rr->rr_eadata, xattr_len,
 588                                          xattr_name, NODEMAP_CLIENT_TO_FS);
 589                 if (rc < 0)
 590                         GOTO(out, rc);
 591                 /* ACLs were mapped out, return an error so the user knows */
 592                 if (rc != xattr_len)
 593                         GOTO(out, rc = -EPERM);
 594         } else if ((strlen(xattr_name) > sizeof(XATTR_LUSTRE_LOV)) &&
 595                    strncmp(xattr_name, XATTR_LUSTRE_LOV,
 596                            strlen(XATTR_LUSTRE_LOV)) == 0) {
 597
 598                 if (!allowed_lustre_lov(xattr_name)) {
 599                         CERROR("%s: invalid xattr name: %s\n",
 600                                mdt_obd_name(info->mti_mdt), xattr_name);
 601                         GOTO(out, rc = -EINVAL);
 602                 }
 603
 604                 lockpart |= MDS_INODELOCK_LAYOUT;
 605         }
 606
 607         if (!strcmp(xattr_name, XATTR_NAME_ACL_ACCESS))
 608                 lockpart |= MDS_INODELOCK_PERM;
 609         /* We need to take the lock on behalf of old clients so that newer
 610          * clients flush their xattr caches
 611          */
 612         else
 613                 lockpart |= MDS_INODELOCK_XATTR;
 614
 615         lh = &info->mti_lh[MDT_LH_PARENT];
 616         /* ACLs were sent to clients under LCK_CR locks, so taking LCK_EX
 617          * to cancel them.
 618          */
 619         obj = mdt_object_find_lock(info, rr->rr_fid1, lh, lockpart, LCK_EX);
 620         if (IS_ERR(obj))
 621                 GOTO(out, rc = PTR_ERR(obj));
 622
 623         tgt_vbr_obj_set(env, mdt_obj2dt(obj));
 624         rc = mdt_version_get_check_save(info, obj, 0);
 625         if (rc)
 626                 GOTO(out_unlock, rc);
 627
 628         if (unlikely(!(valid & OBD_MD_FLCTIME))) {
 629                 /* This isn't strictly an error, but all current clients
 630                  * should set OBD_MD_FLCTIME when setting attributes.
 631                  */
 632                 CWARN("%s: client miss to set OBD_MD_FLCTIME when setxattr %s: [object "DFID"] [valid %llu]\n",
 633                       mdt_obd_name(info->mti_mdt), xattr_name,
 634                       PFID(rr->rr_fid1), valid);
 635                 attr->la_ctime = ktime_get_real_seconds();
 636         }
 637         attr->la_valid = LA_CTIME;
 638         child = mdt_object_child(obj);
 639         if (valid & OBD_MD_FLXATTR) {
 640                 int     flags = 0;
 641
 642                 if (attr->la_flags & XATTR_REPLACE)
 643                         flags |= LU_XATTR_REPLACE;
 644
 645                 if (attr->la_flags & XATTR_CREATE)
 646                         flags |= LU_XATTR_CREATE;
 647
 648                 mdt_fail_write(env, info->mti_mdt->mdt_bottom,
 649                                OBD_FAIL_MDS_SETXATTR_WRITE);
 650
 651                 buf->lb_buf = rr->rr_eadata;
 652                 buf->lb_len = xattr_len;
 653                 rc = mo_xattr_set(env, child, buf, xattr_name, flags);
 654                 /* update ctime after xattr changed */
 655                 if (rc == 0) {
 656                         ma->ma_attr_flags |= MDS_PERM_BYPASS;
 657                         mo_attr_set(env, child, ma);
 658                 }
 659         } else if (valid & OBD_MD_FLXATTRRM) {
 660                 rc = mo_xattr_del(env, child, xattr_name);
 661                 /* update ctime after xattr changed */
 662                 if (rc == 0) {
 663                         ma->ma_attr_flags |= MDS_PERM_BYPASS;
 664                         mo_attr_set(env, child, ma);
 665                 }
 666         } else {
 667                 CDEBUG(D_INFO, "valid bits: %#llx\n", valid);
 668                 rc = -EINVAL;
 669         }
 670
 671         if (rc == 0)
 672                 mdt_counter_incr(req, LPROC_MDT_SETXATTR,
 673                                  ktime_us_delta(ktime_get(), kstart));
 674
 675         EXIT;
 676 out_unlock:
 677         mdt_object_unlock_put(info, obj, lh, rc);
 678 out:
 679         mdt_exit_ucred(info);
 680         return rc;
 681 }