drivers/staging/lustre/lustre/llite/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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #include <linux/fs.h>
  38 #include <linux/sched.h>
  39 #include <linux/mm.h>
  40 #include <linux/selinux.h>
  41
  42 #define DEBUG_SUBSYSTEM S_LLITE
  43
  44 #include "../include/obd_support.h"
  45 #include "../include/lustre_lite.h"
  46 #include "../include/lustre_dlm.h"
  47 #include "../include/lustre_ver.h"
  48 #include "../include/lustre_eacl.h"
  49
  50 #include "llite_internal.h"
  51
  52 #define XATTR_USER_T        (1)
  53 #define XATTR_TRUSTED_T  (2)
  54 #define XATTR_SECURITY_T        (3)
  55 #define XATTR_ACL_ACCESS_T      (4)
  56 #define XATTR_ACL_DEFAULT_T     (5)
  57 #define XATTR_LUSTRE_T    (6)
  58 #define XATTR_OTHER_T      (7)
  59
  60 static
  61 int get_xattr_type(const char *name)
  62 {
  63         if (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS))
  64                 return XATTR_ACL_ACCESS_T;
  65
  66         if (!strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT))
  67                 return XATTR_ACL_DEFAULT_T;
  68
  69         if (!strncmp(name, XATTR_USER_PREFIX,
  70                      sizeof(XATTR_USER_PREFIX) - 1))
  71                 return XATTR_USER_T;
  72
  73         if (!strncmp(name, XATTR_TRUSTED_PREFIX,
  74                      sizeof(XATTR_TRUSTED_PREFIX) - 1))
  75                 return XATTR_TRUSTED_T;
  76
  77         if (!strncmp(name, XATTR_SECURITY_PREFIX,
  78                      sizeof(XATTR_SECURITY_PREFIX) - 1))
  79                 return XATTR_SECURITY_T;
  80
  81         if (!strncmp(name, XATTR_LUSTRE_PREFIX,
  82                      sizeof(XATTR_LUSTRE_PREFIX) - 1))
  83                 return XATTR_LUSTRE_T;
  84
  85         return XATTR_OTHER_T;
  86 }
  87
  88 static
  89 int xattr_type_filter(struct ll_sb_info *sbi, int xattr_type)
  90 {
  91         if ((xattr_type == XATTR_ACL_ACCESS_T ||
  92              xattr_type == XATTR_ACL_DEFAULT_T) &&
  93            !(sbi->ll_flags & LL_SBI_ACL))
  94                 return -EOPNOTSUPP;
  95
  96         if (xattr_type == XATTR_USER_T && !(sbi->ll_flags & LL_SBI_USER_XATTR))
  97                 return -EOPNOTSUPP;
  98         if (xattr_type == XATTR_TRUSTED_T && !capable(CFS_CAP_SYS_ADMIN))
  99                 return -EPERM;
 100         if (xattr_type == XATTR_OTHER_T)
 101                 return -EOPNOTSUPP;
 102
 103         return 0;
 104 }
 105
 106 static
 107 int ll_setxattr_common(struct inode *inode, const char *name,
 108                        const void *value, size_t size,
 109                        int flags, __u64 valid)
 110 {
 111         struct ll_sb_info *sbi = ll_i2sbi(inode);
 112         struct ptlrpc_request *req = NULL;
 113         int xattr_type, rc;
 114 #ifdef CONFIG_FS_POSIX_ACL
 115         struct rmtacl_ctl_entry *rce = NULL;
 116         posix_acl_xattr_header *new_value = NULL;
 117         ext_acl_xattr_header *acl = NULL;
 118 #endif
 119         const char *pv = value;
 120
 121         xattr_type = get_xattr_type(name);
 122         rc = xattr_type_filter(sbi, xattr_type);
 123         if (rc)
 124                 return rc;
 125
 126         if ((xattr_type == XATTR_ACL_ACCESS_T ||
 127              xattr_type == XATTR_ACL_DEFAULT_T) &&
 128             !inode_owner_or_capable(inode))
 129                 return -EPERM;
 130
 131         /* b10667: ignore lustre special xattr for now */
 132         if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) ||
 133             (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
 134                 return 0;
 135
 136         /* b15587: ignore security.capability xattr for now */
 137         if ((xattr_type == XATTR_SECURITY_T &&
 138             strcmp(name, "security.capability") == 0))
 139                 return 0;
 140
 141         /* LU-549:  Disable security.selinux when selinux is disabled */
 142         if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
 143             strcmp(name, "security.selinux") == 0)
 144                 return -EOPNOTSUPP;
 145
 146 #ifdef CONFIG_FS_POSIX_ACL
 147         if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
 148             (xattr_type == XATTR_ACL_ACCESS_T ||
 149             xattr_type == XATTR_ACL_DEFAULT_T)) {
 150                 rce = rct_search(&sbi->ll_rct, current_pid());
 151                 if (rce == NULL ||
 152                     (rce->rce_ops != RMT_LSETFACL &&
 153                     rce->rce_ops != RMT_RSETFACL))
 154                         return -EOPNOTSUPP;
 155
 156                 if (rce->rce_ops == RMT_LSETFACL) {
 157                         struct eacl_entry *ee;
 158
 159                         ee = et_search_del(&sbi->ll_et, current_pid(),
 160                                            ll_inode2fid(inode), xattr_type);
 161                         LASSERT(ee != NULL);
 162                         if (valid & OBD_MD_FLXATTR) {
 163                                 acl = lustre_acl_xattr_merge2ext(
 164                                                 (posix_acl_xattr_header *)value,
 165                                                 size, ee->ee_acl);
 166                                 if (IS_ERR(acl)) {
 167                                         ee_free(ee);
 168                                         return PTR_ERR(acl);
 169                                 }
 170                                 size =  CFS_ACL_XATTR_SIZE(\
 171                                                 le32_to_cpu(acl->a_count), \
 172                                                 ext_acl_xattr);
 173                                 pv = (const char *)acl;
 174                         }
 175                         ee_free(ee);
 176                 } else if (rce->rce_ops == RMT_RSETFACL) {
 177                         rc = lustre_posix_acl_xattr_filter(
 178                                                 (posix_acl_xattr_header *)value,
 179                                                 size, &new_value);
 180                         if (unlikely(rc < 0))
 181                                 return rc;
 182                         size = rc;
 183
 184                         pv = (const char *)new_value;
 185                 } else
 186                         return -EOPNOTSUPP;
 187
 188                 valid |= rce_ops2valid(rce->rce_ops);
 189         }
 190 #endif
 191         rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode),
 192                          valid, name, pv, size, 0, flags,
 193                          ll_i2suppgid(inode), &req);
 194 #ifdef CONFIG_FS_POSIX_ACL
 195         if (new_value != NULL)
 196                 lustre_posix_acl_xattr_free(new_value, size);
 197         if (acl != NULL)
 198                 lustre_ext_acl_xattr_free(acl);
 199 #endif
 200         if (rc) {
 201                 if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
 202                         LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
 203                         sbi->ll_flags &= ~LL_SBI_USER_XATTR;
 204                 }
 205                 return rc;
 206         }
 207
 208         ptlrpc_req_finished(req);
 209         return 0;
 210 }
 211
 212 int ll_setxattr(struct dentry *dentry, const char *name,
 213                 const void *value, size_t size, int flags)
 214 {
 215         struct inode *inode = d_inode(dentry);
 216
 217         LASSERT(inode);
 218         LASSERT(name);
 219
 220         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
 221                inode->i_ino, inode->i_generation, inode, name);
 222
 223         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
 224
 225         if ((strncmp(name, XATTR_TRUSTED_PREFIX,
 226                      sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
 227              strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
 228             (strncmp(name, XATTR_LUSTRE_PREFIX,
 229                      sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
 230              strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
 231                 struct lov_user_md *lump = (struct lov_user_md *)value;
 232                 int rc = 0;
 233
 234                 if (size != 0 && size < sizeof(struct lov_user_md))
 235                         return -EINVAL;
 236
 237                 /* Attributes that are saved via getxattr will always have
 238                  * the stripe_offset as 0.  Instead, the MDS should be
 239                  * allowed to pick the starting OST index.   b=17846 */
 240                 if (lump != NULL && lump->lmm_stripe_offset == 0)
 241                         lump->lmm_stripe_offset = -1;
 242
 243                 if (lump != NULL && S_ISREG(inode->i_mode)) {
 244                         int flags = FMODE_WRITE;
 245                         int lum_size = (lump->lmm_magic == LOV_USER_MAGIC_V1) ?
 246                                 sizeof(*lump) : sizeof(struct lov_user_md_v3);
 247
 248                         rc = ll_lov_setstripe_ea_info(inode, dentry, flags, lump,
 249                                                       lum_size);
 250                         /* b10667: rc always be 0 here for now */
 251                         rc = 0;
 252                 } else if (S_ISDIR(inode->i_mode)) {
 253                         rc = ll_dir_setstripe(inode, lump, 0);
 254                 }
 255
 256                 return rc;
 257
 258         } else if (strcmp(name, XATTR_NAME_LMA) == 0 ||
 259                    strcmp(name, XATTR_NAME_LINK) == 0)
 260                 return 0;
 261
 262         return ll_setxattr_common(inode, name, value, size, flags,
 263                                   OBD_MD_FLXATTR);
 264 }
 265
 266 int ll_removexattr(struct dentry *dentry, const char *name)
 267 {
 268         struct inode *inode = d_inode(dentry);
 269
 270         LASSERT(inode);
 271         LASSERT(name);
 272
 273         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
 274                inode->i_ino, inode->i_generation, inode, name);
 275
 276         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
 277         return ll_setxattr_common(inode, name, NULL, 0, 0,
 278                                   OBD_MD_FLXATTRRM);
 279 }
 280
 281 static
 282 int ll_getxattr_common(struct inode *inode, const char *name,
 283                        void *buffer, size_t size, __u64 valid)
 284 {
 285         struct ll_sb_info *sbi = ll_i2sbi(inode);
 286         struct ptlrpc_request *req = NULL;
 287         struct mdt_body *body;
 288         int xattr_type, rc;
 289         void *xdata;
 290         struct rmtacl_ctl_entry *rce = NULL;
 291         struct ll_inode_info *lli = ll_i2info(inode);
 292
 293         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
 294                inode->i_ino, inode->i_generation, inode);
 295
 296         /* listxattr have slightly different behavior from of ext3:
 297          * without 'user_xattr' ext3 will list all xattr names but
 298          * filtered out "^user..*"; we list them all for simplicity.
 299          */
 300         if (!name) {
 301                 xattr_type = XATTR_OTHER_T;
 302                 goto do_getxattr;
 303         }
 304
 305         xattr_type = get_xattr_type(name);
 306         rc = xattr_type_filter(sbi, xattr_type);
 307         if (rc)
 308                 return rc;
 309
 310         /* b15587: ignore security.capability xattr for now */
 311         if ((xattr_type == XATTR_SECURITY_T &&
 312             strcmp(name, "security.capability") == 0))
 313                 return -ENODATA;
 314
 315         /* LU-549:  Disable security.selinux when selinux is disabled */
 316         if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
 317             strcmp(name, "security.selinux") == 0)
 318                 return -EOPNOTSUPP;
 319
 320 #ifdef CONFIG_FS_POSIX_ACL
 321         if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
 322             (xattr_type == XATTR_ACL_ACCESS_T ||
 323             xattr_type == XATTR_ACL_DEFAULT_T)) {
 324                 rce = rct_search(&sbi->ll_rct, current_pid());
 325                 if (rce == NULL ||
 326                     (rce->rce_ops != RMT_LSETFACL &&
 327                     rce->rce_ops != RMT_LGETFACL &&
 328                     rce->rce_ops != RMT_RSETFACL &&
 329                     rce->rce_ops != RMT_RGETFACL))
 330                         return -EOPNOTSUPP;
 331         }
 332
 333         /* posix acl is under protection of LOOKUP lock. when calling to this,
 334          * we just have path resolution to the target inode, so we have great
 335          * chance that cached ACL is uptodate.
 336          */
 337         if (xattr_type == XATTR_ACL_ACCESS_T &&
 338             !(sbi->ll_flags & LL_SBI_RMT_CLIENT)) {
 339
 340                 struct posix_acl *acl;
 341
 342                 spin_lock(&lli->lli_lock);
 343                 acl = posix_acl_dup(lli->lli_posix_acl);
 344                 spin_unlock(&lli->lli_lock);
 345
 346                 if (!acl)
 347                         return -ENODATA;
 348
 349                 rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
 350                 posix_acl_release(acl);
 351                 return rc;
 352         }
 353         if (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
 354                 return -ENODATA;
 355 #endif
 356
 357 do_getxattr:
 358         if (sbi->ll_xattr_cache_enabled && xattr_type != XATTR_ACL_ACCESS_T) {
 359                 rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
 360                 if (rc == -EAGAIN)
 361                         goto getxattr_nocache;
 362                 if (rc < 0)
 363                         goto out_xattr;
 364
 365                 /* Add "system.posix_acl_access" to the list */
 366                 if (lli->lli_posix_acl != NULL && valid & OBD_MD_FLXATTRLS) {
 367                         if (size == 0) {
 368                                 rc += sizeof(XATTR_NAME_ACL_ACCESS);
 369                         } else if (size - rc >= sizeof(XATTR_NAME_ACL_ACCESS)) {
 370                                 memcpy(buffer + rc, XATTR_NAME_ACL_ACCESS,
 371                                        sizeof(XATTR_NAME_ACL_ACCESS));
 372                                 rc += sizeof(XATTR_NAME_ACL_ACCESS);
 373                         } else {
 374                                 rc = -ERANGE;
 375                                 goto out_xattr;
 376                         }
 377                 }
 378         } else {
 379 getxattr_nocache:
 380                 rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode),
 381                                 valid | (rce ? rce_ops2valid(rce->rce_ops) : 0),
 382                                 name, NULL, 0, size, 0, &req);
 383
 384                 if (rc < 0)
 385                         goto out_xattr;
 386
 387                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 388                 LASSERT(body);
 389
 390                 /* only detect the xattr size */
 391                 if (size == 0) {
 392                         rc = body->eadatasize;
 393                         goto out;
 394                 }
 395
 396                 if (size < body->eadatasize) {
 397                         CERROR("server bug: replied size %u > %u\n",
 398                                 body->eadatasize, (int)size);
 399                         rc = -ERANGE;
 400                         goto out;
 401                 }
 402
 403                 if (body->eadatasize == 0) {
 404                         rc = -ENODATA;
 405                         goto out;
 406                 }
 407
 408                 /* do not need swab xattr data */
 409                 xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
 410                                                         body->eadatasize);
 411                 if (!xdata) {
 412                         rc = -EFAULT;
 413                         goto out;
 414                 }
 415
 416                 memcpy(buffer, xdata, body->eadatasize);
 417                 rc = body->eadatasize;
 418         }
 419
 420 #ifdef CONFIG_FS_POSIX_ACL
 421         if (rce && rce->rce_ops == RMT_LSETFACL) {
 422                 ext_acl_xattr_header *acl;
 423
 424                 acl = lustre_posix_acl_xattr_2ext(
 425                                         (posix_acl_xattr_header *)buffer, rc);
 426                 if (IS_ERR(acl)) {
 427                         rc = PTR_ERR(acl);
 428                         goto out;
 429                 }
 430
 431                 rc = ee_add(&sbi->ll_et, current_pid(), ll_inode2fid(inode),
 432                             xattr_type, acl);
 433                 if (unlikely(rc < 0)) {
 434                         lustre_ext_acl_xattr_free(acl);
 435                         goto out;
 436                 }
 437         }
 438 #endif
 439
 440 out_xattr:
 441         if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
 442                 LCONSOLE_INFO(
 443                         "%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
 444                         ll_get_fsname(inode->i_sb, NULL, 0), rc);
 445                 sbi->ll_flags &= ~LL_SBI_USER_XATTR;
 446         }
 447 out:
 448         ptlrpc_req_finished(req);
 449         return rc;
 450 }
 451
 452 ssize_t ll_getxattr(struct dentry *dentry, const char *name,
 453                     void *buffer, size_t size)
 454 {
 455         struct inode *inode = d_inode(dentry);
 456
 457         LASSERT(inode);
 458         LASSERT(name);
 459
 460         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
 461                inode->i_ino, inode->i_generation, inode, name);
 462
 463         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
 464
 465         if ((strncmp(name, XATTR_TRUSTED_PREFIX,
 466                      sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
 467              strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
 468             (strncmp(name, XATTR_LUSTRE_PREFIX,
 469                      sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
 470              strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
 471                 struct lov_stripe_md *lsm;
 472                 struct lov_user_md *lump;
 473                 struct lov_mds_md *lmm = NULL;
 474                 struct ptlrpc_request *request = NULL;
 475                 int rc = 0, lmmsize = 0;
 476
 477                 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
 478                         return -ENODATA;
 479
 480                 if (size == 0 && S_ISDIR(inode->i_mode)) {
 481                         /* XXX directory EA is fix for now, optimize to save
 482                          * RPC transfer */
 483                         rc = sizeof(struct lov_user_md);
 484                         goto out;
 485                 }
 486
 487                 lsm = ccc_inode_lsm_get(inode);
 488                 if (lsm == NULL) {
 489                         if (S_ISDIR(inode->i_mode)) {
 490                                 rc = ll_dir_getstripe(inode, &lmm,
 491                                                       &lmmsize, &request);
 492                         } else {
 493                                 rc = -ENODATA;
 494                         }
 495                 } else {
 496                         /* LSM is present already after lookup/getattr call.
 497                          * we need to grab layout lock once it is implemented */
 498                         rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm);
 499                         lmmsize = rc;
 500                 }
 501                 ccc_inode_lsm_put(inode, lsm);
 502
 503                 if (rc < 0)
 504                         goto out;
 505
 506                 if (size == 0) {
 507                         /* used to call ll_get_max_mdsize() forward to get
 508                          * the maximum buffer size, while some apps (such as
 509                          * rsync 3.0.x) care much about the exact xattr value
 510                          * size */
 511                         rc = lmmsize;
 512                         goto out;
 513                 }
 514
 515                 if (size < lmmsize) {
 516                         CERROR("server bug: replied size %d > %d for %pd (%s)\n",
 517                                lmmsize, (int)size, dentry, name);
 518                         rc = -ERANGE;
 519                         goto out;
 520                 }
 521
 522                 lump = buffer;
 523                 memcpy(lump, lmm, lmmsize);
 524                 /* do not return layout gen for getxattr otherwise it would
 525                  * confuse tar --xattr by recognizing layout gen as stripe
 526                  * offset when the file is restored. See LU-2809. */
 527                 lump->lmm_layout_gen = 0;
 528
 529                 rc = lmmsize;
 530 out:
 531                 if (request)
 532                         ptlrpc_req_finished(request);
 533                 else if (lmm)
 534                         obd_free_diskmd(ll_i2dtexp(inode), &lmm);
 535                 return rc;
 536         }
 537
 538         return ll_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR);
 539 }
 540
 541 ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size)
 542 {
 543         struct inode *inode = d_inode(dentry);
 544         int rc = 0, rc2 = 0;
 545         struct lov_mds_md *lmm = NULL;
 546         struct ptlrpc_request *request = NULL;
 547         int lmmsize;
 548
 549         LASSERT(inode);
 550
 551         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
 552                inode->i_ino, inode->i_generation, inode);
 553
 554         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1);
 555
 556         rc = ll_getxattr_common(inode, NULL, buffer, size, OBD_MD_FLXATTRLS);
 557         if (rc < 0)
 558                 goto out;
 559
 560         if (buffer != NULL) {
 561                 struct ll_sb_info *sbi = ll_i2sbi(inode);
 562                 char *xattr_name = buffer;
 563                 int xlen, rem = rc;
 564
 565                 while (rem > 0) {
 566                         xlen = strnlen(xattr_name, rem - 1) + 1;
 567                         rem -= xlen;
 568                         if (xattr_type_filter(sbi,
 569                                         get_xattr_type(xattr_name)) == 0) {
 570                                 /* skip OK xattr type
 571                                  * leave it in buffer
 572                                  */
 573                                 xattr_name += xlen;
 574                                 continue;
 575                         }
 576                         /* move up remaining xattrs in buffer
 577                          * removing the xattr that is not OK
 578                          */
 579                         memmove(xattr_name, xattr_name + xlen, rem);
 580                         rc -= xlen;
 581                 }
 582         }
 583         if (S_ISREG(inode->i_mode)) {
 584                 if (!ll_i2info(inode)->lli_has_smd)
 585                         rc2 = -1;
 586         } else if (S_ISDIR(inode->i_mode)) {
 587                 rc2 = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
 588         }
 589
 590         if (rc2 < 0) {
 591                 rc2 = 0;
 592                 goto out;
 593         } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {
 594                 const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1;
 595                 const size_t name_len   = sizeof("lov") - 1;
 596                 const size_t total_len  = prefix_len + name_len + 1;
 597
 598                 if (((rc + total_len) > size) && (buffer != NULL)) {
 599                         ptlrpc_req_finished(request);
 600                         return -ERANGE;
 601                 }
 602
 603                 if (buffer != NULL) {
 604                         buffer += rc;
 605                         memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
 606                         memcpy(buffer + prefix_len, "lov", name_len);
 607                         buffer[prefix_len + name_len] = '\0';
 608                 }
 609                 rc2 = total_len;
 610         }
 611 out:
 612         ptlrpc_req_finished(request);
 613         rc = rc + rc2;
 614
 615         return rc;
 616 }