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, POSIX_ACL_XATTR_ACCESS))
  64                 return XATTR_ACL_ACCESS_T;
  65
  66         if (!strcmp(name, POSIX_ACL_XATTR_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         struct obd_capa *oc;
 115 #ifdef CONFIG_FS_POSIX_ACL
 116         struct rmtacl_ctl_entry *rce = NULL;
 117         posix_acl_xattr_header *new_value = NULL;
 118         ext_acl_xattr_header *acl = NULL;
 119 #endif
 120         const char *pv = value;
 121
 122         xattr_type = get_xattr_type(name);
 123         rc = xattr_type_filter(sbi, xattr_type);
 124         if (rc)
 125                 return rc;
 126
 127         if ((xattr_type == XATTR_ACL_ACCESS_T ||
 128              xattr_type == XATTR_ACL_DEFAULT_T) &&
 129             !inode_owner_or_capable(inode))
 130                 return -EPERM;
 131
 132         /* b10667: ignore lustre special xattr for now */
 133         if ((xattr_type == XATTR_TRUSTED_T && strcmp(name, "trusted.lov") == 0) ||
 134             (xattr_type == XATTR_LUSTRE_T && strcmp(name, "lustre.lov") == 0))
 135                 return 0;
 136
 137         /* b15587: ignore security.capability xattr for now */
 138         if ((xattr_type == XATTR_SECURITY_T &&
 139             strcmp(name, "security.capability") == 0))
 140                 return 0;
 141
 142         /* LU-549:  Disable security.selinux when selinux is disabled */
 143         if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
 144             strcmp(name, "security.selinux") == 0)
 145                 return -EOPNOTSUPP;
 146
 147 #ifdef CONFIG_FS_POSIX_ACL
 148         if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
 149             (xattr_type == XATTR_ACL_ACCESS_T ||
 150             xattr_type == XATTR_ACL_DEFAULT_T)) {
 151                 rce = rct_search(&sbi->ll_rct, current_pid());
 152                 if (rce == NULL ||
 153                     (rce->rce_ops != RMT_LSETFACL &&
 154                     rce->rce_ops != RMT_RSETFACL))
 155                         return -EOPNOTSUPP;
 156
 157                 if (rce->rce_ops == RMT_LSETFACL) {
 158                         struct eacl_entry *ee;
 159
 160                         ee = et_search_del(&sbi->ll_et, current_pid(),
 161                                            ll_inode2fid(inode), xattr_type);
 162                         LASSERT(ee != NULL);
 163                         if (valid & OBD_MD_FLXATTR) {
 164                                 acl = lustre_acl_xattr_merge2ext(
 165                                                 (posix_acl_xattr_header *)value,
 166                                                 size, ee->ee_acl);
 167                                 if (IS_ERR(acl)) {
 168                                         ee_free(ee);
 169                                         return PTR_ERR(acl);
 170                                 }
 171                                 size =  CFS_ACL_XATTR_SIZE(\
 172                                                 le32_to_cpu(acl->a_count), \
 173                                                 ext_acl_xattr);
 174                                 pv = (const char *)acl;
 175                         }
 176                         ee_free(ee);
 177                 } else if (rce->rce_ops == RMT_RSETFACL) {
 178                         size = lustre_posix_acl_xattr_filter(
 179                                                 (posix_acl_xattr_header *)value,
 180                                                 size, &new_value);
 181                         if (unlikely(size < 0))
 182                                 return size;
 183
 184                         pv = (const char *)new_value;
 185                 } else
 186                         return -EOPNOTSUPP;
 187
 188                 valid |= rce_ops2valid(rce->rce_ops);
 189         }
 190 #endif
 191                 oc = ll_mdscapa_get(inode);
 192                 rc = md_setxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
 193                                 valid, name, pv, size, 0, flags,
 194                                 ll_i2suppgid(inode), &req);
 195                 capa_put(oc);
 196 #ifdef CONFIG_FS_POSIX_ACL
 197         if (new_value != NULL)
 198                 lustre_posix_acl_xattr_free(new_value, size);
 199         if (acl != NULL)
 200                 lustre_ext_acl_xattr_free(acl);
 201 #endif
 202         if (rc) {
 203                 if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
 204                         LCONSOLE_INFO("Disabling user_xattr feature because it is not supported on the server\n");
 205                         sbi->ll_flags &= ~LL_SBI_USER_XATTR;
 206                 }
 207                 return rc;
 208         }
 209
 210         ptlrpc_req_finished(req);
 211         return 0;
 212 }
 213
 214 int ll_setxattr(struct dentry *dentry, const char *name,
 215                 const void *value, size_t size, int flags)
 216 {
 217         struct inode *inode = dentry->d_inode;
 218
 219         LASSERT(inode);
 220         LASSERT(name);
 221
 222         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
 223                inode->i_ino, inode->i_generation, inode, name);
 224
 225         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_SETXATTR, 1);
 226
 227         if ((strncmp(name, XATTR_TRUSTED_PREFIX,
 228                      sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
 229              strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
 230             (strncmp(name, XATTR_LUSTRE_PREFIX,
 231                      sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
 232              strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
 233                 struct lov_user_md *lump = (struct lov_user_md *)value;
 234                 int rc = 0;
 235
 236                 if (size != 0 && size < sizeof(struct lov_user_md))
 237                         return -EINVAL;
 238
 239                 /* Attributes that are saved via getxattr will always have
 240                  * the stripe_offset as 0.  Instead, the MDS should be
 241                  * allowed to pick the starting OST index.   b=17846 */
 242                 if (lump != NULL && lump->lmm_stripe_offset == 0)
 243                         lump->lmm_stripe_offset = -1;
 244
 245                 if (lump != NULL && S_ISREG(inode->i_mode)) {
 246                         struct file f;
 247                         int flags = FMODE_WRITE;
 248                         int lum_size = (lump->lmm_magic == LOV_USER_MAGIC_V1) ?
 249                                 sizeof(*lump) : sizeof(struct lov_user_md_v3);
 250
 251                         memset(&f, 0, sizeof(f)); /* f.f_flags is used below */
 252                         f.f_dentry = dentry;
 253                         rc = ll_lov_setstripe_ea_info(inode, &f, flags, lump,
 254                                                       lum_size);
 255                         /* b10667: rc always be 0 here for now */
 256                         rc = 0;
 257                 } else if (S_ISDIR(inode->i_mode)) {
 258                         rc = ll_dir_setstripe(inode, lump, 0);
 259                 }
 260
 261                 return rc;
 262
 263         } else if (strcmp(name, XATTR_NAME_LMA) == 0 ||
 264                    strcmp(name, XATTR_NAME_LINK) == 0)
 265                 return 0;
 266
 267         return ll_setxattr_common(inode, name, value, size, flags,
 268                                   OBD_MD_FLXATTR);
 269 }
 270
 271 int ll_removexattr(struct dentry *dentry, const char *name)
 272 {
 273         struct inode *inode = dentry->d_inode;
 274
 275         LASSERT(inode);
 276         LASSERT(name);
 277
 278         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
 279                inode->i_ino, inode->i_generation, inode, name);
 280
 281         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
 282         return ll_setxattr_common(inode, name, NULL, 0, 0,
 283                                   OBD_MD_FLXATTRRM);
 284 }
 285
 286 static
 287 int ll_getxattr_common(struct inode *inode, const char *name,
 288                        void *buffer, size_t size, __u64 valid)
 289 {
 290         struct ll_sb_info *sbi = ll_i2sbi(inode);
 291         struct ptlrpc_request *req = NULL;
 292         struct mdt_body *body;
 293         int xattr_type, rc;
 294         void *xdata;
 295         struct obd_capa *oc;
 296         struct rmtacl_ctl_entry *rce = NULL;
 297         struct ll_inode_info *lli = ll_i2info(inode);
 298
 299         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
 300                inode->i_ino, inode->i_generation, inode);
 301
 302         /* listxattr have slightly different behavior from of ext3:
 303          * without 'user_xattr' ext3 will list all xattr names but
 304          * filtered out "^user..*"; we list them all for simplicity.
 305          */
 306         if (!name) {
 307                 xattr_type = XATTR_OTHER_T;
 308                 goto do_getxattr;
 309         }
 310
 311         xattr_type = get_xattr_type(name);
 312         rc = xattr_type_filter(sbi, xattr_type);
 313         if (rc)
 314                 return rc;
 315
 316         /* b15587: ignore security.capability xattr for now */
 317         if ((xattr_type == XATTR_SECURITY_T &&
 318             strcmp(name, "security.capability") == 0))
 319                 return -ENODATA;
 320
 321         /* LU-549:  Disable security.selinux when selinux is disabled */
 322         if (xattr_type == XATTR_SECURITY_T && !selinux_is_enabled() &&
 323             strcmp(name, "security.selinux") == 0)
 324                 return -EOPNOTSUPP;
 325
 326 #ifdef CONFIG_FS_POSIX_ACL
 327         if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
 328             (xattr_type == XATTR_ACL_ACCESS_T ||
 329             xattr_type == XATTR_ACL_DEFAULT_T)) {
 330                 rce = rct_search(&sbi->ll_rct, current_pid());
 331                 if (rce == NULL ||
 332                     (rce->rce_ops != RMT_LSETFACL &&
 333                     rce->rce_ops != RMT_LGETFACL &&
 334                     rce->rce_ops != RMT_RSETFACL &&
 335                     rce->rce_ops != RMT_RGETFACL))
 336                         return -EOPNOTSUPP;
 337         }
 338
 339         /* posix acl is under protection of LOOKUP lock. when calling to this,
 340          * we just have path resolution to the target inode, so we have great
 341          * chance that cached ACL is uptodate.
 342          */
 343         if (xattr_type == XATTR_ACL_ACCESS_T &&
 344             !(sbi->ll_flags & LL_SBI_RMT_CLIENT)) {
 345
 346                 struct posix_acl *acl;
 347
 348                 spin_lock(&lli->lli_lock);
 349                 acl = posix_acl_dup(lli->lli_posix_acl);
 350                 spin_unlock(&lli->lli_lock);
 351
 352                 if (!acl)
 353                         return -ENODATA;
 354
 355                 rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
 356                 posix_acl_release(acl);
 357                 return rc;
 358         }
 359         if (xattr_type == XATTR_ACL_DEFAULT_T && !S_ISDIR(inode->i_mode))
 360                 return -ENODATA;
 361 #endif
 362
 363 do_getxattr:
 364         if (sbi->ll_xattr_cache_enabled && xattr_type != XATTR_ACL_ACCESS_T) {
 365                 rc = ll_xattr_cache_get(inode, name, buffer, size, valid);
 366                 if (rc == -EAGAIN)
 367                         goto getxattr_nocache;
 368                 if (rc < 0)
 369                         goto out_xattr;
 370
 371                 /* Add "system.posix_acl_access" to the list */
 372                 if (lli->lli_posix_acl != NULL && valid & OBD_MD_FLXATTRLS) {
 373                         if (size == 0) {
 374                                 rc += sizeof(XATTR_NAME_ACL_ACCESS);
 375                         } else if (size - rc >= sizeof(XATTR_NAME_ACL_ACCESS)) {
 376                                 memcpy(buffer + rc, XATTR_NAME_ACL_ACCESS,
 377                                        sizeof(XATTR_NAME_ACL_ACCESS));
 378                                 rc += sizeof(XATTR_NAME_ACL_ACCESS);
 379                         } else {
 380                                 rc = -ERANGE;
 381                                 goto out_xattr;
 382                         }
 383                 }
 384         } else {
 385 getxattr_nocache:
 386                 oc = ll_mdscapa_get(inode);
 387                 rc = md_getxattr(sbi->ll_md_exp, ll_inode2fid(inode), oc,
 388                                 valid | (rce ? rce_ops2valid(rce->rce_ops) : 0),
 389                                 name, NULL, 0, size, 0, &req);
 390                 capa_put(oc);
 391
 392                 if (rc < 0)
 393                         goto out_xattr;
 394
 395                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 396                 LASSERT(body);
 397
 398                 /* only detect the xattr size */
 399                 if (size == 0) {
 400                         rc = body->eadatasize;
 401                         goto out;
 402                 }
 403
 404                 if (size < body->eadatasize) {
 405                         CERROR("server bug: replied size %u > %u\n",
 406                                 body->eadatasize, (int)size);
 407                         rc = -ERANGE;
 408                         goto out;
 409                 }
 410
 411                 if (body->eadatasize == 0) {
 412                         rc = -ENODATA;
 413                         goto out;
 414                 }
 415
 416                 /* do not need swab xattr data */
 417                 xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
 418                                                         body->eadatasize);
 419                 if (!xdata) {
 420                         rc = -EFAULT;
 421                         goto out;
 422                 }
 423
 424                 memcpy(buffer, xdata, body->eadatasize);
 425                 rc = body->eadatasize;
 426         }
 427
 428 #ifdef CONFIG_FS_POSIX_ACL
 429         if (rce && rce->rce_ops == RMT_LSETFACL) {
 430                 ext_acl_xattr_header *acl;
 431
 432                 acl = lustre_posix_acl_xattr_2ext(
 433                                         (posix_acl_xattr_header *)buffer, rc);
 434                 if (IS_ERR(acl)) {
 435                         rc = PTR_ERR(acl);
 436                         goto out;
 437                 }
 438
 439                 rc = ee_add(&sbi->ll_et, current_pid(), ll_inode2fid(inode),
 440                             xattr_type, acl);
 441                 if (unlikely(rc < 0)) {
 442                         lustre_ext_acl_xattr_free(acl);
 443                         goto out;
 444                 }
 445         }
 446 #endif
 447
 448 out_xattr:
 449         if (rc == -EOPNOTSUPP && xattr_type == XATTR_USER_T) {
 450                 LCONSOLE_INFO(
 451                         "%s: disabling user_xattr feature because it is not supported on the server: rc = %d\n",
 452                         ll_get_fsname(inode->i_sb, NULL, 0), rc);
 453                 sbi->ll_flags &= ~LL_SBI_USER_XATTR;
 454         }
 455 out:
 456         ptlrpc_req_finished(req);
 457         return rc;
 458 }
 459
 460 ssize_t ll_getxattr(struct dentry *dentry, const char *name,
 461                     void *buffer, size_t size)
 462 {
 463         struct inode *inode = dentry->d_inode;
 464
 465         LASSERT(inode);
 466         LASSERT(name);
 467
 468         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), xattr %s\n",
 469                inode->i_ino, inode->i_generation, inode, name);
 470
 471         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR, 1);
 472
 473         if ((strncmp(name, XATTR_TRUSTED_PREFIX,
 474                      sizeof(XATTR_TRUSTED_PREFIX) - 1) == 0 &&
 475              strcmp(name + sizeof(XATTR_TRUSTED_PREFIX) - 1, "lov") == 0) ||
 476             (strncmp(name, XATTR_LUSTRE_PREFIX,
 477                      sizeof(XATTR_LUSTRE_PREFIX) - 1) == 0 &&
 478              strcmp(name + sizeof(XATTR_LUSTRE_PREFIX) - 1, "lov") == 0)) {
 479                 struct lov_stripe_md *lsm;
 480                 struct lov_user_md *lump;
 481                 struct lov_mds_md *lmm = NULL;
 482                 struct ptlrpc_request *request = NULL;
 483                 int rc = 0, lmmsize = 0;
 484
 485                 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
 486                         return -ENODATA;
 487
 488                 if (size == 0 && S_ISDIR(inode->i_mode)) {
 489                         /* XXX directory EA is fix for now, optimize to save
 490                          * RPC transfer */
 491                         rc = sizeof(struct lov_user_md);
 492                         goto out;
 493                 }
 494
 495                 lsm = ccc_inode_lsm_get(inode);
 496                 if (lsm == NULL) {
 497                         if (S_ISDIR(inode->i_mode)) {
 498                                 rc = ll_dir_getstripe(inode, &lmm,
 499                                                       &lmmsize, &request);
 500                         } else {
 501                                 rc = -ENODATA;
 502                         }
 503                 } else {
 504                         /* LSM is present already after lookup/getattr call.
 505                          * we need to grab layout lock once it is implemented */
 506                         rc = obd_packmd(ll_i2dtexp(inode), &lmm, lsm);
 507                         lmmsize = rc;
 508                 }
 509                 ccc_inode_lsm_put(inode, lsm);
 510
 511                 if (rc < 0)
 512                         goto out;
 513
 514                 if (size == 0) {
 515                         /* used to call ll_get_max_mdsize() forward to get
 516                          * the maximum buffer size, while some apps (such as
 517                          * rsync 3.0.x) care much about the exact xattr value
 518                          * size */
 519                         rc = lmmsize;
 520                         goto out;
 521                 }
 522
 523                 if (size < lmmsize) {
 524                         CERROR("server bug: replied size %d > %d for %s (%s)\n",
 525                                lmmsize, (int)size, dentry->d_name.name, name);
 526                         rc = -ERANGE;
 527                         goto out;
 528                 }
 529
 530                 lump = (struct lov_user_md *)buffer;
 531                 memcpy(lump, lmm, lmmsize);
 532                 /* do not return layout gen for getxattr otherwise it would
 533                  * confuse tar --xattr by recognizing layout gen as stripe
 534                  * offset when the file is restored. See LU-2809. */
 535                 lump->lmm_layout_gen = 0;
 536
 537                 rc = lmmsize;
 538 out:
 539                 if (request)
 540                         ptlrpc_req_finished(request);
 541                 else if (lmm)
 542                         obd_free_diskmd(ll_i2dtexp(inode), &lmm);
 543                 return rc;
 544         }
 545
 546         return ll_getxattr_common(inode, name, buffer, size, OBD_MD_FLXATTR);
 547 }
 548
 549 ssize_t ll_listxattr(struct dentry *dentry, char *buffer, size_t size)
 550 {
 551         struct inode *inode = dentry->d_inode;
 552         int rc = 0, rc2 = 0;
 553         struct lov_mds_md *lmm = NULL;
 554         struct ptlrpc_request *request = NULL;
 555         int lmmsize;
 556
 557         LASSERT(inode);
 558
 559         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n",
 560                inode->i_ino, inode->i_generation, inode);
 561
 562         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_LISTXATTR, 1);
 563
 564         rc = ll_getxattr_common(inode, NULL, buffer, size, OBD_MD_FLXATTRLS);
 565         if (rc < 0)
 566                 goto out;
 567
 568         if (buffer != NULL) {
 569                 struct ll_sb_info *sbi = ll_i2sbi(inode);
 570                 char *xattr_name = buffer;
 571                 int xlen, rem = rc;
 572
 573                 while (rem > 0) {
 574                         xlen = strnlen(xattr_name, rem - 1) + 1;
 575                         rem -= xlen;
 576                         if (xattr_type_filter(sbi,
 577                                         get_xattr_type(xattr_name)) == 0) {
 578                                 /* skip OK xattr type
 579                                  * leave it in buffer
 580                                  */
 581                                 xattr_name += xlen;
 582                                 continue;
 583                         }
 584                         /* move up remaining xattrs in buffer
 585                          * removing the xattr that is not OK
 586                          */
 587                         memmove(xattr_name, xattr_name + xlen, rem);
 588                         rc -= xlen;
 589                 }
 590         }
 591         if (S_ISREG(inode->i_mode)) {
 592                 if (!ll_i2info(inode)->lli_has_smd)
 593                         rc2 = -1;
 594         } else if (S_ISDIR(inode->i_mode)) {
 595                 rc2 = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
 596         }
 597
 598         if (rc2 < 0) {
 599                 rc2 = 0;
 600                 goto out;
 601         } else if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) {
 602                 const int prefix_len = sizeof(XATTR_LUSTRE_PREFIX) - 1;
 603                 const size_t name_len   = sizeof("lov") - 1;
 604                 const size_t total_len  = prefix_len + name_len + 1;
 605
 606                 if (((rc + total_len) > size) && (buffer != NULL)) {
 607                         ptlrpc_req_finished(request);
 608                         return -ERANGE;
 609                 }
 610
 611                 if (buffer != NULL) {
 612                         buffer += rc;
 613                         memcpy(buffer, XATTR_LUSTRE_PREFIX, prefix_len);
 614                         memcpy(buffer + prefix_len, "lov", name_len);
 615                         buffer[prefix_len + name_len] = '\0';
 616                 }
 617                 rc2 = total_len;
 618         }
 619 out:
 620         ptlrpc_req_finished(request);
 621         rc = rc + rc2;
 622
 623         return rc;
 624 }