lustre/mdt/mdt_xattr.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  *
  32  * Copyright (c) 2011, 2012, Whamcloud, Inc.
  33  */
  34 /*
  35  * This file is part of Lustre, http://www.lustre.org/
  36  * Lustre is a trademark of Sun Microsystems, Inc.
  37  *
  38  * lustre/mdt/mdt_xattr.c
  39  *
  40  * Lustre Metadata Target (mdt) extended attributes management.
  41  *
  42  * Author: Peter Braam <braam@clusterfs.com>
  43  * Author: Andreas Dilger <adilger@clusterfs.com>
  44  * Author: Phil Schwan <phil@clusterfs.com>
  45  * Author: Huang Hua <huanghua@clusterfs.com>
  46  */
  47
  48 #ifndef EXPORT_SYMTAB
  49 # define EXPORT_SYMTAB
  50 #endif
  51 #define DEBUG_SUBSYSTEM S_MDS
  52
  53 #include <lustre_acl.h>
  54 #include "mdt_internal.h"
  55
  56
  57 /* return EADATA length to the caller. negative value means error */
  58 static int mdt_getxattr_pack_reply(struct mdt_thread_info * info)
  59 {
  60         struct req_capsule     *pill = info->mti_pill ;
  61         struct ptlrpc_request  *req = mdt_info_req(info);
  62         char                   *xattr_name;
  63         __u64                   valid = info->mti_body->valid;
  64         static const char       user_string[] = "user.";
  65         int                     size, rc;
  66         ENTRY;
  67
  68         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETXATTR_PACK))
  69                 RETURN(-ENOMEM);
  70
  71         /* Determine how many bytes we need */
  72         if (valid & OBD_MD_FLXATTR) {
  73                 xattr_name = req_capsule_client_get(pill, &RMF_NAME);
  74                 if (!xattr_name)
  75                         RETURN(-EFAULT);
  76
  77                 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR) &&
  78                     !strncmp(xattr_name, user_string, sizeof(user_string) - 1))
  79                         RETURN(-EOPNOTSUPP);
  80
  81                 size = mo_xattr_get(info->mti_env,
  82                                     mdt_object_child(info->mti_object),
  83                                     &LU_BUF_NULL, xattr_name);
  84         } else if (valid & OBD_MD_FLXATTRLS) {
  85                 size = mo_xattr_list(info->mti_env,
  86                                      mdt_object_child(info->mti_object),
  87                                      &LU_BUF_NULL);
  88         } else {
  89                 CDEBUG(D_INFO, "Valid bits: "LPX64"\n", info->mti_body->valid);
  90                 RETURN(-EINVAL);
  91         }
  92
  93         if (size < 0) {
  94                 if (size == -ENODATA)
  95                         size = 0;
  96                 else if (size != -EOPNOTSUPP) {
  97                         CDEBUG(D_INFO, "Error geting EA size: %d\n", size);
  98                         RETURN(size);
  99                 }
 100         }
 101
 102         if (info->mti_body->eadatasize != 0 &&
 103             info->mti_body->eadatasize < size)
 104                 RETURN(-ERANGE);
 105
 106         req_capsule_set_size(pill, &RMF_EADATA, RCL_SERVER,
 107                              min_t(int, size, info->mti_body->eadatasize));
 108
 109         rc = req_capsule_server_pack(pill);
 110         if (rc) {
 111                 LASSERT(rc < 0);
 112                 RETURN(rc);
 113         }
 114
 115         RETURN(size);
 116 }
 117
 118 int mdt_getxattr(struct mdt_thread_info *info)
 119 {
 120         struct ptlrpc_request  *req = mdt_info_req(info);
 121         struct mdt_export_data *med = mdt_req2med(req);
 122         struct md_ucred        *uc  = mdt_ucred(info);
 123         struct mdt_body        *reqbody;
 124         struct mdt_body        *repbody = NULL;
 125         struct md_object       *next;
 126         struct lu_buf          *buf;
 127         __u32                   remote = exp_connect_rmtclient(info->mti_exp);
 128         __u32                   perm;
 129         int                     easize, rc;
 130         ENTRY;
 131
 132         LASSERT(info->mti_object != NULL);
 133         LASSERT(lu_object_assert_exists(&info->mti_object->mot_obj.mo_lu));
 134
 135         CDEBUG(D_INODE, "getxattr "DFID"\n", PFID(&info->mti_body->fid1));
 136
 137         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
 138         if (reqbody == NULL)
 139                 RETURN(err_serious(-EFAULT));
 140
 141         rc = mdt_init_ucred(info, reqbody);
 142         if (rc)
 143                 RETURN(err_serious(rc));
 144
 145         next = mdt_object_child(info->mti_object);
 146
 147         if (info->mti_body->valid & OBD_MD_FLRMTRGETFACL) {
 148                 if (unlikely(!remote))
 149                         GOTO(out, rc = err_serious(-EINVAL));
 150
 151                 perm = mdt_identity_get_perm(uc->mu_identity, remote,
 152                                              req->rq_peer.nid);
 153                 if (!(perm & CFS_RMTACL_PERM))
 154                         GOTO(out, rc = err_serious(-EPERM));
 155
 156                 rc = mo_permission(info->mti_env, NULL, next, NULL,
 157                                    MAY_RGETFACL);
 158                 if (rc)
 159                         GOTO(out, rc = err_serious(rc));
 160         }
 161
 162         easize = mdt_getxattr_pack_reply(info);
 163         if (easize < 0)
 164                 GOTO(out, rc = err_serious(easize));
 165
 166         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 167         LASSERT(repbody != NULL);
 168
 169         /* No need further getxattr. */
 170         if (easize == 0 || reqbody->eadatasize == 0)
 171                 GOTO(out, rc = easize);
 172
 173         buf = &info->mti_buf;
 174         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_EADATA);
 175         buf->lb_len = easize;
 176
 177         if (info->mti_body->valid & OBD_MD_FLXATTR) {
 178                 int flags = CFS_IC_NOTHING;
 179                 char *xattr_name = req_capsule_client_get(info->mti_pill,
 180                                                           &RMF_NAME);
 181                 CDEBUG(D_INODE, "getxattr %s\n", xattr_name);
 182
 183                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 184                 if (rc < 0) {
 185                         CERROR("getxattr failed: %d\n", rc);
 186                         GOTO(out, rc);
 187                 }
 188
 189                 if (info->mti_body->valid &
 190                     (OBD_MD_FLRMTLSETFACL | OBD_MD_FLRMTLGETFACL))
 191                         flags = CFS_IC_ALL;
 192                 else if (info->mti_body->valid & OBD_MD_FLRMTRGETFACL)
 193                         flags = CFS_IC_MAPPED;
 194
 195                 if (rc > 0 && flags != CFS_IC_NOTHING) {
 196                         int rc1;
 197
 198                         if (unlikely(!remote))
 199                                 GOTO(out, rc = -EINVAL);
 200
 201                         rc1 = lustre_posix_acl_xattr_id2client(uc,
 202                                         med->med_idmap,
 203                                         (posix_acl_xattr_header *)(buf->lb_buf),
 204                                         rc, flags);
 205                         if (unlikely(rc1 < 0))
 206                                 rc = rc1;
 207                 }
 208         } else if (info->mti_body->valid & OBD_MD_FLXATTRLS) {
 209                 CDEBUG(D_INODE, "listxattr\n");
 210
 211                 rc = mo_xattr_list(info->mti_env, next, buf);
 212                 if (rc < 0)
 213                         CDEBUG(D_INFO, "listxattr failed: %d\n", rc);
 214         } else
 215                 LBUG();
 216
 217         EXIT;
 218 out:
 219         if (rc >= 0) {
 220                 mdt_counter_incr(req->rq_export, LPROC_MDT_GETXATTR);
 221                 repbody->eadatasize = rc;
 222                 rc = 0;
 223         }
 224         mdt_exit_ucred(info);
 225         return rc;
 226 }
 227
 228 static int mdt_rmtlsetfacl(struct mdt_thread_info *info,
 229                            struct md_object *next,
 230                            const char *xattr_name,
 231                            ext_acl_xattr_header *header,
 232                            posix_acl_xattr_header **out)
 233 {
 234         struct ptlrpc_request  *req = mdt_info_req(info);
 235         struct mdt_export_data *med = mdt_req2med(req);
 236         struct md_ucred        *uc = mdt_ucred(info);
 237         struct lu_buf          *buf = &info->mti_buf;
 238         int                     rc;
 239         ENTRY;
 240
 241         rc = lustre_ext_acl_xattr_id2server(uc, med->med_idmap, header);
 242         if (rc)
 243                 RETURN(rc);
 244
 245         rc = mo_xattr_get(info->mti_env, next, &LU_BUF_NULL, xattr_name);
 246         if (rc == -ENODATA)
 247                 rc = 0;
 248         else if (rc < 0)
 249                 RETURN(rc);
 250
 251         buf->lb_len = rc;
 252         if (buf->lb_len > 0) {
 253                 OBD_ALLOC_LARGE(buf->lb_buf, buf->lb_len);
 254                 if (unlikely(buf->lb_buf == NULL))
 255                         RETURN(-ENOMEM);
 256
 257                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 258                 if (rc < 0) {
 259                         CERROR("getxattr failed: %d\n", rc);
 260                         GOTO(_out, rc);
 261                 }
 262         } else
 263                 buf->lb_buf = NULL;
 264
 265         rc = lustre_acl_xattr_merge2posix((posix_acl_xattr_header *)(buf->lb_buf),
 266                                           buf->lb_len, header, out);
 267         EXIT;
 268
 269 _out:
 270         if (rc <= 0 && buf->lb_buf != NULL)
 271                 OBD_FREE_LARGE(buf->lb_buf, buf->lb_len);
 272         return rc;
 273 }
 274
 275 int mdt_reint_setxattr(struct mdt_thread_info *info,
 276                        struct mdt_lock_handle *unused)
 277 {
 278         struct ptlrpc_request   *req = mdt_info_req(info);
 279         struct md_ucred         *uc  = mdt_ucred(info);
 280         struct mdt_lock_handle  *lh;
 281         struct req_capsule      *pill = info->mti_pill;
 282         const struct lu_env     *env  = info->mti_env;
 283         struct lu_buf           *buf  = &info->mti_buf;
 284         struct mdt_reint_record *rr   = &info->mti_rr;
 285         struct md_attr          *ma = &info->mti_attr;
 286         struct lu_attr          *attr = &info->mti_attr.ma_attr;
 287         struct mdt_object       *obj;
 288         struct md_object        *child;
 289         __u64                    valid = attr->la_valid;
 290         const char              *xattr_name;
 291         int                      xattr_len = 0;
 292         __u64                    lockpart;
 293         int                      rc;
 294         posix_acl_xattr_header  *new_xattr = NULL;
 295         __u32                    remote = exp_connect_rmtclient(info->mti_exp);
 296         __u32                    perm;
 297         ENTRY;
 298
 299         CDEBUG(D_INODE, "setxattr for "DFID"\n", PFID(rr->rr_fid1));
 300
 301         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SETXATTR))
 302                 RETURN(err_serious(-ENOMEM));
 303
 304         xattr_name = rr->rr_name;
 305
 306         CDEBUG(D_INODE, "%s xattr %s\n",
 307                valid & OBD_MD_FLXATTR ? "set" : "remove", xattr_name);
 308
 309         rc = mdt_init_ucred_reint(info);
 310         if (rc != 0)
 311                 RETURN(rc);
 312
 313         if (valid & OBD_MD_FLRMTRSETFACL) {
 314                 if (unlikely(!remote))
 315                         GOTO(out, rc = err_serious(-EINVAL));
 316
 317                 perm = mdt_identity_get_perm(uc->mu_identity, remote,
 318                                              req->rq_peer.nid);
 319                 if (!(perm & CFS_RMTACL_PERM))
 320                         GOTO(out, rc = err_serious(-EPERM));
 321         }
 322
 323         /* various sanity check for xattr name */
 324         xattr_name = req_capsule_client_get(pill, &RMF_NAME);
 325         if (!xattr_name)
 326                 GOTO(out, rc = err_serious(-EFAULT));
 327
 328         if (strncmp(xattr_name, XATTR_USER_PREFIX,
 329                     sizeof(XATTR_USER_PREFIX) - 1) == 0) {
 330                 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR))
 331                         GOTO(out, rc = -EOPNOTSUPP);
 332                 if (strcmp(xattr_name, XATTR_NAME_LOV) == 0)
 333                         GOTO(out, rc = -EACCES);
 334                 if (strcmp(xattr_name, XATTR_NAME_LMA) == 0)
 335                         GOTO(out, rc = 0);
 336                 if (strcmp(xattr_name, XATTR_NAME_LINK) == 0)
 337                         GOTO(out, rc = 0);
 338         } else if ((valid & OBD_MD_FLXATTR) &&
 339                    (strncmp(xattr_name, XATTR_NAME_ACL_ACCESS,
 340                             sizeof(XATTR_NAME_ACL_ACCESS) - 1) == 0 ||
 341                     strncmp(xattr_name, XATTR_NAME_ACL_DEFAULT,
 342                             sizeof(XATTR_NAME_ACL_DEFAULT) - 1) == 0)) {
 343                 /* currently lustre limit acl access size */
 344                 xattr_len = req_capsule_get_size(pill, &RMF_EADATA, RCL_CLIENT);
 345
 346                 if (xattr_len > LUSTRE_POSIX_ACL_MAX_SIZE)
 347                         GOTO(out, -ERANGE);
 348         }
 349
 350         lockpart = MDS_INODELOCK_UPDATE;
 351         /* Revoke all clients' lookup lock, since the access
 352          * permissions for this inode is changed when ACL_ACCESS is
 353          * set. This isn't needed for ACL_DEFAULT, since that does
 354          * not change the access permissions of this inode, nor any
 355          * other existing inodes. It is setting the ACLs inherited
 356          * by new directories/files at create time. */
 357         if (!strcmp(xattr_name, XATTR_NAME_ACL_ACCESS))
 358                 lockpart |= MDS_INODELOCK_LOOKUP;
 359
 360         lh = &info->mti_lh[MDT_LH_PARENT];
 361         /* ACLs were sent to clients under LCK_CR locks, so taking LCK_EX
 362          * to cancel them. */
 363         mdt_lock_reg_init(lh, LCK_EX);
 364         obj = mdt_object_find_lock(info, rr->rr_fid1, lh, lockpart);
 365         if (IS_ERR(obj))
 366                 GOTO(out, rc =  PTR_ERR(obj));
 367
 368         info->mti_mos = obj;
 369         rc = mdt_version_get_check_save(info, obj, 0);
 370         if (rc)
 371                 GOTO(out_unlock, rc);
 372
 373         if (unlikely(!(valid & OBD_MD_FLCTIME))) {
 374                 /* This isn't strictly an error, but all current clients
 375                  * should set OBD_MD_FLCTIME when setting attributes. */
 376                 CWARN("%s: client miss to set OBD_MD_FLCTIME when "
 377                       "setxattr %s: [object "DFID"] [valid "LPU64"]\n",
 378                       info->mti_exp->exp_obd->obd_name, xattr_name,
 379                       PFID(rr->rr_fid1), valid);
 380                 attr->la_ctime = cfs_time_current_sec();
 381         }
 382         attr->la_valid = LA_CTIME;
 383         child = mdt_object_child(obj);
 384         if (valid & OBD_MD_FLXATTR) {
 385                 char * xattr;
 386
 387                 if (!req_capsule_field_present(pill, &RMF_EADATA, RCL_CLIENT)) {
 388                         CDEBUG(D_INFO, "no xattr data supplied\n");
 389                         GOTO(out_unlock, rc = -EFAULT);
 390                 }
 391
 392                 xattr_len = req_capsule_get_size(pill, &RMF_EADATA, RCL_CLIENT);
 393                 if (xattr_len) {
 394                         int flags = 0;
 395
 396                         xattr = req_capsule_client_get(pill, &RMF_EADATA);
 397
 398                         if (valid & OBD_MD_FLRMTLSETFACL) {
 399                                 if (unlikely(!remote))
 400                                         GOTO(out_unlock, rc = -EINVAL);
 401
 402                                 xattr_len = mdt_rmtlsetfacl(info, child,
 403                                                 xattr_name,
 404                                                 (ext_acl_xattr_header *)xattr,
 405                                                 &new_xattr);
 406                                 if (xattr_len < 0)
 407                                         GOTO(out_unlock, rc = xattr_len);
 408
 409                                 xattr = (char *)new_xattr;
 410                         }
 411
 412                         if (attr->la_flags & XATTR_REPLACE)
 413                                 flags |= LU_XATTR_REPLACE;
 414
 415                         if (attr->la_flags & XATTR_CREATE)
 416                                 flags |= LU_XATTR_CREATE;
 417
 418                         mdt_fail_write(env, info->mti_mdt->mdt_bottom,
 419                                        OBD_FAIL_MDS_SETXATTR_WRITE);
 420
 421                         buf->lb_buf = xattr;
 422                         buf->lb_len = xattr_len;
 423                         rc = mo_xattr_set(env, child, buf, xattr_name, flags);
 424                         /* update ctime after xattr changed */
 425                         if (rc == 0) {
 426                                 ma->ma_attr_flags |= MDS_PERM_BYPASS;
 427                                 mo_attr_set(env, child, ma);
 428                         }
 429                 }
 430         } else if (valid & OBD_MD_FLXATTRRM) {
 431                 rc = mo_xattr_del(env, child, xattr_name);
 432                 /* update ctime after xattr changed */
 433                 if (rc == 0) {
 434                         ma->ma_attr_flags |= MDS_PERM_BYPASS;
 435                         mo_attr_set(env, child, ma);
 436                 }
 437         } else {
 438                 CDEBUG(D_INFO, "valid bits: "LPX64"\n", valid);
 439                 rc = -EINVAL;
 440         }
 441         if (rc == 0)
 442                 mdt_counter_incr(req->rq_export, LPROC_MDT_SETXATTR);
 443
 444         EXIT;
 445 out_unlock:
 446         mdt_object_unlock_put(info, obj, lh, rc);
 447         if (unlikely(new_xattr != NULL))
 448                 lustre_posix_acl_xattr_free(new_xattr, xattr_len);
 449 out:
 450         mdt_exit_ucred(info);
 451         return rc;
 452 }