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