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