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  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 /* prerequisite for linux/xattr.h */
  52 #include <linux/types.h>
  53 /* prerequisite for linux/xattr.h */
  54 #include <linux/fs.h>
  55 /* XATTR_{REPLACE,CREATE} */
  56 #include <linux/xattr.h>
  57
  58 #include "mdt_internal.h"
  59
  60
  61 /* return EADATA length to the caller. negative value means error */
  62 static int mdt_getxattr_pack_reply(struct mdt_thread_info * info)
  63 {
  64         struct req_capsule     *pill = info->mti_pill ;
  65         struct ptlrpc_request  *req = mdt_info_req(info);
  66         char                   *xattr_name;
  67         __u64                   valid = info->mti_body->valid;
  68         static const char       user_string[] = "user.";
  69         int                     size, rc;
  70         ENTRY;
  71
  72         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETXATTR_PACK))
  73                 RETURN(-ENOMEM);
  74
  75         /* Determine how many bytes we need */
  76         if (valid & OBD_MD_FLXATTR) {
  77                 xattr_name = req_capsule_client_get(pill, &RMF_NAME);
  78                 if (!xattr_name)
  79                         RETURN(-EFAULT);
  80
  81                 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR) &&
  82                     !strncmp(xattr_name, user_string, sizeof(user_string) - 1))
  83                         RETURN(-EOPNOTSUPP);
  84
  85                 size = mo_xattr_get(info->mti_env,
  86                                     mdt_object_child(info->mti_object),
  87                                     &LU_BUF_NULL, xattr_name);
  88         } else if (valid & OBD_MD_FLXATTRLS) {
  89                 size = mo_xattr_list(info->mti_env,
  90                                      mdt_object_child(info->mti_object),
  91                                      &LU_BUF_NULL);
  92         } else {
  93                 CDEBUG(D_INFO, "Valid bits: "LPX64"\n", info->mti_body->valid);
  94                 RETURN(-EINVAL);
  95         }
  96
  97         if (size < 0) {
  98                 if (size == -ENODATA)
  99                         size = 0;
 100                 else if (size != -EOPNOTSUPP) {
 101                         CDEBUG(D_INFO, "Error geting EA size: %d\n", size);
 102                         RETURN(size);
 103                 }
 104         }
 105
 106         if (info->mti_body->eadatasize != 0 &&
 107             info->mti_body->eadatasize < size)
 108                 RETURN(-ERANGE);
 109
 110         req_capsule_set_size(pill, &RMF_EADATA, RCL_SERVER,
 111                              min_t(int, size, info->mti_body->eadatasize));
 112
 113         rc = req_capsule_server_pack(pill);
 114         if (rc) {
 115                 LASSERT(rc < 0);
 116                 RETURN(rc);
 117         }
 118
 119         RETURN(size);
 120 }
 121
 122 int mdt_getxattr(struct mdt_thread_info *info)
 123 {
 124         struct ptlrpc_request  *req = mdt_info_req(info);
 125         struct mdt_export_data *med = mdt_req2med(req);
 126         struct md_ucred        *uc  = mdt_ucred(info);
 127         struct mdt_body        *reqbody;
 128         struct mdt_body        *repbody = NULL;
 129         struct md_object       *next;
 130         struct lu_buf          *buf;
 131         __u32                   remote = exp_connect_rmtclient(info->mti_exp);
 132         __u32                   perm;
 133         int                     easize, rc;
 134         ENTRY;
 135
 136         LASSERT(info->mti_object != NULL);
 137         LASSERT(lu_object_assert_exists(&info->mti_object->mot_obj.mo_lu));
 138
 139         CDEBUG(D_INODE, "getxattr "DFID"\n", PFID(&info->mti_body->fid1));
 140
 141         reqbody = req_capsule_client_get(info->mti_pill, &RMF_MDT_BODY);
 142         if (reqbody == NULL)
 143                 RETURN(err_serious(-EFAULT));
 144
 145         rc = mdt_init_ucred(info, reqbody);
 146         if (rc)
 147                 RETURN(err_serious(rc));
 148
 149         next = mdt_object_child(info->mti_object);
 150
 151         if (info->mti_body->valid & OBD_MD_FLRMTRGETFACL) {
 152                 if (unlikely(!remote))
 153                         GOTO(out, rc = err_serious(-EINVAL));
 154
 155                 perm = mdt_identity_get_perm(uc->mu_identity, remote,
 156                                              req->rq_peer.nid);
 157                 if (!(perm & CFS_RMTACL_PERM))
 158                         GOTO(out, rc = err_serious(-EPERM));
 159
 160                 rc = mo_permission(info->mti_env, NULL, next, NULL,
 161                                    MAY_RGETFACL);
 162                 if (rc)
 163                         GOTO(out, rc = err_serious(rc));
 164         }
 165
 166         easize = mdt_getxattr_pack_reply(info);
 167         if (easize < 0)
 168                 GOTO(out, rc = err_serious(easize));
 169
 170         repbody = req_capsule_server_get(info->mti_pill, &RMF_MDT_BODY);
 171         LASSERT(repbody != NULL);
 172
 173         /* No need further getxattr. */
 174         if (easize == 0 || reqbody->eadatasize == 0)
 175                 GOTO(out, rc = easize);
 176
 177         buf = &info->mti_buf;
 178         buf->lb_buf = req_capsule_server_get(info->mti_pill, &RMF_EADATA);
 179         buf->lb_len = easize;
 180
 181         if (info->mti_body->valid & OBD_MD_FLXATTR) {
 182                 int flags = CFS_IC_NOTHING;
 183                 char *xattr_name = req_capsule_client_get(info->mti_pill,
 184                                                           &RMF_NAME);
 185                 CDEBUG(D_INODE, "getxattr %s\n", xattr_name);
 186
 187                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 188                 if (rc < 0) {
 189                         CERROR("getxattr failed: %d\n", rc);
 190                         GOTO(out, rc);
 191                 }
 192
 193                 if (info->mti_body->valid &
 194                     (OBD_MD_FLRMTLSETFACL | OBD_MD_FLRMTLGETFACL))
 195                         flags = CFS_IC_ALL;
 196                 else if (info->mti_body->valid & OBD_MD_FLRMTRGETFACL)
 197                         flags = CFS_IC_MAPPED;
 198
 199                 if (rc > 0 && flags != CFS_IC_NOTHING) {
 200                         int rc1;
 201
 202                         if (unlikely(!remote))
 203                                 GOTO(out, rc = -EINVAL);
 204
 205                         rc1 = lustre_posix_acl_xattr_id2client(uc,
 206                                         med->med_idmap,
 207                                         (posix_acl_xattr_header *)(buf->lb_buf),
 208                                         rc, flags);
 209                         if (unlikely(rc1 < 0))
 210                                 rc = rc1;
 211                 }
 212         } else if (info->mti_body->valid & OBD_MD_FLXATTRLS) {
 213                 CDEBUG(D_INODE, "listxattr\n");
 214
 215                 rc = mo_xattr_list(info->mti_env, next, buf);
 216                 if (rc < 0)
 217                         CDEBUG(D_INFO, "listxattr failed: %d\n", rc);
 218         } else
 219                 LBUG();
 220
 221         EXIT;
 222 out:
 223         if (rc >= 0) {
 224                 repbody->eadatasize = rc;
 225                 rc = 0;
 226         }
 227         mdt_exit_ucred(info);
 228         return rc;
 229 }
 230
 231 static int mdt_rmtlsetfacl(struct mdt_thread_info *info,
 232                            struct md_object *next,
 233                            const char *xattr_name,
 234                            ext_acl_xattr_header *header,
 235                            posix_acl_xattr_header **out)
 236 {
 237         struct ptlrpc_request  *req = mdt_info_req(info);
 238         struct mdt_export_data *med = mdt_req2med(req);
 239         struct md_ucred        *uc = mdt_ucred(info);
 240         struct lu_buf          *buf = &info->mti_buf;
 241         int                     rc;
 242         ENTRY;
 243
 244         rc = lustre_ext_acl_xattr_id2server(uc, med->med_idmap, header);
 245         if (rc)
 246                 RETURN(rc);
 247
 248         rc = mo_xattr_get(info->mti_env, next, &LU_BUF_NULL, xattr_name);
 249         if (rc == -ENODATA)
 250                 rc = 0;
 251         else if (rc < 0)
 252                 RETURN(rc);
 253
 254         buf->lb_len = rc;
 255         if (buf->lb_len > 0) {
 256                 OBD_ALLOC(buf->lb_buf, buf->lb_len);
 257                 if (unlikely(buf->lb_buf == NULL))
 258                         RETURN(-ENOMEM);
 259
 260                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 261                 if (rc < 0) {
 262                         CERROR("getxattr failed: %d\n", rc);
 263                         GOTO(_out, rc);
 264                 }
 265         } else
 266                 buf->lb_buf = NULL;
 267
 268         rc = lustre_acl_xattr_merge2posix((posix_acl_xattr_header *)(buf->lb_buf),
 269                                           buf->lb_len, header, out);
 270         EXIT;
 271
 272 _out:
 273         if (rc <= 0 && buf->lb_buf != NULL)
 274                 OBD_FREE(buf->lb_buf, buf->lb_len);
 275         return rc;
 276 }
 277
 278 int mdt_reint_setxattr(struct mdt_thread_info *info,
 279                        struct mdt_lock_handle *unused)
 280 {
 281         struct ptlrpc_request   *req = mdt_info_req(info);
 282         struct md_ucred         *uc  = mdt_ucred(info);
 283         struct mdt_lock_handle  *lh;
 284         struct req_capsule      *pill = info->mti_pill;
 285         const struct lu_env     *env  = info->mti_env;
 286         struct lu_buf           *buf  = &info->mti_buf;
 287         struct mdt_reint_record *rr   = &info->mti_rr;
 288         struct md_attr          *ma = &info->mti_attr;
 289         struct lu_attr          *attr = &info->mti_attr.ma_attr;
 290         struct mdt_object       *obj;
 291         struct md_object        *child;
 292         __u64                    valid = attr->la_valid;
 293         const char              *xattr_name;
 294         int                      xattr_len = 0;
 295         __u64                    lockpart;
 296         int                      rc;
 297         posix_acl_xattr_header  *new_xattr = NULL;
 298         __u32                    remote = exp_connect_rmtclient(info->mti_exp);
 299         __u32                    perm;
 300         ENTRY;
 301
 302         CDEBUG(D_INODE, "setxattr for "DFID"\n", PFID(rr->rr_fid1));
 303
 304         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SETXATTR))
 305                 RETURN(err_serious(-ENOMEM));
 306
 307         xattr_name = rr->rr_name;
 308
 309         CDEBUG(D_INODE, "%s xattr %s\n",
 310                valid & OBD_MD_FLXATTR ? "set" : "remove", xattr_name);
 311
 312         rc = mdt_init_ucred_reint(info);
 313         if (rc != 0)
 314                 RETURN(rc);
 315
 316         if (valid & OBD_MD_FLRMTRSETFACL) {
 317                 if (unlikely(!remote))
 318                         GOTO(out, rc = err_serious(-EINVAL));
 319
 320                 perm = mdt_identity_get_perm(uc->mu_identity, remote,
 321                                              req->rq_peer.nid);
 322                 if (!(perm & CFS_RMTACL_PERM))
 323                         GOTO(out, rc = err_serious(-EPERM));
 324         }
 325
 326         /* various sanity check for xattr name */
 327         xattr_name = req_capsule_client_get(pill, &RMF_NAME);
 328         if (!xattr_name)
 329                 GOTO(out, rc = err_serious(-EFAULT));
 330
 331         if (strncmp(xattr_name, XATTR_USER_PREFIX,
 332                     sizeof(XATTR_USER_PREFIX) - 1) == 0) {
 333                 if (strcmp(xattr_name, XATTR_NAME_LOV) == 0)
 334                         GOTO(out, rc = -EACCES);
 335                 if (strcmp(xattr_name, XATTR_NAME_LMA) == 0)
 336                         GOTO(out, rc = 0);
 337                 if (strcmp(xattr_name, XATTR_NAME_LINK) == 0)
 338                         GOTO(out, rc = 0);
 339         }
 340
 341         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR) &&
 342             (strncmp(xattr_name, XATTR_USER_PREFIX,
 343                      sizeof(XATTR_USER_PREFIX) - 1) == 0)) {
 344                 GOTO(out, rc = -EOPNOTSUPP);
 345         }
 346
 347         lockpart = MDS_INODELOCK_UPDATE;
 348         if (!strcmp(xattr_name, XATTR_NAME_ACL_ACCESS))
 349                 lockpart |= MDS_INODELOCK_LOOKUP;
 350
 351         lh = &info->mti_lh[MDT_LH_PARENT];
 352         mdt_lock_reg_init(lh, LCK_PW);
 353         obj = mdt_object_find_lock(info, rr->rr_fid1, lh, lockpart);
 354         if (IS_ERR(obj))
 355                 GOTO(out, rc =  PTR_ERR(obj));
 356
 357         if (unlikely(!(valid & OBD_MD_FLCTIME))) {
 358                 CWARN("client miss to set OBD_MD_FLCTIME when "
 359                       "setxattr: [object "DFID"] [valid %llu]\n",
 360                       PFID(rr->rr_fid1), valid);
 361                 attr->la_ctime = cfs_time_current_sec();
 362         }
 363         attr->la_valid = LA_CTIME;
 364         child = mdt_object_child(obj);
 365         if (valid & OBD_MD_FLXATTR) {
 366                 char * xattr;
 367
 368                 if (!req_capsule_field_present(pill, &RMF_EADATA, RCL_CLIENT)) {
 369                         CDEBUG(D_INFO, "no xattr data supplied\n");
 370                         GOTO(out_unlock, rc = -EFAULT);
 371                 }
 372
 373                 xattr_len = req_capsule_get_size(pill, &RMF_EADATA, RCL_CLIENT);
 374                 if (xattr_len) {
 375                         int flags = 0;
 376
 377                         xattr = req_capsule_client_get(pill, &RMF_EADATA);
 378
 379                         if (valid & OBD_MD_FLRMTLSETFACL) {
 380                                 if (unlikely(!remote))
 381                                         GOTO(out_unlock, rc = -EINVAL);
 382
 383                                 xattr_len = mdt_rmtlsetfacl(info, child,
 384                                                 xattr_name,
 385                                                 (ext_acl_xattr_header *)xattr,
 386                                                 &new_xattr);
 387                                 if (xattr_len < 0)
 388                                         GOTO(out_unlock, rc = xattr_len);
 389
 390                                 xattr = (char *)new_xattr;
 391                         }
 392
 393                         if (attr->la_flags & XATTR_REPLACE)
 394                                 flags |= LU_XATTR_REPLACE;
 395
 396                         if (attr->la_flags & XATTR_CREATE)
 397                                 flags |= LU_XATTR_CREATE;
 398
 399                         mdt_fail_write(env, info->mti_mdt->mdt_bottom,
 400                                        OBD_FAIL_MDS_SETXATTR_WRITE);
 401
 402                         buf->lb_buf = xattr;
 403                         buf->lb_len = xattr_len;
 404                         rc = mo_xattr_set(env, child, buf, xattr_name, flags);
 405                         /* update ctime after xattr changed */
 406                         if (rc == 0) {
 407                                 ma->ma_attr_flags |= MDS_PERM_BYPASS;
 408                                 mo_attr_set(env, child, ma);
 409                         }
 410                 }
 411         } else if (valid & OBD_MD_FLXATTRRM) {
 412                 rc = mo_xattr_del(env, child, xattr_name);
 413                 /* update ctime after xattr changed */
 414                 if (rc == 0) {
 415                         ma->ma_attr_flags |= MDS_PERM_BYPASS;
 416                         mo_attr_set(env, child, ma);
 417                 }
 418         } else {
 419                 CDEBUG(D_INFO, "valid bits: "LPX64"\n", valid);
 420                 rc = -EINVAL;
 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 }