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  *  linux/mdt/mdt_xattr.c
   5  *  Lustre Metadata Target (mdt) extended attributes management.
   6  *
   7  *  Copyright (C) 2002-2006 Cluster File Systems, Inc.
   8  *   Author: Peter Braam <braam@clusterfs.com>
   9  *   Author: Andreas Dilger <adilger@clusterfs.com>
  10  *   Author: Phil Schwan <phil@clusterfs.com>
  11  *   Author: Huang Hua <huanghua@clusterfs.com>
  12  *
  13  *   This file is part of the Lustre file system, http://www.lustre.org
  14  *   Lustre is a trademark of Cluster File Systems, Inc.
  15  *
  16  *   You may have signed or agreed to another license before downloading
  17  *   this software.  If so, you are bound by the terms and conditions
  18  *   of that agreement, and the following does not apply to you.  See the
  19  *   LICENSE file included with this distribution for more information.
  20  *
  21  *   If you did not agree to a different license, then this copy of Lustre
  22  *   is open source software; you can redistribute it and/or modify it
  23  *   under the terms of version 2 of the GNU General Public License as
  24  *   published by the Free Software Foundation.
  25  *
  26  *   In either case, Lustre is distributed in the hope that it will be
  27  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  28  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  *   license text for more details.
  30  */
  31
  32 #ifndef EXPORT_SYMTAB
  33 # define EXPORT_SYMTAB
  34 #endif
  35 #define DEBUG_SUBSYSTEM S_MDS
  36
  37 /* prerequisite for linux/xattr.h */
  38 #include <linux/types.h>
  39 /* prerequisite for linux/xattr.h */
  40 #include <linux/fs.h>
  41 /* XATTR_{REPLACE,CREATE} */
  42 #include <linux/xattr.h>
  43
  44 #include "mdt_internal.h"
  45
  46
  47 /* return EADATA length to the caller. negative value means error */
  48 static int mdt_getxattr_pack_reply(struct mdt_thread_info * info)
  49 {
  50         struct req_capsule     *pill = &info->mti_pill ;
  51         struct ptlrpc_request  *req = mdt_info_req(info);
  52         char                   *xattr_name;
  53         __u64                   valid = info->mti_body->valid;
  54         static const char       user_string[] = "user.";
  55         int                     size, rc;
  56         ENTRY;
  57
  58         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_GETXATTR_PACK))
  59                 RETURN(-ENOMEM);
  60
  61         /* Determine how many bytes we need */
  62         if ((valid & OBD_MD_FLXATTR) == OBD_MD_FLXATTR) {
  63                 xattr_name = req_capsule_client_get(pill, &RMF_NAME);
  64                 if (!xattr_name)
  65                         RETURN(-EFAULT);
  66
  67                 if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR) &&
  68                     !strncmp(xattr_name, user_string, sizeof(user_string) - 1))
  69                         RETURN(-EOPNOTSUPP);
  70
  71                         size = mo_xattr_get(info->mti_env,
  72                                             mdt_object_child(info->mti_object),
  73                                             &LU_BUF_NULL, xattr_name);
  74         } else if ((valid & OBD_MD_FLXATTRLS) == OBD_MD_FLXATTRLS) {
  75                 size = mo_xattr_list(info->mti_env,
  76                                      mdt_object_child(info->mti_object),
  77                                      &LU_BUF_NULL);
  78         } else {
  79                 CERROR("Valid bits: "LPX64"\n", info->mti_body->valid);
  80                 RETURN(-EINVAL);
  81         }
  82
  83         if (size < 0) {
  84                 if (size == -ENODATA)
  85                         size = 0;
  86                 else if (size != -EOPNOTSUPP) {
  87                         CERROR("Error geting EA size: %d\n", size);
  88                         RETURN(size);
  89                 }
  90         }
  91
  92         if (info->mti_body->eadatasize != 0 &&
  93             info->mti_body->eadatasize < size)
  94                 RETURN(-ERANGE);
  95
  96         req_capsule_set_size(pill, &RMF_EADATA, RCL_SERVER,
  97                              min_t(int, size, info->mti_body->eadatasize));
  98
  99         rc = req_capsule_pack(pill);
 100         if (rc) {
 101                 LASSERT(rc < 0);
 102                 RETURN(rc);
 103         }
 104
 105         RETURN(size);
 106 }
 107
 108 int mdt_getxattr(struct mdt_thread_info *info)
 109 {
 110         struct ptlrpc_request  *req = mdt_info_req(info);
 111         struct mdt_export_data *med = mdt_req2med(req);
 112         struct md_ucred        *uc  = mdt_ucred(info);
 113         struct  mdt_body       *reqbody;
 114         struct  mdt_body       *repbody = NULL;
 115         struct  md_object      *next;
 116         struct  lu_buf         *buf;
 117         int                     easize, rc;
 118         ENTRY;
 119
 120         LASSERT(info->mti_object != NULL);
 121         LASSERT(lu_object_assert_exists(&info->mti_object->mot_obj.mo_lu));
 122
 123         CDEBUG(D_INODE, "getxattr "DFID"\n", PFID(&info->mti_body->fid1));
 124
 125         reqbody = req_capsule_client_get(&info->mti_pill, &RMF_MDT_BODY);
 126         if (reqbody == NULL)
 127                 RETURN(err_serious(-EFAULT));
 128
 129         rc = mdt_init_ucred(info, reqbody);
 130         if (rc)
 131                 RETURN(err_serious(rc));
 132
 133         next = mdt_object_child(info->mti_object);
 134
 135         if (info->mti_body->valid & OBD_MD_FLRMTRGETFACL) {
 136                 __u32 perm = mdt_identity_get_perm(uc->mu_identity,
 137                                                    med->med_rmtclient,
 138                                                    req->rq_peer.nid);
 139
 140                 LASSERT(med->med_rmtclient);
 141                 if (!(perm & CFS_RMTACL_PERM))
 142                         GOTO(out, rc = err_serious(-EPERM));
 143
 144                 rc = mo_permission(info->mti_env, NULL, next, NULL,
 145                                    MAY_RGETFACL);
 146                 if (rc)
 147                         GOTO(out, rc = err_serious(rc));
 148         }
 149
 150         easize = mdt_getxattr_pack_reply(info);
 151         if (easize < 0)
 152                 GOTO(out, rc = err_serious(easize));
 153
 154         repbody = req_capsule_server_get(&info->mti_pill, &RMF_MDT_BODY);
 155         LASSERT(repbody != NULL);
 156
 157         /* No need further getxattr. */
 158         if (easize == 0 || reqbody->eadatasize == 0)
 159                 GOTO(out, rc = easize);
 160
 161         buf = &info->mti_buf;
 162         buf->lb_buf = req_capsule_server_get(&info->mti_pill, &RMF_EADATA);
 163         buf->lb_len = easize;
 164
 165         if (info->mti_body->valid & OBD_MD_FLXATTR) {
 166                 int flags = CFS_IC_NOTHING;
 167                 char *xattr_name = req_capsule_client_get(&info->mti_pill,
 168                                                           &RMF_NAME);
 169                 CDEBUG(D_INODE, "getxattr %s\n", xattr_name);
 170
 171                         rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 172                 if (rc < 0) {
 173                         CERROR("getxattr failed: %d\n", rc);
 174                         GOTO(out, rc);
 175                 }
 176
 177                 if (info->mti_body->valid &
 178                     (OBD_MD_FLRMTLSETFACL | OBD_MD_FLRMTLGETFACL))
 179                         flags = CFS_IC_ALL;
 180                 else if (info->mti_body->valid & OBD_MD_FLRMTRGETFACL)
 181                         flags = CFS_IC_MAPPED;
 182
 183                 if (rc > 0 && flags != CFS_IC_NOTHING) {
 184                         int rc1;
 185
 186                         LASSERT(med->med_rmtclient);
 187                         rc1 = lustre_posix_acl_xattr_id2client(uc,
 188                                         med->med_idmap,
 189                                         (posix_acl_xattr_header *)(buf->lb_buf),
 190                                         rc, flags);
 191                         if (unlikely(rc1 < 0))
 192                                 rc = rc1;
 193                 }
 194         } else if (info->mti_body->valid & OBD_MD_FLXATTRLS) {
 195                 CDEBUG(D_INODE, "listxattr\n");
 196
 197                 rc = mo_xattr_list(info->mti_env, next, buf);
 198                 if (rc < 0)
 199                         CERROR("listxattr failed: %d\n", rc);
 200         } else
 201                 LBUG();
 202
 203         EXIT;
 204 out:
 205         if (rc >= 0) {
 206                 repbody->eadatasize = rc;
 207                 rc = 0;
 208         }
 209         mdt_exit_ucred(info);
 210         return rc;
 211 }
 212
 213 static int mdt_rmtlsetfacl(struct mdt_thread_info *info, char *xattr_name,
 214                            ext_acl_xattr_header *header,
 215                            posix_acl_xattr_header **out)
 216 {
 217         struct ptlrpc_request *req = mdt_info_req(info);
 218         struct mdt_export_data *med = mdt_req2med(req);
 219         struct md_ucred *uc = mdt_ucred(info);
 220         struct md_object *next = mdt_object_child(info->mti_object);
 221         struct lu_buf         *buf = &info->mti_buf;
 222         int rc;
 223         ENTRY;
 224
 225         rc = lustre_ext_acl_xattr_id2server(uc, med->med_idmap, header);
 226         if (rc)
 227                 RETURN(rc);
 228
 229         rc = mo_xattr_get(info->mti_env, next, &LU_BUF_NULL, xattr_name);
 230         if (rc == -ENODATA)
 231                 rc = 0;
 232         else if (rc < 0)
 233                 RETURN(rc);
 234
 235         buf->lb_len = rc;
 236         if (buf->lb_len > 0) {
 237                 OBD_ALLOC(buf->lb_buf, buf->lb_len);
 238                 if (unlikely(buf->lb_buf == NULL))
 239                         RETURN(-ENOMEM);
 240
 241                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 242                 if (rc < 0) {
 243                         CERROR("getxattr failed: %d\n", rc);
 244                         GOTO(_out, rc);
 245         }
 246         } else
 247                 buf->lb_buf = NULL;
 248
 249         rc = lustre_acl_xattr_merge2posix((posix_acl_xattr_header *)(buf->lb_buf),
 250                                           buf->lb_len, header, out);
 251         EXIT;
 252
 253 _out:
 254         if (rc <= 0 && buf->lb_buf != NULL)
 255                 OBD_FREE(buf->lb_buf, buf->lb_len);
 256
 257         return rc;
 258 }
 259
 260 int mdt_setxattr(struct mdt_thread_info *info)
 261 {
 262         struct ptlrpc_request   *req = mdt_info_req(info);
 263         struct mdt_export_data  *med = mdt_req2med(req);
 264         struct md_ucred         *uc  = mdt_ucred(info);
 265         struct mdt_body         *reqbody;
 266         const char               user_string[] = "user.";
 267         const char               trust_string[] = "trusted.";
 268         struct mdt_lock_handle  *lh;
 269         struct req_capsule      *pill = &info->mti_pill;
 270         struct mdt_object       *obj  = info->mti_object;
 271         struct mdt_body         *body = (struct mdt_body *)info->mti_body;
 272         const struct lu_env     *env  = info->mti_env;
 273         struct md_object        *child  = mdt_object_child(obj);
 274         struct lu_buf           *buf  = &info->mti_buf;
 275         __u64                    valid  = body->valid;
 276         char                    *xattr_name;
 277         int                      xattr_len = 0;
 278         __u64                    lockpart;
 279         int                      rc;
 280         posix_acl_xattr_header  *new_xattr = NULL;
 281         ENTRY;
 282
 283         CDEBUG(D_INODE, "setxattr "DFID"\n", PFID(&body->fid1));
 284
 285         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SETXATTR))
 286                 RETURN(err_serious(-ENOMEM));
 287
 288         reqbody = req_capsule_client_get(pill, &RMF_MDT_BODY);
 289         if (reqbody == NULL)
 290                 RETURN(err_serious(-EFAULT));
 291
 292         rc = mdt_init_ucred(info, reqbody);
 293         if (rc)
 294                 RETURN(err_serious(rc));
 295
 296         if (valid & OBD_MD_FLRMTRSETFACL) {
 297                 __u32 perm = mdt_identity_get_perm(uc->mu_identity,
 298                                                    med->med_rmtclient,
 299                                                    req->rq_peer.nid);
 300
 301                 LASSERT(med->med_rmtclient);
 302                 if (!(perm & CFS_RMTACL_PERM))
 303                         GOTO(out, rc = err_serious(-EPERM));
 304         }
 305
 306         rc = req_capsule_pack(pill);
 307         if (rc < 0)
 308                 GOTO(out, rc = err_serious(rc));
 309
 310         /* various sanity check for xattr name */
 311         xattr_name = req_capsule_client_get(pill, &RMF_NAME);
 312         if (!xattr_name)
 313                 GOTO(out, rc = err_serious(-EFAULT));
 314
 315         CDEBUG(D_INODE, "%s xattr %s\n",
 316                   body->valid & OBD_MD_FLXATTR ? "set" : "remove", xattr_name);
 317
 318         if (strncmp(xattr_name, trust_string, sizeof(trust_string) - 1) == 0) {
 319                 if (strcmp(xattr_name + 8, XATTR_NAME_LOV) == 0)
 320                         GOTO(out, rc = -EACCES);
 321         }
 322
 323         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR) &&
 324             (strncmp(xattr_name, user_string, sizeof(user_string) - 1) == 0)) {
 325                 GOTO(out, rc = -EOPNOTSUPP);
 326         }
 327
 328         lockpart = MDS_INODELOCK_UPDATE;
 329         if (!strcmp(xattr_name, XATTR_NAME_ACL_ACCESS))
 330                 lockpart |= MDS_INODELOCK_LOOKUP;
 331
 332         lh = &info->mti_lh[MDT_LH_PARENT];
 333         mdt_lock_reg_init(lh, LCK_PW);
 334         rc = mdt_object_lock(info, obj, lh, lockpart, MDT_LOCAL_LOCK);
 335         if (rc != 0)
 336                 GOTO(out, rc);
 337
 338         if ((valid & OBD_MD_FLXATTR) == OBD_MD_FLXATTR) {
 339                 char * xattr;
 340                 if (!req_capsule_field_present(pill, &RMF_EADATA, RCL_CLIENT)) {
 341                         CERROR("no xattr data supplied\n");
 342                         GOTO(out_unlock, rc = -EFAULT);
 343                 }
 344
 345                 xattr_len = req_capsule_get_size(pill, &RMF_EADATA, RCL_CLIENT);
 346                 if (xattr_len) {
 347                         int flags = 0;
 348                         xattr = req_capsule_client_get(pill, &RMF_EADATA);
 349
 350                         if (valid & OBD_MD_FLRMTLSETFACL) {
 351                                 LASSERT(med->med_rmtclient);
 352                                 xattr_len = mdt_rmtlsetfacl(info, xattr_name,
 353                                                 (ext_acl_xattr_header *)xattr,
 354                                                 &new_xattr);
 355                                 if (xattr_len < 0)
 356                                         GOTO(out_unlock, rc = xattr_len);
 357
 358                                 xattr = (char *)new_xattr;
 359                         }
 360
 361                         if (body->flags & XATTR_REPLACE)
 362                                 flags |= LU_XATTR_REPLACE;
 363
 364                         if (body->flags & XATTR_CREATE)
 365                                 flags |= LU_XATTR_CREATE;
 366
 367                         mdt_fail_write(env, info->mti_mdt->mdt_bottom,
 368                                        OBD_FAIL_MDS_SETXATTR_WRITE);
 369
 370                         buf->lb_buf = xattr;
 371                         buf->lb_len = xattr_len;
 372                         rc = mo_xattr_set(env, child, buf, xattr_name, flags);
 373                 }
 374         } else if ((valid & OBD_MD_FLXATTRRM) == OBD_MD_FLXATTRRM) {
 375                 rc = mo_xattr_del(env, child, xattr_name);
 376         } else {
 377                 CERROR("valid bits: "LPX64"\n", body->valid);
 378                 rc = -EINVAL;
 379         }
 380         EXIT;
 381 out_unlock:
 382         if (unlikely(new_xattr != NULL))
 383                 lustre_posix_acl_xattr_free(new_xattr, xattr_len);
 384         mdt_object_unlock(info, obj, lh, rc);
 385 out:
 386         mdt_exit_ucred(info);
 387         return rc;
 388 }