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                 CDEBUG(D_INFO, "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                         CDEBUG(D_INFO, "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_server_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                         CDEBUG(D_INFO, "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,
 214                            struct md_object *next,
 215                            const char *xattr_name,
 216                            ext_acl_xattr_header *header,
 217                            posix_acl_xattr_header **out)
 218 {
 219         struct ptlrpc_request  *req = mdt_info_req(info);
 220         struct mdt_export_data *med = mdt_req2med(req);
 221         struct md_ucred        *uc = mdt_ucred(info);
 222         struct lu_buf          *buf = &info->mti_buf;
 223         int                     rc;
 224         ENTRY;
 225
 226         rc = lustre_ext_acl_xattr_id2server(uc, med->med_idmap, header);
 227         if (rc)
 228                 RETURN(rc);
 229
 230         rc = mo_xattr_get(info->mti_env, next, &LU_BUF_NULL, xattr_name);
 231         if (rc == -ENODATA)
 232                 rc = 0;
 233         else if (rc < 0)
 234                 RETURN(rc);
 235
 236         buf->lb_len = rc;
 237         if (buf->lb_len > 0) {
 238                 OBD_ALLOC(buf->lb_buf, buf->lb_len);
 239                 if (unlikely(buf->lb_buf == NULL))
 240                         RETURN(-ENOMEM);
 241
 242                 rc = mo_xattr_get(info->mti_env, next, buf, xattr_name);
 243                 if (rc < 0) {
 244                         CERROR("getxattr failed: %d\n", rc);
 245                         GOTO(_out, rc);
 246                 }
 247         } else
 248                 buf->lb_buf = NULL;
 249
 250         rc = lustre_acl_xattr_merge2posix((posix_acl_xattr_header *)(buf->lb_buf),
 251                                           buf->lb_len, header, out);
 252         EXIT;
 253
 254 _out:
 255         if (rc <= 0 && buf->lb_buf != NULL)
 256                 OBD_FREE(buf->lb_buf, buf->lb_len);
 257         return rc;
 258 }
 259
 260 int mdt_reint_setxattr(struct mdt_thread_info *info,
 261                        struct mdt_lock_handle *unused)
 262 {
 263         struct ptlrpc_request   *req = mdt_info_req(info);
 264         struct mdt_export_data  *med = mdt_req2med(req);
 265         struct md_ucred         *uc  = mdt_ucred(info);
 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         const struct lu_env     *env  = info->mti_env;
 271         struct lu_buf           *buf  = &info->mti_buf;
 272         struct mdt_reint_record *rr   = &info->mti_rr;
 273         struct lu_attr          *attr = &info->mti_attr.ma_attr;
 274         struct mdt_object       *obj;
 275         struct md_object        *child;
 276         __u64                    valid = attr->la_valid;
 277         const char              *xattr_name;
 278         int                      xattr_len = 0;
 279         __u64                    lockpart;
 280         int                      rc;
 281         posix_acl_xattr_header  *new_xattr = NULL;
 282         ENTRY;
 283
 284         CDEBUG(D_INODE, "setxattr for "DFID"\n", PFID(rr->rr_fid1));
 285
 286         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SETXATTR))
 287                 RETURN(err_serious(-ENOMEM));
 288
 289         xattr_name = rr->rr_name;
 290
 291         CDEBUG(D_INODE, "%s xattr %s\n",
 292                valid & OBD_MD_FLXATTR ? "set" : "remove", xattr_name);
 293
 294         rc = mdt_init_ucred_reint(info);
 295         if (rc != 0)
 296                 RETURN(rc);
 297
 298         if (valid & OBD_MD_FLRMTRSETFACL) {
 299                 __u32 perm = mdt_identity_get_perm(uc->mu_identity,
 300                                                    med->med_rmtclient,
 301                                                    req->rq_peer.nid);
 302
 303                 LASSERT(med->med_rmtclient);
 304                 if (!(perm & CFS_RMTACL_PERM))
 305                         GOTO(out, rc = err_serious(-EPERM));
 306         }
 307
 308         /* various sanity check for xattr name */
 309         xattr_name = req_capsule_client_get(pill, &RMF_NAME);
 310         if (!xattr_name)
 311                 GOTO(out, rc = err_serious(-EFAULT));
 312
 313         if (strncmp(xattr_name, trust_string, sizeof(trust_string) - 1) == 0) {
 314                 if (strcmp(xattr_name + 8, XATTR_NAME_LOV) == 0)
 315                         GOTO(out, rc = -EACCES);
 316         }
 317
 318         if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_XATTR) &&
 319             (strncmp(xattr_name, user_string, sizeof(user_string) - 1) == 0)) {
 320                 GOTO(out, rc = -EOPNOTSUPP);
 321         }
 322
 323         lockpart = MDS_INODELOCK_UPDATE;
 324         if (!strcmp(xattr_name, XATTR_NAME_ACL_ACCESS))
 325                 lockpart |= MDS_INODELOCK_LOOKUP;
 326
 327         lh = &info->mti_lh[MDT_LH_PARENT];
 328         mdt_lock_reg_init(lh, LCK_PW);
 329         obj = mdt_object_find_lock(info, rr->rr_fid1, lh, lockpart);
 330         if (IS_ERR(obj))
 331                 GOTO(out, rc =  PTR_ERR(obj));
 332
 333         child = mdt_object_child(obj);
 334         if ((valid & OBD_MD_FLXATTR) == OBD_MD_FLXATTR) {
 335                 char * xattr;
 336
 337                 if (!req_capsule_field_present(pill, &RMF_EADATA, RCL_CLIENT)) {
 338                         CDEBUG(D_INFO, "no xattr data supplied\n");
 339                         GOTO(out_unlock, rc = -EFAULT);
 340                 }
 341
 342                 xattr_len = req_capsule_get_size(pill, &RMF_EADATA, RCL_CLIENT);
 343                 if (xattr_len) {
 344                         int flags = 0;
 345
 346                         xattr = req_capsule_client_get(pill, &RMF_EADATA);
 347
 348                         if (valid & OBD_MD_FLRMTLSETFACL) {
 349                                 LASSERT(med->med_rmtclient);
 350                                 xattr_len = mdt_rmtlsetfacl(info, child,
 351                                                 xattr_name,
 352                                                 (ext_acl_xattr_header *)xattr,
 353                                                 &new_xattr);
 354                                 if (xattr_len < 0)
 355                                         GOTO(out_unlock, rc = xattr_len);
 356
 357                                 xattr = (char *)new_xattr;
 358                         }
 359
 360                         if (attr->la_flags & XATTR_REPLACE)
 361                                 flags |= LU_XATTR_REPLACE;
 362
 363                         if (attr->la_flags & XATTR_CREATE)
 364                                 flags |= LU_XATTR_CREATE;
 365
 366                         mdt_fail_write(env, info->mti_mdt->mdt_bottom,
 367                                        OBD_FAIL_MDS_SETXATTR_WRITE);
 368
 369                         buf->lb_buf = xattr;
 370                         buf->lb_len = xattr_len;
 371                         rc = mo_xattr_set(env, child, buf, xattr_name, flags);
 372                 }
 373         } else if ((valid & OBD_MD_FLXATTRRM) == OBD_MD_FLXATTRRM) {
 374                 rc = mo_xattr_del(env, child, xattr_name);
 375         } else {
 376                 CDEBUG(D_INFO, "valid bits: "LPX64"\n", valid);
 377                 rc = -EINVAL;
 378         }
 379         EXIT;
 380 out_unlock:
 381         mdt_object_unlock_put(info, obj, lh, rc);
 382         if (unlikely(new_xattr != NULL))
 383                 lustre_posix_acl_xattr_free(new_xattr, xattr_len);
 384 out:
 385         mdt_exit_ucred(info);
 386         return rc;
 387 }