lustre/llite/llite_lib.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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  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/llite/llite_lib.c
  37  *
  38  * Lustre Light Super operations
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_LLITE
  42
  43 #include <linux/module.h>
  44 #include <linux/statfs.h>
  45 #include <linux/time.h>
  46 #include <linux/types.h>
  47 #include <linux/version.h>
  48 #include <linux/mm.h>
  49 #include <linux/user_namespace.h>
  50 #ifdef HAVE_UIDGID_HEADER
  51 # include <linux/uidgid.h>
  52 #endif
  53
  54 #include <lustre_ioctl.h>
  55 #include <lustre_ha.h>
  56 #include <lustre_dlm.h>
  57 #include <lprocfs_status.h>
  58 #include <lustre_disk.h>
  59 #include <lustre_param.h>
  60 #include <lustre_log.h>
  61 #include <cl_object.h>
  62 #include <obd_cksum.h>
  63 #include "llite_internal.h"
  64
  65 struct kmem_cache *ll_file_data_slab;
  66
  67 #ifndef log2
  68 #define log2(n) ffz(~(n))
  69 #endif
  70
  71 static struct ll_sb_info *ll_init_sbi(void)
  72 {
  73         struct ll_sb_info *sbi = NULL;
  74         unsigned long pages;
  75         unsigned long lru_page_max;
  76         struct sysinfo si;
  77         class_uuid_t uuid;
  78         int i;
  79         ENTRY;
  80
  81         OBD_ALLOC_PTR(sbi);
  82         if (sbi == NULL)
  83                 RETURN(NULL);
  84
  85         spin_lock_init(&sbi->ll_lock);
  86         mutex_init(&sbi->ll_lco.lco_lock);
  87         spin_lock_init(&sbi->ll_pp_extent_lock);
  88         spin_lock_init(&sbi->ll_process_lock);
  89         sbi->ll_rw_stats_on = 0;
  90
  91         si_meminfo(&si);
  92         pages = si.totalram - si.totalhigh;
  93         lru_page_max = pages / 2;
  94
  95         /* initialize ll_cache data */
  96         sbi->ll_cache = cl_cache_init(lru_page_max);
  97         if (sbi->ll_cache == NULL) {
  98                 OBD_FREE(sbi, sizeof(*sbi));
  99                 RETURN(NULL);
 100         }
 101
 102         sbi->ll_ra_info.ra_max_pages_per_file = min(pages / 32,
 103                                            SBI_DEFAULT_READAHEAD_MAX);
 104         sbi->ll_ra_info.ra_max_pages = sbi->ll_ra_info.ra_max_pages_per_file;
 105         sbi->ll_ra_info.ra_max_read_ahead_whole_pages =
 106                                            SBI_DEFAULT_READAHEAD_WHOLE_MAX;
 107         INIT_LIST_HEAD(&sbi->ll_conn_chain);
 108         INIT_LIST_HEAD(&sbi->ll_orphan_dentry_list);
 109
 110         ll_generate_random_uuid(uuid);
 111         class_uuid_unparse(uuid, &sbi->ll_sb_uuid);
 112         CDEBUG(D_CONFIG, "generated uuid: %s\n", sbi->ll_sb_uuid.uuid);
 113
 114         sbi->ll_flags |= LL_SBI_VERBOSE;
 115 #ifdef ENABLE_CHECKSUM
 116         sbi->ll_flags |= LL_SBI_CHECKSUM;
 117 #endif
 118
 119 #ifdef HAVE_LRU_RESIZE_SUPPORT
 120         sbi->ll_flags |= LL_SBI_LRU_RESIZE;
 121 #endif
 122
 123         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
 124                 spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
 125                                pp_r_hist.oh_lock);
 126                 spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
 127                                pp_w_hist.oh_lock);
 128         }
 129
 130         /* metadata statahead is enabled by default */
 131         sbi->ll_sa_max = LL_SA_RPC_DEF;
 132         atomic_set(&sbi->ll_sa_total, 0);
 133         atomic_set(&sbi->ll_sa_wrong, 0);
 134         atomic_set(&sbi->ll_sa_running, 0);
 135         atomic_set(&sbi->ll_agl_total, 0);
 136         sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 137         sbi->ll_flags |= LL_SBI_FAST_READ;
 138
 139         /* root squash */
 140         sbi->ll_squash.rsi_uid = 0;
 141         sbi->ll_squash.rsi_gid = 0;
 142         INIT_LIST_HEAD(&sbi->ll_squash.rsi_nosquash_nids);
 143         init_rwsem(&sbi->ll_squash.rsi_sem);
 144
 145         RETURN(sbi);
 146 }
 147
 148 static void ll_free_sbi(struct super_block *sb)
 149 {
 150         struct ll_sb_info *sbi = ll_s2sbi(sb);
 151         ENTRY;
 152
 153         if (sbi != NULL) {
 154                 if (!list_empty(&sbi->ll_squash.rsi_nosquash_nids))
 155                         cfs_free_nidlist(&sbi->ll_squash.rsi_nosquash_nids);
 156                 if (sbi->ll_cache != NULL) {
 157                         cl_cache_decref(sbi->ll_cache);
 158                         sbi->ll_cache = NULL;
 159                 }
 160                 OBD_FREE(sbi, sizeof(*sbi));
 161         }
 162         EXIT;
 163 }
 164
 165 static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
 166                                     struct vfsmount *mnt)
 167 {
 168         struct inode *root = NULL;
 169         struct ll_sb_info *sbi = ll_s2sbi(sb);
 170         struct obd_device *obd;
 171         struct obd_statfs *osfs = NULL;
 172         struct ptlrpc_request *request = NULL;
 173         struct obd_connect_data *data = NULL;
 174         struct obd_uuid *uuid;
 175         struct md_op_data *op_data;
 176         struct lustre_md lmd;
 177         u64 valid;
 178         int size, err, checksum;
 179         ENTRY;
 180
 181         obd = class_name2obd(md);
 182         if (!obd) {
 183                 CERROR("MD %s: not setup or attached\n", md);
 184                 RETURN(-EINVAL);
 185         }
 186
 187         OBD_ALLOC_PTR(data);
 188         if (data == NULL)
 189                 RETURN(-ENOMEM);
 190
 191         OBD_ALLOC_PTR(osfs);
 192         if (osfs == NULL) {
 193                 OBD_FREE_PTR(data);
 194                 RETURN(-ENOMEM);
 195         }
 196
 197         /* indicate the features supported by this client */
 198         data->ocd_connect_flags = OBD_CONNECT_IBITS    | OBD_CONNECT_NODEVOH  |
 199                                   OBD_CONNECT_ATTRFID  |
 200                                   OBD_CONNECT_VERSION  | OBD_CONNECT_BRW_SIZE |
 201                                   OBD_CONNECT_MDS_CAPA | OBD_CONNECT_OSS_CAPA |
 202                                   OBD_CONNECT_CANCELSET | OBD_CONNECT_FID     |
 203                                   OBD_CONNECT_AT       | OBD_CONNECT_LOV_V3   |
 204                                   OBD_CONNECT_RMT_CLIENT | OBD_CONNECT_VBR    |
 205                                   OBD_CONNECT_FULL20   | OBD_CONNECT_64BITHASH|
 206                                   OBD_CONNECT_EINPROGRESS |
 207                                   OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
 208                                   OBD_CONNECT_LAYOUTLOCK | OBD_CONNECT_PINGLESS |
 209                                   OBD_CONNECT_MAX_EASIZE |
 210                                   OBD_CONNECT_FLOCK_DEAD |
 211                                   OBD_CONNECT_DISP_STRIPE | OBD_CONNECT_LFSCK |
 212                                   OBD_CONNECT_OPEN_BY_FID |
 213                                   OBD_CONNECT_DIR_STRIPE |
 214                                   OBD_CONNECT_BULK_MBITS |
 215                                   OBD_CONNECT_SUBTREE;
 216
 217 #ifdef HAVE_LRU_RESIZE_SUPPORT
 218         if (sbi->ll_flags & LL_SBI_LRU_RESIZE)
 219                 data->ocd_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 220 #endif
 221 #ifdef CONFIG_FS_POSIX_ACL
 222         data->ocd_connect_flags |= OBD_CONNECT_ACL | OBD_CONNECT_UMASK;
 223 #endif
 224
 225         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_LIGHTWEIGHT))
 226                 /* flag mdc connection as lightweight, only used for test
 227                  * purpose, use with care */
 228                 data->ocd_connect_flags |= OBD_CONNECT_LIGHTWEIGHT;
 229
 230         data->ocd_ibits_known = MDS_INODELOCK_FULL;
 231         data->ocd_version = LUSTRE_VERSION_CODE;
 232
 233         if (sb->s_flags & MS_RDONLY)
 234                 data->ocd_connect_flags |= OBD_CONNECT_RDONLY;
 235         if (sbi->ll_flags & LL_SBI_USER_XATTR)
 236                 data->ocd_connect_flags |= OBD_CONNECT_XATTR;
 237
 238         if (sbi->ll_flags & LL_SBI_FLOCK)
 239                 sbi->ll_fop = &ll_file_operations_flock;
 240         else if (sbi->ll_flags & LL_SBI_LOCALFLOCK)
 241                 sbi->ll_fop = &ll_file_operations;
 242         else
 243                 sbi->ll_fop = &ll_file_operations_noflock;
 244
 245         /* real client */
 246         data->ocd_connect_flags |= OBD_CONNECT_REAL;
 247         if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 248                 data->ocd_connect_flags |= OBD_CONNECT_RMT_CLIENT_FORCE;
 249
 250         /* always ping even if server suppress_pings */
 251         if (sbi->ll_flags & LL_SBI_ALWAYS_PING)
 252                 data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
 253
 254         data->ocd_brw_size = MD_MAX_BRW_SIZE;
 255
 256         err = obd_connect(NULL, &sbi->ll_md_exp, obd, &sbi->ll_sb_uuid, data, NULL);
 257         if (err == -EBUSY) {
 258                 LCONSOLE_ERROR_MSG(0x14f, "An MDT (md %s) is performing "
 259                                    "recovery, of which this client is not a "
 260                                    "part. Please wait for recovery to complete,"
 261                                    " abort, or time out.\n", md);
 262                 GOTO(out, err);
 263         } else if (err) {
 264                 CERROR("cannot connect to %s: rc = %d\n", md, err);
 265                 GOTO(out, err);
 266         }
 267
 268         sbi->ll_md_exp->exp_connect_data = *data;
 269
 270         err = obd_fid_init(sbi->ll_md_exp->exp_obd, sbi->ll_md_exp,
 271                            LUSTRE_SEQ_METADATA);
 272         if (err) {
 273                 CERROR("%s: Can't init metadata layer FID infrastructure, "
 274                        "rc = %d\n", sbi->ll_md_exp->exp_obd->obd_name, err);
 275                 GOTO(out_md, err);
 276         }
 277
 278         /* For mount, we only need fs info from MDT0, and also in DNE, it
 279          * can make sure the client can be mounted as long as MDT0 is
 280          * avaible */
 281         err = obd_statfs(NULL, sbi->ll_md_exp, osfs,
 282                         cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 283                         OBD_STATFS_FOR_MDT0);
 284         if (err)
 285                 GOTO(out_md_fid, err);
 286
 287         /* This needs to be after statfs to ensure connect has finished.
 288          * Note that "data" does NOT contain the valid connect reply.
 289          * If connecting to a 1.8 server there will be no LMV device, so
 290          * we can access the MDC export directly and exp_connect_flags will
 291          * be non-zero, but if accessing an upgraded 2.1 server it will
 292          * have the correct flags filled in.
 293          * XXX: fill in the LMV exp_connect_flags from MDC(s). */
 294         valid = exp_connect_flags(sbi->ll_md_exp) & CLIENT_CONNECT_MDT_REQD;
 295         if (exp_connect_flags(sbi->ll_md_exp) != 0 &&
 296             valid != CLIENT_CONNECT_MDT_REQD) {
 297                 char *buf;
 298
 299                 OBD_ALLOC_WAIT(buf, PAGE_CACHE_SIZE);
 300                 obd_connect_flags2str(buf, PAGE_CACHE_SIZE,
 301                                       valid ^ CLIENT_CONNECT_MDT_REQD, ",");
 302                 LCONSOLE_ERROR_MSG(0x170, "Server %s does not support "
 303                                    "feature(s) needed for correct operation "
 304                                    "of this client (%s). Please upgrade "
 305                                    "server or downgrade client.\n",
 306                                    sbi->ll_md_exp->exp_obd->obd_name, buf);
 307                 OBD_FREE(buf, PAGE_CACHE_SIZE);
 308                 GOTO(out_md_fid, err = -EPROTO);
 309         }
 310
 311         size = sizeof(*data);
 312         err = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_CONN_DATA),
 313                            KEY_CONN_DATA,  &size, data);
 314         if (err) {
 315                 CERROR("%s: Get connect data failed: rc = %d\n",
 316                        sbi->ll_md_exp->exp_obd->obd_name, err);
 317                 GOTO(out_md_fid, err);
 318         }
 319
 320         LASSERT(osfs->os_bsize);
 321         sb->s_blocksize = osfs->os_bsize;
 322         sb->s_blocksize_bits = log2(osfs->os_bsize);
 323         sb->s_magic = LL_SUPER_MAGIC;
 324         sb->s_maxbytes = MAX_LFS_FILESIZE;
 325         sbi->ll_namelen = osfs->os_namelen;
 326
 327         if ((sbi->ll_flags & LL_SBI_USER_XATTR) &&
 328             !(data->ocd_connect_flags & OBD_CONNECT_XATTR)) {
 329                 LCONSOLE_INFO("Disabling user_xattr feature because "
 330                               "it is not supported on the server\n");
 331                 sbi->ll_flags &= ~LL_SBI_USER_XATTR;
 332         }
 333
 334         if (data->ocd_connect_flags & OBD_CONNECT_ACL) {
 335 #ifdef MS_POSIXACL
 336                 sb->s_flags |= MS_POSIXACL;
 337 #endif
 338                 sbi->ll_flags |= LL_SBI_ACL;
 339         } else {
 340                 LCONSOLE_INFO("client wants to enable acl, but mdt not!\n");
 341 #ifdef MS_POSIXACL
 342                 sb->s_flags &= ~MS_POSIXACL;
 343 #endif
 344                 sbi->ll_flags &= ~LL_SBI_ACL;
 345         }
 346
 347         if (data->ocd_connect_flags & OBD_CONNECT_RMT_CLIENT) {
 348                 if (!(sbi->ll_flags & LL_SBI_RMT_CLIENT)) {
 349                         sbi->ll_flags |= LL_SBI_RMT_CLIENT;
 350                         LCONSOLE_INFO("client is set as remote by default.\n");
 351                 }
 352         } else {
 353                 if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
 354                         sbi->ll_flags &= ~LL_SBI_RMT_CLIENT;
 355                         LCONSOLE_INFO("client claims to be remote, but server "
 356                                       "rejected, forced to be local.\n");
 357                 }
 358         }
 359
 360         if (data->ocd_connect_flags & OBD_CONNECT_64BITHASH)
 361                 sbi->ll_flags |= LL_SBI_64BIT_HASH;
 362
 363         if (data->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
 364                 sbi->ll_md_brw_pages = data->ocd_brw_size >> PAGE_CACHE_SHIFT;
 365         else
 366                 sbi->ll_md_brw_pages = 1;
 367
 368         if (data->ocd_connect_flags & OBD_CONNECT_LAYOUTLOCK)
 369                 sbi->ll_flags |= LL_SBI_LAYOUT_LOCK;
 370
 371         if (data->ocd_ibits_known & MDS_INODELOCK_XATTR) {
 372                 if (!(data->ocd_connect_flags & OBD_CONNECT_MAX_EASIZE)) {
 373                         LCONSOLE_INFO("%s: disabling xattr cache due to "
 374                                       "unknown maximum xattr size.\n", dt);
 375                 } else {
 376                         sbi->ll_flags |= LL_SBI_XATTR_CACHE;
 377                         sbi->ll_xattr_cache_enabled = 1;
 378                 }
 379         }
 380
 381         obd = class_name2obd(dt);
 382         if (!obd) {
 383                 CERROR("DT %s: not setup or attached\n", dt);
 384                 GOTO(out_md_fid, err = -ENODEV);
 385         }
 386
 387         /* pass client page size via ocd_grant_blkbits, the server should report
 388          * back its backend blocksize for grant calculation purpose */
 389         data->ocd_grant_blkbits = PAGE_SHIFT;
 390
 391         data->ocd_connect_flags = OBD_CONNECT_GRANT     | OBD_CONNECT_VERSION  |
 392                                   OBD_CONNECT_REQPORTAL | OBD_CONNECT_BRW_SIZE |
 393                                   OBD_CONNECT_CANCELSET | OBD_CONNECT_FID      |
 394                                   OBD_CONNECT_SRVLOCK   | OBD_CONNECT_TRUNCLOCK|
 395                                   OBD_CONNECT_AT | OBD_CONNECT_RMT_CLIENT |
 396                                   OBD_CONNECT_OSS_CAPA | OBD_CONNECT_VBR|
 397                                   OBD_CONNECT_FULL20 | OBD_CONNECT_64BITHASH |
 398                                   OBD_CONNECT_MAXBYTES |
 399                                   OBD_CONNECT_EINPROGRESS |
 400                                   OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
 401                                   OBD_CONNECT_LAYOUTLOCK |
 402                                   OBD_CONNECT_PINGLESS | OBD_CONNECT_LFSCK |
 403                                   OBD_CONNECT_BULK_MBITS;
 404
 405         if (!OBD_FAIL_CHECK(OBD_FAIL_OSC_CONNECT_GRANT_PARAM))
 406                 data->ocd_connect_flags |= OBD_CONNECT_GRANT_PARAM;
 407
 408         if (!OBD_FAIL_CHECK(OBD_FAIL_OSC_CONNECT_CKSUM)) {
 409                 /* OBD_CONNECT_CKSUM should always be set, even if checksums are
 410                  * disabled by default, because it can still be enabled on the
 411                  * fly via /proc. As a consequence, we still need to come to an
 412                  * agreement on the supported algorithms at connect time */
 413                 data->ocd_connect_flags |= OBD_CONNECT_CKSUM;
 414
 415                 if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CKSUM_ADLER_ONLY))
 416                         data->ocd_cksum_types = OBD_CKSUM_ADLER;
 417                 else
 418                         data->ocd_cksum_types = cksum_types_supported_client();
 419         }
 420
 421 #ifdef HAVE_LRU_RESIZE_SUPPORT
 422         data->ocd_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 423 #endif
 424         if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 425                 data->ocd_connect_flags |= OBD_CONNECT_RMT_CLIENT_FORCE;
 426
 427         /* always ping even if server suppress_pings */
 428         if (sbi->ll_flags & LL_SBI_ALWAYS_PING)
 429                 data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
 430
 431         CDEBUG(D_RPCTRACE, "ocd_connect_flags: "LPX64" ocd_version: %d "
 432                "ocd_grant: %d\n", data->ocd_connect_flags,
 433                data->ocd_version, data->ocd_grant);
 434
 435         obd->obd_upcall.onu_owner = &sbi->ll_lco;
 436         obd->obd_upcall.onu_upcall = cl_ocd_update;
 437
 438         data->ocd_brw_size = DT_MAX_BRW_SIZE;
 439
 440         err = obd_connect(NULL, &sbi->ll_dt_exp, obd, &sbi->ll_sb_uuid, data,
 441                           NULL);
 442         if (err == -EBUSY) {
 443                 LCONSOLE_ERROR_MSG(0x150, "An OST (dt %s) is performing "
 444                                    "recovery, of which this client is not a "
 445                                    "part.  Please wait for recovery to "
 446                                    "complete, abort, or time out.\n", dt);
 447                 GOTO(out_md, err);
 448         } else if (err) {
 449                 CERROR("%s: Cannot connect to %s: rc = %d\n",
 450                        sbi->ll_dt_exp->exp_obd->obd_name, dt, err);
 451                 GOTO(out_md, err);
 452         }
 453
 454         sbi->ll_dt_exp->exp_connect_data = *data;
 455
 456         err = obd_fid_init(sbi->ll_dt_exp->exp_obd, sbi->ll_dt_exp,
 457                            LUSTRE_SEQ_METADATA);
 458         if (err) {
 459                 CERROR("%s: Can't init data layer FID infrastructure, "
 460                        "rc = %d\n", sbi->ll_dt_exp->exp_obd->obd_name, err);
 461                 GOTO(out_dt, err);
 462         }
 463
 464         mutex_lock(&sbi->ll_lco.lco_lock);
 465         sbi->ll_lco.lco_flags = data->ocd_connect_flags;
 466         sbi->ll_lco.lco_md_exp = sbi->ll_md_exp;
 467         sbi->ll_lco.lco_dt_exp = sbi->ll_dt_exp;
 468         mutex_unlock(&sbi->ll_lco.lco_lock);
 469
 470         fid_zero(&sbi->ll_root_fid);
 471         err = md_get_root(sbi->ll_md_exp, get_mount_fileset(sb),
 472                            &sbi->ll_root_fid);
 473         if (err) {
 474                 CERROR("cannot mds_connect: rc = %d\n", err);
 475                 GOTO(out_lock_cn_cb, err);
 476         }
 477         if (!fid_is_sane(&sbi->ll_root_fid)) {
 478                 CERROR("%s: Invalid root fid "DFID" during mount\n",
 479                        sbi->ll_md_exp->exp_obd->obd_name,
 480                        PFID(&sbi->ll_root_fid));
 481                 GOTO(out_lock_cn_cb, err = -EINVAL);
 482         }
 483         CDEBUG(D_SUPER, "rootfid "DFID"\n", PFID(&sbi->ll_root_fid));
 484
 485         sb->s_op = &lustre_super_operations;
 486 #if THREAD_SIZE >= 8192 /*b=17630*/
 487         sb->s_export_op = &lustre_export_operations;
 488 #endif
 489
 490         /* make root inode
 491          * XXX: move this to after cbd setup? */
 492         valid = OBD_MD_FLGETATTR | OBD_MD_FLBLOCKS | OBD_MD_FLMODEASIZE;
 493         if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 494                 valid |= OBD_MD_FLRMTPERM;
 495         else if (sbi->ll_flags & LL_SBI_ACL)
 496                 valid |= OBD_MD_FLACL;
 497
 498         OBD_ALLOC_PTR(op_data);
 499         if (op_data == NULL)
 500                 GOTO(out_lock_cn_cb, err = -ENOMEM);
 501
 502         op_data->op_fid1 = sbi->ll_root_fid;
 503         op_data->op_mode = 0;
 504         op_data->op_valid = valid;
 505
 506         err = md_getattr(sbi->ll_md_exp, op_data, &request);
 507
 508         OBD_FREE_PTR(op_data);
 509         if (err) {
 510                 CERROR("%s: md_getattr failed for root: rc = %d\n",
 511                        sbi->ll_md_exp->exp_obd->obd_name, err);
 512                 GOTO(out_lock_cn_cb, err);
 513         }
 514
 515         err = md_get_lustre_md(sbi->ll_md_exp, request, sbi->ll_dt_exp,
 516                                sbi->ll_md_exp, &lmd);
 517         if (err) {
 518                 CERROR("failed to understand root inode md: rc = %d\n", err);
 519                 ptlrpc_req_finished(request);
 520                 GOTO(out_lock_cn_cb, err);
 521         }
 522
 523         LASSERT(fid_is_sane(&sbi->ll_root_fid));
 524         root = ll_iget(sb, cl_fid_build_ino(&sbi->ll_root_fid,
 525                                             sbi->ll_flags & LL_SBI_32BIT_API),
 526                        &lmd);
 527         md_free_lustre_md(sbi->ll_md_exp, &lmd);
 528         ptlrpc_req_finished(request);
 529
 530         if (IS_ERR(root)) {
 531 #ifdef CONFIG_FS_POSIX_ACL
 532                 if (lmd.posix_acl) {
 533                         posix_acl_release(lmd.posix_acl);
 534                         lmd.posix_acl = NULL;
 535                 }
 536 #endif
 537                 err = IS_ERR(root) ? PTR_ERR(root) : -EBADF;
 538                 root = NULL;
 539                 CERROR("lustre_lite: bad iget4 for root\n");
 540                 GOTO(out_root, err);
 541         }
 542
 543 #ifdef CONFIG_FS_POSIX_ACL
 544         if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
 545                 rct_init(&sbi->ll_rct);
 546                 et_init(&sbi->ll_et);
 547         }
 548 #endif
 549
 550         checksum = sbi->ll_flags & LL_SBI_CHECKSUM;
 551         err = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CHECKSUM),
 552                                  KEY_CHECKSUM, sizeof(checksum), &checksum,
 553                                  NULL);
 554         cl_sb_init(sb);
 555
 556         err = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CACHE_SET),
 557                                  KEY_CACHE_SET, sizeof(*sbi->ll_cache),
 558                                  sbi->ll_cache, NULL);
 559
 560         sb->s_root = d_make_root(root);
 561         if (sb->s_root == NULL) {
 562                 CERROR("%s: can't make root dentry\n",
 563                         ll_get_fsname(sb, NULL, 0));
 564                 GOTO(out_root, err = -ENOMEM);
 565         }
 566 #ifdef HAVE_DCACHE_LOCK
 567         sb->s_root->d_op = &ll_d_ops;
 568 #endif
 569
 570         sbi->ll_sdev_orig = sb->s_dev;
 571
 572         /* We set sb->s_dev equal on all lustre clients in order to support
 573          * NFS export clustering.  NFSD requires that the FSID be the same
 574          * on all clients. */
 575         /* s_dev is also used in lt_compare() to compare two fs, but that is
 576          * only a node-local comparison. */
 577         uuid = obd_get_uuid(sbi->ll_md_exp);
 578         if (uuid != NULL)
 579                 sb->s_dev = get_uuid2int(uuid->uuid, strlen(uuid->uuid));
 580
 581         if (data != NULL)
 582                 OBD_FREE_PTR(data);
 583         if (osfs != NULL)
 584                 OBD_FREE_PTR(osfs);
 585         if (proc_lustre_fs_root != NULL) {
 586                 err = lprocfs_register_mountpoint(proc_lustre_fs_root, sb,
 587                                                   dt, md);
 588                 if (err < 0) {
 589                         CERROR("%s: could not register mount in lprocfs: "
 590                                "rc = %d\n", ll_get_fsname(sb, NULL, 0), err);
 591                         err = 0;
 592                 }
 593         }
 594
 595         RETURN(err);
 596 out_root:
 597         if (root)
 598                 iput(root);
 599 out_lock_cn_cb:
 600         obd_fid_fini(sbi->ll_dt_exp->exp_obd);
 601 out_dt:
 602         obd_disconnect(sbi->ll_dt_exp);
 603         sbi->ll_dt_exp = NULL;
 604 out_md_fid:
 605         obd_fid_fini(sbi->ll_md_exp->exp_obd);
 606 out_md:
 607         obd_disconnect(sbi->ll_md_exp);
 608         sbi->ll_md_exp = NULL;
 609 out:
 610         if (data != NULL)
 611                 OBD_FREE_PTR(data);
 612         if (osfs != NULL)
 613                 OBD_FREE_PTR(osfs);
 614         return err;
 615 }
 616
 617 int ll_get_max_mdsize(struct ll_sb_info *sbi, int *lmmsize)
 618 {
 619         int size, rc;
 620
 621         size = sizeof(*lmmsize);
 622         rc = obd_get_info(NULL, sbi->ll_dt_exp, sizeof(KEY_MAX_EASIZE),
 623                           KEY_MAX_EASIZE, &size, lmmsize);
 624         if (rc != 0) {
 625                 CERROR("%s: cannot get max LOV EA size: rc = %d\n",
 626                        sbi->ll_dt_exp->exp_obd->obd_name, rc);
 627                 RETURN(rc);
 628         }
 629
 630         size = sizeof(int);
 631         rc = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_MAX_EASIZE),
 632                           KEY_MAX_EASIZE, &size, lmmsize);
 633         if (rc)
 634                 CERROR("Get max mdsize error rc %d\n", rc);
 635
 636         RETURN(rc);
 637 }
 638
 639 /**
 640  * Get the value of the default_easize parameter.
 641  *
 642  * \see client_obd::cl_default_mds_easize
 643  *
 644  * \param[in] sbi       superblock info for this filesystem
 645  * \param[out] lmmsize  pointer to storage location for value
 646  *
 647  * \retval 0            on success
 648  * \retval negative     negated errno on failure
 649  */
 650 int ll_get_default_mdsize(struct ll_sb_info *sbi, int *lmmsize)
 651 {
 652         int size, rc;
 653
 654         size = sizeof(int);
 655         rc = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_DEFAULT_EASIZE),
 656                          KEY_DEFAULT_EASIZE, &size, lmmsize);
 657         if (rc)
 658                 CERROR("Get default mdsize error rc %d\n", rc);
 659
 660         RETURN(rc);
 661 }
 662
 663 /**
 664  * Set the default_easize parameter to the given value.
 665  *
 666  * \see client_obd::cl_default_mds_easize
 667  *
 668  * \param[in] sbi       superblock info for this filesystem
 669  * \param[in] lmmsize   the size to set
 670  *
 671  * \retval 0            on success
 672  * \retval negative     negated errno on failure
 673  */
 674 int ll_set_default_mdsize(struct ll_sb_info *sbi, int lmmsize)
 675 {
 676         int rc;
 677
 678         if (lmmsize < sizeof(struct lov_mds_md) ||
 679             lmmsize > OBD_MAX_DEFAULT_EA_SIZE)
 680                 return -EINVAL;
 681
 682         rc = obd_set_info_async(NULL, sbi->ll_md_exp,
 683                                 sizeof(KEY_DEFAULT_EASIZE), KEY_DEFAULT_EASIZE,
 684                                 sizeof(int), &lmmsize, NULL);
 685
 686         RETURN(rc);
 687 }
 688
 689 static void ll_dump_inode(struct inode *inode)
 690 {
 691         struct ll_d_hlist_node *tmp;
 692         int dentry_count = 0;
 693
 694         LASSERT(inode != NULL);
 695
 696         ll_d_hlist_for_each(tmp, &inode->i_dentry)
 697                 dentry_count++;
 698
 699         CERROR("%s: inode %p dump: dev=%s fid="DFID
 700                " mode=%o count=%u, %d dentries\n",
 701                ll_get_fsname(inode->i_sb, NULL, 0), inode,
 702                ll_i2mdexp(inode)->exp_obd->obd_name, PFID(ll_inode2fid(inode)),
 703                inode->i_mode, atomic_read(&inode->i_count), dentry_count);
 704 }
 705
 706 void lustre_dump_dentry(struct dentry *dentry, int recur)
 707 {
 708         struct list_head *tmp;
 709         int subdirs = 0;
 710
 711         LASSERT(dentry != NULL);
 712
 713         list_for_each(tmp, &dentry->d_subdirs)
 714                 subdirs++;
 715
 716         CERROR("dentry %p dump: name=%.*s parent=%.*s (%p), inode=%p, count=%u,"
 717                " flags=0x%x, fsdata=%p, %d subdirs\n", dentry,
 718                dentry->d_name.len, dentry->d_name.name,
 719                dentry->d_parent->d_name.len, dentry->d_parent->d_name.name,
 720                dentry->d_parent, dentry->d_inode, ll_d_count(dentry),
 721                dentry->d_flags, dentry->d_fsdata, subdirs);
 722         if (dentry->d_inode != NULL)
 723                 ll_dump_inode(dentry->d_inode);
 724
 725         if (recur == 0)
 726                 return;
 727
 728         list_for_each(tmp, &dentry->d_subdirs) {
 729                 struct dentry *d = list_entry(tmp, struct dentry, d_child);
 730                 lustre_dump_dentry(d, recur - 1);
 731         }
 732 }
 733
 734 static void client_common_put_super(struct super_block *sb)
 735 {
 736         struct ll_sb_info *sbi = ll_s2sbi(sb);
 737         ENTRY;
 738
 739 #ifdef CONFIG_FS_POSIX_ACL
 740         if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
 741                 et_fini(&sbi->ll_et);
 742                 rct_fini(&sbi->ll_rct);
 743         }
 744 #endif
 745
 746         cl_sb_fini(sb);
 747
 748         list_del(&sbi->ll_conn_chain);
 749
 750         obd_fid_fini(sbi->ll_dt_exp->exp_obd);
 751         obd_disconnect(sbi->ll_dt_exp);
 752         sbi->ll_dt_exp = NULL;
 753
 754         lprocfs_unregister_mountpoint(sbi);
 755
 756         obd_fid_fini(sbi->ll_md_exp->exp_obd);
 757         obd_disconnect(sbi->ll_md_exp);
 758         sbi->ll_md_exp = NULL;
 759
 760         EXIT;
 761 }
 762
 763 void ll_kill_super(struct super_block *sb)
 764 {
 765         struct ll_sb_info *sbi;
 766         ENTRY;
 767
 768         /* not init sb ?*/
 769         if (!(sb->s_flags & MS_ACTIVE))
 770                 return;
 771
 772         sbi = ll_s2sbi(sb);
 773         /* we need restore s_dev from changed for clustred NFS before put_super
 774          * because new kernels have cached s_dev and change sb->s_dev in
 775          * put_super not affected real removing devices */
 776         if (sbi) {
 777                 sb->s_dev = sbi->ll_sdev_orig;
 778                 sbi->ll_umounting = 1;
 779
 780                 /* wait running statahead threads to quit */
 781                 while (atomic_read(&sbi->ll_sa_running) > 0) {
 782                         set_current_state(TASK_UNINTERRUPTIBLE);
 783                         schedule_timeout(msecs_to_jiffies(MSEC_PER_SEC >> 3));
 784                 }
 785         }
 786
 787         EXIT;
 788 }
 789
 790 static inline int ll_set_opt(const char *opt, char *data, int fl)
 791 {
 792         if (strncmp(opt, data, strlen(opt)) != 0)
 793                 return(0);
 794         else
 795                 return(fl);
 796 }
 797
 798 /* non-client-specific mount options are parsed in lmd_parse */
 799 static int ll_options(char *options, int *flags)
 800 {
 801         int tmp;
 802         char *s1 = options, *s2;
 803         ENTRY;
 804
 805         if (!options)
 806                 RETURN(0);
 807
 808         CDEBUG(D_CONFIG, "Parsing opts %s\n", options);
 809
 810         while (*s1) {
 811                 CDEBUG(D_SUPER, "next opt=%s\n", s1);
 812                 tmp = ll_set_opt("nolock", s1, LL_SBI_NOLCK);
 813                 if (tmp) {
 814                         *flags |= tmp;
 815                         goto next;
 816                 }
 817                 tmp = ll_set_opt("flock", s1, LL_SBI_FLOCK);
 818                 if (tmp) {
 819                         *flags |= tmp;
 820                         goto next;
 821                 }
 822                 tmp = ll_set_opt("localflock", s1, LL_SBI_LOCALFLOCK);
 823                 if (tmp) {
 824                         *flags |= tmp;
 825                         goto next;
 826                 }
 827                 tmp = ll_set_opt("noflock", s1, LL_SBI_FLOCK|LL_SBI_LOCALFLOCK);
 828                 if (tmp) {
 829                         *flags &= ~tmp;
 830                         goto next;
 831                 }
 832                 tmp = ll_set_opt("user_xattr", s1, LL_SBI_USER_XATTR);
 833                 if (tmp) {
 834                         *flags |= tmp;
 835                         goto next;
 836                 }
 837                 tmp = ll_set_opt("nouser_xattr", s1, LL_SBI_USER_XATTR);
 838                 if (tmp) {
 839                         *flags &= ~tmp;
 840                         goto next;
 841                 }
 842                 tmp = ll_set_opt("context", s1, 1);
 843                 if (tmp)
 844                         goto next;
 845                 tmp = ll_set_opt("fscontext", s1, 1);
 846                 if (tmp)
 847                         goto next;
 848                 tmp = ll_set_opt("defcontext", s1, 1);
 849                 if (tmp)
 850                         goto next;
 851                 tmp = ll_set_opt("rootcontext", s1, 1);
 852                 if (tmp)
 853                         goto next;
 854                 tmp = ll_set_opt("remote_client", s1, LL_SBI_RMT_CLIENT);
 855                 if (tmp) {
 856                         *flags |= tmp;
 857                         goto next;
 858                 }
 859                 tmp = ll_set_opt("user_fid2path", s1, LL_SBI_USER_FID2PATH);
 860                 if (tmp) {
 861                         *flags |= tmp;
 862                         goto next;
 863                 }
 864                 tmp = ll_set_opt("nouser_fid2path", s1, LL_SBI_USER_FID2PATH);
 865                 if (tmp) {
 866                         *flags &= ~tmp;
 867                         goto next;
 868                 }
 869
 870                 tmp = ll_set_opt("checksum", s1, LL_SBI_CHECKSUM);
 871                 if (tmp) {
 872                         *flags |= tmp;
 873                         goto next;
 874                 }
 875                 tmp = ll_set_opt("nochecksum", s1, LL_SBI_CHECKSUM);
 876                 if (tmp) {
 877                         *flags &= ~tmp;
 878                         goto next;
 879                 }
 880                 tmp = ll_set_opt("lruresize", s1, LL_SBI_LRU_RESIZE);
 881                 if (tmp) {
 882                         *flags |= tmp;
 883                         goto next;
 884                 }
 885                 tmp = ll_set_opt("nolruresize", s1, LL_SBI_LRU_RESIZE);
 886                 if (tmp) {
 887                         *flags &= ~tmp;
 888                         goto next;
 889                 }
 890                 tmp = ll_set_opt("lazystatfs", s1, LL_SBI_LAZYSTATFS);
 891                 if (tmp) {
 892                         *flags |= tmp;
 893                         goto next;
 894                 }
 895                 tmp = ll_set_opt("nolazystatfs", s1, LL_SBI_LAZYSTATFS);
 896                 if (tmp) {
 897                         *flags &= ~tmp;
 898                         goto next;
 899                 }
 900                 tmp = ll_set_opt("32bitapi", s1, LL_SBI_32BIT_API);
 901                 if (tmp) {
 902                         *flags |= tmp;
 903                         goto next;
 904                 }
 905                 tmp = ll_set_opt("verbose", s1, LL_SBI_VERBOSE);
 906                 if (tmp) {
 907                         *flags |= tmp;
 908                         goto next;
 909                 }
 910                 tmp = ll_set_opt("noverbose", s1, LL_SBI_VERBOSE);
 911                 if (tmp) {
 912                         *flags &= ~tmp;
 913                         goto next;
 914                 }
 915                 tmp = ll_set_opt("always_ping", s1, LL_SBI_ALWAYS_PING);
 916                 if (tmp) {
 917                         *flags |= tmp;
 918                         goto next;
 919                 }
 920                 LCONSOLE_ERROR_MSG(0x152, "Unknown option '%s', won't mount.\n",
 921                                    s1);
 922                 RETURN(-EINVAL);
 923
 924 next:
 925                 /* Find next opt */
 926                 s2 = strchr(s1, ',');
 927                 if (s2 == NULL)
 928                         break;
 929                 s1 = s2 + 1;
 930         }
 931         RETURN(0);
 932 }
 933
 934 void ll_lli_init(struct ll_inode_info *lli)
 935 {
 936         lli->lli_inode_magic = LLI_INODE_MAGIC;
 937         lli->lli_flags = 0;
 938         spin_lock_init(&lli->lli_lock);
 939         lli->lli_posix_acl = NULL;
 940         lli->lli_remote_perms = NULL;
 941         mutex_init(&lli->lli_rmtperm_mutex);
 942         /* Do not set lli_fid, it has been initialized already. */
 943         fid_zero(&lli->lli_pfid);
 944         atomic_set(&lli->lli_open_count, 0);
 945         lli->lli_rmtperm_time = 0;
 946         lli->lli_mds_read_och = NULL;
 947         lli->lli_mds_write_och = NULL;
 948         lli->lli_mds_exec_och = NULL;
 949         lli->lli_open_fd_read_count = 0;
 950         lli->lli_open_fd_write_count = 0;
 951         lli->lli_open_fd_exec_count = 0;
 952         mutex_init(&lli->lli_och_mutex);
 953         spin_lock_init(&lli->lli_agl_lock);
 954         spin_lock_init(&lli->lli_layout_lock);
 955         ll_layout_version_set(lli, CL_LAYOUT_GEN_NONE);
 956         lli->lli_clob = NULL;
 957
 958         init_rwsem(&lli->lli_xattrs_list_rwsem);
 959         mutex_init(&lli->lli_xattrs_enq_lock);
 960
 961         LASSERT(lli->lli_vfs_inode.i_mode != 0);
 962         if (S_ISDIR(lli->lli_vfs_inode.i_mode)) {
 963                 mutex_init(&lli->lli_readdir_mutex);
 964                 lli->lli_opendir_key = NULL;
 965                 lli->lli_sai = NULL;
 966                 spin_lock_init(&lli->lli_sa_lock);
 967                 lli->lli_opendir_pid = 0;
 968                 lli->lli_sa_enabled = 0;
 969                 lli->lli_def_stripe_offset = -1;
 970         } else {
 971                 mutex_init(&lli->lli_size_mutex);
 972                 lli->lli_symlink_name = NULL;
 973                 init_rwsem(&lli->lli_trunc_sem);
 974                 range_lock_tree_init(&lli->lli_write_tree);
 975                 init_rwsem(&lli->lli_glimpse_sem);
 976                 lli->lli_glimpse_time = 0;
 977                 INIT_LIST_HEAD(&lli->lli_agl_list);
 978                 lli->lli_agl_index = 0;
 979                 lli->lli_async_rc = 0;
 980         }
 981         mutex_init(&lli->lli_layout_mutex);
 982 }
 983
 984 static inline int ll_bdi_register(struct backing_dev_info *bdi)
 985 {
 986         static atomic_t ll_bdi_num = ATOMIC_INIT(0);
 987
 988         bdi->name = "lustre";
 989         return bdi_register(bdi, NULL, "lustre-%d",
 990                             atomic_inc_return(&ll_bdi_num));
 991 }
 992
 993 int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
 994 {
 995         struct lustre_profile *lprof = NULL;
 996         struct lustre_sb_info *lsi = s2lsi(sb);
 997         struct ll_sb_info *sbi;
 998         char  *dt = NULL, *md = NULL;
 999         char  *profilenm = get_profile_name(sb);
1000         struct config_llog_instance *cfg;
1001         /* %p for void* in printf needs 16+2 characters: 0xffffffffffffffff */
1002         const int instlen = sizeof(cfg->cfg_instance) * 2 + 2;
1003         int    err;
1004         ENTRY;
1005
1006         CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);
1007
1008         OBD_ALLOC_PTR(cfg);
1009         if (cfg == NULL)
1010                 RETURN(-ENOMEM);
1011
1012         try_module_get(THIS_MODULE);
1013
1014         /* client additional sb info */
1015         lsi->lsi_llsbi = sbi = ll_init_sbi();
1016         if (!sbi) {
1017                 module_put(THIS_MODULE);
1018                 OBD_FREE_PTR(cfg);
1019                 RETURN(-ENOMEM);
1020         }
1021
1022         err = ll_options(lsi->lsi_lmd->lmd_opts, &sbi->ll_flags);
1023         if (err)
1024                 GOTO(out_free, err);
1025
1026         err = bdi_init(&lsi->lsi_bdi);
1027         if (err)
1028                 GOTO(out_free, err);
1029         lsi->lsi_flags |= LSI_BDI_INITIALIZED;
1030 #ifdef HAVE_BDI_CAP_MAP_COPY
1031         lsi->lsi_bdi.capabilities = BDI_CAP_MAP_COPY;
1032 #else
1033         lsi->lsi_bdi.capabilities = 0;
1034 #endif
1035         err = ll_bdi_register(&lsi->lsi_bdi);
1036         if (err)
1037                 GOTO(out_free, err);
1038
1039         sb->s_bdi = &lsi->lsi_bdi;
1040 #ifndef HAVE_DCACHE_LOCK
1041         /* kernel >= 2.6.38 store dentry operations in sb->s_d_op. */
1042         sb->s_d_op = &ll_d_ops;
1043 #endif
1044
1045         /* Generate a string unique to this super, in case some joker tries
1046            to mount the same fs at two mount points.
1047            Use the address of the super itself.*/
1048         cfg->cfg_instance = sb;
1049         cfg->cfg_uuid = lsi->lsi_llsbi->ll_sb_uuid;
1050         cfg->cfg_callback = class_config_llog_handler;
1051         /* set up client obds */
1052         err = lustre_process_log(sb, profilenm, cfg);
1053         if (err < 0)
1054                 GOTO(out_free, err);
1055
1056         /* Profile set with LCFG_MOUNTOPT so we can find our mdc and osc obds */
1057         lprof = class_get_profile(profilenm);
1058         if (lprof == NULL) {
1059                 LCONSOLE_ERROR_MSG(0x156, "The client profile '%s' could not be"
1060                                    " read from the MGS.  Does that filesystem "
1061                                    "exist?\n", profilenm);
1062                 GOTO(out_free, err = -EINVAL);
1063         }
1064         CDEBUG(D_CONFIG, "Found profile %s: mdc=%s osc=%s\n", profilenm,
1065                lprof->lp_md, lprof->lp_dt);
1066
1067         OBD_ALLOC(dt, strlen(lprof->lp_dt) + instlen + 2);
1068         if (!dt)
1069                 GOTO(out_free, err = -ENOMEM);
1070         sprintf(dt, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
1071
1072         OBD_ALLOC(md, strlen(lprof->lp_md) + instlen + 2);
1073         if (!md)
1074                 GOTO(out_free, err = -ENOMEM);
1075         sprintf(md, "%s-%p", lprof->lp_md, cfg->cfg_instance);
1076
1077         /* connections, registrations, sb setup */
1078         err = client_common_fill_super(sb, md, dt, mnt);
1079         if (err < 0)
1080                 GOTO(out_free, err);
1081
1082         sbi->ll_client_common_fill_super_succeeded = 1;
1083
1084 out_free:
1085         if (md)
1086                 OBD_FREE(md, strlen(lprof->lp_md) + instlen + 2);
1087         if (dt)
1088                 OBD_FREE(dt, strlen(lprof->lp_dt) + instlen + 2);
1089         if (lprof != NULL)
1090                 class_put_profile(lprof);
1091         if (err)
1092                 ll_put_super(sb);
1093         else if (sbi->ll_flags & LL_SBI_VERBOSE)
1094                 LCONSOLE_WARN("Mounted %s\n", profilenm);
1095
1096         OBD_FREE_PTR(cfg);
1097         RETURN(err);
1098 } /* ll_fill_super */
1099
1100 void ll_put_super(struct super_block *sb)
1101 {
1102         struct config_llog_instance cfg, params_cfg;
1103         struct obd_device *obd;
1104         struct lustre_sb_info *lsi = s2lsi(sb);
1105         struct ll_sb_info *sbi = ll_s2sbi(sb);
1106         char *profilenm = get_profile_name(sb);
1107         long ccc_count;
1108         int next, force = 1, rc = 0;
1109         ENTRY;
1110
1111         CDEBUG(D_VFSTRACE, "VFS Op: sb %p - %s\n", sb, profilenm);
1112
1113         cfg.cfg_instance = sb;
1114         lustre_end_log(sb, profilenm, &cfg);
1115
1116         params_cfg.cfg_instance = sb;
1117         lustre_end_log(sb, PARAMS_FILENAME, &params_cfg);
1118
1119         if (sbi->ll_md_exp) {
1120                 obd = class_exp2obd(sbi->ll_md_exp);
1121                 if (obd)
1122                         force = obd->obd_force;
1123         }
1124
1125         /* Wait for unstable pages to be committed to stable storage */
1126         if (force == 0) {
1127                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1128                 rc = l_wait_event(sbi->ll_cache->ccc_unstable_waitq,
1129                         atomic_long_read(&sbi->ll_cache->ccc_unstable_nr) == 0,
1130                         &lwi);
1131         }
1132
1133         ccc_count = atomic_long_read(&sbi->ll_cache->ccc_unstable_nr);
1134         if (force == 0 && rc != -EINTR)
1135                 LASSERTF(ccc_count == 0, "count: %li\n", ccc_count);
1136
1137
1138         /* We need to set force before the lov_disconnect in
1139            lustre_common_put_super, since l_d cleans up osc's as well. */
1140         if (force) {
1141                 next = 0;
1142                 while ((obd = class_devices_in_group(&sbi->ll_sb_uuid,
1143                                                      &next)) != NULL) {
1144                         obd->obd_force = force;
1145                 }
1146         }
1147
1148         if (sbi->ll_client_common_fill_super_succeeded) {
1149                 /* Only if client_common_fill_super succeeded */
1150                 client_common_put_super(sb);
1151         }
1152
1153         next = 0;
1154         while ((obd = class_devices_in_group(&sbi->ll_sb_uuid, &next)) !=NULL) {
1155                 class_manual_cleanup(obd);
1156         }
1157
1158         if (sbi->ll_flags & LL_SBI_VERBOSE)
1159                 LCONSOLE_WARN("Unmounted %s\n", profilenm ? profilenm : "");
1160
1161         if (profilenm)
1162                 class_del_profile(profilenm);
1163
1164         if (lsi->lsi_flags & LSI_BDI_INITIALIZED) {
1165                 bdi_destroy(&lsi->lsi_bdi);
1166                 lsi->lsi_flags &= ~LSI_BDI_INITIALIZED;
1167         }
1168
1169         ll_free_sbi(sb);
1170         lsi->lsi_llsbi = NULL;
1171
1172         lustre_common_put_super(sb);
1173
1174         cl_env_cache_purge(~0);
1175
1176         module_put(THIS_MODULE);
1177
1178         EXIT;
1179 } /* client_put_super */
1180
1181 struct inode *ll_inode_from_resource_lock(struct ldlm_lock *lock)
1182 {
1183         struct inode *inode = NULL;
1184
1185         /* NOTE: we depend on atomic igrab() -bzzz */
1186         lock_res_and_lock(lock);
1187         if (lock->l_resource->lr_lvb_inode) {
1188                 struct ll_inode_info * lli;
1189                 lli = ll_i2info(lock->l_resource->lr_lvb_inode);
1190                 if (lli->lli_inode_magic == LLI_INODE_MAGIC) {
1191                         inode = igrab(lock->l_resource->lr_lvb_inode);
1192                 } else {
1193                         inode = lock->l_resource->lr_lvb_inode;
1194                         LDLM_DEBUG_LIMIT(inode->i_state & I_FREEING ?  D_INFO :
1195                                          D_WARNING, lock, "lr_lvb_inode %p is "
1196                                          "bogus: magic %08x",
1197                                          lock->l_resource->lr_lvb_inode,
1198                                          lli->lli_inode_magic);
1199                         inode = NULL;
1200                 }
1201         }
1202         unlock_res_and_lock(lock);
1203         return inode;
1204 }
1205
1206 void ll_dir_clear_lsm_md(struct inode *inode)
1207 {
1208         struct ll_inode_info *lli = ll_i2info(inode);
1209
1210         LASSERT(S_ISDIR(inode->i_mode));
1211
1212         if (lli->lli_lsm_md != NULL) {
1213                 lmv_free_memmd(lli->lli_lsm_md);
1214                 lli->lli_lsm_md = NULL;
1215         }
1216 }
1217
1218 static struct inode *ll_iget_anon_dir(struct super_block *sb,
1219                                       const struct lu_fid *fid,
1220                                       struct lustre_md *md)
1221 {
1222         struct ll_sb_info       *sbi = ll_s2sbi(sb);
1223         struct mdt_body         *body = md->body;
1224         struct inode            *inode;
1225         ino_t                   ino;
1226         ENTRY;
1227
1228         ino = cl_fid_build_ino(fid, sbi->ll_flags & LL_SBI_32BIT_API);
1229         inode = iget_locked(sb, ino);
1230         if (inode == NULL) {
1231                 CERROR("%s: failed get simple inode "DFID": rc = -ENOENT\n",
1232                        ll_get_fsname(sb, NULL, 0), PFID(fid));
1233                 RETURN(ERR_PTR(-ENOENT));
1234         }
1235
1236         if (inode->i_state & I_NEW) {
1237                 struct ll_inode_info *lli = ll_i2info(inode);
1238                 struct lmv_stripe_md *lsm = md->lmv;
1239
1240                 inode->i_mode = (inode->i_mode & ~S_IFMT) |
1241                                 (body->mbo_mode & S_IFMT);
1242                 LASSERTF(S_ISDIR(inode->i_mode), "Not slave inode "DFID"\n",
1243                          PFID(fid));
1244
1245                 LTIME_S(inode->i_mtime) = 0;
1246                 LTIME_S(inode->i_atime) = 0;
1247                 LTIME_S(inode->i_ctime) = 0;
1248                 inode->i_rdev = 0;
1249
1250 #ifdef HAVE_BACKING_DEV_INFO
1251                 /* initializing backing dev info. */
1252                 inode->i_mapping->backing_dev_info =
1253                                                 &s2lsi(inode->i_sb)->lsi_bdi;
1254 #endif
1255                 inode->i_op = &ll_dir_inode_operations;
1256                 inode->i_fop = &ll_dir_operations;
1257                 lli->lli_fid = *fid;
1258                 ll_lli_init(lli);
1259
1260                 LASSERT(lsm != NULL);
1261                 /* master object FID */
1262                 lli->lli_pfid = body->mbo_fid1;
1263                 CDEBUG(D_INODE, "lli %p slave "DFID" master "DFID"\n",
1264                        lli, PFID(fid), PFID(&lli->lli_pfid));
1265                 unlock_new_inode(inode);
1266         }
1267
1268         RETURN(inode);
1269 }
1270
1271 static int ll_init_lsm_md(struct inode *inode, struct lustre_md *md)
1272 {
1273         struct lu_fid *fid;
1274         struct lmv_stripe_md *lsm = md->lmv;
1275         int i;
1276
1277         LASSERT(lsm != NULL);
1278         /* XXX sigh, this lsm_root initialization should be in
1279          * LMV layer, but it needs ll_iget right now, so we
1280          * put this here right now. */
1281         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1282                 fid = &lsm->lsm_md_oinfo[i].lmo_fid;
1283                 LASSERT(lsm->lsm_md_oinfo[i].lmo_root == NULL);
1284                 /* Unfortunately ll_iget will call ll_update_inode,
1285                  * where the initialization of slave inode is slightly
1286                  * different, so it reset lsm_md to NULL to avoid
1287                  * initializing lsm for slave inode. */
1288                 /* For migrating inode, master stripe and master object will
1289                  * be same, so we only need assign this inode */
1290                 if (lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION && i == 0)
1291                         lsm->lsm_md_oinfo[i].lmo_root = inode;
1292                 else
1293                         lsm->lsm_md_oinfo[i].lmo_root =
1294                                 ll_iget_anon_dir(inode->i_sb, fid, md);
1295
1296                 if (IS_ERR(lsm->lsm_md_oinfo[i].lmo_root)) {
1297                         int rc = PTR_ERR(lsm->lsm_md_oinfo[i].lmo_root);
1298
1299                         lsm->lsm_md_oinfo[i].lmo_root = NULL;
1300                         return rc;
1301                 }
1302         }
1303
1304         return 0;
1305 }
1306
1307 static inline int lli_lsm_md_eq(const struct lmv_stripe_md *lsm_md1,
1308                                 const struct lmv_stripe_md *lsm_md2)
1309 {
1310         return lsm_md1->lsm_md_magic == lsm_md2->lsm_md_magic &&
1311                lsm_md1->lsm_md_stripe_count == lsm_md2->lsm_md_stripe_count &&
1312                lsm_md1->lsm_md_master_mdt_index ==
1313                                         lsm_md2->lsm_md_master_mdt_index &&
1314                lsm_md1->lsm_md_hash_type == lsm_md2->lsm_md_hash_type &&
1315                lsm_md1->lsm_md_layout_version ==
1316                                         lsm_md2->lsm_md_layout_version &&
1317                strcmp(lsm_md1->lsm_md_pool_name,
1318                       lsm_md2->lsm_md_pool_name) == 0;
1319 }
1320
1321 static int ll_update_lsm_md(struct inode *inode, struct lustre_md *md)
1322 {
1323         struct ll_inode_info *lli = ll_i2info(inode);
1324         struct lmv_stripe_md *lsm = md->lmv;
1325         int     rc;
1326         ENTRY;
1327
1328         LASSERT(S_ISDIR(inode->i_mode));
1329         CDEBUG(D_INODE, "update lsm %p of "DFID"\n", lli->lli_lsm_md,
1330                PFID(ll_inode2fid(inode)));
1331
1332         /* no striped information from request. */
1333         if (lsm == NULL) {
1334                 if (lli->lli_lsm_md == NULL) {
1335                         RETURN(0);
1336                 } else if (lli->lli_lsm_md->lsm_md_hash_type &
1337                                                 LMV_HASH_FLAG_MIGRATION) {
1338                         /* migration is done, the temporay MIGRATE layout has
1339                          * been removed */
1340                         CDEBUG(D_INODE, DFID" finish migration.\n",
1341                                PFID(ll_inode2fid(inode)));
1342                         lmv_free_memmd(lli->lli_lsm_md);
1343                         lli->lli_lsm_md = NULL;
1344                         RETURN(0);
1345                 } else {
1346                         /* The lustre_md from req does not include stripeEA,
1347                          * see ll_md_setattr */
1348                         RETURN(0);
1349                 }
1350         }
1351
1352         /* set the directory layout */
1353         if (lli->lli_lsm_md == NULL) {
1354                 struct cl_attr  *attr;
1355
1356                 rc = ll_init_lsm_md(inode, md);
1357                 if (rc != 0)
1358                         RETURN(rc);
1359
1360                 /* set md->lmv to NULL, so the following free lustre_md
1361                  * will not free this lsm */
1362                 md->lmv = NULL;
1363                 lli->lli_lsm_md = lsm;
1364
1365                 OBD_ALLOC_PTR(attr);
1366                 if (attr == NULL)
1367                         RETURN(-ENOMEM);
1368
1369                 /* validate the lsm */
1370                 rc = md_merge_attr(ll_i2mdexp(inode), lsm, attr,
1371                                    ll_md_blocking_ast);
1372                 if (rc != 0) {
1373                         OBD_FREE_PTR(attr);
1374                         RETURN(rc);
1375                 }
1376
1377                 if (md->body->mbo_valid & OBD_MD_FLNLINK)
1378                         md->body->mbo_nlink = attr->cat_nlink;
1379                 if (md->body->mbo_valid & OBD_MD_FLSIZE)
1380                         md->body->mbo_size = attr->cat_size;
1381                 if (md->body->mbo_valid & OBD_MD_FLATIME)
1382                         md->body->mbo_atime = attr->cat_atime;
1383                 if (md->body->mbo_valid & OBD_MD_FLCTIME)
1384                         md->body->mbo_ctime = attr->cat_ctime;
1385                 if (md->body->mbo_valid & OBD_MD_FLMTIME)
1386                         md->body->mbo_mtime = attr->cat_mtime;
1387
1388                 OBD_FREE_PTR(attr);
1389
1390                 CDEBUG(D_INODE, "Set lsm %p magic %x to "DFID"\n", lsm,
1391                        lsm->lsm_md_magic, PFID(ll_inode2fid(inode)));
1392                 RETURN(0);
1393         }
1394
1395         /* Compare the old and new stripe information */
1396         if (!lsm_md_eq(lli->lli_lsm_md, lsm)) {
1397                 struct lmv_stripe_md    *old_lsm = lli->lli_lsm_md;
1398                 int                     idx;
1399
1400                 CERROR("%s: inode "DFID"(%p)'s lmv layout mismatch (%p)/(%p)"
1401                        "magic:0x%x/0x%x stripe count: %d/%d master_mdt: %d/%d"
1402                        "hash_type:0x%x/0x%x layout: 0x%x/0x%x pool:%s/%s\n",
1403                        ll_get_fsname(inode->i_sb, NULL, 0), PFID(&lli->lli_fid),
1404                        inode, lsm, old_lsm,
1405                        lsm->lsm_md_magic, old_lsm->lsm_md_magic,
1406                        lsm->lsm_md_stripe_count,
1407                        old_lsm->lsm_md_stripe_count,
1408                        lsm->lsm_md_master_mdt_index,
1409                        old_lsm->lsm_md_master_mdt_index,
1410                        lsm->lsm_md_hash_type, old_lsm->lsm_md_hash_type,
1411                        lsm->lsm_md_layout_version,
1412                        old_lsm->lsm_md_layout_version,
1413                        lsm->lsm_md_pool_name,
1414                        old_lsm->lsm_md_pool_name);
1415
1416                 for (idx = 0; idx < old_lsm->lsm_md_stripe_count; idx++) {
1417                         CERROR("%s: sub FIDs in old lsm idx %d, old: "DFID"\n",
1418                                ll_get_fsname(inode->i_sb, NULL, 0), idx,
1419                                PFID(&old_lsm->lsm_md_oinfo[idx].lmo_fid));
1420                 }
1421
1422                 for (idx = 0; idx < lsm->lsm_md_stripe_count; idx++) {
1423                         CERROR("%s: sub FIDs in new lsm idx %d, new: "DFID"\n",
1424                                ll_get_fsname(inode->i_sb, NULL, 0), idx,
1425                                PFID(&lsm->lsm_md_oinfo[idx].lmo_fid));
1426                 }
1427
1428                 RETURN(-EIO);
1429         }
1430
1431         RETURN(0);
1432 }
1433
1434 void ll_clear_inode(struct inode *inode)
1435 {
1436         struct ll_inode_info *lli = ll_i2info(inode);
1437         struct ll_sb_info *sbi = ll_i2sbi(inode);
1438         ENTRY;
1439
1440         CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
1441                PFID(ll_inode2fid(inode)), inode);
1442
1443         if (S_ISDIR(inode->i_mode)) {
1444                 /* these should have been cleared in ll_file_release */
1445                 LASSERT(lli->lli_opendir_key == NULL);
1446                 LASSERT(lli->lli_sai == NULL);
1447                 LASSERT(lli->lli_opendir_pid == 0);
1448         }
1449
1450         md_null_inode(sbi->ll_md_exp, ll_inode2fid(inode));
1451
1452         LASSERT(!lli->lli_open_fd_write_count);
1453         LASSERT(!lli->lli_open_fd_read_count);
1454         LASSERT(!lli->lli_open_fd_exec_count);
1455
1456         if (lli->lli_mds_write_och)
1457                 ll_md_real_close(inode, FMODE_WRITE);
1458         if (lli->lli_mds_exec_och)
1459                 ll_md_real_close(inode, FMODE_EXEC);
1460         if (lli->lli_mds_read_och)
1461                 ll_md_real_close(inode, FMODE_READ);
1462
1463         if (S_ISLNK(inode->i_mode) && lli->lli_symlink_name) {
1464                 OBD_FREE(lli->lli_symlink_name,
1465                          strlen(lli->lli_symlink_name) + 1);
1466                 lli->lli_symlink_name = NULL;
1467         }
1468
1469         ll_xattr_cache_destroy(inode);
1470
1471         if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
1472                 LASSERT(lli->lli_posix_acl == NULL);
1473                 if (lli->lli_remote_perms) {
1474                         free_rmtperm_hash(lli->lli_remote_perms);
1475                         lli->lli_remote_perms = NULL;
1476                 }
1477         }
1478 #ifdef CONFIG_FS_POSIX_ACL
1479         else if (lli->lli_posix_acl) {
1480                 LASSERT(atomic_read(&lli->lli_posix_acl->a_refcount) == 1);
1481                 LASSERT(lli->lli_remote_perms == NULL);
1482                 posix_acl_release(lli->lli_posix_acl);
1483                 lli->lli_posix_acl = NULL;
1484         }
1485 #endif
1486         lli->lli_inode_magic = LLI_INODE_DEAD;
1487
1488         if (S_ISDIR(inode->i_mode))
1489                 ll_dir_clear_lsm_md(inode);
1490         else if (S_ISREG(inode->i_mode) && !is_bad_inode(inode))
1491                 LASSERT(list_empty(&lli->lli_agl_list));
1492
1493         /*
1494          * XXX This has to be done before lsm is freed below, because
1495          * cl_object still uses inode lsm.
1496          */
1497         cl_inode_fini(inode);
1498
1499         EXIT;
1500 }
1501
1502 static int ll_md_setattr(struct dentry *dentry, struct md_op_data *op_data)
1503 {
1504         struct lustre_md md;
1505         struct inode *inode = dentry->d_inode;
1506         struct ll_sb_info *sbi = ll_i2sbi(inode);
1507         struct ptlrpc_request *request = NULL;
1508         int rc, ia_valid;
1509         ENTRY;
1510
1511         op_data = ll_prep_md_op_data(op_data, inode, NULL, NULL, 0, 0,
1512                                      LUSTRE_OPC_ANY, NULL);
1513         if (IS_ERR(op_data))
1514                 RETURN(PTR_ERR(op_data));
1515
1516         rc = md_setattr(sbi->ll_md_exp, op_data, NULL, 0, &request);
1517         if (rc) {
1518                 ptlrpc_req_finished(request);
1519                 if (rc == -ENOENT) {
1520                         clear_nlink(inode);
1521                         /* Unlinked special device node? Or just a race?
1522                          * Pretend we done everything. */
1523                         if (!S_ISREG(inode->i_mode) &&
1524                             !S_ISDIR(inode->i_mode)) {
1525                                 ia_valid = op_data->op_attr.ia_valid;
1526                                 op_data->op_attr.ia_valid &= ~TIMES_SET_FLAGS;
1527                                 rc = simple_setattr(dentry, &op_data->op_attr);
1528                                 op_data->op_attr.ia_valid = ia_valid;
1529                         }
1530                 } else if (rc != -EPERM && rc != -EACCES && rc != -ETXTBSY) {
1531                         CERROR("md_setattr fails: rc = %d\n", rc);
1532                 }
1533                 RETURN(rc);
1534         }
1535
1536         rc = md_get_lustre_md(sbi->ll_md_exp, request, sbi->ll_dt_exp,
1537                               sbi->ll_md_exp, &md);
1538         if (rc) {
1539                 ptlrpc_req_finished(request);
1540                 RETURN(rc);
1541         }
1542
1543         ia_valid = op_data->op_attr.ia_valid;
1544         /* inode size will be in ll_setattr_ost, can't do it now since dirty
1545          * cache is not cleared yet. */
1546         op_data->op_attr.ia_valid &= ~(TIMES_SET_FLAGS | ATTR_SIZE);
1547         if (S_ISREG(inode->i_mode))
1548                 mutex_lock(&inode->i_mutex);
1549         rc = simple_setattr(dentry, &op_data->op_attr);
1550         if (S_ISREG(inode->i_mode))
1551                 mutex_unlock(&inode->i_mutex);
1552         op_data->op_attr.ia_valid = ia_valid;
1553
1554         rc = ll_update_inode(inode, &md);
1555         ptlrpc_req_finished(request);
1556
1557         RETURN(rc);
1558 }
1559
1560 /* If this inode has objects allocated to it (lsm != NULL), then the OST
1561  * object(s) determine the file size and mtime.  Otherwise, the MDS will
1562  * keep these values until such a time that objects are allocated for it.
1563  * We do the MDS operations first, as it is checking permissions for us.
1564  * We don't to the MDS RPC if there is nothing that we want to store there,
1565  * otherwise there is no harm in updating mtime/atime on the MDS if we are
1566  * going to do an RPC anyways.
1567  *
1568  * If we are doing a truncate, we will send the mtime and ctime updates
1569  * to the OST with the punch RPC, otherwise we do an explicit setattr RPC.
1570  * I don't believe it is possible to get e.g. ATTR_MTIME_SET and ATTR_SIZE
1571  * at the same time.
1572  *
1573  * In case of HSMimport, we only set attr on MDS.
1574  */
1575 int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import)
1576 {
1577         struct inode *inode = dentry->d_inode;
1578         struct ll_inode_info *lli = ll_i2info(inode);
1579         struct md_op_data *op_data = NULL;
1580         int rc = 0;
1581         ENTRY;
1582
1583         CDEBUG(D_VFSTRACE, "%s: setattr inode "DFID"(%p) from %llu to %llu, "
1584                "valid %x, hsm_import %d\n",
1585                ll_get_fsname(inode->i_sb, NULL, 0), PFID(&lli->lli_fid),
1586                inode, i_size_read(inode), attr->ia_size, attr->ia_valid,
1587                hsm_import);
1588
1589         if (attr->ia_valid & ATTR_SIZE) {
1590                 /* Check new size against VFS/VM file size limit and rlimit */
1591                 rc = inode_newsize_ok(inode, attr->ia_size);
1592                 if (rc)
1593                         RETURN(rc);
1594
1595                 /* The maximum Lustre file size is variable, based on the
1596                  * OST maximum object size and number of stripes.  This
1597                  * needs another check in addition to the VFS check above. */
1598                 if (attr->ia_size > ll_file_maxbytes(inode)) {
1599                         CDEBUG(D_INODE,"file "DFID" too large %llu > "LPU64"\n",
1600                                PFID(&lli->lli_fid), attr->ia_size,
1601                                ll_file_maxbytes(inode));
1602                         RETURN(-EFBIG);
1603                 }
1604
1605                 attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
1606         }
1607
1608         /* POSIX: check before ATTR_*TIME_SET set (from inode_change_ok) */
1609         if (attr->ia_valid & TIMES_SET_FLAGS) {
1610                 if ((!uid_eq(current_fsuid(), inode->i_uid)) &&
1611                     !cfs_capable(CFS_CAP_FOWNER))
1612                         RETURN(-EPERM);
1613         }
1614
1615         /* We mark all of the fields "set" so MDS/OST does not re-set them */
1616         if (!(attr->ia_valid & ATTR_CTIME_SET) &&
1617             (attr->ia_valid & ATTR_CTIME)) {
1618                 attr->ia_ctime = CURRENT_TIME;
1619                 attr->ia_valid |= ATTR_CTIME_SET;
1620         }
1621         if (!(attr->ia_valid & ATTR_ATIME_SET) &&
1622             (attr->ia_valid & ATTR_ATIME)) {
1623                 attr->ia_atime = CURRENT_TIME;
1624                 attr->ia_valid |= ATTR_ATIME_SET;
1625         }
1626         if (!(attr->ia_valid & ATTR_MTIME_SET) &&
1627             (attr->ia_valid & ATTR_MTIME)) {
1628                 attr->ia_mtime = CURRENT_TIME;
1629                 attr->ia_valid |= ATTR_MTIME_SET;
1630         }
1631
1632         if (attr->ia_valid & (ATTR_MTIME | ATTR_CTIME))
1633                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu, now = %lu\n",
1634                        LTIME_S(attr->ia_mtime), LTIME_S(attr->ia_ctime),
1635                        cfs_time_current_sec());
1636
1637         if (S_ISREG(inode->i_mode)) {
1638                 if (attr->ia_valid & ATTR_SIZE)
1639                         inode_dio_write_done(inode);
1640                 mutex_unlock(&inode->i_mutex);
1641         }
1642
1643         /* We always do an MDS RPC, even if we're only changing the size;
1644          * only the MDS knows whether truncate() should fail with -ETXTBUSY */
1645
1646         OBD_ALLOC_PTR(op_data);
1647         if (op_data == NULL)
1648                 GOTO(out, rc = -ENOMEM);
1649
1650         if (!hsm_import && attr->ia_valid & ATTR_SIZE) {
1651                 /* If we are changing file size, file content is
1652                  * modified, flag it. */
1653                 attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
1654                 op_data->op_bias |= MDS_DATA_MODIFIED;
1655                 ll_file_clear_flag(lli, LLIF_DATA_MODIFIED);
1656         }
1657
1658         op_data->op_attr = *attr;
1659
1660         rc = ll_md_setattr(dentry, op_data);
1661         if (rc)
1662                 GOTO(out, rc);
1663
1664         if (!S_ISREG(inode->i_mode) || hsm_import)
1665                 GOTO(out, rc = 0);
1666
1667         if (attr->ia_valid & (ATTR_SIZE |
1668                               ATTR_ATIME | ATTR_ATIME_SET |
1669                               ATTR_MTIME | ATTR_MTIME_SET |
1670                               ATTR_CTIME | ATTR_CTIME_SET)) {
1671                 /* For truncate and utimes sending attributes to OSTs, setting
1672                  * mtime/atime to the past will be performed under PW [0:EOF]
1673                  * extent lock (new_size:EOF for truncate).  It may seem
1674                  * excessive to send mtime/atime updates to OSTs when not
1675                  * setting times to past, but it is necessary due to possible
1676                  * time de-synchronization between MDT inode and OST objects */
1677                 rc = cl_setattr_ost(lli->lli_clob, attr, 0);
1678         }
1679
1680         /* If the file was restored, it needs to set dirty flag.
1681          *
1682          * We've already sent MDS_DATA_MODIFIED flag in
1683          * ll_md_setattr() for truncate. However, the MDT refuses to
1684          * set the HS_DIRTY flag on released files, so we have to set
1685          * it again if the file has been restored. Please check how
1686          * LLIF_DATA_MODIFIED is set in vvp_io_setattr_fini().
1687          *
1688          * Please notice that if the file is not released, the previous
1689          * MDS_DATA_MODIFIED has taken effect and usually
1690          * LLIF_DATA_MODIFIED is not set(see vvp_io_setattr_fini()).
1691          * This way we can save an RPC for common open + trunc
1692          * operation. */
1693         if (ll_file_test_and_clear_flag(lli, LLIF_DATA_MODIFIED)) {
1694                 struct hsm_state_set hss = {
1695                         .hss_valid = HSS_SETMASK,
1696                         .hss_setmask = HS_DIRTY,
1697                 };
1698                 int rc2;
1699
1700                 rc2 = ll_hsm_state_set(inode, &hss);
1701                 /* truncate and write can happen at the same time, so that
1702                  * the file can be set modified even though the file is not
1703                  * restored from released state, and ll_hsm_state_set() is
1704                  * not applicable for the file, and rc2 < 0 is normal in this
1705                  * case. */
1706                 if (rc2 < 0)
1707                         CDEBUG(D_INFO, DFID "HSM set dirty failed: rc2 = %d\n",
1708                                PFID(ll_inode2fid(inode)), rc2);
1709         }
1710
1711         EXIT;
1712 out:
1713         if (op_data != NULL)
1714                 ll_finish_md_op_data(op_data);
1715
1716         if (S_ISREG(inode->i_mode)) {
1717                 mutex_lock(&inode->i_mutex);
1718                 if ((attr->ia_valid & ATTR_SIZE) && !hsm_import)
1719                         inode_dio_wait(inode);
1720         }
1721
1722         ll_stats_ops_tally(ll_i2sbi(inode), (attr->ia_valid & ATTR_SIZE) ?
1723                         LPROC_LL_TRUNC : LPROC_LL_SETATTR, 1);
1724
1725         return rc;
1726 }
1727
1728 int ll_setattr(struct dentry *de, struct iattr *attr)
1729 {
1730         int mode = de->d_inode->i_mode;
1731
1732         if ((attr->ia_valid & (ATTR_CTIME|ATTR_SIZE|ATTR_MODE)) ==
1733                               (ATTR_CTIME|ATTR_SIZE|ATTR_MODE))
1734                 attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
1735
1736         if (((attr->ia_valid & (ATTR_MODE|ATTR_FORCE|ATTR_SIZE)) ==
1737                                (ATTR_SIZE|ATTR_MODE)) &&
1738             (((mode & S_ISUID) && !(attr->ia_mode & S_ISUID)) ||
1739              (((mode & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP)) &&
1740               !(attr->ia_mode & S_ISGID))))
1741                 attr->ia_valid |= ATTR_FORCE;
1742
1743         if ((attr->ia_valid & ATTR_MODE) &&
1744             (mode & S_ISUID) &&
1745             !(attr->ia_mode & S_ISUID) &&
1746             !(attr->ia_valid & ATTR_KILL_SUID))
1747                 attr->ia_valid |= ATTR_KILL_SUID;
1748
1749         if ((attr->ia_valid & ATTR_MODE) &&
1750             ((mode & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP)) &&
1751             !(attr->ia_mode & S_ISGID) &&
1752             !(attr->ia_valid & ATTR_KILL_SGID))
1753                 attr->ia_valid |= ATTR_KILL_SGID;
1754
1755         return ll_setattr_raw(de, attr, false);
1756 }
1757
1758 int ll_statfs_internal(struct super_block *sb, struct obd_statfs *osfs,
1759                        __u64 max_age, __u32 flags)
1760 {
1761         struct ll_sb_info *sbi = ll_s2sbi(sb);
1762         struct obd_statfs obd_osfs;
1763         int rc;
1764         ENTRY;
1765
1766         rc = obd_statfs(NULL, sbi->ll_md_exp, osfs, max_age, flags);
1767         if (rc) {
1768                 CERROR("md_statfs fails: rc = %d\n", rc);
1769                 RETURN(rc);
1770         }
1771
1772         osfs->os_type = sb->s_magic;
1773
1774         CDEBUG(D_SUPER, "MDC blocks "LPU64"/"LPU64" objects "LPU64"/"LPU64"\n",
1775                osfs->os_bavail, osfs->os_blocks, osfs->os_ffree,osfs->os_files);
1776
1777         if (sbi->ll_flags & LL_SBI_LAZYSTATFS)
1778                 flags |= OBD_STATFS_NODELAY;
1779
1780         rc = obd_statfs_rqset(sbi->ll_dt_exp, &obd_osfs, max_age, flags);
1781         if (rc) {
1782                 CERROR("obd_statfs fails: rc = %d\n", rc);
1783                 RETURN(rc);
1784         }
1785
1786         CDEBUG(D_SUPER, "OSC blocks "LPU64"/"LPU64" objects "LPU64"/"LPU64"\n",
1787                obd_osfs.os_bavail, obd_osfs.os_blocks, obd_osfs.os_ffree,
1788                obd_osfs.os_files);
1789
1790         osfs->os_bsize = obd_osfs.os_bsize;
1791         osfs->os_blocks = obd_osfs.os_blocks;
1792         osfs->os_bfree = obd_osfs.os_bfree;
1793         osfs->os_bavail = obd_osfs.os_bavail;
1794
1795         /* If we don't have as many objects free on the OST as inodes
1796          * on the MDS, we reduce the total number of inodes to
1797          * compensate, so that the "inodes in use" number is correct.
1798          */
1799         if (obd_osfs.os_ffree < osfs->os_ffree) {
1800                 osfs->os_files = (osfs->os_files - osfs->os_ffree) +
1801                         obd_osfs.os_ffree;
1802                 osfs->os_ffree = obd_osfs.os_ffree;
1803         }
1804
1805         RETURN(rc);
1806 }
1807 int ll_statfs(struct dentry *de, struct kstatfs *sfs)
1808 {
1809         struct super_block *sb = de->d_sb;
1810         struct obd_statfs osfs;
1811         __u64 fsid = huge_encode_dev(sb->s_dev);
1812         int rc;
1813
1814         CDEBUG(D_VFSTRACE, "VFS Op: at "LPU64" jiffies\n", get_jiffies_64());
1815         ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_STAFS, 1);
1816
1817         /* Some amount of caching on the client is allowed */
1818         rc = ll_statfs_internal(sb, &osfs,
1819                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1820                                 0);
1821         if (rc)
1822                 return rc;
1823
1824         statfs_unpack(sfs, &osfs);
1825
1826         /* We need to downshift for all 32-bit kernels, because we can't
1827          * tell if the kernel is being called via sys_statfs64() or not.
1828          * Stop before overflowing f_bsize - in which case it is better
1829          * to just risk EOVERFLOW if caller is using old sys_statfs(). */
1830         if (sizeof(long) < 8) {
1831                 while (osfs.os_blocks > ~0UL && sfs->f_bsize < 0x40000000) {
1832                         sfs->f_bsize <<= 1;
1833
1834                         osfs.os_blocks >>= 1;
1835                         osfs.os_bfree >>= 1;
1836                         osfs.os_bavail >>= 1;
1837                 }
1838         }
1839
1840         sfs->f_blocks = osfs.os_blocks;
1841         sfs->f_bfree = osfs.os_bfree;
1842         sfs->f_bavail = osfs.os_bavail;
1843         sfs->f_fsid.val[0] = (__u32)fsid;
1844         sfs->f_fsid.val[1] = (__u32)(fsid >> 32);
1845         return 0;
1846 }
1847
1848 void ll_inode_size_lock(struct inode *inode)
1849 {
1850         struct ll_inode_info *lli;
1851
1852         LASSERT(!S_ISDIR(inode->i_mode));
1853
1854         lli = ll_i2info(inode);
1855         mutex_lock(&lli->lli_size_mutex);
1856 }
1857
1858 void ll_inode_size_unlock(struct inode *inode)
1859 {
1860         struct ll_inode_info *lli;
1861
1862         lli = ll_i2info(inode);
1863         mutex_unlock(&lli->lli_size_mutex);
1864 }
1865
1866 int ll_update_inode(struct inode *inode, struct lustre_md *md)
1867 {
1868         struct ll_inode_info *lli = ll_i2info(inode);
1869         struct mdt_body *body = md->body;
1870         struct ll_sb_info *sbi = ll_i2sbi(inode);
1871
1872         if (body->mbo_valid & OBD_MD_FLEASIZE)
1873                 cl_file_inode_init(inode, md);
1874
1875         if (S_ISDIR(inode->i_mode)) {
1876                 int     rc;
1877
1878                 rc = ll_update_lsm_md(inode, md);
1879                 if (rc != 0)
1880                         return rc;
1881         }
1882
1883         if (sbi->ll_flags & LL_SBI_RMT_CLIENT) {
1884                 if (body->mbo_valid & OBD_MD_FLRMTPERM)
1885                         ll_update_remote_perm(inode, md->remote_perm);
1886         }
1887 #ifdef CONFIG_FS_POSIX_ACL
1888         else if (body->mbo_valid & OBD_MD_FLACL) {
1889                 spin_lock(&lli->lli_lock);
1890                 if (lli->lli_posix_acl)
1891                         posix_acl_release(lli->lli_posix_acl);
1892                 lli->lli_posix_acl = md->posix_acl;
1893                 spin_unlock(&lli->lli_lock);
1894         }
1895 #endif
1896         inode->i_ino = cl_fid_build_ino(&body->mbo_fid1,
1897                                         sbi->ll_flags & LL_SBI_32BIT_API);
1898         inode->i_generation = cl_fid_build_gen(&body->mbo_fid1);
1899
1900         if (body->mbo_valid & OBD_MD_FLATIME) {
1901                 if (body->mbo_atime > LTIME_S(inode->i_atime))
1902                         LTIME_S(inode->i_atime) = body->mbo_atime;
1903                 lli->lli_atime = body->mbo_atime;
1904         }
1905
1906         if (body->mbo_valid & OBD_MD_FLMTIME) {
1907                 if (body->mbo_mtime > LTIME_S(inode->i_mtime)) {
1908                         CDEBUG(D_INODE, "setting ino %lu mtime from %lu "
1909                                "to "LPU64"\n", inode->i_ino,
1910                                LTIME_S(inode->i_mtime), body->mbo_mtime);
1911                         LTIME_S(inode->i_mtime) = body->mbo_mtime;
1912                 }
1913                 lli->lli_mtime = body->mbo_mtime;
1914         }
1915
1916         if (body->mbo_valid & OBD_MD_FLCTIME) {
1917                 if (body->mbo_ctime > LTIME_S(inode->i_ctime))
1918                         LTIME_S(inode->i_ctime) = body->mbo_ctime;
1919                 lli->lli_ctime = body->mbo_ctime;
1920         }
1921
1922         if (body->mbo_valid & OBD_MD_FLMODE)
1923                 inode->i_mode = (inode->i_mode & S_IFMT) |
1924                                 (body->mbo_mode & ~S_IFMT);
1925
1926         if (body->mbo_valid & OBD_MD_FLTYPE)
1927                 inode->i_mode = (inode->i_mode & ~S_IFMT) |
1928                                 (body->mbo_mode & S_IFMT);
1929
1930         LASSERT(inode->i_mode != 0);
1931         if (S_ISREG(inode->i_mode))
1932                 inode->i_blkbits = min(PTLRPC_MAX_BRW_BITS + 1,
1933                                        LL_MAX_BLKSIZE_BITS);
1934         else
1935                 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
1936
1937         if (body->mbo_valid & OBD_MD_FLUID)
1938                 inode->i_uid = make_kuid(&init_user_ns, body->mbo_uid);
1939         if (body->mbo_valid & OBD_MD_FLGID)
1940                 inode->i_gid = make_kgid(&init_user_ns, body->mbo_gid);
1941         if (body->mbo_valid & OBD_MD_FLFLAGS)
1942                 inode->i_flags = ll_ext_to_inode_flags(body->mbo_flags);
1943         if (body->mbo_valid & OBD_MD_FLNLINK)
1944                 set_nlink(inode, body->mbo_nlink);
1945         if (body->mbo_valid & OBD_MD_FLRDEV)
1946                 inode->i_rdev = old_decode_dev(body->mbo_rdev);
1947
1948         if (body->mbo_valid & OBD_MD_FLID) {
1949                 /* FID shouldn't be changed! */
1950                 if (fid_is_sane(&lli->lli_fid)) {
1951                         LASSERTF(lu_fid_eq(&lli->lli_fid, &body->mbo_fid1),
1952                                  "Trying to change FID "DFID
1953                                  " to the "DFID", inode "DFID"(%p)\n",
1954                                  PFID(&lli->lli_fid), PFID(&body->mbo_fid1),
1955                                  PFID(ll_inode2fid(inode)), inode);
1956                 } else {
1957                         lli->lli_fid = body->mbo_fid1;
1958                 }
1959         }
1960
1961         LASSERT(fid_seq(&lli->lli_fid) != 0);
1962
1963         if (body->mbo_valid & OBD_MD_FLSIZE) {
1964                 i_size_write(inode, body->mbo_size);
1965
1966                 CDEBUG(D_VFSTRACE, "inode="DFID", updating i_size %llu\n",
1967                        PFID(ll_inode2fid(inode)),
1968                        (unsigned long long)body->mbo_size);
1969
1970                 if (body->mbo_valid & OBD_MD_FLBLOCKS)
1971                         inode->i_blocks = body->mbo_blocks;
1972         }
1973
1974         if (body->mbo_valid & OBD_MD_TSTATE) {
1975                 /* Set LLIF_FILE_RESTORING if restore ongoing and
1976                  * clear it when done to ensure to start again
1977                  * glimpsing updated attrs
1978                  */
1979                 if (body->mbo_t_state & MS_RESTORE)
1980                         ll_file_set_flag(lli, LLIF_FILE_RESTORING);
1981                 else
1982                         ll_file_clear_flag(lli, LLIF_FILE_RESTORING);
1983         }
1984
1985         return 0;
1986 }
1987
1988 int ll_read_inode2(struct inode *inode, void *opaque)
1989 {
1990         struct lustre_md *md = opaque;
1991         struct ll_inode_info *lli = ll_i2info(inode);
1992         int     rc;
1993         ENTRY;
1994
1995         CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
1996                PFID(&lli->lli_fid), inode);
1997
1998         /* Core attributes from the MDS first.  This is a new inode, and
1999          * the VFS doesn't zero times in the core inode so we have to do
2000          * it ourselves.  They will be overwritten by either MDS or OST
2001          * attributes - we just need to make sure they aren't newer. */
2002         LTIME_S(inode->i_mtime) = 0;
2003         LTIME_S(inode->i_atime) = 0;
2004         LTIME_S(inode->i_ctime) = 0;
2005         inode->i_rdev = 0;
2006         rc = ll_update_inode(inode, md);
2007         if (rc != 0)
2008                 RETURN(rc);
2009
2010         /* OIDEBUG(inode); */
2011
2012 #ifdef HAVE_BACKING_DEV_INFO
2013         /* initializing backing dev info. */
2014         inode->i_mapping->backing_dev_info = &s2lsi(inode->i_sb)->lsi_bdi;
2015 #endif
2016         if (S_ISREG(inode->i_mode)) {
2017                 struct ll_sb_info *sbi = ll_i2sbi(inode);
2018                 inode->i_op = &ll_file_inode_operations;
2019                 inode->i_fop = sbi->ll_fop;
2020                 inode->i_mapping->a_ops = (struct address_space_operations *)&ll_aops;
2021                 EXIT;
2022         } else if (S_ISDIR(inode->i_mode)) {
2023                 inode->i_op = &ll_dir_inode_operations;
2024                 inode->i_fop = &ll_dir_operations;
2025                 EXIT;
2026         } else if (S_ISLNK(inode->i_mode)) {
2027                 inode->i_op = &ll_fast_symlink_inode_operations;
2028                 EXIT;
2029         } else {
2030                 inode->i_op = &ll_special_inode_operations;
2031
2032                 init_special_inode(inode, inode->i_mode,
2033                                    inode->i_rdev);
2034
2035                 EXIT;
2036         }
2037
2038         return 0;
2039 }
2040
2041 void ll_delete_inode(struct inode *inode)
2042 {
2043         struct ll_inode_info *lli = ll_i2info(inode);
2044         ENTRY;
2045
2046         if (S_ISREG(inode->i_mode) && lli->lli_clob != NULL)
2047                 /* It is last chance to write out dirty pages,
2048                  * otherwise we may lose data while umount */
2049                 cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, CL_FSYNC_LOCAL, 1);
2050
2051         truncate_inode_pages_final(&inode->i_data);
2052
2053         LASSERTF(inode->i_data.nrpages == 0, "inode="DFID"(%p) nrpages=%lu, "
2054                  "see https://jira.hpdd.intel.com/browse/LU-118\n",
2055                  PFID(ll_inode2fid(inode)), inode, inode->i_data.nrpages);
2056
2057 #ifdef HAVE_SBOPS_EVICT_INODE
2058         ll_clear_inode(inode);
2059 #endif
2060         clear_inode(inode);
2061
2062         EXIT;
2063 }
2064
2065 int ll_iocontrol(struct inode *inode, struct file *file,
2066                  unsigned int cmd, unsigned long arg)
2067 {
2068         struct ll_sb_info *sbi = ll_i2sbi(inode);
2069         struct ptlrpc_request *req = NULL;
2070         int rc, flags = 0;
2071         ENTRY;
2072
2073         switch(cmd) {
2074         case FSFILT_IOC_GETFLAGS: {
2075                 struct mdt_body *body;
2076                 struct md_op_data *op_data;
2077
2078                 op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL,
2079                                              0, 0, LUSTRE_OPC_ANY,
2080                                              NULL);
2081                 if (IS_ERR(op_data))
2082                         RETURN(PTR_ERR(op_data));
2083
2084                 op_data->op_valid = OBD_MD_FLFLAGS;
2085                 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
2086                 ll_finish_md_op_data(op_data);
2087                 if (rc) {
2088                         CERROR("%s: failure inode "DFID": rc = %d\n",
2089                                sbi->ll_md_exp->exp_obd->obd_name,
2090                                PFID(ll_inode2fid(inode)), rc);
2091                         RETURN(-abs(rc));
2092                 }
2093
2094                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
2095
2096                 flags = body->mbo_flags;
2097
2098                 ptlrpc_req_finished(req);
2099
2100                 RETURN(put_user(flags, (int __user *)arg));
2101         }
2102         case FSFILT_IOC_SETFLAGS: {
2103                 struct iattr *attr;
2104                 struct md_op_data *op_data;
2105                 struct cl_object *obj;
2106
2107                 if (get_user(flags, (int __user *)arg))
2108                         RETURN(-EFAULT);
2109
2110                 op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
2111                                              LUSTRE_OPC_ANY, NULL);
2112                 if (IS_ERR(op_data))
2113                         RETURN(PTR_ERR(op_data));
2114
2115                 op_data->op_attr_flags = flags;
2116                 op_data->op_attr.ia_valid |= ATTR_ATTR_FLAG;
2117                 rc = md_setattr(sbi->ll_md_exp, op_data, NULL, 0, &req);
2118                 ll_finish_md_op_data(op_data);
2119                 ptlrpc_req_finished(req);
2120                 if (rc)
2121                         RETURN(rc);
2122
2123                 inode->i_flags = ll_ext_to_inode_flags(flags);
2124
2125                 obj = ll_i2info(inode)->lli_clob;
2126                 if (obj == NULL)
2127                         RETURN(0);
2128
2129                 OBD_ALLOC_PTR(attr);
2130                 if (attr == NULL)
2131                         RETURN(-ENOMEM);
2132
2133                 attr->ia_valid = ATTR_ATTR_FLAG;
2134                 rc = cl_setattr_ost(obj, attr, flags);
2135
2136                 OBD_FREE_PTR(attr);
2137                 RETURN(rc);
2138         }
2139         default:
2140                 RETURN(-ENOSYS);
2141         }
2142
2143         RETURN(0);
2144 }
2145
2146 int ll_flush_ctx(struct inode *inode)
2147 {
2148         struct ll_sb_info  *sbi = ll_i2sbi(inode);
2149
2150         CDEBUG(D_SEC, "flush context for user %d\n",
2151                from_kuid(&init_user_ns, current_uid()));
2152
2153         obd_set_info_async(NULL, sbi->ll_md_exp,
2154                            sizeof(KEY_FLUSH_CTX), KEY_FLUSH_CTX,
2155                            0, NULL, NULL);
2156         obd_set_info_async(NULL, sbi->ll_dt_exp,
2157                            sizeof(KEY_FLUSH_CTX), KEY_FLUSH_CTX,
2158                            0, NULL, NULL);
2159         return 0;
2160 }
2161
2162 /* umount -f client means force down, don't save state */
2163 void ll_umount_begin(struct super_block *sb)
2164 {
2165         struct ll_sb_info *sbi = ll_s2sbi(sb);
2166         struct obd_device *obd;
2167         struct obd_ioctl_data *ioc_data;
2168         ENTRY;
2169
2170         CDEBUG(D_VFSTRACE, "VFS Op: superblock %p count %d active %d\n", sb,
2171                sb->s_count, atomic_read(&sb->s_active));
2172
2173         obd = class_exp2obd(sbi->ll_md_exp);
2174         if (obd == NULL) {
2175                 CERROR("Invalid MDC connection handle "LPX64"\n",
2176                        sbi->ll_md_exp->exp_handle.h_cookie);
2177                 EXIT;
2178                 return;
2179         }
2180         obd->obd_force = 1;
2181
2182         obd = class_exp2obd(sbi->ll_dt_exp);
2183         if (obd == NULL) {
2184                 CERROR("Invalid LOV connection handle "LPX64"\n",
2185                        sbi->ll_dt_exp->exp_handle.h_cookie);
2186                 EXIT;
2187                 return;
2188         }
2189         obd->obd_force = 1;
2190
2191         OBD_ALLOC_PTR(ioc_data);
2192         if (ioc_data) {
2193                 obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_md_exp,
2194                               sizeof *ioc_data, ioc_data, NULL);
2195
2196                 obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_dt_exp,
2197                               sizeof *ioc_data, ioc_data, NULL);
2198
2199                 OBD_FREE_PTR(ioc_data);
2200         }
2201
2202         /* Really, we'd like to wait until there are no requests outstanding,
2203          * and then continue.  For now, we just invalidate the requests,
2204          * schedule() and sleep one second if needed, and hope.
2205          */
2206         schedule();
2207         EXIT;
2208 }
2209
2210 int ll_remount_fs(struct super_block *sb, int *flags, char *data)
2211 {
2212         struct ll_sb_info *sbi = ll_s2sbi(sb);
2213         char *profilenm = get_profile_name(sb);
2214         int err;
2215         __u32 read_only;
2216
2217         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
2218                 read_only = *flags & MS_RDONLY;
2219                 err = obd_set_info_async(NULL, sbi->ll_md_exp,
2220                                          sizeof(KEY_READ_ONLY),
2221                                          KEY_READ_ONLY, sizeof(read_only),
2222                                          &read_only, NULL);
2223                 if (err) {
2224                         LCONSOLE_WARN("Failed to remount %s %s (%d)\n",
2225                                       profilenm, read_only ?
2226                                       "read-only" : "read-write", err);
2227                         return err;
2228                 }
2229
2230                 if (read_only)
2231                         sb->s_flags |= MS_RDONLY;
2232                 else
2233                         sb->s_flags &= ~MS_RDONLY;
2234
2235                 if (sbi->ll_flags & LL_SBI_VERBOSE)
2236                         LCONSOLE_WARN("Remounted %s %s\n", profilenm,
2237                                       read_only ?  "read-only" : "read-write");
2238         }
2239         return 0;
2240 }
2241
2242 /**
2243  * Cleanup the open handle that is cached on MDT-side.
2244  *
2245  * For open case, the client side open handling thread may hit error
2246  * after the MDT grant the open. Under such case, the client should
2247  * send close RPC to the MDT as cleanup; otherwise, the open handle
2248  * on the MDT will be leaked there until the client umount or evicted.
2249  *
2250  * In further, if someone unlinked the file, because the open handle
2251  * holds the reference on such file/object, then it will block the
2252  * subsequent threads that want to locate such object via FID.
2253  *
2254  * \param[in] sb        super block for this file-system
2255  * \param[in] open_req  pointer to the original open request
2256  */
2257 void ll_open_cleanup(struct super_block *sb, struct ptlrpc_request *open_req)
2258 {
2259         struct mdt_body                 *body;
2260         struct md_op_data               *op_data;
2261         struct ptlrpc_request           *close_req = NULL;
2262         struct obd_export               *exp       = ll_s2sbi(sb)->ll_md_exp;
2263         ENTRY;
2264
2265         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
2266         OBD_ALLOC_PTR(op_data);
2267         if (op_data == NULL) {
2268                 CWARN("%s: cannot allocate op_data to release open handle for "
2269                       DFID"\n",
2270                       ll_get_fsname(sb, NULL, 0), PFID(&body->mbo_fid1));
2271
2272                 RETURN_EXIT;
2273         }
2274
2275         op_data->op_fid1 = body->mbo_fid1;
2276         op_data->op_handle = body->mbo_handle;
2277         op_data->op_mod_time = cfs_time_current_sec();
2278         md_close(exp, op_data, NULL, &close_req);
2279         ptlrpc_req_finished(close_req);
2280         ll_finish_md_op_data(op_data);
2281
2282         EXIT;
2283 }
2284
2285 int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
2286                   struct super_block *sb, struct lookup_intent *it)
2287 {
2288         struct ll_sb_info *sbi = NULL;
2289         struct lustre_md md = { NULL };
2290         int rc;
2291         ENTRY;
2292
2293         LASSERT(*inode || sb);
2294         sbi = sb ? ll_s2sbi(sb) : ll_i2sbi(*inode);
2295         rc = md_get_lustre_md(sbi->ll_md_exp, req, sbi->ll_dt_exp,
2296                               sbi->ll_md_exp, &md);
2297         if (rc != 0)
2298                 GOTO(cleanup, rc);
2299
2300         if (*inode) {
2301                 rc = ll_update_inode(*inode, &md);
2302                 if (rc != 0)
2303                         GOTO(out, rc);
2304         } else {
2305                 LASSERT(sb != NULL);
2306
2307                 /*
2308                  * At this point server returns to client's same fid as client
2309                  * generated for creating. So using ->fid1 is okay here.
2310                  */
2311                 if (!fid_is_sane(&md.body->mbo_fid1)) {
2312                         CERROR("%s: Fid is insane "DFID"\n",
2313                                 ll_get_fsname(sb, NULL, 0),
2314                                 PFID(&md.body->mbo_fid1));
2315                         GOTO(out, rc = -EINVAL);
2316                 }
2317
2318                 *inode = ll_iget(sb, cl_fid_build_ino(&md.body->mbo_fid1,
2319                                              sbi->ll_flags & LL_SBI_32BIT_API),
2320                                  &md);
2321                 if (IS_ERR(*inode)) {
2322 #ifdef CONFIG_FS_POSIX_ACL
2323                         if (md.posix_acl) {
2324                                 posix_acl_release(md.posix_acl);
2325                                 md.posix_acl = NULL;
2326                         }
2327 #endif
2328                         rc = IS_ERR(*inode) ? PTR_ERR(*inode) : -ENOMEM;
2329                         *inode = NULL;
2330                         CERROR("new_inode -fatal: rc %d\n", rc);
2331                         GOTO(out, rc);
2332                 }
2333         }
2334
2335         /* Handling piggyback layout lock.
2336          * Layout lock can be piggybacked by getattr and open request.
2337          * The lsm can be applied to inode only if it comes with a layout lock
2338          * otherwise correct layout may be overwritten, for example:
2339          * 1. proc1: mdt returns a lsm but not granting layout
2340          * 2. layout was changed by another client
2341          * 3. proc2: refresh layout and layout lock granted
2342          * 4. proc1: to apply a stale layout */
2343         if (it != NULL && it->it_lock_mode != 0) {
2344                 struct lustre_handle lockh;
2345                 struct ldlm_lock *lock;
2346
2347                 lockh.cookie = it->it_lock_handle;
2348                 lock = ldlm_handle2lock(&lockh);
2349                 LASSERT(lock != NULL);
2350                 if (ldlm_has_layout(lock)) {
2351                         struct cl_object_conf conf;
2352
2353                         memset(&conf, 0, sizeof(conf));
2354                         conf.coc_opc = OBJECT_CONF_SET;
2355                         conf.coc_inode = *inode;
2356                         conf.coc_lock = lock;
2357                         conf.u.coc_layout = md.layout;
2358                         (void)ll_layout_conf(*inode, &conf);
2359                 }
2360                 LDLM_LOCK_PUT(lock);
2361         }
2362
2363         GOTO(out, rc = 0);
2364
2365 out:
2366         md_free_lustre_md(sbi->ll_md_exp, &md);
2367
2368 cleanup:
2369         if (rc != 0 && it != NULL && it->it_op & IT_OPEN)
2370                 ll_open_cleanup(sb != NULL ? sb : (*inode)->i_sb, req);
2371
2372         return rc;
2373 }
2374
2375 int ll_obd_statfs(struct inode *inode, void __user *arg)
2376 {
2377         struct ll_sb_info *sbi = NULL;
2378         struct obd_export *exp;
2379         char *buf = NULL;
2380         struct obd_ioctl_data *data = NULL;
2381         __u32 type;
2382         int len = 0, rc;
2383
2384         if (!inode || !(sbi = ll_i2sbi(inode)))
2385                 GOTO(out_statfs, rc = -EINVAL);
2386
2387         rc = obd_ioctl_getdata(&buf, &len, arg);
2388         if (rc)
2389                 GOTO(out_statfs, rc);
2390
2391         data = (void*)buf;
2392         if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
2393             !data->ioc_pbuf1 || !data->ioc_pbuf2)
2394                 GOTO(out_statfs, rc = -EINVAL);
2395
2396         if (data->ioc_inllen1 != sizeof(__u32) ||
2397             data->ioc_inllen2 != sizeof(__u32) ||
2398             data->ioc_plen1 != sizeof(struct obd_statfs) ||
2399             data->ioc_plen2 != sizeof(struct obd_uuid))
2400                 GOTO(out_statfs, rc = -EINVAL);
2401
2402         memcpy(&type, data->ioc_inlbuf1, sizeof(__u32));
2403         if (type & LL_STATFS_LMV)
2404                 exp = sbi->ll_md_exp;
2405         else if (type & LL_STATFS_LOV)
2406                 exp = sbi->ll_dt_exp;
2407         else
2408                 GOTO(out_statfs, rc = -ENODEV);
2409
2410         rc = obd_iocontrol(IOC_OBD_STATFS, exp, len, buf, NULL);
2411         if (rc)
2412                 GOTO(out_statfs, rc);
2413 out_statfs:
2414         if (buf)
2415                 obd_ioctl_freedata(buf, len);
2416         return rc;
2417 }
2418
2419 int ll_process_config(struct lustre_cfg *lcfg)
2420 {
2421         struct super_block *sb;
2422         unsigned long x;
2423         int rc = 0;
2424         char *ptr;
2425
2426         /* The instance name contains the sb: lustre-client-aacfe000 */
2427         ptr = strrchr(lustre_cfg_string(lcfg, 0), '-');
2428         if (!ptr || !*(++ptr))
2429                 return -EINVAL;
2430         if (sscanf(ptr, "%lx", &x) != 1)
2431                 return -EINVAL;
2432         sb = (struct super_block *)x;
2433         /* This better be a real Lustre superblock! */
2434         LASSERT(s2lsi(sb)->lsi_lmd->lmd_magic == LMD_MAGIC);
2435
2436         /* Note we have not called client_common_fill_super yet, so
2437            proc fns must be able to handle that! */
2438         rc = class_process_proc_param(PARAM_LLITE, lprocfs_llite_obd_vars,
2439                                       lcfg, sb);
2440         if (rc > 0)
2441                 rc = 0;
2442         return rc;
2443 }
2444
2445 /* this function prepares md_op_data hint for passing it down to MD stack. */
2446 struct md_op_data *ll_prep_md_op_data(struct md_op_data *op_data,
2447                                       struct inode *i1, struct inode *i2,
2448                                       const char *name, size_t namelen,
2449                                       __u32 mode, __u32 opc, void *data)
2450 {
2451         LASSERT(i1 != NULL);
2452
2453         if (name == NULL) {
2454                 /* Do not reuse namelen for something else. */
2455                 if (namelen != 0)
2456                         return ERR_PTR(-EINVAL);
2457         } else {
2458                 if (namelen > ll_i2sbi(i1)->ll_namelen)
2459                         return ERR_PTR(-ENAMETOOLONG);
2460
2461                 if (!lu_name_is_valid_2(name, namelen))
2462                         return ERR_PTR(-EINVAL);
2463         }
2464
2465         if (op_data == NULL)
2466                 OBD_ALLOC_PTR(op_data);
2467
2468         if (op_data == NULL)
2469                 return ERR_PTR(-ENOMEM);
2470
2471         ll_i2gids(op_data->op_suppgids, i1, i2);
2472         op_data->op_fid1 = *ll_inode2fid(i1);
2473         op_data->op_default_stripe_offset = -1;
2474         if (S_ISDIR(i1->i_mode)) {
2475                 op_data->op_mea1 = ll_i2info(i1)->lli_lsm_md;
2476                 if (opc == LUSTRE_OPC_MKDIR)
2477                         op_data->op_default_stripe_offset =
2478                                    ll_i2info(i1)->lli_def_stripe_offset;
2479         }
2480
2481         if (i2) {
2482                 op_data->op_fid2 = *ll_inode2fid(i2);
2483                 if (S_ISDIR(i2->i_mode))
2484                         op_data->op_mea2 = ll_i2info(i2)->lli_lsm_md;
2485         } else {
2486                 fid_zero(&op_data->op_fid2);
2487         }
2488
2489         if (ll_i2sbi(i1)->ll_flags & LL_SBI_64BIT_HASH)
2490                 op_data->op_cli_flags |= CLI_HASH64;
2491
2492         if (ll_need_32bit_api(ll_i2sbi(i1)))
2493                 op_data->op_cli_flags |= CLI_API32;
2494
2495         op_data->op_name = name;
2496         op_data->op_namelen = namelen;
2497         op_data->op_mode = mode;
2498         op_data->op_mod_time = cfs_time_current_sec();
2499         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2500         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2501         op_data->op_cap = cfs_curproc_cap_pack();
2502         if ((opc == LUSTRE_OPC_CREATE) && (name != NULL) &&
2503              filename_is_volatile(name, namelen, &op_data->op_mds)) {
2504                 op_data->op_bias |= MDS_CREATE_VOLATILE;
2505         } else {
2506                 op_data->op_mds = 0;
2507         }
2508         op_data->op_data = data;
2509
2510         return op_data;
2511 }
2512
2513 void ll_finish_md_op_data(struct md_op_data *op_data)
2514 {
2515         OBD_FREE_PTR(op_data);
2516 }
2517
2518 #ifdef HAVE_SUPEROPS_USE_DENTRY
2519 int ll_show_options(struct seq_file *seq, struct dentry *dentry)
2520 #else
2521 int ll_show_options(struct seq_file *seq, struct vfsmount *vfs)
2522 #endif
2523 {
2524         struct ll_sb_info *sbi;
2525
2526 #ifdef HAVE_SUPEROPS_USE_DENTRY
2527         LASSERT((seq != NULL) && (dentry != NULL));
2528         sbi = ll_s2sbi(dentry->d_sb);
2529 #else
2530         LASSERT((seq != NULL) && (vfs != NULL));
2531         sbi = ll_s2sbi(vfs->mnt_sb);
2532 #endif
2533
2534         if (sbi->ll_flags & LL_SBI_NOLCK)
2535                 seq_puts(seq, ",nolock");
2536
2537         if (sbi->ll_flags & LL_SBI_FLOCK)
2538                 seq_puts(seq, ",flock");
2539
2540         if (sbi->ll_flags & LL_SBI_LOCALFLOCK)
2541                 seq_puts(seq, ",localflock");
2542
2543         if (sbi->ll_flags & LL_SBI_USER_XATTR)
2544                 seq_puts(seq, ",user_xattr");
2545
2546         if (sbi->ll_flags & LL_SBI_LAZYSTATFS)
2547                 seq_puts(seq, ",lazystatfs");
2548
2549         if (sbi->ll_flags & LL_SBI_USER_FID2PATH)
2550                 seq_puts(seq, ",user_fid2path");
2551
2552         if (sbi->ll_flags & LL_SBI_ALWAYS_PING)
2553                 seq_puts(seq, ",always_ping");
2554
2555         RETURN(0);
2556 }
2557
2558 /**
2559  * Get obd name by cmd, and copy out to user space
2560  */
2561 int ll_get_obd_name(struct inode *inode, unsigned int cmd, unsigned long arg)
2562 {
2563         struct ll_sb_info *sbi = ll_i2sbi(inode);
2564         struct obd_device *obd;
2565         ENTRY;
2566
2567         if (cmd == OBD_IOC_GETDTNAME)
2568                 obd = class_exp2obd(sbi->ll_dt_exp);
2569         else if (cmd == OBD_IOC_GETMDNAME)
2570                 obd = class_exp2obd(sbi->ll_md_exp);
2571         else
2572                 RETURN(-EINVAL);
2573
2574         if (!obd)
2575                 RETURN(-ENOENT);
2576
2577         if (copy_to_user((void __user *)arg, obd->obd_name,
2578                          strlen(obd->obd_name) + 1))
2579                 RETURN(-EFAULT);
2580
2581         RETURN(0);
2582 }
2583
2584 /**
2585  * Get lustre file system name by \a sbi. If \a buf is provided(non-NULL), the
2586  * fsname will be returned in this buffer; otherwise, a static buffer will be
2587  * used to store the fsname and returned to caller.
2588  */
2589 char *ll_get_fsname(struct super_block *sb, char *buf, int buflen)
2590 {
2591         static char fsname_static[MTI_NAME_MAXLEN];
2592         struct lustre_sb_info *lsi = s2lsi(sb);
2593         char *ptr;
2594         int len;
2595
2596         if (buf == NULL) {
2597                 /* this means the caller wants to use static buffer
2598                  * and it doesn't care about race. Usually this is
2599                  * in error reporting path */
2600                 buf = fsname_static;
2601                 buflen = sizeof(fsname_static);
2602         }
2603
2604         len = strlen(lsi->lsi_lmd->lmd_profile);
2605         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
2606         if (ptr && (strcmp(ptr, "-client") == 0))
2607                 len -= 7;
2608
2609         if (unlikely(len >= buflen))
2610                 len = buflen - 1;
2611         strncpy(buf, lsi->lsi_lmd->lmd_profile, len);
2612         buf[len] = '\0';
2613
2614         return buf;
2615 }
2616
2617 static char* ll_d_path(struct dentry *dentry, char *buf, int bufsize)
2618 {
2619         char *path = NULL;
2620
2621         struct path p;
2622
2623         p.dentry = dentry;
2624         p.mnt = current->fs->root.mnt;
2625         path_get(&p);
2626         path = d_path(&p, buf, bufsize);
2627         path_put(&p);
2628         return path;
2629 }
2630
2631 void ll_dirty_page_discard_warn(struct page *page, int ioret)
2632 {
2633         char *buf, *path = NULL;
2634         struct dentry *dentry = NULL;
2635         struct inode *inode = page->mapping->host;
2636
2637         /* this can be called inside spin lock so use GFP_ATOMIC. */
2638         buf = (char *)__get_free_page(GFP_ATOMIC);
2639         if (buf != NULL) {
2640                 dentry = d_find_alias(page->mapping->host);
2641                 if (dentry != NULL)
2642                         path = ll_d_path(dentry, buf, PAGE_SIZE);
2643         }
2644
2645         CDEBUG(D_WARNING,
2646                "%s: dirty page discard: %s/fid: "DFID"/%s may get corrupted "
2647                "(rc %d)\n", ll_get_fsname(page->mapping->host->i_sb, NULL, 0),
2648                s2lsi(page->mapping->host->i_sb)->lsi_lmd->lmd_dev,
2649                PFID(ll_inode2fid(inode)),
2650                (path && !IS_ERR(path)) ? path : "", ioret);
2651
2652         if (dentry != NULL)
2653                 dput(dentry);
2654
2655         if (buf != NULL)
2656                 free_page((unsigned long)buf);
2657 }
2658
2659 ssize_t ll_copy_user_md(const struct lov_user_md __user *md,
2660                         struct lov_user_md **kbuf)
2661 {
2662         struct lov_user_md      lum;
2663         ssize_t                 lum_size;
2664         ENTRY;
2665
2666         if (copy_from_user(&lum, md, sizeof(lum)))
2667                 RETURN(-EFAULT);
2668
2669         lum_size = ll_lov_user_md_size(&lum);
2670         if (lum_size < 0)
2671                 RETURN(lum_size);
2672
2673         OBD_ALLOC(*kbuf, lum_size);
2674         if (*kbuf == NULL)
2675                 RETURN(-ENOMEM);
2676
2677         if (copy_from_user(*kbuf, md, lum_size) != 0) {
2678                 OBD_FREE(*kbuf, lum_size);
2679                 RETURN(-EFAULT);
2680         }
2681
2682         RETURN(lum_size);
2683 }
2684
2685 /*
2686  * Compute llite root squash state after a change of root squash
2687  * configuration setting or add/remove of a lnet nid
2688  */
2689 void ll_compute_rootsquash_state(struct ll_sb_info *sbi)
2690 {
2691         struct root_squash_info *squash = &sbi->ll_squash;
2692         int i;
2693         bool matched;
2694         lnet_process_id_t id;
2695
2696         /* Update norootsquash flag */
2697         down_write(&squash->rsi_sem);
2698         if (list_empty(&squash->rsi_nosquash_nids))
2699                 sbi->ll_flags &= ~LL_SBI_NOROOTSQUASH;
2700         else {
2701                 /* Do not apply root squash as soon as one of our NIDs is
2702                  * in the nosquash_nids list */
2703                 matched = false;
2704                 i = 0;
2705                 while (LNetGetId(i++, &id) != -ENOENT) {
2706                         if (LNET_NETTYP(LNET_NIDNET(id.nid)) == LOLND)
2707                                 continue;
2708                         if (cfs_match_nid(id.nid, &squash->rsi_nosquash_nids)) {
2709                                 matched = true;
2710                                 break;
2711                         }
2712                 }
2713                 if (matched)
2714                         sbi->ll_flags |= LL_SBI_NOROOTSQUASH;
2715                 else
2716                         sbi->ll_flags &= ~LL_SBI_NOROOTSQUASH;
2717         }
2718         up_write(&squash->rsi_sem);
2719 }
2720
2721 /**
2722  * Parse linkea content to extract information about a given hardlink
2723  *
2724  * \param[in]   ldata      - Initialized linkea data
2725  * \param[in]   linkno     - Link identifier
2726  * \param[out]  parent_fid - The entry's parent FID
2727  * \param[out]  ln         - Entry name destination buffer
2728  *
2729  * \retval 0 on success
2730  * \retval Appropriate negative error code on failure
2731  */
2732 static int ll_linkea_decode(struct linkea_data *ldata, unsigned int linkno,
2733                             struct lu_fid *parent_fid, struct lu_name *ln)
2734 {
2735         unsigned int    idx;
2736         int             rc;
2737         ENTRY;
2738
2739         rc = linkea_init(ldata);
2740         if (rc < 0)
2741                 RETURN(rc);
2742
2743         if (linkno >= ldata->ld_leh->leh_reccount)
2744                 /* beyond last link */
2745                 RETURN(-ENODATA);
2746
2747         linkea_first_entry(ldata);
2748         for (idx = 0; ldata->ld_lee != NULL; idx++) {
2749                 linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, ln,
2750                                     parent_fid);
2751                 if (idx == linkno)
2752                         break;
2753
2754                 linkea_next_entry(ldata);
2755         }
2756
2757         if (idx < linkno)
2758                 RETURN(-ENODATA);
2759
2760         RETURN(0);
2761 }
2762
2763 /**
2764  * Get parent FID and name of an identified link. Operation is performed for
2765  * a given link number, letting the caller iterate over linkno to list one or
2766  * all links of an entry.
2767  *
2768  * \param[in]     file - File descriptor against which to perform the operation
2769  * \param[in,out] arg  - User-filled structure containing the linkno to operate
2770  *                       on and the available size. It is eventually filled with
2771  *                       the requested information or left untouched on error
2772  *
2773  * \retval - 0 on success
2774  * \retval - Appropriate negative error code on failure
2775  */
2776 int ll_getparent(struct file *file, struct getparent __user *arg)
2777 {
2778         struct dentry           *dentry = file->f_path.dentry;
2779         struct inode            *inode = dentry->d_inode;
2780         struct linkea_data      *ldata;
2781         struct lu_buf            buf = LU_BUF_NULL;
2782         struct lu_name           ln;
2783         struct lu_fid            parent_fid;
2784         __u32                    linkno;
2785         __u32                    name_size;
2786         int                      rc;
2787
2788         ENTRY;
2789
2790         if (!cfs_capable(CFS_CAP_DAC_READ_SEARCH) &&
2791             !(ll_i2sbi(inode)->ll_flags & LL_SBI_USER_FID2PATH))
2792                 RETURN(-EPERM);
2793
2794         if (get_user(name_size, &arg->gp_name_size))
2795                 RETURN(-EFAULT);
2796
2797         if (get_user(linkno, &arg->gp_linkno))
2798                 RETURN(-EFAULT);
2799
2800         if (name_size > PATH_MAX)
2801                 RETURN(-EINVAL);
2802
2803         OBD_ALLOC(ldata, sizeof(*ldata));
2804         if (ldata == NULL)
2805                 RETURN(-ENOMEM);
2806
2807         rc = linkea_data_new(ldata, &buf);
2808         if (rc < 0)
2809                 GOTO(ldata_free, rc);
2810
2811         rc = ll_getxattr(dentry, XATTR_NAME_LINK, buf.lb_buf, buf.lb_len);
2812         if (rc < 0)
2813                 GOTO(lb_free, rc);
2814
2815         rc = ll_linkea_decode(ldata, linkno, &parent_fid, &ln);
2816         if (rc < 0)
2817                 GOTO(lb_free, rc);
2818
2819         if (ln.ln_namelen >= name_size)
2820                 GOTO(lb_free, rc = -EOVERFLOW);
2821
2822         if (copy_to_user(&arg->gp_fid, &parent_fid, sizeof(arg->gp_fid)))
2823                 GOTO(lb_free, rc = -EFAULT);
2824
2825         if (copy_to_user(&arg->gp_name, ln.ln_name, ln.ln_namelen))
2826                 GOTO(lb_free, rc = -EFAULT);
2827
2828         if (put_user('\0', arg->gp_name + ln.ln_namelen))
2829                 GOTO(lb_free, rc = -EFAULT);
2830
2831 lb_free:
2832         lu_buf_free(&buf);
2833 ldata_free:
2834         OBD_FREE(ldata, sizeof(*ldata));
2835
2836         RETURN(rc);
2837 }