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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/llite/llite_lib.c
  33  *
  34  * Lustre Light Super operations
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LLITE
  38
  39 #include <linux/module.h>
  40 #include <linux/statfs.h>
  41 #include <linux/time.h>
  42 #include <linux/types.h>
  43 #include <linux/version.h>
  44 #include <linux/mm.h>
  45 #include <linux/user_namespace.h>
  46 #ifdef HAVE_UIDGID_HEADER
  47 # include <linux/uidgid.h>
  48 #endif
  49 #include <linux/security.h>
  50
  51 #include <uapi/linux/lustre/lustre_ioctl.h>
  52 #include <lustre_ha.h>
  53 #include <lustre_dlm.h>
  54 #include <lprocfs_status.h>
  55 #include <lustre_disk.h>
  56 #include <uapi/linux/lustre/lustre_param.h>
  57 #include <lustre_log.h>
  58 #include <cl_object.h>
  59 #include <obd_cksum.h>
  60 #include "llite_internal.h"
  61
  62 struct kmem_cache *ll_file_data_slab;
  63
  64 #ifndef log2
  65 #define log2(n) ffz(~(n))
  66 #endif
  67
  68 static struct ll_sb_info *ll_init_sbi(void)
  69 {
  70         struct ll_sb_info *sbi = NULL;
  71         unsigned long pages;
  72         unsigned long lru_page_max;
  73         struct sysinfo si;
  74         class_uuid_t uuid;
  75         int i;
  76         ENTRY;
  77
  78         OBD_ALLOC_PTR(sbi);
  79         if (sbi == NULL)
  80                 RETURN(NULL);
  81
  82         spin_lock_init(&sbi->ll_lock);
  83         mutex_init(&sbi->ll_lco.lco_lock);
  84         spin_lock_init(&sbi->ll_pp_extent_lock);
  85         spin_lock_init(&sbi->ll_process_lock);
  86         sbi->ll_rw_stats_on = 0;
  87
  88         si_meminfo(&si);
  89         pages = si.totalram - si.totalhigh;
  90         lru_page_max = pages / 2;
  91
  92         /* initialize ll_cache data */
  93         sbi->ll_cache = cl_cache_init(lru_page_max);
  94         if (sbi->ll_cache == NULL) {
  95                 OBD_FREE(sbi, sizeof(*sbi));
  96                 RETURN(NULL);
  97         }
  98
  99         sbi->ll_ra_info.ra_max_pages_per_file = min(pages / 32,
 100                                            SBI_DEFAULT_READAHEAD_MAX);
 101         sbi->ll_ra_info.ra_max_pages = sbi->ll_ra_info.ra_max_pages_per_file;
 102         sbi->ll_ra_info.ra_max_read_ahead_whole_pages = -1;
 103
 104         ll_generate_random_uuid(uuid);
 105         class_uuid_unparse(uuid, &sbi->ll_sb_uuid);
 106         CDEBUG(D_CONFIG, "generated uuid: %s\n", sbi->ll_sb_uuid.uuid);
 107
 108         sbi->ll_flags |= LL_SBI_VERBOSE;
 109 #ifdef ENABLE_CHECKSUM
 110         sbi->ll_flags |= LL_SBI_CHECKSUM;
 111 #endif
 112
 113 #ifdef HAVE_LRU_RESIZE_SUPPORT
 114         sbi->ll_flags |= LL_SBI_LRU_RESIZE;
 115 #endif
 116         sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 117
 118         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
 119                 spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
 120                                pp_r_hist.oh_lock);
 121                 spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
 122                                pp_w_hist.oh_lock);
 123         }
 124
 125         /* metadata statahead is enabled by default */
 126         sbi->ll_sa_running_max = LL_SA_RUNNING_DEF;
 127         sbi->ll_sa_max = LL_SA_RPC_DEF;
 128         atomic_set(&sbi->ll_sa_total, 0);
 129         atomic_set(&sbi->ll_sa_wrong, 0);
 130         atomic_set(&sbi->ll_sa_running, 0);
 131         atomic_set(&sbi->ll_agl_total, 0);
 132         sbi->ll_flags |= LL_SBI_AGL_ENABLED;
 133         sbi->ll_flags |= LL_SBI_FAST_READ;
 134         sbi->ll_flags |= LL_SBI_TINY_WRITE;
 135
 136         /* root squash */
 137         sbi->ll_squash.rsi_uid = 0;
 138         sbi->ll_squash.rsi_gid = 0;
 139         INIT_LIST_HEAD(&sbi->ll_squash.rsi_nosquash_nids);
 140         init_rwsem(&sbi->ll_squash.rsi_sem);
 141
 142         RETURN(sbi);
 143 }
 144
 145 static void ll_free_sbi(struct super_block *sb)
 146 {
 147         struct ll_sb_info *sbi = ll_s2sbi(sb);
 148         ENTRY;
 149
 150         if (sbi != NULL) {
 151                 if (!list_empty(&sbi->ll_squash.rsi_nosquash_nids))
 152                         cfs_free_nidlist(&sbi->ll_squash.rsi_nosquash_nids);
 153                 if (sbi->ll_cache != NULL) {
 154                         cl_cache_decref(sbi->ll_cache);
 155                         sbi->ll_cache = NULL;
 156                 }
 157                 OBD_FREE(sbi, sizeof(*sbi));
 158         }
 159         EXIT;
 160 }
 161
 162 static inline int obd_connect_has_secctx(struct obd_connect_data *data)
 163 {
 164         return data->ocd_connect_flags & OBD_CONNECT_FLAGS2 &&
 165                data->ocd_connect_flags2 & OBD_CONNECT2_FILE_SECCTX;
 166 }
 167
 168 static int client_common_fill_super(struct super_block *sb, char *md, char *dt,
 169                                     struct vfsmount *mnt)
 170 {
 171         struct inode *root = NULL;
 172         struct ll_sb_info *sbi = ll_s2sbi(sb);
 173         struct obd_device *obd;
 174         struct obd_statfs *osfs = NULL;
 175         struct ptlrpc_request *request = NULL;
 176         struct obd_connect_data *data = NULL;
 177         struct obd_uuid *uuid;
 178         struct md_op_data *op_data;
 179         struct lustre_md lmd;
 180         u64 valid;
 181         int size, err, checksum;
 182         ENTRY;
 183
 184         obd = class_name2obd(md);
 185         if (!obd) {
 186                 CERROR("MD %s: not setup or attached\n", md);
 187                 RETURN(-EINVAL);
 188         }
 189
 190         OBD_ALLOC_PTR(data);
 191         if (data == NULL)
 192                 RETURN(-ENOMEM);
 193
 194         OBD_ALLOC_PTR(osfs);
 195         if (osfs == NULL) {
 196                 OBD_FREE_PTR(data);
 197                 RETURN(-ENOMEM);
 198         }
 199
 200         /* pass client page size via ocd_grant_blkbits, the server should report
 201          * back its backend blocksize for grant calculation purpose */
 202         data->ocd_grant_blkbits = PAGE_SHIFT;
 203
 204         /* indicate MDT features supported by this client */
 205         data->ocd_connect_flags = OBD_CONNECT_IBITS    | OBD_CONNECT_NODEVOH  |
 206                                   OBD_CONNECT_ATTRFID  | OBD_CONNECT_GRANT |
 207                                   OBD_CONNECT_VERSION  | OBD_CONNECT_BRW_SIZE |
 208                                   OBD_CONNECT_SRVLOCK  | OBD_CONNECT_TRUNCLOCK|
 209                                   OBD_CONNECT_MDS_CAPA | OBD_CONNECT_OSS_CAPA |
 210                                   OBD_CONNECT_CANCELSET | OBD_CONNECT_FID     |
 211                                   OBD_CONNECT_AT       | OBD_CONNECT_LOV_V3   |
 212                                   OBD_CONNECT_VBR | OBD_CONNECT_FULL20 |
 213                                   OBD_CONNECT_64BITHASH |
 214                                   OBD_CONNECT_EINPROGRESS |
 215                                   OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
 216                                   OBD_CONNECT_LAYOUTLOCK | OBD_CONNECT_PINGLESS|
 217                                   OBD_CONNECT_MAX_EASIZE |
 218                                   OBD_CONNECT_FLOCK_DEAD |
 219                                   OBD_CONNECT_DISP_STRIPE | OBD_CONNECT_LFSCK |
 220                                   OBD_CONNECT_OPEN_BY_FID |
 221                                   OBD_CONNECT_DIR_STRIPE |
 222                                   OBD_CONNECT_BULK_MBITS | OBD_CONNECT_CKSUM |
 223                                   OBD_CONNECT_SUBTREE |
 224                                   OBD_CONNECT_MULTIMODRPCS |
 225                                   OBD_CONNECT_GRANT_PARAM |
 226                                   OBD_CONNECT_SHORTIO | OBD_CONNECT_FLAGS2;
 227
 228         data->ocd_connect_flags2 = OBD_CONNECT2_FLR |
 229                                    OBD_CONNECT2_LOCK_CONVERT |
 230                                    OBD_CONNECT2_DIR_MIGRATE;
 231
 232 #ifdef HAVE_LRU_RESIZE_SUPPORT
 233         if (sbi->ll_flags & LL_SBI_LRU_RESIZE)
 234                 data->ocd_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 235 #endif
 236 #ifdef CONFIG_FS_POSIX_ACL
 237         data->ocd_connect_flags |= OBD_CONNECT_ACL | OBD_CONNECT_UMASK |
 238                                    OBD_CONNECT_LARGE_ACL;
 239 #endif
 240
 241         data->ocd_cksum_types = obd_cksum_types_supported_client();
 242
 243         if (OBD_FAIL_CHECK(OBD_FAIL_MDC_LIGHTWEIGHT))
 244                 /* flag mdc connection as lightweight, only used for test
 245                  * purpose, use with care */
 246                 data->ocd_connect_flags |= OBD_CONNECT_LIGHTWEIGHT;
 247
 248         data->ocd_ibits_known = MDS_INODELOCK_FULL;
 249         data->ocd_version = LUSTRE_VERSION_CODE;
 250
 251         if (sb->s_flags & MS_RDONLY)
 252                 data->ocd_connect_flags |= OBD_CONNECT_RDONLY;
 253         if (sbi->ll_flags & LL_SBI_USER_XATTR)
 254                 data->ocd_connect_flags |= OBD_CONNECT_XATTR;
 255
 256 #ifdef MS_NOSEC
 257         /* Setting this indicates we correctly support S_NOSEC (See kernel
 258          * commit 9e1f1de02c2275d7172e18dc4e7c2065777611bf)
 259          */
 260         sb->s_flags |= MS_NOSEC;
 261 #endif
 262
 263         if (sbi->ll_flags & LL_SBI_FLOCK)
 264                 sbi->ll_fop = &ll_file_operations_flock;
 265         else if (sbi->ll_flags & LL_SBI_LOCALFLOCK)
 266                 sbi->ll_fop = &ll_file_operations;
 267         else
 268                 sbi->ll_fop = &ll_file_operations_noflock;
 269
 270         /* always ping even if server suppress_pings */
 271         if (sbi->ll_flags & LL_SBI_ALWAYS_PING)
 272                 data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
 273
 274 #if defined(HAVE_SECURITY_DENTRY_INIT_SECURITY) && defined(CONFIG_SECURITY)
 275         data->ocd_connect_flags2 |= OBD_CONNECT2_FILE_SECCTX;
 276 #endif /* HAVE_SECURITY_DENTRY_INIT_SECURITY */
 277
 278         data->ocd_brw_size = MD_MAX_BRW_SIZE;
 279
 280         err = obd_connect(NULL, &sbi->ll_md_exp, obd, &sbi->ll_sb_uuid, data, NULL);
 281         if (err == -EBUSY) {
 282                 LCONSOLE_ERROR_MSG(0x14f, "An MDT (md %s) is performing "
 283                                    "recovery, of which this client is not a "
 284                                    "part. Please wait for recovery to complete,"
 285                                    " abort, or time out.\n", md);
 286                 GOTO(out, err);
 287         } else if (err) {
 288                 CERROR("cannot connect to %s: rc = %d\n", md, err);
 289                 GOTO(out, err);
 290         }
 291
 292         sbi->ll_md_exp->exp_connect_data = *data;
 293
 294         err = obd_fid_init(sbi->ll_md_exp->exp_obd, sbi->ll_md_exp,
 295                            LUSTRE_SEQ_METADATA);
 296         if (err) {
 297                 CERROR("%s: Can't init metadata layer FID infrastructure, "
 298                        "rc = %d\n", sbi->ll_md_exp->exp_obd->obd_name, err);
 299                 GOTO(out_md, err);
 300         }
 301
 302         /* For mount, we only need fs info from MDT0, and also in DNE, it
 303          * can make sure the client can be mounted as long as MDT0 is
 304          * avaible */
 305         err = obd_statfs(NULL, sbi->ll_md_exp, osfs,
 306                         ktime_get_seconds() -OBD_STATFS_CACHE_SECONDS,
 307                         OBD_STATFS_FOR_MDT0);
 308         if (err)
 309                 GOTO(out_md_fid, err);
 310
 311         /* This needs to be after statfs to ensure connect has finished.
 312          * Note that "data" does NOT contain the valid connect reply.
 313          * If connecting to a 1.8 server there will be no LMV device, so
 314          * we can access the MDC export directly and exp_connect_flags will
 315          * be non-zero, but if accessing an upgraded 2.1 server it will
 316          * have the correct flags filled in.
 317          * XXX: fill in the LMV exp_connect_flags from MDC(s). */
 318         valid = exp_connect_flags(sbi->ll_md_exp) & CLIENT_CONNECT_MDT_REQD;
 319         if (exp_connect_flags(sbi->ll_md_exp) != 0 &&
 320             valid != CLIENT_CONNECT_MDT_REQD) {
 321                 char *buf;
 322
 323                 OBD_ALLOC_WAIT(buf, PAGE_SIZE);
 324                 obd_connect_flags2str(buf, PAGE_SIZE,
 325                                       valid ^ CLIENT_CONNECT_MDT_REQD, 0, ",");
 326                 LCONSOLE_ERROR_MSG(0x170, "Server %s does not support "
 327                                    "feature(s) needed for correct operation "
 328                                    "of this client (%s). Please upgrade "
 329                                    "server or downgrade client.\n",
 330                                    sbi->ll_md_exp->exp_obd->obd_name, buf);
 331                 OBD_FREE(buf, PAGE_SIZE);
 332                 GOTO(out_md_fid, err = -EPROTO);
 333         }
 334
 335         size = sizeof(*data);
 336         err = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_CONN_DATA),
 337                            KEY_CONN_DATA,  &size, data);
 338         if (err) {
 339                 CERROR("%s: Get connect data failed: rc = %d\n",
 340                        sbi->ll_md_exp->exp_obd->obd_name, err);
 341                 GOTO(out_md_fid, err);
 342         }
 343
 344         LASSERT(osfs->os_bsize);
 345         sb->s_blocksize = osfs->os_bsize;
 346         sb->s_blocksize_bits = log2(osfs->os_bsize);
 347         sb->s_magic = LL_SUPER_MAGIC;
 348         sb->s_maxbytes = MAX_LFS_FILESIZE;
 349         sbi->ll_namelen = osfs->os_namelen;
 350         sbi->ll_mnt.mnt = current->fs->root.mnt;
 351
 352         if ((sbi->ll_flags & LL_SBI_USER_XATTR) &&
 353             !(data->ocd_connect_flags & OBD_CONNECT_XATTR)) {
 354                 LCONSOLE_INFO("Disabling user_xattr feature because "
 355                               "it is not supported on the server\n");
 356                 sbi->ll_flags &= ~LL_SBI_USER_XATTR;
 357         }
 358
 359         if (data->ocd_connect_flags & OBD_CONNECT_ACL) {
 360 #ifdef MS_POSIXACL
 361                 sb->s_flags |= MS_POSIXACL;
 362 #endif
 363                 sbi->ll_flags |= LL_SBI_ACL;
 364         } else {
 365                 LCONSOLE_INFO("client wants to enable acl, but mdt not!\n");
 366 #ifdef MS_POSIXACL
 367                 sb->s_flags &= ~MS_POSIXACL;
 368 #endif
 369                 sbi->ll_flags &= ~LL_SBI_ACL;
 370         }
 371
 372         if (data->ocd_connect_flags & OBD_CONNECT_64BITHASH)
 373                 sbi->ll_flags |= LL_SBI_64BIT_HASH;
 374
 375         if (data->ocd_connect_flags & OBD_CONNECT_LAYOUTLOCK)
 376                 sbi->ll_flags |= LL_SBI_LAYOUT_LOCK;
 377
 378         if (obd_connect_has_secctx(data))
 379                 sbi->ll_flags |= LL_SBI_FILE_SECCTX;
 380
 381         if (data->ocd_ibits_known & MDS_INODELOCK_XATTR) {
 382                 if (!(data->ocd_connect_flags & OBD_CONNECT_MAX_EASIZE)) {
 383                         LCONSOLE_INFO("%s: disabling xattr cache due to "
 384                                       "unknown maximum xattr size.\n", dt);
 385                 } else if (!sbi->ll_xattr_cache_set) {
 386                         /* If xattr_cache is already set (no matter 0 or 1)
 387                          * during processing llog, it won't be enabled here. */
 388                         sbi->ll_flags |= LL_SBI_XATTR_CACHE;
 389                         sbi->ll_xattr_cache_enabled = 1;
 390                 }
 391         }
 392
 393         obd = class_name2obd(dt);
 394         if (!obd) {
 395                 CERROR("DT %s: not setup or attached\n", dt);
 396                 GOTO(out_md_fid, err = -ENODEV);
 397         }
 398
 399         /* pass client page size via ocd_grant_blkbits, the server should report
 400          * back its backend blocksize for grant calculation purpose */
 401         data->ocd_grant_blkbits = PAGE_SHIFT;
 402
 403         /* indicate OST features supported by this client */
 404         data->ocd_connect_flags = OBD_CONNECT_GRANT | OBD_CONNECT_VERSION |
 405                                   OBD_CONNECT_REQPORTAL | OBD_CONNECT_BRW_SIZE |
 406                                   OBD_CONNECT_CANCELSET | OBD_CONNECT_FID |
 407                                   OBD_CONNECT_SRVLOCK | OBD_CONNECT_TRUNCLOCK|
 408                                   OBD_CONNECT_AT | OBD_CONNECT_OSS_CAPA |
 409                                   OBD_CONNECT_VBR | OBD_CONNECT_FULL20 |
 410                                   OBD_CONNECT_64BITHASH | OBD_CONNECT_MAXBYTES |
 411                                   OBD_CONNECT_EINPROGRESS |
 412                                   OBD_CONNECT_JOBSTATS | OBD_CONNECT_LVB_TYPE |
 413                                   OBD_CONNECT_LAYOUTLOCK |
 414                                   OBD_CONNECT_PINGLESS | OBD_CONNECT_LFSCK |
 415                                   OBD_CONNECT_BULK_MBITS | OBD_CONNECT_SHORTIO |
 416                                   OBD_CONNECT_FLAGS2 | OBD_CONNECT_GRANT_SHRINK;
 417
 418 /* The client currently advertises support for OBD_CONNECT_LOCKAHEAD_OLD so it
 419  * can interoperate with an older version of lockahead which was released prior
 420  * to landing in master. This support will be dropped when 2.13 development
 421  * starts.  At the point, we should not just drop the connect flag (below), we
 422  * should also remove the support in the code.
 423  *
 424  * Removing it means a few things:
 425  * 1. Remove this section here
 426  * 2. Remove CEF_NONBLOCK in ll_file_lockahead()
 427  * 3. Remove function exp_connect_lockahead_old
 428  * 4. Remove LDLM_FL_LOCKAHEAD_OLD_RESERVED in lustre_dlm_flags.h
 429  * */
 430 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 12, 50, 0)
 431         data->ocd_connect_flags |= OBD_CONNECT_LOCKAHEAD_OLD;
 432 #endif
 433
 434         data->ocd_connect_flags2 = OBD_CONNECT2_LOCKAHEAD;
 435
 436         if (!OBD_FAIL_CHECK(OBD_FAIL_OSC_CONNECT_GRANT_PARAM))
 437                 data->ocd_connect_flags |= OBD_CONNECT_GRANT_PARAM;
 438
 439         /* OBD_CONNECT_CKSUM should always be set, even if checksums are
 440          * disabled by default, because it can still be enabled on the
 441          * fly via /proc. As a consequence, we still need to come to an
 442          * agreement on the supported algorithms at connect time */
 443         data->ocd_connect_flags |= OBD_CONNECT_CKSUM;
 444
 445         if (OBD_FAIL_CHECK(OBD_FAIL_OSC_CKSUM_ADLER_ONLY))
 446                 data->ocd_cksum_types = OBD_CKSUM_ADLER;
 447         else
 448                 data->ocd_cksum_types = obd_cksum_types_supported_client();
 449
 450 #ifdef HAVE_LRU_RESIZE_SUPPORT
 451         data->ocd_connect_flags |= OBD_CONNECT_LRU_RESIZE;
 452 #endif
 453         /* always ping even if server suppress_pings */
 454         if (sbi->ll_flags & LL_SBI_ALWAYS_PING)
 455                 data->ocd_connect_flags &= ~OBD_CONNECT_PINGLESS;
 456
 457         CDEBUG(D_RPCTRACE, "ocd_connect_flags: %#llx ocd_version: %d "
 458                "ocd_grant: %d\n", data->ocd_connect_flags,
 459                data->ocd_version, data->ocd_grant);
 460
 461         obd->obd_upcall.onu_owner = &sbi->ll_lco;
 462         obd->obd_upcall.onu_upcall = cl_ocd_update;
 463
 464         data->ocd_brw_size = DT_MAX_BRW_SIZE;
 465
 466         err = obd_connect(NULL, &sbi->ll_dt_exp, obd, &sbi->ll_sb_uuid, data,
 467                           NULL);
 468         if (err == -EBUSY) {
 469                 LCONSOLE_ERROR_MSG(0x150, "An OST (dt %s) is performing "
 470                                    "recovery, of which this client is not a "
 471                                    "part.  Please wait for recovery to "
 472                                    "complete, abort, or time out.\n", dt);
 473                 GOTO(out_md, err);
 474         } else if (err) {
 475                 CERROR("%s: Cannot connect to %s: rc = %d\n",
 476                        sbi->ll_dt_exp->exp_obd->obd_name, dt, err);
 477                 GOTO(out_md, err);
 478         }
 479
 480         sbi->ll_dt_exp->exp_connect_data = *data;
 481
 482         /* Don't change value if it was specified in the config log */
 483         if (sbi->ll_ra_info.ra_max_read_ahead_whole_pages == -1)
 484                 sbi->ll_ra_info.ra_max_read_ahead_whole_pages =
 485                         max_t(unsigned long, SBI_DEFAULT_READAHEAD_WHOLE_MAX,
 486                               (data->ocd_brw_size >> PAGE_SHIFT));
 487
 488         err = obd_fid_init(sbi->ll_dt_exp->exp_obd, sbi->ll_dt_exp,
 489                            LUSTRE_SEQ_METADATA);
 490         if (err) {
 491                 CERROR("%s: Can't init data layer FID infrastructure, "
 492                        "rc = %d\n", sbi->ll_dt_exp->exp_obd->obd_name, err);
 493                 GOTO(out_dt, err);
 494         }
 495
 496         mutex_lock(&sbi->ll_lco.lco_lock);
 497         sbi->ll_lco.lco_flags = data->ocd_connect_flags;
 498         sbi->ll_lco.lco_md_exp = sbi->ll_md_exp;
 499         sbi->ll_lco.lco_dt_exp = sbi->ll_dt_exp;
 500         mutex_unlock(&sbi->ll_lco.lco_lock);
 501
 502         fid_zero(&sbi->ll_root_fid);
 503         err = md_get_root(sbi->ll_md_exp, get_mount_fileset(sb),
 504                            &sbi->ll_root_fid);
 505         if (err) {
 506                 CERROR("cannot mds_connect: rc = %d\n", err);
 507                 GOTO(out_lock_cn_cb, err);
 508         }
 509         if (!fid_is_sane(&sbi->ll_root_fid)) {
 510                 CERROR("%s: Invalid root fid "DFID" during mount\n",
 511                        sbi->ll_md_exp->exp_obd->obd_name,
 512                        PFID(&sbi->ll_root_fid));
 513                 GOTO(out_lock_cn_cb, err = -EINVAL);
 514         }
 515         CDEBUG(D_SUPER, "rootfid "DFID"\n", PFID(&sbi->ll_root_fid));
 516
 517         sb->s_op = &lustre_super_operations;
 518 #ifdef HAVE_XATTR_HANDLER_FLAGS
 519         sb->s_xattr = ll_xattr_handlers;
 520 #endif
 521 #if THREAD_SIZE >= 8192 /*b=17630*/
 522         sb->s_export_op = &lustre_export_operations;
 523 #endif
 524
 525         /* make root inode
 526          * XXX: move this to after cbd setup? */
 527         valid = OBD_MD_FLGETATTR | OBD_MD_FLBLOCKS | OBD_MD_FLMODEASIZE;
 528         if (sbi->ll_flags & LL_SBI_ACL)
 529                 valid |= OBD_MD_FLACL;
 530
 531         OBD_ALLOC_PTR(op_data);
 532         if (op_data == NULL)
 533                 GOTO(out_lock_cn_cb, err = -ENOMEM);
 534
 535         op_data->op_fid1 = sbi->ll_root_fid;
 536         op_data->op_mode = 0;
 537         op_data->op_valid = valid;
 538
 539         err = md_getattr(sbi->ll_md_exp, op_data, &request);
 540
 541         OBD_FREE_PTR(op_data);
 542         if (err) {
 543                 CERROR("%s: md_getattr failed for root: rc = %d\n",
 544                        sbi->ll_md_exp->exp_obd->obd_name, err);
 545                 GOTO(out_lock_cn_cb, err);
 546         }
 547
 548         err = md_get_lustre_md(sbi->ll_md_exp, request, sbi->ll_dt_exp,
 549                                sbi->ll_md_exp, &lmd);
 550         if (err) {
 551                 CERROR("failed to understand root inode md: rc = %d\n", err);
 552                 ptlrpc_req_finished(request);
 553                 GOTO(out_lock_cn_cb, err);
 554         }
 555
 556         LASSERT(fid_is_sane(&sbi->ll_root_fid));
 557         root = ll_iget(sb, cl_fid_build_ino(&sbi->ll_root_fid,
 558                                             sbi->ll_flags & LL_SBI_32BIT_API),
 559                        &lmd);
 560         md_free_lustre_md(sbi->ll_md_exp, &lmd);
 561         ptlrpc_req_finished(request);
 562
 563         if (IS_ERR(root)) {
 564 #ifdef CONFIG_FS_POSIX_ACL
 565                 if (lmd.posix_acl) {
 566                         posix_acl_release(lmd.posix_acl);
 567                         lmd.posix_acl = NULL;
 568                 }
 569 #endif
 570                 err = IS_ERR(root) ? PTR_ERR(root) : -EBADF;
 571                 root = NULL;
 572                 CERROR("lustre_lite: bad iget4 for root\n");
 573                 GOTO(out_root, err);
 574         }
 575
 576         checksum = sbi->ll_flags & LL_SBI_CHECKSUM;
 577         if (sbi->ll_checksum_set) {
 578                 err = obd_set_info_async(NULL, sbi->ll_dt_exp,
 579                                          sizeof(KEY_CHECKSUM), KEY_CHECKSUM,
 580                                          sizeof(checksum), &checksum, NULL);
 581                 if (err) {
 582                         CERROR("%s: Set checksum failed: rc = %d\n",
 583                                sbi->ll_dt_exp->exp_obd->obd_name, err);
 584                         GOTO(out_root, err);
 585                 }
 586         }
 587         cl_sb_init(sb);
 588
 589         err = obd_set_info_async(NULL, sbi->ll_dt_exp, sizeof(KEY_CACHE_SET),
 590                                  KEY_CACHE_SET, sizeof(*sbi->ll_cache),
 591                                  sbi->ll_cache, NULL);
 592         if (err) {
 593                 CERROR("%s: Set cache_set failed: rc = %d\n",
 594                        sbi->ll_dt_exp->exp_obd->obd_name, err);
 595                 GOTO(out_root, err);
 596         }
 597
 598         sb->s_root = d_make_root(root);
 599         if (sb->s_root == NULL) {
 600                 CERROR("%s: can't make root dentry\n",
 601                         ll_get_fsname(sb, NULL, 0));
 602                 GOTO(out_root, err = -ENOMEM);
 603         }
 604 #ifdef HAVE_DCACHE_LOCK
 605         sb->s_root->d_op = &ll_d_ops;
 606 #endif
 607
 608         sbi->ll_sdev_orig = sb->s_dev;
 609
 610         /* We set sb->s_dev equal on all lustre clients in order to support
 611          * NFS export clustering.  NFSD requires that the FSID be the same
 612          * on all clients. */
 613         /* s_dev is also used in lt_compare() to compare two fs, but that is
 614          * only a node-local comparison. */
 615         uuid = obd_get_uuid(sbi->ll_md_exp);
 616         if (uuid != NULL)
 617                 sb->s_dev = get_uuid2int(uuid->uuid, strlen(uuid->uuid));
 618
 619         if (data != NULL)
 620                 OBD_FREE_PTR(data);
 621         if (osfs != NULL)
 622                 OBD_FREE_PTR(osfs);
 623
 624         if (sbi->ll_proc_root != NULL) {
 625                 err = lprocfs_ll_register_obd(sb, dt);
 626                 if (err < 0) {
 627                         CERROR("%s: could not register %s in llite: rc = %d\n",
 628                                dt, ll_get_fsname(sb, NULL, 0), err);
 629                         err = 0;
 630                 }
 631                 err = lprocfs_ll_register_obd(sb, md);
 632                 if (err < 0) {
 633                         CERROR("%s: could not register %s in llite: rc = %d\n",
 634                                md, ll_get_fsname(sb, NULL, 0), err);
 635                         err = 0;
 636                 }
 637         }
 638
 639         RETURN(err);
 640 out_root:
 641         if (root)
 642                 iput(root);
 643 out_lock_cn_cb:
 644         obd_fid_fini(sbi->ll_dt_exp->exp_obd);
 645 out_dt:
 646         obd_disconnect(sbi->ll_dt_exp);
 647         sbi->ll_dt_exp = NULL;
 648 out_md_fid:
 649         obd_fid_fini(sbi->ll_md_exp->exp_obd);
 650 out_md:
 651         obd_disconnect(sbi->ll_md_exp);
 652         sbi->ll_md_exp = NULL;
 653 out:
 654         if (data != NULL)
 655                 OBD_FREE_PTR(data);
 656         if (osfs != NULL)
 657                 OBD_FREE_PTR(osfs);
 658         return err;
 659 }
 660
 661 int ll_get_max_mdsize(struct ll_sb_info *sbi, int *lmmsize)
 662 {
 663         int size, rc;
 664
 665         size = sizeof(*lmmsize);
 666         rc = obd_get_info(NULL, sbi->ll_dt_exp, sizeof(KEY_MAX_EASIZE),
 667                           KEY_MAX_EASIZE, &size, lmmsize);
 668         if (rc != 0) {
 669                 CERROR("%s: cannot get max LOV EA size: rc = %d\n",
 670                        sbi->ll_dt_exp->exp_obd->obd_name, rc);
 671                 RETURN(rc);
 672         }
 673
 674         size = sizeof(int);
 675         rc = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_MAX_EASIZE),
 676                           KEY_MAX_EASIZE, &size, lmmsize);
 677         if (rc)
 678                 CERROR("Get max mdsize error rc %d\n", rc);
 679
 680         RETURN(rc);
 681 }
 682
 683 /**
 684  * Get the value of the default_easize parameter.
 685  *
 686  * \see client_obd::cl_default_mds_easize
 687  *
 688  * \param[in] sbi       superblock info for this filesystem
 689  * \param[out] lmmsize  pointer to storage location for value
 690  *
 691  * \retval 0            on success
 692  * \retval negative     negated errno on failure
 693  */
 694 int ll_get_default_mdsize(struct ll_sb_info *sbi, int *lmmsize)
 695 {
 696         int size, rc;
 697
 698         size = sizeof(int);
 699         rc = obd_get_info(NULL, sbi->ll_md_exp, sizeof(KEY_DEFAULT_EASIZE),
 700                          KEY_DEFAULT_EASIZE, &size, lmmsize);
 701         if (rc)
 702                 CERROR("Get default mdsize error rc %d\n", rc);
 703
 704         RETURN(rc);
 705 }
 706
 707 /**
 708  * Set the default_easize parameter to the given value.
 709  *
 710  * \see client_obd::cl_default_mds_easize
 711  *
 712  * \param[in] sbi       superblock info for this filesystem
 713  * \param[in] lmmsize   the size to set
 714  *
 715  * \retval 0            on success
 716  * \retval negative     negated errno on failure
 717  */
 718 int ll_set_default_mdsize(struct ll_sb_info *sbi, int lmmsize)
 719 {
 720         int rc;
 721
 722         if (lmmsize < sizeof(struct lov_mds_md) ||
 723             lmmsize > OBD_MAX_DEFAULT_EA_SIZE)
 724                 return -EINVAL;
 725
 726         rc = obd_set_info_async(NULL, sbi->ll_md_exp,
 727                                 sizeof(KEY_DEFAULT_EASIZE), KEY_DEFAULT_EASIZE,
 728                                 sizeof(int), &lmmsize, NULL);
 729
 730         RETURN(rc);
 731 }
 732
 733 static void client_common_put_super(struct super_block *sb)
 734 {
 735         struct ll_sb_info *sbi = ll_s2sbi(sb);
 736         ENTRY;
 737
 738         cl_sb_fini(sb);
 739
 740         obd_fid_fini(sbi->ll_dt_exp->exp_obd);
 741         obd_disconnect(sbi->ll_dt_exp);
 742         sbi->ll_dt_exp = NULL;
 743
 744         ll_debugfs_unregister_super(sb);
 745
 746         obd_fid_fini(sbi->ll_md_exp->exp_obd);
 747         obd_disconnect(sbi->ll_md_exp);
 748         sbi->ll_md_exp = NULL;
 749
 750         EXIT;
 751 }
 752
 753 void ll_kill_super(struct super_block *sb)
 754 {
 755         struct ll_sb_info *sbi;
 756         ENTRY;
 757
 758         /* not init sb ?*/
 759         if (!(sb->s_flags & MS_ACTIVE))
 760                 return;
 761
 762         sbi = ll_s2sbi(sb);
 763         /* we need restore s_dev from changed for clustred NFS before put_super
 764          * because new kernels have cached s_dev and change sb->s_dev in
 765          * put_super not affected real removing devices */
 766         if (sbi) {
 767                 sb->s_dev = sbi->ll_sdev_orig;
 768                 sbi->ll_umounting = 1;
 769
 770                 /* wait running statahead threads to quit */
 771                 while (atomic_read(&sbi->ll_sa_running) > 0) {
 772                         set_current_state(TASK_UNINTERRUPTIBLE);
 773                         schedule_timeout(msecs_to_jiffies(MSEC_PER_SEC >> 3));
 774                 }
 775         }
 776
 777         EXIT;
 778 }
 779
 780 static inline int ll_set_opt(const char *opt, char *data, int fl)
 781 {
 782         if (strncmp(opt, data, strlen(opt)) != 0)
 783                 return 0;
 784         else
 785                 return fl;
 786 }
 787
 788 /* non-client-specific mount options are parsed in lmd_parse */
 789 static int ll_options(char *options, struct ll_sb_info *sbi)
 790 {
 791         int tmp;
 792         char *s1 = options, *s2;
 793         int *flags = &sbi->ll_flags;
 794         ENTRY;
 795
 796         if (!options)
 797                 RETURN(0);
 798
 799         CDEBUG(D_CONFIG, "Parsing opts %s\n", options);
 800
 801         while (*s1) {
 802                 CDEBUG(D_SUPER, "next opt=%s\n", s1);
 803                 tmp = ll_set_opt("nolock", s1, LL_SBI_NOLCK);
 804                 if (tmp) {
 805                         *flags |= tmp;
 806                         goto next;
 807                 }
 808                 tmp = ll_set_opt("flock", s1, LL_SBI_FLOCK);
 809                 if (tmp) {
 810                         *flags |= tmp;
 811                         goto next;
 812                 }
 813                 tmp = ll_set_opt("localflock", s1, LL_SBI_LOCALFLOCK);
 814                 if (tmp) {
 815                         *flags |= tmp;
 816                         goto next;
 817                 }
 818                 tmp = ll_set_opt("noflock", s1, LL_SBI_FLOCK|LL_SBI_LOCALFLOCK);
 819                 if (tmp) {
 820                         *flags &= ~tmp;
 821                         goto next;
 822                 }
 823                 tmp = ll_set_opt("user_xattr", s1, LL_SBI_USER_XATTR);
 824                 if (tmp) {
 825                         *flags |= tmp;
 826                         goto next;
 827                 }
 828                 tmp = ll_set_opt("nouser_xattr", s1, LL_SBI_USER_XATTR);
 829                 if (tmp) {
 830                         *flags &= ~tmp;
 831                         goto next;
 832                 }
 833                 tmp = ll_set_opt("context", s1, 1);
 834                 if (tmp)
 835                         goto next;
 836                 tmp = ll_set_opt("fscontext", s1, 1);
 837                 if (tmp)
 838                         goto next;
 839                 tmp = ll_set_opt("defcontext", s1, 1);
 840                 if (tmp)
 841                         goto next;
 842                 tmp = ll_set_opt("rootcontext", s1, 1);
 843                 if (tmp)
 844                         goto next;
 845                 tmp = ll_set_opt("user_fid2path", s1, LL_SBI_USER_FID2PATH);
 846                 if (tmp) {
 847                         *flags |= tmp;
 848                         goto next;
 849                 }
 850                 tmp = ll_set_opt("nouser_fid2path", s1, LL_SBI_USER_FID2PATH);
 851                 if (tmp) {
 852                         *flags &= ~tmp;
 853                         goto next;
 854                 }
 855
 856                 tmp = ll_set_opt("checksum", s1, LL_SBI_CHECKSUM);
 857                 if (tmp) {
 858                         *flags |= tmp;
 859                         sbi->ll_checksum_set = 1;
 860                         goto next;
 861                 }
 862                 tmp = ll_set_opt("nochecksum", s1, LL_SBI_CHECKSUM);
 863                 if (tmp) {
 864                         *flags &= ~tmp;
 865                         sbi->ll_checksum_set = 1;
 866                         goto next;
 867                 }
 868                 tmp = ll_set_opt("lruresize", s1, LL_SBI_LRU_RESIZE);
 869                 if (tmp) {
 870                         *flags |= tmp;
 871                         goto next;
 872                 }
 873                 tmp = ll_set_opt("nolruresize", s1, LL_SBI_LRU_RESIZE);
 874                 if (tmp) {
 875                         *flags &= ~tmp;
 876                         goto next;
 877                 }
 878                 tmp = ll_set_opt("lazystatfs", s1, LL_SBI_LAZYSTATFS);
 879                 if (tmp) {
 880                         *flags |= tmp;
 881                         goto next;
 882                 }
 883                 tmp = ll_set_opt("nolazystatfs", s1, LL_SBI_LAZYSTATFS);
 884                 if (tmp) {
 885                         *flags &= ~tmp;
 886                         goto next;
 887                 }
 888                 tmp = ll_set_opt("32bitapi", s1, LL_SBI_32BIT_API);
 889                 if (tmp) {
 890                         *flags |= tmp;
 891                         goto next;
 892                 }
 893                 tmp = ll_set_opt("verbose", s1, LL_SBI_VERBOSE);
 894                 if (tmp) {
 895                         *flags |= tmp;
 896                         goto next;
 897                 }
 898                 tmp = ll_set_opt("noverbose", s1, LL_SBI_VERBOSE);
 899                 if (tmp) {
 900                         *flags &= ~tmp;
 901                         goto next;
 902                 }
 903                 tmp = ll_set_opt("always_ping", s1, LL_SBI_ALWAYS_PING);
 904                 if (tmp) {
 905                         *flags |= tmp;
 906                         goto next;
 907                 }
 908                 LCONSOLE_ERROR_MSG(0x152, "Unknown option '%s', won't mount.\n",
 909                                    s1);
 910                 RETURN(-EINVAL);
 911
 912 next:
 913                 /* Find next opt */
 914                 s2 = strchr(s1, ',');
 915                 if (s2 == NULL)
 916                         break;
 917                 s1 = s2 + 1;
 918         }
 919         RETURN(0);
 920 }
 921
 922 void ll_lli_init(struct ll_inode_info *lli)
 923 {
 924         lli->lli_inode_magic = LLI_INODE_MAGIC;
 925         lli->lli_flags = 0;
 926         spin_lock_init(&lli->lli_lock);
 927         lli->lli_posix_acl = NULL;
 928         /* Do not set lli_fid, it has been initialized already. */
 929         fid_zero(&lli->lli_pfid);
 930         lli->lli_mds_read_och = NULL;
 931         lli->lli_mds_write_och = NULL;
 932         lli->lli_mds_exec_och = NULL;
 933         lli->lli_open_fd_read_count = 0;
 934         lli->lli_open_fd_write_count = 0;
 935         lli->lli_open_fd_exec_count = 0;
 936         mutex_init(&lli->lli_och_mutex);
 937         spin_lock_init(&lli->lli_agl_lock);
 938         spin_lock_init(&lli->lli_layout_lock);
 939         ll_layout_version_set(lli, CL_LAYOUT_GEN_NONE);
 940         lli->lli_clob = NULL;
 941
 942         init_rwsem(&lli->lli_xattrs_list_rwsem);
 943         mutex_init(&lli->lli_xattrs_enq_lock);
 944
 945         LASSERT(lli->lli_vfs_inode.i_mode != 0);
 946         if (S_ISDIR(lli->lli_vfs_inode.i_mode)) {
 947                 mutex_init(&lli->lli_readdir_mutex);
 948                 lli->lli_opendir_key = NULL;
 949                 lli->lli_sai = NULL;
 950                 spin_lock_init(&lli->lli_sa_lock);
 951                 lli->lli_opendir_pid = 0;
 952                 lli->lli_sa_enabled = 0;
 953                 lli->lli_def_stripe_offset = -1;
 954         } else {
 955                 mutex_init(&lli->lli_size_mutex);
 956                 lli->lli_symlink_name = NULL;
 957                 init_rwsem(&lli->lli_trunc_sem);
 958                 range_lock_tree_init(&lli->lli_write_tree);
 959                 init_rwsem(&lli->lli_glimpse_sem);
 960                 lli->lli_glimpse_time = ktime_set(0, 0);
 961                 INIT_LIST_HEAD(&lli->lli_agl_list);
 962                 lli->lli_agl_index = 0;
 963                 lli->lli_async_rc = 0;
 964         }
 965         mutex_init(&lli->lli_layout_mutex);
 966         memset(lli->lli_jobid, 0, sizeof(lli->lli_jobid));
 967 }
 968
 969 #define MAX_STRING_SIZE 128
 970
 971 #ifndef HAVE_SUPER_SETUP_BDI_NAME
 972
 973 #define LSI_BDI_INITIALIZED     0x00400000
 974
 975 #ifndef HAVE_BDI_CAP_MAP_COPY
 976 # define BDI_CAP_MAP_COPY       0
 977 #endif
 978
 979 static int super_setup_bdi_name(struct super_block *sb, char *fmt, ...)
 980 {
 981         struct  lustre_sb_info *lsi = s2lsi(sb);
 982         char buf[MAX_STRING_SIZE];
 983         va_list args;
 984         int err;
 985
 986         err = bdi_init(&lsi->lsi_bdi);
 987         if (err)
 988                 return err;
 989
 990         lsi->lsi_flags |= LSI_BDI_INITIALIZED;
 991         lsi->lsi_bdi.capabilities = BDI_CAP_MAP_COPY;
 992         lsi->lsi_bdi.name = "lustre";
 993         va_start(args, fmt);
 994         vsnprintf(buf, MAX_STRING_SIZE, fmt, args);
 995         va_end(args);
 996         err = bdi_register(&lsi->lsi_bdi, NULL, "%s", buf);
 997         va_end(args);
 998         if (!err)
 999                 sb->s_bdi = &lsi->lsi_bdi;
1000
1001         return err;
1002 }
1003 #endif /* !HAVE_SUPER_SETUP_BDI_NAME */
1004
1005 int ll_fill_super(struct super_block *sb, struct vfsmount *mnt)
1006 {
1007         struct  lustre_profile *lprof = NULL;
1008         struct  lustre_sb_info *lsi = s2lsi(sb);
1009         struct  ll_sb_info *sbi = NULL;
1010         char    *dt = NULL, *md = NULL;
1011         char    *profilenm = get_profile_name(sb);
1012         struct config_llog_instance *cfg;
1013         /* %p for void* in printf needs 16+2 characters: 0xffffffffffffffff */
1014         const int instlen = sizeof(cfg->cfg_instance) * 2 + 2;
1015         char name[MAX_STRING_SIZE];
1016         int md_len = 0;
1017         int dt_len = 0;
1018         char *ptr;
1019         int len;
1020         int err;
1021
1022         ENTRY;
1023         CDEBUG(D_VFSTRACE, "VFS Op: sb %p\n", sb);
1024
1025         try_module_get(THIS_MODULE);
1026
1027         OBD_ALLOC_PTR(cfg);
1028         if (cfg == NULL)
1029                 GOTO(out_free, err = -ENOMEM);
1030
1031         /* client additional sb info */
1032         lsi->lsi_llsbi = sbi = ll_init_sbi();
1033         if (!sbi)
1034                 GOTO(out_free, err = -ENOMEM);
1035
1036         err = ll_options(lsi->lsi_lmd->lmd_opts, sbi);
1037         if (err)
1038                 GOTO(out_free, err);
1039
1040         err = super_setup_bdi_name(sb, "lustre-%p", sb);
1041         if (err)
1042                 GOTO(out_free, err);
1043
1044 #ifndef HAVE_DCACHE_LOCK
1045         /* kernel >= 2.6.38 store dentry operations in sb->s_d_op. */
1046         sb->s_d_op = &ll_d_ops;
1047 #endif
1048         /* Get fsname */
1049         len = strlen(lsi->lsi_lmd->lmd_profile);
1050         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
1051         if (ptr && (strcmp(ptr, "-client") == 0))
1052                 len -= 7;
1053
1054         /* Mount info */
1055         snprintf(name, MAX_STRING_SIZE, "%.*s-%p", len,
1056                  lsi->lsi_lmd->lmd_profile, sb);
1057
1058         /* Call ll_debugfs_register_super() before lustre_process_log()
1059          * so that "llite.*.*" params can be processed correctly.
1060          */
1061         err = ll_debugfs_register_super(sb, name);
1062         if (err < 0) {
1063                 CERROR("%s: could not register mountpoint in llite: rc = %d\n",
1064                        ll_get_fsname(sb, NULL, 0), err);
1065                 err = 0;
1066         }
1067
1068         /* Generate a string unique to this super, in case some joker tries
1069            to mount the same fs at two mount points.
1070            Use the address of the super itself.*/
1071         cfg->cfg_instance = sb;
1072         cfg->cfg_uuid = lsi->lsi_llsbi->ll_sb_uuid;
1073         cfg->cfg_callback = class_config_llog_handler;
1074         cfg->cfg_sub_clds = CONFIG_SUB_CLIENT;
1075         /* set up client obds */
1076         err = lustre_process_log(sb, profilenm, cfg);
1077         if (err < 0)
1078                 GOTO(out_proc, err);
1079
1080         /* Profile set with LCFG_MOUNTOPT so we can find our mdc and osc obds */
1081         lprof = class_get_profile(profilenm);
1082         if (lprof == NULL) {
1083                 LCONSOLE_ERROR_MSG(0x156, "The client profile '%s' could not be"
1084                                    " read from the MGS.  Does that filesystem "
1085                                    "exist?\n", profilenm);
1086                 GOTO(out_proc, err = -EINVAL);
1087         }
1088         CDEBUG(D_CONFIG, "Found profile %s: mdc=%s osc=%s\n", profilenm,
1089                lprof->lp_md, lprof->lp_dt);
1090
1091         dt_len = strlen(lprof->lp_dt) + instlen + 2;
1092         OBD_ALLOC(dt, dt_len);
1093         if (!dt)
1094                 GOTO(out_proc, err = -ENOMEM);
1095         snprintf(dt, dt_len - 1, "%s-%p", lprof->lp_dt, cfg->cfg_instance);
1096
1097         md_len = strlen(lprof->lp_md) + instlen + 2;
1098         OBD_ALLOC(md, md_len);
1099         if (!md)
1100                 GOTO(out_proc, err = -ENOMEM);
1101         snprintf(md, md_len - 1, "%s-%p", lprof->lp_md, cfg->cfg_instance);
1102
1103         /* connections, registrations, sb setup */
1104         err = client_common_fill_super(sb, md, dt, mnt);
1105         if (err < 0)
1106                 GOTO(out_proc, err);
1107
1108         sbi->ll_client_common_fill_super_succeeded = 1;
1109
1110 out_proc:
1111         if (err < 0)
1112                 ll_debugfs_unregister_super(sb);
1113 out_free:
1114         if (md)
1115                 OBD_FREE(md, md_len);
1116         if (dt)
1117                 OBD_FREE(dt, dt_len);
1118         if (lprof != NULL)
1119                 class_put_profile(lprof);
1120         if (cfg)
1121                 OBD_FREE_PTR(cfg);
1122         if (err)
1123                 ll_put_super(sb);
1124         else if (sbi->ll_flags & LL_SBI_VERBOSE)
1125                 LCONSOLE_WARN("Mounted %s\n", profilenm);
1126         RETURN(err);
1127 } /* ll_fill_super */
1128
1129 void ll_put_super(struct super_block *sb)
1130 {
1131         struct config_llog_instance cfg, params_cfg;
1132         struct obd_device *obd;
1133         struct lustre_sb_info *lsi = s2lsi(sb);
1134         struct ll_sb_info *sbi = ll_s2sbi(sb);
1135         char *profilenm = get_profile_name(sb);
1136         long ccc_count;
1137         int next, force = 1, rc = 0;
1138         ENTRY;
1139
1140         if (!sbi)
1141                 GOTO(out_no_sbi, 0);
1142
1143         CDEBUG(D_VFSTRACE, "VFS Op: sb %p - %s\n", sb, profilenm);
1144
1145         cfg.cfg_instance = sb;
1146         lustre_end_log(sb, profilenm, &cfg);
1147
1148         params_cfg.cfg_instance = sb;
1149         lustre_end_log(sb, PARAMS_FILENAME, &params_cfg);
1150
1151         if (sbi->ll_md_exp) {
1152                 obd = class_exp2obd(sbi->ll_md_exp);
1153                 if (obd)
1154                         force = obd->obd_force;
1155         }
1156
1157         /* Wait for unstable pages to be committed to stable storage */
1158         if (force == 0) {
1159                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
1160                 rc = l_wait_event(sbi->ll_cache->ccc_unstable_waitq,
1161                         atomic_long_read(&sbi->ll_cache->ccc_unstable_nr) == 0,
1162                         &lwi);
1163         }
1164
1165         ccc_count = atomic_long_read(&sbi->ll_cache->ccc_unstable_nr);
1166         if (force == 0 && rc != -EINTR)
1167                 LASSERTF(ccc_count == 0, "count: %li\n", ccc_count);
1168
1169
1170         /* We need to set force before the lov_disconnect in
1171            lustre_common_put_super, since l_d cleans up osc's as well. */
1172         if (force) {
1173                 next = 0;
1174                 while ((obd = class_devices_in_group(&sbi->ll_sb_uuid,
1175                                                      &next)) != NULL) {
1176                         obd->obd_force = force;
1177                 }
1178         }
1179
1180         if (sbi->ll_client_common_fill_super_succeeded) {
1181                 /* Only if client_common_fill_super succeeded */
1182                 client_common_put_super(sb);
1183         }
1184
1185         next = 0;
1186         while ((obd = class_devices_in_group(&sbi->ll_sb_uuid, &next)) !=NULL) {
1187                 class_manual_cleanup(obd);
1188         }
1189
1190         if (sbi->ll_flags & LL_SBI_VERBOSE)
1191                 LCONSOLE_WARN("Unmounted %s\n", profilenm ? profilenm : "");
1192
1193         if (profilenm)
1194                 class_del_profile(profilenm);
1195
1196 #ifndef HAVE_SUPER_SETUP_BDI_NAME
1197         if (lsi->lsi_flags & LSI_BDI_INITIALIZED) {
1198                 bdi_destroy(&lsi->lsi_bdi);
1199                 lsi->lsi_flags &= ~LSI_BDI_INITIALIZED;
1200         }
1201 #endif
1202
1203         ll_free_sbi(sb);
1204         lsi->lsi_llsbi = NULL;
1205 out_no_sbi:
1206         lustre_common_put_super(sb);
1207
1208         cl_env_cache_purge(~0);
1209
1210         module_put(THIS_MODULE);
1211
1212         EXIT;
1213 } /* client_put_super */
1214
1215 struct inode *ll_inode_from_resource_lock(struct ldlm_lock *lock)
1216 {
1217         struct inode *inode = NULL;
1218
1219         /* NOTE: we depend on atomic igrab() -bzzz */
1220         lock_res_and_lock(lock);
1221         if (lock->l_resource->lr_lvb_inode) {
1222                 struct ll_inode_info * lli;
1223                 lli = ll_i2info(lock->l_resource->lr_lvb_inode);
1224                 if (lli->lli_inode_magic == LLI_INODE_MAGIC) {
1225                         inode = igrab(lock->l_resource->lr_lvb_inode);
1226                 } else {
1227                         inode = lock->l_resource->lr_lvb_inode;
1228                         LDLM_DEBUG_LIMIT(inode->i_state & I_FREEING ?  D_INFO :
1229                                          D_WARNING, lock, "lr_lvb_inode %p is "
1230                                          "bogus: magic %08x",
1231                                          lock->l_resource->lr_lvb_inode,
1232                                          lli->lli_inode_magic);
1233                         inode = NULL;
1234                 }
1235         }
1236         unlock_res_and_lock(lock);
1237         return inode;
1238 }
1239
1240 void ll_dir_clear_lsm_md(struct inode *inode)
1241 {
1242         struct ll_inode_info *lli = ll_i2info(inode);
1243
1244         LASSERT(S_ISDIR(inode->i_mode));
1245
1246         if (lli->lli_lsm_md != NULL) {
1247                 lmv_free_memmd(lli->lli_lsm_md);
1248                 lli->lli_lsm_md = NULL;
1249         }
1250 }
1251
1252 static struct inode *ll_iget_anon_dir(struct super_block *sb,
1253                                       const struct lu_fid *fid,
1254                                       struct lustre_md *md)
1255 {
1256         struct ll_sb_info       *sbi = ll_s2sbi(sb);
1257         struct mdt_body         *body = md->body;
1258         struct inode            *inode;
1259         ino_t                   ino;
1260         ENTRY;
1261
1262         ino = cl_fid_build_ino(fid, sbi->ll_flags & LL_SBI_32BIT_API);
1263         inode = iget_locked(sb, ino);
1264         if (inode == NULL) {
1265                 CERROR("%s: failed get simple inode "DFID": rc = -ENOENT\n",
1266                        ll_get_fsname(sb, NULL, 0), PFID(fid));
1267                 RETURN(ERR_PTR(-ENOENT));
1268         }
1269
1270         if (inode->i_state & I_NEW) {
1271                 struct ll_inode_info *lli = ll_i2info(inode);
1272                 struct lmv_stripe_md *lsm = md->lmv;
1273
1274                 inode->i_mode = (inode->i_mode & ~S_IFMT) |
1275                                 (body->mbo_mode & S_IFMT);
1276                 LASSERTF(S_ISDIR(inode->i_mode), "Not slave inode "DFID"\n",
1277                          PFID(fid));
1278
1279                 LTIME_S(inode->i_mtime) = 0;
1280                 LTIME_S(inode->i_atime) = 0;
1281                 LTIME_S(inode->i_ctime) = 0;
1282                 inode->i_rdev = 0;
1283
1284 #ifdef HAVE_BACKING_DEV_INFO
1285                 /* initializing backing dev info. */
1286                 inode->i_mapping->backing_dev_info =
1287                                                 &s2lsi(inode->i_sb)->lsi_bdi;
1288 #endif
1289                 inode->i_op = &ll_dir_inode_operations;
1290                 inode->i_fop = &ll_dir_operations;
1291                 lli->lli_fid = *fid;
1292                 ll_lli_init(lli);
1293
1294                 LASSERT(lsm != NULL);
1295                 /* master object FID */
1296                 lli->lli_pfid = body->mbo_fid1;
1297                 CDEBUG(D_INODE, "lli %p slave "DFID" master "DFID"\n",
1298                        lli, PFID(fid), PFID(&lli->lli_pfid));
1299                 unlock_new_inode(inode);
1300         }
1301
1302         RETURN(inode);
1303 }
1304
1305 static int ll_init_lsm_md(struct inode *inode, struct lustre_md *md)
1306 {
1307         struct lu_fid *fid;
1308         struct lmv_stripe_md *lsm = md->lmv;
1309         int i;
1310
1311         LASSERT(lsm != NULL);
1312         /* XXX sigh, this lsm_root initialization should be in
1313          * LMV layer, but it needs ll_iget right now, so we
1314          * put this here right now. */
1315         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1316                 fid = &lsm->lsm_md_oinfo[i].lmo_fid;
1317                 LASSERT(lsm->lsm_md_oinfo[i].lmo_root == NULL);
1318                 /* Unfortunately ll_iget will call ll_update_inode,
1319                  * where the initialization of slave inode is slightly
1320                  * different, so it reset lsm_md to NULL to avoid
1321                  * initializing lsm for slave inode. */
1322                 /* For migrating inode, master stripe and master object will
1323                  * be same, so we only need assign this inode */
1324                 if (lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION && i == 0)
1325                         lsm->lsm_md_oinfo[i].lmo_root = inode;
1326                 else
1327                         lsm->lsm_md_oinfo[i].lmo_root =
1328                                 ll_iget_anon_dir(inode->i_sb, fid, md);
1329
1330                 if (IS_ERR(lsm->lsm_md_oinfo[i].lmo_root)) {
1331                         int rc = PTR_ERR(lsm->lsm_md_oinfo[i].lmo_root);
1332
1333                         lsm->lsm_md_oinfo[i].lmo_root = NULL;
1334                         return rc;
1335                 }
1336         }
1337
1338         return 0;
1339 }
1340
1341 static inline int lli_lsm_md_eq(const struct lmv_stripe_md *lsm_md1,
1342                                 const struct lmv_stripe_md *lsm_md2)
1343 {
1344         return lsm_md1->lsm_md_magic == lsm_md2->lsm_md_magic &&
1345                lsm_md1->lsm_md_stripe_count == lsm_md2->lsm_md_stripe_count &&
1346                lsm_md1->lsm_md_master_mdt_index ==
1347                                         lsm_md2->lsm_md_master_mdt_index &&
1348                lsm_md1->lsm_md_hash_type == lsm_md2->lsm_md_hash_type &&
1349                lsm_md1->lsm_md_layout_version ==
1350                                         lsm_md2->lsm_md_layout_version &&
1351                strcmp(lsm_md1->lsm_md_pool_name,
1352                       lsm_md2->lsm_md_pool_name) == 0;
1353 }
1354
1355 static int ll_update_lsm_md(struct inode *inode, struct lustre_md *md)
1356 {
1357         struct ll_inode_info *lli = ll_i2info(inode);
1358         struct lmv_stripe_md *lsm = md->lmv;
1359         int     rc;
1360         ENTRY;
1361
1362         LASSERT(S_ISDIR(inode->i_mode));
1363         CDEBUG(D_INODE, "update lsm %p of "DFID"\n", lli->lli_lsm_md,
1364                PFID(ll_inode2fid(inode)));
1365
1366         /* no striped information from request. */
1367         if (lsm == NULL) {
1368                 if (lli->lli_lsm_md == NULL) {
1369                         RETURN(0);
1370                 } else if (lli->lli_lsm_md->lsm_md_hash_type &
1371                                                 LMV_HASH_FLAG_MIGRATION) {
1372                         /* migration is done, the temporay MIGRATE layout has
1373                          * been removed */
1374                         CDEBUG(D_INODE, DFID" finish migration.\n",
1375                                PFID(ll_inode2fid(inode)));
1376                         lmv_free_memmd(lli->lli_lsm_md);
1377                         lli->lli_lsm_md = NULL;
1378                         RETURN(0);
1379                 } else {
1380                         /* The lustre_md from req does not include stripeEA,
1381                          * see ll_md_setattr */
1382                         RETURN(0);
1383                 }
1384         }
1385
1386         /* set the directory layout */
1387         if (lli->lli_lsm_md == NULL) {
1388                 struct cl_attr  *attr;
1389
1390                 rc = ll_init_lsm_md(inode, md);
1391                 if (rc != 0)
1392                         RETURN(rc);
1393
1394                 /* set md->lmv to NULL, so the following free lustre_md
1395                  * will not free this lsm */
1396                 md->lmv = NULL;
1397                 lli->lli_lsm_md = lsm;
1398
1399                 OBD_ALLOC_PTR(attr);
1400                 if (attr == NULL)
1401                         RETURN(-ENOMEM);
1402
1403                 /* validate the lsm */
1404                 rc = md_merge_attr(ll_i2mdexp(inode), lsm, attr,
1405                                    ll_md_blocking_ast);
1406                 if (rc != 0) {
1407                         OBD_FREE_PTR(attr);
1408                         RETURN(rc);
1409                 }
1410
1411                 if (md->body->mbo_valid & OBD_MD_FLNLINK)
1412                         md->body->mbo_nlink = attr->cat_nlink;
1413                 if (md->body->mbo_valid & OBD_MD_FLSIZE)
1414                         md->body->mbo_size = attr->cat_size;
1415                 if (md->body->mbo_valid & OBD_MD_FLATIME)
1416                         md->body->mbo_atime = attr->cat_atime;
1417                 if (md->body->mbo_valid & OBD_MD_FLCTIME)
1418                         md->body->mbo_ctime = attr->cat_ctime;
1419                 if (md->body->mbo_valid & OBD_MD_FLMTIME)
1420                         md->body->mbo_mtime = attr->cat_mtime;
1421
1422                 OBD_FREE_PTR(attr);
1423
1424                 CDEBUG(D_INODE, "Set lsm %p magic %x to "DFID"\n", lsm,
1425                        lsm->lsm_md_magic, PFID(ll_inode2fid(inode)));
1426                 RETURN(0);
1427         }
1428
1429         /* Compare the old and new stripe information */
1430         if (!lsm_md_eq(lli->lli_lsm_md, lsm)) {
1431                 struct lmv_stripe_md    *old_lsm = lli->lli_lsm_md;
1432                 int                     idx;
1433
1434                 CERROR("%s: inode "DFID"(%p)'s lmv layout mismatch (%p)/(%p)"
1435                        "magic:0x%x/0x%x stripe count: %d/%d master_mdt: %d/%d"
1436                        "hash_type:0x%x/0x%x layout: 0x%x/0x%x pool:%s/%s\n",
1437                        ll_get_fsname(inode->i_sb, NULL, 0), PFID(&lli->lli_fid),
1438                        inode, lsm, old_lsm,
1439                        lsm->lsm_md_magic, old_lsm->lsm_md_magic,
1440                        lsm->lsm_md_stripe_count,
1441                        old_lsm->lsm_md_stripe_count,
1442                        lsm->lsm_md_master_mdt_index,
1443                        old_lsm->lsm_md_master_mdt_index,
1444                        lsm->lsm_md_hash_type, old_lsm->lsm_md_hash_type,
1445                        lsm->lsm_md_layout_version,
1446                        old_lsm->lsm_md_layout_version,
1447                        lsm->lsm_md_pool_name,
1448                        old_lsm->lsm_md_pool_name);
1449
1450                 for (idx = 0; idx < old_lsm->lsm_md_stripe_count; idx++) {
1451                         CERROR("%s: sub FIDs in old lsm idx %d, old: "DFID"\n",
1452                                ll_get_fsname(inode->i_sb, NULL, 0), idx,
1453                                PFID(&old_lsm->lsm_md_oinfo[idx].lmo_fid));
1454                 }
1455
1456                 for (idx = 0; idx < lsm->lsm_md_stripe_count; idx++) {
1457                         CERROR("%s: sub FIDs in new lsm idx %d, new: "DFID"\n",
1458                                ll_get_fsname(inode->i_sb, NULL, 0), idx,
1459                                PFID(&lsm->lsm_md_oinfo[idx].lmo_fid));
1460                 }
1461
1462                 RETURN(-EIO);
1463         }
1464
1465         RETURN(0);
1466 }
1467
1468 void ll_clear_inode(struct inode *inode)
1469 {
1470         struct ll_inode_info *lli = ll_i2info(inode);
1471         struct ll_sb_info *sbi = ll_i2sbi(inode);
1472         ENTRY;
1473
1474         CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
1475                PFID(ll_inode2fid(inode)), inode);
1476
1477         if (S_ISDIR(inode->i_mode)) {
1478                 /* these should have been cleared in ll_file_release */
1479                 LASSERT(lli->lli_opendir_key == NULL);
1480                 LASSERT(lli->lli_sai == NULL);
1481                 LASSERT(lli->lli_opendir_pid == 0);
1482         }
1483
1484         md_null_inode(sbi->ll_md_exp, ll_inode2fid(inode));
1485
1486         LASSERT(!lli->lli_open_fd_write_count);
1487         LASSERT(!lli->lli_open_fd_read_count);
1488         LASSERT(!lli->lli_open_fd_exec_count);
1489
1490         if (lli->lli_mds_write_och)
1491                 ll_md_real_close(inode, FMODE_WRITE);
1492         if (lli->lli_mds_exec_och)
1493                 ll_md_real_close(inode, FMODE_EXEC);
1494         if (lli->lli_mds_read_och)
1495                 ll_md_real_close(inode, FMODE_READ);
1496
1497         if (S_ISLNK(inode->i_mode) && lli->lli_symlink_name) {
1498                 OBD_FREE(lli->lli_symlink_name,
1499                          strlen(lli->lli_symlink_name) + 1);
1500                 lli->lli_symlink_name = NULL;
1501         }
1502
1503         ll_xattr_cache_destroy(inode);
1504
1505 #ifdef CONFIG_FS_POSIX_ACL
1506         forget_all_cached_acls(inode);
1507         if (lli->lli_posix_acl) {
1508                 LASSERT(atomic_read(&lli->lli_posix_acl->a_refcount) == 1);
1509                 posix_acl_release(lli->lli_posix_acl);
1510                 lli->lli_posix_acl = NULL;
1511         }
1512 #endif
1513         lli->lli_inode_magic = LLI_INODE_DEAD;
1514
1515         if (S_ISDIR(inode->i_mode))
1516                 ll_dir_clear_lsm_md(inode);
1517         else if (S_ISREG(inode->i_mode) && !is_bad_inode(inode))
1518                 LASSERT(list_empty(&lli->lli_agl_list));
1519
1520         /*
1521          * XXX This has to be done before lsm is freed below, because
1522          * cl_object still uses inode lsm.
1523          */
1524         cl_inode_fini(inode);
1525
1526         EXIT;
1527 }
1528
1529 static int ll_md_setattr(struct dentry *dentry, struct md_op_data *op_data)
1530 {
1531         struct lustre_md md;
1532         struct inode *inode = dentry->d_inode;
1533         struct ll_sb_info *sbi = ll_i2sbi(inode);
1534         struct ptlrpc_request *request = NULL;
1535         int rc, ia_valid;
1536         ENTRY;
1537
1538         op_data = ll_prep_md_op_data(op_data, inode, NULL, NULL, 0, 0,
1539                                      LUSTRE_OPC_ANY, NULL);
1540         if (IS_ERR(op_data))
1541                 RETURN(PTR_ERR(op_data));
1542
1543         rc = md_setattr(sbi->ll_md_exp, op_data, NULL, 0, &request);
1544         if (rc) {
1545                 ptlrpc_req_finished(request);
1546                 if (rc == -ENOENT) {
1547                         clear_nlink(inode);
1548                         /* Unlinked special device node? Or just a race?
1549                          * Pretend we done everything. */
1550                         if (!S_ISREG(inode->i_mode) &&
1551                             !S_ISDIR(inode->i_mode)) {
1552                                 ia_valid = op_data->op_attr.ia_valid;
1553                                 op_data->op_attr.ia_valid &= ~TIMES_SET_FLAGS;
1554                                 rc = simple_setattr(dentry, &op_data->op_attr);
1555                                 op_data->op_attr.ia_valid = ia_valid;
1556                         }
1557                 } else if (rc != -EPERM && rc != -EACCES && rc != -ETXTBSY) {
1558                         CERROR("md_setattr fails: rc = %d\n", rc);
1559                 }
1560                 RETURN(rc);
1561         }
1562
1563         rc = md_get_lustre_md(sbi->ll_md_exp, request, sbi->ll_dt_exp,
1564                               sbi->ll_md_exp, &md);
1565         if (rc) {
1566                 ptlrpc_req_finished(request);
1567                 RETURN(rc);
1568         }
1569
1570         ia_valid = op_data->op_attr.ia_valid;
1571         /* inode size will be in ll_setattr_ost, can't do it now since dirty
1572          * cache is not cleared yet. */
1573         op_data->op_attr.ia_valid &= ~(TIMES_SET_FLAGS | ATTR_SIZE);
1574         if (S_ISREG(inode->i_mode))
1575                 inode_lock(inode);
1576         rc = simple_setattr(dentry, &op_data->op_attr);
1577         if (S_ISREG(inode->i_mode))
1578                 inode_unlock(inode);
1579         op_data->op_attr.ia_valid = ia_valid;
1580
1581         rc = ll_update_inode(inode, &md);
1582         ptlrpc_req_finished(request);
1583
1584         RETURN(rc);
1585 }
1586
1587 /* If this inode has objects allocated to it (lsm != NULL), then the OST
1588  * object(s) determine the file size and mtime.  Otherwise, the MDS will
1589  * keep these values until such a time that objects are allocated for it.
1590  * We do the MDS operations first, as it is checking permissions for us.
1591  * We don't to the MDS RPC if there is nothing that we want to store there,
1592  * otherwise there is no harm in updating mtime/atime on the MDS if we are
1593  * going to do an RPC anyways.
1594  *
1595  * If we are doing a truncate, we will send the mtime and ctime updates
1596  * to the OST with the punch RPC, otherwise we do an explicit setattr RPC.
1597  * I don't believe it is possible to get e.g. ATTR_MTIME_SET and ATTR_SIZE
1598  * at the same time.
1599  *
1600  * In case of HSMimport, we only set attr on MDS.
1601  */
1602 int ll_setattr_raw(struct dentry *dentry, struct iattr *attr, bool hsm_import)
1603 {
1604         struct inode *inode = dentry->d_inode;
1605         struct ll_inode_info *lli = ll_i2info(inode);
1606         struct md_op_data *op_data = NULL;
1607         int rc = 0;
1608         ENTRY;
1609
1610         CDEBUG(D_VFSTRACE, "%s: setattr inode "DFID"(%p) from %llu to %llu, "
1611                "valid %x, hsm_import %d\n",
1612                ll_get_fsname(inode->i_sb, NULL, 0), PFID(&lli->lli_fid),
1613                inode, i_size_read(inode), attr->ia_size, attr->ia_valid,
1614                hsm_import);
1615
1616         if (attr->ia_valid & ATTR_SIZE) {
1617                 /* Check new size against VFS/VM file size limit and rlimit */
1618                 rc = inode_newsize_ok(inode, attr->ia_size);
1619                 if (rc)
1620                         RETURN(rc);
1621
1622                 /* The maximum Lustre file size is variable, based on the
1623                  * OST maximum object size and number of stripes.  This
1624                  * needs another check in addition to the VFS check above. */
1625                 if (attr->ia_size > ll_file_maxbytes(inode)) {
1626                         CDEBUG(D_INODE,"file "DFID" too large %llu > %llu\n",
1627                                PFID(&lli->lli_fid), attr->ia_size,
1628                                ll_file_maxbytes(inode));
1629                         RETURN(-EFBIG);
1630                 }
1631
1632                 attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
1633         }
1634
1635         /* POSIX: check before ATTR_*TIME_SET set (from inode_change_ok) */
1636         if (attr->ia_valid & TIMES_SET_FLAGS) {
1637                 if ((!uid_eq(current_fsuid(), inode->i_uid)) &&
1638                     !cfs_capable(CFS_CAP_FOWNER))
1639                         RETURN(-EPERM);
1640         }
1641
1642         /* We mark all of the fields "set" so MDS/OST does not re-set them */
1643         if (!(attr->ia_valid & ATTR_CTIME_SET) &&
1644             (attr->ia_valid & ATTR_CTIME)) {
1645                 attr->ia_ctime = current_time(inode);
1646                 attr->ia_valid |= ATTR_CTIME_SET;
1647         }
1648         if (!(attr->ia_valid & ATTR_ATIME_SET) &&
1649             (attr->ia_valid & ATTR_ATIME)) {
1650                 attr->ia_atime = current_time(inode);
1651                 attr->ia_valid |= ATTR_ATIME_SET;
1652         }
1653         if (!(attr->ia_valid & ATTR_MTIME_SET) &&
1654             (attr->ia_valid & ATTR_MTIME)) {
1655                 attr->ia_mtime = current_time(inode);
1656                 attr->ia_valid |= ATTR_MTIME_SET;
1657         }
1658
1659         if (attr->ia_valid & (ATTR_MTIME | ATTR_CTIME))
1660                 CDEBUG(D_INODE, "setting mtime %lu, ctime %lu, now = %llu\n",
1661                        LTIME_S(attr->ia_mtime), LTIME_S(attr->ia_ctime),
1662                        (s64)ktime_get_real_seconds());
1663
1664         if (S_ISREG(inode->i_mode)) {
1665                 if (attr->ia_valid & ATTR_SIZE)
1666                         inode_dio_write_done(inode);
1667                 inode_unlock(inode);
1668         }
1669
1670         /* We always do an MDS RPC, even if we're only changing the size;
1671          * only the MDS knows whether truncate() should fail with -ETXTBUSY */
1672
1673         OBD_ALLOC_PTR(op_data);
1674         if (op_data == NULL)
1675                 GOTO(out, rc = -ENOMEM);
1676
1677         if (!hsm_import && attr->ia_valid & ATTR_SIZE) {
1678                 /* If we are changing file size, file content is
1679                  * modified, flag it. */
1680                 attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
1681                 op_data->op_bias |= MDS_DATA_MODIFIED;
1682                 ll_file_clear_flag(lli, LLIF_DATA_MODIFIED);
1683         }
1684
1685         op_data->op_attr = *attr;
1686
1687         rc = ll_md_setattr(dentry, op_data);
1688         if (rc)
1689                 GOTO(out, rc);
1690
1691         if (!S_ISREG(inode->i_mode) || hsm_import)
1692                 GOTO(out, rc = 0);
1693
1694         if (attr->ia_valid & (ATTR_SIZE |
1695                               ATTR_ATIME | ATTR_ATIME_SET |
1696                               ATTR_MTIME | ATTR_MTIME_SET |
1697                               ATTR_CTIME | ATTR_CTIME_SET)) {
1698                 /* For truncate and utimes sending attributes to OSTs, setting
1699                  * mtime/atime to the past will be performed under PW [0:EOF]
1700                  * extent lock (new_size:EOF for truncate).  It may seem
1701                  * excessive to send mtime/atime updates to OSTs when not
1702                  * setting times to past, but it is necessary due to possible
1703                  * time de-synchronization between MDT inode and OST objects */
1704                 rc = cl_setattr_ost(lli->lli_clob, attr, 0);
1705         }
1706
1707         /* If the file was restored, it needs to set dirty flag.
1708          *
1709          * We've already sent MDS_DATA_MODIFIED flag in
1710          * ll_md_setattr() for truncate. However, the MDT refuses to
1711          * set the HS_DIRTY flag on released files, so we have to set
1712          * it again if the file has been restored. Please check how
1713          * LLIF_DATA_MODIFIED is set in vvp_io_setattr_fini().
1714          *
1715          * Please notice that if the file is not released, the previous
1716          * MDS_DATA_MODIFIED has taken effect and usually
1717          * LLIF_DATA_MODIFIED is not set(see vvp_io_setattr_fini()).
1718          * This way we can save an RPC for common open + trunc
1719          * operation. */
1720         if (ll_file_test_and_clear_flag(lli, LLIF_DATA_MODIFIED)) {
1721                 struct hsm_state_set hss = {
1722                         .hss_valid = HSS_SETMASK,
1723                         .hss_setmask = HS_DIRTY,
1724                 };
1725                 int rc2;
1726
1727                 rc2 = ll_hsm_state_set(inode, &hss);
1728                 /* truncate and write can happen at the same time, so that
1729                  * the file can be set modified even though the file is not
1730                  * restored from released state, and ll_hsm_state_set() is
1731                  * not applicable for the file, and rc2 < 0 is normal in this
1732                  * case. */
1733                 if (rc2 < 0)
1734                         CDEBUG(D_INFO, DFID "HSM set dirty failed: rc2 = %d\n",
1735                                PFID(ll_inode2fid(inode)), rc2);
1736         }
1737
1738         EXIT;
1739 out:
1740         if (op_data != NULL)
1741                 ll_finish_md_op_data(op_data);
1742
1743         if (S_ISREG(inode->i_mode)) {
1744                 inode_lock(inode);
1745                 if ((attr->ia_valid & ATTR_SIZE) && !hsm_import)
1746                         inode_dio_wait(inode);
1747                 /* Once we've got the i_mutex, it's safe to set the S_NOSEC
1748                  * flag.  ll_update_inode (called from ll_md_setattr), clears
1749                  * inode flags, so there is a gap where S_NOSEC is not set.
1750                  * This can cause a writer to take the i_mutex unnecessarily,
1751                  * but this is safe to do and should be rare. */
1752                 inode_has_no_xattr(inode);
1753         }
1754
1755         ll_stats_ops_tally(ll_i2sbi(inode), (attr->ia_valid & ATTR_SIZE) ?
1756                         LPROC_LL_TRUNC : LPROC_LL_SETATTR, 1);
1757
1758         return rc;
1759 }
1760
1761 int ll_setattr(struct dentry *de, struct iattr *attr)
1762 {
1763         int mode = de->d_inode->i_mode;
1764
1765         if ((attr->ia_valid & (ATTR_CTIME|ATTR_SIZE|ATTR_MODE)) ==
1766                               (ATTR_CTIME|ATTR_SIZE|ATTR_MODE))
1767                 attr->ia_valid |= MDS_OPEN_OWNEROVERRIDE;
1768
1769         if (((attr->ia_valid & (ATTR_MODE|ATTR_FORCE|ATTR_SIZE)) ==
1770                                (ATTR_SIZE|ATTR_MODE)) &&
1771             (((mode & S_ISUID) && !(attr->ia_mode & S_ISUID)) ||
1772              (((mode & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP)) &&
1773               !(attr->ia_mode & S_ISGID))))
1774                 attr->ia_valid |= ATTR_FORCE;
1775
1776         if ((attr->ia_valid & ATTR_MODE) &&
1777             (mode & S_ISUID) &&
1778             !(attr->ia_mode & S_ISUID) &&
1779             !(attr->ia_valid & ATTR_KILL_SUID))
1780                 attr->ia_valid |= ATTR_KILL_SUID;
1781
1782         if ((attr->ia_valid & ATTR_MODE) &&
1783             ((mode & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP)) &&
1784             !(attr->ia_mode & S_ISGID) &&
1785             !(attr->ia_valid & ATTR_KILL_SGID))
1786                 attr->ia_valid |= ATTR_KILL_SGID;
1787
1788         /* avoid polluted from ATTR_TIMES_SET,
1789          * projid is not expected to be set here */
1790         attr->ia_valid &= ~MDS_ATTR_PROJID;
1791
1792         return ll_setattr_raw(de, attr, false);
1793 }
1794
1795 int ll_statfs_internal(struct ll_sb_info *sbi, struct obd_statfs *osfs,
1796                        u32 flags)
1797 {
1798         struct obd_statfs obd_osfs;
1799         time64_t max_age;
1800         int rc;
1801
1802         ENTRY;
1803         max_age = ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS;
1804
1805         rc = obd_statfs(NULL, sbi->ll_md_exp, osfs, max_age, flags);
1806         if (rc) {
1807                 CERROR("md_statfs fails: rc = %d\n", rc);
1808                 RETURN(rc);
1809         }
1810
1811         osfs->os_type = LL_SUPER_MAGIC;
1812
1813         CDEBUG(D_SUPER, "MDC blocks %llu/%llu objects %llu/%llu\n",
1814                osfs->os_bavail, osfs->os_blocks, osfs->os_ffree,osfs->os_files);
1815
1816         if (sbi->ll_flags & LL_SBI_LAZYSTATFS)
1817                 flags |= OBD_STATFS_NODELAY;
1818
1819         rc = obd_statfs(NULL, sbi->ll_dt_exp, &obd_osfs, max_age, flags);
1820         if (rc) {
1821                 CERROR("obd_statfs fails: rc = %d\n", rc);
1822                 RETURN(rc);
1823         }
1824
1825         CDEBUG(D_SUPER, "OSC blocks %llu/%llu objects %llu/%llu\n",
1826                obd_osfs.os_bavail, obd_osfs.os_blocks, obd_osfs.os_ffree,
1827                obd_osfs.os_files);
1828
1829         osfs->os_bsize = obd_osfs.os_bsize;
1830         osfs->os_blocks = obd_osfs.os_blocks;
1831         osfs->os_bfree = obd_osfs.os_bfree;
1832         osfs->os_bavail = obd_osfs.os_bavail;
1833
1834         /* If we don't have as many objects free on the OST as inodes
1835          * on the MDS, we reduce the total number of inodes to
1836          * compensate, so that the "inodes in use" number is correct.
1837          */
1838         if (obd_osfs.os_ffree < osfs->os_ffree) {
1839                 osfs->os_files = (osfs->os_files - osfs->os_ffree) +
1840                         obd_osfs.os_ffree;
1841                 osfs->os_ffree = obd_osfs.os_ffree;
1842         }
1843
1844         RETURN(rc);
1845 }
1846 int ll_statfs(struct dentry *de, struct kstatfs *sfs)
1847 {
1848         struct super_block *sb = de->d_sb;
1849         struct obd_statfs osfs;
1850         __u64 fsid = huge_encode_dev(sb->s_dev);
1851         int rc;
1852
1853         CDEBUG(D_VFSTRACE, "VFS Op: at %llu jiffies\n", get_jiffies_64());
1854         ll_stats_ops_tally(ll_s2sbi(sb), LPROC_LL_STAFS, 1);
1855
1856         /* Some amount of caching on the client is allowed */
1857         rc = ll_statfs_internal(ll_s2sbi(sb), &osfs, 0);
1858         if (rc)
1859                 return rc;
1860
1861         statfs_unpack(sfs, &osfs);
1862
1863         /* We need to downshift for all 32-bit kernels, because we can't
1864          * tell if the kernel is being called via sys_statfs64() or not.
1865          * Stop before overflowing f_bsize - in which case it is better
1866          * to just risk EOVERFLOW if caller is using old sys_statfs(). */
1867         if (sizeof(long) < 8) {
1868                 while (osfs.os_blocks > ~0UL && sfs->f_bsize < 0x40000000) {
1869                         sfs->f_bsize <<= 1;
1870
1871                         osfs.os_blocks >>= 1;
1872                         osfs.os_bfree >>= 1;
1873                         osfs.os_bavail >>= 1;
1874                 }
1875         }
1876
1877         sfs->f_blocks = osfs.os_blocks;
1878         sfs->f_bfree = osfs.os_bfree;
1879         sfs->f_bavail = osfs.os_bavail;
1880         sfs->f_fsid.val[0] = (__u32)fsid;
1881         sfs->f_fsid.val[1] = (__u32)(fsid >> 32);
1882         return 0;
1883 }
1884
1885 void ll_inode_size_lock(struct inode *inode)
1886 {
1887         struct ll_inode_info *lli;
1888
1889         LASSERT(!S_ISDIR(inode->i_mode));
1890
1891         lli = ll_i2info(inode);
1892         mutex_lock(&lli->lli_size_mutex);
1893 }
1894
1895 void ll_inode_size_unlock(struct inode *inode)
1896 {
1897         struct ll_inode_info *lli;
1898
1899         lli = ll_i2info(inode);
1900         mutex_unlock(&lli->lli_size_mutex);
1901 }
1902
1903 void ll_update_inode_flags(struct inode *inode, int ext_flags)
1904 {
1905         inode->i_flags = ll_ext_to_inode_flags(ext_flags);
1906         if (ext_flags & LUSTRE_PROJINHERIT_FL)
1907                 ll_file_set_flag(ll_i2info(inode), LLIF_PROJECT_INHERIT);
1908         else
1909                 ll_file_clear_flag(ll_i2info(inode), LLIF_PROJECT_INHERIT);
1910 }
1911
1912 int ll_update_inode(struct inode *inode, struct lustre_md *md)
1913 {
1914         struct ll_inode_info *lli = ll_i2info(inode);
1915         struct mdt_body *body = md->body;
1916         struct ll_sb_info *sbi = ll_i2sbi(inode);
1917         int rc = 0;
1918
1919         if (body->mbo_valid & OBD_MD_FLEASIZE) {
1920                 rc = cl_file_inode_init(inode, md);
1921                 if (rc)
1922                         return rc;
1923         }
1924
1925         if (S_ISDIR(inode->i_mode)) {
1926                 rc = ll_update_lsm_md(inode, md);
1927                 if (rc != 0)
1928                         return rc;
1929         }
1930
1931 #ifdef CONFIG_FS_POSIX_ACL
1932         if (body->mbo_valid & OBD_MD_FLACL) {
1933                 spin_lock(&lli->lli_lock);
1934                 if (lli->lli_posix_acl)
1935                         posix_acl_release(lli->lli_posix_acl);
1936                 lli->lli_posix_acl = md->posix_acl;
1937                 spin_unlock(&lli->lli_lock);
1938         }
1939 #endif
1940         inode->i_ino = cl_fid_build_ino(&body->mbo_fid1,
1941                                         sbi->ll_flags & LL_SBI_32BIT_API);
1942         inode->i_generation = cl_fid_build_gen(&body->mbo_fid1);
1943
1944         if (body->mbo_valid & OBD_MD_FLATIME) {
1945                 if (body->mbo_atime > LTIME_S(inode->i_atime))
1946                         LTIME_S(inode->i_atime) = body->mbo_atime;
1947                 lli->lli_atime = body->mbo_atime;
1948         }
1949
1950         if (body->mbo_valid & OBD_MD_FLMTIME) {
1951                 if (body->mbo_mtime > LTIME_S(inode->i_mtime)) {
1952                         CDEBUG(D_INODE, "setting ino %lu mtime from %lu "
1953                                "to %llu\n", inode->i_ino,
1954                                LTIME_S(inode->i_mtime), body->mbo_mtime);
1955                         LTIME_S(inode->i_mtime) = body->mbo_mtime;
1956                 }
1957                 lli->lli_mtime = body->mbo_mtime;
1958         }
1959
1960         if (body->mbo_valid & OBD_MD_FLCTIME) {
1961                 if (body->mbo_ctime > LTIME_S(inode->i_ctime))
1962                         LTIME_S(inode->i_ctime) = body->mbo_ctime;
1963                 lli->lli_ctime = body->mbo_ctime;
1964         }
1965
1966         /* Clear i_flags to remove S_NOSEC before permissions are updated */
1967         if (body->mbo_valid & OBD_MD_FLFLAGS)
1968                 ll_update_inode_flags(inode, body->mbo_flags);
1969         if (body->mbo_valid & OBD_MD_FLMODE)
1970                 inode->i_mode = (inode->i_mode & S_IFMT) |
1971                                 (body->mbo_mode & ~S_IFMT);
1972
1973         if (body->mbo_valid & OBD_MD_FLTYPE)
1974                 inode->i_mode = (inode->i_mode & ~S_IFMT) |
1975                                 (body->mbo_mode & S_IFMT);
1976
1977         LASSERT(inode->i_mode != 0);
1978         if (S_ISREG(inode->i_mode))
1979                 inode->i_blkbits = min(PTLRPC_MAX_BRW_BITS + 1,
1980                                        LL_MAX_BLKSIZE_BITS);
1981         else
1982                 inode->i_blkbits = inode->i_sb->s_blocksize_bits;
1983
1984         if (body->mbo_valid & OBD_MD_FLUID)
1985                 inode->i_uid = make_kuid(&init_user_ns, body->mbo_uid);
1986         if (body->mbo_valid & OBD_MD_FLGID)
1987                 inode->i_gid = make_kgid(&init_user_ns, body->mbo_gid);
1988         if (body->mbo_valid & OBD_MD_FLPROJID)
1989                 lli->lli_projid = body->mbo_projid;
1990         if (body->mbo_valid & OBD_MD_FLNLINK)
1991                 set_nlink(inode, body->mbo_nlink);
1992         if (body->mbo_valid & OBD_MD_FLRDEV)
1993                 inode->i_rdev = old_decode_dev(body->mbo_rdev);
1994
1995         if (body->mbo_valid & OBD_MD_FLID) {
1996                 /* FID shouldn't be changed! */
1997                 if (fid_is_sane(&lli->lli_fid)) {
1998                         LASSERTF(lu_fid_eq(&lli->lli_fid, &body->mbo_fid1),
1999                                  "Trying to change FID "DFID
2000                                  " to the "DFID", inode "DFID"(%p)\n",
2001                                  PFID(&lli->lli_fid), PFID(&body->mbo_fid1),
2002                                  PFID(ll_inode2fid(inode)), inode);
2003                 } else {
2004                         lli->lli_fid = body->mbo_fid1;
2005                 }
2006         }
2007
2008         LASSERT(fid_seq(&lli->lli_fid) != 0);
2009
2010         if (body->mbo_valid & OBD_MD_FLSIZE) {
2011                 i_size_write(inode, body->mbo_size);
2012
2013                 CDEBUG(D_VFSTRACE, "inode="DFID", updating i_size %llu\n",
2014                        PFID(ll_inode2fid(inode)),
2015                        (unsigned long long)body->mbo_size);
2016
2017                 if (body->mbo_valid & OBD_MD_FLBLOCKS)
2018                         inode->i_blocks = body->mbo_blocks;
2019         }
2020
2021         if (body->mbo_valid & OBD_MD_TSTATE) {
2022                 /* Set LLIF_FILE_RESTORING if restore ongoing and
2023                  * clear it when done to ensure to start again
2024                  * glimpsing updated attrs
2025                  */
2026                 if (body->mbo_t_state & MS_RESTORE)
2027                         ll_file_set_flag(lli, LLIF_FILE_RESTORING);
2028                 else
2029                         ll_file_clear_flag(lli, LLIF_FILE_RESTORING);
2030         }
2031
2032         return 0;
2033 }
2034
2035 int ll_read_inode2(struct inode *inode, void *opaque)
2036 {
2037         struct lustre_md *md = opaque;
2038         struct ll_inode_info *lli = ll_i2info(inode);
2039         int     rc;
2040         ENTRY;
2041
2042         CDEBUG(D_VFSTRACE, "VFS Op:inode="DFID"(%p)\n",
2043                PFID(&lli->lli_fid), inode);
2044
2045         /* Core attributes from the MDS first.  This is a new inode, and
2046          * the VFS doesn't zero times in the core inode so we have to do
2047          * it ourselves.  They will be overwritten by either MDS or OST
2048          * attributes - we just need to make sure they aren't newer. */
2049         LTIME_S(inode->i_mtime) = 0;
2050         LTIME_S(inode->i_atime) = 0;
2051         LTIME_S(inode->i_ctime) = 0;
2052         inode->i_rdev = 0;
2053         rc = ll_update_inode(inode, md);
2054         if (rc != 0)
2055                 RETURN(rc);
2056
2057         /* OIDEBUG(inode); */
2058
2059 #ifdef HAVE_BACKING_DEV_INFO
2060         /* initializing backing dev info. */
2061         inode->i_mapping->backing_dev_info = &s2lsi(inode->i_sb)->lsi_bdi;
2062 #endif
2063         if (S_ISREG(inode->i_mode)) {
2064                 struct ll_sb_info *sbi = ll_i2sbi(inode);
2065                 inode->i_op = &ll_file_inode_operations;
2066                 inode->i_fop = sbi->ll_fop;
2067                 inode->i_mapping->a_ops = (struct address_space_operations *)&ll_aops;
2068                 EXIT;
2069         } else if (S_ISDIR(inode->i_mode)) {
2070                 inode->i_op = &ll_dir_inode_operations;
2071                 inode->i_fop = &ll_dir_operations;
2072                 EXIT;
2073         } else if (S_ISLNK(inode->i_mode)) {
2074                 inode->i_op = &ll_fast_symlink_inode_operations;
2075                 EXIT;
2076         } else {
2077                 inode->i_op = &ll_special_inode_operations;
2078
2079                 init_special_inode(inode, inode->i_mode,
2080                                    inode->i_rdev);
2081
2082                 EXIT;
2083         }
2084
2085         return 0;
2086 }
2087
2088 void ll_delete_inode(struct inode *inode)
2089 {
2090         struct ll_inode_info *lli = ll_i2info(inode);
2091         ENTRY;
2092
2093         if (S_ISREG(inode->i_mode) && lli->lli_clob != NULL)
2094                 /* It is last chance to write out dirty pages,
2095                  * otherwise we may lose data while umount */
2096                 cl_sync_file_range(inode, 0, OBD_OBJECT_EOF, CL_FSYNC_LOCAL, 1);
2097
2098         truncate_inode_pages_final(&inode->i_data);
2099
2100         LASSERTF(inode->i_data.nrpages == 0, "inode="DFID"(%p) nrpages=%lu, "
2101                  "see https://jira.hpdd.intel.com/browse/LU-118\n",
2102                  PFID(ll_inode2fid(inode)), inode, inode->i_data.nrpages);
2103
2104 #ifdef HAVE_SBOPS_EVICT_INODE
2105         ll_clear_inode(inode);
2106 #endif
2107         clear_inode(inode);
2108
2109         EXIT;
2110 }
2111
2112 int ll_iocontrol(struct inode *inode, struct file *file,
2113                  unsigned int cmd, unsigned long arg)
2114 {
2115         struct ll_sb_info *sbi = ll_i2sbi(inode);
2116         struct ptlrpc_request *req = NULL;
2117         int rc, flags = 0;
2118         ENTRY;
2119
2120         switch (cmd) {
2121         case FS_IOC_GETFLAGS: {
2122                 struct mdt_body *body;
2123                 struct md_op_data *op_data;
2124
2125                 op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL,
2126                                              0, 0, LUSTRE_OPC_ANY,
2127                                              NULL);
2128                 if (IS_ERR(op_data))
2129                         RETURN(PTR_ERR(op_data));
2130
2131                 op_data->op_valid = OBD_MD_FLFLAGS;
2132                 rc = md_getattr(sbi->ll_md_exp, op_data, &req);
2133                 ll_finish_md_op_data(op_data);
2134                 if (rc) {
2135                         CERROR("%s: failure inode "DFID": rc = %d\n",
2136                                sbi->ll_md_exp->exp_obd->obd_name,
2137                                PFID(ll_inode2fid(inode)), rc);
2138                         RETURN(-abs(rc));
2139                 }
2140
2141                 body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
2142
2143                 flags = body->mbo_flags;
2144
2145                 ptlrpc_req_finished(req);
2146
2147                 RETURN(put_user(flags, (int __user *)arg));
2148         }
2149         case FS_IOC_SETFLAGS: {
2150                 struct iattr *attr;
2151                 struct md_op_data *op_data;
2152                 struct cl_object *obj;
2153
2154                 if (get_user(flags, (int __user *)arg))
2155                         RETURN(-EFAULT);
2156
2157                 op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
2158                                              LUSTRE_OPC_ANY, NULL);
2159                 if (IS_ERR(op_data))
2160                         RETURN(PTR_ERR(op_data));
2161
2162                 op_data->op_attr_flags = flags;
2163                 op_data->op_attr.ia_valid |= ATTR_ATTR_FLAG;
2164                 rc = md_setattr(sbi->ll_md_exp, op_data, NULL, 0, &req);
2165                 ll_finish_md_op_data(op_data);
2166                 ptlrpc_req_finished(req);
2167                 if (rc)
2168                         RETURN(rc);
2169
2170                 ll_update_inode_flags(inode, flags);
2171
2172                 obj = ll_i2info(inode)->lli_clob;
2173                 if (obj == NULL)
2174                         RETURN(0);
2175
2176                 OBD_ALLOC_PTR(attr);
2177                 if (attr == NULL)
2178                         RETURN(-ENOMEM);
2179
2180                 attr->ia_valid = ATTR_ATTR_FLAG;
2181                 rc = cl_setattr_ost(obj, attr, flags);
2182
2183                 OBD_FREE_PTR(attr);
2184                 RETURN(rc);
2185         }
2186         default:
2187                 RETURN(-ENOSYS);
2188         }
2189
2190         RETURN(0);
2191 }
2192
2193 int ll_flush_ctx(struct inode *inode)
2194 {
2195         struct ll_sb_info  *sbi = ll_i2sbi(inode);
2196
2197         CDEBUG(D_SEC, "flush context for user %d\n",
2198                from_kuid(&init_user_ns, current_uid()));
2199
2200         obd_set_info_async(NULL, sbi->ll_md_exp,
2201                            sizeof(KEY_FLUSH_CTX), KEY_FLUSH_CTX,
2202                            0, NULL, NULL);
2203         obd_set_info_async(NULL, sbi->ll_dt_exp,
2204                            sizeof(KEY_FLUSH_CTX), KEY_FLUSH_CTX,
2205                            0, NULL, NULL);
2206         return 0;
2207 }
2208
2209 /* umount -f client means force down, don't save state */
2210 void ll_umount_begin(struct super_block *sb)
2211 {
2212         struct ll_sb_info *sbi = ll_s2sbi(sb);
2213         struct obd_device *obd;
2214         struct obd_ioctl_data *ioc_data;
2215         struct l_wait_info lwi;
2216         wait_queue_head_t waitq;
2217         ENTRY;
2218
2219         CDEBUG(D_VFSTRACE, "VFS Op: superblock %p count %d active %d\n", sb,
2220                sb->s_count, atomic_read(&sb->s_active));
2221
2222         obd = class_exp2obd(sbi->ll_md_exp);
2223         if (obd == NULL) {
2224                 CERROR("Invalid MDC connection handle %#llx\n",
2225                        sbi->ll_md_exp->exp_handle.h_cookie);
2226                 EXIT;
2227                 return;
2228         }
2229         obd->obd_force = 1;
2230
2231         obd = class_exp2obd(sbi->ll_dt_exp);
2232         if (obd == NULL) {
2233                 CERROR("Invalid LOV connection handle %#llx\n",
2234                        sbi->ll_dt_exp->exp_handle.h_cookie);
2235                 EXIT;
2236                 return;
2237         }
2238         obd->obd_force = 1;
2239
2240         OBD_ALLOC_PTR(ioc_data);
2241         if (ioc_data) {
2242                 obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_md_exp,
2243                               sizeof *ioc_data, ioc_data, NULL);
2244
2245                 obd_iocontrol(IOC_OSC_SET_ACTIVE, sbi->ll_dt_exp,
2246                               sizeof *ioc_data, ioc_data, NULL);
2247
2248                 OBD_FREE_PTR(ioc_data);
2249         }
2250
2251         /* Really, we'd like to wait until there are no requests outstanding,
2252          * and then continue.  For now, we just periodically checking for vfs
2253          * to decrement mnt_cnt and hope to finish it within 10sec.
2254          */
2255         init_waitqueue_head(&waitq);
2256         lwi = LWI_TIMEOUT_INTERVAL(cfs_time_seconds(10),
2257                                    cfs_time_seconds(1), NULL, NULL);
2258         l_wait_event(waitq, may_umount(sbi->ll_mnt.mnt), &lwi);
2259
2260         EXIT;
2261 }
2262
2263 int ll_remount_fs(struct super_block *sb, int *flags, char *data)
2264 {
2265         struct ll_sb_info *sbi = ll_s2sbi(sb);
2266         char *profilenm = get_profile_name(sb);
2267         int err;
2268         __u32 read_only;
2269
2270         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
2271                 read_only = *flags & MS_RDONLY;
2272                 err = obd_set_info_async(NULL, sbi->ll_md_exp,
2273                                          sizeof(KEY_READ_ONLY),
2274                                          KEY_READ_ONLY, sizeof(read_only),
2275                                          &read_only, NULL);
2276                 if (err) {
2277                         LCONSOLE_WARN("Failed to remount %s %s (%d)\n",
2278                                       profilenm, read_only ?
2279                                       "read-only" : "read-write", err);
2280                         return err;
2281                 }
2282
2283                 if (read_only)
2284                         sb->s_flags |= MS_RDONLY;
2285                 else
2286                         sb->s_flags &= ~MS_RDONLY;
2287
2288                 if (sbi->ll_flags & LL_SBI_VERBOSE)
2289                         LCONSOLE_WARN("Remounted %s %s\n", profilenm,
2290                                       read_only ?  "read-only" : "read-write");
2291         }
2292         return 0;
2293 }
2294
2295 /**
2296  * Cleanup the open handle that is cached on MDT-side.
2297  *
2298  * For open case, the client side open handling thread may hit error
2299  * after the MDT grant the open. Under such case, the client should
2300  * send close RPC to the MDT as cleanup; otherwise, the open handle
2301  * on the MDT will be leaked there until the client umount or evicted.
2302  *
2303  * In further, if someone unlinked the file, because the open handle
2304  * holds the reference on such file/object, then it will block the
2305  * subsequent threads that want to locate such object via FID.
2306  *
2307  * \param[in] sb        super block for this file-system
2308  * \param[in] open_req  pointer to the original open request
2309  */
2310 void ll_open_cleanup(struct super_block *sb, struct ptlrpc_request *open_req)
2311 {
2312         struct mdt_body                 *body;
2313         struct md_op_data               *op_data;
2314         struct ptlrpc_request           *close_req = NULL;
2315         struct obd_export               *exp       = ll_s2sbi(sb)->ll_md_exp;
2316         ENTRY;
2317
2318         body = req_capsule_server_get(&open_req->rq_pill, &RMF_MDT_BODY);
2319         OBD_ALLOC_PTR(op_data);
2320         if (op_data == NULL) {
2321                 CWARN("%s: cannot allocate op_data to release open handle for "
2322                       DFID"\n",
2323                       ll_get_fsname(sb, NULL, 0), PFID(&body->mbo_fid1));
2324
2325                 RETURN_EXIT;
2326         }
2327
2328         op_data->op_fid1 = body->mbo_fid1;
2329         op_data->op_handle = body->mbo_handle;
2330         op_data->op_mod_time = ktime_get_real_seconds();
2331         md_close(exp, op_data, NULL, &close_req);
2332         ptlrpc_req_finished(close_req);
2333         ll_finish_md_op_data(op_data);
2334
2335         EXIT;
2336 }
2337
2338 int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
2339                   struct super_block *sb, struct lookup_intent *it)
2340 {
2341         struct ll_sb_info *sbi = NULL;
2342         struct lustre_md md = { NULL };
2343         int rc;
2344         ENTRY;
2345
2346         LASSERT(*inode || sb);
2347         sbi = sb ? ll_s2sbi(sb) : ll_i2sbi(*inode);
2348         rc = md_get_lustre_md(sbi->ll_md_exp, req, sbi->ll_dt_exp,
2349                               sbi->ll_md_exp, &md);
2350         if (rc != 0)
2351                 GOTO(cleanup, rc);
2352
2353         if (*inode) {
2354                 rc = ll_update_inode(*inode, &md);
2355                 if (rc != 0)
2356                         GOTO(out, rc);
2357         } else {
2358                 LASSERT(sb != NULL);
2359
2360                 /*
2361                  * At this point server returns to client's same fid as client
2362                  * generated for creating. So using ->fid1 is okay here.
2363                  */
2364                 if (!fid_is_sane(&md.body->mbo_fid1)) {
2365                         CERROR("%s: Fid is insane "DFID"\n",
2366                                 ll_get_fsname(sb, NULL, 0),
2367                                 PFID(&md.body->mbo_fid1));
2368                         GOTO(out, rc = -EINVAL);
2369                 }
2370
2371                 *inode = ll_iget(sb, cl_fid_build_ino(&md.body->mbo_fid1,
2372                                              sbi->ll_flags & LL_SBI_32BIT_API),
2373                                  &md);
2374                 if (IS_ERR(*inode)) {
2375 #ifdef CONFIG_FS_POSIX_ACL
2376                         if (md.posix_acl) {
2377                                 posix_acl_release(md.posix_acl);
2378                                 md.posix_acl = NULL;
2379                         }
2380 #endif
2381                         rc = IS_ERR(*inode) ? PTR_ERR(*inode) : -ENOMEM;
2382                         *inode = NULL;
2383                         CERROR("new_inode -fatal: rc %d\n", rc);
2384                         GOTO(out, rc);
2385                 }
2386         }
2387
2388         /* Handling piggyback layout lock.
2389          * Layout lock can be piggybacked by getattr and open request.
2390          * The lsm can be applied to inode only if it comes with a layout lock
2391          * otherwise correct layout may be overwritten, for example:
2392          * 1. proc1: mdt returns a lsm but not granting layout
2393          * 2. layout was changed by another client
2394          * 3. proc2: refresh layout and layout lock granted
2395          * 4. proc1: to apply a stale layout */
2396         if (it != NULL && it->it_lock_mode != 0) {
2397                 struct lustre_handle lockh;
2398                 struct ldlm_lock *lock;
2399
2400                 lockh.cookie = it->it_lock_handle;
2401                 lock = ldlm_handle2lock(&lockh);
2402                 LASSERT(lock != NULL);
2403                 if (ldlm_has_layout(lock)) {
2404                         struct cl_object_conf conf;
2405
2406                         memset(&conf, 0, sizeof(conf));
2407                         conf.coc_opc = OBJECT_CONF_SET;
2408                         conf.coc_inode = *inode;
2409                         conf.coc_lock = lock;
2410                         conf.u.coc_layout = md.layout;
2411                         (void)ll_layout_conf(*inode, &conf);
2412                 }
2413                 LDLM_LOCK_PUT(lock);
2414         }
2415
2416         GOTO(out, rc = 0);
2417
2418 out:
2419         md_free_lustre_md(sbi->ll_md_exp, &md);
2420
2421 cleanup:
2422         if (rc != 0 && it != NULL && it->it_op & IT_OPEN)
2423                 ll_open_cleanup(sb != NULL ? sb : (*inode)->i_sb, req);
2424
2425         return rc;
2426 }
2427
2428 int ll_obd_statfs(struct inode *inode, void __user *arg)
2429 {
2430         struct ll_sb_info *sbi = NULL;
2431         struct obd_export *exp;
2432         char *buf = NULL;
2433         struct obd_ioctl_data *data = NULL;
2434         __u32 type;
2435         int len = 0, rc;
2436
2437         if (!inode || !(sbi = ll_i2sbi(inode)))
2438                 GOTO(out_statfs, rc = -EINVAL);
2439
2440         rc = obd_ioctl_getdata(&buf, &len, arg);
2441         if (rc)
2442                 GOTO(out_statfs, rc);
2443
2444         data = (void*)buf;
2445         if (!data->ioc_inlbuf1 || !data->ioc_inlbuf2 ||
2446             !data->ioc_pbuf1 || !data->ioc_pbuf2)
2447                 GOTO(out_statfs, rc = -EINVAL);
2448
2449         if (data->ioc_inllen1 != sizeof(__u32) ||
2450             data->ioc_inllen2 != sizeof(__u32) ||
2451             data->ioc_plen1 != sizeof(struct obd_statfs) ||
2452             data->ioc_plen2 != sizeof(struct obd_uuid))
2453                 GOTO(out_statfs, rc = -EINVAL);
2454
2455         memcpy(&type, data->ioc_inlbuf1, sizeof(__u32));
2456         if (type & LL_STATFS_LMV)
2457                 exp = sbi->ll_md_exp;
2458         else if (type & LL_STATFS_LOV)
2459                 exp = sbi->ll_dt_exp;
2460         else
2461                 GOTO(out_statfs, rc = -ENODEV);
2462
2463         rc = obd_iocontrol(IOC_OBD_STATFS, exp, len, buf, NULL);
2464         if (rc)
2465                 GOTO(out_statfs, rc);
2466 out_statfs:
2467         OBD_FREE_LARGE(buf, len);
2468         return rc;
2469 }
2470
2471 /* this function prepares md_op_data hint for passing it down to MD stack. */
2472 struct md_op_data *ll_prep_md_op_data(struct md_op_data *op_data,
2473                                       struct inode *i1, struct inode *i2,
2474                                       const char *name, size_t namelen,
2475                                       __u32 mode, __u32 opc, void *data)
2476 {
2477         LASSERT(i1 != NULL);
2478
2479         if (name == NULL) {
2480                 /* Do not reuse namelen for something else. */
2481                 if (namelen != 0)
2482                         return ERR_PTR(-EINVAL);
2483         } else {
2484                 if (namelen > ll_i2sbi(i1)->ll_namelen)
2485                         return ERR_PTR(-ENAMETOOLONG);
2486
2487                 if (!lu_name_is_valid_2(name, namelen))
2488                         return ERR_PTR(-EINVAL);
2489         }
2490
2491         if (op_data == NULL)
2492                 OBD_ALLOC_PTR(op_data);
2493
2494         if (op_data == NULL)
2495                 return ERR_PTR(-ENOMEM);
2496
2497         ll_i2gids(op_data->op_suppgids, i1, i2);
2498         op_data->op_fid1 = *ll_inode2fid(i1);
2499         op_data->op_default_stripe_offset = -1;
2500         if (S_ISDIR(i1->i_mode)) {
2501                 op_data->op_mea1 = ll_i2info(i1)->lli_lsm_md;
2502                 if (opc == LUSTRE_OPC_MKDIR)
2503                         op_data->op_default_stripe_offset =
2504                                    ll_i2info(i1)->lli_def_stripe_offset;
2505         }
2506
2507         if (i2) {
2508                 op_data->op_fid2 = *ll_inode2fid(i2);
2509                 if (S_ISDIR(i2->i_mode))
2510                         op_data->op_mea2 = ll_i2info(i2)->lli_lsm_md;
2511         } else {
2512                 fid_zero(&op_data->op_fid2);
2513         }
2514
2515         if (ll_i2sbi(i1)->ll_flags & LL_SBI_64BIT_HASH)
2516                 op_data->op_cli_flags |= CLI_HASH64;
2517
2518         if (ll_need_32bit_api(ll_i2sbi(i1)))
2519                 op_data->op_cli_flags |= CLI_API32;
2520
2521         op_data->op_name = name;
2522         op_data->op_namelen = namelen;
2523         op_data->op_mode = mode;
2524         op_data->op_mod_time = ktime_get_real_seconds();
2525         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2526         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2527         op_data->op_cap = cfs_curproc_cap_pack();
2528         op_data->op_mds = 0;
2529         if ((opc == LUSTRE_OPC_CREATE) && (name != NULL) &&
2530              filename_is_volatile(name, namelen, &op_data->op_mds)) {
2531                 op_data->op_bias |= MDS_CREATE_VOLATILE;
2532         }
2533         op_data->op_data = data;
2534
2535         return op_data;
2536 }
2537
2538 void ll_finish_md_op_data(struct md_op_data *op_data)
2539 {
2540         security_release_secctx(op_data->op_file_secctx,
2541                                 op_data->op_file_secctx_size);
2542         OBD_FREE_PTR(op_data);
2543 }
2544
2545 #ifdef HAVE_SUPEROPS_USE_DENTRY
2546 int ll_show_options(struct seq_file *seq, struct dentry *dentry)
2547 #else
2548 int ll_show_options(struct seq_file *seq, struct vfsmount *vfs)
2549 #endif
2550 {
2551         struct ll_sb_info *sbi;
2552
2553 #ifdef HAVE_SUPEROPS_USE_DENTRY
2554         LASSERT((seq != NULL) && (dentry != NULL));
2555         sbi = ll_s2sbi(dentry->d_sb);
2556 #else
2557         LASSERT((seq != NULL) && (vfs != NULL));
2558         sbi = ll_s2sbi(vfs->mnt_sb);
2559 #endif
2560
2561         if (sbi->ll_flags & LL_SBI_NOLCK)
2562                 seq_puts(seq, ",nolock");
2563
2564         if (sbi->ll_flags & LL_SBI_FLOCK)
2565                 seq_puts(seq, ",flock");
2566
2567         if (sbi->ll_flags & LL_SBI_LOCALFLOCK)
2568                 seq_puts(seq, ",localflock");
2569
2570         if (sbi->ll_flags & LL_SBI_USER_XATTR)
2571                 seq_puts(seq, ",user_xattr");
2572
2573         if (sbi->ll_flags & LL_SBI_LAZYSTATFS)
2574                 seq_puts(seq, ",lazystatfs");
2575
2576         if (sbi->ll_flags & LL_SBI_USER_FID2PATH)
2577                 seq_puts(seq, ",user_fid2path");
2578
2579         if (sbi->ll_flags & LL_SBI_ALWAYS_PING)
2580                 seq_puts(seq, ",always_ping");
2581
2582         RETURN(0);
2583 }
2584
2585 /**
2586  * Get obd name by cmd, and copy out to user space
2587  */
2588 int ll_get_obd_name(struct inode *inode, unsigned int cmd, unsigned long arg)
2589 {
2590         struct ll_sb_info *sbi = ll_i2sbi(inode);
2591         struct obd_device *obd;
2592         ENTRY;
2593
2594         if (cmd == OBD_IOC_GETDTNAME)
2595                 obd = class_exp2obd(sbi->ll_dt_exp);
2596         else if (cmd == OBD_IOC_GETMDNAME)
2597                 obd = class_exp2obd(sbi->ll_md_exp);
2598         else
2599                 RETURN(-EINVAL);
2600
2601         if (!obd)
2602                 RETURN(-ENOENT);
2603
2604         if (copy_to_user((void __user *)arg, obd->obd_name,
2605                          strlen(obd->obd_name) + 1))
2606                 RETURN(-EFAULT);
2607
2608         RETURN(0);
2609 }
2610
2611 /**
2612  * Get lustre file system name by \a sbi. If \a buf is provided(non-NULL), the
2613  * fsname will be returned in this buffer; otherwise, a static buffer will be
2614  * used to store the fsname and returned to caller.
2615  */
2616 char *ll_get_fsname(struct super_block *sb, char *buf, int buflen)
2617 {
2618         static char fsname_static[MTI_NAME_MAXLEN];
2619         struct lustre_sb_info *lsi = s2lsi(sb);
2620         char *ptr;
2621         int len;
2622
2623         if (buf == NULL) {
2624                 /* this means the caller wants to use static buffer
2625                  * and it doesn't care about race. Usually this is
2626                  * in error reporting path */
2627                 buf = fsname_static;
2628                 buflen = sizeof(fsname_static);
2629         }
2630
2631         len = strlen(lsi->lsi_lmd->lmd_profile);
2632         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
2633         if (ptr && (strcmp(ptr, "-client") == 0))
2634                 len -= 7;
2635
2636         if (unlikely(len >= buflen))
2637                 len = buflen - 1;
2638         strncpy(buf, lsi->lsi_lmd->lmd_profile, len);
2639         buf[len] = '\0';
2640
2641         return buf;
2642 }
2643
2644 static char* ll_d_path(struct dentry *dentry, char *buf, int bufsize)
2645 {
2646         char *path = NULL;
2647
2648         struct path p;
2649
2650         p.dentry = dentry;
2651         p.mnt = current->fs->root.mnt;
2652         path_get(&p);
2653         path = d_path(&p, buf, bufsize);
2654         path_put(&p);
2655         return path;
2656 }
2657
2658 void ll_dirty_page_discard_warn(struct page *page, int ioret)
2659 {
2660         char *buf, *path = NULL;
2661         struct dentry *dentry = NULL;
2662         struct inode *inode = page->mapping->host;
2663
2664         /* this can be called inside spin lock so use GFP_ATOMIC. */
2665         buf = (char *)__get_free_page(GFP_ATOMIC);
2666         if (buf != NULL) {
2667                 dentry = d_find_alias(page->mapping->host);
2668                 if (dentry != NULL)
2669                         path = ll_d_path(dentry, buf, PAGE_SIZE);
2670         }
2671
2672         CDEBUG(D_WARNING,
2673                "%s: dirty page discard: %s/fid: "DFID"/%s may get corrupted "
2674                "(rc %d)\n", ll_get_fsname(page->mapping->host->i_sb, NULL, 0),
2675                s2lsi(page->mapping->host->i_sb)->lsi_lmd->lmd_dev,
2676                PFID(ll_inode2fid(inode)),
2677                (path && !IS_ERR(path)) ? path : "", ioret);
2678
2679         if (dentry != NULL)
2680                 dput(dentry);
2681
2682         if (buf != NULL)
2683                 free_page((unsigned long)buf);
2684 }
2685
2686 ssize_t ll_copy_user_md(const struct lov_user_md __user *md,
2687                         struct lov_user_md **kbuf)
2688 {
2689         struct lov_user_md      lum;
2690         ssize_t                 lum_size;
2691         ENTRY;
2692
2693         if (copy_from_user(&lum, md, sizeof(lum)))
2694                 RETURN(-EFAULT);
2695
2696         lum_size = ll_lov_user_md_size(&lum);
2697         if (lum_size < 0)
2698                 RETURN(lum_size);
2699
2700         OBD_ALLOC(*kbuf, lum_size);
2701         if (*kbuf == NULL)
2702                 RETURN(-ENOMEM);
2703
2704         if (copy_from_user(*kbuf, md, lum_size) != 0) {
2705                 OBD_FREE(*kbuf, lum_size);
2706                 RETURN(-EFAULT);
2707         }
2708
2709         RETURN(lum_size);
2710 }
2711
2712 /*
2713  * Compute llite root squash state after a change of root squash
2714  * configuration setting or add/remove of a lnet nid
2715  */
2716 void ll_compute_rootsquash_state(struct ll_sb_info *sbi)
2717 {
2718         struct root_squash_info *squash = &sbi->ll_squash;
2719         int i;
2720         bool matched;
2721         struct lnet_process_id id;
2722
2723         /* Update norootsquash flag */
2724         down_write(&squash->rsi_sem);
2725         if (list_empty(&squash->rsi_nosquash_nids))
2726                 sbi->ll_flags &= ~LL_SBI_NOROOTSQUASH;
2727         else {
2728                 /* Do not apply root squash as soon as one of our NIDs is
2729                  * in the nosquash_nids list */
2730                 matched = false;
2731                 i = 0;
2732                 while (LNetGetId(i++, &id) != -ENOENT) {
2733                         if (LNET_NETTYP(LNET_NIDNET(id.nid)) == LOLND)
2734                                 continue;
2735                         if (cfs_match_nid(id.nid, &squash->rsi_nosquash_nids)) {
2736                                 matched = true;
2737                                 break;
2738                         }
2739                 }
2740                 if (matched)
2741                         sbi->ll_flags |= LL_SBI_NOROOTSQUASH;
2742                 else
2743                         sbi->ll_flags &= ~LL_SBI_NOROOTSQUASH;
2744         }
2745         up_write(&squash->rsi_sem);
2746 }
2747
2748 /**
2749  * Parse linkea content to extract information about a given hardlink
2750  *
2751  * \param[in]   ldata      - Initialized linkea data
2752  * \param[in]   linkno     - Link identifier
2753  * \param[out]  parent_fid - The entry's parent FID
2754  * \param[out]  ln         - Entry name destination buffer
2755  *
2756  * \retval 0 on success
2757  * \retval Appropriate negative error code on failure
2758  */
2759 static int ll_linkea_decode(struct linkea_data *ldata, unsigned int linkno,
2760                             struct lu_fid *parent_fid, struct lu_name *ln)
2761 {
2762         unsigned int    idx;
2763         int             rc;
2764         ENTRY;
2765
2766         rc = linkea_init_with_rec(ldata);
2767         if (rc < 0)
2768                 RETURN(rc);
2769
2770         if (linkno >= ldata->ld_leh->leh_reccount)
2771                 /* beyond last link */
2772                 RETURN(-ENODATA);
2773
2774         linkea_first_entry(ldata);
2775         for (idx = 0; ldata->ld_lee != NULL; idx++) {
2776                 linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen, ln,
2777                                     parent_fid);
2778                 if (idx == linkno)
2779                         break;
2780
2781                 linkea_next_entry(ldata);
2782         }
2783
2784         if (idx < linkno)
2785                 RETURN(-ENODATA);
2786
2787         RETURN(0);
2788 }
2789
2790 /**
2791  * Get parent FID and name of an identified link. Operation is performed for
2792  * a given link number, letting the caller iterate over linkno to list one or
2793  * all links of an entry.
2794  *
2795  * \param[in]     file - File descriptor against which to perform the operation
2796  * \param[in,out] arg  - User-filled structure containing the linkno to operate
2797  *                       on and the available size. It is eventually filled with
2798  *                       the requested information or left untouched on error
2799  *
2800  * \retval - 0 on success
2801  * \retval - Appropriate negative error code on failure
2802  */
2803 int ll_getparent(struct file *file, struct getparent __user *arg)
2804 {
2805         struct inode            *inode = file_inode(file);
2806         struct linkea_data      *ldata;
2807         struct lu_buf            buf = LU_BUF_NULL;
2808         struct lu_name           ln;
2809         struct lu_fid            parent_fid;
2810         __u32                    linkno;
2811         __u32                    name_size;
2812         int                      rc;
2813
2814         ENTRY;
2815
2816         if (!cfs_capable(CFS_CAP_DAC_READ_SEARCH) &&
2817             !(ll_i2sbi(inode)->ll_flags & LL_SBI_USER_FID2PATH))
2818                 RETURN(-EPERM);
2819
2820         if (get_user(name_size, &arg->gp_name_size))
2821                 RETURN(-EFAULT);
2822
2823         if (get_user(linkno, &arg->gp_linkno))
2824                 RETURN(-EFAULT);
2825
2826         if (name_size > PATH_MAX)
2827                 RETURN(-EINVAL);
2828
2829         OBD_ALLOC(ldata, sizeof(*ldata));
2830         if (ldata == NULL)
2831                 RETURN(-ENOMEM);
2832
2833         rc = linkea_data_new(ldata, &buf);
2834         if (rc < 0)
2835                 GOTO(ldata_free, rc);
2836
2837 #ifdef HAVE_XATTR_HANDLER_FLAGS
2838         rc = ll_xattr_list(inode, XATTR_NAME_LINK, XATTR_TRUSTED_T, buf.lb_buf,
2839                            buf.lb_len, OBD_MD_FLXATTR);
2840 #else
2841         rc = ll_getxattr(file_dentry(file), XATTR_NAME_LINK, buf.lb_buf,
2842                          buf.lb_len);
2843 #endif /* HAVE_XATTR_HANDLER_FLAGS */
2844         if (rc < 0)
2845                 GOTO(lb_free, rc);
2846
2847         rc = ll_linkea_decode(ldata, linkno, &parent_fid, &ln);
2848         if (rc < 0)
2849                 GOTO(lb_free, rc);
2850
2851         if (ln.ln_namelen >= name_size)
2852                 GOTO(lb_free, rc = -EOVERFLOW);
2853
2854         if (copy_to_user(&arg->gp_fid, &parent_fid, sizeof(arg->gp_fid)))
2855                 GOTO(lb_free, rc = -EFAULT);
2856
2857         if (copy_to_user(&arg->gp_name, ln.ln_name, ln.ln_namelen))
2858                 GOTO(lb_free, rc = -EFAULT);
2859
2860         if (put_user('\0', arg->gp_name + ln.ln_namelen))
2861                 GOTO(lb_free, rc = -EFAULT);
2862
2863 lb_free:
2864         lu_buf_free(&buf);
2865 ldata_free:
2866         OBD_FREE(ldata, sizeof(*ldata));
2867
2868         RETURN(rc);
2869 }