lustre/llite/dir.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * Copyright (c) 2011 Whamcloud, Inc.
  34  */
  35 /*
  36  * This file is part of Lustre, http://www.lustre.org/
  37  * Lustre is a trademark of Sun Microsystems, Inc.
  38  *
  39  * lustre/llite/dir.c
  40  *
  41  * Directory code for lustre client.
  42  */
  43
  44 #include <linux/fs.h>
  45 #include <linux/pagemap.h>
  46 #include <linux/mm.h>
  47 #include <linux/version.h>
  48 #include <linux/smp_lock.h>
  49 #include <asm/uaccess.h>
  50 #include <linux/buffer_head.h>   // for wait_on_buffer
  51 #include <linux/pagevec.h>
  52
  53 #define DEBUG_SUBSYSTEM S_LLITE
  54
  55 #include <obd_support.h>
  56 #include <obd_class.h>
  57 #include <lustre_lib.h>
  58 #include <lustre/lustre_idl.h>
  59 #include <lustre_lite.h>
  60 #include <lustre_dlm.h>
  61 #include <lustre_fid.h>
  62 #include "llite_internal.h"
  63
  64 #ifndef HAVE_PAGE_CHECKED
  65 #ifdef HAVE_PG_FS_MISC
  66 #define PageChecked(page)        test_bit(PG_fs_misc, &(page)->flags)
  67 #define SetPageChecked(page)     set_bit(PG_fs_misc, &(page)->flags)
  68 #else
  69 #error PageChecked or PageFsMisc not defined in kernel
  70 #endif
  71 #endif
  72
  73 /*
  74  * (new) readdir implementation overview.
  75  *
  76  * Original lustre readdir implementation cached exact copy of raw directory
  77  * pages on the client. These pages were indexed in client page cache by
  78  * logical offset in the directory file. This design, while very simple and
  79  * intuitive had some inherent problems:
  80  *
  81  *     . it implies that byte offset to the directory entry serves as a
  82  *     telldir(3)/seekdir(3) cookie, but that offset is not stable: in
  83  *     ext3/htree directory entries may move due to splits, and more
  84  *     importantly,
  85  *
  86  *     . it is incompatible with the design of split directories for cmd3,
  87  *     that assumes that names are distributed across nodes based on their
  88  *     hash, and so readdir should be done in hash order.
  89  *
  90  * New readdir implementation does readdir in hash order, and uses hash of a
  91  * file name as a telldir/seekdir cookie. This led to number of complications:
  92  *
  93  *     . hash is not unique, so it cannot be used to index cached directory
  94  *     pages on the client (note, that it requires a whole pageful of hash
  95  *     collided entries to cause two pages to have identical hashes);
  96  *
  97  *     . hash is not unique, so it cannot, strictly speaking, be used as an
  98  *     entry cookie. ext3/htree has the same problem and lustre implementation
  99  *     mimics their solution: seekdir(hash) positions directory at the first
 100  *     entry with the given hash.
 101  *
 102  * Client side.
 103  *
 104  * 0. caching
 105  *
 106  * Client caches directory pages using hash of the first entry as an index. As
 107  * noted above hash is not unique, so this solution doesn't work as is:
 108  * special processing is needed for "page hash chains" (i.e., sequences of
 109  * pages filled with entries all having the same hash value).
 110  *
 111  * First, such chains have to be detected. To this end, server returns to the
 112  * client the hash of the first entry on the page next to one returned. When
 113  * client detects that this hash is the same as hash of the first entry on the
 114  * returned page, page hash collision has to be handled. Pages in the
 115  * hash chain, except first one, are termed "overflow pages".
 116  *
 117  * Solution to index uniqueness problem is to not cache overflow
 118  * pages. Instead, when page hash collision is detected, all overflow pages
 119  * from emerging chain are immediately requested from the server and placed in
 120  * a special data structure (struct ll_dir_chain). This data structure is used
 121  * by ll_readdir() to process entries from overflow pages. When readdir
 122  * invocation finishes, overflow pages are discarded. If page hash collision
 123  * chain weren't completely processed, next call to readdir will again detect
 124  * page hash collision, again read overflow pages in, process next portion of
 125  * entries and again discard the pages. This is not as wasteful as it looks,
 126  * because, given reasonable hash, page hash collisions are extremely rare.
 127  *
 128  * 1. directory positioning
 129  *
 130  * When seekdir(hash) is called, original
 131  *
 132  *
 133  *
 134  *
 135  *
 136  *
 137  *
 138  *
 139  * Server.
 140  *
 141  * identification of and access to overflow pages
 142  *
 143  * page format
 144  *
 145  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
 146  * a header lu_dirpage which describes the start/end hash, and whether this
 147  * page is empty (contains no dir entry) or hash collide with next page.
 148  * After client receives reply, several pages will be integrated into dir page
 149  * in CFS_PAGE_SIZE (if CFS_PAGE_SIZE greater than LU_PAGE_SIZE), and the
 150  * lu_dirpage for this integrated page will be adjusted.
 151  *
 152  */
 153
 154 /* returns the page unlocked, but with a reference */
 155 static int ll_dir_readpage(struct file *file, struct page *page0)
 156 {
 157         struct inode *inode = page0->mapping->host;
 158         int hash64 = ll_i2sbi(inode)->ll_flags & LL_SBI_64BIT_HASH;
 159         struct obd_export *exp = ll_i2sbi(inode)->ll_md_exp;
 160         struct ptlrpc_request *request;
 161         struct mdt_body *body;
 162         struct obd_capa *oc;
 163         __u64 hash;
 164         struct page **page_pool;
 165         struct page *page;
 166 #ifndef HAVE_ADD_TO_PAGE_CACHE_LRU
 167         struct pagevec lru_pvec;
 168 #endif
 169         struct lu_dirpage *dp;
 170         int max_pages = ll_i2sbi(inode)->ll_md_brw_size >> CFS_PAGE_SHIFT;
 171         int nrdpgs = 0; /* number of pages read actually */
 172         int npages;
 173         int i;
 174         int rc;
 175         ENTRY;
 176
 177         if (file) {
 178                 struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
 179
 180                 hash = fd->fd_dir.lfd_next;
 181         } else {
 182                 hash = ll_i2info(inode)->lli_sa_pos;
 183         }
 184         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) hash "LPU64"\n",
 185                inode->i_ino, inode->i_generation, inode, hash);
 186
 187         LASSERT(max_pages > 0 && max_pages <= PTLRPC_MAX_BRW_PAGES);
 188
 189         OBD_ALLOC(page_pool, sizeof(page) * max_pages);
 190         if (page_pool != NULL) {
 191                 page_pool[0] = page0;
 192         } else {
 193                 page_pool = &page0;
 194                 max_pages = 1;
 195         }
 196         for (npages = 1; npages < max_pages; npages++) {
 197                 page = page_cache_alloc_cold(inode->i_mapping);
 198                 if (!page)
 199                         break;
 200                 page_pool[npages] = page;
 201         }
 202
 203         oc = ll_mdscapa_get(inode);
 204         rc = md_readpage(exp, ll_inode2fid(inode), oc, hash, page_pool, npages,
 205                          &request);
 206         capa_put(oc);
 207         if (rc == 0) {
 208                 body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
 209                 /* Checked by mdc_readpage() */
 210                 LASSERT(body != NULL);
 211
 212                 if (body->valid & OBD_MD_FLSIZE)
 213                         cl_isize_write(inode, body->size);
 214
 215                 nrdpgs = (request->rq_bulk->bd_nob_transferred+CFS_PAGE_SIZE-1)
 216                          >> CFS_PAGE_SHIFT;
 217                 SetPageUptodate(page0);
 218         }
 219         unlock_page(page0);
 220         ptlrpc_req_finished(request);
 221
 222         CDEBUG(D_VFSTRACE, "read %d/%d pages\n", nrdpgs, npages);
 223
 224         ll_pagevec_init(&lru_pvec, 0);
 225         for (i = 1; i < npages; i++) {
 226                 unsigned long offset;
 227                 int ret;
 228
 229                 page = page_pool[i];
 230
 231                 if (rc < 0 || i >= nrdpgs) {
 232                         page_cache_release(page);
 233                         continue;
 234                 }
 235
 236                 SetPageUptodate(page);
 237
 238                 dp = cfs_kmap(page);
 239                 hash = le64_to_cpu(dp->ldp_hash_start);
 240                 cfs_kunmap(page);
 241
 242                 offset = hash_x_index(hash, hash64);
 243
 244                 prefetchw(&page->flags);
 245                 ret = ll_add_to_page_cache_lru(page, inode->i_mapping, offset,
 246                                                GFP_KERNEL);
 247                 if (ret == 0) {
 248                         unlock_page(page);
 249                         page_cache_get(page);
 250                         if (ll_pagevec_add(&lru_pvec, page) == 0)
 251                                 ll_pagevec_lru_add_file(&lru_pvec);
 252                 } else {
 253                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
 254                                " %d\n", offset, ret);
 255                 }
 256                 page_cache_release(page);
 257         }
 258         ll_pagevec_lru_add_file(&lru_pvec);
 259
 260         if (page_pool != &page0)
 261                 OBD_FREE(page_pool, sizeof(struct page *) * max_pages);
 262         EXIT;
 263         return rc;
 264 }
 265
 266 #ifndef MS_HAS_NEW_AOPS
 267 struct address_space_operations ll_dir_aops = {
 268         .readpage  = ll_dir_readpage,
 269 };
 270 #else
 271 struct address_space_operations_ext ll_dir_aops = {
 272         .orig_aops.readpage  = ll_dir_readpage,
 273 };
 274 #endif
 275
 276 static void ll_check_page(struct inode *dir, struct page *page)
 277 {
 278         /* XXX: check page format later */
 279         SetPageChecked(page);
 280 }
 281
 282 void ll_release_page(struct page *page, int remove)
 283 {
 284         kunmap(page);
 285         if (remove) {
 286                 lock_page(page);
 287                 if (likely(page->mapping != NULL))
 288                         truncate_complete_page(page->mapping, page);
 289                 unlock_page(page);
 290         }
 291         page_cache_release(page);
 292 }
 293
 294 /*
 295  * Find, kmap and return page that contains given hash.
 296  */
 297 static struct page *ll_dir_page_locate(struct inode *dir, __u64 *hash,
 298                                        __u64 *start, __u64 *end)
 299 {
 300         int hash64 = ll_i2sbi(dir)->ll_flags & LL_SBI_64BIT_HASH;
 301         struct address_space *mapping = dir->i_mapping;
 302         /*
 303          * Complement of hash is used as an index so that
 304          * radix_tree_gang_lookup() can be used to find a page with starting
 305          * hash _smaller_ than one we are looking for.
 306          */
 307         unsigned long offset = hash_x_index(*hash, hash64);
 308         struct page *page;
 309         int found;
 310
 311         TREE_READ_LOCK_IRQ(mapping);
 312         found = radix_tree_gang_lookup(&mapping->page_tree,
 313                                        (void **)&page, offset, 1);
 314         if (found > 0) {
 315                 struct lu_dirpage *dp;
 316
 317                 page_cache_get(page);
 318                 TREE_READ_UNLOCK_IRQ(mapping);
 319                 /*
 320                  * In contrast to find_lock_page() we are sure that directory
 321                  * page cannot be truncated (while DLM lock is held) and,
 322                  * hence, can avoid restart.
 323                  *
 324                  * In fact, page cannot be locked here at all, because
 325                  * ll_dir_readpage() does synchronous io.
 326                  */
 327                 wait_on_page(page);
 328                 if (PageUptodate(page)) {
 329                         dp = cfs_kmap(page);
 330                         if (BITS_PER_LONG == 32 && hash64) {
 331                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
 332                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
 333                                 *hash  = *hash >> 32;
 334                         } else {
 335                                 *start = le64_to_cpu(dp->ldp_hash_start);
 336                                 *end   = le64_to_cpu(dp->ldp_hash_end);
 337                         }
 338                         LASSERTF(*start <= *hash, "start = "LPX64",end = "
 339                                  LPX64",hash = "LPX64"\n", *start, *end, *hash);
 340                         CDEBUG(D_VFSTRACE, "page %lu [%llu %llu], hash "LPU64"\n",
 341                                offset, *start, *end, *hash);
 342                         if (*hash > *end) {
 343                                 ll_release_page(page, 0);
 344                                 page = NULL;
 345                         } else if (*end != *start && *hash == *end) {
 346                                 /*
 347                                  * upon hash collision, remove this page,
 348                                  * otherwise put page reference, and
 349                                  * ll_get_dir_page() will issue RPC to fetch
 350                                  * the page we want.
 351                                  */
 352                                 ll_release_page(page,
 353                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
 354                                 page = NULL;
 355                         }
 356                 } else {
 357                         page_cache_release(page);
 358                         page = ERR_PTR(-EIO);
 359                 }
 360
 361         } else {
 362                 TREE_READ_UNLOCK_IRQ(mapping);
 363                 page = NULL;
 364         }
 365         return page;
 366 }
 367
 368 struct page *ll_get_dir_page(struct file *filp, struct inode *dir, __u64 hash,
 369                              struct ll_dir_chain *chain)
 370 {
 371         ldlm_policy_data_t policy = {.l_inodebits = {MDS_INODELOCK_UPDATE} };
 372         struct address_space *mapping = dir->i_mapping;
 373         struct lustre_handle lockh;
 374         struct lu_dirpage *dp;
 375         struct page *page;
 376         ldlm_mode_t mode;
 377         int rc;
 378         __u64 start = 0;
 379         __u64 end = 0;
 380         __u64 lhash = hash;
 381         struct ll_inode_info *lli = ll_i2info(dir);
 382         int hash64 = ll_i2sbi(dir)->ll_flags & LL_SBI_64BIT_HASH;
 383
 384         mode = LCK_PR;
 385         rc = md_lock_match(ll_i2sbi(dir)->ll_md_exp, LDLM_FL_BLOCK_GRANTED,
 386                            ll_inode2fid(dir), LDLM_IBITS, &policy, mode, &lockh);
 387         if (!rc) {
 388                 struct ldlm_enqueue_info einfo = { LDLM_IBITS, mode,
 389                        ll_md_blocking_ast, ldlm_completion_ast,
 390                        NULL, NULL, dir };
 391                 struct lookup_intent it = { .it_op = IT_READDIR };
 392                 struct ptlrpc_request *request;
 393                 struct md_op_data *op_data;
 394
 395                 op_data = ll_prep_md_op_data(NULL, dir, NULL, NULL, 0, 0,
 396                                              LUSTRE_OPC_ANY, NULL);
 397                 if (IS_ERR(op_data))
 398                         return (void *)op_data;
 399
 400                 rc = md_enqueue(ll_i2sbi(dir)->ll_md_exp, &einfo, &it,
 401                                 op_data, &lockh, NULL, 0, NULL, 0);
 402
 403                 ll_finish_md_op_data(op_data);
 404
 405                 request = (struct ptlrpc_request *)it.d.lustre.it_data;
 406                 if (request)
 407                         ptlrpc_req_finished(request);
 408                 if (rc < 0) {
 409                         CERROR("lock enqueue: "DFID" at "LPU64": rc %d\n",
 410                                PFID(ll_inode2fid(dir)), hash, rc);
 411                         return ERR_PTR(rc);
 412                 }
 413         } else {
 414                 /* for cross-ref object, l_ast_data of the lock may not be set,
 415                  * we reset it here */
 416                 md_set_lock_data(ll_i2sbi(dir)->ll_md_exp, &lockh.cookie,
 417                                  dir, NULL);
 418         }
 419         ldlm_lock_dump_handle(D_OTHER, &lockh);
 420
 421         cfs_down(&lli->lli_readdir_sem);
 422         page = ll_dir_page_locate(dir, &lhash, &start, &end);
 423         if (IS_ERR(page)) {
 424                 CERROR("dir page locate: "DFID" at "LPU64": rc %ld\n",
 425                        PFID(ll_inode2fid(dir)), lhash, PTR_ERR(page));
 426                 GOTO(out_unlock, page);
 427         } else if (page != NULL) {
 428                 /*
 429                  * XXX nikita: not entirely correct handling of a corner case:
 430                  * suppose hash chain of entries with hash value HASH crosses
 431                  * border between pages P0 and P1. First both P0 and P1 are
 432                  * cached, seekdir() is called for some entry from the P0 part
 433                  * of the chain. Later P0 goes out of cache. telldir(HASH)
 434                  * happens and finds P1, as it starts with matching hash
 435                  * value. Remaining entries from P0 part of the chain are
 436                  * skipped. (Is that really a bug?)
 437                  *
 438                  * Possible solutions: 0. don't cache P1 is such case, handle
 439                  * it as an "overflow" page. 1. invalidate all pages at
 440                  * once. 2. use HASH|1 as an index for P1.
 441                  */
 442                 GOTO(hash_collision, page);
 443         }
 444
 445         page = read_cache_page(mapping, hash_x_index(hash, hash64),
 446                                (filler_t*)mapping->a_ops->readpage, filp);
 447         if (IS_ERR(page)) {
 448                 CERROR("read cache page: "DFID" at "LPU64": rc %ld\n",
 449                        PFID(ll_inode2fid(dir)), hash, PTR_ERR(page));
 450                 GOTO(out_unlock, page);
 451         }
 452
 453         wait_on_page(page);
 454         (void)kmap(page);
 455         if (!PageUptodate(page)) {
 456                 CERROR("page not updated: "DFID" at "LPU64": rc %d\n",
 457                        PFID(ll_inode2fid(dir)), hash, -5);
 458                 goto fail;
 459         }
 460         if (!PageChecked(page))
 461                 ll_check_page(dir, page);
 462         if (PageError(page)) {
 463                 CERROR("page error: "DFID" at "LPU64": rc %d\n",
 464                        PFID(ll_inode2fid(dir)), hash, -5);
 465                 goto fail;
 466         }
 467 hash_collision:
 468         dp = page_address(page);
 469         if (BITS_PER_LONG == 32 && hash64) {
 470                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
 471                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
 472                 lhash = hash >> 32;
 473         } else {
 474                 start = le64_to_cpu(dp->ldp_hash_start);
 475                 end   = le64_to_cpu(dp->ldp_hash_end);
 476                 lhash = hash;
 477         }
 478         if (end == start) {
 479                 LASSERT(start == lhash);
 480                 CWARN("Page-wide hash collision: "LPU64"\n", end);
 481                 if (BITS_PER_LONG == 32 && hash64)
 482                         CWARN("Real page-wide hash collision at ["LPU64" "LPU64
 483                               "] with hash "LPU64"\n",
 484                               le64_to_cpu(dp->ldp_hash_start),
 485                               le64_to_cpu(dp->ldp_hash_end), hash);
 486                 /*
 487                  * Fetch whole overflow chain...
 488                  *
 489                  * XXX not yet.
 490                  */
 491                 goto fail;
 492         }
 493 out_unlock:
 494         cfs_up(&lli->lli_readdir_sem);
 495         ldlm_lock_decref(&lockh, mode);
 496         return page;
 497
 498 fail:
 499         ll_release_page(page, 1);
 500         page = ERR_PTR(-EIO);
 501         goto out_unlock;
 502 }
 503
 504 int ll_readdir(struct file *filp, void *cookie, filldir_t filldir)
 505 {
 506         struct inode         *inode      = filp->f_dentry->d_inode;
 507         struct ll_inode_info *info       = ll_i2info(inode);
 508         struct ll_sb_info    *sbi        = ll_i2sbi(inode);
 509         struct ll_file_data  *fd         = LUSTRE_FPRIVATE(filp);
 510         __u64                 pos        = fd->fd_dir.lfd_pos;
 511         int                   api32      = ll_need_32bit_api(sbi);
 512         int                   hash64     = sbi->ll_flags & LL_SBI_64BIT_HASH;
 513         struct page          *page;
 514         struct ll_dir_chain   chain;
 515         int                   done;
 516         int                   shift;
 517         int                   rc;
 518         ENTRY;
 519
 520         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) pos %lu/%llu 32bit_api %d\n",
 521                inode->i_ino, inode->i_generation, inode,
 522                (unsigned long)pos, i_size_read(inode), api32);
 523
 524         if (pos == MDS_DIR_END_OFF)
 525                 /*
 526                  * end-of-file.
 527                  */
 528                 RETURN(0);
 529
 530         rc    = 0;
 531         done  = 0;
 532         shift = 0;
 533         ll_dir_chain_init(&chain);
 534
 535         fd->fd_dir.lfd_next = pos;
 536         page = ll_get_dir_page(filp, inode, pos, &chain);
 537
 538         while (rc == 0 && !done) {
 539                 struct lu_dirpage *dp;
 540                 struct lu_dirent  *ent;
 541
 542                 if (!IS_ERR(page)) {
 543                         /*
 544                          * If page is empty (end of directory is reached),
 545                          * use this value.
 546                          */
 547                         __u64 hash = MDS_DIR_END_OFF;
 548                         __u64 next;
 549
 550                         dp = page_address(page);
 551                         for (ent = lu_dirent_start(dp); ent != NULL && !done;
 552                              ent = lu_dirent_next(ent)) {
 553                                 __u16          type;
 554                                 int            namelen;
 555                                 struct lu_fid  fid;
 556                                 __u64          lhash;
 557                                 __u64          ino;
 558
 559                                 /*
 560                                  * XXX: implement correct swabbing here.
 561                                  */
 562
 563                                 hash = le64_to_cpu(ent->lde_hash);
 564                                 if (hash < pos)
 565                                         /*
 566                                          * Skip until we find target hash
 567                                          * value.
 568                                          */
 569                                         continue;
 570
 571                                 namelen = le16_to_cpu(ent->lde_namelen);
 572                                 if (namelen == 0)
 573                                         /*
 574                                          * Skip dummy record.
 575                                          */
 576                                         continue;
 577
 578                                 if (api32 && hash64)
 579                                         lhash = hash >> 32;
 580                                 else
 581                                         lhash = hash;
 582                                 fid_le_to_cpu(&fid, &ent->lde_fid);
 583                                 ino = cl_fid_build_ino(&fid, api32);
 584                                 type = ll_dirent_type_get(ent);
 585                                 /* For 'll_nfs_get_name_filldir()', it will try
 586                                  * to access the 'ent' through its 'lde_name',
 587                                  * so the parameter 'name' for 'filldir()' must
 588                                  * be part of the 'ent'. */
 589                                 done = filldir(cookie, ent->lde_name, namelen,
 590                                                lhash, ino, type);
 591                         }
 592                         next = le64_to_cpu(dp->ldp_hash_end);
 593                         if (!done) {
 594                                 pos = next;
 595                                 if (pos == MDS_DIR_END_OFF) {
 596                                         /*
 597                                          * End of directory reached.
 598                                          */
 599                                         done = 1;
 600                                         ll_release_page(page, 0);
 601                                 } else if (1 /* chain is exhausted*/) {
 602                                         /*
 603                                          * Normal case: continue to the next
 604                                          * page.
 605                                          */
 606                                         ll_release_page(page,
 607                                             le32_to_cpu(dp->ldp_flags) &
 608                                                         LDF_COLLIDE);
 609                                         fd->fd_dir.lfd_next = pos;
 610                                         page = ll_get_dir_page(filp, inode, pos,
 611                                                                &chain);
 612                                 } else {
 613                                         /*
 614                                          * go into overflow page.
 615                                          */
 616                                         LASSERT(le32_to_cpu(dp->ldp_flags) &
 617                                                 LDF_COLLIDE);
 618                                         ll_release_page(page, 1);
 619                                 }
 620                         } else {
 621                                 pos = hash;
 622                                 ll_release_page(page, 0);
 623                         }
 624                 } else {
 625                         rc = PTR_ERR(page);
 626                         CERROR("error reading dir "DFID" at %lu: rc %d\n",
 627                                PFID(&info->lli_fid), (unsigned long)pos, rc);
 628                 }
 629         }
 630
 631         fd->fd_dir.lfd_pos = pos;
 632         if (pos == MDS_DIR_END_OFF) {
 633                 if (api32)
 634                         filp->f_pos = LL_DIR_END_OFF_32BIT;
 635                 else
 636                         filp->f_pos = LL_DIR_END_OFF;
 637         } else {
 638                 if (api32 && hash64)
 639                         filp->f_pos = pos >> 32;
 640                 else
 641                         filp->f_pos = pos;
 642         }
 643         filp->f_version = inode->i_version;
 644         touch_atime(filp->f_vfsmnt, filp->f_dentry);
 645
 646         ll_dir_chain_fini(&chain);
 647
 648         RETURN(rc);
 649 }
 650
 651 int ll_send_mgc_param(struct obd_export *mgc, char *string)
 652 {
 653         struct mgs_send_param *msp;
 654         int rc = 0;
 655
 656         OBD_ALLOC_PTR(msp);
 657         if (!msp)
 658                 return -ENOMEM;
 659
 660         strncpy(msp->mgs_param, string, MGS_PARAM_MAXLEN);
 661         rc = obd_set_info_async(mgc, sizeof(KEY_SET_INFO), KEY_SET_INFO,
 662                                 sizeof(struct mgs_send_param), msp, NULL);
 663         if (rc)
 664                 CERROR("Failed to set parameter: %d\n", rc);
 665         OBD_FREE_PTR(msp);
 666
 667         return rc;
 668 }
 669
 670 char *ll_get_fsname(struct inode *inode)
 671 {
 672         struct lustre_sb_info *lsi = s2lsi(inode->i_sb);
 673         char *ptr, *fsname;
 674         int len;
 675
 676         OBD_ALLOC(fsname, MGS_PARAM_MAXLEN);
 677         len = strlen(lsi->lsi_lmd->lmd_profile);
 678         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
 679         if (ptr && (strcmp(ptr, "-client") == 0))
 680                 len -= 7;
 681         strncpy(fsname, lsi->lsi_lmd->lmd_profile, len);
 682         fsname[len] = '\0';
 683
 684         return fsname;
 685 }
 686
 687 int ll_dir_setstripe(struct inode *inode, struct lov_user_md *lump,
 688                      int set_default)
 689 {
 690         struct ll_sb_info *sbi = ll_i2sbi(inode);
 691         struct md_op_data *op_data;
 692         struct ptlrpc_request *req = NULL;
 693         int rc = 0;
 694         struct lustre_sb_info *lsi = s2lsi(inode->i_sb);
 695         struct obd_device *mgc = lsi->lsi_mgc;
 696         char *fsname = NULL, *param = NULL;
 697         int lum_size;
 698
 699         if (lump != NULL) {
 700                 /*
 701                  * This is coming from userspace, so should be in
 702                  * local endian.  But the MDS would like it in little
 703                  * endian, so we swab it before we send it.
 704                  */
 705                 switch (lump->lmm_magic) {
 706                 case LOV_USER_MAGIC_V1: {
 707                         if (lump->lmm_magic != cpu_to_le32(LOV_USER_MAGIC_V1))
 708                                 lustre_swab_lov_user_md_v1(lump);
 709                         lum_size = sizeof(struct lov_user_md_v1);
 710                         break;
 711                         }
 712                 case LOV_USER_MAGIC_V3: {
 713                         if (lump->lmm_magic != cpu_to_le32(LOV_USER_MAGIC_V3))
 714                                 lustre_swab_lov_user_md_v3(
 715                                         (struct lov_user_md_v3 *)lump);
 716                         lum_size = sizeof(struct lov_user_md_v3);
 717                         break;
 718                         }
 719                 default: {
 720                         CDEBUG(D_IOCTL, "bad userland LOV MAGIC:"
 721                                         " %#08x != %#08x nor %#08x\n",
 722                                         lump->lmm_magic, LOV_USER_MAGIC_V1,
 723                                         LOV_USER_MAGIC_V3);
 724                         RETURN(-EINVAL);
 725                         }
 726                }
 727         } else {
 728                 lum_size = sizeof(struct lov_user_md_v1);
 729         }
 730
 731         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
 732                                      LUSTRE_OPC_ANY, NULL);
 733         if (IS_ERR(op_data))
 734                 RETURN(PTR_ERR(op_data));
 735
 736         /* swabbing is done in lov_setstripe() on server side */
 737         rc = md_setattr(sbi->ll_md_exp, op_data, lump, lum_size,
 738                         NULL, 0, &req, NULL);
 739         ll_finish_md_op_data(op_data);
 740         ptlrpc_req_finished(req);
 741         if (rc) {
 742                 if (rc != -EPERM && rc != -EACCES)
 743                         CERROR("mdc_setattr fails: rc = %d\n", rc);
 744         }
 745
 746         /* In the following we use the fact that LOV_USER_MAGIC_V1 and
 747          LOV_USER_MAGIC_V3 have the same initial fields so we do not
 748          need the make the distiction between the 2 versions */
 749         if (set_default && mgc->u.cli.cl_mgc_mgsexp) {
 750                 OBD_ALLOC(param, MGS_PARAM_MAXLEN);
 751
 752                 /* Get fsname and assume devname to be -MDT0000. */
 753                 fsname = ll_get_fsname(inode);
 754                 /* Set root stripesize */
 755                 sprintf(param, "%s-MDT0000.lov.stripesize=%u", fsname,
 756                         lump ? le32_to_cpu(lump->lmm_stripe_size) : 0);
 757                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 758                 if (rc)
 759                         goto end;
 760
 761                 /* Set root stripecount */
 762                 sprintf(param, "%s-MDT0000.lov.stripecount=%hd", fsname,
 763                         lump ? le16_to_cpu(lump->lmm_stripe_count) : 0);
 764                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 765                 if (rc)
 766                         goto end;
 767
 768                 /* Set root stripeoffset */
 769                 sprintf(param, "%s-MDT0000.lov.stripeoffset=%hd", fsname,
 770                         lump ? le16_to_cpu(lump->lmm_stripe_offset) :
 771                         (typeof(lump->lmm_stripe_offset))(-1));
 772                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 773                 if (rc)
 774                         goto end;
 775 end:
 776                 if (fsname)
 777                         OBD_FREE(fsname, MGS_PARAM_MAXLEN);
 778                 if (param)
 779                         OBD_FREE(param, MGS_PARAM_MAXLEN);
 780         }
 781         return rc;
 782 }
 783
 784 int ll_dir_getstripe(struct inode *inode, struct lov_mds_md **lmmp,
 785                      int *lmm_size, struct ptlrpc_request **request)
 786 {
 787         struct ll_sb_info *sbi = ll_i2sbi(inode);
 788         struct mdt_body   *body;
 789         struct lov_mds_md *lmm = NULL;
 790         struct ptlrpc_request *req = NULL;
 791         int rc, lmmsize;
 792         struct md_op_data *op_data;
 793
 794         rc = ll_get_max_mdsize(sbi, &lmmsize);
 795         if (rc)
 796                 RETURN(rc);
 797
 798         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL,
 799                                      0, lmmsize, LUSTRE_OPC_ANY,
 800                                      NULL);
 801         if (IS_ERR(op_data))
 802                 RETURN(PTR_ERR(op_data));
 803
 804         op_data->op_valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA;
 805         rc = md_getattr(sbi->ll_md_exp, op_data, &req);
 806         ll_finish_md_op_data(op_data);
 807         if (rc < 0) {
 808                 CDEBUG(D_INFO, "md_getattr failed on inode "
 809                        "%lu/%u: rc %d\n", inode->i_ino,
 810                        inode->i_generation, rc);
 811                 GOTO(out, rc);
 812         }
 813
 814         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 815         LASSERT(body != NULL);
 816
 817         lmmsize = body->eadatasize;
 818
 819         if (!(body->valid & (OBD_MD_FLEASIZE | OBD_MD_FLDIREA)) ||
 820             lmmsize == 0) {
 821                 GOTO(out, rc = -ENODATA);
 822         }
 823
 824         lmm = req_capsule_server_sized_get(&req->rq_pill,
 825                                            &RMF_MDT_MD, lmmsize);
 826         LASSERT(lmm != NULL);
 827
 828         /*
 829          * This is coming from the MDS, so is probably in
 830          * little endian.  We convert it to host endian before
 831          * passing it to userspace.
 832          */
 833         /* We don't swab objects for directories */
 834         switch (le32_to_cpu(lmm->lmm_magic)) {
 835         case LOV_MAGIC_V1:
 836                 if (LOV_MAGIC != cpu_to_le32(LOV_MAGIC))
 837                         lustre_swab_lov_user_md_v1((struct lov_user_md_v1 *)lmm);
 838                 break;
 839         case LOV_MAGIC_V3:
 840                 if (LOV_MAGIC != cpu_to_le32(LOV_MAGIC))
 841                         lustre_swab_lov_user_md_v3((struct lov_user_md_v3 *)lmm);
 842                 break;
 843         default:
 844                 CERROR("unknown magic: %lX\n", (unsigned long)lmm->lmm_magic);
 845                 rc = -EPROTO;
 846         }
 847 out:
 848         *lmmp = lmm;
 849         *lmm_size = lmmsize;
 850         *request = req;
 851         return rc;
 852 }
 853
 854 /*
 855  *  Get MDT index for the inode.
 856  */
 857 int ll_get_mdt_idx(struct inode *inode)
 858 {
 859         struct ll_sb_info *sbi = ll_i2sbi(inode);
 860         struct md_op_data *op_data;
 861         int rc, mdtidx;
 862         ENTRY;
 863
 864         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0,
 865                                      0, LUSTRE_OPC_ANY, NULL);
 866         if (IS_ERR(op_data))
 867                 RETURN(PTR_ERR(op_data));
 868
 869         op_data->op_valid |= OBD_MD_MDTIDX;
 870         rc = md_getattr(sbi->ll_md_exp, op_data, NULL);
 871         mdtidx = op_data->op_mds;
 872         ll_finish_md_op_data(op_data);
 873         if (rc < 0) {
 874                 CDEBUG(D_INFO, "md_getattr_name: %d\n", rc);
 875                 RETURN(rc);
 876         }
 877         return mdtidx;
 878 }
 879
 880 static int copy_and_ioctl(int cmd, struct obd_export *exp, void *data, int len)
 881 {
 882         void *ptr;
 883         int rc;
 884
 885         OBD_ALLOC(ptr, len);
 886         if (ptr == NULL)
 887                 return -ENOMEM;
 888         if (cfs_copy_from_user(ptr, data, len)) {
 889                 OBD_FREE(ptr, len);
 890                 return -EFAULT;
 891         }
 892         rc = obd_iocontrol(cmd, exp, len, data, NULL);
 893         OBD_FREE(ptr, len);
 894         return rc;
 895 }
 896
 897 static int quotactl_ioctl(struct ll_sb_info *sbi, struct if_quotactl *qctl)
 898 {
 899         int cmd = qctl->qc_cmd;
 900         int type = qctl->qc_type;
 901         int id = qctl->qc_id;
 902         int valid = qctl->qc_valid;
 903         int rc = 0;
 904         ENTRY;
 905
 906         switch (cmd) {
 907         case LUSTRE_Q_INVALIDATE:
 908         case LUSTRE_Q_FINVALIDATE:
 909         case Q_QUOTAON:
 910         case Q_QUOTAOFF:
 911         case Q_SETQUOTA:
 912         case Q_SETINFO:
 913                 if (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
 914                     sbi->ll_flags & LL_SBI_RMT_CLIENT)
 915                         RETURN(-EPERM);
 916                 break;
 917         case Q_GETQUOTA:
 918                 if (((type == USRQUOTA && cfs_curproc_euid() != id) ||
 919                      (type == GRPQUOTA && !in_egroup_p(id))) &&
 920                     (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
 921                      sbi->ll_flags & LL_SBI_RMT_CLIENT))
 922                         RETURN(-EPERM);
 923                 break;
 924         case Q_GETINFO:
 925                 break;
 926         default:
 927                 CERROR("unsupported quotactl op: %#x\n", cmd);
 928                 RETURN(-ENOTTY);
 929         }
 930
 931         if (valid != QC_GENERAL) {
 932                 if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 933                         RETURN(-EOPNOTSUPP);
 934
 935                 if (cmd == Q_GETINFO)
 936                         qctl->qc_cmd = Q_GETOINFO;
 937                 else if (cmd == Q_GETQUOTA)
 938                         qctl->qc_cmd = Q_GETOQUOTA;
 939                 else
 940                         RETURN(-EINVAL);
 941
 942                 switch (valid) {
 943                 case QC_MDTIDX:
 944                         rc = obd_iocontrol(OBD_IOC_QUOTACTL, sbi->ll_md_exp,
 945                                            sizeof(*qctl), qctl, NULL);
 946                         break;
 947                 case QC_OSTIDX:
 948                         rc = obd_iocontrol(OBD_IOC_QUOTACTL, sbi->ll_dt_exp,
 949                                            sizeof(*qctl), qctl, NULL);
 950                         break;
 951                 case QC_UUID:
 952                         rc = obd_iocontrol(OBD_IOC_QUOTACTL, sbi->ll_md_exp,
 953                                            sizeof(*qctl), qctl, NULL);
 954                         if (rc == -EAGAIN)
 955                                 rc = obd_iocontrol(OBD_IOC_QUOTACTL,
 956                                                    sbi->ll_dt_exp,
 957                                                    sizeof(*qctl), qctl, NULL);
 958                         break;
 959                 default:
 960                         rc = -EINVAL;
 961                         break;
 962                 }
 963
 964                 if (rc)
 965                         RETURN(rc);
 966
 967                 qctl->qc_cmd = cmd;
 968         } else {
 969                 struct obd_quotactl *oqctl;
 970
 971                 OBD_ALLOC_PTR(oqctl);
 972                 if (oqctl == NULL)
 973                         RETURN(-ENOMEM);
 974
 975                 QCTL_COPY(oqctl, qctl);
 976                 rc = obd_quotactl(sbi->ll_md_exp, oqctl);
 977                 if (rc) {
 978                         if (rc != -EALREADY && cmd == Q_QUOTAON) {
 979                                 oqctl->qc_cmd = Q_QUOTAOFF;
 980                                 obd_quotactl(sbi->ll_md_exp, oqctl);
 981                         }
 982                         OBD_FREE_PTR(oqctl);
 983                         RETURN(rc);
 984                 }
 985
 986                 QCTL_COPY(qctl, oqctl);
 987                 OBD_FREE_PTR(oqctl);
 988         }
 989
 990         RETURN(rc);
 991 }
 992
 993 static int ll_dir_ioctl(struct inode *inode, struct file *file,
 994                         unsigned int cmd, unsigned long arg)
 995 {
 996         struct ll_sb_info *sbi = ll_i2sbi(inode);
 997         struct obd_ioctl_data *data;
 998         int rc = 0;
 999         ENTRY;
1000
1001         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), cmd=%#x\n",
1002                inode->i_ino, inode->i_generation, inode, cmd);
1003
1004         /* asm-ppc{,64} declares TCGETS, et. al. as type 't' not 'T' */
1005         if (_IOC_TYPE(cmd) == 'T' || _IOC_TYPE(cmd) == 't') /* tty ioctls */
1006                 return -ENOTTY;
1007
1008         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_IOCTL, 1);
1009         switch(cmd) {
1010         case FSFILT_IOC_GETFLAGS:
1011         case FSFILT_IOC_SETFLAGS:
1012                 RETURN(ll_iocontrol(inode, file, cmd, arg));
1013         case FSFILT_IOC_GETVERSION_OLD:
1014         case FSFILT_IOC_GETVERSION:
1015                 RETURN(put_user(inode->i_generation, (int *)arg));
1016         /* We need to special case any other ioctls we want to handle,
1017          * to send them to the MDS/OST as appropriate and to properly
1018          * network encode the arg field.
1019         case FSFILT_IOC_SETVERSION_OLD:
1020         case FSFILT_IOC_SETVERSION:
1021         */
1022         case LL_IOC_GET_MDTIDX: {
1023                 int mdtidx;
1024
1025                 mdtidx = ll_get_mdt_idx(inode);
1026                 if (mdtidx < 0)
1027                         RETURN(mdtidx);
1028
1029                 if (put_user((int)mdtidx, (int*)arg))
1030                         RETURN(-EFAULT);
1031
1032                 return 0;
1033         }
1034         case IOC_MDC_LOOKUP: {
1035                 struct ptlrpc_request *request = NULL;
1036                 int namelen, len = 0;
1037                 char *buf = NULL;
1038                 char *filename;
1039                 struct md_op_data *op_data;
1040
1041                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
1042                 if (rc)
1043                         RETURN(rc);
1044                 data = (void *)buf;
1045
1046                 filename = data->ioc_inlbuf1;
1047                 namelen = strlen(filename);
1048
1049                 if (namelen < 1) {
1050                         CDEBUG(D_INFO, "IOC_MDC_LOOKUP missing filename\n");
1051                         GOTO(out_free, rc = -EINVAL);
1052                 }
1053
1054                 op_data = ll_prep_md_op_data(NULL, inode, NULL, filename, namelen,
1055                                              0, LUSTRE_OPC_ANY, NULL);
1056                 if (IS_ERR(op_data))
1057                         GOTO(out_free, rc = PTR_ERR(op_data));
1058
1059                 op_data->op_valid = OBD_MD_FLID;
1060                 rc = md_getattr_name(sbi->ll_md_exp, op_data, &request);
1061                 ll_finish_md_op_data(op_data);
1062                 if (rc < 0) {
1063                         CDEBUG(D_INFO, "md_getattr_name: %d\n", rc);
1064                         GOTO(out_free, rc);
1065                 }
1066                 ptlrpc_req_finished(request);
1067                 EXIT;
1068 out_free:
1069                 obd_ioctl_freedata(buf, len);
1070                 return rc;
1071         }
1072         case LL_IOC_LOV_SETSTRIPE: {
1073                 struct lov_user_md_v3 lumv3;
1074                 struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&lumv3;
1075                 struct lov_user_md_v1 *lumv1p = (struct lov_user_md_v1 *)arg;
1076                 struct lov_user_md_v3 *lumv3p = (struct lov_user_md_v3 *)arg;
1077
1078                 int set_default = 0;
1079
1080                 LASSERT(sizeof(lumv3) == sizeof(*lumv3p));
1081                 LASSERT(sizeof(lumv3.lmm_objects[0]) ==
1082                         sizeof(lumv3p->lmm_objects[0]));
1083                 /* first try with v1 which is smaller than v3 */
1084                 if (cfs_copy_from_user(lumv1, lumv1p, sizeof(*lumv1)))
1085                         RETURN(-EFAULT);
1086
1087                 if (lumv1->lmm_magic == LOV_USER_MAGIC_V3) {
1088                         if (cfs_copy_from_user(&lumv3, lumv3p, sizeof(lumv3)))
1089                                 RETURN(-EFAULT);
1090                 }
1091
1092                 if (inode->i_sb->s_root == file->f_dentry)
1093                         set_default = 1;
1094
1095                 /* in v1 and v3 cases lumv1 points to data */
1096                 rc = ll_dir_setstripe(inode, lumv1, set_default);
1097
1098                 RETURN(rc);
1099         }
1100         case LL_IOC_OBD_STATFS:
1101                 RETURN(ll_obd_statfs(inode, (void *)arg));
1102         case LL_IOC_LOV_GETSTRIPE:
1103         case LL_IOC_MDC_GETINFO:
1104         case IOC_MDC_GETFILEINFO:
1105         case IOC_MDC_GETFILESTRIPE: {
1106                 struct ptlrpc_request *request = NULL;
1107                 struct lov_user_md *lump;
1108                 struct lov_mds_md *lmm = NULL;
1109                 struct mdt_body *body;
1110                 char *filename = NULL;
1111                 int lmmsize;
1112
1113                 if (cmd == IOC_MDC_GETFILEINFO ||
1114                     cmd == IOC_MDC_GETFILESTRIPE) {
1115                         filename = getname((const char *)arg);
1116                         if (IS_ERR(filename))
1117                                 RETURN(PTR_ERR(filename));
1118
1119                         rc = ll_lov_getstripe_ea_info(inode, filename, &lmm,
1120                                                       &lmmsize, &request);
1121                 } else {
1122                         rc = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
1123                 }
1124
1125                 if (request) {
1126                         body = req_capsule_server_get(&request->rq_pill,
1127                                                       &RMF_MDT_BODY);
1128                         LASSERT(body != NULL);
1129                 } else {
1130                         GOTO(out_req, rc);
1131                 }
1132
1133                 if (rc < 0) {
1134                         if (rc == -ENODATA && (cmd == IOC_MDC_GETFILEINFO ||
1135                                                cmd == LL_IOC_MDC_GETINFO))
1136                                 GOTO(skip_lmm, rc = 0);
1137                         else
1138                                 GOTO(out_req, rc);
1139                 }
1140
1141                 if (cmd == IOC_MDC_GETFILESTRIPE ||
1142                     cmd == LL_IOC_LOV_GETSTRIPE) {
1143                         lump = (struct lov_user_md *)arg;
1144                 } else {
1145                         struct lov_user_mds_data *lmdp;
1146                         lmdp = (struct lov_user_mds_data *)arg;
1147                         lump = &lmdp->lmd_lmm;
1148                 }
1149                 if (cfs_copy_to_user(lump, lmm, lmmsize)) {
1150                         if (cfs_copy_to_user(lump, lmm, sizeof(*lump)))
1151                                 GOTO(out_req, rc = -EFAULT);
1152                         rc = -EOVERFLOW;
1153                 }
1154         skip_lmm:
1155                 if (cmd == IOC_MDC_GETFILEINFO || cmd == LL_IOC_MDC_GETINFO) {
1156                         struct lov_user_mds_data *lmdp;
1157                         lstat_t st = { 0 };
1158
1159                         st.st_dev     = inode->i_sb->s_dev;
1160                         st.st_mode    = body->mode;
1161                         st.st_nlink   = body->nlink;
1162                         st.st_uid     = body->uid;
1163                         st.st_gid     = body->gid;
1164                         st.st_rdev    = body->rdev;
1165                         st.st_size    = body->size;
1166                         st.st_blksize = CFS_PAGE_SIZE;
1167                         st.st_blocks  = body->blocks;
1168                         st.st_atime   = body->atime;
1169                         st.st_mtime   = body->mtime;
1170                         st.st_ctime   = body->ctime;
1171                         st.st_ino     = inode->i_ino;
1172
1173                         lmdp = (struct lov_user_mds_data *)arg;
1174                         if (cfs_copy_to_user(&lmdp->lmd_st, &st, sizeof(st)))
1175                                 GOTO(out_req, rc = -EFAULT);
1176                 }
1177
1178                 EXIT;
1179         out_req:
1180                 ptlrpc_req_finished(request);
1181                 if (filename)
1182                         putname(filename);
1183                 return rc;
1184         }
1185         case IOC_LOV_GETINFO: {
1186                 struct lov_user_mds_data *lumd;
1187                 struct lov_stripe_md *lsm;
1188                 struct lov_user_md *lum;
1189                 struct lov_mds_md *lmm;
1190                 int lmmsize;
1191                 lstat_t st;
1192
1193                 lumd = (struct lov_user_mds_data *)arg;
1194                 lum = &lumd->lmd_lmm;
1195
1196                 rc = ll_get_max_mdsize(sbi, &lmmsize);
1197                 if (rc)
1198                         RETURN(rc);
1199
1200                 OBD_ALLOC_LARGE(lmm, lmmsize);
1201                 if (cfs_copy_from_user(lmm, lum, lmmsize))
1202                         GOTO(free_lmm, rc = -EFAULT);
1203
1204                 switch (lmm->lmm_magic) {
1205                 case LOV_USER_MAGIC_V1:
1206                         if (LOV_USER_MAGIC_V1 == cpu_to_le32(LOV_USER_MAGIC_V1))
1207                                 break;
1208                         /* swab objects first so that stripes num will be sane */
1209                         lustre_swab_lov_user_md_objects(
1210                                 ((struct lov_user_md_v1 *)lmm)->lmm_objects,
1211                                 ((struct lov_user_md_v1 *)lmm)->lmm_stripe_count);
1212                         lustre_swab_lov_user_md_v1((struct lov_user_md_v1 *)lmm);
1213                         break;
1214                 case LOV_USER_MAGIC_V3:
1215                         if (LOV_USER_MAGIC_V3 == cpu_to_le32(LOV_USER_MAGIC_V3))
1216                                 break;
1217                         /* swab objects first so that stripes num will be sane */
1218                         lustre_swab_lov_user_md_objects(
1219                                 ((struct lov_user_md_v3 *)lmm)->lmm_objects,
1220                                 ((struct lov_user_md_v3 *)lmm)->lmm_stripe_count);
1221                         lustre_swab_lov_user_md_v3((struct lov_user_md_v3 *)lmm);
1222                         break;
1223                 default:
1224                         GOTO(free_lmm, rc = -EINVAL);
1225                 }
1226
1227                 rc = obd_unpackmd(sbi->ll_dt_exp, &lsm, lmm, lmmsize);
1228                 if (rc < 0)
1229                         GOTO(free_lmm, rc = -ENOMEM);
1230
1231                 /* Perform glimpse_size operation. */
1232                 memset(&st, 0, sizeof(st));
1233
1234                 rc = ll_glimpse_ioctl(sbi, lsm, &st);
1235                 if (rc)
1236                         GOTO(free_lsm, rc);
1237
1238                 if (cfs_copy_to_user(&lumd->lmd_st, &st, sizeof(st)))
1239                         GOTO(free_lsm, rc = -EFAULT);
1240
1241                 EXIT;
1242         free_lsm:
1243                 obd_free_memmd(sbi->ll_dt_exp, &lsm);
1244         free_lmm:
1245                 OBD_FREE_LARGE(lmm, lmmsize);
1246                 return rc;
1247         }
1248         case OBD_IOC_LLOG_CATINFO: {
1249                 struct ptlrpc_request *req = NULL;
1250                 char                  *buf = NULL;
1251                 char                  *str;
1252                 int                    len = 0;
1253
1254                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
1255                 if (rc)
1256                         RETURN(rc);
1257                 data = (void *)buf;
1258
1259                 if (!data->ioc_inlbuf1) {
1260                         obd_ioctl_freedata(buf, len);
1261                         RETURN(-EINVAL);
1262                 }
1263
1264                 req = ptlrpc_request_alloc(sbi2mdc(sbi)->cl_import,
1265                                            &RQF_LLOG_CATINFO);
1266                 if (req == NULL)
1267                         GOTO(out_catinfo, rc = -ENOMEM);
1268
1269                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
1270                                      data->ioc_inllen1);
1271                 req_capsule_set_size(&req->rq_pill, &RMF_STRING, RCL_CLIENT,
1272                                      data->ioc_inllen2);
1273
1274                 rc = ptlrpc_request_pack(req, LUSTRE_LOG_VERSION, LLOG_CATINFO);
1275                 if (rc) {
1276                         ptlrpc_request_free(req);
1277                         GOTO(out_catinfo, rc);
1278                 }
1279
1280                 str = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
1281                 memcpy(str, data->ioc_inlbuf1, data->ioc_inllen1);
1282                 if (data->ioc_inllen2) {
1283                         str = req_capsule_client_get(&req->rq_pill,
1284                                                      &RMF_STRING);
1285                         memcpy(str, data->ioc_inlbuf2, data->ioc_inllen2);
1286                 }
1287
1288                 req_capsule_set_size(&req->rq_pill, &RMF_STRING, RCL_SERVER,
1289                                      data->ioc_plen1);
1290                 ptlrpc_request_set_replen(req);
1291
1292                 rc = ptlrpc_queue_wait(req);
1293                 if (!rc) {
1294                         str = req_capsule_server_get(&req->rq_pill,
1295                                                      &RMF_STRING);
1296                         if (cfs_copy_to_user(data->ioc_pbuf1, str,
1297                                              data->ioc_plen1))
1298                                 rc = -EFAULT;
1299                 }
1300                 ptlrpc_req_finished(req);
1301         out_catinfo:
1302                 obd_ioctl_freedata(buf, len);
1303                 RETURN(rc);
1304         }
1305         case OBD_IOC_QUOTACHECK: {
1306                 struct obd_quotactl *oqctl;
1307                 int error = 0;
1308
1309                 if (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
1310                     sbi->ll_flags & LL_SBI_RMT_CLIENT)
1311                         RETURN(-EPERM);
1312
1313                 OBD_ALLOC_PTR(oqctl);
1314                 if (!oqctl)
1315                         RETURN(-ENOMEM);
1316                 oqctl->qc_type = arg;
1317                 rc = obd_quotacheck(sbi->ll_md_exp, oqctl);
1318                 if (rc < 0) {
1319                         CDEBUG(D_INFO, "md_quotacheck failed: rc %d\n", rc);
1320                         error = rc;
1321                 }
1322
1323                 rc = obd_quotacheck(sbi->ll_dt_exp, oqctl);
1324                 if (rc < 0)
1325                         CDEBUG(D_INFO, "obd_quotacheck failed: rc %d\n", rc);
1326
1327                 OBD_FREE_PTR(oqctl);
1328                 return error ?: rc;
1329         }
1330         case OBD_IOC_POLL_QUOTACHECK: {
1331                 struct if_quotacheck *check;
1332
1333                 if (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
1334                     sbi->ll_flags & LL_SBI_RMT_CLIENT)
1335                         RETURN(-EPERM);
1336
1337                 OBD_ALLOC_PTR(check);
1338                 if (!check)
1339                         RETURN(-ENOMEM);
1340
1341                 rc = obd_iocontrol(cmd, sbi->ll_md_exp, 0, (void *)check,
1342                                    NULL);
1343                 if (rc) {
1344                         CDEBUG(D_QUOTA, "mdc ioctl %d failed: %d\n", cmd, rc);
1345                         if (cfs_copy_to_user((void *)arg, check,
1346                                              sizeof(*check)))
1347                                 CDEBUG(D_QUOTA, "cfs_copy_to_user failed\n");
1348                         GOTO(out_poll, rc);
1349                 }
1350
1351                 rc = obd_iocontrol(cmd, sbi->ll_dt_exp, 0, (void *)check,
1352                                    NULL);
1353                 if (rc) {
1354                         CDEBUG(D_QUOTA, "osc ioctl %d failed: %d\n", cmd, rc);
1355                         if (cfs_copy_to_user((void *)arg, check,
1356                                              sizeof(*check)))
1357                                 CDEBUG(D_QUOTA, "cfs_copy_to_user failed\n");
1358                         GOTO(out_poll, rc);
1359                 }
1360         out_poll:
1361                 OBD_FREE_PTR(check);
1362                 RETURN(rc);
1363         }
1364 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2,7,50,0)
1365         case LL_IOC_QUOTACTL_18: {
1366                 /* copy the old 1.x quota struct for internal use, then copy
1367                  * back into old format struct.  For 1.8 compatibility. */
1368                 struct if_quotactl_18 *qctl_18;
1369                 struct if_quotactl *qctl_20;
1370
1371                 OBD_ALLOC_PTR(qctl_18);
1372                 if (!qctl_18)
1373                         RETURN(-ENOMEM);
1374
1375                 OBD_ALLOC_PTR(qctl_20);
1376                 if (!qctl_20)
1377                         GOTO(out_quotactl_18, rc = -ENOMEM);
1378
1379                 if (cfs_copy_from_user(qctl_18, (void *)arg, sizeof(*qctl_18)))
1380                         GOTO(out_quotactl_20, rc = -ENOMEM);
1381
1382                 QCTL_COPY(qctl_20, qctl_18);
1383                 qctl_20->qc_idx = 0;
1384
1385                 /* XXX: dqb_valid was borrowed as a flag to mark that
1386                  *      only mds quota is wanted */
1387                 if (qctl_18->qc_cmd == Q_GETQUOTA &&
1388                     qctl_18->qc_dqblk.dqb_valid) {
1389                         qctl_20->qc_valid = QC_MDTIDX;
1390                         qctl_20->qc_dqblk.dqb_valid = 0;
1391                 } else if (qctl_18->obd_uuid.uuid[0] != '\0') {
1392                         qctl_20->qc_valid = QC_UUID;
1393                         qctl_20->obd_uuid = qctl_18->obd_uuid;
1394                 } else {
1395                         qctl_20->qc_valid = QC_GENERAL;
1396                 }
1397
1398                 rc = quotactl_ioctl(sbi, qctl_20);
1399
1400                 if (rc == 0) {
1401                         QCTL_COPY(qctl_18, qctl_20);
1402                         qctl_18->obd_uuid = qctl_20->obd_uuid;
1403
1404                         if (cfs_copy_to_user((void *)arg, qctl_18,
1405                                              sizeof(*qctl_18)))
1406                                 rc = -EFAULT;
1407                 }
1408
1409         out_quotactl_20:
1410                 OBD_FREE_PTR(qctl_20);
1411         out_quotactl_18:
1412                 OBD_FREE_PTR(qctl_18);
1413                 RETURN(rc);
1414         }
1415 #else
1416 #warning "remove old LL_IOC_QUOTACTL_18 compatibility code"
1417 #endif /* LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2,7,50,0) */
1418         case LL_IOC_QUOTACTL: {
1419                 struct if_quotactl *qctl;
1420
1421                 OBD_ALLOC_PTR(qctl);
1422                 if (!qctl)
1423                         RETURN(-ENOMEM);
1424
1425                 if (cfs_copy_from_user(qctl, (void *)arg, sizeof(*qctl)))
1426                         GOTO(out_quotactl, rc = -EFAULT);
1427
1428                 rc = quotactl_ioctl(sbi, qctl);
1429
1430                 if (rc == 0 && cfs_copy_to_user((void *)arg,qctl,sizeof(*qctl)))
1431                         rc = -EFAULT;
1432
1433         out_quotactl:
1434                 OBD_FREE_PTR(qctl);
1435                 RETURN(rc);
1436         }
1437         case OBD_IOC_GETNAME: {
1438                 struct obd_device *obd = class_exp2obd(sbi->ll_dt_exp);
1439                 if (!obd)
1440                         RETURN(-EFAULT);
1441                 if (cfs_copy_to_user((void *)arg, obd->obd_name,
1442                                      strlen(obd->obd_name) + 1))
1443                         RETURN (-EFAULT);
1444                 RETURN(0);
1445         }
1446         case LL_IOC_FLUSHCTX:
1447                 RETURN(ll_flush_ctx(inode));
1448 #ifdef CONFIG_FS_POSIX_ACL
1449         case LL_IOC_RMTACL: {
1450             if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
1451                 inode == inode->i_sb->s_root->d_inode) {
1452                 struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
1453
1454                 LASSERT(fd != NULL);
1455                 rc = rct_add(&sbi->ll_rct, cfs_curproc_pid(), arg);
1456                 if (!rc)
1457                         fd->fd_flags |= LL_FILE_RMTACL;
1458                 RETURN(rc);
1459             } else
1460                 RETURN(0);
1461         }
1462 #endif
1463         case LL_IOC_GETOBDCOUNT: {
1464                 int count, vallen;
1465                 struct obd_export *exp;
1466
1467                 if (cfs_copy_from_user(&count, (int *)arg, sizeof(int)))
1468                         RETURN(-EFAULT);
1469
1470                 /* get ost count when count is zero, get mdt count otherwise */
1471                 exp = count ? sbi->ll_md_exp : sbi->ll_dt_exp;
1472                 vallen = sizeof(count);
1473                 rc = obd_get_info(exp, sizeof(KEY_TGT_COUNT), KEY_TGT_COUNT,
1474                                   &vallen, &count, NULL);
1475                 if (rc) {
1476                         CERROR("get target count failed: %d\n", rc);
1477                         RETURN(rc);
1478                 }
1479
1480                 if (cfs_copy_to_user((int *)arg, &count, sizeof(int)))
1481                         RETURN(-EFAULT);
1482
1483                 RETURN(0);
1484         }
1485         case LL_IOC_PATH2FID:
1486                 if (cfs_copy_to_user((void *)arg, ll_inode2fid(inode),
1487                                      sizeof(struct lu_fid)))
1488                         RETURN(-EFAULT);
1489                 RETURN(0);
1490         case LL_IOC_GET_CONNECT_FLAGS: {
1491                 RETURN(obd_iocontrol(cmd, sbi->ll_md_exp, 0, NULL, (void*)arg));
1492         }
1493         case OBD_IOC_CHANGELOG_SEND:
1494         case OBD_IOC_CHANGELOG_CLEAR:
1495                 rc = copy_and_ioctl(cmd, sbi->ll_md_exp, (void *)arg,
1496                                     sizeof(struct ioc_changelog));
1497                 RETURN(rc);
1498         case OBD_IOC_FID2PATH:
1499                 RETURN(ll_fid2path(ll_i2mdexp(inode), (void *)arg));
1500         case LL_IOC_HSM_CT_START:
1501                 rc = copy_and_ioctl(cmd, sbi->ll_md_exp, (void *)arg,
1502                                     sizeof(struct lustre_kernelcomm));
1503                 RETURN(rc);
1504
1505         default:
1506                 RETURN(obd_iocontrol(cmd, sbi->ll_dt_exp,0,NULL,(void *)arg));
1507         }
1508 }
1509
1510 static loff_t ll_dir_seek(struct file *file, loff_t offset, int origin)
1511 {
1512         struct inode *inode = file->f_mapping->host;
1513         struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
1514         struct ll_sb_info *sbi = ll_i2sbi(inode);
1515         int api32 = ll_need_32bit_api(sbi);
1516         loff_t ret = -EINVAL;
1517         ENTRY;
1518
1519         cfs_mutex_lock(&inode->i_mutex);
1520         switch (origin) {
1521                 case SEEK_SET:
1522                         break;
1523                 case SEEK_CUR:
1524                         offset += file->f_pos;
1525                         break;
1526                 case SEEK_END:
1527                         if (offset > 0)
1528                                 GOTO(out, ret);
1529                         if (api32)
1530                                 offset += LL_DIR_END_OFF_32BIT;
1531                         else
1532                                 offset += LL_DIR_END_OFF;
1533                         break;
1534                 default:
1535                         GOTO(out, ret);
1536         }
1537
1538         if (offset >= 0 &&
1539             ((api32 && offset <= LL_DIR_END_OFF_32BIT) ||
1540              (!api32 && offset <= LL_DIR_END_OFF))) {
1541                 if (offset != file->f_pos) {
1542                         if ((api32 && offset == LL_DIR_END_OFF_32BIT) ||
1543                             (!api32 && offset == LL_DIR_END_OFF))
1544                                 fd->fd_dir.lfd_pos = MDS_DIR_END_OFF;
1545                         else if (api32 && sbi->ll_flags & LL_SBI_64BIT_HASH)
1546                                 fd->fd_dir.lfd_pos = offset << 32;
1547                         else
1548                                 fd->fd_dir.lfd_pos = offset;
1549                         file->f_pos = offset;
1550                         file->f_version = 0;
1551                 }
1552                 ret = offset;
1553         }
1554         GOTO(out, ret);
1555
1556 out:
1557         cfs_mutex_unlock(&inode->i_mutex);
1558         return ret;
1559 }
1560
1561 int ll_dir_open(struct inode *inode, struct file *file)
1562 {
1563         ENTRY;
1564         RETURN(ll_file_open(inode, file));
1565 }
1566
1567 int ll_dir_release(struct inode *inode, struct file *file)
1568 {
1569         ENTRY;
1570         RETURN(ll_file_release(inode, file));
1571 }
1572
1573 struct file_operations ll_dir_operations = {
1574         .llseek   = ll_dir_seek,
1575         .open     = ll_dir_open,
1576         .release  = ll_dir_release,
1577         .read     = generic_read_dir,
1578         .readdir  = ll_readdir,
1579         .ioctl    = ll_dir_ioctl,
1580         .fsync    = ll_fsync
1581 };