lustre/llite/dir.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Whamcloud, Inc.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/llite/dir.c
  37  *
  38  * Directory code for lustre client.
  39  */
  40
  41 #include <linux/fs.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mm.h>
  44 #include <linux/version.h>
  45 #include <asm/uaccess.h>
  46 #include <linux/buffer_head.h>   // for wait_on_buffer
  47 #include <linux/pagevec.h>
  48
  49 #define DEBUG_SUBSYSTEM S_LLITE
  50
  51 #include <obd_support.h>
  52 #include <obd_class.h>
  53 #include <lustre_lib.h>
  54 #include <lustre/lustre_idl.h>
  55 #include <lustre_lite.h>
  56 #include <lustre_dlm.h>
  57 #include <lustre_fid.h>
  58 #include "llite_internal.h"
  59
  60 /*
  61  * (new) readdir implementation overview.
  62  *
  63  * Original lustre readdir implementation cached exact copy of raw directory
  64  * pages on the client. These pages were indexed in client page cache by
  65  * logical offset in the directory file. This design, while very simple and
  66  * intuitive had some inherent problems:
  67  *
  68  *     . it implies that byte offset to the directory entry serves as a
  69  *     telldir(3)/seekdir(3) cookie, but that offset is not stable: in
  70  *     ext3/htree directory entries may move due to splits, and more
  71  *     importantly,
  72  *
  73  *     . it is incompatible with the design of split directories for cmd3,
  74  *     that assumes that names are distributed across nodes based on their
  75  *     hash, and so readdir should be done in hash order.
  76  *
  77  * New readdir implementation does readdir in hash order, and uses hash of a
  78  * file name as a telldir/seekdir cookie. This led to number of complications:
  79  *
  80  *     . hash is not unique, so it cannot be used to index cached directory
  81  *     pages on the client (note, that it requires a whole pageful of hash
  82  *     collided entries to cause two pages to have identical hashes);
  83  *
  84  *     . hash is not unique, so it cannot, strictly speaking, be used as an
  85  *     entry cookie. ext3/htree has the same problem and lustre implementation
  86  *     mimics their solution: seekdir(hash) positions directory at the first
  87  *     entry with the given hash.
  88  *
  89  * Client side.
  90  *
  91  * 0. caching
  92  *
  93  * Client caches directory pages using hash of the first entry as an index. As
  94  * noted above hash is not unique, so this solution doesn't work as is:
  95  * special processing is needed for "page hash chains" (i.e., sequences of
  96  * pages filled with entries all having the same hash value).
  97  *
  98  * First, such chains have to be detected. To this end, server returns to the
  99  * client the hash of the first entry on the page next to one returned. When
 100  * client detects that this hash is the same as hash of the first entry on the
 101  * returned page, page hash collision has to be handled. Pages in the
 102  * hash chain, except first one, are termed "overflow pages".
 103  *
 104  * Solution to index uniqueness problem is to not cache overflow
 105  * pages. Instead, when page hash collision is detected, all overflow pages
 106  * from emerging chain are immediately requested from the server and placed in
 107  * a special data structure (struct ll_dir_chain). This data structure is used
 108  * by ll_readdir() to process entries from overflow pages. When readdir
 109  * invocation finishes, overflow pages are discarded. If page hash collision
 110  * chain weren't completely processed, next call to readdir will again detect
 111  * page hash collision, again read overflow pages in, process next portion of
 112  * entries and again discard the pages. This is not as wasteful as it looks,
 113  * because, given reasonable hash, page hash collisions are extremely rare.
 114  *
 115  * 1. directory positioning
 116  *
 117  * When seekdir(hash) is called, original
 118  *
 119  *
 120  *
 121  *
 122  *
 123  *
 124  *
 125  *
 126  * Server.
 127  *
 128  * identification of and access to overflow pages
 129  *
 130  * page format
 131  *
 132  * Page in MDS_READPAGE RPC is packed in LU_PAGE_SIZE, and each page contains
 133  * a header lu_dirpage which describes the start/end hash, and whether this
 134  * page is empty (contains no dir entry) or hash collide with next page.
 135  * After client receives reply, several pages will be integrated into dir page
 136  * in CFS_PAGE_SIZE (if CFS_PAGE_SIZE greater than LU_PAGE_SIZE), and the
 137  * lu_dirpage for this integrated page will be adjusted.
 138  *
 139  */
 140
 141 /* returns the page unlocked, but with a reference */
 142 static int ll_dir_readpage(struct file *file, struct page *page0)
 143 {
 144         struct inode *inode = page0->mapping->host;
 145         int hash64 = ll_i2sbi(inode)->ll_flags & LL_SBI_64BIT_HASH;
 146         struct obd_export *exp = ll_i2sbi(inode)->ll_md_exp;
 147         struct ptlrpc_request *request;
 148         struct mdt_body *body;
 149         struct md_op_data *op_data;
 150         __u64 hash;
 151         struct page **page_pool;
 152         struct page *page;
 153 #ifndef HAVE_ADD_TO_PAGE_CACHE_LRU
 154         struct pagevec lru_pvec;
 155 #endif
 156         struct lu_dirpage *dp;
 157         int max_pages = ll_i2sbi(inode)->ll_md_brw_size >> CFS_PAGE_SHIFT;
 158         int nrdpgs = 0; /* number of pages read actually */
 159         int npages;
 160         int i;
 161         int rc;
 162         ENTRY;
 163
 164         if (file) {
 165                 struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
 166
 167                 hash = fd->fd_dir.lfd_next;
 168         } else {
 169                 hash = ll_i2info(inode)->lli_sa_pos;
 170         }
 171         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) hash "LPU64"\n",
 172                inode->i_ino, inode->i_generation, inode, hash);
 173
 174         LASSERT(max_pages > 0 && max_pages <= PTLRPC_MAX_BRW_PAGES);
 175
 176         OBD_ALLOC(page_pool, sizeof(page) * max_pages);
 177         if (page_pool != NULL) {
 178                 page_pool[0] = page0;
 179         } else {
 180                 page_pool = &page0;
 181                 max_pages = 1;
 182         }
 183         for (npages = 1; npages < max_pages; npages++) {
 184                 page = page_cache_alloc_cold(inode->i_mapping);
 185                 if (!page)
 186                         break;
 187                 page_pool[npages] = page;
 188         }
 189
 190         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
 191                                      LUSTRE_OPC_ANY, NULL);
 192         op_data->op_npages = npages;
 193         op_data->op_offset = hash;
 194         rc = md_readpage(exp, op_data, page_pool, &request);
 195         ll_finish_md_op_data(op_data);
 196         if (rc == 0) {
 197                 body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
 198                 /* Checked by mdc_readpage() */
 199                 LASSERT(body != NULL);
 200
 201                 if (body->valid & OBD_MD_FLSIZE)
 202                         cl_isize_write(inode, body->size);
 203
 204                 nrdpgs = (request->rq_bulk->bd_nob_transferred+CFS_PAGE_SIZE-1)
 205                          >> CFS_PAGE_SHIFT;
 206                 SetPageUptodate(page0);
 207         }
 208         unlock_page(page0);
 209         ptlrpc_req_finished(request);
 210
 211         CDEBUG(D_VFSTRACE, "read %d/%d pages\n", nrdpgs, npages);
 212
 213         ll_pagevec_init(&lru_pvec, 0);
 214         for (i = 1; i < npages; i++) {
 215                 unsigned long offset;
 216                 int ret;
 217
 218                 page = page_pool[i];
 219
 220                 if (rc < 0 || i >= nrdpgs) {
 221                         page_cache_release(page);
 222                         continue;
 223                 }
 224
 225                 SetPageUptodate(page);
 226
 227                 dp = cfs_kmap(page);
 228                 hash = le64_to_cpu(dp->ldp_hash_start);
 229                 cfs_kunmap(page);
 230
 231                 offset = hash_x_index(hash, hash64);
 232
 233                 prefetchw(&page->flags);
 234                 ret = ll_add_to_page_cache_lru(page, inode->i_mapping, offset,
 235                                                GFP_KERNEL);
 236                 if (ret == 0) {
 237                         unlock_page(page);
 238                         if (ll_pagevec_add(&lru_pvec, page) == 0)
 239                                 ll_pagevec_lru_add_file(&lru_pvec);
 240                 } else {
 241                         CDEBUG(D_VFSTRACE, "page %lu add to page cache failed:"
 242                                " %d\n", offset, ret);
 243                 }
 244                 page_cache_release(page);
 245         }
 246         ll_pagevec_lru_add_file(&lru_pvec);
 247
 248         if (page_pool != &page0)
 249                 OBD_FREE(page_pool, sizeof(struct page *) * max_pages);
 250         EXIT;
 251         return rc;
 252 }
 253
 254 #ifndef MS_HAS_NEW_AOPS
 255 struct address_space_operations ll_dir_aops = {
 256         .readpage  = ll_dir_readpage,
 257 };
 258 #else
 259 struct address_space_operations_ext ll_dir_aops = {
 260         .orig_aops.readpage  = ll_dir_readpage,
 261 };
 262 #endif
 263
 264 static void ll_check_page(struct inode *dir, struct page *page)
 265 {
 266         /* XXX: check page format later */
 267         SetPageChecked(page);
 268 }
 269
 270 void ll_release_page(struct page *page, int remove)
 271 {
 272         kunmap(page);
 273         if (remove) {
 274                 lock_page(page);
 275                 if (likely(page->mapping != NULL))
 276                         truncate_complete_page(page->mapping, page);
 277                 unlock_page(page);
 278         }
 279         page_cache_release(page);
 280 }
 281
 282 /*
 283  * Find, kmap and return page that contains given hash.
 284  */
 285 static struct page *ll_dir_page_locate(struct inode *dir, __u64 *hash,
 286                                        __u64 *start, __u64 *end)
 287 {
 288         int hash64 = ll_i2sbi(dir)->ll_flags & LL_SBI_64BIT_HASH;
 289         struct address_space *mapping = dir->i_mapping;
 290         /*
 291          * Complement of hash is used as an index so that
 292          * radix_tree_gang_lookup() can be used to find a page with starting
 293          * hash _smaller_ than one we are looking for.
 294          */
 295         unsigned long offset = hash_x_index(*hash, hash64);
 296         struct page *page;
 297         int found;
 298
 299         TREE_READ_LOCK_IRQ(mapping);
 300         found = radix_tree_gang_lookup(&mapping->page_tree,
 301                                        (void **)&page, offset, 1);
 302         if (found > 0) {
 303                 struct lu_dirpage *dp;
 304
 305                 page_cache_get(page);
 306                 TREE_READ_UNLOCK_IRQ(mapping);
 307                 /*
 308                  * In contrast to find_lock_page() we are sure that directory
 309                  * page cannot be truncated (while DLM lock is held) and,
 310                  * hence, can avoid restart.
 311                  *
 312                  * In fact, page cannot be locked here at all, because
 313                  * ll_dir_readpage() does synchronous io.
 314                  */
 315                 wait_on_page(page);
 316                 if (PageUptodate(page)) {
 317                         dp = cfs_kmap(page);
 318                         if (BITS_PER_LONG == 32 && hash64) {
 319                                 *start = le64_to_cpu(dp->ldp_hash_start) >> 32;
 320                                 *end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
 321                                 *hash  = *hash >> 32;
 322                         } else {
 323                                 *start = le64_to_cpu(dp->ldp_hash_start);
 324                                 *end   = le64_to_cpu(dp->ldp_hash_end);
 325                         }
 326                         LASSERTF(*start <= *hash, "start = "LPX64",end = "
 327                                  LPX64",hash = "LPX64"\n", *start, *end, *hash);
 328                         CDEBUG(D_VFSTRACE, "page %lu [%llu %llu], hash "LPU64"\n",
 329                                offset, *start, *end, *hash);
 330                         if (*hash > *end) {
 331                                 ll_release_page(page, 0);
 332                                 page = NULL;
 333                         } else if (*end != *start && *hash == *end) {
 334                                 /*
 335                                  * upon hash collision, remove this page,
 336                                  * otherwise put page reference, and
 337                                  * ll_get_dir_page() will issue RPC to fetch
 338                                  * the page we want.
 339                                  */
 340                                 ll_release_page(page,
 341                                     le32_to_cpu(dp->ldp_flags) & LDF_COLLIDE);
 342                                 page = NULL;
 343                         }
 344                 } else {
 345                         page_cache_release(page);
 346                         page = ERR_PTR(-EIO);
 347                 }
 348
 349         } else {
 350                 TREE_READ_UNLOCK_IRQ(mapping);
 351                 page = NULL;
 352         }
 353         return page;
 354 }
 355
 356 struct page *ll_get_dir_page(struct file *filp, struct inode *dir, __u64 hash,
 357                              struct ll_dir_chain *chain)
 358 {
 359         ldlm_policy_data_t policy = {.l_inodebits = {MDS_INODELOCK_UPDATE} };
 360         struct address_space *mapping = dir->i_mapping;
 361         struct lustre_handle lockh;
 362         struct lu_dirpage *dp;
 363         struct page *page;
 364         ldlm_mode_t mode;
 365         int rc;
 366         __u64 start = 0;
 367         __u64 end = 0;
 368         __u64 lhash = hash;
 369         struct ll_inode_info *lli = ll_i2info(dir);
 370         int hash64 = ll_i2sbi(dir)->ll_flags & LL_SBI_64BIT_HASH;
 371
 372         mode = LCK_PR;
 373         rc = md_lock_match(ll_i2sbi(dir)->ll_md_exp, LDLM_FL_BLOCK_GRANTED,
 374                            ll_inode2fid(dir), LDLM_IBITS, &policy, mode, &lockh);
 375         if (!rc) {
 376                 struct ldlm_enqueue_info einfo = { LDLM_IBITS, mode,
 377                        ll_md_blocking_ast, ldlm_completion_ast,
 378                        NULL, NULL, dir };
 379                 struct lookup_intent it = { .it_op = IT_READDIR };
 380                 struct ptlrpc_request *request;
 381                 struct md_op_data *op_data;
 382
 383                 op_data = ll_prep_md_op_data(NULL, dir, NULL, NULL, 0, 0,
 384                                              LUSTRE_OPC_ANY, NULL);
 385                 if (IS_ERR(op_data))
 386                         return (void *)op_data;
 387
 388                 rc = md_enqueue(ll_i2sbi(dir)->ll_md_exp, &einfo, &it,
 389                                 op_data, &lockh, NULL, 0, NULL, 0);
 390
 391                 ll_finish_md_op_data(op_data);
 392
 393                 request = (struct ptlrpc_request *)it.d.lustre.it_data;
 394                 if (request)
 395                         ptlrpc_req_finished(request);
 396                 if (rc < 0) {
 397                         CERROR("lock enqueue: "DFID" at "LPU64": rc %d\n",
 398                                PFID(ll_inode2fid(dir)), hash, rc);
 399                         return ERR_PTR(rc);
 400                 }
 401         } else {
 402                 /* for cross-ref object, l_ast_data of the lock may not be set,
 403                  * we reset it here */
 404                 md_set_lock_data(ll_i2sbi(dir)->ll_md_exp, &lockh.cookie,
 405                                  dir, NULL);
 406         }
 407         ldlm_lock_dump_handle(D_OTHER, &lockh);
 408
 409         cfs_mutex_lock(&lli->lli_readdir_mutex);
 410         page = ll_dir_page_locate(dir, &lhash, &start, &end);
 411         if (IS_ERR(page)) {
 412                 CERROR("dir page locate: "DFID" at "LPU64": rc %ld\n",
 413                        PFID(ll_inode2fid(dir)), lhash, PTR_ERR(page));
 414                 GOTO(out_unlock, page);
 415         } else if (page != NULL) {
 416                 /*
 417                  * XXX nikita: not entirely correct handling of a corner case:
 418                  * suppose hash chain of entries with hash value HASH crosses
 419                  * border between pages P0 and P1. First both P0 and P1 are
 420                  * cached, seekdir() is called for some entry from the P0 part
 421                  * of the chain. Later P0 goes out of cache. telldir(HASH)
 422                  * happens and finds P1, as it starts with matching hash
 423                  * value. Remaining entries from P0 part of the chain are
 424                  * skipped. (Is that really a bug?)
 425                  *
 426                  * Possible solutions: 0. don't cache P1 is such case, handle
 427                  * it as an "overflow" page. 1. invalidate all pages at
 428                  * once. 2. use HASH|1 as an index for P1.
 429                  */
 430                 GOTO(hash_collision, page);
 431         }
 432
 433         page = read_cache_page(mapping, hash_x_index(hash, hash64),
 434                                (filler_t*)mapping->a_ops->readpage, filp);
 435         if (IS_ERR(page)) {
 436                 CERROR("read cache page: "DFID" at "LPU64": rc %ld\n",
 437                        PFID(ll_inode2fid(dir)), hash, PTR_ERR(page));
 438                 GOTO(out_unlock, page);
 439         }
 440
 441         wait_on_page(page);
 442         (void)kmap(page);
 443         if (!PageUptodate(page)) {
 444                 CERROR("page not updated: "DFID" at "LPU64": rc %d\n",
 445                        PFID(ll_inode2fid(dir)), hash, -5);
 446                 goto fail;
 447         }
 448         if (!PageChecked(page))
 449                 ll_check_page(dir, page);
 450         if (PageError(page)) {
 451                 CERROR("page error: "DFID" at "LPU64": rc %d\n",
 452                        PFID(ll_inode2fid(dir)), hash, -5);
 453                 goto fail;
 454         }
 455 hash_collision:
 456         dp = page_address(page);
 457         if (BITS_PER_LONG == 32 && hash64) {
 458                 start = le64_to_cpu(dp->ldp_hash_start) >> 32;
 459                 end   = le64_to_cpu(dp->ldp_hash_end) >> 32;
 460                 lhash = hash >> 32;
 461         } else {
 462                 start = le64_to_cpu(dp->ldp_hash_start);
 463                 end   = le64_to_cpu(dp->ldp_hash_end);
 464                 lhash = hash;
 465         }
 466         if (end == start) {
 467                 LASSERT(start == lhash);
 468                 CWARN("Page-wide hash collision: "LPU64"\n", end);
 469                 if (BITS_PER_LONG == 32 && hash64)
 470                         CWARN("Real page-wide hash collision at ["LPU64" "LPU64
 471                               "] with hash "LPU64"\n",
 472                               le64_to_cpu(dp->ldp_hash_start),
 473                               le64_to_cpu(dp->ldp_hash_end), hash);
 474                 /*
 475                  * Fetch whole overflow chain...
 476                  *
 477                  * XXX not yet.
 478                  */
 479                 goto fail;
 480         }
 481 out_unlock:
 482         cfs_mutex_unlock(&lli->lli_readdir_mutex);
 483         ldlm_lock_decref(&lockh, mode);
 484         return page;
 485
 486 fail:
 487         ll_release_page(page, 1);
 488         page = ERR_PTR(-EIO);
 489         goto out_unlock;
 490 }
 491
 492 int ll_readdir(struct file *filp, void *cookie, filldir_t filldir)
 493 {
 494         struct inode         *inode      = filp->f_dentry->d_inode;
 495         struct ll_inode_info *info       = ll_i2info(inode);
 496         struct ll_sb_info    *sbi        = ll_i2sbi(inode);
 497         struct ll_file_data  *fd         = LUSTRE_FPRIVATE(filp);
 498         __u64                 pos        = fd->fd_dir.lfd_pos;
 499         int                   api32      = ll_need_32bit_api(sbi);
 500         int                   hash64     = sbi->ll_flags & LL_SBI_64BIT_HASH;
 501         struct page          *page;
 502         struct ll_dir_chain   chain;
 503         int                   done;
 504         int                   rc;
 505         ENTRY;
 506
 507         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) pos %lu/%llu 32bit_api %d\n",
 508                inode->i_ino, inode->i_generation, inode,
 509                (unsigned long)pos, i_size_read(inode), api32);
 510
 511         if (pos == MDS_DIR_END_OFF)
 512                 /*
 513                  * end-of-file.
 514                  */
 515                 GOTO(out, rc = 0);
 516
 517         rc    = 0;
 518         done  = 0;
 519         ll_dir_chain_init(&chain);
 520
 521         fd->fd_dir.lfd_next = pos;
 522         page = ll_get_dir_page(filp, inode, pos, &chain);
 523
 524         while (rc == 0 && !done) {
 525                 struct lu_dirpage *dp;
 526                 struct lu_dirent  *ent;
 527
 528                 if (!IS_ERR(page)) {
 529                         /*
 530                          * If page is empty (end of directory is reached),
 531                          * use this value.
 532                          */
 533                         __u64 hash = MDS_DIR_END_OFF;
 534                         __u64 next;
 535
 536                         dp = page_address(page);
 537                         for (ent = lu_dirent_start(dp); ent != NULL && !done;
 538                              ent = lu_dirent_next(ent)) {
 539                                 __u16          type;
 540                                 int            namelen;
 541                                 struct lu_fid  fid;
 542                                 __u64          lhash;
 543                                 __u64          ino;
 544
 545                                 /*
 546                                  * XXX: implement correct swabbing here.
 547                                  */
 548
 549                                 hash = le64_to_cpu(ent->lde_hash);
 550                                 if (hash < pos)
 551                                         /*
 552                                          * Skip until we find target hash
 553                                          * value.
 554                                          */
 555                                         continue;
 556
 557                                 namelen = le16_to_cpu(ent->lde_namelen);
 558                                 if (namelen == 0)
 559                                         /*
 560                                          * Skip dummy record.
 561                                          */
 562                                         continue;
 563
 564                                 if (api32 && hash64)
 565                                         lhash = hash >> 32;
 566                                 else
 567                                         lhash = hash;
 568                                 fid_le_to_cpu(&fid, &ent->lde_fid);
 569                                 ino = cl_fid_build_ino(&fid, api32);
 570                                 type = ll_dirent_type_get(ent);
 571                                 /* For 'll_nfs_get_name_filldir()', it will try
 572                                  * to access the 'ent' through its 'lde_name',
 573                                  * so the parameter 'name' for 'filldir()' must
 574                                  * be part of the 'ent'. */
 575                                 done = filldir(cookie, ent->lde_name, namelen,
 576                                                lhash, ino, type);
 577                         }
 578                         next = le64_to_cpu(dp->ldp_hash_end);
 579                         if (!done) {
 580                                 pos = next;
 581                                 if (pos == MDS_DIR_END_OFF) {
 582                                         /*
 583                                          * End of directory reached.
 584                                          */
 585                                         done = 1;
 586                                         ll_release_page(page, 0);
 587                                 } else if (1 /* chain is exhausted*/) {
 588                                         /*
 589                                          * Normal case: continue to the next
 590                                          * page.
 591                                          */
 592                                         ll_release_page(page,
 593                                             le32_to_cpu(dp->ldp_flags) &
 594                                                         LDF_COLLIDE);
 595                                         fd->fd_dir.lfd_next = pos;
 596                                         page = ll_get_dir_page(filp, inode, pos,
 597                                                                &chain);
 598                                 } else {
 599                                         /*
 600                                          * go into overflow page.
 601                                          */
 602                                         LASSERT(le32_to_cpu(dp->ldp_flags) &
 603                                                 LDF_COLLIDE);
 604                                         ll_release_page(page, 1);
 605                                 }
 606                         } else {
 607                                 pos = hash;
 608                                 ll_release_page(page, 0);
 609                         }
 610                 } else {
 611                         rc = PTR_ERR(page);
 612                         CERROR("error reading dir "DFID" at %lu: rc %d\n",
 613                                PFID(&info->lli_fid), (unsigned long)pos, rc);
 614                 }
 615         }
 616
 617         fd->fd_dir.lfd_pos = pos;
 618         if (pos == MDS_DIR_END_OFF) {
 619                 if (api32)
 620                         filp->f_pos = LL_DIR_END_OFF_32BIT;
 621                 else
 622                         filp->f_pos = LL_DIR_END_OFF;
 623         } else {
 624                 if (api32 && hash64)
 625                         filp->f_pos = pos >> 32;
 626                 else
 627                         filp->f_pos = pos;
 628         }
 629         filp->f_version = inode->i_version;
 630         touch_atime(filp->f_vfsmnt, filp->f_dentry);
 631
 632         ll_dir_chain_fini(&chain);
 633
 634 out:
 635         if (!rc)
 636                 ll_stats_ops_tally(sbi, LPROC_LL_READDIR, 1);
 637
 638         RETURN(rc);
 639 }
 640
 641 int ll_send_mgc_param(struct obd_export *mgc, char *string)
 642 {
 643         struct mgs_send_param *msp;
 644         int rc = 0;
 645
 646         OBD_ALLOC_PTR(msp);
 647         if (!msp)
 648                 return -ENOMEM;
 649
 650         strncpy(msp->mgs_param, string, MGS_PARAM_MAXLEN);
 651         rc = obd_set_info_async(NULL, mgc, sizeof(KEY_SET_INFO), KEY_SET_INFO,
 652                                 sizeof(struct mgs_send_param), msp, NULL);
 653         if (rc)
 654                 CERROR("Failed to set parameter: %d\n", rc);
 655         OBD_FREE_PTR(msp);
 656
 657         return rc;
 658 }
 659
 660 char *ll_get_fsname(struct inode *inode)
 661 {
 662         struct lustre_sb_info *lsi = s2lsi(inode->i_sb);
 663         char *ptr, *fsname;
 664         int len;
 665
 666         OBD_ALLOC(fsname, MGS_PARAM_MAXLEN);
 667         len = strlen(lsi->lsi_lmd->lmd_profile);
 668         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
 669         if (ptr && (strcmp(ptr, "-client") == 0))
 670                 len -= 7;
 671         strncpy(fsname, lsi->lsi_lmd->lmd_profile, len);
 672         fsname[len] = '\0';
 673
 674         return fsname;
 675 }
 676
 677 int ll_dir_setstripe(struct inode *inode, struct lov_user_md *lump,
 678                      int set_default)
 679 {
 680         struct ll_sb_info *sbi = ll_i2sbi(inode);
 681         struct md_op_data *op_data;
 682         struct ptlrpc_request *req = NULL;
 683         int rc = 0;
 684         struct lustre_sb_info *lsi = s2lsi(inode->i_sb);
 685         struct obd_device *mgc = lsi->lsi_mgc;
 686         char *fsname = NULL, *param = NULL;
 687         int lum_size;
 688
 689         if (lump != NULL) {
 690                 /*
 691                  * This is coming from userspace, so should be in
 692                  * local endian.  But the MDS would like it in little
 693                  * endian, so we swab it before we send it.
 694                  */
 695                 switch (lump->lmm_magic) {
 696                 case LOV_USER_MAGIC_V1: {
 697                         if (lump->lmm_magic != cpu_to_le32(LOV_USER_MAGIC_V1))
 698                                 lustre_swab_lov_user_md_v1(lump);
 699                         lum_size = sizeof(struct lov_user_md_v1);
 700                         break;
 701                         }
 702                 case LOV_USER_MAGIC_V3: {
 703                         if (lump->lmm_magic != cpu_to_le32(LOV_USER_MAGIC_V3))
 704                                 lustre_swab_lov_user_md_v3(
 705                                         (struct lov_user_md_v3 *)lump);
 706                         lum_size = sizeof(struct lov_user_md_v3);
 707                         break;
 708                         }
 709                 default: {
 710                         CDEBUG(D_IOCTL, "bad userland LOV MAGIC:"
 711                                         " %#08x != %#08x nor %#08x\n",
 712                                         lump->lmm_magic, LOV_USER_MAGIC_V1,
 713                                         LOV_USER_MAGIC_V3);
 714                         RETURN(-EINVAL);
 715                         }
 716                }
 717         } else {
 718                 lum_size = sizeof(struct lov_user_md_v1);
 719         }
 720
 721         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
 722                                      LUSTRE_OPC_ANY, NULL);
 723         if (IS_ERR(op_data))
 724                 RETURN(PTR_ERR(op_data));
 725
 726         /* swabbing is done in lov_setstripe() on server side */
 727         rc = md_setattr(sbi->ll_md_exp, op_data, lump, lum_size,
 728                         NULL, 0, &req, NULL);
 729         ll_finish_md_op_data(op_data);
 730         ptlrpc_req_finished(req);
 731         if (rc) {
 732                 if (rc != -EPERM && rc != -EACCES)
 733                         CERROR("mdc_setattr fails: rc = %d\n", rc);
 734         }
 735
 736         /* In the following we use the fact that LOV_USER_MAGIC_V1 and
 737          LOV_USER_MAGIC_V3 have the same initial fields so we do not
 738          need the make the distiction between the 2 versions */
 739         if (set_default && mgc->u.cli.cl_mgc_mgsexp) {
 740                 OBD_ALLOC(param, MGS_PARAM_MAXLEN);
 741
 742                 /* Get fsname and assume devname to be -MDT0000. */
 743                 fsname = ll_get_fsname(inode);
 744                 /* Set root stripesize */
 745                 sprintf(param, "%s-MDT0000.lov.stripesize=%u", fsname,
 746                         lump ? le32_to_cpu(lump->lmm_stripe_size) : 0);
 747                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 748                 if (rc)
 749                         goto end;
 750
 751                 /* Set root stripecount */
 752                 sprintf(param, "%s-MDT0000.lov.stripecount=%hd", fsname,
 753                         lump ? le16_to_cpu(lump->lmm_stripe_count) : 0);
 754                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 755                 if (rc)
 756                         goto end;
 757
 758                 /* Set root stripeoffset */
 759                 sprintf(param, "%s-MDT0000.lov.stripeoffset=%hd", fsname,
 760                         lump ? le16_to_cpu(lump->lmm_stripe_offset) :
 761                         (typeof(lump->lmm_stripe_offset))(-1));
 762                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 763                 if (rc)
 764                         goto end;
 765 end:
 766                 if (fsname)
 767                         OBD_FREE(fsname, MGS_PARAM_MAXLEN);
 768                 if (param)
 769                         OBD_FREE(param, MGS_PARAM_MAXLEN);
 770         }
 771         return rc;
 772 }
 773
 774 int ll_dir_getstripe(struct inode *inode, struct lov_mds_md **lmmp,
 775                      int *lmm_size, struct ptlrpc_request **request)
 776 {
 777         struct ll_sb_info *sbi = ll_i2sbi(inode);
 778         struct mdt_body   *body;
 779         struct lov_mds_md *lmm = NULL;
 780         struct ptlrpc_request *req = NULL;
 781         int rc, lmmsize;
 782         struct md_op_data *op_data;
 783
 784         rc = ll_get_max_mdsize(sbi, &lmmsize);
 785         if (rc)
 786                 RETURN(rc);
 787
 788         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL,
 789                                      0, lmmsize, LUSTRE_OPC_ANY,
 790                                      NULL);
 791         if (IS_ERR(op_data))
 792                 RETURN(PTR_ERR(op_data));
 793
 794         op_data->op_valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA;
 795         rc = md_getattr(sbi->ll_md_exp, op_data, &req);
 796         ll_finish_md_op_data(op_data);
 797         if (rc < 0) {
 798                 CDEBUG(D_INFO, "md_getattr failed on inode "
 799                        "%lu/%u: rc %d\n", inode->i_ino,
 800                        inode->i_generation, rc);
 801                 GOTO(out, rc);
 802         }
 803
 804         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 805         LASSERT(body != NULL);
 806
 807         lmmsize = body->eadatasize;
 808
 809         if (!(body->valid & (OBD_MD_FLEASIZE | OBD_MD_FLDIREA)) ||
 810             lmmsize == 0) {
 811                 GOTO(out, rc = -ENODATA);
 812         }
 813
 814         lmm = req_capsule_server_sized_get(&req->rq_pill,
 815                                            &RMF_MDT_MD, lmmsize);
 816         LASSERT(lmm != NULL);
 817
 818         /*
 819          * This is coming from the MDS, so is probably in
 820          * little endian.  We convert it to host endian before
 821          * passing it to userspace.
 822          */
 823         /* We don't swab objects for directories */
 824         switch (le32_to_cpu(lmm->lmm_magic)) {
 825         case LOV_MAGIC_V1:
 826                 if (LOV_MAGIC != cpu_to_le32(LOV_MAGIC))
 827                         lustre_swab_lov_user_md_v1((struct lov_user_md_v1 *)lmm);
 828                 break;
 829         case LOV_MAGIC_V3:
 830                 if (LOV_MAGIC != cpu_to_le32(LOV_MAGIC))
 831                         lustre_swab_lov_user_md_v3((struct lov_user_md_v3 *)lmm);
 832                 break;
 833         default:
 834                 CERROR("unknown magic: %lX\n", (unsigned long)lmm->lmm_magic);
 835                 rc = -EPROTO;
 836         }
 837 out:
 838         *lmmp = lmm;
 839         *lmm_size = lmmsize;
 840         *request = req;
 841         return rc;
 842 }
 843
 844 /*
 845  *  Get MDT index for the inode.
 846  */
 847 int ll_get_mdt_idx(struct inode *inode)
 848 {
 849         struct ll_sb_info *sbi = ll_i2sbi(inode);
 850         struct md_op_data *op_data;
 851         int rc, mdtidx;
 852         ENTRY;
 853
 854         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0,
 855                                      0, LUSTRE_OPC_ANY, NULL);
 856         if (IS_ERR(op_data))
 857                 RETURN(PTR_ERR(op_data));
 858
 859         op_data->op_valid |= OBD_MD_MDTIDX;
 860         rc = md_getattr(sbi->ll_md_exp, op_data, NULL);
 861         mdtidx = op_data->op_mds;
 862         ll_finish_md_op_data(op_data);
 863         if (rc < 0) {
 864                 CDEBUG(D_INFO, "md_getattr_name: %d\n", rc);
 865                 RETURN(rc);
 866         }
 867         return mdtidx;
 868 }
 869
 870 static int copy_and_ioctl(int cmd, struct obd_export *exp, void *data, int len)
 871 {
 872         void *ptr;
 873         int rc;
 874
 875         OBD_ALLOC(ptr, len);
 876         if (ptr == NULL)
 877                 return -ENOMEM;
 878         if (cfs_copy_from_user(ptr, data, len)) {
 879                 OBD_FREE(ptr, len);
 880                 return -EFAULT;
 881         }
 882         rc = obd_iocontrol(cmd, exp, len, data, NULL);
 883         OBD_FREE(ptr, len);
 884         return rc;
 885 }
 886
 887 static int quotactl_ioctl(struct ll_sb_info *sbi, struct if_quotactl *qctl)
 888 {
 889         int cmd = qctl->qc_cmd;
 890         int type = qctl->qc_type;
 891         int id = qctl->qc_id;
 892         int valid = qctl->qc_valid;
 893         int rc = 0;
 894         ENTRY;
 895
 896         switch (cmd) {
 897         case LUSTRE_Q_INVALIDATE:
 898         case LUSTRE_Q_FINVALIDATE:
 899         case Q_QUOTAON:
 900         case Q_QUOTAOFF:
 901         case Q_SETQUOTA:
 902         case Q_SETINFO:
 903                 if (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
 904                     sbi->ll_flags & LL_SBI_RMT_CLIENT)
 905                         RETURN(-EPERM);
 906                 break;
 907         case Q_GETQUOTA:
 908                 if (((type == USRQUOTA && cfs_curproc_euid() != id) ||
 909                      (type == GRPQUOTA && !in_egroup_p(id))) &&
 910                     (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
 911                      sbi->ll_flags & LL_SBI_RMT_CLIENT))
 912                         RETURN(-EPERM);
 913                 break;
 914         case Q_GETINFO:
 915                 break;
 916         default:
 917                 CERROR("unsupported quotactl op: %#x\n", cmd);
 918                 RETURN(-ENOTTY);
 919         }
 920
 921         if (valid != QC_GENERAL) {
 922                 if (sbi->ll_flags & LL_SBI_RMT_CLIENT)
 923                         RETURN(-EOPNOTSUPP);
 924
 925                 if (cmd == Q_GETINFO)
 926                         qctl->qc_cmd = Q_GETOINFO;
 927                 else if (cmd == Q_GETQUOTA)
 928                         qctl->qc_cmd = Q_GETOQUOTA;
 929                 else
 930                         RETURN(-EINVAL);
 931
 932                 switch (valid) {
 933                 case QC_MDTIDX:
 934                         rc = obd_iocontrol(OBD_IOC_QUOTACTL, sbi->ll_md_exp,
 935                                            sizeof(*qctl), qctl, NULL);
 936                         break;
 937                 case QC_OSTIDX:
 938                         rc = obd_iocontrol(OBD_IOC_QUOTACTL, sbi->ll_dt_exp,
 939                                            sizeof(*qctl), qctl, NULL);
 940                         break;
 941                 case QC_UUID:
 942                         rc = obd_iocontrol(OBD_IOC_QUOTACTL, sbi->ll_md_exp,
 943                                            sizeof(*qctl), qctl, NULL);
 944                         if (rc == -EAGAIN)
 945                                 rc = obd_iocontrol(OBD_IOC_QUOTACTL,
 946                                                    sbi->ll_dt_exp,
 947                                                    sizeof(*qctl), qctl, NULL);
 948                         break;
 949                 default:
 950                         rc = -EINVAL;
 951                         break;
 952                 }
 953
 954                 if (rc)
 955                         RETURN(rc);
 956
 957                 qctl->qc_cmd = cmd;
 958         } else {
 959                 struct obd_quotactl *oqctl;
 960
 961                 OBD_ALLOC_PTR(oqctl);
 962                 if (oqctl == NULL)
 963                         RETURN(-ENOMEM);
 964
 965                 QCTL_COPY(oqctl, qctl);
 966                 rc = obd_quotactl(sbi->ll_md_exp, oqctl);
 967                 if (rc) {
 968                         if (rc != -EALREADY && cmd == Q_QUOTAON) {
 969                                 oqctl->qc_cmd = Q_QUOTAOFF;
 970                                 obd_quotactl(sbi->ll_md_exp, oqctl);
 971                         }
 972                         OBD_FREE_PTR(oqctl);
 973                         RETURN(rc);
 974                 }
 975                 /* If QIF_SPACE is not set, client should collect the
 976                  * space usage from OSSs by itself */
 977                 if (cmd == Q_GETQUOTA &&
 978                     !(oqctl->qc_dqblk.dqb_valid & QIF_SPACE) &&
 979                     !oqctl->qc_dqblk.dqb_curspace) {
 980                         struct obd_quotactl *oqctl_tmp;
 981
 982                         OBD_ALLOC_PTR(oqctl_tmp);
 983                         if (oqctl_tmp == NULL)
 984                                 GOTO(out, rc = -ENOMEM);
 985
 986                         oqctl_tmp->qc_cmd = Q_GETOQUOTA;
 987                         oqctl_tmp->qc_id = oqctl->qc_id;
 988                         oqctl_tmp->qc_type = oqctl->qc_type;
 989
 990                         /* collect space usage from OSTs */
 991                         oqctl_tmp->qc_dqblk.dqb_curspace = 0;
 992                         rc = obd_quotactl(sbi->ll_dt_exp, oqctl_tmp);
 993                         if (!rc || rc == -EREMOTEIO) {
 994                                 oqctl->qc_dqblk.dqb_curspace =
 995                                         oqctl_tmp->qc_dqblk.dqb_curspace;
 996                                 oqctl->qc_dqblk.dqb_valid |= QIF_SPACE;
 997                         }
 998
 999                         /* collect space & inode usage from MDTs */
1000                         oqctl_tmp->qc_dqblk.dqb_curspace = 0;
1001                         oqctl_tmp->qc_dqblk.dqb_curinodes = 0;
1002                         rc = obd_quotactl(sbi->ll_md_exp, oqctl_tmp);
1003                         if (!rc || rc == -EREMOTEIO) {
1004                                 oqctl->qc_dqblk.dqb_curspace +=
1005                                         oqctl_tmp->qc_dqblk.dqb_curspace;
1006                                 oqctl->qc_dqblk.dqb_curinodes =
1007                                         oqctl_tmp->qc_dqblk.dqb_curinodes;
1008                                 oqctl->qc_dqblk.dqb_valid |= QIF_INODES;
1009                         } else {
1010                                 oqctl->qc_dqblk.dqb_valid &= ~QIF_SPACE;
1011                         }
1012
1013                         OBD_FREE_PTR(oqctl_tmp);
1014                 }
1015 out:
1016                 QCTL_COPY(qctl, oqctl);
1017                 OBD_FREE_PTR(oqctl);
1018         }
1019
1020         RETURN(rc);
1021 }
1022
1023 static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1024 {
1025         struct inode *inode = file->f_dentry->d_inode;
1026         struct ll_sb_info *sbi = ll_i2sbi(inode);
1027         struct obd_ioctl_data *data;
1028         int rc = 0;
1029         ENTRY;
1030
1031         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), cmd=%#x\n",
1032                inode->i_ino, inode->i_generation, inode, cmd);
1033
1034         /* asm-ppc{,64} declares TCGETS, et. al. as type 't' not 'T' */
1035         if (_IOC_TYPE(cmd) == 'T' || _IOC_TYPE(cmd) == 't') /* tty ioctls */
1036                 return -ENOTTY;
1037
1038         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_IOCTL, 1);
1039         switch(cmd) {
1040         case FSFILT_IOC_GETFLAGS:
1041         case FSFILT_IOC_SETFLAGS:
1042                 RETURN(ll_iocontrol(inode, file, cmd, arg));
1043         case FSFILT_IOC_GETVERSION_OLD:
1044         case FSFILT_IOC_GETVERSION:
1045                 RETURN(put_user(inode->i_generation, (int *)arg));
1046         /* We need to special case any other ioctls we want to handle,
1047          * to send them to the MDS/OST as appropriate and to properly
1048          * network encode the arg field.
1049         case FSFILT_IOC_SETVERSION_OLD:
1050         case FSFILT_IOC_SETVERSION:
1051         */
1052         case LL_IOC_GET_MDTIDX: {
1053                 int mdtidx;
1054
1055                 mdtidx = ll_get_mdt_idx(inode);
1056                 if (mdtidx < 0)
1057                         RETURN(mdtidx);
1058
1059                 if (put_user((int)mdtidx, (int*)arg))
1060                         RETURN(-EFAULT);
1061
1062                 return 0;
1063         }
1064         case IOC_MDC_LOOKUP: {
1065                 struct ptlrpc_request *request = NULL;
1066                 int namelen, len = 0;
1067                 char *buf = NULL;
1068                 char *filename;
1069                 struct md_op_data *op_data;
1070
1071                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
1072                 if (rc)
1073                         RETURN(rc);
1074                 data = (void *)buf;
1075
1076                 filename = data->ioc_inlbuf1;
1077                 namelen = strlen(filename);
1078
1079                 if (namelen < 1) {
1080                         CDEBUG(D_INFO, "IOC_MDC_LOOKUP missing filename\n");
1081                         GOTO(out_free, rc = -EINVAL);
1082                 }
1083
1084                 op_data = ll_prep_md_op_data(NULL, inode, NULL, filename, namelen,
1085                                              0, LUSTRE_OPC_ANY, NULL);
1086                 if (IS_ERR(op_data))
1087                         GOTO(out_free, rc = PTR_ERR(op_data));
1088
1089                 op_data->op_valid = OBD_MD_FLID;
1090                 rc = md_getattr_name(sbi->ll_md_exp, op_data, &request);
1091                 ll_finish_md_op_data(op_data);
1092                 if (rc < 0) {
1093                         CDEBUG(D_INFO, "md_getattr_name: %d\n", rc);
1094                         GOTO(out_free, rc);
1095                 }
1096                 ptlrpc_req_finished(request);
1097                 EXIT;
1098 out_free:
1099                 obd_ioctl_freedata(buf, len);
1100                 return rc;
1101         }
1102         case LL_IOC_LOV_SETSTRIPE: {
1103                 struct lov_user_md_v3 lumv3;
1104                 struct lov_user_md_v1 *lumv1 = (struct lov_user_md_v1 *)&lumv3;
1105                 struct lov_user_md_v1 *lumv1p = (struct lov_user_md_v1 *)arg;
1106                 struct lov_user_md_v3 *lumv3p = (struct lov_user_md_v3 *)arg;
1107
1108                 int set_default = 0;
1109
1110                 LASSERT(sizeof(lumv3) == sizeof(*lumv3p));
1111                 LASSERT(sizeof(lumv3.lmm_objects[0]) ==
1112                         sizeof(lumv3p->lmm_objects[0]));
1113                 /* first try with v1 which is smaller than v3 */
1114                 if (cfs_copy_from_user(lumv1, lumv1p, sizeof(*lumv1)))
1115                         RETURN(-EFAULT);
1116
1117                 if (lumv1->lmm_magic == LOV_USER_MAGIC_V3) {
1118                         if (cfs_copy_from_user(&lumv3, lumv3p, sizeof(lumv3)))
1119                                 RETURN(-EFAULT);
1120                 }
1121
1122                 if (inode->i_sb->s_root == file->f_dentry)
1123                         set_default = 1;
1124
1125                 /* in v1 and v3 cases lumv1 points to data */
1126                 rc = ll_dir_setstripe(inode, lumv1, set_default);
1127
1128                 RETURN(rc);
1129         }
1130         case LL_IOC_OBD_STATFS:
1131                 RETURN(ll_obd_statfs(inode, (void *)arg));
1132         case LL_IOC_LOV_GETSTRIPE:
1133         case LL_IOC_MDC_GETINFO:
1134         case IOC_MDC_GETFILEINFO:
1135         case IOC_MDC_GETFILESTRIPE: {
1136                 struct ptlrpc_request *request = NULL;
1137                 struct lov_user_md *lump;
1138                 struct lov_mds_md *lmm = NULL;
1139                 struct mdt_body *body;
1140                 char *filename = NULL;
1141                 int lmmsize;
1142
1143                 if (cmd == IOC_MDC_GETFILEINFO ||
1144                     cmd == IOC_MDC_GETFILESTRIPE) {
1145                         filename = getname((const char *)arg);
1146                         if (IS_ERR(filename))
1147                                 RETURN(PTR_ERR(filename));
1148
1149                         rc = ll_lov_getstripe_ea_info(inode, filename, &lmm,
1150                                                       &lmmsize, &request);
1151                 } else {
1152                         rc = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
1153                 }
1154
1155                 if (request) {
1156                         body = req_capsule_server_get(&request->rq_pill,
1157                                                       &RMF_MDT_BODY);
1158                         LASSERT(body != NULL);
1159                 } else {
1160                         GOTO(out_req, rc);
1161                 }
1162
1163                 if (rc < 0) {
1164                         if (rc == -ENODATA && (cmd == IOC_MDC_GETFILEINFO ||
1165                                                cmd == LL_IOC_MDC_GETINFO))
1166                                 GOTO(skip_lmm, rc = 0);
1167                         else
1168                                 GOTO(out_req, rc);
1169                 }
1170
1171                 if (cmd == IOC_MDC_GETFILESTRIPE ||
1172                     cmd == LL_IOC_LOV_GETSTRIPE) {
1173                         lump = (struct lov_user_md *)arg;
1174                 } else {
1175                         struct lov_user_mds_data *lmdp;
1176                         lmdp = (struct lov_user_mds_data *)arg;
1177                         lump = &lmdp->lmd_lmm;
1178                 }
1179                 if (cfs_copy_to_user(lump, lmm, lmmsize)) {
1180                         if (cfs_copy_to_user(lump, lmm, sizeof(*lump)))
1181                                 GOTO(out_req, rc = -EFAULT);
1182                         rc = -EOVERFLOW;
1183                 }
1184         skip_lmm:
1185                 if (cmd == IOC_MDC_GETFILEINFO || cmd == LL_IOC_MDC_GETINFO) {
1186                         struct lov_user_mds_data *lmdp;
1187                         lstat_t st = { 0 };
1188
1189                         st.st_dev     = inode->i_sb->s_dev;
1190                         st.st_mode    = body->mode;
1191                         st.st_nlink   = body->nlink;
1192                         st.st_uid     = body->uid;
1193                         st.st_gid     = body->gid;
1194                         st.st_rdev    = body->rdev;
1195                         st.st_size    = body->size;
1196                         st.st_blksize = CFS_PAGE_SIZE;
1197                         st.st_blocks  = body->blocks;
1198                         st.st_atime   = body->atime;
1199                         st.st_mtime   = body->mtime;
1200                         st.st_ctime   = body->ctime;
1201                         st.st_ino     = inode->i_ino;
1202
1203                         lmdp = (struct lov_user_mds_data *)arg;
1204                         if (cfs_copy_to_user(&lmdp->lmd_st, &st, sizeof(st)))
1205                                 GOTO(out_req, rc = -EFAULT);
1206                 }
1207
1208                 EXIT;
1209         out_req:
1210                 ptlrpc_req_finished(request);
1211                 if (filename)
1212                         putname(filename);
1213                 return rc;
1214         }
1215         case IOC_LOV_GETINFO: {
1216                 struct lov_user_mds_data *lumd;
1217                 struct lov_stripe_md *lsm;
1218                 struct lov_user_md *lum;
1219                 struct lov_mds_md *lmm;
1220                 int lmmsize;
1221                 lstat_t st;
1222
1223                 lumd = (struct lov_user_mds_data *)arg;
1224                 lum = &lumd->lmd_lmm;
1225
1226                 rc = ll_get_max_mdsize(sbi, &lmmsize);
1227                 if (rc)
1228                         RETURN(rc);
1229
1230                 OBD_ALLOC_LARGE(lmm, lmmsize);
1231                 if (cfs_copy_from_user(lmm, lum, lmmsize))
1232                         GOTO(free_lmm, rc = -EFAULT);
1233
1234                 switch (lmm->lmm_magic) {
1235                 case LOV_USER_MAGIC_V1:
1236                         if (LOV_USER_MAGIC_V1 == cpu_to_le32(LOV_USER_MAGIC_V1))
1237                                 break;
1238                         /* swab objects first so that stripes num will be sane */
1239                         lustre_swab_lov_user_md_objects(
1240                                 ((struct lov_user_md_v1 *)lmm)->lmm_objects,
1241                                 ((struct lov_user_md_v1 *)lmm)->lmm_stripe_count);
1242                         lustre_swab_lov_user_md_v1((struct lov_user_md_v1 *)lmm);
1243                         break;
1244                 case LOV_USER_MAGIC_V3:
1245                         if (LOV_USER_MAGIC_V3 == cpu_to_le32(LOV_USER_MAGIC_V3))
1246                                 break;
1247                         /* swab objects first so that stripes num will be sane */
1248                         lustre_swab_lov_user_md_objects(
1249                                 ((struct lov_user_md_v3 *)lmm)->lmm_objects,
1250                                 ((struct lov_user_md_v3 *)lmm)->lmm_stripe_count);
1251                         lustre_swab_lov_user_md_v3((struct lov_user_md_v3 *)lmm);
1252                         break;
1253                 default:
1254                         GOTO(free_lmm, rc = -EINVAL);
1255                 }
1256
1257                 rc = obd_unpackmd(sbi->ll_dt_exp, &lsm, lmm, lmmsize);
1258                 if (rc < 0)
1259                         GOTO(free_lmm, rc = -ENOMEM);
1260
1261                 /* Perform glimpse_size operation. */
1262                 memset(&st, 0, sizeof(st));
1263
1264                 rc = ll_glimpse_ioctl(sbi, lsm, &st);
1265                 if (rc)
1266                         GOTO(free_lsm, rc);
1267
1268                 if (cfs_copy_to_user(&lumd->lmd_st, &st, sizeof(st)))
1269                         GOTO(free_lsm, rc = -EFAULT);
1270
1271                 EXIT;
1272         free_lsm:
1273                 obd_free_memmd(sbi->ll_dt_exp, &lsm);
1274         free_lmm:
1275                 OBD_FREE_LARGE(lmm, lmmsize);
1276                 return rc;
1277         }
1278         case OBD_IOC_LLOG_CATINFO: {
1279                 RETURN(-EOPNOTSUPP);
1280         }
1281         case OBD_IOC_QUOTACHECK: {
1282                 struct obd_quotactl *oqctl;
1283                 int error = 0;
1284
1285                 if (!cfs_capable(CFS_CAP_SYS_ADMIN) ||
1286                     sbi->ll_flags & LL_SBI_RMT_CLIENT)
1287                         RETURN(-EPERM);
1288
1289                 OBD_ALLOC_PTR(oqctl);
1290                 if (!oqctl)
1291                         RETURN(-ENOMEM);
1292                 oqctl->qc_type = arg;
1293                 rc = obd_quotacheck(sbi->ll_md_exp, oqctl);
1294                 if (rc < 0) {
1295                         CDEBUG(D_INFO, "md_quotacheck failed: rc %d\n", rc);
1296                         error = rc;
1297                 }
1298
1299                 rc = obd_quotacheck(sbi->ll_dt_exp, oqctl);
1300                 if (rc < 0)
1301                         CDEBUG(D_INFO, "obd_quotacheck failed: rc %d\n", rc);
1302
1303                 OBD_FREE_PTR(oqctl);
1304                 return error ?: rc;
1305         }
1306         case OBD_IOC_POLL_QUOTACHECK: {
1307                 struct if_quotacheck *check;
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(check);
1314                 if (!check)
1315                         RETURN(-ENOMEM);
1316
1317                 rc = obd_iocontrol(cmd, sbi->ll_md_exp, 0, (void *)check,
1318                                    NULL);
1319                 if (rc) {
1320                         CDEBUG(D_QUOTA, "mdc ioctl %d failed: %d\n", cmd, rc);
1321                         if (cfs_copy_to_user((void *)arg, check,
1322                                              sizeof(*check)))
1323                                 CDEBUG(D_QUOTA, "cfs_copy_to_user failed\n");
1324                         GOTO(out_poll, rc);
1325                 }
1326
1327                 rc = obd_iocontrol(cmd, sbi->ll_dt_exp, 0, (void *)check,
1328                                    NULL);
1329                 if (rc) {
1330                         CDEBUG(D_QUOTA, "osc ioctl %d failed: %d\n", cmd, rc);
1331                         if (cfs_copy_to_user((void *)arg, check,
1332                                              sizeof(*check)))
1333                                 CDEBUG(D_QUOTA, "cfs_copy_to_user failed\n");
1334                         GOTO(out_poll, rc);
1335                 }
1336         out_poll:
1337                 OBD_FREE_PTR(check);
1338                 RETURN(rc);
1339         }
1340 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2,7,50,0)
1341         case LL_IOC_QUOTACTL_18: {
1342                 /* copy the old 1.x quota struct for internal use, then copy
1343                  * back into old format struct.  For 1.8 compatibility. */
1344                 struct if_quotactl_18 *qctl_18;
1345                 struct if_quotactl *qctl_20;
1346
1347                 OBD_ALLOC_PTR(qctl_18);
1348                 if (!qctl_18)
1349                         RETURN(-ENOMEM);
1350
1351                 OBD_ALLOC_PTR(qctl_20);
1352                 if (!qctl_20)
1353                         GOTO(out_quotactl_18, rc = -ENOMEM);
1354
1355                 if (cfs_copy_from_user(qctl_18, (void *)arg, sizeof(*qctl_18)))
1356                         GOTO(out_quotactl_20, rc = -ENOMEM);
1357
1358                 QCTL_COPY(qctl_20, qctl_18);
1359                 qctl_20->qc_idx = 0;
1360
1361                 /* XXX: dqb_valid was borrowed as a flag to mark that
1362                  *      only mds quota is wanted */
1363                 if (qctl_18->qc_cmd == Q_GETQUOTA &&
1364                     qctl_18->qc_dqblk.dqb_valid) {
1365                         qctl_20->qc_valid = QC_MDTIDX;
1366                         qctl_20->qc_dqblk.dqb_valid = 0;
1367                 } else if (qctl_18->obd_uuid.uuid[0] != '\0') {
1368                         qctl_20->qc_valid = QC_UUID;
1369                         qctl_20->obd_uuid = qctl_18->obd_uuid;
1370                 } else {
1371                         qctl_20->qc_valid = QC_GENERAL;
1372                 }
1373
1374                 rc = quotactl_ioctl(sbi, qctl_20);
1375
1376                 if (rc == 0) {
1377                         QCTL_COPY(qctl_18, qctl_20);
1378                         qctl_18->obd_uuid = qctl_20->obd_uuid;
1379
1380                         if (cfs_copy_to_user((void *)arg, qctl_18,
1381                                              sizeof(*qctl_18)))
1382                                 rc = -EFAULT;
1383                 }
1384
1385         out_quotactl_20:
1386                 OBD_FREE_PTR(qctl_20);
1387         out_quotactl_18:
1388                 OBD_FREE_PTR(qctl_18);
1389                 RETURN(rc);
1390         }
1391 #else
1392 #warning "remove old LL_IOC_QUOTACTL_18 compatibility code"
1393 #endif /* LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2,7,50,0) */
1394         case LL_IOC_QUOTACTL: {
1395                 struct if_quotactl *qctl;
1396
1397                 OBD_ALLOC_PTR(qctl);
1398                 if (!qctl)
1399                         RETURN(-ENOMEM);
1400
1401                 if (cfs_copy_from_user(qctl, (void *)arg, sizeof(*qctl)))
1402                         GOTO(out_quotactl, rc = -EFAULT);
1403
1404                 rc = quotactl_ioctl(sbi, qctl);
1405
1406                 if (rc == 0 && cfs_copy_to_user((void *)arg,qctl,sizeof(*qctl)))
1407                         rc = -EFAULT;
1408
1409         out_quotactl:
1410                 OBD_FREE_PTR(qctl);
1411                 RETURN(rc);
1412         }
1413         case OBD_IOC_GETDTNAME:
1414         case OBD_IOC_GETMDNAME:
1415                 RETURN(ll_get_obd_name(inode, cmd, arg));
1416         case LL_IOC_FLUSHCTX:
1417                 RETURN(ll_flush_ctx(inode));
1418 #ifdef CONFIG_FS_POSIX_ACL
1419         case LL_IOC_RMTACL: {
1420             if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
1421                 inode == inode->i_sb->s_root->d_inode) {
1422                 struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
1423
1424                 LASSERT(fd != NULL);
1425                 rc = rct_add(&sbi->ll_rct, cfs_curproc_pid(), arg);
1426                 if (!rc)
1427                         fd->fd_flags |= LL_FILE_RMTACL;
1428                 RETURN(rc);
1429             } else
1430                 RETURN(0);
1431         }
1432 #endif
1433         case LL_IOC_GETOBDCOUNT: {
1434                 int count, vallen;
1435                 struct obd_export *exp;
1436
1437                 if (cfs_copy_from_user(&count, (int *)arg, sizeof(int)))
1438                         RETURN(-EFAULT);
1439
1440                 /* get ost count when count is zero, get mdt count otherwise */
1441                 exp = count ? sbi->ll_md_exp : sbi->ll_dt_exp;
1442                 vallen = sizeof(count);
1443                 rc = obd_get_info(NULL, exp, sizeof(KEY_TGT_COUNT),
1444                                   KEY_TGT_COUNT, &vallen, &count, NULL);
1445                 if (rc) {
1446                         CERROR("get target count failed: %d\n", rc);
1447                         RETURN(rc);
1448                 }
1449
1450                 if (cfs_copy_to_user((int *)arg, &count, sizeof(int)))
1451                         RETURN(-EFAULT);
1452
1453                 RETURN(0);
1454         }
1455         case LL_IOC_PATH2FID:
1456                 if (cfs_copy_to_user((void *)arg, ll_inode2fid(inode),
1457                                      sizeof(struct lu_fid)))
1458                         RETURN(-EFAULT);
1459                 RETURN(0);
1460         case LL_IOC_GET_CONNECT_FLAGS: {
1461                 RETURN(obd_iocontrol(cmd, sbi->ll_md_exp, 0, NULL, (void*)arg));
1462         }
1463         case OBD_IOC_CHANGELOG_SEND:
1464         case OBD_IOC_CHANGELOG_CLEAR:
1465                 rc = copy_and_ioctl(cmd, sbi->ll_md_exp, (void *)arg,
1466                                     sizeof(struct ioc_changelog));
1467                 RETURN(rc);
1468         case OBD_IOC_FID2PATH:
1469                 RETURN(ll_fid2path(ll_i2mdexp(inode), (void *)arg));
1470         case LL_IOC_HSM_CT_START:
1471                 rc = copy_and_ioctl(cmd, sbi->ll_md_exp, (void *)arg,
1472                                     sizeof(struct lustre_kernelcomm));
1473                 RETURN(rc);
1474
1475         default:
1476                 RETURN(obd_iocontrol(cmd, sbi->ll_dt_exp,0,NULL,(void *)arg));
1477         }
1478 }
1479
1480 static loff_t ll_dir_seek(struct file *file, loff_t offset, int origin)
1481 {
1482         struct inode *inode = file->f_mapping->host;
1483         struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
1484         struct ll_sb_info *sbi = ll_i2sbi(inode);
1485         int api32 = ll_need_32bit_api(sbi);
1486         loff_t ret = -EINVAL;
1487         ENTRY;
1488
1489         cfs_mutex_lock(&inode->i_mutex);
1490         switch (origin) {
1491                 case SEEK_SET:
1492                         break;
1493                 case SEEK_CUR:
1494                         offset += file->f_pos;
1495                         break;
1496                 case SEEK_END:
1497                         if (offset > 0)
1498                                 GOTO(out, ret);
1499                         if (api32)
1500                                 offset += LL_DIR_END_OFF_32BIT;
1501                         else
1502                                 offset += LL_DIR_END_OFF;
1503                         break;
1504                 default:
1505                         GOTO(out, ret);
1506         }
1507
1508         if (offset >= 0 &&
1509             ((api32 && offset <= LL_DIR_END_OFF_32BIT) ||
1510              (!api32 && offset <= LL_DIR_END_OFF))) {
1511                 if (offset != file->f_pos) {
1512                         if ((api32 && offset == LL_DIR_END_OFF_32BIT) ||
1513                             (!api32 && offset == LL_DIR_END_OFF))
1514                                 fd->fd_dir.lfd_pos = MDS_DIR_END_OFF;
1515                         else if (api32 && sbi->ll_flags & LL_SBI_64BIT_HASH)
1516                                 fd->fd_dir.lfd_pos = offset << 32;
1517                         else
1518                                 fd->fd_dir.lfd_pos = offset;
1519                         file->f_pos = offset;
1520                         file->f_version = 0;
1521                 }
1522                 ret = offset;
1523         }
1524         GOTO(out, ret);
1525
1526 out:
1527         cfs_mutex_unlock(&inode->i_mutex);
1528         return ret;
1529 }
1530
1531 int ll_dir_open(struct inode *inode, struct file *file)
1532 {
1533         ENTRY;
1534         RETURN(ll_file_open(inode, file));
1535 }
1536
1537 int ll_dir_release(struct inode *inode, struct file *file)
1538 {
1539         ENTRY;
1540         RETURN(ll_file_release(inode, file));
1541 }
1542
1543 struct file_operations ll_dir_operations = {
1544         .llseek   = ll_dir_seek,
1545         .open     = ll_dir_open,
1546         .release  = ll_dir_release,
1547         .read     = generic_read_dir,
1548         .readdir  = ll_readdir,
1549         .unlocked_ioctl   = ll_dir_ioctl,
1550         .fsync    = ll_fsync,
1551 };