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