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