lustre/llite/dir.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/dir.c
  12  *  linux/fs/ext2/dir.c
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  *
  16  *  ext2 directory handling functions
  17  *
  18  *  Big-endian to little-endian byte-swapping/bitmaps by
  19  *        David S. Miller (davem@caip.rutgers.edu), 1995
  20  *
  21  *  All code that works with directory layout had been switched to pagecache
  22  *  and moved here. AV
  23  *
  24  *  Adapted for Lustre Light
  25  *  Copyright (C) 2002-2003, Cluster File Systems, Inc.
  26  *
  27  */
  28
  29 #include <linux/fs.h>
  30 #include <linux/ext2_fs.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/mm.h>
  33 #include <linux/version.h>
  34 #include <linux/smp_lock.h>
  35 #include <asm/uaccess.h>
  36 #include <linux/buffer_head.h>   // for wait_on_buffer
  37
  38 #define DEBUG_SUBSYSTEM S_LLITE
  39
  40 #include <obd_support.h>
  41 #include <obd_class.h>
  42 #include <lustre_lib.h>
  43 #include <lustre/lustre_idl.h>
  44 #include <lustre_lite.h>
  45 #include <lustre_dlm.h>
  46 #include <lustre_fid.h>
  47 #include "llite_internal.h"
  48
  49 #ifndef HAVE_PAGE_CHECKED
  50 #ifdef HAVE_PG_FS_MISC
  51 #define PageChecked(page)        test_bit(PG_fs_misc, &(page)->flags)
  52 #define SetPageChecked(page)     set_bit(PG_fs_misc, &(page)->flags)
  53 #else
  54 #error PageChecked or PageFsMisc not defined in kernel
  55 #endif
  56 #endif
  57
  58 /*
  59  * (new) readdir implementation overview.
  60  *
  61  * Original lustre readdir implementation cached exact copy of raw directory
  62  * pages on the client. These pages were indexed in client page cache by
  63  * logical offset in the directory file. This design, while very simple and
  64  * intuitive had some inherent problems:
  65  *
  66  *     . it implies that byte offset to the directory entry serves as a
  67  *     telldir(3)/seekdir(3) cookie, but that offset is not stable: in
  68  *     ext3/htree directory entries may move due to splits, and more
  69  *     importantly,
  70  *
  71  *     . it is incompatible with the design of split directories for cmd3,
  72  *     that assumes that names are distributed across nodes based on their
  73  *     hash, and so readdir should be done in hash order.
  74  *
  75  * New readdir implementation does readdir in hash order, and uses hash of a
  76  * file name as a telldir/seekdir cookie. This led to number of complications:
  77  *
  78  *     . hash is not unique, so it cannot be used to index cached directory
  79  *     pages on the client (note, that it requires a whole pageful of hash
  80  *     collided entries to cause two pages to have identical hashes);
  81  *
  82  *     . hash is not unique, so it cannot, strictly speaking, be used as an
  83  *     entry cookie. ext3/htree has the same problem and lustre implementation
  84  *     mimics their solution: seekdir(hash) positions directory at the first
  85  *     entry with the given hash.
  86  *
  87  * Client side.
  88  *
  89  * 0. caching
  90  *
  91  * Client caches directory pages using hash of the first entry as an index. As
  92  * noted above hash is not unique, so this solution doesn't work as is:
  93  * special processing is needed for "page hash chains" (i.e., sequences of
  94  * pages filled with entries all having the same hash value).
  95  *
  96  * First, such chains have to be detected. To this end, server returns to the
  97  * client the hash of the first entry on the page next to one returned. When
  98  * client detects that this hash is the same as hash of the first entry on the
  99  * returned page, page hash collision has to be handled. Pages in the
 100  * hash chain, except first one, are termed "overflow pages".
 101  *
 102  * Solution to index uniqueness problem is to not cache overflow
 103  * pages. Instead, when page hash collision is detected, all overflow pages
 104  * from emerging chain are immediately requested from the server and placed in
 105  * a special data structure (struct ll_dir_chain). This data structure is used
 106  * by ll_readdir() to process entries from overflow pages. When readdir
 107  * invocation finishes, overflow pages are discarded. If page hash collision
 108  * chain weren't completely processed, next call to readdir will again detect
 109  * page hash collision, again read overflow pages in, process next portion of
 110  * entries and again discard the pages. This is not as wasteful as it looks,
 111  * because, given reasonable hash, page hash collisions are extremely rare.
 112  *
 113  * 1. directory positioning
 114  *
 115  * When seekdir(hash) is called, original
 116  *
 117  *
 118  *
 119  *
 120  *
 121  *
 122  *
 123  *
 124  * Server.
 125  *
 126  * identification of and access to overflow pages
 127  *
 128  * page format
 129  *
 130  *
 131  *
 132  *
 133  *
 134  */
 135
 136 /* returns the page unlocked, but with a reference */
 137 static int ll_dir_readpage(struct file *file, struct page *page)
 138 {
 139         struct inode *inode = page->mapping->host;
 140         struct ptlrpc_request *request;
 141         struct mdt_body *body;
 142         struct obd_capa *oc;
 143         __u64 hash;
 144         int rc;
 145         ENTRY;
 146
 147         hash = hash_x_index(page->index);
 148         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) off %lu\n",
 149                inode->i_ino, inode->i_generation, inode, (unsigned long)hash);
 150
 151         oc = ll_mdscapa_get(inode);
 152         rc = md_readpage(ll_i2sbi(inode)->ll_md_exp, ll_inode2fid(inode),
 153                          oc, hash, page, &request);
 154         capa_put(oc);
 155         if (!rc) {
 156                 body = req_capsule_server_get(&request->rq_pill, &RMF_MDT_BODY);
 157                 /* Checked by mdc_readpage() */
 158                 LASSERT(body != NULL);
 159
 160                 if (body->valid & OBD_MD_FLSIZE) {
 161                         ll_inode_size_lock(inode, 0);
 162                         i_size_write(inode, body->size);
 163                         ll_inode_size_unlock(inode, 0);
 164                 }
 165                 SetPageUptodate(page);
 166         }
 167         ptlrpc_req_finished(request);
 168
 169         unlock_page(page);
 170         EXIT;
 171         return rc;
 172 }
 173
 174 struct address_space_operations ll_dir_aops = {
 175         .readpage  = ll_dir_readpage,
 176 };
 177
 178 static inline unsigned long dir_pages(struct inode *inode)
 179 {
 180         return (i_size_read(inode) + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
 181 }
 182
 183 static inline unsigned ll_chunk_size(struct inode *inode)
 184 {
 185         return inode->i_sb->s_blocksize;
 186 }
 187
 188 static void ll_check_page(struct inode *dir, struct page *page)
 189 {
 190         /* XXX: check page format later */
 191         SetPageChecked(page);
 192 }
 193
 194 static inline void ll_put_page(struct page *page)
 195 {
 196         kunmap(page);
 197         page_cache_release(page);
 198 }
 199
 200 /*
 201  * Find, kmap and return page that contains given hash.
 202  */
 203 static struct page *ll_dir_page_locate(struct inode *dir, unsigned long hash,
 204                                        __u64 *start, __u64 *end)
 205 {
 206         struct address_space *mapping = dir->i_mapping;
 207         /*
 208          * Complement of hash is used as an index so that
 209          * radix_tree_gang_lookup() can be used to find a page with starting
 210          * hash _smaller_ than one we are looking for.
 211          */
 212         unsigned long offset = hash_x_index(hash);
 213         struct page *page;
 214         int found;
 215
 216         TREE_READ_LOCK_IRQ(mapping);
 217         found = radix_tree_gang_lookup(&mapping->page_tree,
 218                                        (void **)&page, offset, 1);
 219         if (found > 0) {
 220                 struct lu_dirpage *dp;
 221
 222                 page_cache_get(page);
 223                 TREE_READ_UNLOCK_IRQ(mapping);
 224                 /*
 225                  * In contrast to find_lock_page() we are sure that directory
 226                  * page cannot be truncated (while DLM lock is held) and,
 227                  * hence, can avoid restart.
 228                  *
 229                  * In fact, page cannot be locked here at all, because
 230                  * ll_dir_readpage() does synchronous io.
 231                  */
 232                 wait_on_page(page);
 233                 if (PageUptodate(page)) {
 234                         dp = kmap(page);
 235                         *start = le64_to_cpu(dp->ldp_hash_start);
 236                         *end   = le64_to_cpu(dp->ldp_hash_end);
 237                         LASSERT(*start <= hash);
 238                         if (hash > *end || (*end != *start && hash == *end)) {
 239                                 kunmap(page);
 240                                 lock_page(page);
 241                                 ll_truncate_complete_page(page);
 242                                 unlock_page(page);
 243                                 page_cache_release(page);
 244                                 page = NULL;
 245                         }
 246                 } else {
 247                         page_cache_release(page);
 248                         page = ERR_PTR(-EIO);
 249                 }
 250
 251         } else {
 252                 TREE_READ_UNLOCK_IRQ(mapping);
 253                 page = NULL;
 254         }
 255         return page;
 256 }
 257
 258 static struct page *ll_get_dir_page(struct inode *dir, __u32 hash, int exact,
 259                                     struct ll_dir_chain *chain)
 260 {
 261         ldlm_policy_data_t policy = {.l_inodebits = {MDS_INODELOCK_UPDATE} };
 262         struct address_space *mapping = dir->i_mapping;
 263         struct lustre_handle lockh;
 264         struct lu_dirpage *dp;
 265         struct page *page;
 266         ldlm_mode_t mode;
 267         int rc;
 268         __u64 start;
 269         __u64 end;
 270
 271         mode = LCK_PR;
 272         rc = md_lock_match(ll_i2sbi(dir)->ll_md_exp, LDLM_FL_BLOCK_GRANTED,
 273                            ll_inode2fid(dir), LDLM_IBITS, &policy, mode, &lockh);
 274         if (!rc) {
 275                 struct ldlm_enqueue_info einfo = { LDLM_IBITS, mode,
 276                        ll_md_blocking_ast, ldlm_completion_ast, NULL, dir };
 277                 struct lookup_intent it = { .it_op = IT_READDIR };
 278                 struct ptlrpc_request *request;
 279                 struct md_op_data *op_data;
 280
 281                 op_data = ll_prep_md_op_data(NULL, dir, NULL, NULL, 0, 0,
 282                                              LUSTRE_OPC_ANY, NULL);
 283                 if (IS_ERR(op_data))
 284                         return (void *)op_data;
 285
 286                 rc = md_enqueue(ll_i2sbi(dir)->ll_md_exp, &einfo, &it,
 287                                 op_data, &lockh, NULL, 0, 0);
 288
 289                 ll_finish_md_op_data(op_data);
 290
 291                 request = (struct ptlrpc_request *)it.d.lustre.it_data;
 292                 if (request)
 293                         ptlrpc_req_finished(request);
 294                 if (rc < 0) {
 295                         CERROR("lock enqueue: rc: %d\n", rc);
 296                         return ERR_PTR(rc);
 297                 }
 298         } else {
 299                 /* for cross-ref object, l_ast_data of the lock may not be set,
 300                  * we reset it here */
 301                 md_set_lock_data(ll_i2sbi(dir)->ll_md_exp, &lockh.cookie, dir);
 302         }
 303         ldlm_lock_dump_handle(D_OTHER, &lockh);
 304
 305         page = ll_dir_page_locate(dir, hash, &start, &end);
 306         if (IS_ERR(page))
 307                 GOTO(out_unlock, page);
 308
 309         if (page != NULL) {
 310                 /*
 311                  * XXX nikita: not entirely correct handling of a corner case:
 312                  * suppose hash chain of entries with hash value HASH crosses
 313                  * border between pages P0 and P1. First both P0 and P1 are
 314                  * cached, seekdir() is called for some entry from the P0 part
 315                  * of the chain. Later P0 goes out of cache. telldir(HASH)
 316                  * happens and finds P1, as it starts with matching hash
 317                  * value. Remaining entries from P0 part of the chain are
 318                  * skipped. (Is that really a bug?)
 319                  *
 320                  * Possible solutions: 0. don't cache P1 is such case, handle
 321                  * it as an "overflow" page. 1. invalidate all pages at
 322                  * once. 2. use HASH|1 as an index for P1.
 323                  */
 324                 if (exact && hash != start) {
 325                         /*
 326                          * readdir asked for a page starting _exactly_ from
 327                          * given hash, but cache contains stale page, with
 328                          * entries with smaller hash values. Stale page should
 329                          * be invalidated, and new one fetched.
 330                          */
 331                         CWARN("Stale readpage page %p: %#lx != %#lx\n", page,
 332                               (unsigned long)hash, (unsigned long)start);
 333                         lock_page(page);
 334                         ll_truncate_complete_page(page);
 335                         unlock_page(page);
 336                         page_cache_release(page);
 337                 } else
 338                         GOTO(hash_collision, page);
 339         }
 340
 341         page = read_cache_page(mapping, hash_x_index(hash),
 342                                (filler_t*)mapping->a_ops->readpage, NULL);
 343         if (IS_ERR(page))
 344                 GOTO(out_unlock, page);
 345
 346         wait_on_page(page);
 347         (void)kmap(page);
 348         if (!PageUptodate(page))
 349                 goto fail;
 350         if (!PageChecked(page))
 351                 ll_check_page(dir, page);
 352         if (PageError(page))
 353                 goto fail;
 354 hash_collision:
 355         dp = page_address(page);
 356
 357         start = le64_to_cpu(dp->ldp_hash_start);
 358         end   = le64_to_cpu(dp->ldp_hash_end);
 359         if (end == start) {
 360                 LASSERT(start == hash);
 361                 CWARN("Page-wide hash collision: %#lx\n", (unsigned long)end);
 362                 /*
 363                  * Fetch whole overflow chain...
 364                  *
 365                  * XXX not yet.
 366                  */
 367                 goto fail;
 368         }
 369 out_unlock:
 370         ldlm_lock_decref(&lockh, mode);
 371         return page;
 372
 373 fail:
 374         ll_put_page(page);
 375         page = ERR_PTR(-EIO);
 376         goto out_unlock;
 377 }
 378
 379 int ll_readdir(struct file *filp, void *cookie, filldir_t filldir)
 380 {
 381         struct inode         *inode = filp->f_dentry->d_inode;
 382         struct ll_inode_info *info  = ll_i2info(inode);
 383         struct ll_sb_info    *sbi   = ll_i2sbi(inode);
 384         __u64                 pos   = filp->f_pos;
 385         struct page          *page;
 386         struct ll_dir_chain   chain;
 387         int rc;
 388         int done;
 389         int shift;
 390         ENTRY;
 391
 392         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) pos %lu/%llu\n",
 393                inode->i_ino, inode->i_generation, inode,
 394                (unsigned long)pos, i_size_read(inode));
 395
 396         if (pos == DIR_END_OFF)
 397                 /*
 398                  * end-of-file.
 399                  */
 400                 RETURN(0);
 401
 402         rc    = 0;
 403         done  = 0;
 404         shift = 0;
 405         ll_dir_chain_init(&chain);
 406
 407         page = ll_get_dir_page(inode, pos, 0, &chain);
 408
 409         while (rc == 0 && !done) {
 410                 struct lu_dirpage *dp;
 411                 struct lu_dirent  *ent;
 412
 413                 if (!IS_ERR(page)) {
 414                         /*
 415                          * If page is empty (end of directoryis reached),
 416                          * use this value.
 417                          */
 418                         __u64 hash = DIR_END_OFF;
 419                         __u64 next;
 420
 421                         dp = page_address(page);
 422                         for (ent = lu_dirent_start(dp); ent != NULL && !done;
 423                              ent = lu_dirent_next(ent)) {
 424                                 char          *name;
 425                                 int            namelen;
 426                                 struct lu_fid  fid;
 427                                 ino_t          ino;
 428
 429                                 /*
 430                                  * XXX: implement correct swabbing here.
 431                                  */
 432
 433                                 hash    = le64_to_cpu(ent->lde_hash);
 434                                 namelen = le16_to_cpu(ent->lde_namelen);
 435
 436                                 if (hash < pos)
 437                                         /*
 438                                          * Skip until we find target hash
 439                                          * value.
 440                                          */
 441                                         continue;
 442
 443                                 if (namelen == 0)
 444                                         /*
 445                                          * Skip dummy record.
 446                                          */
 447                                         continue;
 448
 449                                 fid  = ent->lde_fid;
 450                                 name = ent->lde_name;
 451                                 fid_le_to_cpu(&fid, &fid);
 452                                 ino  = ll_fid_build_ino(sbi, &fid);
 453
 454                                 done = filldir(cookie, name, namelen,
 455                                                (loff_t)hash, ino, DT_UNKNOWN);
 456                         }
 457                         next = le64_to_cpu(dp->ldp_hash_end);
 458                         ll_put_page(page);
 459                         if (!done) {
 460                                 pos = next;
 461                                 if (pos == DIR_END_OFF)
 462                                         /*
 463                                          * End of directory reached.
 464                                          */
 465                                         done = 1;
 466                                 else if (1 /* chain is exhausted*/)
 467                                         /*
 468                                          * Normal case: continue to the next
 469                                          * page.
 470                                          */
 471                                         page = ll_get_dir_page(inode, pos, 1,
 472                                                                &chain);
 473                                 else {
 474                                         /*
 475                                          * go into overflow page.
 476                                          */
 477                                 }
 478                         } else
 479                                 pos = hash;
 480                 } else {
 481                         rc = PTR_ERR(page);
 482                         CERROR("error reading dir "DFID" at %lu: rc %d\n",
 483                                PFID(&info->lli_fid), (unsigned long)pos, rc);
 484                 }
 485         }
 486
 487         filp->f_pos = (loff_t)(__s32)pos;
 488         filp->f_version = inode->i_version;
 489         touch_atime(filp->f_vfsmnt, filp->f_dentry);
 490
 491         ll_dir_chain_fini(&chain);
 492
 493         RETURN(rc);
 494 }
 495
 496 #define QCTL_COPY(out, in)              \
 497 do {                                    \
 498         Q_COPY(out, in, qc_cmd);        \
 499         Q_COPY(out, in, qc_type);       \
 500         Q_COPY(out, in, qc_id);         \
 501         Q_COPY(out, in, qc_stat);       \
 502         Q_COPY(out, in, qc_dqinfo);     \
 503         Q_COPY(out, in, qc_dqblk);      \
 504 } while (0)
 505
 506 int ll_send_mgc_param(struct obd_export *mgc, char *string)
 507 {
 508         struct mgs_send_param *msp;
 509         int rc = 0;
 510
 511         OBD_ALLOC_PTR(msp);
 512         if (!msp)
 513                 return -ENOMEM;
 514
 515         strncpy(msp->mgs_param, string, MGS_PARAM_MAXLEN);
 516         rc = obd_set_info_async(mgc, strlen(KEY_SET_INFO), KEY_SET_INFO,
 517                                 sizeof(struct mgs_send_param), msp, NULL);
 518         if (rc)
 519                 CERROR("Failed to set parameter: %d\n", rc);
 520         OBD_FREE_PTR(msp);
 521
 522         return rc;
 523 }
 524
 525 char *ll_get_fsname(struct inode *inode)
 526 {
 527         struct lustre_sb_info *lsi = s2lsi(inode->i_sb);
 528         char *ptr, *fsname;
 529         int len;
 530
 531         OBD_ALLOC(fsname, MGS_PARAM_MAXLEN);
 532         len = strlen(lsi->lsi_lmd->lmd_profile);
 533         ptr = strrchr(lsi->lsi_lmd->lmd_profile, '-');
 534         if (ptr && (strcmp(ptr, "-client") == 0))
 535                 len -= 7;
 536         strncpy(fsname, lsi->lsi_lmd->lmd_profile, len);
 537         fsname[len] = '\0';
 538
 539         return fsname;
 540 }
 541
 542 int ll_dir_setstripe(struct inode *inode, struct lov_user_md *lump,
 543                      int set_default)
 544 {
 545         struct ll_sb_info *sbi = ll_i2sbi(inode);
 546         struct md_op_data *op_data;
 547         struct ptlrpc_request *req = NULL;
 548         int rc = 0;
 549         struct lustre_sb_info *lsi = s2lsi(inode->i_sb);
 550         struct obd_device *mgc = lsi->lsi_mgc;
 551         char *fsname = NULL, *param = NULL;
 552
 553         /*
 554          * This is coming from userspace, so should be in
 555          * local endian.  But the MDS would like it in little
 556          * endian, so we swab it before we send it.
 557          */
 558         if (lump->lmm_magic != LOV_USER_MAGIC)
 559                 RETURN(-EINVAL);
 560
 561         if (lump->lmm_magic != cpu_to_le32(LOV_USER_MAGIC))
 562                 lustre_swab_lov_user_md(lump);
 563
 564         op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
 565                                      LUSTRE_OPC_ANY, NULL);
 566         if (IS_ERR(op_data))
 567                 RETURN(PTR_ERR(op_data));
 568
 569         /* swabbing is done in lov_setstripe() on server side */
 570         rc = md_setattr(sbi->ll_md_exp, op_data, lump, sizeof(*lump),
 571                         NULL, 0, &req, NULL);
 572         ll_finish_md_op_data(op_data);
 573         ptlrpc_req_finished(req);
 574         if (rc) {
 575                 if (rc != -EPERM && rc != -EACCES)
 576                         CERROR("mdc_setattr fails: rc = %d\n", rc);
 577         }
 578
 579         if (set_default && mgc->u.cli.cl_mgc_mgsexp) {
 580                 OBD_ALLOC(param, MGS_PARAM_MAXLEN);
 581
 582                 /* Get fsname and assume devname to be -MDT0000. */
 583                 fsname = ll_get_fsname(inode);
 584                 /* Set root stripesize */
 585                 sprintf(param, "%s-MDT0000.lov.stripesize=%u", fsname,
 586                         lump->lmm_stripe_size);
 587                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 588                 if (rc)
 589                         goto end;
 590
 591                 /* Set root stripecount */
 592                 sprintf(param, "%s-MDT0000.lov.stripecount=%u", fsname,
 593                         lump->lmm_stripe_count);
 594                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 595                 if (rc)
 596                         goto end;
 597
 598                 /* Set root stripeoffset */
 599                 sprintf(param, "%s-MDT0000.lov.stripeoffset=%u", fsname,
 600                         lump->lmm_stripe_offset);
 601                 rc = ll_send_mgc_param(mgc->u.cli.cl_mgc_mgsexp, param);
 602                 if (rc)
 603                         goto end;
 604 end:
 605                 if (fsname)
 606                         OBD_FREE(fsname, MGS_PARAM_MAXLEN);
 607                 if (param)
 608                         OBD_FREE(param, MGS_PARAM_MAXLEN);
 609         }
 610         return rc;
 611 }
 612
 613 int ll_dir_getstripe(struct inode *inode, struct lov_mds_md **lmmp,
 614                      int *lmm_size, struct ptlrpc_request **request)
 615 {
 616         struct ll_sb_info *sbi = ll_i2sbi(inode);
 617         struct mdt_body   *body;
 618         struct lov_mds_md *lmm = NULL;
 619         struct ptlrpc_request *req = NULL;
 620         int rc, lmmsize;
 621         struct obd_capa *oc;
 622
 623         rc = ll_get_max_mdsize(sbi, &lmmsize);
 624         if (rc)
 625                 RETURN(rc);
 626
 627         oc = ll_mdscapa_get(inode);
 628         rc = md_getattr(sbi->ll_md_exp, ll_inode2fid(inode),
 629                         oc, OBD_MD_FLEASIZE | OBD_MD_FLDIREA,
 630                         lmmsize, &req);
 631         capa_put(oc);
 632         if (rc < 0) {
 633                 CDEBUG(D_INFO, "md_getattr failed on inode "
 634                        "%lu/%u: rc %d\n", inode->i_ino,
 635                        inode->i_generation, rc);
 636                 GOTO(out, rc);
 637         }
 638
 639         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
 640         LASSERT(body != NULL);
 641
 642         lmmsize = body->eadatasize;
 643
 644         if (!(body->valid & (OBD_MD_FLEASIZE | OBD_MD_FLDIREA)) ||
 645             lmmsize == 0) {
 646                 GOTO(out, rc = -ENODATA);
 647         }
 648
 649         lmm = req_capsule_server_sized_get(&req->rq_pill,
 650                                            &RMF_MDT_MD, lmmsize);
 651         LASSERT(lmm != NULL);
 652
 653         /*
 654          * This is coming from the MDS, so is probably in
 655          * little endian.  We convert it to host endian before
 656          * passing it to userspace.
 657          */
 658         if (lmm->lmm_magic == __swab32(LOV_MAGIC)) {
 659                 lustre_swab_lov_user_md((struct lov_user_md *)lmm);
 660                 lustre_swab_lov_user_md_objects((struct lov_user_md *)lmm);
 661         }
 662 out:
 663         *lmmp = lmm;
 664         *lmm_size = lmmsize;
 665         *request = req;
 666         return rc;
 667 }
 668
 669 static int ll_dir_ioctl(struct inode *inode, struct file *file,
 670                         unsigned int cmd, unsigned long arg)
 671 {
 672         struct ll_sb_info *sbi = ll_i2sbi(inode);
 673         struct obd_ioctl_data *data;
 674         ENTRY;
 675
 676         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), cmd=%#x\n",
 677                inode->i_ino, inode->i_generation, inode, cmd);
 678
 679         /* asm-ppc{,64} declares TCGETS, et. al. as type 't' not 'T' */
 680         if (_IOC_TYPE(cmd) == 'T' || _IOC_TYPE(cmd) == 't') /* tty ioctls */
 681                 return -ENOTTY;
 682
 683         ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_IOCTL, 1);
 684         switch(cmd) {
 685         case EXT3_IOC_GETFLAGS:
 686         case EXT3_IOC_SETFLAGS:
 687                 RETURN(ll_iocontrol(inode, file, cmd, arg));
 688         case EXT3_IOC_GETVERSION_OLD:
 689         case EXT3_IOC_GETVERSION:
 690                 RETURN(put_user(inode->i_generation, (int *)arg));
 691         /* We need to special case any other ioctls we want to handle,
 692          * to send them to the MDS/OST as appropriate and to properly
 693          * network encode the arg field.
 694         case EXT3_IOC_SETVERSION_OLD:
 695         case EXT3_IOC_SETVERSION:
 696         */
 697         case IOC_MDC_LOOKUP: {
 698                 struct ptlrpc_request *request = NULL;
 699                 int namelen, rc, len = 0;
 700                 char *buf = NULL;
 701                 char *filename;
 702                 struct obd_capa *oc;
 703
 704                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 705                 if (rc)
 706                         RETURN(rc);
 707                 data = (void *)buf;
 708
 709                 filename = data->ioc_inlbuf1;
 710                 namelen = data->ioc_inllen1;
 711
 712                 if (namelen < 1) {
 713                         CDEBUG(D_INFO, "IOC_MDC_LOOKUP missing filename\n");
 714                         GOTO(out, rc = -EINVAL);
 715                 }
 716
 717                 oc = ll_mdscapa_get(inode);
 718                 rc = md_getattr_name(sbi->ll_md_exp, ll_inode2fid(inode), oc,
 719                                      filename, namelen, OBD_MD_FLID, 0,
 720                                      ll_i2suppgid(inode), &request);
 721                 capa_put(oc);
 722                 if (rc < 0) {
 723                         CDEBUG(D_INFO, "md_getattr_name: %d\n", rc);
 724                         GOTO(out, rc);
 725                 }
 726
 727                 ptlrpc_req_finished(request);
 728
 729                 EXIT;
 730         out:
 731                 obd_ioctl_freedata(buf, len);
 732                 return rc;
 733         }
 734         case LL_IOC_LOV_SETSTRIPE: {
 735                 struct lov_user_md lum, *lump = (struct lov_user_md *)arg;
 736                 int rc = 0;
 737                 int set_default = 0;
 738
 739                 LASSERT(sizeof(lum) == sizeof(*lump));
 740                 LASSERT(sizeof(lum.lmm_objects[0]) ==
 741                         sizeof(lump->lmm_objects[0]));
 742                 rc = copy_from_user(&lum, lump, sizeof(lum));
 743                 if (rc)
 744                         RETURN(-EFAULT);
 745
 746                 if (inode->i_sb->s_root == file->f_dentry)
 747                         set_default = 1;
 748
 749                 rc = ll_dir_setstripe(inode, &lum, set_default);
 750
 751                 RETURN(rc);
 752         }
 753         case LL_IOC_OBD_STATFS:
 754                 RETURN(ll_obd_statfs(inode, (void *)arg));
 755         case LL_IOC_LOV_GETSTRIPE:
 756         case LL_IOC_MDC_GETINFO:
 757         case IOC_MDC_GETFILEINFO:
 758         case IOC_MDC_GETFILESTRIPE: {
 759                 struct ptlrpc_request *request = NULL;
 760                 struct lov_user_md *lump;
 761                 struct lov_mds_md *lmm = NULL;
 762                 struct mdt_body *body;
 763                 char *filename = NULL;
 764                 int rc, lmmsize;
 765
 766                 if (cmd == IOC_MDC_GETFILEINFO ||
 767                     cmd == IOC_MDC_GETFILESTRIPE) {
 768                         filename = getname((const char *)arg);
 769                         if (IS_ERR(filename))
 770                                 RETURN(PTR_ERR(filename));
 771
 772                         rc = ll_lov_getstripe_ea_info(inode, filename, &lmm,
 773                                                       &lmmsize, &request);
 774                 } else {
 775                         rc = ll_dir_getstripe(inode, &lmm, &lmmsize, &request);
 776                 }
 777
 778                 if (request) {
 779                         body = req_capsule_server_get(&request->rq_pill,
 780                                                       &RMF_MDT_BODY);
 781                         LASSERT(body != NULL);
 782                 } else {
 783                         GOTO(out_req, rc);
 784                 }
 785
 786                 if (rc < 0) {
 787                         if (rc == -ENODATA && (cmd == IOC_MDC_GETFILEINFO ||
 788                                                cmd == LL_IOC_MDC_GETINFO))
 789                                 GOTO(skip_lmm, rc = 0);
 790                         else
 791                                 GOTO(out_req, rc);
 792                 }
 793
 794                 if (cmd == IOC_MDC_GETFILESTRIPE ||
 795                     cmd == LL_IOC_LOV_GETSTRIPE) {
 796                         lump = (struct lov_user_md *)arg;
 797                 } else {
 798                         struct lov_user_mds_data *lmdp;
 799                         lmdp = (struct lov_user_mds_data *)arg;
 800                         lump = &lmdp->lmd_lmm;
 801                 }
 802                 rc = copy_to_user(lump, lmm, lmmsize);
 803                 if (rc)
 804                         GOTO(out_lmm, rc = -EFAULT);
 805         skip_lmm:
 806                 if (cmd == IOC_MDC_GETFILEINFO || cmd == LL_IOC_MDC_GETINFO) {
 807                         struct lov_user_mds_data *lmdp;
 808                         lstat_t st = { 0 };
 809
 810                         st.st_dev     = inode->i_sb->s_dev;
 811                         st.st_mode    = body->mode;
 812                         st.st_nlink   = body->nlink;
 813                         st.st_uid     = body->uid;
 814                         st.st_gid     = body->gid;
 815                         st.st_rdev    = body->rdev;
 816                         st.st_size    = body->size;
 817                         st.st_blksize = CFS_PAGE_SIZE;
 818                         st.st_blocks  = body->blocks;
 819                         st.st_atime   = body->atime;
 820                         st.st_mtime   = body->mtime;
 821                         st.st_ctime   = body->ctime;
 822                         st.st_ino     = inode->i_ino;
 823
 824                         lmdp = (struct lov_user_mds_data *)arg;
 825                         rc = copy_to_user(&lmdp->lmd_st, &st, sizeof(st));
 826                         if (rc)
 827                                 GOTO(out_lmm, rc = -EFAULT);
 828                 }
 829
 830                 EXIT;
 831         out_lmm:
 832                 if (lmm && lmm->lmm_magic == LOV_MAGIC_JOIN)
 833                         OBD_FREE(lmm, lmmsize);
 834         out_req:
 835                 ptlrpc_req_finished(request);
 836                 if (filename)
 837                         putname(filename);
 838                 return rc;
 839         }
 840         case IOC_LOV_GETINFO: {
 841                 struct lov_user_mds_data *lumd;
 842                 struct lov_stripe_md *lsm;
 843                 struct lov_user_md *lum;
 844                 struct lov_mds_md *lmm;
 845                 int lmmsize;
 846                 lstat_t st;
 847                 int rc;
 848
 849                 lumd = (struct lov_user_mds_data *)arg;
 850                 lum = &lumd->lmd_lmm;
 851
 852                 rc = ll_get_max_mdsize(sbi, &lmmsize);
 853                 if (rc)
 854                         RETURN(rc);
 855
 856                 OBD_ALLOC(lmm, lmmsize);
 857                 rc = copy_from_user(lmm, lum, lmmsize);
 858                 if (rc)
 859                         GOTO(free_lmm, rc = -EFAULT);
 860
 861                 rc = obd_unpackmd(sbi->ll_dt_exp, &lsm, lmm, lmmsize);
 862                 if (rc < 0)
 863                         GOTO(free_lmm, rc = -ENOMEM);
 864
 865                 rc = obd_checkmd(sbi->ll_dt_exp, sbi->ll_md_exp, lsm);
 866                 if (rc)
 867                         GOTO(free_lsm, rc);
 868
 869                 /* Perform glimpse_size operation. */
 870                 memset(&st, 0, sizeof(st));
 871
 872                 rc = ll_glimpse_ioctl(sbi, lsm, &st);
 873                 if (rc)
 874                         GOTO(free_lsm, rc);
 875
 876                 rc = copy_to_user(&lumd->lmd_st, &st, sizeof(st));
 877                 if (rc)
 878                         GOTO(free_lsm, rc = -EFAULT);
 879
 880                 EXIT;
 881         free_lsm:
 882                 obd_free_memmd(sbi->ll_dt_exp, &lsm);
 883         free_lmm:
 884                 OBD_FREE(lmm, lmmsize);
 885                 return rc;
 886         }
 887         case OBD_IOC_LLOG_CATINFO: {
 888                 struct ptlrpc_request *req = NULL;
 889                 char                  *buf = NULL;
 890                 char                  *str;
 891                 int                    len = 0;
 892                 int                    rc;
 893
 894                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 895                 if (rc)
 896                         RETURN(rc);
 897                 data = (void *)buf;
 898
 899                 if (!data->ioc_inlbuf1) {
 900                         obd_ioctl_freedata(buf, len);
 901                         RETURN(-EINVAL);
 902                 }
 903
 904                 req = ptlrpc_request_alloc(sbi2mdc(sbi)->cl_import,
 905                                            &RQF_LLOG_CATINFO);
 906                 if (req == NULL)
 907                         GOTO(out_catinfo, rc = -ENOMEM);
 908
 909                 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
 910                                      data->ioc_inllen1);
 911                 req_capsule_set_size(&req->rq_pill, &RMF_STRING, RCL_CLIENT,
 912                                      data->ioc_inllen2);
 913
 914                 rc = ptlrpc_request_pack(req, LUSTRE_LOG_VERSION, LLOG_CATINFO);
 915                 if (rc) {
 916                         ptlrpc_request_free(req);
 917                         GOTO(out_catinfo, rc);
 918                 }
 919
 920                 str = req_capsule_client_get(&req->rq_pill, &RMF_NAME);
 921                 memcpy(str, data->ioc_inlbuf1, data->ioc_inllen1);
 922                 if (data->ioc_inllen2) {
 923                         str = req_capsule_client_get(&req->rq_pill,
 924                                                      &RMF_STRING);
 925                         memcpy(str, data->ioc_inlbuf2, data->ioc_inllen2);
 926                 }
 927
 928                 req_capsule_set_size(&req->rq_pill, &RMF_STRING, RCL_SERVER,
 929                                      data->ioc_plen1);
 930                 ptlrpc_request_set_replen(req);
 931
 932                 rc = ptlrpc_queue_wait(req);
 933                 if (!rc) {
 934                         str = req_capsule_server_get(&req->rq_pill,
 935                                                      &RMF_STRING);
 936                         rc = copy_to_user(data->ioc_pbuf1, str, data->ioc_plen1);
 937                 }
 938                 ptlrpc_req_finished(req);
 939         out_catinfo:
 940                 obd_ioctl_freedata(buf, len);
 941                 RETURN(rc);
 942         }
 943         case OBD_IOC_QUOTACHECK: {
 944                 struct obd_quotactl *oqctl;
 945                 int rc, error = 0;
 946
 947                 if (!capable(CAP_SYS_ADMIN))
 948                         RETURN(-EPERM);
 949
 950                 OBD_ALLOC_PTR(oqctl);
 951                 if (!oqctl)
 952                         RETURN(-ENOMEM);
 953                 oqctl->qc_type = arg;
 954                 rc = obd_quotacheck(sbi->ll_md_exp, oqctl);
 955                 if (rc < 0) {
 956                         CDEBUG(D_INFO, "md_quotacheck failed: rc %d\n", rc);
 957                         error = rc;
 958                 }
 959
 960                 rc = obd_quotacheck(sbi->ll_dt_exp, oqctl);
 961                 if (rc < 0)
 962                         CDEBUG(D_INFO, "obd_quotacheck failed: rc %d\n", rc);
 963
 964                 OBD_FREE_PTR(oqctl);
 965                 return error ?: rc;
 966         }
 967         case OBD_IOC_POLL_QUOTACHECK: {
 968                 struct if_quotacheck *check;
 969                 int rc;
 970
 971                 if (!capable(CAP_SYS_ADMIN))
 972                         RETURN(-EPERM);
 973
 974                 OBD_ALLOC_PTR(check);
 975                 if (!check)
 976                         RETURN(-ENOMEM);
 977
 978                 rc = obd_iocontrol(cmd, sbi->ll_md_exp, 0, (void *)check,
 979                                    NULL);
 980                 if (rc) {
 981                         CDEBUG(D_QUOTA, "mdc ioctl %d failed: %d\n", cmd, rc);
 982                         if (copy_to_user((void *)arg, check, sizeof(*check)))
 983                                 rc = -EFAULT;
 984                         GOTO(out_poll, rc);
 985                 }
 986
 987                 rc = obd_iocontrol(cmd, sbi->ll_dt_exp, 0, (void *)check,
 988                                    NULL);
 989                 if (rc) {
 990                         CDEBUG(D_QUOTA, "osc ioctl %d failed: %d\n", cmd, rc);
 991                         if (copy_to_user((void *)arg, check, sizeof(*check)))
 992                                 rc = -EFAULT;
 993                         GOTO(out_poll, rc);
 994                 }
 995         out_poll:
 996                 OBD_FREE_PTR(check);
 997                 RETURN(rc);
 998         }
 999 #ifdef HAVE_QUOTA_SUPPORT
1000         case OBD_IOC_QUOTACTL: {
1001                 struct if_quotactl *qctl;
1002                 struct obd_quotactl *oqctl;
1003
1004                 int cmd, type, id, rc = 0;
1005
1006                 OBD_ALLOC_PTR(qctl);
1007                 if (!qctl)
1008                         RETURN(-ENOMEM);
1009
1010                 OBD_ALLOC_PTR(oqctl);
1011                 if (!oqctl) {
1012                         OBD_FREE_PTR(qctl);
1013                         RETURN(-ENOMEM);
1014                 }
1015                 if (copy_from_user(qctl, (void *)arg, sizeof(*qctl)))
1016                         GOTO(out_quotactl, rc = -EFAULT);
1017
1018                 cmd = qctl->qc_cmd;
1019                 type = qctl->qc_type;
1020                 id = qctl->qc_id;
1021                 switch (cmd) {
1022                 case Q_QUOTAON:
1023                 case Q_QUOTAOFF:
1024                 case Q_SETQUOTA:
1025                 case Q_SETINFO:
1026                         if (!capable(CAP_SYS_ADMIN))
1027                                 GOTO(out_quotactl, rc = -EPERM);
1028                         break;
1029                 case Q_GETQUOTA:
1030                         if (((type == USRQUOTA && current->euid != id) ||
1031                              (type == GRPQUOTA && !in_egroup_p(id))) &&
1032                             !capable(CAP_SYS_ADMIN))
1033                                 GOTO(out_quotactl, rc = -EPERM);
1034
1035                         /* XXX: dqb_valid is borrowed as a flag to mark that
1036                          *      only mds quota is wanted */
1037                         if (qctl->qc_dqblk.dqb_valid)
1038                                 qctl->obd_uuid = sbi->ll_md_exp->exp_obd->
1039                                                         u.cli.cl_target_uuid;
1040                         break;
1041                 case Q_GETINFO:
1042                         break;
1043                 default:
1044                         CERROR("unsupported quotactl op: %#x\n", cmd);
1045                         GOTO(out_quotactl, rc = -ENOTTY);
1046                 }
1047
1048                 QCTL_COPY(oqctl, qctl);
1049
1050                 if (qctl->obd_uuid.uuid[0]) {
1051                         struct obd_device *obd;
1052                         struct obd_uuid *uuid = &qctl->obd_uuid;
1053
1054                         obd = class_find_client_notype(uuid,
1055                                          &sbi->ll_dt_exp->exp_obd->obd_uuid);
1056                         if (!obd)
1057                                 GOTO(out_quotactl, rc = -ENOENT);
1058
1059                         if (cmd == Q_GETINFO)
1060                                 oqctl->qc_cmd = Q_GETOINFO;
1061                         else if (cmd == Q_GETQUOTA)
1062                                 oqctl->qc_cmd = Q_GETOQUOTA;
1063                         else
1064                                 GOTO(out_quotactl, rc = -EINVAL);
1065
1066                         if (sbi->ll_md_exp->exp_obd == obd) {
1067                                 rc = obd_quotactl(sbi->ll_md_exp, oqctl);
1068                         } else {
1069                                 int i;
1070                                 struct obd_export *exp;
1071                                 struct lov_obd *lov = &sbi->ll_dt_exp->
1072                                                             exp_obd->u.lov;
1073
1074                                 for (i = 0; i < lov->desc.ld_tgt_count; i++) {
1075                                         if (!lov->lov_tgts[i] ||
1076                                             !lov->lov_tgts[i]->ltd_active)
1077                                                 continue;
1078                                         exp = lov->lov_tgts[i]->ltd_exp;
1079                                         if (exp->exp_obd == obd) {
1080                                                 rc = obd_quotactl(exp, oqctl);
1081                                                 break;
1082                                         }
1083                                 }
1084                         }
1085
1086                         oqctl->qc_cmd = cmd;
1087                         QCTL_COPY(qctl, oqctl);
1088
1089                         if (copy_to_user((void *)arg, qctl, sizeof(*qctl)))
1090                                 rc = -EFAULT;
1091
1092                         GOTO(out_quotactl, rc);
1093                 }
1094
1095                 rc = obd_quotactl(sbi->ll_md_exp, oqctl);
1096                 if (rc && rc != -EBUSY && cmd == Q_QUOTAON) {
1097                         oqctl->qc_cmd = Q_QUOTAOFF;
1098                         obd_quotactl(sbi->ll_md_exp, oqctl);
1099                 }
1100
1101                 QCTL_COPY(qctl, oqctl);
1102
1103                 if (copy_to_user((void *)arg, qctl, sizeof(*qctl)))
1104                         rc = -EFAULT;
1105         out_quotactl:
1106                 OBD_FREE_PTR(qctl);
1107                 OBD_FREE_PTR(oqctl);
1108                 RETURN(rc);
1109         }
1110 #endif /* HAVE_QUOTA_SUPPORT */
1111         case OBD_IOC_GETNAME: {
1112                 struct obd_device *obd = class_exp2obd(sbi->ll_dt_exp);
1113                 if (!obd)
1114                         RETURN(-EFAULT);
1115                 if (copy_to_user((void *)arg, obd->obd_name,
1116                                 strlen(obd->obd_name) + 1))
1117                         RETURN (-EFAULT);
1118                 RETURN(0);
1119         }
1120         case LL_IOC_FLUSHCTX:
1121                 RETURN(ll_flush_ctx(inode));
1122 #ifdef CONFIG_FS_POSIX_ACL
1123         case LL_IOC_RMTACL: {
1124             if (sbi->ll_flags & LL_SBI_RMT_CLIENT &&
1125                 inode == inode->i_sb->s_root->d_inode) {
1126                 struct ll_file_data *fd = LUSTRE_FPRIVATE(file);
1127                 int rc;
1128
1129                 LASSERT(fd != NULL);
1130                 rc = rct_add(&sbi->ll_rct, cfs_curproc_pid(), arg);
1131                 if (!rc)
1132                         fd->fd_flags |= LL_FILE_RMTACL;
1133                 RETURN(rc);
1134             } else
1135                 RETURN(0);
1136         }
1137 #endif
1138         default:
1139                 RETURN(obd_iocontrol(cmd, sbi->ll_dt_exp,0,NULL,(void *)arg));
1140         }
1141 }
1142
1143 int ll_dir_open(struct inode *inode, struct file *file)
1144 {
1145         ENTRY;
1146         RETURN(ll_file_open(inode, file));
1147 }
1148
1149 int ll_dir_release(struct inode *inode, struct file *file)
1150 {
1151         ENTRY;
1152         RETURN(ll_file_release(inode, file));
1153 }
1154
1155 struct file_operations ll_dir_operations = {
1156         .open     = ll_dir_open,
1157         .release  = ll_dir_release,
1158         .read     = generic_read_dir,
1159         .readdir  = ll_readdir,
1160         .ioctl    = ll_dir_ioctl
1161 };
1162