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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  37 # include <linux/locks.h>   // for wait_on_buffer
  38 #else
  39 # include <linux/buffer_head.h>   // for wait_on_buffer
  40 #endif
  41
  42 #define DEBUG_SUBSYSTEM S_LLITE
  43
  44 #include <linux/obd_support.h>
  45 #include <linux/obd_class.h>
  46 #include <linux/lustre_lib.h>
  47 #include <linux/lustre_idl.h>
  48 #include <linux/lustre_mds.h>
  49 #include <linux/lustre_lite.h>
  50 #include <linux/lustre_dlm.h>
  51 #include "llite_internal.h"
  52
  53 typedef struct ext2_dir_entry_2 ext2_dirent;
  54
  55 #define PageChecked(page)        test_bit(PG_checked, &(page)->flags)
  56 #define SetPageChecked(page)     set_bit(PG_checked, &(page)->flags)
  57
  58 /* returns the page unlocked, but with a reference */
  59 static int ll_dir_readpage(struct file *file, struct page *page)
  60 {
  61         struct inode *inode = page->mapping->host;
  62         struct ll_fid mdc_fid;
  63         __u64 offset;
  64         struct ptlrpc_request *request;
  65         struct mds_body *body;
  66         int rc = 0;
  67         ENTRY;
  68
  69         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", inode->i_ino,
  70                inode->i_generation, inode);
  71
  72         mdc_pack_fid(&mdc_fid, inode->i_ino, inode->i_generation, S_IFDIR);
  73
  74         offset = page->index << PAGE_SHIFT;
  75         rc = mdc_readpage(ll_i2sbi(inode)->ll_mdc_exp, &mdc_fid,
  76                           offset, page, &request);
  77         if (!rc) {
  78                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
  79                 LASSERT (body != NULL);         /* checked by mdc_readpage() */
  80                 LASSERT_REPSWABBED (request, 0); /* swabbed by mdc_readpage() */
  81
  82                 inode->i_size = body->size;
  83                 SetPageUptodate(page);
  84         }
  85         ptlrpc_req_finished(request);
  86
  87         unlock_page(page);
  88         EXIT;
  89         return rc;
  90 }
  91
  92 struct address_space_operations ll_dir_aops = {
  93         readpage: ll_dir_readpage,
  94 };
  95
  96 /*
  97  * ext2 uses block-sized chunks. Arguably, sector-sized ones would be
  98  * more robust, but we have what we have
  99  */
 100 static inline unsigned ext2_chunk_size(struct inode *inode)
 101 {
 102         return inode->i_sb->s_blocksize;
 103 }
 104
 105 static inline void ext2_put_page(struct page *page)
 106 {
 107         kunmap(page);
 108         page_cache_release(page);
 109 }
 110
 111 static inline unsigned long dir_pages(struct inode *inode)
 112 {
 113         return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
 114 }
 115
 116
 117 static void ext2_check_page(struct page *page)
 118 {
 119         struct inode *dir = page->mapping->host;
 120         unsigned chunk_size = ext2_chunk_size(dir);
 121         char *kaddr = page_address(page);
 122         //      u32 max_inumber = le32_to_cpu(sb->u.ext2_sb.s_es->s_inodes_count);
 123         unsigned offs, rec_len;
 124         unsigned limit = PAGE_CACHE_SIZE;
 125         ext2_dirent *p;
 126         char *error;
 127
 128         if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
 129                 limit = dir->i_size & ~PAGE_CACHE_MASK;
 130                 if (limit & (chunk_size - 1)) {
 131                         CERROR("limit %d dir size %lld index %ld\n",
 132                                limit, dir->i_size, page->index);
 133                         goto Ebadsize;
 134                 }
 135                 for (offs = limit; offs<PAGE_CACHE_SIZE; offs += chunk_size) {
 136                         ext2_dirent *p = (ext2_dirent*)(kaddr + offs);
 137                         p->rec_len = cpu_to_le16(chunk_size);
 138                         p->name_len = 0;
 139                         p->inode = 0;
 140                 }
 141                 if (!limit)
 142                         goto out;
 143         }
 144         for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
 145                 p = (ext2_dirent *)(kaddr + offs);
 146                 rec_len = le16_to_cpu(p->rec_len);
 147
 148                 if (rec_len < EXT2_DIR_REC_LEN(1))
 149                         goto Eshort;
 150                 if (rec_len & 3)
 151                         goto Ealign;
 152                 if (rec_len < EXT2_DIR_REC_LEN(p->name_len))
 153                         goto Enamelen;
 154                 if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
 155                         goto Espan;
 156                 //              if (le32_to_cpu(p->inode) > max_inumber)
 157                 //goto Einumber;
 158         }
 159         if (offs != limit)
 160                 goto Eend;
 161 out:
 162         SetPageChecked(page);
 163         return;
 164
 165         /* Too bad, we had an error */
 166
 167 Ebadsize:
 168         CERROR("ext2_check_page"
 169                 "size of directory #%lu is not a multiple of chunk size\n",
 170                 dir->i_ino
 171         );
 172         goto fail;
 173 Eshort:
 174         error = "rec_len is smaller than minimal";
 175         goto bad_entry;
 176 Ealign:
 177         error = "unaligned directory entry";
 178         goto bad_entry;
 179 Enamelen:
 180         error = "rec_len is too small for name_len";
 181         goto bad_entry;
 182 Espan:
 183         error = "directory entry across blocks";
 184         goto bad_entry;
 185         //Einumber:
 186         // error = "inode out of bounds";
 187 bad_entry:
 188         CERROR("ext2_check_page: bad entry in directory #%lu: %s - "
 189                 "offset=%lu+%u, inode=%lu, rec_len=%d, name_len=%d",
 190                 dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT), offs,
 191                 (unsigned long) le32_to_cpu(p->inode),
 192                 rec_len, p->name_len);
 193         goto fail;
 194 Eend:
 195         p = (ext2_dirent *)(kaddr + offs);
 196         CERROR("ext2_check_page"
 197                 "entry in directory #%lu spans the page boundary"
 198                 "offset=%lu, inode=%lu",
 199                 dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
 200                 (unsigned long) le32_to_cpu(p->inode));
 201 fail:
 202         SetPageChecked(page);
 203         SetPageError(page);
 204         LBUG();
 205 }
 206
 207 static struct page *ll_get_dir_page(struct inode *dir, unsigned long n)
 208 {
 209         struct ldlm_res_id res_id =
 210                 { .name = { dir->i_ino, (__u64)dir->i_generation} };
 211         struct lustre_handle lockh;
 212         struct obd_device *obddev = class_exp2obd(ll_i2sbi(dir)->ll_mdc_exp);
 213         struct address_space *mapping = dir->i_mapping;
 214         struct page *page;
 215         ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } };
 216         int rc;
 217
 218         rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
 219                              &res_id, LDLM_IBITS, &policy, LCK_PR, &lockh);
 220         if (!rc) {
 221                 struct lookup_intent it = { .it_op = IT_READDIR };
 222                 struct ptlrpc_request *request;
 223                 struct mdc_op_data data;
 224
 225                 ll_prepare_mdc_op_data(&data, dir, NULL, NULL, 0, 0);
 226
 227                 rc = mdc_enqueue(ll_i2sbi(dir)->ll_mdc_exp, LDLM_IBITS, &it,
 228                                  LCK_PR, &data, &lockh, NULL, 0,
 229                                  ldlm_completion_ast, ll_mdc_blocking_ast, dir);
 230
 231                 request = (struct ptlrpc_request *)it.d.lustre.it_data;
 232                 if (request)
 233                         ptlrpc_req_finished(request);
 234                 if (rc < 0) {
 235                         CERROR("lock enqueue: rc: %d\n", rc);
 236                         return ERR_PTR(rc);
 237                 }
 238         }
 239         ldlm_lock_dump_handle(D_OTHER, &lockh);
 240
 241         page = read_cache_page(mapping, n,
 242                                (filler_t*)mapping->a_ops->readpage, NULL);
 243         if (!IS_ERR(page)) {
 244                 wait_on_page(page);
 245                 (void)kmap(page);
 246                 if (!PageUptodate(page))
 247                         goto fail;
 248                 if (!PageChecked(page))
 249                         ext2_check_page(page);
 250                 if (PageError(page))
 251                         goto fail;
 252         }
 253
 254 out_unlock:
 255         ldlm_lock_decref(&lockh, LCK_PR);
 256         return page;
 257
 258 fail:
 259         ext2_put_page(page);
 260         page = ERR_PTR(-EIO);
 261         goto out_unlock;
 262 }
 263
 264 /*
 265  * p is at least 6 bytes before the end of page
 266  */
 267 static inline ext2_dirent *ext2_next_entry(ext2_dirent *p)
 268 {
 269         return (ext2_dirent *)((char*)p + le16_to_cpu(p->rec_len));
 270 }
 271
 272 static inline unsigned
 273 ext2_validate_entry(char *base, unsigned offset, unsigned mask)
 274 {
 275         ext2_dirent *de = (ext2_dirent*)(base + offset);
 276         ext2_dirent *p = (ext2_dirent*)(base + (offset&mask));
 277         while ((char*)p < (char*)de)
 278                 p = ext2_next_entry(p);
 279         return (char *)p - base;
 280 }
 281
 282 static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
 283         [EXT2_FT_UNKNOWN]       DT_UNKNOWN,
 284         [EXT2_FT_REG_FILE]      DT_REG,
 285         [EXT2_FT_DIR]           DT_DIR,
 286         [EXT2_FT_CHRDEV]        DT_CHR,
 287         [EXT2_FT_BLKDEV]        DT_BLK,
 288         [EXT2_FT_FIFO]          DT_FIFO,
 289         [EXT2_FT_SOCK]          DT_SOCK,
 290         [EXT2_FT_SYMLINK]       DT_LNK,
 291 };
 292
 293
 294 int ll_readdir(struct file * filp, void * dirent, filldir_t filldir)
 295 {
 296         struct inode *inode = filp->f_dentry->d_inode;
 297         loff_t pos = filp->f_pos;
 298         // XXX struct super_block *sb = inode->i_sb;
 299         unsigned offset = pos & ~PAGE_CACHE_MASK;
 300         unsigned long n = pos >> PAGE_CACHE_SHIFT;
 301         unsigned long npages = dir_pages(inode);
 302         unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
 303         unsigned char *types = NULL;
 304         int need_revalidate = (filp->f_version != inode->i_version);
 305         int rc = 0;
 306         ENTRY;
 307
 308         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) pos %llu/%llu\n",
 309                inode->i_ino, inode->i_generation, inode, pos, inode->i_size);
 310
 311         if (pos > inode->i_size - EXT2_DIR_REC_LEN(1))
 312                 RETURN(0);
 313
 314         types = ext2_filetype_table;
 315
 316         for ( ; n < npages; n++, offset = 0) {
 317                 char *kaddr, *limit;
 318                 ext2_dirent *de;
 319                 struct page *page;
 320
 321                 CDEBUG(D_EXT2,"read %lu of dir %lu/%u page %lu/%lu size %llu\n",
 322                        PAGE_CACHE_SIZE, inode->i_ino, inode->i_generation,
 323                        n, npages, inode->i_size);
 324                 page = ll_get_dir_page(inode, n);
 325
 326                 /* size might have been updated by mdc_readpage */
 327                 npages = dir_pages(inode);
 328
 329                 if (IS_ERR(page)) {
 330                         rc = PTR_ERR(page);
 331                         CERROR("error reading dir %lu/%u page %lu: rc %d\n",
 332                                inode->i_ino, inode->i_generation, n, rc);
 333                         continue;
 334                 }
 335
 336                 kaddr = page_address(page);
 337                 if (need_revalidate) {
 338                         offset = ext2_validate_entry(kaddr, offset, chunk_mask);
 339                         need_revalidate = 0;
 340                 }
 341                 de = (ext2_dirent *)(kaddr+offset);
 342                 limit = kaddr + PAGE_CACHE_SIZE - EXT2_DIR_REC_LEN(1);
 343                 for ( ;(char*)de <= limit; de = ext2_next_entry(de)) {
 344                         if (de->inode) {
 345                                 int over;
 346                                 unsigned char d_type = DT_UNKNOWN;
 347
 348                                 rc = 0; /* no error if we return something */
 349                                 if (types && de->file_type < EXT2_FT_MAX)
 350                                         d_type = types[de->file_type];
 351
 352                                 offset = (char *)de - kaddr;
 353                                 over = filldir(dirent, de->name, de->name_len,
 354                                                (n<<PAGE_CACHE_SHIFT) | offset,
 355                                                le32_to_cpu(de->inode), d_type);
 356                                 if (over) {
 357                                         ext2_put_page(page);
 358                                         GOTO(done, rc);
 359                                 }
 360                         }
 361                 }
 362                 ext2_put_page(page);
 363         }
 364
 365 done:
 366         filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
 367         filp->f_version = inode->i_version;
 368         update_atime(inode);
 369         RETURN(rc);
 370 }
 371
 372 static int ll_dir_ioctl(struct inode *inode, struct file *file,
 373                         unsigned int cmd, unsigned long arg)
 374 {
 375         struct ll_sb_info *sbi = ll_i2sbi(inode);
 376         struct obd_ioctl_data *data;
 377         ENTRY;
 378
 379         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), cmd=%#x\n",
 380                inode->i_ino, inode->i_generation, inode, cmd);
 381
 382         if (_IOC_TYPE(cmd) == 'T') /* tty ioctls */
 383                 return -ENOTTY;
 384
 385         lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, LPROC_LL_IOCTL);
 386         switch(cmd) {
 387         case EXT3_IOC_GETFLAGS:
 388         case EXT3_IOC_SETFLAGS:
 389                 RETURN(ll_iocontrol(inode, file, cmd, arg));
 390         case IOC_MDC_LOOKUP: {
 391                 struct ptlrpc_request *request = NULL;
 392                 struct ll_fid fid;
 393                 char *buf = NULL;
 394                 char *filename;
 395                 int namelen, rc, len = 0;
 396                 unsigned long valid;
 397
 398                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 399                 if (rc)
 400                         RETURN(rc);
 401                 data = (void *)buf;
 402
 403                 filename = data->ioc_inlbuf1;
 404                 namelen = data->ioc_inllen1;
 405
 406                 if (namelen < 1) {
 407                         CDEBUG(D_INFO, "IOC_MDC_LOOKUP missing filename\n");
 408                         GOTO(out, rc = -EINVAL);
 409                 }
 410
 411                 valid = OBD_MD_FLID;
 412                 ll_inode2fid(&fid, inode);
 413                 rc = mdc_getattr_name(sbi->ll_mdc_exp, &fid,
 414                                       filename, namelen, valid, 0, &request);
 415                 if (rc < 0) {
 416                         CDEBUG(D_INFO, "mdc_getattr_name: %d\n", rc);
 417                         GOTO(out, rc);
 418                 }
 419
 420                 ptlrpc_req_finished(request);
 421
 422                 EXIT;
 423         out:
 424                 obd_ioctl_freedata(buf, len);
 425                 return rc;
 426         }
 427         case LL_IOC_LOV_SETSTRIPE: {
 428                 struct ptlrpc_request *request = NULL;
 429                 struct mdc_op_data op_data;
 430                 struct iattr attr = { 0 };
 431                 struct lov_user_md lum, *lump = (struct lov_user_md *)arg;
 432                 int rc = 0;
 433
 434                 ll_prepare_mdc_op_data(&op_data, inode, NULL, NULL, 0, 0);
 435
 436                 LASSERT(sizeof(lum) == sizeof(*lump));
 437                 LASSERT(sizeof(lum.lmm_objects[0]) ==
 438                         sizeof(lump->lmm_objects[0]));
 439                 rc = copy_from_user(&lum, lump, sizeof(lum));
 440                 if (rc)
 441                         return(-EFAULT);
 442
 443                 if (lum.lmm_magic != LOV_USER_MAGIC)
 444                         RETURN(-EINVAL);
 445
 446                 rc = mdc_setattr(sbi->ll_mdc_exp, &op_data,
 447                                  &attr, &lum, sizeof(lum), NULL, 0, &request);
 448                 if (rc) {
 449                         ptlrpc_req_finished(request);
 450                         if (rc != -EPERM && rc != -EACCES)
 451                                 CERROR("mdc_setattr fails: rc = %d\n", rc);
 452                         return rc;
 453                 }
 454                 ptlrpc_req_finished(request);
 455
 456                 return rc;
 457         }
 458         case LL_IOC_LOV_GETSTRIPE: {
 459                 struct ptlrpc_request *request = NULL;
 460                 struct lov_user_md *lump = (struct lov_user_md *)arg;
 461                 struct lov_mds_md *lmm;
 462                 struct ll_fid fid;
 463                 struct mds_body *body;
 464                 unsigned long valid = 0;
 465                 int rc, lmmsize;
 466
 467                 valid |= OBD_MD_FLDIREA;
 468
 469                 ll_inode2fid(&fid, inode);
 470                 rc = mdc_getattr(sbi->ll_mdc_exp, &fid, valid,
 471                                  obd_size_diskmd(sbi->ll_osc_exp, NULL),
 472                                  &request);
 473                 if (rc < 0) {
 474                         CDEBUG(D_INFO, "mdc_getattr failed: rc = %d\n", rc);
 475                         RETURN(rc);
 476                 }
 477
 478                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof(*body));
 479                 LASSERT(body != NULL);         /* checked by mdc_getattr_name */
 480                 LASSERT_REPSWABBED(request, 0);/* swabbed by mdc_getattr_name */
 481
 482                 lmmsize = body->eadatasize;
 483                 if (lmmsize == 0)
 484                         GOTO(out_get, rc = -ENODATA);
 485
 486                 lmm = lustre_msg_buf(request->rq_repmsg, 1, lmmsize);
 487                 LASSERT(lmm != NULL);
 488                 LASSERT_REPSWABBED(request, 1);
 489                 rc = copy_to_user(lump, lmm, lmmsize);
 490                 if (rc)
 491                         GOTO(out_get, rc = -EFAULT);
 492
 493                 EXIT;
 494         out_get:
 495                 ptlrpc_req_finished(request);
 496                 RETURN(rc);
 497         }
 498         case IOC_MDC_GETSTRIPE: {
 499                 struct ptlrpc_request *request = NULL;
 500                 struct ll_fid fid;
 501                 struct mds_body *body;
 502                 struct lov_user_md *lump = (struct lov_user_md *)arg;
 503                 struct lov_mds_md *lmm;
 504                 char *filename;
 505                 int rc, lmmsize;
 506
 507                 filename = getname((const char *)arg);
 508                 if (IS_ERR(filename))
 509                         RETURN(PTR_ERR(filename));
 510
 511                 ll_inode2fid(&fid, inode);
 512                 rc = mdc_getattr_name(sbi->ll_mdc_exp, &fid, filename,
 513                                       strlen(filename)+1, OBD_MD_FLEASIZE,
 514                                       obd_size_diskmd(sbi->ll_osc_exp, NULL),
 515                                       &request);
 516                 if (rc < 0) {
 517                         CDEBUG(D_INFO, "mdc_getattr_name failed on %s: rc %d\n",
 518                                filename, rc);
 519                         GOTO(out_name, rc);
 520                 }
 521
 522                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
 523                 LASSERT(body != NULL);         /* checked by mdc_getattr_name */
 524                 LASSERT_REPSWABBED(request, 0);/* swabbed by mdc_getattr_name */
 525
 526                 lmmsize = body->eadatasize;
 527
 528                 if (!(body->valid & OBD_MD_FLEASIZE) || lmmsize == 0)
 529                         GOTO(out_req, rc = -ENODATA);
 530
 531                 if (lmmsize > 4096)
 532                         GOTO(out_req, rc = -EFBIG);
 533
 534                 lmm = lustre_msg_buf(request->rq_repmsg, 1, lmmsize);
 535                 LASSERT(lmm != NULL);
 536                 LASSERT_REPSWABBED(request, 1);
 537
 538                 rc = copy_to_user(lump, lmm, lmmsize);
 539                 if (rc)
 540                         GOTO(out_req, rc = -EFAULT);
 541
 542                 EXIT;
 543         out_req:
 544                 ptlrpc_req_finished(request);
 545         out_name:
 546                 putname(filename);
 547                 return rc;
 548         }
 549         case OBD_IOC_PING: {
 550                 struct ptlrpc_request *req = NULL;
 551                 char *buf = NULL;
 552                 int rc, len=0;
 553                 struct client_obd *cli;
 554                 struct obd_device *obd;
 555
 556                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 557                 if (rc)
 558                         RETURN(rc);
 559                 data = (void *)buf;
 560
 561                 obd = class_name2obd(data->ioc_inlbuf1);
 562
 563                 if (!obd )
 564                         GOTO(out_ping, rc = -ENODEV);
 565
 566                 if (!obd->obd_attached) {
 567                         CERROR("Device %d not attached\n", obd->obd_minor);
 568                         GOTO(out_ping, rc = -ENODEV);
 569                 }
 570                 if (!obd->obd_set_up) {
 571                         CERROR("Device %d still not setup\n", obd->obd_minor);
 572                         GOTO(out_ping, rc = -ENODEV);
 573                 }
 574                 cli = &obd->u.cli;
 575                 req = ptlrpc_prep_req(cli->cl_import, OBD_PING, 0, NULL, NULL);
 576                 if (!req)
 577                         GOTO(out_ping, rc = -ENOMEM);
 578
 579                 req->rq_replen = lustre_msg_size(0, NULL);
 580                 req->rq_send_state = LUSTRE_IMP_FULL;
 581
 582                 rc = ptlrpc_queue_wait(req);
 583
 584                 ptlrpc_req_finished(req);
 585         out_ping:
 586                 obd_ioctl_freedata(buf, len);
 587                 return rc;
 588         }
 589         case OBD_IOC_LLOG_CATINFO: {
 590                 struct ptlrpc_request *req = NULL;
 591                 char *buf = NULL;
 592                 int rc, len = 0;
 593                 char *bufs[2], *str;
 594                 int lens[2], size;
 595
 596                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 597                 if (rc)
 598                         RETURN(rc);
 599                 data = (void *)buf;
 600
 601                 if (!data->ioc_inlbuf1) {
 602                         obd_ioctl_freedata(buf, len);
 603                         RETURN(-EINVAL);
 604                 }
 605
 606                 lens[0] = data->ioc_inllen1;
 607                 bufs[0] = data->ioc_inlbuf1;
 608                 if (data->ioc_inllen2) {
 609                         lens[1] = data->ioc_inllen2;
 610                         bufs[1] = data->ioc_inlbuf2;
 611                 } else {
 612                         lens[1] = 0;
 613                         bufs[1] = NULL;
 614                 }
 615                 size = data->ioc_plen1;
 616                 req = ptlrpc_prep_req(sbi2mdc(sbi)->cl_import, LLOG_CATINFO,
 617                                       2, lens, bufs);
 618                 if (!req)
 619                         GOTO(out_catinfo, rc = -ENOMEM);
 620                 req->rq_replen = lustre_msg_size(1, &size);
 621
 622                 rc = ptlrpc_queue_wait(req);
 623                 str = lustre_msg_string(req->rq_repmsg, 0, data->ioc_plen1);
 624                 if (!rc)
 625                         rc = copy_to_user(data->ioc_pbuf1, str,
 626                                           data->ioc_plen1);
 627                 ptlrpc_req_finished(req);
 628         out_catinfo:
 629                 obd_ioctl_freedata(buf, len);
 630                 RETURN(rc);
 631         }
 632         default:
 633                 return obd_iocontrol(cmd, sbi->ll_osc_exp,0,NULL,(void *)arg);
 634         }
 635 }
 636
 637 int ll_dir_open(struct inode *inode, struct file *file)
 638 {
 639         return ll_file_open(inode, file);
 640 }
 641
 642 int ll_dir_release(struct inode *inode, struct file *file)
 643 {
 644         return ll_file_release(inode, file);
 645 }
 646
 647 struct file_operations ll_dir_operations = {
 648         open: ll_dir_open,
 649         release: ll_dir_release,
 650         read: generic_read_dir,
 651         readdir: ll_readdir,
 652         ioctl: ll_dir_ioctl
 653 };
 654