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/file.h>
  37 #include <linux/kmod.h>
  38 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
  39 # include <linux/locks.h>   // for wait_on_buffer
  40 #else
  41 # include <linux/buffer_head.h>   // for wait_on_buffer
  42 #endif
  43
  44 #define DEBUG_SUBSYSTEM S_LLITE
  45
  46 #include <linux/obd_support.h>
  47 #include <linux/obd_class.h>
  48 #include <linux/lustre_lib.h>
  49 #include <linux/lustre_idl.h>
  50 #include <linux/lustre_mds.h>
  51 #include <linux/lustre_lite.h>
  52 #include <linux/lustre_dlm.h>
  53 #include "llite_internal.h"
  54
  55 typedef struct ext2_dir_entry_2 ext2_dirent;
  56
  57 #define PageChecked(page)        test_bit(PG_checked, &(page)->flags)
  58 #define SetPageChecked(page)     set_bit(PG_checked, &(page)->flags)
  59
  60 /* returns the page unlocked, but with a reference */
  61 static int ll_dir_readpage(struct file *file, struct page *page)
  62 {
  63         struct inode *inode = page->mapping->host;
  64         struct ptlrpc_request *request;
  65         struct mds_body *body;
  66         struct lustre_id id;
  67         __u64 offset;
  68         int rc = 0;
  69         ENTRY;
  70
  71         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p)\n", inode->i_ino,
  72                inode->i_generation, inode);
  73
  74         mdc_pack_id(&id, inode->i_ino, inode->i_generation,
  75                     S_IFDIR, id_group(&ll_i2info(inode)->lli_id),
  76                     id_fid(&ll_i2info(inode)->lli_id));
  77
  78         offset = page->index << PAGE_SHIFT;
  79         rc = md_readpage(ll_i2sbi(inode)->ll_lmv_exp, &id, offset,
  80                          page, &request);
  81         if (!rc) {
  82                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof(*body));
  83                 LASSERT (body != NULL);          /* checked by md_readpage() */
  84                 LASSERT_REPSWABBED (request, 0); /* swabbed by md_readpage() */
  85
  86 #warning "FIXME ASAP!"
  87                 //inode->i_size = body->size;
  88                 SetPageUptodate(page);
  89         }
  90         ptlrpc_req_finished(request);
  91
  92         unlock_page(page);
  93         RETURN(rc);
  94 }
  95
  96 struct address_space_operations ll_dir_aops = {
  97         .readpage  = ll_dir_readpage,
  98 };
  99
 100 /*
 101  * ext2 uses block-sized chunks. Arguably, sector-sized ones would be
 102  * more robust, but we have what we have
 103  */
 104 static inline unsigned ext2_chunk_size(struct inode *inode)
 105 {
 106         return inode->i_sb->s_blocksize;
 107 }
 108
 109 static inline void ext2_put_page(struct page *page)
 110 {
 111         kunmap(page);
 112         page_cache_release(page);
 113 }
 114
 115 static inline unsigned long dir_pages(struct inode *inode)
 116 {
 117         return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
 118 }
 119
 120 static void ext2_check_page(struct page *page)
 121 {
 122         struct inode *dir = page->mapping->host;
 123         unsigned chunk_size = ext2_chunk_size(dir);
 124         char *kaddr = page_address(page);
 125         //      u32 max_inumber = le32_to_cpu(sb->u.ext2_sb.s_es->s_inodes_count);
 126         unsigned offs, rec_len;
 127         unsigned limit = PAGE_CACHE_SIZE;
 128         ext2_dirent *p;
 129         char *error;
 130
 131         if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
 132                 limit = dir->i_size & ~PAGE_CACHE_MASK;
 133                 if (limit & (chunk_size - 1)) {
 134                         CERROR("limit %d dir size %lld index %ld\n",
 135                                limit, dir->i_size, page->index);
 136                         goto Ebadsize;
 137                 }
 138                 for (offs = limit; offs<PAGE_CACHE_SIZE; offs += chunk_size) {
 139                         ext2_dirent *p = (ext2_dirent*)(kaddr + offs);
 140                         p->rec_len = cpu_to_le16(chunk_size);
 141                         p->name_len = 0;
 142                         p->inode = 0;
 143                 }
 144                 if (!limit)
 145                         goto out;
 146         }
 147         for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
 148                 p = (ext2_dirent *)(kaddr + offs);
 149                 rec_len = le16_to_cpu(p->rec_len);
 150
 151                 if (rec_len < EXT2_DIR_REC_LEN(1))
 152                         goto Eshort;
 153                 if (rec_len & 3)
 154                         goto Ealign;
 155                 if (rec_len < EXT2_DIR_REC_LEN(p->name_len))
 156                         goto Enamelen;
 157                 if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
 158                         goto Espan;
 159                 //              if (le32_to_cpu(p->inode) > max_inumber)
 160                 //goto Einumber;
 161         }
 162         if (offs != limit)
 163                 goto Eend;
 164 out:
 165         SetPageChecked(page);
 166         return;
 167
 168         /* Too bad, we had an error */
 169
 170 Ebadsize:
 171         CERROR("ext2_check_page"
 172                 "size of directory #%lu is not a multiple of chunk size\n",
 173                 dir->i_ino
 174         );
 175         goto fail;
 176 Eshort:
 177         error = "rec_len is smaller than minimal";
 178         goto bad_entry;
 179 Ealign:
 180         error = "unaligned directory entry";
 181         goto bad_entry;
 182 Enamelen:
 183         error = "rec_len is too small for name_len";
 184         goto bad_entry;
 185 Espan:
 186         error = "directory entry across blocks";
 187         goto bad_entry;
 188         //Einumber:
 189         // error = "inode out of bounds";
 190 bad_entry:
 191         CERROR("ext2_check_page: bad entry in directory #%lu: %s - "
 192                 "offset=%lu+%u, inode=%lu, rec_len=%d, name_len=%d",
 193                 dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT), offs,
 194                 (unsigned long) le32_to_cpu(p->inode),
 195                 rec_len, p->name_len);
 196         goto fail;
 197 Eend:
 198         p = (ext2_dirent *)(kaddr + offs);
 199         CERROR("ext2_check_page"
 200                 "entry in directory #%lu spans the page boundary"
 201                 "offset=%lu, inode=%lu",
 202                 dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
 203                 (unsigned long) le32_to_cpu(p->inode));
 204 fail:
 205         SetPageChecked(page);
 206         SetPageError(page);
 207 }
 208
 209 static struct page *ll_get_dir_page(struct inode *dir, unsigned long n)
 210 {
 211         struct ll_inode_info *li = ll_i2info(dir);
 212         struct ldlm_res_id res_id =
 213                 { .name = { id_fid(&li->lli_id), id_group(&li->lli_id)} };
 214         struct lustre_handle lockh;
 215         struct obd_device *obddev = class_exp2obd(ll_i2sbi(dir)->ll_lmv_exp);
 216         struct address_space *mapping = dir->i_mapping;
 217         struct page *page;
 218         ldlm_policy_data_t policy = { .l_inodebits = { MDS_INODELOCK_UPDATE } };
 219         int rc;
 220
 221         obddev = md_get_real_obd(ll_i2sbi(dir)->ll_lmv_exp, NULL, 0);
 222         rc = ldlm_lock_match(obddev->obd_namespace, LDLM_FL_BLOCK_GRANTED,
 223                              &res_id, LDLM_IBITS, &policy, LCK_PR, &lockh);
 224         if (!rc) {
 225                 struct lookup_intent it = { .it_op = IT_READDIR };
 226                 struct ptlrpc_request *request;
 227                 struct mdc_op_data *op_data;
 228
 229                 OBD_ALLOC(op_data, sizeof(*op_data));
 230                 if (op_data == NULL)
 231                         RETURN(ERR_PTR(-ENOMEM));
 232
 233                 ll_prepare_mdc_data(op_data, dir, NULL, NULL, 0, 0);
 234
 235                 rc = md_enqueue(ll_i2sbi(dir)->ll_lmv_exp, LDLM_IBITS, &it,
 236                                 LCK_PR, op_data, &lockh, NULL, 0,
 237                                 ldlm_completion_ast, ll_mdc_blocking_ast, dir);
 238                 OBD_FREE(op_data, sizeof(*op_data));
 239
 240                 request = (struct ptlrpc_request *)it.d.lustre.it_data;
 241                 if (request)
 242                         ptlrpc_req_finished(request);
 243                 if (rc < 0) {
 244                         CERROR("lock enqueue: rc: %d\n", rc);
 245                         return ERR_PTR(rc);
 246                 }
 247         }
 248         ldlm_lock_dump_handle(D_OTHER, &lockh);
 249
 250         page = read_cache_page(mapping, n,
 251                                (filler_t*)mapping->a_ops->readpage, NULL);
 252         if (!IS_ERR(page)) {
 253                 wait_on_page(page);
 254                 (void)kmap(page);
 255                 if (!PageUptodate(page))
 256                         goto fail;
 257                 if (!PageChecked(page))
 258                         ext2_check_page(page);
 259                 if (PageError(page))
 260                         goto fail;
 261         }
 262
 263 out_unlock:
 264         ldlm_lock_decref(&lockh, LCK_PR);
 265         return page;
 266
 267 fail:
 268         ext2_put_page(page);
 269         page = ERR_PTR(-EIO);
 270         goto out_unlock;
 271 }
 272
 273 /*
 274  * p is at least 6 bytes before the end of page
 275  */
 276 static inline ext2_dirent *ext2_next_entry(ext2_dirent *p)
 277 {
 278         return (ext2_dirent *)((char*)p + le16_to_cpu(p->rec_len));
 279 }
 280
 281 static inline unsigned
 282 ext2_validate_entry(char *base, unsigned offset, unsigned mask)
 283 {
 284         ext2_dirent *de = (ext2_dirent*)(base + offset);
 285         ext2_dirent *p = (ext2_dirent*)(base + (offset&mask));
 286         while ((char*)p < (char*)de)
 287                 p = ext2_next_entry(p);
 288         return (char *)p - base;
 289 }
 290
 291 static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
 292         [EXT2_FT_UNKNOWN]       DT_UNKNOWN,
 293         [EXT2_FT_REG_FILE]      DT_REG,
 294         [EXT2_FT_DIR]           DT_DIR,
 295         [EXT2_FT_CHRDEV]        DT_CHR,
 296         [EXT2_FT_BLKDEV]        DT_BLK,
 297         [EXT2_FT_FIFO]          DT_FIFO,
 298         [EXT2_FT_SOCK]          DT_SOCK,
 299         [EXT2_FT_SYMLINK]       DT_LNK,
 300 };
 301
 302
 303 int ll_readdir(struct file * filp, void * dirent, filldir_t filldir)
 304 {
 305         struct inode *inode = filp->f_dentry->d_inode;
 306         loff_t pos = filp->f_pos;
 307         // XXX struct super_block *sb = inode->i_sb;
 308         unsigned offset = pos & ~PAGE_CACHE_MASK;
 309         unsigned long n = pos >> PAGE_CACHE_SHIFT;
 310         unsigned long npages = dir_pages(inode);
 311         unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
 312         unsigned char *types = ext2_filetype_table;
 313         int need_revalidate = (filp->f_version != inode->i_version);
 314         int rc = 0;
 315         ENTRY;
 316
 317         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) pos %llu/%llu\n",
 318                inode->i_ino, inode->i_generation, inode, pos, inode->i_size);
 319
 320         if (pos > inode->i_size - EXT2_DIR_REC_LEN(1))
 321                 RETURN(0);
 322
 323         for ( ; n < npages; n++, offset = 0) {
 324                 char *kaddr, *limit;
 325                 ext2_dirent *de;
 326                 struct page *page;
 327
 328                 CDEBUG(D_EXT2,"read %lu of dir %lu/%u page %lu/%lu size %llu\n",
 329                        PAGE_CACHE_SIZE, inode->i_ino, inode->i_generation,
 330                        n, npages, inode->i_size);
 331                 page = ll_get_dir_page(inode, n);
 332
 333                 /* size might have been updated by md_readpage() */
 334                 npages = dir_pages(inode);
 335
 336                 if (IS_ERR(page)) {
 337                         rc = PTR_ERR(page);
 338                         CERROR("error reading dir %lu/%u page %lu: rc %d\n",
 339                                inode->i_ino, inode->i_generation, n, rc);
 340                         continue;
 341                 }
 342
 343                 kaddr = page_address(page);
 344                 if (need_revalidate) {
 345                         offset = ext2_validate_entry(kaddr, offset, chunk_mask);
 346                         need_revalidate = 0;
 347                 }
 348                 de = (ext2_dirent *)(kaddr+offset);
 349                 limit = kaddr + PAGE_CACHE_SIZE - EXT2_DIR_REC_LEN(1);
 350                 for ( ;(char*)de <= limit; de = ext2_next_entry(de)) {
 351                         if (de->inode) {
 352                                 int over;
 353
 354                                 rc = 0; /* no error if we return something */
 355
 356                                 offset = (char *)de - kaddr;
 357                                 over = filldir(dirent, de->name, de->name_len,
 358                                                (n<<PAGE_CACHE_SHIFT) | offset,
 359                                                le32_to_cpu(de->inode),
 360                                                types[de->file_type &
 361                                                      (EXT2_FT_MAX - 1)]);
 362
 363                                 if (over) {
 364                                         ext2_put_page(page);
 365                                         GOTO(done, rc);
 366                                 }
 367                         }
 368                 }
 369                 ext2_put_page(page);
 370         }
 371
 372         EXIT;
 373 done:
 374         filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
 375         filp->f_version = inode->i_version;
 376         update_atime(inode);
 377         return rc;
 378 }
 379
 380 static int ll_mkdir_stripe(struct inode *inode, unsigned long arg)
 381 {
 382         struct ptlrpc_request *request = NULL;
 383         struct ll_sb_info *sbi = ll_i2sbi(inode);
 384         struct ll_user_mkdir_stripe lums;
 385         struct mdc_op_data *op_data;
 386         u16 nstripes;
 387         mode_t mode;
 388         char *name;
 389         int err = 0;
 390         ENTRY;
 391
 392         if (copy_from_user(&lums, (void *)arg, sizeof(lums)))
 393                 RETURN(-EFAULT);
 394
 395         if (lums.lums_namelen <= 0)
 396                 RETURN(-EINVAL);
 397         OBD_ALLOC(name, lums.lums_namelen);
 398         if (!name)
 399                 RETURN(-ENOMEM);
 400
 401         if (copy_from_user(name, lums.lums_name, lums.lums_namelen))
 402                 GOTO(out, err = -EFAULT);
 403
 404         CDEBUG(D_VFSTRACE, "ioctl Op:name=%s,dir=%lu/%u(%p)\n",
 405                name, inode->i_ino, inode->i_generation, inode);
 406         nstripes = lums.lums_nstripes;
 407
 408         mode = lums.lums_mode;
 409         mode = (mode & (S_IRWXUGO|S_ISVTX) & ~current->fs->umask) | S_IFDIR;
 410
 411         OBD_ALLOC(op_data, sizeof(*op_data));
 412         if (op_data == NULL)
 413                 GOTO(out, err = -ENOMEM);
 414         ll_prepare_mdc_data(op_data, inode, NULL, name,lums.lums_namelen,0);
 415         err = md_create(sbi->ll_lmv_exp, op_data, &nstripes, sizeof(nstripes),
 416                         mode, current->fsuid, current->fsgid, 0, &request);
 417         OBD_FREE(op_data, sizeof(*op_data));
 418         ptlrpc_req_finished(request);
 419         EXIT;
 420 out:
 421         OBD_FREE(name, lums.lums_namelen);
 422         return err;
 423 }
 424
 425 static int ll_dir_ioctl(struct inode *inode, struct file *file,
 426                         unsigned int cmd, unsigned long arg)
 427 {
 428         struct ll_sb_info *sbi = ll_i2sbi(inode);
 429         struct obd_ioctl_data *data;
 430         ENTRY;
 431
 432         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), cmd=%#x\n",
 433                inode->i_ino, inode->i_generation, inode, cmd);
 434
 435         if (_IOC_TYPE(cmd) == 'T') /* tty ioctls */
 436                 return -ENOTTY;
 437
 438         lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, LPROC_LL_IOCTL);
 439         switch(cmd) {
 440         case EXT3_IOC_GETFLAGS:
 441         case EXT3_IOC_SETFLAGS:
 442                 RETURN(ll_iocontrol(inode, file, cmd, arg));
 443         case IOC_MDC_LOOKUP: {
 444                 struct ptlrpc_request *request = NULL;
 445                 struct lustre_id id;
 446                 char *buf = NULL;
 447                 char *filename;
 448                 int namelen, rc, len = 0;
 449                 __u64 valid;
 450
 451                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 452                 if (rc)
 453                         RETURN(rc);
 454                 data = (void *)buf;
 455
 456                 filename = data->ioc_inlbuf1;
 457                 namelen = data->ioc_inllen1;
 458
 459                 if (namelen < 1) {
 460                         CDEBUG(D_INFO, "IOC_MDC_LOOKUP missing filename\n");
 461                         GOTO(out, rc = -EINVAL);
 462                 }
 463
 464                 valid = OBD_MD_FLID;
 465                 ll_inode2id(&id, inode);
 466                 rc = md_getattr_lock(sbi->ll_lmv_exp, &id,
 467                                      filename, namelen, valid, 0, &request);
 468                 if (rc < 0) {
 469                         CDEBUG(D_INFO, "md_getattr_lock: %d\n", rc);
 470                         GOTO(out, rc);
 471                 }
 472
 473                 ptlrpc_req_finished(request);
 474
 475                 EXIT;
 476         out:
 477                 obd_ioctl_freedata(buf, len);
 478                 return rc;
 479         }
 480         case LL_IOC_MDC_MKDIRSTRIPE:
 481                 RETURN(ll_mkdir_stripe(inode, arg));
 482         case IOC_MDC_FINISH_GNS:
 483                 RETURN(ll_finish_gns(sbi));
 484         case LL_IOC_LOV_SETSTRIPE: {
 485                 struct ptlrpc_request *request = NULL;
 486                 struct mdc_op_data *op_data;
 487                 struct iattr attr = { 0 };
 488                 struct lov_user_md lum, *lump = (struct lov_user_md *)arg;
 489                 int rc = 0;
 490
 491                 LASSERT(sizeof(lum) == sizeof(*lump));
 492                 LASSERT(sizeof(lum.lmm_objects[0]) ==
 493                         sizeof(lump->lmm_objects[0]));
 494                 rc = copy_from_user(&lum, lump, sizeof(lum));
 495                 if (rc)
 496                         RETURN(-EFAULT);
 497
 498                 if (lum.lmm_magic != LOV_USER_MAGIC)
 499                         RETURN(-EINVAL);
 500
 501                 OBD_ALLOC(op_data, sizeof(*op_data));
 502                 if (op_data == NULL)
 503                         RETURN(-ENOMEM);
 504
 505                 ll_prepare_mdc_data(op_data, inode, NULL, NULL, 0, 0);
 506
 507                 rc = md_setattr(sbi->ll_lmv_exp, op_data, &attr, &lum,
 508                                 sizeof(lum), NULL, 0, &request);
 509                 OBD_FREE(op_data, sizeof(*op_data));
 510                 ptlrpc_req_finished(request);
 511
 512                 if (rc) {
 513                         if (rc != -EPERM && rc != -EACCES)
 514                                 CERROR("md_setattr fails: rc = %d\n", rc);
 515                 }
 516                 RETURN(rc);
 517         }
 518         case LL_IOC_LOV_GETSTRIPE: {
 519                 struct ptlrpc_request *request = NULL;
 520                 struct lov_user_md *lump = (struct lov_user_md *)arg;
 521                 struct lov_mds_md *lmm;
 522                 struct lustre_id id;
 523                 struct mds_body *body;
 524                 __u64 valid = 0;
 525                 int rc, lmmsize;
 526
 527                 valid |= OBD_MD_FLDIREA;
 528
 529                 ll_inode2id(&id, inode);
 530                 rc = md_getattr(sbi->ll_lmv_exp, &id, valid,
 531                                 obd_size_diskmd(sbi->ll_lov_exp, NULL),
 532                                 &request);
 533                 if (rc < 0) {
 534                         CDEBUG(D_INFO, "md_getattr failed: rc = %d\n", rc);
 535                         RETURN(rc);
 536                 }
 537
 538                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof(*body));
 539                 LASSERT(body != NULL);         /* checked by md_getattr_lock */
 540                 LASSERT_REPSWABBED(request, 0);/* swabbed by md_getattr_lock */
 541
 542                 lmmsize = body->eadatasize;
 543                 if (lmmsize == 0)
 544                         GOTO(out_get, rc = -ENODATA);
 545
 546                 lmm = lustre_msg_buf(request->rq_repmsg, 1, lmmsize);
 547                 LASSERT(lmm != NULL);
 548                 LASSERT_REPSWABBED(request, 1);
 549                 rc = copy_to_user(lump, lmm, lmmsize);
 550                 if (rc)
 551                         GOTO(out_get, rc = -EFAULT);
 552
 553                 EXIT;
 554         out_get:
 555                 ptlrpc_req_finished(request);
 556                 RETURN(rc);
 557         }
 558         case IOC_MDC_SHOWFID: {
 559                 struct lustre_id *idp = (struct lustre_id *)arg;
 560                 struct lustre_id id;
 561                 char *filename;
 562                 int rc;
 563
 564                 filename = getname((const char *)arg);
 565                 if (IS_ERR(filename))
 566                         RETURN(PTR_ERR(filename));
 567
 568                 ll_inode2id(&id, inode);
 569
 570                 rc = ll_get_fid(sbi->ll_lmv_exp, &id, filename, &id);
 571                 if (rc < 0)
 572                         GOTO(out_filename, rc);
 573
 574                 rc = copy_to_user(idp, &id, sizeof(*idp));
 575                 if (rc)
 576                         GOTO(out_filename, rc = -EFAULT);
 577
 578                 EXIT;
 579         out_filename:
 580                 putname(filename);
 581                 return rc;
 582         }
 583         case IOC_MDC_GETSTRIPE: {
 584                 struct lov_user_md *lump = (struct lov_user_md *)arg;
 585                 struct ptlrpc_request *request = NULL;
 586                 struct lov_mds_md *lmm;
 587                 struct mds_body *body;
 588                 struct lustre_id id;
 589                 char *filename;
 590                 int rc, lmmsize;
 591
 592                 filename = getname((const char *)arg);
 593                 if (IS_ERR(filename))
 594                         RETURN(PTR_ERR(filename));
 595
 596                 ll_inode2id(&id, inode);
 597                 rc = md_getattr_lock(sbi->ll_lmv_exp, &id, filename,
 598                                      strlen(filename) + 1, OBD_MD_FLEASIZE,
 599                                      obd_size_diskmd(sbi->ll_lov_exp, NULL),
 600                                      &request);
 601                 if (rc < 0) {
 602                         CDEBUG(D_INFO, "md_getattr_lock failed on %s: rc %d\n",
 603                                filename, rc);
 604                         GOTO(out_name, rc);
 605                 }
 606
 607                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
 608                 LASSERT(body != NULL);         /* checked by md_getattr_lock */
 609                 LASSERT_REPSWABBED(request, 0);/* swabbed by md_getattr_lock */
 610
 611                 lmmsize = body->eadatasize;
 612
 613                 if (!(body->valid & OBD_MD_FLEASIZE) || lmmsize == 0)
 614                         GOTO(out_req, rc = -ENODATA);
 615
 616                 if (lmmsize > 4096)
 617                         GOTO(out_req, rc = -EFBIG);
 618
 619                 lmm = lustre_msg_buf(request->rq_repmsg, 1, lmmsize);
 620                 LASSERT(lmm != NULL);
 621                 LASSERT_REPSWABBED(request, 1);
 622
 623                 rc = copy_to_user(lump, lmm, lmmsize);
 624                 if (rc)
 625                         GOTO(out_req, rc = -EFAULT);
 626
 627                 EXIT;
 628         out_req:
 629                 ptlrpc_req_finished(request);
 630         out_name:
 631                 putname(filename);
 632                 return rc;
 633         }
 634         case OBD_IOC_PING: {
 635                 struct ptlrpc_request *req = NULL;
 636                 char *buf = NULL;
 637                 int rc, len=0;
 638                 struct client_obd *cli;
 639                 struct obd_device *obd;
 640
 641                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 642                 if (rc)
 643                         RETURN(rc);
 644                 data = (void *)buf;
 645
 646                 obd = class_name2obd(data->ioc_inlbuf1);
 647
 648                 if (!obd )
 649                         GOTO(out_ping, rc = -ENODEV);
 650
 651                 if (!obd->obd_attached) {
 652                         CERROR("Device %d not attached\n", obd->obd_minor);
 653                         GOTO(out_ping, rc = -ENODEV);
 654                 }
 655                 if (!obd->obd_set_up) {
 656                         CERROR("Device %d still not setup\n", obd->obd_minor);
 657                         GOTO(out_ping, rc = -ENODEV);
 658                 }
 659                 cli = &obd->u.cli;
 660                 req = ptlrpc_prep_req(cli->cl_import, LUSTRE_OBD_VERSION,
 661                                       OBD_PING, 0, NULL, NULL);
 662                 if (!req)
 663                         GOTO(out_ping, rc = -ENOMEM);
 664
 665                 req->rq_replen = lustre_msg_size(0, NULL);
 666                 req->rq_send_state = LUSTRE_IMP_FULL;
 667
 668                 rc = ptlrpc_queue_wait(req);
 669
 670                 ptlrpc_req_finished(req);
 671         out_ping:
 672                 obd_ioctl_freedata(buf, len);
 673                 return rc;
 674         }
 675         case OBD_IOC_LLOG_CATINFO: {
 676                 struct ptlrpc_request *req = NULL;
 677                 char *buf = NULL;
 678                 int rc, len = 0;
 679                 char *bufs[2], *str;
 680                 int lens[2], size;
 681
 682                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 683                 if (rc)
 684                         RETURN(rc);
 685                 data = (void *)buf;
 686
 687                 if (!data->ioc_inlbuf1) {
 688                         obd_ioctl_freedata(buf, len);
 689                         RETURN(-EINVAL);
 690                 }
 691
 692                 lens[0] = data->ioc_inllen1;
 693                 bufs[0] = data->ioc_inlbuf1;
 694                 if (data->ioc_inllen2) {
 695                         lens[1] = data->ioc_inllen2;
 696                         bufs[1] = data->ioc_inlbuf2;
 697                 } else {
 698                         lens[1] = 0;
 699                         bufs[1] = NULL;
 700                 }
 701                 size = data->ioc_plen1;
 702                 req = ptlrpc_prep_req(sbi2lmv(sbi)->cl_import,
 703                                       LUSTRE_LOG_VERSION, LLOG_CATINFO,
 704                                       2, lens, bufs);
 705                 if (!req)
 706                         GOTO(out_catinfo, rc = -ENOMEM);
 707
 708                 req->rq_replen = lustre_msg_size(1, &size);
 709
 710                 rc = ptlrpc_queue_wait(req);
 711                 str = lustre_msg_string(req->rq_repmsg, 0, data->ioc_plen1);
 712                 if (!rc)
 713                         rc = copy_to_user(data->ioc_pbuf1, str,
 714                                           data->ioc_plen1);
 715                 ptlrpc_req_finished(req);
 716         out_catinfo:
 717                 obd_ioctl_freedata(buf, len);
 718                 RETURN(rc);
 719         }
 720         default:
 721                 return obd_iocontrol(cmd, sbi->ll_lov_exp, 0,
 722                                      NULL, (void *)arg);
 723         }
 724 }
 725
 726 int ll_dir_open(struct inode *inode, struct file *file)
 727 {
 728         ENTRY;
 729         RETURN(ll_file_open(inode, file));
 730 }
 731
 732 int ll_dir_release(struct inode *inode, struct file *file)
 733 {
 734         ENTRY;
 735         RETURN(ll_file_release(inode, file));
 736 }
 737
 738 struct file_operations ll_dir_operations = {
 739         .open     = ll_dir_open,
 740         .release  = ll_dir_release,
 741         .read     = generic_read_dir,
 742         .readdir  = ll_readdir,
 743         .ioctl    = ll_dir_ioctl
 744 };
 745