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_md_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_md_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_md_exp, &li->lli_id);
 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 = ll_intent_alloc(&it);
 236                 if (rc)
 237                         return ERR_PTR(rc);
 238
 239                 rc = md_enqueue(ll_i2sbi(dir)->ll_md_exp, LDLM_IBITS, &it,
 240                                 LCK_PR, op_data, &lockh, NULL, 0,
 241                                 ldlm_completion_ast, ll_mdc_blocking_ast, dir);
 242                 OBD_FREE(op_data, sizeof(*op_data));
 243
 244                 request = (struct ptlrpc_request *)LUSTRE_IT(&it)->it_data;
 245                 ll_intent_free(&it);
 246
 247                 if (request)
 248                         ptlrpc_req_finished(request);
 249                 if (rc < 0) {
 250                         CERROR("lock enqueue: rc: %d\n", rc);
 251                         return ERR_PTR(rc);
 252                 }
 253         }
 254         ldlm_lock_dump_handle(D_OTHER, &lockh);
 255
 256         page = read_cache_page(mapping, n,
 257                                (filler_t*)mapping->a_ops->readpage, NULL);
 258         if (!IS_ERR(page)) {
 259                 wait_on_page(page);
 260                 (void)kmap(page);
 261                 if (!PageUptodate(page))
 262                         goto fail;
 263                 if (!PageChecked(page))
 264                         ext2_check_page(page);
 265                 if (PageError(page))
 266                         goto fail;
 267         }
 268
 269 out_unlock:
 270         ldlm_lock_decref(&lockh, LCK_PR);
 271         return page;
 272
 273 fail:
 274         ext2_put_page(page);
 275         page = ERR_PTR(-EIO);
 276         goto out_unlock;
 277 }
 278
 279 /*
 280  * p is at least 6 bytes before the end of page
 281  */
 282 static inline ext2_dirent *ext2_next_entry(ext2_dirent *p)
 283 {
 284         return (ext2_dirent *)((char*)p + le16_to_cpu(p->rec_len));
 285 }
 286
 287 static inline unsigned
 288 ext2_validate_entry(char *base, unsigned offset, unsigned mask)
 289 {
 290         ext2_dirent *de = (ext2_dirent*)(base + offset);
 291         ext2_dirent *p = (ext2_dirent*)(base + (offset&mask));
 292         while ((char*)p < (char*)de)
 293                 p = ext2_next_entry(p);
 294         return (char *)p - base;
 295 }
 296
 297 static unsigned char ext2_filetype_table[EXT2_FT_MAX] = {
 298         [EXT2_FT_UNKNOWN]       DT_UNKNOWN,
 299         [EXT2_FT_REG_FILE]      DT_REG,
 300         [EXT2_FT_DIR]           DT_DIR,
 301         [EXT2_FT_CHRDEV]        DT_CHR,
 302         [EXT2_FT_BLKDEV]        DT_BLK,
 303         [EXT2_FT_FIFO]          DT_FIFO,
 304         [EXT2_FT_SOCK]          DT_SOCK,
 305         [EXT2_FT_SYMLINK]       DT_LNK,
 306 };
 307
 308
 309 int ll_readdir(struct file * filp, void * dirent, filldir_t filldir)
 310 {
 311         struct inode *inode = filp->f_dentry->d_inode;
 312         loff_t pos = filp->f_pos;
 313         // XXX struct super_block *sb = inode->i_sb;
 314         unsigned offset = pos & ~PAGE_CACHE_MASK;
 315         unsigned long n = pos >> PAGE_CACHE_SHIFT;
 316         unsigned long npages = dir_pages(inode);
 317         unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
 318         unsigned char *types = ext2_filetype_table;
 319         int need_revalidate = (filp->f_version != inode->i_version);
 320         int rc = 0;
 321         ENTRY;
 322
 323         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p) pos %llu/%llu\n",
 324                inode->i_ino, inode->i_generation, inode, pos, inode->i_size);
 325
 326         if (pos > inode->i_size - EXT2_DIR_REC_LEN(1))
 327                 RETURN(0);
 328
 329         for ( ; n < npages; n++, offset = 0) {
 330                 char *kaddr, *limit;
 331                 ext2_dirent *de;
 332                 struct page *page;
 333
 334                 CDEBUG(D_EXT2,"read %lu of dir %lu/%u page %lu/%lu size %llu\n",
 335                        PAGE_CACHE_SIZE, inode->i_ino, inode->i_generation,
 336                        n, npages, inode->i_size);
 337                 page = ll_get_dir_page(inode, n);
 338
 339                 /* size might have been updated by md_readpage() */
 340                 npages = dir_pages(inode);
 341
 342                 if (IS_ERR(page)) {
 343                         rc = PTR_ERR(page);
 344                         CERROR("error reading dir %lu/%u page %lu: rc %d\n",
 345                                inode->i_ino, inode->i_generation, n, rc);
 346                         continue;
 347                 }
 348
 349                 kaddr = page_address(page);
 350                 if (need_revalidate) {
 351                         offset = ext2_validate_entry(kaddr, offset, chunk_mask);
 352                         need_revalidate = 0;
 353                 }
 354                 de = (ext2_dirent *)(kaddr+offset);
 355                 limit = kaddr + PAGE_CACHE_SIZE - EXT2_DIR_REC_LEN(1);
 356                 for ( ;(char*)de <= limit; de = ext2_next_entry(de)) {
 357                         if (de->inode) {
 358                                 int over;
 359
 360                                 rc = 0; /* no error if we return something */
 361
 362                                 offset = (char *)de - kaddr;
 363                                 over = filldir(dirent, de->name, de->name_len,
 364                                                (n<<PAGE_CACHE_SHIFT) | offset,
 365                                                le32_to_cpu(de->inode),
 366                                                types[de->file_type &
 367                                                      (EXT2_FT_MAX - 1)]);
 368
 369                                 if (over) {
 370                                         ext2_put_page(page);
 371                                         GOTO(done, rc);
 372                                 }
 373                         }
 374                 }
 375                 ext2_put_page(page);
 376         }
 377
 378         EXIT;
 379 done:
 380         filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
 381         filp->f_version = inode->i_version;
 382         update_atime(inode);
 383         return rc;
 384 }
 385
 386 static int ll_mkdir_stripe(struct inode *inode, unsigned long arg)
 387 {
 388         struct ptlrpc_request *request = NULL;
 389         struct ll_sb_info *sbi = ll_i2sbi(inode);
 390         struct ll_user_mkdir_stripe lums;
 391         struct mdc_op_data *op_data;
 392         u16 nstripes;
 393         mode_t mode;
 394         char *name;
 395         int err = 0;
 396         ENTRY;
 397
 398         if (copy_from_user(&lums, (void *)arg, sizeof(lums)))
 399                 RETURN(-EFAULT);
 400
 401         if (lums.lums_namelen <= 0)
 402                 RETURN(-EINVAL);
 403         OBD_ALLOC(name, lums.lums_namelen);
 404         if (!name)
 405                 RETURN(-ENOMEM);
 406
 407         if (copy_from_user(name, lums.lums_name, lums.lums_namelen))
 408                 GOTO(out, err = -EFAULT);
 409
 410         CDEBUG(D_VFSTRACE, "ioctl Op:name=%s,dir=%lu/%u(%p)\n",
 411                name, inode->i_ino, inode->i_generation, inode);
 412         nstripes = lums.lums_nstripes;
 413
 414         mode = lums.lums_mode;
 415         mode = (mode & (S_IRWXUGO|S_ISVTX) & ~current->fs->umask) | S_IFDIR;
 416
 417         OBD_ALLOC(op_data, sizeof(*op_data));
 418         if (op_data == NULL)
 419                 GOTO(out, err = -ENOMEM);
 420         ll_prepare_mdc_data(op_data, inode, NULL, name,lums.lums_namelen,0);
 421         err = md_create(sbi->ll_md_exp, op_data, &nstripes, sizeof(nstripes),
 422                         mode, current->fsuid, current->fsgid, 0, &request);
 423         OBD_FREE(op_data, sizeof(*op_data));
 424         ptlrpc_req_finished(request);
 425         EXIT;
 426 out:
 427         OBD_FREE(name, lums.lums_namelen);
 428         return err;
 429 }
 430
 431 static int ll_dir_ioctl(struct inode *inode, struct file *file,
 432                         unsigned int cmd, unsigned long arg)
 433 {
 434         struct ll_sb_info *sbi = ll_i2sbi(inode);
 435         struct obd_ioctl_data *data;
 436         ENTRY;
 437
 438         CDEBUG(D_VFSTRACE, "VFS Op:inode=%lu/%u(%p), cmd=%#x\n",
 439                inode->i_ino, inode->i_generation, inode, cmd);
 440
 441         if (_IOC_TYPE(cmd) == 'T') /* tty ioctls */
 442                 return -ENOTTY;
 443
 444         lprocfs_counter_incr(ll_i2sbi(inode)->ll_stats, LPROC_LL_IOCTL);
 445         switch(cmd) {
 446         case EXT3_IOC_GETFLAGS:
 447         case EXT3_IOC_SETFLAGS:
 448                 RETURN(ll_iocontrol(inode, file, cmd, arg));
 449         case IOC_MDC_LOOKUP: {
 450                 struct ptlrpc_request *request = NULL;
 451                 struct lustre_id id;
 452                 char *buf = NULL;
 453                 char *filename;
 454                 int namelen, rc, len = 0;
 455                 __u64 valid;
 456
 457                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 458                 if (rc)
 459                         RETURN(rc);
 460                 data = (void *)buf;
 461
 462                 filename = data->ioc_inlbuf1;
 463                 namelen = data->ioc_inllen1;
 464
 465                 if (namelen < 1) {
 466                         CDEBUG(D_INFO, "IOC_MDC_LOOKUP missing filename\n");
 467                         GOTO(out, rc = -EINVAL);
 468                 }
 469
 470                 valid = OBD_MD_FLID;
 471                 ll_inode2id(&id, inode);
 472                 rc = md_getattr_lock(sbi->ll_md_exp, &id,
 473                                      filename, namelen, valid, 0, &request);
 474                 if (rc < 0) {
 475                         CDEBUG(D_INFO, "md_getattr_lock: %d\n", rc);
 476                         GOTO(out, rc);
 477                 }
 478
 479                 ptlrpc_req_finished(request);
 480
 481                 EXIT;
 482         out:
 483                 obd_ioctl_freedata(buf, len);
 484                 return rc;
 485         }
 486         case LL_IOC_MDC_MKDIRSTRIPE:
 487                 RETURN(ll_mkdir_stripe(inode, arg));
 488         case LL_IOC_LOV_SETSTRIPE: {
 489                 struct ptlrpc_request *request = NULL;
 490                 struct mdc_op_data *op_data;
 491                 struct iattr attr = { 0 };
 492                 struct lov_user_md lum, *lump = (struct lov_user_md *)arg;
 493                 int rc = 0;
 494
 495                 LASSERT(sizeof(lum) == sizeof(*lump));
 496                 LASSERT(sizeof(lum.lmm_objects[0]) ==
 497                         sizeof(lump->lmm_objects[0]));
 498                 rc = copy_from_user(&lum, lump, sizeof(lum));
 499                 if (rc)
 500                         RETURN(-EFAULT);
 501
 502                 if (lum.lmm_magic != LOV_USER_MAGIC)
 503                         RETURN(-EINVAL);
 504
 505                 OBD_ALLOC(op_data, sizeof(*op_data));
 506                 if (op_data == NULL)
 507                         RETURN(-ENOMEM);
 508
 509                 ll_prepare_mdc_data(op_data, inode, NULL, NULL, 0, 0);
 510
 511                 rc = md_setattr(sbi->ll_md_exp, op_data, &attr, &lum,
 512                                 sizeof(lum), NULL, 0, &request);
 513                 OBD_FREE(op_data, sizeof(*op_data));
 514                 ptlrpc_req_finished(request);
 515
 516                 if (rc) {
 517                         if (rc != -EPERM && rc != -EACCES)
 518                                 CERROR("md_setattr fails: rc = %d\n", rc);
 519                 }
 520                 RETURN(rc);
 521         }
 522         case LL_IOC_LOV_GETSTRIPE: {
 523                 struct ptlrpc_request *request = NULL;
 524                 struct lov_user_md *lump = (struct lov_user_md *)arg;
 525                 struct lov_mds_md *lmm;
 526                 struct lustre_id id;
 527                 struct mds_body *body;
 528                 __u64 valid = 0;
 529                 int rc, lmmsize;
 530
 531                 valid |= OBD_MD_FLDIREA;
 532
 533                 ll_inode2id(&id, inode);
 534                 rc = md_getattr(sbi->ll_md_exp, &id, valid, NULL, 0,
 535                                 obd_size_diskmd(sbi->ll_dt_exp, NULL),
 536                                 &request);
 537                 if (rc < 0) {
 538                         CDEBUG(D_INFO, "md_getattr failed: rc = %d\n", rc);
 539                         RETURN(rc);
 540                 }
 541
 542                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof(*body));
 543                 LASSERT(body != NULL);         /* checked by md_getattr_lock */
 544                 LASSERT_REPSWABBED(request, 0);/* swabbed by md_getattr_lock */
 545
 546                 lmmsize = body->eadatasize;
 547                 if (lmmsize == 0)
 548                         GOTO(out_get, rc = -ENODATA);
 549
 550                 lmm = lustre_msg_buf(request->rq_repmsg, 1, lmmsize);
 551                 LASSERT(lmm != NULL);
 552                 LASSERT_REPSWABBED(request, 1);
 553                 rc = copy_to_user(lump, lmm, lmmsize);
 554                 if (rc)
 555                         GOTO(out_get, rc = -EFAULT);
 556
 557                 EXIT;
 558         out_get:
 559                 ptlrpc_req_finished(request);
 560                 RETURN(rc);
 561         }
 562         case IOC_MDC_SHOWFID: {
 563                 struct lustre_id *idp = (struct lustre_id *)arg;
 564                 struct lustre_id id;
 565                 char *filename;
 566                 int rc;
 567
 568                 filename = getname((const char *)arg);
 569                 if (IS_ERR(filename))
 570                         RETURN(PTR_ERR(filename));
 571
 572                 ll_inode2id(&id, inode);
 573
 574                 rc = ll_get_fid(sbi->ll_md_exp, &id, filename, &id);
 575                 if (rc < 0)
 576                         GOTO(out_filename, rc);
 577
 578                 rc = copy_to_user(idp, &id, sizeof(*idp));
 579                 if (rc)
 580                         GOTO(out_filename, rc = -EFAULT);
 581
 582                 EXIT;
 583         out_filename:
 584                 putname(filename);
 585                 return rc;
 586         }
 587         case IOC_MDC_GETSTRIPE: {
 588                 struct lov_user_md *lump = (struct lov_user_md *)arg;
 589                 struct ptlrpc_request *request = NULL;
 590                 struct lov_mds_md *lmm;
 591                 struct mds_body *body;
 592                 struct lustre_id id;
 593                 char *filename;
 594                 int rc, lmmsize;
 595
 596                 filename = getname((const char *)arg);
 597                 if (IS_ERR(filename))
 598                         RETURN(PTR_ERR(filename));
 599
 600                 ll_inode2id(&id, inode);
 601                 rc = md_getattr_lock(sbi->ll_md_exp, &id, filename,
 602                                      strlen(filename) + 1, OBD_MD_FLEASIZE,
 603                                      obd_size_diskmd(sbi->ll_dt_exp, NULL),
 604                                      &request);
 605                 if (rc < 0) {
 606                         CDEBUG(D_INFO, "md_getattr_lock failed on %s: rc %d\n",
 607                                filename, rc);
 608                         GOTO(out_name, rc);
 609                 }
 610
 611                 body = lustre_msg_buf(request->rq_repmsg, 0, sizeof (*body));
 612                 LASSERT(body != NULL);         /* checked by md_getattr_lock */
 613                 LASSERT_REPSWABBED(request, 0);/* swabbed by md_getattr_lock */
 614
 615                 lmmsize = body->eadatasize;
 616
 617                 if (!(body->valid & OBD_MD_FLEASIZE) || lmmsize == 0)
 618                         GOTO(out_req, rc = -ENODATA);
 619
 620                 if (lmmsize > 4096)
 621                         GOTO(out_req, rc = -EFBIG);
 622
 623                 lmm = lustre_msg_buf(request->rq_repmsg, 1, lmmsize);
 624                 LASSERT(lmm != NULL);
 625                 LASSERT_REPSWABBED(request, 1);
 626
 627                 rc = copy_to_user(lump, lmm, lmmsize);
 628                 if (rc)
 629                         GOTO(out_req, rc = -EFAULT);
 630
 631                 EXIT;
 632         out_req:
 633                 ptlrpc_req_finished(request);
 634         out_name:
 635                 putname(filename);
 636                 return rc;
 637         }
 638         case OBD_IOC_PING: {
 639                 struct ptlrpc_request *req = NULL;
 640                 char *buf = NULL;
 641                 int rc, len=0;
 642                 struct client_obd *cli;
 643                 struct obd_device *obd;
 644
 645                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 646                 if (rc)
 647                         RETURN(rc);
 648                 data = (void *)buf;
 649
 650                 obd = class_name2obd(data->ioc_inlbuf1);
 651
 652                 if (!obd )
 653                         GOTO(out_ping, rc = -ENODEV);
 654
 655                 if (!obd->obd_attached) {
 656                         CERROR("Device %d not attached\n", obd->obd_minor);
 657                         GOTO(out_ping, rc = -ENODEV);
 658                 }
 659                 if (!obd->obd_set_up) {
 660                         CERROR("Device %d still not setup\n", obd->obd_minor);
 661                         GOTO(out_ping, rc = -ENODEV);
 662                 }
 663                 cli = &obd->u.cli;
 664                 req = ptlrpc_prep_req(cli->cl_import, LUSTRE_OBD_VERSION,
 665                                       OBD_PING, 0, NULL, NULL);
 666                 if (!req)
 667                         GOTO(out_ping, rc = -ENOMEM);
 668
 669                 req->rq_replen = lustre_msg_size(0, NULL);
 670                 req->rq_send_state = LUSTRE_IMP_FULL;
 671
 672                 rc = ptlrpc_queue_wait(req);
 673
 674                 ptlrpc_req_finished(req);
 675         out_ping:
 676                 obd_ioctl_freedata(buf, len);
 677                 return rc;
 678         }
 679         case OBD_IOC_LLOG_CATINFO: {
 680                 struct ptlrpc_request *req = NULL;
 681                 char *buf = NULL;
 682                 int rc, len = 0;
 683                 char *bufs[2], *str;
 684                 int lens[2], size;
 685
 686                 rc = obd_ioctl_getdata(&buf, &len, (void *)arg);
 687                 if (rc)
 688                         RETURN(rc);
 689                 data = (void *)buf;
 690
 691                 if (!data->ioc_inlbuf1) {
 692                         obd_ioctl_freedata(buf, len);
 693                         RETURN(-EINVAL);
 694                 }
 695
 696                 lens[0] = data->ioc_inllen1;
 697                 bufs[0] = data->ioc_inlbuf1;
 698                 if (data->ioc_inllen2) {
 699                         lens[1] = data->ioc_inllen2;
 700                         bufs[1] = data->ioc_inlbuf2;
 701                 } else {
 702                         lens[1] = 0;
 703                         bufs[1] = NULL;
 704                 }
 705                 size = data->ioc_plen1;
 706                 req = ptlrpc_prep_req(sbi2md(sbi)->cl_import,
 707                                       LUSTRE_LOG_VERSION, LLOG_CATINFO,
 708                                       2, lens, bufs);
 709                 if (!req)
 710                         GOTO(out_catinfo, rc = -ENOMEM);
 711
 712                 req->rq_replen = lustre_msg_size(1, &size);
 713
 714                 rc = ptlrpc_queue_wait(req);
 715                 str = lustre_msg_string(req->rq_repmsg, 0, data->ioc_plen1);
 716                 if (!rc)
 717                         rc = copy_to_user(data->ioc_pbuf1, str,
 718                                           data->ioc_plen1);
 719                 ptlrpc_req_finished(req);
 720         out_catinfo:
 721                 obd_ioctl_freedata(buf, len);
 722                 RETURN(rc);
 723         }
 724         default:
 725                 return obd_iocontrol(cmd, sbi->ll_dt_exp, 0,
 726                                      NULL, (void *)arg);
 727         }
 728 }
 729
 730 int ll_dir_open(struct inode *inode, struct file *file)
 731 {
 732         ENTRY;
 733         RETURN(ll_file_open(inode, file));
 734 }
 735
 736 int ll_dir_release(struct inode *inode, struct file *file)
 737 {
 738         ENTRY;
 739         RETURN(ll_file_release(inode, file));
 740 }
 741
 742 struct file_operations ll_dir_operations = {
 743         .open     = ll_dir_open,
 744         .release  = ll_dir_release,
 745         .read     = generic_read_dir,
 746         .readdir  = ll_readdir,
 747         .ioctl    = ll_dir_ioctl
 748 };
 749