lustre/lvfs/lvfs_linux.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/lvfs/lvfs_linux.c
  37  *
  38  * Author: Andreas Dilger <adilger@clusterfs.com>
  39  */
  40
  41 #ifndef EXPORT_SYMTAB
  42 # define EXPORT_SYMTAB
  43 #endif
  44
  45 #define DEBUG_SUBSYSTEM S_FILTER
  46
  47 #include <linux/version.h>
  48 #include <linux/fs.h>
  49 #include <asm/unistd.h>
  50 #include <linux/slab.h>
  51 #include <linux/pagemap.h>
  52 #include <linux/quotaops.h>
  53 #include <linux/version.h>
  54 #include <libcfs/kp30.h>
  55 #include <lustre_fsfilt.h>
  56 #include <obd.h>
  57 #include <linux/module.h>
  58 #include <linux/init.h>
  59 #include <linux/lustre_compat25.h>
  60 #include <lvfs.h>
  61 #include "lvfs_internal.h"
  62
  63 #include <obd.h>
  64 #include <lustre_lib.h>
  65 #include <lustre_quota.h>
  66
  67 /* Debugging check only needed during development */
  68 #ifdef OBD_CTXT_DEBUG
  69 # define ASSERT_CTXT_MAGIC(magic) LASSERT((magic) == OBD_RUN_CTXT_MAGIC)
  70 # define ASSERT_NOT_KERNEL_CTXT(msg) LASSERTF(!segment_eq(get_fs(), get_ds()),\
  71                                               msg)
  72 # define ASSERT_KERNEL_CTXT(msg) LASSERTF(segment_eq(get_fs(), get_ds()), msg)
  73 #else
  74 # define ASSERT_CTXT_MAGIC(magic) do {} while(0)
  75 # define ASSERT_NOT_KERNEL_CTXT(msg) do {} while(0)
  76 # define ASSERT_KERNEL_CTXT(msg) do {} while(0)
  77 #endif
  78
  79 static void push_group_info(struct lvfs_run_ctxt *save,
  80                             struct upcall_cache_entry *uce)
  81 {
  82         struct group_info *ginfo = uce ? uce->ue_group_info : NULL;
  83
  84         if (!ginfo) {
  85                 save->ngroups = current_ngroups;
  86                 current_ngroups = 0;
  87         } else {
  88 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
  89                 struct cred *cred;
  90                 task_lock(current);
  91                 save->group_info = current_cred()->group_info;
  92                 if ((cred = prepare_creds())) {
  93                         cred->group_info = ginfo;
  94                         commit_creds(cred);
  95                 }
  96                 task_unlock(current);
  97 #else
  98                 LASSERT(ginfo->ngroups <= NGROUPS);
  99                 LASSERT(current->ngroups <= NGROUPS_SMALL);
 100                 /* save old */
 101                 save->group_info.ngroups = current->ngroups;
 102                 if (current->ngroups)
 103                         memcpy(save->group_info.small_block, current->groups,
 104                                current->ngroups * sizeof(gid_t));
 105                 /* push new */
 106                 current->ngroups = ginfo->ngroups;
 107                 if (ginfo->ngroups)
 108                         memcpy(current->groups, ginfo->small_block,
 109                                current->ngroups * sizeof(gid_t));
 110 #endif
 111         }
 112 }
 113
 114 static void pop_group_info(struct lvfs_run_ctxt *save,
 115                            struct upcall_cache_entry *uce)
 116 {
 117         struct group_info *ginfo = uce ? uce->ue_group_info : NULL;
 118
 119         if (!ginfo) {
 120                 current_ngroups = save->ngroups;
 121         } else {
 122 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,4)
 123                 struct cred *cred;
 124                 task_lock(current);
 125                 if ((cred = prepare_creds())) {
 126                         cred->group_info = save->group_info;
 127                         commit_creds(cred);
 128                 }
 129                 task_unlock(current);
 130 #else
 131                 current->ngroups = save->group_info.ngroups;
 132                 if (current->ngroups)
 133                         memcpy(current->groups, save->group_info.small_block,
 134                                current->ngroups * sizeof(gid_t));
 135 #endif
 136         }
 137 }
 138
 139 /* push / pop to root of obd store */
 140 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx,
 141                struct lvfs_ucred *uc)
 142 {
 143         //ASSERT_NOT_KERNEL_CTXT("already in kernel context!\n");
 144         ASSERT_CTXT_MAGIC(new_ctx->magic);
 145         OBD_SET_CTXT_MAGIC(save);
 146
 147         /*
 148         CDEBUG(D_INFO,
 149                "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 150                save, current, current->fs, current->fs->pwd,
 151                atomic_read(&current->fs->pwd->d_count),
 152                atomic_read(&current->fs->pwd->d_inode->i_count),
 153                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 154                current->fs->pwdmnt,
 155                atomic_read(&current->fs->pwdmnt->mnt_count));
 156         */
 157
 158         save->fs = get_fs();
 159         LASSERT(atomic_read(&cfs_fs_pwd(current->fs)->d_count));
 160         LASSERT(atomic_read(&new_ctx->pwd->d_count));
 161         save->pwd = dget(cfs_fs_pwd(current->fs));
 162         save->pwdmnt = mntget(cfs_fs_mnt(current->fs));
 163         save->luc.luc_umask = current->fs->umask;
 164
 165         LASSERT(save->pwd);
 166         LASSERT(save->pwdmnt);
 167         LASSERT(new_ctx->pwd);
 168         LASSERT(new_ctx->pwdmnt);
 169
 170         if (uc) {
 171                 struct cred *cred;
 172                 save->luc.luc_fsuid = current_fsuid();
 173                 save->luc.luc_fsgid = current_fsgid();
 174                 save->luc.luc_cap = current_cap();
 175
 176                 if ((cred = prepare_creds())) {
 177                         cred->fsuid = uc->luc_fsuid;
 178                         cred->fsgid = uc->luc_fsgid;
 179                         cred->cap_effective = uc->luc_cap;
 180                         commit_creds(cred);
 181                 }
 182
 183                 push_group_info(save, uc->luc_uce);
 184         }
 185         current->fs->umask = 0; /* umask already applied on client */
 186         set_fs(new_ctx->fs);
 187         ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 188
 189         /*
 190         CDEBUG(D_INFO,
 191                "= push %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 192                new_ctx, current, current->fs, current->fs->pwd,
 193                atomic_read(&current->fs->pwd->d_count),
 194                atomic_read(&current->fs->pwd->d_inode->i_count),
 195                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 196                current->fs->pwdmnt,
 197                atomic_read(&current->fs->pwdmnt->mnt_count));
 198         */
 199 }
 200 EXPORT_SYMBOL(push_ctxt);
 201
 202 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx,
 203               struct lvfs_ucred *uc)
 204 {
 205         //printk("pc0");
 206         ASSERT_CTXT_MAGIC(saved->magic);
 207         //printk("pc1");
 208         ASSERT_KERNEL_CTXT("popping non-kernel context!\n");
 209
 210         /*
 211         CDEBUG(D_INFO,
 212                " = pop  %p==%p = cur %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 213                new_ctx, current, current->fs, current->fs->pwd,
 214                atomic_read(&current->fs->pwd->d_count),
 215                atomic_read(&current->fs->pwd->d_inode->i_count),
 216                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 217                current->fs->pwdmnt,
 218                atomic_read(&current->fs->pwdmnt->mnt_count));
 219         */
 220
 221         LASSERTF(cfs_fs_pwd(current->fs) == new_ctx->pwd, "%p != %p\n",
 222                  cfs_fs_pwd(current->fs), new_ctx->pwd);
 223         LASSERTF(cfs_fs_mnt(current->fs) == new_ctx->pwdmnt, "%p != %p\n",
 224                  cfs_fs_mnt(current->fs), new_ctx->pwdmnt);
 225
 226         set_fs(saved->fs);
 227         ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 228
 229         dput(saved->pwd);
 230         mntput(saved->pwdmnt);
 231         current->fs->umask = saved->luc.luc_umask;
 232         if (uc) {
 233                 struct cred *cred;
 234                 if ((cred = prepare_creds())) {
 235                         cred->fsuid = saved->luc.luc_fsuid;
 236                         cred->fsgid = saved->luc.luc_fsgid;
 237                         cred->cap_effective = saved->luc.luc_cap;
 238                         commit_creds(cred);
 239                 }
 240
 241                 pop_group_info(saved, uc->luc_uce);
 242         }
 243
 244         /*
 245         CDEBUG(D_INFO,
 246                "= pop  %p->%p = cur fs %p pwd %p:d%d:i%d (%.*s), pwdmnt %p:%d\n",
 247                saved, current, current->fs, current->fs->pwd,
 248                atomic_read(&current->fs->pwd->d_count),
 249                atomic_read(&current->fs->pwd->d_inode->i_count),
 250                current->fs->pwd->d_name.len, current->fs->pwd->d_name.name,
 251                current->fs->pwdmnt,
 252                atomic_read(&current->fs->pwdmnt->mnt_count));
 253         */
 254 }
 255 EXPORT_SYMBOL(pop_ctxt);
 256
 257 /* utility to make a file */
 258 struct dentry *simple_mknod(struct dentry *dir, char *name, int mode, int fix)
 259 {
 260         struct dentry *dchild;
 261         int err = 0;
 262         ENTRY;
 263
 264         ASSERT_KERNEL_CTXT("kernel doing mknod outside kernel context\n");
 265         CDEBUG(D_INODE, "creating file %.*s\n", (int)strlen(name), name);
 266
 267         dchild = ll_lookup_one_len(name, dir, strlen(name));
 268         if (IS_ERR(dchild))
 269                 GOTO(out_up, dchild);
 270
 271         if (dchild->d_inode) {
 272                 int old_mode = dchild->d_inode->i_mode;
 273                 if (!S_ISREG(old_mode))
 274                         GOTO(out_err, err = -EEXIST);
 275
 276                 /* Fixup file permissions if necessary */
 277                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 278                         CWARN("fixing permissions on %s from %o to %o\n",
 279                               name, old_mode, mode);
 280                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 281                                                   (old_mode & ~S_IALLUGO);
 282                         mark_inode_dirty(dchild->d_inode);
 283                 }
 284                 GOTO(out_up, dchild);
 285         }
 286
 287         err = ll_vfs_create(dir->d_inode, dchild, (mode & ~S_IFMT) | S_IFREG,
 288                             NULL);
 289         if (err)
 290                 GOTO(out_err, err);
 291
 292         RETURN(dchild);
 293
 294 out_err:
 295         dput(dchild);
 296         dchild = ERR_PTR(err);
 297 out_up:
 298         return dchild;
 299 }
 300 EXPORT_SYMBOL(simple_mknod);
 301
 302 /* utility to make a directory */
 303 struct dentry *simple_mkdir(struct dentry *dir, struct vfsmount *mnt,
 304                             char *name, int mode, int fix)
 305 {
 306         struct dentry *dchild;
 307         int err = 0;
 308         ENTRY;
 309
 310         ASSERT_KERNEL_CTXT("kernel doing mkdir outside kernel context\n");
 311         CDEBUG(D_INODE, "creating directory %.*s\n", (int)strlen(name), name);
 312         dchild = ll_lookup_one_len(name, dir, strlen(name));
 313         if (IS_ERR(dchild))
 314                 GOTO(out_up, dchild);
 315
 316         if (dchild->d_inode) {
 317                 int old_mode = dchild->d_inode->i_mode;
 318                 if (!S_ISDIR(old_mode)) {
 319                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 320                                dchild->d_inode->i_ino,
 321                                dchild->d_inode->i_generation, old_mode);
 322                         GOTO(out_err, err = -ENOTDIR);
 323                 }
 324
 325                 /* Fixup directory permissions if necessary */
 326                 if (fix && (old_mode & S_IALLUGO) != (mode & S_IALLUGO)) {
 327                         CDEBUG(D_CONFIG,
 328                                "fixing permissions on %s from %o to %o\n",
 329                                name, old_mode, mode);
 330                         dchild->d_inode->i_mode = (mode & S_IALLUGO) |
 331                                                   (old_mode & ~S_IALLUGO);
 332                         mark_inode_dirty(dchild->d_inode);
 333                 }
 334                 GOTO(out_up, dchild);
 335         }
 336
 337         err = ll_vfs_mkdir(dir->d_inode, dchild, mnt, mode);
 338         if (err)
 339                 GOTO(out_err, err);
 340
 341         RETURN(dchild);
 342
 343 out_err:
 344         dput(dchild);
 345         dchild = ERR_PTR(err);
 346 out_up:
 347         return dchild;
 348 }
 349 EXPORT_SYMBOL(simple_mkdir);
 350
 351 /* utility to rename a file */
 352 int lustre_rename(struct dentry *dir, struct vfsmount *mnt,
 353                   char *oldname, char *newname)
 354 {
 355         struct dentry *dchild_old, *dchild_new;
 356         int err = 0;
 357         ENTRY;
 358
 359         ASSERT_KERNEL_CTXT("kernel doing rename outside kernel context\n");
 360         CDEBUG(D_INODE, "renaming file %.*s to %.*s\n",
 361                (int)strlen(oldname), oldname, (int)strlen(newname), newname);
 362
 363         dchild_old = ll_lookup_one_len(oldname, dir, strlen(oldname));
 364         if (IS_ERR(dchild_old))
 365                 RETURN(PTR_ERR(dchild_old));
 366
 367         if (!dchild_old->d_inode)
 368                 GOTO(put_old, err = -ENOENT);
 369
 370         dchild_new = ll_lookup_one_len(newname, dir, strlen(newname));
 371         if (IS_ERR(dchild_new))
 372                 GOTO(put_old, err = PTR_ERR(dchild_new));
 373
 374         err = ll_vfs_rename(dir->d_inode, dchild_old, mnt,
 375                             dir->d_inode, dchild_new, mnt);
 376
 377         dput(dchild_new);
 378 put_old:
 379         dput(dchild_old);
 380         RETURN(err);
 381 }
 382 EXPORT_SYMBOL(lustre_rename);
 383
 384 /*
 385  * Read a file from within kernel context.  Prior to calling this
 386  * function we should already have done a push_ctxt().
 387  */
 388 int lustre_fread(struct file *file, void *buf, int len, loff_t *off)
 389 {
 390         ASSERT_KERNEL_CTXT("kernel doing read outside kernel context\n");
 391         if (!file || !file->f_op || !file->f_op->read || !off)
 392                 RETURN(-ENOSYS);
 393
 394         return file->f_op->read(file, buf, len, off);
 395 }
 396 EXPORT_SYMBOL(lustre_fread);
 397
 398 /*
 399  * Write a file from within kernel context.  Prior to calling this
 400  * function we should already have done a push_ctxt().
 401  */
 402 int lustre_fwrite(struct file *file, const void *buf, int len, loff_t *off)
 403 {
 404         ENTRY;
 405         ASSERT_KERNEL_CTXT("kernel doing write outside kernel context\n");
 406         if (!file)
 407                 RETURN(-ENOENT);
 408         if (!file->f_op)
 409                 RETURN(-ENOSYS);
 410         if (!off)
 411                 RETURN(-EINVAL);
 412
 413         if (!file->f_op->write)
 414                 RETURN(-EROFS);
 415
 416         RETURN(file->f_op->write(file, buf, len, off));
 417 }
 418 EXPORT_SYMBOL(lustre_fwrite);
 419
 420 /*
 421  * Sync a file from within kernel context.  Prior to calling this
 422  * function we should already have done a push_ctxt().
 423  */
 424 int lustre_fsync(struct file *file)
 425 {
 426         ENTRY;
 427         ASSERT_KERNEL_CTXT("kernel doing sync outside kernel context\n");
 428         if (!file || !file->f_op || !file->f_op->fsync)
 429                 RETURN(-ENOSYS);
 430
 431         RETURN(file->f_op->fsync(file, file->f_dentry, 0));
 432 }
 433 EXPORT_SYMBOL(lustre_fsync);
 434
 435 /* Note:  dput(dchild) will be called if there is an error */
 436 struct l_file *l_dentry_open(struct lvfs_run_ctxt *ctxt, struct l_dentry *de,
 437                              int flags)
 438 {
 439         mntget(ctxt->pwdmnt);
 440         return ll_dentry_open(de, ctxt->pwdmnt, flags, current_cred());
 441 }
 442 EXPORT_SYMBOL(l_dentry_open);
 443
 444 #ifdef HAVE_VFS_READDIR_U64_INO
 445 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 446                      u64 ino, unsigned int d_type)
 447 #else
 448 static int l_filldir(void *__buf, const char *name, int namlen, loff_t offset,
 449                      ino_t ino, unsigned int d_type)
 450 #endif
 451 {
 452         struct l_linux_dirent *dirent;
 453         struct l_readdir_callback *buf = (struct l_readdir_callback *)__buf;
 454
 455         dirent = buf->lrc_dirent;
 456         if (dirent)
 457                dirent->lld_off = offset;
 458
 459         OBD_ALLOC(dirent, sizeof(*dirent));
 460
 461         if (!dirent)
 462                 return -ENOMEM;
 463
 464         list_add_tail(&dirent->lld_list, buf->lrc_list);
 465
 466         buf->lrc_dirent = dirent;
 467         dirent->lld_ino = ino;
 468         LASSERT(sizeof(dirent->lld_name) >= namlen + 1);
 469         memcpy(dirent->lld_name, name, namlen);
 470
 471         return 0;
 472 }
 473
 474 long l_readdir(struct file *file, struct list_head *dentry_list)
 475 {
 476         struct l_linux_dirent *lastdirent;
 477         struct l_readdir_callback buf;
 478         int error;
 479
 480         buf.lrc_dirent = NULL;
 481         buf.lrc_list = dentry_list;
 482
 483         error = vfs_readdir(file, l_filldir, &buf);
 484         if (error < 0)
 485                 return error;
 486
 487         lastdirent = buf.lrc_dirent;
 488         if (lastdirent)
 489                 lastdirent->lld_off = file->f_pos;
 490
 491         return 0;
 492 }
 493 EXPORT_SYMBOL(l_readdir);
 494
 495 int l_notify_change(struct vfsmount *mnt, struct dentry *dchild,
 496                     struct iattr *newattrs)
 497 {
 498         int rc;
 499
 500         LOCK_INODE_MUTEX(dchild->d_inode);
 501 #ifdef HAVE_SECURITY_PLUG
 502         rc = notify_change(dchild, mnt, newattrs);
 503 #else
 504         rc = notify_change(dchild, newattrs);
 505 #endif
 506         UNLOCK_INODE_MUTEX(dchild->d_inode);
 507         return rc;
 508 }
 509 EXPORT_SYMBOL(l_notify_change);
 510
 511 /* utility to truncate a file */
 512 int simple_truncate(struct dentry *dir, struct vfsmount *mnt,
 513                     char *name, loff_t length)
 514 {
 515         struct dentry *dchild;
 516         struct iattr newattrs;
 517         int err = 0;
 518         ENTRY;
 519
 520         CDEBUG(D_INODE, "truncating file %.*s to %lld\n", (int)strlen(name),
 521                name, (long long)length);
 522         dchild = ll_lookup_one_len(name, dir, strlen(name));
 523         if (IS_ERR(dchild))
 524                 GOTO(out, err = PTR_ERR(dchild));
 525
 526         if (dchild->d_inode) {
 527                 int old_mode = dchild->d_inode->i_mode;
 528                 if (S_ISDIR(old_mode)) {
 529                         CERROR("found %s (%lu/%u) is mode %o\n", name,
 530                                dchild->d_inode->i_ino,
 531                                dchild->d_inode->i_generation, old_mode);
 532                         GOTO(out_dput, err = -EISDIR);
 533                 }
 534
 535                 newattrs.ia_size = length;
 536                 newattrs.ia_valid = ATTR_SIZE;
 537                 err = l_notify_change(mnt, dchild, &newattrs);
 538         }
 539         EXIT;
 540 out_dput:
 541         dput(dchild);
 542 out:
 543         return err;
 544 }
 545 EXPORT_SYMBOL(simple_truncate);
 546
 547 #ifdef LUSTRE_KERNEL_VERSION
 548 #ifndef HAVE_CLEAR_RDONLY_ON_PUT
 549 #error rdonly patchset must be updated [cfs bz11248]
 550 #endif
 551
 552 void dev_set_rdonly(lvfs_sbdev_type dev);
 553 int dev_check_rdonly(lvfs_sbdev_type dev);
 554
 555 void __lvfs_set_rdonly(lvfs_sbdev_type dev, lvfs_sbdev_type jdev)
 556 {
 557         lvfs_sbdev_sync(dev);
 558         if (jdev && (jdev != dev)) {
 559                 CDEBUG(D_IOCTL | D_HA, "set journal dev %lx rdonly\n",
 560                        (long)jdev);
 561                 dev_set_rdonly(jdev);
 562         }
 563         CDEBUG(D_IOCTL | D_HA, "set dev %lx rdonly\n", (long)dev);
 564         dev_set_rdonly(dev);
 565 }
 566
 567 int lvfs_check_rdonly(lvfs_sbdev_type dev)
 568 {
 569         return dev_check_rdonly(dev);
 570 }
 571
 572 EXPORT_SYMBOL(__lvfs_set_rdonly);
 573 EXPORT_SYMBOL(lvfs_check_rdonly);
 574 #endif /* LUSTRE_KERNEL_VERSION */
 575
 576 int lvfs_check_io_health(struct obd_device *obd, struct file *file)
 577 {
 578         char *write_page = NULL;
 579         loff_t offset = 0;
 580         int rc = 0;
 581         ENTRY;
 582
 583         OBD_ALLOC(write_page, CFS_PAGE_SIZE);
 584         if (!write_page)
 585                 RETURN(-ENOMEM);
 586
 587         rc = fsfilt_write_record(obd, file, write_page, CFS_PAGE_SIZE, &offset, 1);
 588
 589         OBD_FREE(write_page, CFS_PAGE_SIZE);
 590
 591         CDEBUG(D_INFO, "write 1 page synchronously for checking io rc %d\n",rc);
 592         RETURN(rc);
 593 }
 594 EXPORT_SYMBOL(lvfs_check_io_health);
 595
 596 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
 597 MODULE_DESCRIPTION("Lustre VFS Filesystem Helper v0.1");
 598 MODULE_LICENSE("GPL");