lustre/lvfs/fsfilt_smfs.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  lustre/lib/fsfilt_smfs.c
   5  *  Lustre filesystem abstraction routines
   6  *
   7  *  Copyright (C) 2004 Cluster File Systems, Inc.
   8  *   Author: Wang Di <wangdi@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org.
  11  *
  12  *   Lustre is free software; you can redistribute it and/or
  13  *   modify it under the terms of version 2 of the GNU General Public
  14  *   License as published by the Free Software Foundation.
  15  *
  16  *   Lustre is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with Lustre; if not, write to the Free Software
  23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_FILTER
  27
  28 #include <linux/fs.h>
  29 #include <linux/jbd.h>
  30 #include <linux/slab.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/quotaops.h>
  33 #include <linux/version.h>
  34 #include <linux/kp30.h>
  35 #include <linux/lustre_fsfilt.h>
  36 #include <linux/lustre_smfs.h>
  37 #include <linux/obd.h>
  38 #include <linux/obd_class.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41
  42 #include <linux/lustre_snap.h>
  43 #include <linux/lustre_smfs.h>
  44 static void *fsfilt_smfs_start(struct inode *inode, int op,
  45                                void *desc_private, int logs)
  46 {
  47         void *handle;
  48         struct inode *cache_inode = I2CI(inode);
  49         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
  50
  51         if (cache_fsfilt == NULL)
  52                 return NULL;
  53
  54         SMFS_TRANS_OP(inode, op);
  55
  56         if (!cache_fsfilt->fs_start)
  57                 return ERR_PTR(-ENOSYS);
  58
  59         handle = cache_fsfilt->fs_start(cache_inode, op, desc_private, logs);
  60         return handle;
  61 }
  62
  63 static void *fsfilt_smfs_brw_start(int objcount, struct fsfilt_objinfo *fso,
  64                                    int niocount, struct niobuf_local *nb,
  65                                    void *desc_private, int logs)
  66 {
  67         struct fsfilt_operations *cache_fsfilt;
  68         struct dentry *cache_dentry = NULL;
  69         struct inode *cache_inode = NULL;
  70         struct fsfilt_objinfo cache_fso;
  71         void   *rc = NULL;
  72
  73         ENTRY;
  74         cache_fsfilt = I2FOPS(fso->fso_dentry->d_inode);
  75         if (cache_fsfilt == NULL)
  76                 return NULL;
  77
  78         cache_inode = I2CI(fso->fso_dentry->d_inode);
  79          cache_dentry = pre_smfs_dentry(NULL, cache_inode, fso->fso_dentry);
  80
  81         if (!cache_dentry)
  82                 GOTO(exit, rc = ERR_PTR(-ENOMEM));
  83
  84         cache_fso.fso_dentry = cache_dentry;
  85         cache_fso.fso_bufcnt = fso->fso_bufcnt;
  86
  87         if (!cache_fsfilt->fs_brw_start)
  88                 return ERR_PTR(-ENOSYS);
  89
  90         rc = cache_fsfilt->fs_brw_start(objcount, &cache_fso, niocount, nb,
  91                                         desc_private, logs);
  92 exit:
  93         post_smfs_dentry(cache_dentry);
  94         return rc;
  95 }
  96
  97 /* FIXME-WANGDI: here we can easily have inode == NULL due to
  98    mds_open() behavior. It passes NULL inode to mds_finish_transno()
  99    sometimes. Probably we should have spare way to get cache fsfilt
 100    operations. */
 101 static int fsfilt_smfs_commit(struct super_block *sb, struct inode *inode,
 102                               void *h, int force_sync)
 103 {
 104         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 105         struct super_block *csb = S2CSB(sb);
 106         struct inode *cache_inode = NULL;
 107         int    rc = -EIO;
 108
 109         if (inode)
 110                 cache_inode = I2CI(inode);
 111
 112         if (cache_fsfilt == NULL)
 113                 RETURN(rc);
 114
 115         if (!cache_fsfilt->fs_commit)
 116                 RETURN(-ENOSYS);
 117
 118         rc = cache_fsfilt->fs_commit(csb, cache_inode, h, force_sync);
 119
 120         RETURN(rc);
 121 }
 122
 123 static int fsfilt_smfs_commit_async(struct inode *inode, void *h,
 124                                     void **wait_handle)
 125 {
 126         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 127         struct inode *cache_inode = NULL;
 128         int    rc = -EIO;
 129
 130         cache_inode = I2CI(inode);
 131         if (cache_fsfilt == NULL)
 132                 RETURN(-EINVAL);
 133
 134         if (!cache_fsfilt->fs_commit_async)
 135                 RETURN(-ENOSYS);
 136
 137         rc = cache_fsfilt->fs_commit_async(cache_inode, h, wait_handle);
 138
 139         RETURN(rc);
 140 }
 141
 142 static int fsfilt_smfs_commit_wait(struct inode *inode, void *h)
 143 {
 144         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 145         struct inode *cache_inode = NULL;
 146         int    rc = -EIO;
 147
 148         cache_inode = I2CI(inode);
 149         if (cache_fsfilt == NULL)
 150                 RETURN(-EINVAL);
 151
 152         if (!cache_fsfilt->fs_commit_wait)
 153                 RETURN(-ENOSYS);
 154
 155         rc = cache_fsfilt->fs_commit_wait(cache_inode, h);
 156
 157         RETURN(rc);
 158 }
 159
 160 static int fsfilt_smfs_setattr(struct dentry *dentry, void *handle,
 161                                struct iattr *iattr, int do_trunc)
 162 {
 163         struct fsfilt_operations *cache_fsfilt = I2FOPS(dentry->d_inode);
 164         struct dentry *cache_dentry = NULL;
 165         struct inode *cache_inode = NULL;
 166         int    rc = -EIO;
 167
 168         if (!cache_fsfilt)
 169                 RETURN(rc);
 170
 171         cache_inode = I2CI(dentry->d_inode);
 172
 173         cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
 174         if (!cache_dentry)
 175                 GOTO(exit, rc = -ENOMEM);
 176
 177         pre_smfs_inode(dentry->d_inode, cache_inode);
 178
 179         if (!cache_fsfilt->fs_setattr)
 180                 RETURN(-ENOSYS);
 181
 182         rc = cache_fsfilt->fs_setattr(cache_dentry, handle, iattr, do_trunc);
 183
 184         post_smfs_inode(dentry->d_inode, cache_inode);
 185
 186         if (rc == 0) {
 187                 struct super_block *sb = dentry->d_inode->i_sb;
 188
 189                 if (SMFS_DO_REC(S2SMI(sb)) &&
 190                     SMFS_DO_INODE_REC(dentry->d_inode)) {
 191                         rc = smfs_rec_setattr(dentry->d_inode, dentry, iattr);
 192                 }
 193         }
 194 exit:
 195         post_smfs_dentry(cache_dentry);
 196         RETURN(rc);
 197 }
 198
 199 static int fsfilt_smfs_iocontrol(struct inode *inode, struct file *file,
 200                                  unsigned int cmd, unsigned long arg)
 201 {
 202         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 203         struct inode *cache_inode = NULL;
 204         struct smfs_file_info *sfi = NULL;
 205         int    rc = -EIO;
 206         ENTRY;
 207
 208         if (!cache_fsfilt)
 209                 RETURN(rc);
 210
 211         cache_inode = I2CI(inode);
 212
 213         if (!cache_inode)
 214                 RETURN(rc);
 215
 216         if (file != NULL) {
 217                 sfi = F2SMFI(file);
 218
 219                 if (sfi->magic != SMFS_FILE_MAGIC)
 220                         BUG();
 221         } else {
 222                 sfi = NULL;
 223         }
 224
 225         if (!cache_fsfilt->fs_iocontrol)
 226                 RETURN(-ENOSYS);
 227
 228         if (sfi) {
 229                 rc = cache_fsfilt->fs_iocontrol(cache_inode, sfi->c_file, cmd,
 230                                                 arg);
 231         } else {
 232                 rc = cache_fsfilt->fs_iocontrol(cache_inode, NULL, cmd, arg);
 233         }
 234
 235         /* FIXME-UMKA: Should this be in duplicate_inode()? */
 236         if (rc == 0 && cmd == EXT3_IOC_SETFLAGS)
 237                 inode->i_flags = cache_inode->i_flags;
 238
 239         post_smfs_inode(inode, cache_inode);
 240
 241         RETURN(rc);
 242 }
 243
 244 static int fsfilt_smfs_set_md(struct inode *inode, void *handle,
 245                               void *lmm, int lmm_size)
 246 {
 247         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 248         struct inode *cache_inode = NULL;
 249         int    rc = -EIO;
 250
 251         if (!cache_fsfilt)
 252                 RETURN(-EINVAL);
 253
 254         cache_inode = I2CI(inode);
 255
 256         if (!cache_inode)
 257                 RETURN(-ENOENT);
 258
 259         pre_smfs_inode(inode, cache_inode);
 260
 261         if (!cache_fsfilt->fs_set_md)
 262                 RETURN(-ENOSYS);
 263
 264         down(&cache_inode->i_sem);
 265         rc = cache_fsfilt->fs_set_md(cache_inode, handle, lmm, lmm_size);
 266         up(&cache_inode->i_sem);
 267
 268         post_smfs_inode(inode, cache_inode);
 269
 270         smfs_rec_md(inode, lmm, lmm_size);
 271
 272         RETURN(rc);
 273 }
 274
 275 /* Must be called with i_sem held */
 276 static int fsfilt_smfs_get_md(struct inode *inode, void *lmm, int lmm_size)
 277 {
 278         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 279         struct inode *cache_inode = NULL;
 280         int    rc = -EIO;
 281
 282         if (!cache_fsfilt)
 283                 RETURN(-EINVAL);
 284
 285         cache_inode = I2CI(inode);
 286
 287         if (!cache_inode)
 288                 RETURN(-ENOENT);
 289
 290         pre_smfs_inode(inode, cache_inode);
 291
 292         if (!cache_fsfilt->fs_get_md)
 293                 RETURN(-ENOSYS);
 294
 295         down(&cache_inode->i_sem);
 296         rc = cache_fsfilt->fs_get_md(cache_inode, lmm, lmm_size);
 297         up(&cache_inode->i_sem);
 298
 299         post_smfs_inode(inode, cache_inode);
 300
 301         RETURN(rc);
 302 }
 303
 304 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
 305 static int fsfilt_smfs_send_bio(struct inode *inode, struct bio *bio)
 306 #else
 307 static int fsfilt_smfs_send_bio(struct inode *inode, struct kiobuf *bio)
 308 #endif
 309 {
 310         struct inode *cache_inode;
 311         struct fsfilt_operations *cache_fsfilt;
 312
 313         cache_fsfilt = I2FOPS(inode);
 314         if (!cache_fsfilt)
 315                 RETURN(-EINVAL);
 316
 317         cache_inode = I2CI(inode);
 318         if (!cache_inode)
 319                 RETURN(-EINVAL);
 320
 321         if (!cache_fsfilt->fs_send_bio)
 322                 RETURN(-ENOSYS);
 323
 324         return cache_fsfilt->fs_send_bio(cache_inode, bio);
 325 }
 326
 327 static struct page *
 328 fsfilt_smfs_getpage(struct inode *inode, long int index)
 329 {
 330         struct  fsfilt_operations *cache_fsfilt;
 331         struct  inode *cache_inode;
 332
 333         cache_fsfilt = I2FOPS(inode);
 334         if (!cache_fsfilt)
 335                 RETURN(ERR_PTR(-EINVAL));
 336
 337         cache_inode = I2CI(inode);
 338         if (!cache_inode)
 339                 RETURN(ERR_PTR(-EINVAL));
 340
 341         if (!cache_fsfilt->fs_getpage)
 342                 RETURN(ERR_PTR(-ENOSYS));
 343
 344         return cache_fsfilt->fs_getpage(cache_inode, index);
 345 }
 346
 347 static ssize_t fsfilt_smfs_readpage(struct file *file, char *buf,
 348                                     size_t count, loff_t *off)
 349 {
 350         struct fsfilt_operations *cache_fsfilt;
 351         struct smfs_file_info *sfi;
 352         struct inode *cache_inode;
 353         loff_t tmp_ppos;
 354         loff_t *cache_ppos;
 355         ssize_t rc = -EIO;
 356
 357         ENTRY;
 358
 359         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 360         if (!cache_fsfilt)
 361                 RETURN(rc);
 362
 363         cache_inode = I2CI(file->f_dentry->d_inode);
 364         if (!cache_inode)
 365                 RETURN(rc);
 366
 367         sfi = F2SMFI(file);
 368         if (sfi->magic != SMFS_FILE_MAGIC)
 369                 BUG();
 370
 371         if (off != &(file->f_pos))
 372                 cache_ppos = &tmp_ppos;
 373         else
 374                 cache_ppos = &sfi->c_file->f_pos;
 375         *cache_ppos = *off;
 376
 377         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 378
 379         if (cache_fsfilt->fs_readpage)
 380                 rc = cache_fsfilt->fs_readpage(sfi->c_file, buf, count,
 381                                                cache_ppos);
 382
 383         *off = *cache_ppos;
 384         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 385         duplicate_file(file, sfi->c_file);
 386
 387         RETURN(rc);
 388 }
 389
 390
 391 static int fsfilt_smfs_add_journal_cb(struct obd_device *obd,
 392                                       struct super_block *sb, __u64 last_rcvd,
 393                                       void *handle, fsfilt_cb_t cb_func,
 394                                       void *cb_data)
 395 {
 396         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 397         struct super_block *csb = S2CSB(sb);
 398         int rc = -EIO;
 399
 400         if (!cache_fsfilt)
 401                  RETURN(rc);
 402         if (cache_fsfilt->fs_add_journal_cb)
 403                 rc = cache_fsfilt->fs_add_journal_cb(obd, csb, last_rcvd,
 404                                                      handle, cb_func, cb_data);
 405         RETURN(rc);
 406 }
 407
 408 static int fsfilt_smfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
 409 {
 410         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 411         struct super_block *csb = S2CSB(sb);
 412         int rc = -EIO;
 413
 414         if (!cache_fsfilt)
 415                 RETURN(rc);
 416
 417         if (!cache_fsfilt->fs_statfs)
 418                 RETURN(-ENOSYS);
 419
 420         rc = cache_fsfilt->fs_statfs(csb, osfs);
 421         duplicate_sb(csb, sb);
 422
 423         RETURN(rc);
 424 }
 425
 426 static int fsfilt_smfs_sync(struct super_block *sb)
 427 {
 428         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 429         struct super_block *csb = S2CSB(sb);
 430         int    rc = -EIO;
 431
 432         if (!cache_fsfilt)
 433                 RETURN(-EINVAL);
 434
 435         if (!cache_fsfilt->fs_sync)
 436                 RETURN(-ENOSYS);
 437
 438         rc = cache_fsfilt->fs_sync(csb);
 439
 440         RETURN(rc);
 441 }
 442
 443 int fsfilt_smfs_map_inode_pages(struct inode *inode, struct page **page,
 444                                 int pages, unsigned long *blocks, int *created,
 445                                 int create, struct semaphore *sem)
 446 {
 447         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 448         struct  inode *cache_inode = NULL;
 449         int     rc = -EIO;
 450
 451         if (!cache_fsfilt)
 452                 RETURN(-EINVAL);
 453
 454         cache_inode = I2CI(inode);
 455
 456         if (!cache_inode)
 457                 RETURN(rc);
 458
 459         if (!cache_fsfilt->fs_map_inode_pages)
 460                 RETURN(-ENOSYS);
 461
 462         down(&cache_inode->i_sem);
 463         rc = cache_fsfilt->fs_map_inode_pages(cache_inode, page, pages, blocks,
 464                                               created, create, sem);
 465         up(&cache_inode->i_sem);
 466
 467         RETURN(rc);
 468 }
 469
 470 static int fsfilt_smfs_prep_san_write(struct inode *inode, long *blocks,
 471                                       int nblocks, loff_t newsize)
 472 {
 473         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 474         struct  inode *cache_inode = NULL;
 475         int     rc = -EIO;
 476
 477         if (!cache_fsfilt)
 478                 RETURN(-EINVAL);
 479
 480         cache_inode = I2CI(inode);
 481
 482         if (!cache_inode)
 483                 RETURN(-EINVAL);
 484
 485         if (!cache_fsfilt->fs_prep_san_write)
 486                 RETURN(-ENOSYS);
 487
 488         down(&cache_inode->i_sem);
 489         rc = cache_fsfilt->fs_prep_san_write(cache_inode, blocks, nblocks,
 490                                              newsize);
 491         up(&cache_inode->i_sem);
 492
 493         RETURN(rc);
 494 }
 495
 496 static int fsfilt_smfs_read_record(struct file * file, void *buf,
 497                                    int size, loff_t *offs)
 498 {
 499         struct  fsfilt_operations *cache_fsfilt;
 500         struct  inode *cache_inode;
 501         struct  smfs_file_info *sfi;
 502         loff_t  tmp_ppos;
 503         loff_t  *cache_ppos;
 504         ssize_t rc;
 505
 506         ENTRY;
 507         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 508         if (!cache_fsfilt)
 509                 RETURN(-EINVAL);
 510
 511         cache_inode = I2CI(file->f_dentry->d_inode);
 512
 513         if (!cache_inode)
 514                 RETURN(-EINVAL);
 515
 516         sfi = F2SMFI(file);
 517         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 518
 519         if (offs != &(file->f_pos))
 520                 cache_ppos = &tmp_ppos;
 521         else
 522                 cache_ppos = &sfi->c_file->f_pos;
 523         *cache_ppos = *offs;
 524
 525         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 526
 527         if (!cache_fsfilt->fs_read_record)
 528                 RETURN(-ENOSYS);
 529
 530         rc = cache_fsfilt->fs_read_record(sfi->c_file, buf, size, cache_ppos);
 531
 532         *offs = *cache_ppos;
 533         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 534         duplicate_file(file, sfi->c_file);
 535
 536         RETURN(rc);
 537 }
 538
 539 static int fsfilt_smfs_write_record(struct file *file, void *buf, int bufsize,
 540                                     loff_t *offs, int force_sync)
 541 {
 542         struct  fsfilt_operations *cache_fsfilt;
 543         struct  inode *cache_inode;
 544         struct  smfs_file_info *sfi;
 545         loff_t  tmp_ppos;
 546         loff_t  *cache_ppos;
 547         ssize_t rc = -EIO;
 548
 549         ENTRY;
 550
 551         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 552         if (!cache_fsfilt)
 553                 RETURN(-EINVAL);
 554
 555         cache_inode = I2CI(file->f_dentry->d_inode);
 556
 557         if (!cache_inode)
 558                 RETURN(-EINVAL);
 559
 560         sfi = F2SMFI(file);
 561         if (sfi->magic != SMFS_FILE_MAGIC)
 562                 BUG();
 563
 564         if (offs != &(file->f_pos))
 565                 cache_ppos = &tmp_ppos;
 566         else
 567                 cache_ppos = &sfi->c_file->f_pos;
 568         *cache_ppos = *offs;
 569
 570         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 571
 572         if (!cache_fsfilt->fs_write_record)
 573                 RETURN(-ENOSYS);
 574
 575         rc = cache_fsfilt->fs_write_record(sfi->c_file, buf,
 576                                            bufsize, cache_ppos, force_sync);
 577         *offs = *cache_ppos;
 578         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 579         duplicate_file(file, sfi->c_file);
 580
 581         RETURN(rc);
 582 }
 583
 584 static int fsfilt_smfs_post_setup(struct obd_device *obd, struct vfsmount *mnt)
 585 {
 586         struct super_block *sb = NULL;
 587         int rc = 0;
 588
 589         if (mnt) {
 590                 sb = mnt->mnt_sb;
 591                 S2SMI(sb)->smsi_exp = obd->obd_self_export;
 592                 if (SMFS_DO_REC(S2SMI(sb)))
 593                         rc = smfs_start_rec(sb, mnt);
 594                 if (rc)
 595                         GOTO(exit, rc);
 596                 if (obd)
 597                         obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT] =
 598                                         S2SMI(sb)->smsi_rec_log;
 599         }
 600 exit:
 601         if (rc)
 602                 CERROR("can not do post setup in obd %p rc=%d", obd, rc);
 603
 604         RETURN(rc);
 605 }
 606
 607 static int fsfilt_smfs_post_cleanup(struct obd_device *obd,
 608                                     struct vfsmount *mnt)
 609 {
 610         struct super_block *sb = NULL;
 611         int rc = 0;
 612
 613         if (mnt) {
 614                 sb = mnt->mnt_sb;
 615                 if (SMFS_DO_REC(S2SMI(sb)))
 616                         rc = smfs_stop_rec(sb);
 617         }
 618         RETURN(rc);
 619 }
 620
 621 static int fsfilt_smfs_set_kml_flags(struct inode *inode)
 622 {
 623         int rc = 0;
 624         if (SMFS_DO_REC(S2SMI(inode->i_sb)))
 625                 SMFS_SET_INODE_REC(inode);
 626         RETURN(rc);
 627 }
 628
 629 static int fsfilt_smfs_clear_kml_flags(struct inode *inode)
 630 {
 631         int rc = 0;
 632         if (SMFS_DO_REC(S2SMI(inode->i_sb)))
 633                 SMFS_CLEAN_INODE_REC(inode);
 634         RETURN(rc);
 635 }
 636
 637 static int fsfilt_smfs_set_ost_flags(struct super_block *sb)
 638 {
 639         int rc = 0;
 640         SET_REC_PACK_TYPE_INDEX(S2SMI(sb)->smsi_flags, PACK_OST);
 641         RETURN(rc);
 642 }
 643
 644 static int fsfilt_smfs_set_mds_flags(struct super_block *sb)
 645 {
 646         int rc = 0;
 647         SET_REC_PACK_TYPE_INDEX(S2SMI(sb)->smsi_flags, PACK_MDS);
 648         RETURN(rc);
 649 }
 650
 651 static int fsfilt_smfs_get_reint_log_ctxt(struct super_block *sb,
 652                                           struct llog_ctxt **ctxt)
 653 {
 654         struct smfs_super_info *smfs_info = S2SMI(sb);
 655         int rc = 0;
 656
 657         *ctxt = smfs_info->smsi_rec_log;
 658         RETURN(rc);
 659 }
 660
 661 static int fsfilt_smfs_setup(struct obd_device *obd, struct super_block *sb)
 662 {
 663         struct smfs_super_info *smfs_info = S2SMI(sb);
 664         struct fsfilt_operations *cache_fsfilt;
 665         struct super_block *csb;
 666         int rc = 0;
 667
 668         /* It should be initialized olready by smfs_read_super(). */
 669         if (!(cache_fsfilt = smfs_info->sm_cache_fsfilt))
 670                     cache_fsfilt = fsfilt_get_ops(smfs_info->smsi_cache_ftype);
 671
 672         if (!cache_fsfilt)
 673                 RETURN(-ENOENT);
 674
 675         csb = S2CSB(sb);
 676         if (cache_fsfilt->fs_setup)
 677                 rc = cache_fsfilt->fs_setup(obd, csb);
 678         RETURN(rc);
 679 }
 680
 681 static int fsfilt_smfs_set_xattr(struct inode *inode, void *handle, char *name,
 682                                  void *buffer, int buffer_size)
 683 {
 684         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 685         struct  inode *cache_inode = NULL;
 686         int     rc = -EIO;
 687
 688         if (!cache_fsfilt)
 689                 RETURN(rc);
 690
 691         cache_inode = I2CI(inode);
 692         if (!cache_inode)
 693                 RETURN(rc);
 694
 695         pre_smfs_inode(inode, cache_inode);
 696
 697         if (cache_fsfilt->fs_set_xattr)
 698                 rc = cache_fsfilt->fs_set_xattr(cache_inode, handle, name,
 699                                                 buffer, buffer_size);
 700         post_smfs_inode(inode, cache_inode);
 701
 702         RETURN(rc);
 703 }
 704
 705 static int fsfilt_smfs_get_xattr(struct inode *inode, char *name,
 706                                  void *buffer, int buffer_size)
 707 {
 708         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 709         struct inode *cache_inode = NULL;
 710         int    rc = -EIO;
 711
 712         if (!cache_fsfilt)
 713                 RETURN(rc);
 714
 715         cache_inode = I2CI(inode);
 716         if (!cache_inode)
 717                 RETURN(rc);
 718
 719         pre_smfs_inode(inode, cache_inode);
 720
 721         if (cache_fsfilt->fs_get_xattr)
 722                 rc = cache_fsfilt->fs_get_xattr(cache_inode, name,
 723                                                 buffer, buffer_size);
 724         post_smfs_inode(inode, cache_inode);
 725
 726         RETURN(rc);
 727 }
 728
 729 static int fsfilt_smfs_insert_extents_ea(struct inode *inode,
 730                                          unsigned long from, unsigned long num)
 731 {
 732         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 733         struct inode *cache_inode = NULL;
 734         int    rc = -EIO;
 735
 736         if (!cache_fsfilt)
 737                 RETURN(rc);
 738
 739         cache_inode = I2CI(inode);
 740         if (!cache_inode)
 741                 RETURN(rc);
 742
 743         pre_smfs_inode(inode, cache_inode);
 744
 745         if (cache_fsfilt->fs_insert_extents_ea)
 746                 rc = cache_fsfilt->fs_insert_extents_ea(cache_inode, from, num);
 747
 748         post_smfs_inode(inode, cache_inode);
 749         return rc;
 750 }
 751
 752 static int fsfilt_smfs_remove_extents_ea(struct inode *inode,
 753                                          unsigned long from, unsigned long num)
 754 {
 755         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 756         struct inode *cache_inode = NULL;
 757         int    rc = -EIO;
 758
 759         if (!cache_fsfilt)
 760                 RETURN(rc);
 761
 762         cache_inode = I2CI(inode);
 763         if (!cache_inode)
 764                 RETURN(rc);
 765
 766         pre_smfs_inode(inode, cache_inode);
 767
 768         if (cache_fsfilt->fs_remove_extents_ea)
 769                 rc = cache_fsfilt->fs_remove_extents_ea(cache_inode, from, num);
 770
 771         post_smfs_inode(inode, cache_inode);
 772         return rc;
 773 }
 774
 775 static int fsfilt_smfs_init_extents_ea(struct inode *inode)
 776 {
 777         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 778         struct inode *cache_inode = NULL;
 779         int    rc = -EIO;
 780
 781         if (!cache_fsfilt)
 782                 RETURN(rc);
 783
 784         cache_inode = I2CI(inode);
 785         if (!cache_inode)
 786                 RETURN(rc);
 787
 788         pre_smfs_inode(inode, cache_inode);
 789
 790         if (cache_fsfilt->fs_init_extents_ea)
 791                 rc = cache_fsfilt->fs_init_extents_ea(cache_inode);
 792
 793         post_smfs_inode(inode, cache_inode);
 794         return rc;
 795 }
 796
 797 static int fsfilt_smfs_free_extents(struct super_block *sb, ino_t ino,
 798                                     char *pbuf, int size)
 799 {
 800         OBD_FREE(pbuf, size * (sizeof(struct ldlm_extent)));
 801         return 0;
 802 }
 803
 804 static int fsfilt_smfs_write_extents(struct dentry *dentry,
 805                                      unsigned long from, unsigned long num)
 806 {
 807         int rc = 0;
 808
 809         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 810                 rc = smfs_write_extents(dentry->d_inode, dentry, from, num);
 811
 812         return rc;
 813 }
 814
 815 static int fsfilt_smfs_precreate_rec(struct dentry *dentry, int *count,
 816                                      struct obdo *oa)
 817 {
 818         int rc = 0;
 819
 820         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 821                 rc = smfs_rec_precreate(dentry, count, oa);
 822
 823         return rc;
 824 }
 825
 826 static int fsfilt_smfs_get_ino_write_extents(struct super_block *sb, ino_t ino,
 827                                              char **pbuf, int *size)
 828 {
 829         struct fs_extent *fs_extents;
 830         struct ldlm_extent *extents = NULL;
 831         struct inode *inode;
 832         struct inode *cache_inode;
 833         struct fsfilt_operations *cache_fsfilt = NULL;
 834         struct lvfs_run_ctxt saved;
 835         int    rc = 0, fs_ex_size, ex_num, flags;
 836         char   *buf = NULL, *ex_buf = NULL;
 837
 838         push_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 839
 840         inode = iget(sb, ino);
 841
 842         if (!inode || is_bad_inode(inode)) {
 843                 CWARN("Can not get inode %lu ino\n", ino);
 844                 GOTO(out, rc = 0);
 845         }
 846         cache_inode = I2CI(inode);
 847         cache_fsfilt = I2FOPS(inode);
 848
 849         rc = cache_fsfilt->fs_get_xattr(cache_inode, REINT_EXTENTS_FLAGS,
 850                                         &flags, sizeof(int));
 851         if (!(flags & SMFS_OVER_WRITE) && !(flags & SMFS_DIRTY_WRITE)) {
 852                 GOTO(out, rc = 0);
 853         } else if (flags & SMFS_OVER_WRITE) {
 854                 *size = 1;
 855                 OBD_ALLOC(ex_buf, sizeof(struct ldlm_extent));
 856                 if (!ex_buf)
 857                         GOTO(out, rc=-ENOMEM);
 858                 extents = (struct ldlm_extent*)(ex_buf);
 859                 extents->start = 0;
 860                 extents->end = 0xffffffff;
 861         }
 862         if (rc < 0)
 863                 GOTO(out, rc);
 864         rc = cache_fsfilt->fs_get_write_extents_num(cache_inode, &fs_ex_size);
 865         if (rc)
 866                 GOTO(out, rc);
 867         OBD_ALLOC(buf, fs_ex_size);
 868         if (!buf)
 869                 GOTO(out, rc=-ENOMEM);
 870
 871         rc = cache_fsfilt->fs_get_inode_write_extents(cache_inode, &buf,
 872                                                       &fs_ex_size);
 873         if (rc < 0)
 874                 GOTO(out, rc);
 875         rc = 0;
 876         ex_num = fs_ex_size / sizeof(struct fs_extent);
 877         *size =  ex_num;
 878         OBD_ALLOC(ex_buf, ex_num* sizeof(struct ldlm_extent));
 879         if (!ex_buf)
 880                 GOTO(out, rc=-ENOMEM);
 881
 882         fs_extents = (struct fs_extent*)(buf);
 883         extents = (struct ldlm_extent*)(ex_buf);
 884         while (ex_num > 0) {
 885                 int blk_size = I2CI(inode)->i_blksize;
 886
 887                 extents->start = fs_extents->e_block * blk_size;
 888                 extents->end = extents->start + fs_extents->e_num * blk_size;
 889                 fs_extents++;
 890                 extents++;
 891                 ex_num--;
 892         }
 893         *pbuf = ex_buf;
 894 out:
 895         iput(inode);
 896         if (buf)
 897                 OBD_FREE(buf, fs_ex_size);
 898         if (rc && extents)
 899                 OBD_FREE(ex_buf, (*size) * (sizeof(struct ldlm_extent)));
 900         pop_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 901         return rc;
 902 }
 903
 904 static int fsfilt_smfs_set_snap_item(struct super_block *sb, char *name)
 905 {
 906         int rc = 0;
 907
 908         ENTRY;
 909 #if CONFIG_SNAPFS
 910         rc = smfs_add_snap_item(sb, name);
 911 #endif
 912         RETURN(rc);
 913 }
 914
 915 static struct fsfilt_operations fsfilt_smfs_ops = {
 916         .fs_type                = "smfs",
 917         .fs_owner               = THIS_MODULE,
 918         .fs_start               = fsfilt_smfs_start,
 919         .fs_brw_start           = fsfilt_smfs_brw_start,
 920         .fs_commit              = fsfilt_smfs_commit,
 921         .fs_commit_async        = fsfilt_smfs_commit_async,
 922         .fs_commit_wait         = fsfilt_smfs_commit_wait,
 923         .fs_setattr             = fsfilt_smfs_setattr,
 924         .fs_iocontrol           = fsfilt_smfs_iocontrol,
 925         .fs_set_md              = fsfilt_smfs_set_md,
 926         .fs_get_md              = fsfilt_smfs_get_md,
 927         .fs_readpage            = fsfilt_smfs_readpage,
 928         .fs_getpage             = fsfilt_smfs_getpage,
 929         .fs_add_journal_cb      = fsfilt_smfs_add_journal_cb,
 930         .fs_statfs              = fsfilt_smfs_statfs,
 931         .fs_sync                = fsfilt_smfs_sync,
 932         .fs_map_inode_pages     = fsfilt_smfs_map_inode_pages,
 933         .fs_prep_san_write      = fsfilt_smfs_prep_san_write,
 934         .fs_write_record        = fsfilt_smfs_write_record,
 935         .fs_read_record         = fsfilt_smfs_read_record,
 936         .fs_setup               = fsfilt_smfs_setup,
 937         .fs_post_setup          = fsfilt_smfs_post_setup,
 938         .fs_post_cleanup        = fsfilt_smfs_post_cleanup,
 939         .fs_set_kml_flags       = fsfilt_smfs_set_kml_flags,
 940         .fs_clear_kml_flags     = fsfilt_smfs_clear_kml_flags,
 941         .fs_set_ost_flags       = fsfilt_smfs_set_ost_flags,
 942         .fs_set_mds_flags       = fsfilt_smfs_set_mds_flags,
 943         .fs_precreate_rec       = fsfilt_smfs_precreate_rec,
 944         .fs_get_reint_log_ctxt  = fsfilt_smfs_get_reint_log_ctxt,
 945         .fs_send_bio            = fsfilt_smfs_send_bio,
 946         .fs_set_xattr           = fsfilt_smfs_set_xattr,
 947         .fs_get_xattr           = fsfilt_smfs_get_xattr,
 948         .fs_init_extents_ea     = fsfilt_smfs_init_extents_ea,
 949         .fs_insert_extents_ea   = fsfilt_smfs_insert_extents_ea,
 950         .fs_remove_extents_ea   = fsfilt_smfs_remove_extents_ea,
 951         .fs_get_ino_write_extents = fsfilt_smfs_get_ino_write_extents,
 952         .fs_free_write_extents  = fsfilt_smfs_free_extents,
 953         .fs_write_extents       = fsfilt_smfs_write_extents,
 954         .fs_set_snap_item       = fsfilt_smfs_set_snap_item,
 955
 956         /* FIXME-UMKA: probably fsfilt_smfs_get_op_len() should be
 957          * put here too. */
 958 };
 959
 960 static int __init fsfilt_smfs_init(void)
 961 {
 962         int rc;
 963
 964         rc = fsfilt_register_ops(&fsfilt_smfs_ops);
 965         return rc;
 966 }
 967
 968 static void __exit fsfilt_smfs_exit(void)
 969 {
 970         fsfilt_unregister_ops(&fsfilt_smfs_ops);
 971 }
 972
 973 module_init(fsfilt_smfs_init);
 974 module_exit(fsfilt_smfs_exit);
 975
 976 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 977 MODULE_DESCRIPTION("Lustre SMFS Filesystem Helper v0.1");
 978 MODULE_LICENSE("GPL");