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 #if 0
 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 #endif
 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 static int fsfilt_smfs_send_bio(int rw, struct inode *inode, struct kiobuf *bio)
 305 {
 306         struct inode *cache_inode;
 307         struct fsfilt_operations *cache_fsfilt;
 308
 309         cache_fsfilt = I2FOPS(inode);
 310         if (!cache_fsfilt)
 311                 RETURN(-EINVAL);
 312
 313         cache_inode = I2CI(inode);
 314         if (!cache_inode)
 315                 RETURN(-EINVAL);
 316
 317         if (!cache_fsfilt->fs_send_bio)
 318                 RETURN(-ENOSYS);
 319
 320         return cache_fsfilt->fs_send_bio(rw, cache_inode, bio);
 321 }
 322
 323 static struct page *
 324 fsfilt_smfs_getpage(struct inode *inode, long int index)
 325 {
 326         struct  fsfilt_operations *cache_fsfilt;
 327         struct  inode *cache_inode;
 328
 329         cache_fsfilt = I2FOPS(inode);
 330         if (!cache_fsfilt)
 331                 RETURN(ERR_PTR(-EINVAL));
 332
 333         cache_inode = I2CI(inode);
 334         if (!cache_inode)
 335                 RETURN(ERR_PTR(-EINVAL));
 336
 337         if (!cache_fsfilt->fs_getpage)
 338                 RETURN(ERR_PTR(-ENOSYS));
 339 #if CONFIG_SNAPFS
 340         if (SMFS_DO_COW(S2SMI(inode->i_sb))) {
 341                 struct address_space_operations *aops =
 342                                 cache_inode->i_mapping->a_ops;
 343                 if (aops->bmap(cache_inode->i_mapping, index)) {
 344                         struct inode *ind_inode = NULL;
 345                         struct inode *cache_ind = NULL;
 346                         struct page  *page = NULL;
 347
 348                         ind_inode = smfs_cow_get_ind(inode, index);
 349                         if (!ind_inode) {
 350                                 RETURN(ERR_PTR(-EIO));
 351                         }
 352                         cache_ind = I2CI(ind_inode);
 353                         /*FIXME cow inode should be bottom fs inode */
 354                         page = cache_fsfilt->fs_getpage(cache_ind, index);
 355                         iput(ind_inode);
 356                         RETURN(page);
 357                 }
 358         }
 359 #endif
 360         return cache_fsfilt->fs_getpage(cache_inode, index);
 361 }
 362
 363 static ssize_t fsfilt_smfs_readpage(struct file *file, char *buf,
 364                                     size_t count, loff_t *off)
 365 {
 366         struct fsfilt_operations *cache_fsfilt;
 367         struct smfs_file_info *sfi;
 368         struct inode *cache_inode;
 369         loff_t tmp_ppos;
 370         loff_t *cache_ppos;
 371         ssize_t rc = -EIO;
 372
 373         ENTRY;
 374
 375         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 376         if (!cache_fsfilt)
 377                 RETURN(rc);
 378
 379         cache_inode = I2CI(file->f_dentry->d_inode);
 380         if (!cache_inode)
 381                 RETURN(rc);
 382
 383         sfi = F2SMFI(file);
 384         if (sfi->magic != SMFS_FILE_MAGIC)
 385                 BUG();
 386
 387         if (off != &(file->f_pos))
 388                 cache_ppos = &tmp_ppos;
 389         else
 390                 cache_ppos = &sfi->c_file->f_pos;
 391         *cache_ppos = *off;
 392
 393         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 394 #if CONFIG_SNAPFS
 395         /*readdir page*/
 396         if (smfs_dotsnap_inode(file->f_dentry->d_inode)) {
 397                 struct fsfilt_operations *snapops =
 398                                         I2SNAPOPS(file->f_dentry->d_inode);
 399
 400                 LASSERT(S_ISDIR(file->f_dentry->d_inode->i_mode));
 401
 402                 rc = snapops->fs_read_dotsnap_dir_page(sfi->c_file, buf, count,
 403                                                        cache_ppos);
 404         } else {
 405                 if (cache_fsfilt->fs_readpage)
 406                         rc = cache_fsfilt->fs_readpage(sfi->c_file, buf, count,
 407                                                        cache_ppos);
 408         }
 409 #else
 410         if (cache_fsfilt->fs_readpage)
 411                 rc = cache_fsfilt->fs_readpage(sfi->c_file, buf, count,
 412                                                cache_ppos);
 413
 414 #endif
 415         *off = *cache_ppos;
 416         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 417         duplicate_file(file, sfi->c_file);
 418
 419         RETURN(rc);
 420 }
 421
 422
 423 static int fsfilt_smfs_add_journal_cb(struct obd_device *obd,
 424                                       struct super_block *sb, __u64 last_rcvd,
 425                                       void *handle, fsfilt_cb_t cb_func,
 426                                       void *cb_data)
 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(rc);
 434         if (cache_fsfilt->fs_add_journal_cb)
 435                 rc = cache_fsfilt->fs_add_journal_cb(obd, csb, last_rcvd,
 436                                                      handle, cb_func, cb_data);
 437         RETURN(rc);
 438 }
 439
 440 static int fsfilt_smfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
 441 {
 442         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 443         struct super_block *csb = S2CSB(sb);
 444         int rc = -EIO;
 445
 446         if (!cache_fsfilt)
 447                 RETURN(rc);
 448
 449         if (!cache_fsfilt->fs_statfs)
 450                 RETURN(-ENOSYS);
 451
 452         rc = cache_fsfilt->fs_statfs(csb, osfs);
 453         duplicate_sb(csb, sb);
 454
 455         RETURN(rc);
 456 }
 457
 458 static int fsfilt_smfs_sync(struct super_block *sb)
 459 {
 460         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 461         struct super_block *csb = S2CSB(sb);
 462         int    rc = -EIO;
 463
 464         if (!cache_fsfilt)
 465                 RETURN(-EINVAL);
 466
 467         if (!cache_fsfilt->fs_sync)
 468                 RETURN(-ENOSYS);
 469
 470         rc = cache_fsfilt->fs_sync(csb);
 471
 472         RETURN(rc);
 473 }
 474
 475 int fsfilt_smfs_map_inode_pages(struct inode *inode, struct page **page,
 476                                 int pages, unsigned long *blocks, int *created,
 477                                 int create, struct semaphore *sem)
 478 {
 479         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 480         struct  inode *cache_inode = NULL;
 481         int     rc = -EIO;
 482
 483         if (!cache_fsfilt)
 484                 RETURN(-EINVAL);
 485
 486         cache_inode = I2CI(inode);
 487
 488         if (!cache_inode)
 489                 RETURN(rc);
 490
 491         if (!cache_fsfilt->fs_map_inode_pages)
 492                 RETURN(-ENOSYS);
 493
 494         down(&cache_inode->i_sem);
 495         rc = cache_fsfilt->fs_map_inode_pages(cache_inode, page, pages, blocks,
 496                                               created, create, sem);
 497         up(&cache_inode->i_sem);
 498
 499         RETURN(rc);
 500 }
 501
 502 static int fsfilt_smfs_prep_san_write(struct inode *inode, long *blocks,
 503                                       int nblocks, loff_t newsize)
 504 {
 505         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 506         struct  inode *cache_inode = NULL;
 507         int     rc = -EIO;
 508
 509         if (!cache_fsfilt)
 510                 RETURN(-EINVAL);
 511
 512         cache_inode = I2CI(inode);
 513
 514         if (!cache_inode)
 515                 RETURN(-EINVAL);
 516
 517         if (!cache_fsfilt->fs_prep_san_write)
 518                 RETURN(-ENOSYS);
 519
 520         down(&cache_inode->i_sem);
 521         rc = cache_fsfilt->fs_prep_san_write(cache_inode, blocks, nblocks,
 522                                              newsize);
 523         up(&cache_inode->i_sem);
 524
 525         RETURN(rc);
 526 }
 527
 528 static int fsfilt_smfs_read_record(struct file * file, void *buf,
 529                                    int size, loff_t *offs)
 530 {
 531         struct  fsfilt_operations *cache_fsfilt;
 532         struct  inode *cache_inode;
 533         struct  smfs_file_info *sfi;
 534         loff_t  tmp_ppos;
 535         loff_t  *cache_ppos;
 536         ssize_t rc;
 537
 538         ENTRY;
 539         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 540         if (!cache_fsfilt)
 541                 RETURN(-EINVAL);
 542
 543         cache_inode = I2CI(file->f_dentry->d_inode);
 544
 545         if (!cache_inode)
 546                 RETURN(-EINVAL);
 547
 548         sfi = F2SMFI(file);
 549         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 550
 551         if (offs != &(file->f_pos))
 552                 cache_ppos = &tmp_ppos;
 553         else
 554                 cache_ppos = &sfi->c_file->f_pos;
 555         *cache_ppos = *offs;
 556
 557         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 558
 559         if (!cache_fsfilt->fs_read_record)
 560                 RETURN(-ENOSYS);
 561
 562         rc = cache_fsfilt->fs_read_record(sfi->c_file, buf, size, cache_ppos);
 563
 564         *offs = *cache_ppos;
 565         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 566         duplicate_file(file, sfi->c_file);
 567
 568         RETURN(rc);
 569 }
 570
 571 static int fsfilt_smfs_write_record(struct file *file, void *buf, int bufsize,
 572                                     loff_t *offs, int force_sync)
 573 {
 574         struct  fsfilt_operations *cache_fsfilt;
 575         struct  inode *cache_inode;
 576         struct  smfs_file_info *sfi;
 577         loff_t  tmp_ppos;
 578         loff_t  *cache_ppos;
 579         ssize_t rc = -EIO;
 580
 581         ENTRY;
 582
 583         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 584         if (!cache_fsfilt)
 585                 RETURN(-EINVAL);
 586
 587         cache_inode = I2CI(file->f_dentry->d_inode);
 588
 589         if (!cache_inode)
 590                 RETURN(-EINVAL);
 591
 592         sfi = F2SMFI(file);
 593         if (sfi->magic != SMFS_FILE_MAGIC)
 594                 BUG();
 595
 596         if (offs != &(file->f_pos))
 597                 cache_ppos = &tmp_ppos;
 598         else
 599                 cache_ppos = &sfi->c_file->f_pos;
 600         *cache_ppos = *offs;
 601
 602         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 603
 604         if (!cache_fsfilt->fs_write_record)
 605                 RETURN(-ENOSYS);
 606
 607         rc = cache_fsfilt->fs_write_record(sfi->c_file, buf,
 608                                            bufsize, cache_ppos, force_sync);
 609         *offs = *cache_ppos;
 610         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 611         duplicate_file(file, sfi->c_file);
 612
 613         RETURN(rc);
 614 }
 615
 616 static int fsfilt_smfs_post_setup(struct obd_device *obd, struct vfsmount *mnt,
 617                                   struct dentry *root_dentry)
 618 {
 619         struct super_block *sb = NULL;
 620         int rc = 0;
 621
 622         if (mnt) {
 623                 sb = mnt->mnt_sb;
 624                 S2SMI(sb)->smsi_exp = obd->obd_self_export;
 625                 smfs_post_setup(sb, mnt);
 626                 if (SMFS_DO_REC(S2SMI(sb)))
 627                         rc = smfs_start_rec(sb, mnt);
 628                 if (rc)
 629                         GOTO(exit, rc);
 630                 if (obd)
 631                         obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT] =
 632                                         S2SMI(sb)->smsi_rec_log;
 633         }
 634 exit:
 635         if (rc)
 636                 CERROR("can not do post setup in obd %p rc=%d", obd, rc);
 637
 638         RETURN(rc);
 639 }
 640
 641 static int fsfilt_smfs_post_cleanup(struct obd_device *obd,
 642                                     struct vfsmount *mnt)
 643 {
 644         struct super_block *sb = NULL;
 645         int rc = 0;
 646         ENTRY;
 647
 648         if (mnt) {
 649                 sb = mnt->mnt_sb;
 650                 if (SMFS_DO_REC(S2SMI(sb)))
 651                         rc = smfs_stop_rec(sb);
 652                 smfs_post_cleanup(sb);
 653         }
 654         RETURN(rc);
 655 }
 656
 657 static int fsfilt_smfs_set_fs_flags(struct inode *inode, int flags)
 658 {
 659         int rc = 0;
 660         ENTRY;
 661
 662         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && (flags & SM_DO_REC))
 663                 SMFS_SET_INODE_REC(inode);
 664         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && (flags & SM_DO_COW))
 665                 SMFS_SET_INODE_COW(inode);
 666         RETURN(rc);
 667 }
 668
 669 static int fsfilt_smfs_clear_fs_flags(struct inode *inode, int flags)
 670 {
 671         int rc = 0;
 672         ENTRY;
 673
 674         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && (flags & SM_DO_REC))
 675                 SMFS_CLEAN_INODE_REC(inode);
 676         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && (flags & SM_DO_COW))
 677                 SMFS_CLEAN_INODE_COW(inode);
 678         RETURN(rc);
 679 }
 680
 681 static int fsfilt_smfs_get_fs_flags(struct dentry *de)
 682 {
 683         struct inode *inode = de->d_inode;
 684         int flags = 0;
 685         ENTRY;
 686
 687         LASSERT(inode);
 688
 689         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && SMFS_DO_INODE_REC(inode))
 690                 flags |= SM_DO_REC;
 691         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && SMFS_DO_INODE_COW(inode))
 692                 flags |= SM_DO_COW;
 693
 694         RETURN(flags);
 695 }
 696 static int fsfilt_smfs_set_ost_flags(struct super_block *sb)
 697 {
 698         int rc = 0;
 699         SET_REC_PACK_TYPE_INDEX(S2SMI(sb)->smsi_flags, PACK_OST);
 700         RETURN(rc);
 701 }
 702
 703 static int fsfilt_smfs_set_mds_flags(struct super_block *sb)
 704 {
 705         int rc = 0;
 706         SET_REC_PACK_TYPE_INDEX(S2SMI(sb)->smsi_flags, PACK_MDS);
 707         RETURN(rc);
 708 }
 709
 710 static int fsfilt_smfs_get_reint_log_ctxt(struct super_block *sb,
 711                                           struct llog_ctxt **ctxt)
 712 {
 713         struct smfs_super_info *smfs_info = S2SMI(sb);
 714         int rc = 0;
 715
 716         *ctxt = smfs_info->smsi_rec_log;
 717         RETURN(rc);
 718 }
 719
 720 static int fsfilt_smfs_setup(struct obd_device *obd, struct super_block *sb)
 721 {
 722         struct smfs_super_info *smfs_info = S2SMI(sb);
 723         struct fsfilt_operations *cache_fsfilt;
 724         struct super_block *csb;
 725         int rc = 0;
 726
 727         /* It should be initialized olready by smfs_read_super(). */
 728         if (!(cache_fsfilt = smfs_info->sm_cache_fsfilt))
 729                     cache_fsfilt = fsfilt_get_ops(smfs_info->smsi_cache_ftype);
 730
 731         if (!cache_fsfilt)
 732                 RETURN(-ENOENT);
 733
 734         csb = S2CSB(sb);
 735         if (cache_fsfilt->fs_setup)
 736                 rc = cache_fsfilt->fs_setup(obd, csb);
 737
 738         duplicate_sb(sb, csb);
 739
 740         RETURN(rc);
 741 }
 742
 743 static int fsfilt_smfs_set_xattr(struct inode *inode, void *handle, char *name,
 744                                  void *buffer, int buffer_size)
 745 {
 746         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 747         struct  inode *cache_inode = NULL;
 748         int     rc = -EIO;
 749
 750         if (!cache_fsfilt)
 751                 RETURN(rc);
 752
 753         cache_inode = I2CI(inode);
 754         if (!cache_inode)
 755                 RETURN(rc);
 756
 757         pre_smfs_inode(inode, cache_inode);
 758
 759         if (cache_fsfilt->fs_set_xattr)
 760                 rc = cache_fsfilt->fs_set_xattr(cache_inode, handle, name,
 761                                                 buffer, buffer_size);
 762         post_smfs_inode(inode, cache_inode);
 763
 764         RETURN(rc);
 765 }
 766
 767 static int fsfilt_smfs_get_xattr(struct inode *inode, char *name,
 768                                  void *buffer, int buffer_size)
 769 {
 770         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 771         struct inode *cache_inode = NULL;
 772         int    rc = -EIO;
 773
 774         if (!cache_fsfilt)
 775                 RETURN(rc);
 776
 777         cache_inode = I2CI(inode);
 778         if (!cache_inode)
 779                 RETURN(rc);
 780
 781         pre_smfs_inode(inode, cache_inode);
 782
 783         if (cache_fsfilt->fs_get_xattr)
 784                 rc = cache_fsfilt->fs_get_xattr(cache_inode, name,
 785                                                 buffer, buffer_size);
 786         post_smfs_inode(inode, cache_inode);
 787
 788         RETURN(rc);
 789 }
 790
 791 static int fsfilt_smfs_insert_extents_ea(struct inode *inode,
 792                                          unsigned long from, unsigned long num)
 793 {
 794         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 795         struct inode *cache_inode = NULL;
 796         int    rc = -EIO;
 797
 798         if (!cache_fsfilt)
 799                 RETURN(rc);
 800
 801         cache_inode = I2CI(inode);
 802         if (!cache_inode)
 803                 RETURN(rc);
 804
 805         pre_smfs_inode(inode, cache_inode);
 806
 807         if (cache_fsfilt->fs_insert_extents_ea)
 808                 rc = cache_fsfilt->fs_insert_extents_ea(cache_inode, from, num);
 809
 810         post_smfs_inode(inode, cache_inode);
 811         return rc;
 812 }
 813
 814 static int fsfilt_smfs_remove_extents_ea(struct inode *inode,
 815                                          unsigned long from, unsigned long num)
 816 {
 817         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 818         struct inode *cache_inode = NULL;
 819         int    rc = -EIO;
 820
 821         if (!cache_fsfilt)
 822                 RETURN(rc);
 823
 824         cache_inode = I2CI(inode);
 825         if (!cache_inode)
 826                 RETURN(rc);
 827
 828         pre_smfs_inode(inode, cache_inode);
 829
 830         if (cache_fsfilt->fs_remove_extents_ea)
 831                 rc = cache_fsfilt->fs_remove_extents_ea(cache_inode, from, num);
 832
 833         post_smfs_inode(inode, cache_inode);
 834         return rc;
 835 }
 836
 837 static int fsfilt_smfs_init_extents_ea(struct inode *inode)
 838 {
 839         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 840         struct inode *cache_inode = NULL;
 841         int    rc = -EIO;
 842
 843         if (!cache_fsfilt)
 844                 RETURN(rc);
 845
 846         cache_inode = I2CI(inode);
 847         if (!cache_inode)
 848                 RETURN(rc);
 849
 850         pre_smfs_inode(inode, cache_inode);
 851
 852         if (cache_fsfilt->fs_init_extents_ea)
 853                 rc = cache_fsfilt->fs_init_extents_ea(cache_inode);
 854
 855         post_smfs_inode(inode, cache_inode);
 856         return rc;
 857 }
 858
 859 static int fsfilt_smfs_free_extents(struct super_block *sb, ino_t ino,
 860                                     char *pbuf, int size)
 861 {
 862         OBD_FREE(pbuf, size * (sizeof(struct ldlm_extent)));
 863         return 0;
 864 }
 865
 866 static int fsfilt_smfs_write_extents(struct dentry *dentry,
 867                                      unsigned long from, unsigned long num)
 868 {
 869         int rc = 0;
 870
 871         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 872                 rc = smfs_write_extents(dentry->d_inode, dentry, from, num);
 873
 874         return rc;
 875 }
 876
 877 static int fsfilt_smfs_precreate_rec(struct dentry *dentry, int *count,
 878                                      struct obdo *oa)
 879 {
 880         int rc = 0;
 881
 882         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 883                 rc = smfs_rec_precreate(dentry, count, oa);
 884
 885         return rc;
 886 }
 887
 888 static int fsfilt_smfs_get_ino_write_extents(struct super_block *sb, ino_t ino,
 889                                              char **pbuf, int *size)
 890 {
 891         struct fs_extent *fs_extents;
 892         struct ldlm_extent *extents = NULL;
 893         struct inode *inode;
 894         struct inode *cache_inode;
 895         struct fsfilt_operations *cache_fsfilt = NULL;
 896         struct lvfs_run_ctxt saved;
 897         int    rc = 0, fs_ex_size, ex_num, flags;
 898         char   *buf = NULL, *ex_buf = NULL;
 899
 900         push_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 901
 902         inode = iget(sb, ino);
 903
 904         if (!inode || is_bad_inode(inode)) {
 905                 CWARN("Can not get inode %lu ino\n", ino);
 906                 GOTO(out, rc = 0);
 907         }
 908         cache_inode = I2CI(inode);
 909         cache_fsfilt = I2FOPS(inode);
 910
 911         rc = cache_fsfilt->fs_get_xattr(cache_inode, REINT_EXTENTS_FLAGS,
 912                                         &flags, sizeof(int));
 913         if (!(flags & SMFS_OVER_WRITE) && !(flags & SMFS_DIRTY_WRITE)) {
 914                 GOTO(out, rc = 0);
 915         } else if (flags & SMFS_OVER_WRITE) {
 916                 *size = 1;
 917                 OBD_ALLOC(ex_buf, sizeof(struct ldlm_extent));
 918                 if (!ex_buf)
 919                         GOTO(out, rc=-ENOMEM);
 920                 extents = (struct ldlm_extent*)(ex_buf);
 921                 extents->start = 0;
 922                 extents->end = 0xffffffff;
 923         }
 924         if (rc < 0)
 925                 GOTO(out, rc);
 926         rc = cache_fsfilt->fs_get_write_extents_num(cache_inode, &fs_ex_size);
 927         if (rc)
 928                 GOTO(out, rc);
 929         OBD_ALLOC(buf, fs_ex_size);
 930         if (!buf)
 931                 GOTO(out, rc=-ENOMEM);
 932
 933         rc = cache_fsfilt->fs_get_inode_write_extents(cache_inode, &buf,
 934                                                       &fs_ex_size);
 935         if (rc < 0)
 936                 GOTO(out, rc);
 937         rc = 0;
 938         ex_num = fs_ex_size / sizeof(struct fs_extent);
 939         *size =  ex_num;
 940         OBD_ALLOC(ex_buf, ex_num* sizeof(struct ldlm_extent));
 941         if (!ex_buf)
 942                 GOTO(out, rc=-ENOMEM);
 943
 944         fs_extents = (struct fs_extent*)(buf);
 945         extents = (struct ldlm_extent*)(ex_buf);
 946         while (ex_num > 0) {
 947                 int blk_size = I2CI(inode)->i_blksize;
 948
 949                 extents->start = fs_extents->e_block * blk_size;
 950                 extents->end = extents->start + fs_extents->e_num * blk_size;
 951                 fs_extents++;
 952                 extents++;
 953                 ex_num--;
 954         }
 955         *pbuf = ex_buf;
 956 out:
 957         iput(inode);
 958         if (buf)
 959                 OBD_FREE(buf, fs_ex_size);
 960         if (rc && extents)
 961                 OBD_FREE(ex_buf, (*size) * (sizeof(struct ldlm_extent)));
 962         pop_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 963         return rc;
 964 }
 965
 966 static int fsfilt_smfs_set_snap_item(struct super_block *sb, char *name)
 967 {
 968         int rc = 0;
 969
 970         ENTRY;
 971 #if CONFIG_SNAPFS
 972 #warning "still not implement for add snap item -wangdi"
 973 #endif
 974         RETURN(rc);
 975 }
 976 static int fsfilt_smfs_do_write_cow(struct dentry *de, void *extents,
 977                                     int num_extents)
 978 {
 979         int rc = 0;
 980 #if CONFIG_SNAPFS
 981         struct write_extents *w_ext = (struct write_extents *)extents;
 982         int i = 0;
 983         ENTRY;
 984         for (i = 0; i < num_extents; i++) {
 985                size_t count = w_ext->w_count;
 986                loff_t off = w_ext->w_pos;
 987                rc = smfs_cow_write_pre(de->d_inode, de, &count, &off);
 988                if (rc)
 989                         RETURN(rc);
 990                w_ext ++;
 991         }
 992 #endif
 993         RETURN(rc);
 994 }
 995 static struct fsfilt_operations fsfilt_smfs_ops = {
 996         .fs_type                = "smfs",
 997         .fs_owner               = THIS_MODULE,
 998         .fs_start               = fsfilt_smfs_start,
 999         .fs_brw_start           = fsfilt_smfs_brw_start,
1000         .fs_commit              = fsfilt_smfs_commit,
1001         .fs_commit_async        = fsfilt_smfs_commit_async,
1002         .fs_commit_wait         = fsfilt_smfs_commit_wait,
1003         .fs_setattr             = fsfilt_smfs_setattr,
1004         .fs_iocontrol           = fsfilt_smfs_iocontrol,
1005         .fs_set_md              = fsfilt_smfs_set_md,
1006         .fs_get_md              = fsfilt_smfs_get_md,
1007         .fs_readpage            = fsfilt_smfs_readpage,
1008         .fs_getpage             = fsfilt_smfs_getpage,
1009         .fs_add_journal_cb      = fsfilt_smfs_add_journal_cb,
1010         .fs_statfs              = fsfilt_smfs_statfs,
1011         .fs_sync                = fsfilt_smfs_sync,
1012         .fs_map_inode_pages     = fsfilt_smfs_map_inode_pages,
1013         .fs_prep_san_write      = fsfilt_smfs_prep_san_write,
1014         .fs_write_record        = fsfilt_smfs_write_record,
1015         .fs_read_record         = fsfilt_smfs_read_record,
1016         .fs_setup               = fsfilt_smfs_setup,
1017         .fs_post_setup          = fsfilt_smfs_post_setup,
1018         .fs_post_cleanup        = fsfilt_smfs_post_cleanup,
1019         .fs_set_fs_flags       = fsfilt_smfs_set_fs_flags,
1020         .fs_clear_fs_flags     = fsfilt_smfs_clear_fs_flags,
1021         .fs_get_fs_flags       = fsfilt_smfs_get_fs_flags,
1022         .fs_set_ost_flags       = fsfilt_smfs_set_ost_flags,
1023         .fs_set_mds_flags       = fsfilt_smfs_set_mds_flags,
1024         .fs_precreate_rec       = fsfilt_smfs_precreate_rec,
1025         .fs_get_reint_log_ctxt  = fsfilt_smfs_get_reint_log_ctxt,
1026         .fs_send_bio            = fsfilt_smfs_send_bio,
1027         .fs_set_xattr           = fsfilt_smfs_set_xattr,
1028         .fs_get_xattr           = fsfilt_smfs_get_xattr,
1029         .fs_init_extents_ea     = fsfilt_smfs_init_extents_ea,
1030         .fs_insert_extents_ea   = fsfilt_smfs_insert_extents_ea,
1031         .fs_remove_extents_ea   = fsfilt_smfs_remove_extents_ea,
1032         .fs_get_ino_write_extents = fsfilt_smfs_get_ino_write_extents,
1033         .fs_free_write_extents  = fsfilt_smfs_free_extents,
1034         .fs_write_extents       = fsfilt_smfs_write_extents,
1035         .fs_set_snap_item       = fsfilt_smfs_set_snap_item,
1036         .fs_do_write_cow        = fsfilt_smfs_do_write_cow,
1037         /* FIXME-UMKA: probably fsfilt_smfs_get_op_len() should be
1038          * put here too. */
1039 };
1040
1041 static int __init fsfilt_smfs_init(void)
1042 {
1043         int rc;
1044
1045         rc = fsfilt_register_ops(&fsfilt_smfs_ops);
1046         return rc;
1047 }
1048
1049 static void __exit fsfilt_smfs_exit(void)
1050 {
1051         fsfilt_unregister_ops(&fsfilt_smfs_ops);
1052 }
1053
1054 module_init(fsfilt_smfs_init);
1055 module_exit(fsfilt_smfs_exit);
1056
1057 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1058 MODULE_DESCRIPTION("Lustre SMFS Filesystem Helper v0.1");
1059 MODULE_LICENSE("GPL");