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 #if CONFIG_SNAPFS
 344         if (SMFS_DO_COW(S2SMI(inode->i_sb))) {
 345                 struct address_space_operations *aops =
 346                                 cache_inode->i_mapping->a_ops;
 347                 if (aops->bmap(cache_inode->i_mapping, index)) {
 348                         struct inode *ind_inode = NULL;
 349                         struct inode *cache_ind = NULL;
 350                         struct page  *page = NULL;
 351
 352                         ind_inode = smfs_cow_get_ind(inode, index);
 353                         if (!ind_inode) {
 354                                 RETURN(ERR_PTR(-EIO));
 355                         }
 356                         cache_ind = I2CI(ind_inode);
 357                         /*FIXME cow inode should be bottom fs inode */
 358                         page = cache_fsfilt->fs_getpage(cache_ind, index);
 359                         iput(ind_inode);
 360                         RETURN(page);
 361                 }
 362         }
 363 #endif
 364         return cache_fsfilt->fs_getpage(cache_inode, index);
 365 }
 366
 367 static ssize_t fsfilt_smfs_readpage(struct file *file, char *buf,
 368                                     size_t count, loff_t *off)
 369 {
 370         struct fsfilt_operations *cache_fsfilt;
 371         struct smfs_file_info *sfi;
 372         struct inode *cache_inode;
 373         loff_t tmp_ppos;
 374         loff_t *cache_ppos;
 375         ssize_t rc = -EIO;
 376
 377         ENTRY;
 378
 379         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 380         if (!cache_fsfilt)
 381                 RETURN(rc);
 382
 383         cache_inode = I2CI(file->f_dentry->d_inode);
 384         if (!cache_inode)
 385                 RETURN(rc);
 386
 387         sfi = F2SMFI(file);
 388         if (sfi->magic != SMFS_FILE_MAGIC)
 389                 BUG();
 390
 391         if (off != &(file->f_pos))
 392                 cache_ppos = &tmp_ppos;
 393         else
 394                 cache_ppos = &sfi->c_file->f_pos;
 395         *cache_ppos = *off;
 396
 397         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 398
 399         if (cache_fsfilt->fs_readpage)
 400                 rc = cache_fsfilt->fs_readpage(sfi->c_file, buf, count,
 401                                                cache_ppos);
 402
 403         *off = *cache_ppos;
 404         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 405         duplicate_file(file, sfi->c_file);
 406
 407         RETURN(rc);
 408 }
 409
 410
 411 static int fsfilt_smfs_add_journal_cb(struct obd_device *obd,
 412                                       struct super_block *sb, __u64 last_rcvd,
 413                                       void *handle, fsfilt_cb_t cb_func,
 414                                       void *cb_data)
 415 {
 416         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 417         struct super_block *csb = S2CSB(sb);
 418         int rc = -EIO;
 419
 420         if (!cache_fsfilt)
 421                  RETURN(rc);
 422         if (cache_fsfilt->fs_add_journal_cb)
 423                 rc = cache_fsfilt->fs_add_journal_cb(obd, csb, last_rcvd,
 424                                                      handle, cb_func, cb_data);
 425         RETURN(rc);
 426 }
 427
 428 static int fsfilt_smfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
 429 {
 430         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 431         struct super_block *csb = S2CSB(sb);
 432         int rc = -EIO;
 433
 434         if (!cache_fsfilt)
 435                 RETURN(rc);
 436
 437         if (!cache_fsfilt->fs_statfs)
 438                 RETURN(-ENOSYS);
 439
 440         rc = cache_fsfilt->fs_statfs(csb, osfs);
 441         duplicate_sb(csb, sb);
 442
 443         RETURN(rc);
 444 }
 445
 446 static int fsfilt_smfs_sync(struct super_block *sb)
 447 {
 448         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 449         struct super_block *csb = S2CSB(sb);
 450         int    rc = -EIO;
 451
 452         if (!cache_fsfilt)
 453                 RETURN(-EINVAL);
 454
 455         if (!cache_fsfilt->fs_sync)
 456                 RETURN(-ENOSYS);
 457
 458         rc = cache_fsfilt->fs_sync(csb);
 459
 460         RETURN(rc);
 461 }
 462
 463 int fsfilt_smfs_map_inode_pages(struct inode *inode, struct page **page,
 464                                 int pages, unsigned long *blocks, int *created,
 465                                 int create, struct semaphore *sem)
 466 {
 467         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 468         struct  inode *cache_inode = NULL;
 469         int     rc = -EIO;
 470
 471         if (!cache_fsfilt)
 472                 RETURN(-EINVAL);
 473
 474         cache_inode = I2CI(inode);
 475
 476         if (!cache_inode)
 477                 RETURN(rc);
 478
 479         if (!cache_fsfilt->fs_map_inode_pages)
 480                 RETURN(-ENOSYS);
 481
 482         down(&cache_inode->i_sem);
 483         rc = cache_fsfilt->fs_map_inode_pages(cache_inode, page, pages, blocks,
 484                                               created, create, sem);
 485         up(&cache_inode->i_sem);
 486
 487         RETURN(rc);
 488 }
 489
 490 static int fsfilt_smfs_prep_san_write(struct inode *inode, long *blocks,
 491                                       int nblocks, loff_t newsize)
 492 {
 493         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 494         struct  inode *cache_inode = NULL;
 495         int     rc = -EIO;
 496
 497         if (!cache_fsfilt)
 498                 RETURN(-EINVAL);
 499
 500         cache_inode = I2CI(inode);
 501
 502         if (!cache_inode)
 503                 RETURN(-EINVAL);
 504
 505         if (!cache_fsfilt->fs_prep_san_write)
 506                 RETURN(-ENOSYS);
 507
 508         down(&cache_inode->i_sem);
 509         rc = cache_fsfilt->fs_prep_san_write(cache_inode, blocks, nblocks,
 510                                              newsize);
 511         up(&cache_inode->i_sem);
 512
 513         RETURN(rc);
 514 }
 515
 516 static int fsfilt_smfs_read_record(struct file * file, void *buf,
 517                                    int size, loff_t *offs)
 518 {
 519         struct  fsfilt_operations *cache_fsfilt;
 520         struct  inode *cache_inode;
 521         struct  smfs_file_info *sfi;
 522         loff_t  tmp_ppos;
 523         loff_t  *cache_ppos;
 524         ssize_t rc;
 525
 526         ENTRY;
 527         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 528         if (!cache_fsfilt)
 529                 RETURN(-EINVAL);
 530
 531         cache_inode = I2CI(file->f_dentry->d_inode);
 532
 533         if (!cache_inode)
 534                 RETURN(-EINVAL);
 535
 536         sfi = F2SMFI(file);
 537         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 538
 539         if (offs != &(file->f_pos))
 540                 cache_ppos = &tmp_ppos;
 541         else
 542                 cache_ppos = &sfi->c_file->f_pos;
 543         *cache_ppos = *offs;
 544
 545         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 546
 547         if (!cache_fsfilt->fs_read_record)
 548                 RETURN(-ENOSYS);
 549
 550         rc = cache_fsfilt->fs_read_record(sfi->c_file, buf, size, cache_ppos);
 551
 552         *offs = *cache_ppos;
 553         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 554         duplicate_file(file, sfi->c_file);
 555
 556         RETURN(rc);
 557 }
 558
 559 static int fsfilt_smfs_write_record(struct file *file, void *buf, int bufsize,
 560                                     loff_t *offs, int force_sync)
 561 {
 562         struct  fsfilt_operations *cache_fsfilt;
 563         struct  inode *cache_inode;
 564         struct  smfs_file_info *sfi;
 565         loff_t  tmp_ppos;
 566         loff_t  *cache_ppos;
 567         ssize_t rc = -EIO;
 568
 569         ENTRY;
 570
 571         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 572         if (!cache_fsfilt)
 573                 RETURN(-EINVAL);
 574
 575         cache_inode = I2CI(file->f_dentry->d_inode);
 576
 577         if (!cache_inode)
 578                 RETURN(-EINVAL);
 579
 580         sfi = F2SMFI(file);
 581         if (sfi->magic != SMFS_FILE_MAGIC)
 582                 BUG();
 583
 584         if (offs != &(file->f_pos))
 585                 cache_ppos = &tmp_ppos;
 586         else
 587                 cache_ppos = &sfi->c_file->f_pos;
 588         *cache_ppos = *offs;
 589
 590         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 591
 592         if (!cache_fsfilt->fs_write_record)
 593                 RETURN(-ENOSYS);
 594
 595         rc = cache_fsfilt->fs_write_record(sfi->c_file, buf,
 596                                            bufsize, cache_ppos, force_sync);
 597         *offs = *cache_ppos;
 598         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 599         duplicate_file(file, sfi->c_file);
 600
 601         RETURN(rc);
 602 }
 603
 604 static int fsfilt_smfs_post_setup(struct obd_device *obd, struct vfsmount *mnt,
 605                                   struct dentry *root_dentry)
 606 {
 607         struct super_block *sb = NULL;
 608         int rc = 0;
 609
 610         if (mnt) {
 611                 sb = mnt->mnt_sb;
 612                 S2SMI(sb)->smsi_exp = obd->obd_self_export;
 613                 smfs_post_setup(sb, mnt);
 614                 if (SMFS_DO_REC(S2SMI(sb)))
 615                         rc = smfs_start_rec(sb, mnt);
 616 #if CONFIG_SNAPFS
 617                 if (SMFS_DO_COW(S2SMI(sb))) {
 618                        S2SNAPI(sb)->snap_root = root_dentry;
 619                        rc = smfs_start_cow(sb);
 620                 }
 621 #endif
 622                 if (rc)
 623                         GOTO(exit, rc);
 624                 if (obd)
 625                         obd->obd_llog_ctxt[LLOG_REINT_ORIG_CTXT] =
 626                                         S2SMI(sb)->smsi_rec_log;
 627         }
 628 exit:
 629         if (rc)
 630                 CERROR("can not do post setup in obd %p rc=%d", obd, rc);
 631
 632         RETURN(rc);
 633 }
 634
 635 static int fsfilt_smfs_post_cleanup(struct obd_device *obd,
 636                                     struct vfsmount *mnt)
 637 {
 638         struct super_block *sb = NULL;
 639         int rc = 0;
 640         ENTRY;
 641
 642         if (mnt) {
 643                 sb = mnt->mnt_sb;
 644                 if (SMFS_DO_REC(S2SMI(sb)))
 645                         rc = smfs_stop_rec(sb);
 646 #if CONFIG_SNAPFS
 647                 if (SMFS_DO_COW(S2SMI(sb)))
 648                         rc = smfs_stop_cow(sb);
 649 #endif
 650                 smfs_post_cleanup(sb);
 651         }
 652         RETURN(rc);
 653 }
 654
 655 static int fsfilt_smfs_set_fs_flags(struct inode *inode, int flags)
 656 {
 657         int rc = 0;
 658         ENTRY;
 659
 660         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && (flags & SM_DO_REC))
 661                 SMFS_SET_INODE_REC(inode);
 662         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && (flags & SM_DO_COW))
 663                 SMFS_SET_INODE_COW(inode);
 664         RETURN(rc);
 665 }
 666
 667 static int fsfilt_smfs_clear_fs_flags(struct inode *inode, int flags)
 668 {
 669         int rc = 0;
 670         ENTRY;
 671
 672         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && (flags & SM_DO_REC))
 673                 SMFS_CLEAN_INODE_REC(inode);
 674         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && (flags & SM_DO_COW))
 675                 SMFS_CLEAN_INODE_COW(inode);
 676         RETURN(rc);
 677 }
 678
 679 static int fsfilt_smfs_get_fs_flags(struct dentry *de)
 680 {
 681         struct inode *inode = de->d_inode;
 682         int flags = 0;
 683         ENTRY;
 684
 685         LASSERT(inode);
 686
 687         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && SMFS_DO_INODE_REC(inode))
 688                 flags |= SM_DO_REC;
 689         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && SMFS_DO_INODE_COW(inode))
 690                 flags |= SM_DO_COW;
 691
 692         RETURN(flags);
 693 }
 694 static int fsfilt_smfs_set_ost_flags(struct super_block *sb)
 695 {
 696         int rc = 0;
 697         SET_REC_PACK_TYPE_INDEX(S2SMI(sb)->smsi_flags, PACK_OST);
 698         RETURN(rc);
 699 }
 700
 701 static int fsfilt_smfs_set_mds_flags(struct super_block *sb)
 702 {
 703         int rc = 0;
 704         SET_REC_PACK_TYPE_INDEX(S2SMI(sb)->smsi_flags, PACK_MDS);
 705         RETURN(rc);
 706 }
 707
 708 static int fsfilt_smfs_get_reint_log_ctxt(struct super_block *sb,
 709                                           struct llog_ctxt **ctxt)
 710 {
 711         struct smfs_super_info *smfs_info = S2SMI(sb);
 712         int rc = 0;
 713
 714         *ctxt = smfs_info->smsi_rec_log;
 715         RETURN(rc);
 716 }
 717
 718 static int fsfilt_smfs_setup(struct obd_device *obd, struct super_block *sb)
 719 {
 720         struct smfs_super_info *smfs_info = S2SMI(sb);
 721         struct fsfilt_operations *cache_fsfilt;
 722         struct super_block *csb;
 723         int rc = 0;
 724
 725         /* It should be initialized olready by smfs_read_super(). */
 726         if (!(cache_fsfilt = smfs_info->sm_cache_fsfilt))
 727                     cache_fsfilt = fsfilt_get_ops(smfs_info->smsi_cache_ftype);
 728
 729         if (!cache_fsfilt)
 730                 RETURN(-ENOENT);
 731
 732         csb = S2CSB(sb);
 733         if (cache_fsfilt->fs_setup)
 734                 rc = cache_fsfilt->fs_setup(obd, csb);
 735
 736         duplicate_sb(sb, csb);
 737
 738         RETURN(rc);
 739 }
 740
 741 static int fsfilt_smfs_set_xattr(struct inode *inode, void *handle, char *name,
 742                                  void *buffer, int buffer_size)
 743 {
 744         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 745         struct  inode *cache_inode = NULL;
 746         int     rc = -EIO;
 747
 748         if (!cache_fsfilt)
 749                 RETURN(rc);
 750
 751         cache_inode = I2CI(inode);
 752         if (!cache_inode)
 753                 RETURN(rc);
 754
 755         pre_smfs_inode(inode, cache_inode);
 756
 757         if (cache_fsfilt->fs_set_xattr)
 758                 rc = cache_fsfilt->fs_set_xattr(cache_inode, handle, name,
 759                                                 buffer, buffer_size);
 760         post_smfs_inode(inode, cache_inode);
 761
 762         RETURN(rc);
 763 }
 764
 765 static int fsfilt_smfs_get_xattr(struct inode *inode, char *name,
 766                                  void *buffer, int buffer_size)
 767 {
 768         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 769         struct inode *cache_inode = NULL;
 770         int    rc = -EIO;
 771
 772         if (!cache_fsfilt)
 773                 RETURN(rc);
 774
 775         cache_inode = I2CI(inode);
 776         if (!cache_inode)
 777                 RETURN(rc);
 778
 779         pre_smfs_inode(inode, cache_inode);
 780
 781         if (cache_fsfilt->fs_get_xattr)
 782                 rc = cache_fsfilt->fs_get_xattr(cache_inode, name,
 783                                                 buffer, buffer_size);
 784         post_smfs_inode(inode, cache_inode);
 785
 786         RETURN(rc);
 787 }
 788
 789 static int fsfilt_smfs_insert_extents_ea(struct inode *inode,
 790                                          unsigned long from, unsigned long num)
 791 {
 792         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 793         struct inode *cache_inode = NULL;
 794         int    rc = -EIO;
 795
 796         if (!cache_fsfilt)
 797                 RETURN(rc);
 798
 799         cache_inode = I2CI(inode);
 800         if (!cache_inode)
 801                 RETURN(rc);
 802
 803         pre_smfs_inode(inode, cache_inode);
 804
 805         if (cache_fsfilt->fs_insert_extents_ea)
 806                 rc = cache_fsfilt->fs_insert_extents_ea(cache_inode, from, num);
 807
 808         post_smfs_inode(inode, cache_inode);
 809         return rc;
 810 }
 811
 812 static int fsfilt_smfs_remove_extents_ea(struct inode *inode,
 813                                          unsigned long from, unsigned long num)
 814 {
 815         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 816         struct inode *cache_inode = NULL;
 817         int    rc = -EIO;
 818
 819         if (!cache_fsfilt)
 820                 RETURN(rc);
 821
 822         cache_inode = I2CI(inode);
 823         if (!cache_inode)
 824                 RETURN(rc);
 825
 826         pre_smfs_inode(inode, cache_inode);
 827
 828         if (cache_fsfilt->fs_remove_extents_ea)
 829                 rc = cache_fsfilt->fs_remove_extents_ea(cache_inode, from, num);
 830
 831         post_smfs_inode(inode, cache_inode);
 832         return rc;
 833 }
 834
 835 static int fsfilt_smfs_init_extents_ea(struct inode *inode)
 836 {
 837         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 838         struct inode *cache_inode = NULL;
 839         int    rc = -EIO;
 840
 841         if (!cache_fsfilt)
 842                 RETURN(rc);
 843
 844         cache_inode = I2CI(inode);
 845         if (!cache_inode)
 846                 RETURN(rc);
 847
 848         pre_smfs_inode(inode, cache_inode);
 849
 850         if (cache_fsfilt->fs_init_extents_ea)
 851                 rc = cache_fsfilt->fs_init_extents_ea(cache_inode);
 852
 853         post_smfs_inode(inode, cache_inode);
 854         return rc;
 855 }
 856
 857 static int fsfilt_smfs_free_extents(struct super_block *sb, ino_t ino,
 858                                     char *pbuf, int size)
 859 {
 860         OBD_FREE(pbuf, size * (sizeof(struct ldlm_extent)));
 861         return 0;
 862 }
 863
 864 static int fsfilt_smfs_write_extents(struct dentry *dentry,
 865                                      unsigned long from, unsigned long num)
 866 {
 867         int rc = 0;
 868
 869         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 870                 rc = smfs_write_extents(dentry->d_inode, dentry, from, num);
 871
 872         return rc;
 873 }
 874
 875 static int fsfilt_smfs_precreate_rec(struct dentry *dentry, int *count,
 876                                      struct obdo *oa)
 877 {
 878         int rc = 0;
 879
 880         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 881                 rc = smfs_rec_precreate(dentry, count, oa);
 882
 883         return rc;
 884 }
 885
 886 static int fsfilt_smfs_get_ino_write_extents(struct super_block *sb, ino_t ino,
 887                                              char **pbuf, int *size)
 888 {
 889         struct fs_extent *fs_extents;
 890         struct ldlm_extent *extents = NULL;
 891         struct inode *inode;
 892         struct inode *cache_inode;
 893         struct fsfilt_operations *cache_fsfilt = NULL;
 894         struct lvfs_run_ctxt saved;
 895         int    rc = 0, fs_ex_size, ex_num, flags;
 896         char   *buf = NULL, *ex_buf = NULL;
 897
 898         push_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 899
 900         inode = iget(sb, ino);
 901
 902         if (!inode || is_bad_inode(inode)) {
 903                 CWARN("Can not get inode %lu ino\n", ino);
 904                 GOTO(out, rc = 0);
 905         }
 906         cache_inode = I2CI(inode);
 907         cache_fsfilt = I2FOPS(inode);
 908
 909         rc = cache_fsfilt->fs_get_xattr(cache_inode, REINT_EXTENTS_FLAGS,
 910                                         &flags, sizeof(int));
 911         if (!(flags & SMFS_OVER_WRITE) && !(flags & SMFS_DIRTY_WRITE)) {
 912                 GOTO(out, rc = 0);
 913         } else if (flags & SMFS_OVER_WRITE) {
 914                 *size = 1;
 915                 OBD_ALLOC(ex_buf, sizeof(struct ldlm_extent));
 916                 if (!ex_buf)
 917                         GOTO(out, rc=-ENOMEM);
 918                 extents = (struct ldlm_extent*)(ex_buf);
 919                 extents->start = 0;
 920                 extents->end = 0xffffffff;
 921         }
 922         if (rc < 0)
 923                 GOTO(out, rc);
 924         rc = cache_fsfilt->fs_get_write_extents_num(cache_inode, &fs_ex_size);
 925         if (rc)
 926                 GOTO(out, rc);
 927         OBD_ALLOC(buf, fs_ex_size);
 928         if (!buf)
 929                 GOTO(out, rc=-ENOMEM);
 930
 931         rc = cache_fsfilt->fs_get_inode_write_extents(cache_inode, &buf,
 932                                                       &fs_ex_size);
 933         if (rc < 0)
 934                 GOTO(out, rc);
 935         rc = 0;
 936         ex_num = fs_ex_size / sizeof(struct fs_extent);
 937         *size =  ex_num;
 938         OBD_ALLOC(ex_buf, ex_num* sizeof(struct ldlm_extent));
 939         if (!ex_buf)
 940                 GOTO(out, rc=-ENOMEM);
 941
 942         fs_extents = (struct fs_extent*)(buf);
 943         extents = (struct ldlm_extent*)(ex_buf);
 944         while (ex_num > 0) {
 945                 int blk_size = I2CI(inode)->i_blksize;
 946
 947                 extents->start = fs_extents->e_block * blk_size;
 948                 extents->end = extents->start + fs_extents->e_num * blk_size;
 949                 fs_extents++;
 950                 extents++;
 951                 ex_num--;
 952         }
 953         *pbuf = ex_buf;
 954 out:
 955         iput(inode);
 956         if (buf)
 957                 OBD_FREE(buf, fs_ex_size);
 958         if (rc && extents)
 959                 OBD_FREE(ex_buf, (*size) * (sizeof(struct ldlm_extent)));
 960         pop_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 961         return rc;
 962 }
 963
 964 static int fsfilt_smfs_set_snap_item(struct super_block *sb, char *name)
 965 {
 966         int rc = 0;
 967
 968         ENTRY;
 969 #if CONFIG_SNAPFS
 970         rc = smfs_add_snap_item(sb, name);
 971 #endif
 972         RETURN(rc);
 973 }
 974 static int fsfilt_smfs_do_write_cow(struct dentry *de, void *extents,
 975                                     int num_extents)
 976 {
 977         int rc = 0;
 978 #if CONFIG_SNAPFS
 979         struct write_extents *w_ext = (struct write_extents *)extents;
 980         int i = 0;
 981         ENTRY;
 982         for (i = 0; i < num_extents; i++) {
 983                size_t count = w_ext->w_count;
 984                loff_t off = w_ext->w_pos;
 985                rc = smfs_cow_write(de->d_inode, de, &count, &off);
 986                if (rc)
 987                         RETURN(rc);
 988                w_ext ++;
 989         }
 990 #endif
 991         RETURN(rc);
 992 }
 993 static struct fsfilt_operations fsfilt_smfs_ops = {
 994         .fs_type                = "smfs",
 995         .fs_owner               = THIS_MODULE,
 996         .fs_start               = fsfilt_smfs_start,
 997         .fs_brw_start           = fsfilt_smfs_brw_start,
 998         .fs_commit              = fsfilt_smfs_commit,
 999         .fs_commit_async        = fsfilt_smfs_commit_async,
1000         .fs_commit_wait         = fsfilt_smfs_commit_wait,
1001         .fs_setattr             = fsfilt_smfs_setattr,
1002         .fs_iocontrol           = fsfilt_smfs_iocontrol,
1003         .fs_set_md              = fsfilt_smfs_set_md,
1004         .fs_get_md              = fsfilt_smfs_get_md,
1005         .fs_readpage            = fsfilt_smfs_readpage,
1006         .fs_getpage             = fsfilt_smfs_getpage,
1007         .fs_add_journal_cb      = fsfilt_smfs_add_journal_cb,
1008         .fs_statfs              = fsfilt_smfs_statfs,
1009         .fs_sync                = fsfilt_smfs_sync,
1010         .fs_map_inode_pages     = fsfilt_smfs_map_inode_pages,
1011         .fs_prep_san_write      = fsfilt_smfs_prep_san_write,
1012         .fs_write_record        = fsfilt_smfs_write_record,
1013         .fs_read_record         = fsfilt_smfs_read_record,
1014         .fs_setup               = fsfilt_smfs_setup,
1015         .fs_post_setup          = fsfilt_smfs_post_setup,
1016         .fs_post_cleanup        = fsfilt_smfs_post_cleanup,
1017         .fs_set_fs_flags       = fsfilt_smfs_set_fs_flags,
1018         .fs_clear_fs_flags     = fsfilt_smfs_clear_fs_flags,
1019         .fs_get_fs_flags       = fsfilt_smfs_get_fs_flags,
1020         .fs_set_ost_flags       = fsfilt_smfs_set_ost_flags,
1021         .fs_set_mds_flags       = fsfilt_smfs_set_mds_flags,
1022         .fs_precreate_rec       = fsfilt_smfs_precreate_rec,
1023         .fs_get_reint_log_ctxt  = fsfilt_smfs_get_reint_log_ctxt,
1024         .fs_send_bio            = fsfilt_smfs_send_bio,
1025         .fs_set_xattr           = fsfilt_smfs_set_xattr,
1026         .fs_get_xattr           = fsfilt_smfs_get_xattr,
1027         .fs_init_extents_ea     = fsfilt_smfs_init_extents_ea,
1028         .fs_insert_extents_ea   = fsfilt_smfs_insert_extents_ea,
1029         .fs_remove_extents_ea   = fsfilt_smfs_remove_extents_ea,
1030         .fs_get_ino_write_extents = fsfilt_smfs_get_ino_write_extents,
1031         .fs_free_write_extents  = fsfilt_smfs_free_extents,
1032         .fs_write_extents       = fsfilt_smfs_write_extents,
1033         .fs_set_snap_item       = fsfilt_smfs_set_snap_item,
1034         .fs_do_write_cow        = fsfilt_smfs_do_write_cow,
1035         /* FIXME-UMKA: probably fsfilt_smfs_get_op_len() should be
1036          * put here too. */
1037 };
1038
1039 static int __init fsfilt_smfs_init(void)
1040 {
1041         int rc;
1042
1043         rc = fsfilt_register_ops(&fsfilt_smfs_ops);
1044         return rc;
1045 }
1046
1047 static void __exit fsfilt_smfs_exit(void)
1048 {
1049         fsfilt_unregister_ops(&fsfilt_smfs_ops);
1050 }
1051
1052 module_init(fsfilt_smfs_init);
1053 module_exit(fsfilt_smfs_exit);
1054
1055 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1056 MODULE_DESCRIPTION("Lustre SMFS Filesystem Helper v0.1");
1057 MODULE_LICENSE("GPL");