lustre/smfs/fsfilt.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_SM
  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 <libcfs/kp30.h>
  35 #include <linux/obd.h>
  36 #include <linux/obd_class.h>
  37
  38 #include <linux/lustre_fsfilt.h>
  39 #include <linux/lustre_smfs.h>
  40 #include <linux/lustre_snap.h>
  41
  42 #include "smfs_internal.h"
  43
  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         int extra = 0;
  51         int opcode = op;
  52
  53         if (cache_fsfilt == NULL)
  54                 return NULL;
  55
  56         if (!cache_fsfilt->fs_start)
  57                 return ERR_PTR(-ENOSYS);
  58
  59         //opcode can be changed here.
  60         //For example, unlink is rename in nature for undo plugin
  61         extra = SMFS_PLG_HELP(inode->i_sb, PLG_TRANS_SIZE, &opcode);
  62
  63         handle = cache_fsfilt->fs_start(cache_inode, op, desc_private,
  64                                         logs + extra);
  65
  66         return handle;
  67 }
  68
  69 static void *fsfilt_smfs_brw_start(int objcount, struct fsfilt_objinfo *fso,
  70                                    int niocount, struct niobuf_local *nb,
  71                                    void *desc_private, int logs)
  72 {
  73         struct fsfilt_operations *cache_fsfilt;
  74         struct dentry *cache_dentry = NULL;
  75         struct inode *cache_inode = NULL;
  76         struct fsfilt_objinfo cache_fso;
  77         void   *rc = NULL;
  78
  79         ENTRY;
  80
  81         cache_fsfilt = I2FOPS(fso->fso_dentry->d_inode);
  82         if (cache_fsfilt == NULL)
  83                 RETURN(NULL);
  84
  85         cache_inode = I2CI(fso->fso_dentry->d_inode);
  86         cache_dentry = pre_smfs_dentry(NULL, cache_inode, fso->fso_dentry);
  87         if (!cache_dentry)
  88                 RETURN(ERR_PTR(-ENOMEM));
  89
  90         cache_fso.fso_dentry = cache_dentry;
  91         cache_fso.fso_bufcnt = fso->fso_bufcnt;
  92
  93         if (!cache_fsfilt->fs_brw_start) {
  94                 rc =  ERR_PTR(-ENOSYS);
  95                 goto exit;
  96         }
  97
  98         rc = cache_fsfilt->fs_brw_start(objcount, &cache_fso, niocount, nb,
  99                                         desc_private, logs);
 100 exit:
 101         post_smfs_dentry(cache_dentry);
 102         RETURN(rc);
 103 }
 104
 105 /* FIXME-WANGDI: here we can easily have inode == NULL due to
 106    mds_open() behavior. It passes NULL inode to mds_finish_transno()
 107    sometimes. Probably we should have spare way to get cache fsfilt
 108    operations. */
 109 static int fsfilt_smfs_commit(struct super_block *sb, struct inode *inode,
 110                               void *h, int force_sync)
 111 {
 112         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 113         struct super_block *csb = S2CSB(sb);
 114         struct inode *cache_inode = NULL;
 115         int    rc = -EIO;
 116
 117         ENTRY;
 118
 119         if (inode)
 120                 cache_inode = I2CI(inode);
 121
 122         if (cache_fsfilt == NULL)
 123                 RETURN(rc);
 124
 125         if (!cache_fsfilt->fs_commit)
 126                 RETURN(-ENOSYS);
 127
 128         rc = cache_fsfilt->fs_commit(csb, cache_inode, h, force_sync);
 129
 130         RETURN(rc);
 131 }
 132
 133 static int fsfilt_smfs_commit_async(struct inode *inode, void *h,
 134                                     void **wait_handle)
 135 {
 136         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 137         struct inode *cache_inode = NULL;
 138         int    rc = -EIO;
 139
 140         cache_inode = I2CI(inode);
 141         if (cache_fsfilt == NULL)
 142                 RETURN(-EINVAL);
 143
 144         if (!cache_fsfilt->fs_commit_async)
 145                 RETURN(-ENOSYS);
 146
 147         rc = cache_fsfilt->fs_commit_async(cache_inode, h, wait_handle);
 148
 149         RETURN(rc);
 150 }
 151
 152 static int fsfilt_smfs_commit_wait(struct inode *inode, void *h)
 153 {
 154         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 155         struct inode *cache_inode = NULL;
 156         int    rc = -EIO;
 157
 158         cache_inode = I2CI(inode);
 159         if (cache_fsfilt == NULL)
 160                 RETURN(-EINVAL);
 161
 162         if (!cache_fsfilt->fs_commit_wait)
 163                 RETURN(-ENOSYS);
 164
 165         rc = cache_fsfilt->fs_commit_wait(cache_inode, h);
 166
 167         RETURN(rc);
 168 }
 169
 170 static int fsfilt_smfs_iocontrol(struct inode *inode, struct file *file,
 171                                  unsigned int cmd, unsigned long arg)
 172 {
 173         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 174         struct inode *cache_inode = I2CI(inode);
 175         struct smfs_file_info *sfi = NULL;
 176         struct file * cache_file = NULL;
 177         int    rc = -EIO;
 178         ENTRY;
 179
 180         if (!cache_fsfilt || !cache_inode)
 181                 RETURN(rc);
 182
 183         if (!cache_fsfilt->fs_iocontrol)
 184                 RETURN(-ENOSYS);
 185
 186
 187         if (file != NULL) {
 188                 sfi = F2SMFI(file);
 189                 if (sfi->magic != SMFS_FILE_MAGIC)
 190                         BUG();
 191                 cache_file = sfi->c_file;
 192         }
 193
 194         pre_smfs_inode(inode, cache_inode);
 195
 196         rc = cache_fsfilt->fs_iocontrol(cache_inode, cache_file, cmd, arg);
 197
 198         post_smfs_inode(inode, cache_inode);
 199
 200         RETURN(rc);
 201 }
 202
 203 static int fsfilt_smfs_send_bio(int rw, struct inode *inode, void *bio)
 204 {
 205         struct inode *cache_inode;
 206         struct fsfilt_operations *cache_fsfilt;
 207
 208         ENTRY;
 209
 210         cache_fsfilt = I2FOPS(inode);
 211         if (!cache_fsfilt)
 212                 RETURN(-EINVAL);
 213
 214         cache_inode = I2CI(inode);
 215         if (!cache_inode)
 216                 RETURN(-EINVAL);
 217
 218         if (!cache_fsfilt->fs_send_bio)
 219                 RETURN(-ENOSYS);
 220
 221         return cache_fsfilt->fs_send_bio(rw, cache_inode, bio);
 222 }
 223
 224 static struct page * fsfilt_smfs_getpage(struct inode *inode, long int index)
 225 {
 226         struct  fsfilt_operations *cache_fsfilt;
 227         struct  inode *cache_inode;
 228         ENTRY;
 229         cache_fsfilt = I2FOPS(inode);
 230         if (!cache_fsfilt)
 231                 RETURN(ERR_PTR(-EINVAL));
 232
 233         cache_inode = I2CI(inode);
 234         if (!cache_inode)
 235                 RETURN(ERR_PTR(-EINVAL));
 236
 237         if (!cache_fsfilt->fs_getpage)
 238                 RETURN(ERR_PTR(-ENOSYS));
 239 #if CONFIG_SNAPFS
 240         if (SMFS_DO_COW(S2SMI(inode->i_sb))) {
 241                 struct address_space_operations *aops =
 242                                 cache_inode->i_mapping->a_ops;
 243                 if (aops->bmap(cache_inode->i_mapping, index)) {
 244                         struct inode *ind_inode = NULL;
 245                         struct inode *cache_ind = NULL;
 246                         struct page  *page = NULL;
 247
 248                         ind_inode = smfs_cow_get_ind(inode, index);
 249                         if (!ind_inode) {
 250                                 RETURN(ERR_PTR(-EIO));
 251                         }
 252                         cache_ind = I2CI(ind_inode);
 253                         /*FIXME cow inode should be bottom fs inode */
 254                         page = cache_fsfilt->fs_getpage(cache_ind, index);
 255                         iput(ind_inode);
 256                         RETURN(page);
 257                 }
 258         }
 259 #endif
 260         return cache_fsfilt->fs_getpage(cache_inode, index);
 261 }
 262
 263 static ssize_t fsfilt_smfs_readpage(struct file *file, char *buf,
 264                                     size_t count, loff_t *off)
 265 {
 266         struct fsfilt_operations *cache_fsfilt;
 267         struct smfs_file_info *sfi;
 268         struct inode *cache_inode;
 269         loff_t tmp_ppos;
 270         loff_t *cache_ppos;
 271         ssize_t rc = -EIO;
 272
 273         ENTRY;
 274
 275         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 276         if (!cache_fsfilt)
 277                 RETURN(rc);
 278
 279         cache_inode = I2CI(file->f_dentry->d_inode);
 280         if (!cache_inode)
 281                 RETURN(rc);
 282
 283         sfi = F2SMFI(file);
 284         if (sfi->magic != SMFS_FILE_MAGIC)
 285                 BUG();
 286
 287         if (off != &(file->f_pos))
 288                 cache_ppos = &tmp_ppos;
 289         else
 290                 cache_ppos = &sfi->c_file->f_pos;
 291         *cache_ppos = *off;
 292
 293         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 294 #if CONFIG_SNAPFS
 295         /*readdir page*/
 296         if (smfs_dotsnap_inode(file->f_dentry->d_inode)) {
 297                 struct fsfilt_operations *snapops =
 298                                         I2SNAPOPS(file->f_dentry->d_inode);
 299
 300                 LASSERT(S_ISDIR(file->f_dentry->d_inode->i_mode));
 301
 302                 rc = snapops->fs_read_dotsnap_dir_page(sfi->c_file, buf, count,
 303                                                        cache_ppos);
 304         } else {
 305                 if (cache_fsfilt->fs_readpage)
 306                         rc = cache_fsfilt->fs_readpage(sfi->c_file, buf, count,
 307                                                        cache_ppos);
 308         }
 309 #else
 310         if (cache_fsfilt->fs_readpage)
 311                 rc = cache_fsfilt->fs_readpage(sfi->c_file, buf, count,
 312                                                cache_ppos);
 313
 314 #endif
 315         *off = *cache_ppos;
 316         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 317         duplicate_file(file, sfi->c_file);
 318
 319         RETURN(rc);
 320 }
 321
 322
 323 static int fsfilt_smfs_add_journal_cb(struct obd_device *obd,
 324                                       struct super_block *sb, __u64 last_rcvd,
 325                                       void *handle, fsfilt_cb_t cb_func,
 326                                       void *cb_data)
 327 {
 328         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 329         struct super_block *csb = S2CSB(sb);
 330         int rc = -EIO;
 331
 332         ENTRY;
 333
 334         if (!cache_fsfilt)
 335                  RETURN(rc);
 336         if (cache_fsfilt->fs_add_journal_cb)
 337                 rc = cache_fsfilt->fs_add_journal_cb(obd, csb, last_rcvd,
 338                                                      handle, cb_func, cb_data);
 339         RETURN(rc);
 340 }
 341
 342 static int fsfilt_smfs_statfs(struct super_block *sb, struct obd_statfs *osfs)
 343 {
 344         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 345         struct super_block *csb = S2CSB(sb);
 346         int rc = -EIO;
 347
 348         ENTRY;
 349
 350         if (!cache_fsfilt)
 351                 RETURN(rc);
 352
 353         if (!cache_fsfilt->fs_statfs)
 354                 RETURN(-ENOSYS);
 355
 356         rc = cache_fsfilt->fs_statfs(csb, osfs);
 357         duplicate_sb(csb, sb);
 358
 359         RETURN(rc);
 360 }
 361
 362 static int fsfilt_smfs_sync(struct super_block *sb)
 363 {
 364         struct fsfilt_operations *cache_fsfilt = S2SMI(sb)->sm_cache_fsfilt;
 365         struct super_block *csb = S2CSB(sb);
 366         int    rc = -ENOSYS;
 367
 368         if (!cache_fsfilt)
 369                 RETURN(-EINVAL);
 370
 371         if (cache_fsfilt->fs_sync)
 372                 rc = cache_fsfilt->fs_sync(csb);
 373
 374         RETURN(rc);
 375 }
 376
 377 int fsfilt_smfs_map_inode_pages(struct inode *inode, struct page **page,
 378                                 int pages, unsigned long *blocks, int *created,
 379                                 int create, struct semaphore *sem)
 380 {
 381         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 382         struct  inode *cache_inode = NULL;
 383         int     rc = -EIO;
 384
 385         ENTRY;
 386
 387         if (!cache_fsfilt)
 388                 RETURN(-EINVAL);
 389
 390         cache_inode = I2CI(inode);
 391
 392         if (!cache_inode)
 393                 RETURN(rc);
 394
 395         if (!cache_fsfilt->fs_map_inode_pages)
 396                 RETURN(-ENOSYS);
 397
 398         down(&cache_inode->i_sem);
 399
 400         rc = cache_fsfilt->fs_map_inode_pages(cache_inode, page, pages, blocks,
 401                                               created, create, sem);
 402         up(&cache_inode->i_sem);
 403
 404         RETURN(rc);
 405 }
 406
 407 static int fsfilt_smfs_prep_san_write(struct inode *inode, long *blocks,
 408                                       int nblocks, loff_t newsize)
 409 {
 410         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 411         struct  inode *cache_inode = NULL;
 412         int     rc = -EIO;
 413
 414         if (!cache_fsfilt)
 415                 RETURN(-EINVAL);
 416
 417         cache_inode = I2CI(inode);
 418
 419         if (!cache_inode)
 420                 RETURN(-EINVAL);
 421
 422         if (!cache_fsfilt->fs_prep_san_write)
 423                 RETURN(-ENOSYS);
 424
 425         down(&cache_inode->i_sem);
 426         rc = cache_fsfilt->fs_prep_san_write(cache_inode, blocks, nblocks,
 427                                              newsize);
 428         up(&cache_inode->i_sem);
 429
 430         RETURN(rc);
 431 }
 432
 433 static int fsfilt_smfs_read_record(struct file * file, void *buf,
 434                                    int size, loff_t *offs)
 435 {
 436         struct  fsfilt_operations *cache_fsfilt;
 437         struct  inode *cache_inode;
 438         struct  smfs_file_info *sfi;
 439         loff_t  tmp_ppos;
 440         loff_t  *cache_ppos;
 441         ssize_t rc;
 442
 443         ENTRY;
 444         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 445         if (!cache_fsfilt)
 446                 RETURN(-EINVAL);
 447
 448         cache_inode = I2CI(file->f_dentry->d_inode);
 449
 450         if (!cache_inode)
 451                 RETURN(-EINVAL);
 452
 453         sfi = F2SMFI(file);
 454         if (sfi->magic != SMFS_FILE_MAGIC) BUG();
 455
 456         if (offs != &(file->f_pos))
 457                 cache_ppos = &tmp_ppos;
 458         else
 459                 cache_ppos = &sfi->c_file->f_pos;
 460         *cache_ppos = *offs;
 461
 462         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 463
 464         if (!cache_fsfilt->fs_read_record)
 465                 RETURN(-ENOSYS);
 466
 467         rc = cache_fsfilt->fs_read_record(sfi->c_file, buf, size, cache_ppos);
 468
 469         *offs = *cache_ppos;
 470         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 471         duplicate_file(file, sfi->c_file);
 472
 473         RETURN(rc);
 474 }
 475
 476 static int fsfilt_smfs_write_record(struct file *file, void *buf, int bufsize,
 477                                     loff_t *offs, int force_sync)
 478 {
 479         struct  fsfilt_operations *cache_fsfilt;
 480         struct  inode *cache_inode;
 481         struct  smfs_file_info *sfi;
 482         loff_t  tmp_ppos;
 483         loff_t  *cache_ppos;
 484         ssize_t rc = -EIO;
 485
 486         ENTRY;
 487
 488         cache_fsfilt = I2FOPS(file->f_dentry->d_inode);
 489         if (!cache_fsfilt)
 490                 RETURN(-EINVAL);
 491
 492         cache_inode = I2CI(file->f_dentry->d_inode);
 493
 494         if (!cache_inode)
 495                 RETURN(-EINVAL);
 496
 497         sfi = F2SMFI(file);
 498         if (sfi->magic != SMFS_FILE_MAGIC)
 499                 BUG();
 500
 501         if (offs != &(file->f_pos))
 502                 cache_ppos = &tmp_ppos;
 503         else
 504                 cache_ppos = &sfi->c_file->f_pos;
 505         *cache_ppos = *offs;
 506
 507         pre_smfs_inode(file->f_dentry->d_inode, cache_inode);
 508
 509         if (!cache_fsfilt->fs_write_record)
 510                 RETURN(-ENOSYS);
 511
 512         rc = cache_fsfilt->fs_write_record(sfi->c_file, buf,
 513                                            bufsize, cache_ppos, force_sync);
 514         *offs = *cache_ppos;
 515         post_smfs_inode(file->f_dentry->d_inode, cache_inode);
 516         duplicate_file(file, sfi->c_file);
 517
 518         RETURN(rc);
 519 }
 520
 521 static int fsfilt_smfs_post_setup(struct obd_device *obd, struct vfsmount *mnt,
 522                                   struct dentry *root_dentry)
 523 {
 524         struct super_block *sb = NULL;
 525         int rc = 0;
 526
 527         ENTRY;
 528
 529         if (mnt) {
 530                 sb = mnt->mnt_sb;
 531
 532                 if (obd)
 533                         S2SMI(sb)->smsi_exp = obd->obd_self_export;
 534
 535                 rc = smfs_post_setup(obd, mnt, root_dentry);
 536                 if (rc) {
 537                         CERROR("post_setup fails in obd %p rc=%d", obd, rc);
 538                 }
 539
 540
 541         }
 542
 543         RETURN(rc);
 544 }
 545
 546 static int fsfilt_smfs_post_cleanup(struct obd_device *obd,
 547                                     struct vfsmount *mnt)
 548 {
 549         struct super_block *sb = NULL;
 550         int rc = 0;
 551         ENTRY;
 552
 553         if (mnt) {
 554                 sb = mnt->mnt_sb;
 555                 smfs_post_cleanup(sb);
 556         }
 557
 558         RETURN(rc);
 559 }
 560
 561 static int fsfilt_smfs_set_fs_flags(struct inode *inode, int flags)
 562 {
 563         int rc = 0;
 564         ENTRY;
 565
 566         if (flags & SM_ALL_PLG) /* enable all plugins */
 567                 SMFS_SET(I2SMI(inode)->smi_flags, SMFS_PLG_ALL);
 568         if (flags & SM_PRECREATE) /* disable logs for precreated objs */
 569                 SMFS_CLEAR(I2SMI(inode)->smi_flags, SMFS_PLG_ALL);
 570
 571
 572 #if 0
 573         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && (flags & SM_DO_COW))
 574                 SMFS_SET_INODE_COW(inode);
 575 #endif
 576         RETURN(rc);
 577 }
 578
 579 static int fsfilt_smfs_clear_fs_flags(struct inode *inode, int flags)
 580 {
 581         int rc = 0;
 582         ENTRY;
 583         /*
 584         if (SMFS_DO_REC(S2SMI(inode->i_sb)) && (flags & SM_DO_REC))
 585                 SMFS_CLEAN_INODE_REC(inode);
 586         if (SMFS_DO_COW(S2SMI(inode->i_sb)) && (flags & SM_DO_COW))
 587                 SMFS_CLEAN_INODE_COW(inode);
 588         */
 589         if(flags & SM_ALL_PLG) /* disable all plugins */
 590                 SMFS_CLEAR(I2SMI(inode)->smi_flags, SMFS_PLG_ALL);
 591         if (flags & SM_PRECREATE) /* enable log again */
 592                 SMFS_SET(I2SMI(inode)->smi_flags, SMFS_PLG_ALL);
 593
 594         RETURN(rc);
 595 }
 596
 597 static int fsfilt_smfs_get_fs_flags(struct dentry *de)
 598 {
 599         struct inode *inode = de->d_inode;
 600         int flags = 0;
 601         ENTRY;
 602
 603         LASSERT(inode);
 604
 605         flags = I2SMI(inode)->smi_flags & S2SMI(inode->i_sb)->plg_flags;
 606
 607         RETURN(flags);
 608 }
 609
 610 static int fsfilt_smfs_set_ost_flags(struct super_block *sb)
 611 {
 612         return 0;
 613 }
 614
 615 static int fsfilt_smfs_set_mds_flags(struct super_block *sb)
 616 {
 617         return 0;
 618 }
 619
 620 #if 0
 621 static int fsfilt_smfs_get_reint_log_ctxt(struct super_block *sb,
 622                                           struct llog_ctxt **ctxt)
 623 {
 624         struct smfs_super_info *smfs_info = S2SMI(sb);
 625         int rc = 0;
 626
 627         *ctxt = smfs_info->smsi_kml_log;
 628         RETURN(rc);
 629 }
 630 #endif
 631
 632 static int fsfilt_smfs_setup(struct obd_device *obd, struct super_block *sb)
 633 {
 634         struct smfs_super_info *smfs_info = S2SMI(sb);
 635         struct fsfilt_operations *cache_fsfilt;
 636         struct super_block *csb;
 637         int rc = 0;
 638
 639         ENTRY;
 640
 641         /* It should be initialized olready by smfs_read_super(). */
 642         if (!(cache_fsfilt = smfs_info->sm_cache_fsfilt))
 643                     cache_fsfilt = fsfilt_get_ops(smfs_info->smsi_cache_ftype);
 644
 645         if (!cache_fsfilt)
 646                 RETURN(-ENOENT);
 647
 648         csb = S2CSB(sb);
 649         if (cache_fsfilt->fs_setup)
 650                 rc = cache_fsfilt->fs_setup(obd, csb);
 651
 652         duplicate_sb(sb, csb);
 653
 654         RETURN(rc);
 655 }
 656
 657 static int fsfilt_smfs_setattr(struct dentry *dentry, void *handle,
 658                                struct iattr *iattr, int do_trunc)
 659 {
 660         struct fsfilt_operations *cache_fsfilt = I2FOPS(dentry->d_inode);
 661         struct dentry *cache_dentry = NULL;
 662         struct inode *cache_inode = I2CI(dentry->d_inode);
 663         struct hook_setattr_msg msg = {
 664                 .dentry = dentry,
 665                 .attr = iattr
 666         };
 667         int    rc = -EIO;
 668
 669         if (!cache_fsfilt)
 670                 RETURN(rc);
 671
 672         if (!cache_fsfilt->fs_setattr)
 673                 RETURN(-ENOSYS);
 674
 675         cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
 676         if (!cache_dentry)
 677                 RETURN(-ENOMEM);
 678
 679         pre_smfs_inode(dentry->d_inode, cache_inode);
 680
 681         SMFS_PRE_HOOK(dentry->d_inode, HOOK_F_SETATTR, &msg);
 682
 683         rc = cache_fsfilt->fs_setattr(cache_dentry, handle, iattr, do_trunc);
 684
 685         SMFS_POST_HOOK(dentry->d_inode, HOOK_F_SETATTR, &msg, rc);
 686         post_smfs_inode(dentry->d_inode, cache_inode);
 687
 688         post_smfs_dentry(cache_dentry);
 689         RETURN(rc);
 690 }
 691
 692 static int fsfilt_smfs_set_xattr(struct inode *inode, void *handle, char *name,
 693                                  void *buffer, int buffer_size)
 694 {
 695         struct  fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 696         struct  inode *cache_inode = NULL;
 697         int     rc = -EIO;
 698
 699         ENTRY;
 700
 701         if (!cache_fsfilt)
 702                 RETURN(rc);
 703
 704         cache_inode = I2CI(inode);
 705         if (!cache_inode)
 706                 RETURN(rc);
 707
 708         pre_smfs_inode(inode, cache_inode);
 709
 710         if (cache_fsfilt->fs_set_xattr)
 711                 rc = cache_fsfilt->fs_set_xattr(cache_inode, handle, name,
 712                                                 buffer, buffer_size);
 713         post_smfs_inode(inode, cache_inode);
 714
 715         RETURN(rc);
 716 }
 717
 718 static int fsfilt_smfs_get_xattr(struct inode *inode, char *name,
 719                                  void *buffer, int buffer_size)
 720 {
 721         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 722         struct inode *cache_inode = NULL;
 723         int    rc = -EIO;
 724
 725         if (!cache_fsfilt)
 726                 RETURN(rc);
 727
 728         cache_inode = I2CI(inode);
 729         if (!cache_inode)
 730                 RETURN(rc);
 731
 732         pre_smfs_inode(inode, cache_inode);
 733
 734         if (cache_fsfilt->fs_get_xattr)
 735                 rc = cache_fsfilt->fs_get_xattr(cache_inode, name,
 736                                                 buffer, buffer_size);
 737         post_smfs_inode(inode, cache_inode);
 738
 739         RETURN(rc);
 740 }
 741
 742 #define XATTR_LUSTRE_MDS_LOV_EA         "lov"
 743 #define XATTR_LUSTRE_MDS_MEA_EA         "mea"
 744 #define XATTR_LUSTRE_MDS_MID_EA         "mid"
 745 #define XATTR_LUSTRE_MDS_SID_EA         "sid"
 746
 747 static int fsfilt_smfs_set_md(struct inode *inode, void *handle,
 748                               void *lmm, int lmm_size, enum ea_type type)
 749 {
 750         int rc;
 751
 752         switch(type) {
 753         case EA_LOV:
 754                 rc = fsfilt_smfs_set_xattr(inode, handle,
 755                                            XATTR_LUSTRE_MDS_LOV_EA,
 756                                            lmm, lmm_size);
 757                 break;
 758         case EA_MEA:
 759                 rc = fsfilt_smfs_set_xattr(inode, handle,
 760                                            XATTR_LUSTRE_MDS_MEA_EA,
 761                                            lmm, lmm_size);
 762                 break;
 763         case EA_SID:
 764                 rc = fsfilt_smfs_set_xattr(inode, handle,
 765                                            XATTR_LUSTRE_MDS_SID_EA,
 766                                            lmm, lmm_size);
 767                 break;
 768         case EA_MID:
 769                 rc = fsfilt_smfs_set_xattr(inode, handle,
 770                                            XATTR_LUSTRE_MDS_MID_EA,
 771                                            lmm, lmm_size);
 772                 break;
 773         default:
 774                 rc = -EINVAL;
 775         }
 776
 777         return rc;
 778 }
 779
 780 static int fsfilt_smfs_get_md(struct inode *inode, void *lmm,
 781                               int lmm_size, enum ea_type type)
 782 {
 783         int rc;
 784
 785         switch (type) {
 786         case EA_LOV:
 787                 rc = fsfilt_smfs_get_xattr(inode,
 788                                            XATTR_LUSTRE_MDS_LOV_EA,
 789                                            lmm, lmm_size);
 790                 break;
 791         case EA_MEA:
 792                 rc = fsfilt_smfs_get_xattr(inode,
 793                                            XATTR_LUSTRE_MDS_MEA_EA,
 794                                            lmm, lmm_size);
 795                 break;
 796         case EA_SID:
 797                 rc = fsfilt_smfs_get_xattr(inode,
 798                                            XATTR_LUSTRE_MDS_SID_EA,
 799                                            lmm, lmm_size);
 800                 break;
 801         case EA_MID:
 802                 rc = fsfilt_smfs_get_xattr(inode,
 803                                            XATTR_LUSTRE_MDS_MID_EA,
 804                                            lmm, lmm_size);
 805                 break;
 806         default:
 807                 rc = -EINVAL;
 808         }
 809
 810         return rc;
 811 }
 812
 813 static int fsfilt_smfs_insert_extents_ea(struct inode *inode,
 814                                          unsigned long from, unsigned long num)
 815 {
 816         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 817         struct inode *cache_inode = NULL;
 818         int    rc = -EIO;
 819
 820         if (!cache_fsfilt)
 821                 RETURN(rc);
 822
 823         cache_inode = I2CI(inode);
 824         if (!cache_inode)
 825                 RETURN(rc);
 826
 827         pre_smfs_inode(inode, cache_inode);
 828
 829         if (cache_fsfilt->fs_insert_extents_ea)
 830                 rc = cache_fsfilt->fs_insert_extents_ea(cache_inode, from, num);
 831
 832         post_smfs_inode(inode, cache_inode);
 833         return rc;
 834 }
 835
 836 static int fsfilt_smfs_remove_extents_ea(struct inode *inode,
 837                                          unsigned long from, unsigned long num)
 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_remove_extents_ea)
 853                 rc = cache_fsfilt->fs_remove_extents_ea(cache_inode, from, num);
 854
 855         post_smfs_inode(inode, cache_inode);
 856         return rc;
 857 }
 858
 859 static int fsfilt_smfs_init_extents_ea(struct inode *inode)
 860 {
 861         struct fsfilt_operations *cache_fsfilt = I2FOPS(inode);
 862         struct inode *cache_inode = NULL;
 863         int    rc = -EIO;
 864         ENTRY;
 865
 866         if (!cache_fsfilt)
 867                 RETURN(rc);
 868
 869         cache_inode = I2CI(inode);
 870         if (!cache_inode)
 871                 RETURN(rc);
 872
 873         pre_smfs_inode(inode, cache_inode);
 874
 875         if (cache_fsfilt->fs_init_extents_ea)
 876                 rc = cache_fsfilt->fs_init_extents_ea(cache_inode);
 877
 878         post_smfs_inode(inode, cache_inode);
 879         return rc;
 880 }
 881
 882 static int fsfilt_smfs_free_extents(struct super_block *sb, ino_t ino,
 883                                     char *pbuf, int size)
 884 {
 885         OBD_FREE(pbuf, size * (sizeof(struct ldlm_extent)));
 886         return 0;
 887 }
 888
 889 static int fsfilt_smfs_write_extents(struct dentry *dentry,
 890                                      unsigned long from, unsigned long num)
 891 {
 892         int rc = 0;
 893         struct inode * cache_inode = I2CI(dentry->d_inode);
 894         struct hook_write_msg msg = {
 895                 .dentry = dentry,
 896                 .count = num,
 897                 .pos = from
 898         };
 899
 900         ENTRY;
 901
 902         /*TODO: fix this later
 903         pre_smfs_inode(dentry->d_inode, cache_inode);
 904
 905         SMFS_PRE_HOOK(dentry->d_inode, HOOK_WRITE, &msg);
 906
 907         rc = smfs_write_extents(dentry->d_inode, dentry, from, num);
 908         SMFS_POST_HOOK(dentry->d_inode, HOOK_WRITE, &msg, rc);
 909         post_smfs_inode(dentry->d_inode, cache_inode);
 910         */
 911
 912         RETURN(rc);
 913 }
 914
 915 static int fsfilt_smfs_precreate_rec(struct dentry *dentry, int *count,
 916                                      struct obdo *oa)
 917 {
 918         int rc = 0;
 919         /* Why to log precreate?? MDS will do this in any case
 920         if (SMFS_DO_REC(S2SMI(dentry->d_inode->i_sb)))
 921                 rc = smfs_rec_precreate(dentry, count, oa);
 922         */
 923         return rc;
 924 }
 925
 926 static int fsfilt_smfs_get_ino_write_extents(struct super_block *sb, ino_t ino,
 927                                              char **pbuf, int *size)
 928 {
 929         struct fs_extent *fs_extents;
 930         struct ldlm_extent *extents = NULL;
 931         struct inode *inode;
 932         struct inode *cache_inode;
 933         struct fsfilt_operations *cache_fsfilt = NULL;
 934         struct lvfs_run_ctxt saved;
 935         int    rc = 0, fs_ex_size, ex_num, flags;
 936         char   *buf = NULL, *ex_buf = NULL;
 937         ENTRY;
 938
 939         push_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
 940
 941         inode = iget(sb, ino);
 942
 943         if (!inode || is_bad_inode(inode)) {
 944                 CWARN("Can not get inode %lu ino\n", ino);
 945                 GOTO(out, rc = 0);
 946         }
 947         cache_inode = I2CI(inode);
 948         cache_fsfilt = I2FOPS(inode);
 949
 950         rc = cache_fsfilt->fs_get_xattr(cache_inode, REINT_EXTENTS_FLAGS,
 951                                         &flags, sizeof(int));
 952         if (!(flags & SMFS_OVER_WRITE) && !(flags & SMFS_DIRTY_WRITE)) {
 953                 GOTO(out, rc = 0);
 954         } else if (flags & SMFS_OVER_WRITE) {
 955                 *size = 1;
 956                 OBD_ALLOC(ex_buf, sizeof(struct ldlm_extent));
 957                 if (!ex_buf)
 958                         GOTO(out, rc=-ENOMEM);
 959                 extents = (struct ldlm_extent*)(ex_buf);
 960                 extents->start = 0;
 961                 extents->end = 0xffffffff;
 962         }
 963         if (rc < 0)
 964                 GOTO(out, rc);
 965         rc = cache_fsfilt->fs_get_write_extents_num(cache_inode, &fs_ex_size);
 966         if (rc)
 967                 GOTO(out, rc);
 968         OBD_ALLOC(buf, fs_ex_size);
 969         if (!buf)
 970                 GOTO(out, rc=-ENOMEM);
 971
 972         rc = cache_fsfilt->fs_get_inode_write_extents(cache_inode, &buf,
 973                                                       &fs_ex_size);
 974         if (rc < 0)
 975                 GOTO(out, rc);
 976         rc = 0;
 977         ex_num = fs_ex_size / sizeof(struct fs_extent);
 978         *size =  ex_num;
 979         OBD_ALLOC(ex_buf, ex_num* sizeof(struct ldlm_extent));
 980         if (!ex_buf)
 981                 GOTO(out, rc=-ENOMEM);
 982
 983         fs_extents = (struct fs_extent*)(buf);
 984         extents = (struct ldlm_extent*)(ex_buf);
 985         while (ex_num > 0) {
 986                 int blk_size = I2CI(inode)->i_blksize;
 987
 988                 extents->start = fs_extents->e_block * blk_size;
 989                 extents->end = extents->start + fs_extents->e_num * blk_size;
 990                 fs_extents++;
 991                 extents++;
 992                 ex_num--;
 993         }
 994         *pbuf = ex_buf;
 995 out:
 996         iput(inode);
 997         if (buf)
 998                 OBD_FREE(buf, fs_ex_size);
 999         if (rc && extents)
1000                 OBD_FREE(ex_buf, (*size) * (sizeof(struct ldlm_extent)));
1001         pop_ctxt(&saved, S2SMI(sb)->smsi_ctxt, NULL);
1002         return rc;
1003 }
1004
1005 static int fsfilt_smfs_set_snap_item(struct super_block *sb, char *name)
1006 {
1007         int rc = 0;
1008
1009         ENTRY;
1010 #if CONFIG_SNAPFS
1011 #warning "still not implement for add snap item -wangdi"
1012 #endif
1013         RETURN(rc);
1014 }
1015 static int fsfilt_smfs_do_write_cow(struct dentry *de, void *extents,
1016                                     int num_extents)
1017 {
1018         int rc = 0;
1019 #if CONFIG_SNAPFS
1020         struct write_extents *w_ext = (struct write_extents *)extents;
1021         int i = 0;
1022         ENTRY;
1023         for (i = 0; i < num_extents; i++) {
1024                size_t count = w_ext->w_count;
1025                loff_t off = w_ext->w_pos;
1026                rc = smfs_cow_write_pre(de->d_inode, de, &count, &off);
1027                if (rc)
1028                         RETURN(rc);
1029                w_ext ++;
1030         }
1031 #endif
1032         RETURN(rc);
1033 }
1034
1035 static int fsfilt_smfs_add_dir_entry(struct obd_device * obd,
1036                                      struct dentry * parent, char* name,
1037                                      int namelen, unsigned long ino,
1038                                      unsigned long generation,
1039                                      unsigned long mds,
1040                                      unsigned long fid)
1041 {
1042         struct fsfilt_operations *cache_fsfilt = I2FOPS(parent->d_inode);
1043         struct dentry *cache_dentry = NULL, *dentry = NULL;
1044         struct inode *cache_parent = I2CI(parent->d_inode);
1045         int    rc = -EIO;
1046
1047         ENTRY;
1048
1049         if (!cache_fsfilt)
1050                 RETURN(rc);
1051
1052         if (!cache_fsfilt->fs_add_dir_entry)
1053                 RETURN(-ENOSYS);
1054
1055         dentry = ll_lookup_one_len(name, parent, namelen);
1056         if (IS_ERR(dentry)) {
1057                 CERROR("can't lookup %*s in %lu/%lu: %d\n", namelen,
1058                        name, parent->d_inode->i_ino,
1059                        (unsigned long) parent->d_inode->i_generation,
1060                        (int) PTR_ERR(dentry));
1061                 RETURN(PTR_ERR(dentry));
1062         }
1063         if (dentry->d_inode != NULL || dentry->d_flags & DCACHE_CROSS_REF) {
1064                 CERROR("dentry %*s(0x%p) found\n", dentry->d_name.len,
1065                        dentry->d_name.name, dentry);
1066                 l_dput(dentry);
1067                 RETURN(-EEXIST);
1068         }
1069         /* mds_reint_rename() may use this method to add dir entry
1070          * that points onto local inode. and we don't want to find
1071          * it cross-ref by subsequent lookups */
1072         d_drop(dentry);
1073
1074         dentry->d_flags |= DCACHE_CROSS_REF;
1075         dentry->d_inum = ino;
1076         dentry->d_mdsnum = mds;
1077         dentry->d_generation = generation;
1078         dentry->d_fid = fid;
1079         l_dput(dentry);
1080
1081         cache_dentry = pre_smfs_dentry(NULL, cache_parent, parent);
1082         if (!cache_dentry) {
1083                 RETURN(-ENOMEM);
1084         }
1085
1086         pre_smfs_inode(parent->d_inode, cache_parent);
1087
1088         rc = cache_fsfilt->fs_add_dir_entry(obd, cache_dentry, name, namelen,
1089                                             ino, generation, mds, fid);
1090
1091         post_smfs_inode(parent->d_inode, cache_parent);
1092
1093         post_smfs_dentry(cache_dentry);
1094
1095         RETURN(rc);
1096
1097 }
1098
1099 static int fsfilt_smfs_del_dir_entry(struct obd_device * obd,
1100                                      struct dentry * dentry)
1101 {
1102         struct fsfilt_operations *cache_fsfilt = I2FOPS(dentry->d_parent->d_inode);
1103         struct dentry *cache_dentry = NULL, *cache_parent = NULL;
1104         struct inode * cache_dir = I2CI(dentry->d_parent->d_inode);
1105         struct inode * cache_inode = NULL;
1106         int    rc = -EIO;
1107
1108         ENTRY;
1109
1110         if (!cache_fsfilt)
1111                 RETURN(rc);
1112
1113         if (!cache_fsfilt->fs_del_dir_entry)
1114                 RETURN(-ENOSYS);
1115
1116         if (dentry->d_inode)
1117                 cache_inode = I2CI(dentry->d_inode);
1118
1119         cache_parent = pre_smfs_dentry(NULL, cache_dir, dentry->d_parent);
1120         cache_dentry = pre_smfs_dentry(cache_parent, cache_inode, dentry);
1121         if (!cache_parent || !cache_dentry) {
1122                 rc = (-ENOMEM);
1123                 goto exit;
1124         }
1125
1126         pre_smfs_inode(dentry->d_parent->d_inode, cache_dir);
1127         pre_smfs_inode(dentry->d_inode, cache_inode);
1128
1129         rc = cache_fsfilt->fs_del_dir_entry(obd, cache_dentry);
1130
1131         if (!rc)
1132                 d_drop(dentry);
1133
1134         post_smfs_inode(dentry->d_inode, cache_inode);
1135         post_smfs_inode(dentry->d_parent->d_inode, cache_dir);
1136 exit:
1137         post_smfs_dentry(cache_dentry);
1138         post_smfs_dentry(cache_parent);
1139         RETURN(rc);
1140
1141 }
1142
1143
1144 static struct fsfilt_operations fsfilt_smfs_ops = {
1145         .fs_type                = "smfs",
1146         .fs_owner               = THIS_MODULE,
1147         .fs_start               = fsfilt_smfs_start,
1148         .fs_brw_start           = fsfilt_smfs_brw_start,
1149         .fs_commit              = fsfilt_smfs_commit,
1150         .fs_commit_async        = fsfilt_smfs_commit_async,
1151         .fs_commit_wait         = fsfilt_smfs_commit_wait,
1152         .fs_setattr             = fsfilt_smfs_setattr,
1153         .fs_iocontrol           = fsfilt_smfs_iocontrol,
1154         .fs_set_md              = fsfilt_smfs_set_md,
1155         .fs_get_md              = fsfilt_smfs_get_md,
1156         .fs_readpage            = fsfilt_smfs_readpage,
1157         .fs_getpage             = fsfilt_smfs_getpage,
1158         .fs_add_journal_cb      = fsfilt_smfs_add_journal_cb,
1159         .fs_statfs              = fsfilt_smfs_statfs,
1160         .fs_sync                = fsfilt_smfs_sync,
1161         .fs_map_inode_pages     = fsfilt_smfs_map_inode_pages,
1162         .fs_prep_san_write      = fsfilt_smfs_prep_san_write,
1163         .fs_write_record        = fsfilt_smfs_write_record,
1164         .fs_read_record         = fsfilt_smfs_read_record,
1165         .fs_setup               = fsfilt_smfs_setup,
1166         .fs_send_bio            = fsfilt_smfs_send_bio,
1167         .fs_set_xattr           = fsfilt_smfs_set_xattr,
1168         .fs_get_xattr           = fsfilt_smfs_get_xattr,
1169         .fs_get_op_len          = NULL,
1170         .fs_del_dir_entry       = fsfilt_smfs_del_dir_entry,
1171         .fs_add_dir_entry       = fsfilt_smfs_add_dir_entry,
1172         .fs_insert_extents_ea   = fsfilt_smfs_insert_extents_ea,
1173         .fs_remove_extents_ea   = fsfilt_smfs_remove_extents_ea,
1174         .fs_init_extents_ea     = fsfilt_smfs_init_extents_ea,
1175         .fs_get_ino_write_extents = fsfilt_smfs_get_ino_write_extents,
1176         .fs_get_write_extents_num = NULL,
1177
1178         .fs_free_write_extents  = fsfilt_smfs_free_extents,
1179         .fs_write_extents       = fsfilt_smfs_write_extents,
1180         .fs_post_setup          = fsfilt_smfs_post_setup,
1181         .fs_post_cleanup        = fsfilt_smfs_post_cleanup,
1182         .fs_set_fs_flags        = fsfilt_smfs_set_fs_flags,
1183         .fs_clear_fs_flags      = fsfilt_smfs_clear_fs_flags,
1184         .fs_get_fs_flags        = fsfilt_smfs_get_fs_flags,
1185         .fs_set_ost_flags       = fsfilt_smfs_set_ost_flags,
1186         .fs_set_mds_flags       = fsfilt_smfs_set_mds_flags,
1187         .fs_precreate_rec       = fsfilt_smfs_precreate_rec,
1188         .fs_get_reint_log_ctxt  = NULL, /*fsfilt_smfs_get_reint_log_ctxt,*/
1189         .fs_set_snap_item       = fsfilt_smfs_set_snap_item,
1190         .fs_do_write_cow        = fsfilt_smfs_do_write_cow,
1191  };
1192
1193 struct fsfilt_operations *get_smfs_fs_ops(void)
1194 {
1195         return (&fsfilt_smfs_ops);
1196 }
1197 EXPORT_SYMBOL(get_smfs_fs_ops);
1198
1199