lustre/obdfilter/filter_io_26.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  linux/fs/obdfilter/filter_io.c
   5  *
   6  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   7  *   Author: Peter Braam <braam@clusterfs.com>
   8  *   Author: Andreas Dilger <adilger@clusterfs.com>
   9  *   Author: Phil Schwan <phil@clusterfs.com>
  10  *
  11  *   This file is part of the Lustre file system, http://www.lustre.org
  12  *   Lustre is a trademark of Cluster File Systems, Inc.
  13  *
  14  *   You may have signed or agreed to another license before downloading
  15  *   this software.  If so, you are bound by the terms and conditions
  16  *   of that agreement, and the following does not apply to you.  See the
  17  *   LICENSE file included with this distribution for more information.
  18  *
  19  *   If you did not agree to a different license, then this copy of Lustre
  20  *   is open source software; you can redistribute it and/or modify it
  21  *   under the terms of version 2 of the GNU General Public License as
  22  *   published by the Free Software Foundation.
  23  *
  24  *   In either case, Lustre is distributed in the hope that it will be
  25  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  26  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *   license text for more details.
  28  */
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/pagemap.h> // XXX kill me soon
  33 #include <linux/version.h>
  34 #include <linux/buffer_head.h>
  35
  36 #define DEBUG_SUBSYSTEM S_FILTER
  37
  38 #include <linux/obd_class.h>
  39 #include <linux/lustre_fsfilt.h>
  40 #include <linux/lustre_quota.h>
  41 #include "filter_internal.h"
  42
  43 /* 512byte block min */
  44 #define MAX_BLOCKS_PER_PAGE (PAGE_SIZE / 512)
  45 struct filter_iobuf {
  46         atomic_t          dr_numreqs;  /* number of reqs being processed */
  47         struct bio       *dr_bios;     /* list of completed bios */
  48         wait_queue_head_t dr_wait;
  49         int               dr_max_pages;
  50         int               dr_npages;
  51         int               dr_error;
  52         struct page     **dr_pages;
  53         unsigned long    *dr_blocks;
  54         spinlock_t        dr_lock;
  55         unsigned long     dr_start_time; /* jiffies */
  56         unsigned int      dr_ignore_quota:1;
  57         struct filter_obd *dr_filter;
  58 };
  59
  60 static void record_start_io(struct filter_iobuf *iobuf, int rw, int size)
  61 {
  62         struct filter_obd *filter = iobuf->dr_filter;
  63         unsigned long flags;
  64
  65         atomic_inc(&iobuf->dr_numreqs);
  66
  67         if (rw == OBD_BRW_READ) {
  68                 lprocfs_oh_tally(&filter->fo_read_rpc_hist,
  69                                  filter->fo_r_in_flight);
  70                 lprocfs_oh_tally_log2(&filter->fo_r_disk_iosize, size);
  71         } else {
  72                 lprocfs_oh_tally(&filter->fo_write_rpc_hist,
  73                                  filter->fo_w_in_flight);
  74                 lprocfs_oh_tally_log2(&filter->fo_w_disk_iosize, size);
  75         }
  76         spin_lock_irqsave(&filter->fo_stats_lock, flags);
  77         if (rw == OBD_BRW_READ)
  78                 filter->fo_r_in_flight++;
  79         else
  80                 filter->fo_w_in_flight++;
  81         spin_unlock_irqrestore(&filter->fo_stats_lock, flags);
  82         iobuf->dr_start_time = jiffies;
  83 }
  84
  85 static void record_finish_io(struct filter_iobuf *iobuf, int rw, int rc)
  86 {
  87         struct filter_obd *filter = iobuf->dr_filter;
  88         unsigned long flags, stop_time = jiffies;
  89
  90         spin_lock_irqsave(&filter->fo_stats_lock, flags);
  91         if (rw == OBD_BRW_READ)
  92                 filter->fo_r_in_flight--;
  93         else
  94                 filter->fo_w_in_flight--;
  95         spin_unlock_irqrestore(&filter->fo_stats_lock, flags);
  96
  97         if (atomic_dec_and_test(&iobuf->dr_numreqs))
  98                 wake_up(&iobuf->dr_wait);
  99
 100         if (rc != 0)
 101                 return;
 102
 103         if (rw == OBD_BRW_READ) {
 104                 lprocfs_oh_tally_log2(&filter->fo_r_io_time,
 105                                       stop_time - iobuf->dr_start_time);
 106         } else {
 107                 lprocfs_oh_tally_log2(&filter->fo_w_io_time,
 108                                       stop_time - iobuf->dr_start_time);
 109         }
 110 }
 111
 112 static int dio_complete_routine(struct bio *bio, unsigned int done, int error)
 113 {
 114         struct filter_iobuf *iobuf = bio->bi_private;
 115         unsigned long flags;
 116
 117         if (bio->bi_size) {
 118                 CWARN("gets called against non-complete bio 0x%p: %d/%d/%d\n",
 119                       bio, bio->bi_size, done, error);
 120                 return 1;
 121         }
 122
 123         if (iobuf == NULL) {
 124                 CERROR("***** bio->bi_private is NULL!  This should never "
 125                        "happen.  Normally, I would crash here, but instead I "
 126                        "will dump the bio contents to the console.  Please "
 127                        "report this to CFS, along with any interesting "
 128                        "messages leading up to this point (like SCSI errors, "
 129                        "perhaps).  Because bi_private is NULL, I can't wake up "
 130                        "the thread that initiated this I/O -- so you will "
 131                        "probably have to reboot this node.\n");
 132                 CERROR("bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d, "
 133                        "bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, "
 134                        "bi_private: %p\n", bio->bi_next, bio->bi_flags,
 135                        bio->bi_rw, bio->bi_vcnt, bio->bi_idx, bio->bi_size,
 136                        bio->bi_end_io, atomic_read(&bio->bi_cnt),
 137                        bio->bi_private);
 138                 return 0;
 139         }
 140
 141         spin_lock_irqsave(&iobuf->dr_lock, flags);
 142         bio->bi_private = iobuf->dr_bios;
 143         iobuf->dr_bios = bio;
 144         if (iobuf->dr_error == 0)
 145                 iobuf->dr_error = error;
 146         spin_unlock_irqrestore(&iobuf->dr_lock, flags);
 147
 148         record_finish_io(iobuf, test_bit(BIO_RW, &bio->bi_rw) ?
 149                          OBD_BRW_WRITE : OBD_BRW_READ, error);
 150
 151         return 0;
 152 }
 153
 154 static int can_be_merged(struct bio *bio, sector_t sector)
 155 {
 156         unsigned int size;
 157
 158         if (!bio)
 159                 return 0;
 160
 161         size = bio->bi_size >> 9;
 162         return bio->bi_sector + size == sector ? 1 : 0;
 163 }
 164
 165 struct filter_iobuf *filter_alloc_iobuf(struct filter_obd *filter,
 166                                         int rw, int num_pages)
 167 {
 168         struct filter_iobuf *iobuf;
 169
 170         LASSERTF(rw == OBD_BRW_WRITE || rw == OBD_BRW_READ, "%x\n", rw);
 171
 172         OBD_ALLOC(iobuf, sizeof(*iobuf));
 173         if (iobuf == NULL)
 174                 goto failed_0;
 175
 176         OBD_ALLOC(iobuf->dr_pages, num_pages * sizeof(*iobuf->dr_pages));
 177         if (iobuf->dr_pages == NULL)
 178                 goto failed_1;
 179
 180         OBD_ALLOC(iobuf->dr_blocks,
 181                   MAX_BLOCKS_PER_PAGE * num_pages * sizeof(*iobuf->dr_blocks));
 182         if (iobuf->dr_blocks == NULL)
 183                 goto failed_2;
 184
 185         iobuf->dr_filter = filter;
 186         iobuf->dr_bios = NULL;
 187         init_waitqueue_head(&iobuf->dr_wait);
 188         atomic_set(&iobuf->dr_numreqs, 0);
 189         spin_lock_init(&iobuf->dr_lock);
 190         iobuf->dr_max_pages = num_pages;
 191         iobuf->dr_npages = 0;
 192
 193         RETURN(iobuf);
 194
 195  failed_2:
 196         OBD_FREE(iobuf->dr_pages,
 197                  num_pages * sizeof(*iobuf->dr_pages));
 198  failed_1:
 199         OBD_FREE(iobuf, sizeof(*iobuf));
 200  failed_0:
 201         RETURN(ERR_PTR(-ENOMEM));
 202 }
 203
 204 static void filter_clear_iobuf(struct filter_iobuf *iobuf)
 205 {
 206         /* free all bios */
 207         while (iobuf->dr_bios) {
 208                 struct bio *bio = iobuf->dr_bios;
 209                 iobuf->dr_bios = bio->bi_private;
 210                 bio_put(bio);
 211         }
 212         iobuf->dr_npages = 0;
 213         atomic_set(&iobuf->dr_numreqs, 0);
 214 }
 215
 216 void filter_free_iobuf(struct filter_iobuf *iobuf)
 217 {
 218         int num_pages = iobuf->dr_max_pages;
 219
 220         filter_clear_iobuf(iobuf);
 221
 222         OBD_FREE(iobuf->dr_blocks,
 223                  MAX_BLOCKS_PER_PAGE * num_pages * sizeof(*iobuf->dr_blocks));
 224         OBD_FREE(iobuf->dr_pages,
 225                  num_pages * sizeof(*iobuf->dr_pages));
 226         OBD_FREE_PTR(iobuf);
 227 }
 228
 229 void filter_iobuf_put(struct filter_obd *filter, struct filter_iobuf *iobuf,
 230                       struct obd_trans_info *oti)
 231 {
 232         int thread_id = oti ? oti->oti_thread_id : -1;
 233
 234         if (unlikely(thread_id < 0)) {
 235                 filter_free_iobuf(iobuf);
 236                 return;
 237         }
 238
 239         LASSERTF(filter->fo_iobuf_pool[thread_id] == iobuf,
 240                  "iobuf mismatch for thread %d: pool %p iobuf %p\n",
 241                  thread_id, filter->fo_iobuf_pool[thread_id], iobuf);
 242         filter_clear_iobuf(iobuf);
 243 }
 244
 245 int filter_iobuf_add_page(struct obd_device *obd, struct filter_iobuf *iobuf,
 246                           struct inode *inode, struct page *page)
 247 {
 248         LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
 249         iobuf->dr_pages[iobuf->dr_npages++] = page;
 250
 251         return 0;
 252 }
 253
 254 int filter_do_bio(struct obd_device *obd, struct inode *inode,
 255                   struct filter_iobuf *iobuf, int rw)
 256 {
 257         int            blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 258         struct page  **pages = iobuf->dr_pages;
 259         int            npages = iobuf->dr_npages;
 260         unsigned long *blocks = iobuf->dr_blocks;
 261         int            total_blocks = npages * blocks_per_page;
 262         int            sector_bits = inode->i_sb->s_blocksize_bits - 9;
 263         unsigned int   blocksize = inode->i_sb->s_blocksize;
 264         struct bio    *bio = NULL;
 265         struct page   *page;
 266         unsigned int   page_offset;
 267         sector_t       sector;
 268         int            nblocks;
 269         int            block_idx;
 270         int            page_idx;
 271         int            i;
 272         int            rc = 0;
 273         ENTRY;
 274
 275         LASSERT(iobuf->dr_npages == npages);
 276         LASSERT(total_blocks <= OBDFILTER_CREATED_SCRATCHPAD_ENTRIES);
 277
 278         for (page_idx = 0, block_idx = 0;
 279              page_idx < npages;
 280              page_idx++, block_idx += blocks_per_page) {
 281
 282                 page = pages[page_idx];
 283                 LASSERT (block_idx + blocks_per_page <= total_blocks);
 284
 285                 for (i = 0, page_offset = 0;
 286                      i < blocks_per_page;
 287                      i += nblocks, page_offset += blocksize * nblocks) {
 288
 289                         nblocks = 1;
 290
 291                         if (blocks[block_idx + i] == 0) {  /* hole */
 292                                 LASSERT(rw == OBD_BRW_READ);
 293                                 memset(kmap(page) + page_offset, 0, blocksize);
 294                                 kunmap(page);
 295                                 continue;
 296                         }
 297
 298                         sector = blocks[block_idx + i] << sector_bits;
 299
 300                         /* Additional contiguous file blocks? */
 301                         while (i + nblocks < blocks_per_page &&
 302                                (sector + nblocks*(blocksize>>9)) ==
 303                                (blocks[block_idx + i + nblocks] << sector_bits))
 304                                 nblocks++;
 305
 306                         if (bio != NULL &&
 307                             can_be_merged(bio, sector) &&
 308                             bio_add_page(bio, page,
 309                                          blocksize * nblocks, page_offset) != 0)
 310                                 continue;       /* added this frag OK */
 311
 312                         if (bio != NULL) {
 313                                 request_queue_t *q =
 314                                         bdev_get_queue(bio->bi_bdev);
 315
 316                                 /* Dang! I have to fragment this I/O */
 317                                 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
 318                                        "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
 319                                        bio->bi_size,
 320                                        bio->bi_vcnt, bio->bi_max_vecs,
 321                                        bio->bi_size >> 9, q->max_sectors,
 322                                        bio_phys_segments(q, bio),
 323                                        q->max_phys_segments,
 324                                        bio_hw_segments(q, bio),
 325                                        q->max_hw_segments);
 326
 327                                 record_start_io(iobuf, rw, bio->bi_size);
 328                                 rc = fsfilt_send_bio(rw, obd, inode, bio);
 329                                 if (rc < 0) {
 330                                         CERROR("Can't send bio: %d\n", rc);
 331                                         record_finish_io(iobuf, rw, rc);
 332                                         goto out;
 333                                 }
 334                         }
 335
 336                         /* allocate new bio */
 337                         bio = bio_alloc(GFP_NOIO,
 338                                         (npages - page_idx) * blocks_per_page);
 339                         if (bio == NULL) {
 340                                 CERROR ("Can't allocate bio\n");
 341                                 rc = -ENOMEM;
 342                                 goto out;
 343                         }
 344
 345                         bio->bi_bdev = inode->i_sb->s_bdev;
 346                         bio->bi_sector = sector;
 347                         bio->bi_end_io = dio_complete_routine;
 348                         bio->bi_private = iobuf;
 349
 350                         rc = bio_add_page(bio, page,
 351                                           blocksize * nblocks, page_offset);
 352                         LASSERT (rc != 0);
 353                 }
 354         }
 355
 356         if (bio != NULL) {
 357                 record_start_io(iobuf, rw, bio->bi_size);
 358                 rc = fsfilt_send_bio(rw, obd, inode, bio);
 359                 if (rc >= 0) {
 360                         rc = 0;
 361                 } else {
 362                         CERROR("Can't send bio: %d\n", rc);
 363                         record_finish_io(iobuf, rw, rc);
 364                 }
 365         }
 366
 367  out:
 368         wait_event(iobuf->dr_wait, atomic_read(&iobuf->dr_numreqs) == 0);
 369
 370         if (rc == 0)
 371                 rc = iobuf->dr_error;
 372         RETURN(rc);
 373 }
 374
 375 /* These are our hacks to keep our directio/bh IO coherent with ext3's
 376  * page cache use.  Most notably ext3 reads file data into the page
 377  * cache when it is zeroing the tail of partial-block truncates and
 378  * leaves it there, sometimes generating io from it at later truncates.
 379  * This removes the partial page and its buffers from the page cache,
 380  * so it should only ever cause a wait in rare cases, as otherwise we
 381  * always do full-page IO to the OST.
 382  *
 383  * The call to truncate_complete_page() will call journal_invalidatepage()
 384  * to free the buffers and drop the page from cache.  The buffers should
 385  * not be dirty, because we already called fdatasync/fdatawait on them.
 386  */
 387 static int filter_clear_page_cache(struct inode *inode,
 388                                     struct filter_iobuf *iobuf)
 389 {
 390         struct page *page;
 391         int i, rc, rc2;
 392
 393         /* This is nearly generic_osync_inode, without the waiting on the inode
 394         rc = generic_osync_inode(inode, inode->i_mapping,
 395                                  OSYNC_DATA|OSYNC_METADATA);
 396          */
 397         rc = filemap_fdatawrite(inode->i_mapping);
 398         rc2 = sync_mapping_buffers(inode->i_mapping);
 399         if (rc == 0)
 400                 rc = rc2;
 401         rc2 = filemap_fdatawait(inode->i_mapping);
 402         if (rc == 0)
 403                 rc = rc2;
 404         if (rc != 0)
 405                 RETURN(rc);
 406
 407         /* be careful to call this after fsync_inode_data_buffers has waited
 408          * for IO to complete before we evict it from the cache */
 409         for (i = 0; i < iobuf->dr_npages; i++) {
 410                 page = find_lock_page(inode->i_mapping,
 411                                       iobuf->dr_pages[i]->index);
 412                 if (page == NULL)
 413                         continue;
 414                 if (page->mapping != NULL) {
 415                         wait_on_page_writeback(page);
 416                         ll_truncate_complete_page(page);
 417                 }
 418
 419                 unlock_page(page);
 420                 page_cache_release(page);
 421         }
 422
 423         return 0;
 424 }
 425
 426 /* Must be called with i_sem taken for writes; this will drop it */
 427 int filter_direct_io(int rw, struct dentry *dchild, struct filter_iobuf *iobuf,
 428                      struct obd_export *exp, struct iattr *attr,
 429                      struct obd_trans_info *oti, void **wait_handle)
 430 {
 431         struct obd_device *obd = exp->exp_obd;
 432         struct inode *inode = dchild->d_inode;
 433         int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
 434         int rc, rc2, create;
 435         struct semaphore *sem;
 436         ENTRY;
 437
 438         LASSERTF(iobuf->dr_npages <= iobuf->dr_max_pages, "%d,%d\n",
 439                  iobuf->dr_npages, iobuf->dr_max_pages);
 440         LASSERT(iobuf->dr_npages <= OBDFILTER_CREATED_SCRATCHPAD_ENTRIES);
 441
 442         if (rw == OBD_BRW_READ) {
 443                 if (iobuf->dr_npages == 0)
 444                         RETURN(0);
 445                 create = 0;
 446                 sem = NULL;
 447         } else {
 448                 LASSERTF(rw == OBD_BRW_WRITE, "%x\n", rw);
 449                 LASSERT(iobuf->dr_npages > 0);
 450                 create = 1;
 451                 sem = &obd->u.filter.fo_alloc_lock;
 452
 453                 lquota_enforce(quota_interface, obd, iobuf->dr_ignore_quota);
 454         }
 455 remap:
 456         rc = fsfilt_map_inode_pages(obd, inode, iobuf->dr_pages,
 457                                     iobuf->dr_npages, iobuf->dr_blocks,
 458                                     obdfilter_created_scratchpad, create, sem);
 459
 460         if (rc == -EDQUOT) {
 461                 LASSERT(rw == OBD_BRW_WRITE &&
 462                         !cap_raised(current->cap_effective, CAP_SYS_RESOURCE));
 463
 464                 /* Unfortunately, if quota master is too busy to handle the
 465                  * pre-dqacq in time or this user has exceeded quota limit, we
 466                  * have to wait for the completion of in flight dqacq/dqrel,
 467                  * then try again */
 468                 if (lquota_acquire(quota_interface, obd, inode->i_uid,
 469                                    inode->i_gid))
 470                         goto remap;
 471         }
 472
 473         if (rw == OBD_BRW_WRITE) {
 474                 if (rc == 0) {
 475                         filter_tally_write(&obd->u.filter,
 476                                            iobuf->dr_pages,
 477                                            iobuf->dr_npages,
 478                                            iobuf->dr_blocks,
 479                                            blocks_per_page);
 480                         if (attr->ia_size > inode->i_size)
 481                                 attr->ia_valid |= ATTR_SIZE;
 482                         rc = fsfilt_setattr(obd, dchild,
 483                                             oti->oti_handle, attr, 0);
 484                 }
 485
 486                 up(&inode->i_sem);
 487
 488                 rc2 = filter_finish_transno(exp, oti, 0);
 489                 if (rc2 != 0) {
 490                         CERROR("can't close transaction: %d\n", rc2);
 491                         if (rc == 0)
 492                                 rc = rc2;
 493                 }
 494
 495                 rc2 =fsfilt_commit_async(obd,inode,oti->oti_handle,wait_handle);
 496                 if (rc == 0)
 497                         rc = rc2;
 498                 if (rc != 0)
 499                         RETURN(rc);
 500         }
 501
 502         rc = filter_clear_page_cache(inode, iobuf);
 503         if (rc != 0)
 504                 RETURN(rc);
 505
 506         RETURN(filter_do_bio(obd, inode, iobuf, rw));
 507 }
 508
 509 /* See if there are unallocated parts in given file region */
 510 static int filter_range_is_mapped(struct inode *inode, obd_size offset, int len)
 511 {
 512         sector_t (*fs_bmap)(struct address_space *, sector_t) =
 513                 inode->i_mapping->a_ops->bmap;
 514         int j;
 515
 516         /* We can't know if we are overwriting or not */
 517         if (fs_bmap == NULL)
 518                 return 0;
 519
 520         offset >>= inode->i_blkbits;
 521         len >>= inode->i_blkbits;
 522
 523         for (j = 0; j <= len; j++)
 524                 if (fs_bmap(inode->i_mapping, offset + j) == 0)
 525                         return 0;
 526
 527         return 1;
 528 }
 529
 530 int filter_commitrw_write(struct obd_export *exp, struct obdo *oa,
 531                           int objcount, struct obd_ioobj *obj, int niocount,
 532                           struct niobuf_local *res, struct obd_trans_info *oti,
 533                           int rc)
 534 {
 535         struct niobuf_local *lnb;
 536         struct filter_iobuf *iobuf = NULL;
 537         struct lvfs_run_ctxt saved;
 538         struct fsfilt_objinfo fso;
 539         struct iattr iattr = { 0 };
 540         struct inode *inode = NULL;
 541         unsigned long now = jiffies;
 542         int i, err, cleanup_phase = 0;
 543         struct obd_device *obd = exp->exp_obd;
 544         void *wait_handle;
 545         int   total_size = 0;
 546         unsigned int qcids[MAXQUOTAS] = {0, 0};
 547         ENTRY;
 548
 549         LASSERT(oti != NULL);
 550         LASSERT(objcount == 1);
 551         LASSERT(current->journal_info == NULL);
 552
 553         if (rc != 0)
 554                 GOTO(cleanup, rc);
 555
 556         iobuf = filter_iobuf_get(&obd->u.filter, oti);
 557         cleanup_phase = 1;
 558
 559         fso.fso_dentry = res->dentry;
 560         fso.fso_bufcnt = obj->ioo_bufcnt;
 561         inode = res->dentry->d_inode;
 562
 563         iobuf->dr_ignore_quota = 0;
 564         for (i = 0, lnb = res; i < obj->ioo_bufcnt; i++, lnb++) {
 565                 loff_t this_size;
 566
 567                 /* If overwriting an existing block, we don't need a grant */
 568                 if (!(lnb->flags & OBD_BRW_GRANTED) && lnb->rc == -ENOSPC &&
 569                     filter_range_is_mapped(inode, lnb->offset, lnb->len))
 570                         lnb->rc = 0;
 571
 572                 if (lnb->rc) { /* ENOSPC, network RPC error, etc. */
 573                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i, lnb->rc);
 574                         continue;
 575                 }
 576
 577                 err = filter_iobuf_add_page(obd, iobuf, inode, lnb->page);
 578                 LASSERT (err == 0);
 579
 580                 total_size += lnb->len;
 581
 582                 /* we expect these pages to be in offset order, but we'll
 583                  * be forgiving */
 584                 this_size = lnb->offset + lnb->len;
 585                 if (this_size > iattr.ia_size)
 586                         iattr.ia_size = this_size;
 587
 588                 /* if one page is a write-back page from client cache, or it's
 589                  * written by root, then mark the whole io request as ignore
 590                  * quota request */
 591                 if (lnb->flags & (OBD_BRW_FROM_GRANT | OBD_BRW_NOQUOTA))
 592                         iobuf->dr_ignore_quota = 1;
 593         }
 594
 595         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 596         cleanup_phase = 2;
 597
 598         down(&inode->i_sem);
 599         fsfilt_check_slow(now, obd_timeout, "i_sem");
 600         oti->oti_handle = fsfilt_brw_start(obd, objcount, &fso, niocount, res,
 601                                            oti);
 602         if (IS_ERR(oti->oti_handle)) {
 603                 up(&inode->i_sem);
 604                 rc = PTR_ERR(oti->oti_handle);
 605                 CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
 606                        "error starting transaction: rc = %d\n", rc);
 607                 oti->oti_handle = NULL;
 608                 GOTO(cleanup, rc);
 609         }
 610         /* have to call fsfilt_commit() from this point on */
 611
 612         fsfilt_check_slow(now, obd_timeout, "brw_start");
 613
 614         i = OBD_MD_FLATIME | OBD_MD_FLMTIME | OBD_MD_FLCTIME;
 615
 616         /* If the inode still has SUID+SGID bits set (see filter_precreate())
 617          * then we will accept the UID+GID if sent by the client for
 618          * initializing the ownership of this inode.  We only allow this to
 619          * happen once (so clear these bits) and later only allow setattr. */
 620         if (inode->i_mode & S_ISUID)
 621                 i |= OBD_MD_FLUID;
 622         if (inode->i_mode & S_ISGID)
 623                 i |= OBD_MD_FLGID;
 624
 625         iattr_from_obdo(&iattr, oa, i);
 626         if (iattr.ia_valid & (ATTR_UID | ATTR_GID)) {
 627                 CDEBUG(D_INODE, "update UID/GID to %lu/%lu\n",
 628                        (unsigned long)oa->o_uid, (unsigned long)oa->o_gid);
 629
 630                 cap_raise(current->cap_effective, CAP_SYS_RESOURCE);
 631
 632                 iattr.ia_valid |= ATTR_MODE;
 633                 iattr.ia_mode = inode->i_mode;
 634                 if (iattr.ia_valid & ATTR_UID)
 635                         iattr.ia_mode &= ~S_ISUID;
 636                 if (iattr.ia_valid & ATTR_GID)
 637                         iattr.ia_mode &= ~S_ISGID;
 638
 639                 rc = filter_update_fidea(exp, inode, oti->oti_handle, oa);
 640         }
 641
 642         /* filter_direct_io drops i_sem */
 643         rc = filter_direct_io(OBD_BRW_WRITE, res->dentry, iobuf, exp, &iattr,
 644                               oti, &wait_handle);
 645         if (rc == 0)
 646                 obdo_from_inode(oa, inode,
 647                                 FILTER_VALID_FLAGS |OBD_MD_FLUID |OBD_MD_FLGID);
 648         else
 649                 obdo_from_inode(oa, inode, OBD_MD_FLUID | OBD_MD_FLGID);
 650
 651         lquota_getflag(quota_interface, obd, oa);
 652
 653         fsfilt_check_slow(now, obd_timeout, "direct_io");
 654
 655         err = fsfilt_commit_wait(obd, inode, wait_handle);
 656         if (err)
 657                 rc = err;
 658
 659         if (obd_sync_filter && !err)
 660                 LASSERTF(oti->oti_transno <= obd->obd_last_committed,
 661                          "oti_transno "LPU64" last_committed "LPU64"\n",
 662                          oti->oti_transno, obd->obd_last_committed);
 663
 664         fsfilt_check_slow(now, obd_timeout, "commitrw commit");
 665
 666 cleanup:
 667         filter_grant_commit(exp, niocount, res);
 668
 669         switch (cleanup_phase) {
 670         case 2:
 671                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 672                 LASSERT(current->journal_info == NULL);
 673         case 1:
 674                 filter_iobuf_put(&obd->u.filter, iobuf, oti);
 675         case 0:
 676                 /*
 677                  * lnb->page automatically returns back into per-thread page
 678                  * pool (bug 5137)
 679                  */
 680                 f_dput(res->dentry);
 681         }
 682
 683         /* trigger quota pre-acquire */
 684         qcids[USRQUOTA] = oa->o_uid;
 685         qcids[GRPQUOTA] = oa->o_gid;
 686         err = lquota_adjust(quota_interface, obd, qcids, NULL, rc,
 687                             FSFILT_OP_CREATE);
 688         CDEBUG(err ? D_ERROR : D_QUOTA,
 689                "error filter adjust qunit! (rc:%d)\n", err);
 690
 691         RETURN(rc);
 692 }