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[fs/lustre-release.git] / lustre / osd-ldiskfs / osd_io.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19  *
20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21  * CA 95054 USA or visit www.sun.com if you need additional information or
22  * have any questions.
23  *
24  * GPL HEADER END
25  */
26 /*
27  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
28  * Use is subject to license terms.
29  *
30  * Copyright (c) 2012, 2015, Intel Corporation.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  *
36  * lustre/osd/osd_io.c
37  *
38  * body operations
39  *
40  * Author: Nikita Danilov <nikita@clusterfs.com>
41  * Author: Alex Zhuravlev <bzzz@whamcloud.com>
42  *
43  */
44
45 /* LUSTRE_VERSION_CODE */
46 #include <lustre_ver.h>
47 /* prerequisite for linux/xattr.h */
48 #include <linux/types.h>
49 /* prerequisite for linux/xattr.h */
50 #include <linux/fs.h>
51
52 /*
53  * struct OBD_{ALLOC,FREE}*()
54  * OBD_FAIL_CHECK
55  */
56 #include <obd_support.h>
57
58 #include "osd_internal.h"
59
60 /* ext_depth() */
61 #include <ldiskfs/ldiskfs_extents.h>
62
63 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
64                             int rw, int line, int pages)
65 {
66         int blocks, i;
67
68         LASSERTF(iobuf->dr_elapsed_valid == 0,
69                  "iobuf %p, reqs %d, rw %d, line %d\n", iobuf,
70                  atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw,
71                  iobuf->dr_init_at);
72         LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
73
74         init_waitqueue_head(&iobuf->dr_wait);
75         atomic_set(&iobuf->dr_numreqs, 0);
76         iobuf->dr_npages = 0;
77         iobuf->dr_error = 0;
78         iobuf->dr_dev = d;
79         iobuf->dr_frags = 0;
80         iobuf->dr_elapsed = 0;
81         /* must be counted before, so assert */
82         iobuf->dr_rw = rw;
83         iobuf->dr_init_at = line;
84
85         blocks = pages * (PAGE_CACHE_SIZE >> osd_sb(d)->s_blocksize_bits);
86         if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) {
87                 LASSERT(iobuf->dr_pg_buf.lb_len >=
88                         pages * sizeof(iobuf->dr_pages[0]));
89                 return 0;
90         }
91
92         /* start with 1MB for 4K blocks */
93         i = 256;
94         while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
95                 i <<= 1;
96
97         CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
98                (unsigned)(pages * sizeof(iobuf->dr_pages[0])), i, pages);
99         pages = i;
100         blocks = pages * (PAGE_CACHE_SIZE >> osd_sb(d)->s_blocksize_bits);
101         iobuf->dr_max_pages = 0;
102         CDEBUG(D_OTHER, "realloc %u for %u blocks\n",
103                (unsigned)(blocks * sizeof(iobuf->dr_blocks[0])), blocks);
104
105         lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0]));
106         iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf;
107         if (unlikely(iobuf->dr_blocks == NULL))
108                 return -ENOMEM;
109
110         lu_buf_realloc(&iobuf->dr_pg_buf, pages * sizeof(iobuf->dr_pages[0]));
111         iobuf->dr_pages = iobuf->dr_pg_buf.lb_buf;
112         if (unlikely(iobuf->dr_pages == NULL))
113                 return -ENOMEM;
114
115         iobuf->dr_max_pages = pages;
116
117         return 0;
118 }
119 #define osd_init_iobuf(dev, iobuf, rw, pages) \
120         __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages)
121
122 static void osd_iobuf_add_page(struct osd_iobuf *iobuf, struct page *page)
123 {
124         LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
125         iobuf->dr_pages[iobuf->dr_npages++] = page;
126 }
127
128 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
129 {
130         int rw = iobuf->dr_rw;
131
132         if (iobuf->dr_elapsed_valid) {
133                 iobuf->dr_elapsed_valid = 0;
134                 LASSERT(iobuf->dr_dev == d);
135                 LASSERT(iobuf->dr_frags > 0);
136                 lprocfs_oh_tally(&d->od_brw_stats.
137                                  hist[BRW_R_DIO_FRAGS+rw],
138                                  iobuf->dr_frags);
139                 lprocfs_oh_tally_log2(&d->od_brw_stats.hist[BRW_R_IO_TIME+rw],
140                                       iobuf->dr_elapsed);
141         }
142 }
143
144 #ifndef REQ_WRITE /* pre-2.6.35 */
145 #define __REQ_WRITE BIO_RW
146 #endif
147
148 static void dio_complete_routine(struct bio *bio, int error)
149 {
150         struct osd_iobuf *iobuf = bio->bi_private;
151 #ifdef HAVE_BVEC_ITER
152         struct bvec_iter iter;
153         struct bio_vec bvl;
154 #else
155         int iter;
156         struct bio_vec *bvl;
157 #endif
158
159         /* CAVEAT EMPTOR: possibly in IRQ context
160          * DO NOT record procfs stats here!!! */
161
162         if (unlikely(iobuf == NULL)) {
163                 CERROR("***** bio->bi_private is NULL!  This should never "
164                        "happen.  Normally, I would crash here, but instead I "
165                        "will dump the bio contents to the console.  Please "
166                        "report this to <https://jira.hpdd.intel.com/> , along "
167                        "with any interesting messages leading up to this point "
168                        "(like SCSI errors, perhaps).  Because bi_private is "
169                        "NULL, I can't wake up the thread that initiated this "
170                        "IO - you will probably have to reboot this node.\n");
171                 CERROR("bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d, "
172                        "bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, "
173                        "bi_private: %p\n", bio->bi_next, bio->bi_flags,
174                         bio->bi_rw, bio->bi_vcnt, bio_idx(bio),
175                         bio_sectors(bio) << 9, bio->bi_end_io,
176                         atomic_read(&bio->bi_cnt), bio->bi_private);
177                 return;
178         }
179
180         /* the check is outside of the cycle for performance reason -bzzz */
181         if (!test_bit(__REQ_WRITE, &bio->bi_rw)) {
182                 bio_for_each_segment(bvl, bio, iter) {
183                         if (likely(error == 0))
184                                 SetPageUptodate(bvl_to_page(bvl));
185                         LASSERT(PageLocked(bvl_to_page(bvl)));
186                 }
187                 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
188         } else {
189                 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
190         }
191
192         /* any real error is good enough -bzzz */
193         if (error != 0 && iobuf->dr_error == 0)
194                 iobuf->dr_error = error;
195
196         /*
197          * set dr_elapsed before dr_numreqs turns to 0, otherwise
198          * it's possible that service thread will see dr_numreqs
199          * is zero, but dr_elapsed is not set yet, leading to lost
200          * data in this processing and an assertion in a subsequent
201          * call to OSD.
202          */
203         if (atomic_read(&iobuf->dr_numreqs) == 1) {
204                 iobuf->dr_elapsed = jiffies - iobuf->dr_start_time;
205                 iobuf->dr_elapsed_valid = 1;
206         }
207         if (atomic_dec_and_test(&iobuf->dr_numreqs))
208                 wake_up(&iobuf->dr_wait);
209
210         /* Completed bios used to be chained off iobuf->dr_bios and freed in
211          * filter_clear_dreq().  It was then possible to exhaust the biovec-256
212          * mempool when serious on-disk fragmentation was encountered,
213          * deadlocking the OST.  The bios are now released as soon as complete
214          * so the pool cannot be exhausted while IOs are competing. bug 10076 */
215         bio_put(bio);
216 }
217
218 static void record_start_io(struct osd_iobuf *iobuf, int size)
219 {
220         struct osd_device    *osd = iobuf->dr_dev;
221         struct obd_histogram *h = osd->od_brw_stats.hist;
222
223         iobuf->dr_frags++;
224         atomic_inc(&iobuf->dr_numreqs);
225
226         if (iobuf->dr_rw == 0) {
227                 atomic_inc(&osd->od_r_in_flight);
228                 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
229                                  atomic_read(&osd->od_r_in_flight));
230                 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
231         } else if (iobuf->dr_rw == 1) {
232                 atomic_inc(&osd->od_w_in_flight);
233                 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
234                                  atomic_read(&osd->od_w_in_flight));
235                 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
236         } else {
237                 LBUG();
238         }
239 }
240
241 static void osd_submit_bio(int rw, struct bio *bio)
242 {
243         LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
244         if (rw == 0)
245                 submit_bio(READ, bio);
246         else
247                 submit_bio(WRITE, bio);
248 }
249
250 static int can_be_merged(struct bio *bio, sector_t sector)
251 {
252         if (bio == NULL)
253                 return 0;
254
255         return bio_end_sector(bio) == sector ? 1 : 0;
256 }
257
258 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
259                       struct osd_iobuf *iobuf)
260 {
261         int            blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
262         struct page  **pages = iobuf->dr_pages;
263         int            npages = iobuf->dr_npages;
264         sector_t      *blocks = iobuf->dr_blocks;
265         int            total_blocks = npages * blocks_per_page;
266         int            sector_bits = inode->i_sb->s_blocksize_bits - 9;
267         unsigned int   blocksize = inode->i_sb->s_blocksize;
268         struct bio    *bio = NULL;
269         struct page   *page;
270         unsigned int   page_offset;
271         sector_t       sector;
272         int            nblocks;
273         int            block_idx;
274         int            page_idx;
275         int            i;
276         int            rc = 0;
277         ENTRY;
278
279         LASSERT(iobuf->dr_npages == npages);
280
281         osd_brw_stats_update(osd, iobuf);
282         iobuf->dr_start_time = cfs_time_current();
283
284         for (page_idx = 0, block_idx = 0;
285              page_idx < npages;
286              page_idx++, block_idx += blocks_per_page) {
287
288                 page = pages[page_idx];
289                 LASSERT(block_idx + blocks_per_page <= total_blocks);
290
291                 for (i = 0, page_offset = 0;
292                      i < blocks_per_page;
293                      i += nblocks, page_offset += blocksize * nblocks) {
294
295                         nblocks = 1;
296
297                         if (blocks[block_idx + i] == 0) {  /* hole */
298                                 LASSERTF(iobuf->dr_rw == 0,
299                                          "page_idx %u, block_idx %u, i %u\n",
300                                          page_idx, block_idx, i);
301                                 memset(kmap(page) + page_offset, 0, blocksize);
302                                 kunmap(page);
303                                 continue;
304                         }
305
306                         sector = (sector_t)blocks[block_idx + i] << sector_bits;
307
308                         /* Additional contiguous file blocks? */
309                         while (i + nblocks < blocks_per_page &&
310                                (sector + (nblocks << sector_bits)) ==
311                                ((sector_t)blocks[block_idx + i + nblocks] <<
312                                 sector_bits))
313                                 nblocks++;
314
315                         if (bio != NULL &&
316                             can_be_merged(bio, sector) &&
317                             bio_add_page(bio, page,
318                                          blocksize * nblocks, page_offset) != 0)
319                                 continue;       /* added this frag OK */
320
321                         if (bio != NULL) {
322                                 struct request_queue *q =
323                                         bdev_get_queue(bio->bi_bdev);
324                                 unsigned int bi_size = bio_sectors(bio) << 9;
325
326                                 /* Dang! I have to fragment this I/O */
327                                 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
328                                        "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
329                                        bi_size, bio->bi_vcnt, bio->bi_max_vecs,
330                                        bio_sectors(bio),
331                                        queue_max_sectors(q),
332                                        bio_phys_segments(q, bio),
333                                        queue_max_phys_segments(q),
334                                        0, queue_max_hw_segments(q));
335                                 record_start_io(iobuf, bi_size);
336                                 osd_submit_bio(iobuf->dr_rw, bio);
337                         }
338
339                         /* allocate new bio */
340                         bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
341                                                       (npages - page_idx) *
342                                                       blocks_per_page));
343                         if (bio == NULL) {
344                                 CERROR("Can't allocate bio %u*%u = %u pages\n",
345                                        (npages - page_idx), blocks_per_page,
346                                        (npages - page_idx) * blocks_per_page);
347                                 rc = -ENOMEM;
348                                 goto out;
349                         }
350
351                         bio->bi_bdev = inode->i_sb->s_bdev;
352                         bio_set_sector(bio, sector);
353                         bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
354                         bio->bi_end_io = dio_complete_routine;
355                         bio->bi_private = iobuf;
356
357                         rc = bio_add_page(bio, page,
358                                           blocksize * nblocks, page_offset);
359                         LASSERT(rc != 0);
360                 }
361         }
362
363         if (bio != NULL) {
364                 record_start_io(iobuf, bio_sectors(bio) << 9);
365                 osd_submit_bio(iobuf->dr_rw, bio);
366                 rc = 0;
367         }
368
369 out:
370         /* in order to achieve better IO throughput, we don't wait for writes
371          * completion here. instead we proceed with transaction commit in
372          * parallel and wait for IO completion once transaction is stopped
373          * see osd_trans_stop() for more details -bzzz */
374         if (iobuf->dr_rw == 0) {
375                 wait_event(iobuf->dr_wait,
376                            atomic_read(&iobuf->dr_numreqs) == 0);
377                 osd_fini_iobuf(osd, iobuf);
378         }
379
380         if (rc == 0)
381                 rc = iobuf->dr_error;
382         RETURN(rc);
383 }
384
385 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
386                                    struct niobuf_local *lnb)
387 {
388         ENTRY;
389
390         *nrpages = 0;
391
392         while (len > 0) {
393                 int poff = offset & (PAGE_CACHE_SIZE - 1);
394                 int plen = PAGE_CACHE_SIZE - poff;
395
396                 if (plen > len)
397                         plen = len;
398                 lnb->lnb_file_offset = offset;
399                 lnb->lnb_page_offset = poff;
400                 lnb->lnb_len = plen;
401                 /* lnb->lnb_flags = rnb->rnb_flags; */
402                 lnb->lnb_flags = 0;
403                 lnb->lnb_page = NULL;
404                 lnb->lnb_rc = 0;
405
406                 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
407                          (long long) len);
408                 offset += plen;
409                 len -= plen;
410                 lnb++;
411                 (*nrpages)++;
412         }
413
414         RETURN(0);
415 }
416
417 static struct page *osd_get_page(struct dt_object *dt, loff_t offset, int rw)
418 {
419         struct inode      *inode = osd_dt_obj(dt)->oo_inode;
420         struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
421         struct page       *page;
422
423         LASSERT(inode);
424
425         page = find_or_create_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
426                                    GFP_NOFS | __GFP_HIGHMEM);
427         if (unlikely(page == NULL))
428                 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
429
430         return page;
431 }
432
433 /*
434  * there are following "locks":
435  * journal_start
436  * i_mutex
437  * page lock
438  *
439  * osd write path:
440  *  - lock page(s)
441  *  - journal_start
442  *  - truncate_sem
443  *
444  * ext4 vmtruncate:
445  *  - lock pages, unlock
446  *  - journal_start
447  *  - lock partial page
448  *  - i_data_sem
449  *
450  */
451
452 /**
453  * Unlock and release pages loaded by osd_bufs_get()
454  *
455  * Unlock \a npages pages from \a lnb and drop the refcount on them.
456  *
457  * \param env           thread execution environment
458  * \param dt            dt object undergoing IO (OSD object + methods)
459  * \param lnb           array of pages undergoing IO
460  * \param npages        number of pages in \a lnb
461  *
462  * \retval 0            always
463  */
464 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
465                         struct niobuf_local *lnb, int npages)
466 {
467         int i;
468
469         for (i = 0; i < npages; i++) {
470                 if (lnb[i].lnb_page == NULL)
471                         continue;
472                 LASSERT(PageLocked(lnb[i].lnb_page));
473                 unlock_page(lnb[i].lnb_page);
474                 page_cache_release(lnb[i].lnb_page);
475                 lu_object_put(env, &dt->do_lu);
476                 lnb[i].lnb_page = NULL;
477         }
478
479         RETURN(0);
480 }
481
482 /**
483  * Load and lock pages undergoing IO
484  *
485  * Pages as described in the \a lnb array are fetched (from disk or cache)
486  * and locked for IO by the caller.
487  *
488  * DLM locking protects us from write and truncate competing for same region,
489  * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
490  * It's possible the writeout on a such a page is in progress when we access
491  * it. It's also possible that during this writeout we put new (partial) data
492  * into the page, but won't be able to proceed in filter_commitrw_write().
493  * Therefore, just wait for writeout completion as it should be rare enough.
494  *
495  * \param env           thread execution environment
496  * \param dt            dt object undergoing IO (OSD object + methods)
497  * \param pos           byte offset of IO start
498  * \param len           number of bytes of IO
499  * \param lnb           array of extents undergoing IO
500  * \param rw            read or write operation?
501  * \param capa          capabilities
502  *
503  * \retval pages        (zero or more) loaded successfully
504  * \retval -ENOMEM      on memory/page allocation error
505  */
506 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
507                         loff_t pos, ssize_t len, struct niobuf_local *lnb,
508                         int rw)
509 {
510         struct osd_object   *obj    = osd_dt_obj(dt);
511         int npages, i, rc = 0;
512
513         LASSERT(obj->oo_inode);
514
515         osd_map_remote_to_local(pos, len, &npages, lnb);
516
517         for (i = 0; i < npages; i++, lnb++) {
518                 lnb->lnb_page = osd_get_page(dt, lnb->lnb_file_offset, rw);
519                 if (lnb->lnb_page == NULL)
520                         GOTO(cleanup, rc = -ENOMEM);
521
522                 wait_on_page_writeback(lnb->lnb_page);
523                 BUG_ON(PageWriteback(lnb->lnb_page));
524
525                 lu_object_get(&dt->do_lu);
526         }
527
528         RETURN(i);
529
530 cleanup:
531         if (i > 0)
532                 osd_bufs_put(env, dt, lnb - i, i);
533         return rc;
534 }
535
536 #ifndef HAVE_LDISKFS_MAP_BLOCKS
537
538 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
539 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
540 #endif
541
542 struct bpointers {
543         sector_t *blocks;
544         unsigned long start;
545         int num;
546         int init_num;
547         int create;
548 };
549
550 static long ldiskfs_ext_find_goal(struct inode *inode,
551                                   struct ldiskfs_ext_path *path,
552                                   unsigned long block, int *aflags)
553 {
554         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
555         unsigned long bg_start;
556         unsigned long colour;
557         int depth;
558
559         if (path) {
560                 struct ldiskfs_extent *ex;
561                 depth = path->p_depth;
562
563                 /* try to predict block placement */
564                 if ((ex = path[depth].p_ext))
565                         return ldiskfs_ext_pblock(ex) +
566                                 (block - le32_to_cpu(ex->ee_block));
567
568                 /* it looks index is empty
569                  * try to find starting from index itself */
570                 if (path[depth].p_bh)
571                         return path[depth].p_bh->b_blocknr;
572         }
573
574         /* OK. use inode's group */
575         bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
576                 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
577         colour = (current->pid % 16) *
578                 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
579         return bg_start + colour + block;
580 }
581
582 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
583                                 struct ldiskfs_ext_path *path,
584                                 unsigned long block, unsigned long *count,
585                                 int *err)
586 {
587         struct ldiskfs_allocation_request ar;
588         unsigned long pblock;
589         int aflags;
590
591         /* find neighbour allocated blocks */
592         ar.lleft = block;
593         *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
594         if (*err)
595                 return 0;
596         ar.lright = block;
597         *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
598         if (*err)
599                 return 0;
600
601         /* allocate new block */
602         ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
603         ar.inode = inode;
604         ar.logical = block;
605         ar.len = *count;
606         ar.flags = LDISKFS_MB_HINT_DATA;
607         pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
608         *count = ar.len;
609         return pblock;
610 }
611
612 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
613                                      struct ldiskfs_ext_path *path,
614                                      struct ldiskfs_ext_cache *cex,
615 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
616                                      struct ldiskfs_extent *ex,
617 #endif
618                                      void *cbdata)
619 {
620         struct bpointers *bp = cbdata;
621         struct ldiskfs_extent nex;
622         unsigned long pblock = 0;
623         unsigned long tgen;
624         int err, i;
625         unsigned long count;
626         handle_t *handle;
627
628 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
629         if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
630 #else
631         if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
632 #endif
633                 err = EXT_CONTINUE;
634                 goto map;
635         }
636
637         if (bp->create == 0) {
638                 i = 0;
639                 if (cex->ec_block < bp->start)
640                         i = bp->start - cex->ec_block;
641                 if (i >= cex->ec_len)
642                         CERROR("nothing to do?! i = %d, e_num = %u\n",
643                                         i, cex->ec_len);
644                 for (; i < cex->ec_len && bp->num; i++) {
645                         *(bp->blocks) = 0;
646                         bp->blocks++;
647                         bp->num--;
648                         bp->start++;
649                 }
650
651                 return EXT_CONTINUE;
652         }
653
654         tgen = LDISKFS_I(inode)->i_ext_generation;
655         count = ldiskfs_ext_calc_credits_for_insert(inode, path);
656
657         handle = osd_journal_start(inode, LDISKFS_HT_MISC,
658                                    count + LDISKFS_ALLOC_NEEDED + 1);
659         if (IS_ERR(handle)) {
660                 return PTR_ERR(handle);
661         }
662
663         if (tgen != LDISKFS_I(inode)->i_ext_generation) {
664                 /* the tree has changed. so path can be invalid at moment */
665                 ldiskfs_journal_stop(handle);
666                 return EXT_REPEAT;
667         }
668
669         /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
670          * protected by i_data_sem as whole. so we patch it to store
671          * generation to path and now verify the tree hasn't changed */
672         down_write((&LDISKFS_I(inode)->i_data_sem));
673
674         /* validate extent, make sure the extent tree does not changed */
675         if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
676                 /* cex is invalid, try again */
677                 up_write(&LDISKFS_I(inode)->i_data_sem);
678                 ldiskfs_journal_stop(handle);
679                 return EXT_REPEAT;
680         }
681
682         count = cex->ec_len;
683         pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
684         if (!pblock)
685                 goto out;
686         BUG_ON(count > cex->ec_len);
687
688         /* insert new extent */
689         nex.ee_block = cpu_to_le32(cex->ec_block);
690         ldiskfs_ext_store_pblock(&nex, pblock);
691         nex.ee_len = cpu_to_le16(count);
692         err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
693         if (err) {
694                 /* free data blocks we just allocated */
695                 /* not a good idea to call discard here directly,
696                  * but otherwise we'd need to call it every free() */
697                 ldiskfs_discard_preallocations(inode);
698 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
699                 ldiskfs_free_blocks(handle, inode, NULL,
700                                     ldiskfs_ext_pblock(&nex),
701                                     le16_to_cpu(nex.ee_len), 0);
702 #else
703                 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
704                                     le16_to_cpu(nex.ee_len), 0);
705 #endif
706                 goto out;
707         }
708
709         /*
710          * Putting len of the actual extent we just inserted,
711          * we are asking ldiskfs_ext_walk_space() to continue
712          * scaning after that block
713          */
714         cex->ec_len = le16_to_cpu(nex.ee_len);
715         cex->ec_start = ldiskfs_ext_pblock(&nex);
716         BUG_ON(le16_to_cpu(nex.ee_len) == 0);
717         BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
718
719 out:
720         up_write((&LDISKFS_I(inode)->i_data_sem));
721         ldiskfs_journal_stop(handle);
722 map:
723         if (err >= 0) {
724                 /* map blocks */
725                 if (bp->num == 0) {
726                         CERROR("hmm. why do we find this extent?\n");
727                         CERROR("initial space: %lu:%u\n",
728                                 bp->start, bp->init_num);
729 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
730                         CERROR("current extent: %u/%u/%llu %d\n",
731                                 cex->ec_block, cex->ec_len,
732                                 (unsigned long long)cex->ec_start,
733                                 cex->ec_type);
734 #else
735                         CERROR("current extent: %u/%u/%llu\n",
736                                 cex->ec_block, cex->ec_len,
737                                 (unsigned long long)cex->ec_start);
738 #endif
739                 }
740                 i = 0;
741                 if (cex->ec_block < bp->start)
742                         i = bp->start - cex->ec_block;
743                 if (i >= cex->ec_len)
744                         CERROR("nothing to do?! i = %d, e_num = %u\n",
745                                         i, cex->ec_len);
746                 for (; i < cex->ec_len && bp->num; i++) {
747                         *(bp->blocks) = cex->ec_start + i;
748                         if (pblock != 0) {
749                                 /* unmap any possible underlying metadata from
750                                  * the block device mapping.  bug 6998. */
751                                 unmap_underlying_metadata(inode->i_sb->s_bdev,
752                                                           *(bp->blocks));
753                         }
754                         bp->blocks++;
755                         bp->num--;
756                         bp->start++;
757                 }
758         }
759         return err;
760 }
761
762 static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
763                                    int clen, sector_t *blocks, int create)
764 {
765         int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
766         struct bpointers bp;
767         int err;
768
769         if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
770                 return -EFBIG;
771
772         bp.blocks = blocks;
773         bp.start = index * blocks_per_page;
774         bp.init_num = bp.num = clen * blocks_per_page;
775         bp.create = create;
776
777         CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
778                bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
779
780         err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
781                                      ldiskfs_ext_new_extent_cb, &bp);
782         ldiskfs_ext_invalidate_cache(inode);
783
784         return err;
785 }
786
787 static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
788                                           struct page **page, int pages,
789                                           sector_t *blocks, int create)
790 {
791         int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
792         pgoff_t bitmap_max_page_index;
793         sector_t *b;
794         int rc = 0, i;
795
796         bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
797                                 PAGE_SHIFT;
798         for (i = 0, b = blocks; i < pages; i++, page++) {
799                 if ((*page)->index + 1 >= bitmap_max_page_index) {
800                         rc = -EFBIG;
801                         break;
802                 }
803                 rc = ldiskfs_map_inode_page(inode, *page, b, create);
804                 if (rc) {
805                         CERROR("ino %lu, blk %llu create %d: rc %d\n",
806                                inode->i_ino,
807                                (unsigned long long)*b, create, rc);
808                         break;
809                 }
810                 b += blocks_per_page;
811         }
812         return rc;
813 }
814
815 static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
816                                            struct page **page,
817                                            int pages, sector_t *blocks,
818                                            int create)
819 {
820         int rc = 0, i = 0, clen = 0;
821         struct page *fp = NULL;
822
823         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
824                 inode->i_ino, pages, (*page)->index);
825
826         /* pages are sorted already. so, we just have to find
827          * contig. space and process them properly */
828         while (i < pages) {
829                 if (fp == NULL) {
830                         /* start new extent */
831                         fp = *page++;
832                         clen = 1;
833                         i++;
834                         continue;
835                 } else if (fp->index + clen == (*page)->index) {
836                         /* continue the extent */
837                         page++;
838                         clen++;
839                         i++;
840                         continue;
841                 }
842
843                 /* process found extent */
844                 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
845                                              blocks, create);
846                 if (rc)
847                         GOTO(cleanup, rc);
848
849                 /* look for next extent */
850                 fp = NULL;
851                 blocks += clen * (PAGE_CACHE_SIZE >> inode->i_blkbits);
852         }
853
854         if (fp)
855                 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
856                                              blocks, create);
857
858 cleanup:
859         return rc;
860 }
861
862 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
863                                        int pages, sector_t *blocks,
864                                        int create)
865 {
866         int rc;
867
868         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
869                 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
870                                                      blocks, create);
871                 return rc;
872         }
873         rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
874
875         return rc;
876 }
877 #else
878 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
879                                        int pages, sector_t *blocks,
880                                        int create)
881 {
882         int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
883         int rc = 0, i = 0;
884         struct page *fp = NULL;
885         int clen = 0;
886         pgoff_t max_page_index;
887
888         max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
889
890         CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
891                 inode->i_ino, pages, (*page)->index);
892
893         /* pages are sorted already. so, we just have to find
894          * contig. space and process them properly */
895         while (i < pages) {
896                 long blen, total = 0;
897                 handle_t *handle = NULL;
898                 struct ldiskfs_map_blocks map = { 0 };
899
900                 if (fp == NULL) { /* start new extent */
901                         fp = *page++;
902                         clen = 1;
903                         if (++i != pages)
904                                 continue;
905                 } else if (fp->index + clen == (*page)->index) {
906                         /* continue the extent */
907                         page++;
908                         clen++;
909                         if (++i != pages)
910                                 continue;
911                 }
912                 if (fp->index + clen >= max_page_index)
913                         GOTO(cleanup, rc = -EFBIG);
914                 /* process found extent */
915                 map.m_lblk = fp->index * blocks_per_page;
916                 map.m_len = blen = clen * blocks_per_page;
917                 if (create) {
918                         create = LDISKFS_GET_BLOCKS_CREATE;
919                         handle = ldiskfs_journal_current_handle();
920                         LASSERT(handle != NULL);
921                 }
922 cont_map:
923                 rc = ldiskfs_map_blocks(handle, inode, &map, create);
924                 if (rc >= 0) {
925                         int c = 0;
926                         for (; total < blen && c < map.m_len; c++, total++) {
927                                 if (rc == 0) {
928                                         *(blocks + total) = 0;
929                                         total++;
930                                         break;
931                                 } else {
932                                         *(blocks + total) = map.m_pblk + c;
933                                         /* unmap any possible underlying
934                                          * metadata from the block device
935                                          * mapping.  bug 6998. */
936                                         if ((map.m_flags & LDISKFS_MAP_NEW) &&
937                                             create)
938                                                 unmap_underlying_metadata(
939                                                         inode->i_sb->s_bdev,
940                                                         map.m_pblk + c);
941                                 }
942                         }
943                         rc = 0;
944                 }
945                 if (rc == 0 && total < blen) {
946                         map.m_lblk = fp->index * blocks_per_page + total;
947                         map.m_len = blen - total;
948                         goto cont_map;
949                 }
950                 if (rc != 0)
951                         GOTO(cleanup, rc);
952
953                 /* look for next extent */
954                 fp = NULL;
955                 blocks += blocks_per_page * clen;
956         }
957 cleanup:
958         return rc;
959 }
960 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
961
962 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
963                           struct niobuf_local *lnb, int npages)
964 {
965         struct osd_thread_info *oti   = osd_oti_get(env);
966         struct osd_iobuf       *iobuf = &oti->oti_iobuf;
967         struct inode           *inode = osd_dt_obj(dt)->oo_inode;
968         struct osd_device      *osd   = osd_obj2dev(osd_dt_obj(dt));
969         struct timeval          start;
970         struct timeval          end;
971         unsigned long           timediff;
972         ssize_t                 isize;
973         __s64                   maxidx;
974         int                     rc = 0;
975         int                     i;
976         int                     cache = 0;
977
978         LASSERT(inode);
979
980         rc = osd_init_iobuf(osd, iobuf, 0, npages);
981         if (unlikely(rc != 0))
982                 RETURN(rc);
983
984         isize = i_size_read(inode);
985         maxidx = ((isize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 1;
986
987         if (osd->od_writethrough_cache)
988                 cache = 1;
989         if (isize > osd->od_readcache_max_filesize)
990                 cache = 0;
991
992         do_gettimeofday(&start);
993         for (i = 0; i < npages; i++) {
994
995                 if (cache == 0)
996                         generic_error_remove_page(inode->i_mapping,
997                                                   lnb[i].lnb_page);
998
999                 /*
1000                  * till commit the content of the page is undefined
1001                  * we'll set it uptodate once bulk is done. otherwise
1002                  * subsequent reads can access non-stable data
1003                  */
1004                 ClearPageUptodate(lnb[i].lnb_page);
1005
1006                 if (lnb[i].lnb_len == PAGE_CACHE_SIZE)
1007                         continue;
1008
1009                 if (maxidx >= lnb[i].lnb_page->index) {
1010                         osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1011                 } else {
1012                         long off;
1013                         char *p = kmap(lnb[i].lnb_page);
1014
1015                         off = lnb[i].lnb_page_offset;
1016                         if (off)
1017                                 memset(p, 0, off);
1018                         off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1019                               ~PAGE_MASK;
1020                         if (off)
1021                                 memset(p + off, 0, PAGE_CACHE_SIZE - off);
1022                         kunmap(lnb[i].lnb_page);
1023                 }
1024         }
1025         do_gettimeofday(&end);
1026         timediff = cfs_timeval_sub(&end, &start, NULL);
1027         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1028
1029         if (iobuf->dr_npages) {
1030                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1031                                                  iobuf->dr_npages,
1032                                                  iobuf->dr_blocks, 0);
1033                 if (likely(rc == 0)) {
1034                         rc = osd_do_bio(osd, inode, iobuf);
1035                         /* do IO stats for preparation reads */
1036                         osd_fini_iobuf(osd, iobuf);
1037                 }
1038         }
1039         RETURN(rc);
1040 }
1041
1042 struct osd_fextent {
1043         sector_t        start;
1044         sector_t        end;
1045         unsigned int    mapped:1;
1046 };
1047
1048 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1049                          struct osd_fextent *cached_extent)
1050 {
1051         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1052         sector_t block = offset >> inode->i_blkbits;
1053         sector_t start;
1054         struct fiemap_extent_info fei = { 0 };
1055         struct fiemap_extent fe = { 0 };
1056         mm_segment_t saved_fs;
1057         int rc;
1058
1059         if (block >= cached_extent->start && block < cached_extent->end)
1060                 return cached_extent->mapped;
1061
1062         if (i_size_read(inode) == 0)
1063                 return 0;
1064
1065         /* Beyond EOF, must not be mapped */
1066         if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1067                 return 0;
1068
1069         fei.fi_extents_max = 1;
1070         fei.fi_extents_start = &fe;
1071
1072         saved_fs = get_fs();
1073         set_fs(get_ds());
1074         rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1075         set_fs(saved_fs);
1076         if (rc != 0)
1077                 return 0;
1078
1079         start = fe.fe_logical >> inode->i_blkbits;
1080
1081         if (start > block) {
1082                 cached_extent->start = block;
1083                 cached_extent->end = start;
1084                 cached_extent->mapped = 0;
1085         } else {
1086                 cached_extent->start = start;
1087                 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1088                                       inode->i_blkbits;
1089                 cached_extent->mapped = 1;
1090         }
1091
1092         return cached_extent->mapped;
1093 }
1094
1095 static int osd_declare_write_commit(const struct lu_env *env,
1096                                     struct dt_object *dt,
1097                                     struct niobuf_local *lnb, int npages,
1098                                     struct thandle *handle)
1099 {
1100         const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1101         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1102         struct osd_thandle      *oh;
1103         int                      extents = 1;
1104         int                      depth;
1105         int                      i;
1106         int                      newblocks;
1107         int                      rc = 0;
1108         int                      flags = 0;
1109         int                      credits = 0;
1110         bool                     ignore_quota = false;
1111         long long                quota_space = 0;
1112         struct osd_fextent       extent = { 0 };
1113         ENTRY;
1114
1115         LASSERT(handle != NULL);
1116         oh = container_of0(handle, struct osd_thandle, ot_super);
1117         LASSERT(oh->ot_handle == NULL);
1118
1119         newblocks = npages;
1120
1121         /* calculate number of extents (probably better to pass nb) */
1122         for (i = 0; i < npages; i++) {
1123                 if (i && lnb[i].lnb_file_offset !=
1124                     lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1125                         extents++;
1126
1127                 if (!osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent))
1128                         quota_space += PAGE_CACHE_SIZE;
1129
1130                 /* ignore quota for the whole request if any page is from
1131                  * client cache or written by root.
1132                  *
1133                  * XXX once we drop the 1.8 client support, the checking
1134                  * for whether page is from cache can be simplified as:
1135                  * !(lnb[i].flags & OBD_BRW_SYNC)
1136                  *
1137                  * XXX we could handle this on per-lnb basis as done by
1138                  * grant. */
1139                 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1140                     (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1141                     OBD_BRW_FROM_GRANT)
1142                         ignore_quota = true;
1143         }
1144
1145         /*
1146          * each extent can go into new leaf causing a split
1147          * 5 is max tree depth: inode + 4 index blocks
1148          * with blockmaps, depth is 3 at most
1149          */
1150         if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1151                 /*
1152                  * many concurrent threads may grow tree by the time
1153                  * our transaction starts. so, consider 2 is a min depth
1154                  */
1155                 depth = ext_depth(inode);
1156                 depth = max(depth, 1) + 1;
1157                 newblocks += depth;
1158                 credits++; /* inode */
1159                 credits += depth * 2 * extents;
1160         } else {
1161                 depth = 3;
1162                 newblocks += depth;
1163                 credits++; /* inode */
1164                 credits += depth * extents;
1165         }
1166
1167         /* quota space for metadata blocks */
1168         quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1169
1170         /* quota space should be reported in 1K blocks */
1171         quota_space = toqb(quota_space);
1172
1173         /* each new block can go in different group (bitmap + gd) */
1174
1175         /* we can't dirty more bitmap blocks than exist */
1176         if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1177                 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1178         else
1179                 credits += newblocks;
1180
1181         /* we can't dirty more gd blocks than exist */
1182         if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1183                 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1184         else
1185                 credits += newblocks;
1186
1187         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1188
1189         /* make sure the over quota flags were not set */
1190         lnb[0].lnb_flags &= ~(OBD_BRW_OVER_USRQUOTA | OBD_BRW_OVER_GRPQUOTA);
1191
1192         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1193                                    quota_space, oh, osd_dt_obj(dt), true,
1194                                    &flags, ignore_quota);
1195
1196         /* we need only to store the overquota flags in the first lnb for
1197          * now, once we support multiple objects BRW, this code needs be
1198          * revised. */
1199         if (flags & QUOTA_FL_OVER_USRQUOTA)
1200                 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1201         if (flags & QUOTA_FL_OVER_GRPQUOTA)
1202                 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1203
1204         RETURN(rc);
1205 }
1206
1207 /* Check if a block is allocated or not */
1208 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1209                             struct niobuf_local *lnb, int npages,
1210                             struct thandle *thandle)
1211 {
1212         struct osd_thread_info *oti = osd_oti_get(env);
1213         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1214         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1215         struct osd_device  *osd = osd_obj2dev(osd_dt_obj(dt));
1216         loff_t isize;
1217         int rc = 0, i;
1218         struct osd_fextent extent = { 0 };
1219
1220         LASSERT(inode);
1221
1222         rc = osd_init_iobuf(osd, iobuf, 1, npages);
1223         if (unlikely(rc != 0))
1224                 RETURN(rc);
1225
1226         isize = i_size_read(inode);
1227         ll_vfs_dq_init(inode);
1228
1229         for (i = 0; i < npages; i++) {
1230                 if (lnb[i].lnb_rc == -ENOSPC &&
1231                     osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent)) {
1232                         /* Allow the write to proceed if overwriting an
1233                          * existing block */
1234                         lnb[i].lnb_rc = 0;
1235                 }
1236
1237                 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1238                         CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1239                                lnb[i].lnb_rc);
1240                         LASSERT(lnb[i].lnb_page);
1241                         generic_error_remove_page(inode->i_mapping,
1242                                                   lnb[i].lnb_page);
1243                         continue;
1244                 }
1245
1246                 LASSERT(PageLocked(lnb[i].lnb_page));
1247                 LASSERT(!PageWriteback(lnb[i].lnb_page));
1248
1249                 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1250                         isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1251
1252                 /*
1253                  * Since write and truncate are serialized by oo_sem, even
1254                  * partial-page truncate should not leave dirty pages in the
1255                  * page cache.
1256                  */
1257                 LASSERT(!PageDirty(lnb[i].lnb_page));
1258
1259                 SetPageUptodate(lnb[i].lnb_page);
1260
1261                 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1262         }
1263
1264         osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1265
1266         if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1267                 rc = -ENOSPC;
1268         } else if (iobuf->dr_npages > 0) {
1269                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1270                                                  iobuf->dr_npages,
1271                                                  iobuf->dr_blocks, 1);
1272         } else {
1273                 /* no pages to write, no transno is needed */
1274                 thandle->th_local = 1;
1275         }
1276
1277         if (likely(rc == 0)) {
1278                 if (isize > i_size_read(inode)) {
1279                         i_size_write(inode, isize);
1280                         LDISKFS_I(inode)->i_disksize = isize;
1281                         ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1282                 }
1283
1284                 rc = osd_do_bio(osd, inode, iobuf);
1285                 /* we don't do stats here as in read path because
1286                  * write is async: we'll do this in osd_put_bufs() */
1287         } else {
1288                 osd_fini_iobuf(osd, iobuf);
1289         }
1290
1291         osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1292
1293         if (unlikely(rc != 0)) {
1294                 /* if write fails, we should drop pages from the cache */
1295                 for (i = 0; i < npages; i++) {
1296                         if (lnb[i].lnb_page == NULL)
1297                                 continue;
1298                         LASSERT(PageLocked(lnb[i].lnb_page));
1299                         generic_error_remove_page(inode->i_mapping,
1300                                                   lnb[i].lnb_page);
1301                 }
1302         }
1303
1304         RETURN(rc);
1305 }
1306
1307 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1308                          struct niobuf_local *lnb, int npages)
1309 {
1310         struct osd_thread_info *oti = osd_oti_get(env);
1311         struct osd_iobuf *iobuf = &oti->oti_iobuf;
1312         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1313         struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1314         struct timeval start, end;
1315         unsigned long timediff;
1316         int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0;
1317         loff_t isize;
1318
1319         LASSERT(inode);
1320
1321         rc = osd_init_iobuf(osd, iobuf, 0, npages);
1322         if (unlikely(rc != 0))
1323                 RETURN(rc);
1324
1325         isize = i_size_read(inode);
1326
1327         if (osd->od_read_cache)
1328                 cache = 1;
1329         if (isize > osd->od_readcache_max_filesize)
1330                 cache = 0;
1331
1332         do_gettimeofday(&start);
1333         for (i = 0; i < npages; i++) {
1334
1335                 if (isize <= lnb[i].lnb_file_offset)
1336                         /* If there's no more data, abort early.
1337                          * lnb->lnb_rc == 0, so it's easy to detect later. */
1338                         break;
1339
1340                 if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len)
1341                         lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset;
1342                 else
1343                         lnb[i].lnb_rc = lnb[i].lnb_len;
1344
1345                 if (PageUptodate(lnb[i].lnb_page)) {
1346                         cache_hits++;
1347                 } else {
1348                         cache_misses++;
1349                         osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1350                 }
1351
1352                 if (cache == 0)
1353                         generic_error_remove_page(inode->i_mapping,
1354                                                   lnb[i].lnb_page);
1355         }
1356         do_gettimeofday(&end);
1357         timediff = cfs_timeval_sub(&end, &start, NULL);
1358         lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1359
1360         if (cache_hits != 0)
1361                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1362                                     cache_hits);
1363         if (cache_misses != 0)
1364                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1365                                     cache_misses);
1366         if (cache_hits + cache_misses != 0)
1367                 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1368                                     cache_hits + cache_misses);
1369
1370         if (iobuf->dr_npages) {
1371                 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1372                                                  iobuf->dr_npages,
1373                                                  iobuf->dr_blocks, 0);
1374                 rc = osd_do_bio(osd, inode, iobuf);
1375
1376                 /* IO stats will be done in osd_bufs_put() */
1377         }
1378
1379         RETURN(rc);
1380 }
1381
1382 /*
1383  * XXX: Another layering violation for now.
1384  *
1385  * We don't want to use ->f_op->read methods, because generic file write
1386  *
1387  *         - serializes on ->i_sem, and
1388  *
1389  *         - does a lot of extra work like balance_dirty_pages(),
1390  *
1391  * which doesn't work for globally shared files like /last_rcvd.
1392  */
1393 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1394 {
1395         struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1396
1397         memcpy(buffer, (char *)ei->i_data, buflen);
1398
1399         return  buflen;
1400 }
1401
1402 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1403 {
1404         struct buffer_head *bh;
1405         unsigned long block;
1406         int osize;
1407         int blocksize;
1408         int csize;
1409         int boffs;
1410         int err = 0;
1411
1412         /* prevent reading after eof */
1413         spin_lock(&inode->i_lock);
1414         if (i_size_read(inode) < *offs + size) {
1415                 loff_t diff = i_size_read(inode) - *offs;
1416                 spin_unlock(&inode->i_lock);
1417                 if (diff < 0) {
1418                         CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1419                                i_size_read(inode), *offs);
1420                         return -EBADR;
1421                 } else if (diff == 0) {
1422                         return 0;
1423                 } else {
1424                         size = diff;
1425                 }
1426         } else {
1427                 spin_unlock(&inode->i_lock);
1428         }
1429
1430         blocksize = 1 << inode->i_blkbits;
1431         osize = size;
1432         while (size > 0) {
1433                 block = *offs >> inode->i_blkbits;
1434                 boffs = *offs & (blocksize - 1);
1435                 csize = min(blocksize - boffs, size);
1436                 bh = ldiskfs_bread(NULL, inode, block, 0, &err);
1437                 if (err != 0) {
1438                         CERROR("%s: can't read %u@%llu on ino %lu: rc = %d\n",
1439                                LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
1440                                csize, *offs, inode->i_ino, err);
1441                         if (bh != NULL)
1442                                 brelse(bh);
1443                         return err;
1444                 }
1445
1446                 if (bh != NULL) {
1447                         memcpy(buf, bh->b_data + boffs, csize);
1448                         brelse(bh);
1449                 } else {
1450                         memset(buf, 0, csize);
1451                 }
1452
1453                 *offs += csize;
1454                 buf += csize;
1455                 size -= csize;
1456         }
1457         return osize;
1458 }
1459
1460 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1461                         struct lu_buf *buf, loff_t *pos)
1462 {
1463         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1464         int           rc;
1465
1466         /* Read small symlink from inode body as we need to maintain correct
1467          * on-disk symlinks for ldiskfs.
1468          */
1469         if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1470             (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1471                 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1472         else
1473                 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1474
1475         return rc;
1476 }
1477
1478 static inline int osd_extents_enabled(struct super_block *sb,
1479                                       struct inode *inode)
1480 {
1481         if (inode != NULL) {
1482                 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1483                         return 1;
1484         } else if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
1485                                 LDISKFS_FEATURE_INCOMPAT_EXTENTS)) {
1486                 return 1;
1487         }
1488         return 0;
1489 }
1490
1491 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1492                            const loff_t size, const loff_t pos,
1493                            const int blocks)
1494 {
1495         int credits, bits, bs, i;
1496
1497         bits = sb->s_blocksize_bits;
1498         bs = 1 << bits;
1499
1500         /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1501          * we do not expect blockmaps on the large files,
1502          * so let's shrink it to 2 levels (4GB files) */
1503
1504         /* this is default reservation: 2 levels */
1505         credits = (blocks + 2) * 3;
1506
1507         /* actual offset is unknown, hard to optimize */
1508         if (pos == -1)
1509                 return credits;
1510
1511         /* now check for few specific cases to optimize */
1512         if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1513                 /* no indirects */
1514                 credits = blocks;
1515                 /* allocate if not allocated */
1516                 if (inode == NULL) {
1517                         credits += blocks * 2;
1518                         return credits;
1519                 }
1520                 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1521                         LASSERT(i < LDISKFS_NDIR_BLOCKS);
1522                         if (LDISKFS_I(inode)->i_data[i] == 0)
1523                                 credits += 2;
1524                 }
1525         } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1526                 /* single indirect */
1527                 credits = blocks * 3;
1528                 if (inode == NULL ||
1529                     LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1530                         credits += 3;
1531                 else
1532                         /* The indirect block may be modified. */
1533                         credits += 1;
1534         }
1535
1536         return credits;
1537 }
1538
1539 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1540                                  const struct lu_buf *buf, loff_t _pos,
1541                                  struct thandle *handle)
1542 {
1543         struct osd_object  *obj  = osd_dt_obj(dt);
1544         struct inode       *inode = obj->oo_inode;
1545         struct super_block *sb = osd_sb(osd_obj2dev(obj));
1546         struct osd_thandle *oh;
1547         int                 rc = 0, est = 0, credits, blocks, allocated = 0;
1548         int                 bits, bs;
1549         int                 depth, size;
1550         loff_t              pos;
1551         ENTRY;
1552
1553         LASSERT(buf != NULL);
1554         LASSERT(handle != NULL);
1555
1556         oh = container_of0(handle, struct osd_thandle, ot_super);
1557         LASSERT(oh->ot_handle == NULL);
1558
1559         size = buf->lb_len;
1560         bits = sb->s_blocksize_bits;
1561         bs = 1 << bits;
1562
1563         if (_pos == -1) {
1564                 /* if this is an append, then we
1565                  * should expect cross-block record */
1566                 pos = 0;
1567         } else {
1568                 pos = _pos;
1569         }
1570
1571         /* blocks to modify */
1572         blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1573         LASSERT(blocks > 0);
1574
1575         if (inode != NULL && _pos != -1) {
1576                 /* object size in blocks */
1577                 est = (i_size_read(inode) + bs - 1) >> bits;
1578                 allocated = inode->i_blocks >> (bits - 9);
1579                 if (pos + size <= i_size_read(inode) && est <= allocated) {
1580                         /* looks like an overwrite, no need to modify tree */
1581                         credits = blocks;
1582                         /* no need to modify i_size */
1583                         goto out;
1584                 }
1585         }
1586
1587         if (osd_extents_enabled(sb, inode)) {
1588                 /*
1589                  * many concurrent threads may grow tree by the time
1590                  * our transaction starts. so, consider 2 is a min depth
1591                  * for every level we may need to allocate a new block
1592                  * and take some entries from the old one. so, 3 blocks
1593                  * to allocate (bitmap, gd, itself) + old block - 4 per
1594                  * level.
1595                  */
1596                 depth = inode != NULL ? ext_depth(inode) : 0;
1597                 depth = max(depth, 1) + 1;
1598                 credits = depth;
1599                 /* if not append, then split may need to modify
1600                  * existing blocks moving entries into the new ones */
1601                 if (_pos == -1)
1602                         credits += depth;
1603                 /* blocks to store data: bitmap,gd,itself */
1604                 credits += blocks * 3;
1605         } else {
1606                 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1607         }
1608         /* if inode is created as part of the transaction,
1609          * then it's counted already by the creation method */
1610         if (inode != NULL)
1611                 credits++;
1612
1613 out:
1614
1615         osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1616
1617         /* dt_declare_write() is usually called for system objects, such
1618          * as llog or last_rcvd files. We needn't enforce quota on those
1619          * objects, so always set the lqi_space as 0. */
1620         if (inode != NULL)
1621                 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1622                                            i_gid_read(inode), 0, oh, obj, true,
1623                                            NULL, false);
1624         RETURN(rc);
1625 }
1626
1627 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1628 {
1629         /* LU-2634: clear the extent format for fast symlink */
1630         ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1631
1632         memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1633         LDISKFS_I(inode)->i_disksize = buflen;
1634         i_size_write(inode, buflen);
1635         ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1636
1637         return 0;
1638 }
1639
1640 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1641                              int write_NUL, loff_t *offs, handle_t *handle)
1642 {
1643         struct buffer_head *bh        = NULL;
1644         loff_t              offset    = *offs;
1645         loff_t              new_size  = i_size_read(inode);
1646         unsigned long       block;
1647         int                 blocksize = 1 << inode->i_blkbits;
1648         int                 err = 0;
1649         int                 size;
1650         int                 boffs;
1651         int                 dirty_inode = 0;
1652
1653         if (write_NUL) {
1654                 /*
1655                  * long symlink write does not count the NUL terminator in
1656                  * bufsize, we write it, and the inode's file size does not
1657                  * count the NUL terminator as well.
1658                  */
1659                 ((char *)buf)[bufsize] = '\0';
1660                 ++bufsize;
1661         }
1662         while (bufsize > 0) {
1663                 if (bh != NULL)
1664                         brelse(bh);
1665
1666                 block = offset >> inode->i_blkbits;
1667                 boffs = offset & (blocksize - 1);
1668                 size = min(blocksize - boffs, bufsize);
1669                 bh = ldiskfs_bread(handle, inode, block, 1, &err);
1670                 if (!bh) {
1671                         err = err ? err : -EIO;
1672                         CERROR("%s: error reading offset %llu (block %lu): "
1673                                "rc = %d\n",
1674                                inode->i_sb->s_id, offset, block, err);
1675                         break;
1676                 }
1677
1678                 err = ldiskfs_journal_get_write_access(handle, bh);
1679                 if (err) {
1680                         CERROR("journal_get_write_access() returned error %d\n",
1681                                err);
1682                         break;
1683                 }
1684                 LASSERTF(boffs + size <= bh->b_size,
1685                          "boffs %d size %d bh->b_size %lu\n",
1686                          boffs, size, (unsigned long)bh->b_size);
1687                 memcpy(bh->b_data + boffs, buf, size);
1688                 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
1689                 if (err)
1690                         break;
1691
1692                 if (offset + size > new_size)
1693                         new_size = offset + size;
1694                 offset += size;
1695                 bufsize -= size;
1696                 buf += size;
1697         }
1698         if (bh)
1699                 brelse(bh);
1700
1701         if (write_NUL)
1702                 --new_size;
1703         /* correct in-core and on-disk sizes */
1704         if (new_size > i_size_read(inode)) {
1705                 spin_lock(&inode->i_lock);
1706                 if (new_size > i_size_read(inode))
1707                         i_size_write(inode, new_size);
1708                 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1709                         LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1710                         dirty_inode = 1;
1711                 }
1712                 spin_unlock(&inode->i_lock);
1713                 if (dirty_inode)
1714                         ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1715         }
1716
1717         if (err == 0)
1718                 *offs = offset;
1719         return err;
1720 }
1721
1722 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1723                          const struct lu_buf *buf, loff_t *pos,
1724                          struct thandle *handle, int ignore_quota)
1725 {
1726         struct inode            *inode = osd_dt_obj(dt)->oo_inode;
1727         struct osd_thandle      *oh;
1728         ssize_t                 result;
1729         int                     is_link;
1730
1731         LASSERT(dt_object_exists(dt));
1732
1733         LASSERT(handle != NULL);
1734         LASSERT(inode != NULL);
1735         ll_vfs_dq_init(inode);
1736
1737         /* XXX: don't check: one declared chunk can be used many times */
1738         /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1739
1740         oh = container_of(handle, struct osd_thandle, ot_super);
1741         LASSERT(oh->ot_handle->h_transaction != NULL);
1742         osd_trans_exec_op(env, handle, OSD_OT_WRITE);
1743
1744         /* Write small symlink to inode body as we need to maintain correct
1745          * on-disk symlinks for ldiskfs.
1746          * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1747          * does not count it in.
1748          */
1749         is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1750         if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1751                 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1752         else
1753                 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1754                                                   buf->lb_len, is_link, pos,
1755                                                   oh->ot_handle);
1756         if (result == 0)
1757                 result = buf->lb_len;
1758
1759         osd_trans_exec_check(env, handle, OSD_OT_WRITE);
1760
1761         return result;
1762 }
1763
1764 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1765                              __u64 start, __u64 end, struct thandle *th)
1766 {
1767         struct osd_thandle *oh;
1768         struct inode       *inode;
1769         int                 rc;
1770         ENTRY;
1771
1772         LASSERT(th);
1773         oh = container_of(th, struct osd_thandle, ot_super);
1774
1775         /*
1776          * we don't need to reserve credits for whole truncate
1777          * it's not possible as truncate may need to free too many
1778          * blocks and that won't fit a single transaction. instead
1779          * we reserve credits to change i_size and put inode onto
1780          * orphan list. if needed truncate will extend or restart
1781          * transaction
1782          */
1783         osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1784                              osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1785
1786         inode = osd_dt_obj(dt)->oo_inode;
1787         LASSERT(inode);
1788
1789         rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1790                                    0, oh, osd_dt_obj(dt), true, NULL, false);
1791         RETURN(rc);
1792 }
1793
1794 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1795                      __u64 start, __u64 end, struct thandle *th)
1796 {
1797         struct osd_thandle *oh;
1798         struct osd_object  *obj = osd_dt_obj(dt);
1799         struct inode       *inode = obj->oo_inode;
1800         handle_t           *h;
1801         tid_t               tid;
1802         int                rc = 0, rc2 = 0;
1803         ENTRY;
1804
1805         LASSERT(end == OBD_OBJECT_EOF);
1806         LASSERT(dt_object_exists(dt));
1807         LASSERT(osd_invariant(obj));
1808         LASSERT(inode != NULL);
1809         ll_vfs_dq_init(inode);
1810
1811         LASSERT(th);
1812         oh = container_of(th, struct osd_thandle, ot_super);
1813         LASSERT(oh->ot_handle->h_transaction != NULL);
1814
1815         osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1816
1817         tid = oh->ot_handle->h_transaction->t_tid;
1818
1819         i_size_write(inode, start);
1820         ll_truncate_pagecache(inode, start);
1821 #ifdef HAVE_INODEOPS_TRUNCATE
1822         if (inode->i_op->truncate) {
1823                 inode->i_op->truncate(inode);
1824         } else
1825 #endif
1826                 ldiskfs_truncate(inode);
1827
1828         /*
1829          * For a partial-page truncate, flush the page to disk immediately to
1830          * avoid data corruption during direct disk write.  b=17397
1831          */
1832         if ((start & ~PAGE_MASK) != 0)
1833                 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1834
1835         h = journal_current_handle();
1836         LASSERT(h != NULL);
1837         LASSERT(h == oh->ot_handle);
1838
1839         /* do not check credits with osd_trans_exec_check() as the truncate
1840          * can restart the transaction internally and we restart the
1841          * transaction in this case */
1842
1843         if (tid != h->h_transaction->t_tid) {
1844                 int credits = oh->ot_credits;
1845                 /*
1846                  * transaction has changed during truncate
1847                  * we need to restart the handle with our credits
1848                  */
1849                 if (h->h_buffer_credits < credits) {
1850                         if (ldiskfs_journal_extend(h, credits))
1851                                 rc2 = ldiskfs_journal_restart(h, credits);
1852                 }
1853         }
1854
1855         RETURN(rc == 0 ? rc2 : rc);
1856 }
1857
1858 static int fiemap_check_ranges(struct inode *inode,
1859                                u64 start, u64 len, u64 *new_len)
1860 {
1861         loff_t maxbytes;
1862
1863         *new_len = len;
1864
1865         if (len == 0)
1866                 return -EINVAL;
1867
1868         if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
1869                 maxbytes = inode->i_sb->s_maxbytes;
1870         else
1871                 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
1872
1873         if (start > maxbytes)
1874                 return -EFBIG;
1875
1876         /*
1877          * Shrink request scope to what the fs can actually handle.
1878          */
1879         if (len > maxbytes || (maxbytes - len) < start)
1880                 *new_len = maxbytes - start;
1881
1882         return 0;
1883 }
1884
1885 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1886 #define FIEMAP_MAX_EXTENTS     (UINT_MAX / sizeof(struct fiemap_extent))
1887
1888 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1889                           struct fiemap *fm)
1890 {
1891         struct fiemap_extent_info fieinfo = {0, };
1892         struct inode *inode = osd_dt_obj(dt)->oo_inode;
1893         u64 len;
1894         int rc;
1895
1896
1897         LASSERT(inode);
1898         if (inode->i_op->fiemap == NULL)
1899                 return -EOPNOTSUPP;
1900
1901         if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
1902                 return -EINVAL;
1903
1904         rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
1905         if (rc)
1906                 return rc;
1907
1908         fieinfo.fi_flags = fm->fm_flags;
1909         fieinfo.fi_extents_max = fm->fm_extent_count;
1910         fieinfo.fi_extents_start = fm->fm_extents;
1911
1912         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
1913                 filemap_write_and_wait(inode->i_mapping);
1914
1915         rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
1916         fm->fm_flags = fieinfo.fi_flags;
1917         fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
1918
1919         return rc;
1920 }
1921
1922 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
1923                        __u64 start, __u64 end, enum lu_ladvise_type advice)
1924 {
1925         int     rc;
1926         ENTRY;
1927
1928         switch (advice) {
1929         default:
1930                 rc = -ENOTSUPP;
1931                 break;
1932         }
1933
1934         RETURN(rc);
1935 }
1936
1937 /*
1938  * in some cases we may need declare methods for objects being created
1939  * e.g., when we create symlink
1940  */
1941 const struct dt_body_operations osd_body_ops_new = {
1942         .dbo_declare_write = osd_declare_write,
1943 };
1944
1945 const struct dt_body_operations osd_body_ops = {
1946         .dbo_read                       = osd_read,
1947         .dbo_declare_write              = osd_declare_write,
1948         .dbo_write                      = osd_write,
1949         .dbo_bufs_get                   = osd_bufs_get,
1950         .dbo_bufs_put                   = osd_bufs_put,
1951         .dbo_write_prep                 = osd_write_prep,
1952         .dbo_declare_write_commit       = osd_declare_write_commit,
1953         .dbo_write_commit               = osd_write_commit,
1954         .dbo_read_prep                  = osd_read_prep,
1955         .dbo_declare_punch              = osd_declare_punch,
1956         .dbo_punch                      = osd_punch,
1957         .dbo_fiemap_get                 = osd_fiemap_get,
1958         .dbo_ladvise                    = osd_ladvise,
1959 };
1960