4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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
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
27 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
40 * Author: Nikita Danilov <nikita@clusterfs.com>
41 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
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 */
53 * struct OBD_{ALLOC,FREE}*()
56 #include <obd_support.h>
58 #include "osd_internal.h"
61 #include <ldiskfs/ldiskfs_extents.h>
63 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
64 int rw, int line, int pages)
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,
72 LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
74 init_waitqueue_head(&iobuf->dr_wait);
75 atomic_set(&iobuf->dr_numreqs, 0);
80 iobuf->dr_elapsed = 0;
81 /* must be counted before, so assert */
83 iobuf->dr_init_at = line;
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]));
92 /* start with 1MB for 4K blocks */
94 while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
97 CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
98 (unsigned)(pages * sizeof(iobuf->dr_pages[0])), i, pages);
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);
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))
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))
115 iobuf->dr_max_pages = pages;
119 #define osd_init_iobuf(dev, iobuf, rw, pages) \
120 __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages)
122 static void osd_iobuf_add_page(struct osd_iobuf *iobuf, struct page *page)
124 LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
125 iobuf->dr_pages[iobuf->dr_npages++] = page;
128 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
130 int rw = iobuf->dr_rw;
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],
139 lprocfs_oh_tally_log2(&d->od_brw_stats.hist[BRW_R_IO_TIME+rw],
144 #ifndef REQ_WRITE /* pre-2.6.35 */
145 #define __REQ_WRITE BIO_RW
148 static void dio_complete_routine(struct bio *bio, int error)
150 struct osd_iobuf *iobuf = bio->bi_private;
154 /* CAVEAT EMPTOR: possibly in IRQ context
155 * DO NOT record procfs stats here!!! */
157 if (unlikely(iobuf == NULL)) {
158 CERROR("***** bio->bi_private is NULL! This should never "
159 "happen. Normally, I would crash here, but instead I "
160 "will dump the bio contents to the console. Please "
161 "report this to <https://jira.hpdd.intel.com/> , along "
162 "with any interesting messages leading up to this point "
163 "(like SCSI errors, perhaps). Because bi_private is "
164 "NULL, I can't wake up the thread that initiated this "
165 "IO - you will probably have to reboot this node.\n");
166 CERROR("bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d, "
167 "bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, "
168 "bi_private: %p\n", bio->bi_next, bio->bi_flags,
169 bio->bi_rw, bio->bi_vcnt, bio->bi_idx, bio->bi_size,
170 bio->bi_end_io, atomic_read(&bio->bi_cnt),
175 /* the check is outside of the cycle for performance reason -bzzz */
176 if (!test_bit(__REQ_WRITE, &bio->bi_rw)) {
177 bio_for_each_segment(bvl, bio, i) {
178 if (likely(error == 0))
179 SetPageUptodate(bvl->bv_page);
180 LASSERT(PageLocked(bvl->bv_page));
182 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
184 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
187 /* any real error is good enough -bzzz */
188 if (error != 0 && iobuf->dr_error == 0)
189 iobuf->dr_error = error;
192 * set dr_elapsed before dr_numreqs turns to 0, otherwise
193 * it's possible that service thread will see dr_numreqs
194 * is zero, but dr_elapsed is not set yet, leading to lost
195 * data in this processing and an assertion in a subsequent
198 if (atomic_read(&iobuf->dr_numreqs) == 1) {
199 iobuf->dr_elapsed = jiffies - iobuf->dr_start_time;
200 iobuf->dr_elapsed_valid = 1;
202 if (atomic_dec_and_test(&iobuf->dr_numreqs))
203 wake_up(&iobuf->dr_wait);
205 /* Completed bios used to be chained off iobuf->dr_bios and freed in
206 * filter_clear_dreq(). It was then possible to exhaust the biovec-256
207 * mempool when serious on-disk fragmentation was encountered,
208 * deadlocking the OST. The bios are now released as soon as complete
209 * so the pool cannot be exhausted while IOs are competing. bug 10076 */
213 static void record_start_io(struct osd_iobuf *iobuf, int size)
215 struct osd_device *osd = iobuf->dr_dev;
216 struct obd_histogram *h = osd->od_brw_stats.hist;
219 atomic_inc(&iobuf->dr_numreqs);
221 if (iobuf->dr_rw == 0) {
222 atomic_inc(&osd->od_r_in_flight);
223 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
224 atomic_read(&osd->od_r_in_flight));
225 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
226 } else if (iobuf->dr_rw == 1) {
227 atomic_inc(&osd->od_w_in_flight);
228 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
229 atomic_read(&osd->od_w_in_flight));
230 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
236 static void osd_submit_bio(int rw, struct bio *bio)
238 LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
240 submit_bio(READ, bio);
242 submit_bio(WRITE, bio);
245 static int can_be_merged(struct bio *bio, sector_t sector)
252 size = bio->bi_size >> 9;
253 return bio->bi_sector + size == sector ? 1 : 0;
256 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
257 struct osd_iobuf *iobuf)
259 int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
260 struct page **pages = iobuf->dr_pages;
261 int npages = iobuf->dr_npages;
262 unsigned long *blocks = iobuf->dr_blocks;
263 int total_blocks = npages * blocks_per_page;
264 int sector_bits = inode->i_sb->s_blocksize_bits - 9;
265 unsigned int blocksize = inode->i_sb->s_blocksize;
266 struct bio *bio = NULL;
268 unsigned int page_offset;
277 LASSERT(iobuf->dr_npages == npages);
279 osd_brw_stats_update(osd, iobuf);
280 iobuf->dr_start_time = cfs_time_current();
282 for (page_idx = 0, block_idx = 0;
284 page_idx++, block_idx += blocks_per_page) {
286 page = pages[page_idx];
287 LASSERT(block_idx + blocks_per_page <= total_blocks);
289 for (i = 0, page_offset = 0;
291 i += nblocks, page_offset += blocksize * nblocks) {
295 if (blocks[block_idx + i] == 0) { /* hole */
296 LASSERTF(iobuf->dr_rw == 0,
297 "page_idx %u, block_idx %u, i %u\n",
298 page_idx, block_idx, i);
299 memset(kmap(page) + page_offset, 0, blocksize);
304 sector = (sector_t)blocks[block_idx + i] << sector_bits;
306 /* Additional contiguous file blocks? */
307 while (i + nblocks < blocks_per_page &&
308 (sector + (nblocks << sector_bits)) ==
309 ((sector_t)blocks[block_idx + i + nblocks] <<
314 can_be_merged(bio, sector) &&
315 bio_add_page(bio, page,
316 blocksize * nblocks, page_offset) != 0)
317 continue; /* added this frag OK */
320 struct request_queue *q =
321 bdev_get_queue(bio->bi_bdev);
323 /* Dang! I have to fragment this I/O */
324 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
325 "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
327 bio->bi_vcnt, bio->bi_max_vecs,
328 bio->bi_size >> 9, queue_max_sectors(q),
329 bio_phys_segments(q, bio),
330 queue_max_phys_segments(q),
331 0, queue_max_hw_segments(q));
333 record_start_io(iobuf, bio->bi_size);
334 osd_submit_bio(iobuf->dr_rw, bio);
337 /* allocate new bio */
338 bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
339 (npages - page_idx) *
342 CERROR("Can't allocate bio %u*%u = %u pages\n",
343 (npages - page_idx), blocks_per_page,
344 (npages - page_idx) * blocks_per_page);
349 bio->bi_bdev = inode->i_sb->s_bdev;
350 bio->bi_sector = sector;
351 bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
352 bio->bi_end_io = dio_complete_routine;
353 bio->bi_private = iobuf;
355 rc = bio_add_page(bio, page,
356 blocksize * nblocks, page_offset);
362 record_start_io(iobuf, bio->bi_size);
363 osd_submit_bio(iobuf->dr_rw, bio);
368 /* in order to achieve better IO throughput, we don't wait for writes
369 * completion here. instead we proceed with transaction commit in
370 * parallel and wait for IO completion once transaction is stopped
371 * see osd_trans_stop() for more details -bzzz */
372 if (iobuf->dr_rw == 0) {
373 wait_event(iobuf->dr_wait,
374 atomic_read(&iobuf->dr_numreqs) == 0);
375 osd_fini_iobuf(osd, iobuf);
379 rc = iobuf->dr_error;
383 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
384 struct niobuf_local *lnb)
391 int poff = offset & (PAGE_CACHE_SIZE - 1);
392 int plen = PAGE_CACHE_SIZE - poff;
396 lnb->lnb_file_offset = offset;
397 lnb->lnb_page_offset = poff;
399 /* lnb->lnb_flags = rnb->rnb_flags; */
401 lnb->lnb_page = NULL;
404 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
415 struct page *osd_get_page(struct dt_object *dt, loff_t offset, int rw)
417 struct inode *inode = osd_dt_obj(dt)->oo_inode;
418 struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
423 page = find_or_create_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
424 GFP_NOFS | __GFP_HIGHMEM);
425 if (unlikely(page == NULL))
426 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
432 * there are following "locks":
449 int osd_bufs_get(const struct lu_env *env, struct dt_object *d, loff_t pos,
450 ssize_t len, struct niobuf_local *lnb, int rw,
451 struct lustre_capa *capa)
453 struct osd_object *obj = osd_dt_obj(d);
454 int npages, i, rc = 0;
456 LASSERT(obj->oo_inode);
458 osd_map_remote_to_local(pos, len, &npages, lnb);
460 for (i = 0; i < npages; i++, lnb++) {
461 lnb->lnb_page = osd_get_page(d, lnb->lnb_file_offset, rw);
462 if (lnb->lnb_page == NULL)
463 GOTO(cleanup, rc = -ENOMEM);
465 /* DLM locking protects us from write and truncate competing
466 * for same region, but truncate can leave dirty page in the
467 * cache. it's possible the writeout on a such a page is in
468 * progress when we access it. it's also possible that during
469 * this writeout we put new (partial) data, but then won't
470 * be able to proceed in filter_commitrw_write(). thus let's
471 * just wait for writeout completion, should be rare enough.
473 wait_on_page_writeback(lnb->lnb_page);
474 BUG_ON(PageWriteback(lnb->lnb_page));
476 lu_object_get(&d->do_lu);
484 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
485 struct niobuf_local *lnb, int npages)
489 for (i = 0; i < npages; i++) {
490 if (lnb[i].lnb_page == NULL)
492 LASSERT(PageLocked(lnb[i].lnb_page));
493 unlock_page(lnb[i].lnb_page);
494 page_cache_release(lnb[i].lnb_page);
495 lu_object_put(env, &dt->do_lu);
496 lnb[i].lnb_page = NULL;
502 #ifndef HAVE_LDISKFS_MAP_BLOCKS
504 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
505 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
509 unsigned long *blocks;
516 static long ldiskfs_ext_find_goal(struct inode *inode,
517 struct ldiskfs_ext_path *path,
518 unsigned long block, int *aflags)
520 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
521 unsigned long bg_start;
522 unsigned long colour;
526 struct ldiskfs_extent *ex;
527 depth = path->p_depth;
529 /* try to predict block placement */
530 if ((ex = path[depth].p_ext))
531 return ldiskfs_ext_pblock(ex) +
532 (block - le32_to_cpu(ex->ee_block));
534 /* it looks index is empty
535 * try to find starting from index itself */
536 if (path[depth].p_bh)
537 return path[depth].p_bh->b_blocknr;
540 /* OK. use inode's group */
541 bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
542 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
543 colour = (current->pid % 16) *
544 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
545 return bg_start + colour + block;
548 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
549 struct ldiskfs_ext_path *path,
550 unsigned long block, unsigned long *count,
553 struct ldiskfs_allocation_request ar;
554 unsigned long pblock;
557 /* find neighbour allocated blocks */
559 *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
563 *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
567 /* allocate new block */
568 ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
572 ar.flags = LDISKFS_MB_HINT_DATA;
573 pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
578 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
579 struct ldiskfs_ext_path *path,
580 struct ldiskfs_ext_cache *cex,
581 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
582 struct ldiskfs_extent *ex,
586 struct bpointers *bp = cbdata;
587 struct ldiskfs_extent nex;
588 unsigned long pblock;
594 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
595 if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
597 if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
603 if (bp->create == 0) {
605 if (cex->ec_block < bp->start)
606 i = bp->start - cex->ec_block;
607 if (i >= cex->ec_len)
608 CERROR("nothing to do?! i = %d, e_num = %u\n",
610 for (; i < cex->ec_len && bp->num; i++) {
620 tgen = LDISKFS_I(inode)->i_ext_generation;
621 count = ldiskfs_ext_calc_credits_for_insert(inode, path);
623 handle = osd_journal_start(inode, LDISKFS_HT_MISC,
624 count + LDISKFS_ALLOC_NEEDED + 1);
625 if (IS_ERR(handle)) {
626 return PTR_ERR(handle);
629 if (tgen != LDISKFS_I(inode)->i_ext_generation) {
630 /* the tree has changed. so path can be invalid at moment */
631 ldiskfs_journal_stop(handle);
635 /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
636 * protected by i_data_sem as whole. so we patch it to store
637 * generation to path and now verify the tree hasn't changed */
638 down_write((&LDISKFS_I(inode)->i_data_sem));
640 /* validate extent, make sure the extent tree does not changed */
641 if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
642 /* cex is invalid, try again */
643 up_write(&LDISKFS_I(inode)->i_data_sem);
644 ldiskfs_journal_stop(handle);
649 pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
652 BUG_ON(count > cex->ec_len);
654 /* insert new extent */
655 nex.ee_block = cpu_to_le32(cex->ec_block);
656 ldiskfs_ext_store_pblock(&nex, pblock);
657 nex.ee_len = cpu_to_le16(count);
658 err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
660 /* free data blocks we just allocated */
661 /* not a good idea to call discard here directly,
662 * but otherwise we'd need to call it every free() */
663 ldiskfs_discard_preallocations(inode);
664 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
665 ldiskfs_free_blocks(handle, inode, NULL,
666 ldiskfs_ext_pblock(&nex),
667 le16_to_cpu(nex.ee_len), 0);
669 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
670 le16_to_cpu(nex.ee_len), 0);
676 * Putting len of the actual extent we just inserted,
677 * we are asking ldiskfs_ext_walk_space() to continue
678 * scaning after that block
680 cex->ec_len = le16_to_cpu(nex.ee_len);
681 cex->ec_start = ldiskfs_ext_pblock(&nex);
682 BUG_ON(le16_to_cpu(nex.ee_len) == 0);
683 BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
686 up_write((&LDISKFS_I(inode)->i_data_sem));
687 ldiskfs_journal_stop(handle);
692 CERROR("hmm. why do we find this extent?\n");
693 CERROR("initial space: %lu:%u\n",
694 bp->start, bp->init_num);
695 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
696 CERROR("current extent: %u/%u/%llu %d\n",
697 cex->ec_block, cex->ec_len,
698 (unsigned long long)cex->ec_start,
701 CERROR("current extent: %u/%u/%llu\n",
702 cex->ec_block, cex->ec_len,
703 (unsigned long long)cex->ec_start);
707 if (cex->ec_block < bp->start)
708 i = bp->start - cex->ec_block;
709 if (i >= cex->ec_len)
710 CERROR("nothing to do?! i = %d, e_num = %u\n",
712 for (; i < cex->ec_len && bp->num; i++) {
713 *(bp->blocks) = cex->ec_start + i;
714 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
715 if (cex->ec_type != LDISKFS_EXT_CACHE_EXTENT) {
717 if ((cex->ec_len == 0) || (cex->ec_start == 0)) {
719 /* unmap any possible underlying metadata from
720 * the block device mapping. bug 6998. */
721 unmap_underlying_metadata(inode->i_sb->s_bdev,
732 int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long block,
733 unsigned long num, unsigned long *blocks,
739 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
740 block, block + num - 1, (unsigned) inode->i_ino);
744 bp.init_num = bp.num = num;
747 err = ldiskfs_ext_walk_space(inode, block, num,
748 ldiskfs_ext_new_extent_cb, &bp);
749 ldiskfs_ext_invalidate_cache(inode);
754 int osd_ldiskfs_map_bm_inode_pages(struct inode *inode, struct page **page,
755 int pages, unsigned long *blocks,
758 int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
762 for (i = 0, b = blocks; i < pages; i++, page++) {
763 rc = ldiskfs_map_inode_page(inode, *page, b, create);
765 CERROR("ino %lu, blk %lu create %d: rc %d\n",
766 inode->i_ino, *b, create, rc);
769 b += blocks_per_page;
774 int osd_ldiskfs_map_ext_inode_pages(struct inode *inode, struct page **page,
775 int pages, unsigned long *blocks,
778 int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
780 struct page *fp = NULL;
783 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
784 inode->i_ino, pages, (*page)->index);
786 /* pages are sorted already. so, we just have to find
787 * contig. space and process them properly */
790 /* start new extent */
795 } else if (fp->index + clen == (*page)->index) {
796 /* continue the extent */
803 /* process found extent */
804 rc = osd_ldiskfs_map_nblocks(inode, fp->index * blocks_per_page,
805 clen * blocks_per_page, blocks,
810 /* look for next extent */
812 blocks += blocks_per_page * clen;
816 rc = osd_ldiskfs_map_nblocks(inode, fp->index * blocks_per_page,
817 clen * blocks_per_page, blocks,
823 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
824 int pages, unsigned long *blocks,
829 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
830 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
834 rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
839 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
840 int pages, unsigned long *blocks,
843 int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
845 struct page *fp = NULL;
848 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
849 inode->i_ino, pages, (*page)->index);
851 /* pages are sorted already. so, we just have to find
852 * contig. space and process them properly */
854 long blen, total = 0;
855 handle_t *handle = NULL;
856 struct ldiskfs_map_blocks map = { 0 };
858 if (fp == NULL) { /* start new extent */
863 } else if (fp->index + clen == (*page)->index) {
864 /* continue the extent */
870 /* process found extent */
871 map.m_lblk = fp->index * blocks_per_page;
872 map.m_len = blen = clen * blocks_per_page;
874 create = LDISKFS_GET_BLOCKS_CREATE;
875 handle = ldiskfs_journal_current_handle();
876 LASSERT(handle != NULL);
879 rc = ldiskfs_map_blocks(handle, inode, &map, create);
882 for (; total < blen && c < map.m_len; c++, total++) {
884 *(blocks + total) = 0;
888 *(blocks + total) = map.m_pblk + c;
889 /* unmap any possible underlying
890 * metadata from the block device
891 * mapping. bug 6998. */
892 if ((map.m_flags & LDISKFS_MAP_NEW) &&
894 unmap_underlying_metadata(
901 if (rc == 0 && total < blen) {
902 map.m_lblk = fp->index * blocks_per_page + total;
903 map.m_len = blen - total;
909 /* look for next extent */
911 blocks += blocks_per_page * clen;
916 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
918 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
919 struct niobuf_local *lnb, int npages)
921 struct osd_thread_info *oti = osd_oti_get(env);
922 struct osd_iobuf *iobuf = &oti->oti_iobuf;
923 struct inode *inode = osd_dt_obj(dt)->oo_inode;
924 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
925 struct timeval start;
927 unsigned long timediff;
936 rc = osd_init_iobuf(osd, iobuf, 0, npages);
937 if (unlikely(rc != 0))
940 isize = i_size_read(inode);
941 maxidx = ((isize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 1;
943 if (osd->od_writethrough_cache)
945 if (isize > osd->od_readcache_max_filesize)
948 do_gettimeofday(&start);
949 for (i = 0; i < npages; i++) {
952 generic_error_remove_page(inode->i_mapping,
956 * till commit the content of the page is undefined
957 * we'll set it uptodate once bulk is done. otherwise
958 * subsequent reads can access non-stable data
960 ClearPageUptodate(lnb[i].lnb_page);
962 if (lnb[i].lnb_len == PAGE_CACHE_SIZE)
965 if (maxidx >= lnb[i].lnb_page->index) {
966 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
969 char *p = kmap(lnb[i].lnb_page);
971 off = lnb[i].lnb_page_offset;
974 off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
977 memset(p + off, 0, PAGE_CACHE_SIZE - off);
978 kunmap(lnb[i].lnb_page);
981 do_gettimeofday(&end);
982 timediff = cfs_timeval_sub(&end, &start, NULL);
983 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
985 if (iobuf->dr_npages) {
986 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
988 iobuf->dr_blocks, 0);
989 if (likely(rc == 0)) {
990 rc = osd_do_bio(osd, inode, iobuf);
991 /* do IO stats for preparation reads */
992 osd_fini_iobuf(osd, iobuf);
998 /* Check if a block is allocated or not */
999 static int osd_is_mapped(struct inode *inode, obd_size offset)
1001 sector_t (*fs_bmap)(struct address_space *, sector_t);
1003 fs_bmap = inode->i_mapping->a_ops->bmap;
1005 /* We can't know if we are overwriting or not */
1006 if (unlikely(fs_bmap == NULL))
1009 if (i_size_read(inode) == 0)
1012 /* Beyond EOF, must not be mapped */
1013 if (((i_size_read(inode) - 1) >> inode->i_blkbits) <
1014 (offset >> inode->i_blkbits))
1017 if (fs_bmap(inode->i_mapping, offset >> inode->i_blkbits) == 0)
1023 static int osd_declare_write_commit(const struct lu_env *env,
1024 struct dt_object *dt,
1025 struct niobuf_local *lnb, int npages,
1026 struct thandle *handle)
1028 const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1029 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1030 struct osd_thandle *oh;
1037 bool ignore_quota = false;
1038 long long quota_space = 0;
1041 LASSERT(handle != NULL);
1042 oh = container_of0(handle, struct osd_thandle, ot_super);
1043 LASSERT(oh->ot_handle == NULL);
1047 /* calculate number of extents (probably better to pass nb) */
1048 for (i = 0; i < npages; i++) {
1049 if (i && lnb[i].lnb_file_offset !=
1050 lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1053 if (!osd_is_mapped(inode, lnb[i].lnb_file_offset))
1054 quota_space += PAGE_CACHE_SIZE;
1056 /* ignore quota for the whole request if any page is from
1057 * client cache or written by root.
1059 * XXX once we drop the 1.8 client support, the checking
1060 * for whether page is from cache can be simplified as:
1061 * !(lnb[i].flags & OBD_BRW_SYNC)
1063 * XXX we could handle this on per-lnb basis as done by
1065 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1066 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1068 ignore_quota = true;
1072 * each extent can go into new leaf causing a split
1073 * 5 is max tree depth: inode + 4 index blocks
1074 * with blockmaps, depth is 3 at most
1076 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1078 * many concurrent threads may grow tree by the time
1079 * our transaction starts. so, consider 2 is a min depth
1081 depth = ext_depth(inode);
1082 depth = max(depth, 1) + 1;
1084 oh->ot_credits++; /* inode */
1085 oh->ot_credits += depth * 2 * extents;
1089 oh->ot_credits++; /* inode */
1090 oh->ot_credits += depth * extents;
1093 /* quota space for metadata blocks */
1094 quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1096 /* quota space should be reported in 1K blocks */
1097 quota_space = toqb(quota_space);
1099 /* each new block can go in different group (bitmap + gd) */
1101 /* we can't dirty more bitmap blocks than exist */
1102 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1103 oh->ot_credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1105 oh->ot_credits += newblocks;
1107 /* we can't dirty more gd blocks than exist */
1108 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1109 oh->ot_credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1111 oh->ot_credits += newblocks;
1113 /* make sure the over quota flags were not set */
1114 lnb[0].lnb_flags &= ~(OBD_BRW_OVER_USRQUOTA | OBD_BRW_OVER_GRPQUOTA);
1116 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1117 quota_space, oh, true, true, &flags,
1120 /* we need only to store the overquota flags in the first lnb for
1121 * now, once we support multiple objects BRW, this code needs be
1123 if (flags & QUOTA_FL_OVER_USRQUOTA)
1124 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1125 if (flags & QUOTA_FL_OVER_GRPQUOTA)
1126 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1131 /* Check if a block is allocated or not */
1132 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1133 struct niobuf_local *lnb, int npages,
1134 struct thandle *thandle)
1136 struct osd_thread_info *oti = osd_oti_get(env);
1137 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1138 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1139 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1145 rc = osd_init_iobuf(osd, iobuf, 1, npages);
1146 if (unlikely(rc != 0))
1149 isize = i_size_read(inode);
1150 ll_vfs_dq_init(inode);
1152 for (i = 0; i < npages; i++) {
1153 if (lnb[i].lnb_rc == -ENOSPC &&
1154 osd_is_mapped(inode, lnb[i].lnb_file_offset)) {
1155 /* Allow the write to proceed if overwriting an
1160 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1161 CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1163 LASSERT(lnb[i].lnb_page);
1164 generic_error_remove_page(inode->i_mapping,
1169 LASSERT(PageLocked(lnb[i].lnb_page));
1170 LASSERT(!PageWriteback(lnb[i].lnb_page));
1172 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1173 isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1176 * Since write and truncate are serialized by oo_sem, even
1177 * partial-page truncate should not leave dirty pages in the
1180 LASSERT(!PageDirty(lnb[i].lnb_page));
1182 SetPageUptodate(lnb[i].lnb_page);
1184 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1187 if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1189 } else if (iobuf->dr_npages > 0) {
1190 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1192 iobuf->dr_blocks, 1);
1194 /* no pages to write, no transno is needed */
1195 thandle->th_local = 1;
1198 if (likely(rc == 0)) {
1199 if (isize > i_size_read(inode)) {
1200 i_size_write(inode, isize);
1201 LDISKFS_I(inode)->i_disksize = isize;
1202 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1205 rc = osd_do_bio(osd, inode, iobuf);
1206 /* we don't do stats here as in read path because
1207 * write is async: we'll do this in osd_put_bufs() */
1209 osd_fini_iobuf(osd, iobuf);
1212 if (unlikely(rc != 0)) {
1213 /* if write fails, we should drop pages from the cache */
1214 for (i = 0; i < npages; i++) {
1215 if (lnb[i].lnb_page == NULL)
1217 LASSERT(PageLocked(lnb[i].lnb_page));
1218 generic_error_remove_page(inode->i_mapping,
1226 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1227 struct niobuf_local *lnb, int npages)
1229 struct osd_thread_info *oti = osd_oti_get(env);
1230 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1231 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1232 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1233 struct timeval start, end;
1234 unsigned long timediff;
1235 int rc = 0, i, m = 0, cache = 0, cache_hits = 0, cache_misses = 0;
1239 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1240 if (unlikely(rc != 0))
1243 if (osd->od_read_cache)
1245 if (i_size_read(inode) > osd->od_readcache_max_filesize)
1248 do_gettimeofday(&start);
1249 for (i = 0; i < npages; i++) {
1251 if (i_size_read(inode) <= lnb[i].lnb_file_offset)
1252 /* If there's no more data, abort early.
1253 * lnb->lnb_rc == 0, so it's easy to detect later. */
1256 if (i_size_read(inode) <
1257 lnb[i].lnb_file_offset + lnb[i].lnb_len - 1)
1258 lnb[i].lnb_rc = i_size_read(inode) -
1259 lnb[i].lnb_file_offset;
1261 lnb[i].lnb_rc = lnb[i].lnb_len;
1262 m += lnb[i].lnb_len;
1264 if (PageUptodate(lnb[i].lnb_page)) {
1268 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1272 generic_error_remove_page(inode->i_mapping,
1275 do_gettimeofday(&end);
1276 timediff = cfs_timeval_sub(&end, &start, NULL);
1277 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1279 if (cache_hits != 0)
1280 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1282 if (cache_misses != 0)
1283 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1285 if (cache_hits + cache_misses != 0)
1286 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1287 cache_hits + cache_misses);
1289 if (iobuf->dr_npages) {
1290 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1292 iobuf->dr_blocks, 0);
1293 rc = osd_do_bio(osd, inode, iobuf);
1295 /* IO stats will be done in osd_bufs_put() */
1302 * XXX: Another layering violation for now.
1304 * We don't want to use ->f_op->read methods, because generic file write
1306 * - serializes on ->i_sem, and
1308 * - does a lot of extra work like balance_dirty_pages(),
1310 * which doesn't work for globally shared files like /last_rcvd.
1312 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1314 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1316 memcpy(buffer, (char *)ei->i_data, buflen);
1321 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1323 struct buffer_head *bh;
1324 unsigned long block;
1331 /* prevent reading after eof */
1332 spin_lock(&inode->i_lock);
1333 if (i_size_read(inode) < *offs + size) {
1334 loff_t diff = i_size_read(inode) - *offs;
1335 spin_unlock(&inode->i_lock);
1337 CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1338 i_size_read(inode), *offs);
1340 } else if (diff == 0) {
1346 spin_unlock(&inode->i_lock);
1349 blocksize = 1 << inode->i_blkbits;
1352 block = *offs >> inode->i_blkbits;
1353 boffs = *offs & (blocksize - 1);
1354 csize = min(blocksize - boffs, size);
1355 bh = ldiskfs_bread(NULL, inode, block, 0, &err);
1357 CERROR("%s: can't read %u@%llu on ino %lu: rc = %d\n",
1358 LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
1359 csize, *offs, inode->i_ino, err);
1363 memcpy(buf, bh->b_data + boffs, csize);
1373 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1374 struct lu_buf *buf, loff_t *pos,
1375 struct lustre_capa *capa)
1377 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1380 if (osd_object_auth(env, dt, capa, CAPA_OPC_BODY_READ))
1383 /* Read small symlink from inode body as we need to maintain correct
1384 * on-disk symlinks for ldiskfs.
1386 if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1387 (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1388 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1390 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1395 static inline int osd_extents_enabled(struct super_block *sb,
1396 struct inode *inode)
1398 if (inode != NULL) {
1399 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1401 } else if (test_opt(sb, EXTENTS)) {
1407 static inline int osd_calc_bkmap_credits(struct super_block *sb,
1408 struct inode *inode,
1413 int credits, bits, bs, i;
1415 bits = sb->s_blocksize_bits;
1418 /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1419 * we do not expect blockmaps on the large files,
1420 * so let's shrink it to 2 levels (4GB files) */
1422 /* this is default reservation: 2 levels */
1423 credits = (blocks + 2) * 3;
1425 /* actual offset is unknown, hard to optimize */
1429 /* now check for few specific cases to optimize */
1430 if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1433 /* allocate if not allocated */
1434 if (inode == NULL) {
1435 credits += blocks * 2;
1438 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1439 LASSERT(i < LDISKFS_NDIR_BLOCKS);
1440 if (LDISKFS_I(inode)->i_data[i] == 0)
1443 } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1444 /* single indirect */
1445 credits = blocks * 3;
1446 /* probably indirect block has been allocated already */
1447 if (!inode || LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK])
1454 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1455 const struct lu_buf *buf, loff_t _pos,
1456 struct thandle *handle)
1458 struct osd_object *obj = osd_dt_obj(dt);
1459 struct inode *inode = obj->oo_inode;
1460 struct super_block *sb = osd_sb(osd_obj2dev(obj));
1461 struct osd_thandle *oh;
1462 int rc = 0, est = 0, credits, blocks, allocated = 0;
1468 LASSERT(buf != NULL);
1469 LASSERT(handle != NULL);
1471 oh = container_of0(handle, struct osd_thandle, ot_super);
1472 LASSERT(oh->ot_handle == NULL);
1475 bits = sb->s_blocksize_bits;
1479 /* if this is an append, then we
1480 * should expect cross-block record */
1486 /* blocks to modify */
1487 blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1488 LASSERT(blocks > 0);
1490 if (inode != NULL && _pos != -1) {
1491 /* object size in blocks */
1492 est = (i_size_read(inode) + bs - 1) >> bits;
1493 allocated = inode->i_blocks >> (bits - 9);
1494 if (pos + size <= i_size_read(inode) && est <= allocated) {
1495 /* looks like an overwrite, no need to modify tree */
1497 /* no need to modify i_size */
1502 if (osd_extents_enabled(sb, inode)) {
1504 * many concurrent threads may grow tree by the time
1505 * our transaction starts. so, consider 2 is a min depth
1506 * for every level we may need to allocate a new block
1507 * and take some entries from the old one. so, 3 blocks
1508 * to allocate (bitmap, gd, itself) + old block - 4 per
1511 depth = inode != NULL ? ext_depth(inode) : 0;
1512 depth = max(depth, 1) + 1;
1514 /* if not append, then split may need to modify
1515 * existing blocks moving entries into the new ones */
1518 /* blocks to store data: bitmap,gd,itself */
1519 credits += blocks * 3;
1521 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1523 /* if inode is created as part of the transaction,
1524 * then it's counted already by the creation method */
1530 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1532 /* dt_declare_write() is usually called for system objects, such
1533 * as llog or last_rcvd files. We needn't enforce quota on those
1534 * objects, so always set the lqi_space as 0. */
1536 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1537 i_gid_read(inode), 0, oh, true,
1542 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1544 /* LU-2634: clear the extent format for fast symlink */
1545 ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1547 memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1548 LDISKFS_I(inode)->i_disksize = buflen;
1549 i_size_write(inode, buflen);
1550 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1555 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1556 int write_NUL, loff_t *offs, handle_t *handle)
1558 struct buffer_head *bh = NULL;
1559 loff_t offset = *offs;
1560 loff_t new_size = i_size_read(inode);
1561 unsigned long block;
1562 int blocksize = 1 << inode->i_blkbits;
1566 int dirty_inode = 0;
1570 * long symlink write does not count the NUL terminator in
1571 * bufsize, we write it, and the inode's file size does not
1572 * count the NUL terminator as well.
1574 ((char *)buf)[bufsize] = '\0';
1577 while (bufsize > 0) {
1581 block = offset >> inode->i_blkbits;
1582 boffs = offset & (blocksize - 1);
1583 size = min(blocksize - boffs, bufsize);
1584 bh = ldiskfs_bread(handle, inode, block, 1, &err);
1586 CERROR("%s: error reading offset %llu (block %lu): "
1588 inode->i_sb->s_id, offset, block, err);
1592 err = ldiskfs_journal_get_write_access(handle, bh);
1594 CERROR("journal_get_write_access() returned error %d\n",
1598 LASSERTF(boffs + size <= bh->b_size,
1599 "boffs %d size %d bh->b_size %lu\n",
1600 boffs, size, (unsigned long)bh->b_size);
1601 memcpy(bh->b_data + boffs, buf, size);
1602 err = ldiskfs_journal_dirty_metadata(handle, bh);
1606 if (offset + size > new_size)
1607 new_size = offset + size;
1617 /* correct in-core and on-disk sizes */
1618 if (new_size > i_size_read(inode)) {
1619 spin_lock(&inode->i_lock);
1620 if (new_size > i_size_read(inode))
1621 i_size_write(inode, new_size);
1622 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1623 LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1626 spin_unlock(&inode->i_lock);
1628 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1636 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1637 const struct lu_buf *buf, loff_t *pos,
1638 struct thandle *handle, struct lustre_capa *capa,
1641 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1642 struct osd_thandle *oh;
1646 LASSERT(dt_object_exists(dt));
1648 if (osd_object_auth(env, dt, capa, CAPA_OPC_BODY_WRITE))
1651 LASSERT(handle != NULL);
1652 LASSERT(inode != NULL);
1653 ll_vfs_dq_init(inode);
1655 /* XXX: don't check: one declared chunk can be used many times */
1656 /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1658 oh = container_of(handle, struct osd_thandle, ot_super);
1659 LASSERT(oh->ot_handle->h_transaction != NULL);
1660 /* Write small symlink to inode body as we need to maintain correct
1661 * on-disk symlinks for ldiskfs.
1662 * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1663 * does not count it in.
1665 is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1666 if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1667 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1669 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1670 buf->lb_len, is_link, pos,
1673 result = buf->lb_len;
1677 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1678 __u64 start, __u64 end, struct thandle *th)
1680 struct osd_thandle *oh;
1681 struct inode *inode;
1686 oh = container_of(th, struct osd_thandle, ot_super);
1689 * we don't need to reserve credits for whole truncate
1690 * it's not possible as truncate may need to free too many
1691 * blocks and that won't fit a single transaction. instead
1692 * we reserve credits to change i_size and put inode onto
1693 * orphan list. if needed truncate will extend or restart
1696 osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1697 osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1699 inode = osd_dt_obj(dt)->oo_inode;
1702 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1703 0, oh, true, true, NULL, false);
1707 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1708 __u64 start, __u64 end, struct thandle *th,
1709 struct lustre_capa *capa)
1711 struct osd_thandle *oh;
1712 struct osd_object *obj = osd_dt_obj(dt);
1713 struct inode *inode = obj->oo_inode;
1716 int rc = 0, rc2 = 0;
1719 LASSERT(end == OBD_OBJECT_EOF);
1720 LASSERT(dt_object_exists(dt));
1721 LASSERT(osd_invariant(obj));
1722 LASSERT(inode != NULL);
1723 ll_vfs_dq_init(inode);
1726 oh = container_of(th, struct osd_thandle, ot_super);
1727 LASSERT(oh->ot_handle->h_transaction != NULL);
1729 osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1731 tid = oh->ot_handle->h_transaction->t_tid;
1733 i_size_write(inode, start);
1734 ll_truncate_pagecache(inode, start);
1735 #ifdef HAVE_INODEOPS_TRUNCATE
1736 if (inode->i_op->truncate) {
1737 inode->i_op->truncate(inode);
1740 ldiskfs_truncate(inode);
1743 * For a partial-page truncate, flush the page to disk immediately to
1744 * avoid data corruption during direct disk write. b=17397
1746 if ((start & ~CFS_PAGE_MASK) != 0)
1747 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1749 h = journal_current_handle();
1751 LASSERT(h == oh->ot_handle);
1753 if (tid != h->h_transaction->t_tid) {
1754 int credits = oh->ot_credits;
1756 * transaction has changed during truncate
1757 * we need to restart the handle with our credits
1759 if (h->h_buffer_credits < credits) {
1760 if (ldiskfs_journal_extend(h, credits))
1761 rc2 = ldiskfs_journal_restart(h, credits);
1765 RETURN(rc == 0 ? rc2 : rc);
1768 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1769 struct ll_user_fiemap *fm)
1771 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1772 struct osd_thread_info *info = osd_oti_get(env);
1773 struct dentry *dentry = &info->oti_obj_dentry;
1774 struct file *file = &info->oti_file;
1775 mm_segment_t saved_fs;
1779 dentry->d_inode = inode;
1780 dentry->d_sb = inode->i_sb;
1781 file->f_dentry = dentry;
1782 file->f_mapping = inode->i_mapping;
1783 file->f_op = inode->i_fop;
1784 set_file_inode(file, inode);
1786 saved_fs = get_fs();
1788 /* ldiskfs_ioctl does not have a inode argument */
1789 if (inode->i_fop->unlocked_ioctl)
1790 rc = inode->i_fop->unlocked_ioctl(file, FSFILT_IOC_FIEMAP,
1799 * in some cases we may need declare methods for objects being created
1800 * e.g., when we create symlink
1802 const struct dt_body_operations osd_body_ops_new = {
1803 .dbo_declare_write = osd_declare_write,
1806 const struct dt_body_operations osd_body_ops = {
1807 .dbo_read = osd_read,
1808 .dbo_declare_write = osd_declare_write,
1809 .dbo_write = osd_write,
1810 .dbo_bufs_get = osd_bufs_get,
1811 .dbo_bufs_put = osd_bufs_put,
1812 .dbo_write_prep = osd_write_prep,
1813 .dbo_declare_write_commit = osd_declare_write_commit,
1814 .dbo_write_commit = osd_write_commit,
1815 .dbo_read_prep = osd_read_prep,
1816 .dbo_declare_punch = osd_declare_punch,
1817 .dbo_punch = osd_punch,
1818 .dbo_fiemap_get = osd_fiemap_get,