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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Author: Nikita Danilov <nikita@clusterfs.com>
37 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
41 /* prerequisite for linux/xattr.h */
42 #include <linux/types.h>
43 /* prerequisite for linux/xattr.h */
46 #include <linux/pagevec.h>
49 * struct OBD_{ALLOC,FREE}*()
52 #include <obd_support.h>
54 #include "osd_internal.h"
57 #include <ldiskfs/ldiskfs_extents.h>
59 static int __osd_init_iobuf(struct osd_device *d, struct osd_iobuf *iobuf,
60 int rw, int line, int pages)
64 LASSERTF(iobuf->dr_elapsed_valid == 0,
65 "iobuf %p, reqs %d, rw %d, line %d\n", iobuf,
66 atomic_read(&iobuf->dr_numreqs), iobuf->dr_rw,
68 LASSERT(pages <= PTLRPC_MAX_BRW_PAGES);
70 init_waitqueue_head(&iobuf->dr_wait);
71 atomic_set(&iobuf->dr_numreqs, 0);
76 iobuf->dr_elapsed = ktime_set(0, 0);
77 /* must be counted before, so assert */
79 iobuf->dr_init_at = line;
81 blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
82 if (iobuf->dr_bl_buf.lb_len >= blocks * sizeof(iobuf->dr_blocks[0])) {
83 LASSERT(iobuf->dr_pg_buf.lb_len >=
84 pages * sizeof(iobuf->dr_pages[0]));
88 /* start with 1MB for 4K blocks */
90 while (i <= PTLRPC_MAX_BRW_PAGES && i < pages)
93 CDEBUG(D_OTHER, "realloc %u for %u (%u) pages\n",
94 (unsigned)(pages * sizeof(iobuf->dr_pages[0])), i, pages);
96 blocks = pages * (PAGE_SIZE >> osd_sb(d)->s_blocksize_bits);
97 iobuf->dr_max_pages = 0;
98 CDEBUG(D_OTHER, "realloc %u for %u blocks\n",
99 (unsigned)(blocks * sizeof(iobuf->dr_blocks[0])), blocks);
101 lu_buf_realloc(&iobuf->dr_bl_buf, blocks * sizeof(iobuf->dr_blocks[0]));
102 iobuf->dr_blocks = iobuf->dr_bl_buf.lb_buf;
103 if (unlikely(iobuf->dr_blocks == NULL))
106 lu_buf_realloc(&iobuf->dr_pg_buf, pages * sizeof(iobuf->dr_pages[0]));
107 iobuf->dr_pages = iobuf->dr_pg_buf.lb_buf;
108 if (unlikely(iobuf->dr_pages == NULL))
111 iobuf->dr_max_pages = pages;
115 #define osd_init_iobuf(dev, iobuf, rw, pages) \
116 __osd_init_iobuf(dev, iobuf, rw, __LINE__, pages)
118 static void osd_iobuf_add_page(struct osd_iobuf *iobuf, struct page *page)
120 LASSERT(iobuf->dr_npages < iobuf->dr_max_pages);
121 iobuf->dr_pages[iobuf->dr_npages++] = page;
124 void osd_fini_iobuf(struct osd_device *d, struct osd_iobuf *iobuf)
126 int rw = iobuf->dr_rw;
128 if (iobuf->dr_elapsed_valid) {
129 iobuf->dr_elapsed_valid = 0;
130 LASSERT(iobuf->dr_dev == d);
131 LASSERT(iobuf->dr_frags > 0);
132 lprocfs_oh_tally(&d->od_brw_stats.
133 hist[BRW_R_DIO_FRAGS+rw],
135 lprocfs_oh_tally_log2(&d->od_brw_stats.hist[BRW_R_IO_TIME+rw],
136 ktime_to_ms(iobuf->dr_elapsed));
140 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
141 static void dio_complete_routine(struct bio *bio)
143 # ifdef HAVE_BI_STATUS
144 int error = bio->bi_status;
146 int error = bio->bi_error;
149 static void dio_complete_routine(struct bio *bio, int error)
152 struct osd_iobuf *iobuf = bio->bi_private;
156 /* CAVEAT EMPTOR: possibly in IRQ context
157 * DO NOT record procfs stats here!!! */
159 if (unlikely(iobuf == NULL)) {
160 CERROR("***** bio->bi_private is NULL! This should never "
161 "happen. Normally, I would crash here, but instead I "
162 "will dump the bio contents to the console. Please "
163 "report this to <https://jira.whamcloud.com/> , along "
164 "with any interesting messages leading up to this point "
165 "(like SCSI errors, perhaps). Because bi_private is "
166 "NULL, I can't wake up the thread that initiated this "
167 "IO - you will probably have to reboot this node.\n");
168 CERROR("bi_next: %p, bi_flags: %lx, "
174 "bi_vcnt: %d, bi_idx: %d, bi->size: %d, bi_end_io: %p,"
175 "bi_cnt: %d, bi_private: %p\n", bio->bi_next,
176 (unsigned long)bio->bi_flags,
182 bio->bi_vcnt, bio_idx(bio),
183 bio_sectors(bio) << 9, bio->bi_end_io,
185 atomic_read(&bio->bi_cnt),
187 atomic_read(&bio->__bi_cnt),
193 /* the check is outside of the cycle for performance reason -bzzz */
194 if (!bio_data_dir(bio)) {
195 bio_for_each_segment_all(bvl, bio, iter) {
196 if (likely(error == 0))
197 SetPageUptodate(bvl_to_page(bvl));
198 LASSERT(PageLocked(bvl_to_page(bvl)));
200 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
202 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
205 /* any real error is good enough -bzzz */
206 if (error != 0 && iobuf->dr_error == 0)
207 iobuf->dr_error = error;
210 * set dr_elapsed before dr_numreqs turns to 0, otherwise
211 * it's possible that service thread will see dr_numreqs
212 * is zero, but dr_elapsed is not set yet, leading to lost
213 * data in this processing and an assertion in a subsequent
216 if (atomic_read(&iobuf->dr_numreqs) == 1) {
217 ktime_t now = ktime_get();
219 iobuf->dr_elapsed = ktime_sub(now, iobuf->dr_start_time);
220 iobuf->dr_elapsed_valid = 1;
222 if (atomic_dec_and_test(&iobuf->dr_numreqs))
223 wake_up(&iobuf->dr_wait);
225 /* Completed bios used to be chained off iobuf->dr_bios and freed in
226 * filter_clear_dreq(). It was then possible to exhaust the biovec-256
227 * mempool when serious on-disk fragmentation was encountered,
228 * deadlocking the OST. The bios are now released as soon as complete
229 * so the pool cannot be exhausted while IOs are competing. bug 10076 */
233 static void record_start_io(struct osd_iobuf *iobuf, int size)
235 struct osd_device *osd = iobuf->dr_dev;
236 struct obd_histogram *h = osd->od_brw_stats.hist;
239 atomic_inc(&iobuf->dr_numreqs);
241 if (iobuf->dr_rw == 0) {
242 atomic_inc(&osd->od_r_in_flight);
243 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
244 atomic_read(&osd->od_r_in_flight));
245 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
246 } else if (iobuf->dr_rw == 1) {
247 atomic_inc(&osd->od_w_in_flight);
248 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
249 atomic_read(&osd->od_w_in_flight));
250 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
256 static void osd_submit_bio(int rw, struct bio *bio)
258 LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
259 #ifdef HAVE_SUBMIT_BIO_2ARGS
261 submit_bio(READ, bio);
263 submit_bio(WRITE, bio);
270 static int can_be_merged(struct bio *bio, sector_t sector)
275 return bio_end_sector(bio) == sector ? 1 : 0;
279 * This function will change the data written, thus it should only be
280 * used when checking data integrity feature
282 static void bio_integrity_fault_inject(struct bio *bio)
284 struct bio_vec *bvec;
289 bio_for_each_segment_all(bvec, bio, i) {
290 struct page *page = bvec->bv_page;
300 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
301 struct osd_iobuf *iobuf)
303 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
304 struct page **pages = iobuf->dr_pages;
305 int npages = iobuf->dr_npages;
306 sector_t *blocks = iobuf->dr_blocks;
307 int total_blocks = npages * blocks_per_page;
308 int sector_bits = inode->i_sb->s_blocksize_bits - 9;
309 unsigned int blocksize = inode->i_sb->s_blocksize;
310 struct bio *bio = NULL;
312 unsigned int page_offset;
323 fault_inject = OBD_FAIL_CHECK(OBD_FAIL_OST_INTEGRITY_FAULT);
324 LASSERT(iobuf->dr_npages == npages);
326 osd_brw_stats_update(osd, iobuf);
327 iobuf->dr_start_time = ktime_get();
329 blk_start_plug(&plug);
330 for (page_idx = 0, block_idx = 0;
332 page_idx++, block_idx += blocks_per_page) {
334 page = pages[page_idx];
335 LASSERT(block_idx + blocks_per_page <= total_blocks);
337 for (i = 0, page_offset = 0;
339 i += nblocks, page_offset += blocksize * nblocks) {
343 if (blocks[block_idx + i] == 0) { /* hole */
344 LASSERTF(iobuf->dr_rw == 0,
345 "page_idx %u, block_idx %u, i %u\n",
346 page_idx, block_idx, i);
347 memset(kmap(page) + page_offset, 0, blocksize);
352 sector = (sector_t)blocks[block_idx + i] << sector_bits;
354 /* Additional contiguous file blocks? */
355 while (i + nblocks < blocks_per_page &&
356 (sector + (nblocks << sector_bits)) ==
357 ((sector_t)blocks[block_idx + i + nblocks] <<
362 can_be_merged(bio, sector) &&
363 bio_add_page(bio, page,
364 blocksize * nblocks, page_offset) != 0)
365 continue; /* added this frag OK */
368 struct request_queue *q = bio_get_queue(bio);
369 unsigned int bi_size = bio_sectors(bio) << 9;
371 /* Dang! I have to fragment this I/O */
372 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
373 "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
374 bi_size, bio->bi_vcnt, bio->bi_max_vecs,
376 queue_max_sectors(q),
377 bio_phys_segments(q, bio),
378 queue_max_phys_segments(q),
379 0, queue_max_hw_segments(q));
380 if (bio_integrity_enabled(bio)) {
381 if (bio_integrity_prep(bio)) {
386 if (unlikely(fault_inject))
387 bio_integrity_fault_inject(bio);
390 record_start_io(iobuf, bi_size);
391 osd_submit_bio(iobuf->dr_rw, bio);
394 /* allocate new bio */
395 bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
396 (npages - page_idx) *
399 CERROR("Can't allocate bio %u*%u = %u pages\n",
400 (npages - page_idx), blocks_per_page,
401 (npages - page_idx) * blocks_per_page);
406 bio_set_dev(bio, inode->i_sb->s_bdev);
407 bio_set_sector(bio, sector);
409 bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
411 bio->bi_opf = (iobuf->dr_rw == 0) ? READ : WRITE;
413 bio->bi_end_io = dio_complete_routine;
414 bio->bi_private = iobuf;
416 rc = bio_add_page(bio, page,
417 blocksize * nblocks, page_offset);
423 if (bio_integrity_enabled(bio)) {
424 if (bio_integrity_prep(bio)) {
429 if (unlikely(fault_inject))
430 bio_integrity_fault_inject(bio);
433 record_start_io(iobuf, bio_sectors(bio) << 9);
434 osd_submit_bio(iobuf->dr_rw, bio);
439 blk_finish_plug(&plug);
441 /* in order to achieve better IO throughput, we don't wait for writes
442 * completion here. instead we proceed with transaction commit in
443 * parallel and wait for IO completion once transaction is stopped
444 * see osd_trans_stop() for more details -bzzz */
445 if (iobuf->dr_rw == 0 || fault_inject) {
446 wait_event(iobuf->dr_wait,
447 atomic_read(&iobuf->dr_numreqs) == 0);
448 osd_fini_iobuf(osd, iobuf);
452 rc = iobuf->dr_error;
456 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
457 struct niobuf_local *lnb)
464 int poff = offset & (PAGE_SIZE - 1);
465 int plen = PAGE_SIZE - poff;
469 lnb->lnb_file_offset = offset;
470 lnb->lnb_page_offset = poff;
472 /* lnb->lnb_flags = rnb->rnb_flags; */
474 lnb->lnb_page = NULL;
477 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
488 static struct page *osd_get_page(struct dt_object *dt, loff_t offset,
491 struct inode *inode = osd_dt_obj(dt)->oo_inode;
492 struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
497 page = find_or_create_page(inode->i_mapping, offset >> PAGE_SHIFT,
500 if (unlikely(page == NULL))
501 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
507 * there are following "locks":
518 * - lock pages, unlock
520 * - lock partial page
526 * Unlock and release pages loaded by osd_bufs_get()
528 * Unlock \a npages pages from \a lnb and drop the refcount on them.
530 * \param env thread execution environment
531 * \param dt dt object undergoing IO (OSD object + methods)
532 * \param lnb array of pages undergoing IO
533 * \param npages number of pages in \a lnb
537 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
538 struct niobuf_local *lnb, int npages)
543 #ifdef HAVE_PAGEVEC_INIT_ONE_PARAM
546 pagevec_init(&pvec, 0);
549 for (i = 0; i < npages; i++) {
550 if (lnb[i].lnb_page == NULL)
552 LASSERT(PageLocked(lnb[i].lnb_page));
553 unlock_page(lnb[i].lnb_page);
554 if (pagevec_add(&pvec, lnb[i].lnb_page) == 0)
555 pagevec_release(&pvec);
556 dt_object_put(env, dt);
557 lnb[i].lnb_page = NULL;
560 /* Release any partial pagevec */
561 pagevec_release(&pvec);
567 * Load and lock pages undergoing IO
569 * Pages as described in the \a lnb array are fetched (from disk or cache)
570 * and locked for IO by the caller.
572 * DLM locking protects us from write and truncate competing for same region,
573 * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
574 * It's possible the writeout on a such a page is in progress when we access
575 * it. It's also possible that during this writeout we put new (partial) data
576 * into the page, but won't be able to proceed in filter_commitrw_write().
577 * Therefore, just wait for writeout completion as it should be rare enough.
579 * \param env thread execution environment
580 * \param dt dt object undergoing IO (OSD object + methods)
581 * \param pos byte offset of IO start
582 * \param len number of bytes of IO
583 * \param lnb array of extents undergoing IO
584 * \param rw read or write operation, and other flags
585 * \param capa capabilities
587 * \retval pages (zero or more) loaded successfully
588 * \retval -ENOMEM on memory/page allocation error
590 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
591 loff_t pos, ssize_t len, struct niobuf_local *lnb,
592 enum dt_bufs_type rw)
594 struct osd_object *obj = osd_dt_obj(dt);
595 int npages, i, rc = 0;
598 LASSERT(obj->oo_inode);
600 osd_map_remote_to_local(pos, len, &npages, lnb);
602 /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */
603 gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) :
605 for (i = 0; i < npages; i++, lnb++) {
606 lnb->lnb_page = osd_get_page(dt, lnb->lnb_file_offset,
608 if (lnb->lnb_page == NULL)
609 GOTO(cleanup, rc = -ENOMEM);
611 wait_on_page_writeback(lnb->lnb_page);
612 BUG_ON(PageWriteback(lnb->lnb_page));
614 lu_object_get(&dt->do_lu);
621 osd_bufs_put(env, dt, lnb - i, i);
625 #ifndef HAVE_LDISKFS_MAP_BLOCKS
627 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
628 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
639 static long ldiskfs_ext_find_goal(struct inode *inode,
640 struct ldiskfs_ext_path *path,
641 unsigned long block, int *aflags)
643 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
644 unsigned long bg_start;
645 unsigned long colour;
649 struct ldiskfs_extent *ex;
650 depth = path->p_depth;
652 /* try to predict block placement */
653 if ((ex = path[depth].p_ext))
654 return ldiskfs_ext_pblock(ex) +
655 (block - le32_to_cpu(ex->ee_block));
657 /* it looks index is empty
658 * try to find starting from index itself */
659 if (path[depth].p_bh)
660 return path[depth].p_bh->b_blocknr;
663 /* OK. use inode's group */
664 bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
665 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
666 colour = (current->pid % 16) *
667 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
668 return bg_start + colour + block;
671 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
672 struct ldiskfs_ext_path *path,
673 unsigned long block, unsigned long *count,
676 struct ldiskfs_allocation_request ar;
677 unsigned long pblock;
680 /* find neighbour allocated blocks */
682 *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
686 *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
690 /* allocate new block */
691 ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
695 ar.flags = LDISKFS_MB_HINT_DATA;
696 pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
701 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
702 struct ldiskfs_ext_path *path,
703 struct ldiskfs_ext_cache *cex,
704 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
705 struct ldiskfs_extent *ex,
709 struct bpointers *bp = cbdata;
710 struct ldiskfs_extent nex;
711 unsigned long pblock = 0;
717 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
718 if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
720 if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
726 if (bp->create == 0) {
728 if (cex->ec_block < bp->start)
729 i = bp->start - cex->ec_block;
730 if (i >= cex->ec_len)
731 CERROR("nothing to do?! i = %d, e_num = %u\n",
733 for (; i < cex->ec_len && bp->num; i++) {
743 tgen = LDISKFS_I(inode)->i_ext_generation;
744 count = ldiskfs_ext_calc_credits_for_insert(inode, path);
746 handle = osd_journal_start(inode, LDISKFS_HT_MISC,
747 count + LDISKFS_ALLOC_NEEDED + 1);
748 if (IS_ERR(handle)) {
749 return PTR_ERR(handle);
752 if (tgen != LDISKFS_I(inode)->i_ext_generation) {
753 /* the tree has changed. so path can be invalid at moment */
754 ldiskfs_journal_stop(handle);
758 /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
759 * protected by i_data_sem as whole. so we patch it to store
760 * generation to path and now verify the tree hasn't changed */
761 down_write((&LDISKFS_I(inode)->i_data_sem));
763 /* validate extent, make sure the extent tree does not changed */
764 if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
765 /* cex is invalid, try again */
766 up_write(&LDISKFS_I(inode)->i_data_sem);
767 ldiskfs_journal_stop(handle);
772 pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
775 BUG_ON(count > cex->ec_len);
777 /* insert new extent */
778 nex.ee_block = cpu_to_le32(cex->ec_block);
779 ldiskfs_ext_store_pblock(&nex, pblock);
780 nex.ee_len = cpu_to_le16(count);
781 err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
783 /* free data blocks we just allocated */
784 /* not a good idea to call discard here directly,
785 * but otherwise we'd need to call it every free() */
786 ldiskfs_discard_preallocations(inode);
787 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
788 ldiskfs_free_blocks(handle, inode, NULL,
789 ldiskfs_ext_pblock(&nex),
790 le16_to_cpu(nex.ee_len), 0);
792 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
793 le16_to_cpu(nex.ee_len), 0);
799 * Putting len of the actual extent we just inserted,
800 * we are asking ldiskfs_ext_walk_space() to continue
801 * scaning after that block
803 cex->ec_len = le16_to_cpu(nex.ee_len);
804 cex->ec_start = ldiskfs_ext_pblock(&nex);
805 BUG_ON(le16_to_cpu(nex.ee_len) == 0);
806 BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
809 up_write((&LDISKFS_I(inode)->i_data_sem));
810 ldiskfs_journal_stop(handle);
815 CERROR("hmm. why do we find this extent?\n");
816 CERROR("initial space: %lu:%u\n",
817 bp->start, bp->init_num);
818 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
819 CERROR("current extent: %u/%u/%llu %d\n",
820 cex->ec_block, cex->ec_len,
821 (unsigned long long)cex->ec_start,
824 CERROR("current extent: %u/%u/%llu\n",
825 cex->ec_block, cex->ec_len,
826 (unsigned long long)cex->ec_start);
830 if (cex->ec_block < bp->start)
831 i = bp->start - cex->ec_block;
832 if (i >= cex->ec_len)
833 CERROR("nothing to do?! i = %d, e_num = %u\n",
835 for (; i < cex->ec_len && bp->num; i++) {
836 *(bp->blocks) = cex->ec_start + i;
838 /* unmap any possible underlying metadata from
839 * the block device mapping. bug 6998. */
840 #ifndef HAVE_CLEAN_BDEV_ALIASES
841 unmap_underlying_metadata(inode->i_sb->s_bdev,
844 clean_bdev_aliases(inode->i_sb->s_bdev,
856 static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
857 int clen, sector_t *blocks, int create)
859 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
863 if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
867 bp.start = index * blocks_per_page;
868 bp.init_num = bp.num = clen * blocks_per_page;
871 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
872 bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
874 err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
875 ldiskfs_ext_new_extent_cb, &bp);
876 ldiskfs_ext_invalidate_cache(inode);
881 static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
882 struct page **page, int pages,
883 sector_t *blocks, int create)
885 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
886 pgoff_t bitmap_max_page_index;
890 bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
892 for (i = 0, b = blocks; i < pages; i++, page++) {
893 if ((*page)->index + 1 >= bitmap_max_page_index) {
897 rc = ldiskfs_map_inode_page(inode, *page, b, create);
899 CERROR("ino %lu, blk %llu create %d: rc %d\n",
901 (unsigned long long)*b, create, rc);
904 b += blocks_per_page;
909 static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
911 int pages, sector_t *blocks,
914 int rc = 0, i = 0, clen = 0;
915 struct page *fp = NULL;
917 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
918 inode->i_ino, pages, (*page)->index);
920 /* pages are sorted already. so, we just have to find
921 * contig. space and process them properly */
924 /* start new extent */
929 } else if (fp->index + clen == (*page)->index) {
930 /* continue the extent */
937 /* process found extent */
938 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
943 /* look for next extent */
945 blocks += clen * (PAGE_SIZE >> inode->i_blkbits);
949 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
956 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
957 int pages, sector_t *blocks,
962 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
963 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
967 rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
972 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
973 int pages, sector_t *blocks,
976 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
978 struct page *fp = NULL;
980 pgoff_t max_page_index;
981 handle_t *handle = NULL;
983 max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
985 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
986 inode->i_ino, pages, (*page)->index);
989 create = LDISKFS_GET_BLOCKS_CREATE;
990 handle = ldiskfs_journal_current_handle();
991 LASSERT(handle != NULL);
992 rc = osd_attach_jinode(inode);
996 /* pages are sorted already. so, we just have to find
997 * contig. space and process them properly */
999 long blen, total = 0;
1000 struct ldiskfs_map_blocks map = { 0 };
1002 if (fp == NULL) { /* start new extent */
1007 } else if (fp->index + clen == (*page)->index) {
1008 /* continue the extent */
1014 if (fp->index + clen >= max_page_index)
1015 GOTO(cleanup, rc = -EFBIG);
1016 /* process found extent */
1017 map.m_lblk = fp->index * blocks_per_page;
1018 map.m_len = blen = clen * blocks_per_page;
1020 rc = ldiskfs_map_blocks(handle, inode, &map, create);
1023 for (; total < blen && c < map.m_len; c++, total++) {
1025 *(blocks + total) = 0;
1029 *(blocks + total) = map.m_pblk + c;
1030 /* unmap any possible underlying
1031 * metadata from the block device
1032 * mapping. bug 6998. */
1033 if ((map.m_flags & LDISKFS_MAP_NEW) &&
1035 #ifndef HAVE_CLEAN_BDEV_ALIASES
1036 unmap_underlying_metadata(
1037 inode->i_sb->s_bdev,
1041 inode->i_sb->s_bdev,
1048 if (rc == 0 && total < blen) {
1049 map.m_lblk = fp->index * blocks_per_page + total;
1050 map.m_len = blen - total;
1056 /* look for next extent */
1058 blocks += blocks_per_page * clen;
1063 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
1065 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
1066 struct niobuf_local *lnb, int npages)
1068 struct osd_thread_info *oti = osd_oti_get(env);
1069 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1070 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1071 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1083 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1084 if (unlikely(rc != 0))
1087 isize = i_size_read(inode);
1088 maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
1090 if (osd->od_writethrough_cache)
1092 if (isize > osd->od_readcache_max_filesize)
1095 start = ktime_get();
1096 for (i = 0; i < npages; i++) {
1099 generic_error_remove_page(inode->i_mapping,
1103 * till commit the content of the page is undefined
1104 * we'll set it uptodate once bulk is done. otherwise
1105 * subsequent reads can access non-stable data
1107 ClearPageUptodate(lnb[i].lnb_page);
1109 if (lnb[i].lnb_len == PAGE_SIZE)
1112 if (maxidx >= lnb[i].lnb_page->index) {
1113 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1116 char *p = kmap(lnb[i].lnb_page);
1118 off = lnb[i].lnb_page_offset;
1121 off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1124 memset(p + off, 0, PAGE_SIZE - off);
1125 kunmap(lnb[i].lnb_page);
1129 timediff = ktime_us_delta(end, start);
1130 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1132 if (iobuf->dr_npages) {
1133 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1135 iobuf->dr_blocks, 0);
1136 if (likely(rc == 0)) {
1137 rc = osd_do_bio(osd, inode, iobuf);
1138 /* do IO stats for preparation reads */
1139 osd_fini_iobuf(osd, iobuf);
1145 struct osd_fextent {
1148 unsigned int mapped:1;
1151 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1152 struct osd_fextent *cached_extent)
1154 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1155 sector_t block = offset >> inode->i_blkbits;
1157 struct fiemap_extent_info fei = { 0 };
1158 struct fiemap_extent fe = { 0 };
1159 mm_segment_t saved_fs;
1162 if (block >= cached_extent->start && block < cached_extent->end)
1163 return cached_extent->mapped;
1165 if (i_size_read(inode) == 0)
1168 /* Beyond EOF, must not be mapped */
1169 if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1172 fei.fi_extents_max = 1;
1173 fei.fi_extents_start = &fe;
1175 saved_fs = get_fs();
1177 rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1182 start = fe.fe_logical >> inode->i_blkbits;
1184 if (start > block) {
1185 cached_extent->start = block;
1186 cached_extent->end = start;
1187 cached_extent->mapped = 0;
1189 cached_extent->start = start;
1190 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1192 cached_extent->mapped = 1;
1195 return cached_extent->mapped;
1198 static int osd_declare_write_commit(const struct lu_env *env,
1199 struct dt_object *dt,
1200 struct niobuf_local *lnb, int npages,
1201 struct thandle *handle)
1203 const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1204 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1205 struct osd_thandle *oh;
1213 long long quota_space = 0;
1214 struct osd_fextent extent = { 0 };
1215 enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1218 LASSERT(handle != NULL);
1219 oh = container_of0(handle, struct osd_thandle, ot_super);
1220 LASSERT(oh->ot_handle == NULL);
1224 /* calculate number of extents (probably better to pass nb) */
1225 for (i = 0; i < npages; i++) {
1226 if (i && lnb[i].lnb_file_offset !=
1227 lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1230 if (osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent))
1231 lnb[i].lnb_flags |= OBD_BRW_MAPPED;
1233 quota_space += PAGE_SIZE;
1235 /* ignore quota for the whole request if any page is from
1236 * client cache or written by root.
1238 * XXX once we drop the 1.8 client support, the checking
1239 * for whether page is from cache can be simplified as:
1240 * !(lnb[i].flags & OBD_BRW_SYNC)
1242 * XXX we could handle this on per-lnb basis as done by
1244 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1245 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1247 declare_flags |= OSD_QID_FORCE;
1251 * each extent can go into new leaf causing a split
1252 * 5 is max tree depth: inode + 4 index blocks
1253 * with blockmaps, depth is 3 at most
1255 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1257 * many concurrent threads may grow tree by the time
1258 * our transaction starts. so, consider 2 is a min depth
1260 depth = ext_depth(inode);
1261 depth = max(depth, 1) + 1;
1263 credits++; /* inode */
1264 credits += depth * 2 * extents;
1268 credits++; /* inode */
1269 credits += depth * extents;
1272 /* quota space for metadata blocks */
1273 quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1275 /* quota space should be reported in 1K blocks */
1276 quota_space = toqb(quota_space);
1278 /* each new block can go in different group (bitmap + gd) */
1280 /* we can't dirty more bitmap blocks than exist */
1281 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1282 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1284 credits += newblocks;
1286 /* we can't dirty more gd blocks than exist */
1287 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1288 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1290 credits += newblocks;
1292 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1294 /* make sure the over quota flags were not set */
1295 lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1297 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1298 i_projid_read(inode), quota_space, oh,
1299 osd_dt_obj(dt), &flags, declare_flags);
1301 /* we need only to store the overquota flags in the first lnb for
1302 * now, once we support multiple objects BRW, this code needs be
1304 if (flags & QUOTA_FL_OVER_USRQUOTA)
1305 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1306 if (flags & QUOTA_FL_OVER_GRPQUOTA)
1307 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1308 if (flags & QUOTA_FL_OVER_PRJQUOTA)
1309 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1312 rc = osd_trunc_lock(osd_dt_obj(dt), oh, true);
1317 /* Check if a block is allocated or not */
1318 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1319 struct niobuf_local *lnb, int npages,
1320 struct thandle *thandle)
1322 struct osd_thread_info *oti = osd_oti_get(env);
1323 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1324 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1325 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1331 rc = osd_init_iobuf(osd, iobuf, 1, npages);
1332 if (unlikely(rc != 0))
1335 isize = i_size_read(inode);
1336 ll_vfs_dq_init(inode);
1338 for (i = 0; i < npages; i++) {
1339 if (lnb[i].lnb_rc == -ENOSPC &&
1340 (lnb[i].lnb_flags & OBD_BRW_MAPPED)) {
1341 /* Allow the write to proceed if overwriting an
1346 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1347 CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1349 LASSERT(lnb[i].lnb_page);
1350 generic_error_remove_page(inode->i_mapping,
1355 LASSERT(PageLocked(lnb[i].lnb_page));
1356 LASSERT(!PageWriteback(lnb[i].lnb_page));
1358 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1359 isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1362 * Since write and truncate are serialized by oo_sem, even
1363 * partial-page truncate should not leave dirty pages in the
1366 LASSERT(!PageDirty(lnb[i].lnb_page));
1368 SetPageUptodate(lnb[i].lnb_page);
1370 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1373 osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1375 if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1377 } else if (iobuf->dr_npages > 0) {
1378 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1380 iobuf->dr_blocks, 1);
1382 /* no pages to write, no transno is needed */
1383 thandle->th_local = 1;
1386 if (likely(rc == 0)) {
1387 spin_lock(&inode->i_lock);
1388 if (isize > i_size_read(inode)) {
1389 i_size_write(inode, isize);
1390 LDISKFS_I(inode)->i_disksize = isize;
1391 spin_unlock(&inode->i_lock);
1392 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1394 spin_unlock(&inode->i_lock);
1397 rc = osd_do_bio(osd, inode, iobuf);
1398 /* we don't do stats here as in read path because
1399 * write is async: we'll do this in osd_put_bufs() */
1401 osd_fini_iobuf(osd, iobuf);
1404 osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1406 if (unlikely(rc != 0)) {
1407 /* if write fails, we should drop pages from the cache */
1408 for (i = 0; i < npages; i++) {
1409 if (lnb[i].lnb_page == NULL)
1411 LASSERT(PageLocked(lnb[i].lnb_page));
1412 generic_error_remove_page(inode->i_mapping,
1420 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1421 struct niobuf_local *lnb, int npages)
1423 struct osd_thread_info *oti = osd_oti_get(env);
1424 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1425 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1426 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1427 int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0;
1434 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1435 if (unlikely(rc != 0))
1438 isize = i_size_read(inode);
1440 if (osd->od_read_cache)
1442 if (isize > osd->od_readcache_max_filesize)
1445 start = ktime_get();
1446 for (i = 0; i < npages; i++) {
1448 if (isize <= lnb[i].lnb_file_offset)
1449 /* If there's no more data, abort early.
1450 * lnb->lnb_rc == 0, so it's easy to detect later. */
1453 if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len)
1454 lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset;
1456 lnb[i].lnb_rc = lnb[i].lnb_len;
1458 /* Bypass disk read if fail_loc is set properly */
1459 if (OBD_FAIL_CHECK(OBD_FAIL_OST_FAKE_RW))
1460 SetPageUptodate(lnb[i].lnb_page);
1462 if (PageUptodate(lnb[i].lnb_page)) {
1466 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1470 generic_error_remove_page(inode->i_mapping,
1474 timediff = ktime_us_delta(end, start);
1475 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1477 if (cache_hits != 0)
1478 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1480 if (cache_misses != 0)
1481 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1483 if (cache_hits + cache_misses != 0)
1484 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1485 cache_hits + cache_misses);
1487 if (iobuf->dr_npages) {
1488 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1490 iobuf->dr_blocks, 0);
1491 rc = osd_do_bio(osd, inode, iobuf);
1493 /* IO stats will be done in osd_bufs_put() */
1500 * XXX: Another layering violation for now.
1502 * We don't want to use ->f_op->read methods, because generic file write
1504 * - serializes on ->i_sem, and
1506 * - does a lot of extra work like balance_dirty_pages(),
1508 * which doesn't work for globally shared files like /last_rcvd.
1510 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1512 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1514 memcpy(buffer, (char *)ei->i_data, buflen);
1519 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1521 struct buffer_head *bh;
1522 unsigned long block;
1528 /* prevent reading after eof */
1529 spin_lock(&inode->i_lock);
1530 if (i_size_read(inode) < *offs + size) {
1531 loff_t diff = i_size_read(inode) - *offs;
1532 spin_unlock(&inode->i_lock);
1534 CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1535 i_size_read(inode), *offs);
1537 } else if (diff == 0) {
1543 spin_unlock(&inode->i_lock);
1546 blocksize = 1 << inode->i_blkbits;
1549 block = *offs >> inode->i_blkbits;
1550 boffs = *offs & (blocksize - 1);
1551 csize = min(blocksize - boffs, size);
1552 bh = __ldiskfs_bread(NULL, inode, block, 0);
1554 CERROR("%s: can't read %u@%llu on ino %lu: "
1555 "rc = %ld\n", osd_ino2name(inode),
1556 csize, *offs, inode->i_ino,
1562 memcpy(buf, bh->b_data + boffs, csize);
1565 memset(buf, 0, csize);
1575 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1576 struct lu_buf *buf, loff_t *pos)
1578 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1581 /* Read small symlink from inode body as we need to maintain correct
1582 * on-disk symlinks for ldiskfs.
1584 if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1585 (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1586 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1588 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1593 static inline int osd_extents_enabled(struct super_block *sb,
1594 struct inode *inode)
1596 if (inode != NULL) {
1597 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1599 } else if (ldiskfs_has_feature_extents(sb)) {
1605 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1606 const loff_t size, const loff_t pos,
1609 int credits, bits, bs, i;
1611 bits = sb->s_blocksize_bits;
1614 /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1615 * we do not expect blockmaps on the large files,
1616 * so let's shrink it to 2 levels (4GB files) */
1618 /* this is default reservation: 2 levels */
1619 credits = (blocks + 2) * 3;
1621 /* actual offset is unknown, hard to optimize */
1625 /* now check for few specific cases to optimize */
1626 if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1629 /* allocate if not allocated */
1630 if (inode == NULL) {
1631 credits += blocks * 2;
1634 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1635 LASSERT(i < LDISKFS_NDIR_BLOCKS);
1636 if (LDISKFS_I(inode)->i_data[i] == 0)
1639 } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1640 /* single indirect */
1641 credits = blocks * 3;
1642 if (inode == NULL ||
1643 LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1646 /* The indirect block may be modified. */
1653 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1654 const struct lu_buf *buf, loff_t _pos,
1655 struct thandle *handle)
1657 struct osd_object *obj = osd_dt_obj(dt);
1658 struct inode *inode = obj->oo_inode;
1659 struct super_block *sb = osd_sb(osd_obj2dev(obj));
1660 struct osd_thandle *oh;
1661 int rc = 0, est = 0, credits, blocks, allocated = 0;
1667 LASSERT(buf != NULL);
1668 LASSERT(handle != NULL);
1670 oh = container_of0(handle, struct osd_thandle, ot_super);
1671 LASSERT(oh->ot_handle == NULL);
1674 bits = sb->s_blocksize_bits;
1678 /* if this is an append, then we
1679 * should expect cross-block record */
1685 /* blocks to modify */
1686 blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1687 LASSERT(blocks > 0);
1689 if (inode != NULL && _pos != -1) {
1690 /* object size in blocks */
1691 est = (i_size_read(inode) + bs - 1) >> bits;
1692 allocated = inode->i_blocks >> (bits - 9);
1693 if (pos + size <= i_size_read(inode) && est <= allocated) {
1694 /* looks like an overwrite, no need to modify tree */
1696 /* no need to modify i_size */
1701 if (osd_extents_enabled(sb, inode)) {
1703 * many concurrent threads may grow tree by the time
1704 * our transaction starts. so, consider 2 is a min depth
1705 * for every level we may need to allocate a new block
1706 * and take some entries from the old one. so, 3 blocks
1707 * to allocate (bitmap, gd, itself) + old block - 4 per
1710 depth = inode != NULL ? ext_depth(inode) : 0;
1711 depth = max(depth, 1) + 1;
1713 /* if not append, then split may need to modify
1714 * existing blocks moving entries into the new ones */
1717 /* blocks to store data: bitmap,gd,itself */
1718 credits += blocks * 3;
1720 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1722 /* if inode is created as part of the transaction,
1723 * then it's counted already by the creation method */
1729 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1731 /* dt_declare_write() is usually called for system objects, such
1732 * as llog or last_rcvd files. We needn't enforce quota on those
1733 * objects, so always set the lqi_space as 0. */
1735 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1737 i_projid_read(inode), 0,
1738 oh, obj, NULL, OSD_QID_BLK);
1741 rc = osd_trunc_lock(obj, oh, true);
1746 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1748 /* LU-2634: clear the extent format for fast symlink */
1749 ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1751 memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1752 spin_lock(&inode->i_lock);
1753 LDISKFS_I(inode)->i_disksize = buflen;
1754 i_size_write(inode, buflen);
1755 spin_unlock(&inode->i_lock);
1756 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1761 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1762 int write_NUL, loff_t *offs, handle_t *handle)
1764 struct buffer_head *bh = NULL;
1765 loff_t offset = *offs;
1766 loff_t new_size = i_size_read(inode);
1767 unsigned long block;
1768 int blocksize = 1 << inode->i_blkbits;
1772 int dirty_inode = 0;
1776 * long symlink write does not count the NUL terminator in
1777 * bufsize, we write it, and the inode's file size does not
1778 * count the NUL terminator as well.
1780 ((char *)buf)[bufsize] = '\0';
1784 while (bufsize > 0) {
1785 int credits = handle->h_buffer_credits;
1790 block = offset >> inode->i_blkbits;
1791 boffs = offset & (blocksize - 1);
1792 size = min(blocksize - boffs, bufsize);
1793 bh = __ldiskfs_bread(handle, inode, block, 1);
1794 if (IS_ERR_OR_NULL(bh)) {
1802 CERROR("%s: error reading offset %llu (block %lu, "
1803 "size %d, offs %llu), credits %d/%d: rc = %d\n",
1804 inode->i_sb->s_id, offset, block, bufsize, *offs,
1805 credits, handle->h_buffer_credits, err);
1809 err = ldiskfs_journal_get_write_access(handle, bh);
1811 CERROR("journal_get_write_access() returned error %d\n",
1815 LASSERTF(boffs + size <= bh->b_size,
1816 "boffs %d size %d bh->b_size %lu\n",
1817 boffs, size, (unsigned long)bh->b_size);
1818 memcpy(bh->b_data + boffs, buf, size);
1819 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
1823 if (offset + size > new_size)
1824 new_size = offset + size;
1834 /* correct in-core and on-disk sizes */
1835 if (new_size > i_size_read(inode)) {
1836 spin_lock(&inode->i_lock);
1837 if (new_size > i_size_read(inode))
1838 i_size_write(inode, new_size);
1839 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1840 LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1843 spin_unlock(&inode->i_lock);
1845 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1853 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1854 const struct lu_buf *buf, loff_t *pos,
1855 struct thandle *handle, int ignore_quota)
1857 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1858 struct osd_thandle *oh;
1862 LASSERT(dt_object_exists(dt));
1864 LASSERT(handle != NULL);
1865 LASSERT(inode != NULL);
1866 ll_vfs_dq_init(inode);
1868 /* XXX: don't check: one declared chunk can be used many times */
1869 /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1871 oh = container_of(handle, struct osd_thandle, ot_super);
1872 LASSERT(oh->ot_handle->h_transaction != NULL);
1873 osd_trans_exec_op(env, handle, OSD_OT_WRITE);
1875 /* Write small symlink to inode body as we need to maintain correct
1876 * on-disk symlinks for ldiskfs.
1877 * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1878 * does not count it in.
1880 is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1881 if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1882 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1884 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1885 buf->lb_len, is_link, pos,
1888 result = buf->lb_len;
1890 osd_trans_exec_check(env, handle, OSD_OT_WRITE);
1895 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1896 __u64 start, __u64 end, struct thandle *th)
1898 struct osd_thandle *oh;
1899 struct inode *inode;
1904 oh = container_of(th, struct osd_thandle, ot_super);
1907 * we don't need to reserve credits for whole truncate
1908 * it's not possible as truncate may need to free too many
1909 * blocks and that won't fit a single transaction. instead
1910 * we reserve credits to change i_size and put inode onto
1911 * orphan list. if needed truncate will extend or restart
1914 osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1915 osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1917 inode = osd_dt_obj(dt)->oo_inode;
1920 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1921 i_projid_read(inode), 0, oh, osd_dt_obj(dt),
1925 rc = osd_trunc_lock(osd_dt_obj(dt), oh, false);
1930 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1931 __u64 start, __u64 end, struct thandle *th)
1933 struct osd_object *obj = osd_dt_obj(dt);
1934 struct osd_device *osd = osd_obj2dev(obj);
1935 struct inode *inode = obj->oo_inode;
1936 struct osd_access_lock *al;
1937 struct osd_thandle *oh;
1938 int rc = 0, found = 0;
1942 LASSERT(end == OBD_OBJECT_EOF);
1943 LASSERT(dt_object_exists(dt));
1944 LASSERT(osd_invariant(obj));
1945 LASSERT(inode != NULL);
1946 ll_vfs_dq_init(inode);
1949 oh = container_of(th, struct osd_thandle, ot_super);
1950 LASSERT(oh->ot_handle->h_transaction != NULL);
1952 /* we used to skip truncate to current size to
1953 * optimize truncates on OST. with DoM we can
1954 * get attr_set to set specific size (MDS_REINT)
1955 * and then get truncate RPC which essentially
1956 * would be skipped. this is bad.. so, disable
1957 * this optimization on MDS till the client stop
1958 * to sent MDS_REINT (LU-11033) -bzzz */
1959 if (osd->od_is_ost && i_size_read(inode) == start)
1962 osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1964 spin_lock(&inode->i_lock);
1965 if (i_size_read(inode) < start)
1967 i_size_write(inode, start);
1968 spin_unlock(&inode->i_lock);
1969 ll_truncate_pagecache(inode, start);
1971 /* optimize grow case */
1973 osd_execute_truncate(obj);
1977 /* add to orphan list to ensure truncate completion
1978 * if this transaction succeed. ldiskfs_truncate()
1979 * will take the inode out of the list */
1980 rc = ldiskfs_orphan_add(oh->ot_handle, inode);
1984 list_for_each_entry(al, &oh->ot_trunc_locks, tl_list) {
1985 if (obj != al->tl_obj)
1987 LASSERT(al->tl_shared == 0);
1989 /* do actual truncate in osd_trans_stop() */
1990 al->tl_truncate = 1;
1999 static int fiemap_check_ranges(struct inode *inode,
2000 u64 start, u64 len, u64 *new_len)
2009 if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
2010 maxbytes = inode->i_sb->s_maxbytes;
2012 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
2014 if (start > maxbytes)
2018 * Shrink request scope to what the fs can actually handle.
2020 if (len > maxbytes || (maxbytes - len) < start)
2021 *new_len = maxbytes - start;
2026 /* So that the fiemap access checks can't overflow on 32 bit machines. */
2027 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
2029 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
2032 struct fiemap_extent_info fieinfo = {0, };
2033 struct inode *inode = osd_dt_obj(dt)->oo_inode;
2039 if (inode->i_op->fiemap == NULL)
2042 if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
2045 rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
2049 fieinfo.fi_flags = fm->fm_flags;
2050 fieinfo.fi_extents_max = fm->fm_extent_count;
2051 fieinfo.fi_extents_start = fm->fm_extents;
2053 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
2054 filemap_write_and_wait(inode->i_mapping);
2056 rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
2057 fm->fm_flags = fieinfo.fi_flags;
2058 fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
2063 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
2064 __u64 start, __u64 end, enum lu_ladvise_type advice)
2067 struct inode *inode = osd_dt_obj(dt)->oo_inode;
2071 case LU_LADVISE_DONTNEED:
2074 invalidate_mapping_pages(inode->i_mapping,
2075 start >> PAGE_SHIFT,
2076 (end - 1) >> PAGE_SHIFT);
2087 * in some cases we may need declare methods for objects being created
2088 * e.g., when we create symlink
2090 const struct dt_body_operations osd_body_ops_new = {
2091 .dbo_declare_write = osd_declare_write,
2094 const struct dt_body_operations osd_body_ops = {
2095 .dbo_read = osd_read,
2096 .dbo_declare_write = osd_declare_write,
2097 .dbo_write = osd_write,
2098 .dbo_bufs_get = osd_bufs_get,
2099 .dbo_bufs_put = osd_bufs_put,
2100 .dbo_write_prep = osd_write_prep,
2101 .dbo_declare_write_commit = osd_declare_write_commit,
2102 .dbo_write_commit = osd_write_commit,
2103 .dbo_read_prep = osd_read_prep,
2104 .dbo_declare_punch = osd_declare_punch,
2105 .dbo_punch = osd_punch,
2106 .dbo_fiemap_get = osd_fiemap_get,
2107 .dbo_ladvise = osd_ladvise,
2111 * Get a truncate lock
2113 * In order to take multi-transaction truncate out of main transaction we let
2114 * the caller grab a lock on the object passed. the lock can be shared (for
2115 * writes) and exclusive (for truncate). It's not allowed to mix truncate
2116 * and write in the same transaction handle (do not confuse with big ldiskfs
2117 * transaction containing lots of handles).
2118 * The lock must be taken at declaration.
2120 * \param obj object to lock
2122 * \shared shared or exclusive
2124 * \retval 0 lock is granted
2125 * \retval -NOMEM no memory to allocate lock
2127 int osd_trunc_lock(struct osd_object *obj, struct osd_thandle *oh, bool shared)
2129 struct osd_access_lock *al, *tmp;
2134 list_for_each_entry(tmp, &oh->ot_trunc_locks, tl_list) {
2135 if (tmp->tl_obj != obj)
2137 LASSERT(tmp->tl_shared == shared);
2138 /* found same lock */
2143 if (unlikely(al == NULL))
2146 al->tl_truncate = false;
2148 down_read(&obj->oo_ext_idx_sem);
2150 down_write(&obj->oo_ext_idx_sem);
2151 al->tl_shared = shared;
2153 list_add(&al->tl_list, &oh->ot_trunc_locks);
2158 void osd_trunc_unlock_all(struct list_head *list)
2160 struct osd_access_lock *al, *tmp;
2161 list_for_each_entry_safe(al, tmp, list, tl_list) {
2163 up_read(&al->tl_obj->oo_ext_idx_sem);
2165 up_write(&al->tl_obj->oo_ext_idx_sem);
2166 list_del(&al->tl_list);
2171 void osd_execute_truncate(struct osd_object *obj)
2173 struct inode *inode = obj->oo_inode;
2176 /* simulate crash before (in the middle) of delayed truncate */
2177 if (OBD_FAIL_CHECK(OBD_FAIL_OSD_FAIL_AT_TRUNCATE)) {
2178 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
2179 struct ldiskfs_sb_info *sbi = LDISKFS_SB(inode->i_sb);
2181 mutex_lock(&sbi->s_orphan_lock);
2182 list_del_init(&ei->i_orphan);
2183 mutex_unlock(&sbi->s_orphan_lock);
2187 #ifdef HAVE_INODEOPS_TRUNCATE
2188 if (inode->i_op->truncate)
2189 inode->i_op->truncate(inode);
2192 ldiskfs_truncate(inode);
2195 * For a partial-page truncate, flush the page to disk immediately to
2196 * avoid data corruption during direct disk write. b=17397
2198 size = i_size_read(inode);
2199 if ((size & ~PAGE_MASK) != 0)
2200 filemap_fdatawrite_range(inode->i_mapping, size, size + 1);
2203 void osd_process_truncates(struct list_head *list)
2205 struct osd_access_lock *al;
2207 LASSERT(journal_current_handle() == NULL);
2209 list_for_each_entry(al, list, tl_list) {
2212 if (!al->tl_truncate)
2214 osd_execute_truncate(al->tl_obj);