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, 2016, 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 /* LUSTRE_VERSION_CODE */
42 #include <lustre_ver.h>
43 /* prerequisite for linux/xattr.h */
44 #include <linux/types.h>
45 /* prerequisite for linux/xattr.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 = 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],
140 #ifndef REQ_WRITE /* pre-2.6.35 */
141 #define __REQ_WRITE BIO_RW
144 #ifdef HAVE_BIO_ENDIO_USES_ONE_ARG
145 static void dio_complete_routine(struct bio *bio)
147 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.hpdd.intel.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, bi_rw: %lu, bi_vcnt: %d, "
169 "bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, "
170 "bi_private: %p\n", bio->bi_next,
171 (unsigned long)bio->bi_flags,
172 bio->bi_rw, bio->bi_vcnt, bio_idx(bio),
173 bio_sectors(bio) << 9, bio->bi_end_io,
175 atomic_read(&bio->bi_cnt),
177 atomic_read(&bio->__bi_cnt),
183 /* the check is outside of the cycle for performance reason -bzzz */
184 if (!test_bit(__REQ_WRITE, &bio->bi_rw)) {
185 bio_for_each_segment_all(bvl, bio, iter) {
186 if (likely(error == 0))
187 SetPageUptodate(bvl_to_page(bvl));
188 LASSERT(PageLocked(bvl_to_page(bvl)));
190 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
192 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
195 /* any real error is good enough -bzzz */
196 if (error != 0 && iobuf->dr_error == 0)
197 iobuf->dr_error = error;
200 * set dr_elapsed before dr_numreqs turns to 0, otherwise
201 * it's possible that service thread will see dr_numreqs
202 * is zero, but dr_elapsed is not set yet, leading to lost
203 * data in this processing and an assertion in a subsequent
206 if (atomic_read(&iobuf->dr_numreqs) == 1) {
207 iobuf->dr_elapsed = jiffies - iobuf->dr_start_time;
208 iobuf->dr_elapsed_valid = 1;
210 if (atomic_dec_and_test(&iobuf->dr_numreqs))
211 wake_up(&iobuf->dr_wait);
213 /* Completed bios used to be chained off iobuf->dr_bios and freed in
214 * filter_clear_dreq(). It was then possible to exhaust the biovec-256
215 * mempool when serious on-disk fragmentation was encountered,
216 * deadlocking the OST. The bios are now released as soon as complete
217 * so the pool cannot be exhausted while IOs are competing. bug 10076 */
221 static void record_start_io(struct osd_iobuf *iobuf, int size)
223 struct osd_device *osd = iobuf->dr_dev;
224 struct obd_histogram *h = osd->od_brw_stats.hist;
227 atomic_inc(&iobuf->dr_numreqs);
229 if (iobuf->dr_rw == 0) {
230 atomic_inc(&osd->od_r_in_flight);
231 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
232 atomic_read(&osd->od_r_in_flight));
233 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
234 } else if (iobuf->dr_rw == 1) {
235 atomic_inc(&osd->od_w_in_flight);
236 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
237 atomic_read(&osd->od_w_in_flight));
238 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
244 static void osd_submit_bio(int rw, struct bio *bio)
246 LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
248 submit_bio(READ, bio);
250 submit_bio(WRITE, bio);
253 static int can_be_merged(struct bio *bio, sector_t sector)
258 return bio_end_sector(bio) == sector ? 1 : 0;
261 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
262 struct osd_iobuf *iobuf)
264 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
265 struct page **pages = iobuf->dr_pages;
266 int npages = iobuf->dr_npages;
267 sector_t *blocks = iobuf->dr_blocks;
268 int total_blocks = npages * blocks_per_page;
269 int sector_bits = inode->i_sb->s_blocksize_bits - 9;
270 unsigned int blocksize = inode->i_sb->s_blocksize;
271 struct bio *bio = NULL;
273 unsigned int page_offset;
283 LASSERT(iobuf->dr_npages == npages);
285 osd_brw_stats_update(osd, iobuf);
286 iobuf->dr_start_time = cfs_time_current();
288 blk_start_plug(&plug);
289 for (page_idx = 0, block_idx = 0;
291 page_idx++, block_idx += blocks_per_page) {
293 page = pages[page_idx];
294 LASSERT(block_idx + blocks_per_page <= total_blocks);
296 for (i = 0, page_offset = 0;
298 i += nblocks, page_offset += blocksize * nblocks) {
302 if (blocks[block_idx + i] == 0) { /* hole */
303 LASSERTF(iobuf->dr_rw == 0,
304 "page_idx %u, block_idx %u, i %u\n",
305 page_idx, block_idx, i);
306 memset(kmap(page) + page_offset, 0, blocksize);
311 sector = (sector_t)blocks[block_idx + i] << sector_bits;
313 /* Additional contiguous file blocks? */
314 while (i + nblocks < blocks_per_page &&
315 (sector + (nblocks << sector_bits)) ==
316 ((sector_t)blocks[block_idx + i + nblocks] <<
321 can_be_merged(bio, sector) &&
322 bio_add_page(bio, page,
323 blocksize * nblocks, page_offset) != 0)
324 continue; /* added this frag OK */
327 struct request_queue *q =
328 bdev_get_queue(bio->bi_bdev);
329 unsigned int bi_size = bio_sectors(bio) << 9;
331 /* Dang! I have to fragment this I/O */
332 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
333 "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
334 bi_size, bio->bi_vcnt, bio->bi_max_vecs,
336 queue_max_sectors(q),
337 bio_phys_segments(q, bio),
338 queue_max_phys_segments(q),
339 0, queue_max_hw_segments(q));
340 record_start_io(iobuf, bi_size);
341 osd_submit_bio(iobuf->dr_rw, bio);
344 /* allocate new bio */
345 bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
346 (npages - page_idx) *
349 CERROR("Can't allocate bio %u*%u = %u pages\n",
350 (npages - page_idx), blocks_per_page,
351 (npages - page_idx) * blocks_per_page);
356 bio->bi_bdev = inode->i_sb->s_bdev;
357 bio_set_sector(bio, sector);
358 bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
359 bio->bi_end_io = dio_complete_routine;
360 bio->bi_private = iobuf;
362 rc = bio_add_page(bio, page,
363 blocksize * nblocks, page_offset);
369 record_start_io(iobuf, bio_sectors(bio) << 9);
370 osd_submit_bio(iobuf->dr_rw, bio);
375 blk_finish_plug(&plug);
377 /* in order to achieve better IO throughput, we don't wait for writes
378 * completion here. instead we proceed with transaction commit in
379 * parallel and wait for IO completion once transaction is stopped
380 * see osd_trans_stop() for more details -bzzz */
381 if (iobuf->dr_rw == 0) {
382 wait_event(iobuf->dr_wait,
383 atomic_read(&iobuf->dr_numreqs) == 0);
384 osd_fini_iobuf(osd, iobuf);
388 rc = iobuf->dr_error;
392 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
393 struct niobuf_local *lnb)
400 int poff = offset & (PAGE_SIZE - 1);
401 int plen = PAGE_SIZE - poff;
405 lnb->lnb_file_offset = offset;
406 lnb->lnb_page_offset = poff;
408 /* lnb->lnb_flags = rnb->rnb_flags; */
410 lnb->lnb_page = NULL;
413 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
424 static struct page *osd_get_page(struct dt_object *dt, loff_t offset, int rw)
426 struct inode *inode = osd_dt_obj(dt)->oo_inode;
427 struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
432 page = find_or_create_page(inode->i_mapping, offset >> PAGE_SHIFT,
433 GFP_NOFS | __GFP_HIGHMEM);
434 if (unlikely(page == NULL))
435 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
441 * there are following "locks":
452 * - lock pages, unlock
454 * - lock partial page
460 * Unlock and release pages loaded by osd_bufs_get()
462 * Unlock \a npages pages from \a lnb and drop the refcount on them.
464 * \param env thread execution environment
465 * \param dt dt object undergoing IO (OSD object + methods)
466 * \param lnb array of pages undergoing IO
467 * \param npages number of pages in \a lnb
471 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
472 struct niobuf_local *lnb, int npages)
476 for (i = 0; i < npages; i++) {
477 if (lnb[i].lnb_page == NULL)
479 LASSERT(PageLocked(lnb[i].lnb_page));
480 unlock_page(lnb[i].lnb_page);
481 put_page(lnb[i].lnb_page);
482 dt_object_put(env, dt);
483 lnb[i].lnb_page = NULL;
490 * Load and lock pages undergoing IO
492 * Pages as described in the \a lnb array are fetched (from disk or cache)
493 * and locked for IO by the caller.
495 * DLM locking protects us from write and truncate competing for same region,
496 * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
497 * It's possible the writeout on a such a page is in progress when we access
498 * it. It's also possible that during this writeout we put new (partial) data
499 * into the page, but won't be able to proceed in filter_commitrw_write().
500 * Therefore, just wait for writeout completion as it should be rare enough.
502 * \param env thread execution environment
503 * \param dt dt object undergoing IO (OSD object + methods)
504 * \param pos byte offset of IO start
505 * \param len number of bytes of IO
506 * \param lnb array of extents undergoing IO
507 * \param rw read or write operation?
508 * \param capa capabilities
510 * \retval pages (zero or more) loaded successfully
511 * \retval -ENOMEM on memory/page allocation error
513 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
514 loff_t pos, ssize_t len, struct niobuf_local *lnb,
517 struct osd_object *obj = osd_dt_obj(dt);
518 int npages, i, rc = 0;
520 LASSERT(obj->oo_inode);
522 osd_map_remote_to_local(pos, len, &npages, lnb);
524 for (i = 0; i < npages; i++, lnb++) {
525 lnb->lnb_page = osd_get_page(dt, lnb->lnb_file_offset, rw);
526 if (lnb->lnb_page == NULL)
527 GOTO(cleanup, rc = -ENOMEM);
529 wait_on_page_writeback(lnb->lnb_page);
530 BUG_ON(PageWriteback(lnb->lnb_page));
532 lu_object_get(&dt->do_lu);
539 osd_bufs_put(env, dt, lnb - i, i);
543 #ifndef HAVE_LDISKFS_MAP_BLOCKS
545 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
546 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
557 static long ldiskfs_ext_find_goal(struct inode *inode,
558 struct ldiskfs_ext_path *path,
559 unsigned long block, int *aflags)
561 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
562 unsigned long bg_start;
563 unsigned long colour;
567 struct ldiskfs_extent *ex;
568 depth = path->p_depth;
570 /* try to predict block placement */
571 if ((ex = path[depth].p_ext))
572 return ldiskfs_ext_pblock(ex) +
573 (block - le32_to_cpu(ex->ee_block));
575 /* it looks index is empty
576 * try to find starting from index itself */
577 if (path[depth].p_bh)
578 return path[depth].p_bh->b_blocknr;
581 /* OK. use inode's group */
582 bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
583 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
584 colour = (current->pid % 16) *
585 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
586 return bg_start + colour + block;
589 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
590 struct ldiskfs_ext_path *path,
591 unsigned long block, unsigned long *count,
594 struct ldiskfs_allocation_request ar;
595 unsigned long pblock;
598 /* find neighbour allocated blocks */
600 *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
604 *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
608 /* allocate new block */
609 ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
613 ar.flags = LDISKFS_MB_HINT_DATA;
614 pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
619 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
620 struct ldiskfs_ext_path *path,
621 struct ldiskfs_ext_cache *cex,
622 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
623 struct ldiskfs_extent *ex,
627 struct bpointers *bp = cbdata;
628 struct ldiskfs_extent nex;
629 unsigned long pblock = 0;
635 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
636 if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
638 if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
644 if (bp->create == 0) {
646 if (cex->ec_block < bp->start)
647 i = bp->start - cex->ec_block;
648 if (i >= cex->ec_len)
649 CERROR("nothing to do?! i = %d, e_num = %u\n",
651 for (; i < cex->ec_len && bp->num; i++) {
661 tgen = LDISKFS_I(inode)->i_ext_generation;
662 count = ldiskfs_ext_calc_credits_for_insert(inode, path);
664 handle = osd_journal_start(inode, LDISKFS_HT_MISC,
665 count + LDISKFS_ALLOC_NEEDED + 1);
666 if (IS_ERR(handle)) {
667 return PTR_ERR(handle);
670 if (tgen != LDISKFS_I(inode)->i_ext_generation) {
671 /* the tree has changed. so path can be invalid at moment */
672 ldiskfs_journal_stop(handle);
676 /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
677 * protected by i_data_sem as whole. so we patch it to store
678 * generation to path and now verify the tree hasn't changed */
679 down_write((&LDISKFS_I(inode)->i_data_sem));
681 /* validate extent, make sure the extent tree does not changed */
682 if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
683 /* cex is invalid, try again */
684 up_write(&LDISKFS_I(inode)->i_data_sem);
685 ldiskfs_journal_stop(handle);
690 pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
693 BUG_ON(count > cex->ec_len);
695 /* insert new extent */
696 nex.ee_block = cpu_to_le32(cex->ec_block);
697 ldiskfs_ext_store_pblock(&nex, pblock);
698 nex.ee_len = cpu_to_le16(count);
699 err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
701 /* free data blocks we just allocated */
702 /* not a good idea to call discard here directly,
703 * but otherwise we'd need to call it every free() */
704 ldiskfs_discard_preallocations(inode);
705 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
706 ldiskfs_free_blocks(handle, inode, NULL,
707 ldiskfs_ext_pblock(&nex),
708 le16_to_cpu(nex.ee_len), 0);
710 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
711 le16_to_cpu(nex.ee_len), 0);
717 * Putting len of the actual extent we just inserted,
718 * we are asking ldiskfs_ext_walk_space() to continue
719 * scaning after that block
721 cex->ec_len = le16_to_cpu(nex.ee_len);
722 cex->ec_start = ldiskfs_ext_pblock(&nex);
723 BUG_ON(le16_to_cpu(nex.ee_len) == 0);
724 BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
727 up_write((&LDISKFS_I(inode)->i_data_sem));
728 ldiskfs_journal_stop(handle);
733 CERROR("hmm. why do we find this extent?\n");
734 CERROR("initial space: %lu:%u\n",
735 bp->start, bp->init_num);
736 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
737 CERROR("current extent: %u/%u/%llu %d\n",
738 cex->ec_block, cex->ec_len,
739 (unsigned long long)cex->ec_start,
742 CERROR("current extent: %u/%u/%llu\n",
743 cex->ec_block, cex->ec_len,
744 (unsigned long long)cex->ec_start);
748 if (cex->ec_block < bp->start)
749 i = bp->start - cex->ec_block;
750 if (i >= cex->ec_len)
751 CERROR("nothing to do?! i = %d, e_num = %u\n",
753 for (; i < cex->ec_len && bp->num; i++) {
754 *(bp->blocks) = cex->ec_start + i;
756 /* unmap any possible underlying metadata from
757 * the block device mapping. bug 6998. */
758 unmap_underlying_metadata(inode->i_sb->s_bdev,
769 static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
770 int clen, sector_t *blocks, int create)
772 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
776 if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
780 bp.start = index * blocks_per_page;
781 bp.init_num = bp.num = clen * blocks_per_page;
784 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
785 bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
787 err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
788 ldiskfs_ext_new_extent_cb, &bp);
789 ldiskfs_ext_invalidate_cache(inode);
794 static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
795 struct page **page, int pages,
796 sector_t *blocks, int create)
798 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
799 pgoff_t bitmap_max_page_index;
803 bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
805 for (i = 0, b = blocks; i < pages; i++, page++) {
806 if ((*page)->index + 1 >= bitmap_max_page_index) {
810 rc = ldiskfs_map_inode_page(inode, *page, b, create);
812 CERROR("ino %lu, blk %llu create %d: rc %d\n",
814 (unsigned long long)*b, create, rc);
817 b += blocks_per_page;
822 static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
824 int pages, sector_t *blocks,
827 int rc = 0, i = 0, clen = 0;
828 struct page *fp = NULL;
830 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
831 inode->i_ino, pages, (*page)->index);
833 /* pages are sorted already. so, we just have to find
834 * contig. space and process them properly */
837 /* start new extent */
842 } else if (fp->index + clen == (*page)->index) {
843 /* continue the extent */
850 /* process found extent */
851 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
856 /* look for next extent */
858 blocks += clen * (PAGE_SIZE >> inode->i_blkbits);
862 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
869 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
870 int pages, sector_t *blocks,
875 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
876 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
880 rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
885 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
886 int pages, sector_t *blocks,
889 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
891 struct page *fp = NULL;
893 pgoff_t max_page_index;
894 handle_t *handle = NULL;
896 max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
898 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
899 inode->i_ino, pages, (*page)->index);
902 create = LDISKFS_GET_BLOCKS_CREATE;
903 handle = ldiskfs_journal_current_handle();
904 LASSERT(handle != NULL);
905 rc = osd_attach_jinode(inode);
909 /* pages are sorted already. so, we just have to find
910 * contig. space and process them properly */
912 long blen, total = 0;
913 struct ldiskfs_map_blocks map = { 0 };
915 if (fp == NULL) { /* start new extent */
920 } else if (fp->index + clen == (*page)->index) {
921 /* continue the extent */
927 if (fp->index + clen >= max_page_index)
928 GOTO(cleanup, rc = -EFBIG);
929 /* process found extent */
930 map.m_lblk = fp->index * blocks_per_page;
931 map.m_len = blen = clen * blocks_per_page;
933 rc = ldiskfs_map_blocks(handle, inode, &map, create);
936 for (; total < blen && c < map.m_len; c++, total++) {
938 *(blocks + total) = 0;
942 *(blocks + total) = map.m_pblk + c;
943 /* unmap any possible underlying
944 * metadata from the block device
945 * mapping. bug 6998. */
946 if ((map.m_flags & LDISKFS_MAP_NEW) &&
948 unmap_underlying_metadata(
955 if (rc == 0 && total < blen) {
956 map.m_lblk = fp->index * blocks_per_page + total;
957 map.m_len = blen - total;
963 /* look for next extent */
965 blocks += blocks_per_page * clen;
970 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
972 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
973 struct niobuf_local *lnb, int npages)
975 struct osd_thread_info *oti = osd_oti_get(env);
976 struct osd_iobuf *iobuf = &oti->oti_iobuf;
977 struct inode *inode = osd_dt_obj(dt)->oo_inode;
978 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
990 rc = osd_init_iobuf(osd, iobuf, 0, npages);
991 if (unlikely(rc != 0))
994 isize = i_size_read(inode);
995 maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
997 if (osd->od_writethrough_cache)
999 if (isize > osd->od_readcache_max_filesize)
1002 start = ktime_get();
1003 for (i = 0; i < npages; i++) {
1006 generic_error_remove_page(inode->i_mapping,
1010 * till commit the content of the page is undefined
1011 * we'll set it uptodate once bulk is done. otherwise
1012 * subsequent reads can access non-stable data
1014 ClearPageUptodate(lnb[i].lnb_page);
1016 if (lnb[i].lnb_len == PAGE_SIZE)
1019 if (maxidx >= lnb[i].lnb_page->index) {
1020 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1023 char *p = kmap(lnb[i].lnb_page);
1025 off = lnb[i].lnb_page_offset;
1028 off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1031 memset(p + off, 0, PAGE_SIZE - off);
1032 kunmap(lnb[i].lnb_page);
1036 timediff = ktime_us_delta(end, start);
1037 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1039 if (iobuf->dr_npages) {
1040 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1042 iobuf->dr_blocks, 0);
1043 if (likely(rc == 0)) {
1044 rc = osd_do_bio(osd, inode, iobuf);
1045 /* do IO stats for preparation reads */
1046 osd_fini_iobuf(osd, iobuf);
1052 struct osd_fextent {
1055 unsigned int mapped:1;
1058 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1059 struct osd_fextent *cached_extent)
1061 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1062 sector_t block = offset >> inode->i_blkbits;
1064 struct fiemap_extent_info fei = { 0 };
1065 struct fiemap_extent fe = { 0 };
1066 mm_segment_t saved_fs;
1069 if (block >= cached_extent->start && block < cached_extent->end)
1070 return cached_extent->mapped;
1072 if (i_size_read(inode) == 0)
1075 /* Beyond EOF, must not be mapped */
1076 if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1079 fei.fi_extents_max = 1;
1080 fei.fi_extents_start = &fe;
1082 saved_fs = get_fs();
1084 rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1089 start = fe.fe_logical >> inode->i_blkbits;
1091 if (start > block) {
1092 cached_extent->start = block;
1093 cached_extent->end = start;
1094 cached_extent->mapped = 0;
1096 cached_extent->start = start;
1097 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1099 cached_extent->mapped = 1;
1102 return cached_extent->mapped;
1105 static int osd_declare_write_commit(const struct lu_env *env,
1106 struct dt_object *dt,
1107 struct niobuf_local *lnb, int npages,
1108 struct thandle *handle)
1110 const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1111 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1112 struct osd_thandle *oh;
1120 long long quota_space = 0;
1121 struct osd_fextent extent = { 0 };
1122 enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1125 LASSERT(handle != NULL);
1126 oh = container_of0(handle, struct osd_thandle, ot_super);
1127 LASSERT(oh->ot_handle == NULL);
1131 /* calculate number of extents (probably better to pass nb) */
1132 for (i = 0; i < npages; i++) {
1133 if (i && lnb[i].lnb_file_offset !=
1134 lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1137 if (!osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent))
1138 quota_space += PAGE_SIZE;
1140 /* ignore quota for the whole request if any page is from
1141 * client cache or written by root.
1143 * XXX once we drop the 1.8 client support, the checking
1144 * for whether page is from cache can be simplified as:
1145 * !(lnb[i].flags & OBD_BRW_SYNC)
1147 * XXX we could handle this on per-lnb basis as done by
1149 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1150 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1152 declare_flags |= OSD_QID_FORCE;
1156 * each extent can go into new leaf causing a split
1157 * 5 is max tree depth: inode + 4 index blocks
1158 * with blockmaps, depth is 3 at most
1160 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1162 * many concurrent threads may grow tree by the time
1163 * our transaction starts. so, consider 2 is a min depth
1165 depth = ext_depth(inode);
1166 depth = max(depth, 1) + 1;
1168 credits++; /* inode */
1169 credits += depth * 2 * extents;
1173 credits++; /* inode */
1174 credits += depth * extents;
1177 /* quota space for metadata blocks */
1178 quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1180 /* quota space should be reported in 1K blocks */
1181 quota_space = toqb(quota_space);
1183 /* each new block can go in different group (bitmap + gd) */
1185 /* we can't dirty more bitmap blocks than exist */
1186 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1187 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1189 credits += newblocks;
1191 /* we can't dirty more gd blocks than exist */
1192 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1193 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1195 credits += newblocks;
1197 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1199 /* make sure the over quota flags were not set */
1200 lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1202 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1203 i_projid_read(inode), quota_space, oh,
1204 osd_dt_obj(dt), &flags, declare_flags);
1206 /* we need only to store the overquota flags in the first lnb for
1207 * now, once we support multiple objects BRW, this code needs be
1209 if (flags & QUOTA_FL_OVER_USRQUOTA)
1210 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1211 if (flags & QUOTA_FL_OVER_GRPQUOTA)
1212 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1213 if (flags & QUOTA_FL_OVER_PRJQUOTA)
1214 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1219 /* Check if a block is allocated or not */
1220 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1221 struct niobuf_local *lnb, int npages,
1222 struct thandle *thandle)
1224 struct osd_thread_info *oti = osd_oti_get(env);
1225 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1226 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1227 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1230 struct osd_fextent extent = { 0 };
1234 rc = osd_init_iobuf(osd, iobuf, 1, npages);
1235 if (unlikely(rc != 0))
1238 isize = i_size_read(inode);
1239 ll_vfs_dq_init(inode);
1241 for (i = 0; i < npages; i++) {
1242 if (lnb[i].lnb_rc == -ENOSPC &&
1243 osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent)) {
1244 /* Allow the write to proceed if overwriting an
1249 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1250 CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1252 LASSERT(lnb[i].lnb_page);
1253 generic_error_remove_page(inode->i_mapping,
1258 LASSERT(PageLocked(lnb[i].lnb_page));
1259 LASSERT(!PageWriteback(lnb[i].lnb_page));
1261 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1262 isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1265 * Since write and truncate are serialized by oo_sem, even
1266 * partial-page truncate should not leave dirty pages in the
1269 LASSERT(!PageDirty(lnb[i].lnb_page));
1271 SetPageUptodate(lnb[i].lnb_page);
1273 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1276 osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1278 if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1280 } else if (iobuf->dr_npages > 0) {
1281 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1283 iobuf->dr_blocks, 1);
1285 /* no pages to write, no transno is needed */
1286 thandle->th_local = 1;
1289 if (likely(rc == 0)) {
1290 spin_lock(&inode->i_lock);
1291 if (isize > i_size_read(inode)) {
1292 i_size_write(inode, isize);
1293 LDISKFS_I(inode)->i_disksize = isize;
1294 spin_unlock(&inode->i_lock);
1295 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1297 spin_unlock(&inode->i_lock);
1300 rc = osd_do_bio(osd, inode, iobuf);
1301 /* we don't do stats here as in read path because
1302 * write is async: we'll do this in osd_put_bufs() */
1304 osd_fini_iobuf(osd, iobuf);
1307 osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1309 if (unlikely(rc != 0)) {
1310 /* if write fails, we should drop pages from the cache */
1311 for (i = 0; i < npages; i++) {
1312 if (lnb[i].lnb_page == NULL)
1314 LASSERT(PageLocked(lnb[i].lnb_page));
1315 generic_error_remove_page(inode->i_mapping,
1323 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1324 struct niobuf_local *lnb, int npages)
1326 struct osd_thread_info *oti = osd_oti_get(env);
1327 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1328 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1329 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1330 int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0;
1337 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1338 if (unlikely(rc != 0))
1341 isize = i_size_read(inode);
1343 if (osd->od_read_cache)
1345 if (isize > osd->od_readcache_max_filesize)
1348 start = ktime_get();
1349 for (i = 0; i < npages; i++) {
1351 if (isize <= lnb[i].lnb_file_offset)
1352 /* If there's no more data, abort early.
1353 * lnb->lnb_rc == 0, so it's easy to detect later. */
1356 if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len)
1357 lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset;
1359 lnb[i].lnb_rc = lnb[i].lnb_len;
1361 /* Bypass disk read if fail_loc is set properly */
1362 if (OBD_FAIL_CHECK(OBD_FAIL_OST_FAKE_RW))
1363 SetPageUptodate(lnb[i].lnb_page);
1365 if (PageUptodate(lnb[i].lnb_page)) {
1369 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1373 generic_error_remove_page(inode->i_mapping,
1377 timediff = ktime_us_delta(end, start);
1378 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1380 if (cache_hits != 0)
1381 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1383 if (cache_misses != 0)
1384 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1386 if (cache_hits + cache_misses != 0)
1387 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1388 cache_hits + cache_misses);
1390 if (iobuf->dr_npages) {
1391 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1393 iobuf->dr_blocks, 0);
1394 rc = osd_do_bio(osd, inode, iobuf);
1396 /* IO stats will be done in osd_bufs_put() */
1403 * XXX: Another layering violation for now.
1405 * We don't want to use ->f_op->read methods, because generic file write
1407 * - serializes on ->i_sem, and
1409 * - does a lot of extra work like balance_dirty_pages(),
1411 * which doesn't work for globally shared files like /last_rcvd.
1413 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1415 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1417 memcpy(buffer, (char *)ei->i_data, buflen);
1422 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1424 struct buffer_head *bh;
1425 unsigned long block;
1431 /* prevent reading after eof */
1432 spin_lock(&inode->i_lock);
1433 if (i_size_read(inode) < *offs + size) {
1434 loff_t diff = i_size_read(inode) - *offs;
1435 spin_unlock(&inode->i_lock);
1437 CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1438 i_size_read(inode), *offs);
1440 } else if (diff == 0) {
1446 spin_unlock(&inode->i_lock);
1449 blocksize = 1 << inode->i_blkbits;
1452 block = *offs >> inode->i_blkbits;
1453 boffs = *offs & (blocksize - 1);
1454 csize = min(blocksize - boffs, size);
1455 bh = __ldiskfs_bread(NULL, inode, block, 0);
1457 CERROR("%s: can't read %u@%llu on ino %lu: "
1458 "rc = %ld\n", osd_ino2name(inode),
1459 csize, *offs, inode->i_ino,
1465 memcpy(buf, bh->b_data + boffs, csize);
1468 memset(buf, 0, csize);
1478 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1479 struct lu_buf *buf, loff_t *pos)
1481 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1484 /* Read small symlink from inode body as we need to maintain correct
1485 * on-disk symlinks for ldiskfs.
1487 if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1488 (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1489 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1491 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1496 static inline int osd_extents_enabled(struct super_block *sb,
1497 struct inode *inode)
1499 if (inode != NULL) {
1500 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1502 } else if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
1503 LDISKFS_FEATURE_INCOMPAT_EXTENTS)) {
1509 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1510 const loff_t size, const loff_t pos,
1513 int credits, bits, bs, i;
1515 bits = sb->s_blocksize_bits;
1518 /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1519 * we do not expect blockmaps on the large files,
1520 * so let's shrink it to 2 levels (4GB files) */
1522 /* this is default reservation: 2 levels */
1523 credits = (blocks + 2) * 3;
1525 /* actual offset is unknown, hard to optimize */
1529 /* now check for few specific cases to optimize */
1530 if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1533 /* allocate if not allocated */
1534 if (inode == NULL) {
1535 credits += blocks * 2;
1538 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1539 LASSERT(i < LDISKFS_NDIR_BLOCKS);
1540 if (LDISKFS_I(inode)->i_data[i] == 0)
1543 } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1544 /* single indirect */
1545 credits = blocks * 3;
1546 if (inode == NULL ||
1547 LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1550 /* The indirect block may be modified. */
1557 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1558 const struct lu_buf *buf, loff_t _pos,
1559 struct thandle *handle)
1561 struct osd_object *obj = osd_dt_obj(dt);
1562 struct inode *inode = obj->oo_inode;
1563 struct super_block *sb = osd_sb(osd_obj2dev(obj));
1564 struct osd_thandle *oh;
1565 int rc = 0, est = 0, credits, blocks, allocated = 0;
1571 LASSERT(buf != NULL);
1572 LASSERT(handle != NULL);
1574 oh = container_of0(handle, struct osd_thandle, ot_super);
1575 LASSERT(oh->ot_handle == NULL);
1578 bits = sb->s_blocksize_bits;
1582 /* if this is an append, then we
1583 * should expect cross-block record */
1589 /* blocks to modify */
1590 blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1591 LASSERT(blocks > 0);
1593 if (inode != NULL && _pos != -1) {
1594 /* object size in blocks */
1595 est = (i_size_read(inode) + bs - 1) >> bits;
1596 allocated = inode->i_blocks >> (bits - 9);
1597 if (pos + size <= i_size_read(inode) && est <= allocated) {
1598 /* looks like an overwrite, no need to modify tree */
1600 /* no need to modify i_size */
1605 if (osd_extents_enabled(sb, inode)) {
1607 * many concurrent threads may grow tree by the time
1608 * our transaction starts. so, consider 2 is a min depth
1609 * for every level we may need to allocate a new block
1610 * and take some entries from the old one. so, 3 blocks
1611 * to allocate (bitmap, gd, itself) + old block - 4 per
1614 depth = inode != NULL ? ext_depth(inode) : 0;
1615 depth = max(depth, 1) + 1;
1617 /* if not append, then split may need to modify
1618 * existing blocks moving entries into the new ones */
1621 /* blocks to store data: bitmap,gd,itself */
1622 credits += blocks * 3;
1624 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1626 /* if inode is created as part of the transaction,
1627 * then it's counted already by the creation method */
1633 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1635 /* dt_declare_write() is usually called for system objects, such
1636 * as llog or last_rcvd files. We needn't enforce quota on those
1637 * objects, so always set the lqi_space as 0. */
1639 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1641 i_projid_read(inode), 0,
1642 oh, obj, NULL, OSD_QID_BLK);
1646 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1648 /* LU-2634: clear the extent format for fast symlink */
1649 ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1651 memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1652 spin_lock(&inode->i_lock);
1653 LDISKFS_I(inode)->i_disksize = buflen;
1654 i_size_write(inode, buflen);
1655 spin_unlock(&inode->i_lock);
1656 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1661 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1662 int write_NUL, loff_t *offs, handle_t *handle)
1664 struct buffer_head *bh = NULL;
1665 loff_t offset = *offs;
1666 loff_t new_size = i_size_read(inode);
1667 unsigned long block;
1668 int blocksize = 1 << inode->i_blkbits;
1672 int dirty_inode = 0;
1676 * long symlink write does not count the NUL terminator in
1677 * bufsize, we write it, and the inode's file size does not
1678 * count the NUL terminator as well.
1680 ((char *)buf)[bufsize] = '\0';
1684 while (bufsize > 0) {
1685 int credits = handle->h_buffer_credits;
1690 block = offset >> inode->i_blkbits;
1691 boffs = offset & (blocksize - 1);
1692 size = min(blocksize - boffs, bufsize);
1693 bh = __ldiskfs_bread(handle, inode, block, 1);
1694 if (IS_ERR_OR_NULL(bh)) {
1702 CERROR("%s: error reading offset %llu (block %lu, "
1703 "size %d, offs %llu), credits %d/%d: rc = %d\n",
1704 inode->i_sb->s_id, offset, block, bufsize, *offs,
1705 credits, handle->h_buffer_credits, err);
1709 err = ldiskfs_journal_get_write_access(handle, bh);
1711 CERROR("journal_get_write_access() returned error %d\n",
1715 LASSERTF(boffs + size <= bh->b_size,
1716 "boffs %d size %d bh->b_size %lu\n",
1717 boffs, size, (unsigned long)bh->b_size);
1718 memcpy(bh->b_data + boffs, buf, size);
1719 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
1723 if (offset + size > new_size)
1724 new_size = offset + size;
1734 /* correct in-core and on-disk sizes */
1735 if (new_size > i_size_read(inode)) {
1736 spin_lock(&inode->i_lock);
1737 if (new_size > i_size_read(inode))
1738 i_size_write(inode, new_size);
1739 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1740 LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1743 spin_unlock(&inode->i_lock);
1745 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1753 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1754 const struct lu_buf *buf, loff_t *pos,
1755 struct thandle *handle, int ignore_quota)
1757 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1758 struct osd_thandle *oh;
1762 LASSERT(dt_object_exists(dt));
1764 LASSERT(handle != NULL);
1765 LASSERT(inode != NULL);
1766 ll_vfs_dq_init(inode);
1768 /* XXX: don't check: one declared chunk can be used many times */
1769 /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1771 oh = container_of(handle, struct osd_thandle, ot_super);
1772 LASSERT(oh->ot_handle->h_transaction != NULL);
1773 osd_trans_exec_op(env, handle, OSD_OT_WRITE);
1775 /* Write small symlink to inode body as we need to maintain correct
1776 * on-disk symlinks for ldiskfs.
1777 * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1778 * does not count it in.
1780 is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1781 if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1782 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1784 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1785 buf->lb_len, is_link, pos,
1788 result = buf->lb_len;
1790 osd_trans_exec_check(env, handle, OSD_OT_WRITE);
1795 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1796 __u64 start, __u64 end, struct thandle *th)
1798 struct osd_thandle *oh;
1799 struct inode *inode;
1804 oh = container_of(th, struct osd_thandle, ot_super);
1807 * we don't need to reserve credits for whole truncate
1808 * it's not possible as truncate may need to free too many
1809 * blocks and that won't fit a single transaction. instead
1810 * we reserve credits to change i_size and put inode onto
1811 * orphan list. if needed truncate will extend or restart
1814 osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1815 osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1817 inode = osd_dt_obj(dt)->oo_inode;
1820 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1821 i_projid_read(inode), 0, oh, osd_dt_obj(dt),
1826 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1827 __u64 start, __u64 end, struct thandle *th)
1829 struct osd_thandle *oh;
1830 struct osd_object *obj = osd_dt_obj(dt);
1831 struct inode *inode = obj->oo_inode;
1834 int rc = 0, rc2 = 0;
1837 LASSERT(end == OBD_OBJECT_EOF);
1838 LASSERT(dt_object_exists(dt));
1839 LASSERT(osd_invariant(obj));
1840 LASSERT(inode != NULL);
1841 ll_vfs_dq_init(inode);
1844 oh = container_of(th, struct osd_thandle, ot_super);
1845 LASSERT(oh->ot_handle->h_transaction != NULL);
1847 osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1849 tid = oh->ot_handle->h_transaction->t_tid;
1851 spin_lock(&inode->i_lock);
1852 i_size_write(inode, start);
1853 spin_unlock(&inode->i_lock);
1854 ll_truncate_pagecache(inode, start);
1855 #ifdef HAVE_INODEOPS_TRUNCATE
1856 if (inode->i_op->truncate) {
1857 inode->i_op->truncate(inode);
1860 ldiskfs_truncate(inode);
1863 * For a partial-page truncate, flush the page to disk immediately to
1864 * avoid data corruption during direct disk write. b=17397
1866 if ((start & ~PAGE_MASK) != 0)
1867 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1869 h = journal_current_handle();
1871 LASSERT(h == oh->ot_handle);
1873 /* do not check credits with osd_trans_exec_check() as the truncate
1874 * can restart the transaction internally and we restart the
1875 * transaction in this case */
1877 if (tid != h->h_transaction->t_tid) {
1878 int credits = oh->ot_credits;
1880 * transaction has changed during truncate
1881 * we need to restart the handle with our credits
1883 if (h->h_buffer_credits < credits) {
1884 if (ldiskfs_journal_extend(h, credits))
1885 rc2 = ldiskfs_journal_restart(h, credits);
1889 RETURN(rc == 0 ? rc2 : rc);
1892 static int fiemap_check_ranges(struct inode *inode,
1893 u64 start, u64 len, u64 *new_len)
1902 if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
1903 maxbytes = inode->i_sb->s_maxbytes;
1905 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
1907 if (start > maxbytes)
1911 * Shrink request scope to what the fs can actually handle.
1913 if (len > maxbytes || (maxbytes - len) < start)
1914 *new_len = maxbytes - start;
1919 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1920 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
1922 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1925 struct fiemap_extent_info fieinfo = {0, };
1926 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1932 if (inode->i_op->fiemap == NULL)
1935 if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
1938 rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
1942 fieinfo.fi_flags = fm->fm_flags;
1943 fieinfo.fi_extents_max = fm->fm_extent_count;
1944 fieinfo.fi_extents_start = fm->fm_extents;
1946 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
1947 filemap_write_and_wait(inode->i_mapping);
1949 rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
1950 fm->fm_flags = fieinfo.fi_flags;
1951 fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
1956 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
1957 __u64 start, __u64 end, enum lu_ladvise_type advice)
1960 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1964 case LU_LADVISE_DONTNEED:
1967 invalidate_mapping_pages(inode->i_mapping,
1968 start >> PAGE_CACHE_SHIFT,
1969 (end - 1) >> PAGE_CACHE_SHIFT);
1980 * in some cases we may need declare methods for objects being created
1981 * e.g., when we create symlink
1983 const struct dt_body_operations osd_body_ops_new = {
1984 .dbo_declare_write = osd_declare_write,
1987 const struct dt_body_operations osd_body_ops = {
1988 .dbo_read = osd_read,
1989 .dbo_declare_write = osd_declare_write,
1990 .dbo_write = osd_write,
1991 .dbo_bufs_get = osd_bufs_get,
1992 .dbo_bufs_put = osd_bufs_put,
1993 .dbo_write_prep = osd_write_prep,
1994 .dbo_declare_write_commit = osd_declare_write_commit,
1995 .dbo_write_commit = osd_write_commit,
1996 .dbo_read_prep = osd_read_prep,
1997 .dbo_declare_punch = osd_declare_punch,
1998 .dbo_punch = osd_punch,
1999 .dbo_fiemap_get = osd_fiemap_get,
2000 .dbo_ladvise = osd_ladvise,