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,
427 struct inode *inode = osd_dt_obj(dt)->oo_inode;
428 struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
433 page = find_or_create_page(inode->i_mapping, offset >> PAGE_SHIFT,
436 if (unlikely(page == NULL))
437 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
443 * there are following "locks":
454 * - lock pages, unlock
456 * - lock partial page
462 * Unlock and release pages loaded by osd_bufs_get()
464 * Unlock \a npages pages from \a lnb and drop the refcount on them.
466 * \param env thread execution environment
467 * \param dt dt object undergoing IO (OSD object + methods)
468 * \param lnb array of pages undergoing IO
469 * \param npages number of pages in \a lnb
473 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
474 struct niobuf_local *lnb, int npages)
478 for (i = 0; i < npages; i++) {
479 if (lnb[i].lnb_page == NULL)
481 LASSERT(PageLocked(lnb[i].lnb_page));
482 unlock_page(lnb[i].lnb_page);
483 put_page(lnb[i].lnb_page);
484 dt_object_put(env, dt);
485 lnb[i].lnb_page = NULL;
492 * Load and lock pages undergoing IO
494 * Pages as described in the \a lnb array are fetched (from disk or cache)
495 * and locked for IO by the caller.
497 * DLM locking protects us from write and truncate competing for same region,
498 * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
499 * It's possible the writeout on a such a page is in progress when we access
500 * it. It's also possible that during this writeout we put new (partial) data
501 * into the page, but won't be able to proceed in filter_commitrw_write().
502 * Therefore, just wait for writeout completion as it should be rare enough.
504 * \param env thread execution environment
505 * \param dt dt object undergoing IO (OSD object + methods)
506 * \param pos byte offset of IO start
507 * \param len number of bytes of IO
508 * \param lnb array of extents undergoing IO
509 * \param rw read or write operation, and other flags
510 * \param capa capabilities
512 * \retval pages (zero or more) loaded successfully
513 * \retval -ENOMEM on memory/page allocation error
515 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
516 loff_t pos, ssize_t len, struct niobuf_local *lnb,
517 enum dt_bufs_type rw)
519 struct osd_object *obj = osd_dt_obj(dt);
520 int npages, i, rc = 0;
523 LASSERT(obj->oo_inode);
525 osd_map_remote_to_local(pos, len, &npages, lnb);
527 /* this could also try less hard for DT_BUFS_TYPE_READAHEAD pages */
528 gfp_mask = rw & DT_BUFS_TYPE_LOCAL ? (GFP_NOFS | __GFP_HIGHMEM) :
530 for (i = 0; i < npages; i++, lnb++) {
531 lnb->lnb_page = osd_get_page(dt, lnb->lnb_file_offset,
533 if (lnb->lnb_page == NULL)
534 GOTO(cleanup, rc = -ENOMEM);
536 wait_on_page_writeback(lnb->lnb_page);
537 BUG_ON(PageWriteback(lnb->lnb_page));
539 lu_object_get(&dt->do_lu);
546 osd_bufs_put(env, dt, lnb - i, i);
550 #ifndef HAVE_LDISKFS_MAP_BLOCKS
552 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
553 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
564 static long ldiskfs_ext_find_goal(struct inode *inode,
565 struct ldiskfs_ext_path *path,
566 unsigned long block, int *aflags)
568 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
569 unsigned long bg_start;
570 unsigned long colour;
574 struct ldiskfs_extent *ex;
575 depth = path->p_depth;
577 /* try to predict block placement */
578 if ((ex = path[depth].p_ext))
579 return ldiskfs_ext_pblock(ex) +
580 (block - le32_to_cpu(ex->ee_block));
582 /* it looks index is empty
583 * try to find starting from index itself */
584 if (path[depth].p_bh)
585 return path[depth].p_bh->b_blocknr;
588 /* OK. use inode's group */
589 bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
590 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
591 colour = (current->pid % 16) *
592 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
593 return bg_start + colour + block;
596 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
597 struct ldiskfs_ext_path *path,
598 unsigned long block, unsigned long *count,
601 struct ldiskfs_allocation_request ar;
602 unsigned long pblock;
605 /* find neighbour allocated blocks */
607 *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
611 *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
615 /* allocate new block */
616 ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
620 ar.flags = LDISKFS_MB_HINT_DATA;
621 pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
626 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
627 struct ldiskfs_ext_path *path,
628 struct ldiskfs_ext_cache *cex,
629 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
630 struct ldiskfs_extent *ex,
634 struct bpointers *bp = cbdata;
635 struct ldiskfs_extent nex;
636 unsigned long pblock = 0;
642 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
643 if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
645 if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
651 if (bp->create == 0) {
653 if (cex->ec_block < bp->start)
654 i = bp->start - cex->ec_block;
655 if (i >= cex->ec_len)
656 CERROR("nothing to do?! i = %d, e_num = %u\n",
658 for (; i < cex->ec_len && bp->num; i++) {
668 tgen = LDISKFS_I(inode)->i_ext_generation;
669 count = ldiskfs_ext_calc_credits_for_insert(inode, path);
671 handle = osd_journal_start(inode, LDISKFS_HT_MISC,
672 count + LDISKFS_ALLOC_NEEDED + 1);
673 if (IS_ERR(handle)) {
674 return PTR_ERR(handle);
677 if (tgen != LDISKFS_I(inode)->i_ext_generation) {
678 /* the tree has changed. so path can be invalid at moment */
679 ldiskfs_journal_stop(handle);
683 /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
684 * protected by i_data_sem as whole. so we patch it to store
685 * generation to path and now verify the tree hasn't changed */
686 down_write((&LDISKFS_I(inode)->i_data_sem));
688 /* validate extent, make sure the extent tree does not changed */
689 if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
690 /* cex is invalid, try again */
691 up_write(&LDISKFS_I(inode)->i_data_sem);
692 ldiskfs_journal_stop(handle);
697 pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
700 BUG_ON(count > cex->ec_len);
702 /* insert new extent */
703 nex.ee_block = cpu_to_le32(cex->ec_block);
704 ldiskfs_ext_store_pblock(&nex, pblock);
705 nex.ee_len = cpu_to_le16(count);
706 err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
708 /* free data blocks we just allocated */
709 /* not a good idea to call discard here directly,
710 * but otherwise we'd need to call it every free() */
711 ldiskfs_discard_preallocations(inode);
712 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
713 ldiskfs_free_blocks(handle, inode, NULL,
714 ldiskfs_ext_pblock(&nex),
715 le16_to_cpu(nex.ee_len), 0);
717 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
718 le16_to_cpu(nex.ee_len), 0);
724 * Putting len of the actual extent we just inserted,
725 * we are asking ldiskfs_ext_walk_space() to continue
726 * scaning after that block
728 cex->ec_len = le16_to_cpu(nex.ee_len);
729 cex->ec_start = ldiskfs_ext_pblock(&nex);
730 BUG_ON(le16_to_cpu(nex.ee_len) == 0);
731 BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
734 up_write((&LDISKFS_I(inode)->i_data_sem));
735 ldiskfs_journal_stop(handle);
740 CERROR("hmm. why do we find this extent?\n");
741 CERROR("initial space: %lu:%u\n",
742 bp->start, bp->init_num);
743 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
744 CERROR("current extent: %u/%u/%llu %d\n",
745 cex->ec_block, cex->ec_len,
746 (unsigned long long)cex->ec_start,
749 CERROR("current extent: %u/%u/%llu\n",
750 cex->ec_block, cex->ec_len,
751 (unsigned long long)cex->ec_start);
755 if (cex->ec_block < bp->start)
756 i = bp->start - cex->ec_block;
757 if (i >= cex->ec_len)
758 CERROR("nothing to do?! i = %d, e_num = %u\n",
760 for (; i < cex->ec_len && bp->num; i++) {
761 *(bp->blocks) = cex->ec_start + i;
763 /* unmap any possible underlying metadata from
764 * the block device mapping. bug 6998. */
765 unmap_underlying_metadata(inode->i_sb->s_bdev,
776 static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
777 int clen, sector_t *blocks, int create)
779 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
783 if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
787 bp.start = index * blocks_per_page;
788 bp.init_num = bp.num = clen * blocks_per_page;
791 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
792 bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
794 err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
795 ldiskfs_ext_new_extent_cb, &bp);
796 ldiskfs_ext_invalidate_cache(inode);
801 static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
802 struct page **page, int pages,
803 sector_t *blocks, int create)
805 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
806 pgoff_t bitmap_max_page_index;
810 bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
812 for (i = 0, b = blocks; i < pages; i++, page++) {
813 if ((*page)->index + 1 >= bitmap_max_page_index) {
817 rc = ldiskfs_map_inode_page(inode, *page, b, create);
819 CERROR("ino %lu, blk %llu create %d: rc %d\n",
821 (unsigned long long)*b, create, rc);
824 b += blocks_per_page;
829 static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
831 int pages, sector_t *blocks,
834 int rc = 0, i = 0, clen = 0;
835 struct page *fp = NULL;
837 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
838 inode->i_ino, pages, (*page)->index);
840 /* pages are sorted already. so, we just have to find
841 * contig. space and process them properly */
844 /* start new extent */
849 } else if (fp->index + clen == (*page)->index) {
850 /* continue the extent */
857 /* process found extent */
858 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
863 /* look for next extent */
865 blocks += clen * (PAGE_SIZE >> inode->i_blkbits);
869 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
876 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
877 int pages, sector_t *blocks,
882 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
883 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
887 rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
892 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
893 int pages, sector_t *blocks,
896 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
898 struct page *fp = NULL;
900 pgoff_t max_page_index;
901 handle_t *handle = NULL;
903 max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
905 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
906 inode->i_ino, pages, (*page)->index);
909 create = LDISKFS_GET_BLOCKS_CREATE;
910 handle = ldiskfs_journal_current_handle();
911 LASSERT(handle != NULL);
912 rc = osd_attach_jinode(inode);
916 /* pages are sorted already. so, we just have to find
917 * contig. space and process them properly */
919 long blen, total = 0;
920 struct ldiskfs_map_blocks map = { 0 };
922 if (fp == NULL) { /* start new extent */
927 } else if (fp->index + clen == (*page)->index) {
928 /* continue the extent */
934 if (fp->index + clen >= max_page_index)
935 GOTO(cleanup, rc = -EFBIG);
936 /* process found extent */
937 map.m_lblk = fp->index * blocks_per_page;
938 map.m_len = blen = clen * blocks_per_page;
940 rc = ldiskfs_map_blocks(handle, inode, &map, create);
943 for (; total < blen && c < map.m_len; c++, total++) {
945 *(blocks + total) = 0;
949 *(blocks + total) = map.m_pblk + c;
950 /* unmap any possible underlying
951 * metadata from the block device
952 * mapping. bug 6998. */
953 if ((map.m_flags & LDISKFS_MAP_NEW) &&
955 unmap_underlying_metadata(
962 if (rc == 0 && total < blen) {
963 map.m_lblk = fp->index * blocks_per_page + total;
964 map.m_len = blen - total;
970 /* look for next extent */
972 blocks += blocks_per_page * clen;
977 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
979 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
980 struct niobuf_local *lnb, int npages)
982 struct osd_thread_info *oti = osd_oti_get(env);
983 struct osd_iobuf *iobuf = &oti->oti_iobuf;
984 struct inode *inode = osd_dt_obj(dt)->oo_inode;
985 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
997 rc = osd_init_iobuf(osd, iobuf, 0, npages);
998 if (unlikely(rc != 0))
1001 isize = i_size_read(inode);
1002 maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
1004 if (osd->od_writethrough_cache)
1006 if (isize > osd->od_readcache_max_filesize)
1009 start = ktime_get();
1010 for (i = 0; i < npages; i++) {
1013 generic_error_remove_page(inode->i_mapping,
1017 * till commit the content of the page is undefined
1018 * we'll set it uptodate once bulk is done. otherwise
1019 * subsequent reads can access non-stable data
1021 ClearPageUptodate(lnb[i].lnb_page);
1023 if (lnb[i].lnb_len == PAGE_SIZE)
1026 if (maxidx >= lnb[i].lnb_page->index) {
1027 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1030 char *p = kmap(lnb[i].lnb_page);
1032 off = lnb[i].lnb_page_offset;
1035 off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1038 memset(p + off, 0, PAGE_SIZE - off);
1039 kunmap(lnb[i].lnb_page);
1043 timediff = ktime_us_delta(end, start);
1044 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1046 if (iobuf->dr_npages) {
1047 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1049 iobuf->dr_blocks, 0);
1050 if (likely(rc == 0)) {
1051 rc = osd_do_bio(osd, inode, iobuf);
1052 /* do IO stats for preparation reads */
1053 osd_fini_iobuf(osd, iobuf);
1059 struct osd_fextent {
1062 unsigned int mapped:1;
1065 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1066 struct osd_fextent *cached_extent)
1068 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1069 sector_t block = offset >> inode->i_blkbits;
1071 struct fiemap_extent_info fei = { 0 };
1072 struct fiemap_extent fe = { 0 };
1073 mm_segment_t saved_fs;
1076 if (block >= cached_extent->start && block < cached_extent->end)
1077 return cached_extent->mapped;
1079 if (i_size_read(inode) == 0)
1082 /* Beyond EOF, must not be mapped */
1083 if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1086 fei.fi_extents_max = 1;
1087 fei.fi_extents_start = &fe;
1089 saved_fs = get_fs();
1091 rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1096 start = fe.fe_logical >> inode->i_blkbits;
1098 if (start > block) {
1099 cached_extent->start = block;
1100 cached_extent->end = start;
1101 cached_extent->mapped = 0;
1103 cached_extent->start = start;
1104 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1106 cached_extent->mapped = 1;
1109 return cached_extent->mapped;
1112 static int osd_declare_write_commit(const struct lu_env *env,
1113 struct dt_object *dt,
1114 struct niobuf_local *lnb, int npages,
1115 struct thandle *handle)
1117 const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1118 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1119 struct osd_thandle *oh;
1127 long long quota_space = 0;
1128 struct osd_fextent extent = { 0 };
1129 enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
1132 LASSERT(handle != NULL);
1133 oh = container_of0(handle, struct osd_thandle, ot_super);
1134 LASSERT(oh->ot_handle == NULL);
1138 /* calculate number of extents (probably better to pass nb) */
1139 for (i = 0; i < npages; i++) {
1140 if (i && lnb[i].lnb_file_offset !=
1141 lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1144 if (!osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent))
1145 quota_space += PAGE_SIZE;
1147 /* ignore quota for the whole request if any page is from
1148 * client cache or written by root.
1150 * XXX once we drop the 1.8 client support, the checking
1151 * for whether page is from cache can be simplified as:
1152 * !(lnb[i].flags & OBD_BRW_SYNC)
1154 * XXX we could handle this on per-lnb basis as done by
1156 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1157 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1159 declare_flags |= OSD_QID_FORCE;
1163 * each extent can go into new leaf causing a split
1164 * 5 is max tree depth: inode + 4 index blocks
1165 * with blockmaps, depth is 3 at most
1167 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1169 * many concurrent threads may grow tree by the time
1170 * our transaction starts. so, consider 2 is a min depth
1172 depth = ext_depth(inode);
1173 depth = max(depth, 1) + 1;
1175 credits++; /* inode */
1176 credits += depth * 2 * extents;
1180 credits++; /* inode */
1181 credits += depth * extents;
1184 /* quota space for metadata blocks */
1185 quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1187 /* quota space should be reported in 1K blocks */
1188 quota_space = toqb(quota_space);
1190 /* each new block can go in different group (bitmap + gd) */
1192 /* we can't dirty more bitmap blocks than exist */
1193 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1194 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1196 credits += newblocks;
1198 /* we can't dirty more gd blocks than exist */
1199 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1200 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1202 credits += newblocks;
1204 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1206 /* make sure the over quota flags were not set */
1207 lnb[0].lnb_flags &= ~OBD_BRW_OVER_ALLQUOTA;
1209 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1210 i_projid_read(inode), quota_space, oh,
1211 osd_dt_obj(dt), &flags, declare_flags);
1213 /* we need only to store the overquota flags in the first lnb for
1214 * now, once we support multiple objects BRW, this code needs be
1216 if (flags & QUOTA_FL_OVER_USRQUOTA)
1217 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1218 if (flags & QUOTA_FL_OVER_GRPQUOTA)
1219 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1220 if (flags & QUOTA_FL_OVER_PRJQUOTA)
1221 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
1226 /* Check if a block is allocated or not */
1227 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1228 struct niobuf_local *lnb, int npages,
1229 struct thandle *thandle)
1231 struct osd_thread_info *oti = osd_oti_get(env);
1232 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1233 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1234 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1237 struct osd_fextent extent = { 0 };
1241 rc = osd_init_iobuf(osd, iobuf, 1, npages);
1242 if (unlikely(rc != 0))
1245 isize = i_size_read(inode);
1246 ll_vfs_dq_init(inode);
1248 for (i = 0; i < npages; i++) {
1249 if (lnb[i].lnb_rc == -ENOSPC &&
1250 osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent)) {
1251 /* Allow the write to proceed if overwriting an
1256 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1257 CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1259 LASSERT(lnb[i].lnb_page);
1260 generic_error_remove_page(inode->i_mapping,
1265 LASSERT(PageLocked(lnb[i].lnb_page));
1266 LASSERT(!PageWriteback(lnb[i].lnb_page));
1268 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1269 isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1272 * Since write and truncate are serialized by oo_sem, even
1273 * partial-page truncate should not leave dirty pages in the
1276 LASSERT(!PageDirty(lnb[i].lnb_page));
1278 SetPageUptodate(lnb[i].lnb_page);
1280 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1283 osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1285 if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1287 } else if (iobuf->dr_npages > 0) {
1288 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1290 iobuf->dr_blocks, 1);
1292 /* no pages to write, no transno is needed */
1293 thandle->th_local = 1;
1296 if (likely(rc == 0)) {
1297 spin_lock(&inode->i_lock);
1298 if (isize > i_size_read(inode)) {
1299 i_size_write(inode, isize);
1300 LDISKFS_I(inode)->i_disksize = isize;
1301 spin_unlock(&inode->i_lock);
1302 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1304 spin_unlock(&inode->i_lock);
1307 rc = osd_do_bio(osd, inode, iobuf);
1308 /* we don't do stats here as in read path because
1309 * write is async: we'll do this in osd_put_bufs() */
1311 osd_fini_iobuf(osd, iobuf);
1314 osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1316 if (unlikely(rc != 0)) {
1317 /* if write fails, we should drop pages from the cache */
1318 for (i = 0; i < npages; i++) {
1319 if (lnb[i].lnb_page == NULL)
1321 LASSERT(PageLocked(lnb[i].lnb_page));
1322 generic_error_remove_page(inode->i_mapping,
1330 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1331 struct niobuf_local *lnb, int npages)
1333 struct osd_thread_info *oti = osd_oti_get(env);
1334 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1335 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1336 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1337 int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0;
1344 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1345 if (unlikely(rc != 0))
1348 isize = i_size_read(inode);
1350 if (osd->od_read_cache)
1352 if (isize > osd->od_readcache_max_filesize)
1355 start = ktime_get();
1356 for (i = 0; i < npages; i++) {
1358 if (isize <= lnb[i].lnb_file_offset)
1359 /* If there's no more data, abort early.
1360 * lnb->lnb_rc == 0, so it's easy to detect later. */
1363 if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len)
1364 lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset;
1366 lnb[i].lnb_rc = lnb[i].lnb_len;
1368 /* Bypass disk read if fail_loc is set properly */
1369 if (OBD_FAIL_CHECK(OBD_FAIL_OST_FAKE_RW))
1370 SetPageUptodate(lnb[i].lnb_page);
1372 if (PageUptodate(lnb[i].lnb_page)) {
1376 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1380 generic_error_remove_page(inode->i_mapping,
1384 timediff = ktime_us_delta(end, start);
1385 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1387 if (cache_hits != 0)
1388 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1390 if (cache_misses != 0)
1391 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1393 if (cache_hits + cache_misses != 0)
1394 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1395 cache_hits + cache_misses);
1397 if (iobuf->dr_npages) {
1398 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1400 iobuf->dr_blocks, 0);
1401 rc = osd_do_bio(osd, inode, iobuf);
1403 /* IO stats will be done in osd_bufs_put() */
1410 * XXX: Another layering violation for now.
1412 * We don't want to use ->f_op->read methods, because generic file write
1414 * - serializes on ->i_sem, and
1416 * - does a lot of extra work like balance_dirty_pages(),
1418 * which doesn't work for globally shared files like /last_rcvd.
1420 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1422 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1424 memcpy(buffer, (char *)ei->i_data, buflen);
1429 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1431 struct buffer_head *bh;
1432 unsigned long block;
1438 /* prevent reading after eof */
1439 spin_lock(&inode->i_lock);
1440 if (i_size_read(inode) < *offs + size) {
1441 loff_t diff = i_size_read(inode) - *offs;
1442 spin_unlock(&inode->i_lock);
1444 CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1445 i_size_read(inode), *offs);
1447 } else if (diff == 0) {
1453 spin_unlock(&inode->i_lock);
1456 blocksize = 1 << inode->i_blkbits;
1459 block = *offs >> inode->i_blkbits;
1460 boffs = *offs & (blocksize - 1);
1461 csize = min(blocksize - boffs, size);
1462 bh = __ldiskfs_bread(NULL, inode, block, 0);
1464 CERROR("%s: can't read %u@%llu on ino %lu: "
1465 "rc = %ld\n", osd_ino2name(inode),
1466 csize, *offs, inode->i_ino,
1472 memcpy(buf, bh->b_data + boffs, csize);
1475 memset(buf, 0, csize);
1485 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1486 struct lu_buf *buf, loff_t *pos)
1488 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1491 /* Read small symlink from inode body as we need to maintain correct
1492 * on-disk symlinks for ldiskfs.
1494 if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1495 (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1496 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1498 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1503 static inline int osd_extents_enabled(struct super_block *sb,
1504 struct inode *inode)
1506 if (inode != NULL) {
1507 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1509 } else if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
1510 LDISKFS_FEATURE_INCOMPAT_EXTENTS)) {
1516 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1517 const loff_t size, const loff_t pos,
1520 int credits, bits, bs, i;
1522 bits = sb->s_blocksize_bits;
1525 /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1526 * we do not expect blockmaps on the large files,
1527 * so let's shrink it to 2 levels (4GB files) */
1529 /* this is default reservation: 2 levels */
1530 credits = (blocks + 2) * 3;
1532 /* actual offset is unknown, hard to optimize */
1536 /* now check for few specific cases to optimize */
1537 if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1540 /* allocate if not allocated */
1541 if (inode == NULL) {
1542 credits += blocks * 2;
1545 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1546 LASSERT(i < LDISKFS_NDIR_BLOCKS);
1547 if (LDISKFS_I(inode)->i_data[i] == 0)
1550 } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1551 /* single indirect */
1552 credits = blocks * 3;
1553 if (inode == NULL ||
1554 LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1557 /* The indirect block may be modified. */
1564 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1565 const struct lu_buf *buf, loff_t _pos,
1566 struct thandle *handle)
1568 struct osd_object *obj = osd_dt_obj(dt);
1569 struct inode *inode = obj->oo_inode;
1570 struct super_block *sb = osd_sb(osd_obj2dev(obj));
1571 struct osd_thandle *oh;
1572 int rc = 0, est = 0, credits, blocks, allocated = 0;
1578 LASSERT(buf != NULL);
1579 LASSERT(handle != NULL);
1581 oh = container_of0(handle, struct osd_thandle, ot_super);
1582 LASSERT(oh->ot_handle == NULL);
1585 bits = sb->s_blocksize_bits;
1589 /* if this is an append, then we
1590 * should expect cross-block record */
1596 /* blocks to modify */
1597 blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1598 LASSERT(blocks > 0);
1600 if (inode != NULL && _pos != -1) {
1601 /* object size in blocks */
1602 est = (i_size_read(inode) + bs - 1) >> bits;
1603 allocated = inode->i_blocks >> (bits - 9);
1604 if (pos + size <= i_size_read(inode) && est <= allocated) {
1605 /* looks like an overwrite, no need to modify tree */
1607 /* no need to modify i_size */
1612 if (osd_extents_enabled(sb, inode)) {
1614 * many concurrent threads may grow tree by the time
1615 * our transaction starts. so, consider 2 is a min depth
1616 * for every level we may need to allocate a new block
1617 * and take some entries from the old one. so, 3 blocks
1618 * to allocate (bitmap, gd, itself) + old block - 4 per
1621 depth = inode != NULL ? ext_depth(inode) : 0;
1622 depth = max(depth, 1) + 1;
1624 /* if not append, then split may need to modify
1625 * existing blocks moving entries into the new ones */
1628 /* blocks to store data: bitmap,gd,itself */
1629 credits += blocks * 3;
1631 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1633 /* if inode is created as part of the transaction,
1634 * then it's counted already by the creation method */
1640 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1642 /* dt_declare_write() is usually called for system objects, such
1643 * as llog or last_rcvd files. We needn't enforce quota on those
1644 * objects, so always set the lqi_space as 0. */
1646 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1648 i_projid_read(inode), 0,
1649 oh, obj, NULL, OSD_QID_BLK);
1653 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1655 /* LU-2634: clear the extent format for fast symlink */
1656 ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1658 memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1659 spin_lock(&inode->i_lock);
1660 LDISKFS_I(inode)->i_disksize = buflen;
1661 i_size_write(inode, buflen);
1662 spin_unlock(&inode->i_lock);
1663 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1668 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1669 int write_NUL, loff_t *offs, handle_t *handle)
1671 struct buffer_head *bh = NULL;
1672 loff_t offset = *offs;
1673 loff_t new_size = i_size_read(inode);
1674 unsigned long block;
1675 int blocksize = 1 << inode->i_blkbits;
1679 int dirty_inode = 0;
1683 * long symlink write does not count the NUL terminator in
1684 * bufsize, we write it, and the inode's file size does not
1685 * count the NUL terminator as well.
1687 ((char *)buf)[bufsize] = '\0';
1691 while (bufsize > 0) {
1692 int credits = handle->h_buffer_credits;
1697 block = offset >> inode->i_blkbits;
1698 boffs = offset & (blocksize - 1);
1699 size = min(blocksize - boffs, bufsize);
1700 bh = __ldiskfs_bread(handle, inode, block, 1);
1701 if (IS_ERR_OR_NULL(bh)) {
1709 CERROR("%s: error reading offset %llu (block %lu, "
1710 "size %d, offs %llu), credits %d/%d: rc = %d\n",
1711 inode->i_sb->s_id, offset, block, bufsize, *offs,
1712 credits, handle->h_buffer_credits, err);
1716 err = ldiskfs_journal_get_write_access(handle, bh);
1718 CERROR("journal_get_write_access() returned error %d\n",
1722 LASSERTF(boffs + size <= bh->b_size,
1723 "boffs %d size %d bh->b_size %lu\n",
1724 boffs, size, (unsigned long)bh->b_size);
1725 memcpy(bh->b_data + boffs, buf, size);
1726 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
1730 if (offset + size > new_size)
1731 new_size = offset + size;
1741 /* correct in-core and on-disk sizes */
1742 if (new_size > i_size_read(inode)) {
1743 spin_lock(&inode->i_lock);
1744 if (new_size > i_size_read(inode))
1745 i_size_write(inode, new_size);
1746 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1747 LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1750 spin_unlock(&inode->i_lock);
1752 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1760 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1761 const struct lu_buf *buf, loff_t *pos,
1762 struct thandle *handle, int ignore_quota)
1764 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1765 struct osd_thandle *oh;
1769 LASSERT(dt_object_exists(dt));
1771 LASSERT(handle != NULL);
1772 LASSERT(inode != NULL);
1773 ll_vfs_dq_init(inode);
1775 /* XXX: don't check: one declared chunk can be used many times */
1776 /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1778 oh = container_of(handle, struct osd_thandle, ot_super);
1779 LASSERT(oh->ot_handle->h_transaction != NULL);
1780 osd_trans_exec_op(env, handle, OSD_OT_WRITE);
1782 /* Write small symlink to inode body as we need to maintain correct
1783 * on-disk symlinks for ldiskfs.
1784 * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1785 * does not count it in.
1787 is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1788 if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1789 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1791 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1792 buf->lb_len, is_link, pos,
1795 result = buf->lb_len;
1797 osd_trans_exec_check(env, handle, OSD_OT_WRITE);
1802 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1803 __u64 start, __u64 end, struct thandle *th)
1805 struct osd_thandle *oh;
1806 struct inode *inode;
1811 oh = container_of(th, struct osd_thandle, ot_super);
1814 * we don't need to reserve credits for whole truncate
1815 * it's not possible as truncate may need to free too many
1816 * blocks and that won't fit a single transaction. instead
1817 * we reserve credits to change i_size and put inode onto
1818 * orphan list. if needed truncate will extend or restart
1821 osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1822 osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1824 inode = osd_dt_obj(dt)->oo_inode;
1827 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1828 i_projid_read(inode), 0, oh, osd_dt_obj(dt),
1833 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1834 __u64 start, __u64 end, struct thandle *th)
1836 struct osd_thandle *oh;
1837 struct osd_object *obj = osd_dt_obj(dt);
1838 struct inode *inode = obj->oo_inode;
1841 int rc = 0, rc2 = 0;
1844 LASSERT(end == OBD_OBJECT_EOF);
1845 LASSERT(dt_object_exists(dt));
1846 LASSERT(osd_invariant(obj));
1847 LASSERT(inode != NULL);
1848 ll_vfs_dq_init(inode);
1851 oh = container_of(th, struct osd_thandle, ot_super);
1852 LASSERT(oh->ot_handle->h_transaction != NULL);
1854 osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1856 tid = oh->ot_handle->h_transaction->t_tid;
1858 spin_lock(&inode->i_lock);
1859 i_size_write(inode, start);
1860 spin_unlock(&inode->i_lock);
1861 ll_truncate_pagecache(inode, start);
1862 #ifdef HAVE_INODEOPS_TRUNCATE
1863 if (inode->i_op->truncate) {
1864 inode->i_op->truncate(inode);
1867 ldiskfs_truncate(inode);
1870 * For a partial-page truncate, flush the page to disk immediately to
1871 * avoid data corruption during direct disk write. b=17397
1873 if ((start & ~PAGE_MASK) != 0)
1874 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1876 h = journal_current_handle();
1878 LASSERT(h == oh->ot_handle);
1880 /* do not check credits with osd_trans_exec_check() as the truncate
1881 * can restart the transaction internally and we restart the
1882 * transaction in this case */
1884 if (tid != h->h_transaction->t_tid) {
1885 int credits = oh->ot_credits;
1887 * transaction has changed during truncate
1888 * we need to restart the handle with our credits
1890 if (h->h_buffer_credits < credits) {
1891 if (ldiskfs_journal_extend(h, credits))
1892 rc2 = ldiskfs_journal_restart(h, credits);
1896 RETURN(rc == 0 ? rc2 : rc);
1899 static int fiemap_check_ranges(struct inode *inode,
1900 u64 start, u64 len, u64 *new_len)
1909 if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
1910 maxbytes = inode->i_sb->s_maxbytes;
1912 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
1914 if (start > maxbytes)
1918 * Shrink request scope to what the fs can actually handle.
1920 if (len > maxbytes || (maxbytes - len) < start)
1921 *new_len = maxbytes - start;
1926 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1927 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
1929 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1932 struct fiemap_extent_info fieinfo = {0, };
1933 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1939 if (inode->i_op->fiemap == NULL)
1942 if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
1945 rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
1949 fieinfo.fi_flags = fm->fm_flags;
1950 fieinfo.fi_extents_max = fm->fm_extent_count;
1951 fieinfo.fi_extents_start = fm->fm_extents;
1953 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
1954 filemap_write_and_wait(inode->i_mapping);
1956 rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
1957 fm->fm_flags = fieinfo.fi_flags;
1958 fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
1963 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
1964 __u64 start, __u64 end, enum lu_ladvise_type advice)
1967 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1971 case LU_LADVISE_DONTNEED:
1974 invalidate_mapping_pages(inode->i_mapping,
1975 start >> PAGE_CACHE_SHIFT,
1976 (end - 1) >> PAGE_CACHE_SHIFT);
1987 * in some cases we may need declare methods for objects being created
1988 * e.g., when we create symlink
1990 const struct dt_body_operations osd_body_ops_new = {
1991 .dbo_declare_write = osd_declare_write,
1994 const struct dt_body_operations osd_body_ops = {
1995 .dbo_read = osd_read,
1996 .dbo_declare_write = osd_declare_write,
1997 .dbo_write = osd_write,
1998 .dbo_bufs_get = osd_bufs_get,
1999 .dbo_bufs_put = osd_bufs_put,
2000 .dbo_write_prep = osd_write_prep,
2001 .dbo_declare_write_commit = osd_declare_write_commit,
2002 .dbo_write_commit = osd_write_commit,
2003 .dbo_read_prep = osd_read_prep,
2004 .dbo_declare_punch = osd_declare_punch,
2005 .dbo_punch = osd_punch,
2006 .dbo_fiemap_get = osd_fiemap_get,
2007 .dbo_ladvise = osd_ladvise,