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;
282 LASSERT(iobuf->dr_npages == npages);
284 osd_brw_stats_update(osd, iobuf);
285 iobuf->dr_start_time = cfs_time_current();
287 for (page_idx = 0, block_idx = 0;
289 page_idx++, block_idx += blocks_per_page) {
291 page = pages[page_idx];
292 LASSERT(block_idx + blocks_per_page <= total_blocks);
294 for (i = 0, page_offset = 0;
296 i += nblocks, page_offset += blocksize * nblocks) {
300 if (blocks[block_idx + i] == 0) { /* hole */
301 LASSERTF(iobuf->dr_rw == 0,
302 "page_idx %u, block_idx %u, i %u\n",
303 page_idx, block_idx, i);
304 memset(kmap(page) + page_offset, 0, blocksize);
309 sector = (sector_t)blocks[block_idx + i] << sector_bits;
311 /* Additional contiguous file blocks? */
312 while (i + nblocks < blocks_per_page &&
313 (sector + (nblocks << sector_bits)) ==
314 ((sector_t)blocks[block_idx + i + nblocks] <<
319 can_be_merged(bio, sector) &&
320 bio_add_page(bio, page,
321 blocksize * nblocks, page_offset) != 0)
322 continue; /* added this frag OK */
325 struct request_queue *q =
326 bdev_get_queue(bio->bi_bdev);
327 unsigned int bi_size = bio_sectors(bio) << 9;
329 /* Dang! I have to fragment this I/O */
330 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
331 "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
332 bi_size, bio->bi_vcnt, bio->bi_max_vecs,
334 queue_max_sectors(q),
335 bio_phys_segments(q, bio),
336 queue_max_phys_segments(q),
337 0, queue_max_hw_segments(q));
338 record_start_io(iobuf, bi_size);
339 osd_submit_bio(iobuf->dr_rw, bio);
342 /* allocate new bio */
343 bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
344 (npages - page_idx) *
347 CERROR("Can't allocate bio %u*%u = %u pages\n",
348 (npages - page_idx), blocks_per_page,
349 (npages - page_idx) * blocks_per_page);
354 bio->bi_bdev = inode->i_sb->s_bdev;
355 bio_set_sector(bio, sector);
356 bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
357 bio->bi_end_io = dio_complete_routine;
358 bio->bi_private = iobuf;
360 rc = bio_add_page(bio, page,
361 blocksize * nblocks, page_offset);
367 record_start_io(iobuf, bio_sectors(bio) << 9);
368 osd_submit_bio(iobuf->dr_rw, bio);
373 /* in order to achieve better IO throughput, we don't wait for writes
374 * completion here. instead we proceed with transaction commit in
375 * parallel and wait for IO completion once transaction is stopped
376 * see osd_trans_stop() for more details -bzzz */
377 if (iobuf->dr_rw == 0) {
378 wait_event(iobuf->dr_wait,
379 atomic_read(&iobuf->dr_numreqs) == 0);
380 osd_fini_iobuf(osd, iobuf);
384 rc = iobuf->dr_error;
388 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
389 struct niobuf_local *lnb)
396 int poff = offset & (PAGE_SIZE - 1);
397 int plen = PAGE_SIZE - poff;
401 lnb->lnb_file_offset = offset;
402 lnb->lnb_page_offset = poff;
404 /* lnb->lnb_flags = rnb->rnb_flags; */
406 lnb->lnb_page = NULL;
409 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
420 static struct page *osd_get_page(struct dt_object *dt, loff_t offset, int rw)
422 struct inode *inode = osd_dt_obj(dt)->oo_inode;
423 struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
428 page = find_or_create_page(inode->i_mapping, offset >> PAGE_SHIFT,
429 GFP_NOFS | __GFP_HIGHMEM);
430 if (unlikely(page == NULL))
431 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
437 * there are following "locks":
448 * - lock pages, unlock
450 * - lock partial page
456 * Unlock and release pages loaded by osd_bufs_get()
458 * Unlock \a npages pages from \a lnb and drop the refcount on them.
460 * \param env thread execution environment
461 * \param dt dt object undergoing IO (OSD object + methods)
462 * \param lnb array of pages undergoing IO
463 * \param npages number of pages in \a lnb
467 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
468 struct niobuf_local *lnb, int npages)
472 for (i = 0; i < npages; i++) {
473 if (lnb[i].lnb_page == NULL)
475 LASSERT(PageLocked(lnb[i].lnb_page));
476 unlock_page(lnb[i].lnb_page);
477 put_page(lnb[i].lnb_page);
478 lu_object_put(env, &dt->do_lu);
479 lnb[i].lnb_page = NULL;
486 * Load and lock pages undergoing IO
488 * Pages as described in the \a lnb array are fetched (from disk or cache)
489 * and locked for IO by the caller.
491 * DLM locking protects us from write and truncate competing for same region,
492 * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
493 * It's possible the writeout on a such a page is in progress when we access
494 * it. It's also possible that during this writeout we put new (partial) data
495 * into the page, but won't be able to proceed in filter_commitrw_write().
496 * Therefore, just wait for writeout completion as it should be rare enough.
498 * \param env thread execution environment
499 * \param dt dt object undergoing IO (OSD object + methods)
500 * \param pos byte offset of IO start
501 * \param len number of bytes of IO
502 * \param lnb array of extents undergoing IO
503 * \param rw read or write operation?
504 * \param capa capabilities
506 * \retval pages (zero or more) loaded successfully
507 * \retval -ENOMEM on memory/page allocation error
509 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
510 loff_t pos, ssize_t len, struct niobuf_local *lnb,
513 struct osd_object *obj = osd_dt_obj(dt);
514 int npages, i, rc = 0;
516 LASSERT(obj->oo_inode);
518 osd_map_remote_to_local(pos, len, &npages, lnb);
520 for (i = 0; i < npages; i++, lnb++) {
521 lnb->lnb_page = osd_get_page(dt, lnb->lnb_file_offset, rw);
522 if (lnb->lnb_page == NULL)
523 GOTO(cleanup, rc = -ENOMEM);
525 wait_on_page_writeback(lnb->lnb_page);
526 BUG_ON(PageWriteback(lnb->lnb_page));
528 lu_object_get(&dt->do_lu);
535 osd_bufs_put(env, dt, lnb - i, i);
539 #ifndef HAVE_LDISKFS_MAP_BLOCKS
541 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
542 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
553 static long ldiskfs_ext_find_goal(struct inode *inode,
554 struct ldiskfs_ext_path *path,
555 unsigned long block, int *aflags)
557 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
558 unsigned long bg_start;
559 unsigned long colour;
563 struct ldiskfs_extent *ex;
564 depth = path->p_depth;
566 /* try to predict block placement */
567 if ((ex = path[depth].p_ext))
568 return ldiskfs_ext_pblock(ex) +
569 (block - le32_to_cpu(ex->ee_block));
571 /* it looks index is empty
572 * try to find starting from index itself */
573 if (path[depth].p_bh)
574 return path[depth].p_bh->b_blocknr;
577 /* OK. use inode's group */
578 bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
579 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
580 colour = (current->pid % 16) *
581 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
582 return bg_start + colour + block;
585 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
586 struct ldiskfs_ext_path *path,
587 unsigned long block, unsigned long *count,
590 struct ldiskfs_allocation_request ar;
591 unsigned long pblock;
594 /* find neighbour allocated blocks */
596 *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
600 *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
604 /* allocate new block */
605 ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
609 ar.flags = LDISKFS_MB_HINT_DATA;
610 pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
615 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
616 struct ldiskfs_ext_path *path,
617 struct ldiskfs_ext_cache *cex,
618 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
619 struct ldiskfs_extent *ex,
623 struct bpointers *bp = cbdata;
624 struct ldiskfs_extent nex;
625 unsigned long pblock = 0;
631 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
632 if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
634 if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
640 if (bp->create == 0) {
642 if (cex->ec_block < bp->start)
643 i = bp->start - cex->ec_block;
644 if (i >= cex->ec_len)
645 CERROR("nothing to do?! i = %d, e_num = %u\n",
647 for (; i < cex->ec_len && bp->num; i++) {
657 tgen = LDISKFS_I(inode)->i_ext_generation;
658 count = ldiskfs_ext_calc_credits_for_insert(inode, path);
660 handle = osd_journal_start(inode, LDISKFS_HT_MISC,
661 count + LDISKFS_ALLOC_NEEDED + 1);
662 if (IS_ERR(handle)) {
663 return PTR_ERR(handle);
666 if (tgen != LDISKFS_I(inode)->i_ext_generation) {
667 /* the tree has changed. so path can be invalid at moment */
668 ldiskfs_journal_stop(handle);
672 /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
673 * protected by i_data_sem as whole. so we patch it to store
674 * generation to path and now verify the tree hasn't changed */
675 down_write((&LDISKFS_I(inode)->i_data_sem));
677 /* validate extent, make sure the extent tree does not changed */
678 if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
679 /* cex is invalid, try again */
680 up_write(&LDISKFS_I(inode)->i_data_sem);
681 ldiskfs_journal_stop(handle);
686 pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
689 BUG_ON(count > cex->ec_len);
691 /* insert new extent */
692 nex.ee_block = cpu_to_le32(cex->ec_block);
693 ldiskfs_ext_store_pblock(&nex, pblock);
694 nex.ee_len = cpu_to_le16(count);
695 err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
697 /* free data blocks we just allocated */
698 /* not a good idea to call discard here directly,
699 * but otherwise we'd need to call it every free() */
700 ldiskfs_discard_preallocations(inode);
701 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
702 ldiskfs_free_blocks(handle, inode, NULL,
703 ldiskfs_ext_pblock(&nex),
704 le16_to_cpu(nex.ee_len), 0);
706 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
707 le16_to_cpu(nex.ee_len), 0);
713 * Putting len of the actual extent we just inserted,
714 * we are asking ldiskfs_ext_walk_space() to continue
715 * scaning after that block
717 cex->ec_len = le16_to_cpu(nex.ee_len);
718 cex->ec_start = ldiskfs_ext_pblock(&nex);
719 BUG_ON(le16_to_cpu(nex.ee_len) == 0);
720 BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
723 up_write((&LDISKFS_I(inode)->i_data_sem));
724 ldiskfs_journal_stop(handle);
729 CERROR("hmm. why do we find this extent?\n");
730 CERROR("initial space: %lu:%u\n",
731 bp->start, bp->init_num);
732 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
733 CERROR("current extent: %u/%u/%llu %d\n",
734 cex->ec_block, cex->ec_len,
735 (unsigned long long)cex->ec_start,
738 CERROR("current extent: %u/%u/%llu\n",
739 cex->ec_block, cex->ec_len,
740 (unsigned long long)cex->ec_start);
744 if (cex->ec_block < bp->start)
745 i = bp->start - cex->ec_block;
746 if (i >= cex->ec_len)
747 CERROR("nothing to do?! i = %d, e_num = %u\n",
749 for (; i < cex->ec_len && bp->num; i++) {
750 *(bp->blocks) = cex->ec_start + i;
752 /* unmap any possible underlying metadata from
753 * the block device mapping. bug 6998. */
754 unmap_underlying_metadata(inode->i_sb->s_bdev,
765 static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
766 int clen, sector_t *blocks, int create)
768 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
772 if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
776 bp.start = index * blocks_per_page;
777 bp.init_num = bp.num = clen * blocks_per_page;
780 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
781 bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
783 err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
784 ldiskfs_ext_new_extent_cb, &bp);
785 ldiskfs_ext_invalidate_cache(inode);
790 static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
791 struct page **page, int pages,
792 sector_t *blocks, int create)
794 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
795 pgoff_t bitmap_max_page_index;
799 bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
801 for (i = 0, b = blocks; i < pages; i++, page++) {
802 if ((*page)->index + 1 >= bitmap_max_page_index) {
806 rc = ldiskfs_map_inode_page(inode, *page, b, create);
808 CERROR("ino %lu, blk %llu create %d: rc %d\n",
810 (unsigned long long)*b, create, rc);
813 b += blocks_per_page;
818 static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
820 int pages, sector_t *blocks,
823 int rc = 0, i = 0, clen = 0;
824 struct page *fp = NULL;
826 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
827 inode->i_ino, pages, (*page)->index);
829 /* pages are sorted already. so, we just have to find
830 * contig. space and process them properly */
833 /* start new extent */
838 } else if (fp->index + clen == (*page)->index) {
839 /* continue the extent */
846 /* process found extent */
847 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
852 /* look for next extent */
854 blocks += clen * (PAGE_SIZE >> inode->i_blkbits);
858 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
865 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
866 int pages, sector_t *blocks,
871 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
872 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
876 rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
881 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
882 int pages, sector_t *blocks,
885 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
887 struct page *fp = NULL;
889 pgoff_t max_page_index;
890 handle_t *handle = NULL;
892 max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
894 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
895 inode->i_ino, pages, (*page)->index);
898 create = LDISKFS_GET_BLOCKS_CREATE;
899 handle = ldiskfs_journal_current_handle();
900 LASSERT(handle != NULL);
901 rc = osd_attach_jinode(inode);
905 /* pages are sorted already. so, we just have to find
906 * contig. space and process them properly */
908 long blen, total = 0;
909 struct ldiskfs_map_blocks map = { 0 };
911 if (fp == NULL) { /* start new extent */
916 } else if (fp->index + clen == (*page)->index) {
917 /* continue the extent */
923 if (fp->index + clen >= max_page_index)
924 GOTO(cleanup, rc = -EFBIG);
925 /* process found extent */
926 map.m_lblk = fp->index * blocks_per_page;
927 map.m_len = blen = clen * blocks_per_page;
929 rc = ldiskfs_map_blocks(handle, inode, &map, create);
932 for (; total < blen && c < map.m_len; c++, total++) {
934 *(blocks + total) = 0;
938 *(blocks + total) = map.m_pblk + c;
939 /* unmap any possible underlying
940 * metadata from the block device
941 * mapping. bug 6998. */
942 if ((map.m_flags & LDISKFS_MAP_NEW) &&
944 unmap_underlying_metadata(
951 if (rc == 0 && total < blen) {
952 map.m_lblk = fp->index * blocks_per_page + total;
953 map.m_len = blen - total;
959 /* look for next extent */
961 blocks += blocks_per_page * clen;
966 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
968 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
969 struct niobuf_local *lnb, int npages)
971 struct osd_thread_info *oti = osd_oti_get(env);
972 struct osd_iobuf *iobuf = &oti->oti_iobuf;
973 struct inode *inode = osd_dt_obj(dt)->oo_inode;
974 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
986 rc = osd_init_iobuf(osd, iobuf, 0, npages);
987 if (unlikely(rc != 0))
990 isize = i_size_read(inode);
991 maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
993 if (osd->od_writethrough_cache)
995 if (isize > osd->od_readcache_max_filesize)
999 for (i = 0; i < npages; i++) {
1002 generic_error_remove_page(inode->i_mapping,
1006 * till commit the content of the page is undefined
1007 * we'll set it uptodate once bulk is done. otherwise
1008 * subsequent reads can access non-stable data
1010 ClearPageUptodate(lnb[i].lnb_page);
1012 if (lnb[i].lnb_len == PAGE_SIZE)
1015 if (maxidx >= lnb[i].lnb_page->index) {
1016 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1019 char *p = kmap(lnb[i].lnb_page);
1021 off = lnb[i].lnb_page_offset;
1024 off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1027 memset(p + off, 0, PAGE_SIZE - off);
1028 kunmap(lnb[i].lnb_page);
1032 timediff = ktime_us_delta(end, start);
1033 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1035 if (iobuf->dr_npages) {
1036 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1038 iobuf->dr_blocks, 0);
1039 if (likely(rc == 0)) {
1040 rc = osd_do_bio(osd, inode, iobuf);
1041 /* do IO stats for preparation reads */
1042 osd_fini_iobuf(osd, iobuf);
1048 struct osd_fextent {
1051 unsigned int mapped:1;
1054 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1055 struct osd_fextent *cached_extent)
1057 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1058 sector_t block = offset >> inode->i_blkbits;
1060 struct fiemap_extent_info fei = { 0 };
1061 struct fiemap_extent fe = { 0 };
1062 mm_segment_t saved_fs;
1065 if (block >= cached_extent->start && block < cached_extent->end)
1066 return cached_extent->mapped;
1068 if (i_size_read(inode) == 0)
1071 /* Beyond EOF, must not be mapped */
1072 if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1075 fei.fi_extents_max = 1;
1076 fei.fi_extents_start = &fe;
1078 saved_fs = get_fs();
1080 rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1085 start = fe.fe_logical >> inode->i_blkbits;
1087 if (start > block) {
1088 cached_extent->start = block;
1089 cached_extent->end = start;
1090 cached_extent->mapped = 0;
1092 cached_extent->start = start;
1093 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1095 cached_extent->mapped = 1;
1098 return cached_extent->mapped;
1101 static int osd_declare_write_commit(const struct lu_env *env,
1102 struct dt_object *dt,
1103 struct niobuf_local *lnb, int npages,
1104 struct thandle *handle)
1106 const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1107 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1108 struct osd_thandle *oh;
1116 bool ignore_quota = false;
1117 long long quota_space = 0;
1118 struct osd_fextent extent = { 0 };
1121 LASSERT(handle != NULL);
1122 oh = container_of0(handle, struct osd_thandle, ot_super);
1123 LASSERT(oh->ot_handle == NULL);
1127 /* calculate number of extents (probably better to pass nb) */
1128 for (i = 0; i < npages; i++) {
1129 if (i && lnb[i].lnb_file_offset !=
1130 lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1133 if (!osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent))
1134 quota_space += PAGE_SIZE;
1136 /* ignore quota for the whole request if any page is from
1137 * client cache or written by root.
1139 * XXX once we drop the 1.8 client support, the checking
1140 * for whether page is from cache can be simplified as:
1141 * !(lnb[i].flags & OBD_BRW_SYNC)
1143 * XXX we could handle this on per-lnb basis as done by
1145 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1146 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1148 ignore_quota = true;
1152 * each extent can go into new leaf causing a split
1153 * 5 is max tree depth: inode + 4 index blocks
1154 * with blockmaps, depth is 3 at most
1156 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1158 * many concurrent threads may grow tree by the time
1159 * our transaction starts. so, consider 2 is a min depth
1161 depth = ext_depth(inode);
1162 depth = max(depth, 1) + 1;
1164 credits++; /* inode */
1165 credits += depth * 2 * extents;
1169 credits++; /* inode */
1170 credits += depth * extents;
1173 /* quota space for metadata blocks */
1174 quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1176 /* quota space should be reported in 1K blocks */
1177 quota_space = toqb(quota_space);
1179 /* each new block can go in different group (bitmap + gd) */
1181 /* we can't dirty more bitmap blocks than exist */
1182 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1183 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1185 credits += newblocks;
1187 /* we can't dirty more gd blocks than exist */
1188 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1189 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1191 credits += newblocks;
1193 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1195 /* make sure the over quota flags were not set */
1196 lnb[0].lnb_flags &= ~(OBD_BRW_OVER_USRQUOTA | OBD_BRW_OVER_GRPQUOTA);
1198 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1199 quota_space, oh, osd_dt_obj(dt), true,
1200 &flags, ignore_quota);
1202 /* we need only to store the overquota flags in the first lnb for
1203 * now, once we support multiple objects BRW, this code needs be
1205 if (flags & QUOTA_FL_OVER_USRQUOTA)
1206 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1207 if (flags & QUOTA_FL_OVER_GRPQUOTA)
1208 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1213 /* Check if a block is allocated or not */
1214 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1215 struct niobuf_local *lnb, int npages,
1216 struct thandle *thandle)
1218 struct osd_thread_info *oti = osd_oti_get(env);
1219 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1220 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1221 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1224 struct osd_fextent extent = { 0 };
1228 rc = osd_init_iobuf(osd, iobuf, 1, npages);
1229 if (unlikely(rc != 0))
1232 isize = i_size_read(inode);
1233 ll_vfs_dq_init(inode);
1235 for (i = 0; i < npages; i++) {
1236 if (lnb[i].lnb_rc == -ENOSPC &&
1237 osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent)) {
1238 /* Allow the write to proceed if overwriting an
1243 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1244 CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1246 LASSERT(lnb[i].lnb_page);
1247 generic_error_remove_page(inode->i_mapping,
1252 LASSERT(PageLocked(lnb[i].lnb_page));
1253 LASSERT(!PageWriteback(lnb[i].lnb_page));
1255 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1256 isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1259 * Since write and truncate are serialized by oo_sem, even
1260 * partial-page truncate should not leave dirty pages in the
1263 LASSERT(!PageDirty(lnb[i].lnb_page));
1265 SetPageUptodate(lnb[i].lnb_page);
1267 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1270 osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1272 if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1274 } else if (iobuf->dr_npages > 0) {
1275 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1277 iobuf->dr_blocks, 1);
1279 /* no pages to write, no transno is needed */
1280 thandle->th_local = 1;
1283 if (likely(rc == 0)) {
1284 spin_lock(&inode->i_lock);
1285 if (isize > i_size_read(inode)) {
1286 i_size_write(inode, isize);
1287 LDISKFS_I(inode)->i_disksize = isize;
1288 spin_unlock(&inode->i_lock);
1289 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1291 spin_unlock(&inode->i_lock);
1294 rc = osd_do_bio(osd, inode, iobuf);
1295 /* we don't do stats here as in read path because
1296 * write is async: we'll do this in osd_put_bufs() */
1298 osd_fini_iobuf(osd, iobuf);
1301 osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1303 if (unlikely(rc != 0)) {
1304 /* if write fails, we should drop pages from the cache */
1305 for (i = 0; i < npages; i++) {
1306 if (lnb[i].lnb_page == NULL)
1308 LASSERT(PageLocked(lnb[i].lnb_page));
1309 generic_error_remove_page(inode->i_mapping,
1317 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1318 struct niobuf_local *lnb, int npages)
1320 struct osd_thread_info *oti = osd_oti_get(env);
1321 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1322 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1323 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1324 int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0;
1331 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1332 if (unlikely(rc != 0))
1335 isize = i_size_read(inode);
1337 if (osd->od_read_cache)
1339 if (isize > osd->od_readcache_max_filesize)
1342 start = ktime_get();
1343 for (i = 0; i < npages; i++) {
1345 if (isize <= lnb[i].lnb_file_offset)
1346 /* If there's no more data, abort early.
1347 * lnb->lnb_rc == 0, so it's easy to detect later. */
1350 if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len)
1351 lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset;
1353 lnb[i].lnb_rc = lnb[i].lnb_len;
1355 if (PageUptodate(lnb[i].lnb_page)) {
1359 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1363 generic_error_remove_page(inode->i_mapping,
1367 timediff = ktime_us_delta(end, start);
1368 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1370 if (cache_hits != 0)
1371 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1373 if (cache_misses != 0)
1374 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1376 if (cache_hits + cache_misses != 0)
1377 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1378 cache_hits + cache_misses);
1380 if (iobuf->dr_npages) {
1381 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1383 iobuf->dr_blocks, 0);
1384 rc = osd_do_bio(osd, inode, iobuf);
1386 /* IO stats will be done in osd_bufs_put() */
1393 * XXX: Another layering violation for now.
1395 * We don't want to use ->f_op->read methods, because generic file write
1397 * - serializes on ->i_sem, and
1399 * - does a lot of extra work like balance_dirty_pages(),
1401 * which doesn't work for globally shared files like /last_rcvd.
1403 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1405 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1407 memcpy(buffer, (char *)ei->i_data, buflen);
1412 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1414 struct buffer_head *bh;
1415 unsigned long block;
1421 /* prevent reading after eof */
1422 spin_lock(&inode->i_lock);
1423 if (i_size_read(inode) < *offs + size) {
1424 loff_t diff = i_size_read(inode) - *offs;
1425 spin_unlock(&inode->i_lock);
1427 CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1428 i_size_read(inode), *offs);
1430 } else if (diff == 0) {
1436 spin_unlock(&inode->i_lock);
1439 blocksize = 1 << inode->i_blkbits;
1442 block = *offs >> inode->i_blkbits;
1443 boffs = *offs & (blocksize - 1);
1444 csize = min(blocksize - boffs, size);
1445 bh = __ldiskfs_bread(NULL, inode, block, 0);
1447 CERROR("%s: can't read %u@%llu on ino %lu: rc = %ld\n",
1448 LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
1449 csize, *offs, inode->i_ino,
1455 memcpy(buf, bh->b_data + boffs, csize);
1458 memset(buf, 0, csize);
1468 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1469 struct lu_buf *buf, loff_t *pos)
1471 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1474 /* Read small symlink from inode body as we need to maintain correct
1475 * on-disk symlinks for ldiskfs.
1477 if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1478 (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1479 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1481 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1486 static inline int osd_extents_enabled(struct super_block *sb,
1487 struct inode *inode)
1489 if (inode != NULL) {
1490 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1492 } else if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
1493 LDISKFS_FEATURE_INCOMPAT_EXTENTS)) {
1499 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1500 const loff_t size, const loff_t pos,
1503 int credits, bits, bs, i;
1505 bits = sb->s_blocksize_bits;
1508 /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1509 * we do not expect blockmaps on the large files,
1510 * so let's shrink it to 2 levels (4GB files) */
1512 /* this is default reservation: 2 levels */
1513 credits = (blocks + 2) * 3;
1515 /* actual offset is unknown, hard to optimize */
1519 /* now check for few specific cases to optimize */
1520 if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1523 /* allocate if not allocated */
1524 if (inode == NULL) {
1525 credits += blocks * 2;
1528 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1529 LASSERT(i < LDISKFS_NDIR_BLOCKS);
1530 if (LDISKFS_I(inode)->i_data[i] == 0)
1533 } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1534 /* single indirect */
1535 credits = blocks * 3;
1536 if (inode == NULL ||
1537 LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1540 /* The indirect block may be modified. */
1547 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1548 const struct lu_buf *buf, loff_t _pos,
1549 struct thandle *handle)
1551 struct osd_object *obj = osd_dt_obj(dt);
1552 struct inode *inode = obj->oo_inode;
1553 struct super_block *sb = osd_sb(osd_obj2dev(obj));
1554 struct osd_thandle *oh;
1555 int rc = 0, est = 0, credits, blocks, allocated = 0;
1561 LASSERT(buf != NULL);
1562 LASSERT(handle != NULL);
1564 oh = container_of0(handle, struct osd_thandle, ot_super);
1565 LASSERT(oh->ot_handle == NULL);
1568 bits = sb->s_blocksize_bits;
1572 /* if this is an append, then we
1573 * should expect cross-block record */
1579 /* blocks to modify */
1580 blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1581 LASSERT(blocks > 0);
1583 if (inode != NULL && _pos != -1) {
1584 /* object size in blocks */
1585 est = (i_size_read(inode) + bs - 1) >> bits;
1586 allocated = inode->i_blocks >> (bits - 9);
1587 if (pos + size <= i_size_read(inode) && est <= allocated) {
1588 /* looks like an overwrite, no need to modify tree */
1590 /* no need to modify i_size */
1595 if (osd_extents_enabled(sb, inode)) {
1597 * many concurrent threads may grow tree by the time
1598 * our transaction starts. so, consider 2 is a min depth
1599 * for every level we may need to allocate a new block
1600 * and take some entries from the old one. so, 3 blocks
1601 * to allocate (bitmap, gd, itself) + old block - 4 per
1604 depth = inode != NULL ? ext_depth(inode) : 0;
1605 depth = max(depth, 1) + 1;
1607 /* if not append, then split may need to modify
1608 * existing blocks moving entries into the new ones */
1611 /* blocks to store data: bitmap,gd,itself */
1612 credits += blocks * 3;
1614 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1616 /* if inode is created as part of the transaction,
1617 * then it's counted already by the creation method */
1623 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1625 /* dt_declare_write() is usually called for system objects, such
1626 * as llog or last_rcvd files. We needn't enforce quota on those
1627 * objects, so always set the lqi_space as 0. */
1629 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1630 i_gid_read(inode), 0, oh, obj, true,
1635 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1637 /* LU-2634: clear the extent format for fast symlink */
1638 ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1640 memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1641 spin_lock(&inode->i_lock);
1642 LDISKFS_I(inode)->i_disksize = buflen;
1643 i_size_write(inode, buflen);
1644 spin_unlock(&inode->i_lock);
1645 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1650 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1651 int write_NUL, loff_t *offs, handle_t *handle)
1653 struct buffer_head *bh = NULL;
1654 loff_t offset = *offs;
1655 loff_t new_size = i_size_read(inode);
1656 unsigned long block;
1657 int blocksize = 1 << inode->i_blkbits;
1661 int dirty_inode = 0;
1665 * long symlink write does not count the NUL terminator in
1666 * bufsize, we write it, and the inode's file size does not
1667 * count the NUL terminator as well.
1669 ((char *)buf)[bufsize] = '\0';
1672 while (bufsize > 0) {
1676 block = offset >> inode->i_blkbits;
1677 boffs = offset & (blocksize - 1);
1678 size = min(blocksize - boffs, bufsize);
1679 bh = __ldiskfs_bread(handle, inode, block, 1);
1680 if (IS_ERR_OR_NULL(bh)) {
1687 CERROR("%s: error reading offset %llu (block %lu): "
1689 inode->i_sb->s_id, offset, block, err);
1693 err = ldiskfs_journal_get_write_access(handle, bh);
1695 CERROR("journal_get_write_access() returned error %d\n",
1699 LASSERTF(boffs + size <= bh->b_size,
1700 "boffs %d size %d bh->b_size %lu\n",
1701 boffs, size, (unsigned long)bh->b_size);
1702 memcpy(bh->b_data + boffs, buf, size);
1703 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
1707 if (offset + size > new_size)
1708 new_size = offset + size;
1718 /* correct in-core and on-disk sizes */
1719 if (new_size > i_size_read(inode)) {
1720 spin_lock(&inode->i_lock);
1721 if (new_size > i_size_read(inode))
1722 i_size_write(inode, new_size);
1723 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1724 LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1727 spin_unlock(&inode->i_lock);
1729 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1737 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1738 const struct lu_buf *buf, loff_t *pos,
1739 struct thandle *handle, int ignore_quota)
1741 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1742 struct osd_thandle *oh;
1746 LASSERT(dt_object_exists(dt));
1748 LASSERT(handle != NULL);
1749 LASSERT(inode != NULL);
1750 ll_vfs_dq_init(inode);
1752 /* XXX: don't check: one declared chunk can be used many times */
1753 /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1755 oh = container_of(handle, struct osd_thandle, ot_super);
1756 LASSERT(oh->ot_handle->h_transaction != NULL);
1757 osd_trans_exec_op(env, handle, OSD_OT_WRITE);
1759 /* Write small symlink to inode body as we need to maintain correct
1760 * on-disk symlinks for ldiskfs.
1761 * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1762 * does not count it in.
1764 is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1765 if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1766 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1768 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1769 buf->lb_len, is_link, pos,
1772 result = buf->lb_len;
1774 osd_trans_exec_check(env, handle, OSD_OT_WRITE);
1779 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1780 __u64 start, __u64 end, struct thandle *th)
1782 struct osd_thandle *oh;
1783 struct inode *inode;
1788 oh = container_of(th, struct osd_thandle, ot_super);
1791 * we don't need to reserve credits for whole truncate
1792 * it's not possible as truncate may need to free too many
1793 * blocks and that won't fit a single transaction. instead
1794 * we reserve credits to change i_size and put inode onto
1795 * orphan list. if needed truncate will extend or restart
1798 osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1799 osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1801 inode = osd_dt_obj(dt)->oo_inode;
1804 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1805 0, oh, osd_dt_obj(dt), true, NULL, false);
1809 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1810 __u64 start, __u64 end, struct thandle *th)
1812 struct osd_thandle *oh;
1813 struct osd_object *obj = osd_dt_obj(dt);
1814 struct inode *inode = obj->oo_inode;
1817 int rc = 0, rc2 = 0;
1820 LASSERT(end == OBD_OBJECT_EOF);
1821 LASSERT(dt_object_exists(dt));
1822 LASSERT(osd_invariant(obj));
1823 LASSERT(inode != NULL);
1824 ll_vfs_dq_init(inode);
1827 oh = container_of(th, struct osd_thandle, ot_super);
1828 LASSERT(oh->ot_handle->h_transaction != NULL);
1830 osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1832 tid = oh->ot_handle->h_transaction->t_tid;
1834 spin_lock(&inode->i_lock);
1835 i_size_write(inode, start);
1836 spin_unlock(&inode->i_lock);
1837 ll_truncate_pagecache(inode, start);
1838 #ifdef HAVE_INODEOPS_TRUNCATE
1839 if (inode->i_op->truncate) {
1840 inode->i_op->truncate(inode);
1843 ldiskfs_truncate(inode);
1846 * For a partial-page truncate, flush the page to disk immediately to
1847 * avoid data corruption during direct disk write. b=17397
1849 if ((start & ~PAGE_MASK) != 0)
1850 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1852 h = journal_current_handle();
1854 LASSERT(h == oh->ot_handle);
1856 /* do not check credits with osd_trans_exec_check() as the truncate
1857 * can restart the transaction internally and we restart the
1858 * transaction in this case */
1860 if (tid != h->h_transaction->t_tid) {
1861 int credits = oh->ot_credits;
1863 * transaction has changed during truncate
1864 * we need to restart the handle with our credits
1866 if (h->h_buffer_credits < credits) {
1867 if (ldiskfs_journal_extend(h, credits))
1868 rc2 = ldiskfs_journal_restart(h, credits);
1872 RETURN(rc == 0 ? rc2 : rc);
1875 static int fiemap_check_ranges(struct inode *inode,
1876 u64 start, u64 len, u64 *new_len)
1885 if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
1886 maxbytes = inode->i_sb->s_maxbytes;
1888 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
1890 if (start > maxbytes)
1894 * Shrink request scope to what the fs can actually handle.
1896 if (len > maxbytes || (maxbytes - len) < start)
1897 *new_len = maxbytes - start;
1902 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1903 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
1905 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1908 struct fiemap_extent_info fieinfo = {0, };
1909 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1915 if (inode->i_op->fiemap == NULL)
1918 if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
1921 rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
1925 fieinfo.fi_flags = fm->fm_flags;
1926 fieinfo.fi_extents_max = fm->fm_extent_count;
1927 fieinfo.fi_extents_start = fm->fm_extents;
1929 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
1930 filemap_write_and_wait(inode->i_mapping);
1932 rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
1933 fm->fm_flags = fieinfo.fi_flags;
1934 fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
1939 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
1940 __u64 start, __u64 end, enum lu_ladvise_type advice)
1943 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1947 case LU_LADVISE_DONTNEED:
1950 invalidate_mapping_pages(inode->i_mapping,
1951 start >> PAGE_CACHE_SHIFT,
1952 (end - 1) >> PAGE_CACHE_SHIFT);
1963 * in some cases we may need declare methods for objects being created
1964 * e.g., when we create symlink
1966 const struct dt_body_operations osd_body_ops_new = {
1967 .dbo_declare_write = osd_declare_write,
1970 const struct dt_body_operations osd_body_ops = {
1971 .dbo_read = osd_read,
1972 .dbo_declare_write = osd_declare_write,
1973 .dbo_write = osd_write,
1974 .dbo_bufs_get = osd_bufs_get,
1975 .dbo_bufs_put = osd_bufs_put,
1976 .dbo_write_prep = osd_write_prep,
1977 .dbo_declare_write_commit = osd_declare_write_commit,
1978 .dbo_write_commit = osd_write_commit,
1979 .dbo_read_prep = osd_read_prep,
1980 .dbo_declare_punch = osd_declare_punch,
1981 .dbo_punch = osd_punch,
1982 .dbo_fiemap_get = osd_fiemap_get,
1983 .dbo_ladvise = osd_ladvise,