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, 2015, 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 static void dio_complete_routine(struct bio *bio, int error)
146 struct osd_iobuf *iobuf = bio->bi_private;
147 #ifdef HAVE_BVEC_ITER
148 struct bvec_iter iter;
155 /* CAVEAT EMPTOR: possibly in IRQ context
156 * DO NOT record procfs stats here!!! */
158 if (unlikely(iobuf == NULL)) {
159 CERROR("***** bio->bi_private is NULL! This should never "
160 "happen. Normally, I would crash here, but instead I "
161 "will dump the bio contents to the console. Please "
162 "report this to <https://jira.hpdd.intel.com/> , along "
163 "with any interesting messages leading up to this point "
164 "(like SCSI errors, perhaps). Because bi_private is "
165 "NULL, I can't wake up the thread that initiated this "
166 "IO - you will probably have to reboot this node.\n");
167 CERROR("bi_next: %p, bi_flags: %lx, bi_rw: %lu, bi_vcnt: %d, "
168 "bi_idx: %d, bi->size: %d, bi_end_io: %p, bi_cnt: %d, "
169 "bi_private: %p\n", bio->bi_next, bio->bi_flags,
170 bio->bi_rw, bio->bi_vcnt, bio_idx(bio),
171 bio_sectors(bio) << 9, bio->bi_end_io,
172 atomic_read(&bio->bi_cnt), bio->bi_private);
176 /* the check is outside of the cycle for performance reason -bzzz */
177 if (!test_bit(__REQ_WRITE, &bio->bi_rw)) {
178 bio_for_each_segment_all(bvl, bio, iter) {
179 if (likely(error == 0))
180 SetPageUptodate(bvl_to_page(bvl));
181 LASSERT(PageLocked(bvl_to_page(bvl)));
183 atomic_dec(&iobuf->dr_dev->od_r_in_flight);
185 atomic_dec(&iobuf->dr_dev->od_w_in_flight);
188 /* any real error is good enough -bzzz */
189 if (error != 0 && iobuf->dr_error == 0)
190 iobuf->dr_error = error;
193 * set dr_elapsed before dr_numreqs turns to 0, otherwise
194 * it's possible that service thread will see dr_numreqs
195 * is zero, but dr_elapsed is not set yet, leading to lost
196 * data in this processing and an assertion in a subsequent
199 if (atomic_read(&iobuf->dr_numreqs) == 1) {
200 iobuf->dr_elapsed = jiffies - iobuf->dr_start_time;
201 iobuf->dr_elapsed_valid = 1;
203 if (atomic_dec_and_test(&iobuf->dr_numreqs))
204 wake_up(&iobuf->dr_wait);
206 /* Completed bios used to be chained off iobuf->dr_bios and freed in
207 * filter_clear_dreq(). It was then possible to exhaust the biovec-256
208 * mempool when serious on-disk fragmentation was encountered,
209 * deadlocking the OST. The bios are now released as soon as complete
210 * so the pool cannot be exhausted while IOs are competing. bug 10076 */
214 static void record_start_io(struct osd_iobuf *iobuf, int size)
216 struct osd_device *osd = iobuf->dr_dev;
217 struct obd_histogram *h = osd->od_brw_stats.hist;
220 atomic_inc(&iobuf->dr_numreqs);
222 if (iobuf->dr_rw == 0) {
223 atomic_inc(&osd->od_r_in_flight);
224 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
225 atomic_read(&osd->od_r_in_flight));
226 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], size);
227 } else if (iobuf->dr_rw == 1) {
228 atomic_inc(&osd->od_w_in_flight);
229 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
230 atomic_read(&osd->od_w_in_flight));
231 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], size);
237 static void osd_submit_bio(int rw, struct bio *bio)
239 LASSERTF(rw == 0 || rw == 1, "%x\n", rw);
241 submit_bio(READ, bio);
243 submit_bio(WRITE, bio);
246 static int can_be_merged(struct bio *bio, sector_t sector)
251 return bio_end_sector(bio) == sector ? 1 : 0;
254 static int osd_do_bio(struct osd_device *osd, struct inode *inode,
255 struct osd_iobuf *iobuf)
257 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
258 struct page **pages = iobuf->dr_pages;
259 int npages = iobuf->dr_npages;
260 sector_t *blocks = iobuf->dr_blocks;
261 int total_blocks = npages * blocks_per_page;
262 int sector_bits = inode->i_sb->s_blocksize_bits - 9;
263 unsigned int blocksize = inode->i_sb->s_blocksize;
264 struct bio *bio = NULL;
266 unsigned int page_offset;
275 LASSERT(iobuf->dr_npages == npages);
277 osd_brw_stats_update(osd, iobuf);
278 iobuf->dr_start_time = cfs_time_current();
280 for (page_idx = 0, block_idx = 0;
282 page_idx++, block_idx += blocks_per_page) {
284 page = pages[page_idx];
285 LASSERT(block_idx + blocks_per_page <= total_blocks);
287 for (i = 0, page_offset = 0;
289 i += nblocks, page_offset += blocksize * nblocks) {
293 if (blocks[block_idx + i] == 0) { /* hole */
294 LASSERTF(iobuf->dr_rw == 0,
295 "page_idx %u, block_idx %u, i %u\n",
296 page_idx, block_idx, i);
297 memset(kmap(page) + page_offset, 0, blocksize);
302 sector = (sector_t)blocks[block_idx + i] << sector_bits;
304 /* Additional contiguous file blocks? */
305 while (i + nblocks < blocks_per_page &&
306 (sector + (nblocks << sector_bits)) ==
307 ((sector_t)blocks[block_idx + i + nblocks] <<
312 can_be_merged(bio, sector) &&
313 bio_add_page(bio, page,
314 blocksize * nblocks, page_offset) != 0)
315 continue; /* added this frag OK */
318 struct request_queue *q =
319 bdev_get_queue(bio->bi_bdev);
320 unsigned int bi_size = bio_sectors(bio) << 9;
322 /* Dang! I have to fragment this I/O */
323 CDEBUG(D_INODE, "bio++ sz %d vcnt %d(%d) "
324 "sectors %d(%d) psg %d(%d) hsg %d(%d)\n",
325 bi_size, bio->bi_vcnt, bio->bi_max_vecs,
327 queue_max_sectors(q),
328 bio_phys_segments(q, bio),
329 queue_max_phys_segments(q),
330 0, queue_max_hw_segments(q));
331 record_start_io(iobuf, bi_size);
332 osd_submit_bio(iobuf->dr_rw, bio);
335 /* allocate new bio */
336 bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,
337 (npages - page_idx) *
340 CERROR("Can't allocate bio %u*%u = %u pages\n",
341 (npages - page_idx), blocks_per_page,
342 (npages - page_idx) * blocks_per_page);
347 bio->bi_bdev = inode->i_sb->s_bdev;
348 bio_set_sector(bio, sector);
349 bio->bi_rw = (iobuf->dr_rw == 0) ? READ : WRITE;
350 bio->bi_end_io = dio_complete_routine;
351 bio->bi_private = iobuf;
353 rc = bio_add_page(bio, page,
354 blocksize * nblocks, page_offset);
360 record_start_io(iobuf, bio_sectors(bio) << 9);
361 osd_submit_bio(iobuf->dr_rw, bio);
366 /* in order to achieve better IO throughput, we don't wait for writes
367 * completion here. instead we proceed with transaction commit in
368 * parallel and wait for IO completion once transaction is stopped
369 * see osd_trans_stop() for more details -bzzz */
370 if (iobuf->dr_rw == 0) {
371 wait_event(iobuf->dr_wait,
372 atomic_read(&iobuf->dr_numreqs) == 0);
373 osd_fini_iobuf(osd, iobuf);
377 rc = iobuf->dr_error;
381 static int osd_map_remote_to_local(loff_t offset, ssize_t len, int *nrpages,
382 struct niobuf_local *lnb)
389 int poff = offset & (PAGE_SIZE - 1);
390 int plen = PAGE_SIZE - poff;
394 lnb->lnb_file_offset = offset;
395 lnb->lnb_page_offset = poff;
397 /* lnb->lnb_flags = rnb->rnb_flags; */
399 lnb->lnb_page = NULL;
402 LASSERTF(plen <= len, "plen %u, len %lld\n", plen,
413 static struct page *osd_get_page(struct dt_object *dt, loff_t offset, int rw)
415 struct inode *inode = osd_dt_obj(dt)->oo_inode;
416 struct osd_device *d = osd_obj2dev(osd_dt_obj(dt));
421 page = find_or_create_page(inode->i_mapping, offset >> PAGE_SHIFT,
422 GFP_NOFS | __GFP_HIGHMEM);
423 if (unlikely(page == NULL))
424 lprocfs_counter_add(d->od_stats, LPROC_OSD_NO_PAGE, 1);
430 * there are following "locks":
441 * - lock pages, unlock
443 * - lock partial page
449 * Unlock and release pages loaded by osd_bufs_get()
451 * Unlock \a npages pages from \a lnb and drop the refcount on them.
453 * \param env thread execution environment
454 * \param dt dt object undergoing IO (OSD object + methods)
455 * \param lnb array of pages undergoing IO
456 * \param npages number of pages in \a lnb
460 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
461 struct niobuf_local *lnb, int npages)
465 for (i = 0; i < npages; i++) {
466 if (lnb[i].lnb_page == NULL)
468 LASSERT(PageLocked(lnb[i].lnb_page));
469 unlock_page(lnb[i].lnb_page);
470 put_page(lnb[i].lnb_page);
471 lu_object_put(env, &dt->do_lu);
472 lnb[i].lnb_page = NULL;
479 * Load and lock pages undergoing IO
481 * Pages as described in the \a lnb array are fetched (from disk or cache)
482 * and locked for IO by the caller.
484 * DLM locking protects us from write and truncate competing for same region,
485 * but partial-page truncate can leave dirty pages in the cache for ldiskfs.
486 * It's possible the writeout on a such a page is in progress when we access
487 * it. It's also possible that during this writeout we put new (partial) data
488 * into the page, but won't be able to proceed in filter_commitrw_write().
489 * Therefore, just wait for writeout completion as it should be rare enough.
491 * \param env thread execution environment
492 * \param dt dt object undergoing IO (OSD object + methods)
493 * \param pos byte offset of IO start
494 * \param len number of bytes of IO
495 * \param lnb array of extents undergoing IO
496 * \param rw read or write operation?
497 * \param capa capabilities
499 * \retval pages (zero or more) loaded successfully
500 * \retval -ENOMEM on memory/page allocation error
502 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
503 loff_t pos, ssize_t len, struct niobuf_local *lnb,
506 struct osd_object *obj = osd_dt_obj(dt);
507 int npages, i, rc = 0;
509 LASSERT(obj->oo_inode);
511 osd_map_remote_to_local(pos, len, &npages, lnb);
513 for (i = 0; i < npages; i++, lnb++) {
514 lnb->lnb_page = osd_get_page(dt, lnb->lnb_file_offset, rw);
515 if (lnb->lnb_page == NULL)
516 GOTO(cleanup, rc = -ENOMEM);
518 wait_on_page_writeback(lnb->lnb_page);
519 BUG_ON(PageWriteback(lnb->lnb_page));
521 lu_object_get(&dt->do_lu);
528 osd_bufs_put(env, dt, lnb - i, i);
532 #ifndef HAVE_LDISKFS_MAP_BLOCKS
534 #ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
535 #define ldiskfs_ext_pblock(ex) ext_pblock((ex))
546 static long ldiskfs_ext_find_goal(struct inode *inode,
547 struct ldiskfs_ext_path *path,
548 unsigned long block, int *aflags)
550 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
551 unsigned long bg_start;
552 unsigned long colour;
556 struct ldiskfs_extent *ex;
557 depth = path->p_depth;
559 /* try to predict block placement */
560 if ((ex = path[depth].p_ext))
561 return ldiskfs_ext_pblock(ex) +
562 (block - le32_to_cpu(ex->ee_block));
564 /* it looks index is empty
565 * try to find starting from index itself */
566 if (path[depth].p_bh)
567 return path[depth].p_bh->b_blocknr;
570 /* OK. use inode's group */
571 bg_start = (ei->i_block_group * LDISKFS_BLOCKS_PER_GROUP(inode->i_sb)) +
572 le32_to_cpu(LDISKFS_SB(inode->i_sb)->s_es->s_first_data_block);
573 colour = (current->pid % 16) *
574 (LDISKFS_BLOCKS_PER_GROUP(inode->i_sb) / 16);
575 return bg_start + colour + block;
578 static unsigned long new_blocks(handle_t *handle, struct inode *inode,
579 struct ldiskfs_ext_path *path,
580 unsigned long block, unsigned long *count,
583 struct ldiskfs_allocation_request ar;
584 unsigned long pblock;
587 /* find neighbour allocated blocks */
589 *err = ldiskfs_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
593 *err = ldiskfs_ext_search_right(inode, path, &ar.lright, &ar.pright);
597 /* allocate new block */
598 ar.goal = ldiskfs_ext_find_goal(inode, path, block, &aflags);
602 ar.flags = LDISKFS_MB_HINT_DATA;
603 pblock = ldiskfs_mb_new_blocks(handle, &ar, err);
608 static int ldiskfs_ext_new_extent_cb(struct inode *inode,
609 struct ldiskfs_ext_path *path,
610 struct ldiskfs_ext_cache *cex,
611 #ifdef HAVE_EXT_PREPARE_CB_EXTENT
612 struct ldiskfs_extent *ex,
616 struct bpointers *bp = cbdata;
617 struct ldiskfs_extent nex;
618 unsigned long pblock = 0;
624 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
625 if (cex->ec_type == LDISKFS_EXT_CACHE_EXTENT) {
627 if ((cex->ec_len != 0) && (cex->ec_start != 0)) {
633 if (bp->create == 0) {
635 if (cex->ec_block < bp->start)
636 i = bp->start - cex->ec_block;
637 if (i >= cex->ec_len)
638 CERROR("nothing to do?! i = %d, e_num = %u\n",
640 for (; i < cex->ec_len && bp->num; i++) {
650 tgen = LDISKFS_I(inode)->i_ext_generation;
651 count = ldiskfs_ext_calc_credits_for_insert(inode, path);
653 handle = osd_journal_start(inode, LDISKFS_HT_MISC,
654 count + LDISKFS_ALLOC_NEEDED + 1);
655 if (IS_ERR(handle)) {
656 return PTR_ERR(handle);
659 if (tgen != LDISKFS_I(inode)->i_ext_generation) {
660 /* the tree has changed. so path can be invalid at moment */
661 ldiskfs_journal_stop(handle);
665 /* In 2.6.32 kernel, ldiskfs_ext_walk_space()'s callback func is not
666 * protected by i_data_sem as whole. so we patch it to store
667 * generation to path and now verify the tree hasn't changed */
668 down_write((&LDISKFS_I(inode)->i_data_sem));
670 /* validate extent, make sure the extent tree does not changed */
671 if (LDISKFS_I(inode)->i_ext_generation != path[0].p_generation) {
672 /* cex is invalid, try again */
673 up_write(&LDISKFS_I(inode)->i_data_sem);
674 ldiskfs_journal_stop(handle);
679 pblock = new_blocks(handle, inode, path, cex->ec_block, &count, &err);
682 BUG_ON(count > cex->ec_len);
684 /* insert new extent */
685 nex.ee_block = cpu_to_le32(cex->ec_block);
686 ldiskfs_ext_store_pblock(&nex, pblock);
687 nex.ee_len = cpu_to_le16(count);
688 err = ldiskfs_ext_insert_extent(handle, inode, path, &nex, 0);
690 /* free data blocks we just allocated */
691 /* not a good idea to call discard here directly,
692 * but otherwise we'd need to call it every free() */
693 ldiskfs_discard_preallocations(inode);
694 #ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
695 ldiskfs_free_blocks(handle, inode, NULL,
696 ldiskfs_ext_pblock(&nex),
697 le16_to_cpu(nex.ee_len), 0);
699 ldiskfs_free_blocks(handle, inode, ldiskfs_ext_pblock(&nex),
700 le16_to_cpu(nex.ee_len), 0);
706 * Putting len of the actual extent we just inserted,
707 * we are asking ldiskfs_ext_walk_space() to continue
708 * scaning after that block
710 cex->ec_len = le16_to_cpu(nex.ee_len);
711 cex->ec_start = ldiskfs_ext_pblock(&nex);
712 BUG_ON(le16_to_cpu(nex.ee_len) == 0);
713 BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
716 up_write((&LDISKFS_I(inode)->i_data_sem));
717 ldiskfs_journal_stop(handle);
722 CERROR("hmm. why do we find this extent?\n");
723 CERROR("initial space: %lu:%u\n",
724 bp->start, bp->init_num);
725 #ifdef LDISKFS_EXT_CACHE_EXTENT /* until kernel 2.6.37 */
726 CERROR("current extent: %u/%u/%llu %d\n",
727 cex->ec_block, cex->ec_len,
728 (unsigned long long)cex->ec_start,
731 CERROR("current extent: %u/%u/%llu\n",
732 cex->ec_block, cex->ec_len,
733 (unsigned long long)cex->ec_start);
737 if (cex->ec_block < bp->start)
738 i = bp->start - cex->ec_block;
739 if (i >= cex->ec_len)
740 CERROR("nothing to do?! i = %d, e_num = %u\n",
742 for (; i < cex->ec_len && bp->num; i++) {
743 *(bp->blocks) = cex->ec_start + i;
745 /* unmap any possible underlying metadata from
746 * the block device mapping. bug 6998. */
747 unmap_underlying_metadata(inode->i_sb->s_bdev,
758 static int osd_ldiskfs_map_nblocks(struct inode *inode, unsigned long index,
759 int clen, sector_t *blocks, int create)
761 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
765 if (index + clen >= inode->i_sb->s_maxbytes >> PAGE_SHIFT)
769 bp.start = index * blocks_per_page;
770 bp.init_num = bp.num = clen * blocks_per_page;
773 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
774 bp.start, bp.start + bp.num - 1, (unsigned)inode->i_ino);
776 err = ldiskfs_ext_walk_space(inode, bp.start, bp.num,
777 ldiskfs_ext_new_extent_cb, &bp);
778 ldiskfs_ext_invalidate_cache(inode);
783 static int osd_ldiskfs_map_bm_inode_pages(struct inode *inode,
784 struct page **page, int pages,
785 sector_t *blocks, int create)
787 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
788 pgoff_t bitmap_max_page_index;
792 bitmap_max_page_index = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes >>
794 for (i = 0, b = blocks; i < pages; i++, page++) {
795 if ((*page)->index + 1 >= bitmap_max_page_index) {
799 rc = ldiskfs_map_inode_page(inode, *page, b, create);
801 CERROR("ino %lu, blk %llu create %d: rc %d\n",
803 (unsigned long long)*b, create, rc);
806 b += blocks_per_page;
811 static int osd_ldiskfs_map_ext_inode_pages(struct inode *inode,
813 int pages, sector_t *blocks,
816 int rc = 0, i = 0, clen = 0;
817 struct page *fp = NULL;
819 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
820 inode->i_ino, pages, (*page)->index);
822 /* pages are sorted already. so, we just have to find
823 * contig. space and process them properly */
826 /* start new extent */
831 } else if (fp->index + clen == (*page)->index) {
832 /* continue the extent */
839 /* process found extent */
840 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
845 /* look for next extent */
847 blocks += clen * (PAGE_SIZE >> inode->i_blkbits);
851 rc = osd_ldiskfs_map_nblocks(inode, fp->index, clen,
858 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
859 int pages, sector_t *blocks,
864 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
865 rc = osd_ldiskfs_map_ext_inode_pages(inode, page, pages,
869 rc = osd_ldiskfs_map_bm_inode_pages(inode, page, pages, blocks, create);
874 static int osd_ldiskfs_map_inode_pages(struct inode *inode, struct page **page,
875 int pages, sector_t *blocks,
878 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
880 struct page *fp = NULL;
882 pgoff_t max_page_index;
884 max_page_index = inode->i_sb->s_maxbytes >> PAGE_SHIFT;
886 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
887 inode->i_ino, pages, (*page)->index);
889 /* pages are sorted already. so, we just have to find
890 * contig. space and process them properly */
892 long blen, total = 0;
893 handle_t *handle = NULL;
894 struct ldiskfs_map_blocks map = { 0 };
896 if (fp == NULL) { /* start new extent */
901 } else if (fp->index + clen == (*page)->index) {
902 /* continue the extent */
908 if (fp->index + clen >= max_page_index)
909 GOTO(cleanup, rc = -EFBIG);
910 /* process found extent */
911 map.m_lblk = fp->index * blocks_per_page;
912 map.m_len = blen = clen * blocks_per_page;
914 create = LDISKFS_GET_BLOCKS_CREATE;
915 handle = ldiskfs_journal_current_handle();
916 LASSERT(handle != NULL);
919 rc = ldiskfs_map_blocks(handle, inode, &map, create);
922 for (; total < blen && c < map.m_len; c++, total++) {
924 *(blocks + total) = 0;
928 *(blocks + total) = map.m_pblk + c;
929 /* unmap any possible underlying
930 * metadata from the block device
931 * mapping. bug 6998. */
932 if ((map.m_flags & LDISKFS_MAP_NEW) &&
934 unmap_underlying_metadata(
941 if (rc == 0 && total < blen) {
942 map.m_lblk = fp->index * blocks_per_page + total;
943 map.m_len = blen - total;
949 /* look for next extent */
951 blocks += blocks_per_page * clen;
956 #endif /* HAVE_LDISKFS_MAP_BLOCKS */
958 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
959 struct niobuf_local *lnb, int npages)
961 struct osd_thread_info *oti = osd_oti_get(env);
962 struct osd_iobuf *iobuf = &oti->oti_iobuf;
963 struct inode *inode = osd_dt_obj(dt)->oo_inode;
964 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
965 struct timeval start;
967 unsigned long timediff;
976 rc = osd_init_iobuf(osd, iobuf, 0, npages);
977 if (unlikely(rc != 0))
980 isize = i_size_read(inode);
981 maxidx = ((isize + PAGE_SIZE - 1) >> PAGE_SHIFT) - 1;
983 if (osd->od_writethrough_cache)
985 if (isize > osd->od_readcache_max_filesize)
988 do_gettimeofday(&start);
989 for (i = 0; i < npages; i++) {
992 generic_error_remove_page(inode->i_mapping,
996 * till commit the content of the page is undefined
997 * we'll set it uptodate once bulk is done. otherwise
998 * subsequent reads can access non-stable data
1000 ClearPageUptodate(lnb[i].lnb_page);
1002 if (lnb[i].lnb_len == PAGE_SIZE)
1005 if (maxidx >= lnb[i].lnb_page->index) {
1006 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1009 char *p = kmap(lnb[i].lnb_page);
1011 off = lnb[i].lnb_page_offset;
1014 off = (lnb[i].lnb_page_offset + lnb[i].lnb_len) &
1017 memset(p + off, 0, PAGE_SIZE - off);
1018 kunmap(lnb[i].lnb_page);
1021 do_gettimeofday(&end);
1022 timediff = cfs_timeval_sub(&end, &start, NULL);
1023 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1025 if (iobuf->dr_npages) {
1026 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1028 iobuf->dr_blocks, 0);
1029 if (likely(rc == 0)) {
1030 rc = osd_do_bio(osd, inode, iobuf);
1031 /* do IO stats for preparation reads */
1032 osd_fini_iobuf(osd, iobuf);
1038 struct osd_fextent {
1041 unsigned int mapped:1;
1044 static int osd_is_mapped(struct dt_object *dt, __u64 offset,
1045 struct osd_fextent *cached_extent)
1047 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1048 sector_t block = offset >> inode->i_blkbits;
1050 struct fiemap_extent_info fei = { 0 };
1051 struct fiemap_extent fe = { 0 };
1052 mm_segment_t saved_fs;
1055 if (block >= cached_extent->start && block < cached_extent->end)
1056 return cached_extent->mapped;
1058 if (i_size_read(inode) == 0)
1061 /* Beyond EOF, must not be mapped */
1062 if (((i_size_read(inode) - 1) >> inode->i_blkbits) < block)
1065 fei.fi_extents_max = 1;
1066 fei.fi_extents_start = &fe;
1068 saved_fs = get_fs();
1070 rc = inode->i_op->fiemap(inode, &fei, offset, FIEMAP_MAX_OFFSET-offset);
1075 start = fe.fe_logical >> inode->i_blkbits;
1077 if (start > block) {
1078 cached_extent->start = block;
1079 cached_extent->end = start;
1080 cached_extent->mapped = 0;
1082 cached_extent->start = start;
1083 cached_extent->end = (fe.fe_logical + fe.fe_length) >>
1085 cached_extent->mapped = 1;
1088 return cached_extent->mapped;
1091 static int osd_declare_write_commit(const struct lu_env *env,
1092 struct dt_object *dt,
1093 struct niobuf_local *lnb, int npages,
1094 struct thandle *handle)
1096 const struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1097 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1098 struct osd_thandle *oh;
1106 bool ignore_quota = false;
1107 long long quota_space = 0;
1108 struct osd_fextent extent = { 0 };
1111 LASSERT(handle != NULL);
1112 oh = container_of0(handle, struct osd_thandle, ot_super);
1113 LASSERT(oh->ot_handle == NULL);
1117 /* calculate number of extents (probably better to pass nb) */
1118 for (i = 0; i < npages; i++) {
1119 if (i && lnb[i].lnb_file_offset !=
1120 lnb[i - 1].lnb_file_offset + lnb[i - 1].lnb_len)
1123 if (!osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent))
1124 quota_space += PAGE_SIZE;
1126 /* ignore quota for the whole request if any page is from
1127 * client cache or written by root.
1129 * XXX once we drop the 1.8 client support, the checking
1130 * for whether page is from cache can be simplified as:
1131 * !(lnb[i].flags & OBD_BRW_SYNC)
1133 * XXX we could handle this on per-lnb basis as done by
1135 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
1136 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
1138 ignore_quota = true;
1142 * each extent can go into new leaf causing a split
1143 * 5 is max tree depth: inode + 4 index blocks
1144 * with blockmaps, depth is 3 at most
1146 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL) {
1148 * many concurrent threads may grow tree by the time
1149 * our transaction starts. so, consider 2 is a min depth
1151 depth = ext_depth(inode);
1152 depth = max(depth, 1) + 1;
1154 credits++; /* inode */
1155 credits += depth * 2 * extents;
1159 credits++; /* inode */
1160 credits += depth * extents;
1163 /* quota space for metadata blocks */
1164 quota_space += depth * extents * LDISKFS_BLOCK_SIZE(osd_sb(osd));
1166 /* quota space should be reported in 1K blocks */
1167 quota_space = toqb(quota_space);
1169 /* each new block can go in different group (bitmap + gd) */
1171 /* we can't dirty more bitmap blocks than exist */
1172 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_groups_count)
1173 credits += LDISKFS_SB(osd_sb(osd))->s_groups_count;
1175 credits += newblocks;
1177 /* we can't dirty more gd blocks than exist */
1178 if (newblocks > LDISKFS_SB(osd_sb(osd))->s_gdb_count)
1179 credits += LDISKFS_SB(osd_sb(osd))->s_gdb_count;
1181 credits += newblocks;
1183 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1185 /* make sure the over quota flags were not set */
1186 lnb[0].lnb_flags &= ~(OBD_BRW_OVER_USRQUOTA | OBD_BRW_OVER_GRPQUOTA);
1188 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1189 quota_space, oh, osd_dt_obj(dt), true,
1190 &flags, ignore_quota);
1192 /* we need only to store the overquota flags in the first lnb for
1193 * now, once we support multiple objects BRW, this code needs be
1195 if (flags & QUOTA_FL_OVER_USRQUOTA)
1196 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
1197 if (flags & QUOTA_FL_OVER_GRPQUOTA)
1198 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
1203 /* Check if a block is allocated or not */
1204 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
1205 struct niobuf_local *lnb, int npages,
1206 struct thandle *thandle)
1208 struct osd_thread_info *oti = osd_oti_get(env);
1209 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1210 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1211 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1214 struct osd_fextent extent = { 0 };
1218 rc = osd_init_iobuf(osd, iobuf, 1, npages);
1219 if (unlikely(rc != 0))
1222 isize = i_size_read(inode);
1223 ll_vfs_dq_init(inode);
1225 for (i = 0; i < npages; i++) {
1226 if (lnb[i].lnb_rc == -ENOSPC &&
1227 osd_is_mapped(dt, lnb[i].lnb_file_offset, &extent)) {
1228 /* Allow the write to proceed if overwriting an
1233 if (lnb[i].lnb_rc) { /* ENOSPC, network RPC error, etc. */
1234 CDEBUG(D_INODE, "Skipping [%d] == %d\n", i,
1236 LASSERT(lnb[i].lnb_page);
1237 generic_error_remove_page(inode->i_mapping,
1242 LASSERT(PageLocked(lnb[i].lnb_page));
1243 LASSERT(!PageWriteback(lnb[i].lnb_page));
1245 if (lnb[i].lnb_file_offset + lnb[i].lnb_len > isize)
1246 isize = lnb[i].lnb_file_offset + lnb[i].lnb_len;
1249 * Since write and truncate are serialized by oo_sem, even
1250 * partial-page truncate should not leave dirty pages in the
1253 LASSERT(!PageDirty(lnb[i].lnb_page));
1255 SetPageUptodate(lnb[i].lnb_page);
1257 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1260 osd_trans_exec_op(env, thandle, OSD_OT_WRITE);
1262 if (OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC)) {
1264 } else if (iobuf->dr_npages > 0) {
1265 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1267 iobuf->dr_blocks, 1);
1269 /* no pages to write, no transno is needed */
1270 thandle->th_local = 1;
1273 if (likely(rc == 0)) {
1274 spin_lock(&inode->i_lock);
1275 if (isize > i_size_read(inode)) {
1276 i_size_write(inode, isize);
1277 LDISKFS_I(inode)->i_disksize = isize;
1278 spin_unlock(&inode->i_lock);
1279 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1281 spin_unlock(&inode->i_lock);
1284 rc = osd_do_bio(osd, inode, iobuf);
1285 /* we don't do stats here as in read path because
1286 * write is async: we'll do this in osd_put_bufs() */
1288 osd_fini_iobuf(osd, iobuf);
1291 osd_trans_exec_check(env, thandle, OSD_OT_WRITE);
1293 if (unlikely(rc != 0)) {
1294 /* if write fails, we should drop pages from the cache */
1295 for (i = 0; i < npages; i++) {
1296 if (lnb[i].lnb_page == NULL)
1298 LASSERT(PageLocked(lnb[i].lnb_page));
1299 generic_error_remove_page(inode->i_mapping,
1307 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
1308 struct niobuf_local *lnb, int npages)
1310 struct osd_thread_info *oti = osd_oti_get(env);
1311 struct osd_iobuf *iobuf = &oti->oti_iobuf;
1312 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1313 struct osd_device *osd = osd_obj2dev(osd_dt_obj(dt));
1314 struct timeval start, end;
1315 unsigned long timediff;
1316 int rc = 0, i, cache = 0, cache_hits = 0, cache_misses = 0;
1321 rc = osd_init_iobuf(osd, iobuf, 0, npages);
1322 if (unlikely(rc != 0))
1325 isize = i_size_read(inode);
1327 if (osd->od_read_cache)
1329 if (isize > osd->od_readcache_max_filesize)
1332 do_gettimeofday(&start);
1333 for (i = 0; i < npages; i++) {
1335 if (isize <= lnb[i].lnb_file_offset)
1336 /* If there's no more data, abort early.
1337 * lnb->lnb_rc == 0, so it's easy to detect later. */
1340 if (isize < lnb[i].lnb_file_offset + lnb[i].lnb_len)
1341 lnb[i].lnb_rc = isize - lnb[i].lnb_file_offset;
1343 lnb[i].lnb_rc = lnb[i].lnb_len;
1345 if (PageUptodate(lnb[i].lnb_page)) {
1349 osd_iobuf_add_page(iobuf, lnb[i].lnb_page);
1353 generic_error_remove_page(inode->i_mapping,
1356 do_gettimeofday(&end);
1357 timediff = cfs_timeval_sub(&end, &start, NULL);
1358 lprocfs_counter_add(osd->od_stats, LPROC_OSD_GET_PAGE, timediff);
1360 if (cache_hits != 0)
1361 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_HIT,
1363 if (cache_misses != 0)
1364 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_MISS,
1366 if (cache_hits + cache_misses != 0)
1367 lprocfs_counter_add(osd->od_stats, LPROC_OSD_CACHE_ACCESS,
1368 cache_hits + cache_misses);
1370 if (iobuf->dr_npages) {
1371 rc = osd_ldiskfs_map_inode_pages(inode, iobuf->dr_pages,
1373 iobuf->dr_blocks, 0);
1374 rc = osd_do_bio(osd, inode, iobuf);
1376 /* IO stats will be done in osd_bufs_put() */
1383 * XXX: Another layering violation for now.
1385 * We don't want to use ->f_op->read methods, because generic file write
1387 * - serializes on ->i_sem, and
1389 * - does a lot of extra work like balance_dirty_pages(),
1391 * which doesn't work for globally shared files like /last_rcvd.
1393 static int osd_ldiskfs_readlink(struct inode *inode, char *buffer, int buflen)
1395 struct ldiskfs_inode_info *ei = LDISKFS_I(inode);
1397 memcpy(buffer, (char *)ei->i_data, buflen);
1402 int osd_ldiskfs_read(struct inode *inode, void *buf, int size, loff_t *offs)
1404 struct buffer_head *bh;
1405 unsigned long block;
1411 /* prevent reading after eof */
1412 spin_lock(&inode->i_lock);
1413 if (i_size_read(inode) < *offs + size) {
1414 loff_t diff = i_size_read(inode) - *offs;
1415 spin_unlock(&inode->i_lock);
1417 CDEBUG(D_EXT2, "size %llu is too short to read @%llu\n",
1418 i_size_read(inode), *offs);
1420 } else if (diff == 0) {
1426 spin_unlock(&inode->i_lock);
1429 blocksize = 1 << inode->i_blkbits;
1432 block = *offs >> inode->i_blkbits;
1433 boffs = *offs & (blocksize - 1);
1434 csize = min(blocksize - boffs, size);
1435 bh = __ldiskfs_bread(NULL, inode, block, 0);
1437 CERROR("%s: can't read %u@%llu on ino %lu: rc = %ld\n",
1438 LDISKFS_SB(inode->i_sb)->s_es->s_volume_name,
1439 csize, *offs, inode->i_ino,
1445 memcpy(buf, bh->b_data + boffs, csize);
1448 memset(buf, 0, csize);
1458 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
1459 struct lu_buf *buf, loff_t *pos)
1461 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1464 /* Read small symlink from inode body as we need to maintain correct
1465 * on-disk symlinks for ldiskfs.
1467 if (S_ISLNK(dt->do_lu.lo_header->loh_attr) &&
1468 (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1469 rc = osd_ldiskfs_readlink(inode, buf->lb_buf, buf->lb_len);
1471 rc = osd_ldiskfs_read(inode, buf->lb_buf, buf->lb_len, pos);
1476 static inline int osd_extents_enabled(struct super_block *sb,
1477 struct inode *inode)
1479 if (inode != NULL) {
1480 if (LDISKFS_I(inode)->i_flags & LDISKFS_EXTENTS_FL)
1482 } else if (LDISKFS_HAS_INCOMPAT_FEATURE(sb,
1483 LDISKFS_FEATURE_INCOMPAT_EXTENTS)) {
1489 int osd_calc_bkmap_credits(struct super_block *sb, struct inode *inode,
1490 const loff_t size, const loff_t pos,
1493 int credits, bits, bs, i;
1495 bits = sb->s_blocksize_bits;
1498 /* legacy blockmap: 3 levels * 3 (bitmap,gd,itself)
1499 * we do not expect blockmaps on the large files,
1500 * so let's shrink it to 2 levels (4GB files) */
1502 /* this is default reservation: 2 levels */
1503 credits = (blocks + 2) * 3;
1505 /* actual offset is unknown, hard to optimize */
1509 /* now check for few specific cases to optimize */
1510 if (pos + size <= LDISKFS_NDIR_BLOCKS * bs) {
1513 /* allocate if not allocated */
1514 if (inode == NULL) {
1515 credits += blocks * 2;
1518 for (i = (pos >> bits); i < (pos >> bits) + blocks; i++) {
1519 LASSERT(i < LDISKFS_NDIR_BLOCKS);
1520 if (LDISKFS_I(inode)->i_data[i] == 0)
1523 } else if (pos + size <= (LDISKFS_NDIR_BLOCKS + 1024) * bs) {
1524 /* single indirect */
1525 credits = blocks * 3;
1526 if (inode == NULL ||
1527 LDISKFS_I(inode)->i_data[LDISKFS_IND_BLOCK] == 0)
1530 /* The indirect block may be modified. */
1537 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
1538 const struct lu_buf *buf, loff_t _pos,
1539 struct thandle *handle)
1541 struct osd_object *obj = osd_dt_obj(dt);
1542 struct inode *inode = obj->oo_inode;
1543 struct super_block *sb = osd_sb(osd_obj2dev(obj));
1544 struct osd_thandle *oh;
1545 int rc = 0, est = 0, credits, blocks, allocated = 0;
1551 LASSERT(buf != NULL);
1552 LASSERT(handle != NULL);
1554 oh = container_of0(handle, struct osd_thandle, ot_super);
1555 LASSERT(oh->ot_handle == NULL);
1558 bits = sb->s_blocksize_bits;
1562 /* if this is an append, then we
1563 * should expect cross-block record */
1569 /* blocks to modify */
1570 blocks = ((pos + size + bs - 1) >> bits) - (pos >> bits);
1571 LASSERT(blocks > 0);
1573 if (inode != NULL && _pos != -1) {
1574 /* object size in blocks */
1575 est = (i_size_read(inode) + bs - 1) >> bits;
1576 allocated = inode->i_blocks >> (bits - 9);
1577 if (pos + size <= i_size_read(inode) && est <= allocated) {
1578 /* looks like an overwrite, no need to modify tree */
1580 /* no need to modify i_size */
1585 if (osd_extents_enabled(sb, inode)) {
1587 * many concurrent threads may grow tree by the time
1588 * our transaction starts. so, consider 2 is a min depth
1589 * for every level we may need to allocate a new block
1590 * and take some entries from the old one. so, 3 blocks
1591 * to allocate (bitmap, gd, itself) + old block - 4 per
1594 depth = inode != NULL ? ext_depth(inode) : 0;
1595 depth = max(depth, 1) + 1;
1597 /* if not append, then split may need to modify
1598 * existing blocks moving entries into the new ones */
1601 /* blocks to store data: bitmap,gd,itself */
1602 credits += blocks * 3;
1604 credits = osd_calc_bkmap_credits(sb, inode, size, _pos, blocks);
1606 /* if inode is created as part of the transaction,
1607 * then it's counted already by the creation method */
1613 osd_trans_declare_op(env, oh, OSD_OT_WRITE, credits);
1615 /* dt_declare_write() is usually called for system objects, such
1616 * as llog or last_rcvd files. We needn't enforce quota on those
1617 * objects, so always set the lqi_space as 0. */
1619 rc = osd_declare_inode_qid(env, i_uid_read(inode),
1620 i_gid_read(inode), 0, oh, obj, true,
1625 static int osd_ldiskfs_writelink(struct inode *inode, char *buffer, int buflen)
1627 /* LU-2634: clear the extent format for fast symlink */
1628 ldiskfs_clear_inode_flag(inode, LDISKFS_INODE_EXTENTS);
1630 memcpy((char *)&LDISKFS_I(inode)->i_data, (char *)buffer, buflen);
1631 spin_lock(&inode->i_lock);
1632 LDISKFS_I(inode)->i_disksize = buflen;
1633 i_size_write(inode, buflen);
1634 spin_unlock(&inode->i_lock);
1635 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1640 int osd_ldiskfs_write_record(struct inode *inode, void *buf, int bufsize,
1641 int write_NUL, loff_t *offs, handle_t *handle)
1643 struct buffer_head *bh = NULL;
1644 loff_t offset = *offs;
1645 loff_t new_size = i_size_read(inode);
1646 unsigned long block;
1647 int blocksize = 1 << inode->i_blkbits;
1651 int dirty_inode = 0;
1655 * long symlink write does not count the NUL terminator in
1656 * bufsize, we write it, and the inode's file size does not
1657 * count the NUL terminator as well.
1659 ((char *)buf)[bufsize] = '\0';
1662 while (bufsize > 0) {
1666 block = offset >> inode->i_blkbits;
1667 boffs = offset & (blocksize - 1);
1668 size = min(blocksize - boffs, bufsize);
1669 bh = __ldiskfs_bread(handle, inode, block, 1);
1670 if (IS_ERR_OR_NULL(bh)) {
1677 CERROR("%s: error reading offset %llu (block %lu): "
1679 inode->i_sb->s_id, offset, block, err);
1683 err = ldiskfs_journal_get_write_access(handle, bh);
1685 CERROR("journal_get_write_access() returned error %d\n",
1689 LASSERTF(boffs + size <= bh->b_size,
1690 "boffs %d size %d bh->b_size %lu\n",
1691 boffs, size, (unsigned long)bh->b_size);
1692 memcpy(bh->b_data + boffs, buf, size);
1693 err = ldiskfs_handle_dirty_metadata(handle, NULL, bh);
1697 if (offset + size > new_size)
1698 new_size = offset + size;
1708 /* correct in-core and on-disk sizes */
1709 if (new_size > i_size_read(inode)) {
1710 spin_lock(&inode->i_lock);
1711 if (new_size > i_size_read(inode))
1712 i_size_write(inode, new_size);
1713 if (i_size_read(inode) > LDISKFS_I(inode)->i_disksize) {
1714 LDISKFS_I(inode)->i_disksize = i_size_read(inode);
1717 spin_unlock(&inode->i_lock);
1719 ll_dirty_inode(inode, I_DIRTY_DATASYNC);
1727 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
1728 const struct lu_buf *buf, loff_t *pos,
1729 struct thandle *handle, int ignore_quota)
1731 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1732 struct osd_thandle *oh;
1736 LASSERT(dt_object_exists(dt));
1738 LASSERT(handle != NULL);
1739 LASSERT(inode != NULL);
1740 ll_vfs_dq_init(inode);
1742 /* XXX: don't check: one declared chunk can be used many times */
1743 /* osd_trans_exec_op(env, handle, OSD_OT_WRITE); */
1745 oh = container_of(handle, struct osd_thandle, ot_super);
1746 LASSERT(oh->ot_handle->h_transaction != NULL);
1747 osd_trans_exec_op(env, handle, OSD_OT_WRITE);
1749 /* Write small symlink to inode body as we need to maintain correct
1750 * on-disk symlinks for ldiskfs.
1751 * Note: the buf->lb_buf contains a NUL terminator while buf->lb_len
1752 * does not count it in.
1754 is_link = S_ISLNK(dt->do_lu.lo_header->loh_attr);
1755 if (is_link && (buf->lb_len < sizeof(LDISKFS_I(inode)->i_data)))
1756 result = osd_ldiskfs_writelink(inode, buf->lb_buf, buf->lb_len);
1758 result = osd_ldiskfs_write_record(inode, buf->lb_buf,
1759 buf->lb_len, is_link, pos,
1762 result = buf->lb_len;
1764 osd_trans_exec_check(env, handle, OSD_OT_WRITE);
1769 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
1770 __u64 start, __u64 end, struct thandle *th)
1772 struct osd_thandle *oh;
1773 struct inode *inode;
1778 oh = container_of(th, struct osd_thandle, ot_super);
1781 * we don't need to reserve credits for whole truncate
1782 * it's not possible as truncate may need to free too many
1783 * blocks and that won't fit a single transaction. instead
1784 * we reserve credits to change i_size and put inode onto
1785 * orphan list. if needed truncate will extend or restart
1788 osd_trans_declare_op(env, oh, OSD_OT_PUNCH,
1789 osd_dto_credits_noquota[DTO_ATTR_SET_BASE] + 3);
1791 inode = osd_dt_obj(dt)->oo_inode;
1794 rc = osd_declare_inode_qid(env, i_uid_read(inode), i_gid_read(inode),
1795 0, oh, osd_dt_obj(dt), true, NULL, false);
1799 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
1800 __u64 start, __u64 end, struct thandle *th)
1802 struct osd_thandle *oh;
1803 struct osd_object *obj = osd_dt_obj(dt);
1804 struct inode *inode = obj->oo_inode;
1807 int rc = 0, rc2 = 0;
1810 LASSERT(end == OBD_OBJECT_EOF);
1811 LASSERT(dt_object_exists(dt));
1812 LASSERT(osd_invariant(obj));
1813 LASSERT(inode != NULL);
1814 ll_vfs_dq_init(inode);
1817 oh = container_of(th, struct osd_thandle, ot_super);
1818 LASSERT(oh->ot_handle->h_transaction != NULL);
1820 osd_trans_exec_op(env, th, OSD_OT_PUNCH);
1822 tid = oh->ot_handle->h_transaction->t_tid;
1824 spin_lock(&inode->i_lock);
1825 i_size_write(inode, start);
1826 spin_unlock(&inode->i_lock);
1827 ll_truncate_pagecache(inode, start);
1828 #ifdef HAVE_INODEOPS_TRUNCATE
1829 if (inode->i_op->truncate) {
1830 inode->i_op->truncate(inode);
1833 ldiskfs_truncate(inode);
1836 * For a partial-page truncate, flush the page to disk immediately to
1837 * avoid data corruption during direct disk write. b=17397
1839 if ((start & ~PAGE_MASK) != 0)
1840 rc = filemap_fdatawrite_range(inode->i_mapping, start, start+1);
1842 h = journal_current_handle();
1844 LASSERT(h == oh->ot_handle);
1846 /* do not check credits with osd_trans_exec_check() as the truncate
1847 * can restart the transaction internally and we restart the
1848 * transaction in this case */
1850 if (tid != h->h_transaction->t_tid) {
1851 int credits = oh->ot_credits;
1853 * transaction has changed during truncate
1854 * we need to restart the handle with our credits
1856 if (h->h_buffer_credits < credits) {
1857 if (ldiskfs_journal_extend(h, credits))
1858 rc2 = ldiskfs_journal_restart(h, credits);
1862 RETURN(rc == 0 ? rc2 : rc);
1865 static int fiemap_check_ranges(struct inode *inode,
1866 u64 start, u64 len, u64 *new_len)
1875 if (ldiskfs_test_inode_flag(inode, LDISKFS_INODE_EXTENTS))
1876 maxbytes = inode->i_sb->s_maxbytes;
1878 maxbytes = LDISKFS_SB(inode->i_sb)->s_bitmap_maxbytes;
1880 if (start > maxbytes)
1884 * Shrink request scope to what the fs can actually handle.
1886 if (len > maxbytes || (maxbytes - len) < start)
1887 *new_len = maxbytes - start;
1892 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1893 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
1895 static int osd_fiemap_get(const struct lu_env *env, struct dt_object *dt,
1898 struct fiemap_extent_info fieinfo = {0, };
1899 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1905 if (inode->i_op->fiemap == NULL)
1908 if (fm->fm_extent_count > FIEMAP_MAX_EXTENTS)
1911 rc = fiemap_check_ranges(inode, fm->fm_start, fm->fm_length, &len);
1915 fieinfo.fi_flags = fm->fm_flags;
1916 fieinfo.fi_extents_max = fm->fm_extent_count;
1917 fieinfo.fi_extents_start = fm->fm_extents;
1919 if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
1920 filemap_write_and_wait(inode->i_mapping);
1922 rc = inode->i_op->fiemap(inode, &fieinfo, fm->fm_start, len);
1923 fm->fm_flags = fieinfo.fi_flags;
1924 fm->fm_mapped_extents = fieinfo.fi_extents_mapped;
1929 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
1930 __u64 start, __u64 end, enum lu_ladvise_type advice)
1933 struct inode *inode = osd_dt_obj(dt)->oo_inode;
1937 case LU_LADVISE_DONTNEED:
1940 invalidate_mapping_pages(inode->i_mapping,
1941 start >> PAGE_CACHE_SHIFT,
1942 (end - 1) >> PAGE_CACHE_SHIFT);
1953 * in some cases we may need declare methods for objects being created
1954 * e.g., when we create symlink
1956 const struct dt_body_operations osd_body_ops_new = {
1957 .dbo_declare_write = osd_declare_write,
1960 const struct dt_body_operations osd_body_ops = {
1961 .dbo_read = osd_read,
1962 .dbo_declare_write = osd_declare_write,
1963 .dbo_write = osd_write,
1964 .dbo_bufs_get = osd_bufs_get,
1965 .dbo_bufs_put = osd_bufs_put,
1966 .dbo_write_prep = osd_write_prep,
1967 .dbo_declare_write_commit = osd_declare_write_commit,
1968 .dbo_write_commit = osd_write_commit,
1969 .dbo_read_prep = osd_read_prep,
1970 .dbo_declare_punch = osd_declare_punch,
1971 .dbo_punch = osd_punch,
1972 .dbo_fiemap_get = osd_fiemap_get,
1973 .dbo_ladvise = osd_ladvise,