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) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/osd-zfs/osd_io.c
34 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
35 * Author: Mike Pershin <tappro@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_OSD
40 #include <libcfs/libcfs.h>
41 #include <obd_support.h>
42 #include <lustre_net.h>
44 #include <obd_class.h>
45 #include <lustre_disk.h>
46 #include <lustre_fid.h>
47 #include <lustre_quota.h>
49 #include "osd_internal.h"
51 #include <sys/dnode.h>
56 #include <sys/spa_impl.h>
57 #include <sys/zfs_znode.h>
58 #include <sys/dmu_tx.h>
59 #include <sys/dmu_objset.h>
60 #include <sys/dsl_prop.h>
61 #include <sys/sa_impl.h>
64 static char *osd_0copy_tag = "zerocopy";
67 static void record_start_io(struct osd_device *osd, int rw, int discont_pages)
69 struct obd_histogram *h = osd->od_brw_stats.hist;
72 atomic_inc(&osd->od_r_in_flight);
73 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
74 atomic_read(&osd->od_r_in_flight));
75 lprocfs_oh_tally(&h[BRW_R_DISCONT_PAGES], discont_pages);
78 atomic_inc(&osd->od_w_in_flight);
79 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
80 atomic_read(&osd->od_w_in_flight));
81 lprocfs_oh_tally(&h[BRW_W_DISCONT_PAGES], discont_pages);
86 static void record_end_io(struct osd_device *osd, int rw,
87 unsigned long elapsed, int disksize, int npages)
89 struct obd_histogram *h = osd->od_brw_stats.hist;
92 atomic_dec(&osd->od_r_in_flight);
93 lprocfs_oh_tally_log2(&h[BRW_R_PAGES], npages);
95 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], disksize);
97 lprocfs_oh_tally_log2(&h[BRW_R_IO_TIME], elapsed);
100 atomic_dec(&osd->od_w_in_flight);
101 lprocfs_oh_tally_log2(&h[BRW_W_PAGES], npages);
103 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], disksize);
105 lprocfs_oh_tally_log2(&h[BRW_W_IO_TIME], elapsed);
109 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
110 struct lu_buf *buf, loff_t *pos)
112 struct osd_object *obj = osd_dt_obj(dt);
113 struct osd_device *osd = osd_obj2dev(obj);
114 int size = buf->lb_len;
120 LASSERT(dt_object_exists(dt));
123 read_lock(&obj->oo_attr_lock);
124 old_size = obj->oo_attr.la_size;
125 read_unlock(&obj->oo_attr_lock);
127 if (*pos + size > old_size) {
131 size = old_size - *pos;
135 record_start_io(osd, READ, 0);
137 rc = osd_dmu_read(osd, obj->oo_dn, *pos, size, buf->lb_buf,
140 delta_ms = ktime_ms_delta(ktime_get(), start);
141 record_end_io(osd, READ, delta_ms, size, size >> PAGE_SHIFT);
149 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
150 const struct lu_buf *buf, loff_t pos,
153 struct osd_object *obj = osd_dt_obj(dt);
154 struct osd_device *osd = osd_obj2dev(obj);
155 struct osd_thandle *oh;
159 oh = container_of0(th, struct osd_thandle, ot_super);
161 /* in some cases declare can race with creation (e.g. llog)
162 * and we need to wait till object is initialized. notice
163 * LOHA_EXISTs is supposed to be the last step in the
166 /* size change (in dnode) will be declared by dmu_tx_hold_write() */
167 if (dt_object_exists(dt))
168 oid = obj->oo_dn->dn_object;
170 oid = DMU_NEW_OBJECT;
172 /* XXX: we still miss for append declaration support in ZFS
173 * -1 means append which is used by llog mostly, llog
174 * can grow upto LLOG_MIN_CHUNK_SIZE*8 records */
176 pos = max_t(loff_t, 256 * 8 * LLOG_MIN_CHUNK_SIZE,
177 obj->oo_attr.la_size + (2 << 20));
178 osd_tx_hold_write(oh->ot_tx, oid, obj->oo_dn, pos, buf->lb_len);
180 /* dt_declare_write() is usually called for system objects, such
181 * as llog or last_rcvd files. We needn't enforce quota on those
182 * objects, so always set the lqi_space as 0. */
183 RETURN(osd_declare_quota(env, osd, obj->oo_attr.la_uid,
184 obj->oo_attr.la_gid, obj->oo_attr.la_projid,
185 0, oh, NULL, OSD_QID_BLK));
188 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
189 const struct lu_buf *buf, loff_t *pos,
190 struct thandle *th, int ignore_quota)
192 struct osd_object *obj = osd_dt_obj(dt);
193 struct osd_device *osd = osd_obj2dev(obj);
194 struct osd_thandle *oh;
195 uint64_t offset = *pos;
200 LASSERT(dt_object_exists(dt));
204 oh = container_of0(th, struct osd_thandle, ot_super);
206 osd_dmu_write(osd, obj->oo_dn, offset, (uint64_t)buf->lb_len,
207 buf->lb_buf, oh->ot_tx);
208 write_lock(&obj->oo_attr_lock);
209 if (obj->oo_attr.la_size < offset + buf->lb_len) {
210 obj->oo_attr.la_size = offset + buf->lb_len;
211 write_unlock(&obj->oo_attr_lock);
212 /* osd_object_sa_update() will be copying directly from oo_attr
213 * into dbuf. any update within a single txg will copy the
215 rc = osd_object_sa_update(obj, SA_ZPL_SIZE(osd),
216 &obj->oo_attr.la_size, 8, oh);
220 write_unlock(&obj->oo_attr_lock);
231 * XXX: for the moment I don't want to use lnb_flags for osd-internal
232 * purposes as it's not very well defined ...
233 * instead I use the lowest bit of the address so that:
234 * arc buffer: .lnb_data = abuf (arc we loan for write)
235 * dbuf buffer: .lnb_data = dbuf | 1 (dbuf we get for read)
236 * copy buffer: .lnb_page->mapping = obj (page we allocate for write)
240 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
241 struct niobuf_local *lnb, int npages)
243 struct osd_object *obj = osd_dt_obj(dt);
244 struct osd_device *osd = osd_obj2dev(obj);
248 LASSERT(dt_object_exists(dt));
251 for (i = 0; i < npages; i++) {
252 if (lnb[i].lnb_page == NULL)
254 if (lnb[i].lnb_page->mapping == (void *)obj) {
255 /* this is anonymous page allocated for copy-write */
256 lnb[i].lnb_page->mapping = NULL;
257 __free_page(lnb[i].lnb_page);
258 atomic_dec(&osd->od_zerocopy_alloc);
260 /* see comment in osd_bufs_get_read() */
261 ptr = (unsigned long)lnb[i].lnb_data;
264 dmu_buf_rele((void *)ptr, osd_0copy_tag);
265 atomic_dec(&osd->od_zerocopy_pin);
266 } else if (lnb[i].lnb_data != NULL) {
267 int j, apages, abufsz;
268 abufsz = arc_buf_size(lnb[i].lnb_data);
269 apages = abufsz / PAGE_SIZE;
270 /* these references to pages must be invalidated
271 * to prevent access in osd_bufs_put() */
272 for (j = 0; j < apages; j++)
273 lnb[i + j].lnb_page = NULL;
274 dmu_return_arcbuf(lnb[i].lnb_data);
275 atomic_dec(&osd->od_zerocopy_loan);
278 lnb[i].lnb_page = NULL;
279 lnb[i].lnb_data = NULL;
285 static inline struct page *kmem_to_page(void *addr)
287 LASSERT(!((unsigned long)addr & ~PAGE_MASK));
288 if (is_vmalloc_addr(addr))
289 return vmalloc_to_page(addr);
291 return virt_to_page(addr);
295 * Prepare buffers for read.
297 * The function maps the range described by \a off and \a len to \a lnb array.
298 * dmu_buf_hold_array_by_bonus() finds/creates appropriate ARC buffers, then
299 * we fill \a lnb array with the pages storing ARC buffers. Notice the current
300 * implementationt passes TRUE to dmu_buf_hold_array_by_bonus() to fill ARC
301 * buffers with actual data, I/O is done in the conext of osd_bufs_get_read().
302 * A better implementation would just return the buffers (potentially unfilled)
303 * and subsequent osd_read_prep() would do I/O for many ranges concurrently.
305 * \param[in] env environment
306 * \param[in] obj object
307 * \param[in] off offset in bytes
308 * \param[in] len the number of bytes to access
309 * \param[out] lnb array of local niobufs pointing to the buffers with data
311 * \retval 0 for success
312 * \retval negative error number of failure
314 static int osd_bufs_get_read(const struct lu_env *env, struct osd_object *obj,
315 loff_t off, ssize_t len, struct niobuf_local *lnb)
317 struct osd_device *osd = osd_obj2dev(obj);
318 int rc, i, numbufs, npages = 0;
319 ktime_t start = ktime_get();
324 record_start_io(osd, READ, 0);
326 /* grab buffers for read:
327 * OSD API let us to grab buffers first, then initiate IO(s)
328 * so that all required IOs will be done in parallel, but at the
329 * moment DMU doesn't provide us with a method to grab buffers.
330 * If we discover this is a vital for good performance we
331 * can get own replacement for dmu_buf_hold_array_by_bonus().
334 (obj->oo_dn->dn_datablkshift != 0 ||
335 off < obj->oo_dn->dn_datablksz)) {
336 if (obj->oo_dn->dn_datablkshift == 0 &&
337 off + len > obj->oo_dn->dn_datablksz)
338 len = obj->oo_dn->dn_datablksz - off;
340 rc = -dmu_buf_hold_array_by_bonus(&obj->oo_dn->dn_bonus->db,
341 off, len, TRUE, osd_0copy_tag,
346 for (i = 0; i < numbufs; i++) {
347 int bufoff, tocpy, thispage;
352 atomic_inc(&osd->od_zerocopy_pin);
354 bufoff = off - dbp[i]->db_offset;
355 tocpy = min_t(int, dbp[i]->db_size - bufoff, len);
357 /* kind of trick to differentiate dbuf vs. arcbuf */
358 LASSERT(((unsigned long)dbp[i] & 1) == 0);
359 dbf = (void *) ((unsigned long)dbp[i] | 1);
362 thispage = PAGE_SIZE;
363 thispage -= bufoff & (PAGE_SIZE - 1);
364 thispage = min(tocpy, thispage);
367 lnb->lnb_file_offset = off;
368 lnb->lnb_page_offset = bufoff & ~PAGE_MASK;
369 lnb->lnb_len = thispage;
370 lnb->lnb_page = kmem_to_page(dbp[i]->db_data +
372 /* mark just a single slot: we need this
373 * reference to dbuf to be released once */
386 /* steal dbuf so dmu_buf_rele_array() can't release
391 dmu_buf_rele_array(dbp, numbufs, osd_0copy_tag);
394 delta_ms = ktime_ms_delta(ktime_get(), start);
395 record_end_io(osd, READ, delta_ms, npages * PAGE_SIZE, npages);
401 osd_bufs_put(env, &obj->oo_dt, lnb - npages, npages);
405 static inline arc_buf_t *osd_request_arcbuf(dnode_t *dn, size_t bs)
409 abuf = dmu_request_arcbuf(&dn->dn_bonus->db, bs);
411 return ERR_PTR(-ENOMEM);
413 #if ZFS_VERSION_CODE < OBD_OCD_VERSION(0, 7, 0, 0)
415 * ZFS prior to 0.7.0 doesn't guarantee PAGE_SIZE alignment for zio
416 * blocks smaller than (PAGE_SIZE << 2). This poses a problem of
417 * setting up page array for RDMA transfer. See LU-9305.
419 if ((unsigned long)abuf->b_data & ~PAGE_MASK) {
420 dmu_return_arcbuf(abuf);
428 static int osd_bufs_get_write(const struct lu_env *env, struct osd_object *obj,
429 loff_t off, ssize_t len, struct niobuf_local *lnb)
431 struct osd_device *osd = osd_obj2dev(obj);
432 int plen, off_in_block, sz_in_block;
433 int rc, i = 0, npages = 0;
434 dnode_t *dn = obj->oo_dn;
436 uint32_t bs = dn->dn_datablksz;
440 * currently only full blocks are subject to zerocopy approach:
441 * so that we're sure nobody is trying to update the same block
444 LASSERT(npages < PTLRPC_MAX_BRW_PAGES);
446 off_in_block = off & (bs - 1);
447 sz_in_block = min_t(int, bs - off_in_block, len);
450 if (sz_in_block == bs) {
451 /* full block, try to use zerocopy */
452 abuf = osd_request_arcbuf(dn, bs);
453 if (unlikely(IS_ERR(abuf)))
454 GOTO(out_err, rc = PTR_ERR(abuf));
458 atomic_inc(&osd->od_zerocopy_loan);
460 /* go over pages arcbuf contains, put them as
461 * local niobufs for ptlrpc's bulks */
462 while (sz_in_block > 0) {
463 plen = min_t(int, sz_in_block, PAGE_SIZE);
465 lnb[i].lnb_file_offset = off;
466 lnb[i].lnb_page_offset = 0;
467 lnb[i].lnb_len = plen;
469 if (sz_in_block == bs)
470 lnb[i].lnb_data = abuf;
472 lnb[i].lnb_data = NULL;
474 /* this one is not supposed to fail */
475 lnb[i].lnb_page = kmem_to_page(abuf->b_data +
477 LASSERT(lnb[i].lnb_page);
479 lprocfs_counter_add(osd->od_stats,
480 LPROC_OSD_ZEROCOPY_IO, 1);
485 off_in_block += plen;
490 if (off_in_block == 0 && len < bs &&
491 off + len >= obj->oo_attr.la_size)
492 lprocfs_counter_add(osd->od_stats,
493 LPROC_OSD_TAIL_IO, 1);
495 /* can't use zerocopy, allocate temp. buffers */
496 while (sz_in_block > 0) {
497 plen = min_t(int, sz_in_block, PAGE_SIZE);
499 lnb[i].lnb_file_offset = off;
500 lnb[i].lnb_page_offset = 0;
501 lnb[i].lnb_len = plen;
503 lnb[i].lnb_data = NULL;
505 lnb[i].lnb_page = alloc_page(OSD_GFP_IO);
506 if (unlikely(lnb[i].lnb_page == NULL))
507 GOTO(out_err, rc = -ENOMEM);
509 LASSERT(lnb[i].lnb_page->mapping == NULL);
510 lnb[i].lnb_page->mapping = (void *)obj;
512 atomic_inc(&osd->od_zerocopy_alloc);
513 lprocfs_counter_add(osd->od_stats,
514 LPROC_OSD_COPY_IO, 1);
528 osd_bufs_put(env, &obj->oo_dt, lnb, npages);
532 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
533 loff_t offset, ssize_t len, struct niobuf_local *lnb,
534 enum dt_bufs_type rw)
536 struct osd_object *obj = osd_dt_obj(dt);
539 LASSERT(dt_object_exists(dt));
542 if (rw & DT_BUFS_TYPE_WRITE)
543 rc = osd_bufs_get_write(env, obj, offset, len, lnb);
545 rc = osd_bufs_get_read(env, obj, offset, len, lnb);
550 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
551 struct niobuf_local *lnb, int npages)
553 struct osd_object *obj = osd_dt_obj(dt);
555 LASSERT(dt_object_exists(dt));
561 static inline uint64_t osd_roundup2blocksz(uint64_t size,
567 size += offset % blksz;
569 if (likely(is_power_of_2(blksz)))
570 return PO2_ROUNDUP_TYPED(size, blksz, uint64_t);
577 static int osd_declare_write_commit(const struct lu_env *env,
578 struct dt_object *dt,
579 struct niobuf_local *lnb, int npages,
582 struct osd_object *obj = osd_dt_obj(dt);
583 struct osd_device *osd = osd_obj2dev(obj);
584 struct osd_thandle *oh;
587 uint32_t blksz = obj->oo_dn->dn_datablksz;
588 int i, rc, flags = 0;
591 struct page *last_page = NULL;
592 unsigned long discont_pages = 0;
593 enum osd_qid_declare_flags declare_flags = OSD_QID_BLK;
596 LASSERT(dt_object_exists(dt));
602 oh = container_of0(th, struct osd_thandle, ot_super);
604 for (i = 0; i < npages; i++) {
605 if (last_page && lnb[i].lnb_page->index != (last_page->index + 1))
607 last_page = lnb[i].lnb_page;
609 /* ENOSPC, network RPC error, etc.
610 * We don't want to book space for pages which will be
611 * skipped in osd_write_commit(). Hence we skip pages
612 * with lnb_rc != 0 here too */
614 /* ignore quota for the whole request if any page is from
615 * client cache or written by root.
617 * XXX once we drop the 1.8 client support, the checking
618 * for whether page is from cache can be simplified as:
619 * !(lnb[i].flags & OBD_BRW_SYNC)
621 * XXX we could handle this on per-lnb basis as done by
623 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
624 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
626 declare_flags |= OSD_QID_FORCE;
629 /* first valid lnb */
630 offset = lnb[i].lnb_file_offset;
631 size = lnb[i].lnb_len;
634 if (offset + size == lnb[i].lnb_file_offset) {
635 /* this lnb is contiguous to the previous one */
636 size += lnb[i].lnb_len;
640 osd_tx_hold_write(oh->ot_tx, obj->oo_dn->dn_object,
641 obj->oo_dn, offset, size);
642 /* Estimating space to be consumed by a write is rather
643 * complicated with ZFS. As a consequence, we don't account for
644 * indirect blocks and just use as a rough estimate the worse
645 * case where the old space is being held by a snapshot. Quota
646 * overrun will be adjusted once the operation is committed, if
648 space += osd_roundup2blocksz(size, offset, blksz);
650 offset = lnb[i].lnb_file_offset;
651 size = lnb[i].lnb_len;
655 osd_tx_hold_write(oh->ot_tx, obj->oo_dn->dn_object, obj->oo_dn,
657 space += osd_roundup2blocksz(size, offset, blksz);
660 oh->ot_write_commit = 1; /* used in osd_trans_start() for fail_loc */
662 /* backend zfs filesystem might be configured to store multiple data
664 space *= osd->od_os->os_copies;
666 CDEBUG(D_QUOTA, "writing %d pages, reserving %lldK of quota space\n",
669 record_start_io(osd, WRITE, discont_pages);
671 /* acquire quota space if needed */
672 rc = osd_declare_quota(env, osd, obj->oo_attr.la_uid,
673 obj->oo_attr.la_gid, obj->oo_attr.la_projid,
674 space, oh, &flags, declare_flags);
676 if (!synced && rc == -EDQUOT && (flags & QUOTA_FL_SYNC) != 0) {
677 dt_sync(env, th->th_dev);
679 CDEBUG(D_QUOTA, "retry after sync\n");
684 /* we need only to store the overquota flags in the first lnb for
685 * now, once we support multiple objects BRW, this code needs be
687 if (flags & QUOTA_FL_OVER_USRQUOTA)
688 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
689 if (flags & QUOTA_FL_OVER_GRPQUOTA)
690 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
691 #ifdef ZFS_PROJINHERIT
692 if (flags & QUOTA_FL_OVER_PRJQUOTA)
693 lnb[0].lnb_flags |= OBD_BRW_OVER_PRJQUOTA;
700 * Policy to grow ZFS block size by write pattern.
701 * For sequential write, it grows block size gradually until it reaches the
702 * maximum blocksize the dataset can support. Otherwise, it will pick a
703 * a block size by the writing region of this I/O.
705 static int osd_grow_blocksize(struct osd_object *obj, struct osd_thandle *oh,
706 uint64_t start, uint64_t end)
708 struct osd_device *osd = osd_obj2dev(obj);
709 dnode_t *dn = obj->oo_dn;
715 if (dn->dn_maxblkid > 0) /* can't change block size */
718 if (dn->dn_datablksz >= osd->od_max_blksz)
721 down_write(&obj->oo_guard);
723 blksz = dn->dn_datablksz;
724 if (blksz >= osd->od_max_blksz) /* check again after grabbing lock */
725 GOTO(out_unlock, rc);
727 /* now ZFS can support up to 16MB block size, and if the write
728 * is sequential, it just increases the block size gradually */
729 if (start <= blksz) { /* sequential */
730 blksz = (uint32_t)min_t(uint64_t, osd->od_max_blksz, end);
731 } else { /* sparse, pick a block size by write region */
732 blksz = (uint32_t)min_t(uint64_t, osd->od_max_blksz,
736 if (!is_power_of_2(blksz))
737 blksz = size_roundup_power2(blksz);
739 if (blksz > dn->dn_datablksz) {
740 rc = -dmu_object_set_blocksize(osd->od_os, dn->dn_object,
741 blksz, 0, oh->ot_tx);
742 LASSERT(ergo(rc == 0, dn->dn_datablksz >= blksz));
744 CDEBUG(D_INODE, "object "DFID": change block size"
745 "%u -> %u error rc = %d\n",
746 PFID(lu_object_fid(&obj->oo_dt.do_lu)),
747 dn->dn_datablksz, blksz, rc);
751 up_write(&obj->oo_guard);
756 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
757 struct niobuf_local *lnb, int npages,
760 struct osd_object *obj = osd_dt_obj(dt);
761 struct osd_device *osd = osd_obj2dev(obj);
762 struct osd_thandle *oh;
763 uint64_t new_size = 0;
765 unsigned long iosize = 0;
768 LASSERT(dt_object_exists(dt));
772 oh = container_of0(th, struct osd_thandle, ot_super);
774 /* adjust block size. Assume the buffers are sorted. */
775 (void)osd_grow_blocksize(obj, oh, lnb[0].lnb_file_offset,
776 lnb[npages - 1].lnb_file_offset +
777 lnb[npages - 1].lnb_len);
779 /* LU-8791: take oo_guard to avoid the deadlock that changing block
780 * size and assigning arcbuf take place at the same time.
784 * -> osd_grow_blocksize() with osd_object::oo_guard held
785 * -> dmu_object_set_blocksize()
786 * -> dnode_set_blksz(), with dnode_t::dn_struct_rwlock
789 * -> dmu_buf_will_dirty()
791 * -> wait for the dbuf state to change
794 * -> dmu_assign_arcbuf()
795 * -> dbuf_assign_arcbuf(), set dbuf state to DB_FILL
797 * -> try to hold the read lock of dnode_t::dn_struct_rwlock
799 * By taking the read lock, it can avoid thread 2 to enter into the
800 * critical section of assigning the arcbuf, while thread 1 is
801 * changing the block size.
803 down_read(&obj->oo_guard);
804 for (i = 0; i < npages; i++) {
805 CDEBUG(D_INODE, "write %u bytes at %u\n",
806 (unsigned) lnb[i].lnb_len,
807 (unsigned) lnb[i].lnb_file_offset);
810 /* ENOSPC, network RPC error, etc.
811 * Unlike ldiskfs, zfs allocates new blocks on rewrite,
812 * so we skip this page if lnb_rc is set to -ENOSPC */
813 CDEBUG(D_INODE, "obj "DFID": skipping lnb[%u]: rc=%d\n",
814 PFID(lu_object_fid(&dt->do_lu)), i,
819 if (new_size < lnb[i].lnb_file_offset + lnb[i].lnb_len)
820 new_size = lnb[i].lnb_file_offset + lnb[i].lnb_len;
821 if (lnb[i].lnb_page == NULL)
824 if (lnb[i].lnb_page->mapping == (void *)obj) {
825 osd_dmu_write(osd, obj->oo_dn, lnb[i].lnb_file_offset,
826 lnb[i].lnb_len, kmap(lnb[i].lnb_page),
828 kunmap(lnb[i].lnb_page);
829 iosize += lnb[i].lnb_len;
830 } else if (lnb[i].lnb_data) {
831 int j, apages, abufsz;
832 LASSERT(((unsigned long)lnb[i].lnb_data & 1) == 0);
833 /* buffer loaned for zerocopy, try to use it.
834 * notice that dmu_assign_arcbuf() is smart
835 * enough to recognize changed blocksize
836 * in this case it fallbacks to dmu_write() */
837 abufsz = arc_buf_size(lnb[i].lnb_data);
838 LASSERT(abufsz & PAGE_MASK);
839 apages = abufsz / PAGE_SIZE;
840 LASSERT(i + apages <= npages);
841 /* these references to pages must be invalidated
842 * to prevent access in osd_bufs_put() */
843 for (j = 0; j < apages; j++)
844 lnb[i + j].lnb_page = NULL;
845 dmu_assign_arcbuf(&obj->oo_dn->dn_bonus->db,
846 lnb[i].lnb_file_offset,
847 lnb[i].lnb_data, oh->ot_tx);
848 /* drop the reference, otherwise osd_put_bufs()
849 * will be releasing it - bad! */
850 lnb[i].lnb_data = NULL;
851 atomic_dec(&osd->od_zerocopy_loan);
856 up_read(&obj->oo_guard);
858 if (unlikely(new_size == 0)) {
859 /* no pages to write, no transno is needed */
861 /* it is important to return 0 even when all lnb_rc == -ENOSPC
862 * since ofd_commitrw_write() retries several times on ENOSPC */
863 record_end_io(osd, WRITE, 0, 0, 0);
867 write_lock(&obj->oo_attr_lock);
868 if (obj->oo_attr.la_size < new_size) {
869 obj->oo_attr.la_size = new_size;
870 write_unlock(&obj->oo_attr_lock);
871 /* osd_object_sa_update() will be copying directly from
872 * oo_attr into dbuf. any update within a single txg will copy
874 rc = osd_object_sa_update(obj, SA_ZPL_SIZE(osd),
875 &obj->oo_attr.la_size, 8, oh);
877 write_unlock(&obj->oo_attr_lock);
880 record_end_io(osd, WRITE, 0, iosize, npages);
885 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
886 struct niobuf_local *lnb, int npages)
888 struct osd_object *obj = osd_dt_obj(dt);
892 LASSERT(dt_object_exists(dt));
895 read_lock(&obj->oo_attr_lock);
896 eof = obj->oo_attr.la_size;
897 read_unlock(&obj->oo_attr_lock);
899 for (i = 0; i < npages; i++) {
900 if (unlikely(lnb[i].lnb_rc < 0))
903 lnb[i].lnb_rc = lnb[i].lnb_len;
905 if (lnb[i].lnb_file_offset + lnb[i].lnb_len >= eof) {
906 if (eof <= lnb[i].lnb_file_offset)
909 lnb[i].lnb_rc = eof - lnb[i].lnb_file_offset;
911 /* all subsequent rc should be 0 */
922 * Punch/truncate an object
924 * IN: db - dmu_buf of the object to free data in.
925 * off - start of section to free.
926 * len - length of section to free (DMU_OBJECT_END => to EOF).
928 * RETURN: 0 if success
929 * error code if failure
931 * The transaction passed to this routine must have
932 * dmu_tx_hold_sa() and if off < size, dmu_tx_hold_free()
933 * called and then assigned to a transaction group.
935 static int __osd_object_punch(objset_t *os, dnode_t *dn, dmu_tx_t *tx,
936 uint64_t size, uint64_t off, uint64_t len)
940 /* Assert that the transaction has been assigned to a
941 transaction group. */
942 LASSERT(tx->tx_txg != 0);
944 * Nothing to do if file already at desired length.
946 if (len == DMU_OBJECT_END && size == off)
949 /* XXX: dnode_free_range() can be used to save on dnode lookup */
951 dmu_free_range(os, dn->dn_object, off, len, tx);
956 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
957 __u64 start, __u64 end, struct thandle *th)
959 struct osd_object *obj = osd_dt_obj(dt);
960 struct osd_device *osd = osd_obj2dev(obj);
961 struct osd_thandle *oh;
966 LASSERT(dt_object_exists(dt));
967 LASSERT(osd_invariant(obj));
970 oh = container_of0(th, struct osd_thandle, ot_super);
972 write_lock(&obj->oo_attr_lock);
974 if (end == OBD_OBJECT_EOF || end >= obj->oo_attr.la_size)
975 len = DMU_OBJECT_END;
978 write_unlock(&obj->oo_attr_lock);
980 rc = __osd_object_punch(osd->od_os, obj->oo_dn, oh->ot_tx,
981 obj->oo_attr.la_size, start, len);
983 if (len == DMU_OBJECT_END) {
984 write_lock(&obj->oo_attr_lock);
985 obj->oo_attr.la_size = start;
986 write_unlock(&obj->oo_attr_lock);
987 rc = osd_object_sa_update(obj, SA_ZPL_SIZE(osd),
988 &obj->oo_attr.la_size, 8, oh);
993 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
994 __u64 start, __u64 end, struct thandle *handle)
996 struct osd_object *obj = osd_dt_obj(dt);
997 struct osd_device *osd = osd_obj2dev(obj);
998 struct osd_thandle *oh;
1002 oh = container_of0(handle, struct osd_thandle, ot_super);
1004 read_lock(&obj->oo_attr_lock);
1005 if (end == OBD_OBJECT_EOF || end >= obj->oo_attr.la_size)
1006 len = DMU_OBJECT_END;
1010 /* declare we'll free some blocks ... */
1011 if (start < obj->oo_attr.la_size) {
1012 read_unlock(&obj->oo_attr_lock);
1013 dmu_tx_hold_free(oh->ot_tx, obj->oo_dn->dn_object, start, len);
1015 read_unlock(&obj->oo_attr_lock);
1018 RETURN(osd_declare_quota(env, osd, obj->oo_attr.la_uid,
1019 obj->oo_attr.la_gid, obj->oo_attr.la_projid,
1020 0, oh, NULL, OSD_QID_BLK));
1023 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
1024 __u64 start, __u64 end, enum lu_ladvise_type advice)
1038 struct dt_body_operations osd_body_ops = {
1039 .dbo_read = osd_read,
1040 .dbo_declare_write = osd_declare_write,
1041 .dbo_write = osd_write,
1042 .dbo_bufs_get = osd_bufs_get,
1043 .dbo_bufs_put = osd_bufs_put,
1044 .dbo_write_prep = osd_write_prep,
1045 .dbo_declare_write_commit = osd_declare_write_commit,
1046 .dbo_write_commit = osd_write_commit,
1047 .dbo_read_prep = osd_read_prep,
1048 .dbo_declare_punch = osd_declare_punch,
1049 .dbo_punch = osd_punch,
1050 .dbo_ladvise = osd_ladvise,