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, 2015, 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 <lustre_ver.h>
41 #include <libcfs/libcfs.h>
42 #include <obd_support.h>
43 #include <lustre_net.h>
45 #include <obd_class.h>
46 #include <lustre_disk.h>
47 #include <lustre_fid.h>
48 #include <lustre/lustre_idl.h> /* LLOG_MIN_CHUNK_SIZE definition */
50 #include "osd_internal.h"
52 #include <sys/dnode.h>
57 #include <sys/spa_impl.h>
58 #include <sys/zfs_znode.h>
59 #include <sys/dmu_tx.h>
60 #include <sys/dmu_objset.h>
61 #include <sys/dsl_prop.h>
62 #include <sys/sa_impl.h>
65 static char *osd_zerocopy_tag = "zerocopy";
68 static void record_start_io(struct osd_device *osd, int rw, int discont_pages)
70 struct obd_histogram *h = osd->od_brw_stats.hist;
73 atomic_inc(&osd->od_r_in_flight);
74 lprocfs_oh_tally(&h[BRW_R_RPC_HIST],
75 atomic_read(&osd->od_r_in_flight));
76 lprocfs_oh_tally(&h[BRW_R_DISCONT_PAGES], discont_pages);
79 atomic_inc(&osd->od_w_in_flight);
80 lprocfs_oh_tally(&h[BRW_W_RPC_HIST],
81 atomic_read(&osd->od_w_in_flight));
82 lprocfs_oh_tally(&h[BRW_W_DISCONT_PAGES], discont_pages);
87 static void record_end_io(struct osd_device *osd, int rw,
88 unsigned long elapsed, int disksize, int npages)
90 struct obd_histogram *h = osd->od_brw_stats.hist;
93 atomic_dec(&osd->od_r_in_flight);
94 lprocfs_oh_tally_log2(&h[BRW_R_PAGES], npages);
96 lprocfs_oh_tally_log2(&h[BRW_R_DISK_IOSIZE], disksize);
98 lprocfs_oh_tally_log2(&h[BRW_R_IO_TIME], elapsed);
101 atomic_dec(&osd->od_w_in_flight);
102 lprocfs_oh_tally_log2(&h[BRW_W_PAGES], npages);
104 lprocfs_oh_tally_log2(&h[BRW_W_DISK_IOSIZE], disksize);
106 lprocfs_oh_tally_log2(&h[BRW_W_IO_TIME], elapsed);
110 static ssize_t osd_read(const struct lu_env *env, struct dt_object *dt,
111 struct lu_buf *buf, loff_t *pos)
113 struct osd_object *obj = osd_dt_obj(dt);
114 struct osd_device *osd = osd_obj2dev(obj);
116 int size = buf->lb_len;
120 LASSERT(dt_object_exists(dt));
123 start = cfs_time_current();
125 read_lock(&obj->oo_attr_lock);
126 old_size = obj->oo_attr.la_size;
127 read_unlock(&obj->oo_attr_lock);
129 if (*pos + size > old_size) {
133 size = old_size - *pos;
136 record_start_io(osd, READ, 0);
138 rc = -dmu_read(osd->od_os, obj->oo_db->db_object, *pos, size,
139 buf->lb_buf, DMU_READ_PREFETCH);
141 record_end_io(osd, READ, cfs_time_current() - start, size,
150 static ssize_t osd_declare_write(const struct lu_env *env, struct dt_object *dt,
151 const struct lu_buf *buf, loff_t pos,
154 struct osd_object *obj = osd_dt_obj(dt);
155 struct osd_device *osd = osd_obj2dev(obj);
156 struct osd_thandle *oh;
160 oh = container_of0(th, struct osd_thandle, ot_super);
162 /* in some cases declare can race with creation (e.g. llog)
163 * and we need to wait till object is initialized. notice
164 * LOHA_EXISTs is supposed to be the last step in the
167 /* size change (in dnode) will be declared by dmu_tx_hold_write() */
168 if (dt_object_exists(dt))
169 oid = obj->oo_db->db_object;
171 oid = DMU_NEW_OBJECT;
173 /* XXX: we still miss for append declaration support in ZFS
174 * -1 means append which is used by llog mostly, llog
175 * can grow upto LLOG_MIN_CHUNK_SIZE*8 records */
177 pos = max_t(loff_t, 256 * 8 * LLOG_MIN_CHUNK_SIZE,
178 obj->oo_attr.la_size + (2 << 20));
179 dmu_tx_hold_write(oh->ot_tx, oid, pos, buf->lb_len);
181 /* dt_declare_write() is usually called for system objects, such
182 * as llog or last_rcvd files. We needn't enforce quota on those
183 * objects, so always set the lqi_space as 0. */
184 RETURN(osd_declare_quota(env, osd, obj->oo_attr.la_uid,
185 obj->oo_attr.la_gid, 0, oh, true, NULL,
189 static ssize_t osd_write(const struct lu_env *env, struct dt_object *dt,
190 const struct lu_buf *buf, loff_t *pos,
191 struct thandle *th, int ignore_quota)
193 struct osd_object *obj = osd_dt_obj(dt);
194 struct osd_device *osd = osd_obj2dev(obj);
195 struct osd_thandle *oh;
196 uint64_t offset = *pos;
201 LASSERT(dt_object_exists(dt));
205 oh = container_of0(th, struct osd_thandle, ot_super);
207 record_start_io(osd, WRITE, 0);
209 dmu_write(osd->od_os, obj->oo_db->db_object, offset,
210 (uint64_t)buf->lb_len, buf->lb_buf, oh->ot_tx);
211 write_lock(&obj->oo_attr_lock);
212 if (obj->oo_attr.la_size < offset + buf->lb_len) {
213 obj->oo_attr.la_size = offset + buf->lb_len;
214 write_unlock(&obj->oo_attr_lock);
215 /* osd_object_sa_update() will be copying directly from oo_attr
216 * into dbuf. any update within a single txg will copy the
218 rc = osd_object_sa_update(obj, SA_ZPL_SIZE(osd),
219 &obj->oo_attr.la_size, 8, oh);
223 write_unlock(&obj->oo_attr_lock);
230 record_end_io(osd, WRITE, 0, buf->lb_len,
231 buf->lb_len >> PAGE_SHIFT);
237 * XXX: for the moment I don't want to use lnb_flags for osd-internal
238 * purposes as it's not very well defined ...
239 * instead I use the lowest bit of the address so that:
240 * arc buffer: .lnb_data = abuf (arc we loan for write)
241 * dbuf buffer: .lnb_data = dbuf | 1 (dbuf we get for read)
242 * copy buffer: .lnb_page->mapping = obj (page we allocate for write)
246 static int osd_bufs_put(const struct lu_env *env, struct dt_object *dt,
247 struct niobuf_local *lnb, int npages)
249 struct osd_object *obj = osd_dt_obj(dt);
250 struct osd_device *osd = osd_obj2dev(obj);
254 LASSERT(dt_object_exists(dt));
257 for (i = 0; i < npages; i++) {
258 if (lnb[i].lnb_page == NULL)
260 if (lnb[i].lnb_page->mapping == (void *)obj) {
261 /* this is anonymous page allocated for copy-write */
262 lnb[i].lnb_page->mapping = NULL;
263 __free_page(lnb[i].lnb_page);
264 atomic_dec(&osd->od_zerocopy_alloc);
266 /* see comment in osd_bufs_get_read() */
267 ptr = (unsigned long)lnb[i].lnb_data;
270 dmu_buf_rele((void *)ptr, osd_zerocopy_tag);
271 atomic_dec(&osd->od_zerocopy_pin);
272 } else if (lnb[i].lnb_data != NULL) {
273 dmu_return_arcbuf(lnb[i].lnb_data);
274 atomic_dec(&osd->od_zerocopy_loan);
277 lnb[i].lnb_page = NULL;
278 lnb[i].lnb_data = NULL;
284 static inline struct page *kmem_to_page(void *addr)
286 if (is_vmalloc_addr(addr))
287 return vmalloc_to_page(addr);
289 return virt_to_page(addr);
293 * Prepare buffers for read.
295 * The function maps the range described by \a off and \a len to \a lnb array.
296 * dmu_buf_hold_array_by_bonus() finds/creates appropriate ARC buffers, then
297 * we fill \a lnb array with the pages storing ARC buffers. Notice the current
298 * implementationt passes TRUE to dmu_buf_hold_array_by_bonus() to fill ARC
299 * buffers with actual data, I/O is done in the conext of osd_bufs_get_read().
300 * A better implementation would just return the buffers (potentially unfilled)
301 * and subsequent osd_read_prep() would do I/O for many ranges concurrently.
303 * \param[in] env environment
304 * \param[in] obj object
305 * \param[in] off offset in bytes
306 * \param[in] len the number of bytes to access
307 * \param[out] lnb array of local niobufs pointing to the buffers with data
309 * \retval 0 for success
310 * \retval negative error number of failure
312 static int osd_bufs_get_read(const struct lu_env *env, struct osd_object *obj,
313 loff_t off, ssize_t len, struct niobuf_local *lnb)
315 struct osd_device *osd = osd_obj2dev(obj);
316 unsigned long start = cfs_time_current();
317 int rc, i, numbufs, npages = 0;
321 record_start_io(osd, READ, 0);
323 /* grab buffers for read:
324 * OSD API let us to grab buffers first, then initiate IO(s)
325 * so that all required IOs will be done in parallel, but at the
326 * moment DMU doesn't provide us with a method to grab buffers.
327 * If we discover this is a vital for good performance we
328 * can get own replacement for dmu_buf_hold_array_by_bonus().
331 rc = -dmu_buf_hold_array_by_bonus(obj->oo_db, off, len, TRUE,
332 osd_zerocopy_tag, &numbufs,
337 for (i = 0; i < numbufs; i++) {
338 int bufoff, tocpy, thispage;
343 atomic_inc(&osd->od_zerocopy_pin);
345 bufoff = off - dbp[i]->db_offset;
346 tocpy = min_t(int, dbp[i]->db_size - bufoff, len);
348 /* kind of trick to differentiate dbuf vs. arcbuf */
349 LASSERT(((unsigned long)dbp[i] & 1) == 0);
350 dbf = (void *) ((unsigned long)dbp[i] | 1);
353 thispage = PAGE_SIZE;
354 thispage -= bufoff & (PAGE_SIZE - 1);
355 thispage = min(tocpy, thispage);
358 lnb->lnb_file_offset = off;
359 lnb->lnb_page_offset = bufoff & ~PAGE_MASK;
360 lnb->lnb_len = thispage;
361 lnb->lnb_page = kmem_to_page(dbp[i]->db_data +
363 /* mark just a single slot: we need this
364 * reference to dbuf to be released once */
377 /* steal dbuf so dmu_buf_rele_array() can't release
382 dmu_buf_rele_array(dbp, numbufs, osd_zerocopy_tag);
385 record_end_io(osd, READ, cfs_time_current() - start,
386 npages * PAGE_SIZE, npages);
392 osd_bufs_put(env, &obj->oo_dt, lnb - npages, npages);
396 static int osd_bufs_get_write(const struct lu_env *env, struct osd_object *obj,
397 loff_t off, ssize_t len, struct niobuf_local *lnb)
399 struct osd_device *osd = osd_obj2dev(obj);
400 int plen, off_in_block, sz_in_block;
401 int rc, i = 0, npages = 0;
407 dmu_object_size_from_db(obj->oo_db, &bs, &dummy);
410 * currently only full blocks are subject to zerocopy approach:
411 * so that we're sure nobody is trying to update the same block
414 LASSERT(npages < PTLRPC_MAX_BRW_PAGES);
416 off_in_block = off & (bs - 1);
417 sz_in_block = min_t(int, bs - off_in_block, len);
419 if (sz_in_block == bs) {
420 /* full block, try to use zerocopy */
422 abuf = dmu_request_arcbuf(obj->oo_db, bs);
423 if (unlikely(abuf == NULL))
424 GOTO(out_err, rc = -ENOMEM);
426 atomic_inc(&osd->od_zerocopy_loan);
428 /* go over pages arcbuf contains, put them as
429 * local niobufs for ptlrpc's bulks */
430 while (sz_in_block > 0) {
431 plen = min_t(int, sz_in_block, PAGE_SIZE);
433 lnb[i].lnb_file_offset = off;
434 lnb[i].lnb_page_offset = 0;
435 lnb[i].lnb_len = plen;
437 if (sz_in_block == bs)
438 lnb[i].lnb_data = abuf;
440 lnb[i].lnb_data = NULL;
442 /* this one is not supposed to fail */
443 lnb[i].lnb_page = kmem_to_page(abuf->b_data +
445 LASSERT(lnb[i].lnb_page);
447 lprocfs_counter_add(osd->od_stats,
448 LPROC_OSD_ZEROCOPY_IO, 1);
453 off_in_block += plen;
458 if (off_in_block == 0 && len < bs &&
459 off + len >= obj->oo_attr.la_size)
460 lprocfs_counter_add(osd->od_stats,
461 LPROC_OSD_TAIL_IO, 1);
463 /* can't use zerocopy, allocate temp. buffers */
464 while (sz_in_block > 0) {
465 plen = min_t(int, sz_in_block, PAGE_SIZE);
467 lnb[i].lnb_file_offset = off;
468 lnb[i].lnb_page_offset = 0;
469 lnb[i].lnb_len = plen;
471 lnb[i].lnb_data = NULL;
473 lnb[i].lnb_page = alloc_page(OSD_GFP_IO);
474 if (unlikely(lnb[i].lnb_page == NULL))
475 GOTO(out_err, rc = -ENOMEM);
477 LASSERT(lnb[i].lnb_page->mapping == NULL);
478 lnb[i].lnb_page->mapping = (void *)obj;
480 atomic_inc(&osd->od_zerocopy_alloc);
481 lprocfs_counter_add(osd->od_stats,
482 LPROC_OSD_COPY_IO, 1);
496 osd_bufs_put(env, &obj->oo_dt, lnb, npages);
500 static int osd_bufs_get(const struct lu_env *env, struct dt_object *dt,
501 loff_t offset, ssize_t len, struct niobuf_local *lnb,
504 struct osd_object *obj = osd_dt_obj(dt);
507 LASSERT(dt_object_exists(dt));
511 rc = osd_bufs_get_read(env, obj, offset, len, lnb);
513 rc = osd_bufs_get_write(env, obj, offset, len, lnb);
518 static int osd_write_prep(const struct lu_env *env, struct dt_object *dt,
519 struct niobuf_local *lnb, int npages)
521 struct osd_object *obj = osd_dt_obj(dt);
523 LASSERT(dt_object_exists(dt));
529 static inline uint32_t osd_get_blocksz(struct osd_object *obj)
536 dmu_object_size_from_db(obj->oo_db, &blksz, &unused);
540 static inline uint64_t osd_roundup2blocksz(uint64_t size,
546 size += offset % blksz;
548 if (likely(IS_PO2(blksz)))
549 return PO2_ROUNDUP_TYPED(size, blksz, uint64_t);
556 static int osd_declare_write_commit(const struct lu_env *env,
557 struct dt_object *dt,
558 struct niobuf_local *lnb, int npages,
561 struct osd_object *obj = osd_dt_obj(dt);
562 struct osd_device *osd = osd_obj2dev(obj);
563 struct osd_thandle *oh;
566 uint32_t blksz = osd_get_blocksz(obj);
567 int i, rc, flags = 0;
568 bool ignore_quota = false, synced = false;
570 struct page *last_page = NULL;
571 unsigned long discont_pages = 0;
574 LASSERT(dt_object_exists(dt));
580 oh = container_of0(th, struct osd_thandle, ot_super);
582 for (i = 0; i < npages; i++) {
583 if (last_page && lnb[i].lnb_page->index != (last_page->index + 1))
585 last_page = lnb[i].lnb_page;
587 /* ENOSPC, network RPC error, etc.
588 * We don't want to book space for pages which will be
589 * skipped in osd_write_commit(). Hence we skip pages
590 * with lnb_rc != 0 here too */
592 /* ignore quota for the whole request if any page is from
593 * client cache or written by root.
595 * XXX once we drop the 1.8 client support, the checking
596 * for whether page is from cache can be simplified as:
597 * !(lnb[i].flags & OBD_BRW_SYNC)
599 * XXX we could handle this on per-lnb basis as done by
601 if ((lnb[i].lnb_flags & OBD_BRW_NOQUOTA) ||
602 (lnb[i].lnb_flags & (OBD_BRW_FROM_GRANT | OBD_BRW_SYNC)) ==
606 /* first valid lnb */
607 offset = lnb[i].lnb_file_offset;
608 size = lnb[i].lnb_len;
611 if (offset + size == lnb[i].lnb_file_offset) {
612 /* this lnb is contiguous to the previous one */
613 size += lnb[i].lnb_len;
617 dmu_tx_hold_write(oh->ot_tx, obj->oo_db->db_object,
619 /* Estimating space to be consumed by a write is rather
620 * complicated with ZFS. As a consequence, we don't account for
621 * indirect blocks and just use as a rough estimate the worse
622 * case where the old space is being held by a snapshot. Quota
623 * overrun will be adjusted once the operation is committed, if
625 space += osd_roundup2blocksz(size, offset, blksz);
627 offset = lnb[i].lnb_file_offset;
628 size = lnb[i].lnb_len;
632 dmu_tx_hold_write(oh->ot_tx, obj->oo_db->db_object,
634 space += osd_roundup2blocksz(size, offset, blksz);
637 dmu_tx_hold_sa(oh->ot_tx, obj->oo_sa_hdl, 0);
639 oh->ot_write_commit = 1; /* used in osd_trans_start() for fail_loc */
641 /* backend zfs filesystem might be configured to store multiple data
643 space *= osd->od_os->os_copies;
645 CDEBUG(D_QUOTA, "writing %d pages, reserving %lldK of quota space\n",
648 record_start_io(osd, WRITE, discont_pages);
650 /* acquire quota space if needed */
651 rc = osd_declare_quota(env, osd, obj->oo_attr.la_uid,
652 obj->oo_attr.la_gid, space, oh, true, &flags,
655 if (!synced && rc == -EDQUOT && (flags & QUOTA_FL_SYNC) != 0) {
656 dt_sync(env, th->th_dev);
658 CDEBUG(D_QUOTA, "retry after sync\n");
663 /* we need only to store the overquota flags in the first lnb for
664 * now, once we support multiple objects BRW, this code needs be
666 if (flags & QUOTA_FL_OVER_USRQUOTA)
667 lnb[0].lnb_flags |= OBD_BRW_OVER_USRQUOTA;
668 if (flags & QUOTA_FL_OVER_GRPQUOTA)
669 lnb[0].lnb_flags |= OBD_BRW_OVER_GRPQUOTA;
675 * Policy to grow ZFS block size by write pattern.
676 * For sequential write, it grows block size gradually until it reaches the
677 * maximum blocksize the dataset can support. Otherwise, it will pick a
678 * a block size by the writing region of this I/O.
680 static int osd_grow_blocksize(struct osd_object *obj, struct osd_thandle *oh,
681 uint64_t start, uint64_t end)
683 struct osd_device *osd = osd_obj2dev(obj);
684 dmu_buf_impl_t *db = (dmu_buf_impl_t *)obj->oo_db;
694 if (dn->dn_maxblkid > 0) /* can't change block size */
697 if (dn->dn_datablksz >= osd->od_max_blksz)
700 down_write(&obj->oo_guard);
702 blksz = dn->dn_datablksz;
703 if (blksz >= osd->od_max_blksz) /* check again after grabbing lock */
704 GOTO(out_unlock, rc);
706 /* now ZFS can support up to 16MB block size, and if the write
707 * is sequential, it just increases the block size gradually */
708 if (start <= blksz) { /* sequential */
709 blksz = (uint32_t)min_t(uint64_t, osd->od_max_blksz, end);
710 } else { /* sparse, pick a block size by write region */
711 blksz = (uint32_t)min_t(uint64_t, osd->od_max_blksz,
715 if (!is_power_of_2(blksz))
716 blksz = size_roundup_power2(blksz);
718 if (blksz > dn->dn_datablksz) {
719 rc = -dmu_object_set_blocksize(osd->od_os, dn->dn_object,
720 blksz, 0, oh->ot_tx);
721 LASSERT(ergo(rc == 0, dn->dn_datablksz >= blksz));
723 CDEBUG(D_INODE, "object "DFID": change block size"
724 "%u -> %u error rc = %d\n",
725 PFID(lu_object_fid(&obj->oo_dt.do_lu)),
726 dn->dn_datablksz, blksz, rc);
730 up_write(&obj->oo_guard);
736 static int osd_write_commit(const struct lu_env *env, struct dt_object *dt,
737 struct niobuf_local *lnb, int npages,
740 struct osd_object *obj = osd_dt_obj(dt);
741 struct osd_device *osd = osd_obj2dev(obj);
742 struct osd_thandle *oh;
743 uint64_t new_size = 0;
745 unsigned long iosize = 0;
748 LASSERT(dt_object_exists(dt));
752 oh = container_of0(th, struct osd_thandle, ot_super);
754 /* adjust block size. Assume the buffers are sorted. */
755 (void)osd_grow_blocksize(obj, oh, lnb[0].lnb_file_offset,
756 lnb[npages - 1].lnb_file_offset +
757 lnb[npages - 1].lnb_len);
758 for (i = 0; i < npages; i++) {
759 CDEBUG(D_INODE, "write %u bytes at %u\n",
760 (unsigned) lnb[i].lnb_len,
761 (unsigned) lnb[i].lnb_file_offset);
764 /* ENOSPC, network RPC error, etc.
765 * Unlike ldiskfs, zfs allocates new blocks on rewrite,
766 * so we skip this page if lnb_rc is set to -ENOSPC */
767 CDEBUG(D_INODE, "obj "DFID": skipping lnb[%u]: rc=%d\n",
768 PFID(lu_object_fid(&dt->do_lu)), i,
773 if (lnb[i].lnb_page->mapping == (void *)obj) {
774 dmu_write(osd->od_os, obj->oo_db->db_object,
775 lnb[i].lnb_file_offset, lnb[i].lnb_len,
776 kmap(lnb[i].lnb_page), oh->ot_tx);
777 kunmap(lnb[i].lnb_page);
778 } else if (lnb[i].lnb_data) {
779 LASSERT(((unsigned long)lnb[i].lnb_data & 1) == 0);
780 /* buffer loaned for zerocopy, try to use it.
781 * notice that dmu_assign_arcbuf() is smart
782 * enough to recognize changed blocksize
783 * in this case it fallbacks to dmu_write() */
784 dmu_assign_arcbuf(obj->oo_db, lnb[i].lnb_file_offset,
785 lnb[i].lnb_data, oh->ot_tx);
786 /* drop the reference, otherwise osd_put_bufs()
787 * will be releasing it - bad! */
788 lnb[i].lnb_data = NULL;
789 atomic_dec(&osd->od_zerocopy_loan);
792 if (new_size < lnb[i].lnb_file_offset + lnb[i].lnb_len)
793 new_size = lnb[i].lnb_file_offset + lnb[i].lnb_len;
794 iosize += lnb[i].lnb_len;
797 if (unlikely(new_size == 0)) {
798 /* no pages to write, no transno is needed */
800 /* it is important to return 0 even when all lnb_rc == -ENOSPC
801 * since ofd_commitrw_write() retries several times on ENOSPC */
802 record_end_io(osd, WRITE, 0, 0, 0);
806 write_lock(&obj->oo_attr_lock);
807 if (obj->oo_attr.la_size < new_size) {
808 obj->oo_attr.la_size = new_size;
809 write_unlock(&obj->oo_attr_lock);
810 /* osd_object_sa_update() will be copying directly from
811 * oo_attr into dbuf. any update within a single txg will copy
813 rc = osd_object_sa_update(obj, SA_ZPL_SIZE(osd),
814 &obj->oo_attr.la_size, 8, oh);
816 write_unlock(&obj->oo_attr_lock);
819 record_end_io(osd, WRITE, 0, iosize, npages);
824 static int osd_read_prep(const struct lu_env *env, struct dt_object *dt,
825 struct niobuf_local *lnb, int npages)
827 struct osd_object *obj = osd_dt_obj(dt);
831 LASSERT(dt_object_exists(dt));
834 read_lock(&obj->oo_attr_lock);
835 eof = obj->oo_attr.la_size;
836 read_unlock(&obj->oo_attr_lock);
838 for (i = 0; i < npages; i++) {
839 if (unlikely(lnb[i].lnb_rc < 0))
842 lnb[i].lnb_rc = lnb[i].lnb_len;
844 if (lnb[i].lnb_file_offset + lnb[i].lnb_len >= eof) {
845 if (eof <= lnb[i].lnb_file_offset)
848 lnb[i].lnb_rc = eof - lnb[i].lnb_file_offset;
850 /* all subsequent rc should be 0 */
861 * Punch/truncate an object
863 * IN: db - dmu_buf of the object to free data in.
864 * off - start of section to free.
865 * len - length of section to free (DMU_OBJECT_END => to EOF).
867 * RETURN: 0 if success
868 * error code if failure
870 * The transaction passed to this routine must have
871 * dmu_tx_hold_sa() and if off < size, dmu_tx_hold_free()
872 * called and then assigned to a transaction group.
874 static int __osd_object_punch(objset_t *os, dmu_buf_t *db, dmu_tx_t *tx,
875 uint64_t size, uint64_t off, uint64_t len)
879 /* Assert that the transaction has been assigned to a
880 transaction group. */
881 LASSERT(tx->tx_txg != 0);
883 * Nothing to do if file already at desired length.
885 if (len == DMU_OBJECT_END && size == off)
889 rc = -dmu_free_range(os, db->db_object, off, len, tx);
894 static int osd_punch(const struct lu_env *env, struct dt_object *dt,
895 __u64 start, __u64 end, struct thandle *th)
897 struct osd_object *obj = osd_dt_obj(dt);
898 struct osd_device *osd = osd_obj2dev(obj);
899 struct osd_thandle *oh;
904 LASSERT(dt_object_exists(dt));
905 LASSERT(osd_invariant(obj));
908 oh = container_of0(th, struct osd_thandle, ot_super);
910 write_lock(&obj->oo_attr_lock);
912 if (end == OBD_OBJECT_EOF || end >= obj->oo_attr.la_size)
913 len = DMU_OBJECT_END;
916 write_unlock(&obj->oo_attr_lock);
918 rc = __osd_object_punch(osd->od_os, obj->oo_db, oh->ot_tx,
919 obj->oo_attr.la_size, start, len);
921 if (len == DMU_OBJECT_END) {
922 write_lock(&obj->oo_attr_lock);
923 obj->oo_attr.la_size = start;
924 write_unlock(&obj->oo_attr_lock);
925 rc = osd_object_sa_update(obj, SA_ZPL_SIZE(osd),
926 &obj->oo_attr.la_size, 8, oh);
931 static int osd_declare_punch(const struct lu_env *env, struct dt_object *dt,
932 __u64 start, __u64 end, struct thandle *handle)
934 struct osd_object *obj = osd_dt_obj(dt);
935 struct osd_device *osd = osd_obj2dev(obj);
936 struct osd_thandle *oh;
940 oh = container_of0(handle, struct osd_thandle, ot_super);
942 read_lock(&obj->oo_attr_lock);
943 if (end == OBD_OBJECT_EOF || end >= obj->oo_attr.la_size)
944 len = DMU_OBJECT_END;
948 /* declare we'll free some blocks ... */
949 if (start < obj->oo_attr.la_size) {
950 read_unlock(&obj->oo_attr_lock);
951 dmu_tx_hold_free(oh->ot_tx, obj->oo_db->db_object, start, len);
953 read_unlock(&obj->oo_attr_lock);
956 /* ... and we'll modify size attribute */
957 dmu_tx_hold_sa(oh->ot_tx, obj->oo_sa_hdl, 0);
959 RETURN(osd_declare_quota(env, osd, obj->oo_attr.la_uid,
960 obj->oo_attr.la_gid, 0, oh, true, NULL,
964 static int osd_ladvise(const struct lu_env *env, struct dt_object *dt,
965 __u64 start, __u64 end, enum lu_ladvise_type advice)
979 struct dt_body_operations osd_body_ops = {
980 .dbo_read = osd_read,
981 .dbo_declare_write = osd_declare_write,
982 .dbo_write = osd_write,
983 .dbo_bufs_get = osd_bufs_get,
984 .dbo_bufs_put = osd_bufs_put,
985 .dbo_write_prep = osd_write_prep,
986 .dbo_declare_write_commit = osd_declare_write_commit,
987 .dbo_write_commit = osd_write_commit,
988 .dbo_read_prep = osd_read_prep,
989 .dbo_declare_punch = osd_declare_punch,
990 .dbo_punch = osd_punch,
991 .dbo_ladvise = osd_ladvise,