4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
26 #include <sys/dmu_impl.h>
27 #include <sys/dmu_tx.h>
29 #include <sys/dnode.h>
30 #include <sys/zfs_context.h>
31 #include <sys/dmu_objset.h>
32 #include <sys/dmu_traverse.h>
33 #include <sys/dsl_dataset.h>
34 #include <sys/dsl_dir.h>
35 #include <sys/dsl_pool.h>
36 #include <sys/dsl_synctask.h>
37 #include <sys/zfs_ioctl.h>
39 #include <sys/zio_checksum.h>
40 #include <sys/zfs_znode.h>
43 struct vnode *da_vp; /* file to which we are reporting */
45 int da_err; /* error that stopped diff search */
46 dmu_diff_record_t da_ddr;
50 write_record(struct diffarg *da)
52 ssize_t resid; /* have to get resid to get detailed errno */
54 if (da->da_ddr.ddr_type == DDR_NONE) {
59 da->da_err = vn_rdwr(UIO_WRITE, da->da_vp, (caddr_t)&da->da_ddr,
60 sizeof (da->da_ddr), 0, UIO_SYSSPACE, FAPPEND,
61 RLIM64_INFINITY, CRED(), &resid);
62 *da->da_offp += sizeof (da->da_ddr);
67 report_free_dnode_range(struct diffarg *da, uint64_t first, uint64_t last)
69 ASSERT(first <= last);
70 if (da->da_ddr.ddr_type != DDR_FREE ||
71 first != da->da_ddr.ddr_last + 1) {
72 if (write_record(da) != 0)
74 da->da_ddr.ddr_type = DDR_FREE;
75 da->da_ddr.ddr_first = first;
76 da->da_ddr.ddr_last = last;
79 da->da_ddr.ddr_last = last;
84 report_dnode(struct diffarg *da, uint64_t object, dnode_phys_t *dnp)
87 if (dnp->dn_type == DMU_OT_NONE)
88 return (report_free_dnode_range(da, object, object));
90 if (da->da_ddr.ddr_type != DDR_INUSE ||
91 object != da->da_ddr.ddr_last + 1) {
92 if (write_record(da) != 0)
94 da->da_ddr.ddr_type = DDR_INUSE;
95 da->da_ddr.ddr_first = da->da_ddr.ddr_last = object;
98 da->da_ddr.ddr_last = object;
102 #define DBP_SPAN(dnp, level) \
103 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
104 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
108 diff_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf,
109 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg)
111 struct diffarg *da = arg;
114 if (issig(JUSTLOOKING) && issig(FORREAL))
117 if (zb->zb_object != DMU_META_DNODE_OBJECT)
121 uint64_t span = DBP_SPAN(dnp, zb->zb_level);
122 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
124 err = report_free_dnode_range(da, dnobj,
125 dnobj + (span >> DNODE_SHIFT) - 1);
128 } else if (zb->zb_level == 0) {
131 uint32_t aflags = ARC_WAIT;
132 int blksz = BP_GET_LSIZE(bp);
135 if (dsl_read(NULL, spa, bp, pbuf,
136 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ,
137 ZIO_FLAG_CANFAIL, &aflags, zb) != 0)
141 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
142 uint64_t dnobj = (zb->zb_blkid <<
143 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
144 err = report_dnode(da, dnobj, blk+i);
148 (void) arc_buf_remove_ref(abuf, &abuf);
151 /* Don't care about the data blocks */
152 return (TRAVERSE_VISIT_NO_CHILDREN);
158 dmu_diff(objset_t *tosnap, objset_t *fromsnap, struct vnode *vp, offset_t *offp)
161 dsl_dataset_t *ds = tosnap->os_dsl_dataset;
162 dsl_dataset_t *fromds = fromsnap->os_dsl_dataset;
163 dsl_dataset_t *findds;
164 dsl_dataset_t *relds;
167 /* make certain we are looking at snapshots */
168 if (!dsl_dataset_is_snapshot(ds) || !dsl_dataset_is_snapshot(fromds))
171 /* fromsnap must be earlier and from the same lineage as tosnap */
172 if (fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg)
178 while (fromds->ds_dir != findds->ds_dir) {
179 dsl_pool_t *dp = ds->ds_dir->dd_pool;
181 if (!dsl_dir_is_clone(findds->ds_dir)) {
183 dsl_dataset_rele(relds, FTAG);
187 rw_enter(&dp->dp_config_rwlock, RW_READER);
188 err = dsl_dataset_hold_obj(dp,
189 findds->ds_dir->dd_phys->dd_origin_obj, FTAG, &findds);
190 rw_exit(&dp->dp_config_rwlock);
193 dsl_dataset_rele(relds, FTAG);
202 dsl_dataset_rele(relds, FTAG);
206 da.da_ddr.ddr_type = DDR_NONE;
207 da.da_ddr.ddr_first = da.da_ddr.ddr_last = 0;
210 err = traverse_dataset(ds, fromds->ds_phys->ds_creation_txg,
211 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, diff_cb, &da);
216 /* we set the da.da_err we return as side-effect */
217 (void) write_record(&da);