236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
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*/
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#include <sys/dmu.h>
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#include <sys/dmu_impl.h>
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#include <sys/dmu_tx.h>
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#include <sys/dbuf.h>
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#include <sys/dnode.h>
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#include <sys/zfs_context.h>
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#include <sys/dmu_objset.h>
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#include <sys/dmu_traverse.h>
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#include <sys/dsl_dataset.h>
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#include <sys/dsl_dir.h>
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#include <sys/dsl_pool.h>
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#include <sys/dsl_synctask.h>
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#include <sys/zfs_ioctl.h>
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#include <sys/zap.h>
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#include <sys/zio_checksum.h>
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#include <sys/zfs_znode.h>
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struct diffarg {
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struct vnode *da_vp; /* file to which we are reporting */
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offset_t *da_offp;
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int da_err; /* error that stopped diff search */
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dmu_diff_record_t da_ddr;
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};
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static int
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write_record(struct diffarg *da)
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{
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ssize_t resid; /* have to get resid to get detailed errno */
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if (da->da_ddr.ddr_type == DDR_NONE) {
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da->da_err = 0;
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return (0);
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}
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da->da_err = vn_rdwr(UIO_WRITE, da->da_vp, (caddr_t)&da->da_ddr,
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sizeof (da->da_ddr), 0, UIO_SYSSPACE, FAPPEND,
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RLIM64_INFINITY, CRED(), &resid);
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*da->da_offp += sizeof (da->da_ddr);
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return (da->da_err);
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}
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static int
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report_free_dnode_range(struct diffarg *da, uint64_t first, uint64_t last)
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{
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ASSERT(first <= last);
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if (da->da_ddr.ddr_type != DDR_FREE ||
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first != da->da_ddr.ddr_last + 1) {
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if (write_record(da) != 0)
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return (da->da_err);
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da->da_ddr.ddr_type = DDR_FREE;
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da->da_ddr.ddr_first = first;
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da->da_ddr.ddr_last = last;
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return (0);
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}
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da->da_ddr.ddr_last = last;
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return (0);
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}
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static int
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report_dnode(struct diffarg *da, uint64_t object, dnode_phys_t *dnp)
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{
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ASSERT(dnp != NULL);
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if (dnp->dn_type == DMU_OT_NONE)
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return (report_free_dnode_range(da, object, object));
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if (da->da_ddr.ddr_type != DDR_INUSE ||
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object != da->da_ddr.ddr_last + 1) {
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if (write_record(da) != 0)
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return (da->da_err);
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da->da_ddr.ddr_type = DDR_INUSE;
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da->da_ddr.ddr_first = da->da_ddr.ddr_last = object;
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return (0);
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}
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da->da_ddr.ddr_last = object;
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return (0);
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}
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#define DBP_SPAN(dnp, level) \
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(((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \
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(level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT)))
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/* ARGSUSED */
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static int
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diff_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
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const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg)
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{
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struct diffarg *da = arg;
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int err = 0;
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if (issig(JUSTLOOKING) && issig(FORREAL))
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return (SET_ERROR(EINTR));
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if (bp == NULL || zb->zb_object != DMU_META_DNODE_OBJECT)
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return (0);
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if (BP_IS_HOLE(bp)) {
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uint64_t span = DBP_SPAN(dnp, zb->zb_level);
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uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
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err = report_free_dnode_range(da, dnobj,
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dnobj + (span >> DNODE_SHIFT) - 1);
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if (err)
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return (err);
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} else if (zb->zb_level == 0) {
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dnode_phys_t *blk;
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arc_buf_t *abuf;
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arc_flags_t aflags = ARC_FLAG_WAIT;
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int blksz = BP_GET_LSIZE(bp);
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int zio_flags = ZIO_FLAG_CANFAIL;
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int i;
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if (BP_IS_PROTECTED(bp))
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zio_flags |= ZIO_FLAG_RAW;
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if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
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ZIO_PRIORITY_ASYNC_READ, zio_flags, &aflags, zb) != 0)
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return (SET_ERROR(EIO));
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blk = abuf->b_data;
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for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
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uint64_t dnobj = (zb->zb_blkid <<
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(DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
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err = report_dnode(da, dnobj, blk+i);
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if (err)
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break;
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}
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arc_buf_destroy(abuf, &abuf);
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if (err)
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return (err);
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/* Don't care about the data blocks */
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return (TRAVERSE_VISIT_NO_CHILDREN);
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}
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return (0);
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}
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int
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dmu_diff(const char *tosnap_name, const char *fromsnap_name,
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struct vnode *vp, offset_t *offp)
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{
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struct diffarg da;
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dsl_dataset_t *fromsnap;
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dsl_dataset_t *tosnap;
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dsl_pool_t *dp;
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int error;
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uint64_t fromtxg;
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if (strchr(tosnap_name, '@') == NULL ||
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strchr(fromsnap_name, '@') == NULL)
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return (SET_ERROR(EINVAL));
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error = dsl_pool_hold(tosnap_name, FTAG, &dp);
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if (error != 0)
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return (error);
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error = dsl_dataset_hold(dp, tosnap_name, FTAG, &tosnap);
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if (error != 0) {
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dsl_pool_rele(dp, FTAG);
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return (error);
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}
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error = dsl_dataset_hold(dp, fromsnap_name, FTAG, &fromsnap);
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if (error != 0) {
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dsl_dataset_rele(tosnap, FTAG);
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dsl_pool_rele(dp, FTAG);
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return (error);
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}
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if (!dsl_dataset_is_before(tosnap, fromsnap, 0)) {
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dsl_dataset_rele(fromsnap, FTAG);
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dsl_dataset_rele(tosnap, FTAG);
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dsl_pool_rele(dp, FTAG);
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return (SET_ERROR(EXDEV));
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}
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fromtxg = dsl_dataset_phys(fromsnap)->ds_creation_txg;
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dsl_dataset_rele(fromsnap, FTAG);
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dsl_dataset_long_hold(tosnap, FTAG);
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dsl_pool_rele(dp, FTAG);
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da.da_vp = vp;
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da.da_offp = offp;
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da.da_ddr.ddr_type = DDR_NONE;
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da.da_ddr.ddr_first = da.da_ddr.ddr_last = 0;
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da.da_err = 0;
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/*
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* Since zfs diff only looks at dnodes which are stored in plaintext
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* (other than bonus buffers), we don't technically need to decrypt
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* the dataset to perform this operation. However, the command line
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* utility will still fail if the keys are not loaded because the
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* dataset isn't mounted and because it will fail when it attempts to
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* call the ZFS_IOC_OBJ_TO_STATS ioctl.
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*/
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error = traverse_dataset(tosnap, fromtxg,
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TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA | TRAVERSE_NO_DECRYPT,
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diff_cb, &da);
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if (error != 0) {
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da.da_err = error;
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} else {
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/* we set the da.da_err we return as side-effect */
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(void) write_record(&da);
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}
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dsl_dataset_long_rele(tosnap, FTAG);
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dsl_dataset_rele(tosnap, FTAG);
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return (da.da_err);
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}
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