2036 lines
54 KiB
C
2036 lines
54 KiB
C
/*
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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 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/dmu_objset.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_prop.h>
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#include <sys/dsl_synctask.h>
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#include <sys/dmu_traverse.h>
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#include <sys/dmu_tx.h>
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#include <sys/arc.h>
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#include <sys/zio.h>
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#include <sys/zap.h>
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#include <sys/unique.h>
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#include <sys/zfs_context.h>
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#include <sys/zfs_ioctl.h>
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static dsl_checkfunc_t dsl_dataset_destroy_begin_check;
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static dsl_syncfunc_t dsl_dataset_destroy_begin_sync;
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static dsl_checkfunc_t dsl_dataset_rollback_check;
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static dsl_syncfunc_t dsl_dataset_rollback_sync;
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static dsl_checkfunc_t dsl_dataset_destroy_check;
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static dsl_syncfunc_t dsl_dataset_destroy_sync;
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#define DS_REF_MAX (1ULL << 62)
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#define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE
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/*
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* We use weighted reference counts to express the various forms of exclusion
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* between different open modes. A STANDARD open is 1 point, an EXCLUSIVE open
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* is DS_REF_MAX, and a PRIMARY open is little more than half of an EXCLUSIVE.
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* This makes the exclusion logic simple: the total refcnt for all opens cannot
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* exceed DS_REF_MAX. For example, EXCLUSIVE opens are exclusive because their
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* weight (DS_REF_MAX) consumes the entire refcnt space. PRIMARY opens consume
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* just over half of the refcnt space, so there can't be more than one, but it
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* can peacefully coexist with any number of STANDARD opens.
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*/
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static uint64_t ds_refcnt_weight[DS_MODE_LEVELS] = {
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0, /* DS_MODE_NONE - invalid */
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1, /* DS_MODE_STANDARD - unlimited number */
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(DS_REF_MAX >> 1) + 1, /* DS_MODE_PRIMARY - only one of these */
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DS_REF_MAX /* DS_MODE_EXCLUSIVE - no other opens */
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};
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void
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dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
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{
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int used = bp_get_dasize(tx->tx_pool->dp_spa, bp);
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int compressed = BP_GET_PSIZE(bp);
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int uncompressed = BP_GET_UCSIZE(bp);
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dprintf_bp(bp, "born, ds=%p\n", ds);
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ASSERT(dmu_tx_is_syncing(tx));
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/* It could have been compressed away to nothing */
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if (BP_IS_HOLE(bp))
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return;
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ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE);
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ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES);
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if (ds == NULL) {
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/*
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* Account for the meta-objset space in its placeholder
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* dsl_dir.
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*/
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ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */
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dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir,
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used, compressed, uncompressed, tx);
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dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx);
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return;
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}
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dmu_buf_will_dirty(ds->ds_dbuf, tx);
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mutex_enter(&ds->ds_lock);
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ds->ds_phys->ds_used_bytes += used;
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ds->ds_phys->ds_compressed_bytes += compressed;
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ds->ds_phys->ds_uncompressed_bytes += uncompressed;
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ds->ds_phys->ds_unique_bytes += used;
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mutex_exit(&ds->ds_lock);
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dsl_dir_diduse_space(ds->ds_dir,
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used, compressed, uncompressed, tx);
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}
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void
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dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio,
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dmu_tx_t *tx)
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{
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int used = bp_get_dasize(tx->tx_pool->dp_spa, bp);
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int compressed = BP_GET_PSIZE(bp);
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int uncompressed = BP_GET_UCSIZE(bp);
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ASSERT(dmu_tx_is_syncing(tx));
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/* No block pointer => nothing to free */
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if (BP_IS_HOLE(bp))
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return;
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ASSERT(used > 0);
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if (ds == NULL) {
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int err;
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/*
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* Account for the meta-objset space in its placeholder
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* dataset.
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*/
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err = arc_free(pio, tx->tx_pool->dp_spa,
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tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT);
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ASSERT(err == 0);
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dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir,
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-used, -compressed, -uncompressed, tx);
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dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx);
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return;
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}
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ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool);
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dmu_buf_will_dirty(ds->ds_dbuf, tx);
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if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) {
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int err;
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dprintf_bp(bp, "freeing: %s", "");
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err = arc_free(pio, tx->tx_pool->dp_spa,
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tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT);
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ASSERT(err == 0);
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mutex_enter(&ds->ds_lock);
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/* XXX unique_bytes is not accurate for head datasets */
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/* ASSERT3U(ds->ds_phys->ds_unique_bytes, >=, used); */
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ds->ds_phys->ds_unique_bytes -= used;
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mutex_exit(&ds->ds_lock);
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dsl_dir_diduse_space(ds->ds_dir,
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-used, -compressed, -uncompressed, tx);
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} else {
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dprintf_bp(bp, "putting on dead list: %s", "");
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VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx));
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/* if (bp->blk_birth > prev prev snap txg) prev unique += bs */
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if (ds->ds_phys->ds_prev_snap_obj != 0) {
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ASSERT3U(ds->ds_prev->ds_object, ==,
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ds->ds_phys->ds_prev_snap_obj);
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ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0);
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if (ds->ds_prev->ds_phys->ds_next_snap_obj ==
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ds->ds_object && bp->blk_birth >
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ds->ds_prev->ds_phys->ds_prev_snap_txg) {
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dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
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mutex_enter(&ds->ds_prev->ds_lock);
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ds->ds_prev->ds_phys->ds_unique_bytes +=
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used;
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mutex_exit(&ds->ds_prev->ds_lock);
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}
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}
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}
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mutex_enter(&ds->ds_lock);
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ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used);
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ds->ds_phys->ds_used_bytes -= used;
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ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed);
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ds->ds_phys->ds_compressed_bytes -= compressed;
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ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed);
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ds->ds_phys->ds_uncompressed_bytes -= uncompressed;
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mutex_exit(&ds->ds_lock);
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}
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uint64_t
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dsl_dataset_prev_snap_txg(dsl_dataset_t *ds)
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{
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uint64_t trysnap = 0;
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if (ds == NULL)
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return (0);
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/*
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* The snapshot creation could fail, but that would cause an
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* incorrect FALSE return, which would only result in an
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* overestimation of the amount of space that an operation would
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* consume, which is OK.
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*
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* There's also a small window where we could miss a pending
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* snapshot, because we could set the sync task in the quiescing
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* phase. So this should only be used as a guess.
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*/
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if (ds->ds_trysnap_txg >
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spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa))
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trysnap = ds->ds_trysnap_txg;
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return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap));
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}
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int
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dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth)
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{
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return (blk_birth > dsl_dataset_prev_snap_txg(ds));
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}
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/* ARGSUSED */
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static void
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dsl_dataset_evict(dmu_buf_t *db, void *dsv)
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{
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dsl_dataset_t *ds = dsv;
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dsl_pool_t *dp = ds->ds_dir->dd_pool;
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/* open_refcount == DS_REF_MAX when deleting */
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ASSERT(ds->ds_open_refcount == 0 ||
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ds->ds_open_refcount == DS_REF_MAX);
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dprintf_ds(ds, "evicting %s\n", "");
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unique_remove(ds->ds_phys->ds_fsid_guid);
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if (ds->ds_user_ptr != NULL)
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ds->ds_user_evict_func(ds, ds->ds_user_ptr);
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if (ds->ds_prev) {
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dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds);
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ds->ds_prev = NULL;
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}
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bplist_close(&ds->ds_deadlist);
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dsl_dir_close(ds->ds_dir, ds);
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if (list_link_active(&ds->ds_synced_link))
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list_remove(&dp->dp_synced_objsets, ds);
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mutex_destroy(&ds->ds_lock);
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mutex_destroy(&ds->ds_deadlist.bpl_lock);
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kmem_free(ds, sizeof (dsl_dataset_t));
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}
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static int
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dsl_dataset_get_snapname(dsl_dataset_t *ds)
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{
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dsl_dataset_phys_t *headphys;
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int err;
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dmu_buf_t *headdbuf;
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dsl_pool_t *dp = ds->ds_dir->dd_pool;
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objset_t *mos = dp->dp_meta_objset;
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if (ds->ds_snapname[0])
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return (0);
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if (ds->ds_phys->ds_next_snap_obj == 0)
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return (0);
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err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj,
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FTAG, &headdbuf);
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if (err)
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return (err);
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headphys = headdbuf->db_data;
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err = zap_value_search(dp->dp_meta_objset,
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headphys->ds_snapnames_zapobj, ds->ds_object, ds->ds_snapname);
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dmu_buf_rele(headdbuf, FTAG);
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return (err);
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}
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int
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dsl_dataset_open_obj(dsl_pool_t *dp, uint64_t dsobj, const char *snapname,
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int mode, void *tag, dsl_dataset_t **dsp)
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{
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uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)];
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objset_t *mos = dp->dp_meta_objset;
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dmu_buf_t *dbuf;
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dsl_dataset_t *ds;
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int err;
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ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) ||
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dsl_pool_sync_context(dp));
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err = dmu_bonus_hold(mos, dsobj, tag, &dbuf);
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if (err)
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return (err);
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ds = dmu_buf_get_user(dbuf);
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if (ds == NULL) {
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dsl_dataset_t *winner;
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ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP);
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ds->ds_dbuf = dbuf;
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ds->ds_object = dsobj;
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ds->ds_phys = dbuf->db_data;
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mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL);
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mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT,
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NULL);
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err = bplist_open(&ds->ds_deadlist,
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mos, ds->ds_phys->ds_deadlist_obj);
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if (err == 0) {
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err = dsl_dir_open_obj(dp,
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ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir);
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}
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if (err) {
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/*
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* we don't really need to close the blist if we
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* just opened it.
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*/
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mutex_destroy(&ds->ds_lock);
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mutex_destroy(&ds->ds_deadlist.bpl_lock);
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kmem_free(ds, sizeof (dsl_dataset_t));
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dmu_buf_rele(dbuf, tag);
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return (err);
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}
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if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) {
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ds->ds_snapname[0] = '\0';
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if (ds->ds_phys->ds_prev_snap_obj) {
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err = dsl_dataset_open_obj(dp,
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ds->ds_phys->ds_prev_snap_obj, NULL,
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DS_MODE_NONE, ds, &ds->ds_prev);
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}
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} else {
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if (snapname) {
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#ifdef ZFS_DEBUG
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dsl_dataset_phys_t *headphys;
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dmu_buf_t *headdbuf;
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err = dmu_bonus_hold(mos,
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ds->ds_dir->dd_phys->dd_head_dataset_obj,
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FTAG, &headdbuf);
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if (err == 0) {
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headphys = headdbuf->db_data;
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uint64_t foundobj;
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err = zap_lookup(dp->dp_meta_objset,
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headphys->ds_snapnames_zapobj,
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snapname, sizeof (foundobj), 1,
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&foundobj);
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ASSERT3U(foundobj, ==, dsobj);
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dmu_buf_rele(headdbuf, FTAG);
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}
|
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#endif
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(void) strcat(ds->ds_snapname, snapname);
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} else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) {
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err = dsl_dataset_get_snapname(ds);
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}
|
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}
|
|
|
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if (err == 0) {
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winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys,
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dsl_dataset_evict);
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}
|
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if (err || winner) {
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bplist_close(&ds->ds_deadlist);
|
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if (ds->ds_prev) {
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dsl_dataset_close(ds->ds_prev,
|
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DS_MODE_NONE, ds);
|
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}
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dsl_dir_close(ds->ds_dir, ds);
|
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mutex_destroy(&ds->ds_lock);
|
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mutex_destroy(&ds->ds_deadlist.bpl_lock);
|
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kmem_free(ds, sizeof (dsl_dataset_t));
|
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if (err) {
|
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dmu_buf_rele(dbuf, tag);
|
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return (err);
|
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}
|
|
ds = winner;
|
|
} else {
|
|
uint64_t new =
|
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unique_insert(ds->ds_phys->ds_fsid_guid);
|
|
if (new != ds->ds_phys->ds_fsid_guid) {
|
|
/* XXX it won't necessarily be synced... */
|
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ds->ds_phys->ds_fsid_guid = new;
|
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}
|
|
}
|
|
}
|
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ASSERT3P(ds->ds_dbuf, ==, dbuf);
|
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ASSERT3P(ds->ds_phys, ==, dbuf->db_data);
|
|
|
|
mutex_enter(&ds->ds_lock);
|
|
if ((DS_MODE_LEVEL(mode) == DS_MODE_PRIMARY &&
|
|
(ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) &&
|
|
!DS_MODE_IS_INCONSISTENT(mode)) ||
|
|
(ds->ds_open_refcount + weight > DS_REF_MAX)) {
|
|
mutex_exit(&ds->ds_lock);
|
|
dsl_dataset_close(ds, DS_MODE_NONE, tag);
|
|
return (EBUSY);
|
|
}
|
|
ds->ds_open_refcount += weight;
|
|
mutex_exit(&ds->ds_lock);
|
|
|
|
*dsp = ds;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
dsl_dataset_open_spa(spa_t *spa, const char *name, int mode,
|
|
void *tag, dsl_dataset_t **dsp)
|
|
{
|
|
dsl_dir_t *dd;
|
|
dsl_pool_t *dp;
|
|
const char *tail;
|
|
uint64_t obj;
|
|
dsl_dataset_t *ds = NULL;
|
|
int err = 0;
|
|
|
|
err = dsl_dir_open_spa(spa, name, FTAG, &dd, &tail);
|
|
if (err)
|
|
return (err);
|
|
|
|
dp = dd->dd_pool;
|
|
obj = dd->dd_phys->dd_head_dataset_obj;
|
|
rw_enter(&dp->dp_config_rwlock, RW_READER);
|
|
if (obj == 0) {
|
|
/* A dataset with no associated objset */
|
|
err = ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
if (tail != NULL) {
|
|
objset_t *mos = dp->dp_meta_objset;
|
|
|
|
err = dsl_dataset_open_obj(dp, obj, NULL,
|
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DS_MODE_NONE, tag, &ds);
|
|
if (err)
|
|
goto out;
|
|
obj = ds->ds_phys->ds_snapnames_zapobj;
|
|
dsl_dataset_close(ds, DS_MODE_NONE, tag);
|
|
ds = NULL;
|
|
|
|
if (tail[0] != '@') {
|
|
err = ENOENT;
|
|
goto out;
|
|
}
|
|
tail++;
|
|
|
|
/* Look for a snapshot */
|
|
if (!DS_MODE_IS_READONLY(mode)) {
|
|
err = EROFS;
|
|
goto out;
|
|
}
|
|
dprintf("looking for snapshot '%s'\n", tail);
|
|
err = zap_lookup(mos, obj, tail, 8, 1, &obj);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = dsl_dataset_open_obj(dp, obj, tail, mode, tag, &ds);
|
|
|
|
out:
|
|
rw_exit(&dp->dp_config_rwlock);
|
|
dsl_dir_close(dd, FTAG);
|
|
|
|
ASSERT3U((err == 0), ==, (ds != NULL));
|
|
/* ASSERT(ds == NULL || strcmp(name, ds->ds_name) == 0); */
|
|
|
|
*dsp = ds;
|
|
return (err);
|
|
}
|
|
|
|
int
|
|
dsl_dataset_open(const char *name, int mode, void *tag, dsl_dataset_t **dsp)
|
|
{
|
|
return (dsl_dataset_open_spa(NULL, name, mode, tag, dsp));
|
|
}
|
|
|
|
void
|
|
dsl_dataset_name(dsl_dataset_t *ds, char *name)
|
|
{
|
|
if (ds == NULL) {
|
|
(void) strcpy(name, "mos");
|
|
} else {
|
|
dsl_dir_name(ds->ds_dir, name);
|
|
VERIFY(0 == dsl_dataset_get_snapname(ds));
|
|
if (ds->ds_snapname[0]) {
|
|
(void) strcat(name, "@");
|
|
if (!MUTEX_HELD(&ds->ds_lock)) {
|
|
/*
|
|
* We use a "recursive" mutex so that we
|
|
* can call dprintf_ds() with ds_lock held.
|
|
*/
|
|
mutex_enter(&ds->ds_lock);
|
|
(void) strcat(name, ds->ds_snapname);
|
|
mutex_exit(&ds->ds_lock);
|
|
} else {
|
|
(void) strcat(name, ds->ds_snapname);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
dsl_dataset_namelen(dsl_dataset_t *ds)
|
|
{
|
|
int result;
|
|
|
|
if (ds == NULL) {
|
|
result = 3; /* "mos" */
|
|
} else {
|
|
result = dsl_dir_namelen(ds->ds_dir);
|
|
VERIFY(0 == dsl_dataset_get_snapname(ds));
|
|
if (ds->ds_snapname[0]) {
|
|
++result; /* adding one for the @-sign */
|
|
if (!MUTEX_HELD(&ds->ds_lock)) {
|
|
/* see dsl_datset_name */
|
|
mutex_enter(&ds->ds_lock);
|
|
result += strlen(ds->ds_snapname);
|
|
mutex_exit(&ds->ds_lock);
|
|
} else {
|
|
result += strlen(ds->ds_snapname);
|
|
}
|
|
}
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
void
|
|
dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag)
|
|
{
|
|
uint64_t weight = ds_refcnt_weight[DS_MODE_LEVEL(mode)];
|
|
mutex_enter(&ds->ds_lock);
|
|
ASSERT3U(ds->ds_open_refcount, >=, weight);
|
|
ds->ds_open_refcount -= weight;
|
|
dprintf_ds(ds, "closing mode %u refcount now 0x%llx\n",
|
|
mode, ds->ds_open_refcount);
|
|
mutex_exit(&ds->ds_lock);
|
|
|
|
dmu_buf_rele(ds->ds_dbuf, tag);
|
|
}
|
|
|
|
void
|
|
dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx)
|
|
{
|
|
objset_t *mos = dp->dp_meta_objset;
|
|
dmu_buf_t *dbuf;
|
|
dsl_dataset_phys_t *dsphys;
|
|
dsl_dataset_t *ds;
|
|
uint64_t dsobj;
|
|
dsl_dir_t *dd;
|
|
|
|
dsl_dir_create_root(mos, ddobjp, tx);
|
|
VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd));
|
|
|
|
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
|
|
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
|
|
VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
|
|
dmu_buf_will_dirty(dbuf, tx);
|
|
dsphys = dbuf->db_data;
|
|
dsphys->ds_dir_obj = dd->dd_object;
|
|
dsphys->ds_fsid_guid = unique_create();
|
|
unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */
|
|
(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
|
|
sizeof (dsphys->ds_guid));
|
|
dsphys->ds_snapnames_zapobj =
|
|
zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx);
|
|
dsphys->ds_creation_time = gethrestime_sec();
|
|
dsphys->ds_creation_txg = tx->tx_txg;
|
|
dsphys->ds_deadlist_obj =
|
|
bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx);
|
|
dmu_buf_rele(dbuf, FTAG);
|
|
|
|
dmu_buf_will_dirty(dd->dd_dbuf, tx);
|
|
dd->dd_phys->dd_head_dataset_obj = dsobj;
|
|
dsl_dir_close(dd, FTAG);
|
|
|
|
VERIFY(0 ==
|
|
dsl_dataset_open_obj(dp, dsobj, NULL, DS_MODE_NONE, FTAG, &ds));
|
|
(void) dmu_objset_create_impl(dp->dp_spa, ds,
|
|
&ds->ds_phys->ds_bp, DMU_OST_ZFS, tx);
|
|
dsl_dataset_close(ds, DS_MODE_NONE, FTAG);
|
|
}
|
|
|
|
uint64_t
|
|
dsl_dataset_create_sync(dsl_dir_t *pdd,
|
|
const char *lastname, dsl_dataset_t *clone_parent, dmu_tx_t *tx)
|
|
{
|
|
dsl_pool_t *dp = pdd->dd_pool;
|
|
dmu_buf_t *dbuf;
|
|
dsl_dataset_phys_t *dsphys;
|
|
uint64_t dsobj, ddobj;
|
|
objset_t *mos = dp->dp_meta_objset;
|
|
dsl_dir_t *dd;
|
|
|
|
ASSERT(clone_parent == NULL || clone_parent->ds_dir->dd_pool == dp);
|
|
ASSERT(clone_parent == NULL ||
|
|
clone_parent->ds_phys->ds_num_children > 0);
|
|
ASSERT(lastname[0] != '@');
|
|
ASSERT(dmu_tx_is_syncing(tx));
|
|
|
|
ddobj = dsl_dir_create_sync(pdd, lastname, tx);
|
|
VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd));
|
|
|
|
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
|
|
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
|
|
VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
|
|
dmu_buf_will_dirty(dbuf, tx);
|
|
dsphys = dbuf->db_data;
|
|
dsphys->ds_dir_obj = dd->dd_object;
|
|
dsphys->ds_fsid_guid = unique_create();
|
|
unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */
|
|
(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
|
|
sizeof (dsphys->ds_guid));
|
|
dsphys->ds_snapnames_zapobj =
|
|
zap_create(mos, DMU_OT_DSL_DS_SNAP_MAP, DMU_OT_NONE, 0, tx);
|
|
dsphys->ds_creation_time = gethrestime_sec();
|
|
dsphys->ds_creation_txg = tx->tx_txg;
|
|
dsphys->ds_deadlist_obj =
|
|
bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx);
|
|
if (clone_parent) {
|
|
dsphys->ds_prev_snap_obj = clone_parent->ds_object;
|
|
dsphys->ds_prev_snap_txg =
|
|
clone_parent->ds_phys->ds_creation_txg;
|
|
dsphys->ds_used_bytes =
|
|
clone_parent->ds_phys->ds_used_bytes;
|
|
dsphys->ds_compressed_bytes =
|
|
clone_parent->ds_phys->ds_compressed_bytes;
|
|
dsphys->ds_uncompressed_bytes =
|
|
clone_parent->ds_phys->ds_uncompressed_bytes;
|
|
dsphys->ds_bp = clone_parent->ds_phys->ds_bp;
|
|
|
|
dmu_buf_will_dirty(clone_parent->ds_dbuf, tx);
|
|
clone_parent->ds_phys->ds_num_children++;
|
|
|
|
dmu_buf_will_dirty(dd->dd_dbuf, tx);
|
|
dd->dd_phys->dd_clone_parent_obj = clone_parent->ds_object;
|
|
}
|
|
dmu_buf_rele(dbuf, FTAG);
|
|
|
|
dmu_buf_will_dirty(dd->dd_dbuf, tx);
|
|
dd->dd_phys->dd_head_dataset_obj = dsobj;
|
|
dsl_dir_close(dd, FTAG);
|
|
|
|
return (dsobj);
|
|
}
|
|
|
|
struct destroyarg {
|
|
dsl_sync_task_group_t *dstg;
|
|
char *snapname;
|
|
char *failed;
|
|
};
|
|
|
|
static int
|
|
dsl_snapshot_destroy_one(char *name, void *arg)
|
|
{
|
|
struct destroyarg *da = arg;
|
|
dsl_dataset_t *ds;
|
|
char *cp;
|
|
int err;
|
|
|
|
(void) strcat(name, "@");
|
|
(void) strcat(name, da->snapname);
|
|
err = dsl_dataset_open(name,
|
|
DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT,
|
|
da->dstg, &ds);
|
|
cp = strchr(name, '@');
|
|
*cp = '\0';
|
|
if (err == ENOENT)
|
|
return (0);
|
|
if (err) {
|
|
(void) strcpy(da->failed, name);
|
|
return (err);
|
|
}
|
|
|
|
dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check,
|
|
dsl_dataset_destroy_sync, ds, da->dstg, 0);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Destroy 'snapname' in all descendants of 'fsname'.
|
|
*/
|
|
#pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy
|
|
int
|
|
dsl_snapshots_destroy(char *fsname, char *snapname)
|
|
{
|
|
int err;
|
|
struct destroyarg da;
|
|
dsl_sync_task_t *dst;
|
|
spa_t *spa;
|
|
char *cp;
|
|
|
|
cp = strchr(fsname, '/');
|
|
if (cp) {
|
|
*cp = '\0';
|
|
err = spa_open(fsname, &spa, FTAG);
|
|
*cp = '/';
|
|
} else {
|
|
err = spa_open(fsname, &spa, FTAG);
|
|
}
|
|
if (err)
|
|
return (err);
|
|
da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
|
|
da.snapname = snapname;
|
|
da.failed = fsname;
|
|
|
|
err = dmu_objset_find(fsname,
|
|
dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN);
|
|
|
|
if (err == 0)
|
|
err = dsl_sync_task_group_wait(da.dstg);
|
|
|
|
for (dst = list_head(&da.dstg->dstg_tasks); dst;
|
|
dst = list_next(&da.dstg->dstg_tasks, dst)) {
|
|
dsl_dataset_t *ds = dst->dst_arg1;
|
|
if (dst->dst_err) {
|
|
dsl_dataset_name(ds, fsname);
|
|
cp = strchr(fsname, '@');
|
|
*cp = '\0';
|
|
}
|
|
/*
|
|
* If it was successful, destroy_sync would have
|
|
* closed the ds
|
|
*/
|
|
if (err)
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, da.dstg);
|
|
}
|
|
|
|
dsl_sync_task_group_destroy(da.dstg);
|
|
spa_close(spa, FTAG);
|
|
return (err);
|
|
}
|
|
|
|
int
|
|
dsl_dataset_destroy(const char *name)
|
|
{
|
|
int err;
|
|
dsl_sync_task_group_t *dstg;
|
|
objset_t *os;
|
|
dsl_dataset_t *ds;
|
|
dsl_dir_t *dd;
|
|
uint64_t obj;
|
|
|
|
if (strchr(name, '@')) {
|
|
/* Destroying a snapshot is simpler */
|
|
err = dsl_dataset_open(name,
|
|
DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT,
|
|
FTAG, &ds);
|
|
if (err)
|
|
return (err);
|
|
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
|
|
dsl_dataset_destroy_check, dsl_dataset_destroy_sync,
|
|
ds, FTAG, 0);
|
|
if (err)
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
return (err);
|
|
}
|
|
|
|
err = dmu_objset_open(name, DMU_OST_ANY,
|
|
DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os);
|
|
if (err)
|
|
return (err);
|
|
ds = os->os->os_dsl_dataset;
|
|
dd = ds->ds_dir;
|
|
|
|
/*
|
|
* Check for errors and mark this ds as inconsistent, in
|
|
* case we crash while freeing the objects.
|
|
*/
|
|
err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check,
|
|
dsl_dataset_destroy_begin_sync, ds, NULL, 0);
|
|
if (err) {
|
|
dmu_objset_close(os);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* remove the objects in open context, so that we won't
|
|
* have too much to do in syncing context.
|
|
*/
|
|
for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE,
|
|
ds->ds_phys->ds_prev_snap_txg)) {
|
|
dmu_tx_t *tx = dmu_tx_create(os);
|
|
dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END);
|
|
dmu_tx_hold_bonus(tx, obj);
|
|
err = dmu_tx_assign(tx, TXG_WAIT);
|
|
if (err) {
|
|
/*
|
|
* Perhaps there is not enough disk
|
|
* space. Just deal with it from
|
|
* dsl_dataset_destroy_sync().
|
|
*/
|
|
dmu_tx_abort(tx);
|
|
continue;
|
|
}
|
|
VERIFY(0 == dmu_object_free(os, obj, tx));
|
|
dmu_tx_commit(tx);
|
|
}
|
|
/* Make sure it's not dirty before we finish destroying it. */
|
|
txg_wait_synced(dd->dd_pool, 0);
|
|
|
|
dmu_objset_close(os);
|
|
if (err != ESRCH)
|
|
return (err);
|
|
|
|
err = dsl_dataset_open(name,
|
|
DS_MODE_EXCLUSIVE | DS_MODE_READONLY | DS_MODE_INCONSISTENT,
|
|
FTAG, &ds);
|
|
if (err)
|
|
return (err);
|
|
|
|
err = dsl_dir_open(name, FTAG, &dd, NULL);
|
|
if (err) {
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Blow away the dsl_dir + head dataset.
|
|
*/
|
|
dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool);
|
|
dsl_sync_task_create(dstg, dsl_dataset_destroy_check,
|
|
dsl_dataset_destroy_sync, ds, FTAG, 0);
|
|
dsl_sync_task_create(dstg, dsl_dir_destroy_check,
|
|
dsl_dir_destroy_sync, dd, FTAG, 0);
|
|
err = dsl_sync_task_group_wait(dstg);
|
|
dsl_sync_task_group_destroy(dstg);
|
|
/* if it is successful, *destroy_sync will close the ds+dd */
|
|
if (err) {
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
dsl_dir_close(dd, FTAG);
|
|
}
|
|
return (err);
|
|
}
|
|
|
|
int
|
|
dsl_dataset_rollback(dsl_dataset_t *ds)
|
|
{
|
|
ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX);
|
|
return (dsl_sync_task_do(ds->ds_dir->dd_pool,
|
|
dsl_dataset_rollback_check, dsl_dataset_rollback_sync,
|
|
ds, NULL, 0));
|
|
}
|
|
|
|
void *
|
|
dsl_dataset_set_user_ptr(dsl_dataset_t *ds,
|
|
void *p, dsl_dataset_evict_func_t func)
|
|
{
|
|
void *old;
|
|
|
|
mutex_enter(&ds->ds_lock);
|
|
old = ds->ds_user_ptr;
|
|
if (old == NULL) {
|
|
ds->ds_user_ptr = p;
|
|
ds->ds_user_evict_func = func;
|
|
}
|
|
mutex_exit(&ds->ds_lock);
|
|
return (old);
|
|
}
|
|
|
|
void *
|
|
dsl_dataset_get_user_ptr(dsl_dataset_t *ds)
|
|
{
|
|
return (ds->ds_user_ptr);
|
|
}
|
|
|
|
|
|
blkptr_t *
|
|
dsl_dataset_get_blkptr(dsl_dataset_t *ds)
|
|
{
|
|
return (&ds->ds_phys->ds_bp);
|
|
}
|
|
|
|
void
|
|
dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx)
|
|
{
|
|
ASSERT(dmu_tx_is_syncing(tx));
|
|
/* If it's the meta-objset, set dp_meta_rootbp */
|
|
if (ds == NULL) {
|
|
tx->tx_pool->dp_meta_rootbp = *bp;
|
|
} else {
|
|
dmu_buf_will_dirty(ds->ds_dbuf, tx);
|
|
ds->ds_phys->ds_bp = *bp;
|
|
}
|
|
}
|
|
|
|
spa_t *
|
|
dsl_dataset_get_spa(dsl_dataset_t *ds)
|
|
{
|
|
return (ds->ds_dir->dd_pool->dp_spa);
|
|
}
|
|
|
|
void
|
|
dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx)
|
|
{
|
|
dsl_pool_t *dp;
|
|
|
|
if (ds == NULL) /* this is the meta-objset */
|
|
return;
|
|
|
|
ASSERT(ds->ds_user_ptr != NULL);
|
|
|
|
if (ds->ds_phys->ds_next_snap_obj != 0)
|
|
panic("dirtying snapshot!");
|
|
|
|
dp = ds->ds_dir->dd_pool;
|
|
|
|
if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) {
|
|
/* up the hold count until we can be written out */
|
|
dmu_buf_add_ref(ds->ds_dbuf, ds);
|
|
}
|
|
}
|
|
|
|
struct killarg {
|
|
uint64_t *usedp;
|
|
uint64_t *compressedp;
|
|
uint64_t *uncompressedp;
|
|
zio_t *zio;
|
|
dmu_tx_t *tx;
|
|
};
|
|
|
|
static int
|
|
kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg)
|
|
{
|
|
struct killarg *ka = arg;
|
|
blkptr_t *bp = &bc->bc_blkptr;
|
|
|
|
ASSERT3U(bc->bc_errno, ==, 0);
|
|
|
|
/*
|
|
* Since this callback is not called concurrently, no lock is
|
|
* needed on the accounting values.
|
|
*/
|
|
*ka->usedp += bp_get_dasize(spa, bp);
|
|
*ka->compressedp += BP_GET_PSIZE(bp);
|
|
*ka->uncompressedp += BP_GET_UCSIZE(bp);
|
|
/* XXX check for EIO? */
|
|
(void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL,
|
|
ARC_NOWAIT);
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
|
|
/*
|
|
* There must be a previous snapshot. I suppose we could roll
|
|
* it back to being empty (and re-initialize the upper (ZPL)
|
|
* layer). But for now there's no way to do this via the user
|
|
* interface.
|
|
*/
|
|
if (ds->ds_phys->ds_prev_snap_txg == 0)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* This must not be a snapshot.
|
|
*/
|
|
if (ds->ds_phys->ds_next_snap_obj != 0)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* If we made changes this txg, traverse_dsl_dataset won't find
|
|
* them. Try again.
|
|
*/
|
|
if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg)
|
|
return (EAGAIN);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
dsl_dataset_rollback_sync(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
|
|
|
|
dmu_buf_will_dirty(ds->ds_dbuf, tx);
|
|
|
|
/* Zero out the deadlist. */
|
|
bplist_close(&ds->ds_deadlist);
|
|
bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx);
|
|
ds->ds_phys->ds_deadlist_obj =
|
|
bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx);
|
|
VERIFY(0 == bplist_open(&ds->ds_deadlist, mos,
|
|
ds->ds_phys->ds_deadlist_obj));
|
|
|
|
{
|
|
/* Free blkptrs that we gave birth to */
|
|
zio_t *zio;
|
|
uint64_t used = 0, compressed = 0, uncompressed = 0;
|
|
struct killarg ka;
|
|
|
|
zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL,
|
|
ZIO_FLAG_MUSTSUCCEED);
|
|
ka.usedp = &used;
|
|
ka.compressedp = &compressed;
|
|
ka.uncompressedp = &uncompressed;
|
|
ka.zio = zio;
|
|
ka.tx = tx;
|
|
(void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg,
|
|
ADVANCE_POST, kill_blkptr, &ka);
|
|
(void) zio_wait(zio);
|
|
|
|
dsl_dir_diduse_space(ds->ds_dir,
|
|
-used, -compressed, -uncompressed, tx);
|
|
}
|
|
|
|
/* Change our contents to that of the prev snapshot */
|
|
ASSERT3U(ds->ds_prev->ds_object, ==, ds->ds_phys->ds_prev_snap_obj);
|
|
ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp;
|
|
ds->ds_phys->ds_used_bytes = ds->ds_prev->ds_phys->ds_used_bytes;
|
|
ds->ds_phys->ds_compressed_bytes =
|
|
ds->ds_prev->ds_phys->ds_compressed_bytes;
|
|
ds->ds_phys->ds_uncompressed_bytes =
|
|
ds->ds_prev->ds_phys->ds_uncompressed_bytes;
|
|
ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags;
|
|
ds->ds_phys->ds_unique_bytes = 0;
|
|
|
|
if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) {
|
|
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
|
|
ds->ds_prev->ds_phys->ds_unique_bytes = 0;
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
|
|
/*
|
|
* Can't delete a head dataset if there are snapshots of it.
|
|
* (Except if the only snapshots are from the branch we cloned
|
|
* from.)
|
|
*/
|
|
if (ds->ds_prev != NULL &&
|
|
ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
|
|
return (EINVAL);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
|
|
/* Mark it as inconsistent on-disk, in case we crash */
|
|
dmu_buf_will_dirty(ds->ds_dbuf, tx);
|
|
ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
|
|
/* Can't delete a branch point. */
|
|
if (ds->ds_phys->ds_num_children > 1)
|
|
return (EEXIST);
|
|
|
|
/*
|
|
* Can't delete a head dataset if there are snapshots of it.
|
|
* (Except if the only snapshots are from the branch we cloned
|
|
* from.)
|
|
*/
|
|
if (ds->ds_prev != NULL &&
|
|
ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* If we made changes this txg, traverse_dsl_dataset won't find
|
|
* them. Try again.
|
|
*/
|
|
if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg)
|
|
return (EAGAIN);
|
|
|
|
/* XXX we should do some i/o error checking... */
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
dsl_dataset_destroy_sync(void *arg1, void *tag, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
uint64_t used = 0, compressed = 0, uncompressed = 0;
|
|
zio_t *zio;
|
|
int err;
|
|
int after_branch_point = FALSE;
|
|
dsl_pool_t *dp = ds->ds_dir->dd_pool;
|
|
objset_t *mos = dp->dp_meta_objset;
|
|
dsl_dataset_t *ds_prev = NULL;
|
|
uint64_t obj;
|
|
|
|
ASSERT3U(ds->ds_open_refcount, ==, DS_REF_MAX);
|
|
ASSERT3U(ds->ds_phys->ds_num_children, <=, 1);
|
|
ASSERT(ds->ds_prev == NULL ||
|
|
ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object);
|
|
ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg);
|
|
|
|
ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
|
|
|
|
obj = ds->ds_object;
|
|
|
|
if (ds->ds_phys->ds_prev_snap_obj != 0) {
|
|
if (ds->ds_prev) {
|
|
ds_prev = ds->ds_prev;
|
|
} else {
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds->ds_phys->ds_prev_snap_obj, NULL,
|
|
DS_MODE_NONE, FTAG, &ds_prev));
|
|
}
|
|
after_branch_point =
|
|
(ds_prev->ds_phys->ds_next_snap_obj != obj);
|
|
|
|
dmu_buf_will_dirty(ds_prev->ds_dbuf, tx);
|
|
if (after_branch_point &&
|
|
ds->ds_phys->ds_next_snap_obj == 0) {
|
|
/* This clone is toast. */
|
|
ASSERT(ds_prev->ds_phys->ds_num_children > 1);
|
|
ds_prev->ds_phys->ds_num_children--;
|
|
} else if (!after_branch_point) {
|
|
ds_prev->ds_phys->ds_next_snap_obj =
|
|
ds->ds_phys->ds_next_snap_obj;
|
|
}
|
|
}
|
|
|
|
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
|
|
|
|
if (ds->ds_phys->ds_next_snap_obj != 0) {
|
|
blkptr_t bp;
|
|
dsl_dataset_t *ds_next;
|
|
uint64_t itor = 0;
|
|
|
|
spa_scrub_restart(dp->dp_spa, tx->tx_txg);
|
|
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds->ds_phys->ds_next_snap_obj, NULL,
|
|
DS_MODE_NONE, FTAG, &ds_next));
|
|
ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj);
|
|
|
|
dmu_buf_will_dirty(ds_next->ds_dbuf, tx);
|
|
ds_next->ds_phys->ds_prev_snap_obj =
|
|
ds->ds_phys->ds_prev_snap_obj;
|
|
ds_next->ds_phys->ds_prev_snap_txg =
|
|
ds->ds_phys->ds_prev_snap_txg;
|
|
ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
|
|
ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0);
|
|
|
|
/*
|
|
* Transfer to our deadlist (which will become next's
|
|
* new deadlist) any entries from next's current
|
|
* deadlist which were born before prev, and free the
|
|
* other entries.
|
|
*
|
|
* XXX we're doing this long task with the config lock held
|
|
*/
|
|
while (bplist_iterate(&ds_next->ds_deadlist, &itor,
|
|
&bp) == 0) {
|
|
if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) {
|
|
VERIFY(0 == bplist_enqueue(&ds->ds_deadlist,
|
|
&bp, tx));
|
|
if (ds_prev && !after_branch_point &&
|
|
bp.blk_birth >
|
|
ds_prev->ds_phys->ds_prev_snap_txg) {
|
|
ds_prev->ds_phys->ds_unique_bytes +=
|
|
bp_get_dasize(dp->dp_spa, &bp);
|
|
}
|
|
} else {
|
|
used += bp_get_dasize(dp->dp_spa, &bp);
|
|
compressed += BP_GET_PSIZE(&bp);
|
|
uncompressed += BP_GET_UCSIZE(&bp);
|
|
/* XXX check return value? */
|
|
(void) arc_free(zio, dp->dp_spa, tx->tx_txg,
|
|
&bp, NULL, NULL, ARC_NOWAIT);
|
|
}
|
|
}
|
|
|
|
/* free next's deadlist */
|
|
bplist_close(&ds_next->ds_deadlist);
|
|
bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx);
|
|
|
|
/* set next's deadlist to our deadlist */
|
|
ds_next->ds_phys->ds_deadlist_obj =
|
|
ds->ds_phys->ds_deadlist_obj;
|
|
VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos,
|
|
ds_next->ds_phys->ds_deadlist_obj));
|
|
ds->ds_phys->ds_deadlist_obj = 0;
|
|
|
|
if (ds_next->ds_phys->ds_next_snap_obj != 0) {
|
|
/*
|
|
* Update next's unique to include blocks which
|
|
* were previously shared by only this snapshot
|
|
* and it. Those blocks will be born after the
|
|
* prev snap and before this snap, and will have
|
|
* died after the next snap and before the one
|
|
* after that (ie. be on the snap after next's
|
|
* deadlist).
|
|
*
|
|
* XXX we're doing this long task with the
|
|
* config lock held
|
|
*/
|
|
dsl_dataset_t *ds_after_next;
|
|
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds_next->ds_phys->ds_next_snap_obj, NULL,
|
|
DS_MODE_NONE, FTAG, &ds_after_next));
|
|
itor = 0;
|
|
while (bplist_iterate(&ds_after_next->ds_deadlist,
|
|
&itor, &bp) == 0) {
|
|
if (bp.blk_birth >
|
|
ds->ds_phys->ds_prev_snap_txg &&
|
|
bp.blk_birth <=
|
|
ds->ds_phys->ds_creation_txg) {
|
|
ds_next->ds_phys->ds_unique_bytes +=
|
|
bp_get_dasize(dp->dp_spa, &bp);
|
|
}
|
|
}
|
|
|
|
dsl_dataset_close(ds_after_next, DS_MODE_NONE, FTAG);
|
|
ASSERT3P(ds_next->ds_prev, ==, NULL);
|
|
} else {
|
|
/*
|
|
* It would be nice to update the head dataset's
|
|
* unique. To do so we would have to traverse
|
|
* it for blocks born after ds_prev, which is
|
|
* pretty expensive just to maintain something
|
|
* for debugging purposes.
|
|
*/
|
|
ASSERT3P(ds_next->ds_prev, ==, ds);
|
|
dsl_dataset_close(ds_next->ds_prev, DS_MODE_NONE,
|
|
ds_next);
|
|
if (ds_prev) {
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds->ds_phys->ds_prev_snap_obj, NULL,
|
|
DS_MODE_NONE, ds_next, &ds_next->ds_prev));
|
|
} else {
|
|
ds_next->ds_prev = NULL;
|
|
}
|
|
}
|
|
dsl_dataset_close(ds_next, DS_MODE_NONE, FTAG);
|
|
|
|
/*
|
|
* NB: unique_bytes is not accurate for head objsets
|
|
* because we don't update it when we delete the most
|
|
* recent snapshot -- see above comment.
|
|
*/
|
|
ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes);
|
|
} else {
|
|
/*
|
|
* There's no next snapshot, so this is a head dataset.
|
|
* Destroy the deadlist. Unless it's a clone, the
|
|
* deadlist should be empty. (If it's a clone, it's
|
|
* safe to ignore the deadlist contents.)
|
|
*/
|
|
struct killarg ka;
|
|
|
|
ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist));
|
|
bplist_close(&ds->ds_deadlist);
|
|
bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx);
|
|
ds->ds_phys->ds_deadlist_obj = 0;
|
|
|
|
/*
|
|
* Free everything that we point to (that's born after
|
|
* the previous snapshot, if we are a clone)
|
|
*
|
|
* XXX we're doing this long task with the config lock held
|
|
*/
|
|
ka.usedp = &used;
|
|
ka.compressedp = &compressed;
|
|
ka.uncompressedp = &uncompressed;
|
|
ka.zio = zio;
|
|
ka.tx = tx;
|
|
err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg,
|
|
ADVANCE_POST, kill_blkptr, &ka);
|
|
ASSERT3U(err, ==, 0);
|
|
}
|
|
|
|
err = zio_wait(zio);
|
|
ASSERT3U(err, ==, 0);
|
|
|
|
dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx);
|
|
|
|
if (ds->ds_phys->ds_snapnames_zapobj) {
|
|
err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx);
|
|
ASSERT(err == 0);
|
|
}
|
|
|
|
if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) {
|
|
/* Erase the link in the dataset */
|
|
dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
|
|
ds->ds_dir->dd_phys->dd_head_dataset_obj = 0;
|
|
/*
|
|
* dsl_dir_sync_destroy() called us, they'll destroy
|
|
* the dataset.
|
|
*/
|
|
} else {
|
|
/* remove from snapshot namespace */
|
|
dsl_dataset_t *ds_head;
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds->ds_dir->dd_phys->dd_head_dataset_obj, NULL,
|
|
DS_MODE_NONE, FTAG, &ds_head));
|
|
VERIFY(0 == dsl_dataset_get_snapname(ds));
|
|
#ifdef ZFS_DEBUG
|
|
{
|
|
uint64_t val;
|
|
err = zap_lookup(mos,
|
|
ds_head->ds_phys->ds_snapnames_zapobj,
|
|
ds->ds_snapname, 8, 1, &val);
|
|
ASSERT3U(err, ==, 0);
|
|
ASSERT3U(val, ==, obj);
|
|
}
|
|
#endif
|
|
err = zap_remove(mos, ds_head->ds_phys->ds_snapnames_zapobj,
|
|
ds->ds_snapname, tx);
|
|
ASSERT(err == 0);
|
|
dsl_dataset_close(ds_head, DS_MODE_NONE, FTAG);
|
|
}
|
|
|
|
if (ds_prev && ds->ds_prev != ds_prev)
|
|
dsl_dataset_close(ds_prev, DS_MODE_NONE, FTAG);
|
|
|
|
spa_clear_bootfs(dp->dp_spa, ds->ds_object, tx);
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, tag);
|
|
VERIFY(0 == dmu_object_free(mos, obj, tx));
|
|
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
objset_t *os = arg1;
|
|
dsl_dataset_t *ds = os->os->os_dsl_dataset;
|
|
const char *snapname = arg2;
|
|
objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
|
|
int err;
|
|
uint64_t value;
|
|
|
|
/*
|
|
* We don't allow multiple snapshots of the same txg. If there
|
|
* is already one, try again.
|
|
*/
|
|
if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg)
|
|
return (EAGAIN);
|
|
|
|
/*
|
|
* Check for conflicting name snapshot name.
|
|
*/
|
|
err = zap_lookup(mos, ds->ds_phys->ds_snapnames_zapobj,
|
|
snapname, 8, 1, &value);
|
|
if (err == 0)
|
|
return (EEXIST);
|
|
if (err != ENOENT)
|
|
return (err);
|
|
|
|
/*
|
|
* Check that the dataset's name is not too long. Name consists
|
|
* of the dataset's length + 1 for the @-sign + snapshot name's length
|
|
*/
|
|
if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN)
|
|
return (ENAMETOOLONG);
|
|
|
|
ds->ds_trysnap_txg = tx->tx_txg;
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
dsl_dataset_snapshot_sync(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
objset_t *os = arg1;
|
|
dsl_dataset_t *ds = os->os->os_dsl_dataset;
|
|
const char *snapname = arg2;
|
|
dsl_pool_t *dp = ds->ds_dir->dd_pool;
|
|
dmu_buf_t *dbuf;
|
|
dsl_dataset_phys_t *dsphys;
|
|
uint64_t dsobj;
|
|
objset_t *mos = dp->dp_meta_objset;
|
|
int err;
|
|
|
|
spa_scrub_restart(dp->dp_spa, tx->tx_txg);
|
|
ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock));
|
|
|
|
dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0,
|
|
DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx);
|
|
VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf));
|
|
dmu_buf_will_dirty(dbuf, tx);
|
|
dsphys = dbuf->db_data;
|
|
dsphys->ds_dir_obj = ds->ds_dir->dd_object;
|
|
dsphys->ds_fsid_guid = unique_create();
|
|
unique_remove(dsphys->ds_fsid_guid); /* it isn't open yet */
|
|
(void) random_get_pseudo_bytes((void*)&dsphys->ds_guid,
|
|
sizeof (dsphys->ds_guid));
|
|
dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj;
|
|
dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg;
|
|
dsphys->ds_next_snap_obj = ds->ds_object;
|
|
dsphys->ds_num_children = 1;
|
|
dsphys->ds_creation_time = gethrestime_sec();
|
|
dsphys->ds_creation_txg = tx->tx_txg;
|
|
dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj;
|
|
dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes;
|
|
dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes;
|
|
dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes;
|
|
dsphys->ds_flags = ds->ds_phys->ds_flags;
|
|
dsphys->ds_bp = ds->ds_phys->ds_bp;
|
|
dmu_buf_rele(dbuf, FTAG);
|
|
|
|
ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0);
|
|
if (ds->ds_prev) {
|
|
ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj ==
|
|
ds->ds_object ||
|
|
ds->ds_prev->ds_phys->ds_num_children > 1);
|
|
if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) {
|
|
dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
|
|
ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==,
|
|
ds->ds_prev->ds_phys->ds_creation_txg);
|
|
ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj;
|
|
}
|
|
}
|
|
|
|
bplist_close(&ds->ds_deadlist);
|
|
dmu_buf_will_dirty(ds->ds_dbuf, tx);
|
|
ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, dsphys->ds_creation_txg);
|
|
ds->ds_phys->ds_prev_snap_obj = dsobj;
|
|
ds->ds_phys->ds_prev_snap_txg = dsphys->ds_creation_txg;
|
|
ds->ds_phys->ds_unique_bytes = 0;
|
|
ds->ds_phys->ds_deadlist_obj =
|
|
bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx);
|
|
VERIFY(0 == bplist_open(&ds->ds_deadlist, mos,
|
|
ds->ds_phys->ds_deadlist_obj));
|
|
|
|
dprintf("snap '%s' -> obj %llu\n", snapname, dsobj);
|
|
err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj,
|
|
snapname, 8, 1, &dsobj, tx);
|
|
ASSERT(err == 0);
|
|
|
|
if (ds->ds_prev)
|
|
dsl_dataset_close(ds->ds_prev, DS_MODE_NONE, ds);
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds->ds_phys->ds_prev_snap_obj, snapname,
|
|
DS_MODE_NONE, ds, &ds->ds_prev));
|
|
}
|
|
|
|
void
|
|
dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx)
|
|
{
|
|
ASSERT(dmu_tx_is_syncing(tx));
|
|
ASSERT(ds->ds_user_ptr != NULL);
|
|
ASSERT(ds->ds_phys->ds_next_snap_obj == 0);
|
|
|
|
dsl_dir_dirty(ds->ds_dir, tx);
|
|
dmu_objset_sync(ds->ds_user_ptr, zio, tx);
|
|
/* Unneeded? bplist_close(&ds->ds_deadlist); */
|
|
}
|
|
|
|
void
|
|
dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv)
|
|
{
|
|
dsl_dir_stats(ds->ds_dir, nv);
|
|
|
|
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION,
|
|
ds->ds_phys->ds_creation_time);
|
|
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG,
|
|
ds->ds_phys->ds_creation_txg);
|
|
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED,
|
|
ds->ds_phys->ds_used_bytes);
|
|
|
|
if (ds->ds_phys->ds_next_snap_obj) {
|
|
/*
|
|
* This is a snapshot; override the dd's space used with
|
|
* our unique space and compression ratio.
|
|
*/
|
|
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED,
|
|
ds->ds_phys->ds_unique_bytes);
|
|
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO,
|
|
ds->ds_phys->ds_compressed_bytes == 0 ? 100 :
|
|
(ds->ds_phys->ds_uncompressed_bytes * 100 /
|
|
ds->ds_phys->ds_compressed_bytes));
|
|
}
|
|
}
|
|
|
|
void
|
|
dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat)
|
|
{
|
|
stat->dds_creation_txg = ds->ds_phys->ds_creation_txg;
|
|
stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT;
|
|
if (ds->ds_phys->ds_next_snap_obj) {
|
|
stat->dds_is_snapshot = B_TRUE;
|
|
stat->dds_num_clones = ds->ds_phys->ds_num_children - 1;
|
|
}
|
|
|
|
/* clone origin is really a dsl_dir thing... */
|
|
if (ds->ds_dir->dd_phys->dd_clone_parent_obj) {
|
|
dsl_dataset_t *ods;
|
|
|
|
rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER);
|
|
VERIFY(0 == dsl_dataset_open_obj(ds->ds_dir->dd_pool,
|
|
ds->ds_dir->dd_phys->dd_clone_parent_obj,
|
|
NULL, DS_MODE_NONE, FTAG, &ods));
|
|
dsl_dataset_name(ods, stat->dds_clone_of);
|
|
dsl_dataset_close(ods, DS_MODE_NONE, FTAG);
|
|
rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock);
|
|
}
|
|
}
|
|
|
|
uint64_t
|
|
dsl_dataset_fsid_guid(dsl_dataset_t *ds)
|
|
{
|
|
return (ds->ds_phys->ds_fsid_guid);
|
|
}
|
|
|
|
void
|
|
dsl_dataset_space(dsl_dataset_t *ds,
|
|
uint64_t *refdbytesp, uint64_t *availbytesp,
|
|
uint64_t *usedobjsp, uint64_t *availobjsp)
|
|
{
|
|
*refdbytesp = ds->ds_phys->ds_used_bytes;
|
|
*availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE);
|
|
*usedobjsp = ds->ds_phys->ds_bp.blk_fill;
|
|
*availobjsp = DN_MAX_OBJECT - *usedobjsp;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
char *newsnapname = arg2;
|
|
dsl_dir_t *dd = ds->ds_dir;
|
|
objset_t *mos = dd->dd_pool->dp_meta_objset;
|
|
dsl_dataset_t *hds;
|
|
uint64_t val;
|
|
int err;
|
|
|
|
err = dsl_dataset_open_obj(dd->dd_pool,
|
|
dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds);
|
|
if (err)
|
|
return (err);
|
|
|
|
/* new name better not be in use */
|
|
err = zap_lookup(mos, hds->ds_phys->ds_snapnames_zapobj,
|
|
newsnapname, 8, 1, &val);
|
|
dsl_dataset_close(hds, DS_MODE_NONE, FTAG);
|
|
|
|
if (err == 0)
|
|
err = EEXIST;
|
|
else if (err == ENOENT)
|
|
err = 0;
|
|
|
|
/* dataset name + 1 for the "@" + the new snapshot name must fit */
|
|
if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN)
|
|
err = ENAMETOOLONG;
|
|
|
|
return (err);
|
|
}
|
|
|
|
static void
|
|
dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *ds = arg1;
|
|
char *newsnapname = arg2;
|
|
dsl_dir_t *dd = ds->ds_dir;
|
|
objset_t *mos = dd->dd_pool->dp_meta_objset;
|
|
dsl_dataset_t *hds;
|
|
int err;
|
|
|
|
ASSERT(ds->ds_phys->ds_next_snap_obj != 0);
|
|
|
|
VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool,
|
|
dd->dd_phys->dd_head_dataset_obj, NULL, DS_MODE_NONE, FTAG, &hds));
|
|
|
|
VERIFY(0 == dsl_dataset_get_snapname(ds));
|
|
err = zap_remove(mos, hds->ds_phys->ds_snapnames_zapobj,
|
|
ds->ds_snapname, tx);
|
|
ASSERT3U(err, ==, 0);
|
|
mutex_enter(&ds->ds_lock);
|
|
(void) strcpy(ds->ds_snapname, newsnapname);
|
|
mutex_exit(&ds->ds_lock);
|
|
err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj,
|
|
ds->ds_snapname, 8, 1, &ds->ds_object, tx);
|
|
ASSERT3U(err, ==, 0);
|
|
|
|
dsl_dataset_close(hds, DS_MODE_NONE, FTAG);
|
|
}
|
|
|
|
struct renamearg {
|
|
dsl_sync_task_group_t *dstg;
|
|
char failed[MAXPATHLEN];
|
|
char *oldsnap;
|
|
char *newsnap;
|
|
};
|
|
|
|
static int
|
|
dsl_snapshot_rename_one(char *name, void *arg)
|
|
{
|
|
struct renamearg *ra = arg;
|
|
dsl_dataset_t *ds = NULL;
|
|
char *cp;
|
|
int err;
|
|
|
|
cp = name + strlen(name);
|
|
*cp = '@';
|
|
(void) strcpy(cp + 1, ra->oldsnap);
|
|
err = dsl_dataset_open(name, DS_MODE_READONLY | DS_MODE_STANDARD,
|
|
ra->dstg, &ds);
|
|
if (err == ENOENT) {
|
|
*cp = '\0';
|
|
return (0);
|
|
}
|
|
if (err) {
|
|
(void) strcpy(ra->failed, name);
|
|
*cp = '\0';
|
|
dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg);
|
|
return (err);
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
/* for all filesystems undergoing rename, we'll need to unmount it */
|
|
(void) zfs_unmount_snap(name, NULL);
|
|
#endif
|
|
|
|
*cp = '\0';
|
|
|
|
dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check,
|
|
dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
dsl_recursive_rename(char *oldname, const char *newname)
|
|
{
|
|
int err;
|
|
struct renamearg *ra;
|
|
dsl_sync_task_t *dst;
|
|
spa_t *spa;
|
|
char *cp, *fsname = spa_strdup(oldname);
|
|
int len = strlen(oldname);
|
|
|
|
/* truncate the snapshot name to get the fsname */
|
|
cp = strchr(fsname, '@');
|
|
*cp = '\0';
|
|
|
|
cp = strchr(fsname, '/');
|
|
if (cp) {
|
|
*cp = '\0';
|
|
err = spa_open(fsname, &spa, FTAG);
|
|
*cp = '/';
|
|
} else {
|
|
err = spa_open(fsname, &spa, FTAG);
|
|
}
|
|
if (err) {
|
|
kmem_free(fsname, len + 1);
|
|
return (err);
|
|
}
|
|
ra = kmem_alloc(sizeof (struct renamearg), KM_SLEEP);
|
|
ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa));
|
|
|
|
ra->oldsnap = strchr(oldname, '@') + 1;
|
|
ra->newsnap = strchr(newname, '@') + 1;
|
|
*ra->failed = '\0';
|
|
|
|
err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra,
|
|
DS_FIND_CHILDREN);
|
|
kmem_free(fsname, len + 1);
|
|
|
|
if (err == 0) {
|
|
err = dsl_sync_task_group_wait(ra->dstg);
|
|
}
|
|
|
|
for (dst = list_head(&ra->dstg->dstg_tasks); dst;
|
|
dst = list_next(&ra->dstg->dstg_tasks, dst)) {
|
|
dsl_dataset_t *ds = dst->dst_arg1;
|
|
if (dst->dst_err) {
|
|
dsl_dir_name(ds->ds_dir, ra->failed);
|
|
(void) strcat(ra->failed, "@");
|
|
(void) strcat(ra->failed, ra->newsnap);
|
|
}
|
|
dsl_dataset_close(ds, DS_MODE_STANDARD, ra->dstg);
|
|
}
|
|
|
|
(void) strcpy(oldname, ra->failed);
|
|
|
|
dsl_sync_task_group_destroy(ra->dstg);
|
|
kmem_free(ra, sizeof (struct renamearg));
|
|
spa_close(spa, FTAG);
|
|
return (err);
|
|
}
|
|
|
|
#pragma weak dmu_objset_rename = dsl_dataset_rename
|
|
int
|
|
dsl_dataset_rename(char *oldname, const char *newname,
|
|
boolean_t recursive)
|
|
{
|
|
dsl_dir_t *dd;
|
|
dsl_dataset_t *ds;
|
|
const char *tail;
|
|
int err;
|
|
|
|
err = dsl_dir_open(oldname, FTAG, &dd, &tail);
|
|
if (err)
|
|
return (err);
|
|
if (tail == NULL) {
|
|
err = dsl_dir_rename(dd, newname);
|
|
dsl_dir_close(dd, FTAG);
|
|
return (err);
|
|
}
|
|
if (tail[0] != '@') {
|
|
/* the name ended in a nonexistant component */
|
|
dsl_dir_close(dd, FTAG);
|
|
return (ENOENT);
|
|
}
|
|
|
|
dsl_dir_close(dd, FTAG);
|
|
|
|
/* new name must be snapshot in same filesystem */
|
|
tail = strchr(newname, '@');
|
|
if (tail == NULL)
|
|
return (EINVAL);
|
|
tail++;
|
|
if (strncmp(oldname, newname, tail - newname) != 0)
|
|
return (EXDEV);
|
|
|
|
if (recursive) {
|
|
err = dsl_recursive_rename(oldname, newname);
|
|
} else {
|
|
err = dsl_dataset_open(oldname,
|
|
DS_MODE_READONLY | DS_MODE_STANDARD, FTAG, &ds);
|
|
if (err)
|
|
return (err);
|
|
|
|
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
|
|
dsl_dataset_snapshot_rename_check,
|
|
dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1);
|
|
|
|
dsl_dataset_close(ds, DS_MODE_STANDARD, FTAG);
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
struct promotearg {
|
|
uint64_t used, comp, uncomp, unique;
|
|
uint64_t newnext_obj, snapnames_obj;
|
|
};
|
|
|
|
static int
|
|
dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *hds = arg1;
|
|
struct promotearg *pa = arg2;
|
|
dsl_dir_t *dd = hds->ds_dir;
|
|
dsl_pool_t *dp = hds->ds_dir->dd_pool;
|
|
dsl_dir_t *pdd = NULL;
|
|
dsl_dataset_t *ds = NULL;
|
|
dsl_dataset_t *pivot_ds = NULL;
|
|
dsl_dataset_t *newnext_ds = NULL;
|
|
int err;
|
|
char *name = NULL;
|
|
uint64_t itor = 0;
|
|
blkptr_t bp;
|
|
|
|
bzero(pa, sizeof (*pa));
|
|
|
|
/* Check that it is a clone */
|
|
if (dd->dd_phys->dd_clone_parent_obj == 0)
|
|
return (EINVAL);
|
|
|
|
/* Since this is so expensive, don't do the preliminary check */
|
|
if (!dmu_tx_is_syncing(tx))
|
|
return (0);
|
|
|
|
if (err = dsl_dataset_open_obj(dp,
|
|
dd->dd_phys->dd_clone_parent_obj,
|
|
NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds))
|
|
goto out;
|
|
pdd = pivot_ds->ds_dir;
|
|
|
|
{
|
|
dsl_dataset_t *phds;
|
|
if (err = dsl_dataset_open_obj(dd->dd_pool,
|
|
pdd->dd_phys->dd_head_dataset_obj,
|
|
NULL, DS_MODE_NONE, FTAG, &phds))
|
|
goto out;
|
|
pa->snapnames_obj = phds->ds_phys->ds_snapnames_zapobj;
|
|
dsl_dataset_close(phds, DS_MODE_NONE, FTAG);
|
|
}
|
|
|
|
if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) {
|
|
err = EXDEV;
|
|
goto out;
|
|
}
|
|
|
|
/* find pivot point's new next ds */
|
|
VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, hds->ds_object,
|
|
NULL, DS_MODE_NONE, FTAG, &newnext_ds));
|
|
while (newnext_ds->ds_phys->ds_prev_snap_obj != pivot_ds->ds_object) {
|
|
dsl_dataset_t *prev;
|
|
|
|
if (err = dsl_dataset_open_obj(dd->dd_pool,
|
|
newnext_ds->ds_phys->ds_prev_snap_obj,
|
|
NULL, DS_MODE_NONE, FTAG, &prev))
|
|
goto out;
|
|
dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG);
|
|
newnext_ds = prev;
|
|
}
|
|
pa->newnext_obj = newnext_ds->ds_object;
|
|
|
|
/* compute pivot point's new unique space */
|
|
while ((err = bplist_iterate(&newnext_ds->ds_deadlist,
|
|
&itor, &bp)) == 0) {
|
|
if (bp.blk_birth > pivot_ds->ds_phys->ds_prev_snap_txg)
|
|
pa->unique += bp_get_dasize(dd->dd_pool->dp_spa, &bp);
|
|
}
|
|
if (err != ENOENT)
|
|
goto out;
|
|
|
|
/* Walk the snapshots that we are moving */
|
|
name = kmem_alloc(MAXPATHLEN, KM_SLEEP);
|
|
ds = pivot_ds;
|
|
/* CONSTCOND */
|
|
while (TRUE) {
|
|
uint64_t val, dlused, dlcomp, dluncomp;
|
|
dsl_dataset_t *prev;
|
|
|
|
/* Check that the snapshot name does not conflict */
|
|
dsl_dataset_name(ds, name);
|
|
err = zap_lookup(dd->dd_pool->dp_meta_objset,
|
|
hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname,
|
|
8, 1, &val);
|
|
if (err != ENOENT) {
|
|
if (err == 0)
|
|
err = EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* compute space to transfer. Each snapshot gave birth to:
|
|
* (my used) - (prev's used) + (deadlist's used)
|
|
*/
|
|
pa->used += ds->ds_phys->ds_used_bytes;
|
|
pa->comp += ds->ds_phys->ds_compressed_bytes;
|
|
pa->uncomp += ds->ds_phys->ds_uncompressed_bytes;
|
|
|
|
/* If we reach the first snapshot, we're done. */
|
|
if (ds->ds_phys->ds_prev_snap_obj == 0)
|
|
break;
|
|
|
|
if (err = bplist_space(&ds->ds_deadlist,
|
|
&dlused, &dlcomp, &dluncomp))
|
|
goto out;
|
|
if (err = dsl_dataset_open_obj(dd->dd_pool,
|
|
ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE,
|
|
FTAG, &prev))
|
|
goto out;
|
|
pa->used += dlused - prev->ds_phys->ds_used_bytes;
|
|
pa->comp += dlcomp - prev->ds_phys->ds_compressed_bytes;
|
|
pa->uncomp += dluncomp - prev->ds_phys->ds_uncompressed_bytes;
|
|
|
|
/*
|
|
* We could be a clone of a clone. If we reach our
|
|
* parent's branch point, we're done.
|
|
*/
|
|
if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) {
|
|
dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG);
|
|
break;
|
|
}
|
|
if (ds != pivot_ds)
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
ds = prev;
|
|
}
|
|
|
|
/* Check that there is enough space here */
|
|
err = dsl_dir_transfer_possible(pdd, dd, pa->used);
|
|
|
|
out:
|
|
if (ds && ds != pivot_ds)
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
if (pivot_ds)
|
|
dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
if (newnext_ds)
|
|
dsl_dataset_close(newnext_ds, DS_MODE_NONE, FTAG);
|
|
if (name)
|
|
kmem_free(name, MAXPATHLEN);
|
|
return (err);
|
|
}
|
|
|
|
static void
|
|
dsl_dataset_promote_sync(void *arg1, void *arg2, dmu_tx_t *tx)
|
|
{
|
|
dsl_dataset_t *hds = arg1;
|
|
struct promotearg *pa = arg2;
|
|
dsl_dir_t *dd = hds->ds_dir;
|
|
dsl_pool_t *dp = hds->ds_dir->dd_pool;
|
|
dsl_dir_t *pdd = NULL;
|
|
dsl_dataset_t *ds, *pivot_ds;
|
|
char *name;
|
|
|
|
ASSERT(dd->dd_phys->dd_clone_parent_obj != 0);
|
|
ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE));
|
|
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
dd->dd_phys->dd_clone_parent_obj,
|
|
NULL, DS_MODE_EXCLUSIVE, FTAG, &pivot_ds));
|
|
/*
|
|
* We need to explicitly open pdd, since pivot_ds's pdd will be
|
|
* changing.
|
|
*/
|
|
VERIFY(0 == dsl_dir_open_obj(dp, pivot_ds->ds_dir->dd_object,
|
|
NULL, FTAG, &pdd));
|
|
|
|
/* move snapshots to this dir */
|
|
name = kmem_alloc(MAXPATHLEN, KM_SLEEP);
|
|
ds = pivot_ds;
|
|
/* CONSTCOND */
|
|
while (TRUE) {
|
|
dsl_dataset_t *prev;
|
|
|
|
/* move snap name entry */
|
|
dsl_dataset_name(ds, name);
|
|
VERIFY(0 == zap_remove(dp->dp_meta_objset,
|
|
pa->snapnames_obj, ds->ds_snapname, tx));
|
|
VERIFY(0 == zap_add(dp->dp_meta_objset,
|
|
hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname,
|
|
8, 1, &ds->ds_object, tx));
|
|
|
|
/* change containing dsl_dir */
|
|
dmu_buf_will_dirty(ds->ds_dbuf, tx);
|
|
ASSERT3U(ds->ds_phys->ds_dir_obj, ==, pdd->dd_object);
|
|
ds->ds_phys->ds_dir_obj = dd->dd_object;
|
|
ASSERT3P(ds->ds_dir, ==, pdd);
|
|
dsl_dir_close(ds->ds_dir, ds);
|
|
VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object,
|
|
NULL, ds, &ds->ds_dir));
|
|
|
|
ASSERT3U(dsl_prop_numcb(ds), ==, 0);
|
|
|
|
if (ds->ds_phys->ds_prev_snap_obj == 0)
|
|
break;
|
|
|
|
VERIFY(0 == dsl_dataset_open_obj(dp,
|
|
ds->ds_phys->ds_prev_snap_obj, NULL, DS_MODE_EXCLUSIVE,
|
|
FTAG, &prev));
|
|
|
|
if (prev->ds_phys->ds_next_snap_obj != ds->ds_object) {
|
|
dsl_dataset_close(prev, DS_MODE_EXCLUSIVE, FTAG);
|
|
break;
|
|
}
|
|
if (ds != pivot_ds)
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
ds = prev;
|
|
}
|
|
if (ds != pivot_ds)
|
|
dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
|
|
/* change pivot point's next snap */
|
|
dmu_buf_will_dirty(pivot_ds->ds_dbuf, tx);
|
|
pivot_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj;
|
|
|
|
/* change clone_parent-age */
|
|
dmu_buf_will_dirty(dd->dd_dbuf, tx);
|
|
ASSERT3U(dd->dd_phys->dd_clone_parent_obj, ==, pivot_ds->ds_object);
|
|
dd->dd_phys->dd_clone_parent_obj = pdd->dd_phys->dd_clone_parent_obj;
|
|
dmu_buf_will_dirty(pdd->dd_dbuf, tx);
|
|
pdd->dd_phys->dd_clone_parent_obj = pivot_ds->ds_object;
|
|
|
|
/* change space accounting */
|
|
dsl_dir_diduse_space(pdd, -pa->used, -pa->comp, -pa->uncomp, tx);
|
|
dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx);
|
|
pivot_ds->ds_phys->ds_unique_bytes = pa->unique;
|
|
|
|
dsl_dir_close(pdd, FTAG);
|
|
dsl_dataset_close(pivot_ds, DS_MODE_EXCLUSIVE, FTAG);
|
|
kmem_free(name, MAXPATHLEN);
|
|
}
|
|
|
|
int
|
|
dsl_dataset_promote(const char *name)
|
|
{
|
|
dsl_dataset_t *ds;
|
|
int err;
|
|
dmu_object_info_t doi;
|
|
struct promotearg pa;
|
|
|
|
err = dsl_dataset_open(name, DS_MODE_NONE, FTAG, &ds);
|
|
if (err)
|
|
return (err);
|
|
|
|
err = dmu_object_info(ds->ds_dir->dd_pool->dp_meta_objset,
|
|
ds->ds_phys->ds_snapnames_zapobj, &doi);
|
|
if (err) {
|
|
dsl_dataset_close(ds, DS_MODE_NONE, FTAG);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Add in 128x the snapnames zapobj size, since we will be moving
|
|
* a bunch of snapnames to the promoted ds, and dirtying their
|
|
* bonus buffers.
|
|
*/
|
|
err = dsl_sync_task_do(ds->ds_dir->dd_pool,
|
|
dsl_dataset_promote_check,
|
|
dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks);
|
|
dsl_dataset_close(ds, DS_MODE_NONE, FTAG);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Given a pool name and a dataset object number in that pool,
|
|
* return the name of that dataset.
|
|
*/
|
|
int
|
|
dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf)
|
|
{
|
|
spa_t *spa;
|
|
dsl_pool_t *dp;
|
|
dsl_dataset_t *ds = NULL;
|
|
int error;
|
|
|
|
if ((error = spa_open(pname, &spa, FTAG)) != 0)
|
|
return (error);
|
|
dp = spa_get_dsl(spa);
|
|
rw_enter(&dp->dp_config_rwlock, RW_READER);
|
|
if ((error = dsl_dataset_open_obj(dp, obj,
|
|
NULL, DS_MODE_NONE, FTAG, &ds)) != 0) {
|
|
rw_exit(&dp->dp_config_rwlock);
|
|
spa_close(spa, FTAG);
|
|
return (error);
|
|
}
|
|
dsl_dataset_name(ds, buf);
|
|
dsl_dataset_close(ds, DS_MODE_NONE, FTAG);
|
|
rw_exit(&dp->dp_config_rwlock);
|
|
spa_close(spa, FTAG);
|
|
|
|
return (0);
|
|
}
|