244 lines
7.5 KiB
C
244 lines
7.5 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
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*/
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#include <sys/dmu.h>
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#include <sys/dmu_tx.h>
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#include <sys/dsl_pool.h>
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#include <sys/dsl_dir.h>
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#include <sys/dsl_synctask.h>
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#include <sys/metaslab.h>
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#define DST_AVG_BLKSHIFT 14
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/* ARGSUSED */
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static int
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dsl_null_checkfunc(void *arg, dmu_tx_t *tx)
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{
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return (0);
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}
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static int
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dsl_sync_task_common(const char *pool, dsl_checkfunc_t *checkfunc,
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dsl_syncfunc_t *syncfunc, void *arg,
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int blocks_modified, zfs_space_check_t space_check, boolean_t early)
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{
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spa_t *spa;
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dmu_tx_t *tx;
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int err;
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dsl_sync_task_t dst = { { { NULL } } };
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dsl_pool_t *dp;
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err = spa_open(pool, &spa, FTAG);
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if (err != 0)
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return (err);
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dp = spa_get_dsl(spa);
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top:
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tx = dmu_tx_create_dd(dp->dp_mos_dir);
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VERIFY0(dmu_tx_assign(tx, TXG_WAIT));
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dst.dst_pool = dp;
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dst.dst_txg = dmu_tx_get_txg(tx);
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dst.dst_space = blocks_modified << DST_AVG_BLKSHIFT;
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dst.dst_space_check = space_check;
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dst.dst_checkfunc = checkfunc != NULL ? checkfunc : dsl_null_checkfunc;
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dst.dst_syncfunc = syncfunc;
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dst.dst_arg = arg;
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dst.dst_error = 0;
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dst.dst_nowaiter = B_FALSE;
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dsl_pool_config_enter(dp, FTAG);
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err = dst.dst_checkfunc(arg, tx);
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dsl_pool_config_exit(dp, FTAG);
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if (err != 0) {
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dmu_tx_commit(tx);
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spa_close(spa, FTAG);
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return (err);
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}
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txg_list_t *task_list = (early) ?
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&dp->dp_early_sync_tasks : &dp->dp_sync_tasks;
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VERIFY(txg_list_add_tail(task_list, &dst, dst.dst_txg));
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dmu_tx_commit(tx);
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txg_wait_synced(dp, dst.dst_txg);
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if (dst.dst_error == EAGAIN) {
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txg_wait_synced(dp, dst.dst_txg + TXG_DEFER_SIZE);
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goto top;
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}
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spa_close(spa, FTAG);
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return (dst.dst_error);
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}
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/*
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* Called from open context to perform a callback in syncing context. Waits
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* for the operation to complete.
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*
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* The checkfunc will be called from open context as a preliminary check
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* which can quickly fail. If it succeeds, it will be called again from
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* syncing context. The checkfunc should generally be designed to work
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* properly in either context, but if necessary it can check
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* dmu_tx_is_syncing(tx).
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*
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* The synctask infrastructure enforces proper locking strategy with respect
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* to the dp_config_rwlock -- the lock will always be held when the callbacks
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* are called. It will be held for read during the open-context (preliminary)
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* call to the checkfunc, and then held for write from syncing context during
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* the calls to the check and sync funcs.
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*
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* A dataset or pool name can be passed as the first argument. Typically,
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* the check func will hold, check the return value of the hold, and then
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* release the dataset. The sync func will VERIFYO(hold()) the dataset.
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* This is safe because no changes can be made between the check and sync funcs,
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* and the sync func will only be called if the check func successfully opened
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* the dataset.
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*/
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int
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dsl_sync_task(const char *pool, dsl_checkfunc_t *checkfunc,
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dsl_syncfunc_t *syncfunc, void *arg,
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int blocks_modified, zfs_space_check_t space_check)
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{
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return (dsl_sync_task_common(pool, checkfunc, syncfunc, arg,
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blocks_modified, space_check, B_FALSE));
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}
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/*
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* An early synctask works exactly as a standard synctask with one important
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* difference on the way it is handled during syncing context. Standard
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* synctasks run after we've written out all the dirty blocks of dirty
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* datasets. Early synctasks are executed before writing out any dirty data,
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* and thus before standard synctasks.
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*
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* For that reason, early synctasks can affect the process of writing dirty
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* changes to disk for the txg that they run and should be used with caution.
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* In addition, early synctasks should not dirty any metaslabs as this would
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* invalidate the precodition/invariant for subsequent early synctasks.
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* [see dsl_pool_sync() and dsl_early_sync_task_verify()]
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*/
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int
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dsl_early_sync_task(const char *pool, dsl_checkfunc_t *checkfunc,
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dsl_syncfunc_t *syncfunc, void *arg,
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int blocks_modified, zfs_space_check_t space_check)
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{
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return (dsl_sync_task_common(pool, checkfunc, syncfunc, arg,
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blocks_modified, space_check, B_TRUE));
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}
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static void
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dsl_sync_task_nowait_common(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
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int blocks_modified, zfs_space_check_t space_check, dmu_tx_t *tx,
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boolean_t early)
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{
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dsl_sync_task_t *dst = kmem_zalloc(sizeof (*dst), KM_SLEEP);
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dst->dst_pool = dp;
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dst->dst_txg = dmu_tx_get_txg(tx);
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dst->dst_space = blocks_modified << DST_AVG_BLKSHIFT;
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dst->dst_space_check = space_check;
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dst->dst_checkfunc = dsl_null_checkfunc;
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dst->dst_syncfunc = syncfunc;
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dst->dst_arg = arg;
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dst->dst_error = 0;
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dst->dst_nowaiter = B_TRUE;
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txg_list_t *task_list = (early) ?
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&dp->dp_early_sync_tasks : &dp->dp_sync_tasks;
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VERIFY(txg_list_add_tail(task_list, dst, dst->dst_txg));
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}
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void
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dsl_sync_task_nowait(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
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int blocks_modified, zfs_space_check_t space_check, dmu_tx_t *tx)
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{
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dsl_sync_task_nowait_common(dp, syncfunc, arg,
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blocks_modified, space_check, tx, B_FALSE);
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}
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void
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dsl_early_sync_task_nowait(dsl_pool_t *dp, dsl_syncfunc_t *syncfunc, void *arg,
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int blocks_modified, zfs_space_check_t space_check, dmu_tx_t *tx)
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{
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dsl_sync_task_nowait_common(dp, syncfunc, arg,
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blocks_modified, space_check, tx, B_TRUE);
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}
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/*
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* Called in syncing context to execute the synctask.
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*/
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void
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dsl_sync_task_sync(dsl_sync_task_t *dst, dmu_tx_t *tx)
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{
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dsl_pool_t *dp = dst->dst_pool;
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ASSERT0(dst->dst_error);
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/*
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* Check for sufficient space.
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*
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* When the sync task was created, the caller specified the
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* type of space checking required. See the comment in
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* zfs_space_check_t for details on the semantics of each
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* type of space checking.
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*
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* We just check against what's on-disk; we don't want any
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* in-flight accounting to get in our way, because open context
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* may have already used up various in-core limits
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* (arc_tempreserve, dsl_pool_tempreserve).
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*/
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if (dst->dst_space_check != ZFS_SPACE_CHECK_NONE) {
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uint64_t quota = dsl_pool_unreserved_space(dp,
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dst->dst_space_check);
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uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes;
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/* MOS space is triple-dittoed, so we multiply by 3. */
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if (used + dst->dst_space * 3 > quota) {
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dst->dst_error = SET_ERROR(ENOSPC);
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if (dst->dst_nowaiter)
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kmem_free(dst, sizeof (*dst));
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return;
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}
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}
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/*
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* Check for errors by calling checkfunc.
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*/
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rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG);
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dst->dst_error = dst->dst_checkfunc(dst->dst_arg, tx);
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if (dst->dst_error == 0)
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dst->dst_syncfunc(dst->dst_arg, tx);
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rrw_exit(&dp->dp_config_rwlock, FTAG);
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if (dst->dst_nowaiter)
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kmem_free(dst, sizeof (*dst));
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}
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#if defined(_KERNEL)
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EXPORT_SYMBOL(dsl_sync_task);
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EXPORT_SYMBOL(dsl_sync_task_nowait);
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#endif
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