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e625030c11
Problem Statement ================= ZFS Channel program scripts currently require a timeout, so that hung or long-running scripts return a timeout error instead of causing ZFS to get wedged. This limit can currently be set up to 100 million Lua instructions. Even with a limit in place, it would be desirable to have a sys admin (support engineer) be able to cancel a script that is taking a long time. Proposed Solution ================= Make it possible to abort a channel program by sending an interrupt signal.In the underlying txg_wait_sync function, switch the cv_wait to a cv_wait_sig to catch the signal. Once a signal is encountered, the dsl_sync_task function can install a Lua hook that will get called before the Lua interpreter executes a new line of code. The dsl_sync_task can resume with a standard txg_wait_sync call and wait for the txg to complete. Meanwhile, the hook will abort the script and indicate that the channel program was canceled. The kernel returns a EINTR to indicate that the channel program run was canceled. Porting notes: Added missing return value from cv_wait_sig() Authored by: Don Brady <don.brady@delphix.com> Reviewed by: Sebastien Roy <sebastien.roy@delphix.com> Reviewed by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com> Reviewed by: Matt Ahrens <matt@delphix.com> Reviewed by: Sara Hartse <sara.hartse@delphix.com> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Approved by: Robert Mustacchi <rm@joyent.com> Ported-by: Don Brady <don.brady@delphix.com> Signed-off-by: Don Brady <don.brady@delphix.com> OpenZFS-issue: https://www.illumos.org/issues/9425 OpenZFS-commit: https://github.com/illumos/illumos-gate/commit/d0cb1fb926 Closes #8904
154 lines
4.6 KiB
C
154 lines
4.6 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 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_TXG_H
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#define _SYS_TXG_H
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#include <sys/spa.h>
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */
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#define TXG_SIZE 4 /* next power of 2 */
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#define TXG_MASK (TXG_SIZE - 1) /* mask for size */
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#define TXG_INITIAL TXG_SIZE /* initial txg */
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#define TXG_IDX (txg & TXG_MASK)
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/* Number of txgs worth of frees we defer adding to in-core spacemaps */
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#define TXG_DEFER_SIZE 2
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typedef struct tx_cpu tx_cpu_t;
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typedef struct txg_handle {
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tx_cpu_t *th_cpu;
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uint64_t th_txg;
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} txg_handle_t;
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typedef struct txg_node {
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struct txg_node *tn_next[TXG_SIZE];
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uint8_t tn_member[TXG_SIZE];
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} txg_node_t;
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typedef struct txg_list {
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kmutex_t tl_lock;
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size_t tl_offset;
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spa_t *tl_spa;
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txg_node_t *tl_head[TXG_SIZE];
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} txg_list_t;
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struct dsl_pool;
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extern void txg_init(struct dsl_pool *dp, uint64_t txg);
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extern void txg_fini(struct dsl_pool *dp);
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extern void txg_sync_start(struct dsl_pool *dp);
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extern void txg_sync_stop(struct dsl_pool *dp);
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extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp);
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extern void txg_rele_to_quiesce(txg_handle_t *txghp);
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extern void txg_rele_to_sync(txg_handle_t *txghp);
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extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks);
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extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta,
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hrtime_t resolution);
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extern void txg_kick(struct dsl_pool *dp);
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/*
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* Wait until the given transaction group has finished syncing.
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* Try to make this happen as soon as possible (eg. kick off any
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* necessary syncs immediately). If txg==0, wait for the currently open
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* txg to finish syncing.
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*/
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extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
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/*
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* Wait as above. Returns true if the thread was signaled while waiting.
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*/
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extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg);
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/*
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* Wait until the given transaction group, or one after it, is
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* the open transaction group. Try to make this happen as soon
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* as possible (eg. kick off any necessary syncs immediately) when
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* should_quiesce is set. If txg == 0, wait for the next open txg.
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*/
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extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg,
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boolean_t should_quiesce);
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/*
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* Returns TRUE if we are "backed up" waiting for the syncing
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* transaction to complete; otherwise returns FALSE.
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*/
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extern boolean_t txg_stalled(struct dsl_pool *dp);
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/* returns TRUE if someone is waiting for the next txg to sync */
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extern boolean_t txg_sync_waiting(struct dsl_pool *dp);
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extern void txg_verify(spa_t *spa, uint64_t txg);
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/*
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* Wait for pending commit callbacks of already-synced transactions to finish
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* processing.
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*/
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extern void txg_wait_callbacks(struct dsl_pool *dp);
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/*
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* Per-txg object lists.
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*/
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#define TXG_CLEAN(txg) ((txg) - 1)
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extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset);
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extern void txg_list_destroy(txg_list_t *tl);
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extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg);
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extern boolean_t txg_all_lists_empty(txg_list_t *tl);
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extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg);
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extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg);
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extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
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extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
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extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
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extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
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extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
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/* Global tuning */
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extern int zfs_txg_timeout;
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#ifdef ZFS_DEBUG
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#define TXG_VERIFY(spa, txg) txg_verify(spa, txg)
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#else
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#define TXG_VERIFY(spa, txg)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_TXG_H */
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