186898bbb5
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
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License (the "License").
|
|
* You may not use this file except in compliance with the License.
|
|
*
|
|
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
|
|
* or http://www.opensolaris.org/os/licensing.
|
|
* See the License for the specific language governing permissions
|
|
* and limitations under the License.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
|
|
* If applicable, add the following below this CDDL HEADER, with the
|
|
* fields enclosed by brackets "[]" replaced with your own identifying
|
|
* information: Portions Copyright [yyyy] [name of copyright owner]
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
/*
|
|
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
|
|
* Use is subject to license terms.
|
|
*/
|
|
/*
|
|
* Copyright (c) 2012, 2017 by Delphix. All rights reserved.
|
|
*/
|
|
|
|
#ifndef _SYS_TXG_H
|
|
#define _SYS_TXG_H
|
|
|
|
#include <sys/spa.h>
|
|
#include <sys/zfs_context.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#define TXG_CONCURRENT_STATES 3 /* open, quiescing, syncing */
|
|
#define TXG_SIZE 4 /* next power of 2 */
|
|
#define TXG_MASK (TXG_SIZE - 1) /* mask for size */
|
|
#define TXG_INITIAL TXG_SIZE /* initial txg */
|
|
#define TXG_IDX (txg & TXG_MASK)
|
|
|
|
/* Number of txgs worth of frees we defer adding to in-core spacemaps */
|
|
#define TXG_DEFER_SIZE 2
|
|
|
|
typedef struct tx_cpu tx_cpu_t;
|
|
|
|
typedef struct txg_handle {
|
|
tx_cpu_t *th_cpu;
|
|
uint64_t th_txg;
|
|
} txg_handle_t;
|
|
|
|
typedef struct txg_node {
|
|
struct txg_node *tn_next[TXG_SIZE];
|
|
uint8_t tn_member[TXG_SIZE];
|
|
} txg_node_t;
|
|
|
|
typedef struct txg_list {
|
|
kmutex_t tl_lock;
|
|
size_t tl_offset;
|
|
spa_t *tl_spa;
|
|
txg_node_t *tl_head[TXG_SIZE];
|
|
} txg_list_t;
|
|
|
|
struct dsl_pool;
|
|
|
|
extern void txg_init(struct dsl_pool *dp, uint64_t txg);
|
|
extern void txg_fini(struct dsl_pool *dp);
|
|
extern void txg_sync_start(struct dsl_pool *dp);
|
|
extern void txg_sync_stop(struct dsl_pool *dp);
|
|
extern uint64_t txg_hold_open(struct dsl_pool *dp, txg_handle_t *txghp);
|
|
extern void txg_rele_to_quiesce(txg_handle_t *txghp);
|
|
extern void txg_rele_to_sync(txg_handle_t *txghp);
|
|
extern void txg_register_callbacks(txg_handle_t *txghp, list_t *tx_callbacks);
|
|
|
|
extern void txg_delay(struct dsl_pool *dp, uint64_t txg, hrtime_t delta,
|
|
hrtime_t resolution);
|
|
extern void txg_kick(struct dsl_pool *dp);
|
|
|
|
/*
|
|
* Wait until the given transaction group has finished syncing.
|
|
* Try to make this happen as soon as possible (eg. kick off any
|
|
* necessary syncs immediately). If txg==0, wait for the currently open
|
|
* txg to finish syncing.
|
|
*/
|
|
extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg);
|
|
|
|
/*
|
|
* Wait as above. Returns true if the thread was signaled while waiting.
|
|
*/
|
|
extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg);
|
|
|
|
/*
|
|
* Wait until the given transaction group, or one after it, is
|
|
* the open transaction group. Try to make this happen as soon
|
|
* as possible (eg. kick off any necessary syncs immediately) when
|
|
* should_quiesce is set. If txg == 0, wait for the next open txg.
|
|
*/
|
|
extern void txg_wait_open(struct dsl_pool *dp, uint64_t txg,
|
|
boolean_t should_quiesce);
|
|
|
|
/*
|
|
* Returns TRUE if we are "backed up" waiting for the syncing
|
|
* transaction to complete; otherwise returns FALSE.
|
|
*/
|
|
extern boolean_t txg_stalled(struct dsl_pool *dp);
|
|
|
|
/* returns TRUE if someone is waiting for the next txg to sync */
|
|
extern boolean_t txg_sync_waiting(struct dsl_pool *dp);
|
|
|
|
extern void txg_verify(spa_t *spa, uint64_t txg);
|
|
|
|
/*
|
|
* Wait for pending commit callbacks of already-synced transactions to finish
|
|
* processing.
|
|
*/
|
|
extern void txg_wait_callbacks(struct dsl_pool *dp);
|
|
|
|
/*
|
|
* Per-txg object lists.
|
|
*/
|
|
|
|
#define TXG_CLEAN(txg) ((txg) - 1)
|
|
|
|
extern void txg_list_create(txg_list_t *tl, spa_t *spa, size_t offset);
|
|
extern void txg_list_destroy(txg_list_t *tl);
|
|
extern boolean_t txg_list_empty(txg_list_t *tl, uint64_t txg);
|
|
extern boolean_t txg_all_lists_empty(txg_list_t *tl);
|
|
extern boolean_t txg_list_add(txg_list_t *tl, void *p, uint64_t txg);
|
|
extern boolean_t txg_list_add_tail(txg_list_t *tl, void *p, uint64_t txg);
|
|
extern void *txg_list_remove(txg_list_t *tl, uint64_t txg);
|
|
extern void *txg_list_remove_this(txg_list_t *tl, void *p, uint64_t txg);
|
|
extern boolean_t txg_list_member(txg_list_t *tl, void *p, uint64_t txg);
|
|
extern void *txg_list_head(txg_list_t *tl, uint64_t txg);
|
|
extern void *txg_list_next(txg_list_t *tl, void *p, uint64_t txg);
|
|
|
|
/* Global tuning */
|
|
extern int zfs_txg_timeout;
|
|
|
|
|
|
#ifdef ZFS_DEBUG
|
|
#define TXG_VERIFY(spa, txg) txg_verify(spa, txg)
|
|
#else
|
|
#define TXG_VERIFY(spa, txg)
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _SYS_TXG_H */
|