projects / mirror_zfs.git / blame
| Commit | Line | Data |
|---|---|---|
| 379ca9cf OF |
1 | /* |
| 2 | * CDDL HEADER START | |
| 3 | * | |
| 4 | * This file and its contents are supplied under the terms of the | |
| 5 | * Common Development and Distribution License ("CDDL"), version 1.0. | |
| 6 | * You may only use this file in accordance with the terms of version | |
| 7 | * 1.0 of the CDDL. | |
| 8 | * | |
| 9 | * A full copy of the text of the CDDL should have accompanied this | |
| 10 | * source. A copy of the CDDL is also available via the Internet at | |
| 11 | * http://www.illumos.org/license/CDDL. | |
| 12 | * | |
| 13 | * CDDL HEADER END | |
| 14 | */ | |
| 15 | /* | |
| 16 | * Copyright (C) 2017 by Lawrence Livermore National Security, LLC. | |
| 17 | */ | |
| 18 | ||
| 19 | #ifndef _SYS_MMP_H | |
| 20 | #define _SYS_MMP_H | |
| 21 | ||
| 22 | #include <sys/spa.h> | |
| 23 | #include <sys/zfs_context.h> | |
| 24 | #include <sys/uberblock_impl.h> | |
| 25 | ||
| 26 | #ifdef __cplusplus | |
| 27 | extern "C" { | |
| 28 | #endif | |
| 29 | ||
| 30 | #define MMP_MIN_INTERVAL 100 /* ms */ | |
| 31 | #define MMP_DEFAULT_INTERVAL 1000 /* ms */ | |
| db2af93d OF |
32 | #define MMP_DEFAULT_IMPORT_INTERVALS 20 |
| 33 | #define MMP_DEFAULT_FAIL_INTERVALS 10 | |
| 060f0226 OF |
34 | #define MMP_MIN_FAIL_INTERVALS 2 /* min if != 0 */ |
| 35 | #define MMP_IMPORT_SAFETY_FACTOR 200 /* pct */ | |
| 36 | #define MMP_INTERVAL_OK(interval) MAX(interval, MMP_MIN_INTERVAL) | |
| 37 | #define MMP_FAIL_INTVS_OK(fails) (fails == 0 ? 0 : MAX(fails, \ | |
| 38 | MMP_MIN_FAIL_INTERVALS)) | |
| 379ca9cf OF |
39 | |
| 40 | typedef struct mmp_thread { | |
| 41 | kmutex_t mmp_thread_lock; /* protect thread mgmt fields */ | |
| 42 | kcondvar_t mmp_thread_cv; | |
| 43 | kthread_t *mmp_thread; | |
| 44 | uint8_t mmp_thread_exiting; | |
| 45 | kmutex_t mmp_io_lock; /* protect below */ | |
| 46 | hrtime_t mmp_last_write; /* last successful MMP write */ | |
| 47 | uint64_t mmp_delay; /* decaying avg ns between MMP writes */ | |
| 48 | uberblock_t mmp_ub; /* last ub written by sync */ | |
| 49 | zio_t *mmp_zio_root; /* root of mmp write zios */ | |
| 7088545d | 50 | uint64_t mmp_kstat_id; /* unique id for next MMP write kstat */ |
| d2160d05 | 51 | int mmp_skip_error; /* reason for last skipped write */ |
| 3d31aad8 OF |
52 | vdev_t *mmp_last_leaf; /* last mmp write sent here */ |
| 53 | uint64_t mmp_leaf_last_gen; /* last mmp write sent here */ | |
| 060f0226 | 54 | uint32_t mmp_seq; /* intra-second update counter */ |
| 379ca9cf OF |
55 | } mmp_thread_t; |
| 56 | ||
| 57 | ||
| 58 | extern void mmp_init(struct spa *spa); | |
| 59 | extern void mmp_fini(struct spa *spa); | |
| 60 | extern void mmp_thread_start(struct spa *spa); | |
| 61 | extern void mmp_thread_stop(struct spa *spa); | |
| 62 | extern void mmp_update_uberblock(struct spa *spa, struct uberblock *ub); | |
| 0582e403 | 63 | extern void mmp_signal_all_threads(void); |
| 379ca9cf OF |
64 | |
| 65 | /* Global tuning */ | |
| 66 | extern ulong_t zfs_multihost_interval; | |
| 67 | extern uint_t zfs_multihost_fail_intervals; | |
| 68 | extern uint_t zfs_multihost_import_intervals; | |
| 69 | ||
| 70 | #ifdef __cplusplus | |
| 71 | } | |
| 72 | #endif | |
| 73 | ||
| 74 | #endif /* _SYS_MMP_H */ |