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1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. | |
23 | * Copyright (c) 2012, 2014 by Delphix. All rights reserved. | |
24 | */ | |
25 | ||
26 | #ifndef _SYS_DSL_SCAN_H | |
27 | #define _SYS_DSL_SCAN_H | |
28 | ||
29 | #include <sys/zfs_context.h> | |
30 | #include <sys/zio.h> | |
31 | #include <sys/ddt.h> | |
32 | #include <sys/bplist.h> | |
33 | ||
34 | #ifdef __cplusplus | |
35 | extern "C" { | |
36 | #endif | |
37 | ||
38 | struct objset; | |
39 | struct dsl_dir; | |
40 | struct dsl_dataset; | |
41 | struct dsl_pool; | |
42 | struct dmu_tx; | |
43 | ||
44 | /* | |
45 | * All members of this structure must be uint64_t, for byteswap | |
46 | * purposes. | |
47 | */ | |
48 | typedef struct dsl_scan_phys { | |
49 | uint64_t scn_func; /* pool_scan_func_t */ | |
50 | uint64_t scn_state; /* dsl_scan_state_t */ | |
51 | uint64_t scn_queue_obj; | |
52 | uint64_t scn_min_txg; | |
53 | uint64_t scn_max_txg; | |
54 | uint64_t scn_cur_min_txg; | |
55 | uint64_t scn_cur_max_txg; | |
56 | uint64_t scn_start_time; | |
57 | uint64_t scn_end_time; | |
58 | uint64_t scn_to_examine; /* total bytes to be scanned */ | |
59 | uint64_t scn_examined; /* bytes scanned so far */ | |
60 | uint64_t scn_to_process; | |
61 | uint64_t scn_processed; | |
62 | uint64_t scn_errors; /* scan I/O error count */ | |
63 | uint64_t scn_ddt_class_max; | |
64 | ddt_bookmark_t scn_ddt_bookmark; | |
65 | zbookmark_phys_t scn_bookmark; | |
66 | uint64_t scn_flags; /* dsl_scan_flags_t */ | |
67 | } dsl_scan_phys_t; | |
68 | ||
69 | #define SCAN_PHYS_NUMINTS (sizeof (dsl_scan_phys_t) / sizeof (uint64_t)) | |
70 | ||
71 | typedef enum dsl_scan_flags { | |
72 | DSF_VISIT_DS_AGAIN = 1<<0, | |
73 | } dsl_scan_flags_t; | |
74 | ||
75 | #define DSL_SCAN_FLAGS_MASK (DSF_VISIT_DS_AGAIN) | |
76 | ||
77 | /* | |
78 | * Every pool will have one dsl_scan_t and this structure will contain | |
79 | * in-memory information about the scan and a pointer to the on-disk | |
80 | * representation (i.e. dsl_scan_phys_t). Most of the state of the scan | |
81 | * is contained on-disk to allow the scan to resume in the event of a reboot | |
82 | * or panic. This structure maintains information about the behavior of a | |
83 | * running scan, some caching information, and how it should traverse the pool. | |
84 | * | |
85 | * The following members of this structure direct the behavior of the scan: | |
86 | * | |
87 | * scn_pausing - a scan that cannot be completed in a single txg or | |
88 | * has exceeded its allotted time will need to pause. | |
89 | * When this flag is set the scanner will stop traversing | |
90 | * the pool and write out the current state to disk. | |
91 | * | |
92 | * scn_restart_txg - directs the scanner to either restart or start a | |
93 | * a scan at the specified txg value. | |
94 | * | |
95 | * scn_done_txg - when a scan completes its traversal it will set | |
96 | * the completion txg to the next txg. This is necessary | |
97 | * to ensure that any blocks that were freed during | |
98 | * the scan but have not yet been processed (i.e deferred | |
99 | * frees) are accounted for. | |
100 | * | |
101 | * This structure also maintains information about deferred frees which are | |
102 | * a special kind of traversal. Deferred free can exist in either a bptree or | |
103 | * a bpobj structure. The scn_is_bptree flag will indicate the type of | |
104 | * deferred free that is in progress. If the deferred free is part of an | |
105 | * asynchronous destroy then the scn_async_destroying flag will be set. | |
106 | */ | |
107 | typedef struct dsl_scan { | |
108 | struct dsl_pool *scn_dp; | |
109 | ||
110 | boolean_t scn_pausing; | |
111 | uint64_t scn_restart_txg; | |
112 | uint64_t scn_done_txg; | |
113 | uint64_t scn_sync_start_time; | |
114 | zio_t *scn_zio_root; | |
115 | ||
116 | /* for freeing blocks */ | |
117 | boolean_t scn_is_bptree; | |
118 | boolean_t scn_async_destroying; | |
119 | boolean_t scn_async_stalled; | |
120 | ||
121 | /* for debugging / information */ | |
122 | uint64_t scn_visited_this_txg; | |
123 | ||
124 | dsl_scan_phys_t scn_phys; | |
125 | } dsl_scan_t; | |
126 | ||
127 | int dsl_scan_init(struct dsl_pool *dp, uint64_t txg); | |
128 | void dsl_scan_fini(struct dsl_pool *dp); | |
129 | void dsl_scan_sync(struct dsl_pool *, dmu_tx_t *); | |
130 | int dsl_scan_cancel(struct dsl_pool *); | |
131 | int dsl_scan(struct dsl_pool *, pool_scan_func_t); | |
132 | void dsl_resilver_restart(struct dsl_pool *, uint64_t txg); | |
133 | boolean_t dsl_scan_resilvering(struct dsl_pool *dp); | |
134 | boolean_t dsl_dataset_unstable(struct dsl_dataset *ds); | |
135 | void dsl_scan_ddt_entry(dsl_scan_t *scn, enum zio_checksum checksum, | |
136 | ddt_entry_t *dde, dmu_tx_t *tx); | |
137 | void dsl_scan_ds_destroyed(struct dsl_dataset *ds, struct dmu_tx *tx); | |
138 | void dsl_scan_ds_snapshotted(struct dsl_dataset *ds, struct dmu_tx *tx); | |
139 | void dsl_scan_ds_clone_swapped(struct dsl_dataset *ds1, struct dsl_dataset *ds2, | |
140 | struct dmu_tx *tx); | |
141 | boolean_t dsl_scan_active(dsl_scan_t *scn); | |
142 | ||
143 | #ifdef __cplusplus | |
144 | } | |
145 | #endif | |
146 | ||
147 | #endif /* _SYS_DSL_SCAN_H */ |