include/sys/vdev_raidz.h

   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 https://opensource.org/licenses/CDDL-1.0.
  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) 2016 Gvozden Neskovic <neskovic@compeng.uni-frankfurt.de>.
  23  */
  24
  25 #ifndef _SYS_VDEV_RAIDZ_H
  26 #define _SYS_VDEV_RAIDZ_H
  27
  28 #include <sys/types.h>
  29 #include <sys/zfs_rlock.h>
  30
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 struct zio;
  36 struct raidz_col;
  37 struct raidz_row;
  38 struct raidz_map;
  39 struct vdev_raidz;
  40 struct uberblock;
  41 #if !defined(_KERNEL)
  42 struct kernel_param {};
  43 #endif
  44
  45 /*
  46  * vdev_raidz interface
  47  */
  48 struct raidz_map *vdev_raidz_map_alloc(struct zio *, uint64_t, uint64_t,
  49     uint64_t);
  50 struct raidz_map *vdev_raidz_map_alloc_expanded(struct zio *,
  51     uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, boolean_t);
  52 void vdev_raidz_map_free(struct raidz_map *);
  53 void vdev_raidz_free(struct vdev_raidz *);
  54 void vdev_raidz_generate_parity_row(struct raidz_map *, struct raidz_row *);
  55 void vdev_raidz_generate_parity(struct raidz_map *);
  56 void vdev_raidz_reconstruct(struct raidz_map *, const int *, int);
  57 void vdev_raidz_child_done(zio_t *);
  58 void vdev_raidz_io_done(zio_t *);
  59 void vdev_raidz_checksum_error(zio_t *, struct raidz_col *, abd_t *);
  60 struct raidz_row *vdev_raidz_row_alloc(int, zio_t *);
  61 void vdev_raidz_reflow_copy_scratch(spa_t *);
  62 void raidz_dtl_reassessed(vdev_t *);
  63
  64 extern const zio_vsd_ops_t vdev_raidz_vsd_ops;
  65
  66 /*
  67  * vdev_raidz_math interface
  68  */
  69 void vdev_raidz_math_init(void);
  70 void vdev_raidz_math_fini(void);
  71 const struct raidz_impl_ops *vdev_raidz_math_get_ops(void);
  72 int vdev_raidz_math_generate(struct raidz_map *, struct raidz_row *);
  73 int vdev_raidz_math_reconstruct(struct raidz_map *, struct raidz_row *,
  74     const int *, const int *, const int);
  75 int vdev_raidz_impl_set(const char *);
  76
  77 typedef struct vdev_raidz_expand {
  78         uint64_t vre_vdev_id;
  79
  80         kmutex_t vre_lock;
  81         kcondvar_t vre_cv;
  82
  83         /*
  84          * How much i/o is outstanding (issued and not completed).
  85          */
  86         uint64_t vre_outstanding_bytes;
  87
  88         /*
  89          * Next offset to issue i/o for.
  90          */
  91         uint64_t vre_offset;
  92
  93         /*
  94          * Lowest offset of a failed expansion i/o.  The expansion will retry
  95          * from here.  Once the expansion thread notices the failure and exits,
  96          * vre_failed_offset is reset back to UINT64_MAX, and
  97          * vre_waiting_for_resilver will be set.
  98          */
  99         uint64_t vre_failed_offset;
 100         boolean_t vre_waiting_for_resilver;
 101
 102         /*
 103          * Offset that is completing each txg
 104          */
 105         uint64_t vre_offset_pertxg[TXG_SIZE];
 106
 107         /*
 108          * Bytes copied in each txg.
 109          */
 110         uint64_t vre_bytes_copied_pertxg[TXG_SIZE];
 111
 112         /*
 113          * The rangelock prevents normal read/write zio's from happening while
 114          * there are expansion (reflow) i/os in progress to the same offsets.
 115          */
 116         zfs_rangelock_t vre_rangelock;
 117
 118         /*
 119          * These fields are stored on-disk in the vdev_top_zap:
 120          */
 121         dsl_scan_state_t vre_state;
 122         uint64_t vre_start_time;
 123         uint64_t vre_end_time;
 124         uint64_t vre_bytes_copied;
 125 } vdev_raidz_expand_t;
 126
 127 typedef struct vdev_raidz {
 128         /*
 129          * Number of child vdevs when this raidz vdev was created (i.e. before
 130          * any raidz expansions).
 131          */
 132         int vd_original_width;
 133
 134         /*
 135          * The current number of child vdevs, which may be more than the
 136          * original width if an expansion is in progress or has completed.
 137          */
 138         int vd_physical_width;
 139
 140         int vd_nparity;
 141
 142         /*
 143          * Tree of reflow_node_t's.  The lock protects the avl tree only.
 144          * The reflow_node_t's describe completed expansions, and are used
 145          * to determine the logical width given a block's birth time.
 146          */
 147         avl_tree_t vd_expand_txgs;
 148         kmutex_t vd_expand_lock;
 149
 150         /*
 151          * If this vdev is being expanded, spa_raidz_expand is set to this
 152          */
 153         vdev_raidz_expand_t vn_vre;
 154 } vdev_raidz_t;
 155
 156 extern int vdev_raidz_attach_check(vdev_t *);
 157 extern void vdev_raidz_attach_sync(void *, dmu_tx_t *);
 158 extern void spa_start_raidz_expansion_thread(spa_t *);
 159 extern int spa_raidz_expand_get_stats(spa_t *, pool_raidz_expand_stat_t *);
 160 extern int vdev_raidz_load(vdev_t *);
 161
 162 /* RAIDZ scratch area pause points (for testing) */
 163 #define RAIDZ_EXPAND_PAUSE_NONE 0
 164 #define RAIDZ_EXPAND_PAUSE_PRE_SCRATCH_1 1
 165 #define RAIDZ_EXPAND_PAUSE_PRE_SCRATCH_2 2
 166 #define RAIDZ_EXPAND_PAUSE_PRE_SCRATCH_3 3
 167 #define RAIDZ_EXPAND_PAUSE_SCRATCH_VALID 4
 168 #define RAIDZ_EXPAND_PAUSE_SCRATCH_REFLOWED 5
 169 #define RAIDZ_EXPAND_PAUSE_SCRATCH_POST_REFLOW_1 6
 170 #define RAIDZ_EXPAND_PAUSE_SCRATCH_POST_REFLOW_2 7
 171
 172 #ifdef  __cplusplus
 173 }
 174 #endif
 175
 176 #endif /* _SYS_VDEV_RAIDZ_H */