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[FreeBSD/releng/10.3.git] / sys / cddl / contrib / opensolaris / uts / common / fs / zfs / sys / vdev_impl.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 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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24  */
25
26 #ifndef _SYS_VDEV_IMPL_H
27 #define _SYS_VDEV_IMPL_H
28
29 #include <sys/avl.h>
30 #include <sys/dmu.h>
31 #include <sys/metaslab.h>
32 #include <sys/nvpair.h>
33 #include <sys/space_map.h>
34 #include <sys/vdev.h>
35 #include <sys/dkio.h>
36 #include <sys/uberblock_impl.h>
37
38 #ifdef  __cplusplus
39 extern "C" {
40 #endif
41
42 /*
43  * Virtual device descriptors.
44  *
45  * All storage pool operations go through the virtual device framework,
46  * which provides data replication and I/O scheduling.
47  */
48
49 /*
50  * Forward declarations that lots of things need.
51  */
52 typedef struct vdev_queue vdev_queue_t;
53 typedef struct vdev_cache vdev_cache_t;
54 typedef struct vdev_cache_entry vdev_cache_entry_t;
55
56 /*
57  * Virtual device operations
58  */
59 typedef int     vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *max_size,
60     uint64_t *logical_ashift, uint64_t *physical_ashift);
61 typedef void    vdev_close_func_t(vdev_t *vd);
62 typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
63 typedef int     vdev_io_start_func_t(zio_t *zio);
64 typedef void    vdev_io_done_func_t(zio_t *zio);
65 typedef void    vdev_state_change_func_t(vdev_t *vd, int, int);
66 typedef void    vdev_hold_func_t(vdev_t *vd);
67 typedef void    vdev_rele_func_t(vdev_t *vd);
68
69 typedef struct vdev_ops {
70         vdev_open_func_t                *vdev_op_open;
71         vdev_close_func_t               *vdev_op_close;
72         vdev_asize_func_t               *vdev_op_asize;
73         vdev_io_start_func_t            *vdev_op_io_start;
74         vdev_io_done_func_t             *vdev_op_io_done;
75         vdev_state_change_func_t        *vdev_op_state_change;
76         vdev_hold_func_t                *vdev_op_hold;
77         vdev_rele_func_t                *vdev_op_rele;
78         char                            vdev_op_type[16];
79         boolean_t                       vdev_op_leaf;
80 } vdev_ops_t;
81
82 /*
83  * Virtual device properties
84  */
85 struct vdev_cache_entry {
86         char            *ve_data;
87         uint64_t        ve_offset;
88         uint64_t        ve_lastused;
89         avl_node_t      ve_offset_node;
90         avl_node_t      ve_lastused_node;
91         uint32_t        ve_hits;
92         uint16_t        ve_missed_update;
93         zio_t           *ve_fill_io;
94 };
95
96 struct vdev_cache {
97         avl_tree_t      vc_offset_tree;
98         avl_tree_t      vc_lastused_tree;
99         kmutex_t        vc_lock;
100 };
101
102 typedef struct vdev_queue_class {
103         uint32_t        vqc_active;
104
105         /*
106          * Sorted by offset or timestamp, depending on if the queue is
107          * LBA-ordered vs FIFO.
108          */
109         avl_tree_t      vqc_queued_tree;
110 } vdev_queue_class_t;
111
112 struct vdev_queue {
113         vdev_t          *vq_vdev;
114         vdev_queue_class_t vq_class[ZIO_PRIORITY_NUM_QUEUEABLE];
115         avl_tree_t      vq_active_tree;
116         avl_tree_t      vq_read_offset_tree;
117         avl_tree_t      vq_write_offset_tree;
118         uint64_t        vq_last_offset;
119         hrtime_t        vq_io_complete_ts; /* time last i/o completed */
120         kmutex_t        vq_lock;
121         uint64_t        vq_lastoffset;
122 };
123
124 /*
125  * Virtual device descriptor
126  */
127 struct vdev {
128         /*
129          * Common to all vdev types.
130          */
131         uint64_t        vdev_id;        /* child number in vdev parent  */
132         uint64_t        vdev_guid;      /* unique ID for this vdev      */
133         uint64_t        vdev_guid_sum;  /* self guid + all child guids  */
134         uint64_t        vdev_orig_guid; /* orig. guid prior to remove   */
135         uint64_t        vdev_asize;     /* allocatable device capacity  */
136         uint64_t        vdev_min_asize; /* min acceptable asize         */
137         uint64_t        vdev_max_asize; /* max acceptable asize         */
138         uint64_t        vdev_ashift;    /* block alignment shift        */
139         /*
140          * Logical block alignment shift
141          *
142          * The smallest sized/aligned I/O supported by the device.
143          */
144         uint64_t        vdev_logical_ashift;
145         /*
146          * Physical block alignment shift
147          *
148          * The device supports logical I/Os with vdev_logical_ashift
149          * size/alignment, but optimum performance will be achieved by
150          * aligning/sizing requests to vdev_physical_ashift.  Smaller
151          * requests may be inflated or incur device level read-modify-write
152          * operations.
153          *
154          * May be 0 to indicate no preference (i.e. use vdev_logical_ashift).
155          */
156         uint64_t        vdev_physical_ashift;
157         uint64_t        vdev_state;     /* see VDEV_STATE_* #defines    */
158         uint64_t        vdev_prevstate; /* used when reopening a vdev   */
159         vdev_ops_t      *vdev_ops;      /* vdev operations              */
160         spa_t           *vdev_spa;      /* spa for this vdev            */
161         void            *vdev_tsd;      /* type-specific data           */
162         vnode_t         *vdev_name_vp;  /* vnode for pathname           */
163         vnode_t         *vdev_devid_vp; /* vnode for devid              */
164         vdev_t          *vdev_top;      /* top-level vdev               */
165         vdev_t          *vdev_parent;   /* parent vdev                  */
166         vdev_t          **vdev_child;   /* array of children            */
167         uint64_t        vdev_children;  /* number of children           */
168         vdev_stat_t     vdev_stat;      /* virtual device statistics    */
169         boolean_t       vdev_expanding; /* expand the vdev?             */
170         boolean_t       vdev_reopening; /* reopen in progress?          */
171         int             vdev_open_error; /* error on last open          */
172         kthread_t       *vdev_open_thread; /* thread opening children   */
173         uint64_t        vdev_crtxg;     /* txg when top-level was added */
174
175         /*
176          * Top-level vdev state.
177          */
178         uint64_t        vdev_ms_array;  /* metaslab array object        */
179         uint64_t        vdev_ms_shift;  /* metaslab size shift          */
180         uint64_t        vdev_ms_count;  /* number of metaslabs          */
181         metaslab_group_t *vdev_mg;      /* metaslab group               */
182         metaslab_t      **vdev_ms;      /* metaslab array               */
183         txg_list_t      vdev_ms_list;   /* per-txg dirty metaslab lists */
184         txg_list_t      vdev_dtl_list;  /* per-txg dirty DTL lists      */
185         txg_node_t      vdev_txg_node;  /* per-txg dirty vdev linkage   */
186         boolean_t       vdev_remove_wanted; /* async remove wanted?     */
187         boolean_t       vdev_probe_wanted; /* async probe wanted?       */
188         list_node_t     vdev_config_dirty_node; /* config dirty list    */
189         list_node_t     vdev_state_dirty_node; /* state dirty list      */
190         uint64_t        vdev_deflate_ratio; /* deflation ratio (x512)   */
191         uint64_t        vdev_islog;     /* is an intent log device      */
192         uint64_t        vdev_removing;  /* device is being removed?     */
193         boolean_t       vdev_ishole;    /* is a hole in the namespace   */
194
195         /*
196          * Leaf vdev state.
197          */
198         range_tree_t    *vdev_dtl[DTL_TYPES]; /* dirty time logs        */
199         space_map_t     *vdev_dtl_sm;   /* dirty time log space map     */
200         txg_node_t      vdev_dtl_node;  /* per-txg dirty DTL linkage    */
201         uint64_t        vdev_dtl_object; /* DTL object                  */
202         uint64_t        vdev_psize;     /* physical device capacity     */
203         uint64_t        vdev_wholedisk; /* true if this is a whole disk */
204         uint64_t        vdev_offline;   /* persistent offline state     */
205         uint64_t        vdev_faulted;   /* persistent faulted state     */
206         uint64_t        vdev_degraded;  /* persistent degraded state    */
207         uint64_t        vdev_removed;   /* persistent removed state     */
208         uint64_t        vdev_resilver_txg; /* persistent resilvering state */
209         uint64_t        vdev_nparity;   /* number of parity devices for raidz */
210         char            *vdev_path;     /* vdev path (if any)           */
211         char            *vdev_devid;    /* vdev devid (if any)          */
212         char            *vdev_physpath; /* vdev device path (if any)    */
213         char            *vdev_fru;      /* physical FRU location        */
214         uint64_t        vdev_not_present; /* not present during import  */
215         uint64_t        vdev_unspare;   /* unspare when resilvering done */
216         boolean_t       vdev_nowritecache; /* true if flushwritecache failed */
217         boolean_t       vdev_notrim;    /* true if trim failed */
218         boolean_t       vdev_checkremove; /* temporary online test      */
219         boolean_t       vdev_forcefault; /* force online fault          */
220         boolean_t       vdev_splitting; /* split or repair in progress  */
221         boolean_t       vdev_delayed_close; /* delayed device close?    */
222         boolean_t       vdev_tmpoffline; /* device taken offline temporarily? */
223         boolean_t       vdev_detached;  /* device detached?             */
224         boolean_t       vdev_cant_read; /* vdev is failing all reads    */
225         boolean_t       vdev_cant_write; /* vdev is failing all writes  */
226         boolean_t       vdev_isspare;   /* was a hot spare              */
227         boolean_t       vdev_isl2cache; /* was a l2cache device         */
228         vdev_queue_t    vdev_queue;     /* I/O deadline schedule queue  */
229         vdev_cache_t    vdev_cache;     /* physical block cache         */
230         spa_aux_vdev_t  *vdev_aux;      /* for l2cache and spares vdevs */
231         zio_t           *vdev_probe_zio; /* root of current probe       */
232         vdev_aux_t      vdev_label_aux; /* on-disk aux state            */
233         struct trim_map *vdev_trimmap;  /* map on outstanding trims     */ 
234         uint16_t        vdev_rotation_rate; /* rotational rate of the media */
235 #define VDEV_RATE_UNKNOWN       0
236 #define VDEV_RATE_NON_ROTATING  1
237
238         /*
239          * For DTrace to work in userland (libzpool) context, these fields must
240          * remain at the end of the structure.  DTrace will use the kernel's
241          * CTF definition for 'struct vdev', and since the size of a kmutex_t is
242          * larger in userland, the offsets for the rest of the fields would be
243          * incorrect.
244          */
245         kmutex_t        vdev_dtl_lock;  /* vdev_dtl_{map,resilver}      */
246         kmutex_t        vdev_stat_lock; /* vdev_stat                    */
247         kmutex_t        vdev_probe_lock; /* protects vdev_probe_zio     */
248 };
249
250 #define VDEV_RAIDZ_MAXPARITY    3
251
252 #define VDEV_PAD_SIZE           (8 << 10)
253 /* 2 padding areas (vl_pad1 and vl_pad2) to skip */
254 #define VDEV_SKIP_SIZE          VDEV_PAD_SIZE * 2
255 #define VDEV_PHYS_SIZE          (112 << 10)
256 #define VDEV_UBERBLOCK_RING     (128 << 10)
257
258 /* The largest uberblock we support is 8k. */
259 #define MAX_UBERBLOCK_SHIFT (13)
260 #define VDEV_UBERBLOCK_SHIFT(vd)        \
261         MIN(MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT), \
262             MAX_UBERBLOCK_SHIFT)
263 #define VDEV_UBERBLOCK_COUNT(vd)        \
264         (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
265 #define VDEV_UBERBLOCK_OFFSET(vd, n)    \
266         offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
267 #define VDEV_UBERBLOCK_SIZE(vd)         (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
268
269 typedef struct vdev_phys {
270         char            vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
271         zio_eck_t       vp_zbt;
272 } vdev_phys_t;
273
274 typedef struct vdev_label {
275         char            vl_pad1[VDEV_PAD_SIZE];                 /*  8K */
276         char            vl_pad2[VDEV_PAD_SIZE];                 /*  8K */
277         vdev_phys_t     vl_vdev_phys;                           /* 112K */
278         char            vl_uberblock[VDEV_UBERBLOCK_RING];      /* 128K */
279 } vdev_label_t;                                                 /* 256K total */
280
281 /*
282  * vdev_dirty() flags
283  */
284 #define VDD_METASLAB    0x01
285 #define VDD_DTL         0x02
286
287 /* Offset of embedded boot loader region on each label */
288 #define VDEV_BOOT_OFFSET        (2 * sizeof (vdev_label_t))
289 /*
290  * Size of embedded boot loader region on each label.
291  * The total size of the first two labels plus the boot area is 4MB.
292  */
293 #define VDEV_BOOT_SIZE          (7ULL << 19)                    /* 3.5M */
294
295 /*
296  * Size of label regions at the start and end of each leaf device.
297  */
298 #define VDEV_LABEL_START_SIZE   (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
299 #define VDEV_LABEL_END_SIZE     (2 * sizeof (vdev_label_t))
300 #define VDEV_LABELS             4
301 #define VDEV_BEST_LABEL         VDEV_LABELS
302
303 #define VDEV_ALLOC_LOAD         0
304 #define VDEV_ALLOC_ADD          1
305 #define VDEV_ALLOC_SPARE        2
306 #define VDEV_ALLOC_L2CACHE      3
307 #define VDEV_ALLOC_ROOTPOOL     4
308 #define VDEV_ALLOC_SPLIT        5
309 #define VDEV_ALLOC_ATTACH       6
310
311 /*
312  * Allocate or free a vdev
313  */
314 extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
315     vdev_ops_t *ops);
316 extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
317     vdev_t *parent, uint_t id, int alloctype);
318 extern void vdev_free(vdev_t *vd);
319
320 /*
321  * Add or remove children and parents
322  */
323 extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
324 extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
325 extern void vdev_compact_children(vdev_t *pvd);
326 extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
327 extern void vdev_remove_parent(vdev_t *cvd);
328
329 /*
330  * vdev sync load and sync
331  */
332 extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
333 extern boolean_t vdev_log_state_valid(vdev_t *vd);
334 extern void vdev_load(vdev_t *vd);
335 extern int vdev_dtl_load(vdev_t *vd);
336 extern void vdev_sync(vdev_t *vd, uint64_t txg);
337 extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
338 extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
339 extern void vdev_dirty_leaves(vdev_t *vd, int flags, uint64_t txg);
340
341 /*
342  * Available vdev types.
343  */
344 extern vdev_ops_t vdev_root_ops;
345 extern vdev_ops_t vdev_mirror_ops;
346 extern vdev_ops_t vdev_replacing_ops;
347 extern vdev_ops_t vdev_raidz_ops;
348 #ifdef _KERNEL
349 extern vdev_ops_t vdev_geom_ops;
350 #else
351 extern vdev_ops_t vdev_disk_ops;
352 #endif
353 extern vdev_ops_t vdev_file_ops;
354 extern vdev_ops_t vdev_missing_ops;
355 extern vdev_ops_t vdev_hole_ops;
356 extern vdev_ops_t vdev_spare_ops;
357
358 /*
359  * Common size functions
360  */
361 extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
362 extern uint64_t vdev_get_min_asize(vdev_t *vd);
363 extern void vdev_set_min_asize(vdev_t *vd);
364
365 /*
366  * Global variables
367  */
368 /* zdb uses this tunable, so it must be declared here to make lint happy. */
369 extern int zfs_vdev_cache_size;
370
371 #ifdef illumos
372 /*
373  * The vdev_buf_t is used to translate between zio_t and buf_t, and back again.
374  */
375 typedef struct vdev_buf {
376         buf_t   vb_buf;         /* buffer that describes the io */
377         zio_t   *vb_io;         /* pointer back to the original zio_t */
378 } vdev_buf_t;
379 #endif
380
381 #ifdef  __cplusplus
382 }
383 #endif
384
385 #endif  /* _SYS_VDEV_IMPL_H */