1 | /* $NetBSD: rf_interdecluster.c,v 1.14 2006/11/16 01:33:23 christos Exp $ */ |
2 | /* |
3 | * Copyright (c) 1995 Carnegie-Mellon University. |
4 | * All rights reserved. |
5 | * |
6 | * Author: Khalil Amiri |
7 | * |
8 | * Permission to use, copy, modify and distribute this software and |
9 | * its documentation is hereby granted, provided that both the copyright |
10 | * notice and this permission notice appear in all copies of the |
11 | * software, derivative works or modified versions, and any portions |
12 | * thereof, and that both notices appear in supporting documentation. |
13 | * |
14 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
15 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND |
16 | * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
17 | * |
18 | * Carnegie Mellon requests users of this software to return to |
19 | * |
20 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
21 | * School of Computer Science |
22 | * Carnegie Mellon University |
23 | * Pittsburgh PA 15213-3890 |
24 | * |
25 | * any improvements or extensions that they make and grant Carnegie the |
26 | * rights to redistribute these changes. |
27 | */ |
28 | |
29 | /************************************************************ |
30 | * |
31 | * rf_interdecluster.c -- implements interleaved declustering |
32 | * |
33 | ************************************************************/ |
34 | |
35 | #include <sys/cdefs.h> |
36 | __KERNEL_RCSID(0, "$NetBSD: rf_interdecluster.c,v 1.14 2006/11/16 01:33:23 christos Exp $" ); |
37 | |
38 | #include "rf_archs.h" |
39 | |
40 | #if RF_INCLUDE_INTERDECLUSTER > 0 |
41 | |
42 | #include <dev/raidframe/raidframevar.h> |
43 | |
44 | #include "rf_raid.h" |
45 | #include "rf_interdecluster.h" |
46 | #include "rf_dag.h" |
47 | #include "rf_dagutils.h" |
48 | #include "rf_dagfuncs.h" |
49 | #include "rf_general.h" |
50 | #include "rf_utils.h" |
51 | #include "rf_dagffrd.h" |
52 | #include "rf_dagdegrd.h" |
53 | #include "rf_dagffwr.h" |
54 | #include "rf_dagdegwr.h" |
55 | |
56 | typedef struct RF_InterdeclusterConfigInfo_s { |
57 | RF_RowCol_t **stripeIdentifier; /* filled in at config time and used |
58 | * by IdentifyStripe */ |
59 | RF_StripeCount_t numSparingRegions; |
60 | RF_StripeCount_t stripeUnitsPerSparingRegion; |
61 | RF_SectorNum_t mirrorStripeOffset; |
62 | } RF_InterdeclusterConfigInfo_t; |
63 | |
64 | int |
65 | rf_ConfigureInterDecluster( |
66 | RF_ShutdownList_t ** listp, |
67 | RF_Raid_t * raidPtr, |
68 | RF_Config_t * cfgPtr) |
69 | { |
70 | RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; |
71 | RF_StripeCount_t num_used_stripeUnitsPerDisk; |
72 | RF_InterdeclusterConfigInfo_t *info; |
73 | RF_RowCol_t i, tmp, SUs_per_region; |
74 | |
75 | /* create an Interleaved Declustering configuration structure */ |
76 | RF_MallocAndAdd(info, sizeof(RF_InterdeclusterConfigInfo_t), (RF_InterdeclusterConfigInfo_t *), |
77 | raidPtr->cleanupList); |
78 | if (info == NULL) |
79 | return (ENOMEM); |
80 | layoutPtr->layoutSpecificInfo = (void *) info; |
81 | |
82 | /* fill in the config structure. */ |
83 | SUs_per_region = raidPtr->numCol * (raidPtr->numCol - 1); |
84 | info->stripeIdentifier = rf_make_2d_array(SUs_per_region, 2, raidPtr->cleanupList); |
85 | if (info->stripeIdentifier == NULL) |
86 | return (ENOMEM); |
87 | for (i = 0; i < SUs_per_region; i++) { |
88 | info->stripeIdentifier[i][0] = i / (raidPtr->numCol - 1); |
89 | tmp = i / raidPtr->numCol; |
90 | info->stripeIdentifier[i][1] = (i + 1 + tmp) % raidPtr->numCol; |
91 | } |
92 | |
93 | /* fill in the remaining layout parameters */ |
94 | |
95 | /* total number of stripes should a multiple of 2*numCol: Each sparing |
96 | * region consists of 2*numCol stripes: n-1 primary copy, n-1 |
97 | * secondary copy and 2 for spare .. */ |
98 | num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk % |
99 | (2 * raidPtr->numCol)); |
100 | info->numSparingRegions = num_used_stripeUnitsPerDisk / (2 * raidPtr->numCol); |
101 | /* this is in fact the number of stripe units (that are primary data |
102 | * copies) in the sparing region */ |
103 | info->stripeUnitsPerSparingRegion = raidPtr->numCol * (raidPtr->numCol - 1); |
104 | info->mirrorStripeOffset = info->numSparingRegions * (raidPtr->numCol + 1); |
105 | layoutPtr->numStripe = info->numSparingRegions * info->stripeUnitsPerSparingRegion; |
106 | layoutPtr->numDataCol = 1; |
107 | layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; |
108 | layoutPtr->numParityCol = 1; |
109 | |
110 | layoutPtr->dataStripeUnitsPerDisk = num_used_stripeUnitsPerDisk; |
111 | |
112 | raidPtr->sectorsPerDisk = |
113 | num_used_stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit; |
114 | |
115 | raidPtr->totalSectors = |
116 | (layoutPtr->numStripe) * layoutPtr->sectorsPerStripeUnit; |
117 | |
118 | layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit; |
119 | |
120 | return (0); |
121 | } |
122 | |
123 | int |
124 | rf_GetDefaultNumFloatingReconBuffersInterDecluster(RF_Raid_t * raidPtr) |
125 | { |
126 | return (30); |
127 | } |
128 | |
129 | RF_HeadSepLimit_t |
130 | rf_GetDefaultHeadSepLimitInterDecluster(RF_Raid_t * raidPtr) |
131 | { |
132 | return (raidPtr->sectorsPerDisk); |
133 | } |
134 | |
135 | RF_ReconUnitCount_t |
136 | rf_GetNumSpareRUsInterDecluster( |
137 | RF_Raid_t * raidPtr) |
138 | { |
139 | RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo; |
140 | |
141 | return (2 * ((RF_ReconUnitCount_t) info->numSparingRegions)); |
142 | /* the layout uses two stripe units per disk as spare within each |
143 | * sparing region */ |
144 | } |
145 | /* Maps to the primary copy of the data, i.e. the first mirror pair */ |
146 | void |
147 | rf_MapSectorInterDecluster( |
148 | RF_Raid_t * raidPtr, |
149 | RF_RaidAddr_t raidSector, |
150 | RF_RowCol_t * col, |
151 | RF_SectorNum_t * diskSector, |
152 | int remap) |
153 | { |
154 | RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo; |
155 | RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; |
156 | RF_StripeNum_t su_offset_into_disk, mirror_su_offset_into_disk; |
157 | RF_StripeNum_t sparing_region_id, index_within_region; |
158 | int col_before_remap; |
159 | |
160 | sparing_region_id = SUID / info->stripeUnitsPerSparingRegion; |
161 | index_within_region = SUID % info->stripeUnitsPerSparingRegion; |
162 | su_offset_into_disk = index_within_region % (raidPtr->numCol - 1); |
163 | mirror_su_offset_into_disk = index_within_region / raidPtr->numCol; |
164 | col_before_remap = index_within_region / (raidPtr->numCol - 1); |
165 | |
166 | if (!remap) { |
167 | *col = col_before_remap; |
168 | *diskSector = (su_offset_into_disk + ((raidPtr->numCol - 1) * sparing_region_id)) * |
169 | raidPtr->Layout.sectorsPerStripeUnit; |
170 | *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit); |
171 | } else { |
172 | /* remap sector to spare space... */ |
173 | *diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit; |
174 | *diskSector += (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit; |
175 | *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit); |
176 | *col = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol; |
177 | *col = (*col + 1) % raidPtr->numCol; |
178 | if (*col == col_before_remap) |
179 | *col = (*col + 1) % raidPtr->numCol; |
180 | } |
181 | } |
182 | /* Maps to the second copy of the mirror pair. */ |
183 | void |
184 | rf_MapParityInterDecluster( |
185 | RF_Raid_t * raidPtr, |
186 | RF_RaidAddr_t raidSector, |
187 | RF_RowCol_t * col, |
188 | RF_SectorNum_t * diskSector, |
189 | int remap) |
190 | { |
191 | RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo; |
192 | RF_StripeNum_t sparing_region_id, index_within_region, mirror_su_offset_into_disk; |
193 | RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; |
194 | int col_before_remap; |
195 | |
196 | sparing_region_id = SUID / info->stripeUnitsPerSparingRegion; |
197 | index_within_region = SUID % info->stripeUnitsPerSparingRegion; |
198 | mirror_su_offset_into_disk = index_within_region / raidPtr->numCol; |
199 | col_before_remap = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol; |
200 | |
201 | if (!remap) { |
202 | *col = col_before_remap; |
203 | *diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit; |
204 | *diskSector += sparing_region_id * (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit; |
205 | *diskSector += mirror_su_offset_into_disk * raidPtr->Layout.sectorsPerStripeUnit; |
206 | *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit); |
207 | } else { |
208 | /* remap parity to spare space ... */ |
209 | *diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit; |
210 | *diskSector += (raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit; |
211 | *diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit); |
212 | *col = index_within_region / (raidPtr->numCol - 1); |
213 | *col = (*col + 1) % raidPtr->numCol; |
214 | if (*col == col_before_remap) |
215 | *col = (*col + 1) % raidPtr->numCol; |
216 | } |
217 | } |
218 | |
219 | void |
220 | rf_IdentifyStripeInterDecluster( |
221 | RF_Raid_t * raidPtr, |
222 | RF_RaidAddr_t addr, |
223 | RF_RowCol_t ** diskids) |
224 | { |
225 | RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo; |
226 | RF_StripeNum_t SUID; |
227 | |
228 | SUID = addr / raidPtr->Layout.sectorsPerStripeUnit; |
229 | SUID = SUID % info->stripeUnitsPerSparingRegion; |
230 | |
231 | *diskids = info->stripeIdentifier[SUID]; |
232 | } |
233 | |
234 | void |
235 | rf_MapSIDToPSIDInterDecluster( |
236 | RF_RaidLayout_t * layoutPtr, |
237 | RF_StripeNum_t stripeID, |
238 | RF_StripeNum_t * psID, |
239 | RF_ReconUnitNum_t * which_ru) |
240 | { |
241 | *which_ru = 0; |
242 | *psID = stripeID; |
243 | } |
244 | /****************************************************************************** |
245 | * select a graph to perform a single-stripe access |
246 | * |
247 | * Parameters: raidPtr - description of the physical array |
248 | * type - type of operation (read or write) requested |
249 | * asmap - logical & physical addresses for this access |
250 | * createFunc - name of function to use to create the graph |
251 | *****************************************************************************/ |
252 | |
253 | void |
254 | rf_RAIDIDagSelect( |
255 | RF_Raid_t * raidPtr, |
256 | RF_IoType_t type, |
257 | RF_AccessStripeMap_t * asmap, |
258 | RF_VoidFuncPtr * createFunc) |
259 | { |
260 | RF_ASSERT(RF_IO_IS_R_OR_W(type)); |
261 | |
262 | if (asmap->numDataFailed + asmap->numParityFailed > 1) { |
263 | RF_ERRORMSG("Multiple disks failed in a single group! Aborting I/O operation.\n" ); |
264 | *createFunc = NULL; |
265 | return; |
266 | } |
267 | *createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG; |
268 | if (type == RF_IO_TYPE_READ) { |
269 | if (asmap->numDataFailed == 0) |
270 | *createFunc = (RF_VoidFuncPtr) rf_CreateMirrorPartitionReadDAG; |
271 | else |
272 | *createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneDegradedReadDAG; |
273 | } else |
274 | *createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG; |
275 | } |
276 | #endif /* RF_INCLUDE_INTERDECLUSTER > 0 */ |
277 | |