1 | /* $NetBSD: rf_psstatus.h,v 1.14 2011/05/03 08:18:43 mrg Exp $ */ |
2 | /* |
3 | * Copyright (c) 1995 Carnegie-Mellon University. |
4 | * All rights reserved. |
5 | * |
6 | * Author: Mark Holland |
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 | * psstatus.h |
32 | * |
33 | * The reconstruction code maintains a bunch of status related to the parity |
34 | * stripes that are currently under reconstruction. This header file defines |
35 | * the status structures. |
36 | * |
37 | *****************************************************************************/ |
38 | |
39 | #ifndef _RF__RF_PSSTATUS_H_ |
40 | #define _RF__RF_PSSTATUS_H_ |
41 | |
42 | #include <dev/raidframe/raidframevar.h> |
43 | |
44 | #include "rf_threadstuff.h" |
45 | #include "rf_callback.h" |
46 | |
47 | #define RF_PS_MAX_BUFS 10 /* max number of bufs we'll accumulate before |
48 | * we do an XOR */ |
49 | |
50 | #define RF_PSS_DEFAULT_TABLESIZE 200 |
51 | |
52 | /* |
53 | * Macros to acquire/release the mutex lock on a parity stripe status |
54 | * descriptor. Note that we use just one lock for the whole hash chain. |
55 | */ |
56 | #define RF_HASH_PSID(_raid_,_psid_) ( (_psid_) % ((_raid_)->pssTableSize) ) /* simple hash function */ |
57 | #define RF_LOCK_PSS_MUTEX(_raidPtr, _psid) \ |
58 | do { \ |
59 | rf_lock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ |
60 | while((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock) { \ |
61 | rf_wait_cond2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].cond,\ |
62 | (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex);\ |
63 | } \ |
64 | (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 1; \ |
65 | rf_unlock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex);\ |
66 | } while (0); |
67 | |
68 | #define RF_UNLOCK_PSS_MUTEX(_raidPtr, _psid) \ |
69 | rf_lock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); \ |
70 | (_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].lock = 0; \ |
71 | rf_broadcast_cond2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].cond); \ |
72 | rf_unlock_mutex2((_raidPtr)->reconControl->pssTable[ RF_HASH_PSID(_raidPtr,_psid) ].mutex); |
73 | |
74 | struct RF_ReconParityStripeStatus_s { |
75 | RF_StripeNum_t parityStripeID; /* the parity stripe ID */ |
76 | RF_ReconUnitNum_t which_ru; /* which reconstruction unit with the |
77 | * indicated parity stripe */ |
78 | RF_PSSFlags_t flags; /* flags indicating various conditions */ |
79 | void *rbuf; /* this is the accumulating xor sum */ |
80 | void *writeRbuf; /* DEBUG ONLY: a pointer to the rbuf after it |
81 | * has filled & been sent to disk */ |
82 | void *rbufsForXor[RF_PS_MAX_BUFS]; /* these are buffers still to |
83 | * be xored into the |
84 | * accumulating sum */ |
85 | int xorBufCount; /* num buffers waiting to be xored */ |
86 | int blockCount; /* count of # proc that have blocked recon on |
87 | * this parity stripe */ |
88 | char issued[RF_MAXCOL]; /* issued[i]==1 <=> column i has already |
89 | * issued a read request for the indicated RU */ |
90 | RF_CallbackDesc_t *procWaitList; /* list of user procs waiting |
91 | * for recon to be done */ |
92 | RF_CallbackDesc_t *blockWaitList; /* list of disks blocked |
93 | * waiting for user write to |
94 | * complete */ |
95 | RF_CallbackDesc_t *bufWaitList; /* list of disks blocked waiting to |
96 | * acquire a buffer for this RU */ |
97 | RF_ReconParityStripeStatus_t *next; |
98 | }; |
99 | |
100 | struct { |
101 | rf_declare_mutex2(); /* mutex for this hash chain */ |
102 | rf_declare_cond2(); /* and cv for it */ |
103 | int ; /* 1 if this hash chain is locked, |
104 | 0 otherwise */ |
105 | RF_ReconParityStripeStatus_t *; /* the hash chain */ |
106 | }; |
107 | /* masks for the "flags" field above */ |
108 | #define RF_PSS_NONE 0x00000000 /* no flags */ |
109 | #define RF_PSS_UNDER_RECON 0x00000001 /* this parity stripe is |
110 | * currently under |
111 | * reconstruction */ |
112 | #define RF_PSS_FORCED_ON_WRITE 0x00000002 /* indicates a recon was |
113 | * forced due to a user-write |
114 | * operation */ |
115 | #define RF_PSS_FORCED_ON_READ 0x00000004 /* ditto for read, but not |
116 | * currently implemented */ |
117 | #define RF_PSS_RECON_BLOCKED 0x00000008 /* reconstruction is currently |
118 | * blocked due to a pending |
119 | * user I/O */ |
120 | #define RF_PSS_CREATE 0x00000010 /* tells LookupRUStatus to |
121 | * create the entry */ |
122 | #define RF_PSS_BUFFERWAIT 0x00000020 /* someone is waiting for a |
123 | * buffer for this RU */ |
124 | |
125 | int rf_ConfigurePSStatus(RF_ShutdownList_t **); |
126 | void rf_InitPSStatus(RF_Raid_t *); |
127 | RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(RF_Raid_t *); |
128 | void rf_FreeParityStripeStatusTable(RF_Raid_t *, RF_PSStatusHeader_t *); |
129 | RF_ReconParityStripeStatus_t *rf_LookupRUStatus(RF_Raid_t *, RF_PSStatusHeader_t *, |
130 | RF_StripeNum_t, RF_ReconUnitNum_t, |
131 | RF_PSSFlags_t, |
132 | RF_ReconParityStripeStatus_t *); |
133 | void rf_PSStatusDelete(RF_Raid_t *, RF_PSStatusHeader_t *, |
134 | RF_ReconParityStripeStatus_t *); |
135 | void rf_RemoveFromActiveReconTable(RF_Raid_t *, RF_StripeNum_t, RF_ReconUnitNum_t); |
136 | RF_ReconParityStripeStatus_t *rf_AllocPSStatus(RF_Raid_t *); |
137 | void rf_FreePSStatus(RF_Raid_t *, RF_ReconParityStripeStatus_t *); |
138 | void rf_PrintPSStatusTable(RF_Raid_t *); |
139 | |
140 | #endif /* !_RF__RF_PSSTATUS_H_ */ |
141 | |