After much delay and anticipation, welcome RAIDFrame into the FreeBSD

world.  This should be considered highly experimental.

Approved-by:	re

1 files changed, 376 insertions, 0 deletions

diff --git a/sys/dev/raidframe/rf_psstatus.c b/sys/dev/raidframe/rf_psstatus.c
new file mode 100644
index 0000000..31c2be7
--- /dev/null
+++ b/sys/dev/raidframe/rf_psstatus.c
@@ -0,0 +1,376 @@
+/*	$FreeBSD$ */
+/*	$NetBSD: rf_psstatus.c,v 1.5 2000/01/08 22:57:31 oster Exp $	*/
+/*
+ * Copyright (c) 1995 Carnegie-Mellon University.
+ * All rights reserved.
+ *
+ * Author: Mark Holland
+ *
+ * Permission to use, copy, modify and distribute this software and
+ * its documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+/*****************************************************************************
+ *
+ * psstatus.c
+ *
+ * The reconstruction code maintains a bunch of status related to the parity
+ * stripes that are currently under reconstruction.  This header file defines
+ * the status structures.
+ *
+ *****************************************************************************/
+
+#include <dev/raidframe/rf_types.h>
+#include <dev/raidframe/rf_raid.h>
+#include <dev/raidframe/rf_general.h>
+#include <dev/raidframe/rf_debugprint.h>
+#include <dev/raidframe/rf_freelist.h>
+#include <dev/raidframe/rf_psstatus.h>
+#include <dev/raidframe/rf_shutdown.h>
+
+#define Dprintf1(s,a)         if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL)
+#define Dprintf2(s,a,b)       if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),NULL,NULL,NULL,NULL,NULL,NULL)
+#define Dprintf3(s,a,b,c)     if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),NULL,NULL,NULL,NULL,NULL)
+
+static void 
+RealPrintPSStatusTable(RF_Raid_t * raidPtr,
+    RF_PSStatusHeader_t * pssTable);
+
+#define RF_MAX_FREE_PSS  32
+#define RF_PSS_INC        8
+#define RF_PSS_INITIAL    4
+
+static int init_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *);
+static void clean_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *);
+static void rf_ShutdownPSStatus(void *);
+
+static int 
+init_pss(p, raidPtr)
+	RF_ReconParityStripeStatus_t *p;
+	RF_Raid_t *raidPtr;
+{
+	RF_Calloc(p->issued, raidPtr->numCol, sizeof(char), (char *));
+	if (p->issued == NULL)
+		return (ENOMEM);
+	return (0);
+}
+
+static void 
+clean_pss(p, raidPtr)
+	RF_ReconParityStripeStatus_t *p;
+	RF_Raid_t *raidPtr;
+{
+	RF_Free(p->issued, raidPtr->numCol * sizeof(char));
+}
+
+static void 
+rf_ShutdownPSStatus(arg)
+	void   *arg;
+{
+	RF_Raid_t *raidPtr = (RF_Raid_t *) arg;
+
+	RF_FREELIST_DESTROY_CLEAN_ARG(raidPtr->pss_freelist, next, (RF_ReconParityStripeStatus_t *), clean_pss, raidPtr);
+}
+
+int 
+rf_ConfigurePSStatus(
+    RF_ShutdownList_t ** listp,
+    RF_Raid_t * raidPtr,
+    RF_Config_t * cfgPtr)
+{
+	int     rc;
+
+	raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE;
+	RF_FREELIST_CREATE(raidPtr->pss_freelist, RF_MAX_FREE_PSS,
+	    RF_PSS_INC, sizeof(RF_ReconParityStripeStatus_t));
+	if (raidPtr->pss_freelist == NULL)
+		return (ENOMEM);
+	rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr);
+	if (rc) {
+		RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n",
+		    __FILE__, __LINE__, rc);
+		rf_ShutdownPSStatus(raidPtr);
+		return (rc);
+	}
+	RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL, next,
+	    (RF_ReconParityStripeStatus_t *), init_pss, raidPtr);
+	return (0);
+}
+/*****************************************************************************************
+ * sets up the pss table
+ * We pre-allocate a bunch of entries to avoid as much as possible having to
+ * malloc up hash chain entries.
+ ****************************************************************************************/
+RF_PSStatusHeader_t *
+rf_MakeParityStripeStatusTable(raidPtr)
+	RF_Raid_t *raidPtr;
+{
+	RF_PSStatusHeader_t *pssTable;
+	int     i, j, rc;
+
+	RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *));
+	for (i = 0; i < raidPtr->pssTableSize; i++) {
+		rc = rf_mutex_init(&pssTable[i].mutex, __FUNCTION__);
+		if (rc) {
+			RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__,
+			    __LINE__, rc);
+			/* fail and deallocate */
+			for (j = 0; j < i; j++) {
+				rf_mutex_destroy(&pssTable[i].mutex);
+			}
+			RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t));
+			return (NULL);
+		}
+	}
+	return (pssTable);
+}
+
+void 
+rf_FreeParityStripeStatusTable(raidPtr, pssTable)
+	RF_Raid_t *raidPtr;
+	RF_PSStatusHeader_t *pssTable;
+{
+	int     i;
+
+	if (rf_pssDebug)
+		RealPrintPSStatusTable(raidPtr, pssTable);
+	for (i = 0; i < raidPtr->pssTableSize; i++) {
+		if (pssTable[i].chain) {
+			printf("ERROR: pss hash chain not null at recon shutdown\n");
+		}
+		rf_mutex_destroy(&pssTable[i].mutex);
+	}
+	RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t));
+}
+
+
+/* looks up the status structure for a parity stripe.
+ * if the create_flag is on, creates and returns the status structure it it doesn't exist
+ * otherwise returns NULL if the status structure does not exist
+ *
+ * ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY
+ */
+RF_ReconParityStripeStatus_t *
+rf_LookupRUStatus(
+    RF_Raid_t * raidPtr,
+    RF_PSStatusHeader_t * pssTable,
+    RF_StripeNum_t psID,
+    RF_ReconUnitNum_t which_ru,
+    RF_PSSFlags_t flags,	/* whether or not to create it if it doesn't
+				 * exist + what flags to set initially */
+    int *created)
+{
+	RF_PSStatusHeader_t *hdr = &pssTable[RF_HASH_PSID(raidPtr, psID)];
+	RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain;
+
+	*created = 0;
+	for (p = pssPtr; p; p = p->next) {
+		if (p->parityStripeID == psID && p->which_ru == which_ru)
+			break;
+	}
+
+	if (!p && (flags & RF_PSS_CREATE)) {
+		Dprintf2("PSS: creating pss for psid %ld ru %d\n", psID, which_ru);
+		p = rf_AllocPSStatus(raidPtr);
+		p->next = hdr->chain;
+		hdr->chain = p;
+
+		p->parityStripeID = psID;
+		p->which_ru = which_ru;
+		p->flags = flags;
+		p->rbuf = NULL;
+		p->writeRbuf = NULL;
+		p->blockCount = 0;
+		p->procWaitList = NULL;
+		p->blockWaitList = NULL;
+		p->bufWaitList = NULL;
+		*created = 1;
+	} else
+		if (p) {	/* we didn't create, but we want to specify
+				 * some new status */
+			p->flags |= flags;	/* add in whatever flags we're
+						 * specifying */
+		}
+	if (p && (flags & RF_PSS_RECON_BLOCKED)) {
+		p->blockCount++;/* if we're asking to block recon, bump the
+				 * count */
+		Dprintf3("raid%d: Blocked recon on psid %ld.  count now %d\n",
+			 raidPtr->raidid, psID, p->blockCount);
+	}
+	return (p);
+}
+/* deletes an entry from the parity stripe status table.  typically used
+ * when an entry has been allocated solely to block reconstruction, and
+ * no recon was requested while recon was blocked.  Assumes the hash
+ * chain is ALREADY LOCKED.
+ */
+void 
+rf_PSStatusDelete(raidPtr, pssTable, pssPtr)
+	RF_Raid_t *raidPtr;
+	RF_PSStatusHeader_t *pssTable;
+	RF_ReconParityStripeStatus_t *pssPtr;
+{
+	RF_PSStatusHeader_t *hdr = &(pssTable[RF_HASH_PSID(raidPtr, pssPtr->parityStripeID)]);
+	RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL;
+
+	while (p) {
+		if (p == pssPtr) {
+			if (pt)
+				pt->next = p->next;
+			else
+				hdr->chain = p->next;
+			p->next = NULL;
+			rf_FreePSStatus(raidPtr, p);
+			return;
+		}
+		pt = p;
+		p = p->next;
+	}
+	RF_ASSERT(0);		/* we must find it here */
+}
+/* deletes an entry from the ps status table after reconstruction has completed */
+void 
+rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru)
+	RF_Raid_t *raidPtr;
+	RF_RowCol_t row;
+	RF_ReconUnitNum_t which_ru;
+	RF_StripeNum_t psid;
+{
+	RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[RF_HASH_PSID(raidPtr, psid)]);
+	RF_ReconParityStripeStatus_t *p, *pt;
+	RF_CallbackDesc_t *cb, *cb1;
+
+	RF_LOCK_MUTEX(hdr->mutex);
+	for (pt = NULL, p = hdr->chain; p; pt = p, p = p->next) {
+		if ((p->parityStripeID == psid) && (p->which_ru == which_ru))
+			break;
+	}
+	if (p == NULL) {
+		rf_PrintPSStatusTable(raidPtr, row);
+	}
+	RF_ASSERT(p);		/* it must be there */
+
+	Dprintf2("PSS: deleting pss for psid %ld ru %d\n", psid, which_ru);
+
+	/* delete this entry from the hash chain */
+	if (pt)
+		pt->next = p->next;
+	else
+		hdr->chain = p->next;
+	p->next = NULL;
+
+	RF_UNLOCK_MUTEX(hdr->mutex);
+
+	/* wakup anyone waiting on the parity stripe ID */
+	cb = p->procWaitList;
+	p->procWaitList = NULL;
+	while (cb) {
+		Dprintf1("Waking up access waiting on parity stripe ID %ld\n", p->parityStripeID);
+		cb1 = cb->next;
+		(cb->callbackFunc) (cb->callbackArg);
+
+		/* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus,
+		 * IMHO */
+		/* (cb->callbackFunc)(cb->callbackArg, 0); */
+		rf_FreeCallbackDesc(cb);
+		cb = cb1;
+	}
+
+	rf_FreePSStatus(raidPtr, p);
+}
+
+RF_ReconParityStripeStatus_t *
+rf_AllocPSStatus(raidPtr)
+	RF_Raid_t *raidPtr;
+{
+	RF_ReconParityStripeStatus_t *p;
+
+	RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist, p, next, (RF_ReconParityStripeStatus_t *), init_pss, raidPtr);
+	if (p) {
+		bzero(p->issued, raidPtr->numCol);
+	}
+	p->next = NULL;
+	/* no need to initialize here b/c the only place we're called from is
+	 * the above Lookup */
+	return (p);
+}
+
+void 
+rf_FreePSStatus(raidPtr, p)
+	RF_Raid_t *raidPtr;
+	RF_ReconParityStripeStatus_t *p;
+{
+	RF_ASSERT(p->procWaitList == NULL);
+	RF_ASSERT(p->blockWaitList == NULL);
+	RF_ASSERT(p->bufWaitList == NULL);
+
+	RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist, p, next, clean_pss, raidPtr);
+}
+
+static void 
+RealPrintPSStatusTable(raidPtr, pssTable)
+	RF_Raid_t *raidPtr;
+	RF_PSStatusHeader_t *pssTable;
+{
+	int     i, j, procsWaiting, blocksWaiting, bufsWaiting;
+	RF_ReconParityStripeStatus_t *p;
+	RF_CallbackDesc_t *cb;
+
+	printf("\nParity Stripe Status Table\n");
+	for (i = 0; i < raidPtr->pssTableSize; i++) {
+		for (p = pssTable[i].chain; p; p = p->next) {
+			procsWaiting = blocksWaiting = bufsWaiting = 0;
+			for (cb = p->procWaitList; cb; cb = cb->next)
+				procsWaiting++;
+			for (cb = p->blockWaitList; cb; cb = cb->next)
+				blocksWaiting++;
+			for (cb = p->bufWaitList; cb; cb = cb->next)
+				bufsWaiting++;
+			printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ",
+			    (long) p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting);
+			for (j = 0; j < raidPtr->numCol; j++)
+				printf("%c", (p->issued[j]) ? '1' : '0');
+			if (!p->flags)
+				printf(" flags: (none)");
+			else {
+				if (p->flags & RF_PSS_UNDER_RECON)
+					printf(" under-recon");
+				if (p->flags & RF_PSS_FORCED_ON_WRITE)
+					printf(" forced-w");
+				if (p->flags & RF_PSS_FORCED_ON_READ)
+					printf(" forced-r");
+				if (p->flags & RF_PSS_RECON_BLOCKED)
+					printf(" blocked");
+				if (p->flags & RF_PSS_BUFFERWAIT)
+					printf(" bufwait");
+			}
+			printf("\n");
+		}
+	}
+}
+
+void 
+rf_PrintPSStatusTable(raidPtr, row)
+	RF_Raid_t *raidPtr;
+	RF_RowCol_t row;
+{
+	RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable;
+	RealPrintPSStatusTable(raidPtr, pssTable);
+}