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NetBSD/sys/dev/raidframe/rf_copyback.c

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/* $NetBSD: rf_copyback.c,v 1.55 2021/07/27 03:01:48 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.
*/
/*****************************************************************************
*
* copyback.c -- code to copy reconstructed data back from spare space to
* the replaced disk.
*
* the code operates using callbacks on the I/Os to continue with the
* next unit to be copied back. We do this because a simple loop
* containing blocking I/Os will not work in the simulator.
*
****************************************************************************/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rf_copyback.c,v 1.55 2021/07/27 03:01:48 oster Exp $");
#include <dev/raidframe/raidframevar.h>
#include <sys/time.h>
#include <sys/buf.h>
#include "rf_raid.h"
#include "rf_mcpair.h"
#include "rf_acctrace.h"
#include "rf_etimer.h"
#include "rf_general.h"
#include "rf_utils.h"
#include "rf_copyback.h"
#include "rf_decluster.h"
#include "rf_driver.h"
#include "rf_shutdown.h"
#include "rf_kintf.h"
#define RF_COPYBACK_DATA 0
#define RF_COPYBACK_PARITY 1
int rf_copyback_in_progress;
static void rf_CopybackReadDoneProc(void *, int);
static void rf_CopybackWriteDoneProc(void *, int);
static void rf_CopybackOne(RF_CopybackDesc_t * desc, int typ,
RF_RaidAddr_t addr, RF_RowCol_t testCol,
RF_SectorNum_t testOffs);
static void rf_CopybackComplete(RF_CopybackDesc_t * desc, int status);
int
rf_ConfigureCopyback(RF_ShutdownList_t **listp)
{
rf_copyback_in_progress = 0;
return (0);
}
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/namei.h> /* for pathbuf */
#include <miscfs/specfs/specdev.h> /* for v_rdev */
/* do a complete copyback */
void
rf_CopybackReconstructedData(RF_Raid_t *raidPtr)
{
RF_ComponentLabel_t *c_label;
int found, retcode;
RF_CopybackDesc_t *desc;
RF_RowCol_t fcol;
RF_RaidDisk_t *badDisk;
char *databuf;
struct pathbuf *dev_pb;
struct vnode *vp;
int ac;
fcol = 0;
found = 0;
for (fcol = 0; fcol < raidPtr->numCol; fcol++) {
if (raidPtr->Disks[fcol].status == rf_ds_dist_spared
|| raidPtr->Disks[fcol].status == rf_ds_spared) {
found = 1;
break;
}
}
if (!found) {
printf("raid%d: no disks need copyback\n", raidPtr->raidid);
return;
}
badDisk = &raidPtr->Disks[fcol];
/* This device may have been opened successfully the first time. Close
* it before trying to open it again.. */
if (raidPtr->raid_cinfo[fcol].ci_vp != NULL) {
printf("Closed the open device: %s\n",
raidPtr->Disks[fcol].devname);
vp = raidPtr->raid_cinfo[fcol].ci_vp;
ac = raidPtr->Disks[fcol].auto_configured;
rf_close_component(raidPtr, vp, ac);
raidPtr->raid_cinfo[fcol].ci_vp = NULL;
}
/* note that this disk was *not* auto_configured (any longer) */
raidPtr->Disks[fcol].auto_configured = 0;
printf("About to (re-)open the device: %s\n",
raidPtr->Disks[fcol].devname);
dev_pb = pathbuf_create(raidPtr->Disks[fcol].devname);
if (dev_pb == NULL) {
/* shouldn't happen unless maybe the system is OOMing */
printf("raid%d: copyback: pathbuf_create on device: %s failed: %d!\n",
raidPtr->raidid, raidPtr->Disks[fcol].devname,
ENOMEM);
return;
}
retcode = vn_bdev_openpath(dev_pb, &vp, curlwp);
pathbuf_destroy(dev_pb);
if (retcode) {
printf("raid%d: copyback: open device: %s failed: %d!\n",
raidPtr->raidid, raidPtr->Disks[fcol].devname,
retcode);
/* XXX the component isn't responding properly... must be
* still dead :-( */
return;
} else {
/* Ok, so we can at least do a lookup... How about actually
* getting a vp for it? */
retcode = rf_getdisksize(vp, &raidPtr->Disks[fcol]);
if (retcode) {
return;
}
raidPtr->raid_cinfo[fcol].ci_vp = vp;
raidPtr->raid_cinfo[fcol].ci_dev = vp->v_rdev;
raidPtr->Disks[fcol].dev = vp->v_rdev; /* XXX or the above? */
/* we allow the user to specify that only a fraction of the
* disks should be used this is just for debug: it speeds up
* the parity scan */
raidPtr->Disks[fcol].numBlocks =
raidPtr->Disks[fcol].numBlocks *
rf_sizePercentage / 100;
}
if (retcode) {
printf("raid%d: copyback: target disk failed TUR\n",
raidPtr->raidid);
return;
}
/* get a buffer to hold one SU */
databuf = RF_Malloc(rf_RaidAddressToByte(raidPtr,
raidPtr->Layout.sectorsPerStripeUnit));
/* create a descriptor */
desc = RF_Malloc(sizeof(*desc));
desc->raidPtr = raidPtr;
desc->status = 0;
desc->fcol = fcol;
desc->spCol = badDisk->spareCol;
desc->stripeAddr = 0;
desc->sectPerSU = raidPtr->Layout.sectorsPerStripeUnit;
desc->sectPerStripe = raidPtr->Layout.sectorsPerStripeUnit * raidPtr->Layout.numDataCol;
desc->databuf = databuf;
desc->mcpair = rf_AllocMCPair(raidPtr);
/* quiesce the array, since we don't want to code support for user
* accs here */
rf_SuspendNewRequestsAndWait(raidPtr);
/* adjust state of the array and of the disks */
rf_lock_mutex2(raidPtr->mutex);
raidPtr->Disks[desc->fcol].status = rf_ds_optimal;
raidPtr->status = rf_rs_optimal;
rf_copyback_in_progress = 1; /* debug only */
rf_unlock_mutex2(raidPtr->mutex);
RF_GETTIME(desc->starttime);
rf_ContinueCopyback(desc);
/* Data has been restored. Fix up the component label. */
/* Don't actually need the read here.. */
c_label = raidget_component_label(raidPtr, fcol);
raid_init_component_label(raidPtr, c_label);
c_label->row = 0;
c_label->column = fcol;
rf_component_label_set_partitionsize(c_label,
raidPtr->Disks[fcol].partitionSize);
raidflush_component_label(raidPtr, fcol);
/* XXXjld why is this here? */
rf_update_component_labels(raidPtr, RF_NORMAL_COMPONENT_UPDATE);
}
/*
* invoked via callback after a copyback I/O has completed to
* continue on with the next one
*/
void
rf_ContinueCopyback(RF_CopybackDesc_t *desc)
{
RF_SectorNum_t testOffs, stripeAddr;
RF_Raid_t *raidPtr = desc->raidPtr;
RF_RaidAddr_t addr;
RF_RowCol_t testCol;
#if RF_DEBUG_RECON
int old_pctg, new_pctg;
struct timeval t, diff;
#endif
int done;
#if RF_DEBUG_RECON
old_pctg = (-1);
#endif
while (1) {
stripeAddr = desc->stripeAddr;
desc->raidPtr->copyback_stripes_done = stripeAddr
/ desc->sectPerStripe;
#if RF_DEBUG_RECON
if (rf_prReconSched) {
old_pctg = 100 * desc->stripeAddr / raidPtr->totalSectors;
}
#endif
desc->stripeAddr += desc->sectPerStripe;
#if RF_DEBUG_RECON
if (rf_prReconSched) {
new_pctg = 100 * desc->stripeAddr / raidPtr->totalSectors;
if (new_pctg != old_pctg) {
RF_GETTIME(t);
RF_TIMEVAL_DIFF(&desc->starttime, &t, &diff);
printf("%d %d.%06d\n", new_pctg, (int) diff.tv_sec, (int) diff.tv_usec);
}
}
#endif
if (stripeAddr >= raidPtr->totalSectors) {
rf_CopybackComplete(desc, 0);
return;
}
/* walk through the current stripe, su-by-su */
for (done = 0, addr = stripeAddr; addr < stripeAddr + desc->sectPerStripe; addr += desc->sectPerSU) {
/* map the SU, disallowing remap to spare space */
(raidPtr->Layout.map->MapSector) (raidPtr, addr, &testCol, &testOffs, RF_DONT_REMAP);
if (testCol == desc->fcol) {
rf_CopybackOne(desc, RF_COPYBACK_DATA, addr, testCol, testOffs);
done = 1;
break;
}
}
if (!done) {
/* we didn't find the failed disk in the data part.
* check parity. */
/* map the parity for this stripe, disallowing remap
* to spare space */
(raidPtr->Layout.map->MapParity) (raidPtr, stripeAddr, &testCol, &testOffs, RF_DONT_REMAP);
if (testCol == desc->fcol) {
rf_CopybackOne(desc, RF_COPYBACK_PARITY, stripeAddr, testCol, testOffs);
}
}
/* check to see if the last read/write pair failed */
if (desc->status) {
rf_CopybackComplete(desc, 1);
return;
}
/* we didn't find any units to copy back in this stripe.
* Continue with the next one */
}
}
/* copyback one unit */
static void
rf_CopybackOne(RF_CopybackDesc_t *desc, int typ, RF_RaidAddr_t addr,
RF_RowCol_t testCol, RF_SectorNum_t testOffs)
{
RF_SectorCount_t sectPerSU = desc->sectPerSU;
RF_Raid_t *raidPtr = desc->raidPtr;
RF_RowCol_t spCol = desc->spCol;
RF_SectorNum_t spOffs;
/* find the spare spare location for this SU */
if (raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE) {
if (typ == RF_COPYBACK_DATA)
raidPtr->Layout.map->MapSector(raidPtr, addr, &spCol, &spOffs, RF_REMAP);
else
raidPtr->Layout.map->MapParity(raidPtr, addr, &spCol, &spOffs, RF_REMAP);
} else {
spOffs = testOffs;
}
/* create reqs to read the old location & write the new */
desc->readreq = rf_CreateDiskQueueData(RF_IO_TYPE_READ, spOffs,
sectPerSU, desc->databuf, 0L, 0, rf_CopybackReadDoneProc, desc,
NULL, (void *) raidPtr, RF_DISKQUEUE_DATA_FLAGS_NONE, NULL);
desc->writereq = rf_CreateDiskQueueData(RF_IO_TYPE_WRITE, testOffs,
sectPerSU, desc->databuf, 0L, 0, rf_CopybackWriteDoneProc, desc,
NULL, (void *) raidPtr, RF_DISKQUEUE_DATA_FLAGS_NONE, NULL);
desc->fcol = testCol;
/* enqueue the read. the write will go out as part of the callback on
* the read. at user-level & in the kernel, wait for the read-write
* pair to complete. in the simulator, just return, since everything
* will happen as callbacks */
RF_LOCK_MCPAIR(desc->mcpair);
desc->mcpair->flag = 0;
RF_UNLOCK_MCPAIR(desc->mcpair);
rf_DiskIOEnqueue(&raidPtr->Queues[spCol], desc->readreq, RF_IO_NORMAL_PRIORITY);
RF_LOCK_MCPAIR(desc->mcpair);
while (!desc->mcpair->flag) {
RF_WAIT_MCPAIR(desc->mcpair);
}
RF_UNLOCK_MCPAIR(desc->mcpair);
rf_FreeDiskQueueData(desc->readreq);
rf_FreeDiskQueueData(desc->writereq);
}
/* called at interrupt context when the read has completed. just send out the write */
static void
rf_CopybackReadDoneProc(void *v, int status)
{
RF_CopybackDesc_t *desc = v;
if (status) { /* invoke the callback with bad status */
printf("raid%d: copyback read failed. Aborting.\n",
desc->raidPtr->raidid);
(desc->writereq->CompleteFunc) (desc, -100);
} else {
rf_DiskIOEnqueue(&(desc->raidPtr->Queues[desc->fcol]), desc->writereq, RF_IO_NORMAL_PRIORITY);
}
}
/* called at interrupt context when the write has completed.
* at user level & in the kernel, wake up the copyback thread.
* in the simulator, invoke the next copyback directly.
* can't free diskqueuedata structs in the kernel b/c we're at interrupt context.
*/
static void
rf_CopybackWriteDoneProc(void *v, int status)
{
RF_CopybackDesc_t *desc = v;
if (status && status != -100) {
printf("raid%d: copyback write failed. Aborting.\n",
desc->raidPtr->raidid);
}
desc->status = status;
rf_MCPairWakeupFunc(desc->mcpair);
}
/* invoked when the copyback has completed */
static void
rf_CopybackComplete(RF_CopybackDesc_t *desc, int status)
{
RF_Raid_t *raidPtr = desc->raidPtr;
struct timeval t, diff;
if (!status) {
rf_lock_mutex2(raidPtr->mutex);
if (raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE) {
RF_ASSERT(raidPtr->Layout.map->parityConfig == 'D');
rf_FreeSpareTable(raidPtr);
} else {
raidPtr->Disks[desc->spCol].status = rf_ds_spare;
}
rf_unlock_mutex2(raidPtr->mutex);
RF_GETTIME(t);
RF_TIMEVAL_DIFF(&desc->starttime, &t, &diff);
#if 0
printf("Copyback time was %d.%06d seconds\n",
(int) diff.tv_sec, (int) diff.tv_usec);
#endif
} else
printf("raid%d: Copyback failure. Status: %d\n",
raidPtr->raidid, status);
RF_Free(desc->databuf, rf_RaidAddressToByte(raidPtr, desc->sectPerSU));
rf_FreeMCPair(raidPtr, desc->mcpair);
RF_Free(desc, sizeof(*desc));
rf_copyback_in_progress = 0;
rf_ResumeNewRequests(raidPtr);
}
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