1 | /* $NetBSD: rf_copyback.c,v 1.50 2014/06/14 07:39:00 hannken 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 | * copyback.c -- code to copy reconstructed data back from spare space to |
32 | * the replaced disk. |
33 | * |
34 | * the code operates using callbacks on the I/Os to continue with the |
35 | * next unit to be copied back. We do this because a simple loop |
36 | * containing blocking I/Os will not work in the simulator. |
37 | * |
38 | ****************************************************************************/ |
39 | |
40 | #include <sys/cdefs.h> |
41 | __KERNEL_RCSID(0, "$NetBSD: rf_copyback.c,v 1.50 2014/06/14 07:39:00 hannken Exp $" ); |
42 | |
43 | #include <dev/raidframe/raidframevar.h> |
44 | |
45 | #include <sys/time.h> |
46 | #include <sys/buf.h> |
47 | #include "rf_raid.h" |
48 | #include "rf_mcpair.h" |
49 | #include "rf_acctrace.h" |
50 | #include "rf_etimer.h" |
51 | #include "rf_general.h" |
52 | #include "rf_utils.h" |
53 | #include "rf_copyback.h" |
54 | #include "rf_decluster.h" |
55 | #include "rf_driver.h" |
56 | #include "rf_shutdown.h" |
57 | #include "rf_kintf.h" |
58 | |
59 | #define RF_COPYBACK_DATA 0 |
60 | #define RF_COPYBACK_PARITY 1 |
61 | |
62 | int rf_copyback_in_progress; |
63 | |
64 | static int rf_CopybackReadDoneProc(RF_CopybackDesc_t * desc, int status); |
65 | static int rf_CopybackWriteDoneProc(RF_CopybackDesc_t * desc, int status); |
66 | static void rf_CopybackOne(RF_CopybackDesc_t * desc, int typ, |
67 | RF_RaidAddr_t addr, RF_RowCol_t testCol, |
68 | RF_SectorNum_t testOffs); |
69 | static void rf_CopybackComplete(RF_CopybackDesc_t * desc, int status); |
70 | |
71 | int |
72 | rf_ConfigureCopyback(RF_ShutdownList_t **listp) |
73 | { |
74 | rf_copyback_in_progress = 0; |
75 | return (0); |
76 | } |
77 | |
78 | #include <sys/param.h> |
79 | #include <sys/systm.h> |
80 | #include <sys/proc.h> |
81 | #include <sys/ioctl.h> |
82 | #include <sys/fcntl.h> |
83 | #include <sys/vnode.h> |
84 | #include <sys/namei.h> /* for pathbuf */ |
85 | |
86 | #include <miscfs/specfs/specdev.h> /* for v_rdev */ |
87 | |
88 | /* do a complete copyback */ |
89 | void |
90 | rf_CopybackReconstructedData(RF_Raid_t *raidPtr) |
91 | { |
92 | RF_ComponentLabel_t *c_label; |
93 | int found, retcode; |
94 | RF_CopybackDesc_t *desc; |
95 | RF_RowCol_t fcol; |
96 | RF_RaidDisk_t *badDisk; |
97 | char *databuf; |
98 | |
99 | struct pathbuf *dev_pb; |
100 | struct vnode *vp; |
101 | |
102 | int ac; |
103 | |
104 | fcol = 0; |
105 | found = 0; |
106 | for (fcol = 0; fcol < raidPtr->numCol; fcol++) { |
107 | if (raidPtr->Disks[fcol].status == rf_ds_dist_spared |
108 | || raidPtr->Disks[fcol].status == rf_ds_spared) { |
109 | found = 1; |
110 | break; |
111 | } |
112 | } |
113 | |
114 | if (!found) { |
115 | printf("raid%d: no disks need copyback\n" , raidPtr->raidid); |
116 | return; |
117 | } |
118 | |
119 | badDisk = &raidPtr->Disks[fcol]; |
120 | |
121 | /* This device may have been opened successfully the first time. Close |
122 | * it before trying to open it again.. */ |
123 | |
124 | if (raidPtr->raid_cinfo[fcol].ci_vp != NULL) { |
125 | printf("Closed the open device: %s\n" , |
126 | raidPtr->Disks[fcol].devname); |
127 | vp = raidPtr->raid_cinfo[fcol].ci_vp; |
128 | ac = raidPtr->Disks[fcol].auto_configured; |
129 | rf_close_component(raidPtr, vp, ac); |
130 | raidPtr->raid_cinfo[fcol].ci_vp = NULL; |
131 | |
132 | } |
133 | /* note that this disk was *not* auto_configured (any longer) */ |
134 | raidPtr->Disks[fcol].auto_configured = 0; |
135 | |
136 | printf("About to (re-)open the device: %s\n" , |
137 | raidPtr->Disks[fcol].devname); |
138 | |
139 | dev_pb = pathbuf_create(raidPtr->Disks[fcol].devname); |
140 | if (dev_pb == NULL) { |
141 | /* shouldn't happen unless maybe the system is OOMing */ |
142 | printf("raid%d: copyback: pathbuf_create on device: %s failed: %d!\n" , |
143 | raidPtr->raidid, raidPtr->Disks[fcol].devname, |
144 | ENOMEM); |
145 | return; |
146 | } |
147 | retcode = dk_lookup(dev_pb, curlwp, &vp); |
148 | pathbuf_destroy(dev_pb); |
149 | |
150 | if (retcode) { |
151 | printf("raid%d: copyback: dk_lookup on device: %s failed: %d!\n" , |
152 | raidPtr->raidid, raidPtr->Disks[fcol].devname, |
153 | retcode); |
154 | |
155 | /* XXX the component isn't responding properly... must be |
156 | * still dead :-( */ |
157 | return; |
158 | |
159 | } else { |
160 | |
161 | /* Ok, so we can at least do a lookup... How about actually |
162 | * getting a vp for it? */ |
163 | |
164 | retcode = rf_getdisksize(vp, &raidPtr->Disks[fcol]); |
165 | if (retcode) { |
166 | return; |
167 | } |
168 | |
169 | raidPtr->raid_cinfo[fcol].ci_vp = vp; |
170 | raidPtr->raid_cinfo[fcol].ci_dev = vp->v_rdev; |
171 | |
172 | raidPtr->Disks[fcol].dev = vp->v_rdev; /* XXX or the above? */ |
173 | |
174 | /* we allow the user to specify that only a fraction of the |
175 | * disks should be used this is just for debug: it speeds up |
176 | * the parity scan */ |
177 | raidPtr->Disks[fcol].numBlocks = |
178 | raidPtr->Disks[fcol].numBlocks * |
179 | rf_sizePercentage / 100; |
180 | } |
181 | |
182 | if (retcode) { |
183 | printf("raid%d: copyback: target disk failed TUR\n" , |
184 | raidPtr->raidid); |
185 | return; |
186 | } |
187 | /* get a buffer to hold one SU */ |
188 | RF_Malloc(databuf, rf_RaidAddressToByte(raidPtr, raidPtr->Layout.sectorsPerStripeUnit), (char *)); |
189 | |
190 | /* create a descriptor */ |
191 | RF_Malloc(desc, sizeof(*desc), (RF_CopybackDesc_t *)); |
192 | desc->raidPtr = raidPtr; |
193 | desc->status = 0; |
194 | desc->fcol = fcol; |
195 | desc->spCol = badDisk->spareCol; |
196 | desc->stripeAddr = 0; |
197 | desc->sectPerSU = raidPtr->Layout.sectorsPerStripeUnit; |
198 | desc->sectPerStripe = raidPtr->Layout.sectorsPerStripeUnit * raidPtr->Layout.numDataCol; |
199 | desc->databuf = databuf; |
200 | desc->mcpair = rf_AllocMCPair(); |
201 | |
202 | /* quiesce the array, since we don't want to code support for user |
203 | * accs here */ |
204 | rf_SuspendNewRequestsAndWait(raidPtr); |
205 | |
206 | /* adjust state of the array and of the disks */ |
207 | rf_lock_mutex2(raidPtr->mutex); |
208 | raidPtr->Disks[desc->fcol].status = rf_ds_optimal; |
209 | raidPtr->status = rf_rs_optimal; |
210 | rf_copyback_in_progress = 1; /* debug only */ |
211 | rf_unlock_mutex2(raidPtr->mutex); |
212 | |
213 | RF_GETTIME(desc->starttime); |
214 | rf_ContinueCopyback(desc); |
215 | |
216 | /* Data has been restored. Fix up the component label. */ |
217 | /* Don't actually need the read here.. */ |
218 | |
219 | c_label = raidget_component_label(raidPtr, fcol); |
220 | raid_init_component_label(raidPtr, c_label); |
221 | |
222 | c_label->row = 0; |
223 | c_label->column = fcol; |
224 | rf_component_label_set_partitionsize(c_label, |
225 | raidPtr->Disks[fcol].partitionSize); |
226 | |
227 | raidflush_component_label(raidPtr, fcol); |
228 | |
229 | /* XXXjld why is this here? */ |
230 | rf_update_component_labels(raidPtr, RF_NORMAL_COMPONENT_UPDATE); |
231 | } |
232 | |
233 | |
234 | /* |
235 | * invoked via callback after a copyback I/O has completed to |
236 | * continue on with the next one |
237 | */ |
238 | void |
239 | rf_ContinueCopyback(RF_CopybackDesc_t *desc) |
240 | { |
241 | RF_SectorNum_t testOffs, stripeAddr; |
242 | RF_Raid_t *raidPtr = desc->raidPtr; |
243 | RF_RaidAddr_t addr; |
244 | RF_RowCol_t testCol; |
245 | #if RF_DEBUG_RECON |
246 | int old_pctg, new_pctg; |
247 | struct timeval t, diff; |
248 | #endif |
249 | int done; |
250 | |
251 | #if RF_DEBUG_RECON |
252 | old_pctg = (-1); |
253 | #endif |
254 | while (1) { |
255 | stripeAddr = desc->stripeAddr; |
256 | desc->raidPtr->copyback_stripes_done = stripeAddr |
257 | / desc->sectPerStripe; |
258 | #if RF_DEBUG_RECON |
259 | if (rf_prReconSched) { |
260 | old_pctg = 100 * desc->stripeAddr / raidPtr->totalSectors; |
261 | } |
262 | #endif |
263 | desc->stripeAddr += desc->sectPerStripe; |
264 | #if RF_DEBUG_RECON |
265 | if (rf_prReconSched) { |
266 | new_pctg = 100 * desc->stripeAddr / raidPtr->totalSectors; |
267 | if (new_pctg != old_pctg) { |
268 | RF_GETTIME(t); |
269 | RF_TIMEVAL_DIFF(&desc->starttime, &t, &diff); |
270 | printf("%d %d.%06d\n" , new_pctg, (int) diff.tv_sec, (int) diff.tv_usec); |
271 | } |
272 | } |
273 | #endif |
274 | if (stripeAddr >= raidPtr->totalSectors) { |
275 | rf_CopybackComplete(desc, 0); |
276 | return; |
277 | } |
278 | /* walk through the current stripe, su-by-su */ |
279 | for (done = 0, addr = stripeAddr; addr < stripeAddr + desc->sectPerStripe; addr += desc->sectPerSU) { |
280 | |
281 | /* map the SU, disallowing remap to spare space */ |
282 | (raidPtr->Layout.map->MapSector) (raidPtr, addr, &testCol, &testOffs, RF_DONT_REMAP); |
283 | |
284 | if (testCol == desc->fcol) { |
285 | rf_CopybackOne(desc, RF_COPYBACK_DATA, addr, testCol, testOffs); |
286 | done = 1; |
287 | break; |
288 | } |
289 | } |
290 | |
291 | if (!done) { |
292 | /* we didn't find the failed disk in the data part. |
293 | * check parity. */ |
294 | |
295 | /* map the parity for this stripe, disallowing remap |
296 | * to spare space */ |
297 | (raidPtr->Layout.map->MapParity) (raidPtr, stripeAddr, &testCol, &testOffs, RF_DONT_REMAP); |
298 | |
299 | if (testCol == desc->fcol) { |
300 | rf_CopybackOne(desc, RF_COPYBACK_PARITY, stripeAddr, testCol, testOffs); |
301 | } |
302 | } |
303 | /* check to see if the last read/write pair failed */ |
304 | if (desc->status) { |
305 | rf_CopybackComplete(desc, 1); |
306 | return; |
307 | } |
308 | /* we didn't find any units to copy back in this stripe. |
309 | * Continue with the next one */ |
310 | } |
311 | } |
312 | |
313 | |
314 | /* copyback one unit */ |
315 | static void |
316 | rf_CopybackOne(RF_CopybackDesc_t *desc, int typ, RF_RaidAddr_t addr, |
317 | RF_RowCol_t testCol, RF_SectorNum_t testOffs) |
318 | { |
319 | RF_SectorCount_t sectPerSU = desc->sectPerSU; |
320 | RF_Raid_t *raidPtr = desc->raidPtr; |
321 | RF_RowCol_t spCol = desc->spCol; |
322 | RF_SectorNum_t spOffs; |
323 | |
324 | /* find the spare spare location for this SU */ |
325 | if (raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE) { |
326 | if (typ == RF_COPYBACK_DATA) |
327 | raidPtr->Layout.map->MapSector(raidPtr, addr, &spCol, &spOffs, RF_REMAP); |
328 | else |
329 | raidPtr->Layout.map->MapParity(raidPtr, addr, &spCol, &spOffs, RF_REMAP); |
330 | } else { |
331 | spOffs = testOffs; |
332 | } |
333 | |
334 | /* create reqs to read the old location & write the new */ |
335 | desc->readreq = rf_CreateDiskQueueData(RF_IO_TYPE_READ, spOffs, |
336 | sectPerSU, desc->databuf, 0L, 0, |
337 | (int (*) (void *, int)) rf_CopybackReadDoneProc, desc, |
338 | NULL, (void *) raidPtr, RF_DISKQUEUE_DATA_FLAGS_NONE, NULL, |
339 | PR_WAITOK); |
340 | desc->writereq = rf_CreateDiskQueueData(RF_IO_TYPE_WRITE, testOffs, |
341 | sectPerSU, desc->databuf, 0L, 0, |
342 | (int (*) (void *, int)) rf_CopybackWriteDoneProc, desc, |
343 | NULL, (void *) raidPtr, RF_DISKQUEUE_DATA_FLAGS_NONE, NULL, |
344 | PR_WAITOK); |
345 | desc->fcol = testCol; |
346 | |
347 | /* enqueue the read. the write will go out as part of the callback on |
348 | * the read. at user-level & in the kernel, wait for the read-write |
349 | * pair to complete. in the simulator, just return, since everything |
350 | * will happen as callbacks */ |
351 | |
352 | RF_LOCK_MCPAIR(desc->mcpair); |
353 | desc->mcpair->flag = 0; |
354 | RF_UNLOCK_MCPAIR(desc->mcpair); |
355 | |
356 | rf_DiskIOEnqueue(&raidPtr->Queues[spCol], desc->readreq, RF_IO_NORMAL_PRIORITY); |
357 | |
358 | RF_LOCK_MCPAIR(desc->mcpair); |
359 | while (!desc->mcpair->flag) { |
360 | RF_WAIT_MCPAIR(desc->mcpair); |
361 | } |
362 | RF_UNLOCK_MCPAIR(desc->mcpair); |
363 | rf_FreeDiskQueueData(desc->readreq); |
364 | rf_FreeDiskQueueData(desc->writereq); |
365 | |
366 | } |
367 | |
368 | |
369 | /* called at interrupt context when the read has completed. just send out the write */ |
370 | static int |
371 | rf_CopybackReadDoneProc(RF_CopybackDesc_t *desc, int status) |
372 | { |
373 | if (status) { /* invoke the callback with bad status */ |
374 | printf("raid%d: copyback read failed. Aborting.\n" , |
375 | desc->raidPtr->raidid); |
376 | (desc->writereq->CompleteFunc) (desc, -100); |
377 | } else { |
378 | rf_DiskIOEnqueue(&(desc->raidPtr->Queues[desc->fcol]), desc->writereq, RF_IO_NORMAL_PRIORITY); |
379 | } |
380 | return (0); |
381 | } |
382 | /* called at interrupt context when the write has completed. |
383 | * at user level & in the kernel, wake up the copyback thread. |
384 | * in the simulator, invoke the next copyback directly. |
385 | * can't free diskqueuedata structs in the kernel b/c we're at interrupt context. |
386 | */ |
387 | static int |
388 | rf_CopybackWriteDoneProc(RF_CopybackDesc_t *desc, int status) |
389 | { |
390 | if (status && status != -100) { |
391 | printf("raid%d: copyback write failed. Aborting.\n" , |
392 | desc->raidPtr->raidid); |
393 | } |
394 | desc->status = status; |
395 | rf_MCPairWakeupFunc(desc->mcpair); |
396 | return (0); |
397 | } |
398 | /* invoked when the copyback has completed */ |
399 | static void |
400 | rf_CopybackComplete(RF_CopybackDesc_t *desc, int status) |
401 | { |
402 | RF_Raid_t *raidPtr = desc->raidPtr; |
403 | struct timeval t, diff; |
404 | |
405 | if (!status) { |
406 | rf_lock_mutex2(raidPtr->mutex); |
407 | if (raidPtr->Layout.map->flags & RF_DISTRIBUTE_SPARE) { |
408 | RF_ASSERT(raidPtr->Layout.map->parityConfig == 'D'); |
409 | rf_FreeSpareTable(raidPtr); |
410 | } else { |
411 | raidPtr->Disks[desc->spCol].status = rf_ds_spare; |
412 | } |
413 | rf_unlock_mutex2(raidPtr->mutex); |
414 | |
415 | RF_GETTIME(t); |
416 | RF_TIMEVAL_DIFF(&desc->starttime, &t, &diff); |
417 | #if 0 |
418 | printf("Copyback time was %d.%06d seconds\n" , |
419 | (int) diff.tv_sec, (int) diff.tv_usec); |
420 | #endif |
421 | } else |
422 | printf("raid%d: Copyback failure. Status: %d\n" , |
423 | raidPtr->raidid, status); |
424 | |
425 | RF_Free(desc->databuf, rf_RaidAddressToByte(raidPtr, desc->sectPerSU)); |
426 | rf_FreeMCPair(desc->mcpair); |
427 | RF_Free(desc, sizeof(*desc)); |
428 | |
429 | rf_copyback_in_progress = 0; |
430 | rf_ResumeNewRequests(raidPtr); |
431 | } |
432 | |