2 * Copyright (c) 1997, 1998, 1999
3 * Nan Yang Computer Services Limited. All rights reserved.
5 * Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
7 * Written by Greg Lehey
9 * This software is distributed under the so-called ``Berkeley
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by Nan Yang Computer
24 * 4. Neither the name of the Company nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * This software is provided ``as is'', and any express or implied
29 * warranties, including, but not limited to, the implied warranties of
30 * merchantability and fitness for a particular purpose are disclaimed.
31 * In no event shall the company or contributors be liable for any
32 * direct, indirect, incidental, special, exemplary, or consequential
33 * damages (including, but not limited to, procurement of substitute
34 * goods or services; loss of use, data, or profits; or business
35 * interruption) however caused and on any theory of liability, whether
36 * in contract, strict liability, or tort (including negligence or
37 * otherwise) arising in any way out of the use of this software, even if
38 * advised of the possibility of such damage.
40 * $Id: vinumrevive.c,v 1.14 2000/12/21 01:55:11 grog Exp grog $
41 * $FreeBSD: src/sys/dev/vinum/vinumrevive.c,v 1.22.2.5 2001/03/13 02:59:43 grog Exp $
42 * $DragonFly: src/sys/dev/raid/vinum/vinumrevive.c,v 1.15 2006/12/22 23:26:24 swildner Exp $
49 * Revive a block of a subdisk. Return an error
50 * indication. EAGAIN means successful copy, but
51 * that more blocks remain to be copied. EINVAL
52 * means that the subdisk isn't associated with a
53 * plex (which means a programming error if we get
54 * here at all; FIXME).
58 revive_block(int sdno
)
66 int size
; /* size of revive block, bytes */
67 daddr_t plexblkno
; /* lblkno in plex */
68 int psd
; /* parity subdisk number */
69 u_int64_t stripe
; /* stripe number */
70 int paritysd
= 0; /* set if this is the parity stripe */
71 struct rangelock
*lock
; /* for locking */
72 daddr_t stripeoffset
; /* offset in stripe */
74 plexblkno
= 0; /* to keep the compiler happy */
77 if (sd
->plexno
< 0) /* no plex? */
79 plex
= &PLEX
[sd
->plexno
]; /* point to plex */
81 vol
= &VOL
[plex
->volno
];
85 if ((sd
->revive_blocksize
== 0) /* no block size */
86 ||(sd
->revive_blocksize
& ((1 << DEV_BSHIFT
) - 1))) /* or invalid block size */
87 sd
->revive_blocksize
= DEFAULT_REVIVE_BLOCKSIZE
;
88 else if (sd
->revive_blocksize
> MAX_REVIVE_BLOCKSIZE
)
89 sd
->revive_blocksize
= MAX_REVIVE_BLOCKSIZE
;
90 size
= min(sd
->revive_blocksize
>> DEV_BSHIFT
, sd
->sectors
- sd
->revived
) << DEV_BSHIFT
;
91 sd
->reviver
= curproc
->p_pid
; /* note who last had a bash at it */
93 /* Now decide where to read from */
94 switch (plex
->organization
) {
96 plexblkno
= sd
->revived
+ sd
->plexoffset
; /* corresponding address in plex */
100 stripeoffset
= sd
->revived
% plex
->stripesize
; /* offset from beginning of stripe */
101 if (stripeoffset
+ (size
>> DEV_BSHIFT
) > plex
->stripesize
)
102 size
= (plex
->stripesize
- stripeoffset
) << DEV_BSHIFT
;
103 plexblkno
= sd
->plexoffset
/* base */
104 + (sd
->revived
- stripeoffset
) * plex
->subdisks
/* offset to beginning of stripe */
105 + stripeoffset
; /* offset from beginning of stripe */
110 stripeoffset
= sd
->revived
% plex
->stripesize
; /* offset from beginning of stripe */
111 plexblkno
= sd
->plexoffset
/* base */
112 + (sd
->revived
- stripeoffset
) * (plex
->subdisks
- 1) /* offset to beginning of stripe */
113 +stripeoffset
; /* offset from beginning of stripe */
114 stripe
= (sd
->revived
/ plex
->stripesize
); /* stripe number */
116 /* Make sure we don't go beyond the end of the band. */
117 size
= min(size
, (plex
->stripesize
- stripeoffset
) << DEV_BSHIFT
);
118 if (plex
->organization
== plex_raid4
)
119 psd
= plex
->subdisks
- 1; /* parity subdisk for this stripe */
121 psd
= plex
->subdisks
- 1 - stripe
% plex
->subdisks
; /* parity subdisk for this stripe */
122 paritysd
= plex
->sdnos
[psd
] == sdno
; /* note if it's the parity subdisk */
125 * Now adjust for the strangenesses
126 * in RAID-4 and RAID-5 striping.
128 if (sd
->plexsdno
> psd
) /* beyond the parity stripe, */
129 plexblkno
-= plex
->stripesize
; /* one stripe less */
131 plexblkno
-= plex
->stripesize
* sd
->plexsdno
; /* go back to the beginning of the band */
134 case plex_disorg
: /* to keep the compiler happy */
138 if (paritysd
) { /* we're reviving a parity block, */
139 bp
= parityrebuild(plex
, sd
->revived
, size
, rebuildparity
, &lock
, NULL
); /* do the grunt work */
140 if (bp
== NULL
) /* no buffer space */
141 return ENOMEM
; /* chicken out */
142 } else { /* data block */
143 bp
= getpbuf(&vinum_conf
.physbufs
); /* Get a buffer */
144 bp
->b_data
= Malloc(size
);
147 * Amount to transfer: block size, unless it
148 * would overlap the end.
151 bp
->b_resid
= bp
->b_bcount
;
152 bp
->b_bio1
.bio_offset
= (off_t
)plexblkno
<< DEV_BSHIFT
; /* start here */
153 if (isstriped(plex
)) /* we need to lock striped plexes */
154 lock
= lockrange(plexblkno
<< DEV_BSHIFT
, bp
, plex
); /* lock it */
155 if (vol
!= NULL
) /* it's part of a volume, */
157 * First, read the data from the volume. We
158 * don't care which plex, that's bre's job.
160 dev
= VINUMDEV(plex
->volno
, 0, 0, VINUM_VOLUME_TYPE
); /* create the device number */
161 else /* it's an unattached plex */
162 dev
= VINUM_PLEX(sd
->plexno
); /* create the device number */
164 bp
->b_cmd
= BUF_CMD_READ
;
165 vinumstart(dev
, &bp
->b_bio1
, 1);
169 if (bp
->b_flags
& B_ERROR
)
172 /* Now write to the subdisk */
174 dev
= VINUM_SD(sdno
); /* create the device number */
175 bp
->b_flags
|= B_ORDERED
; /* and make this an ordered write */
176 bp
->b_cmd
= BUF_CMD_WRITE
;
177 bp
->b_resid
= bp
->b_bcount
;
178 bp
->b_bio1
.bio_offset
= (off_t
)sd
->revived
<< DEV_BSHIFT
; /* write it to here */
179 bp
->b_bio1
.bio_driver_info
= dev
;
180 sdio(&bp
->b_bio1
); /* perform the I/O */
182 if (bp
->b_flags
& B_ERROR
)
185 sd
->revived
+= bp
->b_bcount
>> DEV_BSHIFT
; /* moved this much further down */
186 if (sd
->revived
>= sd
->sectors
) { /* finished */
188 set_sd_state(sdno
, sd_up
, setstate_force
); /* bring the sd up */
189 log(LOG_INFO
, "vinum: %s is %s\n", sd
->name
, sd_state(sd
->state
));
190 save_config(); /* and save the updated configuration */
191 error
= 0; /* we're done */
194 if (lock
) /* we took a lock, */
195 unlockrange(sd
->plexno
, lock
); /* give it back */
196 while (sd
->waitlist
) { /* we have waiting requests */
198 struct request
*rq
= sd
->waitlist
;
201 if (debug
& DEBUG_REVIVECONFLICT
) {
202 dev
= rq
->bio
->bio_driver_info
;
204 "Relaunch revive conflict sd %d: %p\n%s dev %d.%d, offset 0x%llx, length %d\n",
207 (rq
->bio
->bio_buf
->b_cmd
== BUF_CMD_READ
) ? "Read" : "Write",
211 rq
->bio
->bio_buf
->b_bcount
);
214 launch_requests(sd
->waitlist
, 1); /* do them now */
215 sd
->waitlist
= sd
->waitlist
->next
; /* and move on to the next */
219 relpbuf(bp
, &vinum_conf
.physbufs
);
224 * Check or rebuild the parity blocks of a RAID-4
227 * The variables plex->checkblock and
228 * plex->rebuildblock represent the
229 * subdisk-relative address of the stripe we're
230 * looking at, not the plex-relative address. We
231 * store it in the plex and not as a local
232 * variable because this function could be
233 * stopped, and we don't want to repeat the part
234 * we've already done. This is also the reason
235 * why we don't initialize it here except at the
236 * end. It gets initialized with the plex on
239 * Each call to this function processes at most
240 * one stripe. We can't loop in this function,
241 * because we're unstoppable, so we have to be
242 * called repeatedly from userland.
245 parityops(struct vinum_ioctl_msg
*data
)
249 int size
; /* I/O transfer size, bytes */
250 int stripe
; /* stripe number in plex */
251 int psd
; /* parity subdisk number */
252 struct rangelock
*lock
; /* lock on stripe */
253 struct _ioctl_reply
*reply
;
254 off_t pstripe
; /* pointer to our stripe counter */
256 off_t errorloc
; /* offset of parity error */
257 enum parityop op
; /* operation to perform */
259 plexno
= data
->index
;
262 reply
= (struct _ioctl_reply
*) data
;
263 reply
->error
= EAGAIN
; /* expect to repeat this call */
264 plex
= &PLEX
[plexno
];
265 if (!isparity(plex
)) { /* not RAID-4 or RAID-5 */
266 reply
->error
= EINVAL
;
268 } else if (plex
->state
< plex_flaky
) {
270 strcpy(reply
->msg
, "Plex is not completely accessible\n");
273 pstripe
= data
->offset
;
274 stripe
= pstripe
/ plex
->stripesize
; /* stripe number */
275 psd
= plex
->subdisks
- 1 - stripe
% plex
->subdisks
; /* parity subdisk for this stripe */
276 size
= min(DEFAULT_REVIVE_BLOCKSIZE
, /* one block at a time */
277 plex
->stripesize
<< DEV_BSHIFT
);
279 pbp
= parityrebuild(plex
, pstripe
, size
, op
, &lock
, &errorloc
); /* do the grunt work */
280 if (pbp
== NULL
) { /* no buffer space */
281 reply
->error
= ENOMEM
;
282 return; /* chicken out */
285 * Now we have a result in the data buffer of
286 * the parity buffer header, which we have kept.
287 * Decide what to do with it.
289 reply
->msg
[0] = '\0'; /* until shown otherwise */
290 if ((pbp
->b_flags
& B_ERROR
) == 0) { /* no error */
291 if ((op
== rebuildparity
)
292 || (op
== rebuildandcheckparity
)) {
293 pbp
->b_cmd
= BUF_CMD_WRITE
;
294 pbp
->b_resid
= pbp
->b_bcount
;
295 sdio(&pbp
->b_bio1
); /* write the parity block */
298 if (((op
== checkparity
)
299 || (op
== rebuildandcheckparity
))
300 && (errorloc
!= -1)) {
301 if (op
== checkparity
)
304 "Parity incorrect at offset 0x%llx\n",
307 if (reply
->error
== EAGAIN
) { /* still OK, */
308 plex
->checkblock
= pstripe
+ (pbp
->b_bcount
>> DEV_BSHIFT
); /* moved this much further down */
309 if (plex
->checkblock
>= SD
[plex
->sdnos
[0]].sectors
) { /* finished */
310 plex
->checkblock
= 0;
315 if (pbp
->b_flags
& B_ERROR
)
316 reply
->error
= pbp
->b_error
;
318 relpbuf(pbp
, &vinum_conf
.physbufs
);
319 unlockrange(plexno
, lock
);
323 * Rebuild a parity stripe. Return pointer to
324 * parity bp. On return,
326 * 1. The band is locked. The caller must unlock
327 * the band and release the buffer header.
329 * 2. All buffer headers except php have been
330 * released. The caller must release pbp.
332 * 3. For checkparity and rebuildandcheckparity,
333 * the parity is compared with the current
334 * parity block. If it's different, the
335 * offset of the error is returned to
336 * errorloc. The caller can set the value of
337 * the pointer to NULL if this is called for
340 * pstripe is the subdisk-relative base address of
341 * the data to be reconstructed, size is the size
342 * of the transfer in bytes.
345 parityrebuild(struct plex
*plex
,
349 struct rangelock
**lockp
,
354 u_int64_t stripe
; /* stripe number */
355 int *parity_buf
; /* buffer address for current parity block */
356 int *newparity_buf
; /* and for new parity block */
357 int mysize
; /* I/O transfer size for this transfer */
358 int isize
; /* mysize in ints */
360 int psd
; /* parity subdisk number */
361 int newpsd
; /* and "subdisk number" of new parity */
362 struct buf
**bpp
; /* pointers to our bps */
363 struct buf
*pbp
; /* buffer header for parity stripe */
365 int bufcount
; /* number of buffers we need */
367 stripe
= pstripe
/ plex
->stripesize
; /* stripe number */
368 psd
= plex
->subdisks
- 1 - stripe
% plex
->subdisks
; /* parity subdisk for this stripe */
369 parity_buf
= NULL
; /* to keep the compiler happy */
373 * It's possible that the default transfer size
374 * we chose is not a factor of the stripe size.
375 * We *must* limit this operation to a single
376 * stripe, at least for RAID-5 rebuild, since
377 * the parity subdisk changes between stripes,
378 * so in this case we need to perform a short
379 * transfer. Set variable mysize to reflect
382 mysize
= min(size
, (plex
->stripesize
* (stripe
+ 1) - pstripe
) << DEV_BSHIFT
);
383 isize
= mysize
/ (sizeof(int)); /* number of ints in the buffer */
384 bufcount
= plex
->subdisks
+ 1; /* sd buffers plus result buffer */
385 newpsd
= plex
->subdisks
;
386 bpp
= (struct buf
**) Malloc(bufcount
* sizeof(struct buf
*)); /* array of pointers to bps */
388 /* First, build requests for all subdisks */
389 for (sdno
= 0; sdno
< bufcount
; sdno
++) { /* for each subdisk */
390 if ((sdno
!= psd
) || (op
!= rebuildparity
)) {
391 /* Get a buffer header and initialize it. */
392 bpp
[sdno
] = getpbuf(&vinum_conf
.physbufs
); /* Get a buffer */
393 bpp
[sdno
]->b_data
= Malloc(mysize
);
395 parity_buf
= (int *) bpp
[sdno
]->b_data
;
396 if (sdno
== newpsd
) /* the new one? */
397 bpp
[sdno
]->b_bio1
.bio_driver_info
= VINUM_SD(plex
->sdnos
[psd
]); /* write back to the parity SD */
399 bpp
[sdno
]->b_bio1
.bio_driver_info
= VINUM_SD(plex
->sdnos
[sdno
]); /* device number */
400 bpp
[sdno
]->b_cmd
= BUF_CMD_READ
; /* either way, read it */
401 bpp
[sdno
]->b_bcount
= mysize
;
402 bpp
[sdno
]->b_resid
= bpp
[sdno
]->b_bcount
;
403 bpp
[sdno
]->b_bio1
.bio_offset
= (off_t
)pstripe
<< DEV_BSHIFT
; /* transfer from here */
407 /* Initialize result buffer */
409 newparity_buf
= (int *) bpp
[newpsd
]->b_data
;
410 bzero(newparity_buf
, mysize
);
413 * Now lock the stripe with the first non-parity
416 *lockp
= lockrange(pstripe
* plex
->stripesize
* (plex
->subdisks
- 1),
421 * Then issue requests for all subdisks in
422 * parallel. Don't transfer the parity stripe
423 * if we're rebuilding parity, unless we also
426 for (sdno
= 0; sdno
< plex
->subdisks
; sdno
++) { /* for each real subdisk */
427 if ((sdno
!= psd
) || (op
!= rebuildparity
)) {
428 sdio(&bpp
[sdno
]->b_bio1
);
433 * Next, wait for the requests to complete.
434 * We wait in the order in which they were
435 * issued, which isn't necessarily the order in
436 * which they complete, but we don't have a
437 * convenient way of doing the latter, and the
440 for (sdno
= 0; sdno
< plex
->subdisks
; sdno
++) { /* for each subdisk */
441 if ((sdno
!= psd
) || (op
!= rebuildparity
)) {
443 if (bpp
[sdno
]->b_flags
& B_ERROR
) /* can't read, */
444 error
= bpp
[sdno
]->b_error
;
445 else if (sdno
!= psd
) { /* update parity */
446 sbuf
= (int *) bpp
[sdno
]->b_data
;
447 for (i
= 0; i
< isize
; i
++)
448 ((int *) newparity_buf
)[i
] ^= sbuf
[i
]; /* xor in the buffer */
451 if (sdno
!= psd
) { /* release all bps except parity */
452 Free(bpp
[sdno
]->b_data
);
453 relpbuf(bpp
[sdno
], &vinum_conf
.physbufs
); /* give back our resources */
458 * If we're checking, compare the calculated
459 * and the read parity block. If they're
460 * different, return the plex-relative offset;
461 * otherwise return -1.
463 if ((op
== checkparity
)
464 || (op
== rebuildandcheckparity
)) {
465 *errorloc
= -1; /* no error yet */
466 for (i
= 0; i
< isize
; i
++) {
467 if (parity_buf
[i
] != newparity_buf
[i
]) {
468 *errorloc
= (off_t
) (pstripe
<< DEV_BSHIFT
) * (plex
->subdisks
- 1)
473 Free(bpp
[psd
]->b_data
);
474 relpbuf(bpp
[psd
], &vinum_conf
.physbufs
); /* give back our resources */
476 /* release our resources */
479 pbp
->b_flags
|= B_ERROR
;
480 pbp
->b_error
= error
;
486 * Initialize a subdisk by writing zeroes to the
487 * complete address space. If verify is set,
488 * check each transfer for correctness.
490 * Each call to this function writes (and maybe
491 * checks) a single block.
494 initsd(int sdno
, int verify
)
501 int size
; /* size of init block, bytes */
502 daddr_t plexblkno
; /* lblkno in plex */
503 int verified
; /* set when we're happy with what we wrote */
506 plexblkno
= 0; /* to keep the compiler happy */
508 if (sd
->plexno
< 0) /* no plex? */
510 plex
= &PLEX
[sd
->plexno
]; /* point to plex */
511 if (plex
->volno
>= 0)
512 vol
= &VOL
[plex
->volno
];
516 if (sd
->init_blocksize
== 0) {
517 if (plex
->stripesize
!= 0) /* we're striped, don't init more than */
518 sd
->init_blocksize
= min(DEFAULT_REVIVE_BLOCKSIZE
, /* one block at a time */
519 plex
->stripesize
<< DEV_BSHIFT
);
521 sd
->init_blocksize
= DEFAULT_REVIVE_BLOCKSIZE
;
522 } else if (sd
->init_blocksize
> MAX_REVIVE_BLOCKSIZE
)
523 sd
->init_blocksize
= MAX_REVIVE_BLOCKSIZE
;
525 size
= min(sd
->init_blocksize
>> DEV_BSHIFT
, sd
->sectors
- sd
->initialized
) << DEV_BSHIFT
;
527 bp
= getpbuf(&vinum_conf
.physbufs
); /* Get a buffer */
528 bp
->b_data
= Malloc(size
);
531 while (!verified
) { /* until we're happy with it, */
533 bp
->b_resid
= bp
->b_bcount
;
534 bp
->b_bio1
.bio_offset
= (off_t
)sd
->initialized
<< DEV_BSHIFT
; /* write it to here */
535 bp
->b_bio1
.bio_driver_info
= VINUM_SD(sdno
);
536 bzero(bp
->b_data
, bp
->b_bcount
);
537 bp
->b_cmd
= BUF_CMD_WRITE
;
538 sdio(&bp
->b_bio1
); /* perform the I/O */
540 if (bp
->b_flags
& B_ERROR
)
542 if ((error
== 0) && verify
) { /* check that it got there */
544 bp
->b_resid
= bp
->b_bcount
;
545 bp
->b_bio1
.bio_offset
= (off_t
)sd
->initialized
<< DEV_BSHIFT
; /* read from here */
546 bp
->b_bio1
.bio_driver_info
= VINUM_SD(sdno
);
547 bp
->b_cmd
= BUF_CMD_READ
; /* read it back */
551 * XXX Bug fix code. This is hopefully no
552 * longer needed (21 February 2000).
554 if (bp
->b_flags
& B_ERROR
)
556 else if ((*bp
->b_data
!= 0) /* first word spammed */
557 ||(bcmp(bp
->b_data
, &bp
->b_data
[1], bp
->b_bcount
- 1))) { /* or one of the others */
558 kprintf("vinum: init error on %s, offset 0x%llx sectors\n",
560 (long long) sd
->initialized
);
568 relpbuf(bp
, &vinum_conf
.physbufs
);
569 if (error
== 0) { /* did it, */
570 sd
->initialized
+= size
>> DEV_BSHIFT
; /* moved this much further down */
571 if (sd
->initialized
>= sd
->sectors
) { /* finished */
573 set_sd_state(sdno
, sd_initialized
, setstate_force
); /* bring the sd up */
574 log(LOG_INFO
, "vinum: %s is %s\n", sd
->name
, sd_state(sd
->state
));
575 save_config(); /* and save the updated configuration */
576 } else /* more to go, */
577 error
= EAGAIN
; /* ya'll come back, see? */
582 /* Local Variables: */
583 /* fill-column: 50 */