2 * NFTL mount code with extensive checks
4 * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
5 * Copyright (C) 2000 Netgem S.A.
7 * $Id: nftlmount.c,v 1.36 2004/06/28 13:52:55 dbrown Exp $
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/kernel.h>
25 #include <asm/errno.h>
26 #include <linux/delay.h>
27 #include <linux/slab.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/mtd/nand.h>
30 #include <linux/mtd/nftl.h>
32 #define SECTORSIZE 512
34 char nftlmountrev
[]="$Revision: 1.36 $";
36 /* find_boot_record: Find the NFTL Media Header and its Spare copy which contains the
37 * various device information of the NFTL partition and Bad Unit Table. Update
38 * the ReplUnitTable[] table accroding to the Bad Unit Table. ReplUnitTable[]
39 * is used for management of Erase Unit in other routines in nftl.c and nftlmount.c
41 static int find_boot_record(struct NFTLrecord
*nftl
)
45 unsigned int block
, boot_record_count
= 0;
48 struct NFTLMediaHeader
*mh
= &nftl
->MediaHdr
;
51 /* Assume logical EraseSize == physical erasesize for starting the scan.
52 We'll sort it out later if we find a MediaHeader which says otherwise */
53 /* Actually, we won't. The new DiskOnChip driver has already scanned
54 the MediaHeader and adjusted the virtual erasesize it presents in
55 the mtd device accordingly. We could even get rid of
56 nftl->EraseSize if there were any point in doing so. */
57 nftl
->EraseSize
= nftl
->mbd
.mtd
->erasesize
;
58 nftl
->nb_blocks
= nftl
->mbd
.mtd
->size
/ nftl
->EraseSize
;
60 nftl
->MediaUnit
= BLOCK_NIL
;
61 nftl
->SpareMediaUnit
= BLOCK_NIL
;
63 /* search for a valid boot record */
64 for (block
= 0; block
< nftl
->nb_blocks
; block
++) {
67 /* Check for ANAND header first. Then can whinge if it's found but later
69 ret
= MTD_READ(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
, SECTORSIZE
, &retlen
, buf
);
70 /* We ignore ret in case the ECC of the MediaHeader is invalid
71 (which is apparently acceptable) */
72 if (retlen
!= SECTORSIZE
) {
73 static int warncount
= 5;
76 printk(KERN_WARNING
"Block read at 0x%x of mtd%d failed: %d\n",
77 block
* nftl
->EraseSize
, nftl
->mbd
.mtd
->index
, ret
);
79 printk(KERN_WARNING
"Further failures for this block will not be printed\n");
84 if (retlen
< 6 || memcmp(buf
, "ANAND", 6)) {
85 /* ANAND\0 not found. Continue */
87 printk(KERN_DEBUG
"ANAND header not found at 0x%x in mtd%d\n",
88 block
* nftl
->EraseSize
, nftl
->mbd
.mtd
->index
);
93 /* To be safer with BIOS, also use erase mark as discriminant */
94 if ((ret
= MTD_READOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ SECTORSIZE
+ 8,
95 8, &retlen
, (char *)&h1
) < 0)) {
96 printk(KERN_WARNING
"ANAND header found at 0x%x in mtd%d, but OOB data read failed (err %d)\n",
97 block
* nftl
->EraseSize
, nftl
->mbd
.mtd
->index
, ret
);
101 #if 0 /* Some people seem to have devices without ECC or erase marks
102 on the Media Header blocks. There are enough other sanity
103 checks in here that we can probably do without it.
105 if (le16_to_cpu(h1
.EraseMark
| h1
.EraseMark1
) != ERASE_MARK
) {
106 printk(KERN_NOTICE
"ANAND header found at 0x%x in mtd%d, but erase mark not present (0x%04x,0x%04x instead)\n",
107 block
* nftl
->EraseSize
, nftl
->mbd
.mtd
->index
,
108 le16_to_cpu(h1
.EraseMark
), le16_to_cpu(h1
.EraseMark1
));
112 /* Finally reread to check ECC */
113 if ((ret
= MTD_READECC(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
, SECTORSIZE
,
114 &retlen
, buf
, (char *)&oob
, NULL
) < 0)) {
115 printk(KERN_NOTICE
"ANAND header found at 0x%x in mtd%d, but ECC read failed (err %d)\n",
116 block
* nftl
->EraseSize
, nftl
->mbd
.mtd
->index
, ret
);
120 /* Paranoia. Check the ANAND header is still there after the ECC read */
121 if (memcmp(buf
, "ANAND", 6)) {
122 printk(KERN_NOTICE
"ANAND header found at 0x%x in mtd%d, but went away on reread!\n",
123 block
* nftl
->EraseSize
, nftl
->mbd
.mtd
->index
);
124 printk(KERN_NOTICE
"New data are: %02x %02x %02x %02x %02x %02x\n",
125 buf
[0], buf
[1], buf
[2], buf
[3], buf
[4], buf
[5]);
129 /* OK, we like it. */
131 if (boot_record_count
) {
132 /* We've already processed one. So we just check if
133 this one is the same as the first one we found */
134 if (memcmp(mh
, buf
, sizeof(struct NFTLMediaHeader
))) {
135 printk(KERN_NOTICE
"NFTL Media Headers at 0x%x and 0x%x disagree.\n",
136 nftl
->MediaUnit
* nftl
->EraseSize
, block
* nftl
->EraseSize
);
137 /* if (debug) Print both side by side */
138 if (boot_record_count
< 2) {
139 /* We haven't yet seen two real ones */
144 if (boot_record_count
== 1)
145 nftl
->SpareMediaUnit
= block
;
147 /* Mark this boot record (NFTL MediaHeader) block as reserved */
148 nftl
->ReplUnitTable
[block
] = BLOCK_RESERVED
;
155 /* This is the first we've seen. Copy the media header structure into place */
156 memcpy(mh
, buf
, sizeof(struct NFTLMediaHeader
));
158 /* Do some sanity checks on it */
160 The
new DiskOnChip driver scans the MediaHeader itself
, and presents a
virtual
161 erasesize based on UnitSizeFactor
. So the erasesize we read from the mtd
162 device is already correct
.
163 if (mh
->UnitSizeFactor
== 0) {
164 printk(KERN_NOTICE
"NFTL: UnitSizeFactor 0x00 detected. This violates the spec but we think we know what it means...\n");
165 } else if (mh
->UnitSizeFactor
< 0xfc) {
166 printk(KERN_NOTICE
"Sorry, we don't support UnitSizeFactor 0x%02x\n",
169 } else if (mh
->UnitSizeFactor
!= 0xff) {
170 printk(KERN_NOTICE
"WARNING: Support for NFTL with UnitSizeFactor 0x%02x is experimental\n",
172 nftl
->EraseSize
= nftl
->mbd
.mtd
->erasesize
<< (0xff - mh
->UnitSizeFactor
);
173 nftl
->nb_blocks
= nftl
->mbd
.mtd
->size
/ nftl
->EraseSize
;
176 nftl
->nb_boot_blocks
= le16_to_cpu(mh
->FirstPhysicalEUN
);
177 if ((nftl
->nb_boot_blocks
+ 2) >= nftl
->nb_blocks
) {
178 printk(KERN_NOTICE
"NFTL Media Header sanity check failed:\n");
179 printk(KERN_NOTICE
"nb_boot_blocks (%d) + 2 > nb_blocks (%d)\n",
180 nftl
->nb_boot_blocks
, nftl
->nb_blocks
);
184 nftl
->numvunits
= le32_to_cpu(mh
->FormattedSize
) / nftl
->EraseSize
;
185 if (nftl
->numvunits
> (nftl
->nb_blocks
- nftl
->nb_boot_blocks
- 2)) {
186 printk(KERN_NOTICE
"NFTL Media Header sanity check failed:\n");
187 printk(KERN_NOTICE
"numvunits (%d) > nb_blocks (%d) - nb_boot_blocks(%d) - 2\n",
188 nftl
->numvunits
, nftl
->nb_blocks
, nftl
->nb_boot_blocks
);
192 nftl
->mbd
.size
= nftl
->numvunits
* (nftl
->EraseSize
/ SECTORSIZE
);
194 /* If we're not using the last sectors in the device for some reason,
195 reduce nb_blocks accordingly so we forget they're there */
196 nftl
->nb_blocks
= le16_to_cpu(mh
->NumEraseUnits
) + le16_to_cpu(mh
->FirstPhysicalEUN
);
198 /* XXX: will be suppressed */
199 nftl
->lastEUN
= nftl
->nb_blocks
- 1;
202 nftl
->EUNtable
= kmalloc(nftl
->nb_blocks
* sizeof(u16
), GFP_KERNEL
);
203 if (!nftl
->EUNtable
) {
204 printk(KERN_NOTICE
"NFTL: allocation of EUNtable failed\n");
208 nftl
->ReplUnitTable
= kmalloc(nftl
->nb_blocks
* sizeof(u16
), GFP_KERNEL
);
209 if (!nftl
->ReplUnitTable
) {
210 kfree(nftl
->EUNtable
);
211 printk(KERN_NOTICE
"NFTL: allocation of ReplUnitTable failed\n");
215 /* mark the bios blocks (blocks before NFTL MediaHeader) as reserved */
216 for (i
= 0; i
< nftl
->nb_boot_blocks
; i
++)
217 nftl
->ReplUnitTable
[i
] = BLOCK_RESERVED
;
218 /* mark all remaining blocks as potentially containing data */
219 for (; i
< nftl
->nb_blocks
; i
++) {
220 nftl
->ReplUnitTable
[i
] = BLOCK_NOTEXPLORED
;
223 /* Mark this boot record (NFTL MediaHeader) block as reserved */
224 nftl
->ReplUnitTable
[block
] = BLOCK_RESERVED
;
226 /* read the Bad Erase Unit Table and modify ReplUnitTable[] accordingly */
227 for (i
= 0; i
< nftl
->nb_blocks
; i
++) {
229 The
new DiskOnChip driver already scanned the bad block table
. Just query it
.
230 if ((i
& (SECTORSIZE
- 1)) == 0) {
231 /* read one sector for every SECTORSIZE of blocks */
232 if ((ret
= MTD_READECC(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+
233 i
+ SECTORSIZE
, SECTORSIZE
, &retlen
, buf
,
234 (char *)&oob
, NULL
)) < 0) {
235 printk(KERN_NOTICE
"Read of bad sector table failed (err %d)\n",
237 kfree(nftl
->ReplUnitTable
);
238 kfree(nftl
->EUNtable
);
242 /* mark the Bad Erase Unit as RESERVED in ReplUnitTable */
243 if (buf
[i
& (SECTORSIZE
- 1)] != 0xff)
244 nftl
->ReplUnitTable
[i
] = BLOCK_RESERVED
;
246 if (nftl
->mbd
.mtd
->block_isbad(nftl
->mbd
.mtd
, i
* nftl
->EraseSize
))
247 nftl
->ReplUnitTable
[i
] = BLOCK_RESERVED
;
250 nftl
->MediaUnit
= block
;
253 } /* foreach (block) */
255 return boot_record_count
?0:-1;
258 static int memcmpb(void *a
, int c
, int n
)
261 for (i
= 0; i
< n
; i
++) {
262 if (c
!= ((unsigned char *)a
)[i
])
268 /* check_free_sector: check if a free sector is actually FREE, i.e. All 0xff in data and oob area */
269 static int check_free_sectors(struct NFTLrecord
*nftl
, unsigned int address
, int len
,
274 u8 buf
[SECTORSIZE
+ nftl
->mbd
.mtd
->oobsize
];
276 for (i
= 0; i
< len
; i
+= SECTORSIZE
) {
277 if (MTD_READECC(nftl
->mbd
.mtd
, address
, SECTORSIZE
, &retlen
, buf
, &buf
[SECTORSIZE
], &nftl
->oobinfo
) < 0)
279 if (memcmpb(buf
, 0xff, SECTORSIZE
) != 0)
283 if (memcmpb(buf
+ SECTORSIZE
, 0xff, nftl
->mbd
.mtd
->oobsize
) != 0)
286 address
+= SECTORSIZE
;
292 /* NFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase Unit and
293 * Update NFTL metadata. Each erase operation is checked with check_free_sectors
295 * Return: 0 when succeed, -1 on error.
297 * ToDo: 1. Is it neceressary to check_free_sector after erasing ??
299 int NFTL_formatblock(struct NFTLrecord
*nftl
, int block
)
302 unsigned int nb_erases
, erase_mark
;
303 struct nftl_uci1 uci
;
304 struct erase_info
*instr
= &nftl
->instr
;
306 /* Read the Unit Control Information #1 for Wear-Leveling */
307 if (MTD_READOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ SECTORSIZE
+ 8,
308 8, &retlen
, (char *)&uci
) < 0)
311 erase_mark
= le16_to_cpu ((uci
.EraseMark
| uci
.EraseMark1
));
312 if (erase_mark
!= ERASE_MARK
) {
314 uci
.EraseMark
= cpu_to_le16(ERASE_MARK
);
315 uci
.EraseMark1
= cpu_to_le16(ERASE_MARK
);
316 uci
.WearInfo
= cpu_to_le32(0);
319 memset(instr
, 0, sizeof(struct erase_info
));
321 /* XXX: use async erase interface, XXX: test return code */
322 instr
->addr
= block
* nftl
->EraseSize
;
323 instr
->len
= nftl
->EraseSize
;
324 MTD_ERASE(nftl
->mbd
.mtd
, instr
);
326 if (instr
->state
== MTD_ERASE_FAILED
) {
327 printk("Error while formatting block %d\n", block
);
331 /* increase and write Wear-Leveling info */
332 nb_erases
= le32_to_cpu(uci
.WearInfo
);
335 /* wrap (almost impossible with current flashs) or free block */
339 /* check the "freeness" of Erase Unit before updating metadata
340 * FixMe: is this check really necessary ? since we have check the
341 * return code after the erase operation. */
342 if (check_free_sectors(nftl
, instr
->addr
, nftl
->EraseSize
, 1) != 0)
345 uci
.WearInfo
= le32_to_cpu(nb_erases
);
346 if (MTD_WRITEOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ SECTORSIZE
+ 8, 8,
347 &retlen
, (char *)&uci
) < 0)
351 /* could not format, update the bad block table (caller is responsible
352 for setting the ReplUnitTable to BLOCK_RESERVED on failure) */
353 nftl
->mbd
.mtd
->block_markbad(nftl
->mbd
.mtd
, instr
->addr
);
357 /* check_sectors_in_chain: Check that each sector of a Virtual Unit Chain is correct.
358 * Mark as 'IGNORE' each incorrect sector. This check is only done if the chain
359 * was being folded when NFTL was interrupted.
361 * The check_free_sectors in this function is neceressary. There is a possible
362 * situation that after writing the Data area, the Block Control Information is
363 * not updated according (due to power failure or something) which leaves the block
364 * in an umconsistent state. So we have to check if a block is really FREE in this
366 static void check_sectors_in_chain(struct NFTLrecord
*nftl
, unsigned int first_block
)
368 unsigned int block
, i
, status
;
370 int sectors_per_block
;
373 sectors_per_block
= nftl
->EraseSize
/ SECTORSIZE
;
376 for (i
= 0; i
< sectors_per_block
; i
++) {
377 if (MTD_READOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ i
* SECTORSIZE
,
378 8, &retlen
, (char *)&bci
) < 0)
379 status
= SECTOR_IGNORE
;
381 status
= bci
.Status
| bci
.Status1
;
385 /* verify that the sector is really free. If not, mark
387 if (memcmpb(&bci
, 0xff, 8) != 0 ||
388 check_free_sectors(nftl
, block
* nftl
->EraseSize
+ i
* SECTORSIZE
,
389 SECTORSIZE
, 0) != 0) {
390 printk("Incorrect free sector %d in block %d: "
391 "marking it as ignored\n",
394 /* sector not free actually : mark it as SECTOR_IGNORE */
395 bci
.Status
= SECTOR_IGNORE
;
396 bci
.Status1
= SECTOR_IGNORE
;
397 MTD_WRITEOOB(nftl
->mbd
.mtd
,
398 block
* nftl
->EraseSize
+ i
* SECTORSIZE
,
399 8, &retlen
, (char *)&bci
);
407 /* proceed to next Erase Unit on the chain */
408 block
= nftl
->ReplUnitTable
[block
];
409 if (!(block
== BLOCK_NIL
|| block
< nftl
->nb_blocks
))
410 printk("incorrect ReplUnitTable[] : %d\n", block
);
411 if (block
== BLOCK_NIL
|| block
>= nftl
->nb_blocks
)
416 /* calc_chain_lenght: Walk through a Virtual Unit Chain and estimate chain length */
417 static int calc_chain_length(struct NFTLrecord
*nftl
, unsigned int first_block
)
419 unsigned int length
= 0, block
= first_block
;
423 /* avoid infinite loops, although this is guaranted not to
424 happen because of the previous checks */
425 if (length
>= nftl
->nb_blocks
) {
426 printk("nftl: length too long %d !\n", length
);
430 block
= nftl
->ReplUnitTable
[block
];
431 if (!(block
== BLOCK_NIL
|| block
< nftl
->nb_blocks
))
432 printk("incorrect ReplUnitTable[] : %d\n", block
);
433 if (block
== BLOCK_NIL
|| block
>= nftl
->nb_blocks
)
439 /* format_chain: Format an invalid Virtual Unit chain. It frees all the Erase Units in a
440 * Virtual Unit Chain, i.e. all the units are disconnected.
442 * It is not stricly correct to begin from the first block of the chain because
443 * if we stop the code, we may see again a valid chain if there was a first_block
444 * flag in a block inside it. But is it really a problem ?
446 * FixMe: Figure out what the last statesment means. What if power failure when we are
447 * in the for (;;) loop formatting blocks ??
449 static void format_chain(struct NFTLrecord
*nftl
, unsigned int first_block
)
451 unsigned int block
= first_block
, block1
;
453 printk("Formatting chain at block %d\n", first_block
);
456 block1
= nftl
->ReplUnitTable
[block
];
458 printk("Formatting block %d\n", block
);
459 if (NFTL_formatblock(nftl
, block
) < 0) {
460 /* cannot format !!!! Mark it as Bad Unit */
461 nftl
->ReplUnitTable
[block
] = BLOCK_RESERVED
;
463 nftl
->ReplUnitTable
[block
] = BLOCK_FREE
;
466 /* goto next block on the chain */
469 if (!(block
== BLOCK_NIL
|| block
< nftl
->nb_blocks
))
470 printk("incorrect ReplUnitTable[] : %d\n", block
);
471 if (block
== BLOCK_NIL
|| block
>= nftl
->nb_blocks
)
476 /* check_and_mark_free_block: Verify that a block is free in the NFTL sense (valid erase mark) or
477 * totally free (only 0xff).
479 * Definition: Free Erase Unit -- A properly erased/formatted Free Erase Unit should have meet the
482 static int check_and_mark_free_block(struct NFTLrecord
*nftl
, int block
)
485 unsigned int erase_mark
;
488 /* check erase mark. */
489 if (MTD_READOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ SECTORSIZE
+ 8, 8,
490 &retlen
, (char *)&h1
) < 0)
493 erase_mark
= le16_to_cpu ((h1
.EraseMark
| h1
.EraseMark1
));
494 if (erase_mark
!= ERASE_MARK
) {
495 /* if no erase mark, the block must be totally free. This is
496 possible in two cases : empty filsystem or interrupted erase (very unlikely) */
497 if (check_free_sectors (nftl
, block
* nftl
->EraseSize
, nftl
->EraseSize
, 1) != 0)
500 /* free block : write erase mark */
501 h1
.EraseMark
= cpu_to_le16(ERASE_MARK
);
502 h1
.EraseMark1
= cpu_to_le16(ERASE_MARK
);
503 h1
.WearInfo
= cpu_to_le32(0);
504 if (MTD_WRITEOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ SECTORSIZE
+ 8, 8,
505 &retlen
, (char *)&h1
) < 0)
509 /* if erase mark present, need to skip it when doing check */
510 for (i
= 0; i
< nftl
->EraseSize
; i
+= SECTORSIZE
) {
511 /* check free sector */
512 if (check_free_sectors (nftl
, block
* nftl
->EraseSize
+ i
,
516 if (MTD_READOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ i
,
517 16, &retlen
, buf
) < 0)
519 if (i
== SECTORSIZE
) {
520 /* skip erase mark */
521 if (memcmpb(buf
, 0xff, 8))
524 if (memcmpb(buf
, 0xff, 16))
534 /* get_fold_mark: Read fold mark from Unit Control Information #2, we use FOLD_MARK_IN_PROGRESS
535 * to indicate that we are in the progression of a Virtual Unit Chain folding. If the UCI #2
536 * is FOLD_MARK_IN_PROGRESS when mounting the NFTL, the (previous) folding process is interrupted
537 * for some reason. A clean up/check of the VUC is neceressary in this case.
539 * WARNING: return 0 if read error
541 static int get_fold_mark(struct NFTLrecord
*nftl
, unsigned int block
)
543 struct nftl_uci2 uci
;
546 if (MTD_READOOB(nftl
->mbd
.mtd
, block
* nftl
->EraseSize
+ 2 * SECTORSIZE
+ 8,
547 8, &retlen
, (char *)&uci
) < 0)
550 return le16_to_cpu((uci
.FoldMark
| uci
.FoldMark1
));
553 int NFTL_mount(struct NFTLrecord
*s
)
556 unsigned int first_logical_block
, logical_block
, rep_block
, nb_erases
, erase_mark
;
557 unsigned int block
, first_block
, is_first_block
;
558 int chain_length
, do_format_chain
;
563 /* search for NFTL MediaHeader and Spare NFTL Media Header */
564 if (find_boot_record(s
) < 0) {
565 printk("Could not find valid boot record\n");
569 /* init the logical to physical table */
570 for (i
= 0; i
< s
->nb_blocks
; i
++) {
571 s
->EUNtable
[i
] = BLOCK_NIL
;
574 /* first pass : explore each block chain */
575 first_logical_block
= 0;
576 for (first_block
= 0; first_block
< s
->nb_blocks
; first_block
++) {
577 /* if the block was not already explored, we can look at it */
578 if (s
->ReplUnitTable
[first_block
] == BLOCK_NOTEXPLORED
) {
584 /* read the block header. If error, we format the chain */
585 if (MTD_READOOB(s
->mbd
.mtd
, block
* s
->EraseSize
+ 8, 8,
586 &retlen
, (char *)&h0
) < 0 ||
587 MTD_READOOB(s
->mbd
.mtd
, block
* s
->EraseSize
+ SECTORSIZE
+ 8, 8,
588 &retlen
, (char *)&h1
) < 0) {
589 s
->ReplUnitTable
[block
] = BLOCK_NIL
;
594 logical_block
= le16_to_cpu ((h0
.VirtUnitNum
| h0
.SpareVirtUnitNum
));
595 rep_block
= le16_to_cpu ((h0
.ReplUnitNum
| h0
.SpareReplUnitNum
));
596 nb_erases
= le32_to_cpu (h1
.WearInfo
);
597 erase_mark
= le16_to_cpu ((h1
.EraseMark
| h1
.EraseMark1
));
599 is_first_block
= !(logical_block
>> 15);
600 logical_block
= logical_block
& 0x7fff;
602 /* invalid/free block test */
603 if (erase_mark
!= ERASE_MARK
|| logical_block
>= s
->nb_blocks
) {
604 if (chain_length
== 0) {
605 /* if not currently in a chain, we can handle it safely */
606 if (check_and_mark_free_block(s
, block
) < 0) {
607 /* not really free: format it */
608 printk("Formatting block %d\n", block
);
609 if (NFTL_formatblock(s
, block
) < 0) {
610 /* could not format: reserve the block */
611 s
->ReplUnitTable
[block
] = BLOCK_RESERVED
;
613 s
->ReplUnitTable
[block
] = BLOCK_FREE
;
616 /* free block: mark it */
617 s
->ReplUnitTable
[block
] = BLOCK_FREE
;
619 /* directly examine the next block. */
620 goto examine_ReplUnitTable
;
622 /* the block was in a chain : this is bad. We
623 must format all the chain */
624 printk("Block %d: free but referenced in chain %d\n",
626 s
->ReplUnitTable
[block
] = BLOCK_NIL
;
632 /* we accept only first blocks here */
633 if (chain_length
== 0) {
634 /* this block is not the first block in chain :
635 ignore it, it will be included in a chain
636 later, or marked as not explored */
638 goto examine_ReplUnitTable
;
639 first_logical_block
= logical_block
;
641 if (logical_block
!= first_logical_block
) {
642 printk("Block %d: incorrect logical block: %d expected: %d\n",
643 block
, logical_block
, first_logical_block
);
644 /* the chain is incorrect : we must format it,
645 but we need to read it completly */
648 if (is_first_block
) {
649 /* we accept that a block is marked as first
650 block while being last block in a chain
651 only if the chain is being folded */
652 if (get_fold_mark(s
, block
) != FOLD_MARK_IN_PROGRESS
||
653 rep_block
!= 0xffff) {
654 printk("Block %d: incorrectly marked as first block in chain\n",
656 /* the chain is incorrect : we must format it,
657 but we need to read it completly */
660 printk("Block %d: folding in progress - ignoring first block flag\n",
666 if (rep_block
== 0xffff) {
667 /* no more blocks after */
668 s
->ReplUnitTable
[block
] = BLOCK_NIL
;
670 } else if (rep_block
>= s
->nb_blocks
) {
671 printk("Block %d: referencing invalid block %d\n",
674 s
->ReplUnitTable
[block
] = BLOCK_NIL
;
676 } else if (s
->ReplUnitTable
[rep_block
] != BLOCK_NOTEXPLORED
) {
677 /* same problem as previous 'is_first_block' test:
678 we accept that the last block of a chain has
679 the first_block flag set if folding is in
680 progress. We handle here the case where the
681 last block appeared first */
682 if (s
->ReplUnitTable
[rep_block
] == BLOCK_NIL
&&
683 s
->EUNtable
[first_logical_block
] == rep_block
&&
684 get_fold_mark(s
, first_block
) == FOLD_MARK_IN_PROGRESS
) {
685 /* EUNtable[] will be set after */
686 printk("Block %d: folding in progress - ignoring first block flag\n",
688 s
->ReplUnitTable
[block
] = rep_block
;
689 s
->EUNtable
[first_logical_block
] = BLOCK_NIL
;
691 printk("Block %d: referencing block %d already in another chain\n",
693 /* XXX: should handle correctly fold in progress chains */
695 s
->ReplUnitTable
[block
] = BLOCK_NIL
;
700 s
->ReplUnitTable
[block
] = rep_block
;
705 /* the chain was completely explored. Now we can decide
706 what to do with it */
707 if (do_format_chain
) {
708 /* invalid chain : format it */
709 format_chain(s
, first_block
);
711 unsigned int first_block1
, chain_to_format
, chain_length1
;
714 /* valid chain : get foldmark */
715 fold_mark
= get_fold_mark(s
, first_block
);
716 if (fold_mark
== 0) {
717 /* cannot get foldmark : format the chain */
718 printk("Could read foldmark at block %d\n", first_block
);
719 format_chain(s
, first_block
);
721 if (fold_mark
== FOLD_MARK_IN_PROGRESS
)
722 check_sectors_in_chain(s
, first_block
);
724 /* now handle the case where we find two chains at the
725 same virtual address : we select the longer one,
726 because the shorter one is the one which was being
727 folded if the folding was not done in place */
728 first_block1
= s
->EUNtable
[first_logical_block
];
729 if (first_block1
!= BLOCK_NIL
) {
730 /* XXX: what to do if same length ? */
731 chain_length1
= calc_chain_length(s
, first_block1
);
732 printk("Two chains at blocks %d (len=%d) and %d (len=%d)\n",
733 first_block1
, chain_length1
, first_block
, chain_length
);
735 if (chain_length
>= chain_length1
) {
736 chain_to_format
= first_block1
;
737 s
->EUNtable
[first_logical_block
] = first_block
;
739 chain_to_format
= first_block
;
741 format_chain(s
, chain_to_format
);
743 s
->EUNtable
[first_logical_block
] = first_block
;
748 examine_ReplUnitTable
:;
751 /* second pass to format unreferenced blocks and init free block count */
753 s
->LastFreeEUN
= le16_to_cpu(s
->MediaHdr
.FirstPhysicalEUN
);
755 for (block
= 0; block
< s
->nb_blocks
; block
++) {
756 if (s
->ReplUnitTable
[block
] == BLOCK_NOTEXPLORED
) {
757 printk("Unreferenced block %d, formatting it\n", block
);
758 if (NFTL_formatblock(s
, block
) < 0)
759 s
->ReplUnitTable
[block
] = BLOCK_RESERVED
;
761 s
->ReplUnitTable
[block
] = BLOCK_FREE
;
763 if (s
->ReplUnitTable
[block
] == BLOCK_FREE
) {
765 s
->LastFreeEUN
= block
;