blob: 2a1c976c7924c8674cda40985a5848cfe9ff02ef [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2001-2007 Red Hat, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
David Woodhousec00c3102007-04-25 14:16:47 +010011
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/kernel.h>
13#include <linux/sched.h>
14#include <linux/slab.h>
15#include <linux/mtd/mtd.h>
16#include <linux/pagemap.h>
17#include <linux/crc32.h>
18#include <linux/compiler.h>
19#include "nodelist.h"
Ferenc Havasie631ddb2005-09-07 09:35:26 +010020#include "summary.h"
21#include "debug.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Andrew Victor3be36672005-02-09 09:09:05 +000023#define DEFAULT_EMPTY_SCAN_SIZE 1024
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define noisy_printk(noise, args...) do { \
26 if (*(noise)) { \
27 printk(KERN_NOTICE args); \
28 (*(noise))--; \
29 if (!(*(noise))) { \
30 printk(KERN_NOTICE "Further such events for this erase block will not be printed\n"); \
31 } \
32 } \
33} while(0)
34
35static uint32_t pseudo_random;
36
37static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
Ferenc Havasie631ddb2005-09-07 09:35:26 +010038 unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000040/* These helper functions _must_ increase ofs and also do the dirty/used space accounting.
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 * Returning an error will abort the mount - bad checksums etc. should just mark the space
42 * as dirty.
43 */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000044static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
Ferenc Havasie631ddb2005-09-07 09:35:26 +010045 struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
Ferenc Havasie631ddb2005-09-07 09:35:26 +010047 struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49static inline int min_free(struct jffs2_sb_info *c)
50{
51 uint32_t min = 2 * sizeof(struct jffs2_raw_inode);
Andrew Victor2f82ce12005-02-09 09:24:26 +000052#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize)
54 return c->wbuf_pagesize;
55#endif
56 return min;
57
58}
Andrew Victor3be36672005-02-09 09:09:05 +000059
60static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) {
61 if (sector_size < DEFAULT_EMPTY_SCAN_SIZE)
62 return sector_size;
63 else
64 return DEFAULT_EMPTY_SCAN_SIZE;
65}
66
David Woodhouse25090a62006-05-21 03:57:56 +010067static int file_dirty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
68{
David Woodhousea6a8bef2006-05-29 00:41:11 +010069 int ret;
70
71 if ((ret = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
72 return ret;
73 if ((ret = jffs2_scan_dirty_space(c, jeb, jeb->free_size)))
David Woodhouse25090a62006-05-21 03:57:56 +010074 return ret;
75 /* Turned wasted size into dirty, since we apparently
76 think it's recoverable now. */
77 jeb->dirty_size += jeb->wasted_size;
78 c->dirty_size += jeb->wasted_size;
79 c->wasted_size -= jeb->wasted_size;
80 jeb->wasted_size = 0;
81 if (VERYDIRTY(c, jeb->dirty_size)) {
82 list_add(&jeb->list, &c->very_dirty_list);
83 } else {
84 list_add(&jeb->list, &c->dirty_list);
85 }
86 return 0;
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089int jffs2_scan_medium(struct jffs2_sb_info *c)
90{
91 int i, ret;
92 uint32_t empty_blocks = 0, bad_blocks = 0;
93 unsigned char *flashbuf = NULL;
94 uint32_t buf_size = 0;
Ferenc Havasie631ddb2005-09-07 09:35:26 +010095 struct jffs2_summary *s = NULL; /* summary info collected by the scan process */
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#ifndef __ECOS
97 size_t pointlen;
98
99 if (c->mtd->point) {
100 ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf);
101 if (!ret && pointlen < c->mtd->size) {
102 /* Don't muck about if it won't let us point to the whole flash */
103 D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen));
104 c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size);
105 flashbuf = NULL;
106 }
107 if (ret)
108 D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
109 }
110#endif
111 if (!flashbuf) {
112 /* For NAND it's quicker to read a whole eraseblock at a time,
113 apparently */
114 if (jffs2_cleanmarker_oob(c))
115 buf_size = c->sector_size;
116 else
117 buf_size = PAGE_SIZE;
118
119 /* Respect kmalloc limitations */
120 if (buf_size > 128*1024)
121 buf_size = 128*1024;
122
123 D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size));
124 flashbuf = kmalloc(buf_size, GFP_KERNEL);
125 if (!flashbuf)
126 return -ENOMEM;
127 }
128
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100129 if (jffs2_sum_active()) {
Yan Burman3d375d92006-12-04 15:03:01 -0800130 s = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100131 if (!s) {
Amit Choudhary85de3d92007-01-02 21:16:10 +0000132 kfree(flashbuf);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100133 JFFS2_WARNING("Can't allocate memory for summary\n");
134 return -ENOMEM;
135 }
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100136 }
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 for (i=0; i<c->nr_blocks; i++) {
139 struct jffs2_eraseblock *jeb = &c->blocks[i];
140
Artem Bityutskiya2166b92006-12-28 12:01:41 +0200141 cond_resched();
142
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100143 /* reset summary info for next eraseblock scan */
144 jffs2_sum_reset_collected(s);
145
146 ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
147 buf_size, s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 if (ret < 0)
150 goto out;
151
Artem B. Bityutskiye0c8e422005-07-24 16:14:17 +0100152 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 /* Now decide which list to put it on */
155 switch(ret) {
156 case BLK_STATE_ALLFF:
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000157 /*
158 * Empty block. Since we can't be sure it
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * was entirely erased, we just queue it for erase
160 * again. It will be marked as such when the erase
161 * is complete. Meanwhile we still count it as empty
162 * for later checks.
163 */
164 empty_blocks++;
165 list_add(&jeb->list, &c->erase_pending_list);
166 c->nr_erasing_blocks++;
167 break;
168
169 case BLK_STATE_CLEANMARKER:
170 /* Only a CLEANMARKER node is valid */
171 if (!jeb->dirty_size) {
172 /* It's actually free */
173 list_add(&jeb->list, &c->free_list);
174 c->nr_free_blocks++;
175 } else {
176 /* Dirt */
177 D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset));
178 list_add(&jeb->list, &c->erase_pending_list);
179 c->nr_erasing_blocks++;
180 }
181 break;
182
183 case BLK_STATE_CLEAN:
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100184 /* Full (or almost full) of clean data. Clean list */
185 list_add(&jeb->list, &c->clean_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 break;
187
188 case BLK_STATE_PARTDIRTY:
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100189 /* Some data, but not full. Dirty list. */
190 /* We want to remember the block with most free space
191 and stick it in the 'nextblock' position to start writing to it. */
192 if (jeb->free_size > min_free(c) &&
193 (!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
194 /* Better candidate for the next writes to go to */
195 if (c->nextblock) {
David Woodhouse25090a62006-05-21 03:57:56 +0100196 ret = file_dirty(c, c->nextblock);
197 if (ret)
198 return ret;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100199 /* deleting summary information of the old nextblock */
200 jffs2_sum_reset_collected(c->summary);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 }
David Woodhouse25090a62006-05-21 03:57:56 +0100202 /* update collected summary information for the current nextblock */
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100203 jffs2_sum_move_collected(c, s);
204 D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset));
205 c->nextblock = jeb;
206 } else {
David Woodhouse25090a62006-05-21 03:57:56 +0100207 ret = file_dirty(c, jeb);
208 if (ret)
209 return ret;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 break;
212
213 case BLK_STATE_ALLDIRTY:
214 /* Nothing valid - not even a clean marker. Needs erasing. */
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100215 /* For now we just put it on the erasing list. We'll start the erases later */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset));
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100217 list_add(&jeb->list, &c->erase_pending_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 c->nr_erasing_blocks++;
219 break;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 case BLK_STATE_BADBLOCK:
222 D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset));
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100223 list_add(&jeb->list, &c->bad_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 c->bad_size += c->sector_size;
225 c->free_size -= c->sector_size;
226 bad_blocks++;
227 break;
228 default:
229 printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n");
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100230 BUG();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232 }
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 /* Nextblock dirty is always seen as wasted, because we cannot recycle it now */
235 if (c->nextblock && (c->nextblock->dirty_size)) {
236 c->nextblock->wasted_size += c->nextblock->dirty_size;
237 c->wasted_size += c->nextblock->dirty_size;
238 c->dirty_size -= c->nextblock->dirty_size;
239 c->nextblock->dirty_size = 0;
240 }
Andrew Victor2f82ce12005-02-09 09:24:26 +0000241#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
David Woodhousee96fb232006-03-07 21:55:36 -0800242 if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000243 /* If we're going to start writing into a block which already
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 contains data, and the end of the data isn't page-aligned,
245 skip a little and align it. */
246
Artem B. Bityutskiydaba5cc2005-09-30 14:59:17 +0100247 uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n",
250 skip));
David Woodhouse046b8b92006-05-25 01:50:35 +0100251 jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
David Woodhousef5609282006-05-25 01:37:28 +0100252 jffs2_scan_dirty_space(c, c->nextblock, skip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
254#endif
255 if (c->nr_erasing_blocks) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000256 if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
258 printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks);
259 ret = -EIO;
260 goto out;
261 }
262 jffs2_erase_pending_trigger(c);
263 }
264 ret = 0;
265 out:
266 if (buf_size)
267 kfree(flashbuf);
268#ifndef __ECOS
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000269 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size);
271#endif
Florin Malita5b5ffbc2006-05-15 23:42:31 +0100272 if (s)
273 kfree(s);
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return ret;
276}
277
Adrian Bunkc05d52c2006-06-22 12:03:35 +0200278static int jffs2_fill_scan_buf(struct jffs2_sb_info *c, void *buf,
279 uint32_t ofs, uint32_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
281 int ret;
282 size_t retlen;
283
284 ret = jffs2_flash_read(c, ofs, len, &retlen, buf);
285 if (ret) {
286 D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret));
287 return ret;
288 }
289 if (retlen < len) {
290 D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen));
291 return -EIO;
292 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 return 0;
294}
295
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100296int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
297{
298 if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size
David Woodhouse99988f72006-05-24 09:04:17 +0100299 && (!jeb->first_node || !ref_next(jeb->first_node)) )
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100300 return BLK_STATE_CLEANMARKER;
301
302 /* move blocks with max 4 byte dirty space to cleanlist */
303 else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) {
304 c->dirty_size -= jeb->dirty_size;
305 c->wasted_size += jeb->dirty_size;
306 jeb->wasted_size += jeb->dirty_size;
307 jeb->dirty_size = 0;
308 return BLK_STATE_CLEAN;
309 } else if (jeb->used_size || jeb->unchecked_size)
310 return BLK_STATE_PARTDIRTY;
311 else
312 return BLK_STATE_ALLDIRTY;
313}
314
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900315#ifdef CONFIG_JFFS2_FS_XATTR
316static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
317 struct jffs2_raw_xattr *rx, uint32_t ofs,
318 struct jffs2_summary *s)
319{
320 struct jffs2_xattr_datum *xd;
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900321 uint32_t xid, version, totlen, crc;
David Woodhouse68270992006-05-21 03:46:05 +0100322 int err;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900323
324 crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4);
325 if (crc != je32_to_cpu(rx->node_crc)) {
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900326 JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
327 ofs, je32_to_cpu(rx->node_crc), crc);
David Woodhouse68270992006-05-21 03:46:05 +0100328 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen))))
329 return err;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900330 return 0;
331 }
332
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900333 xid = je32_to_cpu(rx->xid);
334 version = je32_to_cpu(rx->version);
335
KaiGai Kohei8a136952006-06-24 09:14:13 +0900336 totlen = PAD(sizeof(struct jffs2_raw_xattr)
337 + rx->name_len + 1 + je16_to_cpu(rx->value_len));
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900338 if (totlen != je32_to_cpu(rx->totlen)) {
339 JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
340 ofs, je32_to_cpu(rx->totlen), totlen);
David Woodhouse68270992006-05-21 03:46:05 +0100341 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen))))
342 return err;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900343 return 0;
344 }
345
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900346 xd = jffs2_setup_xattr_datum(c, xid, version);
347 if (IS_ERR(xd))
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900348 return PTR_ERR(xd);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900349
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900350 if (xd->version > version) {
351 struct jffs2_raw_node_ref *raw
352 = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL);
353 raw->next_in_ino = xd->node->next_in_ino;
354 xd->node->next_in_ino = raw;
355 } else {
356 xd->version = version;
357 xd->xprefix = rx->xprefix;
358 xd->name_len = rx->name_len;
359 xd->value_len = je16_to_cpu(rx->value_len);
360 xd->data_crc = je32_to_cpu(rx->data_crc);
361
362 jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd);
363 }
David Woodhousef1f96712006-05-20 19:45:26 +0100364
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900365 if (jffs2_sum_active())
366 jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset);
367 dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n",
368 ofs, xd->xid, xd->version);
369 return 0;
370}
371
372static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
373 struct jffs2_raw_xref *rr, uint32_t ofs,
374 struct jffs2_summary *s)
375{
376 struct jffs2_xattr_ref *ref;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900377 uint32_t crc;
David Woodhouse68270992006-05-21 03:46:05 +0100378 int err;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900379
380 crc = crc32(0, rr, sizeof(*rr) - 4);
381 if (crc != je32_to_cpu(rr->node_crc)) {
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900382 JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
383 ofs, je32_to_cpu(rr->node_crc), crc);
David Woodhouse68270992006-05-21 03:46:05 +0100384 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen)))))
385 return err;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900386 return 0;
387 }
388
389 if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) {
David Woodhouse89291a92006-05-25 13:30:24 +0100390 JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n",
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900391 ofs, je32_to_cpu(rr->totlen),
392 PAD(sizeof(struct jffs2_raw_xref)));
David Woodhouse68270992006-05-21 03:46:05 +0100393 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen))))
394 return err;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900395 return 0;
396 }
397
398 ref = jffs2_alloc_xattr_ref();
399 if (!ref)
400 return -ENOMEM;
401
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900402 /* BEFORE jffs2_build_xattr_subsystem() called,
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900403 * and AFTER xattr_ref is marked as a dead xref,
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900404 * ref->xid is used to store 32bit xid, xd is not used
405 * ref->ino is used to store 32bit inode-number, ic is not used
406 * Thoes variables are declared as union, thus using those
KaiGai Kohei8f2b6f42006-05-13 15:15:07 +0900407 * are exclusive. In a similar way, ref->next is temporarily
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900408 * used to chain all xattr_ref object. It's re-chained to
409 * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly.
410 */
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900411 ref->ino = je32_to_cpu(rr->ino);
412 ref->xid = je32_to_cpu(rr->xid);
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900413 ref->xseqno = je32_to_cpu(rr->xseqno);
414 if (ref->xseqno > c->highest_xseqno)
415 c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
KaiGai Kohei8f2b6f42006-05-13 15:15:07 +0900416 ref->next = c->xref_temp;
417 c->xref_temp = ref;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900418
KaiGai Koheic9f700f2006-06-11 10:35:15 +0900419 jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref);
David Woodhousef1f96712006-05-20 19:45:26 +0100420
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900421 if (jffs2_sum_active())
422 jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset);
423 dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n",
424 ofs, ref->xid, ref->ino);
425 return 0;
426}
427#endif
428
David Woodhouse9641b782006-05-20 16:13:34 +0100429/* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into
430 the flash, XIP-style */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
David Woodhouse9641b782006-05-20 16:13:34 +0100432 unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 struct jffs2_unknown_node *node;
434 struct jffs2_unknown_node crcnode;
435 uint32_t ofs, prevofs;
436 uint32_t hdr_crc, buf_ofs, buf_len;
437 int err;
438 int noise = 0;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100439
440
Andrew Victor2f82ce12005-02-09 09:24:26 +0000441#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 int cleanmarkerfound = 0;
443#endif
444
445 ofs = jeb->offset;
446 prevofs = jeb->offset - 1;
447
448 D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));
449
Andrew Victor2f82ce12005-02-09 09:24:26 +0000450#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 if (jffs2_cleanmarker_oob(c)) {
Artem Bityutskiya7a6ace12007-01-31 11:38:53 +0200452 int ret;
453
454 if (c->mtd->block_isbad(c->mtd, jeb->offset))
455 return BLK_STATE_BADBLOCK;
456
457 ret = jffs2_check_nand_cleanmarker(c, jeb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret));
Artem Bityutskiya7a6ace12007-01-31 11:38:53 +0200459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 /* Even if it's not found, we still scan to see
461 if the block is empty. We use this information
462 to decide whether to erase it or not. */
463 switch (ret) {
464 case 0: cleanmarkerfound = 1; break;
465 case 1: break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 default: return ret;
467 }
468 }
469#endif
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100470
471 if (jffs2_sum_active()) {
David Woodhouse9641b782006-05-20 16:13:34 +0100472 struct jffs2_sum_marker *sm;
473 void *sumptr = NULL;
474 uint32_t sumlen;
475
476 if (!buf_size) {
477 /* XIP case. Just look, point at the summary if it's there */
David Woodhouse13ba42d2006-05-30 08:59:34 +0100478 sm = (void *)buf + c->sector_size - sizeof(*sm);
David Woodhouse9641b782006-05-20 16:13:34 +0100479 if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
480 sumptr = buf + je32_to_cpu(sm->offset);
481 sumlen = c->sector_size - je32_to_cpu(sm->offset);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100482 }
David Woodhouse9641b782006-05-20 16:13:34 +0100483 } else {
484 /* If NAND flash, read a whole page of it. Else just the end */
485 if (c->wbuf_pagesize)
486 buf_len = c->wbuf_pagesize;
487 else
488 buf_len = sizeof(*sm);
489
490 /* Read as much as we want into the _end_ of the preallocated buffer */
491 err = jffs2_fill_scan_buf(c, buf + buf_size - buf_len,
492 jeb->offset + c->sector_size - buf_len,
493 buf_len);
494 if (err)
495 return err;
496
497 sm = (void *)buf + buf_size - sizeof(*sm);
498 if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC) {
499 sumlen = c->sector_size - je32_to_cpu(sm->offset);
500 sumptr = buf + buf_size - sumlen;
501
502 /* Now, make sure the summary itself is available */
503 if (sumlen > buf_size) {
504 /* Need to kmalloc for this. */
505 sumptr = kmalloc(sumlen, GFP_KERNEL);
506 if (!sumptr)
507 return -ENOMEM;
508 memcpy(sumptr + sumlen - buf_len, buf + buf_size - buf_len, buf_len);
509 }
510 if (buf_len < sumlen) {
511 /* Need to read more so that the entire summary node is present */
512 err = jffs2_fill_scan_buf(c, sumptr,
513 jeb->offset + c->sector_size - sumlen,
514 sumlen - buf_len);
515 if (err)
516 return err;
517 }
518 }
519
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100520 }
521
David Woodhouse9641b782006-05-20 16:13:34 +0100522 if (sumptr) {
523 err = jffs2_sum_scan_sumnode(c, jeb, sumptr, sumlen, &pseudo_random);
David Woodhouse35601602006-05-21 01:28:05 +0100524
David Woodhouse9641b782006-05-20 16:13:34 +0100525 if (buf_size && sumlen > buf_size)
526 kfree(sumptr);
David Woodhouse35601602006-05-21 01:28:05 +0100527 /* If it returns with a real error, bail.
528 If it returns positive, that's a block classification
529 (i.e. BLK_STATE_xxx) so return that too.
530 If it returns zero, fall through to full scan. */
531 if (err)
532 return err;
David Woodhouse9641b782006-05-20 16:13:34 +0100533 }
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100534 }
535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 buf_ofs = jeb->offset;
537
538 if (!buf_size) {
David Woodhouse9641b782006-05-20 16:13:34 +0100539 /* This is the XIP case -- we're reading _directly_ from the flash chip */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 buf_len = c->sector_size;
541 } else {
Andrew Victor3be36672005-02-09 09:09:05 +0000542 buf_len = EMPTY_SCAN_SIZE(c->sector_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
544 if (err)
545 return err;
546 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 /* We temporarily use 'ofs' as a pointer into the buffer/jeb */
549 ofs = 0;
550
551 /* Scan only 4KiB of 0xFF before declaring it's empty */
Andrew Victor3be36672005-02-09 09:09:05 +0000552 while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 ofs += 4;
554
Andrew Victor3be36672005-02-09 09:09:05 +0000555 if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) {
Andrew Victor2f82ce12005-02-09 09:24:26 +0000556#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 if (jffs2_cleanmarker_oob(c)) {
558 /* scan oob, take care of cleanmarker */
559 int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
560 D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret));
561 switch (ret) {
562 case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
563 case 1: return BLK_STATE_ALLDIRTY;
564 default: return ret;
565 }
566 }
567#endif
568 D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset));
Andrew Victor8f15fd52005-02-09 09:17:45 +0000569 if (c->cleanmarker_size == 0)
570 return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */
571 else
572 return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 }
574 if (ofs) {
575 D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset,
576 jeb->offset + ofs));
David Woodhousea6a8bef2006-05-29 00:41:11 +0100577 if ((err = jffs2_prealloc_raw_node_refs(c, jeb, 1)))
578 return err;
David Woodhouse68270992006-05-21 03:46:05 +0100579 if ((err = jffs2_scan_dirty_space(c, jeb, ofs)))
580 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 }
582
583 /* Now ofs is a complete physical flash offset as it always was... */
584 ofs += jeb->offset;
585
586 noise = 10;
587
Artem B. Bityutskiy733802d2005-09-22 12:25:00 +0100588 dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100589
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000590scan_more:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 while(ofs < jeb->offset + c->sector_size) {
592
Artem B. Bityutskiye0c8e422005-07-24 16:14:17 +0100593 jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
David Woodhouse2f785402006-05-24 02:04:45 +0100595 /* Make sure there are node refs available for use */
David Woodhouse046b8b92006-05-25 01:50:35 +0100596 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
David Woodhouse2f785402006-05-24 02:04:45 +0100597 if (err)
598 return err;
599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 cond_resched();
601
602 if (ofs & 3) {
603 printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs);
604 ofs = PAD(ofs);
605 continue;
606 }
607 if (ofs == prevofs) {
608 printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs);
David Woodhouse68270992006-05-21 03:46:05 +0100609 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
610 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 ofs += 4;
612 continue;
613 }
614 prevofs = ofs;
615
616 if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
617 D1(printk(KERN_DEBUG "Fewer than %zd bytes left to end of block. (%x+%x<%x+%zx) Not reading\n", sizeof(struct jffs2_unknown_node),
618 jeb->offset, c->sector_size, ofs, sizeof(*node)));
David Woodhouse68270992006-05-21 03:46:05 +0100619 if ((err = jffs2_scan_dirty_space(c, jeb, (jeb->offset + c->sector_size)-ofs)))
620 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 break;
622 }
623
624 if (buf_ofs + buf_len < ofs + sizeof(*node)) {
625 buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
626 D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
627 sizeof(struct jffs2_unknown_node), buf_len, ofs));
628 err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
629 if (err)
630 return err;
631 buf_ofs = ofs;
632 }
633
634 node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
635
636 if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
637 uint32_t inbuf_ofs;
Joakim Tjernlundc2aecda2007-03-27 13:32:09 +0200638 uint32_t empty_start, scan_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 empty_start = ofs;
641 ofs += 4;
Joakim Tjernlundc2aecda2007-03-27 13:32:09 +0200642 scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
644 D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs));
645 more_empty:
646 inbuf_ofs = ofs - buf_ofs;
Joakim Tjernlundc2aecda2007-03-27 13:32:09 +0200647 while (inbuf_ofs < scan_end) {
648 if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n",
650 empty_start, ofs);
David Woodhouse68270992006-05-21 03:46:05 +0100651 if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start)))
652 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 goto scan_more;
654 }
655
656 inbuf_ofs+=4;
657 ofs += 4;
658 }
659 /* Ran off end. */
660 D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs));
661
662 /* If we're only checking the beginning of a block with a cleanmarker,
663 bail now */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000664 if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
David Woodhouse99988f72006-05-24 09:04:17 +0100665 c->cleanmarker_size && !jeb->dirty_size && !ref_next(jeb->first_node)) {
Andrew Victor3be36672005-02-09 09:09:05 +0000666 D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 return BLK_STATE_CLEANMARKER;
668 }
Joakim Tjernlundc2aecda2007-03-27 13:32:09 +0200669 if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */
670 scan_end = buf_len;
671 goto more_empty;
672 }
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 /* See how much more there is to read in this eraseblock... */
675 buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
676 if (!buf_len) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000677 /* No more to read. Break out of main loop without marking
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 this range of empty space as dirty (because it's not) */
679 D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n",
680 empty_start));
681 break;
682 }
Joakim Tjernlundc2aecda2007-03-27 13:32:09 +0200683 /* point never reaches here */
684 scan_end = buf_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs));
686 err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
687 if (err)
688 return err;
689 buf_ofs = ofs;
690 goto more_empty;
691 }
692
693 if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
694 printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs);
David Woodhouse68270992006-05-21 03:46:05 +0100695 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
696 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 ofs += 4;
698 continue;
699 }
700 if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
701 D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs));
David Woodhouse68270992006-05-21 03:46:05 +0100702 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
703 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 ofs += 4;
705 continue;
706 }
707 if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
708 printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs);
709 printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n");
David Woodhouse68270992006-05-21 03:46:05 +0100710 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
711 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 ofs += 4;
713 continue;
714 }
715 if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
716 /* OK. We're out of possibilities. Whinge and move on */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000717 noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
718 JFFS2_MAGIC_BITMASK, ofs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 je16_to_cpu(node->magic));
David Woodhouse68270992006-05-21 03:46:05 +0100720 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
721 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 ofs += 4;
723 continue;
724 }
725 /* We seem to have a node of sorts. Check the CRC */
726 crcnode.magic = node->magic;
727 crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
728 crcnode.totlen = node->totlen;
729 hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
730
731 if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
732 noisy_printk(&noise, "jffs2_scan_eraseblock(): Node at 0x%08x {0x%04x, 0x%04x, 0x%08x) has invalid CRC 0x%08x (calculated 0x%08x)\n",
733 ofs, je16_to_cpu(node->magic),
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000734 je16_to_cpu(node->nodetype),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 je32_to_cpu(node->totlen),
736 je32_to_cpu(node->hdr_crc),
737 hdr_crc);
David Woodhouse68270992006-05-21 03:46:05 +0100738 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
739 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 ofs += 4;
741 continue;
742 }
743
Joakim Tjernlund0dec4c82007-03-10 17:08:44 +0100744 if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 /* Eep. Node goes over the end of the erase block. */
746 printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
747 ofs, je32_to_cpu(node->totlen));
748 printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n");
David Woodhouse68270992006-05-21 03:46:05 +0100749 if ((err = jffs2_scan_dirty_space(c, jeb, 4)))
750 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 ofs += 4;
752 continue;
753 }
754
755 if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
756 /* Wheee. This is an obsoleted node */
757 D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs));
David Woodhouse68270992006-05-21 03:46:05 +0100758 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
759 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 ofs += PAD(je32_to_cpu(node->totlen));
761 continue;
762 }
763
764 switch(je16_to_cpu(node->nodetype)) {
765 case JFFS2_NODETYPE_INODE:
766 if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
767 buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
768 D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
769 sizeof(struct jffs2_raw_inode), buf_len, ofs));
770 err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
771 if (err)
772 return err;
773 buf_ofs = ofs;
774 node = (void *)buf;
775 }
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100776 err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 if (err) return err;
778 ofs += PAD(je32_to_cpu(node->totlen));
779 break;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 case JFFS2_NODETYPE_DIRENT:
782 if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
783 buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
784 D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
785 je32_to_cpu(node->totlen), buf_len, ofs));
786 err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
787 if (err)
788 return err;
789 buf_ofs = ofs;
790 node = (void *)buf;
791 }
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100792 err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 if (err) return err;
794 ofs += PAD(je32_to_cpu(node->totlen));
795 break;
796
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900797#ifdef CONFIG_JFFS2_FS_XATTR
798 case JFFS2_NODETYPE_XATTR:
799 if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
800 buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
801 D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)"
802 " left to end of buf. Reading 0x%x at 0x%08x\n",
803 je32_to_cpu(node->totlen), buf_len, ofs));
804 err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
805 if (err)
806 return err;
807 buf_ofs = ofs;
808 node = (void *)buf;
809 }
810 err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
811 if (err)
812 return err;
813 ofs += PAD(je32_to_cpu(node->totlen));
814 break;
815 case JFFS2_NODETYPE_XREF:
816 if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
817 buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
818 D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)"
819 " left to end of buf. Reading 0x%x at 0x%08x\n",
820 je32_to_cpu(node->totlen), buf_len, ofs));
821 err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
822 if (err)
823 return err;
824 buf_ofs = ofs;
825 node = (void *)buf;
826 }
827 err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
828 if (err)
829 return err;
830 ofs += PAD(je32_to_cpu(node->totlen));
831 break;
832#endif /* CONFIG_JFFS2_FS_XATTR */
833
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 case JFFS2_NODETYPE_CLEANMARKER:
835 D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs));
836 if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000837 printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 ofs, je32_to_cpu(node->totlen), c->cleanmarker_size);
David Woodhouse68270992006-05-21 03:46:05 +0100839 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
840 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 ofs += PAD(sizeof(struct jffs2_unknown_node));
842 } else if (jeb->first_node) {
843 printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset);
David Woodhouse68270992006-05-21 03:46:05 +0100844 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(sizeof(struct jffs2_unknown_node)))))
845 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 ofs += PAD(sizeof(struct jffs2_unknown_node));
847 } else {
David Woodhouse2f785402006-05-24 02:04:45 +0100848 jffs2_link_node_ref(c, jeb, ofs | REF_NORMAL, c->cleanmarker_size, NULL);
David Woodhousef1f96712006-05-20 19:45:26 +0100849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 ofs += PAD(c->cleanmarker_size);
851 }
852 break;
853
854 case JFFS2_NODETYPE_PADDING:
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100855 if (jffs2_sum_active())
856 jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
David Woodhouse68270992006-05-21 03:46:05 +0100857 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
858 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 ofs += PAD(je32_to_cpu(node->totlen));
860 break;
861
862 default:
863 switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
864 case JFFS2_FEATURE_ROCOMPAT:
865 printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
866 c->flags |= JFFS2_SB_FLAG_RO;
867 if (!(jffs2_is_readonly(c)))
868 return -EROFS;
David Woodhouse68270992006-05-21 03:46:05 +0100869 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
870 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 ofs += PAD(je32_to_cpu(node->totlen));
872 break;
873
874 case JFFS2_FEATURE_INCOMPAT:
875 printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
876 return -EINVAL;
877
878 case JFFS2_FEATURE_RWCOMPAT_DELETE:
879 D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
David Woodhouse68270992006-05-21 03:46:05 +0100880 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(node->totlen)))))
881 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 ofs += PAD(je32_to_cpu(node->totlen));
883 break;
884
David Woodhouse61715862006-05-21 00:02:06 +0100885 case JFFS2_FEATURE_RWCOMPAT_COPY: {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
David Woodhouse61715862006-05-21 00:02:06 +0100887
David Woodhouse2f785402006-05-24 02:04:45 +0100888 jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(node->totlen)), NULL);
David Woodhouse61715862006-05-21 00:02:06 +0100889
890 /* We can't summarise nodes we don't grok */
891 jffs2_sum_disable_collecting(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 ofs += PAD(je32_to_cpu(node->totlen));
893 break;
David Woodhouse61715862006-05-21 00:02:06 +0100894 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 }
896 }
897 }
898
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100899 if (jffs2_sum_active()) {
900 if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
Artem B. Bityutskiy733802d2005-09-22 12:25:00 +0100901 dbg_summary("There is not enough space for "
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100902 "summary information, disabling for this jeb!\n");
903 jffs2_sum_disable_collecting(s);
904 }
905 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
David Woodhouse8b9e9fe2006-05-25 01:53:09 +0100907 D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x, wasted 0x%08x\n",
908 jeb->offset,jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size, jeb->wasted_size));
909
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 /* mark_node_obsolete can add to wasted !! */
911 if (jeb->wasted_size) {
912 jeb->dirty_size += jeb->wasted_size;
913 c->dirty_size += jeb->wasted_size;
914 c->wasted_size -= jeb->wasted_size;
915 jeb->wasted_size = 0;
916 }
917
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100918 return jffs2_scan_classify_jeb(c, jeb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919}
920
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100921struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
923 struct jffs2_inode_cache *ic;
924
925 ic = jffs2_get_ino_cache(c, ino);
926 if (ic)
927 return ic;
928
929 if (ino > c->highest_ino)
930 c->highest_ino = ino;
931
932 ic = jffs2_alloc_inode_cache();
933 if (!ic) {
934 printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n");
935 return NULL;
936 }
937 memset(ic, 0, sizeof(*ic));
938
939 ic->ino = ino;
940 ic->nodes = (void *)ic;
941 jffs2_add_ino_cache(c, ic);
942 if (ino == 1)
943 ic->nlink = 1;
944 return ic;
945}
946
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000947static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100948 struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 struct jffs2_inode_cache *ic;
Thomas Gleixner53043002007-04-05 11:09:01 +0200951 uint32_t crc, ino = je32_to_cpu(ri->ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
953 D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs));
954
955 /* We do very little here now. Just check the ino# to which we should attribute
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000956 this node; we can do all the CRC checking etc. later. There's a tradeoff here --
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 we used to scan the flash once only, reading everything we want from it into
958 memory, then building all our in-core data structures and freeing the extra
959 information. Now we allow the first part of the mount to complete a lot quicker,
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000960 but we have to go _back_ to the flash in order to finish the CRC checking, etc.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 Which means that the _full_ amount of time to get to proper write mode with GC
962 operational may actually be _longer_ than before. Sucks to be me. */
963
Thomas Gleixner53043002007-04-05 11:09:01 +0200964 /* Check the node CRC in any case. */
965 crc = crc32(0, ri, sizeof(*ri)-8);
966 if (crc != je32_to_cpu(ri->node_crc)) {
967 printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on "
968 "node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
969 ofs, je32_to_cpu(ri->node_crc), crc);
970 /*
971 * We believe totlen because the CRC on the node
972 * _header_ was OK, just the node itself failed.
973 */
974 return jffs2_scan_dirty_space(c, jeb,
975 PAD(je32_to_cpu(ri->totlen)));
976 }
977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 ic = jffs2_get_ino_cache(c, ino);
979 if (!ic) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 ic = jffs2_scan_make_ino_cache(c, ino);
David Woodhouse2f785402006-05-24 02:04:45 +0100981 if (!ic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 }
984
985 /* Wheee. It worked */
David Woodhouse2f785402006-05-24 02:04:45 +0100986 jffs2_link_node_ref(c, jeb, ofs | REF_UNCHECKED, PAD(je32_to_cpu(ri->totlen)), ic);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000988 D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 je32_to_cpu(ri->ino), je32_to_cpu(ri->version),
990 je32_to_cpu(ri->offset),
991 je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize)));
992
993 pseudo_random += je32_to_cpu(ri->version);
994
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100995 if (jffs2_sum_active()) {
996 jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset);
997 }
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 return 0;
1000}
1001
Thomas Gleixner182ec4e2005-11-07 11:16:07 +00001002static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
Ferenc Havasie631ddb2005-09-07 09:35:26 +01001003 struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 struct jffs2_full_dirent *fd;
1006 struct jffs2_inode_cache *ic;
1007 uint32_t crc;
David Woodhouse68270992006-05-21 03:46:05 +01001008 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
1010 D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs));
1011
1012 /* We don't get here unless the node is still valid, so we don't have to
1013 mask in the ACCURATE bit any more. */
1014 crc = crc32(0, rd, sizeof(*rd)-8);
1015
1016 if (crc != je32_to_cpu(rd->node_crc)) {
1017 printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
1018 ofs, je32_to_cpu(rd->node_crc), crc);
1019 /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */
David Woodhouse68270992006-05-21 03:46:05 +01001020 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen)))))
1021 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 return 0;
1023 }
1024
1025 pseudo_random += je32_to_cpu(rd->version);
1026
1027 fd = jffs2_alloc_full_dirent(rd->nsize+1);
1028 if (!fd) {
1029 return -ENOMEM;
1030 }
1031 memcpy(&fd->name, rd->name, rd->nsize);
1032 fd->name[rd->nsize] = 0;
1033
1034 crc = crc32(0, fd->name, rd->nsize);
1035 if (crc != je32_to_cpu(rd->name_crc)) {
1036 printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
Thomas Gleixner182ec4e2005-11-07 11:16:07 +00001037 ofs, je32_to_cpu(rd->name_crc), crc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino)));
1039 jffs2_free_full_dirent(fd);
1040 /* FIXME: Why do we believe totlen? */
1041 /* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */
David Woodhouse68270992006-05-21 03:46:05 +01001042 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rd->totlen)))))
1043 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 return 0;
1045 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino));
1047 if (!ic) {
1048 jffs2_free_full_dirent(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 return -ENOMEM;
1050 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +00001051
David Woodhouse2f785402006-05-24 02:04:45 +01001052 fd->raw = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rd->totlen)), ic);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 fd->next = NULL;
1055 fd->version = je32_to_cpu(rd->version);
1056 fd->ino = je32_to_cpu(rd->ino);
1057 fd->nhash = full_name_hash(fd->name, rd->nsize);
1058 fd->type = rd->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
1060
Ferenc Havasie631ddb2005-09-07 09:35:26 +01001061 if (jffs2_sum_active()) {
1062 jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset);
1063 }
1064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 return 0;
1066}
1067
1068static int count_list(struct list_head *l)
1069{
1070 uint32_t count = 0;
1071 struct list_head *tmp;
1072
1073 list_for_each(tmp, l) {
1074 count++;
1075 }
1076 return count;
1077}
1078
1079/* Note: This breaks if list_empty(head). I don't care. You
1080 might, if you copy this code and use it elsewhere :) */
1081static void rotate_list(struct list_head *head, uint32_t count)
1082{
1083 struct list_head *n = head->next;
1084
1085 list_del(head);
1086 while(count--) {
1087 n = n->next;
1088 }
1089 list_add(head, n);
1090}
1091
1092void jffs2_rotate_lists(struct jffs2_sb_info *c)
1093{
1094 uint32_t x;
1095 uint32_t rotateby;
1096
1097 x = count_list(&c->clean_list);
1098 if (x) {
1099 rotateby = pseudo_random % x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 rotate_list((&c->clean_list), rotateby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 }
1102
1103 x = count_list(&c->very_dirty_list);
1104 if (x) {
1105 rotateby = pseudo_random % x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 rotate_list((&c->very_dirty_list), rotateby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 }
1108
1109 x = count_list(&c->dirty_list);
1110 if (x) {
1111 rotateby = pseudo_random % x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 rotate_list((&c->dirty_list), rotateby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 }
1114
1115 x = count_list(&c->erasable_list);
1116 if (x) {
1117 rotateby = pseudo_random % x;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 rotate_list((&c->erasable_list), rotateby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 }
1120
1121 if (c->nr_erasing_blocks) {
1122 rotateby = pseudo_random % c->nr_erasing_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 rotate_list((&c->erase_pending_list), rotateby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 }
1125
1126 if (c->nr_free_blocks) {
1127 rotateby = pseudo_random % c->nr_free_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 rotate_list((&c->free_list), rotateby);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 }
1130}