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kernel_optimize_test/fs/jffs2/scan.c
KaiGai Kohei aa98d7cf59 [JFFS2][XATTR] XATTR support on JFFS2 (version. 5) 
This attached patches provide xattr support including POSIX-ACL and
SELinux support on JFFS2 (version.5).

There are some significant differences from previous version posted
at last December.
The biggest change is addition of EBS(Erase Block Summary) support.
Currently, both kernel and usermode utility (sumtool) can recognize
xattr nodes which have JFFS2_NODETYPE_XATTR/_XREF nodetype.

In addition, some bugs are fixed.
- A potential race condition was fixed.
- Unexpected fail when updating a xattr by same name/value pair was fixed.
- A bug when removing xattr name/value pair was fixed.

The fundamental structures (such as using two new nodetypes and exclusion
mechanism by rwsem) are unchanged. But most of implementation were reviewed
and updated if necessary.
Espacially, we had to change several internal implementations related to
load_xattr_datum() to avoid a potential race condition.

[1/2] xattr_on_jffs2.kernel.version-5.patch
[2/2] xattr_on_jffs2.utils.version-5.patch

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-13 15:09:47 +09:00

1119 lines
34 KiB
C
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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001-2003 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: scan.c,v 1.125 2005/09/30 13:59:13 dedekind Exp $
*
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/pagemap.h>
#include <linux/crc32.h>
#include <linux/compiler.h>
#include "nodelist.h"
#include "summary.h"
#include "debug.h"
#define DEFAULT_EMPTY_SCAN_SIZE 1024
#define noisy_printk(noise, args...) do { \
if (*(noise)) { \
printk(KERN_NOTICE args); \
(*(noise))--; \
if (!(*(noise))) { \
printk(KERN_NOTICE "Further such events for this erase block will not be printed\n"); \
} \
} \
} while(0)
static uint32_t pseudo_random;
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s);
/* These helper functions _must_ increase ofs and also do the dirty/used space accounting.
* Returning an error will abort the mount - bad checksums etc. should just mark the space
* as dirty.
*/
static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s);
static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s);
static inline int min_free(struct jffs2_sb_info *c)
{
uint32_t min = 2 * sizeof(struct jffs2_raw_inode);
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (!jffs2_can_mark_obsolete(c) && min < c->wbuf_pagesize)
return c->wbuf_pagesize;
#endif
return min;
}
static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) {
if (sector_size < DEFAULT_EMPTY_SCAN_SIZE)
return sector_size;
else
return DEFAULT_EMPTY_SCAN_SIZE;
}
int jffs2_scan_medium(struct jffs2_sb_info *c)
{
int i, ret;
uint32_t empty_blocks = 0, bad_blocks = 0;
unsigned char *flashbuf = NULL;
uint32_t buf_size = 0;
struct jffs2_summary *s = NULL; /* summary info collected by the scan process */
#ifndef __ECOS
size_t pointlen;
if (c->mtd->point) {
ret = c->mtd->point (c->mtd, 0, c->mtd->size, &pointlen, &flashbuf);
if (!ret && pointlen < c->mtd->size) {
/* Don't muck about if it won't let us point to the whole flash */
D1(printk(KERN_DEBUG "MTD point returned len too short: 0x%zx\n", pointlen));
c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size);
flashbuf = NULL;
}
if (ret)
D1(printk(KERN_DEBUG "MTD point failed %d\n", ret));
}
#endif
if (!flashbuf) {
/* For NAND it's quicker to read a whole eraseblock at a time,
apparently */
if (jffs2_cleanmarker_oob(c))
buf_size = c->sector_size;
else
buf_size = PAGE_SIZE;
/* Respect kmalloc limitations */
if (buf_size > 128*1024)
buf_size = 128*1024;
D1(printk(KERN_DEBUG "Allocating readbuf of %d bytes\n", buf_size));
flashbuf = kmalloc(buf_size, GFP_KERNEL);
if (!flashbuf)
return -ENOMEM;
}
if (jffs2_sum_active()) {
s = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
if (!s) {
JFFS2_WARNING("Can't allocate memory for summary\n");
return -ENOMEM;
}
memset(s, 0, sizeof(struct jffs2_summary));
}
for (i=0; i<c->nr_blocks; i++) {
struct jffs2_eraseblock *jeb = &c->blocks[i];
/* reset summary info for next eraseblock scan */
jffs2_sum_reset_collected(s);
ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
buf_size, s);
if (ret < 0)
goto out;
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
/* Now decide which list to put it on */
switch(ret) {
case BLK_STATE_ALLFF:
/*
* Empty block. Since we can't be sure it
* was entirely erased, we just queue it for erase
* again. It will be marked as such when the erase
* is complete. Meanwhile we still count it as empty
* for later checks.
*/
empty_blocks++;
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_CLEANMARKER:
/* Only a CLEANMARKER node is valid */
if (!jeb->dirty_size) {
/* It's actually free */
list_add(&jeb->list, &c->free_list);
c->nr_free_blocks++;
} else {
/* Dirt */
D1(printk(KERN_DEBUG "Adding all-dirty block at 0x%08x to erase_pending_list\n", jeb->offset));
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
}
break;
case BLK_STATE_CLEAN:
/* Full (or almost full) of clean data. Clean list */
list_add(&jeb->list, &c->clean_list);
break;
case BLK_STATE_PARTDIRTY:
/* Some data, but not full. Dirty list. */
/* We want to remember the block with most free space
and stick it in the 'nextblock' position to start writing to it. */
if (jeb->free_size > min_free(c) &&
(!c->nextblock || c->nextblock->free_size < jeb->free_size)) {
/* Better candidate for the next writes to go to */
if (c->nextblock) {
c->nextblock->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size;
c->dirty_size += c->nextblock->free_size + c->nextblock->wasted_size;
c->free_size -= c->nextblock->free_size;
c->wasted_size -= c->nextblock->wasted_size;
c->nextblock->free_size = c->nextblock->wasted_size = 0;
if (VERYDIRTY(c, c->nextblock->dirty_size)) {
list_add(&c->nextblock->list, &c->very_dirty_list);
} else {
list_add(&c->nextblock->list, &c->dirty_list);
}
/* deleting summary information of the old nextblock */
jffs2_sum_reset_collected(c->summary);
}
/* update collected summary infromation for the current nextblock */
jffs2_sum_move_collected(c, s);
D1(printk(KERN_DEBUG "jffs2_scan_medium(): new nextblock = 0x%08x\n", jeb->offset));
c->nextblock = jeb;
} else {
jeb->dirty_size += jeb->free_size + jeb->wasted_size;
c->dirty_size += jeb->free_size + jeb->wasted_size;
c->free_size -= jeb->free_size;
c->wasted_size -= jeb->wasted_size;
jeb->free_size = jeb->wasted_size = 0;
if (VERYDIRTY(c, jeb->dirty_size)) {
list_add(&jeb->list, &c->very_dirty_list);
} else {
list_add(&jeb->list, &c->dirty_list);
}
}
break;
case BLK_STATE_ALLDIRTY:
/* Nothing valid - not even a clean marker. Needs erasing. */
/* For now we just put it on the erasing list. We'll start the erases later */
D1(printk(KERN_NOTICE "JFFS2: Erase block at 0x%08x is not formatted. It will be erased\n", jeb->offset));
list_add(&jeb->list, &c->erase_pending_list);
c->nr_erasing_blocks++;
break;
case BLK_STATE_BADBLOCK:
D1(printk(KERN_NOTICE "JFFS2: Block at 0x%08x is bad\n", jeb->offset));
list_add(&jeb->list, &c->bad_list);
c->bad_size += c->sector_size;
c->free_size -= c->sector_size;
bad_blocks++;
break;
default:
printk(KERN_WARNING "jffs2_scan_medium(): unknown block state\n");
BUG();
}
}
if (jffs2_sum_active() && s)
kfree(s);
/* Nextblock dirty is always seen as wasted, because we cannot recycle it now */
if (c->nextblock && (c->nextblock->dirty_size)) {
c->nextblock->wasted_size += c->nextblock->dirty_size;
c->wasted_size += c->nextblock->dirty_size;
c->dirty_size -= c->nextblock->dirty_size;
c->nextblock->dirty_size = 0;
}
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (!jffs2_can_mark_obsolete(c) && c->wbuf_pagesize && c->nextblock && (c->nextblock->free_size % c->wbuf_pagesize)) {
/* If we're going to start writing into a block which already
contains data, and the end of the data isn't page-aligned,
skip a little and align it. */
uint32_t skip = c->nextblock->free_size % c->wbuf_pagesize;
D1(printk(KERN_DEBUG "jffs2_scan_medium(): Skipping %d bytes in nextblock to ensure page alignment\n",
skip));
c->nextblock->wasted_size += skip;
c->wasted_size += skip;
c->nextblock->free_size -= skip;
c->free_size -= skip;
}
#endif
if (c->nr_erasing_blocks) {
if ( !c->used_size && ((c->nr_free_blocks+empty_blocks+bad_blocks)!= c->nr_blocks || bad_blocks == c->nr_blocks) ) {
printk(KERN_NOTICE "Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes\n");
printk(KERN_NOTICE "empty_blocks %d, bad_blocks %d, c->nr_blocks %d\n",empty_blocks,bad_blocks,c->nr_blocks);
ret = -EIO;
goto out;
}
jffs2_erase_pending_trigger(c);
}
ret = 0;
out:
if (buf_size)
kfree(flashbuf);
#ifndef __ECOS
else
c->mtd->unpoint(c->mtd, flashbuf, 0, c->mtd->size);
#endif
return ret;
}
int jffs2_fill_scan_buf (struct jffs2_sb_info *c, void *buf,
uint32_t ofs, uint32_t len)
{
int ret;
size_t retlen;
ret = jffs2_flash_read(c, ofs, len, &retlen, buf);
if (ret) {
D1(printk(KERN_WARNING "mtd->read(0x%x bytes from 0x%x) returned %d\n", len, ofs, ret));
return ret;
}
if (retlen < len) {
D1(printk(KERN_WARNING "Read at 0x%x gave only 0x%zx bytes\n", ofs, retlen));
return -EIO;
}
return 0;
}
int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{
if ((jeb->used_size + jeb->unchecked_size) == PAD(c->cleanmarker_size) && !jeb->dirty_size
&& (!jeb->first_node || !jeb->first_node->next_phys) )
return BLK_STATE_CLEANMARKER;
/* move blocks with max 4 byte dirty space to cleanlist */
else if (!ISDIRTY(c->sector_size - (jeb->used_size + jeb->unchecked_size))) {
c->dirty_size -= jeb->dirty_size;
c->wasted_size += jeb->dirty_size;
jeb->wasted_size += jeb->dirty_size;
jeb->dirty_size = 0;
return BLK_STATE_CLEAN;
} else if (jeb->used_size || jeb->unchecked_size)
return BLK_STATE_PARTDIRTY;
else
return BLK_STATE_ALLDIRTY;
}
#ifdef CONFIG_JFFS2_FS_XATTR
static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_xattr *rx, uint32_t ofs,
struct jffs2_summary *s)
{
struct jffs2_xattr_datum *xd;
struct jffs2_raw_node_ref *raw;
uint32_t totlen, crc;
crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4);
if (crc != je32_to_cpu(rx->node_crc)) {
if (je32_to_cpu(rx->node_crc) != 0xffffffff)
JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
ofs, je32_to_cpu(rx->node_crc), crc);
DIRTY_SPACE(je32_to_cpu(rx->totlen));
return 0;
}
totlen = PAD(sizeof(*rx) + rx->name_len + 1 + je16_to_cpu(rx->value_len));
if (totlen != je32_to_cpu(rx->totlen)) {
JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
ofs, je32_to_cpu(rx->totlen), totlen);
DIRTY_SPACE(je32_to_cpu(rx->totlen));
return 0;
}
raw = jffs2_alloc_raw_node_ref();
if (!raw)
return -ENOMEM;
xd = jffs2_setup_xattr_datum(c, je32_to_cpu(rx->xid), je32_to_cpu(rx->version));
if (IS_ERR(xd)) {
jffs2_free_raw_node_ref(raw);
if (PTR_ERR(xd) == -EEXIST) {
DIRTY_SPACE(PAD(je32_to_cpu(rx->totlen)));
return 0;
}
return PTR_ERR(xd);
}
xd->xprefix = rx->xprefix;
xd->name_len = rx->name_len;
xd->value_len = je16_to_cpu(rx->value_len);
xd->data_crc = je32_to_cpu(rx->data_crc);
xd->node = raw;
raw->__totlen = totlen;
raw->flash_offset = ofs | REF_PRISTINE;
raw->next_phys = NULL;
raw->next_in_ino = (void *)xd;
if (!jeb->first_node)
jeb->first_node = raw;
if (jeb->last_node)
jeb->last_node->next_phys = raw;
jeb->last_node = raw;
USED_SPACE(PAD(je32_to_cpu(rx->totlen)));
if (jffs2_sum_active())
jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset);
dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n",
ofs, xd->xid, xd->version);
return 0;
}
static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_xref *rr, uint32_t ofs,
struct jffs2_summary *s)
{
struct jffs2_xattr_ref *ref;
struct jffs2_raw_node_ref *raw;
uint32_t crc;
crc = crc32(0, rr, sizeof(*rr) - 4);
if (crc != je32_to_cpu(rr->node_crc)) {
if (je32_to_cpu(rr->node_crc) != 0xffffffff)
JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
ofs, je32_to_cpu(rr->node_crc), crc);
DIRTY_SPACE(PAD(je32_to_cpu(rr->totlen)));
return 0;
}
if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) {
JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
ofs, je32_to_cpu(rr->totlen),
PAD(sizeof(struct jffs2_raw_xref)));
DIRTY_SPACE(je32_to_cpu(rr->totlen));
return 0;
}
ref = jffs2_alloc_xattr_ref();
if (!ref)
return -ENOMEM;
raw = jffs2_alloc_raw_node_ref();
if (!raw) {
jffs2_free_xattr_ref(ref);
return -ENOMEM;
}
/* BEFORE jffs2_build_xattr_subsystem() called,
* ref->xid is used to store 32bit xid, xd is not used
* ref->ino is used to store 32bit inode-number, ic is not used
* Thoes variables are declared as union, thus using those
* are exclusive. In a similar way, ref->ilist is temporarily
* used to chain all xattr_ref object. It's re-chained to
* jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly.
*/
ref->node = raw;
ref->ino = je32_to_cpu(rr->ino);
ref->xid = je32_to_cpu(rr->xid);
list_add_tail(&ref->ilist, &c->xattr_temp);
raw->__totlen = PAD(je32_to_cpu(rr->totlen));
raw->flash_offset = ofs | REF_PRISTINE;
raw->next_phys = NULL;
raw->next_in_ino = (void *)ref;
if (!jeb->first_node)
jeb->first_node = raw;
if (jeb->last_node)
jeb->last_node->next_phys = raw;
jeb->last_node = raw;
USED_SPACE(PAD(je32_to_cpu(rr->totlen)));
if (jffs2_sum_active())
jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset);
dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n",
ofs, ref->xid, ref->ino);
return 0;
}
#endif
static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
unsigned char *buf, uint32_t buf_size, struct jffs2_summary *s) {
struct jffs2_unknown_node *node;
struct jffs2_unknown_node crcnode;
struct jffs2_sum_marker *sm;
uint32_t ofs, prevofs;
uint32_t hdr_crc, buf_ofs, buf_len;
int err;
int noise = 0;
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
int cleanmarkerfound = 0;
#endif
ofs = jeb->offset;
prevofs = jeb->offset - 1;
D1(printk(KERN_DEBUG "jffs2_scan_eraseblock(): Scanning block at 0x%x\n", ofs));
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
int ret = jffs2_check_nand_cleanmarker(c, jeb);
D2(printk(KERN_NOTICE "jffs_check_nand_cleanmarker returned %d\n",ret));
/* Even if it's not found, we still scan to see
if the block is empty. We use this information
to decide whether to erase it or not. */
switch (ret) {
case 0: cleanmarkerfound = 1; break;
case 1: break;
case 2: return BLK_STATE_BADBLOCK;
case 3: return BLK_STATE_ALLDIRTY; /* Block has failed to erase min. once */
default: return ret;
}
}
#endif
if (jffs2_sum_active()) {
sm = kmalloc(sizeof(struct jffs2_sum_marker), GFP_KERNEL);
if (!sm) {
return -ENOMEM;
}
err = jffs2_fill_scan_buf(c, (unsigned char *) sm, jeb->offset + c->sector_size -
sizeof(struct jffs2_sum_marker), sizeof(struct jffs2_sum_marker));
if (err) {
kfree(sm);
return err;
}
if (je32_to_cpu(sm->magic) == JFFS2_SUM_MAGIC ) {
err = jffs2_sum_scan_sumnode(c, jeb, je32_to_cpu(sm->offset), &pseudo_random);
if (err) {
kfree(sm);
return err;
}
}
kfree(sm);
ofs = jeb->offset;
prevofs = jeb->offset - 1;
}
buf_ofs = jeb->offset;
if (!buf_size) {
buf_len = c->sector_size;
if (jffs2_sum_active()) {
/* must reread because of summary test */
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
} else {
buf_len = EMPTY_SCAN_SIZE(c->sector_size);
err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
if (err)
return err;
}
/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
ofs = 0;
/* Scan only 4KiB of 0xFF before declaring it's empty */
while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
ofs += 4;
if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) {
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
if (jffs2_cleanmarker_oob(c)) {
/* scan oob, take care of cleanmarker */
int ret = jffs2_check_oob_empty(c, jeb, cleanmarkerfound);
D2(printk(KERN_NOTICE "jffs2_check_oob_empty returned %d\n",ret));
switch (ret) {
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
case 1: return BLK_STATE_ALLDIRTY;
default: return ret;
}
}
#endif
D1(printk(KERN_DEBUG "Block at 0x%08x is empty (erased)\n", jeb->offset));
if (c->cleanmarker_size == 0)
return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */
else
return BLK_STATE_ALLFF; /* OK to erase if all blocks are like this */
}
if (ofs) {
D1(printk(KERN_DEBUG "Free space at %08x ends at %08x\n", jeb->offset,
jeb->offset + ofs));
DIRTY_SPACE(ofs);
}
/* Now ofs is a complete physical flash offset as it always was... */
ofs += jeb->offset;
noise = 10;
dbg_summary("no summary found in jeb 0x%08x. Apply original scan.\n",jeb->offset);
scan_more:
while(ofs < jeb->offset + c->sector_size) {
jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
cond_resched();
if (ofs & 3) {
printk(KERN_WARNING "Eep. ofs 0x%08x not word-aligned!\n", ofs);
ofs = PAD(ofs);
continue;
}
if (ofs == prevofs) {
printk(KERN_WARNING "ofs 0x%08x has already been seen. Skipping\n", ofs);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
prevofs = ofs;
if (jeb->offset + c->sector_size < ofs + sizeof(*node)) {
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),
jeb->offset, c->sector_size, ofs, sizeof(*node)));
DIRTY_SPACE((jeb->offset + c->sector_size)-ofs);
break;
}
if (buf_ofs + buf_len < ofs + sizeof(*node)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (node header) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_unknown_node), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
}
node = (struct jffs2_unknown_node *)&buf[ofs-buf_ofs];
if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) {
uint32_t inbuf_ofs;
uint32_t empty_start;
empty_start = ofs;
ofs += 4;
D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs));
more_empty:
inbuf_ofs = ofs - buf_ofs;
while (inbuf_ofs < buf_len) {
if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) {
printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n",
empty_start, ofs);
DIRTY_SPACE(ofs-empty_start);
goto scan_more;
}
inbuf_ofs+=4;
ofs += 4;
}
/* Ran off end. */
D1(printk(KERN_DEBUG "Empty flash to end of buffer at 0x%08x\n", ofs));
/* If we're only checking the beginning of a block with a cleanmarker,
bail now */
if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_phys) {
D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
return BLK_STATE_CLEANMARKER;
}
/* See how much more there is to read in this eraseblock... */
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
if (!buf_len) {
/* No more to read. Break out of main loop without marking
this range of empty space as dirty (because it's not) */
D1(printk(KERN_DEBUG "Empty flash at %08x runs to end of block. Treating as free_space\n",
empty_start));
break;
}
D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
goto more_empty;
}
if (ofs == jeb->offset && je16_to_cpu(node->magic) == KSAMTIB_CIGAM_2SFFJ) {
printk(KERN_WARNING "Magic bitmask is backwards at offset 0x%08x. Wrong endian filesystem?\n", ofs);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_DIRTY_BITMASK) {
D1(printk(KERN_DEBUG "Dirty bitmask at 0x%08x\n", ofs));
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) == JFFS2_OLD_MAGIC_BITMASK) {
printk(KERN_WARNING "Old JFFS2 bitmask found at 0x%08x\n", ofs);
printk(KERN_WARNING "You cannot use older JFFS2 filesystems with newer kernels\n");
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (je16_to_cpu(node->magic) != JFFS2_MAGIC_BITMASK) {
/* OK. We're out of possibilities. Whinge and move on */
noisy_printk(&noise, "jffs2_scan_eraseblock(): Magic bitmask 0x%04x not found at 0x%08x: 0x%04x instead\n",
JFFS2_MAGIC_BITMASK, ofs,
je16_to_cpu(node->magic));
DIRTY_SPACE(4);
ofs += 4;
continue;
}
/* We seem to have a node of sorts. Check the CRC */
crcnode.magic = node->magic;
crcnode.nodetype = cpu_to_je16( je16_to_cpu(node->nodetype) | JFFS2_NODE_ACCURATE);
crcnode.totlen = node->totlen;
hdr_crc = crc32(0, &crcnode, sizeof(crcnode)-4);
if (hdr_crc != je32_to_cpu(node->hdr_crc)) {
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",
ofs, je16_to_cpu(node->magic),
je16_to_cpu(node->nodetype),
je32_to_cpu(node->totlen),
je32_to_cpu(node->hdr_crc),
hdr_crc);
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (ofs + je32_to_cpu(node->totlen) >
jeb->offset + c->sector_size) {
/* Eep. Node goes over the end of the erase block. */
printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n",
ofs, je32_to_cpu(node->totlen));
printk(KERN_WARNING "Perhaps the file system was created with the wrong erase size?\n");
DIRTY_SPACE(4);
ofs += 4;
continue;
}
if (!(je16_to_cpu(node->nodetype) & JFFS2_NODE_ACCURATE)) {
/* Wheee. This is an obsoleted node */
D2(printk(KERN_DEBUG "Node at 0x%08x is obsolete. Skipping\n", ofs));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
continue;
}
switch(je16_to_cpu(node->nodetype)) {
case JFFS2_NODETYPE_INODE:
if (buf_ofs + buf_len < ofs + sizeof(struct jffs2_raw_inode)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %zd bytes (inode node) left to end of buf. Reading 0x%x at 0x%08x\n",
sizeof(struct jffs2_raw_inode), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_inode_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_DIRENT:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (dirent node) left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_dirent_node(c, jeb, (void *)node, ofs, s);
if (err) return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (xattr node)"
" left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_xattr_node(c, jeb, (void *)node, ofs, s);
if (err)
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_NODETYPE_XREF:
if (buf_ofs + buf_len < ofs + je32_to_cpu(node->totlen)) {
buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs);
D1(printk(KERN_DEBUG "Fewer than %d bytes (xref node)"
" left to end of buf. Reading 0x%x at 0x%08x\n",
je32_to_cpu(node->totlen), buf_len, ofs));
err = jffs2_fill_scan_buf(c, buf, ofs, buf_len);
if (err)
return err;
buf_ofs = ofs;
node = (void *)buf;
}
err = jffs2_scan_xref_node(c, jeb, (void *)node, ofs, s);
if (err)
return err;
ofs += PAD(je32_to_cpu(node->totlen));
break;
#endif /* CONFIG_JFFS2_FS_XATTR */
case JFFS2_NODETYPE_CLEANMARKER:
D1(printk(KERN_DEBUG "CLEANMARKER node found at 0x%08x\n", ofs));
if (je32_to_cpu(node->totlen) != c->cleanmarker_size) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x has totlen 0x%x != normal 0x%x\n",
ofs, je32_to_cpu(node->totlen), c->cleanmarker_size);
DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node)));
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else if (jeb->first_node) {
printk(KERN_NOTICE "CLEANMARKER node found at 0x%08x, not first node in block (0x%08x)\n", ofs, jeb->offset);
DIRTY_SPACE(PAD(sizeof(struct jffs2_unknown_node)));
ofs += PAD(sizeof(struct jffs2_unknown_node));
} else {
struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
if (!marker_ref) {
printk(KERN_NOTICE "Failed to allocate node ref for clean marker\n");
return -ENOMEM;
}
marker_ref->next_in_ino = NULL;
marker_ref->next_phys = NULL;
marker_ref->flash_offset = ofs | REF_NORMAL;
marker_ref->__totlen = c->cleanmarker_size;
jeb->first_node = jeb->last_node = marker_ref;
USED_SPACE(PAD(c->cleanmarker_size));
ofs += PAD(c->cleanmarker_size);
}
break;
case JFFS2_NODETYPE_PADDING:
if (jffs2_sum_active())
jffs2_sum_add_padding_mem(s, je32_to_cpu(node->totlen));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
default:
switch (je16_to_cpu(node->nodetype) & JFFS2_COMPAT_MASK) {
case JFFS2_FEATURE_ROCOMPAT:
printk(KERN_NOTICE "Read-only compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
c->flags |= JFFS2_SB_FLAG_RO;
if (!(jffs2_is_readonly(c)))
return -EROFS;
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_INCOMPAT:
printk(KERN_NOTICE "Incompatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs);
return -EINVAL;
case JFFS2_FEATURE_RWCOMPAT_DELETE:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
DIRTY_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_RWCOMPAT_COPY:
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
USED_SPACE(PAD(je32_to_cpu(node->totlen)));
ofs += PAD(je32_to_cpu(node->totlen));
break;
}
}
}
if (jffs2_sum_active()) {
if (PAD(s->sum_size + JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size) {
dbg_summary("There is not enough space for "
"summary information, disabling for this jeb!\n");
jffs2_sum_disable_collecting(s);
}
}
D1(printk(KERN_DEBUG "Block at 0x%08x: free 0x%08x, dirty 0x%08x, unchecked 0x%08x, used 0x%08x\n", jeb->offset,
jeb->free_size, jeb->dirty_size, jeb->unchecked_size, jeb->used_size));
/* mark_node_obsolete can add to wasted !! */
if (jeb->wasted_size) {
jeb->dirty_size += jeb->wasted_size;
c->dirty_size += jeb->wasted_size;
c->wasted_size -= jeb->wasted_size;
jeb->wasted_size = 0;
}
return jffs2_scan_classify_jeb(c, jeb);
}
struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino)
{
struct jffs2_inode_cache *ic;
ic = jffs2_get_ino_cache(c, ino);
if (ic)
return ic;
if (ino > c->highest_ino)
c->highest_ino = ino;
ic = jffs2_alloc_inode_cache();
if (!ic) {
printk(KERN_NOTICE "jffs2_scan_make_inode_cache(): allocation of inode cache failed\n");
return NULL;
}
memset(ic, 0, sizeof(*ic));
ic->ino = ino;
ic->nodes = (void *)ic;
init_xattr_inode_cache(ic);
jffs2_add_ino_cache(c, ic);
if (ino == 1)
ic->nlink = 1;
return ic;
}
static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s)
{
struct jffs2_raw_node_ref *raw;
struct jffs2_inode_cache *ic;
uint32_t ino = je32_to_cpu(ri->ino);
D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs));
/* We do very little here now. Just check the ino# to which we should attribute
this node; we can do all the CRC checking etc. later. There's a tradeoff here --
we used to scan the flash once only, reading everything we want from it into
memory, then building all our in-core data structures and freeing the extra
information. Now we allow the first part of the mount to complete a lot quicker,
but we have to go _back_ to the flash in order to finish the CRC checking, etc.
Which means that the _full_ amount of time to get to proper write mode with GC
operational may actually be _longer_ than before. Sucks to be me. */
raw = jffs2_alloc_raw_node_ref();
if (!raw) {
printk(KERN_NOTICE "jffs2_scan_inode_node(): allocation of node reference failed\n");
return -ENOMEM;
}
ic = jffs2_get_ino_cache(c, ino);
if (!ic) {
/* Inocache get failed. Either we read a bogus ino# or it's just genuinely the
first node we found for this inode. Do a CRC check to protect against the former
case */
uint32_t crc = crc32(0, ri, sizeof(*ri)-8);
if (crc != je32_to_cpu(ri->node_crc)) {
printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
ofs, je32_to_cpu(ri->node_crc), crc);
/* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */
DIRTY_SPACE(PAD(je32_to_cpu(ri->totlen)));
jffs2_free_raw_node_ref(raw);
return 0;
}
ic = jffs2_scan_make_ino_cache(c, ino);
if (!ic) {
jffs2_free_raw_node_ref(raw);
return -ENOMEM;
}
}
/* Wheee. It worked */
raw->flash_offset = ofs | REF_UNCHECKED;
raw->__totlen = PAD(je32_to_cpu(ri->totlen));
raw->next_phys = NULL;
raw->next_in_ino = ic->nodes;
ic->nodes = raw;
if (!jeb->first_node)
jeb->first_node = raw;
if (jeb->last_node)
jeb->last_node->next_phys = raw;
jeb->last_node = raw;
D1(printk(KERN_DEBUG "Node is ino #%u, version %d. Range 0x%x-0x%x\n",
je32_to_cpu(ri->ino), je32_to_cpu(ri->version),
je32_to_cpu(ri->offset),
je32_to_cpu(ri->offset)+je32_to_cpu(ri->dsize)));
pseudo_random += je32_to_cpu(ri->version);
UNCHECKED_SPACE(PAD(je32_to_cpu(ri->totlen)));
if (jffs2_sum_active()) {
jffs2_sum_add_inode_mem(s, ri, ofs - jeb->offset);
}
return 0;
}
static int jffs2_scan_dirent_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_dirent *rd, uint32_t ofs, struct jffs2_summary *s)
{
struct jffs2_raw_node_ref *raw;
struct jffs2_full_dirent *fd;
struct jffs2_inode_cache *ic;
uint32_t crc;
D1(printk(KERN_DEBUG "jffs2_scan_dirent_node(): Node at 0x%08x\n", ofs));
/* We don't get here unless the node is still valid, so we don't have to
mask in the ACCURATE bit any more. */
crc = crc32(0, rd, sizeof(*rd)-8);
if (crc != je32_to_cpu(rd->node_crc)) {
printk(KERN_NOTICE "jffs2_scan_dirent_node(): Node CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
ofs, je32_to_cpu(rd->node_crc), crc);
/* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */
DIRTY_SPACE(PAD(je32_to_cpu(rd->totlen)));
return 0;
}
pseudo_random += je32_to_cpu(rd->version);
fd = jffs2_alloc_full_dirent(rd->nsize+1);
if (!fd) {
return -ENOMEM;
}
memcpy(&fd->name, rd->name, rd->nsize);
fd->name[rd->nsize] = 0;
crc = crc32(0, fd->name, rd->nsize);
if (crc != je32_to_cpu(rd->name_crc)) {
printk(KERN_NOTICE "jffs2_scan_dirent_node(): Name CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
ofs, je32_to_cpu(rd->name_crc), crc);
D1(printk(KERN_NOTICE "Name for which CRC failed is (now) '%s', ino #%d\n", fd->name, je32_to_cpu(rd->ino)));
jffs2_free_full_dirent(fd);
/* FIXME: Why do we believe totlen? */
/* We believe totlen because the CRC on the node _header_ was OK, just the name failed. */
DIRTY_SPACE(PAD(je32_to_cpu(rd->totlen)));
return 0;
}
raw = jffs2_alloc_raw_node_ref();
if (!raw) {
jffs2_free_full_dirent(fd);
printk(KERN_NOTICE "jffs2_scan_dirent_node(): allocation of node reference failed\n");
return -ENOMEM;
}
ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(rd->pino));
if (!ic) {
jffs2_free_full_dirent(fd);
jffs2_free_raw_node_ref(raw);
return -ENOMEM;
}
raw->__totlen = PAD(je32_to_cpu(rd->totlen));
raw->flash_offset = ofs | REF_PRISTINE;
raw->next_phys = NULL;
raw->next_in_ino = ic->nodes;
ic->nodes = raw;
if (!jeb->first_node)
jeb->first_node = raw;
if (jeb->last_node)
jeb->last_node->next_phys = raw;
jeb->last_node = raw;
fd->raw = raw;
fd->next = NULL;
fd->version = je32_to_cpu(rd->version);
fd->ino = je32_to_cpu(rd->ino);
fd->nhash = full_name_hash(fd->name, rd->nsize);
fd->type = rd->type;
USED_SPACE(PAD(je32_to_cpu(rd->totlen)));
jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
if (jffs2_sum_active()) {
jffs2_sum_add_dirent_mem(s, rd, ofs - jeb->offset);
}
return 0;
}
static int count_list(struct list_head *l)
{
uint32_t count = 0;
struct list_head *tmp;
list_for_each(tmp, l) {
count++;
}
return count;
}
/* Note: This breaks if list_empty(head). I don't care. You
might, if you copy this code and use it elsewhere :) */
static void rotate_list(struct list_head *head, uint32_t count)
{
struct list_head *n = head->next;
list_del(head);
while(count--) {
n = n->next;
}
list_add(head, n);
}
void jffs2_rotate_lists(struct jffs2_sb_info *c)
{
uint32_t x;
uint32_t rotateby;
x = count_list(&c->clean_list);
if (x) {
rotateby = pseudo_random % x;
rotate_list((&c->clean_list), rotateby);
}
x = count_list(&c->very_dirty_list);
if (x) {
rotateby = pseudo_random % x;
rotate_list((&c->very_dirty_list), rotateby);
}
x = count_list(&c->dirty_list);
if (x) {
rotateby = pseudo_random % x;
rotate_list((&c->dirty_list), rotateby);
}
x = count_list(&c->erasable_list);
if (x) {
rotateby = pseudo_random % x;
rotate_list((&c->erasable_list), rotateby);
}
if (c->nr_erasing_blocks) {
rotateby = pseudo_random % c->nr_erasing_blocks;
rotate_list((&c->erase_pending_list), rotateby);
}
if (c->nr_free_blocks) {
rotateby = pseudo_random % c->nr_free_blocks;
rotate_list((&c->free_list), rotateby);
}
}
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