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android / kernel / common / 6aa2f9441f1ef21f10c41f45e6453b135e9cd736 / . / fs / jffs2 / summary.c
blob: be7c8a6a574806fd0d4189695083c15b65e5f492 [file] [log] [blame]
/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2004 Ferenc Havasi <[email protected]>,
* Zoltan Sogor <[email protected]>,
* Patrik Kluba <[email protected]>,
* University of Szeged, Hungary
* 2006 KaiGai Kohei <[email protected]>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/pagemap.h>
#include <linux/crc32.h>
#include <linux/compiler.h>
#include <linux/vmalloc.h>
#include "nodelist.h"
#include "debug.h"
int jffs2_sum_init(struct jffs2_sb_info *c)
{
uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
if (!c->summary) {
JFFS2_WARNING("Can't allocate memory for summary information!\n");
return -ENOMEM;
}
c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
if (!c->summary->sum_buf) {
JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
kfree(c->summary);
return -ENOMEM;
}
dbg_summary("returned successfully\n");
return 0;
}
void jffs2_sum_exit(struct jffs2_sb_info *c)
{
dbg_summary("called\n");
jffs2_sum_disable_collecting(c->summary);
kfree(c->summary->sum_buf);
c->summary->sum_buf = NULL;
kfree(c->summary);
c->summary = NULL;
}
static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
{
if (!s->sum_list_head)
s->sum_list_head = (union jffs2_sum_mem *) item;
if (s->sum_list_tail)
s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
s->sum_list_tail = (union jffs2_sum_mem *) item;
switch (je16_to_cpu(item->u.nodetype)) {
case JFFS2_NODETYPE_INODE:
s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
s->sum_num++;
dbg_summary("inode (%u) added to summary\n",
je32_to_cpu(item->i.inode));
break;
case JFFS2_NODETYPE_DIRENT:
s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
s->sum_num++;
dbg_summary("dirent (%u) added to summary\n",
je32_to_cpu(item->d.ino));
break;
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR:
s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
s->sum_num++;
dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
break;
case JFFS2_NODETYPE_XREF:
s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
s->sum_num++;
dbg_summary("xref added to summary\n");
break;
#endif
default:
JFFS2_WARNING("UNKNOWN node type %u\n",
je16_to_cpu(item->u.nodetype));
return 1;
}
return 0;
}
/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
{
dbg_summary("called with %u\n", size);
s->sum_padded += size;
return 0;
}
int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
uint32_t ofs)
{
struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
if (!temp)
return -ENOMEM;
temp->nodetype = ri->nodetype;
temp->inode = ri->ino;
temp->version = ri->version;
temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */
temp->totlen = ri->totlen;
temp->next = NULL;
return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
}
int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
uint32_t ofs)
{
struct jffs2_sum_dirent_mem *temp =
kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
if (!temp)
return -ENOMEM;
temp->nodetype = rd->nodetype;
temp->totlen = rd->totlen;
temp->offset = cpu_to_je32(ofs); /* relative from the beginning of the jeb */
temp->pino = rd->pino;
temp->version = rd->version;
temp->ino = rd->ino;
temp->nsize = rd->nsize;
temp->type = rd->type;
temp->next = NULL;
memcpy(temp->name, rd->name, rd->nsize);
return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
}
#ifdef CONFIG_JFFS2_FS_XATTR
int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
{
struct jffs2_sum_xattr_mem *temp;
temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
if (!temp)
return -ENOMEM;
temp->nodetype = rx->nodetype;
temp->xid = rx->xid;
temp->version = rx->version;
temp->offset = cpu_to_je32(ofs);
temp->totlen = rx->totlen;
temp->next = NULL;
return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
}
int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
{
struct jffs2_sum_xref_mem *temp;
temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
if (!temp)
return -ENOMEM;
temp->nodetype = rr->nodetype;
temp->offset = cpu_to_je32(ofs);
temp->next = NULL;
return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
}
#endif
/* Cleanup every collected summary information */
static void jffs2_sum_clean_collected(struct jffs2_summary *s)
{
union jffs2_sum_mem *temp;
if (!s->sum_list_head) {
dbg_summary("already empty\n");
}
while (s->sum_list_head) {
temp = s->sum_list_head;
s->sum_list_head = s->sum_list_head->u.next;
kfree(temp);
}
s->sum_list_tail = NULL;
s->sum_padded = 0;
s->sum_num = 0;
}
void jffs2_sum_reset_collected(struct jffs2_summary *s)
{
dbg_summary("called\n");
jffs2_sum_clean_collected(s);
s->sum_size = 0;
}
void jffs2_sum_disable_collecting(struct jffs2_summary *s)
{
dbg_summary("called\n");
jffs2_sum_clean_collected(s);
s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
}
int jffs2_sum_is_disabled(struct jffs2_summary *s)
{
return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
}
/* Move the collected summary information into sb (called from scan.c) */
void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
{
dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
c->summary->sum_size, c->summary->sum_num,
s->sum_size, s->sum_num);
c->summary->sum_size = s->sum_size;
c->summary->sum_num = s->sum_num;
c->summary->sum_padded = s->sum_padded;
c->summary->sum_list_head = s->sum_list_head;
c->summary->sum_list_tail = s->sum_list_tail;
s->sum_list_head = s->sum_list_tail = NULL;
}
/* Called from wbuf.c to collect writed node info */
int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
unsigned long count, uint32_t ofs)
{
union jffs2_node_union *node;
struct jffs2_eraseblock *jeb;
if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
return 0;
}
node = invecs[0].iov_base;
jeb = &c->blocks[ofs / c->sector_size];
ofs -= jeb->offset;
switch (je16_to_cpu(node->u.nodetype)) {
case JFFS2_NODETYPE_INODE: {
struct jffs2_sum_inode_mem *temp =
kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
if (!temp)
goto no_mem;
temp->nodetype = node->i.nodetype;
temp->inode = node->i.ino;
temp->version = node->i.version;
temp->offset = cpu_to_je32(ofs);
temp->totlen = node->i.totlen;
temp->next = NULL;
return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
}
case JFFS2_NODETYPE_DIRENT: {
struct jffs2_sum_dirent_mem *temp =
kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
if (!temp)
goto no_mem;
temp->nodetype = node->d.nodetype;
temp->totlen = node->d.totlen;
temp->offset = cpu_to_je32(ofs);
temp->pino = node->d.pino;
temp->version = node->d.version;
temp->ino = node->d.ino;
temp->nsize = node->d.nsize;
temp->type = node->d.type;
temp->next = NULL;
switch (count) {
case 1:
memcpy(temp->name,node->d.name,node->d.nsize);
break;
case 2:
memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
break;
default:
BUG(); /* impossible count value */
break;
}
return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
}
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR: {
struct jffs2_sum_xattr_mem *temp;
temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
if (!temp)
goto no_mem;
temp->nodetype = node->x.nodetype;
temp->xid = node->x.xid;
temp->version = node->x.version;
temp->totlen = node->x.totlen;
temp->offset = cpu_to_je32(ofs);
temp->next = NULL;
return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
}
case JFFS2_NODETYPE_XREF: {
struct jffs2_sum_xref_mem *temp;
temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
if (!temp)
goto no_mem;
temp->nodetype = node->r.nodetype;
temp->offset = cpu_to_je32(ofs);
temp->next = NULL;
return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
}
#endif
case JFFS2_NODETYPE_PADDING:
dbg_summary("node PADDING\n");
c->summary->sum_padded += je32_to_cpu(node->u.totlen);
break;
case JFFS2_NODETYPE_CLEANMARKER:
dbg_summary("node CLEANMARKER\n");
break;
case JFFS2_NODETYPE_SUMMARY:
dbg_summary("node SUMMARY\n");
break;
default:
/* If you implement a new node type you should also implement
summary support for it or disable summary.
*/
BUG();
break;
}
return 0;
no_mem:
JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
return -ENOMEM;
}
static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
struct jffs2_eraseblock *jeb,
uint32_t ofs, uint32_t len,
struct jffs2_inode_cache *ic)
{
/* If there was a gap, mark it dirty */
if ((ofs & ~3) > c->sector_size - jeb->free_size) {
/* Ew. Summary doesn't actually tell us explicitly about dirty space */
jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
}
return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
}
/* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
{
struct jffs2_inode_cache *ic;
struct jffs2_full_dirent *fd;
void *sp;
int i, ino;
int err;
sp = summary->sum;
for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
dbg_summary("processing summary index %d\n", i);
cond_resched();
/* Make sure there's a spare ref for dirty space */
err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
if (err)
return err;
switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
case JFFS2_NODETYPE_INODE: {
struct jffs2_sum_inode_flash *spi;
spi = sp;
ino = je32_to_cpu(spi->inode);
dbg_summary("Inode at 0x%08x-0x%08x\n",
jeb->offset + je32_to_cpu(spi->offset),
jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
ic = jffs2_scan_make_ino_cache(c, ino);
if (!ic) {
JFFS2_NOTICE("scan_make_ino_cache failed\n");
return -ENOMEM;
}
sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
PAD(je32_to_cpu(spi->totlen)), ic);
*pseudo_random += je32_to_cpu(spi->version);
sp += JFFS2_SUMMARY_INODE_SIZE;
break;
}
case JFFS2_NODETYPE_DIRENT: {
struct jffs2_sum_dirent_flash *spd;
int checkedlen;
spd = sp;
dbg_summary("Dirent at 0x%08x-0x%08x\n",
jeb->offset + je32_to_cpu(spd->offset),
jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
/* This should never happen, but https://dev.laptop.org/ticket/4184 */
checkedlen = strnlen(spd->name, spd->nsize);
if (!checkedlen) {
pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n",
jeb->offset +
je32_to_cpu(spd->offset));
return -EIO;
}
if (checkedlen < spd->nsize) {
pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n",
jeb->offset +
je32_to_cpu(spd->offset),
checkedlen);
}
fd = jffs2_alloc_full_dirent(checkedlen+1);
if (!fd)
return -ENOMEM;
memcpy(&fd->name, spd->name, checkedlen);
fd->name[checkedlen] = 0;
ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
if (!ic) {
jffs2_free_full_dirent(fd);
return -ENOMEM;
}
fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED,
PAD(je32_to_cpu(spd->totlen)), ic);
fd->next = NULL;
fd->version = je32_to_cpu(spd->version);
fd->ino = je32_to_cpu(spd->ino);
fd->nhash = full_name_hash(NULL, fd->name, checkedlen);
fd->type = spd->type;
jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
*pseudo_random += je32_to_cpu(spd->version);
sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
break;
}
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR: {
struct jffs2_xattr_datum *xd;
struct jffs2_sum_xattr_flash *spx;
spx = (struct jffs2_sum_xattr_flash *)sp;
dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
jeb->offset + je32_to_cpu(spx->offset),
jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
je32_to_cpu(spx->version));
if (IS_ERR(xd))
return PTR_ERR(xd);
if (xd->version > je32_to_cpu(spx->version)) {
/* node is not the newest one */
struct jffs2_raw_node_ref *raw
= sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
PAD(je32_to_cpu(spx->totlen)), NULL);
raw->next_in_ino = xd->node->next_in_ino;
xd->node->next_in_ino = raw;
} else {
xd->version = je32_to_cpu(spx->version);
sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
PAD(je32_to_cpu(spx->totlen)), (void *)xd);
}
*pseudo_random += je32_to_cpu(spx->xid);
sp += JFFS2_SUMMARY_XATTR_SIZE;
break;
}
case JFFS2_NODETYPE_XREF: {
struct jffs2_xattr_ref *ref;
struct jffs2_sum_xref_flash *spr;
spr = (struct jffs2_sum_xref_flash *)sp;
dbg_summary("xref at %#08x-%#08x\n",
jeb->offset + je32_to_cpu(spr->offset),
jeb->offset + je32_to_cpu(spr->offset) +
(uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
ref = jffs2_alloc_xattr_ref();
if (!ref) {
JFFS2_NOTICE("allocation of xattr_datum failed\n");
return -ENOMEM;
}
ref->next = c->xref_temp;
c->xref_temp = ref;
sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
*pseudo_random += ref->node->flash_offset;
sp += JFFS2_SUMMARY_XREF_SIZE;
break;
}
#endif
default : {
uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
return -EIO;
/* For compatible node types, just fall back to the full scan */
c->wasted_size -= jeb->wasted_size;
c->free_size += c->sector_size - jeb->free_size;
c->used_size -= jeb->used_size;
c->dirty_size -= jeb->dirty_size;
jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
jeb->free_size = c->sector_size;
jffs2_free_jeb_node_refs(c, jeb);
return -ENOTRECOVERABLE;
}
}
}
return 0;
}
/* Process the summary node - called from jffs2_scan_eraseblock() */
int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
struct jffs2_raw_summary *summary, uint32_t sumsize,
uint32_t *pseudo_random)
{
struct jffs2_unknown_node crcnode;
int ret, ofs;
uint32_t crc;
ofs = c->sector_size - sumsize;
dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
jeb->offset, jeb->offset + ofs, sumsize);
/* OK, now check for node validity and CRC */
crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
crcnode.totlen = summary->totlen;
crc = crc32(0, &crcnode, sizeof(crcnode)-4);
if (je32_to_cpu(summary->hdr_crc) != crc) {
dbg_summary("Summary node header is corrupt (bad CRC or "
"no summary at all)\n");
goto crc_err;
}
if (je32_to_cpu(summary->totlen) != sumsize) {
dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
goto crc_err;
}
crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
if (je32_to_cpu(summary->node_crc) != crc) {
dbg_summary("Summary node is corrupt (bad CRC)\n");
goto crc_err;
}
crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
if (je32_to_cpu(summary->sum_crc) != crc) {
dbg_summary("Summary node data is corrupt (bad CRC)\n");
goto crc_err;
}
if ( je32_to_cpu(summary->cln_mkr) ) {
dbg_summary("Summary : CLEANMARKER node \n");
ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
if (ret)
return ret;
if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
return ret;
} else if (jeb->first_node) {
dbg_summary("CLEANMARKER node not first node in block "
"(0x%08x)\n", jeb->offset);
if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
return ret;
} else {
jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
je32_to_cpu(summary->cln_mkr), NULL);
}
}
ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
/* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
scan of this eraseblock. So return zero */
if (ret == -ENOTRECOVERABLE)
return 0;
if (ret)
return ret; /* real error */
/* for PARANOIA_CHECK */
ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
if (ret)
return ret;
sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
if (unlikely(jeb->free_size)) {
JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
jeb->free_size, jeb->offset);
jeb->wasted_size += jeb->free_size;
c->wasted_size += jeb->free_size;
c->free_size -= jeb->free_size;
jeb->free_size = 0;
}
return jffs2_scan_classify_jeb(c, jeb);
crc_err:
JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
return 0;
}
/* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
uint32_t infosize, uint32_t datasize, int padsize)
{
struct jffs2_raw_summary isum;
union jffs2_sum_mem *temp;
struct jffs2_sum_marker *sm;
struct kvec vecs[2];
uint32_t sum_ofs;
void *wpage;
int ret;
size_t retlen;
if (padsize + datasize > MAX_SUMMARY_SIZE) {
/* It won't fit in the buffer. Abort summary for this jeb */
jffs2_sum_disable_collecting(c->summary);
JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
datasize, padsize, jeb->offset);
/* Non-fatal */
return 0;
}
/* Is there enough space for summary? */
if (padsize < 0) {
/* don't try to write out summary for this jeb */
jffs2_sum_disable_collecting(c->summary);
JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
padsize);
/* Non-fatal */
return 0;
}
memset(c->summary->sum_buf, 0xff, datasize);
memset(&isum, 0, sizeof(isum));
isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
isum.totlen = cpu_to_je32(infosize);
isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
isum.padded = cpu_to_je32(c->summary->sum_padded);
isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
isum.sum_num = cpu_to_je32(c->summary->sum_num);
wpage = c->summary->sum_buf;
while (c->summary->sum_num) {
temp = c->summary->sum_list_head;
switch (je16_to_cpu(temp->u.nodetype)) {
case JFFS2_NODETYPE_INODE: {
struct jffs2_sum_inode_flash *sino_ptr = wpage;
sino_ptr->nodetype = temp->i.nodetype;
sino_ptr->inode = temp->i.inode;
sino_ptr->version = temp->i.version;
sino_ptr->offset = temp->i.offset;
sino_ptr->totlen = temp->i.totlen;
wpage += JFFS2_SUMMARY_INODE_SIZE;
break;
}
case JFFS2_NODETYPE_DIRENT: {
struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
sdrnt_ptr->nodetype = temp->d.nodetype;
sdrnt_ptr->totlen = temp->d.totlen;
sdrnt_ptr->offset = temp->d.offset;
sdrnt_ptr->pino = temp->d.pino;
sdrnt_ptr->version = temp->d.version;
sdrnt_ptr->ino = temp->d.ino;
sdrnt_ptr->nsize = temp->d.nsize;
sdrnt_ptr->type = temp->d.type;
memcpy(sdrnt_ptr->name, temp->d.name,
temp->d.nsize);
wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
break;
}
#ifdef CONFIG_JFFS2_FS_XATTR
case JFFS2_NODETYPE_XATTR: {
struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
temp = c->summary->sum_list_head;
sxattr_ptr->nodetype = temp->x.nodetype;
sxattr_ptr->xid = temp->x.xid;
sxattr_ptr->version = temp->x.version;
sxattr_ptr->offset = temp->x.offset;
sxattr_ptr->totlen = temp->x.totlen;
wpage += JFFS2_SUMMARY_XATTR_SIZE;
break;
}
case JFFS2_NODETYPE_XREF: {
struct jffs2_sum_xref_flash *sxref_ptr = wpage;
temp = c->summary->sum_list_head;
sxref_ptr->nodetype = temp->r.nodetype;
sxref_ptr->offset = temp->r.offset;
wpage += JFFS2_SUMMARY_XREF_SIZE;
break;
}
#endif
default : {
if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
== JFFS2_FEATURE_RWCOMPAT_COPY) {
dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
je16_to_cpu(temp->u.nodetype));
jffs2_sum_disable_collecting(c->summary);
} else {
BUG(); /* unknown node in summary information */
}
}
}
c->summary->sum_list_head = temp->u.next;
kfree(temp);
c->summary->sum_num--;
}
jffs2_sum_reset_collected(c->summary);
wpage += padsize;
sm = wpage;
sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
vecs[0].iov_base = &isum;
vecs[0].iov_len = sizeof(isum);
vecs[1].iov_base = c->summary->sum_buf;
vecs[1].iov_len = datasize;
sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
dbg_summary("writing out data to flash to pos : 0x%08x\n", sum_ofs);
ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
if (ret || (retlen != infosize)) {
JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
infosize, sum_ofs, ret, retlen);
if (retlen) {
/* Waste remaining space */
spin_lock(&c->erase_completion_lock);
jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
spin_unlock(&c->erase_completion_lock);
}
c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
return 0;
}
spin_lock(&c->erase_completion_lock);
jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
spin_unlock(&c->erase_completion_lock);
return 0;
}
/* Write out summary information - called from jffs2_do_reserve_space */
int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
__must_hold(&c->erase_completion_block)
{
int datasize, infosize, padsize;
struct jffs2_eraseblock *jeb;
int ret = 0;
dbg_summary("called\n");
spin_unlock(&c->erase_completion_lock);
jeb = c->nextblock;
jffs2_prealloc_raw_node_refs(c, jeb, 1);
if (!c->summary->sum_num || !c->summary->sum_list_head) {
JFFS2_WARNING("Empty summary info!!!\n");
BUG();
}
datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
infosize = sizeof(struct jffs2_raw_summary) + datasize;
padsize = jeb->free_size - infosize;
infosize += padsize;
datasize += padsize;
ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
spin_lock(&c->erase_completion_lock);
return ret;
}