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jffs2: some fixes to summary support 

This patch fixes some issues with JFFS2 summary support in U-Boot.
1/ Summary support made compilation configurable (as summary support
considered expiremental even in Linux).
2/ Summary code can do unaligned 16-bit and 32-bit memory accesses.
We need to get data byte by byte to exclude data aborts.
3/ Make summary scan in two passes so we can safely fall back to full
scan if we found unsupported entry in the summary.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
This commit is contained in:
Ilya Yanok 2009-07-17 15:02:42 +04:00 committed by Wolfgang Denk
parent 11906936e1
commit 8cf19b9fec
1 changed files with 80 additions and 40 deletions
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120
fs/jffs2/jffs2_1pass.c
View File

@ -120,6 +120,7 @@
#include <jffs2/jffs2.h>
#include <jffs2/jffs2_1pass.h>
#include <linux/mtd/compat.h>
#include <asm/errno.h>
#include "jffs2_private.h"
@ -1200,8 +1201,30 @@ jffs2_1pass_rescan_needed(struct part_info *part)
return 0;
}
#ifdef CONFIG_JFFS2_SUMMARY
static u32 sum_get_unaligned32(u32 *ptr)
{
u32 val;
u8 *p = (u8 *)ptr;
val = *p | (*(p + 1) << 8) | (*(p + 2) << 16) | (*(p + 3) << 24);
return __le32_to_cpu(val);
}
static u16 sum_get_unaligned16(u16 *ptr)
{
u16 val;
u8 *p = (u8 *)ptr;
val = *p | (*(p + 1) << 8);
return __le16_to_cpu(val);
}
#define dbg_summary(...) do {} while (0);
/* Process the stored summary information - helper function for
/*
* Process the stored summary information - helper function for
* jffs2_sum_scan_sumnode()
*/
@ -1210,54 +1233,64 @@ static int jffs2_sum_process_sum_data(struct part_info *part, uint32_t offset,
struct b_lists *pL)
{
void *sp;
int i;
int i, pass;
void *ret;
sp = summary->sum;
for (pass = 0; pass < 2; pass++) {
sp = summary->sum;
for (i = 0; i < summary->sum_num; i++) {
dbg_summary("processing summary index %d\n", i);
for (i = 0; i < summary->sum_num; i++) {
struct jffs2_sum_unknown_flash *spu = sp;
dbg_summary("processing summary index %d\n", i);
switch (((struct jffs2_sum_unknown_flash *)sp)->nodetype) {
case JFFS2_NODETYPE_INODE: {
switch (sum_get_unaligned16(&spu->nodetype)) {
case JFFS2_NODETYPE_INODE: {
struct jffs2_sum_inode_flash *spi;
spi = sp;
if (pass) {
spi = sp;
dbg_summary("Inode at 0x%08x-0x%08x\n",
offset + spi->offset,
offset + spi->offset + spi->totlen);
ret = insert_node(&pL->frag,
(u32)part->offset +
offset +
sum_get_unaligned32(
&spi->offset));
if (ret == NULL)
return -1;
}
if (insert_node(&pL->frag, (u32) part->offset +
offset + spi->offset) == NULL)
return -1;
sp += JFFS2_SUMMARY_INODE_SIZE;
sp += JFFS2_SUMMARY_INODE_SIZE;
break;
}
case JFFS2_NODETYPE_DIRENT: {
struct jffs2_sum_dirent_flash *spd;
spd = sp;
if (pass) {
ret = insert_node(&pL->dir,
(u32) part->offset +
offset +
sum_get_unaligned32(
&spd->offset));
if (ret == NULL)
return -1;
}
break;
}
sp += JFFS2_SUMMARY_DIRENT_SIZE(
spd->nsize);
case JFFS2_NODETYPE_DIRENT: {
struct jffs2_sum_dirent_flash *spd;
spd = sp;
dbg_summary("Dirent at 0x%08x-0x%08x\n",
offset + spd->offset,
offset + spd->offset + spd->totlen);
if (insert_node(&pL->dir, (u32) part->offset +
offset + spd->offset) == NULL)
return -1;
sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
break;
}
default : {
uint16_t nodetype =
((struct jffs2_sum_unknown_flash *)
sp)->nodetype;
printf("Unsupported node type %x found in "
"summary!\n", nodetype);
break;
break;
}
default : {
uint16_t nodetype = sum_get_unaligned16(
&spu->nodetype);
printf("Unsupported node type %x found"
" in summary!\n",
nodetype);
if ((nodetype & JFFS2_COMPAT_MASK) ==
JFFS2_FEATURE_INCOMPAT)
return -EIO;
return -EBADMSG;
}
}
}
}
@ -1315,6 +1348,8 @@ int jffs2_sum_scan_sumnode(struct part_info *part, uint32_t offset,
dbg_summary("Summary : CLEANMARKER node \n");
ret = jffs2_sum_process_sum_data(part, offset, summary, pL);
if (ret == -EBADMSG)
return 0;
if (ret)
return ret; /* real error */
@ -1325,6 +1360,7 @@ crc_err:
return 0;
}
#endif /* CONFIG_JFFS2_SUMMARY */
#ifdef DEBUG_FRAGMENTS
static void
@ -1430,13 +1466,16 @@ jffs2_1pass_build_lists(struct part_info * part)
uint32_t buf_ofs = sector_ofs;
uint32_t buf_len;
uint32_t ofs, prevofs;
#ifdef CONFIG_JFFS2_SUMMARY
struct jffs2_sum_marker *sm;
void *sumptr = NULL;
uint32_t sumlen;
int ret;
#endif
WATCHDOG_RESET();
#ifdef CONFIG_JFFS2_SUMMARY
buf_len = sizeof(*sm);
/* Read as much as we want into the _end_ of the preallocated
@ -1489,6 +1528,7 @@ jffs2_1pass_build_lists(struct part_info * part)
continue;
}
#endif /* CONFIG_JFFS2_SUMMARY */
buf_len = EMPTY_SCAN_SIZE(part->sector_size);