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authorIlya Yanok <yanok@emcraft.com>2008-11-13 19:49:35 +0300
committerWolfgang Denk <wd@denx.de>2008-12-09 23:39:59 +0100
commit9b7076229ec6a958bd835ab70745f7676297ce82 (patch)
treedaf8d517fffc53bbc0614337183e85d0210d0f29 /fs/jffs2/jffs2_1pass.c
parent70741004dc28946cd82c7af6789c4ddb3fc94526 (diff)
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jffs2: summary support
This patch adds support for reading fs information from summary node instead of scanning full eraseblock. Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Diffstat (limited to 'fs/jffs2/jffs2_1pass.c')
-rw-r--r--fs/jffs2/jffs2_1pass.c187
1 files changed, 186 insertions, 1 deletions
diff --git a/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c
index 73d3ddc..4e49a05 100644
--- a/fs/jffs2/jffs2_1pass.c
+++ b/fs/jffs2/jffs2_1pass.c
@@ -138,6 +138,8 @@
# define DEBUGF(fmt,args...)
#endif
+#include "summary.h"
+
/* keeps pointer to currentlu processed partition */
static struct part_info *current_part;
@@ -1214,6 +1216,132 @@ jffs2_1pass_rescan_needed(struct part_info *part)
return 0;
}
+#define dbg_summary(...) do {} while (0);
+/* Process the stored summary information - helper function for
+ * jffs2_sum_scan_sumnode()
+ */
+
+static int jffs2_sum_process_sum_data(struct part_info *part, uint32_t offset,
+ struct jffs2_raw_summary *summary,
+ struct b_lists *pL)
+{
+ void *sp;
+ int i;
+
+ sp = summary->sum;
+
+ for (i = 0; i < summary->sum_num; i++) {
+ dbg_summary("processing summary index %d\n", i);
+
+ switch (((struct jffs2_sum_unknown_flash *)sp)->nodetype) {
+ case JFFS2_NODETYPE_INODE: {
+ struct jffs2_sum_inode_flash *spi;
+ spi = sp;
+
+ dbg_summary("Inode at 0x%08x-0x%08x\n",
+ offset + spi->offset,
+ offset + spi->offset + spi->totlen);
+
+ if (insert_node(&pL->frag, (u32) part->offset +
+ offset + spi->offset) == NULL)
+ return -1;
+
+ sp += JFFS2_SUMMARY_INODE_SIZE;
+
+ break;
+ }
+
+ 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;
+ }
+ }
+ }
+ return 0;
+}
+
+/* Process the summary node - called from jffs2_scan_eraseblock() */
+int jffs2_sum_scan_sumnode(struct part_info *part, uint32_t offset,
+ struct jffs2_raw_summary *summary, uint32_t sumsize,
+ struct b_lists *pL)
+{
+ struct jffs2_unknown_node crcnode;
+ int ret, ofs;
+ uint32_t crc;
+
+ ofs = part->sector_size - sumsize;
+
+ dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
+ offset, offset + ofs, sumsize);
+
+ /* OK, now check for node validity and CRC */
+ crcnode.magic = JFFS2_MAGIC_BITMASK;
+ crcnode.nodetype = JFFS2_NODETYPE_SUMMARY;
+ crcnode.totlen = summary->totlen;
+ crc = crc32_no_comp(0, (uchar *)&crcnode, sizeof(crcnode)-4);
+
+ if (summary->hdr_crc != crc) {
+ dbg_summary("Summary node header is corrupt (bad CRC or "
+ "no summary at all)\n");
+ goto crc_err;
+ }
+
+ if (summary->totlen != sumsize) {
+ dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
+ goto crc_err;
+ }
+
+ crc = crc32_no_comp(0, (uchar *)summary,
+ sizeof(struct jffs2_raw_summary)-8);
+
+ if (summary->node_crc != crc) {
+ dbg_summary("Summary node is corrupt (bad CRC)\n");
+ goto crc_err;
+ }
+
+ crc = crc32_no_comp(0, (uchar *)summary->sum,
+ sumsize - sizeof(struct jffs2_raw_summary));
+
+ if (summary->sum_crc != crc) {
+ dbg_summary("Summary node data is corrupt (bad CRC)\n");
+ goto crc_err;
+ }
+
+ if (summary->cln_mkr)
+ dbg_summary("Summary : CLEANMARKER node \n");
+
+ ret = jffs2_sum_process_sum_data(part, offset, summary, pL);
+ if (ret)
+ return ret; /* real error */
+
+ return 1;
+
+crc_err:
+ putstr("Summary node crc error, skipping summary information.\n");
+
+ return 0;
+}
+
#ifdef DEBUG_FRAGMENTS
static void
dump_fragments(struct b_lists *pL)
@@ -1321,10 +1449,65 @@ jffs2_1pass_build_lists(struct part_info * part)
for (i = 0; i < nr_sectors; i++) {
uint32_t sector_ofs = i * part->sector_size;
uint32_t buf_ofs = sector_ofs;
- uint32_t buf_len = EMPTY_SCAN_SIZE(part->sector_size);
+ uint32_t buf_len;
uint32_t ofs, prevofs;
+ struct jffs2_sum_marker *sm;
+ void *sumptr = NULL;
+ uint32_t sumlen;
+ int ret;
WATCHDOG_RESET();
+
+ buf_len = sizeof(*sm);
+
+ /* Read as much as we want into the _end_ of the preallocated
+ * buffer
+ */
+ get_fl_mem(part->offset + sector_ofs + part->sector_size -
+ buf_len, buf_len, buf + buf_size - buf_len);
+
+ sm = (void *)buf + buf_size - sizeof(*sm);
+ if (sm->magic == JFFS2_SUM_MAGIC) {
+ sumlen = part->sector_size - sm->offset;
+ sumptr = buf + buf_size - sumlen;
+
+ /* Now, make sure the summary itself is available */
+ if (sumlen > buf_size) {
+ /* Need to kmalloc for this. */
+ sumptr = malloc(sumlen);
+ if (!sumptr) {
+ putstr("Can't get memory for summary "
+ "node!\n");
+ return 0;
+ }
+ memcpy(sumptr + sumlen - buf_len, buf +
+ buf_size - buf_len, buf_len);
+ }
+ if (buf_len < sumlen) {
+ /* Need to read more so that the entire summary
+ * node is present
+ */
+ get_fl_mem(part->offset + sector_ofs +
+ part->sector_size - sumlen,
+ sumlen - buf_len, sumptr);
+ }
+ }
+
+ if (sumptr) {
+ ret = jffs2_sum_scan_sumnode(part, sector_ofs, sumptr,
+ sumlen, pL);
+
+ if (buf_size && sumlen > buf_size)
+ free(sumptr);
+ if (ret < 0)
+ return 0;
+ if (ret)
+ continue;
+
+ }
+
+ buf_len = EMPTY_SCAN_SIZE(part->sector_size);
+
get_fl_mem((u32)part->offset + buf_ofs, buf_len, buf);
/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
@@ -1477,6 +1660,8 @@ jffs2_1pass_build_lists(struct part_info * part)
node->totlen,
sizeof(struct jffs2_unknown_node));
break;
+ case JFFS2_NODETYPE_SUMMARY:
+ break;
default:
printf("Unknown node type: %x len %d offset 0x%x\n",
node->nodetype,