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authorDavid Woodhouse <dwmw2@infradead.org>2006-06-18 22:44:21 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2006-06-18 22:44:21 +0100
commit1046d88001e7b8819f60dece2eaf1b44bf4b4460 (patch)
tree82a8f62e785375b2f43bbb3f2b52da60775b5b56 /fs
parent[JFFS2] When retiring nextblock, allocate a node_ref for the wasted space (diff)
downloadlinux-dev-1046d88001e7b8819f60dece2eaf1b44bf4b4460.tar.xz
linux-dev-1046d88001e7b8819f60dece2eaf1b44bf4b4460.zip
[JFFS2] Check CRC32 on dirent and data nodes each time they're read
Also, make sure dirents are marked REF_UNCHECKED when we 'discover' them through eraseblock summary. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/jffs2/readinode.c51
-rw-r--r--fs/jffs2/summary.c2
2 files changed, 38 insertions, 15 deletions
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index 5351b34d5419..5ea4faafa2d3 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -116,19 +116,42 @@ static inline int read_direntry(struct jffs2_sb_info *c, struct jffs2_raw_node_r
uint32_t *latest_mctime, uint32_t *mctime_ver)
{
struct jffs2_full_dirent *fd;
+ uint32_t crc;
- /* The direntry nodes are checked during the flash scanning */
- BUG_ON(ref_flags(ref) == REF_UNCHECKED);
/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
BUG_ON(ref_obsolete(ref));
- /* Sanity check */
- if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) {
- JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n",
- ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen));
+ crc = crc32(0, rd, sizeof(*rd) - 8);
+ if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
+ JFFS2_NOTICE("header CRC failed on dirent node at %#08x: read %#08x, calculated %#08x\n",
+ ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
return 1;
}
+ /* If we've never checked the CRCs on this node, check them now */
+ if (ref_flags(ref) == REF_UNCHECKED) {
+ struct jffs2_eraseblock *jeb;
+ int len;
+
+ /* Sanity check */
+ if (unlikely(PAD((rd->nsize + sizeof(*rd))) != PAD(je32_to_cpu(rd->totlen)))) {
+ JFFS2_ERROR("illegal nsize in node at %#08x: nsize %#02x, totlen %#04x\n",
+ ref_offset(ref), rd->nsize, je32_to_cpu(rd->totlen));
+ return 1;
+ }
+
+ jeb = &c->blocks[ref->flash_offset / c->sector_size];
+ len = ref_totlen(c, jeb, ref);
+
+ spin_lock(&c->erase_completion_lock);
+ jeb->used_size += len;
+ jeb->unchecked_size -= len;
+ c->used_size += len;
+ c->unchecked_size -= len;
+ ref->flash_offset = ref_offset(ref) | REF_PRISTINE;
+ spin_unlock(&c->erase_completion_lock);
+ }
+
fd = jffs2_alloc_full_dirent(rd->nsize + 1);
if (unlikely(!fd))
return -ENOMEM;
@@ -198,10 +221,18 @@ static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref
struct jffs2_tmp_dnode_info *tn;
uint32_t len, csize;
int ret = 1;
+ uint32_t crc;
/* Obsoleted. This cannot happen, surely? dwmw2 20020308 */
BUG_ON(ref_obsolete(ref));
+ crc = crc32(0, rd, sizeof(*rd) - 8);
+ if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
+ JFFS2_NOTICE("node CRC failed on dnode at %#08x: read %#08x, calculated %#08x\n",
+ ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
+ return 1;
+ }
+
tn = jffs2_alloc_tmp_dnode_info();
if (!tn) {
JFFS2_ERROR("failed to allocate tn (%zu bytes).\n", sizeof(*tn));
@@ -213,14 +244,6 @@ static inline int read_dnode(struct jffs2_sb_info *c, struct jffs2_raw_node_ref
/* If we've never checked the CRCs on this node, check them now */
if (ref_flags(ref) == REF_UNCHECKED) {
- uint32_t crc;
-
- crc = crc32(0, rd, sizeof(*rd) - 8);
- if (unlikely(crc != je32_to_cpu(rd->node_crc))) {
- JFFS2_NOTICE("header CRC failed on node at %#08x: read %#08x, calculated %#08x\n",
- ref_offset(ref), je32_to_cpu(rd->node_crc), crc);
- goto free_out;
- }
/* Sanity checks */
if (unlikely(je32_to_cpu(rd->offset) > je32_to_cpu(rd->isize)) ||
diff --git a/fs/jffs2/summary.c b/fs/jffs2/summary.c
index 51bf1654ce3b..0b02fc79e4d1 100644
--- a/fs/jffs2/summary.c
+++ b/fs/jffs2/summary.c
@@ -453,7 +453,7 @@ static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eras
return -ENOMEM;
}
- fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_PRISTINE,
+ 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;