[JFFS2] Check CRC32 on dirent and data nodes each time they're read

[powerpc.git] / fs / jffs2 / readinode.c

diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index 5351b34..5ea4faa 100644 (file)
--- 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)) ||