fs/jffs2/jffs2_private.h

   1 #ifndef jffs2_private_h
   2 #define jffs2_private_h
   3
   4 #include <jffs2/jffs2.h>
   5
   6
   7 struct b_node {
   8         u32 offset;
   9         struct b_node *next;
  10         enum { CRC_UNKNOWN = 0, CRC_OK, CRC_BAD } datacrc;
  11 };
  12
  13 struct b_list {
  14         struct b_node *listTail;
  15         struct b_node *listHead;
  16 #ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
  17         struct b_node *listLast;
  18         int (*listCompare)(struct b_node *new, struct b_node *node);
  19         u32 listLoops;
  20 #endif
  21         u32 listCount;
  22         struct mem_block *listMemBase;
  23 };
  24
  25 struct b_lists {
  26         struct b_list dir;
  27         struct b_list frag;
  28         void *readbuf;
  29 };
  30
  31 struct b_compr_info {
  32         u32 num_frags;
  33         u32 compr_sum;
  34         u32 decompr_sum;
  35 };
  36
  37 struct b_jffs2_info {
  38         struct b_compr_info compr_info[JFFS2_NUM_COMPR];
  39 };
  40
  41 static inline int
  42 hdr_crc(struct jffs2_unknown_node *node)
  43 {
  44 #if 1
  45         u32 crc = crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
  46 #else
  47         /* what's the semantics of this? why is this here? */
  48         u32 crc = crc32_no_comp(~0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
  49
  50         crc ^= ~0;
  51 #endif
  52         if (node->hdr_crc != crc) {
  53                 return 0;
  54         } else {
  55                 return 1;
  56         }
  57 }
  58
  59 static inline int
  60 dirent_crc(struct jffs2_raw_dirent *node)
  61 {
  62         if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_dirent) - 8)) {
  63                 return 0;
  64         } else {
  65                 return 1;
  66         }
  67 }
  68
  69 static inline int
  70 dirent_name_crc(struct jffs2_raw_dirent *node)
  71 {
  72         if (node->name_crc != crc32_no_comp(0, (unsigned char *)&(node->name), node->nsize)) {
  73                 return 0;
  74         } else {
  75                 return 1;
  76         }
  77 }
  78
  79 static inline int
  80 inode_crc(struct jffs2_raw_inode *node)
  81 {
  82         if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_inode) - 8)) {
  83                 return 0;
  84         } else {
  85                 return 1;
  86         }
  87 }
  88
  89 static inline int
  90 data_crc(struct jffs2_raw_inode *node)
  91 {
  92         if (node->data_crc != crc32_no_comp(0, (unsigned char *)
  93                                             ((int) &node->node_crc + sizeof (node->node_crc)),
  94                                              node->csize)) {
  95                 return 0;
  96         } else {
  97                 return 1;
  98         }
  99 }
 100
 101 #endif /* jffs2_private.h */