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         u32 version;
  12         union {
  13                 u32 ino; /* for inodes */
  14                 u32 pino; /* for dirents */
  15         };
  16 };
  17
  18 struct b_list {
  19         struct b_node *listTail;
  20         struct b_node *listHead;
  21 #ifdef CONFIG_SYS_JFFS2_SORT_FRAGMENTS
  22         struct b_node *listLast;
  23         int (*listCompare)(struct b_node *new, struct b_node *node);
  24         u32 listLoops;
  25 #endif
  26         u32 listCount;
  27         struct mem_block *listMemBase;
  28 };
  29
  30 struct b_lists {
  31         struct b_list dir;
  32         struct b_list frag;
  33         void *readbuf;
  34 };
  35
  36 struct b_compr_info {
  37         u32 num_frags;
  38         u32 compr_sum;
  39         u32 decompr_sum;
  40 };
  41
  42 struct b_jffs2_info {
  43         struct b_compr_info compr_info[JFFS2_NUM_COMPR];
  44 };
  45
  46 static inline int
  47 hdr_crc(struct jffs2_unknown_node *node)
  48 {
  49 #if 1
  50         u32 crc = crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
  51 #else
  52         /* what's the semantics of this? why is this here? */
  53         u32 crc = crc32_no_comp(~0, (unsigned char *)node, sizeof(struct jffs2_unknown_node) - 4);
  54
  55         crc ^= ~0;
  56 #endif
  57         if (node->hdr_crc != crc) {
  58                 return 0;
  59         } else {
  60                 return 1;
  61         }
  62 }
  63
  64 static inline int
  65 dirent_crc(struct jffs2_raw_dirent *node)
  66 {
  67         if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_dirent) - 8)) {
  68                 return 0;
  69         } else {
  70                 return 1;
  71         }
  72 }
  73
  74 static inline int
  75 dirent_name_crc(struct jffs2_raw_dirent *node)
  76 {
  77         if (node->name_crc != crc32_no_comp(0, (unsigned char *)&(node->name), node->nsize)) {
  78                 return 0;
  79         } else {
  80                 return 1;
  81         }
  82 }
  83
  84 static inline int
  85 inode_crc(struct jffs2_raw_inode *node)
  86 {
  87         if (node->node_crc != crc32_no_comp(0, (unsigned char *)node, sizeof(struct jffs2_raw_inode) - 8)) {
  88                 return 0;
  89         } else {
  90                 return 1;
  91         }
  92 }
  93
  94 static inline int
  95 data_crc(struct jffs2_raw_inode *node)
  96 {
  97         if (node->data_crc != crc32_no_comp(0, (unsigned char *)
  98                                             ((int) &node->node_crc + sizeof (node->node_crc)),
  99                                              node->csize)) {
 100                 return 0;
 101         } else {
 102                 return 1;
 103         }
 104 }
 105
 106 #if defined(CONFIG_SYS_JFFS2_SORT_FRAGMENTS)
 107 /* External merge sort. */
 108 int sort_list(struct b_list *list);
 109 #endif
 110 #endif /* jffs2_private.h */