WIP large file support

[yaffs2.git] / yaffs_guts.h

diff --git a/yaffs_guts.h b/yaffs_guts.h
index fc311435207c08bcdbbbd115695e702d610d6aa8..a063776913780d65dfa9ff20e45df468e9c0f726 100644 (file)
--- a/yaffs_guts.h
+++ b/yaffs_guts.h
@@ -29,6 +29,18 @@
  */
 #define YAFFS_MAGIC                    0x5941ff53
 
+/*
+ * Tnodes form a tree with the tnodes in "levels"
+ * Levels greater than 0 hold 8 slots which point to other tnodes.
+ * Those at level 0 hold 16 slots which point to chunks in NAND.
+ *
+ * A maximum level of 8 thust supports files of size up to:
+ *
+ * 2^(3*MAX_LEVEL+4)
+ *
+ * Thus a max level of 8 supports files with up to 2^^28 chunks which gives
+ * a maximum file size of arounf 51Gbytees with 2k chunks.
+ */
 #define YAFFS_NTNODES_LEVEL0           16
 #define YAFFS_TNODES_LEVEL0_BITS       4
 #define YAFFS_TNODES_LEVEL0_MASK       0xf
@@ -36,15 +48,15 @@
 #define YAFFS_NTNODES_INTERNAL         (YAFFS_NTNODES_LEVEL0 / 2)
 #define YAFFS_TNODES_INTERNAL_BITS     (YAFFS_TNODES_LEVEL0_BITS - 1)
 #define YAFFS_TNODES_INTERNAL_MASK     0x7
-#define YAFFS_TNODES_MAX_LEVEL         6
+#define YAFFS_TNODES_MAX_LEVEL         8
+
 
-#ifndef CONFIG_YAFFS_NO_YAFFS1
+/* Constants for YAFFS1 mode */
 #define YAFFS_BYTES_PER_SPARE          16
 #define YAFFS_BYTES_PER_CHUNK          512
 #define YAFFS_CHUNK_SIZE_SHIFT         9
 #define YAFFS_CHUNKS_PER_BLOCK         32
 #define YAFFS_BYTES_PER_BLOCK  (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
-#endif
 
 #define YAFFS_MIN_YAFFS2_CHUNK_SIZE    1024
 #define YAFFS_MIN_YAFFS2_SPARE_SIZE    32
@@ -60,7 +72,7 @@
 #define YAFFS_OBJECT_SPACE             0x40000
 #define YAFFS_MAX_OBJECT_ID            (YAFFS_OBJECT_SPACE - 1)
 
-#define YAFFS_CHECKPOINT_VERSION       4
+#define YAFFS_CHECKPOINT_VERSION       5
 
 #ifdef CONFIG_YAFFS_UNICODE
 #define YAFFS_MAX_NAME_LENGTH          127
@@ -119,12 +131,11 @@ struct yaffs_cache {
        u8 *data;
 };
 
-/* Tags structures in RAM
+/* yaffs1 tags structures in RAM
  * NB This uses bitfield. Bitfields should not straddle a u32 boundary
  * otherwise the structure size will get blown out.
  */
 
-#ifndef CONFIG_YAFFS_NO_YAFFS1
 struct yaffs_tags {
        unsigned chunk_id:20;
        unsigned serial_number:2;
@@ -139,7 +150,6 @@ union yaffs_tags_union {
        u8 as_bytes[8];
 };
 
-#endif
 
 /* Stuff used for extended tags in YAFFS2 */
 
@@ -187,7 +197,7 @@ struct yaffs_ext_tags {
 
        enum yaffs_obj_type extra_obj_type;     /* What object type? */
 
-       unsigned extra_length;  /* Length if it is a file */
+       loff_t extra_file_size;         /* Length if it is a file */
        unsigned extra_equiv_id;        /* Equivalent object for a hard link */
 };
 
@@ -284,10 +294,8 @@ struct yaffs_block_info {
                                failures on this block and tried to reuse it */
        u32 has_summary:1;      /* The block has a summary */
 
-#ifdef CONFIG_YAFFS_YAFFS2
        u32 has_shrink_hdr:1;   /* This block has at least one shrink header */
        u32 seq_number;         /* block sequence number for yaffs2 */
-#endif
 
 };
 
@@ -312,7 +320,7 @@ struct yaffs_obj_hdr {
        u32 yst_ctime;
 
        /* File size  applies to files only */
-       int file_size;
+       u32 file_size_low;
 
        /* Equivalent object id applies to hard links only. */
        int equiv_id;
@@ -329,7 +337,8 @@ struct yaffs_obj_hdr {
        u32 inband_shadowed_obj_id;
        u32 inband_is_shrink;
 
-       u32 reserved[2];
+       u32 file_size_high;
+       u32 reserved[1];
        int shadows_obj;        /* This object header shadows the
                                specified object if > 0 */
 
@@ -353,9 +362,9 @@ struct yaffs_tnode {
  */
 
 struct yaffs_file_var {
-       u32 file_size;
-       u32 scanned_size;
-       u32 shrink_size;
+       loff_t file_size;
+       loff_t scanned_size;
+       loff_t shrink_size;
        int top_level;
        struct yaffs_tnode *top;
 };
@@ -436,9 +445,7 @@ struct yaffs_obj {
 
        u32 yst_mode;
 
-#ifndef CONFIG_YAFFS_NO_SHORT_NAMES
        YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
-#endif
 
 #ifdef CONFIG_YAFFS_WINCE
        u32 win_ctime[2];
@@ -485,7 +492,7 @@ struct yaffs_checkpt_obj {
        u8 unlink_allowed:1;
        u8 serial;
        int n_data_chunks;
-       u32 size_or_equiv_obj;
+       loff_t size_or_equiv_obj;
 };
 
 /*--------------------- Temporary buffers ----------------
@@ -524,6 +531,7 @@ struct yaffs_param {
                                 */
        int use_nand_ecc;       /* Flag to decide whether or not to use
                                 * NAND driver ECC on data (yaffs1) */
+        int tags_9bytes;       /* Use 9 byte tags */
        int no_tags_ecc;        /* Flag to decide whether or not to do ECC
                                 * on packed tags (yaffs2) */
 
@@ -551,7 +559,7 @@ struct yaffs_param {
        int (*initialise_flash_fn) (struct yaffs_dev *dev);
        int (*deinitialise_flash_fn) (struct yaffs_dev *dev);
 
-#ifdef CONFIG_YAFFS_YAFFS2
+       /* yaffs2 mode functions */
        int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
                                    int nand_chunk, const u8 *data,
                                    const struct yaffs_ext_tags *tags);
@@ -562,7 +570,6 @@ struct yaffs_param {
        int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
                               enum yaffs_block_state *state,
                               u32 *seq_number);
-#endif
 
        /* The remove_obj_fn function must be supplied by OS flavours that
         * need it.
@@ -750,7 +757,7 @@ struct yaffs_dev {
        u32 oldest_dirty_gc_count;
        u32 n_gc_blocks;
        u32 bg_gcs;
-       u32 n_retired_writes;
+       u32 n_retried_writes;
        u32 n_retired_blocks;
        u32 n_ecc_fixed;
        u32 n_ecc_unfixed;
@@ -822,7 +829,7 @@ int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
 int yaffs_del_obj(struct yaffs_obj *obj);
 
 int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
-int yaffs_get_obj_length(struct yaffs_obj *obj);
+loff_t yaffs_get_obj_length(struct yaffs_obj *obj);
 int yaffs_get_obj_inode(struct yaffs_obj *obj);
 unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
 int yaffs_get_obj_link_count(struct yaffs_obj *obj);
@@ -941,4 +948,14 @@ u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
                         unsigned pos);
 
 int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
+
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+                               int *chunk_out, u32 *offset_out);
+/*
+ * Marshalling functions to get loff_t file sizes into aand out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize);
+loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh);
+
 #endif