Add large file support changes to yaffs_vfs_single.c

[yaffs2.git] / yaffs_guts.h

diff --git a/yaffs_guts.h b/yaffs_guts.h
index 490122aa16679ae8d46162f083a88661e50c1795..b3bc574a51b29fe2b99159898e9ea27157a765bd 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
@@ -36,8 +48,11 @@
 #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
+#define YAFFS_TNODES_MAX_BITS          (YAFFS_TNODES_LEVEL0_BITS + \
+                                       YAFFS_TNODES_INTERNAL_BITS * \
+                                       YAFFS_TNODES_MAX_LEVEL)
+#define YAFFS_MAX_CHUNK_ID             ((1 << YAFFS_TNODES_MAX_BITS) - 1)
 
 /* Constants for YAFFS1 mode */
 #define YAFFS_BYTES_PER_SPARE          16
@@ -49,7 +64,7 @@
 #define YAFFS_MIN_YAFFS2_CHUNK_SIZE    1024
 #define YAFFS_MIN_YAFFS2_SPARE_SIZE    32
 
-#define YAFFS_MAX_CHUNK_ID             0x000fffff
+
 
 #define YAFFS_ALLOCATION_NOBJECTS      100
 #define YAFFS_ALLOCATION_NTNODES       100
@@ -60,7 +75,7 @@
 #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
@@ -185,7 +200,7 @@ 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 */
 };
 
@@ -308,7 +323,7 @@ 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;
@@ -325,7 +340,8 @@ 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 */
 
@@ -349,9 +365,9 @@ 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;
 };
@@ -479,7 +495,7 @@ 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 ----------------
@@ -587,6 +603,11 @@ struct yaffs_param {
        int always_check_erased;        /* Force chunk erased check always on */
 
        int disable_summary;
+
+       int max_objects;        /*
+                                * Set to limit the number of objects created.
+                                * 0 = no limit.
+                               */
 };
 
 struct yaffs_dev {
@@ -816,7 +837,7 @@ 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);
@@ -935,4 +956,16 @@ 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);
+loff_t yaffs_max_file_size(struct yaffs_dev *dev);
+
+
 #endif