Add support for extents to libext2fs

[tools/e2fsprogs.git] / lib / ext2fs / ext2fs.h

diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 731033f..563ec30 100644 (file)
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -290,6 +290,65 @@ struct struct_ext2_filsys {
 #endif
 
 /*
+ * Generic (non-filesystem layout specific) extents structure
+ */
+
+#define EXT2_EXTENT_FLAGS_LEAF         0x0001
+#define EXT2_EXTENT_FLAGS_UNINIT       0x0002
+#define EXT2_EXTENT_FLAGS_SECOND_VISIT 0x0004
+
+struct ext2fs_extent {
+       blk64_t e_pblk;         /* first physical block */
+       blk64_t e_lblk;         /* first logical block extent covers */
+       __u32   e_len;          /* number of blocks covered by extent */
+       __u32   e_flags;        /* extent flags */
+};
+
+typedef struct ext2_extent_handle *ext2_extent_handle_t;
+typedef struct ext2_extent_path *ext2_extent_path_t;
+
+/*
+ * Flags used by ext2fs_extent_get()
+ */
+#define EXT2_EXTENT_CURRENT    0x0000
+#define EXT2_EXTENT_MOVE_MASK  0x000F
+#define EXT2_EXTENT_ROOT       0x0001
+#define EXT2_EXTENT_LAST_LEAF  0x0002
+#define EXT2_EXTENT_FIRST_SIB  0x0003
+#define EXT2_EXTENT_LAST_SIB   0x0004
+#define EXT2_EXTENT_NEXT_SIB   0x0005
+#define EXT2_EXTENT_PREV_SIB   0x0006
+#define EXT2_EXTENT_NEXT_LEAF  0x0007
+#define EXT2_EXTENT_PREV_LEAF  0x0008
+#define EXT2_EXTENT_NEXT       0x0009
+#define EXT2_EXTENT_PREV       0x000A
+#define EXT2_EXTENT_UP         0x000B
+#define EXT2_EXTENT_DOWN       0x000C
+#define EXT2_EXTENT_DOWN_AND_LAST 0x000D
+
+/*
+ * Flags used by ext2fs_extent_insert()
+ */
+
+#define EXT2_EXTENT_INSERT_AFTER  0x0001
+
+/*
+ * Data structure returned by ext2fs_extent_get_info()
+ */
+struct ext2_extent_info {
+       int             curr_entry;
+       int             curr_level;
+       int             num_entries;
+       int             max_entries;
+       int             max_depth;
+       int             bytes_avail;
+       blk64_t         max_lblk;
+       blk64_t         max_pblk;
+       __u32           max_len;
+       __u32           max_uninit_len;
+};
+
+/*
  * Flags for directory block reading and writing functions
  */
 #define EXT2_DIRBLOCK_V2_STRUCT        0x0001
@@ -722,6 +781,22 @@ extern errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
                                           char *block_buf,
                                           int adjust, __u32 *newcount);
 
+/* extent.c */
+extern errcode_t ext2fs_extent_header_verify(void *ptr, int size);
+extern errcode_t ext2fs_extent_open(ext2_filsys fs, ext2_ino_t ino,
+                                   ext2_extent_handle_t *handle);
+extern errcode_t ext2fs_extent_get(ext2_extent_handle_t handle,
+                                  int flags, struct ext2fs_extent *extent);
+extern errcode_t ext2fs_extent_replace(ext2_extent_handle_t handle, int flags,
+                                      struct ext2fs_extent *extent);
+extern errcode_t ext2fs_extent_insert(ext2_extent_handle_t handle, int flags,
+                                     struct ext2fs_extent *extent);
+extern errcode_t ext2fs_extent_delete(ext2_extent_handle_t handle, int flags);
+extern errcode_t ext2fs_extent_get_info(ext2_extent_handle_t handle,
+                                       struct ext2_extent_info *info);
+extern errcode_t ext2fs_extent_goto(ext2_extent_handle_t handle,
+                                   blk64_t blk);
+
 /* fileio.c */
 extern errcode_t ext2fs_file_open2(ext2_filsys fs, ext2_ino_t ino,
                                   struct ext2_inode *inode,