Btrfs: Stop using radix trees for the block group cache

[karo-tx-linux.git] / fs / btrfs / extent_map.h

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 108944aab4bd270e0798e397d3aa522390d6e368..5a63b417034a305fd8b452ddc2303ba36739d458 100644 (file)
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -3,14 +3,34 @@
 
 #include <linux/rbtree.h>
 
+#define EXTENT_MAP_HOLE (u64)-3
 #define EXTENT_MAP_INLINE (u64)-2
 #define EXTENT_MAP_DELALLOC (u64)-1
 
+/* bits for the extent state */
+#define EXTENT_DIRTY 1
+#define EXTENT_WRITEBACK (1 << 1)
+#define EXTENT_UPTODATE (1 << 2)
+#define EXTENT_LOCKED (1 << 3)
+#define EXTENT_NEW (1 << 4)
+#define EXTENT_DELALLOC (1 << 5)
+#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
+
+
+struct extent_map_ops {
+       int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
+       int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
+       int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
+       int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
+       void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
+};
+
 struct extent_map_tree {
        struct rb_root map;
        struct rb_root state;
        struct address_space *mapping;
        rwlock_t lock;
+       struct extent_map_ops *ops;
 };
 
 /* note, this must start with the same fields as fs/extent_map.c:tree_entry */
@@ -35,14 +55,22 @@ struct extent_state {
        wait_queue_head_t wq;
        atomic_t refs;
        unsigned long state;
+
+       /* for use by the FS */
+       u64 private;
+
        struct list_head list;
 };
 
 struct extent_buffer {
        u64 start;
-       u64 end; /* inclusive */
-       char *addr;
-       struct page *pages[];
+       unsigned long len;
+       atomic_t refs;
+       int flags;
+       struct list_head list;
+       struct list_head leak_list;
+       struct page *first_page;
+       unsigned long alloc_addr;
 };
 
 typedef struct extent_map *(get_extent_t)(struct inode *inode,
@@ -68,12 +96,22 @@ int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
 void __init extent_map_init(void);
 void __exit extent_map_exit(void);
 int extent_clean_all_trees(struct extent_map_tree *tree);
+int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
+                     int bits, gfp_t mask);
+int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
+                   int bits, gfp_t mask);
 int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
                        gfp_t mask);
 int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
                   gfp_t mask);
 int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
                     gfp_t mask);
+int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
+                      gfp_t mask);
+int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
+                    gfp_t mask);
+int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
+                         u64 *start_ret, u64 *end_ret, int bits);
 int extent_invalidatepage(struct extent_map_tree *tree,
                          struct page *page, unsigned long offset);
 int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
@@ -85,5 +123,63 @@ int extent_prepare_write(struct extent_map_tree *tree,
 int extent_commit_write(struct extent_map_tree *tree,
                        struct inode *inode, struct page *page,
                        unsigned from, unsigned to);
+sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
+               get_extent_t *get_extent);
 int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
+int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
+int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
+void set_page_extent_mapped(struct page *page);
+
+struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
+                                         u64 start, unsigned long len,
+                                         gfp_t mask);
+struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
+                                        u64 start, unsigned long len,
+                                         gfp_t mask);
+void free_extent_buffer(struct extent_buffer *eb);
+int read_extent_buffer_pages(struct extent_map_tree *tree,
+                            struct extent_buffer *eb, int wait);
+
+static inline void extent_buffer_get(struct extent_buffer *eb)
+{
+       atomic_inc(&eb->refs);
+}
+
+static inline u64 extent_buffer_blocknr(struct extent_buffer *eb)
+{
+       return eb->start / 4096;
+}
+
+int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
+                         unsigned long start,
+                         unsigned long len);
+void read_extent_buffer(struct extent_buffer *eb, void *dst,
+                       unsigned long start,
+                       unsigned long len);
+void write_extent_buffer(struct extent_buffer *eb, const void *src,
+                        unsigned long start, unsigned long len);
+void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
+                       unsigned long dst_offset, unsigned long src_offset,
+                       unsigned long len);
+void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
+                          unsigned long src_offset, unsigned long len);
+void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
+                          unsigned long src_offset, unsigned long len);
+void memset_extent_buffer(struct extent_buffer *eb, char c,
+                         unsigned long start, unsigned long len);
+int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
+                                   struct extent_buffer *eb);
+int clear_extent_buffer_dirty(struct extent_map_tree *tree,
+                             struct extent_buffer *eb);
+int set_extent_buffer_dirty(struct extent_map_tree *tree,
+                            struct extent_buffer *eb);
+int set_extent_buffer_uptodate(struct extent_map_tree *tree,
+                              struct extent_buffer *eb);
+int extent_buffer_uptodate(struct extent_map_tree *tree,
+                          struct extent_buffer *eb);
+int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
+                     unsigned long min_len, char **token, char **map,
+                     unsigned long *map_start,
+                     unsigned long *map_len, int km);
+void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
 #endif