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authorChris Mason <chris.mason@oracle.com>2007-08-27 16:49:44 -0400
committerDavid Woodhouse <dwmw2@hera.kernel.org>2007-08-27 16:49:44 -0400
commita52d9a8033c454cd9b4697cfafb467509fc1693f (patch)
tree83d8bbf2df29598ea9c60498fadf5990262a11c8 /fs/btrfs/extent_map.h
parent83df7c1d8b885e216c68c3f0469bec9b93666b74 (diff)
Btrfs: Extent based page cache code. This uses an rbtree of extents and tests
instead of buffer heads. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_map.h')
-rw-r--r--fs/btrfs/extent_map.h89
1 files changed, 89 insertions, 0 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
new file mode 100644
index 00000000000..108944aab4b
--- /dev/null
+++ b/fs/btrfs/extent_map.h
@@ -0,0 +1,89 @@
+#ifndef __EXTENTMAP__
+#define __EXTENTMAP__
+
+#include <linux/rbtree.h>
+
+#define EXTENT_MAP_INLINE (u64)-2
+#define EXTENT_MAP_DELALLOC (u64)-1
+
+struct extent_map_tree {
+ struct rb_root map;
+ struct rb_root state;
+ struct address_space *mapping;
+ rwlock_t lock;
+};
+
+/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
+struct extent_map {
+ u64 start;
+ u64 end; /* inclusive */
+ int in_tree;
+ struct rb_node rb_node;
+ /* block_start and block_end are in bytes */
+ u64 block_start;
+ u64 block_end; /* inclusive */
+ struct block_device *bdev;
+ atomic_t refs;
+};
+
+/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
+struct extent_state {
+ u64 start;
+ u64 end; /* inclusive */
+ int in_tree;
+ struct rb_node rb_node;
+ wait_queue_head_t wq;
+ atomic_t refs;
+ unsigned long state;
+ struct list_head list;
+};
+
+struct extent_buffer {
+ u64 start;
+ u64 end; /* inclusive */
+ char *addr;
+ struct page *pages[];
+};
+
+typedef struct extent_map *(get_extent_t)(struct inode *inode,
+ struct page *page,
+ size_t page_offset,
+ u64 start, u64 end,
+ int create);
+
+void extent_map_tree_init(struct extent_map_tree *tree,
+ struct address_space *mapping, gfp_t mask);
+struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
+ u64 start, u64 end);
+int add_extent_mapping(struct extent_map_tree *tree,
+ struct extent_map *em);
+int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
+int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
+int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
+int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
+struct extent_map *alloc_extent_map(gfp_t mask);
+void free_extent_map(struct extent_map *em);
+int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
+ get_extent_t *get_extent);
+void __init extent_map_init(void);
+void __exit extent_map_exit(void);
+int extent_clean_all_trees(struct extent_map_tree *tree);
+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 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,
+ get_extent_t *get_extent,
+ struct writeback_control *wbc);
+int extent_prepare_write(struct extent_map_tree *tree,
+ struct inode *inode, struct page *page,
+ unsigned from, unsigned to, get_extent_t *get_extent);
+int extent_commit_write(struct extent_map_tree *tree,
+ struct inode *inode, struct page *page,
+ unsigned from, unsigned to);
+int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
+#endif