X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=extent_io.h;h=17a4a829863587222d677197d5c682ebfc05c28b;hb=c074434fb5f0874dcf8523191359976b668527f8;hp=5df44f7de588853c27664499aadd1335dea60565;hpb=4d48b96b280a76f29eb5d5f1578559932f551b2d;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/extent_io.h b/extent_io.h
index 5df44f7..17a4a82 100644
--- a/extent_io.h
+++ b/extent_io.h
@@ -16,29 +16,66 @@
  * Boston, MA 021110-1307, USA.
  */
 
-#ifndef __EXTENTMAP__
-#define __EXTENTMAP__
+#ifndef __BTRFS_EXTENT_IO_H__
+#define __BTRFS_EXTENT_IO_H__
+
+#if BTRFS_FLAT_INCLUDES
 #include "kerncompat.h"
 #include "extent-cache.h"
 #include "list.h"
+#else
+#include <btrfs/kerncompat.h>
+#include <btrfs/extent-cache.h>
+#include <btrfs/list.h>
+#endif /* BTRFS_FLAT_INCLUDES */
 
-#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_DEFRAG (1 << 6)
-#define EXTENT_DEFRAG_DONE (1 << 7)
-#define EXTENT_BUFFER_FILLED (1 << 8)
-#define EXTENT_CSUM (1 << 9)
+#define EXTENT_DIRTY		(1U << 0)
+#define EXTENT_WRITEBACK	(1U << 1)
+#define EXTENT_UPTODATE		(1U << 2)
+#define EXTENT_LOCKED		(1U << 3)
+#define EXTENT_NEW		(1U << 4)
+#define EXTENT_DELALLOC		(1U << 5)
+#define EXTENT_DEFRAG		(1U << 6)
+#define EXTENT_DEFRAG_DONE	(1U << 7)
+#define EXTENT_BUFFER_FILLED	(1U << 8)
+#define EXTENT_CSUM		(1U << 9)
+#define EXTENT_BAD_TRANSID	(1U << 10)
+#define EXTENT_BUFFER_DUMMY	(1U << 11)
 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
 
+#define BLOCK_GROUP_DATA	(1U << 1)
+#define BLOCK_GROUP_METADATA	(1U << 2)
+#define BLOCK_GROUP_SYSTEM	(1U << 4)
+
+#define BLOCK_GROUP_DIRTY 	(1U)
+
+/*
+ * The extent buffer bitmap operations are done with byte granularity instead of
+ * word granularity for two reasons:
+ * 1. The bitmaps must be little-endian on disk.
+ * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
+ *    single word in a bitmap may straddle two pages in the extent buffer.
+ */
+#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
+#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
+#define BITMAP_FIRST_BYTE_MASK(start) \
+	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
+#define BITMAP_LAST_BYTE_MASK(nbits) \
+	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
+
+static inline int le_test_bit(int nr, const u8 *addr)
+{
+	return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
+}
+
+struct btrfs_fs_info;
+
 struct extent_io_tree {
 	struct cache_tree state;
 	struct cache_tree cache;
 	struct list_head lru;
 	u64 cache_size;
+	u64 max_cache_size;
 };
 
 struct extent_state {
@@ -47,7 +84,7 @@ struct extent_state {
 	u64 end;
 	int refs;
 	unsigned long state;
-	u64 private;
+	u64 xprivate;
 };
 
 struct extent_buffer {
@@ -57,10 +94,11 @@ struct extent_buffer {
 	u32 len;
 	struct extent_io_tree *tree;
 	struct list_head lru;
+	struct list_head recow;
 	int refs;
-	int flags;
+	u32 flags;
 	int fd;
-	char data[];
+	char data[] __attribute__((aligned(8)));
 };
 
 static inline void extent_buffer_get(struct extent_buffer *eb)
@@ -69,32 +107,49 @@ static inline void extent_buffer_get(struct extent_buffer *eb)
 }
 
 void extent_io_tree_init(struct extent_io_tree *tree);
+void extent_io_tree_init_cache_max(struct extent_io_tree *tree,
+				   u64 max_cache_size);
 void extent_io_tree_cleanup(struct extent_io_tree *tree);
-int set_extent_bits(struct extent_io_tree *tree, u64 start,
-		    u64 end, int bits, gfp_t mask);
-int clear_extent_bits(struct extent_io_tree *tree, u64 start,
-		      u64 end, int bits, gfp_t mask);
+int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
+int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
 			  u64 *start_ret, u64 *end_ret, int bits);
 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
 		   int bits, int filled);
-int set_extent_dirty(struct extent_io_tree *tree, u64 start,
-		     u64 end, gfp_t mask);
-int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
-		       u64 end, gfp_t mask);
-int extent_buffer_uptodate(struct extent_buffer *eb);
-int set_extent_buffer_uptodate(struct extent_buffer *eb);
-int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
-				struct extent_buffer *eb);
-int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
-int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
+int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
+int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
+static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
+{
+	eb->flags |= EXTENT_UPTODATE;
+	return 0;
+}
+
+static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
+{
+	eb->flags &= ~EXTENT_UPTODATE;
+	return 0;
+}
+
+static inline int extent_buffer_uptodate(struct extent_buffer *eb)
+{
+	if (!eb || IS_ERR(eb))
+		return 0;
+	if (eb->flags & EXTENT_UPTODATE)
+		return 1;
+	return 0;
+}
+
+int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
+int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
 struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
 					 u64 bytenr, u32 blocksize);
 struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
 					       u64 start);
 struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
 					  u64 bytenr, u32 blocksize);
+struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
 void free_extent_buffer(struct extent_buffer *eb);
+void free_extent_buffer_nocache(struct extent_buffer *eb);
 int read_extent_from_disk(struct extent_buffer *eb,
 			  unsigned long offset, unsigned long len);
 int write_extent_to_disk(struct extent_buffer *eb);
@@ -107,12 +162,16 @@ void write_extent_buffer(struct extent_buffer *eb, const void *src,
 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 extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
+			   unsigned long nr);
 int set_extent_buffer_dirty(struct extent_buffer *eb);
 int clear_extent_buffer_dirty(struct extent_buffer *eb);
+int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
+			u64 bytes, int mirror);
+int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
+		       u64 bytes, int mirror);
 #endif