* 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 <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_BAD_TRANSID (1 << 10)
-#define EXTENT_BUFFER_DUMMY (1 << 11)
+#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 EXTENT_WRITEBACK
-#define BLOCK_GROUP_METADATA EXTENT_UPTODATE
-#define BLOCK_GROUP_SYSTEM EXTENT_NEW
+#define BLOCK_GROUP_DATA (1U << 1)
+#define BLOCK_GROUP_METADATA (1U << 2)
+#define BLOCK_GROUP_SYSTEM (1U << 4)
-#define BLOCK_GROUP_DIRTY EXTENT_DIRTY
+#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 cache_tree cache;
struct list_head lru;
u64 cache_size;
+ u64 max_cache_size;
};
struct extent_state {
struct cache_extent cache_node;
u64 start;
u64 dev_bytenr;
- u32 len;
struct extent_io_tree *tree;
struct list_head lru;
struct list_head recow;
+ u32 len;
int refs;
- int flags;
+ u32 flags;
int fd;
- char data[];
+ struct btrfs_fs_info *fs_info;
+ char data[] __attribute__((aligned(8)));
};
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_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,
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
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);
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,
projects / platform / upstream / btrfs-progs.git / blobdiff