summaryrefslogtreecommitdiffstats
path: root/fs/btrfs/extent_map.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/extent_map.h')
-rw-r--r--fs/btrfs/extent_map.h77
1 files changed, 52 insertions, 25 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 35d27c756e..e380fc08bb 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -5,30 +5,33 @@
#include <linux/rbtree.h>
#include <linux/refcount.h>
+#include "compression.h"
#define EXTENT_MAP_LAST_BYTE ((u64)-4)
#define EXTENT_MAP_HOLE ((u64)-3)
#define EXTENT_MAP_INLINE ((u64)-2)
-/* used only during fiemap calls */
-#define EXTENT_MAP_DELALLOC ((u64)-1)
/* bits for the extent_map::flags field */
enum {
/* this entry not yet on disk, don't free it */
- EXTENT_FLAG_PINNED,
- EXTENT_FLAG_COMPRESSED,
+ ENUM_BIT(EXTENT_FLAG_PINNED),
+ ENUM_BIT(EXTENT_FLAG_COMPRESS_ZLIB),
+ ENUM_BIT(EXTENT_FLAG_COMPRESS_LZO),
+ ENUM_BIT(EXTENT_FLAG_COMPRESS_ZSTD),
/* pre-allocated extent */
- EXTENT_FLAG_PREALLOC,
+ ENUM_BIT(EXTENT_FLAG_PREALLOC),
/* Logging this extent */
- EXTENT_FLAG_LOGGING,
+ ENUM_BIT(EXTENT_FLAG_LOGGING),
/* Filling in a preallocated extent */
- EXTENT_FLAG_FILLING,
- /* filesystem extent mapping type */
- EXTENT_FLAG_FS_MAPPING,
+ ENUM_BIT(EXTENT_FLAG_FILLING),
/* This em is merged from two or more physically adjacent ems */
- EXTENT_FLAG_MERGED,
+ ENUM_BIT(EXTENT_FLAG_MERGED),
};
+/*
+ * Keep this structure as compact as possible, as we can have really large
+ * amounts of allocated extent maps at any time.
+ */
struct extent_map {
struct rb_node rb_node;
@@ -49,11 +52,8 @@ struct extent_map {
* For non-merged extents, it's from btrfs_file_extent_item::generation.
*/
u64 generation;
- unsigned long flags;
- /* Used for chunk mappings, flag EXTENT_FLAG_FS_MAPPING must be set */
- struct map_lookup *map_lookup;
+ u32 flags;
refcount_t refs;
- unsigned int compress_type;
struct list_head list;
};
@@ -65,30 +65,57 @@ struct extent_map_tree {
struct btrfs_inode;
+static inline void extent_map_set_compression(struct extent_map *em,
+ enum btrfs_compression_type type)
+{
+ if (type == BTRFS_COMPRESS_ZLIB)
+ em->flags |= EXTENT_FLAG_COMPRESS_ZLIB;
+ else if (type == BTRFS_COMPRESS_LZO)
+ em->flags |= EXTENT_FLAG_COMPRESS_LZO;
+ else if (type == BTRFS_COMPRESS_ZSTD)
+ em->flags |= EXTENT_FLAG_COMPRESS_ZSTD;
+}
+
+static inline enum btrfs_compression_type extent_map_compression(const struct extent_map *em)
+{
+ if (em->flags & EXTENT_FLAG_COMPRESS_ZLIB)
+ return BTRFS_COMPRESS_ZLIB;
+
+ if (em->flags & EXTENT_FLAG_COMPRESS_LZO)
+ return BTRFS_COMPRESS_LZO;
+
+ if (em->flags & EXTENT_FLAG_COMPRESS_ZSTD)
+ return BTRFS_COMPRESS_ZSTD;
+
+ return BTRFS_COMPRESS_NONE;
+}
+
+/*
+ * More efficient way to determine if extent is compressed, instead of using
+ * 'extent_map_compression() != BTRFS_COMPRESS_NONE'.
+ */
+static inline bool extent_map_is_compressed(const struct extent_map *em)
+{
+ return (em->flags & (EXTENT_FLAG_COMPRESS_ZLIB |
+ EXTENT_FLAG_COMPRESS_LZO |
+ EXTENT_FLAG_COMPRESS_ZSTD)) != 0;
+}
+
static inline int extent_map_in_tree(const struct extent_map *em)
{
return !RB_EMPTY_NODE(&em->rb_node);
}
-static inline u64 extent_map_end(struct extent_map *em)
+static inline u64 extent_map_end(const struct extent_map *em)
{
if (em->start + em->len < em->start)
return (u64)-1;
return em->start + em->len;
}
-static inline u64 extent_map_block_end(struct extent_map *em)
-{
- if (em->block_start + em->block_len < em->block_start)
- return (u64)-1;
- return em->block_start + em->block_len;
-}
-
void extent_map_tree_init(struct extent_map_tree *tree);
struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
u64 start, u64 len);
-int add_extent_mapping(struct extent_map_tree *tree,
- struct extent_map *em, int modified);
void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre,
u64 new_logical);
@@ -97,7 +124,7 @@ struct extent_map *alloc_extent_map(void);
void free_extent_map(struct extent_map *em);
int __init extent_map_init(void);
void __cold extent_map_exit(void);
-int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len, u64 gen);
+int unpin_extent_cache(struct btrfs_inode *inode, u64 start, u64 len, u64 gen);
void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em);
struct extent_map *search_extent_mapping(struct extent_map_tree *tree,
u64 start, u64 len);