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-rw-r--r--fs/btrfs/extent-io-tree.h198
1 files changed, 198 insertions, 0 deletions
diff --git a/fs/btrfs/extent-io-tree.h b/fs/btrfs/extent-io-tree.h
new file mode 100644
index 000000000..28c23a23d
--- /dev/null
+++ b/fs/btrfs/extent-io-tree.h
@@ -0,0 +1,198 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef BTRFS_EXTENT_IO_TREE_H
+#define BTRFS_EXTENT_IO_TREE_H
+
+#include "misc.h"
+
+struct extent_changeset;
+
+/* Bits for the extent state */
+enum {
+ ENUM_BIT(EXTENT_DIRTY),
+ ENUM_BIT(EXTENT_UPTODATE),
+ ENUM_BIT(EXTENT_LOCKED),
+ ENUM_BIT(EXTENT_NEW),
+ ENUM_BIT(EXTENT_DELALLOC),
+ ENUM_BIT(EXTENT_DEFRAG),
+ ENUM_BIT(EXTENT_BOUNDARY),
+ ENUM_BIT(EXTENT_NODATASUM),
+ ENUM_BIT(EXTENT_CLEAR_META_RESV),
+ ENUM_BIT(EXTENT_NEED_WAIT),
+ ENUM_BIT(EXTENT_NORESERVE),
+ ENUM_BIT(EXTENT_QGROUP_RESERVED),
+ ENUM_BIT(EXTENT_CLEAR_DATA_RESV),
+ /*
+ * Must be cleared only during ordered extent completion or on error
+ * paths if we did not manage to submit bios and create the ordered
+ * extents for the range. Should not be cleared during page release
+ * and page invalidation (if there is an ordered extent in flight),
+ * that is left for the ordered extent completion.
+ */
+ ENUM_BIT(EXTENT_DELALLOC_NEW),
+ /*
+ * When an ordered extent successfully completes for a region marked as
+ * a new delalloc range, use this flag when clearing a new delalloc
+ * range to indicate that the VFS' inode number of bytes should be
+ * incremented and the inode's new delalloc bytes decremented, in an
+ * atomic way to prevent races with stat(2).
+ */
+ ENUM_BIT(EXTENT_ADD_INODE_BYTES),
+ /*
+ * Set during truncate when we're clearing an entire range and we just
+ * want the extent states to go away.
+ */
+ ENUM_BIT(EXTENT_CLEAR_ALL_BITS),
+
+ /*
+ * This must be last.
+ *
+ * Bit not representing a state but a request for NOWAIT semantics,
+ * e.g. when allocating memory, and must be masked out from the other
+ * bits.
+ */
+ ENUM_BIT(EXTENT_NOWAIT)
+};
+
+#define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
+ EXTENT_CLEAR_DATA_RESV)
+#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | \
+ EXTENT_ADD_INODE_BYTES | \
+ EXTENT_CLEAR_ALL_BITS)
+
+/*
+ * Redefined bits above which are used only in the device allocation tree,
+ * shouldn't be using EXTENT_LOCKED / EXTENT_BOUNDARY / EXTENT_CLEAR_META_RESV
+ * / EXTENT_CLEAR_DATA_RESV because they have special meaning to the bit
+ * manipulation functions
+ */
+#define CHUNK_ALLOCATED EXTENT_DIRTY
+#define CHUNK_TRIMMED EXTENT_DEFRAG
+#define CHUNK_STATE_MASK (CHUNK_ALLOCATED | \
+ CHUNK_TRIMMED)
+
+enum {
+ IO_TREE_FS_PINNED_EXTENTS,
+ IO_TREE_FS_EXCLUDED_EXTENTS,
+ IO_TREE_BTREE_INODE_IO,
+ IO_TREE_INODE_IO,
+ IO_TREE_RELOC_BLOCKS,
+ IO_TREE_TRANS_DIRTY_PAGES,
+ IO_TREE_ROOT_DIRTY_LOG_PAGES,
+ IO_TREE_INODE_FILE_EXTENT,
+ IO_TREE_LOG_CSUM_RANGE,
+ IO_TREE_SELFTEST,
+ IO_TREE_DEVICE_ALLOC_STATE,
+};
+
+struct extent_io_tree {
+ struct rb_root state;
+ struct btrfs_fs_info *fs_info;
+ /* Inode associated with this tree, or NULL. */
+ struct btrfs_inode *inode;
+
+ /* Who owns this io tree, should be one of IO_TREE_* */
+ u8 owner;
+
+ spinlock_t lock;
+};
+
+struct extent_state {
+ u64 start;
+ u64 end; /* inclusive */
+ struct rb_node rb_node;
+
+ /* ADD NEW ELEMENTS AFTER THIS */
+ wait_queue_head_t wq;
+ refcount_t refs;
+ u32 state;
+
+#ifdef CONFIG_BTRFS_DEBUG
+ struct list_head leak_list;
+#endif
+};
+
+void extent_io_tree_init(struct btrfs_fs_info *fs_info,
+ struct extent_io_tree *tree, unsigned int owner);
+void extent_io_tree_release(struct extent_io_tree *tree);
+
+int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
+ struct extent_state **cached);
+
+int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
+ struct extent_state **cached);
+
+int __init extent_state_init_cachep(void);
+void __cold extent_state_free_cachep(void);
+
+u64 count_range_bits(struct extent_io_tree *tree,
+ u64 *start, u64 search_end,
+ u64 max_bytes, u32 bits, int contig,
+ struct extent_state **cached_state);
+
+void free_extent_state(struct extent_state *state);
+int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, int filled, struct extent_state *cached_state);
+int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, struct extent_changeset *changeset);
+int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, struct extent_state **cached,
+ struct extent_changeset *changeset);
+
+static inline int clear_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 end, u32 bits,
+ struct extent_state **cached)
+{
+ return __clear_extent_bit(tree, start, end, bits, cached, NULL);
+}
+
+static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end,
+ struct extent_state **cached)
+{
+ return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, cached, NULL);
+}
+
+static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
+ u64 end, u32 bits)
+{
+ return clear_extent_bit(tree, start, end, bits, NULL);
+}
+
+int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, struct extent_changeset *changeset);
+int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, struct extent_state **cached_state);
+
+static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
+ u64 end, struct extent_state **cached_state)
+{
+ return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE,
+ cached_state, NULL);
+}
+
+static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
+ u64 end, struct extent_state **cached)
+{
+ return clear_extent_bit(tree, start, end,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, cached);
+}
+
+int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, u32 clear_bits,
+ struct extent_state **cached_state);
+
+bool find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, u32 bits,
+ struct extent_state **cached_state);
+void find_first_clear_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, u32 bits);
+int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, u32 bits);
+bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
+ u64 *end, u64 max_bytes,
+ struct extent_state **cached_state);
+void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
+ struct extent_state **cached_state);
+
+#endif /* BTRFS_EXTENT_IO_TREE_H */