/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BTRFS_EXTENT_IO_TREE_H
#define BTRFS_EXTENT_IO_TREE_H
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/refcount.h>
#include <linux/list.h>
#include <linux/wait.h>
#include "misc.h"
struct extent_changeset;
struct btrfs_fs_info;
struct btrfs_inode;
/* Bits for the extent state */
enum {
ENUM_BIT(EXTENT_DIRTY),
ENUM_BIT(EXTENT_UPTODATE),
ENUM_BIT(EXTENT_LOCKED),
ENUM_BIT(EXTENT_DIO_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)
#define EXTENT_LOCK_BITS (EXTENT_LOCKED | EXTENT_DIO_LOCKED)
/*
* 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;
/*
* The fs_info is needed for trace points, a tree attached to an inode
* needs the inode.
*
* owner == IO_TREE_INODE_IO - then inode is valid and fs_info can be
* accessed as inode->root->fs_info
*/
union {
struct btrfs_fs_info *fs_info;
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
};
struct btrfs_inode *extent_io_tree_to_inode(struct extent_io_tree *tree);
const struct btrfs_inode *extent_io_tree_to_inode_const(const struct extent_io_tree *tree);
const struct btrfs_fs_info *extent_io_tree_to_fs_info(const struct extent_io_tree *tree);
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, u32 bits,
struct extent_state **cached);
bool __try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
struct extent_state **cached);
static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached)
{
return __lock_extent(tree, start, end, EXTENT_LOCKED, cached);
}
static inline bool try_lock_extent(struct extent_io_tree *tree, u64 start,
u64 end, struct extent_state **cached)
{
return __try_lock_extent(tree, start, end, EXTENT_LOCKED, 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);
bool test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bit,
struct extent_state *cached_state);
bool test_range_bit_exists(struct extent_io_tree *tree, u64 start, u64 end, u32 bit);
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);
static inline int lock_dio_extent(struct extent_io_tree *tree, u64 start,
u64 end, struct extent_state **cached)
{
return __lock_extent(tree, start, end, EXTENT_DIO_LOCKED, cached);
}
static inline bool try_lock_dio_extent(struct extent_io_tree *tree, u64 start,
u64 end, struct extent_state **cached)
{
return __try_lock_extent(tree, start, end, EXTENT_DIO_LOCKED, cached);
}
static inline int unlock_dio_extent(struct extent_io_tree *tree, u64 start,
u64 end, struct extent_state **cached)
{
return __clear_extent_bit(tree, start, end, EXTENT_DIO_LOCKED, cached, NULL);
}
#endif /* BTRFS_EXTENT_IO_TREE_H */
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