ordered-data.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 */

#ifndef BTRFS_ORDERED_DATA_H
#define BTRFS_ORDERED_DATA_H

/* one of these per inode */
struct btrfs_ordered_inode_tree {
	spinlock_t lock;
	struct rb_root tree;
	struct rb_node *last;
};

struct btrfs_ordered_sum {
	/* bytenr is the start of this extent on disk */
	u64 bytenr;

	/*
	 * this is the length in bytes covered by the sums array below.
	 */
	int len;
	struct list_head list;
	/* last field is a variable length array of csums */
	u8 sums[];
};

/*
 * bits for the flags field:
 *
 * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
 * It is used to make sure metadata is inserted into the tree only once
 * per extent.
 *
 * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
 * rbtree, just before waking any waiters.  It is used to indicate the
 * IO is done and any metadata is inserted into the tree.
 */
enum {
	/* set when all the pages are written */
	BTRFS_ORDERED_IO_DONE,
	/* set when removed from the tree */
	BTRFS_ORDERED_COMPLETE,
	/* set when we want to write in place */
	BTRFS_ORDERED_NOCOW,
	/* writing a zlib compressed extent */
	BTRFS_ORDERED_COMPRESSED,
	/* set when writing to preallocated extent */
	BTRFS_ORDERED_PREALLOC,
	/* set when we're doing DIO with this extent */
	BTRFS_ORDERED_DIRECT,
	/* We had an io error when writing this out */
	BTRFS_ORDERED_IOERR,
	/* Set when we have to truncate an extent */
	BTRFS_ORDERED_TRUNCATED,
	/* Regular IO for COW */
	BTRFS_ORDERED_REGULAR,
};

struct btrfs_ordered_extent {
	/* logical offset in the file */
	u64 file_offset;

	/*
	 * These fields directly correspond to the same fields in
	 * btrfs_file_extent_item.
	 */
	u64 disk_bytenr;
	u64 num_bytes;
	u64 disk_num_bytes;

	/* number of bytes that still need writing */
	u64 bytes_left;

	/*
	 * the end of the ordered extent which is behind it but
	 * didn't update disk_i_size. Please see the comment of
	 * btrfs_ordered_update_i_size();
	 */
	u64 outstanding_isize;

	/*
	 * If we get truncated we need to adjust the file extent we enter for
	 * this ordered extent so that we do not expose stale data.
	 */
	u64 truncated_len;

	/* flags (described above) */
	unsigned long flags;

	/* compression algorithm */
	int compress_type;

	/* Qgroup reserved space */
	int qgroup_rsv;

	/* reference count */
	refcount_t refs;

	/* the inode we belong to */
	struct inode *inode;

	/* list of checksums for insertion when the extent io is done */
	struct list_head list;

	/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
	wait_queue_head_t wait;

	/* our friendly rbtree entry */
	struct rb_node rb_node;

	/* a per root list of all the pending ordered extents */
	struct list_head root_extent_list;

	struct btrfs_work work;

	struct completion completion;
	struct btrfs_work flush_work;
	struct list_head work_list;
};

/*
 * calculates the total size you need to allocate for an ordered sum
 * structure spanning 'bytes' in the file
 */
static inline int btrfs_ordered_sum_size(struct btrfs_fs_info *fs_info,
					 unsigned long bytes)
{
	int num_sectors = (int)DIV_ROUND_UP(bytes, fs_info->sectorsize);
	int csum_size = btrfs_super_csum_size(fs_info->super_copy);

	return sizeof(struct btrfs_ordered_sum) + num_sectors * csum_size;
}

static inline void
btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
{
	spin_lock_init(&t->lock);
	t->tree = RB_ROOT;
	t->last = NULL;
}

void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
void btrfs_remove_ordered_extent(struct inode *inode,
				struct btrfs_ordered_extent *entry);
int btrfs_dec_test_ordered_pending(struct inode *inode,
				   struct btrfs_ordered_extent **cached,
				   u64 file_offset, u64 io_size, int uptodate);
int btrfs_dec_test_first_ordered_pending(struct btrfs_inode *inode,
				   struct btrfs_ordered_extent **cached,
				   u64 *file_offset, u64 io_size,
				   int uptodate);
int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
			     u64 disk_bytenr, u64 num_bytes, u64 disk_num_bytes,
			     int type);
int btrfs_add_ordered_extent_dio(struct btrfs_inode *inode, u64 file_offset,
				 u64 disk_bytenr, u64 num_bytes,
				 u64 disk_num_bytes, int type);
int btrfs_add_ordered_extent_compress(struct btrfs_inode *inode, u64 file_offset,
				      u64 disk_bytenr, u64 num_bytes,
				      u64 disk_num_bytes, int type,
				      int compress_type);
void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry,
			   struct btrfs_ordered_sum *sum);
struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode,
							 u64 file_offset);
void btrfs_start_ordered_extent(struct inode *inode,
				struct btrfs_ordered_extent *entry, int wait);
int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
struct btrfs_ordered_extent *
btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
		struct btrfs_inode *inode,
		u64 file_offset,
		u64 len);
int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr,
			   u8 *sum, int len);
u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
			       const u64 range_start, const u64 range_len);
void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
			      const u64 range_start, const u64 range_len);
void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start,
					u64 end,
					struct extent_state **cached_state);
int __init ordered_data_init(void);
void __cold ordered_data_exit(void);

#endif