ordered-data.h 6.3 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 */

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

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

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

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/*
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 * Bits for btrfs_ordered_extent::flags.
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 *
 * 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.
 */
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enum {
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	/*
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	 * Different types for ordered extents, one and only one of the 4 types
	 * need to be set when creating ordered extent.
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	 *
	 * REGULAR:	For regular non-compressed COW write
	 * NOCOW:	For NOCOW write into existing non-hole extent
	 * PREALLOC:	For NOCOW write into preallocated extent
	 * COMPRESSED:	For compressed COW write
	 */
	BTRFS_ORDERED_REGULAR,
	BTRFS_ORDERED_NOCOW,
	BTRFS_ORDERED_PREALLOC,
	BTRFS_ORDERED_COMPRESSED,

	/*
	 * Extra bit for direct io, can only be set for
	 * REGULAR/NOCOW/PREALLOC. No direct io for compressed extent.
	 */
	BTRFS_ORDERED_DIRECT,

	/* Extra status bits for ordered extents */

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	/* set when all the pages are written */
	BTRFS_ORDERED_IO_DONE,
	/* set when removed from the tree */
	BTRFS_ORDERED_COMPLETE,
	/* We had an io error when writing this out */
	BTRFS_ORDERED_IOERR,
	/* Set when we have to truncate an extent */
	BTRFS_ORDERED_TRUNCATED,
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	/* Used during fsync to track already logged extents */
	BTRFS_ORDERED_LOGGED,
	/* We have already logged all the csums of the ordered extent */
	BTRFS_ORDERED_LOGGED_CSUM,
	/* We wait for this extent to complete in the current transaction */
	BTRFS_ORDERED_PENDING,
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	/* BTRFS_IOC_ENCODED_WRITE */
	BTRFS_ORDERED_ENCODED,
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};
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/* BTRFS_ORDERED_* flags that specify the type of the extent. */
#define BTRFS_ORDERED_TYPE_FLAGS ((1UL << BTRFS_ORDERED_REGULAR) |	\
				  (1UL << BTRFS_ORDERED_NOCOW) |	\
				  (1UL << BTRFS_ORDERED_PREALLOC) |	\
				  (1UL << BTRFS_ORDERED_COMPRESSED) |	\
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				  (1UL << BTRFS_ORDERED_DIRECT) |	\
				  (1UL << BTRFS_ORDERED_ENCODED))
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struct btrfs_ordered_extent {
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	/* logical offset in the file */
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	u64 file_offset;
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	/*
	 * These fields directly correspond to the same fields in
	 * btrfs_file_extent_item.
	 */
	u64 num_bytes;
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	u64 ram_bytes;
	u64 disk_bytenr;
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	u64 disk_num_bytes;
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	u64 offset;
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	/* number of bytes that still need writing */
	u64 bytes_left;

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	/*
	 * 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;

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	/*
	 * 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;

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	/* flags (described above) */
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	unsigned long flags;
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	/* compression algorithm */
	int compress_type;

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	/* Qgroup reserved space */
	int qgroup_rsv;

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	/* reference count */
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	refcount_t refs;
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	/* the inode we belong to */
	struct inode *inode;

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

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	/* used to wait for the BTRFS_ORDERED_COMPLETE bit */
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	wait_queue_head_t wait;
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	/* our friendly rbtree entry */
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	struct rb_node rb_node;
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	/* a per root list of all the pending ordered extents */
	struct list_head root_extent_list;
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	struct btrfs_work work;
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	struct completion completion;
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	struct btrfs_work flush_work;
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	struct list_head work_list;
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	/*
	 * Used to reverse-map physical address returned from ZONE_APPEND write
	 * command in a workqueue context
	 */
	u64 physical;
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	struct block_device *bdev;
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};
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static inline void
btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
{
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	spin_lock_init(&t->lock);
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	t->tree = RB_ROOT;
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	t->last = NULL;
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}

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int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent);

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void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
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void btrfs_remove_ordered_extent(struct btrfs_inode *btrfs_inode,
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				struct btrfs_ordered_extent *entry);
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void btrfs_mark_ordered_io_finished(struct btrfs_inode *inode,
				struct page *page, u64 file_offset,
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				u64 num_bytes, bool uptodate);
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bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode,
				    struct btrfs_ordered_extent **cached,
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				    u64 file_offset, u64 io_size);
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int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
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			     u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
			     u64 disk_num_bytes, u64 offset, unsigned flags,
			     int compress_type);
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void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry,
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			   struct btrfs_ordered_sum *sum);
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struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode,
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							 u64 file_offset);
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void btrfs_start_ordered_extent(struct btrfs_ordered_extent *entry);
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int btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
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struct btrfs_ordered_extent *
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btrfs_lookup_first_ordered_extent(struct btrfs_inode *inode, u64 file_offset);
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struct btrfs_ordered_extent *btrfs_lookup_first_ordered_range(
			struct btrfs_inode *inode, u64 file_offset, u64 len);
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struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
		struct btrfs_inode *inode,
		u64 file_offset,
		u64 len);
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void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode,
					   struct list_head *list);
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u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
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			       const u64 range_start, const u64 range_len);
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void btrfs_wait_ordered_roots(struct btrfs_fs_info *fs_info, u64 nr,
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			      const u64 range_start, const u64 range_len);
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void btrfs_lock_and_flush_ordered_range(struct btrfs_inode *inode, u64 start,
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					u64 end,
					struct extent_state **cached_state);
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bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end,
				  struct extent_state **cached_state);
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int btrfs_split_ordered_extent(struct btrfs_ordered_extent *ordered, u64 pre,
			       u64 post);
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int __init ordered_data_init(void);
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void __cold ordered_data_exit(void);
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#endif