216 lines
6.3 KiB
C
216 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#ifndef BTRFS_ORDERED_DATA_H
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#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 */
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u64 bytenr;
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/*
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* this is the length in bytes covered by the sums array below.
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*/
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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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*
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* BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
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* It is used to make sure metadata is inserted into the tree only once
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* per extent.
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*
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* BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
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* rbtree, just before waking any waiters. It is used to indicate the
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* IO is done and any metadata is inserted into the tree.
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*/
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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
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* need to be set when creating ordered extent.
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*
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* REGULAR: For regular non-compressed COW write
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* NOCOW: For NOCOW write into existing non-hole extent
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* PREALLOC: For NOCOW write into preallocated extent
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* COMPRESSED: For compressed COW write
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*/
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BTRFS_ORDERED_REGULAR,
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BTRFS_ORDERED_NOCOW,
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BTRFS_ORDERED_PREALLOC,
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BTRFS_ORDERED_COMPRESSED,
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/*
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* Extra bit for direct io, can only be set for
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* REGULAR/NOCOW/PREALLOC. No direct io for compressed extent.
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*/
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BTRFS_ORDERED_DIRECT,
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/* Extra status bits for ordered extents */
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/* set when all the pages are written */
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BTRFS_ORDERED_IO_DONE,
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/* set when removed from the tree */
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BTRFS_ORDERED_COMPLETE,
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/* We had an io error when writing this out */
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BTRFS_ORDERED_IOERR,
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/* Set when we have to truncate an extent */
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BTRFS_ORDERED_TRUNCATED,
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/* Used during fsync to track already logged extents */
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BTRFS_ORDERED_LOGGED,
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/* We have already logged all the csums of the ordered extent */
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BTRFS_ORDERED_LOGGED_CSUM,
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/* We wait for this extent to complete in the current transaction */
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BTRFS_ORDERED_PENDING,
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/* BTRFS_IOC_ENCODED_WRITE */
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BTRFS_ORDERED_ENCODED,
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};
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/* BTRFS_ORDERED_* flags that specify the type of the extent. */
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#define BTRFS_ORDERED_TYPE_FLAGS ((1UL << BTRFS_ORDERED_REGULAR) | \
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(1UL << BTRFS_ORDERED_NOCOW) | \
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(1UL << BTRFS_ORDERED_PREALLOC) | \
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(1UL << BTRFS_ORDERED_COMPRESSED) | \
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(1UL << BTRFS_ORDERED_DIRECT) | \
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(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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/*
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* These fields directly correspond to the same fields in
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* btrfs_file_extent_item.
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*/
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u64 num_bytes;
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u64 ram_bytes;
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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 */
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u64 bytes_left;
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/*
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* the end of the ordered extent which is behind it but
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* didn't update disk_i_size. Please see the comment of
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* btrfs_ordered_update_i_size();
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*/
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u64 outstanding_isize;
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/*
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* If we get truncated we need to adjust the file extent we enter for
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* this ordered extent so that we do not expose stale data.
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*/
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u64 truncated_len;
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/* flags (described above) */
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unsigned long flags;
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/* compression algorithm */
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int compress_type;
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/* Qgroup reserved space */
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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 */
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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 */
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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 */
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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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/*
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* Used to reverse-map physical address returned from ZONE_APPEND write
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* command in a workqueue context
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*/
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u64 physical;
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struct block_device *bdev;
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};
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static inline void
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btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
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{
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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,
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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,
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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,
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u64 disk_num_bytes, u64 offset, unsigned flags,
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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, int wait);
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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(
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struct btrfs_inode *inode, u64 file_offset, u64 len);
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struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
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struct btrfs_inode *inode,
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u64 file_offset,
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u64 len);
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void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode,
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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,
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struct extent_state **cached_state);
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bool btrfs_try_lock_ordered_range(struct btrfs_inode *inode, u64 start, u64 end);
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int btrfs_split_ordered_extent(struct btrfs_ordered_extent *ordered, u64 pre,
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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
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