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/* 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,
/* 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,
};
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 for fast fsyncs */
struct list_head log_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);
const u32 csum_size = fs_info->csum_size;
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 btrfs_inode *btrfs_inode,
struct btrfs_ordered_extent *entry);
int btrfs_dec_test_ordered_pending(struct btrfs_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 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 btrfs_inode *inode, u64 file_offset);
struct btrfs_ordered_extent *btrfs_lookup_ordered_range(
struct btrfs_inode *inode,
u64 file_offset,
u64 len);
void btrfs_get_ordered_extents_for_logging(struct btrfs_inode *inode,
struct list_head *list);
int btrfs_find_ordered_sum(struct btrfs_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
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