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The current code to store the final logical to physical mapping for a zone append write in the extent tree is rather inefficient. It first has to split the ordered extent so that there is one ordered extent per bio, so that it can look up the ordered extent on I/O completion in btrfs_record_physical_zoned and store the physical LBA returned by the block driver in the ordered extent. btrfs_rewrite_logical_zoned then has to do a lookup in the chunk tree to see what physical address the logical address for this bio / ordered extent is mapped to, and then rewrite it in the extent tree. To optimize this process, we can store the physical address assigned in the chunk tree to the original logical address and a pointer to btrfs_ordered_sum structure the in the btrfs_bio structure, and then use this information to rewrite the logical address in the btrfs_ordered_sum structure directly at I/O completion time in btrfs_record_physical_zoned. btrfs_rewrite_logical_zoned then simply updates the logical address in the extent tree and the ordered_extent itself. The code in btrfs_rewrite_logical_zoned now runs for all data I/O completions in zoned file systems, which is fine as there is no remapping to do for non-append writes to conventional zones or for relocation, and the overhead for quickly breaking out of the loop is very low. Because zoned file systems now need the ordered_sums structure to record the actual write location returned by zone append, allocate dummy structures without the csum array for them when the I/O doesn't use checksums, and free them when completing the ordered_extent. Note that the btrfs_bio doesn't grow as the new field are places into a union that is so far not used for data writes and has plenty of space left in it. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
74 lines
2.7 KiB
C
74 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_FILE_ITEM_H
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#define BTRFS_FILE_ITEM_H
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#include "accessors.h"
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#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
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(offsetof(struct btrfs_file_extent_item, disk_bytenr))
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static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
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{
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return BTRFS_MAX_ITEM_SIZE(info) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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/*
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* Return the number of bytes used by the item on disk, minus the size of any
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* extent headers. If a file is compressed on disk, this is the compressed
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* size.
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*/
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static inline u32 btrfs_file_extent_inline_item_len(
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const struct extent_buffer *eb,
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int nr)
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{
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return btrfs_item_size(eb, nr) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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static inline unsigned long btrfs_file_extent_inline_start(
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const struct btrfs_file_extent_item *e)
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{
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return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
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}
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static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
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{
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return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
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}
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int btrfs_del_csums(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 bytenr, u64 len);
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blk_status_t btrfs_lookup_bio_sums(struct btrfs_bio *bbio);
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int btrfs_insert_hole_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid, u64 pos,
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u64 num_bytes);
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int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid,
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u64 bytenr, int mod);
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int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_ordered_sum *sums);
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blk_status_t btrfs_csum_one_bio(struct btrfs_bio *bbio);
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blk_status_t btrfs_alloc_dummy_sum(struct btrfs_bio *bbio);
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int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
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struct list_head *list, int search_commit,
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bool nowait);
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int btrfs_lookup_csums_list(struct btrfs_root *root, u64 start, u64 end,
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struct list_head *list, int search_commit,
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bool nowait);
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int btrfs_lookup_csums_bitmap(struct btrfs_root *root, u64 start, u64 end,
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u8 *csum_buf, unsigned long *csum_bitmap,
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bool search_commit);
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void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
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const struct btrfs_path *path,
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struct btrfs_file_extent_item *fi,
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struct extent_map *em);
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int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start,
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u64 len);
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int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start, u64 len);
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void btrfs_inode_safe_disk_i_size_write(struct btrfs_inode *inode, u64 new_i_size);
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u64 btrfs_file_extent_end(const struct btrfs_path *path);
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#endif
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