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btrfs: pass the new logical address to split_extent_map

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split_extent_map splits off the first chunk of an extent map into a new
one.  One of the two users is the zoned I/O completion code that wants to
rewrite the logical block start address right after this split.  Pass in
the logical address to be set in the split off first extent_map as an
argument to avoid an extra extent tree lookup for this case.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2023-05-24 17:03:17 +02:00 • committed by David Sterba
parent 71df088c1c
commit f000bc6fe4
4 changed files with 11 additions and 9 deletions
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8
fs/btrfs/extent_map.c
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@ -963,11 +963,13 @@ int btrfs_replace_extent_map_range(struct btrfs_inode *inode,
}
/*
* Split off the first pre bytes from the extent_map at [start, start + len]
* Split off the first pre bytes from the extent_map at [start, start + len],
* and set the block_start for it to new_logical.
*
* This function is used when an ordered_extent needs to be split.
*/
int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre)
int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre,
u64 new_logical)
{
struct extent_map_tree *em_tree = &inode->extent_tree;
struct extent_map *em;
@ -1010,7 +1012,7 @@ int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre)
split_pre->start = em->start;
split_pre->len = pre;
split_pre->orig_start = split_pre->start;
split_pre->block_start = em->block_start;
split_pre->block_start = new_logical;
split_pre->block_len = split_pre->len;
split_pre->orig_block_len = split_pre->block_len;
split_pre->ram_bytes = split_pre->len;