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btrfs: extract the max compression chunk size into a macro

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We have two locations using open-coded 512K size, as the async chunk
size.

For compression we have not only the max size a compressed extent can
represent (128K), but also how large an async chunk can be (512K).

Although we have a macro for the maximum compressed extent size, we do
not have any macro for the async chunk size.

Add such a macro and replace the two open-coded SZ_512K.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2026-02-27 13:15:53 +10:30 committed by David Sterba
parent 45cc960ff7
commit cab4c8b594
2 changed files with 5 additions and 2 deletions
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3
fs/btrfs/compression.h
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@ -36,6 +36,9 @@ struct btrfs_ordered_extent;
#define BTRFS_MAX_COMPRESSED_PAGES (BTRFS_MAX_COMPRESSED / PAGE_SIZE)
static_assert((BTRFS_MAX_COMPRESSED % PAGE_SIZE) == 0);
/* The max size for a single worker to compress. */
#define BTRFS_COMPRESSION_CHUNK_SIZE (SZ_512K)
/* Maximum size of data before compression */
#define BTRFS_MAX_UNCOMPRESSED (SZ_128K)

4
fs/btrfs/inode.c
View File

@ -1691,7 +1691,7 @@ static bool run_delalloc_compressed(struct btrfs_inode *inode,
struct async_cow *ctx;
struct async_chunk *async_chunk;
unsigned long nr_pages;
u64 num_chunks = DIV_ROUND_UP(end - start, SZ_512K);
u64 num_chunks = DIV_ROUND_UP(end - start, BTRFS_COMPRESSION_CHUNK_SIZE);
int i;
unsigned nofs_flag;
const blk_opf_t write_flags = wbc_to_write_flags(wbc);
@ -1708,7 +1708,7 @@ static bool run_delalloc_compressed(struct btrfs_inode *inode,
atomic_set(&ctx->num_chunks, num_chunks);
for (i = 0; i < num_chunks; i++) {
u64 cur_end = min(end, start + SZ_512K - 1);
u64 cur_end = min(end, start + BTRFS_COMPRESSION_CHUNK_SIZE - 1);
/*
* igrab is called higher up in the call chain, take only the