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btrfs: use READ_ONCE() to read the chunk size from the data space_info

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The chunk size of a space_info is always updated with WRITE_ONCE() (see
btrfs_update_space_info_chunk_size()), so when reading it in
calc_effective_data_chunk_size() we should use READ_ONCE() to prevent
load tearing. We are already using READ_ONCE() in every other function
that accesses the chunk size of a space_info.

Reviewed-by: Daniel Vacek <neelx@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2026-10-05 13:19:41 +01:00 committed by David Sterba
parent c97b139c6c
commit bbb86c6dc1
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/space-info.c
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@ -443,8 +443,8 @@ static u64 calc_effective_data_chunk_size(const struct btrfs_fs_info *fs_info)
*/
data_sinfo = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA);
if (btrfs_is_zoned(fs_info))
return data_sinfo->chunk_size;
data_chunk_size = min(data_sinfo->chunk_size,
return READ_ONCE(data_sinfo->chunk_size);
data_chunk_size = min(READ_ONCE(data_sinfo->chunk_size),
mult_perc(fs_info->fs_devices->total_rw_bytes, 10));
return min_t(u64, data_chunk_size, SZ_1G);
}