diff options
| author | Jinjie Ruan <ruanjinjie@huawei.com> | 2026-09-02 15:48:05 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2026-10-08 11:07:33 -0400 |
| commit | 4a87cfb9b45ae07cd28bdc1ab9059ea73eab312e (patch) | |
| tree | 14aa0b40d8e328632ac756fd6fd47e726a9a381b /include/linux | |
| parent | b067d3c1f90b536e9aa9f48b19580475a0b34f0f (diff) | |
ext4: convert group-count barrier protocol to acquire/release
During an online resize, reading s_groups_count and s_blockfile_groups
requires strict ordering against subsequent initialized block group
metadata.
Replace the historical smp_wmb()/smp_rmb() pairs with smp_store_release()
and smp_load_acquire(). This formalizes the publish-subscribe pattern
and allows weakly-ordered architectures (e.g., arm64) to utilize native
STLR/LDAR instructions instead of full DMB fences.
Update the documentation in resize.c and ext4.h accordingly.
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Baokun Li <libaokun@linux.alibaba.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Zhang Yi <yi.zhang@huawei.com>
Assisted-by: Gemini:Gemini-3.1
Assisted-by: DeepSeek:DeepSeek-V3
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://patch.msgid.link/20260902074805.398540-9-ruanjinjie@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions