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bcachefs: Add missing smp_rmb()

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The smp_rmb() guarantees that reads from reservations.counter
occur before accessing cur_entry_u64s. It's paired with the
atomic64_try_cmpxchg in journal_entry_open.

Signed-off-by: Alan Huang <mmpgouride@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Alan Huang
2025-03-18 15:50:00 +08:00
committed by Kent Overstreet
parent 4a4000b9a6
commit 5d361ae5af
1 changed files with 3 additions and 1 deletions
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4
fs/bcachefs/journal.h
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@@ -350,8 +350,10 @@ static inline int journal_res_get_fast(struct journal *j,
/*
* Check if there is still room in the current journal
* entry:
* entry, smp_rmb() guarantees that reads from reservations.counter
* occur before accessing cur_entry_u64s:
*/
smp_rmb();
if (new.cur_entry_offset + res->u64s > j->cur_entry_u64s)
return 0;