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fs: add missing fences to I_NEW handling

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Suppose there are 2 CPUs racing inode hash lookup func (say ilookup5())
and unlock_new_inode().

In principle the latter can clear the I_NEW flag before prior stores
into the inode were made visible.

The former can in turn observe I_NEW is cleared and proceed to use the
inode, while possibly reading from not-yet-published areas.

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Mateusz Guzik
2025-10-06 01:15:26 +02:00
committed by Christian Brauner
parent 0f607a89af
commit 31e332b911
3 changed files with 16 additions and 0 deletions
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4
include/linux/writeback.h
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@@ -194,6 +194,10 @@ static inline void wait_on_inode(struct inode *inode)
{
wait_var_event(inode_state_wait_address(inode, __I_NEW),
!(READ_ONCE(inode->i_state) & I_NEW));
/*
* Pairs with routines clearing I_NEW.
*/
smp_rmb();
}
#ifdef CONFIG_CGROUP_WRITEBACK