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>

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Mateusz Guzik 2025-10-06 01:15:26 +02:00 • committed by Christian Brauner

parent 0f607a89af

commit 31e332b911

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4

fs/dcache.c

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8

fs/inode.c

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4

include/linux/writeback.h

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