btrfs: use READ/WRITE_ONCE for fs_devices->read_policy

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Since we can read/modify the value from the sysfs interface concurrently,
it would be better to protect it from compiler optimizations.

Currently, there is only one read policy BTRFS_READ_POLICY_PID available,
so no actual problem can happen now. This is a preparation for the future
expansion.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Naohiro Aota 2024-02-02 13:23:28 +09:00 • committed by David Sterba

parent e383e158ed

commit 4dc4a3be6c

2 changed files with 9 additions and 8 deletions

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7

fs/btrfs/sysfs.c

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10

fs/btrfs/volumes.c

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