__dentry_kill(): get consistent rules for victim's refcount

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Currently we call it with refcount equal to 1 when called from
dentry_kill(); all other callers have it equal to 0.

Make it always be called with zero refcount; on this step we
just decrement it before the calls in dentry_kill().  That is
safe, since all places that care about the value of refcount
either do that under ->d_lock or hold a reference to dentry
in question.  Either is sufficient to prevent observing a
dentry immediately prior to __dentry_kill() getting called
from dentry_kill().

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Al Viro 2023-10-29 18:38:27 -04:00

parent e9d130d050

commit ee0c82503d

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fs/dcache.c

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