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to_shrink_list(): call only if refcount is 0 

JIRA: https://issues.redhat.com/browse/RHEL-29564

commit c2e5e29f3fdaff6f57795be068ce525c60954fd0
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Mon Oct 30 01:06:06 2023 -0400

    to_shrink_list(): call only if refcount is 0

    The only thing it does if refcount is not zero is d_lru_del(); no
    point, IMO, seeing that plain dput() does nothing of that sort...

    Note that 2 of 3 current callers are guaranteed that refcount is 0.

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

Signed-off-by: Ming Lei <ming.lei@redhat.com>
This commit is contained in:
Ming Lei 2023-10-30 01:06:06 -04:00
parent 1a7fe253af
commit 87ebce96ed
1 changed files with 2 additions and 5 deletions
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7
fs/dcache.c
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@ -915,8 +915,7 @@ __must_hold(&dentry->d_lock)
if (!(dentry->d_flags & DCACHE_SHRINK_LIST)) {
if (dentry->d_flags & DCACHE_LRU_LIST)
d_lru_del(dentry);
if (!dentry->d_lockref.count)
d_shrink_add(dentry, list);
d_shrink_add(dentry, list);
}
}
@ -1110,10 +1109,8 @@ EXPORT_SYMBOL(d_prune_aliases);
static inline void shrink_kill(struct dentry *victim, struct list_head *list)
{
struct dentry *parent = victim->d_parent;
if (parent != victim) {
--parent->d_lockref.count;
if (parent != victim && !--parent->d_lockref.count)
to_shrink_list(parent, list);
}
__dentry_kill(victim);
}