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vfs_hash_rehash(): require the vnode to be exclusively locked

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Rehash updates v_hash.  Also, rehash moves the vnode to different hash
bucket, which should be noticed in vfs_hash_get() after sleeping for
the vnode lock.

Reviewed by:	mckusick, rmacklem
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D31464
This commit is contained in:
Konstantin Belousov 2021-08-18 14:14:42 +03:00
parent 7c1e4aab79
commit f19063ab02
1 changed files with 1 additions and 0 deletions
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sys/kern/vfs_hash.c
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@ -196,6 +196,7 @@ vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td,
void
vfs_hash_rehash(struct vnode *vp, u_int hash)
{
ASSERT_VOP_ELOCKED(vp, "rehash requires excl lock");
rw_wlock(&vfs_hash_lock);
LIST_REMOVE(vp, v_hashlist);