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vfs: assert the lock held in MNT_REF/MNT_REL

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Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mateusz Guzik 2019-08-23 21:05:37 +00:00
parent f93670b7b9
commit 25c8d940ab
1 changed files with 5 additions and 1 deletions
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6
sys/sys/mount.h
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@ -265,8 +265,12 @@ void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
#define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
#define MNT_MTX(mp) (&(mp)->mnt_mtx)
#define MNT_REF(mp) (mp)->mnt_ref++
#define MNT_REF(mp) do { \
mtx_assert(MNT_MTX(mp), MA_OWNED); \
(mp)->mnt_ref++; \
} while (0)
#define MNT_REL(mp) do { \
mtx_assert(MNT_MTX(mp), MA_OWNED); \
KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
(mp)->mnt_ref--; \
if ((mp)->mnt_ref == 0) \