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vfs: do an unlocked check before iterating the lazy list

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For most filesystems it is expected to be empty most of the time.
This commit is contained in:
Mateusz Guzik 2020-01-26 07:06:18 +00:00
parent cd0e46c66b
commit 1513f80391
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357136
1 changed files with 3 additions and 0 deletions
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3
sys/kern/vfs_subr.c
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@ -6368,6 +6368,9 @@ __mnt_vnode_first_lazy(struct vnode **mvp, struct mount *mp, mnt_lazy_cb_t *cb,
{
struct vnode *vp;
if (TAILQ_EMPTY(&mp->mnt_lazyvnodelist))
return (NULL);
*mvp = vn_alloc_marker(mp);
MNT_ILOCK(mp);
MNT_REF(mp);