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Fix page fault in zfsctl_snapdir_getattr 

Must acquire the z_teardown_lock before accessing the zfsvfs_t object.
I can't reproduce this panic on demand, but this looks like the
correct solution.

Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Authored-by: asomers <asomers@FreeBSD.org>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #10656
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Matthew Macy 2020-08-01 08:42:55 -07:00 committed by GitHub
parent 8fb79fdddb
commit fe628bc21d
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1 changed files with 2 additions and 1 deletions
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3
module/os/freebsd/zfs/zfs_ctldir.c
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@ -1088,11 +1088,12 @@ zfsctl_snapdir_getattr(struct vop_getattr_args *ap)
vnode_t *vp = ap->a_vp;
vattr_t *vap = ap->a_vap;
zfsvfs_t *zfsvfs = vp->v_vfsp->vfs_data;
dsl_dataset_t *ds = dmu_objset_ds(zfsvfs->z_os);
dsl_dataset_t *ds;
uint64_t snap_count;
int err;
ZFS_ENTER(zfsvfs);
ds = dmu_objset_ds(zfsvfs->z_os);
zfsctl_common_getattr(vp, vap);
vap->va_ctime = dmu_objset_snap_cmtime(zfsvfs->z_os);
vap->va_mtime = vap->va_ctime;