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FreeBSD: Fix ZFS so that snapshots under .zfs/snapshot are NFS visible 

Call vfs_exjail_clone() for mounts created under .zfs/snapshot
to fill in the mnt_exjail field for the mount.  If this is not
done, the snapshots under .zfs/snapshot with not be accessible
over NFS.

This version has the argument name in vfs.h fixed to match that
of the name in spl_vfs.c, although it really does not matter.

External-issue: https://reviews.freebsd.org/D42672
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rick Macklem <rmacklem@uoguelph.ca>
Closes #15563
This commit is contained in:
rmacklem 2023-11-27 16:31:03 -08:00 committed by Tony Hutter
parent a8c256046b
commit 522414da3b
3 changed files with 11 additions and 3 deletions
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2
include/os/freebsd/spl/sys/vfs.h
View File

@ -101,7 +101,7 @@ void vfs_setmntopt(vfs_t *vfsp, const char *name, const char *arg,
void vfs_clearmntopt(vfs_t *vfsp, const char *name);
int vfs_optionisset(const vfs_t *vfsp, const char *opt, char **argp);
int mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype,
char *fspath, char *fspec, int fsflags);
char *fspath, char *fspec, int fsflags, vfs_t *parent_vfsp);
typedef uint64_t vfs_feature_t;

9
module/os/freebsd/spl/spl_vfs.c
View File

@ -120,7 +120,7 @@ vfs_optionisset(const vfs_t *vfsp, const char *opt, char **argp)
int
mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
char *fspec, int fsflags)
char *fspec, int fsflags, vfs_t *parent_vfsp)
{
struct vfsconf *vfsp;
struct mount *mp;
@ -220,6 +220,13 @@ mount_snapshot(kthread_t *td, vnode_t **vpp, const char *fstype, char *fspath,
mp->mnt_opt = mp->mnt_optnew;
(void) VFS_STATFS(mp, &mp->mnt_stat);
#ifdef VFS_SUPPORTS_EXJAIL_CLONE
/*
* Clone the mnt_exjail credentials of the parent, as required.
*/
vfs_exjail_clone(parent_vfsp, mp);
#endif
/*
* Prevent external consumers of mount options from reading
* mnt_optnew.

3
module/os/freebsd/zfs/zfs_ctldir.c
View File

@ -1026,7 +1026,8 @@ zfsctl_snapdir_lookup(struct vop_lookup_args *ap)
"%s/" ZFS_CTLDIR_NAME "/snapshot/%s",
dvp->v_vfsp->mnt_stat.f_mntonname, name);
err = mount_snapshot(curthread, vpp, "zfs", mountpoint, fullname, 0);
err = mount_snapshot(curthread, vpp, "zfs", mountpoint, fullname, 0,
dvp->v_vfsp);
kmem_free(mountpoint, mountpoint_len);
if (err == 0) {
/*