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FreeBSD: vfsops: use setgen for error case 

Fix from https://github.com/openzfs/zfs/pull/12844#discussion_r774179413

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12905
This commit is contained in:
наб 2022-01-06 20:15:08 +01:00 committed by Tony Hutter
parent 1259dc6e6a
commit 36a91d6cef
1 changed files with 7 additions and 1 deletions
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8
module/os/freebsd/zfs/zfs_vfsops.c
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@ -1801,6 +1801,7 @@ zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
vnode_t *dvp;
uint64_t object = 0;
uint64_t fid_gen = 0;
uint64_t setgen = 0;
uint64_t gen_mask;
uint64_t zp_gen;
int i, err;
@ -1816,7 +1817,6 @@ zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
zfid_long_t *zlfid = (zfid_long_t *)fidp;
uint64_t objsetid = 0;
uint64_t setgen = 0;
for (i = 0; i < sizeof (zlfid->zf_setid); i++)
objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
@ -1845,6 +1845,12 @@ zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, int flags, vnode_t **vpp)
return (SET_ERROR(EINVAL));
}
if (fidp->fid_len == LONG_FID_LEN && (fid_gen > 1 || setgen != 0)) {
dprintf("snapdir fid: fid_gen (%llu) and setgen (%llu)\n",
(u_longlong_t)fid_gen, (u_longlong_t)setgen);
return (SET_ERROR(EINVAL));
}
/*
* A zero fid_gen means we are in .zfs or the .zfs/snapshot
* directory tree. If the object == zfsvfs->z_shares_dir, then