diff options
Diffstat (limited to 'sys/fs')
| -rw-r--r-- | sys/fs/nullfs/null_vnops.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c index 3434deb..fd421e4 100644 --- a/sys/fs/nullfs/null_vnops.c +++ b/sys/fs/nullfs/null_vnops.c @@ -472,6 +472,32 @@ null_access(struct vop_access_args *ap) return (null_bypass((struct vop_generic_args *)ap)); } +static int +null_accessx(struct vop_accessx_args *ap) +{ + struct vnode *vp = ap->a_vp; + accmode_t accmode = ap->a_accmode; + + /* + * Disallow write attempts on read-only layers; + * unless the file is a socket, fifo, or a block or + * character device resident on the filesystem. + */ + if (accmode & VWRITE) { + switch (vp->v_type) { + case VDIR: + case VLNK: + case VREG: + if (vp->v_mount->mnt_flag & MNT_RDONLY) + return (EROFS); + break; + default: + break; + } + } + return (null_bypass((struct vop_generic_args *)ap)); +} + /* * We handle this to eliminate null FS to lower FS * file moving. Don't know why we don't allow this, @@ -720,6 +746,7 @@ null_vptofh(struct vop_vptofh_args *ap) struct vop_vector null_vnodeops = { .vop_bypass = null_bypass, .vop_access = null_access, + .vop_accessx = null_accessx, .vop_bmap = VOP_EOPNOTSUPP, .vop_getattr = null_getattr, .vop_getwritemount = null_getwritemount, |
