static void
zfsctl_rename_snap(zfsctl_snapdir_t *sdp, zfs_snapentry_t *sep, const char *nm)
{
avl_index_t where;
vfs_t *vfsp;
refstr_t *pathref;
char newpath[MAXNAMELEN];
char *tail;
ASSERT(MUTEX_HELD(&sdp->sd_lock));
ASSERT(sep != NULL);
vfsp = vn_mountedvfs(sep->se_root);
ASSERT(vfsp != NULL);
vfs_lock_wait(vfsp);
/*
* Change the name in the AVL tree.
*/
avl_remove(&sdp->sd_snaps, sep);
kmem_free(sep->se_name, strlen(sep->se_name) + 1);
sep->se_name = kmem_alloc(strlen(nm) + 1, KM_SLEEP);
(void) strcpy(sep->se_name, nm);
VERIFY(avl_find(&sdp->sd_snaps, sep, &where) == NULL);
avl_insert(&sdp->sd_snaps, sep, where);
/*
* Change the current mountpoint info:
* - update the tail of the mntpoint path
* - update the tail of the resource path
*/
pathref = vfs_getmntpoint(vfsp);
(void) strncpy(newpath, refstr_value(pathref), sizeof (newpath));
VERIFY((tail = strrchr(newpath, '/')) != NULL);
*(tail+1) = '\0';
ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath));
(void) strcat(newpath, nm);
refstr_rele(pathref);
vfs_setmntpoint(vfsp, newpath);
pathref = vfs_getresource(vfsp);
(void) strncpy(newpath, refstr_value(pathref), sizeof (newpath));
VERIFY((tail = strrchr(newpath, '@')) != NULL);
*(tail+1) = '\0';
ASSERT3U(strlen(newpath) + strlen(nm), <, sizeof (newpath));
(void) strcat(newpath, nm);
refstr_rele(pathref);
vfs_setresource(vfsp, newpath);
vfs_unlock(vfsp);
}
/*ARGSUSED*/
static int
fdmount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr)
{
struct vnode *vp;
if (secpolicy_fs_mount(cr, mvp, vfsp) != 0)
return (EPERM);
if (mvp->v_type != VDIR)
return (ENOTDIR);
mutex_enter(&mvp->v_lock);
if ((uap->flags & MS_OVERLAY) == 0 &&
(mvp->v_count > 1 || (mvp->v_flag & VROOT))) {
mutex_exit(&mvp->v_lock);
return (EBUSY);
}
mutex_exit(&mvp->v_lock);
/*
* Having the resource be anything but "fd" doesn't make sense
*/
vfs_setresource(vfsp, "fd");
vp = vn_alloc(KM_SLEEP);
vp->v_vfsp = vfsp;
vn_setops(vp, fd_vnodeops);
vp->v_type = VDIR;
vp->v_data = NULL;
vp->v_flag |= VROOT;
vfsp->vfs_fstype = fdfstype;
vfsp->vfs_data = (char *)vp;
mutex_enter(&fd_minor_lock);
do {
fdfsmin = (fdfsmin + 1) & L_MAXMIN32;
vfsp->vfs_dev = makedevice(fdfsmaj, fdfsmin);
} while (vfs_devismounted(vfsp->vfs_dev));
mutex_exit(&fd_minor_lock);
vfs_make_fsid(&vfsp->vfs_fsid, vfsp->vfs_dev, fdfstype);
vfsp->vfs_bsize = 1024;
return (0);
}
/*
* Mount a file descriptor onto the node in the file system.
* Create a new vnode, update the attributes with info from the
* file descriptor and the mount point. The mask, mode, uid, gid,
* atime, mtime and ctime are taken from the mountpt. Link count is
* set to one, the file system id is namedev and nodeid is unique
* for each mounted object. Other attributes are taken from mount point.
* Make sure user is owner (or root) with write permissions on mount point.
* Hash the new vnode and return 0.
* Upon entry to this routine, the file descriptor is in the
* fd field of a struct namefd. Copy that structure from user
* space and retrieve the file descriptor.
*/
static int
nm_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *crp)
{
struct namefd namefdp;
struct vnode *filevp; /* file descriptor vnode */
struct file *fp;
struct vnode *newvp; /* vnode representing this mount */
struct vnode *rvp; /* realvp (if any) for the mountpt */
struct namenode *nodep; /* namenode for this mount */
struct vattr filevattr; /* attributes of file dec. */
struct vattr *vattrp; /* attributes of this mount */
char *resource_name;
char *resource_nodetype;
statvfs64_t *svfsp;
int error = 0;
/*
* Get the file descriptor from user space.
* Make sure the file descriptor is valid and has an
* associated file pointer.
* If so, extract the vnode from the file pointer.
*/
if (uap->datalen != sizeof (struct namefd))
return (EINVAL);
if (copyin(uap->dataptr, &namefdp, uap->datalen))
return (EFAULT);
if ((fp = getf(namefdp.fd)) == NULL)
return (EBADF);
/*
* If the mount point already has something mounted
* on it, disallow this mount. (This restriction may
* be removed in a later release).
* Or unmount has completed but the namefs ROOT vnode
* count has not decremented to zero, disallow this mount.
*/
mutex_enter(&mvp->v_lock);
if ((mvp->v_flag & VROOT) ||
vfs_matchops(mvp->v_vfsp, namefs_vfsops)) {
mutex_exit(&mvp->v_lock);
releasef(namefdp.fd);
return (EBUSY);
}
mutex_exit(&mvp->v_lock);
/*
* Cannot allow users to fattach() in /dev/pts.
* First, there is no need for doing so and secondly
* we cannot allow arbitrary users to park on a node in
* /dev/pts or /dev/vt.
*/
rvp = NULLVP;
if (vn_matchops(mvp, spec_getvnodeops()) &&
VOP_REALVP(mvp, &rvp, NULL) == 0 && rvp &&
(vn_matchops(rvp, devpts_getvnodeops()) ||
vn_matchops(rvp, devvt_getvnodeops()))) {
releasef(namefdp.fd);
return (ENOTSUP);
}
filevp = fp->f_vnode;
if (filevp->v_type == VDIR || filevp->v_type == VPORT) {
releasef(namefdp.fd);
return (EINVAL);
}
/*
* If the fd being mounted refers to neither a door nor a stream,
* make sure the caller is privileged.
*/
if (filevp->v_type != VDOOR && filevp->v_stream == NULL) {
if (secpolicy_fs_mount(crp, filevp, vfsp) != 0) {
/* fd is neither a stream nor a door */
releasef(namefdp.fd);
return (EINVAL);
}
}
/*
* Make sure the file descriptor is not the root of some
* file system.
* If it's not, create a reference and allocate a namenode
* to represent this mount request.
*/
if (filevp->v_flag & VROOT) {
releasef(namefdp.fd);
return (EBUSY);
}
nodep = kmem_zalloc(sizeof (struct namenode), KM_SLEEP);
mutex_init(&nodep->nm_lock, NULL, MUTEX_DEFAULT, NULL);
vattrp = &nodep->nm_vattr;
vattrp->va_mask = AT_ALL;
if (error = VOP_GETATTR(mvp, vattrp, 0, crp, NULL))
goto out;
filevattr.va_mask = AT_ALL;
if (error = VOP_GETATTR(filevp, &filevattr, 0, crp, NULL))
goto out;
/*
* Make sure the user is the owner of the mount point
* or has sufficient privileges.
*/
if (error = secpolicy_vnode_owner(crp, vattrp->va_uid))
goto out;
/*
* Make sure the user has write permissions on the
* mount point (or has sufficient privileges).
*/
if (!(vattrp->va_mode & VWRITE) &&
secpolicy_vnode_access(crp, mvp, vattrp->va_uid, VWRITE) != 0) {
error = EACCES;
goto out;
}
/*
* If the file descriptor has file/record locking, don't
* allow the mount to succeed.
*/
if (vn_has_flocks(filevp)) {
error = EACCES;
goto out;
}
/*
* Initialize the namenode.
*/
if (filevp->v_stream) {
struct stdata *stp = filevp->v_stream;
mutex_enter(&stp->sd_lock);
stp->sd_flag |= STRMOUNT;
mutex_exit(&stp->sd_lock);
}
nodep->nm_filevp = filevp;
mutex_enter(&fp->f_tlock);
fp->f_count++;
mutex_exit(&fp->f_tlock);
releasef(namefdp.fd);
nodep->nm_filep = fp;
nodep->nm_mountpt = mvp;
/*
* The attributes for the mounted file descriptor were initialized
* above by applying VOP_GETATTR to the mount point. Some of
* the fields of the attributes structure will be overwritten
* by the attributes from the file descriptor.
*/
vattrp->va_type = filevattr.va_type;
vattrp->va_fsid = namedev;
vattrp->va_nodeid = namenodeno_alloc();
vattrp->va_nlink = 1;
vattrp->va_size = filevattr.va_size;
vattrp->va_rdev = filevattr.va_rdev;
vattrp->va_blksize = filevattr.va_blksize;
vattrp->va_nblocks = filevattr.va_nblocks;
vattrp->va_seq = 0;
/*
* Initialize new vnode structure for the mounted file descriptor.
*/
nodep->nm_vnode = vn_alloc(KM_SLEEP);
newvp = NMTOV(nodep);
newvp->v_flag = filevp->v_flag | VROOT | VNOMAP | VNOSWAP;
vn_setops(newvp, nm_vnodeops);
newvp->v_vfsp = vfsp;
newvp->v_stream = filevp->v_stream;
newvp->v_type = filevp->v_type;
newvp->v_rdev = filevp->v_rdev;
newvp->v_data = (caddr_t)nodep;
VFS_HOLD(vfsp);
vn_exists(newvp);
/*
* Initialize the vfs structure.
*/
vfsp->vfs_vnodecovered = NULL;
vfsp->vfs_flag |= VFS_UNLINKABLE;
vfsp->vfs_bsize = 1024;
vfsp->vfs_fstype = namefstype;
vfs_make_fsid(&vfsp->vfs_fsid, namedev, namefstype);
vfsp->vfs_data = (caddr_t)nodep;
vfsp->vfs_dev = namedev;
vfsp->vfs_bcount = 0;
/*
* Set the name we mounted from.
*/
switch (filevp->v_type) {
case VPROC: /* VOP_GETATTR() translates this to VREG */
case VREG: resource_nodetype = "file"; break;
case VDIR: resource_nodetype = "directory"; break;
case VBLK: resource_nodetype = "device"; break;
case VCHR: resource_nodetype = "device"; break;
case VLNK: resource_nodetype = "link"; break;
case VFIFO: resource_nodetype = "fifo"; break;
case VDOOR: resource_nodetype = "door"; break;
case VSOCK: resource_nodetype = "socket"; break;
default: resource_nodetype = "resource"; break;
}
#define RESOURCE_NAME_SZ 128 /* Maximum length of the resource name */
resource_name = kmem_alloc(RESOURCE_NAME_SZ, KM_SLEEP);
svfsp = kmem_alloc(sizeof (statvfs64_t), KM_SLEEP);
error = VFS_STATVFS(filevp->v_vfsp, svfsp);
if (error == 0) {
(void) snprintf(resource_name, RESOURCE_NAME_SZ,
"unspecified_%s_%s", svfsp->f_basetype, resource_nodetype);
} else {
(void) snprintf(resource_name, RESOURCE_NAME_SZ,
"unspecified_%s", resource_nodetype);
}
vfs_setresource(vfsp, resource_name);
kmem_free(svfsp, sizeof (statvfs64_t));
kmem_free(resource_name, RESOURCE_NAME_SZ);
#undef RESOURCE_NAME_SZ
/*
* Insert the namenode.
*/
mutex_enter(&ntable_lock);
nameinsert(nodep);
mutex_exit(&ntable_lock);
return (0);
out:
releasef(namefdp.fd);
kmem_free(nodep, sizeof (struct namenode));
return (error);
}
