Doing first mount and updating mount points are both handled by the same
syscall and the same function, but are very different and share almost no code. To make it easier to read and analyze, split vfs_domount() into vfs_domount_first() and vfs_domount_update(). Reviewed by: kib
This commit is contained in:
Pawel Jakub Dawidek
parent
a34512e3f0
commit
7443b79b81
@ -704,9 +704,7 @@ vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions)
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goto bail;
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}
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mtx_lock(&Giant);
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error = vfs_domount(td, fstype, fspath, fsflags, optlist);
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mtx_unlock(&Giant);
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bail:
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/* copyout the errmsg */
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if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
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@ -795,6 +793,257 @@ mount(td, uap)
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return (error);
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}
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/*
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* vfs_domount_first(): first file system mount (not update)
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*/
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static int
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vfs_domount_first(
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struct thread *td, /* Calling thread. */
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struct vfsconf *vfsp, /* File system type. */
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char *fspath, /* Mount path. */
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struct vnode *vp, /* Vnode to be covered. */
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int fsflags, /* Flags common to all filesystems. */
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void *fsdata /* Options local to the filesystem. */
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)
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{
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struct vattr va;
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struct mount *mp;
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struct vnode *newdp;
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int error;
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mtx_assert(&Giant, MA_OWNED);
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ASSERT_VOP_ELOCKED(vp, __func__);
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KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
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/*
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* If the user is not root, ensure that they own the directory
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* onto which we are attempting to mount.
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*/
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error = VOP_GETATTR(vp, &va, td->td_ucred);
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if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
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error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
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if (error == 0)
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error = vinvalbuf(vp, V_SAVE, 0, 0);
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if (error == 0 && vp->v_type != VDIR)
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error = ENOTDIR;
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if (error == 0) {
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VI_LOCK(vp);
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if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
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vp->v_iflag |= VI_MOUNT;
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else
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error = EBUSY;
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VI_UNLOCK(vp);
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}
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if (error != 0) {
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vput(vp);
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return (error);
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}
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VOP_UNLOCK(vp, 0);
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/* Allocate and initialize the filesystem. */
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mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
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/* XXXMAC: pass to vfs_mount_alloc? */
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mp->mnt_optnew = fsdata;
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/* Set the mount level flags. */
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mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
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/*
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* Mount the filesystem.
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* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
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* get. No freeing of cn_pnbuf.
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*/
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error = VFS_MOUNT(mp);
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if (error != 0) {
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vfs_unbusy(mp);
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vfs_mount_destroy(mp);
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vrele(vp);
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return (error);
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}
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if (mp->mnt_opt != NULL)
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vfs_freeopts(mp->mnt_opt);
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mp->mnt_opt = mp->mnt_optnew;
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(void)VFS_STATFS(mp, &mp->mnt_stat);
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/*
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* Prevent external consumers of mount options from reading mnt_optnew.
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*/
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mp->mnt_optnew = NULL;
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MNT_ILOCK(mp);
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if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
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mp->mnt_kern_flag |= MNTK_ASYNC;
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else
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mp->mnt_kern_flag &= ~MNTK_ASYNC;
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MNT_IUNLOCK(mp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
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cache_purge(vp);
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VI_LOCK(vp);
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vp->v_iflag &= ~VI_MOUNT;
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VI_UNLOCK(vp);
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vp->v_mountedhere = mp;
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/* Place the new filesystem at the end of the mount list. */
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mtx_lock(&mountlist_mtx);
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TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
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mtx_unlock(&mountlist_mtx);
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vfs_event_signal(NULL, VQ_MOUNT, 0);
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if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
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panic("mount: lost mount");
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VOP_UNLOCK(newdp, 0);
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VOP_UNLOCK(vp, 0);
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mountcheckdirs(vp, newdp);
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vrele(newdp);
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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vfs_allocate_syncvnode(mp);
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vfs_unbusy(mp);
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return (0);
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}
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/*
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* vfs_domount_update(): update of mounted file system
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*/
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static int
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vfs_domount_update(
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struct thread *td, /* Calling thread. */
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struct vnode *vp, /* Mount point vnode. */
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int fsflags, /* Flags common to all filesystems. */
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void *fsdata /* Options local to the filesystem. */
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)
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{
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struct oexport_args oexport;
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struct export_args export;
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struct mount *mp;
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int error, flag;
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mtx_assert(&Giant, MA_OWNED);
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ASSERT_VOP_ELOCKED(vp, __func__);
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KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
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if ((vp->v_vflag & VV_ROOT) == 0) {
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vput(vp);
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return (EINVAL);
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}
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mp = vp->v_mount;
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/*
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* We only allow the filesystem to be reloaded if it
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* is currently mounted read-only.
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*/
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flag = mp->mnt_flag;
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if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
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vput(vp);
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return (EOPNOTSUPP); /* Needs translation */
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}
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/*
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* Only privileged root, or (if MNT_USER is set) the user that
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* did the original mount is permitted to update it.
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*/
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error = vfs_suser(mp, td);
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if (error != 0) {
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vput(vp);
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return (error);
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}
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if (vfs_busy(mp, MBF_NOWAIT)) {
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vput(vp);
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return (EBUSY);
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}
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VI_LOCK(vp);
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if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
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VI_UNLOCK(vp);
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vfs_unbusy(mp);
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vput(vp);
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return (EBUSY);
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}
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vp->v_iflag |= VI_MOUNT;
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VI_UNLOCK(vp);
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VOP_UNLOCK(vp, 0);
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MNT_ILOCK(mp);
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mp->mnt_flag &= ~MNT_UPDATEMASK;
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mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
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MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
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if ((mp->mnt_flag & MNT_ASYNC) == 0)
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mp->mnt_kern_flag &= ~MNTK_ASYNC;
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MNT_IUNLOCK(mp);
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mp->mnt_optnew = fsdata;
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vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
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/*
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* Mount the filesystem.
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* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
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* get. No freeing of cn_pnbuf.
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*/
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error = VFS_MOUNT(mp);
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if (error == 0) {
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/* Process the export option. */
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if (vfs_copyopt(mp->mnt_optnew, "export", &export,
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sizeof(export)) == 0) {
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error = vfs_export(mp, &export);
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} else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
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sizeof(oexport)) == 0) {
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export.ex_flags = oexport.ex_flags;
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export.ex_root = oexport.ex_root;
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export.ex_anon = oexport.ex_anon;
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export.ex_addr = oexport.ex_addr;
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export.ex_addrlen = oexport.ex_addrlen;
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export.ex_mask = oexport.ex_mask;
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export.ex_masklen = oexport.ex_masklen;
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export.ex_indexfile = oexport.ex_indexfile;
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export.ex_numsecflavors = 0;
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error = vfs_export(mp, &export);
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}
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}
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MNT_ILOCK(mp);
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if (error == 0) {
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mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
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MNT_SNAPSHOT);
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} else {
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/*
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* If we fail, restore old mount flags. MNT_QUOTA is special,
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* because it is not part of MNT_UPDATEMASK, but it could have
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* changed in the meantime if quotactl(2) was called.
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* All in all we want current value of MNT_QUOTA, not the old
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* one.
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*/
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mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
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}
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if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
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mp->mnt_kern_flag |= MNTK_ASYNC;
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else
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mp->mnt_kern_flag &= ~MNTK_ASYNC;
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MNT_IUNLOCK(mp);
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if (error != 0)
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goto end;
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if (mp->mnt_opt != NULL)
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vfs_freeopts(mp->mnt_opt);
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mp->mnt_opt = mp->mnt_optnew;
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(void)VFS_STATFS(mp, &mp->mnt_stat);
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/*
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* Prevent external consumers of mount options from reading
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* mnt_optnew.
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*/
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mp->mnt_optnew = NULL;
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if ((mp->mnt_flag & MNT_RDONLY) == 0) {
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if (mp->mnt_syncer == NULL)
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vfs_allocate_syncvnode(mp);
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} else {
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if (mp->mnt_syncer != NULL)
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vrele(mp->mnt_syncer);
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mp->mnt_syncer = NULL;
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}
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end:
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vfs_unbusy(mp);
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VI_LOCK(vp);
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vp->v_iflag &= ~VI_MOUNT;
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VI_UNLOCK(vp);
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vrele(vp);
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return (error);
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}
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/*
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* vfs_domount(): actually attempt a filesystem mount.
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@ -808,16 +1057,11 @@ vfs_domount(
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void *fsdata /* Options local to the filesystem. */
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)
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{
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struct vnode *vp;
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struct mount *mp;
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struct vfsconf *vfsp;
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struct oexport_args oexport;
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struct export_args export;
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int error, flag = 0;
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struct vattr va;
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struct nameidata nd;
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struct vnode *vp;
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int error;
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mtx_assert(&Giant, MA_OWNED);
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/*
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* Be ultra-paranoid about making sure the type and fspath
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* variables will fit in our mp buffers, including the
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@ -865,226 +1109,30 @@ vfs_domount(
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if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
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return (EPERM);
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}
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/*
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* Get vnode to be covered
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* Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
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*/
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE,
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fspath, td);
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if ((error = namei(&nd)) != 0)
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
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UIO_SYSSPACE, fspath, td);
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error = namei(&nd);
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if (error != 0)
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return (error);
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if (!NDHASGIANT(&nd))
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mtx_lock(&Giant);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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vp = nd.ni_vp;
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if (fsflags & MNT_UPDATE) {
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if ((vp->v_vflag & VV_ROOT) == 0) {
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vput(vp);
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return (EINVAL);
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}
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mp = vp->v_mount;
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MNT_ILOCK(mp);
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flag = mp->mnt_flag;
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/*
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* We only allow the filesystem to be reloaded if it
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* is currently mounted read-only.
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*/
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if ((fsflags & MNT_RELOAD) &&
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((mp->mnt_flag & MNT_RDONLY) == 0)) {
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MNT_IUNLOCK(mp);
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vput(vp);
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return (EOPNOTSUPP); /* Needs translation */
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}
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MNT_IUNLOCK(mp);
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/*
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* Only privileged root, or (if MNT_USER is set) the user that
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* did the original mount is permitted to update it.
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*/
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error = vfs_suser(mp, td);
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if (error) {
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vput(vp);
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return (error);
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}
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if (vfs_busy(mp, MBF_NOWAIT)) {
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vput(vp);
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return (EBUSY);
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}
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VI_LOCK(vp);
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if ((vp->v_iflag & VI_MOUNT) != 0 ||
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vp->v_mountedhere != NULL) {
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VI_UNLOCK(vp);
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vfs_unbusy(mp);
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vput(vp);
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return (EBUSY);
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}
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vp->v_iflag |= VI_MOUNT;
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VI_UNLOCK(vp);
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MNT_ILOCK(mp);
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mp->mnt_flag |= fsflags &
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(MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS);
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MNT_IUNLOCK(mp);
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VOP_UNLOCK(vp, 0);
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mp->mnt_optnew = fsdata;
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vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
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if ((fsflags & MNT_UPDATE) == 0) {
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error = vfs_domount_first(td, vfsp, fspath, vp, fsflags,
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fsdata);
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} else {
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/*
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* If the user is not root, ensure that they own the directory
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* onto which we are attempting to mount.
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*/
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error = VOP_GETATTR(vp, &va, td->td_ucred);
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if (error) {
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vput(vp);
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return (error);
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}
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if (va.va_uid != td->td_ucred->cr_uid) {
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error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN,
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0);
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if (error) {
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vput(vp);
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return (error);
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}
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}
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error = vinvalbuf(vp, V_SAVE, 0, 0);
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if (error != 0) {
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vput(vp);
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return (error);
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}
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if (vp->v_type != VDIR) {
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vput(vp);
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return (ENOTDIR);
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}
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VI_LOCK(vp);
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if ((vp->v_iflag & VI_MOUNT) != 0 ||
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vp->v_mountedhere != NULL) {
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VI_UNLOCK(vp);
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vput(vp);
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return (EBUSY);
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}
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vp->v_iflag |= VI_MOUNT;
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VI_UNLOCK(vp);
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VOP_UNLOCK(vp, 0);
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/*
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* Allocate and initialize the filesystem.
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*/
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mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
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/* XXXMAC: pass to vfs_mount_alloc? */
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mp->mnt_optnew = fsdata;
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error = vfs_domount_update(td, vp, fsflags, fsdata);
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}
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mtx_unlock(&Giant);
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/*
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* Set the mount level flags.
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*/
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MNT_ILOCK(mp);
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mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) |
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(fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS |
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MNT_RDONLY));
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if ((mp->mnt_flag & MNT_ASYNC) == 0)
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mp->mnt_kern_flag &= ~MNTK_ASYNC;
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MNT_IUNLOCK(mp);
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/*
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* Mount the filesystem.
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* XXX The final recipients of VFS_MOUNT just overwrite the ndp they
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* get. No freeing of cn_pnbuf.
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*/
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error = VFS_MOUNT(mp);
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ASSERT_VI_UNLOCKED(vp, __func__);
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ASSERT_VOP_UNLOCKED(vp, __func__);
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/*
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* Process the export option only if we are
|
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* updating mount options.
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*/
|
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if (!error && (fsflags & MNT_UPDATE)) {
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if (vfs_copyopt(mp->mnt_optnew, "export", &export,
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sizeof(export)) == 0)
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error = vfs_export(mp, &export);
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else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport,
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sizeof(oexport)) == 0) {
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export.ex_flags = oexport.ex_flags;
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export.ex_root = oexport.ex_root;
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export.ex_anon = oexport.ex_anon;
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export.ex_addr = oexport.ex_addr;
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export.ex_addrlen = oexport.ex_addrlen;
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export.ex_mask = oexport.ex_mask;
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export.ex_masklen = oexport.ex_masklen;
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export.ex_indexfile = oexport.ex_indexfile;
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export.ex_numsecflavors = 0;
|
||||
error = vfs_export(mp, &export);
|
||||
}
|
||||
}
|
||||
|
||||
if (!error) {
|
||||
if (mp->mnt_opt != NULL)
|
||||
vfs_freeopts(mp->mnt_opt);
|
||||
mp->mnt_opt = mp->mnt_optnew;
|
||||
(void)VFS_STATFS(mp, &mp->mnt_stat);
|
||||
}
|
||||
/*
|
||||
* Prevent external consumers of mount options from reading
|
||||
* mnt_optnew.
|
||||
*/
|
||||
mp->mnt_optnew = NULL;
|
||||
if (mp->mnt_flag & MNT_UPDATE) {
|
||||
MNT_ILOCK(mp);
|
||||
if (error)
|
||||
mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) |
|
||||
(flag & ~MNT_QUOTA);
|
||||
else
|
||||
mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD |
|
||||
MNT_FORCE | MNT_SNAPSHOT);
|
||||
if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
|
||||
mp->mnt_kern_flag |= MNTK_ASYNC;
|
||||
else
|
||||
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
||||
MNT_IUNLOCK(mp);
|
||||
if ((mp->mnt_flag & MNT_RDONLY) == 0) {
|
||||
if (mp->mnt_syncer == NULL)
|
||||
vfs_allocate_syncvnode(mp);
|
||||
} else {
|
||||
if (mp->mnt_syncer != NULL)
|
||||
vrele(mp->mnt_syncer);
|
||||
mp->mnt_syncer = NULL;
|
||||
}
|
||||
vfs_unbusy(mp);
|
||||
VI_LOCK(vp);
|
||||
vp->v_iflag &= ~VI_MOUNT;
|
||||
VI_UNLOCK(vp);
|
||||
vrele(vp);
|
||||
return (error);
|
||||
}
|
||||
MNT_ILOCK(mp);
|
||||
if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0)
|
||||
mp->mnt_kern_flag |= MNTK_ASYNC;
|
||||
else
|
||||
mp->mnt_kern_flag &= ~MNTK_ASYNC;
|
||||
MNT_IUNLOCK(mp);
|
||||
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
||||
/*
|
||||
* Put the new filesystem on the mount list after root.
|
||||
*/
|
||||
cache_purge(vp);
|
||||
VI_LOCK(vp);
|
||||
vp->v_iflag &= ~VI_MOUNT;
|
||||
VI_UNLOCK(vp);
|
||||
if (!error) {
|
||||
struct vnode *newdp;
|
||||
|
||||
vp->v_mountedhere = mp;
|
||||
mtx_lock(&mountlist_mtx);
|
||||
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
||||
mtx_unlock(&mountlist_mtx);
|
||||
vfs_event_signal(NULL, VQ_MOUNT, 0);
|
||||
if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
|
||||
panic("mount: lost mount");
|
||||
VOP_UNLOCK(newdp, 0);
|
||||
VOP_UNLOCK(vp, 0);
|
||||
mountcheckdirs(vp, newdp);
|
||||
vrele(newdp);
|
||||
if ((mp->mnt_flag & MNT_RDONLY) == 0)
|
||||
vfs_allocate_syncvnode(mp);
|
||||
vfs_unbusy(mp);
|
||||
} else {
|
||||
vfs_unbusy(mp);
|
||||
vfs_mount_destroy(mp);
|
||||
vput(vp);
|
||||
}
|
||||
return (error);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user