static int tmpfs_link(struct vop_link_args *v) { struct vnode *dvp = v->a_tdvp; struct vnode *vp = v->a_vp; struct componentname *cnp = v->a_cnp; int error; struct tmpfs_dirent *de; struct tmpfs_node *node; MPASS(VOP_ISLOCKED(dvp)); MPASS(cnp->cn_flags & HASBUF); MPASS(dvp != vp); /* XXX When can this be false? */ node = VP_TO_TMPFS_NODE(vp); /* Ensure that we do not overflow the maximum number of links imposed * by the system. */ MPASS(node->tn_links <= LINK_MAX); if (node->tn_links == LINK_MAX) { error = EMLINK; goto out; } /* We cannot create links of files marked immutable or append-only. */ if (node->tn_flags & (IMMUTABLE | APPEND)) { error = EPERM; goto out; } /* Allocate a new directory entry to represent the node. */ error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, cnp->cn_nameptr, cnp->cn_namelen, &de); if (error != 0) goto out; /* Insert the new directory entry into the appropriate directory. */ if (cnp->cn_flags & ISWHITEOUT) tmpfs_dir_whiteout_remove(dvp, cnp); tmpfs_dir_attach(dvp, de); /* vp link count has changed, so update node times. */ node->tn_status |= TMPFS_NODE_CHANGED; tmpfs_update(vp); error = 0; out: return error; }
static int tmpfs_nlink(struct vop_nlink_args *v) { struct vnode *dvp = v->a_dvp; struct vnode *vp = v->a_vp; struct namecache *ncp = v->a_nch->ncp; struct tmpfs_dirent *de; struct tmpfs_node *node; struct tmpfs_node *dnode; struct mount *mp; int error; mp = dvp->v_mount; KKASSERT(dvp != vp); /* XXX When can this be false? */ node = VP_TO_TMPFS_NODE(vp); dnode = VP_TO_TMPFS_NODE(dvp); TMPFS_NODE_LOCK(dnode); /* XXX: Why aren't the following two tests done by the caller? */ /* Hard links of directories are forbidden. */ if (vp->v_type == VDIR) { error = EPERM; goto out; } /* Cannot create cross-device links. */ if (dvp->v_mount != vp->v_mount) { error = EXDEV; goto out; } /* Ensure that we do not overflow the maximum number of links imposed * by the system. */ KKASSERT(node->tn_links <= LINK_MAX); if (node->tn_links >= LINK_MAX) { error = EMLINK; goto out; } /* We cannot create links of files marked immutable or append-only. */ if (node->tn_flags & (IMMUTABLE | APPEND)) { error = EPERM; goto out; } /* Allocate a new directory entry to represent the node. */ error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, ncp->nc_name, ncp->nc_nlen, &de); if (error != 0) goto out; /* Insert the new directory entry into the appropriate directory. */ tmpfs_dir_attach(dnode, de); /* vp link count has changed, so update node times. */ TMPFS_NODE_LOCK(node); node->tn_status |= TMPFS_NODE_CHANGED; TMPFS_NODE_UNLOCK(node); tmpfs_update(vp); tmpfs_knote(vp, NOTE_LINK); cache_setunresolved(v->a_nch); cache_setvp(v->a_nch, vp); error = 0; out: TMPFS_NODE_UNLOCK(dnode); if (error == 0) tmpfs_knote(dvp, NOTE_WRITE); return error; }
static int tmpfs_nrename(struct vop_nrename_args *v) { struct vnode *fdvp = v->a_fdvp; struct namecache *fncp = v->a_fnch->ncp; struct vnode *fvp = fncp->nc_vp; struct vnode *tdvp = v->a_tdvp; struct namecache *tncp = v->a_tnch->ncp; struct vnode *tvp; struct tmpfs_dirent *de, *tde; struct tmpfs_mount *tmp; struct tmpfs_node *fdnode; struct tmpfs_node *fnode; struct tmpfs_node *tnode; struct tmpfs_node *tdnode; struct mount *mp; char *newname; char *oldname; int error; mp = fdvp->v_mount; KKASSERT(fdvp->v_mount == fvp->v_mount); /* * Because tvp can get overwritten we have to vget it instead of * just vref or use it, otherwise it's VINACTIVE flag may not get * cleared and the node won't get destroyed. */ error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp); if (error == 0) { tnode = VP_TO_TMPFS_NODE(tvp); vn_unlock(tvp); } else { tnode = NULL; } /* Disallow cross-device renames. * XXX Why isn't this done by the caller? */ if (fvp->v_mount != tdvp->v_mount || (tvp != NULL && fvp->v_mount != tvp->v_mount)) { error = EXDEV; goto out; } tmp = VFS_TO_TMPFS(tdvp->v_mount); tdnode = VP_TO_TMPFS_DIR(tdvp); /* If source and target are the same file, there is nothing to do. */ if (fvp == tvp) { error = 0; goto out; } fdnode = VP_TO_TMPFS_DIR(fdvp); fnode = VP_TO_TMPFS_NODE(fvp); TMPFS_NODE_LOCK(fdnode); de = tmpfs_dir_lookup(fdnode, fnode, fncp); TMPFS_NODE_UNLOCK(fdnode); /* XXX depend on namecache lock */ /* Avoid manipulating '.' and '..' entries. */ if (de == NULL) { error = ENOENT; goto out_locked; } KKASSERT(de->td_node == fnode); /* * If replacing an entry in the target directory and that entry * is a directory, it must be empty. * * Kern_rename gurantees the destination to be a directory * if the source is one (it does?). */ if (tvp != NULL) { KKASSERT(tnode != NULL); if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (tdnode->tn_flags & (APPEND | IMMUTABLE))) { error = EPERM; goto out_locked; } if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { if (tnode->tn_size > 0) { error = ENOTEMPTY; goto out_locked; } } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { error = ENOTDIR; goto out_locked; } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { error = EISDIR; goto out_locked; } else { KKASSERT(fnode->tn_type != VDIR && tnode->tn_type != VDIR); } } if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { error = EPERM; goto out_locked; } /* * Ensure that we have enough memory to hold the new name, if it * has to be changed. */ if (fncp->nc_nlen != tncp->nc_nlen || bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) { newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone, M_WAITOK | M_NULLOK); if (newname == NULL) { error = ENOSPC; goto out_locked; } bcopy(tncp->nc_name, newname, tncp->nc_nlen); newname[tncp->nc_nlen] = '\0'; } else { newname = NULL; } /* * Unlink entry from source directory. Note that the kernel has * already checked for illegal recursion cases (renaming a directory * into a subdirectory of itself). */ if (fdnode != tdnode) { tmpfs_dir_detach(fdnode, de); } else { /* XXX depend on namecache lock */ TMPFS_NODE_LOCK(fdnode); KKASSERT(de == tmpfs_dir_lookup(fdnode, fnode, fncp)); RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de); RB_REMOVE(tmpfs_dirtree_cookie, &fdnode->tn_dir.tn_cookietree, de); TMPFS_NODE_UNLOCK(fdnode); } /* * Handle any name change. Swap with newname, we will * deallocate it at the end. */ if (newname != NULL) { #if 0 TMPFS_NODE_LOCK(fnode); fnode->tn_status |= TMPFS_NODE_CHANGED; TMPFS_NODE_UNLOCK(fnode); #endif oldname = de->td_name; de->td_name = newname; de->td_namelen = (uint16_t)tncp->nc_nlen; newname = oldname; } /* * If we are overwriting an entry, we have to remove the old one * from the target directory. */ if (tvp != NULL) { /* Remove the old entry from the target directory. */ TMPFS_NODE_LOCK(tdnode); tde = tmpfs_dir_lookup(tdnode, tnode, tncp); tmpfs_dir_detach(tdnode, tde); TMPFS_NODE_UNLOCK(tdnode); tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE); /* * Free the directory entry we just deleted. Note that the * node referred by it will not be removed until the vnode is * really reclaimed. */ tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); /*cache_inval_vp(tvp, CINV_DESTROY);*/ } /* * Link entry to target directory. If the entry * represents a directory move the parent linkage * as well. */ if (fdnode != tdnode) { if (de->td_node->tn_type == VDIR) { TMPFS_VALIDATE_DIR(fnode); } tmpfs_dir_attach(tdnode, de); } else { TMPFS_NODE_LOCK(tdnode); tdnode->tn_status |= TMPFS_NODE_MODIFIED; RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de); RB_INSERT(tmpfs_dirtree_cookie, &tdnode->tn_dir.tn_cookietree, de); TMPFS_NODE_UNLOCK(tdnode); } /* * Finish up */ if (newname) { kfree(newname, tmp->tm_name_zone); newname = NULL; } cache_rename(v->a_fnch, v->a_tnch); tmpfs_knote(v->a_fdvp, NOTE_WRITE); tmpfs_knote(v->a_tdvp, NOTE_WRITE); if (fnode->tn_vnode) tmpfs_knote(fnode->tn_vnode, NOTE_RENAME); error = 0; out_locked: ; out: if (tvp) vrele(tvp); return error; }
static int tmpfs_rename(struct vop_rename_args *v) { struct vnode *fdvp = v->a_fdvp; struct vnode *fvp = v->a_fvp; struct componentname *fcnp = v->a_fcnp; struct vnode *tdvp = v->a_tdvp; struct vnode *tvp = v->a_tvp; struct componentname *tcnp = v->a_tcnp; char *newname; int error; struct tmpfs_dirent *de; struct tmpfs_mount *tmp; struct tmpfs_node *fdnode; struct tmpfs_node *fnode; struct tmpfs_node *tnode; struct tmpfs_node *tdnode; MPASS(VOP_ISLOCKED(tdvp)); MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); MPASS(fcnp->cn_flags & HASBUF); MPASS(tcnp->cn_flags & HASBUF); tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); /* Disallow cross-device renames. * XXX Why isn't this done by the caller? */ if (fvp->v_mount != tdvp->v_mount || (tvp != NULL && fvp->v_mount != tvp->v_mount)) { error = EXDEV; goto out; } tmp = VFS_TO_TMPFS(tdvp->v_mount); tdnode = VP_TO_TMPFS_DIR(tdvp); /* If source and target are the same file, there is nothing to do. */ if (fvp == tvp) { error = 0; goto out; } /* If we need to move the directory between entries, lock the * source so that we can safely operate on it. */ if (fdvp != tdvp && fdvp != tvp) vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY); fdnode = VP_TO_TMPFS_DIR(fdvp); fnode = VP_TO_TMPFS_NODE(fvp); de = tmpfs_dir_lookup(fdnode, fnode, fcnp); /* Entry can disappear before we lock fdvp, * also avoid manipulating '.' and '..' entries. */ if (de == NULL) { if ((fcnp->cn_flags & ISDOTDOT) != 0 || (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) error = EINVAL; else error = ENOENT; goto out_locked; } MPASS(de->td_node == fnode); /* If re-naming a directory to another preexisting directory * ensure that the target directory is empty so that its * removal causes no side effects. * Kern_rename gurantees the destination to be a directory * if the source is one. */ if (tvp != NULL) { MPASS(tnode != NULL); if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (tdnode->tn_flags & (APPEND | IMMUTABLE))) { error = EPERM; goto out_locked; } if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { if (tnode->tn_size > 0) { error = ENOTEMPTY; goto out_locked; } } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { error = ENOTDIR; goto out_locked; } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { error = EISDIR; goto out_locked; } else { MPASS(fnode->tn_type != VDIR && tnode->tn_type != VDIR); } } if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { error = EPERM; goto out_locked; } /* Ensure that we have enough memory to hold the new name, if it * has to be changed. */ if (fcnp->cn_namelen != tcnp->cn_namelen || bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); } else newname = NULL; /* If the node is being moved to another directory, we have to do * the move. */ if (fdnode != tdnode) { /* In case we are moving a directory, we have to adjust its * parent to point to the new parent. */ if (de->td_node->tn_type == VDIR) { struct tmpfs_node *n; /* Ensure the target directory is not a child of the * directory being moved. Otherwise, we'd end up * with stale nodes. */ n = tdnode; /* TMPFS_LOCK garanties that no nodes are freed while * traversing the list. Nodes can only be marked as * removed: tn_parent == NULL. */ TMPFS_LOCK(tmp); TMPFS_NODE_LOCK(n); while (n != n->tn_dir.tn_parent) { struct tmpfs_node *parent; if (n == fnode) { TMPFS_NODE_UNLOCK(n); TMPFS_UNLOCK(tmp); error = EINVAL; if (newname != NULL) free(newname, M_TMPFSNAME); goto out_locked; } parent = n->tn_dir.tn_parent; TMPFS_NODE_UNLOCK(n); if (parent == NULL) { n = NULL; break; } TMPFS_NODE_LOCK(parent); if (parent->tn_dir.tn_parent == NULL) { TMPFS_NODE_UNLOCK(parent); n = NULL; break; } n = parent; } TMPFS_UNLOCK(tmp); if (n == NULL) { error = EINVAL; if (newname != NULL) free(newname, M_TMPFSNAME); goto out_locked; } TMPFS_NODE_UNLOCK(n); /* Adjust the parent pointer. */ TMPFS_VALIDATE_DIR(fnode); TMPFS_NODE_LOCK(de->td_node); de->td_node->tn_dir.tn_parent = tdnode; TMPFS_NODE_UNLOCK(de->td_node); /* As a result of changing the target of the '..' * entry, the link count of the source and target * directories has to be adjusted. */ TMPFS_NODE_LOCK(tdnode); TMPFS_ASSERT_LOCKED(tdnode); tdnode->tn_links++; TMPFS_NODE_UNLOCK(tdnode); TMPFS_NODE_LOCK(fdnode); TMPFS_ASSERT_LOCKED(fdnode); fdnode->tn_links--; TMPFS_NODE_UNLOCK(fdnode); } /* Do the move: just remove the entry from the source directory * and insert it into the target one. */ tmpfs_dir_detach(fdvp, de); if (fcnp->cn_flags & DOWHITEOUT) tmpfs_dir_whiteout_add(fdvp, fcnp); if (tcnp->cn_flags & ISWHITEOUT) tmpfs_dir_whiteout_remove(tdvp, tcnp); tmpfs_dir_attach(tdvp, de); } /* If the name has changed, we need to make it effective by changing * it in the directory entry. */ if (newname != NULL) { MPASS(tcnp->cn_namelen <= MAXNAMLEN); free(de->td_name, M_TMPFSNAME); de->td_namelen = (uint16_t)tcnp->cn_namelen; memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); de->td_name = newname; fnode->tn_status |= TMPFS_NODE_CHANGED; tdnode->tn_status |= TMPFS_NODE_MODIFIED; } /* If we are overwriting an entry, we have to remove the old one * from the target directory. */ if (tvp != NULL) { /* Remove the old entry from the target directory. */ de = tmpfs_dir_lookup(tdnode, tnode, tcnp); tmpfs_dir_detach(tdvp, de); /* Free the directory entry we just deleted. Note that the * node referred by it will not be removed until the vnode is * really reclaimed. */ tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE); } cache_purge(fvp); error = 0; out_locked: if (fdvp != tdvp && fdvp != tvp) VOP_UNLOCK(fdvp, 0); out: /* Release target nodes. */ /* XXX: I don't understand when tdvp can be the same as tvp, but * other code takes care of this... */ if (tdvp == tvp) vrele(tdvp); else vput(tdvp); if (tvp != NULL) vput(tvp); /* Release source nodes. */ vrele(fdvp); vrele(fvp); return error; }
/* * Allocates a new file of type 'type' and adds it to the parent directory * 'dvp'; this addition is done using the component name given in 'cnp'. * The ownership of the new file is automatically assigned based on the * credentials of the caller (through 'cnp'), the group is set based on * the parent directory and the mode is determined from the 'vap' argument. * If successful, *vpp holds a vnode to the newly created file and zero * is returned. Otherwise *vpp is NULL and the function returns an * appropriate error code. */ int tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap, struct namecache *ncp, struct ucred *cred, char *target) { int error; struct tmpfs_dirent *de; struct tmpfs_mount *tmp; struct tmpfs_node *dnode; struct tmpfs_node *node; tmp = VFS_TO_TMPFS(dvp->v_mount); dnode = VP_TO_TMPFS_DIR(dvp); *vpp = NULL; /* * If the directory was removed but a process was CD'd into it, * we do not allow any more file/dir creation within it. Otherwise * we will lose track of it. */ KKASSERT(dnode->tn_type == VDIR); if (dnode != tmp->tm_root && dnode->tn_dir.tn_parent == NULL) return ENOENT; /* * Make sure the link count does not overflow. */ if (vap->va_type == VDIR && dnode->tn_links >= LINK_MAX) return EMLINK; /* Allocate a node that represents the new file. */ error = tmpfs_alloc_node(tmp, vap->va_type, cred->cr_uid, dnode->tn_gid, vap->va_mode, target, vap->va_rmajor, vap->va_rminor, &node); if (error != 0) return error; TMPFS_NODE_LOCK(node); /* Allocate a directory entry that points to the new file. */ error = tmpfs_alloc_dirent(tmp, node, ncp->nc_name, ncp->nc_nlen, &de); if (error != 0) { tmpfs_free_node(tmp, node); /* eats node lock */ return error; } /* Allocate a vnode for the new file. */ error = tmpfs_alloc_vp(dvp->v_mount, NULL, node, LK_EXCLUSIVE, vpp); if (error != 0) { tmpfs_free_dirent(tmp, de); tmpfs_free_node(tmp, node); /* eats node lock */ return error; } /* * Now that all required items are allocated, we can proceed to * insert the new node into the directory, an operation that * cannot fail. */ tmpfs_dir_attach(dnode, de); TMPFS_NODE_UNLOCK(node); return error; }