Exemplo n.º 1
0
static int
tmpfs_remove(struct vop_remove_args *v)
{
	struct vnode *dvp = v->a_dvp;
	struct vnode *vp = v->a_vp;

	int error;
	struct tmpfs_dirent *de;
	struct tmpfs_mount *tmp;
	struct tmpfs_node *dnode;
	struct tmpfs_node *node;

	MPASS(VOP_ISLOCKED(dvp));
	MPASS(VOP_ISLOCKED(vp));

	if (vp->v_type == VDIR) {
		error = EISDIR;
		goto out;
	}

	dnode = VP_TO_TMPFS_DIR(dvp);
	node = VP_TO_TMPFS_NODE(vp);
	tmp = VFS_TO_TMPFS(vp->v_mount);
	de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
	MPASS(de != NULL);

	/* Files marked as immutable or append-only cannot be deleted. */
	if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
	    (dnode->tn_flags & APPEND)) {
		error = EPERM;
		goto out;
	}

	/* Remove the entry from the directory; as it is a file, we do not
	 * have to change the number of hard links of the directory. */
	tmpfs_dir_detach(dvp, de);
	if (v->a_cnp->cn_flags & DOWHITEOUT)
		tmpfs_dir_whiteout_add(dvp, v->a_cnp);

	/* 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(tmp, de, TRUE);

	node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
	error = 0;

out:

	return error;
}
Exemplo n.º 2
0
static int
tmpfs_nremove(struct vop_nremove_args *v)
{
	struct vnode *dvp = v->a_dvp;
	struct namecache *ncp = v->a_nch->ncp;
	struct vnode *vp;
	int error;
	struct tmpfs_dirent *de;
	struct tmpfs_mount *tmp;
	struct tmpfs_node *dnode;
	struct tmpfs_node *node;
	struct mount *mp;

	mp = dvp->v_mount;

	/*
	 * We have to acquire the vp from v->a_nch because we will likely
	 * unresolve the namecache entry, and a vrele/vput is needed to
	 * trigger the tmpfs_inactive/tmpfs_reclaim sequence.
	 *
	 * We have to use vget to clear any inactive state on the vnode,
	 * otherwise the vnode may remain inactive and thus tmpfs_inactive
	 * will not get called when we release it.
	 */
	error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
	KKASSERT(vp->v_mount == dvp->v_mount);
	KKASSERT(error == 0);
	vn_unlock(vp);

	if (vp->v_type == VDIR) {
		error = EISDIR;
		goto out2;
	}

	dnode = VP_TO_TMPFS_DIR(dvp);
	node = VP_TO_TMPFS_NODE(vp);
	tmp = VFS_TO_TMPFS(vp->v_mount);

	TMPFS_NODE_LOCK(dnode);
	de = tmpfs_dir_lookup(dnode, node, ncp);
	if (de == NULL) {
		error = ENOENT;
		goto out;
	}

	/* Files marked as immutable or append-only cannot be deleted. */
	if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
	    (dnode->tn_flags & APPEND)) {
		error = EPERM;
		goto out;
	}

	/* Remove the entry from the directory; as it is a file, we do not
	 * have to change the number of hard links of the directory. */
	tmpfs_dir_detach(dnode, 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(tmp, de);

	if (node->tn_links > 0) {
	        TMPFS_NODE_LOCK(node);
		node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
	                TMPFS_NODE_MODIFIED;
	        TMPFS_NODE_UNLOCK(node);
	}

	cache_unlink(v->a_nch);
	tmpfs_knote(vp, NOTE_DELETE);
	error = 0;

out:
	TMPFS_NODE_UNLOCK(dnode);
	if (error == 0)
		tmpfs_knote(dvp, NOTE_WRITE);
out2:
	vrele(vp);

	return error;
}
Exemplo n.º 3
0
static int
tmpfs_nrmdir(struct vop_nrmdir_args *v)
{
	struct vnode *dvp = v->a_dvp;
	struct namecache *ncp = v->a_nch->ncp;
	struct vnode *vp;
	struct tmpfs_dirent *de;
	struct tmpfs_mount *tmp;
	struct tmpfs_node *dnode;
	struct tmpfs_node *node;
	struct mount *mp;
	int error;

	mp = dvp->v_mount;

	/*
	 * We have to acquire the vp from v->a_nch because we will likely
	 * unresolve the namecache entry, and a vrele/vput is needed to
	 * trigger the tmpfs_inactive/tmpfs_reclaim sequence.
	 *
	 * We have to use vget to clear any inactive state on the vnode,
	 * otherwise the vnode may remain inactive and thus tmpfs_inactive
	 * will not get called when we release it.
	 */
	error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
	KKASSERT(error == 0);
	vn_unlock(vp);

	/*
	 * Prevalidate so we don't hit an assertion later
	 */
	if (vp->v_type != VDIR) {
		error = ENOTDIR;
		goto out;
	}

	tmp = VFS_TO_TMPFS(dvp->v_mount);
	dnode = VP_TO_TMPFS_DIR(dvp);
	node = VP_TO_TMPFS_DIR(vp);

	/*
	 * Directories with more than two entries ('.' and '..') cannot
	 * be removed.
	 */
	if (node->tn_size > 0) {
		error = ENOTEMPTY;
		goto out;
	}

	if ((dnode->tn_flags & APPEND)
	    || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
		error = EPERM;
		goto out;
	}

	/*
	 * This invariant holds only if we are not trying to
	 * remove "..".  We checked for that above so this is safe now.
	 */
	KKASSERT(node->tn_dir.tn_parent == dnode);

	/*
	 * Get the directory entry associated with node (vp).  This
	 * was filled by tmpfs_lookup while looking up the entry.
	 */
	TMPFS_NODE_LOCK(dnode);
	de = tmpfs_dir_lookup(dnode, node, ncp);
	KKASSERT(TMPFS_DIRENT_MATCHES(de, ncp->nc_name, ncp->nc_nlen));

	/* Check flags to see if we are allowed to remove the directory. */
	if ((dnode->tn_flags & APPEND) ||
	    node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
		error = EPERM;
		TMPFS_NODE_UNLOCK(dnode);
		goto out;
	}

	/* Detach the directory entry from the directory (dnode). */
	tmpfs_dir_detach(dnode, de);
	TMPFS_NODE_UNLOCK(dnode);

	/* No vnode should be allocated for this entry from this point */
	TMPFS_NODE_LOCK(dnode);
	TMPFS_ASSERT_ELOCKED(dnode);
	TMPFS_NODE_LOCK(node);
	TMPFS_ASSERT_ELOCKED(node);

	/*
	 * Must set parent linkage to NULL (tested by ncreate to disallow
	 * the creation of new files/dirs in a deleted directory)
	 */
	node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
			   TMPFS_NODE_MODIFIED;

	dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
			    TMPFS_NODE_MODIFIED;

	TMPFS_NODE_UNLOCK(node);
	TMPFS_NODE_UNLOCK(dnode);

	/* 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(tmp, de);

	/* Release the deleted vnode (will destroy the node, notify
	 * interested parties and clean it from the cache). */

	TMPFS_NODE_LOCK(dnode);
	dnode->tn_status |= TMPFS_NODE_CHANGED;
	TMPFS_NODE_UNLOCK(dnode);
	tmpfs_update(dvp);

	cache_unlink(v->a_nch);
	tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
	error = 0;

out:
	vrele(vp);

	return error;
}
Exemplo n.º 4
0
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;
}
Exemplo n.º 5
0
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;
}
Exemplo n.º 6
0
static int
tmpfs_rmdir(struct vop_rmdir_args *v)
{
	struct vnode *dvp = v->a_dvp;
	struct vnode *vp = v->a_vp;

	int error;
	struct tmpfs_dirent *de;
	struct tmpfs_mount *tmp;
	struct tmpfs_node *dnode;
	struct tmpfs_node *node;

	MPASS(VOP_ISLOCKED(dvp));
	MPASS(VOP_ISLOCKED(vp));

	tmp = VFS_TO_TMPFS(dvp->v_mount);
	dnode = VP_TO_TMPFS_DIR(dvp);
	node = VP_TO_TMPFS_DIR(vp);

	/* Directories with more than two entries ('.' and '..') cannot be
	 * removed. */
	 if (node->tn_size > 0) {
		 error = ENOTEMPTY;
		 goto out;
	 }

	if ((dnode->tn_flags & APPEND)
	    || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
		error = EPERM;
		goto out;
	}

	/* This invariant holds only if we are not trying to remove "..".
	  * We checked for that above so this is safe now. */
	MPASS(node->tn_dir.tn_parent == dnode);

	/* Get the directory entry associated with node (vp).  This was
	 * filled by tmpfs_lookup while looking up the entry. */
	de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
	MPASS(TMPFS_DIRENT_MATCHES(de,
	    v->a_cnp->cn_nameptr,
	    v->a_cnp->cn_namelen));

	/* Check flags to see if we are allowed to remove the directory. */
	if (dnode->tn_flags & APPEND
		|| node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
		error = EPERM;
		goto out;
	}


	/* Detach the directory entry from the directory (dnode). */
	tmpfs_dir_detach(dvp, de);
	if (v->a_cnp->cn_flags & DOWHITEOUT)
		tmpfs_dir_whiteout_add(dvp, v->a_cnp);

	/* No vnode should be allocated for this entry from this point */
	TMPFS_NODE_LOCK(node);
	TMPFS_ASSERT_ELOCKED(node);
	node->tn_links--;
	node->tn_dir.tn_parent = NULL;
	node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
	    TMPFS_NODE_MODIFIED;

	TMPFS_NODE_UNLOCK(node);

	TMPFS_NODE_LOCK(dnode);
	TMPFS_ASSERT_ELOCKED(dnode);
	dnode->tn_links--;
	dnode->tn_status |= TMPFS_NODE_ACCESSED | \
	    TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
	TMPFS_NODE_UNLOCK(dnode);

	cache_purge(dvp);
	cache_purge(vp);

	/* 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(tmp, de, TRUE);

	/* Release the deleted vnode (will destroy the node, notify
	 * interested parties and clean it from the cache). */

	dnode->tn_status |= TMPFS_NODE_CHANGED;
	tmpfs_update(dvp);

	error = 0;

out:
	return error;
}
Exemplo n.º 7
0
/*
 * 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;
}