Example #1
0
/*
 * Rename system call.
 * 	rename("foo", "bar");
 * is essentially
 *	unlink("bar");
 *	link("foo", "bar");
 *	unlink("foo");
 * but ``atomically''.  Can't do full commit without saving state in the
 * inode on disk which isn't feasible at this time.  Best we can do is
 * always guarantee the target exists.
 *
 * Basic algorithm is:
 *
 * 1) Bump link count on source while we're linking it to the
 *    target.  This also ensure the inode won't be deleted out
 *    from underneath us while we work (it may be truncated by
 *    a concurrent `trunc' or `open' for creation).
 * 2) Link source to destination.  If destination already exists,
 *    delete it first.
 * 3) Unlink source reference to inode if still around. If a
 *    directory was moved and the parent of the destination
 *    is different from the source, patch the ".." entry in the
 *    directory.
 */
int
ext2fs_rename(void *v)
{
	struct vop_rename_args  *ap = v;
	struct vnode *tvp = ap->a_tvp;
	struct vnode *tdvp = ap->a_tdvp;
	struct vnode *fvp = ap->a_fvp;
	struct vnode *fdvp = ap->a_fdvp;
	struct componentname *tcnp = ap->a_tcnp;
	struct componentname *fcnp = ap->a_fcnp;
	struct inode *ip, *xp, *dp;
	struct proc *p = fcnp->cn_proc;
	struct ext2fs_dirtemplate dirbuf;
	/* struct timespec ts; */
	int doingdirectory = 0, oldparent = 0, newparent = 0;
	int error = 0;
	u_char namlen;

#ifdef DIAGNOSTIC
	if ((tcnp->cn_flags & HASBUF) == 0 ||
	    (fcnp->cn_flags & HASBUF) == 0)
		panic("ext2fs_rename: no name");
#endif
	/*
	 * Check for cross-device rename.
	 */
	if ((fvp->v_mount != tdvp->v_mount) ||
	    (tvp && (fvp->v_mount != tvp->v_mount))) {
		error = EXDEV;
abortit:
		VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */
		if (tdvp == tvp)
			vrele(tdvp);
		else
			vput(tdvp);
		if (tvp)
			vput(tvp);
		VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
		vrele(fdvp);
		vrele(fvp);
		return (error);
	}

	/*
	 * Check if just deleting a link name.
	 */
	if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
	    (VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) {
		error = EPERM;
		goto abortit;
	}
	if (fvp == tvp) {
		if (fvp->v_type == VDIR) {
			error = EINVAL;
			goto abortit;
		}

		/* Release destination completely. */
		VOP_ABORTOP(tdvp, tcnp);
		vput(tdvp);
		vput(tvp);

		/* Delete source. */
		vrele(fdvp);
		vrele(fvp);
		fcnp->cn_flags &= ~MODMASK;
		fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
		if ((fcnp->cn_flags & SAVESTART) == 0)
			panic("ext2fs_rename: lost from startdir");
		fcnp->cn_nameiop = DELETE;
		(void) vfs_relookup(fdvp, &fvp, fcnp);
		return (VOP_REMOVE(fdvp, fvp, fcnp));
	}
	if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0)
		goto abortit;
	dp = VTOI(fdvp);
	ip = VTOI(fvp);
	if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) {
		VOP_UNLOCK(fvp, 0);
		error = EMLINK;
		goto abortit;
	}
	if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
		(dp->i_e2fs_flags & EXT2_APPEND)) {
		VOP_UNLOCK(fvp, 0);
		error = EPERM;
		goto abortit;
	}
	if ((ip->i_e2fs_mode & IFMT) == IFDIR) {
		error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
		if (!error && tvp)
			error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred);
		if (error) {
			VOP_UNLOCK(fvp, 0);
			error = EACCES;
			goto abortit;
		}
		/*
		 * Avoid ".", "..", and aliases of "." for obvious reasons.
		 */
		if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
		    dp == ip ||
			(fcnp->cn_flags&ISDOTDOT) ||
			(tcnp->cn_flags & ISDOTDOT) ||
		    (ip->i_flag & IN_RENAME)) {
			VOP_UNLOCK(fvp, 0);
			error = EINVAL;
			goto abortit;
		}
		ip->i_flag |= IN_RENAME;
		oldparent = dp->i_number;
		doingdirectory++;
	}
	vrele(fdvp);

	/*
	 * When the target exists, both the directory
	 * and target vnodes are returned locked.
	 */
	dp = VTOI(tdvp);
	xp = NULL;
	if (tvp)
		xp = VTOI(tvp);

	/*
	 * 1) Bump link count while we're moving stuff
	 *    around.  If we crash somewhere before
	 *    completing our work, the link count
	 *    may be wrong, but correctable.
	 */
	ip->i_e2fs_nlink++;
	ip->i_flag |= IN_CHANGE;
	if ((error = ext2fs_update(ip, NULL, NULL, 1)) != 0) {
		VOP_UNLOCK(fvp, 0);
		goto bad;
	}

	/*
	 * If ".." must be changed (ie the directory gets a new
	 * parent) then the source directory must not be in the
	 * directory hierarchy above the target, as this would
	 * orphan everything below the source directory. Also
	 * the user must have write permission in the source so
	 * as to be able to change "..". We must repeat the call 
	 * to namei, as the parent directory is unlocked by the
	 * call to checkpath().
	 */
	error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred);
	VOP_UNLOCK(fvp, 0);
	if (oldparent != dp->i_number)
		newparent = dp->i_number;
	if (doingdirectory && newparent) {
		if (error)	/* write access check above */
			goto bad;
		if (xp != NULL)
			vput(tvp);
		error = ext2fs_checkpath(ip, dp, tcnp->cn_cred);
		if (error != 0)
			goto out;
		if ((tcnp->cn_flags & SAVESTART) == 0)
			panic("ext2fs_rename: lost to startdir");
		if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0)
			goto out;
		dp = VTOI(tdvp);
		xp = NULL;
		if (tvp)
			xp = VTOI(tvp);
	}
	/*
	 * 2) If target doesn't exist, link the target
	 *    to the source and unlink the source. 
	 *    Otherwise, rewrite the target directory
	 *    entry to reference the source inode and
	 *    expunge the original entry's existence.
	 */
	if (xp == NULL) {
		if (dp->i_dev != ip->i_dev)
			panic("rename: EXDEV");
		/*
		 * Account for ".." in new directory.
		 * When source and destination have the same
		 * parent we don't fool with the link count.
		 */
		if (doingdirectory && newparent) {
			if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) {
				error = EMLINK;
				goto bad;
			}
			dp->i_e2fs_nlink++;
			dp->i_flag |= IN_CHANGE;
			if ((error = ext2fs_update(dp, NULL, NULL, 1)) != 0)
				goto bad;
		}
		error = ext2fs_direnter(ip, tdvp, tcnp);
		if (error != 0) {
			if (doingdirectory && newparent) {
				dp->i_e2fs_nlink--;
				dp->i_flag |= IN_CHANGE;
				(void)ext2fs_update(dp, NULL, NULL, 1);
			}
			goto bad;
		}
		vput(tdvp);
	} else {
		if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
			panic("rename: EXDEV");
		/*
		 * Short circuit rename(foo, foo).
		 */
		if (xp->i_number == ip->i_number)
			panic("rename: same file");
		/*
		 * If the parent directory is "sticky", then the user must
		 * own the parent directory, or the destination of the rename,
		 * otherwise the destination may not be changed (except by
		 * root). This implements append-only directories.
		 */
		if ((dp->i_e2fs_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
		    tcnp->cn_cred->cr_uid != dp->i_e2fs_uid &&
		    xp->i_e2fs_uid != tcnp->cn_cred->cr_uid) {
			error = EPERM;
			goto bad;
		}
		/*
		 * Target must be empty if a directory and have no links
		 * to it. Also, ensure source and target are compatible
		 * (both directories, or both not directories).
		 */
		if ((xp->i_e2fs_mode & IFMT) == IFDIR) {
			if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
				xp->i_e2fs_nlink > 2) {
				error = ENOTEMPTY;
				goto bad;
			}
			if (!doingdirectory) {
				error = ENOTDIR;
				goto bad;
			}
			cache_purge(tdvp);
		} else if (doingdirectory) {
			error = EISDIR;
			goto bad;
		}
		error = ext2fs_dirrewrite(dp, ip, tcnp);
		if (error != 0)
			goto bad;
		/*
		 * If the target directory is in the same
		 * directory as the source directory,
		 * decrement the link count on the parent
		 * of the target directory.
		 */
		 if (doingdirectory && !newparent) {
			dp->i_e2fs_nlink--;
			dp->i_flag |= IN_CHANGE;
		}
		vput(tdvp);
		/*
		 * Adjust the link count of the target to
		 * reflect the dirrewrite above.  If this is
		 * a directory it is empty and there are
		 * no links to it, so we can squash the inode and
		 * any space associated with it.  We disallowed
		 * renaming over top of a directory with links to
		 * it above, as the remaining link would point to
		 * a directory without "." or ".." entries.
		 */
		xp->i_e2fs_nlink--;
		if (doingdirectory) {
			if (--xp->i_e2fs_nlink != 0)
				panic("rename: linked directory");
			error = ext2fs_truncate(xp, (off_t)0, IO_SYNC,
			    tcnp->cn_cred);
		}
		xp->i_flag |= IN_CHANGE;
		vput(tvp);
		xp = NULL;
	}

	/*
	 * 3) Unlink the source.
	 */
	fcnp->cn_flags &= ~MODMASK;
	fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
	if ((fcnp->cn_flags & SAVESTART) == 0)
		panic("ext2fs_rename: lost from startdir");
	(void) vfs_relookup(fdvp, &fvp, fcnp);
	if (fvp != NULL) {
		xp = VTOI(fvp);
		dp = VTOI(fdvp);
	} else {
		/*
		 * From name has disappeared.
		 */
		if (doingdirectory)
			panic("ext2fs_rename: lost dir entry");
		vrele(ap->a_fvp);
		return (0);
	}
	/*
	 * Ensure that the directory entry still exists and has not
	 * changed while the new name has been entered. If the source is
	 * a file then the entry may have been unlinked or renamed. In
	 * either case there is no further work to be done. If the source
	 * is a directory then it cannot have been rmdir'ed; its link
	 * count of three would cause a rmdir to fail with ENOTEMPTY.
	 * The IRENAME flag ensures that it cannot be moved by another
	 * rename.
	 */
	if (xp != ip) {
		if (doingdirectory)
			panic("ext2fs_rename: lost dir entry");
	} else {
		/*
		 * If the source is a directory with a
		 * new parent, the link count of the old
		 * parent directory must be decremented
		 * and ".." set to point to the new parent.
		 */
		if (doingdirectory && newparent) {
			dp->i_e2fs_nlink--;
			dp->i_flag |= IN_CHANGE;
			error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
				sizeof (struct ext2fs_dirtemplate), (off_t)0,
				UIO_SYSSPACE, IO_NODELOCKED, 
				tcnp->cn_cred, NULL, curproc);
			if (error == 0) {
					namlen = dirbuf.dotdot_namlen;
				if (namlen != 2 ||
				    dirbuf.dotdot_name[0] != '.' ||
				    dirbuf.dotdot_name[1] != '.') {
					ufs_dirbad(xp, (doff_t)12,
					    "ext2fs_rename: mangled dir");
				} else {
					dirbuf.dotdot_ino = h2fs32(newparent);
					(void) vn_rdwr(UIO_WRITE, fvp,
					    (caddr_t)&dirbuf,
					    sizeof (struct dirtemplate),
					    (off_t)0, UIO_SYSSPACE,
					    IO_NODELOCKED|IO_SYNC,
					    tcnp->cn_cred, NULL, curproc);
					cache_purge(fdvp);
				}
			}
		}
		error = ext2fs_dirremove(fdvp, fcnp);
		if (!error) {
			xp->i_e2fs_nlink--;
			xp->i_flag |= IN_CHANGE;
		}
		xp->i_flag &= ~IN_RENAME;
	}
	if (dp)
		vput(fdvp);
	if (xp)
		vput(fvp);
	vrele(ap->a_fvp);
	return (error);

bad:
	if (xp)
		vput(ITOV(xp));
	vput(ITOV(dp));
out:
	if (doingdirectory)
		ip->i_flag &= ~IN_RENAME;
	if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) {
		ip->i_e2fs_nlink--;
		ip->i_flag |= IN_CHANGE;
		vput(fvp);
	} else
		vrele(fvp);
	return (error);
}
Example #2
0
/*
 * ext2fs_gro_rename: Actually perform the rename operation.
 */
static int
ext2fs_gro_rename(struct mount *mp, kauth_cred_t cred,
    struct vnode *fdvp, struct componentname *fcnp,
    void *fde, struct vnode *fvp,
    struct vnode *tdvp, struct componentname *tcnp,
    void *tde, struct vnode *tvp)
{
	struct ufs_lookup_results *fulr = fde;
	struct ufs_lookup_results *tulr = tde;
	bool directory_p, reparent_p;
	int error;

	(void)mp;
	KASSERT(mp != NULL);
	KASSERT(fdvp != NULL);
	KASSERT(fcnp != NULL);
	KASSERT(fulr != NULL);
	KASSERT(fvp != NULL);
	KASSERT(tdvp != NULL);
	KASSERT(tcnp != NULL);
	KASSERT(tulr != NULL);
	KASSERT(fulr != tulr);
	KASSERT(fdvp != fvp);
	KASSERT(fdvp != tvp);
	KASSERT(tdvp != fvp);
	KASSERT(tdvp != tvp);
	KASSERT(fvp != tvp);
	KASSERT(fdvp->v_mount == mp);
	KASSERT(fvp->v_mount == mp);
	KASSERT(tdvp->v_mount == mp);
	KASSERT((tvp == NULL) || (tvp->v_mount == mp));
	KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE);
	KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE);
	KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE);
	KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE));

	/*
	 * We shall need to temporarily bump the link count, so make
	 * sure there is room to do so.
	 */
	if ((nlink_t)VTOI(fvp)->i_e2fs_nlink >= LINK_MAX)
		return EMLINK;

	directory_p = (fvp->v_type == VDIR);
	KASSERT(directory_p == ((VTOI(fvp)->i_e2fs_mode & IFMT) == IFDIR));
	KASSERT((tvp == NULL) || (directory_p == (tvp->v_type == VDIR)));
	KASSERT((tvp == NULL) || (directory_p ==
		((VTOI(tvp)->i_e2fs_mode & IFMT) == IFDIR)));

	reparent_p = (fdvp != tdvp);
	KASSERT(reparent_p == (VTOI(fdvp)->i_number != VTOI(tdvp)->i_number));

	/*
	 * Commence hacking of the data on disk.
	 */

	/*
	 * 1) Bump link count while we're moving stuff
	 *    around.  If we crash somewhere before
	 *    completing our work, the link count
	 *    may be wrong, but correctable.
	 */

	KASSERT((nlink_t)VTOI(fvp)->i_e2fs_nlink < LINK_MAX);
	VTOI(fvp)->i_e2fs_nlink++;
	VTOI(fvp)->i_flag |= IN_CHANGE;
	error = ext2fs_update(fvp, NULL, NULL, UPDATE_WAIT);
	if (error)
		goto whymustithurtsomuch;

	/*
	 * 2) If target doesn't exist, link the target
	 *    to the source and unlink the source.
	 *    Otherwise, rewrite the target directory
	 *    entry to reference the source inode and
	 *    expunge the original entry's existence.
	 */

	if (tvp == NULL) {
		/*
		 * Account for ".." in new directory.
		 * When source and destination have the same
		 * parent we don't fool with the link count.
		 */
		if (directory_p && reparent_p) {
			if ((nlink_t)VTOI(tdvp)->i_e2fs_nlink >= LINK_MAX) {
				error = EMLINK;
				goto whymustithurtsomuch;
			}
			KASSERT((nlink_t)VTOI(tdvp)->i_e2fs_nlink < LINK_MAX);
			VTOI(tdvp)->i_e2fs_nlink++;
			VTOI(tdvp)->i_flag |= IN_CHANGE;
			error = ext2fs_update(tdvp, NULL, NULL, UPDATE_WAIT);
			if (error) {
				/*
				 * Link count update didn't take --
				 * back out the in-memory link count.
				 */
				KASSERT(0 < VTOI(tdvp)->i_e2fs_nlink);
				VTOI(tdvp)->i_e2fs_nlink--;
				VTOI(tdvp)->i_flag |= IN_CHANGE;
				goto whymustithurtsomuch;
			}
		}

		error = ext2fs_direnter(VTOI(fvp), tdvp, tulr, tcnp);
		if (error) {
			if (directory_p && reparent_p) {
				/*
				 * Directory update didn't take, but
				 * the link count update did -- back
				 * out the in-memory link count and the
				 * on-disk link count.
				 */
				KASSERT(0 < VTOI(tdvp)->i_e2fs_nlink);
				VTOI(tdvp)->i_e2fs_nlink--;
				VTOI(tdvp)->i_flag |= IN_CHANGE;
				(void)ext2fs_update(tdvp, NULL, NULL,
				    UPDATE_WAIT);
			}
			goto whymustithurtsomuch;
		}
	} else {
		if (directory_p)
			/* XXX WTF?  Why purge here?  Why not purge others?  */
			cache_purge(tdvp);

		/*
		 * Make the target directory's entry for tcnp point at
		 * the source node.
		 */
		error = ext2fs_dirrewrite(VTOI(tdvp), tulr, VTOI(fvp), tcnp);
		if (error)
			goto whymustithurtsomuch;

		/*
		 * If the source and target are directories, and the
		 * target is in the same directory as the source,
		 * decrement the link count of the common parent
		 * directory, since we are removing the target from
		 * that directory.
		 */
		if (directory_p && !reparent_p) {
			KASSERT(fdvp == tdvp);
			/* XXX check, don't kassert */
			KASSERT(0 < VTOI(tdvp)->i_e2fs_nlink);
			VTOI(tdvp)->i_e2fs_nlink--;
			VTOI(tdvp)->i_flag |= IN_CHANGE;
		}

		/*
		 * Adjust the link count of the target to
		 * reflect the dirrewrite above.  If this is
		 * a directory it is empty and there are
		 * no links to it, so we can squash the inode and
		 * any space associated with it.  We disallowed
		 * renaming over top of a directory with links to
		 * it above, as the remaining link would point to
		 * a directory without "." or ".." entries.
		 */
		/* XXX check, don't kassert */
		KASSERT(0 < VTOI(tvp)->i_e2fs_nlink);
		VTOI(tvp)->i_e2fs_nlink--;
		if (directory_p) {
			/*
			 * XXX The ext2fs_dirempty call earlier does
			 * not guarantee anything about nlink.
			 */
			if (VTOI(tvp)->i_e2fs_nlink != 1)
				ufs_dirbad(VTOI(tvp), (doff_t)0,
				    "hard-linked directory");
			VTOI(tvp)->i_e2fs_nlink = 0;
			error = ext2fs_truncate(tvp, (off_t)0, IO_SYNC, cred);
#if 0			/* XXX This branch was not in ext2fs_rename!  */
			if (error)
				goto whymustithurtsomuch;
#endif
		}
		/*
		 * XXX Why is this here, and not above the preceding
		 * conditional?
		 */
		VTOI(tvp)->i_flag |= IN_CHANGE;
	}

	/*
	 * If the source is a directory with a new parent, the link
	 * count of the old parent directory must be decremented and
	 * ".." set to point to the new parent.
	 */
	if (directory_p && reparent_p) {
		error = ext2fs_rename_replace_dotdot(fvp, fdvp, tdvp, cred);
		if (error)
			goto whymustithurtsomuch;

		/* XXX WTF?  Why purge here?  Why not purge others?  */
		cache_purge(fdvp);
	}

	/*
	 * 3) Unlink the source.
	 */

	/*
	 * ext2fs_direnter may compact the directory in the process of
	 * inserting a new entry.  That may invalidate fulr, which we
	 * need in order to remove the old entry.  In that case, we
	 * need to recalculate what fulr should be.
	 */
	if (!reparent_p && (tvp == NULL) &&
	    ext2fs_rename_ulr_overlap_p(fulr, tulr)) {
		error = ext2fs_rename_recalculate_fulr(fdvp, fulr, tulr, fcnp);
#if 0				/* XXX */
		if (error)	/* XXX Try to back out changes?  */
			goto whymustithurtsomuch;
#endif
	}

	error = ext2fs_dirremove(fdvp, fulr, fcnp);
	if (error)
		goto whymustithurtsomuch;

	/*
	 * XXX Perhaps this should go at the top, in case the file
	 * system is modified but incompletely so because of an
	 * intermediate error.
	 */
	genfs_rename_knote(fdvp, fvp, tdvp, tvp,
	    ((tvp != NULL) && (VTOI(tvp)->i_e2fs_nlink == 0)));
#if 0				/* XXX */
	genfs_rename_cache_purge(fdvp, fvp, tdvp, tvp);
#endif

whymustithurtsomuch:
	KASSERT(0 < VTOI(fvp)->i_e2fs_nlink);
	VTOI(fvp)->i_e2fs_nlink--;
	VTOI(fvp)->i_flag |= IN_CHANGE;
	return error;
}
Example #3
0
/*
 * Allocate a new inode.
 */
int
ext2fs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
    struct componentname *cnp)
{
	struct inode *ip, *pdir;
	struct vnode *tvp;
	int error;

	pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
	if ((cnp->cn_flags & HASBUF) == 0)
		panic("ext2fs_makeinode: no name");
#endif
	*vpp = NULL;
	if ((mode & IFMT) == 0)
		mode |= IFREG;

	if ((error = ext2fs_inode_alloc(pdir, mode, cnp->cn_cred, &tvp)) 
	    != 0) {
		pool_put(&namei_pool, cnp->cn_pnbuf);
		vput(dvp);
		return (error);
	}
	ip = VTOI(tvp);
	ip->i_e2fs_gid = pdir->i_e2fs_gid;
	ip->i_e2fs_uid = cnp->cn_cred->cr_uid;
	ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
	ip->i_e2fs_mode = mode;
	tvp->v_type = IFTOVT(mode);	/* Rest init'd in getnewvnode(). */
	ip->i_e2fs_nlink = 1;
	if ((ip->i_e2fs_mode & ISGID) &&
		!groupmember(ip->i_e2fs_gid, cnp->cn_cred) &&
	    suser_ucred(cnp->cn_cred))
		ip->i_e2fs_mode &= ~ISGID;

	/*
	 * Make sure inode goes to disk before directory entry.
	 */
	if ((error = ext2fs_update(ip, NULL, NULL, 1)) != 0)
		goto bad;
	error = ext2fs_direnter(ip, dvp, cnp);
	if (error != 0)
		goto bad;
	if ((cnp->cn_flags & SAVESTART) == 0)
		pool_put(&namei_pool, cnp->cn_pnbuf);
	vput(dvp);
	*vpp = tvp;
	return (0);

bad:
	/*
	 * Write error occurred trying to update the inode
	 * or the directory so must deallocate the inode.
	 */
	pool_put(&namei_pool, cnp->cn_pnbuf);
	vput(dvp);
	ip->i_e2fs_nlink = 0;
	ip->i_flag |= IN_CHANGE;
	tvp->v_type = VNON;
	vput(tvp);
	return (error);
}
Example #4
0
/*
 * Mkdir system call
 */
int
ext2fs_mkdir(void *v)
{
	struct vop_mkdir_args *ap = v;
	struct vnode *dvp = ap->a_dvp;
	struct vattr *vap = ap->a_vap;
	struct componentname *cnp = ap->a_cnp;
	struct inode *ip, *dp;
	struct vnode *tvp;
	struct ext2fs_dirtemplate dirtemplate;
	mode_t dmode;
	int error;

#ifdef DIAGNOSTIC
	if ((cnp->cn_flags & HASBUF) == 0)
		panic("ext2fs_mkdir: no name");
#endif
	dp = VTOI(dvp);
	if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) {
		error = EMLINK;
		goto out;
	}
	dmode = vap->va_mode & ACCESSPERMS;
	dmode |= IFDIR;
	/*
	 * Must simulate part of ext2fs_makeinode here to acquire the inode,
	 * but not have it entered in the parent directory. The entry is
	 * made later after writing "." and ".." entries.
	 */
	if ((error = ext2fs_inode_alloc(dp, dmode, cnp->cn_cred, &tvp)) != 0)
		goto out;
	ip = VTOI(tvp);
	ip->i_e2fs_uid = cnp->cn_cred->cr_uid;
	ip->i_e2fs_gid = dp->i_e2fs_gid;
	ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
	ip->i_e2fs_mode = dmode;
	tvp->v_type = VDIR;	/* Rest init'd in getnewvnode(). */
	ip->i_e2fs_nlink = 2;
	error = ext2fs_update(ip, 1);

	/*
	 * Bump link count in parent directory
	 * to reflect work done below.  Should
	 * be done before reference is created
	 * so reparation is possible if we crash.
	 */
	dp->i_e2fs_nlink++;
	dp->i_flag |= IN_CHANGE;
	if ((error = ext2fs_update(dp, 1)) != 0)
		goto bad;

	/* Initialize directory with "." and ".." from static template. */
	memset(&dirtemplate, 0, sizeof(dirtemplate));
	dirtemplate.dot_ino = h2fs32(ip->i_number);
	dirtemplate.dot_reclen = h2fs16(12);
	dirtemplate.dot_namlen = 1;
	if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 &&
	    (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) {
		dirtemplate.dot_type = EXT2_FT_DIR;
	}
	dirtemplate.dot_name[0] = '.';
	dirtemplate.dotdot_ino = h2fs32(dp->i_number);
	dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12);
	dirtemplate.dotdot_namlen = 2;
	if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 &&
	    (ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) {
		dirtemplate.dotdot_type = EXT2_FT_DIR;
	}
	dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.';
	error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
	    sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
	    IO_NODELOCKED|IO_SYNC, cnp->cn_cred, NULL, curproc);
	if (error) {
		dp->i_e2fs_nlink--;
		dp->i_flag |= IN_CHANGE;
		goto bad;
	}
	if (VTOI(dvp)->i_e2fs->e2fs_bsize >
							VFSTOUFS(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
		panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */
	else {
		error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize);
  	        if (error) {
  	        	dp->i_e2fs_nlink--;
  	        	dp->i_flag |= IN_CHANGE;
  	        	goto bad;
  	        }
		ip->i_flag |= IN_CHANGE;
	}

	/* Directory set up, now install its entry in the parent directory. */
	error = ext2fs_direnter(ip, dvp, cnp);
	if (error != 0) {
		dp->i_e2fs_nlink--;
		dp->i_flag |= IN_CHANGE;
	}
bad:
	/*
	 * No need to do an explicit VOP_TRUNCATE here, vrele will do this
	 * for us because we set the link count to 0.
	 */
	if (error) {
		ip->i_e2fs_nlink = 0;
		ip->i_flag |= IN_CHANGE;
		vput(tvp);
	} else
		*ap->a_vpp = tvp;
out:
	pool_put(&namei_pool, cnp->cn_pnbuf);
	vput(dvp);
	return (error);
}