- if ((ip->i_mode&IFMT) == IFDIR) {
- register struct direct *d = &fndp->ni_dent;
-
- /*
- * Avoid ".", "..", and aliases of "." for obvious reasons.
- */
- if ((d->d_namlen == 1 && d->d_name[0] == '.') || dp == ip ||
- fndp->ni_isdotdot || (ip->i_flag & IRENAME)) {
- IUNLOCK(ip);
- ufs_abortop(fndp);
- ufs_abortop(tndp);
- return (EINVAL);
- }
- ip->i_flag |= IRENAME;
- oldparent = dp->i_number;
- doingdirectory++;
- }
- vrele(fndp->ni_dvp);
-
- /*
- * 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_nlink++;
- ip->i_flag |= ICHG;
- error = iupdat(ip, &time, &time, 1);
- IUNLOCK(ip);
-
- /*
- * When the target exists, both the directory
- * and target vnodes are returned locked.
- */
- dp = VTOI(tndp->ni_dvp);
- xp = NULL;
- if (tndp->ni_vp)
- xp = VTOI(tndp->ni_vp);
- /*
- * If ".." must be changed (ie the directory gets a new
- * parent) then the source directory must not be in the
- * directory heirarchy 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().
- */
- if (oldparent != dp->i_number)
- newparent = dp->i_number;
- if (doingdirectory && newparent) {
- if (error = iaccess(ip, IWRITE, tndp->ni_cred))
- goto bad;
- tndp->ni_nameiop = RENAME | LOCKPARENT | LOCKLEAF | NOCACHE;
- do {
- dp = VTOI(tndp->ni_dvp);
- if (xp != NULL)
- iput(xp);
- if (error = checkpath(ip, dp, tndp->ni_cred))
- goto out;
- if (error = namei(tndp))
- goto out;
- xp = NULL;
- if (tndp->ni_vp)
- xp = VTOI(tndp->ni_vp);
- } while (dp != VTOI(tndp->ni_dvp));
- }
- /*
- * 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) {
- dp->i_nlink++;
- dp->i_flag |= ICHG;
- error = iupdat(dp, &time, &time, 1);
- }
- if (error = direnter(ip, tndp))
- goto out;
- } 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_mode & ISVTX) && tndp->ni_cred->cr_uid != 0 &&
- tndp->ni_cred->cr_uid != dp->i_uid &&
- xp->i_uid != tndp->ni_cred->cr_uid) {
- error = EPERM;
- goto bad;
- }
- /*
- * Target must be empty if a directory
- * and have no links to it.
- * Also, insure source and target are
- * compatible (both directories, or both
- * not directories).
- */
- if ((xp->i_mode&IFMT) == IFDIR) {
- if (!dirempty(xp, dp->i_number, tndp->ni_cred) ||
- xp->i_nlink > 2) {
- error = ENOTEMPTY;
- goto bad;
- }
- if (!doingdirectory) {
- error = ENOTDIR;
- goto bad;
- }
- cache_purge(ITOV(dp));
- } else if (doingdirectory) {
- error = EISDIR;
- goto bad;
- }
- if (error = dirrewrite(dp, ip, tndp))
- goto bad;
- vput(ITOV(dp));
- /*
- * 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_nlink--;
- if (doingdirectory) {
- if (--xp->i_nlink != 0)
- panic("rename: linked directory");
- error = itrunc(xp, (u_long)0);
- }
- xp->i_flag |= ICHG;
- vput(ITOV(xp));
- xp = NULL;
- }
-
- /*
- * 3) Unlink the source.
- */
- fndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
- (void)namei(fndp);
- if (fndp->ni_vp != NULL) {
- xp = VTOI(fndp->ni_vp);
- dp = VTOI(fndp->ni_dvp);
- } else {
- if (fndp->ni_dvp != NULL)
- vput(fndp->ni_dvp);
- xp = NULL;
- dp = NULL;
- }
- /*
- * 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("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_nlink--;
- dp->i_flag |= ICHG;
- error = rdwri(UIO_READ, xp, (caddr_t)&dirbuf,
- sizeof (struct dirtemplate), (off_t)0,
- UIO_SYSSPACE, tndp->ni_cred, (int *)0);
- if (error == 0) {
- if (dirbuf.dotdot_namlen != 2 ||
- dirbuf.dotdot_name[0] != '.' ||
- dirbuf.dotdot_name[1] != '.') {
- printf("rename: mangled dir\n");
- } else {
- dirbuf.dotdot_ino = newparent;
- (void) rdwri(UIO_WRITE, xp,
- (caddr_t)&dirbuf,
- sizeof (struct dirtemplate),
- (off_t)0, UIO_SYSSPACE,
- tndp->ni_cred, (int *)0);
- cache_purge(ITOV(dp));
- }
- }
- }
- error = dirremove(fndp);
- if (!error) {
- xp->i_nlink--;
- xp->i_flag |= ICHG;
- }
- xp->i_flag &= ~IRENAME;
- }
- if (dp)
- vput(ITOV(dp));
- if (xp)
- vput(ITOV(xp));
- vrele(ITOV(ip));
- return (error);
-
-bad:
- if (xp)
- vput(ITOV(xp));
- vput(ITOV(dp));
-out:
- ip->i_nlink--;
- ip->i_flag |= ICHG;
- vrele(ITOV(ip));
- return (error);
-}
-
-/*
- * A virgin directory (no blushing please).
- */
-struct dirtemplate mastertemplate = {
- 0, 12, 1, ".",
- 0, DIRBLKSIZ - 12, 2, ".."
-};
-
-/*
- * Mkdir system call
- */
-ufs_mkdir(ndp, vap)
- struct nameidata *ndp;
- struct vattr *vap;
-{
- register struct inode *ip, *dp;
- struct inode *tip;
- struct vnode *dvp;
- struct dirtemplate dirtemplate;
- int error;
- int dmode;
-
- dvp = ndp->ni_dvp;
- dp = VTOI(dvp);
- dmode = vap->va_mode&0777;
- dmode |= IFDIR;
- /*
- * Must simulate part of maknode here
- * in order to acquire the inode, but
- * not have it entered in the parent
- * directory. The entry is made later
- * after writing "." and ".." entries out.
- */
- error = ialloc(dp, dirpref(dp->i_fs), dmode, &tip);
- if (error) {
- iput(dp);
- return (error);
- }
- ip = tip;
projects / unix-history / blobdiff