/* libdiskfs implementation of fs.defs: dir_unlink Copyright (C) 1992,93,94,95,96,97,2002 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "priv.h" #include "fs_S.h" #include /* Implement dir_unlink as described in . */ kern_return_t diskfs_S_dir_unlink (struct protid *dircred, char *name) { struct node *dnp; struct node *np; struct dirstat *ds = alloca (diskfs_dirstat_size); error_t error; mach_port_t control = MACH_PORT_NULL; if (!dircred) return EOPNOTSUPP; dnp = dircred->po->np; if (diskfs_check_readonly ()) return EROFS; mutex_lock (&dnp->lock); error = diskfs_lookup (dnp, name, REMOVE, &np, ds, dircred); if (error == EAGAIN) error = EPERM; /* 1003.1-1996 5.5.1.4 */ if (error) { diskfs_drop_dirstat (dnp, ds); mutex_unlock (&dnp->lock); return error; } /* This isn't the BSD behavior, but it is Posix compliant and saves us on several race conditions.*/ if (S_ISDIR(np->dn_stat.st_mode)) { if (np == dnp) /* gotta catch '.' */ diskfs_nrele (np); else diskfs_nput (np); diskfs_drop_dirstat (dnp, ds); mutex_unlock (&dnp->lock); return EPERM; /* 1003.1-1996 5.5.1.4 */ } error = diskfs_dirremove (dnp, np, name, ds); if (diskfs_synchronous) diskfs_node_update (dnp, 1); if (error) { diskfs_nput (np); mutex_unlock (&dnp->lock); return error; } np->dn_stat.st_nlink--; np->dn_set_ctime = 1; if (diskfs_synchronous) diskfs_node_update (np, 1); if (np->dn_stat.st_nlink == 0) fshelp_fetch_control (&np->transbox, &control); /* This check is necessary because we might get here on an error while checking the mode on something which happens to be `.'. */ if (np == dnp) diskfs_nrele (np); else diskfs_nput (np); mutex_unlock (&dnp->lock); if (control) { fsys_goaway (control, FSYS_GOAWAY_UNLINK); mach_port_deallocate (mach_task_self (), control); } return error; }