diff options
Diffstat (limited to 'libdiskfs/file-inv-trans.c')
| -rw-r--r-- | libdiskfs/file-inv-trans.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/libdiskfs/file-inv-trans.c b/libdiskfs/file-inv-trans.c new file mode 100644 index 00000000..d3014164 --- /dev/null +++ b/libdiskfs/file-inv-trans.c @@ -0,0 +1,160 @@ +/* + Copyright (C) 1994, 1995, 1996 Free Software Foundation + + 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 <fcntl.h> + +/* Implement fs.defs:file_invoke_translator as described in <hurd/fs.defs>. */ +kern_return_t +diskfs_S_file_invoke_translator (struct protid *cred __attribute__ ((unused)), + int flags __attribute__ ((unused)), + retry_type *retry __attribute__ ((unused)), + char *retry_name __attribute__ ((unused)), + mach_port_t *retrypt __attribute__ ((unused)), + mach_msg_type_name_t *retrypttype + __attribute__ ((unused))) +{ +#if 0 + /* XXX */ + static mach_port_t _diskfs_dotdot_file = MACH_PORT_NULL; + error_t error = 0; + mode_t type; + struct node *np; + struct protid *newpi; + + /* This code is very similar (but subtly different) from + dir-pathtrans.c and fsys-getroot.c. A way should be found to + combine them. */ + + if (!cred) + return EOPNOTSUPP; + + flags &= O_HURD; + + np = cred->po->np; + + mutex_lock (&np->lock); + + type = np->dn_stat.st_mode & S_IFMT; + + repeat_transcheck: + /* Ignore O_NOTRANS in the following check */ + if ((np->dn_stat.st_mode & S_IPTRANS) + || np->translator.control != MACH_PORT_NULL) + { + mach_port_t control = np->translator.control; + + if (control == MACH_PORT_NULL) + { + /* This use of _diskfs_dotdot_file is completely and utterly + bogus. XXX */ + if (error = diskfs_start_translator (np, _diskfs_dotdot_file)) + { + mutex_unlock (&np->lock); + return error; + } + control = np->translator.control; + } + + mach_port_mod_refs (mach_task_self (), control, MACH_PORT_RIGHT_SEND, 1); + mutex_unlock (&np->lock); + error = fsys_getroot (control, + cred->user->uids->ids, cred->user->uids->num, + cred->user->gids->ids, cred->user->gids->num, + flags, retry, retry_name, retrypt); + if (error == MACH_SEND_INVALID_DEST) + { + mutex_lock (&np->lock); + if (np->translator.control == control) + fshelp_translator_drop (&np->translator); + mach_port_deallocate (mach_task_self (), control); + error = 0; + goto repeat_transcheck; + } + + if (!error && *retrypt != MACH_PORT_NULL) + *retrypttype = MACH_MSG_TYPE_MOVE_SEND; + else + *retrypttype = MACH_MSG_TYPE_COPY_SEND; + + return error; + } + + /* Ignore O_NOTRANS here. */ + if (type == S_IFLNK && !(flags & O_NOLINK)) + { + /* Handle symlink interpretation */ + char pathbuf[np->dn_stat.st_size + 1]; + int amt; + + if (diskfs_read_symlink_hook) + error = (*diskfs_read_symlink_hook) (np, pathbuf); + if (!diskfs_read_symlink_hook || error == EINVAL) + error = diskfs_node_rdwr (np, pathbuf, 0, np->dn_stat.st_size, 0, + 0, &amt); + pathbuf[amt] = '\0'; + + mutex_unlock (&np->lock); + if (error) + return error; + + if (pathbuf[0] == '/') + { + *retry = FS_RETRY_MAGICAL; + *retrypt = MACH_PORT_NULL; + *retrypttype = MACH_MSG_TYPE_COPY_SEND; + strcpy (retry_name, pathbuf); + return 0; + } + else + { + *retry = FS_RETRY_REAUTH; + *retrypt = _diskfs_dotdot_file; + *retrypttype = MACH_MSG_TYPE_COPY_SEND; + strcpy (retry_name, pathbuf); + return 0; + } + } + + if ((type == S_IFSOCK || type == S_IFBLK + || type == S_IFCHR || type == S_IFIFO) + && (flags & (O_READ|O_WRITE|O_EXEC))) + error = EOPNOTSUPP; + + + flags &= ~OPENONLY_STATE_MODES; + + error = diskfs_create_protid (diskfs_make_peropen (np, flags, + _diskfs_dotdot_file), + cred->user, &newpi); + if (! error) + { + *retry = FS_RETRY_NONE; + retry_name[0] = '\0'; + *retrypt = ports_get_right (newpi); + *retrypttype = MACH_MSG_TYPE_MAKE_SEND; + ports_port_deref (newpi); + } + + mutex_unlock (&np->lock); + + return error; +#else + return EOPNOTSUPP; +#endif +} |