diff options
Diffstat (limited to 'libnetfs')
| -rw-r--r-- | libnetfs/dir-lookup.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/libnetfs/dir-lookup.c b/libnetfs/dir-lookup.c new file mode 100644 index 00000000..ddd08e1c --- /dev/null +++ b/libnetfs/dir-lookup.c @@ -0,0 +1,143 @@ +/* + Copyright (C) 1995 Free Software Foundation, Inc. + Written by Michael I. Bushnell, p/BSG. + + This file is part of the GNU Hurd. + + The GNU Hurd 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. + + The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include <fcntl.h> +#include "netfs.h" +#include "fs_S.h" + + +error_t +netfs_S_dir_lookup (struct protid *diruser, + char *filename, + int flags, + mode_t mode, + retry_type *do_retry, + char *retry_name, + mach_port_t *retry_port, + mach_msg_type_name_t *retry_port_type) +{ + int create; /* true if O_CREAT flag set */ + int excl; /* true if O_EXCL flag set */ + int mustbedir; /* true if the result must be S_IFDIR */ + int lastcomp; /* true if we are at the last component */ + int newnode; /* true if this node is newly created */ + struct node *dnp, *np; + char *nextname; + + if (!diruser) + return EOPNOTSUPP; + + create = (flags & O_CREAT); + excl = (flags & O_EXCL); + + /* Skip leading slashes */ + while (*filename == '/') + filename++; + + *retry_poly = MACH_MSG_TYPE_MAKE_SEND; + *retry = FS_RETRY_NORMAL; + *retry_name = '\0'; + + if (*filename == '\0') + { + mustbedir = 1; + + /* Set things up in the state expected by the code from gotit: on. */ + dnp = 0; + np = diruser->po->np; + mutex_lock (&np->lock); + netfs_nref (np); + goto gotit; + } + + dnp = diruser->po->np; + mutex_lock (&dnp->lock); + np = 0; + + netfs_nref (dnp); /* acquire a reference for later netfs_nput */ + + do + { + assert (!lastcomp); + + /* Find the name of the next pathname component */ + nextname = index (filename, '/'); + + if (nextname) + { + *nextname++ = '\0'; + while (*nextname == '/') + nextname++; + if (*nextname == '\0') + { + /* These are the rules for filenames ending in /. */ + nextname = 0; + lastcomp = 1; + mustbedir = 1; + create = 0; + } + else + lastcomp = 1; + + np = 0; + + /* Attempt a lookup on the next pathname component. */ + error = netfs_attempt_lookup (user, dnp, nextname, &np); + + /* Implement O_EXCL flag here */ + if (lastcomp && create && excl && (!error || error == EAGAIN)) + error = EEXIST; + + /* If we get an error, we're done */ + if (error == EAGAIN) + { + /* This really means .. from root */ + if (diruser->po->dotdotport != MACH_PORT_NULL) + { + *retry = FS_RETRY_REAUTH; + *retry_port = dircred->po->dotdotport; + *retry_port_type = MACH_MSG_TYPE_COPY_SEND; + if (!lastcomp) + strcpy (retry_name, nextname); + error = 0; + goto out; + } + else + { + /* We are the global root; .. from our root is + just our root again. */ + error = 0; + np = dnp; + netfs_nref (np); + } + } + + /* Create the new node if necessary */ + if (lastcomp && create) + { + if (error == ENOENT) + { + mode &= ~(S_IFMT | S_ISPARE | S_ISVTX); + mode |= S_IFREG; + error = netfs_attempt_create_file (diruser, dnp, + filename, mode, &np); + newnode = 1; + } + |