diff options
Diffstat (limited to 'node.c')
| -rw-r--r-- | node.c | 195 |
1 files changed, 0 insertions, 195 deletions
@@ -1,195 +0,0 @@ -/* procfs -- a translator for providing GNU/Linux compatible - proc pseudo-filesystem - - node.c -- This file contains function defintions to handle - node creation and destruction. - - Copyright (C) 2008, FSF. - Written as a Summer of Code Project - - procfs 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. - - procfs 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 <stdio.h> -#include <stdlib.h> -#include <fcntl.h> -#include <string.h> -#include <errno.h> -#include <hurd/ihash.h> -#include <hurd/fshelp.h> -#include <hurd/iohelp.h> - -#include <hurd/netfs.h> - -#include "procfs.h" - -/* Return a new node in NODE, with a name NAME, and return the - new node with a single reference in NODE. */ -error_t procfs_create_node (struct procfs_dir_entry *dir_entry, - const char *fs_path, struct node **node) -{ - struct node *new; - struct netnode *nn = malloc (sizeof (struct netnode)); - error_t err; - - if (! nn) - return ENOMEM; - if (! fs_path) - fs_path = strdup (""); - nn->fs = dir_entry->dir->fs; - nn->dir_entry = dir_entry; - nn->dir = NULL; - nn->fs_path = strdup (fs_path); - - new = netfs_make_node (nn); - if (! new) - { - free (nn); - return ENOMEM; - } - - fshelp_touch (&new->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME, - procfs_maptime); - - spin_lock (&nn->fs->inode_mappings_lock); - err = hurd_ihash_add (&nn->fs->inode_mappings, dir_entry->stat.st_ino, dir_entry); - spin_unlock (&nn->fs->inode_mappings_lock); - - if (err) - { - free (nn); - free (new); - return err; - } - - dir_entry->node = new; - *node = new; - - return 0; -} - -/* Update the directory entry for NAME to reflect ST and SYMLINK_TARGET. - True is returned if successful, or false if there was a memory allocation - error. TIMESTAMP is used to record the time of this update. */ -static void -update_entry (struct procfs_dir_entry *dir_entry, const struct stat *st, - const char *symlink_target, time_t timestamp) -{ - ino_t ino; - struct procfs *fs = dir_entry->dir->fs; - - if (dir_entry->stat.st_ino) - ino = dir_entry->stat.st_ino; - else - ino = fs->next_inode++; - - dir_entry->name_timestamp = timestamp; - - if (st) - /* The ST and SYMLINK_TARGET parameters are only valid if ST isn't 0. */ - { - dir_entry->stat = *st; - dir_entry->stat_timestamp = timestamp; - - if (!dir_entry->symlink_target || !symlink_target - || strcmp (dir_entry->symlink_target, symlink_target) != 0) - { - if (dir_entry->symlink_target) - free (dir_entry->symlink_target); - dir_entry->symlink_target = symlink_target ? strdup (symlink_target) : 0; - } - } - - /* The st_ino field is always valid. */ - dir_entry->stat.st_ino = ino; - dir_entry->stat.st_fsid = fs->fsid; - dir_entry->stat.st_fstype = PROCFILESYSTEM; -} - -/* Refresh stat information for NODE */ -error_t procfs_refresh_node (struct node *node) -{ - struct netnode *nn = node->nn; - struct procfs_dir_entry *dir_entry = nn->dir_entry; - - if (! dir_entry) - /* This is a deleted node, don't attempt to do anything. */ - return 0; - else - { - error_t err = 0; - - struct timeval tv; - maptime_read (procfs_maptime, &tv); - - time_t timestamp = tv.tv_sec; - - struct procfs_dir *dir = dir_entry->dir; - - mutex_lock (&dir->node->lock); - - if (! dir_entry->self_p) - /* This is a deleted entry, just awaiting disposal; do so. */ - { -#if 0 - nn->dir_entry = 0; - free_entry (dir_entry); - return 0; -#endif - } - - else if (dir_entry->noent) - err = ENOENT; - else - { - if (*(dir_entry->name)) - { - err = procfs_dir_refresh (dir_entry->dir, - dir_entry->dir->node == dir_entry->dir->fs->root); - if (!err && dir_entry->noent) - err = ENOENT; - - if (err == ENOENT) - { - dir_entry->noent = 1; /* A negative entry. */ - dir_entry->name_timestamp = timestamp; - } - } - else - { - /* Refresh the root node with the old stat - information. */ - update_entry (dir_entry, &netfs_root_node->nn_stat, NULL, timestamp); - } - } - - node->nn_stat = dir_entry->stat; - node->nn_translated = S_ISLNK (dir_entry->stat.st_mode) ? S_IFLNK : 0; - if (!nn->dir && S_ISDIR (dir_entry->stat.st_mode)) - procfs_dir_create (nn->fs, node, nn->fs_path, &nn->dir); - - mutex_unlock (&dir->node->lock); - - return err; - } -} - -/* Remove NODE from its entry */ -error_t procfs_remove_node (struct node *node) -{ - - /* STUB */ - - return 0; -} |