diff options
Diffstat (limited to 'node.c')
| -rw-r--r-- | node.c | 244 |
1 files changed, 117 insertions, 127 deletions
@@ -1,10 +1,10 @@ -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ /*node.c*/ -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ /*Implementation of node management strategies*/ -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ /*Based on the code of unionfs translator.*/ -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ /*Copyright (C) 2001, 2002, 2005, 2008 Free Software Foundation, Inc. Written by Sergiu Ivanov <unlimitedscolobb@gmail.com>. @@ -22,145 +22,135 @@ along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.*/ -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ #define _GNU_SOURCE 1 -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ #include <stdlib.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/mman.h> #include <stdio.h> -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ #include "debug.h" #include "node.h" #include "filter.h" -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ -/*----------------------------------------------------------------------------*/ -/*--------Global Variables----------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ +/*--------Global Variables---------------------------------------------------*/ /*The lock protecting the underlying filesystem*/ struct mutex ulfs_lock = MUTEX_INITIALIZER; -/*----------------------------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ -/*----------------------------------------------------------------------------*/ -/*--------Functions-----------------------------------------------------------*/ +/*---------------------------------------------------------------------------*/ +/*--------Functions----------------------------------------------------------*/ /*Derives a new node from `lnode` and adds a reference to `lnode`*/ -error_t -node_create - ( - node_t ** node /*store the result here*/ - ) +error_t node_create (node_t ** node) +{ + error_t err = 0; + + /*Create a new netnode */ + netnode_t *netnode_new = malloc (sizeof (netnode_t)); + + /*If the memory could not be allocated */ + if (netnode_new == NULL) + err = ENOMEM; + else + { + /*create a new node from the netnode */ + node_t *node_new = netfs_make_node (netnode_new); + + /*If the creation failed */ + if (node_new == NULL) { - error_t err = 0; - - /*Create a new netnode*/ - netnode_t * netnode_new = malloc(sizeof(netnode_t)); - - /*If the memory could not be allocated*/ - if(netnode_new == NULL) - err = ENOMEM; - else - { - /*create a new node from the netnode*/ - node_t * node_new = netfs_make_node(netnode_new); - - /*If the creation failed*/ - if(node_new == NULL) - { - /*set the error code*/ - err = ENOMEM; - - /*destroy the netnode created above*/ - free(netnode_new); - - /*stop*/ - return err; - } - - /*store the result of creation in the second parameter*/ - *node = node_new; - } - - /*Return the result of operations*/ - return err; - }/*node_create*/ -/*----------------------------------------------------------------------------*/ + /*set the error code */ + err = ENOMEM; + + /*destroy the netnode created above */ + free (netnode_new); + + /*stop */ + return err; + } + + /*store the result of creation in the second parameter */ + *node = node_new; + } + + /*Return the result of operations */ + return err; +} /*node_create */ + +/*---------------------------------------------------------------------------*/ /*Destroys the specified node and removes a light reference from the - associated light node*/ -void -node_destroy - ( - node_t * np - ) - { - /*Destroy the port to the underlying filesystem allocated to the node*/ - PORT_DEALLOC(np->nn->port); - - /*Free the netnode and the node itself*/ - free(np->nn); - free(np); - }/*node_destroy*/ -/*----------------------------------------------------------------------------*/ + associated light node*/ +void node_destroy (node_t * np) +{ + /*Destroy the port to the underlying filesystem allocated to the node */ + PORT_DEALLOC (np->nn->port); + + /*Free the netnode and the node itself */ + free (np->nn); + free (np); +} /*node_destroy */ + +/*---------------------------------------------------------------------------*/ /*Creates the root node and the corresponding lnode*/ -error_t -node_create_root - ( - node_t ** root_node /*store the result here*/ - ) - { - error_t err; - - /*Try to create a node*/ - node_t * node; - err = node_create(&node); - if(err) - return err; - - /*Store the result in the parameter*/ - *root_node = node; - - /*Return the result*/ - return err; - }/*node_create_root*/ -/*----------------------------------------------------------------------------*/ +error_t node_create_root (node_t ** root_node) +{ + error_t err; + + /*Try to create a node */ + node_t *node; + err = node_create (&node); + if (err) + return err; + + /*Store the result in the parameter */ + *root_node = node; + + /*Return the result */ + return err; +} /*node_create_root */ + +/*---------------------------------------------------------------------------*/ /*Initializes the port to the underlying filesystem for the root node*/ -error_t -node_init_root - ( - mach_port_t underlying, /*the port to the underlying node*/ - node_t * node /*the root node*/ - ) - { - error_t err = 0; - - /*Acquire a lock for operations on the underlying filesystem*/ - mutex_lock(&ulfs_lock); - - /*Store the specified port in the node*/ - node->nn->port = underlying; - - LOG_MSG("node_init_root: Port: 0x%ld", (unsigned long)node->nn->port); - - /*Stat the root node*/ - err = io_stat(node->nn->port, &node->nn_stat); - if(err) - { - /*deallocate the port*/ - PORT_DEALLOC(node->nn->port); - - LOG_MSG("node_init_root: Could not stat the root node."); - - /*unlock the mutex and exit*/ - mutex_unlock(&ulfs_lock); - return err; - } - - /*Release the lock for operations on the undelying filesystem*/ - mutex_unlock(&ulfs_lock); - - /*Return the result of operations*/ - return err; - }/*node_init_root*/ -/*----------------------------------------------------------------------------*/ +error_t node_init_root (mach_port_t underlying, /*the port to the + underlying node */ + node_t * node /*the root node */ + ) +{ + error_t err = 0; + + /*Acquire a lock for operations on the underlying filesystem */ + mutex_lock (&ulfs_lock); + + /*Store the specified port in the node */ + node->nn->port = underlying; + + LOG_MSG ("node_init_root: Port: 0x%ld", (unsigned long) node->nn->port); + + /*Stat the root node */ + err = io_stat (node->nn->port, &node->nn_stat); + if (err) + { + /*deallocate the port */ + PORT_DEALLOC (node->nn->port); + + LOG_MSG ("node_init_root: Could not stat the root node."); + + /*unlock the mutex and exit */ + mutex_unlock (&ulfs_lock); + return err; + } + + /*Release the lock for operations on the undelying filesystem */ + mutex_unlock (&ulfs_lock); + + /*Return the result of operations */ + return err; +} /*node_init_root */ + +/*---------------------------------------------------------------------------*/ |