1 | /* |
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2 | * IMFS Node Removal Handler |
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3 | * |
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4 | * This file contains the handler used to remove a node when a file type |
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5 | * does not require special actions. |
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6 | * |
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7 | * COPYRIGHT (c) 1989-1999. |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * |
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10 | * Modifications to support reference counting in the file system are |
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11 | * Copyright (c) 2012 embedded brains GmbH. |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.com/license/LICENSE. |
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16 | * |
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17 | * $Id$ |
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18 | */ |
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19 | |
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20 | #if HAVE_CONFIG_H |
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21 | #include "config.h" |
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22 | #endif |
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23 | |
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24 | #include "imfs.h" |
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25 | |
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26 | #include <stdlib.h> |
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27 | |
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28 | void IMFS_create_orphan( IMFS_jnode_t *jnode ) |
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29 | { |
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30 | if ( jnode->Parent != NULL ) { |
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31 | IMFS_remove_from_directory( jnode ); |
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32 | } |
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33 | |
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34 | --jnode->st_nlink; |
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35 | |
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36 | IMFS_update_ctime( jnode ); |
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37 | } |
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38 | |
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39 | void IMFS_check_node_remove( IMFS_jnode_t *jnode ) |
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40 | { |
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41 | if ( jnode->st_nlink < 1 ) { |
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42 | switch ( jnode->type ) { |
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43 | case IMFS_MEMORY_FILE: |
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44 | IMFS_memfile_remove( jnode ); |
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45 | break; |
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46 | case IMFS_SYM_LINK: |
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47 | free( jnode->info.sym_link.name ); |
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48 | break; |
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49 | default: |
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50 | break; |
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51 | } |
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52 | |
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53 | free( jnode ); |
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54 | } |
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55 | } |
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56 | |
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57 | static int IMFS_rmnod_directory( |
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58 | const rtems_filesystem_location_info_t *parentloc, |
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59 | const rtems_filesystem_location_info_t *loc |
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60 | ) |
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61 | { |
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62 | IMFS_jnode_t *node = loc->node_access; |
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63 | int rv = 0; |
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64 | |
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65 | if ( !rtems_chain_is_empty( &node->info.directory.Entries ) ) { |
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66 | errno = ENOTEMPTY; |
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67 | rv = -1; |
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68 | } else if ( |
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69 | rtems_filesystem_location_is_root( loc ) |
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70 | || node->info.directory.mt_fs != NULL |
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71 | ) { |
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72 | errno = EBUSY; |
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73 | rv = -1; |
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74 | } |
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75 | |
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76 | return rv; |
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77 | } |
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78 | |
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79 | static int IMFS_rmnod_hard_link( |
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80 | const rtems_filesystem_location_info_t *parentloc, |
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81 | const rtems_filesystem_location_info_t *loc |
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82 | ) |
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83 | { |
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84 | int rv = 0; |
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85 | IMFS_jnode_t *node = loc->node_access; |
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86 | IMFS_jnode_t *target = node->info.hard_link.link_node; |
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87 | |
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88 | if ( target->st_nlink == 1) { |
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89 | rtems_filesystem_location_info_t target_loc = *loc; |
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90 | |
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91 | target_loc.node_access = target; |
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92 | IMFS_Set_handlers( &target_loc ); |
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93 | |
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94 | rv = (*target_loc.ops->rmnod_h)( parentloc, &target_loc ); |
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95 | } else { |
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96 | --target->st_nlink; |
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97 | IMFS_update_ctime( target ); |
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98 | } |
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99 | |
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100 | return rv; |
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101 | } |
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102 | |
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103 | int IMFS_rmnod( |
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104 | const rtems_filesystem_location_info_t *parentloc, |
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105 | const rtems_filesystem_location_info_t *loc |
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106 | ) |
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107 | { |
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108 | int rv = 0; |
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109 | IMFS_jnode_t *node = loc->node_access; |
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110 | |
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111 | switch ( node->type ) { |
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112 | case IMFS_DIRECTORY: |
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113 | rv = IMFS_rmnod_directory( parentloc, loc ); |
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114 | break; |
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115 | case IMFS_HARD_LINK: |
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116 | rv = IMFS_rmnod_hard_link( parentloc, loc ); |
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117 | break; |
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118 | default: |
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119 | break; |
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120 | } |
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121 | |
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122 | if ( rv == 0 ) { |
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123 | IMFS_create_orphan( node ); |
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124 | IMFS_check_node_remove( node ); |
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125 | } |
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126 | |
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127 | return rv; |
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128 | } |
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