1 | /* |
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2 | * Link Operations Table for the IMFS |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | */ |
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11 | |
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12 | #if HAVE_CONFIG_H |
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13 | #include "config.h" |
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14 | #endif |
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15 | |
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16 | #include "imfs.h" |
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17 | |
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18 | #include <stdlib.h> |
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19 | #include <string.h> |
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20 | |
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21 | static int IMFS_stat_link( |
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22 | const rtems_filesystem_location_info_t *loc, |
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23 | struct stat *buf |
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24 | ) |
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25 | { |
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26 | const IMFS_jnode_t *node = loc->node_access; |
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27 | |
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28 | if ( IMFS_type( node ) != IMFS_HARD_LINK ) { |
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29 | buf->st_size = strlen( node->info.sym_link.name ); |
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30 | |
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31 | return IMFS_stat( loc, buf ); |
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32 | } else { |
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33 | rtems_filesystem_location_info_t targetloc = *loc; |
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34 | |
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35 | targetloc.node_access = node->info.hard_link.link_node; |
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36 | IMFS_Set_handlers( &targetloc ); |
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37 | |
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38 | return (targetloc.handlers->fstat_h)( &targetloc, buf ); |
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39 | } |
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40 | } |
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41 | |
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42 | static const rtems_filesystem_file_handlers_r IMFS_link_handlers = { |
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43 | rtems_filesystem_default_open, |
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44 | rtems_filesystem_default_close, |
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45 | rtems_filesystem_default_read, |
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46 | rtems_filesystem_default_write, |
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47 | rtems_filesystem_default_ioctl, |
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48 | rtems_filesystem_default_lseek, |
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49 | IMFS_stat_link, |
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50 | rtems_filesystem_default_ftruncate, |
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51 | rtems_filesystem_default_fsync_or_fdatasync, |
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52 | rtems_filesystem_default_fsync_or_fdatasync, |
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53 | rtems_filesystem_default_fcntl |
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54 | }; |
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55 | |
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56 | static IMFS_jnode_t *IMFS_node_initialize_hard_link( |
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57 | IMFS_jnode_t *node, |
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58 | const IMFS_types_union *info |
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59 | ) |
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60 | { |
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61 | node->info.hard_link.link_node = info->hard_link.link_node; |
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62 | |
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63 | return node; |
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64 | } |
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65 | |
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66 | static IMFS_jnode_t *IMFS_node_remove_hard_link( |
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67 | IMFS_jnode_t *node |
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68 | ) |
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69 | { |
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70 | IMFS_jnode_t *target = node->info.hard_link.link_node; |
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71 | |
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72 | if ( target->st_nlink == 1) { |
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73 | target = (*target->control->node_remove)( target ); |
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74 | if ( target == NULL ) { |
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75 | node = NULL; |
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76 | } |
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77 | } else { |
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78 | --target->st_nlink; |
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79 | IMFS_update_ctime( target ); |
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80 | } |
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81 | |
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82 | return node; |
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83 | } |
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84 | |
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85 | const IMFS_node_control IMFS_node_control_hard_link = { |
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86 | .imfs_type = IMFS_HARD_LINK, |
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87 | .handlers = &IMFS_link_handlers, |
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88 | .node_initialize = IMFS_node_initialize_hard_link, |
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89 | .node_remove = IMFS_node_remove_hard_link, |
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90 | .node_destroy = IMFS_node_destroy_default |
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91 | }; |
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92 | |
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93 | static IMFS_jnode_t *IMFS_node_initialize_sym_link( |
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94 | IMFS_jnode_t *node, |
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95 | const IMFS_types_union *info |
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96 | ) |
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97 | { |
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98 | node->info.sym_link.name = info->sym_link.name; |
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99 | |
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100 | return node; |
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101 | } |
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102 | |
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103 | static IMFS_jnode_t *IMFS_node_destroy_sym_link( IMFS_jnode_t *node ) |
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104 | { |
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105 | free( node->info.sym_link.name ); |
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106 | |
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107 | return node; |
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108 | } |
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109 | |
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110 | const IMFS_node_control IMFS_node_control_sym_link = { |
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111 | .imfs_type = IMFS_SYM_LINK, |
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112 | .handlers = &IMFS_link_handlers, |
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113 | .node_initialize = IMFS_node_initialize_sym_link, |
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114 | .node_remove = IMFS_node_remove_default, |
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115 | .node_destroy = IMFS_node_destroy_sym_link |
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116 | }; |
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