source:
rtems/cpukit/libfs/src/imfs/imfs_fsunmount.c
@
c058578
Last change on this file since c058578 was c058578, checked in by Joel Sherrill <joel.sherrill@…>, on 11/01/00 at 21:02:46 | |
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1 | /* |
2 | * IMFS Initialization |
3 | * |
4 | * COPYRIGHT (c) 1989-1999. |
5 | * On-Line Applications Research Corporation (OAR). |
6 | * |
7 | * The license and distribution terms for this file may be |
8 | * found in the file LICENSE in this distribution or at |
9 | * http://www.OARcorp.com/rtems/license.html. |
10 | * |
11 | * $Id$ |
12 | */ |
13 | |
14 | #include <sys/types.h> /* for mkdir */ |
15 | #include <fcntl.h> |
16 | #include <unistd.h> |
17 | #include <stdlib.h> |
18 | |
19 | #include <assert.h> |
20 | |
21 | #include "imfs.h" |
22 | #include <rtems/libio_.h> |
23 | |
24 | #if defined(IMFS_DEBUG) |
25 | #include <stdio.h> |
26 | #endif |
27 | |
28 | /* |
29 | * IMFS_fsunmount |
30 | */ |
31 | |
32 | #define jnode_get_control( jnode ) \ |
33 | (&jnode->info.directory.Entries) |
34 | |
35 | #define jnode_has_no_children( jnode ) \ |
36 | Chain_Is_empty( jnode_get_control( jnode ) ) |
37 | |
38 | #define jnode_has_children( jnode ) \ |
39 | ( ! jnode_has_no_children( jnode ) ) |
40 | |
41 | #define jnode_get_first_child( jnode ) \ |
42 | ((IMFS_jnode_t *)( Chain_Head( jnode_get_control( jnode ) )->next)) |
43 | |
44 | int IMFS_fsunmount( |
45 | rtems_filesystem_mount_table_entry_t *temp_mt_entry |
46 | ) |
47 | { |
48 | IMFS_jnode_t *jnode; |
49 | IMFS_jnode_t *next; |
50 | rtems_filesystem_location_info_t loc; |
51 | int result = 0; |
52 | |
53 | /* |
54 | * Traverse tree that starts at the mt_fs_root and deallocate memory |
55 | * associated memory space |
56 | */ |
57 | |
58 | jnode = (IMFS_jnode_t *)temp_mt_entry->mt_fs_root.node_access; |
59 | loc = temp_mt_entry->mt_fs_root; |
60 | |
61 | /* |
62 | * Set this to null to indicate that it is being unmounted. |
63 | */ |
64 | |
65 | temp_mt_entry->mt_fs_root.node_access = NULL; |
66 | |
67 | do { |
68 | next = jnode->Parent; |
69 | loc.node_access = (void *)jnode; |
70 | IMFS_Set_handlers( &loc ); |
71 | |
72 | if ( jnode->type != IMFS_DIRECTORY ) { |
73 | result = IMFS_unlink( &loc ); |
74 | if (result != 0) |
75 | return -1; |
76 | jnode = next; |
77 | } else if ( jnode_has_no_children( jnode ) ) { |
78 | result = IMFS_unlink( &loc ); |
79 | if (result != 0) |
80 | return -1; |
81 | jnode = next; |
82 | } |
83 | if ( jnode != NULL ) { |
84 | if ( jnode->type == IMFS_DIRECTORY ) { |
85 | if ( jnode_has_children( jnode ) ) |
86 | jnode = jnode_get_first_child( jnode ); |
87 | } |
88 | } |
89 | } while (jnode != NULL); |
90 | |
91 | return 0; |
92 | } |
93 | |
94 | |
95 | |
96 |
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