[07a3253d] | 1 | /* |
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| 2 | * unmount() - Unmount a File System |
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| 3 | * |
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[50f32b11] | 4 | * This routine is not defined in the POSIX 1003.1b standard but |
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[07a3253d] | 5 | * in some form is supported on most UNIX and POSIX systems. This |
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| 6 | * routine is necessary to mount instantiations of a file system |
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| 7 | * into the file system name space. |
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| 8 | * |
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[71c012af] | 9 | * COPYRIGHT (c) 1989-2010. |
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[07a3253d] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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| 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[0eae36c7] | 14 | * http://www.rtems.com/license/LICENSE. |
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[07a3253d] | 15 | */ |
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| 16 | |
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[9c49db4] | 17 | #if HAVE_CONFIG_H |
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[3b7c123] | 18 | #include "config.h" |
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[9c49db4] | 19 | #endif |
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| 20 | |
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[07a3253d] | 21 | #include <errno.h> |
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| 22 | |
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[3ba74c73] | 23 | #include <rtems/libio_.h> |
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[07a3253d] | 24 | |
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[847ad44] | 25 | static bool contains_root_or_current_directory( |
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| 26 | const rtems_filesystem_mount_table_entry_t *mt_entry |
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| 27 | ) |
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| 28 | { |
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| 29 | const rtems_filesystem_location_info_t *root = |
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| 30 | &rtems_filesystem_root->location; |
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| 31 | const rtems_filesystem_location_info_t *current = |
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| 32 | &rtems_filesystem_current->location; |
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| 33 | |
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| 34 | return mt_entry == root->mt_entry || mt_entry == current->mt_entry; |
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| 35 | } |
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| 36 | |
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[3b7c123] | 37 | int unmount( const char *path ) |
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[9c30d6a9] | 38 | { |
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[3b7c123] | 39 | int rv = 0; |
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| 40 | rtems_filesystem_eval_path_context_t ctx; |
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[2563410] | 41 | int eval_flags = RTEMS_FS_FOLLOW_LINK; |
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[3b7c123] | 42 | const rtems_filesystem_location_info_t *currentloc = |
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| 43 | rtems_filesystem_eval_path_start( &ctx, path, eval_flags ); |
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| 44 | rtems_filesystem_mount_table_entry_t *mt_entry = currentloc->mt_entry; |
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| 45 | |
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| 46 | if ( rtems_filesystem_location_is_root( currentloc ) ) { |
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[847ad44] | 47 | if ( !contains_root_or_current_directory( mt_entry ) ) { |
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| 48 | const rtems_filesystem_operations_table *mt_point_ops = |
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| 49 | mt_entry->mt_point_node->location.mt_entry->ops; |
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[da154e14] | 50 | |
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[847ad44] | 51 | rv = (*mt_point_ops->unmount_h)( mt_entry ); |
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| 52 | if ( rv == 0 ) { |
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| 53 | rtems_id self_task_id = rtems_task_self(); |
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| 54 | rtems_filesystem_mt_entry_declare_lock_context( lock_context ); |
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[3b7c123] | 55 | |
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[847ad44] | 56 | rtems_filesystem_mt_entry_lock( lock_context ); |
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| 57 | mt_entry->unmount_task = self_task_id; |
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| 58 | mt_entry->mounted = false; |
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| 59 | rtems_filesystem_mt_entry_unlock( lock_context ); |
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| 60 | } |
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| 61 | } else { |
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| 62 | errno = EBUSY; |
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| 63 | rv = -1; |
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[3b7c123] | 64 | } |
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| 65 | } else { |
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| 66 | errno = EACCES; |
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| 67 | rv = -1; |
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[9c30d6a9] | 68 | } |
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| 69 | |
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[3b7c123] | 70 | rtems_filesystem_eval_path_cleanup( &ctx ); |
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[07a3253d] | 71 | |
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[847ad44] | 72 | if ( rv == 0 ) { |
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| 73 | rtems_event_set out; |
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| 74 | rtems_status_code sc = rtems_event_receive( |
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| 75 | RTEMS_FILESYSTEM_UNMOUNT_EVENT, |
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| 76 | RTEMS_EVENT_ALL | RTEMS_WAIT, |
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| 77 | RTEMS_NO_TIMEOUT, |
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| 78 | &out |
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| 79 | ); |
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| 80 | |
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| 81 | if ( sc != RTEMS_SUCCESSFUL ) { |
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| 82 | rtems_fatal_error_occurred( 0xdeadbeef ); |
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| 83 | } |
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| 84 | } |
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| 85 | |
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[3b7c123] | 86 | return rv; |
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[07a3253d] | 87 | } |
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