200 lines
6.9 KiB
C
200 lines
6.9 KiB
C
/****************************************************************************
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* include/nuttx/fs/automount.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_FS_AUTOMOUNT_H
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#define __INCLUDE_NUTTX_FS_AUTOMOUNT_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#include <signal.h>
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#include <nuttx/irq.h>
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#ifdef CONFIG_FS_AUTOMOUNTER
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************
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* Automounter configuration
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* CONFIG_FS_AUTOMOUNTER - Enables automount support
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*
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* Prerequisites:
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* CONFIG_SCHED_WORKQUEUE - Work queue support is required
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* And others that would only matter if you are working in a very minimal
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* configuration.
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*/
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/* Helper macros ************************************************************/
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#define AUTOMOUNT_ATTACH(s,isr,arg) ((s)->attach(s,isr,arg))
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#define AUTOMOUNT_DETACH(s) ((s)->attach(s,NULL,NULL))
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#define AUTOMOUNT_ENABLE(s) ((s)->enable(s,true))
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#define AUTOMOUNT_DISABLE(s) ((s)->enable(s,false))
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#define AUTOMOUNT_INSERTED(s) ((s)->inserted(s))
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This is the type of the automount media change handler. The lower level
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* code will intercept the interrupt and provide the upper level with the
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* private data that was provided when the interrupt was attached and will
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* also provide an indication if the media was inserted or removed.
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*/
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struct automount_lower_s; /* Forward reference. Defined below */
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typedef CODE int
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(*automount_handler_t)(FAR const struct automount_lower_s *lower,
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FAR void *arg, bool inserted);
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#ifdef CONFIG_FS_AUTOMOUNTER_DRIVER
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/* A reference to this structure is provided with the FIOC_NOTIFY IOCTL
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* command and describes the conditions under which the client would like
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* to receive notification.
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*/
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struct automount_notify_s
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{
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bool an_mount; /* FS mount to be notified */
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bool an_umount; /* FS umount to be notified */
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struct sigevent an_event; /* Describe the way a task is to be notified */
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};
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#endif /* CONFIG_FS_AUTOMOUNTER_DRIVER */
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/* A reference to a structure of this type must be passed to the FS
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* automounter. This structure provides information about the volume to be
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* mounted and provides board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the automounter and is presumed to persist while the automounter
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* is active.
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*/
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struct automount_lower_s
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{
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/* Volume characterization */
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FAR const char *fstype; /* Type of file system */
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FAR const char *blockdev; /* Path to the block device */
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FAR const char *mountpoint; /* Location to mount the volume */
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/* Debounce delay in system clock ticks. Automount operation will not
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* be performed until the insertion/removal state has been unchanges
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* for this duration.
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*/
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uint32_t ddelay;
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/* Unmount delay time in system clock ticks. If a volume has open
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* references at the time that the media is removed, then we will be
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* unable to unmount it. In that case, hopefully, the clients of the
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* mount will eventually fail with file access errors and eventually close
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* their references. So, at some time later, it should be possible to
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* unmount the volume. This delay specifies the time between umount
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* retries.
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*/
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uint32_t udelay;
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/* Interrupt related operations all hidden behind callbacks to isolate the
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* automounter from differences in interrupt handling by varying boards
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* and MCUs. Board interrupts should be configured both insertion and
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* removal of the media can be detected.
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*
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* attach - Attach or detach the media change interrupt handler to the
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* board level interrupt
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* enable - Enable or disable the media change interrupt
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*/
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CODE int (*attach)(FAR const struct automount_lower_s *lower,
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automount_handler_t isr, FAR void *arg);
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CODE void (*enable)(FAR const struct automount_lower_s *lower,
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bool enable);
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CODE bool (*inserted)(FAR const struct automount_lower_s *lower);
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: automount_initialize
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*
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* Description:
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* Configure the automounter.
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*
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* Input Parameters:
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* lower - Persistent board configuration data
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*
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* Returned Value:
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* A void* handle.
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* The only use for this handle is with automount_uninitialize().
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* NULL is returned on any failure.
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*
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****************************************************************************/
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FAR void *automount_initialize(FAR const struct automount_lower_s *lower);
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/****************************************************************************
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* Name: automount_uninitialize
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*
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* Description:
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* Stop the automounter and free resources that it used. NOTE that the
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* mount is left in its last state mounted/unmounted state.
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*
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* Input Parameters:
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* handle - The value previously returned by automount_initialize();
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void automount_uninitialize(FAR void *handle);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_FS_AUTOMOUNTER */
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#endif /* __INCLUDE_NUTTX_FS_AUTOMOUNT_H */
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