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drivers/ramdisk.c and include/nuttx/fs/ramdisk.h: Add logic to dispose of the drvier and RAM buffer when the RAM disk has been unlinked and all open references to the RAM disk have been closed. Add new parameters to romdisk() to specify what should be done with the RAM/ROM buffer -- Should it be freed or not? Changed all calls to ramdisk() to use these new parameters.

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This commit is contained in:
Gregory Nutt
2015-02-01 07:24:16 -06:00
parent 962e22e795
commit 2407008b6e
7 changed files with 265 additions and 132 deletions
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include/nuttx/fs/ramdisk.h
+16 -7
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@@ -1,7 +1,7 @@
/****************************************************************************
* include/nuttx/fs/ramdisk.h
*
* Copyright (C) 2008-2009, 2012-2013 Gregory Nutt. All rights reserved.
* Copyright (C) 2008-2009, 2012-2013, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -48,6 +48,14 @@
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Values for rdflags */
#define RDFLAG_WRENABLED (1 << 0) /* Bit 0: 1=Can write to RAM disk */
#define RDFLAG_FUNLINK (1 << 1) /* Bit 1: 1=Free memory when unlinked */
/* For internal use by the driver only */
#define RDFLAG_UNLINKED (1 << 2) /* Bit 2: 1=Driver has been unlinked */
/****************************************************************************
* Type Definitions
@@ -59,7 +67,8 @@
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
extern "C"
{
#else
#define EXTERN extern
#endif
@@ -74,7 +83,7 @@ extern "C" {
* minor: Selects suffix of device named /dev/ramN, N={1,2,3...}
* nsectors: Number of sectors on device
* sectize: The size of one sector
* writeenabled: true: can write to ram disk
* rdflags: See RDFLAG_* definitions
* buffer: RAM disk backup memory
*
* Returned Valued:
@@ -83,12 +92,12 @@ extern "C" {
****************************************************************************/
#ifdef CONFIG_FS_WRITABLE
EXTERN int ramdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
uint16_t sectize, bool writeenabled);
int ramdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
uint16_t sectize, uint8_t rdflags);
#define romdisk_register(m,b,n,s) ramdisk_register(m,b,n,s,0)
#else
EXTERN int romdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
uint16_t sectize);
int romdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
uint16_t sectize);
#endif
#undef EXTERN