mirror of
https://github.com/apache/nuttx.git
synced 2026-05-28 11:56:10 +08:00
Add fs/tmpfs. Nothing much there yet
This commit is contained in:
Gregory Nutt
@@ -11013,4 +11013,6 @@
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parameters to match names used on OpenGroup.org (2015-10-02).
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parameters to match names used on OpenGroup.org (2015-10-02).
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* drivers/lcd/st7565.c: Extend to include support for the ERC12864-3.
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* drivers/lcd/st7565.c: Extend to include support for the ERC12864-3.
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From Pierre-noel Bouteville (2015-10-07).
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From Pierre-noel Bouteville (2015-10-07).
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* fs/tmpfs: Created a directory that will eventually hold a trivial
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temporary RAM file file system (2015-10-0i8).
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+27
-26
@@ -188,39 +188,40 @@ struct romfs_dirinfo_s
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* Public Data
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* Public Data
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****************************************************************************/
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#undef EXTERN
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#if defined(__cplusplus)
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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#define EXTERN extern "C"
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extern "C" {
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extern "C"
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{
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#else
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#else
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#define EXTERN extern
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#define EXTERN extern
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#endif
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#endif
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EXTERN void romfs_semtake(struct romfs_mountpt_s *rm);
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/****************************************************************************
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EXTERN void romfs_semgive(struct romfs_mountpt_s *rm);
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* Public Function Prototypes
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EXTERN int romfs_hwread(struct romfs_mountpt_s *rm, uint8_t *buffer,
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****************************************************************************/
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uint32_t sector, unsigned int nsectors);
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EXTERN int romfs_filecacheread(struct romfs_mountpt_s *rm,
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void romfs_semtake(FAR struct romfs_mountpt_s *rm);
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struct romfs_file_s *rf, uint32_t sector);
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void romfs_semgive(FAR struct romfs_mountpt_s *rm);
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EXTERN int romfs_hwconfigure(struct romfs_mountpt_s *rm);
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int romfs_hwread(FAR struct romfs_mountpt_s *rm, FAR uint8_t *buffer,
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EXTERN int romfs_fsconfigure(struct romfs_mountpt_s *rm);
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uint32_t sector, unsigned int nsectors);
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EXTERN int romfs_fileconfigure(struct romfs_mountpt_s *rm,
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int romfs_filecacheread(FAR struct romfs_mountpt_s *rm,
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struct romfs_file_s *rf);
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FAR struct romfs_file_s *rf, uint32_t sector);
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EXTERN int romfs_checkmount(struct romfs_mountpt_s *rm);
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int romfs_hwconfigure(FAR struct romfs_mountpt_s *rm);
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EXTERN int romfs_finddirentry(struct romfs_mountpt_s *rm,
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int romfs_fsconfigure(FAR struct romfs_mountpt_s *rm);
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struct romfs_dirinfo_s *dirinfo,
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int romfs_fileconfigure(FAR struct romfs_mountpt_s *rm,
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const char *path);
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FAR struct romfs_file_s *rf);
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EXTERN int romfs_parsedirentry(struct romfs_mountpt_s *rm,
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int romfs_checkmount(FAR struct romfs_mountpt_s *rm);
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uint32_t offset, uint32_t *poffset, uint32_t *pnext,
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int romfs_finddirentry(FAR struct romfs_mountpt_s *rm,
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uint32_t *pinfo, uint32_t *psize);
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FAR struct romfs_dirinfo_s *dirinfo,
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EXTERN int romfs_parsefilename(struct romfs_mountpt_s *rm, uint32_t offset,
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FAR const char *path);
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char *pname);
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int romfs_parsedirentry(FAR struct romfs_mountpt_s *rm,
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EXTERN int romfs_datastart(struct romfs_mountpt_s *rm, uint32_t offset,
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uint32_t offset, FAR uint32_t *poffset, FAR uint32_t *pnext,
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uint32_t *start);
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FAR uint32_t *pinfo, FAR uint32_t *psize);
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int romfs_parsefilename(FAR struct romfs_mountpt_s *rm, uint32_t offset,
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FAR char *pname);
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int romfs_datastart(FAR struct romfs_mountpt_s *rm, uint32_t offset,
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FAR uint32_t *start);
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#undef EXTERN
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#undef EXTERN
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#if defined(__cplusplus)
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#if defined(__cplusplus)
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@@ -0,0 +1,51 @@
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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config FS_TMPFS
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bool "TMPFS file system"
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default n
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depends on !DISABLE_MOUNTPOINT && EXPERIMENTAL
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select FS_READABLE
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select FS_WRITABLE
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---help---
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Enable TMPFS filesystem support
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if FS_TMPFS
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config FS_TMPFS_DIRECTORY_ALLOCGUARD
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int "Directory object over-allocation"
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default 64
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---help---
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In order to avoid frequent reallocations, a little more memory than
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needed is always allocated. This permits the directory to grow
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without so many realloctions.
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config FS_TMPFS_DIRECTORY_FREEGUARD
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int "Directory under free"
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default 128
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---help---
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In order to avoid frequent reallocations, a lot of free memory has
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to be available before a directory entry shrinks (via reallocation)
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little more memory than needed is always allocated. This permits
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the directory to shrink without so many realloctions.
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config FS_TMPFS_FILE_ALLOCGUARD
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int "Directory object over-allocation"
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default 512
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---help---
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In order to avoid frequent reallocations, a little more memory than
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needed is always allocated. This permits the file to grow without
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so many realloctions.
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config FS_TMPFS_FILE_FREEGUARD
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int "Directory under free"
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default 1024
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---help---
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In order to avoid frequent reallocations, a lot of free memory has
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to be available before a directory entry shrinks (via reallocation)
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little more memory than needed is always allocated. This permits
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the file to shrink without so many realloctions.
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endif
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@@ -0,0 +1,47 @@
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############################################################################
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# fs/romfs/Make.defs
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#
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# Copyright (C) 2008, 2011, 2013 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <gnutt@nuttx.org>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# 3. Neither the name Nuttx nor the names of its contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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ifeq ($(CONFIG_FS_ROMFS),y)
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# Files required for ROMFS file system support
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ASRCS +=
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CSRCS += fs_romfs.c fs_romfsutil.c
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# Include ROMFS build support
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DEPPATH += --dep-path romfs
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VPATH += :romfs
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endif
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@@ -0,0 +1,169 @@
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/****************************************************************************
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* fs/tmpfs/fs_tmpfs.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __FS_TMPFS_FS_TMPFS_H
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#define __FS_TMPFS_FS_TMPFS_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <semaphore.h>
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#include <nuttx/fs/fs.h>
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#ifndef CONFIG_DISABLE_MOUNTPOINT
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define TFO_FLAG_UNLINKED (1 << 0) /* Bit 0: File is unlinked */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* TMPFS memory object types */
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enum tmpfs_objtype_e
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{
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TMPFS_DIRECTORY = 0, /* Directory */
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TMPFS_REGULAR /* Regular file */
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};
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/* The generic form of a TMPFS memory object */
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struct tmpfs_object_s
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{
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size_t to_alloc; /* Allocated size of the memory object */
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uint8_t to_type; /* See enum tmpfs_objtype_e */
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uint8_t to_refs; /* Reference count */
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sem_t to_exclsem; /* Supports exclusive access to the object */
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};
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/* The form of one directory entry */
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struct tmpfs_dirent_s
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{
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FAR struct tmpfs_object_s *rde_object;
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FAR char *rde_name;
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};
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/* The form of a directory memory object */
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struct tmpfs_directory_s
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{
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/* First fields must match common TMPFS object layout */
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size_t tdo_alloc; /* Allocated size of the directory object */
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uint8_t tdo_type; /* See enum tmpfs_objtype_e */
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uint8_t tdo_refs; /* Reference count */
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sem_t tdo_exclsem; /* Supports exclusive access to the directory */
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/* Remaining fields are unique to a directory object */
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uint16_t tdo_nentries; /* Number of directory entries */
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struct tmpfs_dirent_s tdo_entry[1];
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};
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#define SIZEOF_TMPFS_DIRECTORY(n) \
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(sizeof(struct tmpfs_directory_s) + ((n) - 1)*sizeof(struct tmpfs_dirent_s))
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/* The form of a regular file memory object
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*
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* NOTE that in this very simplified implementation, there is no per-open
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* state. The file memory object also serves as the open file object,
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* saving an allocation. This has the negative side effect that no per-
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* open state can be retained (such as open flags).
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*/
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struct tmpfs_file_s
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{
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/* First fields must match common TMPFS object layout */
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size_t tfo_alloc; /* Allocated size of the file object */
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uint8_t tfo_type; /* See enum tmpfs_objtype_e */
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uint8_t tfo_refs; /* Reference count */
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sem_t tfo_exclsem; /* Supports exclusive access to the file */
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/* Remaining fields are unique to a directory object */
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uint8_t tfo_flags; /* See TFO_FLAG_* definitions */
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size_t tfo_size; /* Valid file size */
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uint8_t tfo_data[1]; /* File data starts here */
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};
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#define SIZEOF_TMPFS_DIRECTORY(n) (sizeof(struct tmpfs_file_s) + (n) - 1)
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/* This structure represents one instance of a TMPFS file system */
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struct tmpfs_s
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{
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/* The root directory */
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FAR struct tmpfs_directory_s *r_root;
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sem_t r_exclsem; /* Supports exclusive access to the file system */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__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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EXTERN const struct mountpt_operations tmpfs_operations;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __FS_TMPFS_FS_TMPFS_H */
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