367 lines
11 KiB
C
367 lines
11 KiB
C
/****************************************************************************
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* fs/driver/fs_blockpartition.c
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*
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* Copyright (C) 2018 Pinecone Inc. All rights reserved.
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* Author: Xiang Xiao <xiaoxiang@pinecone.net>
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/ioctl.h>
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#include <nuttx/mtd/mtd.h>
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#include <nuttx/kmalloc.h>
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#include "driver/driver.h"
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#include "inode/inode.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct part_struct_s
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{
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FAR struct inode *parent;
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size_t firstsector;
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size_t nsectors;
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int part_open(FAR struct inode *inode);
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static int part_close(FAR struct inode *inode);
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static ssize_t part_read(FAR struct inode *inode, unsigned char *buffer,
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size_t start_sector, unsigned int nsectors);
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#ifdef CONFIG_FS_WRITABLE
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static ssize_t part_write(FAR struct inode *inode, const unsigned char *buffer,
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size_t start_sector, unsigned int nsectors);
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#endif
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static int part_geometry(FAR struct inode *inode, struct geometry *geometry);
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static int part_ioctl(FAR struct inode *inode, int cmd, unsigned long arg);
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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static int part_unlink(FAR struct inode *inode);
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct block_operations g_part_bops =
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{
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part_open, /* open */
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part_close, /* close */
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part_read, /* read */
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#ifdef CONFIG_FS_WRITABLE
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part_write, /* write */
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#else
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NULL, /* write */
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#endif
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part_geometry, /* geometry */
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part_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, part_unlink /* unlink */
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: part_open
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*
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* Description: Open the block device
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*
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****************************************************************************/
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static int part_open(FAR struct inode *inode)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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int ret = OK;
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/* Open the parent block device */
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if (parent->u.i_bops->open)
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{
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ret = parent->u.i_bops->open(parent);
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}
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return ret;
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}
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/****************************************************************************
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* Name: part_close
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*
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* Description: close the block device
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*
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****************************************************************************/
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static int part_close(FAR struct inode *inode)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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int ret = OK;
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if (parent->u.i_bops->close)
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{
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ret = parent->u.i_bops->close(parent);
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}
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return ret;
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}
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/****************************************************************************
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* Name: part_read
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*
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* Description: Read the specified number of sectors
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*
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****************************************************************************/
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static ssize_t part_read(FAR struct inode *inode, unsigned char *buffer,
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size_t start_sector, unsigned int nsectors)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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if (start_sector + nsectors > dev->nsectors)
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{
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nsectors = dev->nsectors - start_sector;
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}
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start_sector += dev->firstsector;
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return parent->u.i_bops->read(parent, buffer, start_sector, nsectors);
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}
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/****************************************************************************
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* Name: part_write
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*
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* Description: Write (or buffer) the specified number of sectors
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*
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****************************************************************************/
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#ifdef CONFIG_FS_WRITABLE
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static ssize_t part_write(FAR struct inode *inode, const unsigned char *buffer,
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size_t start_sector, unsigned int nsectors)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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if (start_sector + nsectors > dev->nsectors)
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{
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nsectors = dev->nsectors - start_sector;
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}
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start_sector += dev->firstsector;
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return parent->u.i_bops->write(parent, buffer, start_sector, nsectors);
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}
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#endif
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/****************************************************************************
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* Name: part_geometry
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*
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* Description: Return device geometry
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*
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****************************************************************************/
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static int part_geometry(FAR struct inode *inode, struct geometry *geometry)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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int ret;
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ret = parent->u.i_bops->geometry(parent, geometry);
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if (ret >= 0)
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{
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geometry->geo_nsectors = dev->nsectors;
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}
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return ret;
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}
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/****************************************************************************
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* Name: part_ioctl
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*
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* Description: Return device geometry
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*
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****************************************************************************/
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static int part_ioctl(FAR struct inode *inode, int cmd, unsigned long arg)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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int ret = -ENOTTY;
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if (parent->u.i_bops->ioctl)
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{
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if (cmd == MTDIOC_PROTECT || cmd == MTDIOC_UNPROTECT)
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{
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FAR struct mtd_protect_s *prot = (FAR struct mtd_protect_s *)arg;
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prot->startblock += dev->firstsector;
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}
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ret = parent->u.i_bops->ioctl(parent, cmd, arg);
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if (ret >= 0)
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{
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if (cmd == BIOC_XIPBASE || cmd == MTDIOC_XIPBASE)
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{
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FAR void **base = (FAR void **)arg;
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struct geometry geo;
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ret = parent->u.i_bops->geometry(parent, &geo);
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if (ret >= 0)
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{
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*(FAR uint8_t *)base += dev->firstsector * geo.geo_sectorsize;
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}
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}
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else if (cmd == MTDIOC_GEOMETRY)
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{
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FAR struct mtd_geometry_s *mgeo = (FAR struct mtd_geometry_s *)arg;
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uint32_t blkper = mgeo->erasesize / mgeo->blocksize;
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mgeo->neraseblocks = dev->nsectors / blkper;
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}
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: part_unlink
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****************************************************************************/
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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static int part_unlink(FAR struct inode *inode)
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{
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FAR struct part_struct_s *dev = inode->i_private;
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FAR struct inode *parent = dev->parent;
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inode_release(parent);
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kmm_free(dev);
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return OK;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: register_blockpartition
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*
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* Description:
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* Register a block partition driver inode the pseudo file system.
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*
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* Input Parameters:
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* partition - The path to the partition inode
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* parent - The path to the parent inode
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* firstsector - The offset in sectors to the partition
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* nsectors - The number of sectors in the partition
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*
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* Returned Value:
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* Zero on success (with the inode point in 'inode'); A negated errno
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* value is returned on a failure (all error values returned by
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* inode_reserve):
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*
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* EINVAL - 'path' is invalid for this operation
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* EEXIST - An inode already exists at 'path'
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* ENOMEM - Failed to allocate in-memory resources for the operation
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*
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****************************************************************************/
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int register_blockpartition(FAR const char *partition,
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mode_t mode, FAR const char *parent,
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size_t firstsector, size_t nsectors)
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{
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FAR struct part_struct_s *dev;
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int ret;
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/* Allocate a partition device structure */
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dev = kmm_zalloc(sizeof(*dev));
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if (!dev)
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{
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return -ENOMEM;
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}
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dev->firstsector = firstsector;
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dev->nsectors = nsectors;
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/* Find the block driver */
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if (mode & (S_IWOTH | S_IWGRP | S_IWUSR))
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{
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ret = find_blockdriver(parent, 0, &dev->parent);
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}
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else
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{
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ret = find_blockdriver(parent, MS_RDONLY, &dev->parent);
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}
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if (ret < 0)
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{
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goto errout_free;
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}
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/* Inode private data is a reference to the partition device structure */
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ret = register_blockdriver(partition, &g_part_bops, mode, dev);
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if (ret < 0)
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{
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goto errout_release;
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}
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return OK;
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errout_release:
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inode_release(dev->parent);
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errout_free:
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kmm_free(dev);
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return ret;
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}
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