525 lines
13 KiB
C
525 lines
13 KiB
C
/****************************************************************************
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* drivers/bch/bchdev_driver.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <errno.h>
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#include <poll.h>
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#include <assert.h>
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#include <debug.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/drivers/drivers.h>
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#include "bch.h"
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/****************************************************************************
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* Pre-processor Definitions
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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 bch_open(FAR struct file *filep);
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static int bch_close(FAR struct file *filep);
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static off_t bch_seek(FAR struct file *filep, off_t offset, int whence);
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static ssize_t bch_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t bch_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int bch_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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static int bch_poll(FAR struct file *filep, FAR struct pollfd *fds,
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bool setup);
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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static int bch_unlink(FAR struct inode *inode);
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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const struct file_operations bch_fops =
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{
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bch_open, /* open */
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bch_close, /* close */
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bch_read, /* read */
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bch_write, /* write */
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bch_seek, /* seek */
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bch_ioctl, /* ioctl */
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bch_poll /* poll */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, bch_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: bch_poll
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****************************************************************************/
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static int bch_poll(FAR struct file *filep, FAR struct pollfd *fds,
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bool setup)
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{
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if (setup)
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{
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fds->revents |= (fds->events & (POLLIN | POLLOUT));
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if (fds->revents != 0)
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{
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nxsem_post(fds->sem);
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}
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}
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return OK;
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}
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/****************************************************************************
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* Name: bch_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 bch_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bchlib_s *bch;
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int ret = OK;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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/* Increment the reference count */
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return ret;
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}
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if (bch->refs == MAX_OPENCNT)
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{
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ret = -EMFILE;
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}
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else
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{
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bch->refs++;
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}
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bchlib_semgive(bch);
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return ret;
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}
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/****************************************************************************
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* Name: bch_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 bch_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bchlib_s *bch;
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int ret = OK;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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/* Get exclusive access */
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return ret;
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}
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/* Flush any dirty pages remaining in the cache */
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bchlib_flushsector(bch);
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/* Decrement the reference count (I don't use bchlib_decref() because I
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* want the entire close operation to be atomic wrt other driver
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* operations.
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*/
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if (bch->refs == 0)
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{
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ret = -EIO;
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}
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else
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{
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bch->refs--;
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/* If the reference count decremented to zero AND if the character
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* driver has been unlinked, then teardown the BCH device now.
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*/
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if (bch->refs == 0 && bch->unlinked)
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{
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/* Tear the driver down now. */
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ret = bchlib_teardown((FAR void *)bch);
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/* bchlib_teardown() would only fail if there are outstanding
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* references on the device. Since we know that is not true, it
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* should not fail at all.
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*/
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DEBUGASSERT(ret >= 0);
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if (ret >= 0)
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{
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/* Return without releasing the stale semaphore */
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return OK;
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}
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}
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}
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bchlib_semgive(bch);
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return ret;
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}
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/****************************************************************************
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* Name: bch_seek
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****************************************************************************/
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static off_t bch_seek(FAR struct file *filep, off_t offset, int whence)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bchlib_s *bch;
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off_t newpos;
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off_t ret;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return ret;
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}
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/* Determine the new, requested file position */
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switch (whence)
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{
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case SEEK_CUR:
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newpos = filep->f_pos + offset;
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break;
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case SEEK_SET:
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newpos = offset;
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break;
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case SEEK_END:
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newpos = bch->sectsize * bch->nsectors + offset;
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break;
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default:
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/* Return EINVAL if the whence argument is invalid */
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bchlib_semgive(bch);
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return -EINVAL;
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}
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/* Opengroup.org:
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*
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* "The lseek() function shall allow the file offset to be set beyond the
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* end of the existing data in the file. If data is later written at this
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* point, subsequent reads of data in the gap shall return bytes with the
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* value 0 until data is actually written into the gap."
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*
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* We can conform to the first part, but not the second. But return EINVAL
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* if:
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*
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* "...the resulting file offset would be negative for a regular file,
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* block special file, or directory."
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*/
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if (newpos >= 0)
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{
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filep->f_pos = newpos;
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ret = newpos;
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}
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else
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{
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ret = -EINVAL;
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}
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bchlib_semgive(bch);
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return ret;
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}
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/****************************************************************************
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* Name: bch_read
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****************************************************************************/
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static ssize_t bch_read(FAR struct file *filep, FAR char *buffer, size_t len)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bchlib_s *bch;
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int ret;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return (ssize_t)ret;
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}
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ret = bchlib_read(bch, buffer, filep->f_pos, len);
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if (ret > 0)
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{
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filep->f_pos += len;
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}
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bchlib_semgive(bch);
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return ret;
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}
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/****************************************************************************
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* Name: bch_write
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****************************************************************************/
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static ssize_t bch_write(FAR struct file *filep, FAR const char *buffer,
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size_t len)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bchlib_s *bch;
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int ret = -EACCES;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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if (!bch->readonly)
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{
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return (ssize_t)ret;
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}
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ret = bchlib_write(bch, buffer, filep->f_pos, len);
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if (ret > 0)
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{
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filep->f_pos += len;
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}
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bchlib_semgive(bch);
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}
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return ret;
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}
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/****************************************************************************
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* Name: bch_ioctl
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*
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* Description:
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* Handle IOCTL commands
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*
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****************************************************************************/
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static int bch_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct bchlib_s *bch;
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int ret = -ENOTTY;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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/* Process the call according to the command */
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switch (cmd)
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{
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/* This isa request to get the private data structure */
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case DIOC_GETPRIV:
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{
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FAR struct bchlib_s **bchr =
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(FAR struct bchlib_s **)((uintptr_t)arg);
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return ret;
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}
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if (!bchr || bch->refs == MAX_OPENCNT)
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{
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ret = -EINVAL;
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}
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else
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{
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bch->refs++;
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*bchr = bch;
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ret = OK;
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}
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bchlib_semgive(bch);
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}
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break;
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/* This is a required to return the geometry of the underlying block
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* driver.
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*/
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case BIOC_GEOMETRY:
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{
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FAR struct geometry *geo = (FAR struct geometry *)((uintptr_t)arg);
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DEBUGASSERT(geo != NULL && bch->inode && bch->inode->u.i_bops &&
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bch->inode->u.i_bops->geometry);
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ret = bch->inode->u.i_bops->geometry(bch->inode, geo);
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if (ret < 0)
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{
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ferr("ERROR: geometry failed: %d\n", -ret);
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}
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else if (!geo->geo_available)
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{
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ferr("ERROR: geometry failed: %d\n", -ret);
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ret = -ENODEV;
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}
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}
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break;
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case BIOC_FLUSH:
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{
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/* Flush any dirty pages remaining in the cache */
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ret = bchlib_flushsector(bch);
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}
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break;
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#ifdef CONFIG_BCH_ENCRYPTION
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/* This is a request to set the encryption key? */
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case DIOC_SETKEY:
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{
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memcpy(bch->key, (FAR void *)arg, CONFIG_BCH_ENCRYPTION_KEY_SIZE);
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ret = OK;
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}
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break;
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#endif
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/* Otherwise, pass the IOCTL command on to the contained block
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* driver.
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*/
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default:
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{
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FAR struct inode *bchinode = bch->inode;
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/* Does the block driver support the ioctl method? */
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if (bchinode->u.i_bops->ioctl != NULL)
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{
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ret = bchinode->u.i_bops->ioctl(bchinode, cmd, arg);
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}
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}
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break;
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}
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return ret;
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}
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/****************************************************************************
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* Name: bch_unlink
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*
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* Handle unlinking of the BCH device
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*
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****************************************************************************/
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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static int bch_unlink(FAR struct inode *inode)
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{
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FAR struct bchlib_s *bch;
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int ret = OK;
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DEBUGASSERT(inode && inode->i_private);
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bch = (FAR struct bchlib_s *)inode->i_private;
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/* Get exclusive access to the BCH device */
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ret = bchlib_semtake(bch);
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if (ret < 0)
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{
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return ret;
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}
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/* Indicate that the driver has been unlinked */
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bch->unlinked = true;
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/* If there are no open references to the driver then teardown the BCH
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* device now.
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*/
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if (bch->refs == 0)
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{
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/* Tear the driver down now. */
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ret = bchlib_teardown((FAR void *)bch);
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/* bchlib_teardown() would only fail if there are outstanding
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* references on the device. Since we know that is not true, it
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* should not fail at all.
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*/
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DEBUGASSERT(ret >= 0);
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if (ret >= 0)
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{
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/* Return without releasing the stale semaphore */
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return OK;
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}
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}
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bchlib_semgive(bch);
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return ret;
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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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