992b293122
fs/driver and fs/mount: Add mount() support for file systems that require MTD drivers (vs. block drivers).
fs/drivers: Add support for named MTD drivers in the psuedo file system. This will, eventually, allow us to mount file systems that need MTD drivers without having to fake an intervening block driver.
135 lines
4.5 KiB
C
135 lines
4.5 KiB
C
/****************************************************************************
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* fs/driver/fs_findblockdriver.c
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*
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* Copyright (C) 2008, 2017 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 pathname 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 pathname 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 <sys/types.h>
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#include <sys/mount.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/fs/fs.h>
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#include "inode/inode.h"
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#include "driver/driver.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: find_blockdriver
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*
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* Description:
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* Return the inode of the block driver specified by 'pathname'
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*
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* Input Parameters:
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* pathname - The full path to the block driver to be located
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* mountflags - If MS_RDONLY is not set, then driver must support write
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* operations (see include/sys/mount.h)
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* ppinode - Address of the location to return the inode reference
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*
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* Returned Value:
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* Returns zero on success or a negated errno on failure:
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*
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* ENOENT - No block driver of this name is registered
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* ENOTBLK - The inode associated with the pathname is not a block driver
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* EACCESS - The MS_RDONLY option was not set but this driver does not
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* support write access
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*
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****************************************************************************/
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int find_blockdriver(FAR const char *pathname, int mountflags,
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FAR struct inode **ppinode)
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{
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struct inode_search_s desc;
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FAR struct inode *inode;
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int ret = 0; /* Assume success */
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DEBUGASSERT(pathname != NULL || ppinode != NULL);
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/* Find the inode registered with this pathname */
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SETUP_SEARCH(&desc, pathname, false);
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ret = inode_find(&desc);
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if (ret < 0)
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{
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ferr("ERROR: Failed to find %s\n", pathname);
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ret = -ENOENT;
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goto errout_with_search;
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}
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/* Get the search results */
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inode = desc.node;
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DEBUGASSERT(inode != NULL);
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/* Verify that the inode is a block driver. */
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if (!INODE_IS_BLOCK(inode))
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{
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ferr("ERROR: %s is not a block driver\n", pathname);
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ret = -ENOTBLK;
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goto errout_with_inode;
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}
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/* Make sure that the inode supports the requested access */
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if (!inode->u.i_bops || !inode->u.i_bops->read ||
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(!inode->u.i_bops->write && (mountflags & MS_RDONLY) == 0))
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{
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ferr("ERROR: %s does not support requested access\n", pathname);
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ret = -EACCES;
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goto errout_with_inode;
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}
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*ppinode = inode;
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RELEASE_SEARCH(&desc);
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return OK;
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errout_with_inode:
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inode_release(inode);
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errout_with_search:
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RELEASE_SEARCH(&desc);
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return ret;
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}
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