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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