122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/****************************************************************************
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* fs/driver/fs_findblockdriver.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/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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finfo("pathname=\"%s\"\n", pathname);
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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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