diff options
Diffstat (limited to 'nuttx/fs/fs_findblockdriver.c')
-rw-r--r-- | nuttx/fs/fs_findblockdriver.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/nuttx/fs/fs_findblockdriver.c b/nuttx/fs/fs_findblockdriver.c new file mode 100644 index 000000000..febf28a7e --- /dev/null +++ b/nuttx/fs/fs_findblockdriver.c @@ -0,0 +1,131 @@ +/**************************************************************************** + * fs/fs_openblockdriver.c + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in pathname and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of pathname code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <sys/types.h> +#include <sys/mount.h> +#include <debug.h> +#include <errno.h> +#include <nuttx/fs/fs.h> + +#include "fs_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: find_blockdriver + * + * Description: + * Return the inode of the block driver specified by 'pathname' + * + * Inputs: + * pathname - the full path to the block driver to be located + * mountflags - if MS_RDONLY is not set, then driver must support write + * operations (see include/sys/mount.h) + * ppinode - address of the location to return the inode reference + * + * Return: + * Returns zero on success or a negated errno on failure: + * + * EINVAL - pathname or pinode is NULL + * ENOENT - No block driver of this name is registered + * ENOTBLK - The inode associated with the pathname is not a block driver + * EACCESS - The MS_RDONLY option was not set but this driver does not + * support write access + * + ****************************************************************************/ + +int find_blockdriver(FAR const char *pathname, int mountflags, FAR struct inode **ppinode) +{ + FAR struct inode *inode; + int ret = 0; /* Assume success */ + + /* Sanity checks */ + +#ifdef CONFIG_DEBUG + if (!pathname || !ppinode) + { + ret = -EINVAL; + goto errout; + } +#endif + + /* Find the inode registered with this pathname */ + + inode = inode_find(pathname, NULL); + if (!inode) + { + fdbg("Failed to find %s\n", pathname); + ret = -ENOENT; + goto errout; + } + + /* Verify that the inode is a block driver. */ + + if (!INODE_IS_BLOCK(inode)) + { + fdbg("%s is not a block driver\n", pathname); + ret = -ENOTBLK; + goto errout_with_inode; + } + + /* Make sure that the inode supports the requested access */ + + if (!inode->u.i_bops || !inode->u.i_bops->read || + (!inode->u.i_bops->write && (mountflags & MS_RDONLY) == 0)) + { + fdbg("%s does not support requested access\n", pathname); + ret = -EACCES; + goto errout_with_inode; + } + + *ppinode = inode; + return OK; + +errout_with_inode: + inode_release(inode); +errout: + return ret; +} |