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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-08-02 14:25:34 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-08-02 14:25:34 +0000 |
commit | c6a26b52627e7ee307e71871b5a6427a061507fd (patch) | |
tree | fb5907fda6a31ac5de3fbe2075b7dc377b89d712 /nuttx/fs/fs_openblockdriver.c | |
parent | e080db993601ad735cc023ecf11bffbf70515afd (diff) | |
download | px4-nuttx-c6a26b52627e7ee307e71871b5a6427a061507fd.tar.gz px4-nuttx-c6a26b52627e7ee307e71871b5a6427a061507fd.tar.bz2 px4-nuttx-c6a26b52627e7ee307e71871b5a6427a061507fd.zip |
Add find/open/close_blockdriver()
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@796 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/fs/fs_openblockdriver.c')
-rw-r--r-- | nuttx/fs/fs_openblockdriver.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/nuttx/fs/fs_openblockdriver.c b/nuttx/fs/fs_openblockdriver.c new file mode 100644 index 000000000..b50ee2cfa --- /dev/null +++ b/nuttx/fs/fs_openblockdriver.c @@ -0,0 +1,125 @@ +/**************************************************************************** + * fs/fs_openblockdriver.c + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 <debug.h> +#include <errno.h> +#include <nuttx/fs.h> + +#include "fs_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: open_blockdriver + * + * Description: + * Return the inode of the block driver specified by 'pathname' + * + * Inputs: + * pathname - the full path to the block driver to be opened + * mountflags - if MS_RDONLY is 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 open_blockdriver(FAR const char *pathname, int mountflags, FAR struct inode **ppinode) +{ + FAR struct inode *inode; + int ret; + + /* Minimal sanity checks */ + + if (!ppinode) + { + ret = -EINVAL; + goto errout; + } + + /* Find the inode associated with this block driver name. find_blockdriver + * will perform all additional error checking. + */ + + ret = find_blockdriver(pathname, mountflags, &inode); + if (ret < 0) + { + fdbg("Failed to file %s block driver\n", pathname); + goto errout; + } + + /* Open the block driver. Note that no mutually exclusive access + * to the driver is enforced here. That must be done in the driver + * if needed. + */ + + if (inode->u.i_bops->open) + { + ret = inode->u.i_bops->open(inode); + if (ret < 0) + { + fdbg("%s driver open failed\n", pathname); + goto errout_with_inode; + } + } + + *ppinode = inode; + return OK; + +errout_with_inode: + inode_release(inode); +errout: + return ret; +} |