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incubator-nuttx/fs/binfs/fs_binfs.c

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/****************************************************************************
* fs/binfs/fs_binfs.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/statfs.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/lib/builtin.h>
#include "inode/inode.h"
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_BINFS)
/****************************************************************************
* Private Types
****************************************************************************/
struct binfs_dir_s
{
struct fs_dirent_s base; /* VFS directory structure */
unsigned int index; /* Index to the next named entry point */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int binfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode);
static int binfs_close(FAR struct file *filep);
static ssize_t binfs_read(FAR struct file *filep,
FAR char *buffer, size_t buflen);
static int binfs_ioctl(FAR struct file *filep,
int cmd, unsigned long arg);
static int binfs_dup(FAR const struct file *oldp, FAR struct file *newp);
static int binfs_fstat(FAR const struct file *filep,
FAR struct stat *buf);
static int binfs_opendir(FAR struct inode *mountpt,
FAR const char *relpath,
FAR struct fs_dirent_s **dir);
static int binfs_closedir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static int binfs_readdir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir,
FAR struct dirent *entry);
static int binfs_rewinddir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir);
static int binfs_bind(FAR struct inode *blkdriver, FAR const void *data,
FAR void **handle);
static int binfs_unbind(FAR void *handle, FAR struct inode **blkdriver,
unsigned int flags);
static int binfs_statfs(FAR struct inode *mountpt,
FAR struct statfs *buf);
static int binfs_stat(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct stat *buf);
/****************************************************************************
* Public Data
****************************************************************************/
/* See fs_mount.c -- this structure is explicitly extern'ed there.
* We use the old-fashioned kind of initializers so that this will compile
* with any compiler.
*/
const struct mountpt_operations g_binfs_operations =
{
binfs_open, /* open */
binfs_close, /* close */
binfs_read, /* read */
NULL, /* write */
NULL, /* seek */
binfs_ioctl, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
NULL, /* poll */
NULL, /* sync */
binfs_dup, /* dup */
binfs_fstat, /* fstat */
NULL, /* fchstat */
binfs_opendir, /* opendir */
binfs_closedir, /* closedir */
binfs_readdir, /* readdir */
binfs_rewinddir, /* rewinddir */
binfs_bind, /* bind */
binfs_unbind, /* unbind */
binfs_statfs, /* statfs */
NULL, /* unlink */
NULL, /* mkdir */
NULL, /* rmdir */
NULL, /* rename */
binfs_stat, /* stat */
NULL /* chstat */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: binfs_open
****************************************************************************/
static int binfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
int index;
finfo("Open '%s'\n", relpath);
/* BINFS is read-only. Any attempt to open with any kind of write
* access is not permitted.
*/
if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
{
ferr("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* Check if the entry exists with this name in the root directory.
* so the 'relpath' must be the name of the builtin function.
*/
index = builtin_isavail(relpath);
if (index < 0)
{
ferr("ERROR: Built-in %s does not exist\n", relpath);
return -ENOENT;
}
/* Save the index as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)((uintptr_t)index);
return OK;
}
/****************************************************************************
* Name: binfs_close
****************************************************************************/
static int binfs_close(FAR struct file *filep)
{
finfo("Closing\n");
return OK;
}
/****************************************************************************
* Name: binfs_read
****************************************************************************/
static ssize_t binfs_read(FAR struct file *filep,
FAR char *buffer, size_t buflen)
{
/* Reading is not supported. Just return end-of-file */
finfo("Read %zu bytes from offset %jd\n",
buflen, (intmax_t)filep->f_pos);
return 0;
}
/****************************************************************************
* Name: binfs_ioctl
****************************************************************************/
static int binfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
int ret;
finfo("cmd: %d arg: %08lx\n", cmd, arg);
/* Only one IOCTL command is supported */
if (cmd == FIOC_FILEPATH)
{
/* IN: FAR char *(length >= PATH_MAX)
* OUT: The full file path
*/
FAR char *ptr = (FAR char *)((uintptr_t)arg);
if (ptr == NULL)
{
ret = -EINVAL;
}
else
{
ret = inode_getpath(filep->f_inode, ptr, PATH_MAX);
if (ret < 0)
{
return ret;
}
strlcat(ptr, builtin_getname((int)((uintptr_t)filep->f_priv)),
PATH_MAX);
}
}
else
{
ret = -ENOTTY;
}
return ret;
}
/****************************************************************************
* Name: binfs_dup
*
* Description:
* Duplicate open file data in the new file structure.
*
****************************************************************************/
static int binfs_dup(FAR const struct file *oldp, FAR struct file *newp)
{
finfo("Dup %p->%p\n", oldp, newp);
/* Copy the index from the old to the new file structure */
newp->f_priv = oldp->f_priv;
return OK;
}
/****************************************************************************
* Name: binfs_fstat
*
* Description:
* Obtain information about an open file associated with the file
* descriptor 'fd', and will write it to the area pointed to by 'buf'.
*
****************************************************************************/
static int binfs_fstat(FAR const struct file *filep, FAR struct stat *buf)
{
DEBUGASSERT(buf != NULL);
/* It's a execute-only file system */
buf->st_mode = S_IFREG | S_IXOTH | S_IXGRP | S_IXUSR;
buf->st_size = 0;
buf->st_blksize = 0;
buf->st_blocks = 0;
return OK;
}
/****************************************************************************
* Name: binfs_opendir
*
* Description:
* Open a directory for read access
*
****************************************************************************/
static int binfs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct fs_dirent_s **dir)
{
FAR struct binfs_dir_s *bdir;
finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
/* The requested directory must be the volume-relative "root" directory */
if (relpath && relpath[0] != '\0')
{
return -ENOENT;
}
bdir = kmm_zalloc(sizeof(*bdir));
if (bdir == NULL)
{
return -ENOMEM;
}
/* Set the index to the first entry */
bdir->index = 0;
*dir = (FAR struct fs_dirent_s *)bdir;
return OK;
}
/****************************************************************************
* Name: binfs_closedir
*
* Description:
* Close a directory
*
****************************************************************************/
static int binfs_closedir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir)
{
DEBUGASSERT(dir);
kmm_free(dir);
return 0;
}
/****************************************************************************
* Name: binfs_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int binfs_readdir(FAR struct inode *mountpt,
FAR struct fs_dirent_s *dir,
FAR struct dirent *entry)
{
FAR struct binfs_dir_s *bdir;
FAR const char *name;
unsigned int index;
int ret;
/* Have we reached the end of the directory */
bdir = (FAR struct binfs_dir_s *)dir;
index = bdir->index;
name = builtin_getname(index);
if (name == NULL)
{
/* We signal the end of the directory by returning the
* special error -ENOENT
*/
finfo("Entry %d: End of directory\n", index);
ret = -ENOENT;
}
else
{
/* Save the filename and file type */
finfo("Entry %d: \"%s\"\n", index, name);
entry->d_type = DTYPE_FILE;
strlcpy(entry->d_name, name, sizeof(entry->d_name));
/* The application list is terminated by an entry with a NULL name.
* Therefore, there is at least one more entry in the list.
*/
index++;
/* Set up the next directory entry offset. NOTE that we could use the
* standard f_pos instead of our own private index.
*/
bdir->index = index;
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: binfs_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int binfs_rewinddir(struct inode *mountpt, struct fs_dirent_s *dir)
{
finfo("Entry\n");
((FAR struct binfs_dir_s *)dir)->index = 0;
return OK;
}
/****************************************************************************
* Name: binfs_bind
*
* Description: This implements a portion of the mount operation. This
* function allocates and initializes the mountpoint private data and
* binds the blockdriver inode to the filesystem private data. The final
* binding of the private data (containing the blockdriver) to the
* mountpoint is performed by mount().
*
****************************************************************************/
static int binfs_bind(FAR struct inode *blkdriver, const void *data,
void **handle)
{
finfo("Entry\n");
return OK;
}
/****************************************************************************
* Name: binfs_unbind
*
* Description: This implements the filesystem portion of the umount
* operation.
*
****************************************************************************/
static int binfs_unbind(FAR void *handle, FAR struct inode **blkdriver,
unsigned int flags)
{
finfo("Entry\n");
return OK;
}
/****************************************************************************
* Name: binfs_statfs
*
* Description: Return filesystem statistics
*
****************************************************************************/
static int binfs_statfs(struct inode *mountpt, struct statfs *buf)
{
finfo("Entry\n");
/* Fill in the statfs info */
buf->f_type = BINFS_MAGIC;
buf->f_bsize = 0;
buf->f_blocks = 0;
buf->f_bfree = 0;
buf->f_bavail = 0;
buf->f_namelen = NAME_MAX;
return OK;
}
/****************************************************************************
* Name: binfs_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int binfs_stat(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct stat *buf)
{
finfo("Entry\n");
int index;
/* The requested directory must be the volume-relative "root" directory */
if (relpath && relpath[0] != '\0')
{
/* Check if there is a file with this name. */
index = builtin_isavail(relpath);
if (index < 0)
{
return -ENOENT;
}
/* It's a execute-only file name */
buf->st_mode = S_IFREG | S_IXOTH | S_IXGRP | S_IXUSR;
#ifdef CONFIG_SCHED_USER_IDENTITY
buf->st_uid = builtin_getuid(index);
buf->st_gid = builtin_getgid(index);
buf->st_mode |= builtin_getmode(index);
#endif
}
else
{
/* It's a read/execute-only directory name */
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR | S_IXOTH |
S_IXGRP | S_IXUSR;
}
/* File/directory size, access block size */
buf->st_size = 0;
buf->st_blksize = 0;
buf->st_blocks = 0;
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_BINFS */
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