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Diffstat (limited to 'nuttx/fs/binfs/fs_binfs.c')
| -rw-r--r-- | nuttx/fs/binfs/fs_binfs.c | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/nuttx/fs/binfs/fs_binfs.c b/nuttx/fs/binfs/fs_binfs.c new file mode 100644 index 000000000..ed6326eba --- /dev/null +++ b/nuttx/fs/binfs/fs_binfs.c @@ -0,0 +1,446 @@ +/**************************************************************************** + * fs/binfs/fs_binfs.c + * + * Copyright (C) 2011-2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source 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/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/binfs.h> +#include <nuttx/fs/dirent.h> +#include <nuttx/fs/ioctl.h> +#include <nuttx/binfmt/builtin.h> + +#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_BINFS) + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int binfs_open(FAR struct file *filep, 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, 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_opendir(struct inode *mountpt, const char *relpath, + struct fs_dirent_s *dir); +static int binfs_readdir(FAR struct inode *mountpt, + FAR struct fs_dirent_s *dir); +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); +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); + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/* See fs_mount.c -- this structure is explicitly externed there. + * We use the old-fashioned kind of initializers so that this will compile + * with any compiler. + */ + +const struct mountpt_operations binfs_operations = +{ + binfs_open, /* open */ + binfs_close, /* close */ + binfs_read, /* read */ + NULL, /* write */ + NULL, /* seek */ + binfs_ioctl, /* ioctl */ + + NULL, /* sync */ + binfs_dup, /* dup */ + + binfs_opendir, /* opendir */ + NULL, /* 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 */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: binfs_open + ****************************************************************************/ + +static int binfs_open(FAR struct file *filep, FAR const char *relpath, + int oflags, mode_t mode) +{ + int index; + + fvdbg("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) + { + fdbg("ERROR: Only O_RDONLY supported\n"); + return -EACCES; + } + + /* Check if the an 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) + { + fdbg("ERROR: Builting %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 *)index; + return OK; +} + +/**************************************************************************** + * Name: binfs_close + ****************************************************************************/ + +static int binfs_close(FAR struct file *filep) +{ + fvdbg("Closing\n"); + return OK; +} + +/**************************************************************************** + * Name: binfs_read + ****************************************************************************/ + +static ssize_t binfs_read(FAR struct file *filep, char *buffer, size_t buflen) +{ + /* Reading is not supported. Just return end-of-file */ + + fvdbg("Read %d bytes from offset %d\n", buflen, filep->f_pos); + return 0; +} + +/**************************************************************************** + * Name: binfs_ioctl + ****************************************************************************/ + +static int binfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg) +{ + int ret; + + fvdbg("cmd: %d arg: %08lx\n", cmd, arg); + + /* Only one IOCTL command is supported */ + + if (cmd == FIOC_FILENAME) + { + /* IN: FAR char const ** pointer + * OUT: Pointer to a persistent file name (Guaranteed to persist while + * the file is open). + */ + + FAR const char **ptr = (FAR const char **)((uintptr_t)arg); + if (ptr == NULL) + { + ret = -EINVAL; + } + else + { + *ptr = g_builtins[(int)filep->f_priv].name; + ret = OK; + } + } + 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) +{ + fvdbg("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_opendir + * + * Description: + * Open a directory for read access + * + ****************************************************************************/ + +static int binfs_opendir(struct inode *mountpt, const char *relpath, + struct fs_dirent_s *dir) +{ + fvdbg("relpath: \"%s\"\n", relpath ? relpath : "NULL"); + + /* The requested directory must be the volume-relative "root" directory */ + + if (relpath && relpath[0] != '\0') + { + return -ENOENT; + } + + /* Set the index to the first entry */ + + dir->u.binfs.fb_index = 0; + return OK; +} + +/**************************************************************************** + * Name: binfs_readdir + * + * Description: Read the next directory entry + * + ****************************************************************************/ + +static int binfs_readdir(struct inode *mountpt, struct fs_dirent_s *dir) +{ + unsigned int index; + int ret; + + /* Have we reached the end of the directory */ + + index = dir->u.binfs.fb_index; + if (g_builtins[index].name == NULL) + { + /* We signal the end of the directory by returning the + * special error -ENOENT + */ + + fvdbg("Entry %d: End of directory\n", index); + ret = -ENOENT; + } + else + { + /* Save the filename and file type */ + + fvdbg("Entry %d: \"%s\"\n", index, g_builtins[index].name); + dir->fd_dir.d_type = DTYPE_FILE; + strncpy(dir->fd_dir.d_name, g_builtins[index].name, NAME_MAX+1); + + /* 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 fb_index. + */ + + dir->u.binfs.fb_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) +{ + fvdbg("Entry\n"); + + dir->u.binfs.fb_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) +{ + fvdbg("Entry\n"); + return OK; +} + +/**************************************************************************** + * Name: binfs_unbind + * + * Description: This implements the filesystem portion of the umount + * operation. + * + ****************************************************************************/ + +static int binfs_unbind(void *handle, FAR struct inode **blkdriver) +{ + fvdbg("Entry\n"); + return OK; +} + +/**************************************************************************** + * Name: binfs_statfs + * + * Description: Return filesystem statistics + * + ****************************************************************************/ + +static int binfs_statfs(struct inode *mountpt, struct statfs *buf) +{ + fvdbg("Entry\n"); + + /* Fill in the statfs info */ + + memset(buf, 0, sizeof(struct statfs)); + 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(struct inode *mountpt, const char *relpath, struct stat *buf) +{ + fvdbg("Entry\n"); + + /* The requested directory must be the volume-relative "root" directory */ + + if (relpath && relpath[0] != '\0') + { + /* Check if there is a file with this name. */ + + if (builtin_isavail(relpath) < 0) + { + return -ENOENT; + } + + /* It's a execute-only file name */ + + buf->st_mode = S_IFREG|S_IXOTH|S_IXGRP|S_IXUSR; + } + 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 */ + |