b5e5b06d8b
This patch adds an automount command which makes it possible to execute a script when a certain directory is first accessed. It's the commands responsibility to make this directory available (bringing devices up and mounting it). This results in automount support which makes sure that from the shell every file can be accessed without having to care for device bringup. Bringing up devices may be expensive (USB, dhcp). The automount support makes it easy for the environment to bringup devices when they are actually needed. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
168 lines
4.9 KiB
C
168 lines
4.9 KiB
C
#ifndef __FS_H
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#define __FS_H
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#include <driver.h>
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#define PATH_MAX 1024 /* include/linux/limits.h */
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struct partition;
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struct node_d;
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struct stat;
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struct dirent {
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char d_name[256];
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};
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typedef struct dir {
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struct device_d *dev;
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struct fs_driver_d *fsdrv;
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struct node_d *node;
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struct dirent d;
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void *priv; /* private data for the fs driver */
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} DIR;
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typedef struct filep {
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struct device_d *dev; /* The device this FILE belongs to */
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ulong pos; /* current position in stream */
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ulong size; /* The size of this inode */
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ulong flags; /* the O_* flags from open */
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void *inode; /* private to the filesystem driver */
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/* private fields. Mapping between FILE and filedescriptor number */
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int no;
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char in_use;
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} FILE;
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#define FS_DRIVER_NO_DEV 1
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struct fs_driver_d {
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char *name;
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int (*probe) (struct device_d *dev);
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int (*mkdir)(struct device_d *dev, const char *pathname);
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int (*rmdir)(struct device_d *dev, const char *pathname);
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/* create a file. The file is guaranteed to not exist */
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int (*create)(struct device_d *dev, const char *pathname, mode_t mode);
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int (*unlink)(struct device_d *dev, const char *pathname);
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/* Truncate a file to given size */
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int (*truncate)(struct device_d *dev, FILE *f, ulong size);
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int (*open)(struct device_d *dev, FILE *f, const char *pathname);
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int (*close)(struct device_d *dev, FILE *f);
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int (*read)(struct device_d *dev, FILE *f, void *buf, size_t size);
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int (*write)(struct device_d *dev, FILE *f, const void *buf, size_t size);
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int (*flush)(struct device_d *dev, FILE *f);
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off_t (*lseek)(struct device_d *dev, FILE *f, off_t pos);
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struct dir* (*opendir)(struct device_d *dev, const char *pathname);
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struct dirent* (*readdir)(struct device_d *dev, struct dir *dir);
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int (*closedir)(struct device_d *dev, DIR *dir);
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int (*stat)(struct device_d *dev, const char *file, struct stat *stat);
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int (*ioctl)(struct device_d *dev, FILE *f, int request, void *buf);
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int (*erase)(struct device_d *dev, FILE *f, size_t count,
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unsigned long offset);
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int (*protect)(struct device_d *dev, FILE *f, size_t count,
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unsigned long offset, int prot);
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int (*memmap)(struct device_d *dev, FILE *f, void **map, int flags);
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struct driver_d drv;
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unsigned long flags;
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};
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#define dev_to_fs_driver(d) container_of(d->driver, struct fs_driver_d, drv)
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#define dev_to_fs_device(d) container_of(d, struct fs_device_d, dev)
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extern struct list_head fs_device_list;
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#define for_each_fs_device(f) list_for_each_entry(f, &fs_device_list, list)
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struct fs_device_d {
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char *backingstore; /* the device we are associated with */
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struct device_d dev; /* our own device */
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struct fs_driver_d *driver;
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struct cdev *cdev;
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char *path;
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struct device_d *parent_device;
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struct list_head list;
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};
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/*
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* standard posix file functions
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*/
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int open(const char *pathname, int flags, ...);
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int creat(const char *pathname, mode_t mode);
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int unlink(const char *pathname);
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int close(int fd);
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int flush(int fd);
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int stat(const char *filename, struct stat *s);
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int read(int fd, void *buf, size_t count);
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int ioctl(int fd, int request, void *buf);
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ssize_t write(int fd, const void *buf, size_t count);
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#define SEEK_SET 1
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#define SEEK_CUR 2
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#define SEEK_END 3
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off_t lseek(int fildes, off_t offset, int whence);
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int mkdir (const char *pathname, mode_t mode);
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/* Create a directory and its parents */
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int make_directory(const char *pathname);
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int rmdir (const char *pathname);
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const char *getcwd(void);
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int chdir(const char *pathname);
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DIR *opendir(const char *pathname);
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struct dirent *readdir(DIR *dir);
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int closedir(DIR *dir);
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int mount (const char *device, const char *fsname, const char *path);
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int umount(const char *pathname);
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/* not-so-standard functions */
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int erase(int fd, size_t count, unsigned long offset);
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int protect(int fd, size_t count, unsigned long offset, int prot);
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int protect_file(const char *file, int prot);
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void *memmap(int fd, int flags);
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#define PROT_READ 1
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#define PROT_WRITE 2
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#define LS_RECURSIVE 1
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#define LS_SHOWARG 2
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#define LS_COLUMN 4
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int ls(const char *path, ulong flags);
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char *mkmodestr(unsigned long mode, char *str);
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/*
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* Read a file into memory. Memory is allocated with malloc and must
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* be freed with free() afterwards. This function allocates one
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* byte more than actually needed and sets this to zero, so that
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* it can be used for text files.
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* If size is nonzero it s set to the file size.
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*/
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void *read_file(const char *filename, size_t *size);
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/*
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* This function turns 'path' into an absolute path and removes all occurrences
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* of "..", "." and double slashes. The returned string must be freed wit free().
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*/
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char *normalise_path(const char *path);
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/* Register a new filesystem driver */
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int register_fs_driver(struct fs_driver_d *fsdrv);
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void automount_remove(const char *_path);
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int automount_add(const char *path, const char *cmd);
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void automount_print(void);
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#endif /* __FS_H */
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