include/fs.h

   1 #ifndef __FS_H
   2 #define __FS_H
   3
   4 #include <driver.h>
   5
   6 #define FS_TYPE_CRAMFS 1
   7 #define FS_TYPE_RAMFS  2
   8 #define FS_TYPE_DEVFS  3
   9
  10 #define PATH_MAX       1024        /* include/linux/limits.h */
  11
  12 struct partition;
  13 struct node_d;
  14 struct stat;
  15
  16 struct dirent {
  17         char d_name[256];
  18 };
  19
  20 typedef struct dir {
  21         struct device_d *dev;
  22         struct fs_driver_d *fsdrv;
  23         struct node_d *node;
  24         struct dirent d;
  25         void *priv; /* private data for the fs driver */
  26 } DIR;
  27
  28 typedef struct filep {
  29         struct device_d *dev; /* The device this FILE belongs to              */
  30         ulong pos;            /* current position in stream                   */
  31         ulong size;           /* The size of this inode                       */
  32         ulong flags;          /* the O_* flags from open                      */
  33
  34         void *inode;         /* private to the filesystem driver              */
  35
  36         /* private fields. Mapping between FILE and filedescriptor number     */
  37         int no;
  38         char in_use;
  39 } FILE;
  40
  41 #define FS_DRIVER_NO_DEV        1
  42
  43 struct fs_driver_d {
  44         ulong type;
  45         char *name;
  46         int (*probe) (struct device_d *dev);
  47         int (*mkdir)(struct device_d *dev, const char *pathname);
  48         int (*rmdir)(struct device_d *dev, const char *pathname);
  49
  50         /* create a file. The file is guaranteed to not exist */
  51         int (*create)(struct device_d *dev, const char *pathname, mode_t mode);
  52         int (*unlink)(struct device_d *dev, const char *pathname);
  53
  54         /* Truncate a file to given size */
  55         int (*truncate)(struct device_d *dev, FILE *f, ulong size);
  56
  57         int (*open)(struct device_d *dev, FILE *f, const char *pathname);
  58         int (*close)(struct device_d *dev, FILE *f);
  59         int (*read)(struct device_d *dev, FILE *f, void *buf, size_t size);
  60         int (*write)(struct device_d *dev, FILE *f, const void *buf, size_t size);
  61         off_t (*lseek)(struct device_d *dev, FILE *f, off_t pos);
  62
  63         struct dir* (*opendir)(struct device_d *dev, const char *pathname);
  64         struct dirent* (*readdir)(struct device_d *dev, struct dir *dir);
  65         int (*closedir)(struct device_d *dev, DIR *dir);
  66         int (*stat)(struct device_d *dev, const char *file, struct stat *stat);
  67
  68         int (*ioctl)(struct device_d *dev, FILE *f, int request, void *buf);
  69         int (*erase)(struct device_d *dev, FILE *f, size_t count,
  70                         unsigned long offset);
  71         int (*protect)(struct device_d *dev, FILE *f, size_t count,
  72                         unsigned long offset, int prot);
  73
  74         int (*memmap)(struct device_d *dev, FILE *f, void **map, int flags);
  75
  76         struct driver_d drv;
  77
  78         unsigned long flags;
  79
  80         struct list_head list;
  81 };
  82
  83 struct mtab_entry {
  84         char path[PATH_MAX];
  85         struct mtab_entry *next;
  86         struct device_d *dev;
  87         struct device_d *parent_device;
  88 };
  89
  90 struct fs_device_d {
  91         char *backingstore; /* the device we are associated with */
  92         struct device_d dev; /* our own device */
  93
  94         struct fs_driver_d *driver;
  95
  96         struct mtab_entry mtab;
  97 };
  98
  99 /*
 100  * standard posix file functions
 101  */
 102 int open(const char *pathname, int flags, ...);
 103 int creat(const char *pathname, mode_t mode);
 104 int unlink(const char *pathname);
 105 int close(int fd);
 106 int stat(const char *filename, struct stat *s);
 107 int read(int fd, void *buf, size_t count);
 108 int ioctl(int fd, int request, void *buf);
 109 ssize_t write(int fd, const void *buf, size_t count);
 110
 111 #define SEEK_SET        1
 112 #define SEEK_CUR        2
 113 #define SEEK_END        3
 114
 115 off_t lseek(int fildes, off_t offset, int whence);
 116 int mkdir (const char *pathname, mode_t mode);
 117
 118 /* Create a directory and its parents */
 119 int make_directory(const char *pathname);
 120 int rmdir (const char *pathname);
 121
 122 const char *getcwd(void);
 123 int chdir(const char *pathname);
 124
 125 DIR *opendir(const char *pathname);
 126 struct dirent *readdir(DIR *dir);
 127 int closedir(DIR *dir);
 128
 129 int mount (const char *device, const char *fsname, const char *path);
 130 int umount(const char *pathname);
 131
 132 /* not-so-standard functions */
 133 int erase(int fd, size_t count, unsigned long offset);
 134 int protect(int fd, size_t count, unsigned long offset, int prot);
 135 void *memmap(int fd, int flags);
 136
 137 #define PROT_READ       1
 138 #define PROT_WRITE      2
 139
 140 #define LS_RECURSIVE    1
 141 #define LS_SHOWARG      2
 142 #define LS_COLUMN       4
 143 int ls(const char *path, ulong flags);
 144
 145 char *mkmodestr(unsigned long mode, char *str);
 146
 147 /*
 148  * Information about mounted devices.
 149  * Note that we only support mounting on directories lying
 150  * directly in / and of course the root directory itself
 151  */
 152 struct mtab_entry *get_mtab_entry_by_path(const char *path);
 153 struct mtab_entry *mtab_next_entry(struct mtab_entry *entry);
 154 const char *fsdev_get_mountpoint(struct fs_device_d *fsdev);
 155
 156 /*
 157  * Read a file into memory. Memory is allocated with malloc and must
 158  * be freed with free() afterwards. This function allocates one
 159  * byte more than actually needed and sets this to zero, so that
 160  * it can be used for text files.
 161  * If size is nonzero it s set to the file size.
 162  */
 163 void *read_file(const char *filename, size_t *size);
 164
 165 /*
 166  * This function turns 'path' into an absolute path and removes all occurrences
 167  * of "..", "." and double slashes. The returned string must be freed wit free().
 168  */
 169 char *normalise_path(const char *path);
 170
 171 /* Register a new filesystem driver */
 172 int register_fs_driver(struct fs_driver_d *fsdrv);
 173
 174 #endif /* __FS_H */