arch/um/include/ubd_user.h

   1 /*
   2  * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
   3  * Copyright (C) 2001 RidgeRun, Inc (glonnon@ridgerun.com)
   4  * Licensed under the GPL
   5  */
   6
   7 #ifndef __UM_UBD_USER_H
   8 #define __UM_UBD_USER_H
   9
  10 #include "os.h"
  11
  12 enum ubd_req { UBD_READ, UBD_WRITE, UBD_MMAP };
  13
  14 struct io_thread_req {
  15         enum ubd_req op;
  16         int fds[2];
  17         unsigned long offsets[2];
  18         unsigned long long offset;
  19         unsigned long length;
  20         char *buffer;
  21         int sectorsize;
  22         unsigned long sector_mask;
  23         unsigned long long cow_offset;
  24         unsigned long bitmap_words[2];
  25         int map_fd;
  26         unsigned long long map_offset;
  27         int error;
  28 };
  29
  30 extern int open_ubd_file(char *file, struct openflags *openflags,
  31                          char **backing_file_out, int *bitmap_offset_out,
  32                          unsigned long *bitmap_len_out, int *data_offset_out,
  33                          int *create_cow_out);
  34 extern int create_cow_file(char *cow_file, char *backing_file,
  35                            struct openflags flags, int sectorsize,
  36                            int alignment, int *bitmap_offset_out,
  37                            unsigned long *bitmap_len_out,
  38                            int *data_offset_out);
  39 extern int read_cow_bitmap(int fd, void *buf, int offset, int len);
  40 extern int read_ubd_fs(int fd, void *buffer, int len);
  41 extern int write_ubd_fs(int fd, char *buffer, int len);
  42 extern int start_io_thread(unsigned long sp, int *fds_out);
  43 extern void do_io(struct io_thread_req *req);
  44
  45 static inline int ubd_test_bit(__u64 bit, unsigned char *data)
  46 {
  47         __u64 n;
  48         int bits, off;
  49
  50         bits = sizeof(data[0]) * 8;
  51         n = bit / bits;
  52         off = bit % bits;
  53         return((data[n] & (1 << off)) != 0);
  54 }
  55
  56 static inline void ubd_set_bit(__u64 bit, unsigned char *data)
  57 {
  58         __u64 n;
  59         int bits, off;
  60
  61         bits = sizeof(data[0]) * 8;
  62         n = bit / bits;
  63         off = bit % bits;
  64         data[n] |= (1 << off);
  65 }
  66
  67
  68 #endif
  69
  70 /*
  71  * Overrides for Emacs so that we follow Linus's tabbing style.
  72  * Emacs will notice this stuff at the end of the file and automatically
  73  * adjust the settings for this buffer only.  This must remain at the end
  74  * of the file.
  75  * ---------------------------------------------------------------------------
  76  * Local variables:
  77  * c-file-style: "linux"
  78  * End:
  79  */