1 /* blockdev.c -show/set blockdev information.
2 *
3 * Copyright 2014 Sameer Prakash Pradhan <sameer.p.pradhan@gmail.com>
4 *
5 * No Standard.
6
7 USE_BLOCKDEV(NEWTOY(blockdev, "<1>1(setro)(setrw)(getro)(getss)(getbsz)(setbsz)#<0(getsz)(getsize)(getsize64)(getra)(setra)#<0(flushbufs)(rereadpt)",TOYFLAG_SBIN))
8
9 config BLOCKDEV
10 bool "blockdev"
11 default y
12 help
13 usage: blockdev --OPTION... BLOCKDEV...
14
15 Call ioctl(s) on each listed block device
16
17 --setro Set read only
18 --setrw Set read write
19 --getro Get read only
20 --getss Get sector size
21 --getbsz Get block size
22 --setbsz BYTES Set block size
23 --getsz Get device size in 512-byte sectors
24 --getsize Get device size in sectors (deprecated)
25 --getsize64 Get device size in bytes
26 --getra Get readahead in 512-byte sectors
27 --setra SECTORS Set readahead
28 --flushbufs Flush buffers
29 --rereadpt Reread partition table
30 */
31
32 #define FOR_blockdev
33 #include "toys.h"
34 #include <linux/fs.h>
35
GLOBALS(long setbsz,setra;)36 GLOBALS(
37 long setbsz, setra;
38 )
39
40 void blockdev_main(void)
41 {
42 int cmds[] = {BLKRRPART, BLKFLSBUF, BLKRASET, BLKRAGET, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64,
43 BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET};
44 char **ss;
45 long long val = 0;
46
47 if (!toys.optflags) help_exit("need --option");
48
49 for (ss = toys.optargs; *ss; ss++) {
50 int fd = xopenro(*ss), i;
51
52 // Command line order discarded so perform multiple operations in flag order
53 for (i = 0; i < 32; i++) {
54 long flag = toys.optflags & (1<<i);
55
56 if (!flag) continue;
57
58 if (flag & FLAG_setbsz) val = TT.setbsz;
59 else val = !!(flag & FLAG_setro);
60
61 if (flag & FLAG_setra) val = TT.setra;
62
63 xioctl(fd, cmds[i], &val);
64
65 flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw|FLAG_setbsz;
66 if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val);
67 }
68 xclose(fd);
69 }
70 }
71