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annotate toys/other/blockdev.c @ 1776:7bf68329eb3b draft default tip

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Repository switched to git at https://github.com/landley/toybox
author Rob Landley <rob@landley.net>
date Thu, 09 Apr 2015 02:28:32 -0500
parents 8b7ddefcf28c
children
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08a34594b2c6 A toy _BLOCKDEV_ to get/set block device properties.
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1 /* blockdev.c -show/set blockdev information.
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2 *
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3 * Copyright 2014 Sameer Prakash Pradhan <sameer.p.pradhan@gmail.com>
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4 *
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5 * No Standard.
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6
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7 USE_BLOCKDEV(NEWTOY(blockdev, "<1>1(setro)(setrw)(getro)(getss)(getbsz)(setbsz)#<0(getsz)(getsize)(getsize64)(flushbufs)(rereadpt)",TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config BLOCKDEV
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10 bool "blockdev"
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11 default y
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12 help
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13 usage: blockdev --OPTION... BLOCKDEV...
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14
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15 Call ioctl(s) on each listed block device
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16
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17 OPTIONs:
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18 --setro Set read only
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19 --setrw Set read write
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20 --getro Get read only
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21 --getss Get sector size
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22 --getbsz Get block size
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23 --setbsz BYTES Set block size
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24 --getsz Get device size in 512-byte sectors
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25 --getsize Get device size in sectors (deprecated)
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26 --getsize64 Get device size in bytes
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27 --flushbufs Flush buffers
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28 --rereadpt Reread partition table
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29 */
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30
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31 #define FOR_blockdev
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32 #include "toys.h"
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33 #include <linux/fs.h>
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34
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35 GLOBALS(
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36 long bsz;
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37 )
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38
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39 void blockdev_main(void)
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40 {
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41 int cmds[] = {BLKRRPART, BLKFLSBUF, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64,
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42 BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET};
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43 char **ss;
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44 long long val = 0;
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45
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46 if (!toys.optflags) {
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47 toys.exithelp = 1;
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48 error_exit("need --option");
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49 }
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50
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51 for (ss = toys.optargs; *ss; ss++) {
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52 int fd = xopen(*ss, O_RDONLY), i;
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53
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54 // Command line order discarded so perform multiple operations in flag order
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55 for (i = 0; i < 32; i++) {
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56 long flag = toys.optflags & (1<<i);
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57
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58 if (!flag) continue;
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59
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60 if (flag & FLAG_setbsz) val = TT.bsz;
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61 else val = !!(flag & FLAG_setro);
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62
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63 xioctl(fd, cmds[i], &val);
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64
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65 flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw;
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66 if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val);
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67 }
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68 xclose(fd);
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69 }
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70 }