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71 lines
1.9 KiB
71 lines
1.9 KiB
/* blockdev.c -show/set blockdev information.
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*
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* Copyright 2014 Sameer Prakash Pradhan <sameer.p.pradhan@gmail.com>
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*
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* No Standard.
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USE_BLOCKDEV(NEWTOY(blockdev, "<1>1(setro)(setrw)(getro)(getss)(getbsz)(setbsz)#<0(getsz)(getsize)(getsize64)(getra)(setra)#<0(flushbufs)(rereadpt)",TOYFLAG_SBIN))
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config BLOCKDEV
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bool "blockdev"
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default y
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help
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usage: blockdev --OPTION... BLOCKDEV...
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Call ioctl(s) on each listed block device
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--setro Set read only
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--setrw Set read write
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--getro Get read only
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--getss Get sector size
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--getbsz Get block size
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--setbsz BYTES Set block size
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--getsz Get device size in 512-byte sectors
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--getsize Get device size in sectors (deprecated)
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--getsize64 Get device size in bytes
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--getra Get readahead in 512-byte sectors
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--setra SECTORS Set readahead
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--flushbufs Flush buffers
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--rereadpt Reread partition table
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*/
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#define FOR_blockdev
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#include "toys.h"
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#include <linux/fs.h>
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GLOBALS(
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long setbsz, setra;
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)
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void blockdev_main(void)
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{
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int cmds[] = {BLKRRPART, BLKFLSBUF, BLKRASET, BLKRAGET, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64,
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BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET};
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char **ss;
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long long val = 0;
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if (!toys.optflags) help_exit("need --option");
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for (ss = toys.optargs; *ss; ss++) {
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int fd = xopenro(*ss), i;
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// Command line order discarded so perform multiple operations in flag order
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for (i = 0; i < 32; i++) {
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long flag = toys.optflags & (1<<i);
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if (!flag) continue;
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if (flag & FLAG_setbsz) val = TT.setbsz;
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else val = !!(flag & FLAG_setro);
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if (flag & FLAG_setra) val = TT.setra;
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xioctl(fd, cmds[i], &val);
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flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw|FLAG_setbsz;
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if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val);
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}
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xclose(fd);
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}
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}
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