1 /* blockdev.c -show/set blockdev information. 2 * 3 * Copyright 2014 Sameer Prakash Pradhan <sameer.p.pradhan (at) 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 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
