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)(flushbufs)(rereadpt)",TOYFLAG_USR|TOYFLAG_BIN)) 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 OPTIONs: 18 --setro Set read only 19 --setrw Set read write 20 --getro Get read only 21 --getss Get sector size 22 --getbsz Get block size 23 --setbsz BYTES Set block size 24 --getsz Get device size in 512-byte sectors 25 --getsize Get device size in sectors (deprecated) 26 --getsize64 Get device size in bytes 27 --flushbufs Flush buffers 28 --rereadpt Reread partition table 29 */ 30 31 #define FOR_blockdev 32 #include "toys.h" 33 #include <linux/fs.h> 34 35 GLOBALS( 36 long bsz; 37 ) 38 39 void blockdev_main(void) 40 { 41 int cmds[] = {BLKRRPART, BLKFLSBUF, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64, 42 BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET}; 43 char **ss; 44 long long val = 0; 45 46 if (!toys.optflags) help_exit("need --option"); 47 48 for (ss = toys.optargs; *ss; ss++) { 49 int fd = xopen(*ss, O_RDONLY), i; 50 51 // Command line order discarded so perform multiple operations in flag order 52 for (i = 0; i < 32; i++) { 53 long flag = toys.optflags & (1<<i); 54 55 if (!flag) continue; 56 57 if (flag & FLAG_setbsz) val = TT.bsz; 58 else val = !!(flag & FLAG_setro); 59 60 xioctl(fd, cmds[i], &val); 61 62 flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw; 63 if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val); 64 } 65 xclose(fd); 66 } 67 } 68
