309f5e377
Denys Vlasenko
2019-05-23
Subject
losetup: implement -c
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Commit Diff GitHub →
util-linux/losetup.c+22 -10
| @@ -20,10 +20,11 @@ | |
| //kbuild:lib-$(CONFIG_LOSETUP) += losetup.o | |
| //usage:#define losetup_trivial_usage | |
| - | //usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE - associate loop devices\n" |
| - | //usage: " losetup -d LOOPDEV - disassociate\n" |
| - | //usage: " losetup -a - show status\n" |
| - | //usage: " losetup -f - show next free loop device" |
| + | //usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE: associate loop devices\n" |
| + | //usage: " losetup -c LOOPDEV: reread file size\n" |
| + | //usage: " losetup -d LOOPDEV: disassociate\n" |
| + | //usage: " losetup -a: show status\n" |
| + | //usage: " losetup -f: show next free loop device" |
| //usage:#define losetup_full_usage "\n\n" | |
| //usage: " -o OFS Start OFS bytes into FILE" | |
| //usage: "\n -r Read-only" | |
| @@ -50,14 +51,15 @@ int losetup_main(int argc UNUSED_PARAM, char **argv) | |
| char *opt_o; | |
| char dev[LOOP_NAMESIZE]; | |
| enum { | |
| - | OPT_d = (1 << 0), |
| - | OPT_o = (1 << 1), |
| - | OPT_f = (1 << 2), |
| - | OPT_a = (1 << 3), |
| - | OPT_r = (1 << 4), /* must be last */ |
| + | OPT_c = (1 << 0), |
| + | OPT_d = (1 << 1), |
| + | OPT_o = (1 << 2), |
| + | OPT_f = (1 << 3), |
| + | OPT_a = (1 << 4), |
| + | OPT_r = (1 << 5), |
| }; | |
| - | opt = getopt32(argv, "^" "do:far" "\0" "?2:d--ofar:a--ofr", &opt_o); |
| + | opt = getopt32(argv, "^" "cdo:far" "\0" "?2:d--ofar:a--ofr", &opt_o); |
| argv += optind; | |
| /* LOOPDEV */ | |
| @@ -73,6 +75,16 @@ int losetup_main(int argc UNUSED_PARAM, char **argv) | |
| return EXIT_SUCCESS; | |
| } | |
| + | /* -c LOOPDEV */ |
| + | if (opt == OPT_c && argv[0]) { |
| + | int fd = xopen(argv[0], O_RDONLY); |
| + | #ifndef LOOP_SET_CAPACITY |
| + | # define LOOP_SET_CAPACITY 0x4C07 |
| + | #endif |
| + | xioctl(fd, LOOP_SET_CAPACITY, /*ignored:*/0); |
| + | return EXIT_SUCCESS; |
| + | } |
| + | |
| /* -d LOOPDEV */ | |
| if (opt == OPT_d && argv[0]) { | |
| if (del_loop(argv[0])) | |