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losetup: implement -c

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function                                             old     new   delta
losetup_main                                         422     449     +27
packed_usage                                       33243   33264     +21
get_next_block                                      1677    1681      +4
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(add/remove: 0/0 grow/shrink: 3/0 up/down: 52/0)               Total: 52 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-05-23 16:11:42 +02:00
parent 1115e40c88
commit 309f5e3775
1 changed files with 22 additions and 10 deletions
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32
util-linux/losetup.c
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@ -20,10 +20,11 @@
//kbuild:lib-$(CONFIG_LOSETUP) += losetup.o //kbuild:lib-$(CONFIG_LOSETUP) += losetup.o
//usage:#define losetup_trivial_usage //usage:#define losetup_trivial_usage
//usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE - associate loop devices\n" //usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE: associate loop devices\n"
//usage: " losetup -d LOOPDEV - disassociate\n" //usage: " losetup -c LOOPDEV: reread file size\n"
//usage: " losetup -a - show status\n" //usage: " losetup -d LOOPDEV: disassociate\n"
//usage: " losetup -f - show next free loop device" //usage: " losetup -a: show status\n"
//usage: " losetup -f: show next free loop device"
//usage:#define losetup_full_usage "\n\n" //usage:#define losetup_full_usage "\n\n"
//usage: " -o OFS Start OFS bytes into FILE" //usage: " -o OFS Start OFS bytes into FILE"
//usage: "\n -r Read-only" //usage: "\n -r Read-only"
@ -50,14 +51,15 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
char *opt_o; char *opt_o;
char dev[LOOP_NAMESIZE]; char dev[LOOP_NAMESIZE];
enum { enum {
OPT_d = (1 << 0), OPT_c = (1 << 0),
OPT_o = (1 << 1), OPT_d = (1 << 1),
OPT_f = (1 << 2), OPT_o = (1 << 2),
OPT_a = (1 << 3), OPT_f = (1 << 3),
OPT_r = (1 << 4), /* must be last */ 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; argv += optind;
/* LOOPDEV */ /* LOOPDEV */
@ -73,6 +75,16 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
return EXIT_SUCCESS; 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 */ /* -d LOOPDEV */
if (opt == OPT_d && argv[0]) { if (opt == OPT_d && argv[0]) {
if (del_loop(argv[0])) if (del_loop(argv[0]))