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Diffstat (limited to 'toys')
-rw-r--r--toys/other/losetup.c41
1 files changed, 24 insertions, 17 deletions
diff --git a/toys/other/losetup.c b/toys/other/losetup.c
index d77a9500..02856c27 100644
--- a/toys/other/losetup.c
+++ b/toys/other/losetup.c
@@ -4,7 +4,7 @@
*
* No standard. (Sigh.)
-USE_LOSETUP(NEWTOY(losetup, ">2S(sizelimit)#s(show)ro#j:fdca[!afj]", TOYFLAG_SBIN))
+USE_LOSETUP(NEWTOY(losetup, ">2S(sizelimit)#s(show)ro#j:fdcaD[!afj]", TOYFLAG_SBIN))
config LOSETUP
bool "losetup"
@@ -18,17 +18,18 @@ config LOSETUP
Instead of a device:
-a Iterate through all loopback devices
-f Find first unused loop device (may create one)
- -j Iterate through all loopback devices associated with FILE
+ -j FILE Iterate through all loopback devices associated with FILE
existing:
-c Check capacity (file size changed)
- -d Detach loopback device
+ -d DEV Detach loopback device
+ -D Detach all loopback devices
new:
-s Show device name (alias --show)
- -o Start association at OFFSET into FILE
+ -o OFF Start association at offset OFF into FILE
-r Read only
- -S Limit SIZE of loopback association (alias --sizelimit)
+ -S SIZE Limit SIZE of loopback association (alias --sizelimit)
*/
#define FOR_losetup
@@ -51,7 +52,6 @@ static void loopback_setup(char *device, char *file)
{
struct loop_info64 *loop = (void *)(toybuf+32);
int lfd = -1, ffd = ffd;
- unsigned flags = toys.optflags;
// Open file (ffd) and loop device (lfd)
@@ -78,7 +78,12 @@ static void loopback_setup(char *device, char *file)
// Stat the loop device to see if there's a current association.
memset(loop, 0, sizeof(struct loop_info64));
if (-1 == lfd || ioctl(lfd, LOOP_GET_STATUS64, loop)) {
- if (errno == ENXIO && (flags & (FLAG_a|FLAG_j))) goto done;
+ if (errno == ENXIO && (FLAG(a) || FLAG(j))) goto done;
+ // ENXIO expected if we're just trying to print the first unused device.
+ if (errno == ENXIO && FLAG(f) && !file) {
+ puts(device);
+ goto done;
+ }
if (errno != ENXIO || !file) {
perror_msg_raw(device ? device : "-f");
goto done;
@@ -90,9 +95,9 @@ static void loopback_setup(char *device, char *file)
goto done;
// Check size of file or delete existing association
- if (flags & (FLAG_c|FLAG_d)) {
+ if (FLAG(c) || FLAG(d)) {
// The constant is LOOP_SET_CAPACITY
- if (ioctl(lfd, (flags & FLAG_c) ? 0x4C07 : LOOP_CLR_FD, 0)) {
+ if (ioctl(lfd, FLAG(c) ? 0x4C07 : LOOP_CLR_FD, 0)) {
perror_msg_raw(device);
goto done;
}
@@ -107,11 +112,11 @@ static void loopback_setup(char *device, char *file)
xstrncpy((char *)loop->lo_file_name, s, LO_NAME_SIZE);
s[LO_NAME_SIZE-1] = 0;
if (ioctl(lfd, LOOP_SET_STATUS64, loop)) perror_exit("%s=%s", device, file);
- if (flags & FLAG_s) printf("%s", device);
+ if (FLAG(s)) puts(device);
free(s);
- } else if (flags & FLAG_f) printf("%s", device);
+ }
else {
- xprintf("%s: [%04llx]:%llu (%s)", device, (long long)loop->lo_device,
+ xprintf("%s: [%lld]:%llu (%s)", device, (long long)loop->lo_device,
(long long)loop->lo_inode, loop->lo_file_name);
if (loop->lo_offset) xprintf(", offset %llu",
(unsigned long long)loop->lo_offset);
@@ -145,7 +150,7 @@ void losetup_main(void)
{
char **s;
- TT.openflags = (toys.optflags & FLAG_r) ? O_RDONLY : O_RDWR;
+ TT.openflags = FLAG(r) ? O_RDONLY : O_RDWR;
if (TT.j) {
struct stat st;
@@ -164,17 +169,19 @@ void losetup_main(void)
// -f(dc FILE)
- if (toys.optflags & FLAG_f) {
+ if (FLAG(D)) toys.optflags |= FLAG_a | FLAG_d;
+
+ if (FLAG(f)) {
if (toys.optc > 1) perror_exit("max 1 arg");
loopback_setup(NULL, *toys.optargs);
- } else if (toys.optflags & (FLAG_a|FLAG_j)) {
+ } else if (FLAG(a) || FLAG(j)) {
if (toys.optc) error_exit("bad args");
dirtree_read("/dev", dash_a);
// Do we need one DEVICE argument?
} else {
- char *file = (toys.optflags & (FLAG_d|FLAG_c)) ? NULL : toys.optargs[1];
+ char *file = (FLAG(c) || FLAG(d)) ? NULL : toys.optargs[1];
- if (!toys.optc || (file && toys.optc != 2))
+ if (!toys.optc || (file && toys.optc != 2))
help_exit("needs %d arg%s", 1+!!file, file ? "s" : "");
for (s = toys.optargs; *s; s++) {
loopback_setup(*s, file);