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libbb: if opening /dev/loopN returns ENXIO, don't try N++.

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function                                             old     new   delta
set_loop                                             639     635      -4

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2014-01-21 13:44:21 +01:00
parent 3b394781b5
commit fa6ab56353
1 changed files with 12 additions and 6 deletions
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16
libbb/loop.c
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@ -94,19 +94,19 @@ int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offse
/* Open the file. Barf if this doesn't work. */
mode = ro ? O_RDONLY : O_RDWR;
open_ffd:
ffd = open(file, mode);
if (ffd < 0) {
if (mode != O_RDONLY) {
mode = O_RDONLY;
ffd = open(file, mode);
goto open_ffd;
}
if (ffd < 0)
return -errno;
}
/* Find a loop device. */
try = *device ? *device : dev;
/* 1048575 is a max possible minor number in Linux circa 2010 */
/* 1048575 (0xfffff) is a max possible minor number in Linux circa 2010 */
for (i = 0; rc && i < 1048576; i++) {
sprintf(dev, LOOP_FORMAT, i);
@ -121,7 +121,7 @@ int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offse
goto try_to_open;
}
/* Ran out of block devices, return failure. */
rc = -ENOENT;
rc = -1;
break;
}
try_to_open:
@ -131,8 +131,14 @@ int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offse
mode = O_RDONLY;
dfd = open(try, mode);
}
if (dfd < 0)
if (dfd < 0) {
if (errno == ENXIO) {
/* Happens if loop module is not loaded */
rc = -1;
break;
}
goto try_again;
}
rc = ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo);