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47 lines
1.3 KiB
47 lines
1.3 KiB
7 years ago
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---
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kpartx/lopart.c | 18 ++++++++++++++++--
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1 file changed, 16 insertions(+), 2 deletions(-)
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Index: multipath-tools-130222/kpartx/lopart.c
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===================================================================
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--- multipath-tools-130222.orig/kpartx/lopart.c
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+++ multipath-tools-130222/kpartx/lopart.c
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@@ -32,6 +32,10 @@
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#include "lopart.h"
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#include "xstrncpy.h"
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+#ifndef LOOP_CTL_GET_FREE
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+#define LOOP_CTL_GET_FREE 0x4C82
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+#endif
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+
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#if !defined (__alpha__) && !defined (__ia64__) && !defined (__x86_64__) \
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&& !defined (__s390x__)
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#define int2ptr(x) ((void *) ((int) x))
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@@ -140,14 +144,24 @@ find_unused_loop_device (void)
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char dev[20];
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char *loop_formats[] = { "/dev/loop%d", "/dev/loop/%d" };
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- int i, j, fd, somedev = 0, someloop = 0, loop_known = 0;
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+ int i, j, fd, first = 0, somedev = 0, someloop = 0, loop_known = 0;
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struct stat statbuf;
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struct loop_info loopinfo;
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FILE *procdev;
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+ if (stat("/dev/loop-control", &statbuf) == 0 &&
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+ S_ISCHR(statbuf.st_mode)) {
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+ fd = open("/dev/loop-control", O_RDWR);
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+ if (fd >= 0) {
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+ first = ioctl(fd, LOOP_CTL_GET_FREE);
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+ close(fd);
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+ }
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+ if (first < 0)
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+ first = 0;
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+ }
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for (j = 0; j < SIZE(loop_formats); j++) {
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- for(i = 0; i < 256; i++) {
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+ for(i = first; i < 256; i++) {
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sprintf(dev, loop_formats[j], i);
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if (stat (dev, &statbuf) == 0 && S_ISBLK(statbuf.st_mode)) {
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