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Use /dev/loop-control if it exists

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Loop devices can be added on the fly when needed, they're
not always created beforehand. The loop-control device can
be used to find and allocate the next available number
instead of going through the /dev directory contents (which
is now only a fallback mechanism).

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2015-07-03 14:10:17 +02:00
parent 814d049da4
commit edd7414a64
1 changed files with 21 additions and 1 deletions
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22
src/lxc/bdev.c
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@ -1868,7 +1868,7 @@ static int loop_detect(const char *path)
return 0;
}
static int find_free_loopdev(int *retfd, char *namep)
static int find_free_loopdev_no_control(int *retfd, char *namep)
{
struct dirent dirent, *direntp;
struct loop_info64 lo;
@ -1908,6 +1908,26 @@ static int find_free_loopdev(int *retfd, char *namep)
return 0;
}
static int find_free_loopdev(int *retfd, char *namep)
{
int rc, fd = -1;
int ctl = open("/dev/loop-control", O_RDWR);
if (ctl < 0)
return find_free_loopdev_no_control(retfd, namep);
rc = ioctl(ctl, LOOP_CTL_GET_FREE);
if (rc >= 0) {
snprintf(namep, 100, "/dev/loop%d", rc);
fd = open(namep, O_RDWR);
}
close(ctl);
if (fd == -1) {
ERROR("No loop device found");
return -1;
}
*retfd = fd;
return 0;
}
static int loop_mount(struct bdev *bdev)
{
int lfd, ffd = -1, ret = -1;