mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 10:11:27 +01:00
Keir Fraser
ffd4db9a68
Remove all the magic surrounding the special Xen devices in Linux specific code whereby we attempt to figure out what the correct major:minor number is and check the the existing device has these numbers etc. In 2010 we really should be able to trust that the platform has created the devices correctly or provide correct configuration settings such that they are without resorting to tearing down the platform configured state and rebuilding it. tools/hotplug/Linux/xen-backend.rules already contains the necessary udev rules to create /dev/xen/evtchn and friends in the correct place. Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include "tapdisk.h"
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#include "blktaplib.h"
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#include "blktapctrl.h"
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static void make_blktap_dev(char *devname, int major, int minor)
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{
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struct stat st;
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if (lstat(devname, &st) != 0) {
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/*Need to create device*/
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if (mkdir(BLKTAP_DEV_DIR, 0755) == 0)
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DPRINTF("Created %s directory\n",BLKTAP_DEV_DIR);
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if (mknod(devname, S_IFCHR|0600,
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makedev(major, minor)) == 0)
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DPRINTF("Created %s device\n",devname);
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} else {
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DPRINTF("%s device already exists\n",devname);
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/* it already exists, but is it the same major number */
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if (((st.st_rdev>>8) & 0xff) != major) {
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DPRINTF("%s has old major %d\n",
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devname,
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(unsigned int)((st.st_rdev >> 8) & 0xff));
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/* only try again if we succed in deleting it */
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if (!unlink(devname))
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make_blktap_dev(devname, major, minor);
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}
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}
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}
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int blktap_interface_create(int ctlfd, int *major, int *minor, blkif_t *blkif)
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{
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domid_translate_t tr;
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domid_translate_ext_t tr_ext;
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int ret;
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char *devname;
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if (blkif->be_id >= (1<<28)) {
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/* new-style backend-id, so use the extended structure */
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tr_ext.domid = blkif->domid;
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tr_ext.busid = blkif->be_id;
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ret = ioctl(ctlfd, BLKTAP_IOCTL_NEWINTF_EXT, &tr_ext);
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DPRINTF("Sent domid %d and be_id %d\n", tr_ext.domid,
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tr_ext.busid);
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}
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else {
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/* old-style backend-id; use the old structure */
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tr.domid = blkif->domid;
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tr.busid = (unsigned short)blkif->be_id;
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ret = ioctl(ctlfd, BLKTAP_IOCTL_NEWINTF, tr);
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DPRINTF("Sent domid %d and be_id %d\n", tr.domid, tr.busid);
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}
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if ( (ret <= 0)||(ret > MAX_TAP_DEV) ) {
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DPRINTF("Incorrect Dev ID [%d]\n",ret);
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return -1;
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}
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*minor = ret;
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*major = ioctl(ctlfd, BLKTAP_IOCTL_MAJOR, ret );
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if (*major < 0) {
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DPRINTF("Incorrect Major ID [%d]\n",*major);
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return -1;
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}
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if (asprintf(&devname,"%s/%s%d",BLKTAP_DEV_DIR, BLKTAP_DEV_NAME, *minor) == -1)
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return -1;
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make_blktap_dev(devname,*major,*minor);
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DPRINTF("Received device id %d and major %d\n",
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*minor, *major);
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return 0;
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}
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int blktap_interface_open(void)
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{
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int ctlfd;
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ctlfd = open(BLKTAP_DEV_DIR "/" BLKTAP_DEV_NAME "0", O_RDWR);
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if (ctlfd == -1)
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DPRINTF("blktap0 open failed\n");
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return ctlfd;
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}
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