d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix early kernel dump via dumpdev env

Browse Source 
Setting the dumpdev via env e.g. loader.conf provides the ability to
configure the kernel dump device during early boot. When using this
g_io_getattr was returning EPERM due to cp->acr == 0.

Fix this by calling g_access to ensure we're a read consumer prior
to calling g_dev_setdumpdev.

MFC after:	2 weeks
Sponsored by:	Multiplay
This commit is contained in:
smh 2015-11-17 20:55:50 +00:00
parent 195994e5fb
commit 3de9025c5c
1 changed files with 22 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
sys/geom/geom_dev.c
View File

@ -150,24 +150,38 @@ g_dev_setdumpdev(struct cdev *dev, struct thread *td)
return (error);
}
static void
static int
init_dumpdev(struct cdev *dev)
{
struct g_consumer *cp;
const char *devprefix = "/dev/", *devname;
int error;
size_t len;
if (dumpdev == NULL)
return;
return (0);
len = strlen(devprefix);
devname = devtoname(dev);
if (strcmp(devname, dumpdev) != 0 &&
(strncmp(dumpdev, devprefix, len) != 0 ||
strcmp(devname, dumpdev + len) != 0))
return;
if (g_dev_setdumpdev(dev, curthread) == 0) {
return (0);
cp = (struct g_consumer *)dev->si_drv2;
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
error = g_dev_setdumpdev(dev, curthread);
if (error == 0) {
freeenv(dumpdev);
dumpdev = NULL;
}
(void)g_access(cp, -1, 0, 0);
return (error);
}
static void
@ -312,7 +326,10 @@ g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
dev->si_iosize_max = MAXPHYS;
dev->si_drv2 = cp;
init_dumpdev(dev);
error = init_dumpdev(dev);
if (error != 0)
printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n",
__func__, gp->name, error);
g_dev_attrchanged(cp, "GEOM::physpath");
snprintf(buf, sizeof(buf), "cdev=%s", gp->name);