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In the devfs case, have initproc attempt the easy cases of mounting /dev.

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This works if /dev exists, or if / is read/write (nfsroot).  If it is
too hard, leave it up to init -d (which will probably fail if /dev does
not exist, but there isn't much else we can do short of making a union
mount on /).

This means we get a proper /dev if you boot a 5.x kernel on a 4.x world,
which I happen to do often (the ramdisks on our install netboot servers
have 4.x userland worlds on them).
This commit is contained in:
Peter Wemm 2001-09-15 11:15:22 +00:00
parent 3a0b4f259c
commit b711616825
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=83507
1 changed files with 17 additions and 1 deletions
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18
sys/kern/init_main.c
View file

@ -475,6 +475,7 @@ start_init(void *dummy)
char *ucp, **uap, *arg0, *arg1;
struct thread *td;
struct proc *p;
int init_does_devfs = 0;
mtx_lock(&Giant);
@ -492,6 +493,21 @@ start_init(void *dummy)
VREF(p->p_fd->fd_rdir);
VOP_UNLOCK(rootvnode, 0, td);
if (devfs_present) {
/*
* For disk based systems, we probably cannot do this yet
* since the fs will be read-only. But a NFS root
* might be ok. It is worth a shot.
*/
error = vn_mkdir("/dev", 0700, UIO_SYSSPACE, td);
if (error == EEXIST)
error = 0;
if (error == 0)
error = vfs_mount(td, "devfs", "/dev", 0, 0);
if (error != 0)
init_does_devfs = 1;
}
/*
* Need just enough stack to hold the faked-up "execve()" arguments.
*/
@ -541,7 +557,7 @@ start_init(void *dummy)
(void)subyte(--ucp, 'C');
options = 1;
#endif
if (devfs_present) {
if (init_does_devfs) {
(void)subyte(--ucp, 'd');
options = 1;
}