evin/ms-nfs41-client
3
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

driver: make mount upcalls for shared mounts

Browse source 
even if CreateVNetRoot() finds an existing compatible mount, make a MOUNT upcall and pass that session to the daemon.  the daemon can avoid creating a new root/client/seession, but still has a chance to verify the mount path with LOOKUPs and fetch fs attributes for the new VNetRoot

when the daemon is given an existing root, handle_mount() avoids any extra reference counting on it.  while we can make multiple MOUNT upcalls on a shared mount, we'll still only send the one UNMOUNT upcall on FinalizeNetRoot()

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2012-05-04 11:32:31 -04:00 • committed by unknown
parent b48871d807
commit f6e02ff4a0
2 changed files with 37 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

35
daemon/mount.c
View file

@ -69,17 +69,24 @@ static int handle_mount(nfs41_upcall *upcall)
eprintf("nfs41_server_resolve() failed with %d\n", status);
goto out;
}
// create root
status = nfs41_root_create(args->hostname, args->sec_flavor,
args->wsize + WRITE_OVERHEAD, args->rsize + READ_OVERHEAD, &root);
if (status) {
eprintf("nfs41_root_create() failed %d\n", status);
goto out;
}
// add a mount
root->uid = upcall->uid;
root->gid = upcall->gid;
if (upcall->root_ref != INVALID_HANDLE_VALUE) {
/* use an existing root from a previous mount, but don't take an
* extra reference; we'll only get one UNMOUNT upcall for each root */
root = upcall->root_ref;
} else {
// create root
status = nfs41_root_create(args->hostname, args->sec_flavor,
args->wsize + WRITE_OVERHEAD, args->rsize + READ_OVERHEAD, &root);
if (status) {
eprintf("nfs41_root_create() failed %d\n", status);
goto out;
}
root->uid = upcall->uid;
root->gid = upcall->gid;
}
// find or create the client/session
status = nfs41_root_mount_addrs(root, &addrs, 0, 0, &client);
if (status) {
eprintf("nfs41_root_mount_addrs() failed with %d\n", status);
@ -89,7 +96,7 @@ static int handle_mount(nfs41_upcall *upcall)
// make a copy of the path for nfs41_lookup()
InitializeSRWLock(&path.lock);
if (FAILED(StringCchCopyA(path.path, NFS41_MAX_PATH_LEN, args->path))) {
status = ERROR_BUFFER_OVERFLOW;
status = ERROR_FILENAME_EXCED_RANGE;
goto out_err;
}
path.len = (unsigned short)strlen(path.path);
@ -105,14 +112,16 @@ static int handle_mount(nfs41_upcall *upcall)
nfs41_superblock_fs_attributes(file.fh.superblock, &args->FsAttrs);
if (upcall->root_ref == INVALID_HANDLE_VALUE)
nfs41_root_ref(root);
upcall->root_ref = root;
nfs41_root_ref(upcall->root_ref);
args->lease_time = client->session->lease_time;
out:
return status;
out_err:
nfs41_root_deref(root);
if (upcall->root_ref == INVALID_HANDLE_VALUE)
nfs41_root_deref(root);
goto out;
}