objfs_root.c revision 3898:c788126f2a20 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28
29#include <fs/fs_subr.h>
30
31#include <sys/errno.h>
32#include <sys/kmem.h>
33#include <sys/modctl.h>
34#include <sys/objfs.h>
35#include <sys/objfs_impl.h>
36#include <sys/vfs_opreg.h>
37#include <sys/systm.h>
38
39extern int last_module_id;
40
41static int objfs_root_do_lookup(vnode_t *, const char *, vnode_t **, ino64_t *);
42static int objfs_root_do_readdir(vnode_t *, struct dirent64 *, int *,
43    offset_t *, offset_t *, void *);
44
45vnode_t *
46objfs_create_root(vfs_t *vfsp)
47{
48	vnode_t *vp = gfs_root_create(sizeof (objfs_rootnode_t), vfsp,
49	    objfs_ops_root, OBJFS_INO_ROOT, NULL, NULL, OBJFS_NAME_MAX,
50	    objfs_root_do_readdir, objfs_root_do_lookup);
51
52	return (vp);
53}
54
55/* ARGSUSED */
56static int
57objfs_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr)
58{
59	vap->va_type = VDIR;
60	vap->va_mode = 0555;
61	vap->va_nodeid = gfs_file_inode(vp);
62	vap->va_nlink = objfs_nobjs() + 2;
63	vap->va_size = vap->va_nlink;
64	vap->va_atime.tv_sec = vp->v_vfsp->vfs_mtime;
65	vap->va_atime.tv_nsec = 0;
66	vap->va_mtime = vap->va_ctime = vap->va_atime;
67	return (objfs_common_getattr(vp, vap));
68}
69
70static int
71objfs_root_do_lookup(vnode_t *vp, const char *nm, vnode_t **vpp, ino64_t *inop)
72{
73	int result = ENOENT;
74	struct modctl *mp;
75
76	/*
77	 * Run through all the loaded modules on the system looking for
78	 * a matching module name.
79	 */
80	mutex_enter(&mod_lock);
81	mp = &modules;
82	do {
83		if (mp->mod_loaded &&
84		    strcmp(nm, mp->mod_modname) == 0) {
85			/*
86			 * We drop mod_lock in order to do allocations,
87			 * as modctls are persistent.
88			 */
89			mutex_exit(&mod_lock);
90			*vpp = objfs_create_odirnode(vp, mp);
91			*inop = OBJFS_INO_ODIR(mp->mod_id);
92			mutex_enter(&mod_lock);
93			result = 0;
94			break;
95		}
96	} while ((mp = mp->mod_next) != &modules);
97	mutex_exit(&mod_lock);
98
99	return (result);
100}
101
102/* ARGSUSED */
103int
104objfs_root_do_readdir(vnode_t *vp, struct dirent64 *dp, int *eofp,
105    offset_t *offp, offset_t *nextp, void *data)
106{
107	struct modctl **mpp = data;
108	struct modctl *mp = *mpp;
109
110	mutex_enter(&mod_lock);
111
112	/* Check for EOF */
113	if (*offp >= last_module_id) {
114		*eofp = 1;
115		mutex_exit(&mod_lock);
116		return (0);
117	}
118
119	/*
120	 * Find the appropriate modctl
121	 */
122	while (mp->mod_id < *offp) {
123		mp = mp->mod_next;
124		ASSERT(mp != &modules);
125	}
126
127	while (!mp->mod_loaded && mp != &modules)
128		mp = mp->mod_next;
129
130	if (mp == &modules && *offp != 0) {
131		*eofp = 1;
132		mutex_exit(&mod_lock);
133		return (0);
134	}
135
136	/*
137	 * The modctl will not change, as they are persistent.
138	 */
139	mutex_exit(&mod_lock);
140
141	(void) strncpy(dp->d_name, mp->mod_modname, OBJFS_NAME_MAX);
142	dp->d_ino = OBJFS_INO_ODIR(mp->mod_id);
143	*offp = mp->mod_id;
144	*nextp = mp->mod_id + 1;
145
146	return (0);
147}
148
149/* ARGSUSED */
150static int
151objfs_root_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp)
152{
153	struct modctl *mp = &modules;
154
155	return (gfs_dir_readdir(vp, uiop, eofp, &mp));
156}
157
158const fs_operation_def_t objfs_tops_root[] = {
159	{ VOPNAME_OPEN,		{ .vop_open = objfs_dir_open } },
160	{ VOPNAME_CLOSE,	{ .vop_close = objfs_common_close } },
161	{ VOPNAME_IOCTL,	{ .error = fs_inval } },
162	{ VOPNAME_GETATTR,	{ .vop_getattr = objfs_root_getattr } },
163	{ VOPNAME_ACCESS,	{ .vop_access = objfs_dir_access } },
164	{ VOPNAME_READDIR,	{ .vop_readdir = objfs_root_readdir } },
165	{ VOPNAME_LOOKUP,	{ .vop_lookup = gfs_vop_lookup } },
166	{ VOPNAME_SEEK,		{ .vop_seek = fs_seek } },
167	{ VOPNAME_INACTIVE,	{ .vop_inactive = gfs_vop_inactive } },
168	{ NULL }
169};
170