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 2008 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
39 extern int last_module_id;
40
41 static int objfs_root_do_lookup(vnode_t *, const char *, vnode_t **, ino64_t *,
42 cred_t *, int, int *, pathname_t *);
43 static int objfs_root_do_readdir(vnode_t *, void *, int *,
44 offset_t *, offset_t *, void *, int);
45
46 vnode_t *
objfs_create_root(vfs_t * vfsp)47 objfs_create_root(vfs_t *vfsp)
48 {
49 vnode_t *vp = gfs_root_create(sizeof (objfs_rootnode_t), vfsp,
50 objfs_ops_root, OBJFS_INO_ROOT, NULL, NULL, OBJFS_NAME_MAX,
51 objfs_root_do_readdir, objfs_root_do_lookup);
52
53 return (vp);
54 }
55
56 /* ARGSUSED */
57 static int
objfs_root_getattr(vnode_t * vp,vattr_t * vap,int flags,cred_t * cr,caller_context_t * ct)58 objfs_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
59 caller_context_t *ct)
60 {
61 vap->va_type = VDIR;
62 vap->va_mode = 0555;
63 vap->va_nodeid = gfs_file_inode(vp);
64 vap->va_nlink = objfs_nobjs() + 2;
65 vap->va_size = vap->va_nlink;
66 vap->va_atime.tv_sec = vp->v_vfsp->vfs_mtime;
67 vap->va_atime.tv_nsec = 0;
68 vap->va_mtime = vap->va_ctime = vap->va_atime;
69 return (objfs_common_getattr(vp, vap));
70 }
71
72 /* ARGSUSED */
73 static int
objfs_root_do_lookup(vnode_t * vp,const char * nm,vnode_t ** vpp,ino64_t * inop,cred_t * cr,int flags,int * deflags,pathname_t * rpnp)74 objfs_root_do_lookup(vnode_t *vp, const char *nm, vnode_t **vpp, ino64_t *inop,
75 cred_t *cr, int flags, int *deflags, pathname_t *rpnp)
76 {
77 int result = ENOENT;
78 struct modctl *mp;
79
80 /*
81 * Run through all the loaded modules on the system looking for
82 * a matching module name.
83 */
84 mutex_enter(&mod_lock);
85 mp = &modules;
86 do {
87 if (mp->mod_loaded &&
88 strcmp(nm, mp->mod_modname) == 0) {
89 /*
90 * We drop mod_lock in order to do allocations,
91 * as modctls are persistent.
92 */
93 mutex_exit(&mod_lock);
94 *vpp = objfs_create_odirnode(vp, mp);
95 *inop = OBJFS_INO_ODIR(mp->mod_id);
96 mutex_enter(&mod_lock);
97 result = 0;
98 break;
99 }
100 } while ((mp = mp->mod_next) != &modules);
101 mutex_exit(&mod_lock);
102
103 return (result);
104 }
105
106 /* ARGSUSED */
107 int
objfs_root_do_readdir(vnode_t * vp,void * dp,int * eofp,offset_t * offp,offset_t * nextp,void * data,int flags)108 objfs_root_do_readdir(vnode_t *vp, void *dp, int *eofp,
109 offset_t *offp, offset_t *nextp, void *data, int flags)
110 {
111 struct modctl **mpp = data;
112 struct modctl *mp = *mpp;
113 struct dirent64 *odp = dp;
114
115 ASSERT(!(flags & V_RDDIR_ENTFLAGS));
116
117 mutex_enter(&mod_lock);
118
119 /* Check for EOF */
120 if (*offp >= last_module_id) {
121 *eofp = 1;
122 mutex_exit(&mod_lock);
123 return (0);
124 }
125
126 /*
127 * Find the appropriate modctl
128 */
129 while (mp->mod_id < *offp) {
130 mp = mp->mod_next;
131 ASSERT(mp != &modules);
132 }
133
134 while (!mp->mod_loaded && mp != &modules)
135 mp = mp->mod_next;
136
137 if (mp == &modules && *offp != 0) {
138 *eofp = 1;
139 mutex_exit(&mod_lock);
140 return (0);
141 }
142
143 /*
144 * The modctl will not change, as they are persistent.
145 */
146 mutex_exit(&mod_lock);
147
148 (void) strncpy(odp->d_name, mp->mod_modname, OBJFS_NAME_MAX);
149 odp->d_ino = OBJFS_INO_ODIR(mp->mod_id);
150 *offp = mp->mod_id;
151 *nextp = mp->mod_id + 1;
152
153 return (0);
154 }
155
156 /* ARGSUSED */
157 static int
objfs_root_readdir(vnode_t * vp,uio_t * uiop,cred_t * cr,int * eofp,caller_context_t * ct,int flags)158 objfs_root_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp,
159 caller_context_t *ct, int flags)
160 {
161 struct modctl *mp = &modules;
162
163 return (gfs_dir_readdir(vp, uiop, eofp, &mp, cr, ct, flags));
164 }
165
166 const fs_operation_def_t objfs_tops_root[] = {
167 { VOPNAME_OPEN, { .vop_open = objfs_dir_open } },
168 { VOPNAME_CLOSE, { .vop_close = objfs_common_close } },
169 { VOPNAME_IOCTL, { .error = fs_inval } },
170 { VOPNAME_GETATTR, { .vop_getattr = objfs_root_getattr } },
171 { VOPNAME_ACCESS, { .vop_access = objfs_dir_access } },
172 { VOPNAME_READDIR, { .vop_readdir = objfs_root_readdir } },
173 { VOPNAME_LOOKUP, { .vop_lookup = gfs_vop_lookup } },
174 { VOPNAME_SEEK, { .vop_seek = fs_seek } },
175 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
176 { NULL }
177 };
178