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 #include <fs/fs_subr.h>
27
28 #include <sys/errno.h>
29 #include <sys/kmem.h>
30 #include <sys/modctl.h>
31 #include <sys/objfs.h>
32 #include <sys/objfs_impl.h>
33 #include <sys/vfs_opreg.h>
34 #include <sys/systm.h>
35
36 extern int last_module_id;
37
38 static int objfs_root_do_lookup(vnode_t *, const char *, vnode_t **, ino64_t *,
39 cred_t *, int, int *, pathname_t *);
40 static int objfs_root_do_readdir(vnode_t *, void *, int *,
41 offset_t *, offset_t *, void *, int);
42
43 vnode_t *
objfs_create_root(vfs_t * vfsp)44 objfs_create_root(vfs_t *vfsp)
45 {
46 vnode_t *vp = gfs_root_create(sizeof (objfs_rootnode_t), vfsp,
47 objfs_ops_root, OBJFS_INO_ROOT, NULL, NULL, OBJFS_NAME_MAX,
48 objfs_root_do_readdir, objfs_root_do_lookup);
49
50 return (vp);
51 }
52
53 /* ARGSUSED */
54 static int
objfs_root_getattr(vnode_t * vp,vattr_t * vap,int flags,cred_t * cr,caller_context_t * ct)55 objfs_root_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
56 caller_context_t *ct)
57 {
58 vap->va_type = VDIR;
59 vap->va_mode = 0555;
60 vap->va_nodeid = gfs_file_inode(vp);
61 vap->va_nlink = objfs_nobjs() + 2;
62 vap->va_size = vap->va_nlink;
63 vap->va_atime.tv_sec = vp->v_vfsp->vfs_mtime;
64 vap->va_atime.tv_nsec = 0;
65 vap->va_mtime = vap->va_ctime = vap->va_atime;
66 return (objfs_common_getattr(vp, vap));
67 }
68
69 /* ARGSUSED */
70 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)71 objfs_root_do_lookup(vnode_t *vp, const char *nm, vnode_t **vpp, ino64_t *inop,
72 cred_t *cr, int flags, int *deflags, pathname_t *rpnp)
73 {
74 int result = ENOENT;
75 struct modctl *mp;
76
77 /*
78 * Run through all the loaded modules on the system looking for
79 * a matching module name.
80 */
81 mutex_enter(&mod_lock);
82 mp = &modules;
83 do {
84 if (mp->mod_loaded &&
85 strcmp(nm, mp->mod_modname) == 0) {
86 /*
87 * We drop mod_lock in order to do allocations,
88 * as modctls are persistent.
89 */
90 mutex_exit(&mod_lock);
91 *vpp = objfs_create_odirnode(vp, mp);
92 *inop = OBJFS_INO_ODIR(mp->mod_id);
93 mutex_enter(&mod_lock);
94 result = 0;
95 break;
96 }
97 } while ((mp = mp->mod_next) != &modules);
98 mutex_exit(&mod_lock);
99
100 return (result);
101 }
102
103 /* ARGSUSED */
104 int
objfs_root_do_readdir(vnode_t * vp,void * dp,int * eofp,offset_t * offp,offset_t * nextp,void * data,int flags)105 objfs_root_do_readdir(vnode_t *vp, void *dp, int *eofp,
106 offset_t *offp, offset_t *nextp, void *data, int flags)
107 {
108 struct modctl **mpp = data;
109 struct modctl *mp = *mpp;
110 struct dirent64 *odp = dp;
111
112 ASSERT(!(flags & V_RDDIR_ENTFLAGS));
113
114 mutex_enter(&mod_lock);
115
116 /* Check for EOF */
117 if (*offp >= last_module_id) {
118 *eofp = 1;
119 mutex_exit(&mod_lock);
120 return (0);
121 }
122
123 /*
124 * Find the appropriate modctl
125 */
126 while (mp->mod_id < *offp) {
127 mp = mp->mod_next;
128 ASSERT(mp != &modules);
129 }
130
131 while (!mp->mod_loaded && mp != &modules)
132 mp = mp->mod_next;
133
134 if (mp == &modules && *offp != 0) {
135 *eofp = 1;
136 mutex_exit(&mod_lock);
137 return (0);
138 }
139
140 /*
141 * The modctl will not change, as they are persistent.
142 */
143 mutex_exit(&mod_lock);
144
145 (void) strncpy(odp->d_name, mp->mod_modname, OBJFS_NAME_MAX);
146 odp->d_ino = OBJFS_INO_ODIR(mp->mod_id);
147 *offp = mp->mod_id;
148 *nextp = mp->mod_id + 1;
149
150 return (0);
151 }
152
153 /* ARGSUSED */
154 static int
objfs_root_readdir(vnode_t * vp,uio_t * uiop,cred_t * cr,int * eofp,caller_context_t * ct,int flags)155 objfs_root_readdir(vnode_t *vp, uio_t *uiop, cred_t *cr, int *eofp,
156 caller_context_t *ct, int flags)
157 {
158 struct modctl *mp = &modules;
159
160 return (gfs_dir_readdir(vp, uiop, eofp, &mp, cr, ct, flags));
161 }
162
163 const fs_operation_def_t objfs_tops_root[] = {
164 { VOPNAME_OPEN, { .vop_open = objfs_dir_open } },
165 { VOPNAME_CLOSE, { .vop_close = objfs_common_close } },
166 { VOPNAME_IOCTL, { .error = fs_inval } },
167 { VOPNAME_GETATTR, { .vop_getattr = objfs_root_getattr } },
168 { VOPNAME_ACCESS, { .vop_access = objfs_dir_access } },
169 { VOPNAME_READDIR, { .vop_readdir = objfs_root_readdir } },
170 { VOPNAME_LOOKUP, { .vop_lookup = gfs_vop_lookup } },
171 { VOPNAME_SEEK, { .vop_seek = fs_seek } },
172 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } },
173 { NULL }
174 };
175