usr/src/uts/common/fs/objfs/objfs_root.c

   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 *
  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
  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
  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
 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
 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 };