kernel/fs/ctfs/ctfs_cdir.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 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 #include <sys/types.h>
  29 #include <sys/param.h>
  30 #include <sys/time.h>
  31 #include <sys/cred.h>
  32 #include <sys/vfs.h>
  33 #include <sys/gfs.h>
  34 #include <sys/vnode.h>
  35 #include <sys/systm.h>
  36 #include <sys/errno.h>
  37 #include <sys/sysmacros.h>
  38 #include <sys/fs_subr.h>
  39 #include <sys/contract.h>
  40 #include <sys/contract_impl.h>
  41 #include <sys/ctfs.h>
  42 #include <sys/ctfs_impl.h>
  43 #include <sys/file.h>
  44 #include <sys/pathname.h>
  45
  46 /*
  47  * Entries in a /system/contract/<type>/<ctid> directory.
  48  */
  49 static gfs_dirent_t ctfs_ctls[] = {
  50         { "ctl", ctfs_create_ctlnode, GFS_CACHE_VNODE, },
  51         { "status", ctfs_create_statnode, GFS_CACHE_VNODE },
  52         { "events", ctfs_create_evnode },
  53         { NULL }
  54 };
  55 #define CTFS_NCTLS      ((sizeof ctfs_ctls / sizeof (gfs_dirent_t)) - 1)
  56
  57 static ino64_t ctfs_cdir_do_inode(vnode_t *, int);
  58
  59 /*
  60  * ctfs_create_cdirnode
  61  *
  62  * If necessary, creates a cdirnode for the specified contract and
  63  * inserts it into the contract's list of vnodes.  Returns either the
  64  * existing vnode or the new one.
  65  */
  66 vnode_t *
  67 ctfs_create_cdirnode(vnode_t *pvp, contract_t *ct)
  68 {
  69         vnode_t *vp;
  70         ctfs_cdirnode_t *cdir;
  71
  72         if ((vp = contract_vnode_get(ct, pvp->v_vfsp)) != NULL)
  73                 return (vp);
  74
  75         vp = gfs_dir_create(sizeof (ctfs_cdirnode_t), pvp, &ctfs_ops_cdir,
  76             ctfs_ctls, ctfs_cdir_do_inode, CTFS_NAME_MAX, NULL, NULL);
  77         cdir = vp->v_data;
  78
  79         /*
  80          * We must set the inode because this is called explicitly rather than
  81          * through GFS callbacks.
  82          */
  83         gfs_file_set_inode(vp, CTFS_INO_CT_DIR(ct->ct_id));
  84
  85         cdir->ctfs_cn_contract  = ct;
  86         contract_hold(ct);
  87         contract_vnode_set(ct, &cdir->ctfs_cn_linkage, vp);
  88
  89         return (vp);
  90 }
  91
  92 /*
  93  * ctfs_cdir_getattr - fop_getattr entry point
  94  */
  95 /* ARGSUSED */
  96 static int
  97 ctfs_cdir_getattr(
  98         vnode_t *vp,
  99         vattr_t *vap,
 100         int flags,
 101         cred_t *cr,
 102         caller_context_t *ct)
 103 {
 104         ctfs_cdirnode_t *cdirnode = vp->v_data;
 105
 106         vap->va_type = VDIR;
 107         vap->va_mode = 0555;
 108         vap->va_nlink = 2 + CTFS_NCTLS;
 109         vap->va_size = vap->va_nlink;
 110         vap->va_ctime = cdirnode->ctfs_cn_contract->ct_ctime;
 111         mutex_enter(&cdirnode->ctfs_cn_contract->ct_events.ctq_lock);
 112         vap->va_atime = vap->va_mtime =
 113             cdirnode->ctfs_cn_contract->ct_events.ctq_atime;
 114         mutex_exit(&cdirnode->ctfs_cn_contract->ct_events.ctq_lock);
 115         ctfs_common_getattr(vp, vap);
 116
 117         return (0);
 118 }
 119
 120 /*
 121  * ctfs_cdir_do_inode - return inode number based on static index
 122  */
 123 static ino64_t
 124 ctfs_cdir_do_inode(vnode_t *vp, int index)
 125 {
 126         ctfs_cdirnode_t *cdirnode = vp->v_data;
 127
 128         return (CTFS_INO_CT_FILE(cdirnode->ctfs_cn_contract->ct_id, index));
 129 }
 130
 131 /*
 132  * ctfs_cdir_inactive - fop_inactive entry point
 133  */
 134 /* ARGSUSED */
 135 static void
 136 ctfs_cdir_inactive(vnode_t *vp, cred_t *cr, caller_context_t *cct)
 137 {
 138         ctfs_cdirnode_t *cdirnode = vp->v_data;
 139         contract_t *ct = cdirnode->ctfs_cn_contract;
 140
 141         mutex_enter(&ct->ct_lock);
 142         if (gfs_dir_inactive(vp) == NULL) {
 143                 mutex_exit(&ct->ct_lock);
 144                 return;
 145         }
 146
 147         list_remove(&ct->ct_vnodes, &cdirnode->ctfs_cn_linkage);
 148         mutex_exit(&ct->ct_lock);
 149
 150         contract_rele(ct);
 151         kmem_free(cdirnode, sizeof (ctfs_cdirnode_t));
 152 }
 153
 154
 155 const struct vnodeops ctfs_ops_cdir = {
 156         .vnop_name = "ctfs contract directory",
 157         .vop_open = ctfs_open,
 158         .vop_close = ctfs_close,
 159         .vop_ioctl = fs_inval,
 160         .vop_getattr = ctfs_cdir_getattr,
 161         .vop_access = ctfs_access_dir,
 162         .vop_readdir = gfs_vop_readdir,
 163         .vop_lookup = gfs_vop_lookup,
 164         .vop_seek = fs_seek,
 165         .vop_inactive = ctfs_cdir_inactive,
 166 };