1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* 30*0Sstevel@tonic-gate * Redirecting driver; used to handle workstation console redirection. 31*0Sstevel@tonic-gate * 32*0Sstevel@tonic-gate * Redirects all I/O through a given device instance to the device designated 33*0Sstevel@tonic-gate * as the current target, as given by the vnode associated with the first 34*0Sstevel@tonic-gate * entry in the list of redirections for the given device instance. The 35*0Sstevel@tonic-gate * implementation assumes that this vnode denotes a STREAMS device; this is 36*0Sstevel@tonic-gate * perhaps a bug. 37*0Sstevel@tonic-gate * 38*0Sstevel@tonic-gate * Supports the SRIOCSREDIR ioctl for designating a new redirection target. 39*0Sstevel@tonic-gate * The new target is added to the front of a list of potentially active 40*0Sstevel@tonic-gate * designees. Should the device at the front of this list be closed, the new 41*0Sstevel@tonic-gate * front entry assumes active duty. (Stated differently, redirection targets 42*0Sstevel@tonic-gate * stack, except that it's possible for entries in the interior of the stack 43*0Sstevel@tonic-gate * to go away.) 44*0Sstevel@tonic-gate * 45*0Sstevel@tonic-gate * Supports the SRIOCISREDIR ioctl for inquiring whether the descriptor given 46*0Sstevel@tonic-gate * as argument is the current front of the redirection list associated with 47*0Sstevel@tonic-gate * the descriptor on which the ioctl was issued. 48*0Sstevel@tonic-gate * 49*0Sstevel@tonic-gate * Every open instance of this driver corresponds to an instance of the 50*0Sstevel@tonic-gate * underlying client driver. If the redirection stack would otherwise become 51*0Sstevel@tonic-gate * empty, this device (designated by the wd_vp field of the wcd_data 52*0Sstevel@tonic-gate * structure) is implicitly opened and added to the front of the list. Thus, 53*0Sstevel@tonic-gate * there's always an active device for handling i/o through an open instance 54*0Sstevel@tonic-gate * of this driver. 55*0Sstevel@tonic-gate * 56*0Sstevel@tonic-gate * XXX: Names -- many of the names in this driver and its companion STREAMS 57*0Sstevel@tonic-gate * module still reflect its origins as the workstation console 58*0Sstevel@tonic-gate * redirection driver. Ultimately, they should be changed to reflect the 59*0Sstevel@tonic-gate * fact that this driver is potentially a general purpose redirection 60*0Sstevel@tonic-gate * driver. In the meantime, the driver is still specialized to have a 61*0Sstevel@tonic-gate * single client -- the workstation console driver -- and its file name 62*0Sstevel@tonic-gate * remains iwscons.c to reflect that specialization. 63*0Sstevel@tonic-gate * 64*0Sstevel@tonic-gate * Proposed change: "iwscn" becomes either "dr" (for "streams redirecting 65*0Sstevel@tonic-gate * driver") or "srm" (for "streams redirecting module"), as appropriate. 66*0Sstevel@tonic-gate * 67*0Sstevel@tonic-gate * XXX: Add mechanism for notifying a redirectee that it's no longer the 68*0Sstevel@tonic-gate * current redirectee? (This in contrast to the current facility for 69*0Sstevel@tonic-gate * letting it ask.) 70*0Sstevel@tonic-gate */ 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate #include <sys/types.h> 73*0Sstevel@tonic-gate #include <sys/sysmacros.h> 74*0Sstevel@tonic-gate #include <sys/open.h> 75*0Sstevel@tonic-gate #include <sys/param.h> 76*0Sstevel@tonic-gate #include <sys/systm.h> 77*0Sstevel@tonic-gate #include <sys/signal.h> 78*0Sstevel@tonic-gate #include <sys/cred.h> 79*0Sstevel@tonic-gate #include <sys/user.h> 80*0Sstevel@tonic-gate #include <sys/proc.h> 81*0Sstevel@tonic-gate #include <sys/vnode.h> 82*0Sstevel@tonic-gate #include <sys/uio.h> 83*0Sstevel@tonic-gate #include <sys/file.h> 84*0Sstevel@tonic-gate #include <sys/kmem.h> 85*0Sstevel@tonic-gate #include <sys/stat.h> 86*0Sstevel@tonic-gate 87*0Sstevel@tonic-gate #include <sys/stream.h> 88*0Sstevel@tonic-gate #include <sys/stropts.h> 89*0Sstevel@tonic-gate #include <sys/strsubr.h> 90*0Sstevel@tonic-gate #include <sys/poll.h> 91*0Sstevel@tonic-gate 92*0Sstevel@tonic-gate #include <sys/debug.h> 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate #include <sys/strredir.h> 95*0Sstevel@tonic-gate 96*0Sstevel@tonic-gate #include <sys/conf.h> 97*0Sstevel@tonic-gate #include <sys/ddi.h> 98*0Sstevel@tonic-gate #include <sys/sunddi.h> 99*0Sstevel@tonic-gate 100*0Sstevel@tonic-gate static int iwscninfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 101*0Sstevel@tonic-gate static int iwscnattach(dev_info_t *, ddi_attach_cmd_t); 102*0Sstevel@tonic-gate static int iwscnopen(dev_t *, int, int, cred_t *); 103*0Sstevel@tonic-gate static int iwscnclose(dev_t, int, int, cred_t *); 104*0Sstevel@tonic-gate static int iwscnread(dev_t, struct uio *, cred_t *); 105*0Sstevel@tonic-gate static int iwscnwrite(dev_t, struct uio *, cred_t *); 106*0Sstevel@tonic-gate static int iwscnioctl(dev_t, int, intptr_t, int, cred_t *, int *); 107*0Sstevel@tonic-gate static int iwscnpoll(dev_t, short, int, short *, struct pollhead **); 108*0Sstevel@tonic-gate 109*0Sstevel@tonic-gate /* 110*0Sstevel@tonic-gate * Private copy of devinfo pointer; iwscninfo uses it. 111*0Sstevel@tonic-gate */ 112*0Sstevel@tonic-gate static dev_info_t *iwscn_dip; 113*0Sstevel@tonic-gate 114*0Sstevel@tonic-gate struct cb_ops iwscn_cb_ops = { 115*0Sstevel@tonic-gate iwscnopen, /* open */ 116*0Sstevel@tonic-gate iwscnclose, /* close */ 117*0Sstevel@tonic-gate nodev, /* strategy */ 118*0Sstevel@tonic-gate nodev, /* print */ 119*0Sstevel@tonic-gate nodev, /* dump */ 120*0Sstevel@tonic-gate iwscnread, /* read */ 121*0Sstevel@tonic-gate iwscnwrite, /* write */ 122*0Sstevel@tonic-gate iwscnioctl, /* ioctl */ 123*0Sstevel@tonic-gate nodev, /* devmap */ 124*0Sstevel@tonic-gate nodev, /* mmap */ 125*0Sstevel@tonic-gate nodev, /* segmap */ 126*0Sstevel@tonic-gate iwscnpoll, /* poll */ 127*0Sstevel@tonic-gate ddi_prop_op, /* cb_prop_op */ 128*0Sstevel@tonic-gate 0, /* streamtab */ 129*0Sstevel@tonic-gate D_NEW|D_MP /* Driver compatibility flag */ 130*0Sstevel@tonic-gate }; 131*0Sstevel@tonic-gate 132*0Sstevel@tonic-gate struct dev_ops iwscn_ops = { 133*0Sstevel@tonic-gate DEVO_REV, /* devo_rev, */ 134*0Sstevel@tonic-gate 0, /* refcnt */ 135*0Sstevel@tonic-gate iwscninfo, /* info */ 136*0Sstevel@tonic-gate nulldev, /* identify */ 137*0Sstevel@tonic-gate nulldev, /* probe */ 138*0Sstevel@tonic-gate iwscnattach, /* attach */ 139*0Sstevel@tonic-gate nodev, /* detach */ 140*0Sstevel@tonic-gate nodev, /* reset */ 141*0Sstevel@tonic-gate &iwscn_cb_ops, /* driver operations */ 142*0Sstevel@tonic-gate NULL /* bus operations */ 143*0Sstevel@tonic-gate }; 144*0Sstevel@tonic-gate 145*0Sstevel@tonic-gate static krwlock_t iwscn_lock; /* lock proecting almost everything here */ 146*0Sstevel@tonic-gate 147*0Sstevel@tonic-gate /* 148*0Sstevel@tonic-gate * A read/write lock was used to serialize reads,writes/opens,closes. 149*0Sstevel@tonic-gate * Sometime the open would hang due to a pending read. The new lock 150*0Sstevel@tonic-gate * iwscn_open_lock and the read lock are held in open to assure a single 151*0Sstevel@tonic-gate * instance, while letting concurrent reads/writes to proceed. 152*0Sstevel@tonic-gate */ 153*0Sstevel@tonic-gate static kmutex_t iwscn_open_lock; /* Serializes opens */ 154*0Sstevel@tonic-gate 155*0Sstevel@tonic-gate /* 156*0Sstevel@tonic-gate * These next two fields, protected by iwscn_lock, pass the data to wcmopen() 157*0Sstevel@tonic-gate * from the ioctl SRIOCSREDIR. wcmopen() uses the data only if the thread 158*0Sstevel@tonic-gate * matches. This keeps other threads from interfering. 159*0Sstevel@tonic-gate */ 160*0Sstevel@tonic-gate extern kthread_id_t iwscn_thread; /* thread that is allowed to */ 161*0Sstevel@tonic-gate /* push redirm */ 162*0Sstevel@tonic-gate extern wcm_data_t *iwscn_wcm_data; /* allocated data for redirm */ 163*0Sstevel@tonic-gate 164*0Sstevel@tonic-gate /* 165*0Sstevel@tonic-gate * Forward declarations of private routines. 166*0Sstevel@tonic-gate */ 167*0Sstevel@tonic-gate static int srreset(wcd_data_t *, int, cred_t *); 168*0Sstevel@tonic-gate static wcrlist_t *srrm(wcrlist_t **, vnode_t *, int); 169*0Sstevel@tonic-gate static wcd_data_t *srilookup(minor_t); 170*0Sstevel@tonic-gate static wcd_data_t *srialloc(minor_t); 171*0Sstevel@tonic-gate static void sridealloc(wcd_data_t *); 172*0Sstevel@tonic-gate static wcrlist_t *srpush(wcrlist_t **, vnode_t *); 173*0Sstevel@tonic-gate 174*0Sstevel@tonic-gate /* 175*0Sstevel@tonic-gate * The head of the list of open instances. 176*0Sstevel@tonic-gate */ 177*0Sstevel@tonic-gate static wcd_data_t *wcddata; 178*0Sstevel@tonic-gate 179*0Sstevel@tonic-gate /* 180*0Sstevel@tonic-gate * Currently, the only client of this driver is the workstation console 181*0Sstevel@tonic-gate * driver. Thus, we can get away with hard-wiring a reference to it here. 182*0Sstevel@tonic-gate * 183*0Sstevel@tonic-gate * To handle multiple clients, the driver must be revised as follows. 184*0Sstevel@tonic-gate * 1) Add a registration routine that clients can call to announce 185*0Sstevel@tonic-gate * themselves to this driver. The routine should take as arguments the 186*0Sstevel@tonic-gate * major device number of the corresponding instantiation of the 187*0Sstevel@tonic-gate * redirecting driver and a pointer to its dedvnops ops vector. 188*0Sstevel@tonic-gate * 2) Maintain a list (or perhaps hash array) or registered clients, 189*0Sstevel@tonic-gate * recording for each the srvnops ops vector and a pointer to the list 190*0Sstevel@tonic-gate * of open instances for that client. 191*0Sstevel@tonic-gate * 3) Modify the driver entry points to use their dev argument to look up 192*0Sstevel@tonic-gate * the proper instantiation, get the list of open instances, and then use 193*0Sstevel@tonic-gate * that as they currently use the open instance list. 194*0Sstevel@tonic-gate * 4) To allow clients to unload themselves, we probably need an unregister 195*0Sstevel@tonic-gate * routine. This routine would have to cope with active open instances. 196*0Sstevel@tonic-gate */ 197*0Sstevel@tonic-gate extern srvnops_t wscons_srvnops; 198*0Sstevel@tonic-gate 199*0Sstevel@tonic-gate #include <sys/types.h> 200*0Sstevel@tonic-gate #include <sys/conf.h> 201*0Sstevel@tonic-gate #include <sys/param.h> 202*0Sstevel@tonic-gate #include <sys/systm.h> 203*0Sstevel@tonic-gate #include <sys/errno.h> 204*0Sstevel@tonic-gate #include <sys/modctl.h> 205*0Sstevel@tonic-gate 206*0Sstevel@tonic-gate /* 207*0Sstevel@tonic-gate * Module linkage information for the kernel. 208*0Sstevel@tonic-gate */ 209*0Sstevel@tonic-gate 210*0Sstevel@tonic-gate static struct modldrv modldrv = { 211*0Sstevel@tonic-gate &mod_driverops, /* Type of module. This one is a pseudo driver */ 212*0Sstevel@tonic-gate "Workstation Redirection driver 'iwscn' %I%", 213*0Sstevel@tonic-gate &iwscn_ops, /* driver ops */ 214*0Sstevel@tonic-gate }; 215*0Sstevel@tonic-gate 216*0Sstevel@tonic-gate static struct modlinkage modlinkage = { 217*0Sstevel@tonic-gate MODREV_1, 218*0Sstevel@tonic-gate &modldrv, 219*0Sstevel@tonic-gate NULL 220*0Sstevel@tonic-gate }; 221*0Sstevel@tonic-gate 222*0Sstevel@tonic-gate 223*0Sstevel@tonic-gate int 224*0Sstevel@tonic-gate _init(void) 225*0Sstevel@tonic-gate { 226*0Sstevel@tonic-gate return (mod_install(&modlinkage)); 227*0Sstevel@tonic-gate } 228*0Sstevel@tonic-gate 229*0Sstevel@tonic-gate int 230*0Sstevel@tonic-gate _fini(void) 231*0Sstevel@tonic-gate { 232*0Sstevel@tonic-gate return (EBUSY); 233*0Sstevel@tonic-gate } 234*0Sstevel@tonic-gate 235*0Sstevel@tonic-gate int 236*0Sstevel@tonic-gate _info(struct modinfo *modinfop) 237*0Sstevel@tonic-gate { 238*0Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop)); 239*0Sstevel@tonic-gate } 240*0Sstevel@tonic-gate 241*0Sstevel@tonic-gate /* 242*0Sstevel@tonic-gate * DDI glue routines. 243*0Sstevel@tonic-gate */ 244*0Sstevel@tonic-gate 245*0Sstevel@tonic-gate /*ARGSUSED*/ 246*0Sstevel@tonic-gate static int 247*0Sstevel@tonic-gate iwscnattach(dev_info_t *devi, ddi_attach_cmd_t cmd) 248*0Sstevel@tonic-gate { 249*0Sstevel@tonic-gate static char been_here; 250*0Sstevel@tonic-gate 251*0Sstevel@tonic-gate if (!been_here) { 252*0Sstevel@tonic-gate been_here = 1; 253*0Sstevel@tonic-gate rw_init(&iwscn_lock, NULL, RW_DEFAULT, NULL); 254*0Sstevel@tonic-gate } 255*0Sstevel@tonic-gate if (ddi_create_minor_node(devi, "iwscn", S_IFCHR, 256*0Sstevel@tonic-gate 0, DDI_PSEUDO, NULL) == DDI_FAILURE) { 257*0Sstevel@tonic-gate ddi_remove_minor_node(devi, NULL); 258*0Sstevel@tonic-gate return (-1); 259*0Sstevel@tonic-gate } 260*0Sstevel@tonic-gate iwscn_dip = devi; 261*0Sstevel@tonic-gate return (DDI_SUCCESS); 262*0Sstevel@tonic-gate } 263*0Sstevel@tonic-gate 264*0Sstevel@tonic-gate /* ARGSUSED */ 265*0Sstevel@tonic-gate static int 266*0Sstevel@tonic-gate iwscninfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 267*0Sstevel@tonic-gate { 268*0Sstevel@tonic-gate int error; 269*0Sstevel@tonic-gate 270*0Sstevel@tonic-gate switch (infocmd) { 271*0Sstevel@tonic-gate case DDI_INFO_DEVT2DEVINFO: 272*0Sstevel@tonic-gate if (iwscn_dip == NULL) { 273*0Sstevel@tonic-gate error = DDI_FAILURE; 274*0Sstevel@tonic-gate } else { 275*0Sstevel@tonic-gate *result = (void *)iwscn_dip; 276*0Sstevel@tonic-gate error = DDI_SUCCESS; 277*0Sstevel@tonic-gate } 278*0Sstevel@tonic-gate break; 279*0Sstevel@tonic-gate case DDI_INFO_DEVT2INSTANCE: 280*0Sstevel@tonic-gate *result = (void *)0; 281*0Sstevel@tonic-gate error = DDI_SUCCESS; 282*0Sstevel@tonic-gate break; 283*0Sstevel@tonic-gate default: 284*0Sstevel@tonic-gate error = DDI_FAILURE; 285*0Sstevel@tonic-gate } 286*0Sstevel@tonic-gate return (error); 287*0Sstevel@tonic-gate } 288*0Sstevel@tonic-gate 289*0Sstevel@tonic-gate 290*0Sstevel@tonic-gate /* ARGSUSED */ 291*0Sstevel@tonic-gate static int 292*0Sstevel@tonic-gate iwscnopen( 293*0Sstevel@tonic-gate dev_t *devp, 294*0Sstevel@tonic-gate int flag, 295*0Sstevel@tonic-gate int state, /* should be OTYP_CHR */ 296*0Sstevel@tonic-gate cred_t *cred) 297*0Sstevel@tonic-gate { 298*0Sstevel@tonic-gate minor_t unit = getminor(*devp); 299*0Sstevel@tonic-gate wcd_data_t *wd; 300*0Sstevel@tonic-gate int err = 0; 301*0Sstevel@tonic-gate struct wcrlist *wwd; 302*0Sstevel@tonic-gate 303*0Sstevel@tonic-gate if (state != OTYP_CHR) 304*0Sstevel@tonic-gate return (ENXIO); 305*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 306*0Sstevel@tonic-gate mutex_enter(&iwscn_open_lock); 307*0Sstevel@tonic-gate if ((wd = srilookup(unit)) == NULL) { 308*0Sstevel@tonic-gate vnode_t *vp; 309*0Sstevel@tonic-gate 310*0Sstevel@tonic-gate /* 311*0Sstevel@tonic-gate * First open for this instance; get a state structure for it. 312*0Sstevel@tonic-gate */ 313*0Sstevel@tonic-gate wd = srialloc(unit); 314*0Sstevel@tonic-gate 315*0Sstevel@tonic-gate /* 316*0Sstevel@tonic-gate * Call the client driver to obtain a held vnode for the 317*0Sstevel@tonic-gate * underlying "real" device instance. 318*0Sstevel@tonic-gate * 319*0Sstevel@tonic-gate * XXX: There's wired in knowledge of the client driver here. 320*0Sstevel@tonic-gate */ 321*0Sstevel@tonic-gate err = wscons_srvnops.svn_get(unit, &vp); 322*0Sstevel@tonic-gate if (err != 0) { 323*0Sstevel@tonic-gate sridealloc(wd); 324*0Sstevel@tonic-gate mutex_exit(&iwscn_open_lock); 325*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 326*0Sstevel@tonic-gate return (err); 327*0Sstevel@tonic-gate } 328*0Sstevel@tonic-gate wd->wd_vp = vp; 329*0Sstevel@tonic-gate } 330*0Sstevel@tonic-gate 331*0Sstevel@tonic-gate /* 332*0Sstevel@tonic-gate * Reinitalize the list if necessary. 333*0Sstevel@tonic-gate * 334*0Sstevel@tonic-gate * XXX: Is it possible for the list to empty completely while this 335*0Sstevel@tonic-gate * instance is still open? If not, this if should be coalesced 336*0Sstevel@tonic-gate * with the previous one. 337*0Sstevel@tonic-gate */ 338*0Sstevel@tonic-gate if (wd->wd_list == NULL) { 339*0Sstevel@tonic-gate wcrlist_t *e = srpush(&wd->wd_list, wd->wd_vp); 340*0Sstevel@tonic-gate 341*0Sstevel@tonic-gate /* 342*0Sstevel@tonic-gate * There's no corresponding redirecting module instance for 343*0Sstevel@tonic-gate * the underlying device. 344*0Sstevel@tonic-gate */ 345*0Sstevel@tonic-gate e->wl_data = NULL; 346*0Sstevel@tonic-gate } 347*0Sstevel@tonic-gate 348*0Sstevel@tonic-gate err = srreset(wd, flag, cred); 349*0Sstevel@tonic-gate /* 350*0Sstevel@tonic-gate * XXX cleanup the sig list. Hook for console driver. 351*0Sstevel@tonic-gate */ 352*0Sstevel@tonic-gate for (wwd = wd->wd_list; wwd != NULL; wwd = wwd->wl_next) { 353*0Sstevel@tonic-gate ASSERT(wwd->wl_vp->v_stream != NULL); 354*0Sstevel@tonic-gate str_cn_clean(wwd->wl_vp); 355*0Sstevel@tonic-gate } 356*0Sstevel@tonic-gate mutex_exit(&iwscn_open_lock); 357*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 358*0Sstevel@tonic-gate return (err); 359*0Sstevel@tonic-gate } 360*0Sstevel@tonic-gate 361*0Sstevel@tonic-gate /* ARGSUSED */ 362*0Sstevel@tonic-gate static int 363*0Sstevel@tonic-gate iwscnclose( 364*0Sstevel@tonic-gate dev_t dev, 365*0Sstevel@tonic-gate int flag, 366*0Sstevel@tonic-gate int state, /* should be OTYP_CHR */ 367*0Sstevel@tonic-gate cred_t *cred) 368*0Sstevel@tonic-gate { 369*0Sstevel@tonic-gate wcd_data_t *wd; 370*0Sstevel@tonic-gate int err = 0; 371*0Sstevel@tonic-gate 372*0Sstevel@tonic-gate if (state != OTYP_CHR) 373*0Sstevel@tonic-gate return (ENXIO); 374*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_WRITER); 375*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 376*0Sstevel@tonic-gate /* 377*0Sstevel@tonic-gate * Remove all outstanding redirections for this instance. 378*0Sstevel@tonic-gate */ 379*0Sstevel@tonic-gate while (wd->wd_list != NULL) 380*0Sstevel@tonic-gate (void) srrm(&wd->wd_list, wd->wd_list->wl_vp, 1); 381*0Sstevel@tonic-gate 382*0Sstevel@tonic-gate /* 383*0Sstevel@tonic-gate * Since this is the _last_ close, it's our last chance to close the 384*0Sstevel@tonic-gate * underlying device. (Note that if someone else has the underlying 385*0Sstevel@tonic-gate * workstation console device open, we won't get here, since 386*0Sstevel@tonic-gate * spec_close will see s_count > 1.) 387*0Sstevel@tonic-gate */ 388*0Sstevel@tonic-gate while ((wd->wd_wsconsopen != 0) && (!err)) { 389*0Sstevel@tonic-gate err = VOP_CLOSE(wd->wd_vp, flag, 1, (offset_t)0, cred); 390*0Sstevel@tonic-gate if (!err) 391*0Sstevel@tonic-gate wd->wd_wsconsopen--; 392*0Sstevel@tonic-gate } 393*0Sstevel@tonic-gate if (!err) 394*0Sstevel@tonic-gate wd->wd_vp->v_stream = NULL; 395*0Sstevel@tonic-gate 396*0Sstevel@tonic-gate /* 397*0Sstevel@tonic-gate * We don't need the vnode that the client driver gave us any more. 398*0Sstevel@tonic-gate * 399*0Sstevel@tonic-gate * XXX: There's wired in knowledge of the client driver here. 400*0Sstevel@tonic-gate */ 401*0Sstevel@tonic-gate wscons_srvnops.svn_rele(wd->wd_unit, wd->wd_vp); 402*0Sstevel@tonic-gate sridealloc(wd); 403*0Sstevel@tonic-gate 404*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 405*0Sstevel@tonic-gate return (err); 406*0Sstevel@tonic-gate } 407*0Sstevel@tonic-gate 408*0Sstevel@tonic-gate static int 409*0Sstevel@tonic-gate iwscnread(dev_t dev, uio_t *uio, cred_t *cred) 410*0Sstevel@tonic-gate { 411*0Sstevel@tonic-gate wcd_data_t *wd; 412*0Sstevel@tonic-gate int error; 413*0Sstevel@tonic-gate 414*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 415*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 416*0Sstevel@tonic-gate error = strread(wd->wd_list->wl_vp, uio, cred); 417*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 418*0Sstevel@tonic-gate return (error); 419*0Sstevel@tonic-gate } 420*0Sstevel@tonic-gate 421*0Sstevel@tonic-gate static int 422*0Sstevel@tonic-gate iwscnwrite(dev_t dev, uio_t *uio, cred_t *cred) 423*0Sstevel@tonic-gate { 424*0Sstevel@tonic-gate wcd_data_t *wd; 425*0Sstevel@tonic-gate int error; 426*0Sstevel@tonic-gate 427*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 428*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 429*0Sstevel@tonic-gate error = strwrite(wd->wd_list->wl_vp, uio, cred); 430*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 431*0Sstevel@tonic-gate return (error); 432*0Sstevel@tonic-gate } 433*0Sstevel@tonic-gate 434*0Sstevel@tonic-gate static int 435*0Sstevel@tonic-gate iwscnioctl(dev_t dev, int cmd, intptr_t arg, int flag, 436*0Sstevel@tonic-gate cred_t *cred, int *rvalp) 437*0Sstevel@tonic-gate { 438*0Sstevel@tonic-gate wcd_data_t *wd; 439*0Sstevel@tonic-gate int err = 0; 440*0Sstevel@tonic-gate file_t *f; 441*0Sstevel@tonic-gate 442*0Sstevel@tonic-gate switch (cmd) { 443*0Sstevel@tonic-gate case SRIOCSREDIR: { 444*0Sstevel@tonic-gate wcrlist_t *wlp; 445*0Sstevel@tonic-gate wcm_data_t *mdp; 446*0Sstevel@tonic-gate 447*0Sstevel@tonic-gate if (!rw_tryenter(&iwscn_lock, RW_WRITER)) { 448*0Sstevel@tonic-gate return (EBUSY); 449*0Sstevel@tonic-gate } 450*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 451*0Sstevel@tonic-gate /* 452*0Sstevel@tonic-gate * Find the vnode corresponding to the file descriptor 453*0Sstevel@tonic-gate * argument and verify that it names a stream. 454*0Sstevel@tonic-gate */ 455*0Sstevel@tonic-gate if ((f = getf((int)arg)) == NULL) { 456*0Sstevel@tonic-gate err = EBADF; 457*0Sstevel@tonic-gate break; 458*0Sstevel@tonic-gate } 459*0Sstevel@tonic-gate if (f->f_vnode->v_stream == NULL) { 460*0Sstevel@tonic-gate err = ENOSTR; 461*0Sstevel@tonic-gate releasef((int)arg); 462*0Sstevel@tonic-gate break; 463*0Sstevel@tonic-gate } 464*0Sstevel@tonic-gate /* 465*0Sstevel@tonic-gate * allocate the private data for redirmod, and pass it through 466*0Sstevel@tonic-gate * a global to wcmopen(). This is all protected by iwscn_lock. 467*0Sstevel@tonic-gate */ 468*0Sstevel@tonic-gate mdp = kmem_alloc(sizeof (*mdp), KM_SLEEP); 469*0Sstevel@tonic-gate iwscn_wcm_data = mdp; 470*0Sstevel@tonic-gate iwscn_thread = curthread; 471*0Sstevel@tonic-gate 472*0Sstevel@tonic-gate /* 473*0Sstevel@tonic-gate * Push a new instance of the redirecting module onto the 474*0Sstevel@tonic-gate * stream, so that its close routine can notify us when the 475*0Sstevel@tonic-gate * overall stream is closed. (In turn, we'll then remove it 476*0Sstevel@tonic-gate * from the redirection list.) 477*0Sstevel@tonic-gate */ 478*0Sstevel@tonic-gate if ((err = VOP_IOCTL(f->f_vnode, I_PUSH, (intptr_t)"redirmod", 479*0Sstevel@tonic-gate (FREAD | FKIOCTL), cred, rvalp)) != 0) { 480*0Sstevel@tonic-gate iwscn_thread = NULL; 481*0Sstevel@tonic-gate kmem_free(mdp, sizeof (*mdp)); 482*0Sstevel@tonic-gate releasef((int)arg); 483*0Sstevel@tonic-gate break; 484*0Sstevel@tonic-gate } 485*0Sstevel@tonic-gate iwscn_thread = NULL; /* clear authorization for wcmopen() */ 486*0Sstevel@tonic-gate 487*0Sstevel@tonic-gate /* 488*0Sstevel@tonic-gate * Push it onto the redirection stack. 489*0Sstevel@tonic-gate */ 490*0Sstevel@tonic-gate wlp = srpush(&wd->wd_list, f->f_vnode); 491*0Sstevel@tonic-gate /* 492*0Sstevel@tonic-gate * Fill in the redirecting module instance's private data with 493*0Sstevel@tonic-gate * information to let it get to our redirection list when its 494*0Sstevel@tonic-gate * close routine is called. Cross-link it with the 495*0Sstevel@tonic-gate * redirection list entry. 496*0Sstevel@tonic-gate */ 497*0Sstevel@tonic-gate mdp->wm_wd = wd; 498*0Sstevel@tonic-gate mdp->wm_entry = wlp; 499*0Sstevel@tonic-gate wlp->wl_data = mdp; 500*0Sstevel@tonic-gate releasef((int)arg); 501*0Sstevel@tonic-gate 502*0Sstevel@tonic-gate break; 503*0Sstevel@tonic-gate } 504*0Sstevel@tonic-gate 505*0Sstevel@tonic-gate case SRIOCISREDIR: 506*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 507*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 508*0Sstevel@tonic-gate if ((f = getf((int)arg)) == NULL) { 509*0Sstevel@tonic-gate err = EBADF; 510*0Sstevel@tonic-gate break; 511*0Sstevel@tonic-gate } 512*0Sstevel@tonic-gate /* 513*0Sstevel@tonic-gate * Return value is 1 if the argument descriptor is the current 514*0Sstevel@tonic-gate * redirection target, and 0 otherwise. 515*0Sstevel@tonic-gate */ 516*0Sstevel@tonic-gate *rvalp = (f->f_vnode == wd->wd_list->wl_vp) ? 1 : 0; 517*0Sstevel@tonic-gate releasef((int)arg); 518*0Sstevel@tonic-gate break; 519*0Sstevel@tonic-gate 520*0Sstevel@tonic-gate case I_POP: { 521*0Sstevel@tonic-gate /* 522*0Sstevel@tonic-gate * XXX - This is a big kludge the handles a deadlock case 523*0Sstevel@tonic-gate * when we are trying to pop off the redirection 524*0Sstevel@tonic-gate * module. Since this should only happen on a close 525*0Sstevel@tonic-gate * of the device, and since it hangs the system, just 526*0Sstevel@tonic-gate * do not allow a pop of the redirection module to happen. 527*0Sstevel@tonic-gate * Popping other modules is allowed. 528*0Sstevel@tonic-gate */ 529*0Sstevel@tonic-gate struct stdata *stp; 530*0Sstevel@tonic-gate char modname[FMNAMESZ + 1] = " "; 531*0Sstevel@tonic-gate 532*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 533*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 534*0Sstevel@tonic-gate (void) strioctl(wd->wd_list->wl_vp, I_LOOK, (intptr_t)modname, 535*0Sstevel@tonic-gate flag, K_TO_K, cred, rvalp); 536*0Sstevel@tonic-gate if (strcmp("redirmod", modname) == 0) { 537*0Sstevel@tonic-gate if ((f = getf((int)arg)) == NULL) { 538*0Sstevel@tonic-gate err = EBADF; 539*0Sstevel@tonic-gate break; 540*0Sstevel@tonic-gate } 541*0Sstevel@tonic-gate if ((stp = f->f_vnode->v_stream) == NULL) { 542*0Sstevel@tonic-gate err = ENOSTR; 543*0Sstevel@tonic-gate releasef((int)arg); 544*0Sstevel@tonic-gate break; 545*0Sstevel@tonic-gate } 546*0Sstevel@tonic-gate if (!(stp->sd_flag & STRCLOSE)) { 547*0Sstevel@tonic-gate releasef((int)arg); 548*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 549*0Sstevel@tonic-gate cmn_err(CE_WARN, "Popping of redirection " 550*0Sstevel@tonic-gate "module not allowed"); 551*0Sstevel@tonic-gate return (EINVAL); 552*0Sstevel@tonic-gate } 553*0Sstevel@tonic-gate 554*0Sstevel@tonic-gate releasef((int)arg); 555*0Sstevel@tonic-gate } 556*0Sstevel@tonic-gate 557*0Sstevel@tonic-gate /* Process ioctl normally */ 558*0Sstevel@tonic-gate err = strioctl(wd->wd_list->wl_vp, cmd, arg, flag, U_TO_K, 559*0Sstevel@tonic-gate cred, rvalp); 560*0Sstevel@tonic-gate break; 561*0Sstevel@tonic-gate } 562*0Sstevel@tonic-gate 563*0Sstevel@tonic-gate default: 564*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 565*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 566*0Sstevel@tonic-gate err = strioctl(wd->wd_list->wl_vp, cmd, arg, flag, U_TO_K, 567*0Sstevel@tonic-gate cred, rvalp); 568*0Sstevel@tonic-gate break; 569*0Sstevel@tonic-gate } 570*0Sstevel@tonic-gate 571*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 572*0Sstevel@tonic-gate return (err); 573*0Sstevel@tonic-gate } 574*0Sstevel@tonic-gate 575*0Sstevel@tonic-gate static int 576*0Sstevel@tonic-gate iwscnpoll( 577*0Sstevel@tonic-gate dev_t dev, 578*0Sstevel@tonic-gate short events, 579*0Sstevel@tonic-gate int anyyet, 580*0Sstevel@tonic-gate short *reventsp, 581*0Sstevel@tonic-gate struct pollhead **phpp) 582*0Sstevel@tonic-gate { 583*0Sstevel@tonic-gate wcd_data_t *wd; 584*0Sstevel@tonic-gate int error; 585*0Sstevel@tonic-gate 586*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_READER); 587*0Sstevel@tonic-gate wd = srilookup(getminor(dev)); 588*0Sstevel@tonic-gate error = strpoll(wd->wd_list->wl_vp->v_stream, events, anyyet, 589*0Sstevel@tonic-gate reventsp, phpp); 590*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 591*0Sstevel@tonic-gate return (error); 592*0Sstevel@tonic-gate } 593*0Sstevel@tonic-gate 594*0Sstevel@tonic-gate 595*0Sstevel@tonic-gate /* 596*0Sstevel@tonic-gate * Auxiliary routines. 597*0Sstevel@tonic-gate */ 598*0Sstevel@tonic-gate 599*0Sstevel@tonic-gate /* 600*0Sstevel@tonic-gate * Additional public interfaces. 601*0Sstevel@tonic-gate */ 602*0Sstevel@tonic-gate 603*0Sstevel@tonic-gate /* 604*0Sstevel@tonic-gate * Reset the current workstation console designee to the device denoted by the 605*0Sstevel@tonic-gate * wl_vp field of the first entry in the redirection list. Called from 606*0Sstevel@tonic-gate * iwscnopen and from the SRIOCSREDIR case of iwscnioctl, in both cases after 607*0Sstevel@tonic-gate * the target vp has been set to its new value. 608*0Sstevel@tonic-gate */ 609*0Sstevel@tonic-gate static int 610*0Sstevel@tonic-gate srreset(wcd_data_t *wd, int flag, cred_t *cred) 611*0Sstevel@tonic-gate { 612*0Sstevel@tonic-gate wcrlist_t *wlp; 613*0Sstevel@tonic-gate int err = 0; 614*0Sstevel@tonic-gate 615*0Sstevel@tonic-gate ASSERT(RW_WRITE_HELD(&iwscn_lock) || MUTEX_HELD(&iwscn_open_lock)); 616*0Sstevel@tonic-gate wlp = wd->wd_list; /* first entry */ 617*0Sstevel@tonic-gate 618*0Sstevel@tonic-gate /* 619*0Sstevel@tonic-gate * If we're reverting back to the workstation console, make sure it's 620*0Sstevel@tonic-gate * open. 621*0Sstevel@tonic-gate */ 622*0Sstevel@tonic-gate if (wlp != NULL && wlp->wl_vp == wd->wd_vp) { 623*0Sstevel@tonic-gate vnode_t *vp = wd->wd_vp; /* underlying device's vp */ 624*0Sstevel@tonic-gate 625*0Sstevel@tonic-gate err = VOP_OPEN(&vp, flag, cred); 626*0Sstevel@tonic-gate /* 627*0Sstevel@tonic-gate * The underlying driver is not allowed to have cloned itself 628*0Sstevel@tonic-gate * for this open. 629*0Sstevel@tonic-gate */ 630*0Sstevel@tonic-gate if (vp != wd->wd_vp) { 631*0Sstevel@tonic-gate panic("srreset: Illegal clone"); 632*0Sstevel@tonic-gate /*NOTREACHED*/ 633*0Sstevel@tonic-gate } 634*0Sstevel@tonic-gate if (!err) 635*0Sstevel@tonic-gate wd->wd_wsconsopen++; 636*0Sstevel@tonic-gate } 637*0Sstevel@tonic-gate return (err); 638*0Sstevel@tonic-gate } 639*0Sstevel@tonic-gate 640*0Sstevel@tonic-gate /* 641*0Sstevel@tonic-gate * Remove vp from the redirection list rooted at *rwlp, should it be there. 642*0Sstevel@tonic-gate * If zap is nonzero, deallocate the entry and remove dangling references to 643*0Sstevel@tonic-gate * the it from the corresponding redirecting module instance's wcm_data 644*0Sstevel@tonic-gate * structure. 645*0Sstevel@tonic-gate * 646*0Sstevel@tonic-gate * If the entry doesn't exist upon completion, return NULL; otherwise return a 647*0Sstevel@tonic-gate * pointer to it. 648*0Sstevel@tonic-gate */ 649*0Sstevel@tonic-gate static wcrlist_t * 650*0Sstevel@tonic-gate srrm(wcrlist_t **rwlp, vnode_t *vp, int zap) 651*0Sstevel@tonic-gate { 652*0Sstevel@tonic-gate wcrlist_t **delwlp; 653*0Sstevel@tonic-gate wcrlist_t *wlp; 654*0Sstevel@tonic-gate wcm_data_t *mdp; 655*0Sstevel@tonic-gate 656*0Sstevel@tonic-gate ASSERT(RW_WRITE_HELD(&iwscn_lock) || MUTEX_HELD(&iwscn_open_lock)); 657*0Sstevel@tonic-gate for (delwlp = rwlp; (wlp = *delwlp) != NULL; delwlp = &wlp->wl_next) 658*0Sstevel@tonic-gate if (wlp->wl_vp == vp) 659*0Sstevel@tonic-gate break; 660*0Sstevel@tonic-gate if (wlp == NULL) 661*0Sstevel@tonic-gate return (NULL); 662*0Sstevel@tonic-gate *delwlp = wlp->wl_next; 663*0Sstevel@tonic-gate 664*0Sstevel@tonic-gate if (zap == 0) 665*0Sstevel@tonic-gate return (wlp); 666*0Sstevel@tonic-gate 667*0Sstevel@tonic-gate if (wlp->wl_vp == vp) 668*0Sstevel@tonic-gate VN_RELE(vp); 669*0Sstevel@tonic-gate /* 670*0Sstevel@tonic-gate * Make sure there are no dangling references leading to the entry 671*0Sstevel@tonic-gate * from the corresponding redirecting module instance. 672*0Sstevel@tonic-gate */ 673*0Sstevel@tonic-gate if ((mdp = wlp->wl_data) != NULL) { 674*0Sstevel@tonic-gate mdp->wm_wd = NULL; 675*0Sstevel@tonic-gate mdp->wm_entry = NULL; 676*0Sstevel@tonic-gate } 677*0Sstevel@tonic-gate 678*0Sstevel@tonic-gate kmem_free(wlp, sizeof (*wlp)); 679*0Sstevel@tonic-gate return (NULL); 680*0Sstevel@tonic-gate } 681*0Sstevel@tonic-gate 682*0Sstevel@tonic-gate /* 683*0Sstevel@tonic-gate * srpop - remove redirection because the target stream is being closed. 684*0Sstevel@tonic-gate * Called from wcmclose(). 685*0Sstevel@tonic-gate */ 686*0Sstevel@tonic-gate void 687*0Sstevel@tonic-gate srpop(wcm_data_t *mdp, int flag, cred_t *cred) 688*0Sstevel@tonic-gate { 689*0Sstevel@tonic-gate wcd_data_t *ddp; 690*0Sstevel@tonic-gate 691*0Sstevel@tonic-gate rw_enter(&iwscn_lock, RW_WRITER); 692*0Sstevel@tonic-gate if ((ddp = mdp->wm_wd) != NULL) { 693*0Sstevel@tonic-gate ASSERT(mdp->wm_entry != NULL); 694*0Sstevel@tonic-gate (void) srrm(&ddp->wd_list, mdp->wm_entry->wl_vp, 1); 695*0Sstevel@tonic-gate (void) srreset(ddp, flag, cred); 696*0Sstevel@tonic-gate } 697*0Sstevel@tonic-gate rw_exit(&iwscn_lock); 698*0Sstevel@tonic-gate } 699*0Sstevel@tonic-gate 700*0Sstevel@tonic-gate /* 701*0Sstevel@tonic-gate * Routines for allocating, deallocating, and finding wcd_data structures. 702*0Sstevel@tonic-gate * 703*0Sstevel@tonic-gate * For a given instantiation of the driver, its open instance structures are 704*0Sstevel@tonic-gate * linked together into a list, on the assumption that there will never be 705*0Sstevel@tonic-gate * enough open instances to make search efficiency a serious concern. 706*0Sstevel@tonic-gate */ 707*0Sstevel@tonic-gate 708*0Sstevel@tonic-gate /* 709*0Sstevel@tonic-gate * Look up the instance structure denoted by unit. 710*0Sstevel@tonic-gate */ 711*0Sstevel@tonic-gate static wcd_data_t * 712*0Sstevel@tonic-gate srilookup(minor_t unit) 713*0Sstevel@tonic-gate { 714*0Sstevel@tonic-gate wcd_data_t *wd = wcddata; 715*0Sstevel@tonic-gate 716*0Sstevel@tonic-gate ASSERT(RW_LOCK_HELD(&iwscn_lock)); 717*0Sstevel@tonic-gate for (; wd != NULL && wd->wd_unit != unit; wd = wd->wd_next) 718*0Sstevel@tonic-gate continue; 719*0Sstevel@tonic-gate 720*0Sstevel@tonic-gate return (wd); 721*0Sstevel@tonic-gate } 722*0Sstevel@tonic-gate 723*0Sstevel@tonic-gate /* 724*0Sstevel@tonic-gate * Allocate a wcd_data structure for the instance denoted by unit, link it in 725*0Sstevel@tonic-gate * place, and return a pointer to it. If it's already allocated, simply 726*0Sstevel@tonic-gate * return a pointer to it. 727*0Sstevel@tonic-gate */ 728*0Sstevel@tonic-gate static wcd_data_t * 729*0Sstevel@tonic-gate srialloc(minor_t unit) 730*0Sstevel@tonic-gate { 731*0Sstevel@tonic-gate wcd_data_t *wdp; 732*0Sstevel@tonic-gate wcd_data_t **wdpp; 733*0Sstevel@tonic-gate 734*0Sstevel@tonic-gate ASSERT(MUTEX_HELD(&iwscn_open_lock)); 735*0Sstevel@tonic-gate for (wdpp = &wcddata; (wdp = *wdpp) != NULL; wdpp = &wdp->wd_next) { 736*0Sstevel@tonic-gate if (unit < wdp->wd_unit) 737*0Sstevel@tonic-gate break; 738*0Sstevel@tonic-gate if (unit == wdp->wd_unit) { 739*0Sstevel@tonic-gate /* Already allocated and in place. */ 740*0Sstevel@tonic-gate return (wdp); 741*0Sstevel@tonic-gate } 742*0Sstevel@tonic-gate } 743*0Sstevel@tonic-gate /* 744*0Sstevel@tonic-gate * wdpp now points to the proper insertion point for unit's 745*0Sstevel@tonic-gate * per-instance structure. 746*0Sstevel@tonic-gate */ 747*0Sstevel@tonic-gate wdp = kmem_zalloc(sizeof (*wdp), KM_SLEEP); 748*0Sstevel@tonic-gate wdp->wd_unit = unit; 749*0Sstevel@tonic-gate wdp->wd_next = *wdpp; 750*0Sstevel@tonic-gate *wdpp = wdp; 751*0Sstevel@tonic-gate 752*0Sstevel@tonic-gate return (wdp); 753*0Sstevel@tonic-gate } 754*0Sstevel@tonic-gate 755*0Sstevel@tonic-gate /* 756*0Sstevel@tonic-gate * Deallocate the wcd_data structure denoted by wd and unlink it from the 757*0Sstevel@tonic-gate * list of open instances. 758*0Sstevel@tonic-gate */ 759*0Sstevel@tonic-gate static void 760*0Sstevel@tonic-gate sridealloc(wcd_data_t *wd) 761*0Sstevel@tonic-gate { 762*0Sstevel@tonic-gate wcd_data_t *wdp; 763*0Sstevel@tonic-gate wcd_data_t **wdpp; 764*0Sstevel@tonic-gate 765*0Sstevel@tonic-gate ASSERT(RW_WRITE_HELD(&iwscn_lock) || MUTEX_HELD(&iwscn_open_lock)); 766*0Sstevel@tonic-gate for (wdpp = &wcddata; (wdp = *wdpp) != NULL; wdpp = &wdp->wd_next) 767*0Sstevel@tonic-gate if (wd == wdp) 768*0Sstevel@tonic-gate break; 769*0Sstevel@tonic-gate if (wdp == NULL) { 770*0Sstevel@tonic-gate /* 771*0Sstevel@tonic-gate * Not there. This should probably be a panic. 772*0Sstevel@tonic-gate */ 773*0Sstevel@tonic-gate return; 774*0Sstevel@tonic-gate } 775*0Sstevel@tonic-gate *wdpp = wdp->wd_next; 776*0Sstevel@tonic-gate kmem_free(wdp, sizeof (*wdp)); 777*0Sstevel@tonic-gate } 778*0Sstevel@tonic-gate 779*0Sstevel@tonic-gate 780*0Sstevel@tonic-gate /* 781*0Sstevel@tonic-gate * Push vp onto the redirection list rooted at *wlpp. If it's already there, 782*0Sstevel@tonic-gate * move it to the front position. Return a pointer to its list entry. 783*0Sstevel@tonic-gate * 784*0Sstevel@tonic-gate * N.B.: It is the caller's responsibility to initialize all fields in the 785*0Sstevel@tonic-gate * entry other than the wl_next and wl_vp fields. 786*0Sstevel@tonic-gate */ 787*0Sstevel@tonic-gate static wcrlist_t * 788*0Sstevel@tonic-gate srpush(wcrlist_t **wlpp, vnode_t *vp) 789*0Sstevel@tonic-gate { 790*0Sstevel@tonic-gate wcrlist_t *nwlp; 791*0Sstevel@tonic-gate 792*0Sstevel@tonic-gate ASSERT(RW_WRITE_HELD(&iwscn_lock) || MUTEX_HELD(&iwscn_open_lock)); 793*0Sstevel@tonic-gate if ((nwlp = srrm(wlpp, vp, 0)) == NULL) { 794*0Sstevel@tonic-gate nwlp = kmem_zalloc(sizeof (*nwlp), KM_SLEEP); 795*0Sstevel@tonic-gate nwlp->wl_vp = vp; 796*0Sstevel@tonic-gate /* 797*0Sstevel@tonic-gate * The hold will prevent underlying device from closing 798*0Sstevel@tonic-gate * while this vnode is still on the redirection list. 799*0Sstevel@tonic-gate */ 800*0Sstevel@tonic-gate VN_HOLD(vp); 801*0Sstevel@tonic-gate } 802*0Sstevel@tonic-gate nwlp->wl_next = *wlpp; 803*0Sstevel@tonic-gate *wlpp = nwlp; 804*0Sstevel@tonic-gate 805*0Sstevel@tonic-gate return (nwlp); 806*0Sstevel@tonic-gate } 807