devfs_devs.c revision 172930
1139776Simp/*- 2130678Sphk * Copyright (c) 2000,2004 364880Sphk * Poul-Henning Kamp. All rights reserved. 464880Sphk * 564880Sphk * Redistribution and use in source and binary forms, with or without 664880Sphk * modification, are permitted provided that the following conditions 764880Sphk * are met: 864880Sphk * 1. Redistributions of source code must retain the above copyright 964880Sphk * notice, this list of conditions and the following disclaimer. 1064880Sphk * 2. Neither the name of the University nor the names of its contributors 1164880Sphk * may be used to endorse or promote products derived from this software 1264880Sphk * without specific prior written permission. 1364880Sphk * 1464880Sphk * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1564880Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1664880Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1764880Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 1864880Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1964880Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2064880Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2164880Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2264880Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2364880Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2464880Sphk * SUCH DAMAGE. 2564880Sphk * 2664880Sphk * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36 2764880Sphk * 2864880Sphk * $FreeBSD: head/sys/fs/devfs/devfs_devs.c 172930 2007-10-24 19:04:04Z rwatson $ 2964880Sphk */ 3064880Sphk 31101069Srwatson#include "opt_mac.h" 3265515Sphk 3364880Sphk#include <sys/param.h> 3464880Sphk#include <sys/systm.h> 3576166Smarkm#include <sys/conf.h> 3664880Sphk#include <sys/dirent.h> 3776166Smarkm#include <sys/kernel.h> 38150342Sphk#include <sys/limits.h> 3976166Smarkm#include <sys/lock.h> 4064880Sphk#include <sys/malloc.h> 4176166Smarkm#include <sys/proc.h> 42150342Sphk#include <sys/sx.h> 4365515Sphk#include <sys/sysctl.h> 4476166Smarkm#include <sys/vnode.h> 4564880Sphk 46150342Sphk#include <sys/kdb.h> 4765515Sphk 4864880Sphk#include <fs/devfs/devfs.h> 49149144Sphk#include <fs/devfs/devfs_int.h> 5064880Sphk 51163606Srwatson#include <security/mac/mac_framework.h> 52163606Srwatson 53150342Sphk/* 54150342Sphk * The one true (but secret) list of active devices in the system. 55150342Sphk * Locked by dev_lock()/devmtx 56150342Sphk */ 57163481Skibstruct cdev_priv_list cdevp_list = TAILQ_HEAD_INITIALIZER(cdevp_list); 5865515Sphk 59150342Sphkstruct unrhdr *devfs_inos; 6069767Sphk 61150342Sphk 62150342Sphkstatic MALLOC_DEFINE(M_DEVFS2, "DEVFS2", "DEVFS data 2"); 63150342Sphkstatic MALLOC_DEFINE(M_DEVFS3, "DEVFS3", "DEVFS data 3"); 64150342Sphkstatic MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage"); 65150342Sphk 66141633Sphkstatic SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem"); 67150342Sphk 68150342Sphkstatic unsigned devfs_generation; 6965515SphkSYSCTL_UINT(_vfs_devfs, OID_AUTO, generation, CTLFLAG_RD, 7065515Sphk &devfs_generation, 0, "DEVFS generation number"); 7165515Sphk 72150147Sphkunsigned devfs_rule_depth = 1; 73150147SphkSYSCTL_UINT(_vfs_devfs, OID_AUTO, rule_depth, CTLFLAG_RW, 74150342Sphk &devfs_rule_depth, 0, "Max depth of ruleset include"); 75150147Sphk 76149146Sphk/* 77149146Sphk * Helper sysctl for devname(3). We're given a struct cdev * and return 78149146Sphk * the name, if any, registered by the device driver. 79149146Sphk */ 80149146Sphkstatic int 81149146Sphksysctl_devname(SYSCTL_HANDLER_ARGS) 82149146Sphk{ 83149146Sphk int error; 84149146Sphk dev_t ud; 85150342Sphk struct cdev_priv *cdp; 86149146Sphk 87149146Sphk error = SYSCTL_IN(req, &ud, sizeof (ud)); 88149146Sphk if (error) 89149146Sphk return (error); 90149146Sphk if (ud == NODEV) 91149146Sphk return(EINVAL); 92150342Sphk/* 93150342Sphk ud ^ devfs_random(); 94150342Sphk*/ 95150342Sphk dev_lock(); 96150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) 97150342Sphk if (cdp->cdp_inode == ud) 98150342Sphk break; 99150342Sphk dev_unlock(); 100150342Sphk if (cdp == NULL) 101149146Sphk return(ENOENT); 102150342Sphk return(SYSCTL_OUT(req, cdp->cdp_c.si_name, strlen(cdp->cdp_c.si_name) + 1)); 103149146Sphk return (error); 104149146Sphk} 105149146Sphk 106149146SphkSYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 107149146Sphk NULL, 0, sysctl_devname, "", "devname(3) handler"); 108149146Sphk 109149146SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 110149146Sphk 0, sizeof(struct cdev), "sizeof(struct cdev)"); 111149146Sphk 112150342SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, cdev_priv, CTLFLAG_RD, 113150342Sphk 0, sizeof(struct cdev_priv), "sizeof(struct cdev_priv)"); 11465515Sphk 115150342Sphkstruct cdev * 116150342Sphkdevfs_alloc(void) 11765515Sphk{ 118150342Sphk struct cdev_priv *cdp; 119150342Sphk struct cdev *cdev; 12065515Sphk 121150342Sphk cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO | M_WAITOK); 12265515Sphk 123150342Sphk cdp->cdp_dirents = &cdp->cdp_dirent0; 124150342Sphk cdp->cdp_dirent0 = NULL; 125150342Sphk cdp->cdp_maxdirent = 0; 12665515Sphk 127150342Sphk cdev = &cdp->cdp_c; 128150342Sphk cdev->si_priv = cdp; 12965515Sphk 130150342Sphk cdev->si_name = cdev->__si_namebuf; 131150342Sphk LIST_INIT(&cdev->si_children); 132150342Sphk return (cdev); 13365515Sphk} 13465515Sphk 135150342Sphkvoid 136150342Sphkdevfs_free(struct cdev *cdev) 13765515Sphk{ 138150342Sphk struct cdev_priv *cdp; 13965515Sphk 140150342Sphk cdp = cdev->si_priv; 141150342Sphk if (cdev->si_cred != NULL) 142150342Sphk crfree(cdev->si_cred); 143150342Sphk if (cdp->cdp_inode > 0) 144150342Sphk free_unr(devfs_inos, cdp->cdp_inode); 145150342Sphk if (cdp->cdp_maxdirent > 0) 146150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 147150342Sphk free(cdp, M_CDEVP); 14865515Sphk} 14965515Sphk 150150342Sphkstruct devfs_dirent * 15165132Sphkdevfs_find(struct devfs_dirent *dd, const char *name, int namelen) 15265132Sphk{ 15365132Sphk struct devfs_dirent *de; 15465132Sphk 15565132Sphk TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 15665132Sphk if (namelen != de->de_dirent->d_namlen) 15765132Sphk continue; 15865132Sphk if (bcmp(name, de->de_dirent->d_name, namelen) != 0) 15965132Sphk continue; 16065132Sphk break; 16165132Sphk } 16265132Sphk return (de); 16365132Sphk} 16465132Sphk 16565132Sphkstruct devfs_dirent * 16664880Sphkdevfs_newdirent(char *name, int namelen) 16764880Sphk{ 16864880Sphk int i; 16964880Sphk struct devfs_dirent *de; 17064880Sphk struct dirent d; 17164880Sphk 17264880Sphk d.d_namlen = namelen; 173150342Sphk i = sizeof (*de) + GENERIC_DIRSIZ(&d); 174150342Sphk de = malloc(i, M_DEVFS3, M_WAITOK | M_ZERO); 17564880Sphk de->de_dirent = (struct dirent *)(de + 1); 17664880Sphk de->de_dirent->d_namlen = namelen; 17764880Sphk de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d); 17871822Sphk bcopy(name, de->de_dirent->d_name, namelen); 17971822Sphk de->de_dirent->d_name[namelen] = '\0'; 18085979Sphk vfs_timestamp(&de->de_ctime); 18165051Sphk de->de_mtime = de->de_atime = de->de_ctime; 18265051Sphk de->de_links = 1; 183162398Skib de->de_holdcnt = 1; 184101069Srwatson#ifdef MAC 185172930Srwatson mac_devfs_init(de); 186101069Srwatson#endif 18764880Sphk return (de); 18864880Sphk} 18964880Sphk 19065051Sphkstruct devfs_dirent * 191150342Sphkdevfs_vmkdir(struct devfs_mount *dmp, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode) 19264880Sphk{ 19365051Sphk struct devfs_dirent *dd; 19464880Sphk struct devfs_dirent *de; 19564880Sphk 196150342Sphk /* Create the new directory */ 19765051Sphk dd = devfs_newdirent(name, namelen); 19865051Sphk TAILQ_INIT(&dd->de_dlist); 19965051Sphk dd->de_dirent->d_type = DT_DIR; 20085979Sphk dd->de_mode = 0555; 20165051Sphk dd->de_links = 2; 20265051Sphk dd->de_dir = dd; 203150342Sphk if (inode != 0) 204150342Sphk dd->de_inode = inode; 205150342Sphk else 206150342Sphk dd->de_inode = alloc_unr(devfs_inos); 20765051Sphk 208150342Sphk /* Create the "." entry in the new directory */ 20964880Sphk de = devfs_newdirent(".", 1); 21064880Sphk de->de_dirent->d_type = DT_DIR; 21165051Sphk de->de_flags |= DE_DOT; 21265051Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 213150342Sphk de->de_dir = dd; 21465051Sphk 215150342Sphk /* Create the ".." entry in the new directory */ 21665051Sphk de = devfs_newdirent("..", 2); 21765051Sphk de->de_dirent->d_type = DT_DIR; 218150342Sphk de->de_flags |= DE_DOTDOT; 219150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 220150342Sphk if (dotdot == NULL) { 22165051Sphk de->de_dir = dd; 222150342Sphk } else { 22365051Sphk de->de_dir = dotdot; 224150342Sphk TAILQ_INSERT_TAIL(&dotdot->de_dlist, dd, de_list); 225150342Sphk dotdot->de_links++; 226150342Sphk } 22765051Sphk 228150342Sphk#ifdef MAC 229172930Srwatson mac_devfs_create_directory(dmp->dm_mount, name, namelen, dd); 230150342Sphk#endif 23164880Sphk return (dd); 23264880Sphk} 23364880Sphk 234150342Sphkvoid 235162398Skibdevfs_dirent_free(struct devfs_dirent *de) 236162398Skib{ 237162398Skib free(de, M_DEVFS3); 238162398Skib} 239162398Skib 240163481Skib/* 241163481Skib * The caller needs to hold the dm for the duration of the call since 242163481Skib * dm->dm_lock may be temporary dropped. 243163481Skib */ 244162398Skibvoid 245163481Skibdevfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int vp_locked) 24664880Sphk{ 247163481Skib struct vnode *vp; 248163481Skib struct thread *td; 24964880Sphk 250162398Skib KASSERT((de->de_flags & DE_DOOMED) == 0, 251162398Skib ("devfs_delete doomed dirent")); 252163481Skib td = curthread; 253162398Skib de->de_flags |= DE_DOOMED; 254163481Skib mtx_lock(&devfs_de_interlock); 255163481Skib vp = de->de_vnode; 256163481Skib if (vp != NULL) { 257163481Skib VI_LOCK(vp); 258163481Skib mtx_unlock(&devfs_de_interlock); 259163481Skib vholdl(vp); 260163481Skib sx_unlock(&dm->dm_lock); 261163481Skib if (!vp_locked) 262163481Skib vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, td); 263163481Skib else 264163481Skib VI_UNLOCK(vp); 265163481Skib vgone(vp); 266163481Skib if (!vp_locked) 267163481Skib VOP_UNLOCK(vp, 0, td); 268163481Skib vdrop(vp); 269163481Skib sx_xlock(&dm->dm_lock); 270163481Skib } else 271163481Skib mtx_unlock(&devfs_de_interlock); 27264880Sphk if (de->de_symlink) { 273150151Sphk free(de->de_symlink, M_DEVFS); 27464880Sphk de->de_symlink = NULL; 27564880Sphk } 276101069Srwatson#ifdef MAC 277172930Srwatson mac_devfs_destroy(de); 278101069Srwatson#endif 279150342Sphk if (de->de_inode > DEVFS_ROOTINO) { 280150342Sphk free_unr(devfs_inos, de->de_inode); 281150342Sphk de->de_inode = 0; 282150342Sphk } 283162398Skib if (DEVFS_DE_DROP(de)) 284162398Skib devfs_dirent_free(de); 28564880Sphk} 28664880Sphk 287150342Sphk/* 288150342Sphk * Called on unmount. 289163481Skib * Recursively removes the entire tree. 290163481Skib * The caller needs to hold the dm for the duration of the call. 291150342Sphk */ 292150342Sphk 293150342Sphkstatic void 294150342Sphkdevfs_purge(struct devfs_mount *dm, struct devfs_dirent *dd) 29564880Sphk{ 29664880Sphk struct devfs_dirent *de; 29764880Sphk 298150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 29964880Sphk for (;;) { 30065051Sphk de = TAILQ_FIRST(&dd->de_dlist); 30164880Sphk if (de == NULL) 30264880Sphk break; 303150342Sphk TAILQ_REMOVE(&dd->de_dlist, de, de_list); 304150342Sphk if (de->de_flags & (DE_DOT|DE_DOTDOT)) 305163481Skib devfs_delete(dm, de, 0); 306150342Sphk else if (de->de_dirent->d_type == DT_DIR) 307150342Sphk devfs_purge(dm, de); 308150342Sphk else 309163481Skib devfs_delete(dm, de, 0); 31064880Sphk } 311163481Skib devfs_delete(dm, dd, 0); 31264880Sphk} 31364880Sphk 314150342Sphk/* 315150342Sphk * Each cdev_priv has an array of pointers to devfs_dirent which is indexed 316150342Sphk * by the mount points dm_idx. 317150342Sphk * This function extends the array when necessary, taking into account that 318150342Sphk * the default array is 1 element and not malloc'ed. 319150342Sphk */ 320150342Sphkstatic void 321150342Sphkdevfs_metoo(struct cdev_priv *cdp, struct devfs_mount *dm) 322150342Sphk{ 323150342Sphk struct devfs_dirent **dep; 324150342Sphk int siz; 32564880Sphk 326150342Sphk siz = (dm->dm_idx + 1) * sizeof *dep; 327150342Sphk dep = malloc(siz, M_DEVFS2, M_WAITOK | M_ZERO); 328150342Sphk dev_lock(); 329150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent) { 330150342Sphk /* We got raced */ 331150342Sphk dev_unlock(); 332150342Sphk free(dep, M_DEVFS2); 333150342Sphk return; 334150342Sphk } 335150342Sphk memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep); 336150342Sphk if (cdp->cdp_maxdirent > 0) 337150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 338150342Sphk cdp->cdp_dirents = dep; 339150342Sphk /* 340150342Sphk * XXX: if malloc told us how much we actually got this could 341150342Sphk * XXX: be optimized. 342150342Sphk */ 343150342Sphk cdp->cdp_maxdirent = dm->dm_idx; 344150342Sphk dev_unlock(); 345150342Sphk} 346150342Sphk 347163481Skib/* 348163481Skib * The caller needs to hold the dm for the duration of the call. 349163481Skib */ 350150342Sphkstatic int 351150342Sphkdevfs_populate_loop(struct devfs_mount *dm, int cleanup) 35264880Sphk{ 353150342Sphk struct cdev_priv *cdp; 354150342Sphk struct devfs_dirent *de; 35565051Sphk struct devfs_dirent *dd; 356150342Sphk struct cdev *pdev; 357150342Sphk int j; 35864880Sphk char *q, *s; 35964880Sphk 360150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 361150342Sphk dev_lock(); 362150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 363150342Sphk 364150342Sphk KASSERT(cdp->cdp_dirents != NULL, ("NULL cdp_dirents")); 365150342Sphk 366150342Sphk /* 367150342Sphk * If we are unmounting, or the device has been destroyed, 368150342Sphk * clean up our dirent. 369150342Sphk */ 370150342Sphk if ((cleanup || !(cdp->cdp_flags & CDP_ACTIVE)) && 371150342Sphk dm->dm_idx <= cdp->cdp_maxdirent && 372150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 373150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 374150342Sphk cdp->cdp_dirents[dm->dm_idx] = NULL; 375150342Sphk KASSERT(cdp == de->de_cdp, 376150342Sphk ("%s %d %s %p %p", __func__, __LINE__, 377150342Sphk cdp->cdp_c.si_name, cdp, de->de_cdp)); 378150342Sphk KASSERT(de->de_dir != NULL, ("Null de->de_dir")); 379150342Sphk dev_unlock(); 380150342Sphk 381150342Sphk TAILQ_REMOVE(&de->de_dir->de_dlist, de, de_list); 382150342Sphk de->de_cdp = NULL; 383150342Sphk de->de_inode = 0; 384163481Skib devfs_delete(dm, de, 0); 385163481Skib dev_lock(); 386163481Skib cdp->cdp_inuse--; 387163481Skib dev_unlock(); 388150342Sphk return (1); 389150342Sphk } 390150342Sphk /* 391150342Sphk * GC any lingering devices 392150342Sphk */ 393150342Sphk if (!(cdp->cdp_flags & CDP_ACTIVE)) { 394150342Sphk if (cdp->cdp_inuse > 0) 39565051Sphk continue; 396150342Sphk TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 397150342Sphk dev_unlock(); 398150342Sphk dev_rel(&cdp->cdp_c); 399150342Sphk return (1); 400150342Sphk } 401150342Sphk /* 402150342Sphk * Don't create any new dirents if we are unmounting 403150342Sphk */ 404150342Sphk if (cleanup) 405150342Sphk continue; 406150342Sphk KASSERT((cdp->cdp_flags & CDP_ACTIVE), ("Bogons, I tell ya'!")); 407150342Sphk 408150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent && 409150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 410150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 411150342Sphk KASSERT(cdp == de->de_cdp, ("inconsistent cdp")); 412150342Sphk continue; 413150342Sphk } 414150342Sphk 415150342Sphk 416150342Sphk cdp->cdp_inuse++; 417150342Sphk dev_unlock(); 418150342Sphk 419150342Sphk if (dm->dm_idx > cdp->cdp_maxdirent) 420150342Sphk devfs_metoo(cdp, dm); 421150342Sphk 422150342Sphk dd = dm->dm_rootdir; 423150342Sphk s = cdp->cdp_c.si_name; 424150342Sphk for (;;) { 425150342Sphk for (q = s; *q != '/' && *q != '\0'; q++) 42664880Sphk continue; 427150342Sphk if (*q != '/') 428150342Sphk break; 429150342Sphk de = devfs_find(dd, s, q - s); 430150342Sphk if (de == NULL) 431150342Sphk de = devfs_vmkdir(dm, s, q - s, dd, 0); 432150342Sphk s = q + 1; 433150342Sphk dd = de; 434150342Sphk } 435150342Sphk 436150342Sphk de = devfs_newdirent(s, q - s); 437150342Sphk if (cdp->cdp_c.si_flags & SI_ALIAS) { 438150342Sphk de->de_uid = 0; 439150342Sphk de->de_gid = 0; 440150342Sphk de->de_mode = 0755; 441150342Sphk de->de_dirent->d_type = DT_LNK; 442150342Sphk pdev = cdp->cdp_c.si_parent; 443150342Sphk j = strlen(pdev->si_name) + 1; 444150342Sphk de->de_symlink = malloc(j, M_DEVFS, M_WAITOK); 445150342Sphk bcopy(pdev->si_name, de->de_symlink, j); 446150342Sphk } else { 447150342Sphk de->de_uid = cdp->cdp_c.si_uid; 448150342Sphk de->de_gid = cdp->cdp_c.si_gid; 449150342Sphk de->de_mode = cdp->cdp_c.si_mode; 450150342Sphk de->de_dirent->d_type = DT_CHR; 451150342Sphk } 452150342Sphk de->de_inode = cdp->cdp_inode; 453150342Sphk de->de_cdp = cdp; 454101069Srwatson#ifdef MAC 455172930Srwatson mac_devfs_create_device(cdp->cdp_c.si_cred, dm->dm_mount, 456150342Sphk &cdp->cdp_c, de); 457101069Srwatson#endif 458150342Sphk de->de_dir = dd; 459150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 460150342Sphk devfs_rules_apply(dm, de); 461150342Sphk dev_lock(); 462150342Sphk /* XXX: could check that cdp is still active here */ 463150342Sphk KASSERT(cdp->cdp_dirents[dm->dm_idx] == NULL, 464150342Sphk ("%s %d\n", __func__, __LINE__)); 465150342Sphk cdp->cdp_dirents[dm->dm_idx] = de; 466150342Sphk KASSERT(de->de_cdp != (void *)0xdeadc0de, 467150342Sphk ("%s %d\n", __func__, __LINE__)); 468150342Sphk dev_unlock(); 469150342Sphk return (1); 47064880Sphk } 471150342Sphk dev_unlock(); 472150342Sphk return (0); 47364880Sphk} 47464880Sphk 475163481Skib/* 476163481Skib * The caller needs to hold the dm for the duration of the call. 477163481Skib */ 478150342Sphkvoid 479150342Sphkdevfs_populate(struct devfs_mount *dm) 480150342Sphk{ 481150342Sphk 482150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 483150342Sphk if (dm->dm_generation == devfs_generation) 484150342Sphk return; 485150342Sphk while (devfs_populate_loop(dm, 0)) 486150342Sphk continue; 487150342Sphk dm->dm_generation = devfs_generation; 488150342Sphk} 489150342Sphk 490163481Skib/* 491163481Skib * The caller needs to hold the dm for the duration of the call. 492163481Skib */ 493150342Sphkvoid 494150342Sphkdevfs_cleanup(struct devfs_mount *dm) 495150342Sphk{ 496150342Sphk 497150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 498150342Sphk while (devfs_populate_loop(dm, 1)) 499150342Sphk continue; 500150342Sphk devfs_purge(dm, dm->dm_rootdir); 501150342Sphk} 502150342Sphk 503130678Sphk/* 504130678Sphk * devfs_create() and devfs_destroy() are called from kern_conf.c and 505130678Sphk * in both cases the devlock() mutex is held, so no further locking 506130678Sphk * is necesary and no sleeping allowed. 507130678Sphk */ 508130678Sphk 509111730Sphkvoid 510130585Sphkdevfs_create(struct cdev *dev) 51164880Sphk{ 512150342Sphk struct cdev_priv *cdp; 51365515Sphk 514150342Sphk mtx_assert(&devmtx, MA_OWNED); 515150342Sphk cdp = dev->si_priv; 516150342Sphk cdp->cdp_flags |= CDP_ACTIVE; 517150342Sphk cdp->cdp_inode = alloc_unrl(devfs_inos); 518150342Sphk dev_refl(dev); 519150342Sphk TAILQ_INSERT_TAIL(&cdevp_list, cdp, cdp_list); 520130678Sphk devfs_generation++; 52164880Sphk} 52264880Sphk 523111730Sphkvoid 524130585Sphkdevfs_destroy(struct cdev *dev) 52564880Sphk{ 526150342Sphk struct cdev_priv *cdp; 52765515Sphk 528150342Sphk mtx_assert(&devmtx, MA_OWNED); 529150342Sphk cdp = dev->si_priv; 530150342Sphk cdp->cdp_flags &= ~CDP_ACTIVE; 531130678Sphk devfs_generation++; 53264880Sphk} 533150342Sphk 534150342Sphkstatic void 535150342Sphkdevfs_devs_init(void *junk __unused) 536150342Sphk{ 537150342Sphk 538150342Sphk devfs_inos = new_unrhdr(DEVFS_ROOTINO + 1, INT_MAX, &devmtx); 539150342Sphk} 540150342Sphk 541150342SphkSYSINIT(devfs_devs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_devs_init, NULL); 542