devfs_devs.c revision 163481
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 163481 2006-10-18 11:17:14Z kib $ 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> 40101069Srwatson#include <sys/mac.h> 4164880Sphk#include <sys/malloc.h> 4276166Smarkm#include <sys/proc.h> 43150342Sphk#include <sys/sx.h> 4465515Sphk#include <sys/sysctl.h> 4576166Smarkm#include <sys/vnode.h> 4664880Sphk 47150342Sphk#include <sys/kdb.h> 4865515Sphk 4964880Sphk#include <fs/devfs/devfs.h> 50149144Sphk#include <fs/devfs/devfs_int.h> 5164880Sphk 52150342Sphk/* 53150342Sphk * The one true (but secret) list of active devices in the system. 54150342Sphk * Locked by dev_lock()/devmtx 55150342Sphk */ 56163481Skibstruct cdev_priv_list cdevp_list = TAILQ_HEAD_INITIALIZER(cdevp_list); 5765515Sphk 58150342Sphkstruct unrhdr *devfs_inos; 5969767Sphk 60150342Sphk 61150342Sphkstatic MALLOC_DEFINE(M_DEVFS2, "DEVFS2", "DEVFS data 2"); 62150342Sphkstatic MALLOC_DEFINE(M_DEVFS3, "DEVFS3", "DEVFS data 3"); 63150342Sphkstatic MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage"); 64150342Sphk 65141633Sphkstatic SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem"); 66150342Sphk 67150342Sphkstatic unsigned devfs_generation; 6865515SphkSYSCTL_UINT(_vfs_devfs, OID_AUTO, generation, CTLFLAG_RD, 6965515Sphk &devfs_generation, 0, "DEVFS generation number"); 7065515Sphk 71150147Sphkunsigned devfs_rule_depth = 1; 72150147SphkSYSCTL_UINT(_vfs_devfs, OID_AUTO, rule_depth, CTLFLAG_RW, 73150342Sphk &devfs_rule_depth, 0, "Max depth of ruleset include"); 74150147Sphk 75149146Sphk/* 76149146Sphk * Helper sysctl for devname(3). We're given a struct cdev * and return 77149146Sphk * the name, if any, registered by the device driver. 78149146Sphk */ 79149146Sphkstatic int 80149146Sphksysctl_devname(SYSCTL_HANDLER_ARGS) 81149146Sphk{ 82149146Sphk int error; 83149146Sphk dev_t ud; 84150342Sphk struct cdev_priv *cdp; 85149146Sphk 86149146Sphk error = SYSCTL_IN(req, &ud, sizeof (ud)); 87149146Sphk if (error) 88149146Sphk return (error); 89149146Sphk if (ud == NODEV) 90149146Sphk return(EINVAL); 91150342Sphk/* 92150342Sphk ud ^ devfs_random(); 93150342Sphk*/ 94150342Sphk dev_lock(); 95150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) 96150342Sphk if (cdp->cdp_inode == ud) 97150342Sphk break; 98150342Sphk dev_unlock(); 99150342Sphk if (cdp == NULL) 100149146Sphk return(ENOENT); 101150342Sphk return(SYSCTL_OUT(req, cdp->cdp_c.si_name, strlen(cdp->cdp_c.si_name) + 1)); 102149146Sphk return (error); 103149146Sphk} 104149146Sphk 105149146SphkSYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY, 106149146Sphk NULL, 0, sysctl_devname, "", "devname(3) handler"); 107149146Sphk 108149146SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 109149146Sphk 0, sizeof(struct cdev), "sizeof(struct cdev)"); 110149146Sphk 111150342SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, cdev_priv, CTLFLAG_RD, 112150342Sphk 0, sizeof(struct cdev_priv), "sizeof(struct cdev_priv)"); 11365515Sphk 114150342Sphkstruct cdev * 115150342Sphkdevfs_alloc(void) 11665515Sphk{ 117150342Sphk struct cdev_priv *cdp; 118150342Sphk struct cdev *cdev; 11965515Sphk 120150342Sphk cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO | M_WAITOK); 12165515Sphk 122150342Sphk cdp->cdp_dirents = &cdp->cdp_dirent0; 123150342Sphk cdp->cdp_dirent0 = NULL; 124150342Sphk cdp->cdp_maxdirent = 0; 12565515Sphk 126150342Sphk cdev = &cdp->cdp_c; 127150342Sphk cdev->si_priv = cdp; 12865515Sphk 129150342Sphk cdev->si_name = cdev->__si_namebuf; 130150342Sphk LIST_INIT(&cdev->si_children); 131150342Sphk return (cdev); 13265515Sphk} 13365515Sphk 134150342Sphkvoid 135150342Sphkdevfs_free(struct cdev *cdev) 13665515Sphk{ 137150342Sphk struct cdev_priv *cdp; 13865515Sphk 139150342Sphk cdp = cdev->si_priv; 140150342Sphk if (cdev->si_cred != NULL) 141150342Sphk crfree(cdev->si_cred); 142150342Sphk if (cdp->cdp_inode > 0) 143150342Sphk free_unr(devfs_inos, cdp->cdp_inode); 144150342Sphk if (cdp->cdp_maxdirent > 0) 145150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 146150342Sphk free(cdp, M_CDEVP); 14765515Sphk} 14865515Sphk 149150342Sphkstruct devfs_dirent * 15065132Sphkdevfs_find(struct devfs_dirent *dd, const char *name, int namelen) 15165132Sphk{ 15265132Sphk struct devfs_dirent *de; 15365132Sphk 15465132Sphk TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 15565132Sphk if (namelen != de->de_dirent->d_namlen) 15665132Sphk continue; 15765132Sphk if (bcmp(name, de->de_dirent->d_name, namelen) != 0) 15865132Sphk continue; 15965132Sphk break; 16065132Sphk } 16165132Sphk return (de); 16265132Sphk} 16365132Sphk 16465132Sphkstruct devfs_dirent * 16564880Sphkdevfs_newdirent(char *name, int namelen) 16664880Sphk{ 16764880Sphk int i; 16864880Sphk struct devfs_dirent *de; 16964880Sphk struct dirent d; 17064880Sphk 17164880Sphk d.d_namlen = namelen; 172150342Sphk i = sizeof (*de) + GENERIC_DIRSIZ(&d); 173150342Sphk de = malloc(i, M_DEVFS3, M_WAITOK | M_ZERO); 17464880Sphk de->de_dirent = (struct dirent *)(de + 1); 17564880Sphk de->de_dirent->d_namlen = namelen; 17664880Sphk de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d); 17771822Sphk bcopy(name, de->de_dirent->d_name, namelen); 17871822Sphk de->de_dirent->d_name[namelen] = '\0'; 17985979Sphk vfs_timestamp(&de->de_ctime); 18065051Sphk de->de_mtime = de->de_atime = de->de_ctime; 18165051Sphk de->de_links = 1; 182162398Skib de->de_holdcnt = 1; 183101069Srwatson#ifdef MAC 184101069Srwatson mac_init_devfsdirent(de); 185101069Srwatson#endif 18664880Sphk return (de); 18764880Sphk} 18864880Sphk 18965051Sphkstruct devfs_dirent * 190150342Sphkdevfs_vmkdir(struct devfs_mount *dmp, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode) 19164880Sphk{ 19265051Sphk struct devfs_dirent *dd; 19364880Sphk struct devfs_dirent *de; 19464880Sphk 195150342Sphk /* Create the new directory */ 19665051Sphk dd = devfs_newdirent(name, namelen); 19765051Sphk TAILQ_INIT(&dd->de_dlist); 19865051Sphk dd->de_dirent->d_type = DT_DIR; 19985979Sphk dd->de_mode = 0555; 20065051Sphk dd->de_links = 2; 20165051Sphk dd->de_dir = dd; 202150342Sphk if (inode != 0) 203150342Sphk dd->de_inode = inode; 204150342Sphk else 205150342Sphk dd->de_inode = alloc_unr(devfs_inos); 20665051Sphk 207150342Sphk /* Create the "." entry in the new directory */ 20864880Sphk de = devfs_newdirent(".", 1); 20964880Sphk de->de_dirent->d_type = DT_DIR; 21065051Sphk de->de_flags |= DE_DOT; 21165051Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 212150342Sphk de->de_dir = dd; 21365051Sphk 214150342Sphk /* Create the ".." entry in the new directory */ 21565051Sphk de = devfs_newdirent("..", 2); 21665051Sphk de->de_dirent->d_type = DT_DIR; 217150342Sphk de->de_flags |= DE_DOTDOT; 218150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 219150342Sphk if (dotdot == NULL) { 22065051Sphk de->de_dir = dd; 221150342Sphk } else { 22265051Sphk de->de_dir = dotdot; 223150342Sphk TAILQ_INSERT_TAIL(&dotdot->de_dlist, dd, de_list); 224150342Sphk dotdot->de_links++; 225150342Sphk } 22665051Sphk 227150342Sphk#ifdef MAC 228150342Sphk mac_create_devfs_directory(dmp->dm_mount, name, namelen, dd); 229150342Sphk#endif 23064880Sphk return (dd); 23164880Sphk} 23264880Sphk 233150342Sphkvoid 234162398Skibdevfs_dirent_free(struct devfs_dirent *de) 235162398Skib{ 236162398Skib free(de, M_DEVFS3); 237162398Skib} 238162398Skib 239163481Skib/* 240163481Skib * The caller needs to hold the dm for the duration of the call since 241163481Skib * dm->dm_lock may be temporary dropped. 242163481Skib */ 243162398Skibvoid 244163481Skibdevfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int vp_locked) 24564880Sphk{ 246163481Skib struct vnode *vp; 247163481Skib struct thread *td; 24864880Sphk 249162398Skib KASSERT((de->de_flags & DE_DOOMED) == 0, 250162398Skib ("devfs_delete doomed dirent")); 251163481Skib td = curthread; 252162398Skib de->de_flags |= DE_DOOMED; 253163481Skib mtx_lock(&devfs_de_interlock); 254163481Skib vp = de->de_vnode; 255163481Skib if (vp != NULL) { 256163481Skib VI_LOCK(vp); 257163481Skib mtx_unlock(&devfs_de_interlock); 258163481Skib vholdl(vp); 259163481Skib sx_unlock(&dm->dm_lock); 260163481Skib if (!vp_locked) 261163481Skib vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, td); 262163481Skib else 263163481Skib VI_UNLOCK(vp); 264163481Skib vgone(vp); 265163481Skib if (!vp_locked) 266163481Skib VOP_UNLOCK(vp, 0, td); 267163481Skib vdrop(vp); 268163481Skib sx_xlock(&dm->dm_lock); 269163481Skib } else 270163481Skib mtx_unlock(&devfs_de_interlock); 27164880Sphk if (de->de_symlink) { 272150151Sphk free(de->de_symlink, M_DEVFS); 27364880Sphk de->de_symlink = NULL; 27464880Sphk } 275101069Srwatson#ifdef MAC 276101069Srwatson mac_destroy_devfsdirent(de); 277101069Srwatson#endif 278150342Sphk if (de->de_inode > DEVFS_ROOTINO) { 279150342Sphk free_unr(devfs_inos, de->de_inode); 280150342Sphk de->de_inode = 0; 281150342Sphk } 282162398Skib if (DEVFS_DE_DROP(de)) 283162398Skib devfs_dirent_free(de); 28464880Sphk} 28564880Sphk 286150342Sphk/* 287150342Sphk * Called on unmount. 288163481Skib * Recursively removes the entire tree. 289163481Skib * The caller needs to hold the dm for the duration of the call. 290150342Sphk */ 291150342Sphk 292150342Sphkstatic void 293150342Sphkdevfs_purge(struct devfs_mount *dm, struct devfs_dirent *dd) 29464880Sphk{ 29564880Sphk struct devfs_dirent *de; 29664880Sphk 297150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 29864880Sphk for (;;) { 29965051Sphk de = TAILQ_FIRST(&dd->de_dlist); 30064880Sphk if (de == NULL) 30164880Sphk break; 302150342Sphk TAILQ_REMOVE(&dd->de_dlist, de, de_list); 303150342Sphk if (de->de_flags & (DE_DOT|DE_DOTDOT)) 304163481Skib devfs_delete(dm, de, 0); 305150342Sphk else if (de->de_dirent->d_type == DT_DIR) 306150342Sphk devfs_purge(dm, de); 307150342Sphk else 308163481Skib devfs_delete(dm, de, 0); 30964880Sphk } 310163481Skib devfs_delete(dm, dd, 0); 31164880Sphk} 31264880Sphk 313150342Sphk/* 314150342Sphk * Each cdev_priv has an array of pointers to devfs_dirent which is indexed 315150342Sphk * by the mount points dm_idx. 316150342Sphk * This function extends the array when necessary, taking into account that 317150342Sphk * the default array is 1 element and not malloc'ed. 318150342Sphk */ 319150342Sphkstatic void 320150342Sphkdevfs_metoo(struct cdev_priv *cdp, struct devfs_mount *dm) 321150342Sphk{ 322150342Sphk struct devfs_dirent **dep; 323150342Sphk int siz; 32464880Sphk 325150342Sphk siz = (dm->dm_idx + 1) * sizeof *dep; 326150342Sphk dep = malloc(siz, M_DEVFS2, M_WAITOK | M_ZERO); 327150342Sphk dev_lock(); 328150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent) { 329150342Sphk /* We got raced */ 330150342Sphk dev_unlock(); 331150342Sphk free(dep, M_DEVFS2); 332150342Sphk return; 333150342Sphk } 334150342Sphk memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep); 335150342Sphk if (cdp->cdp_maxdirent > 0) 336150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 337150342Sphk cdp->cdp_dirents = dep; 338150342Sphk /* 339150342Sphk * XXX: if malloc told us how much we actually got this could 340150342Sphk * XXX: be optimized. 341150342Sphk */ 342150342Sphk cdp->cdp_maxdirent = dm->dm_idx; 343150342Sphk dev_unlock(); 344150342Sphk} 345150342Sphk 346163481Skib/* 347163481Skib * The caller needs to hold the dm for the duration of the call. 348163481Skib */ 349150342Sphkstatic int 350150342Sphkdevfs_populate_loop(struct devfs_mount *dm, int cleanup) 35164880Sphk{ 352150342Sphk struct cdev_priv *cdp; 353150342Sphk struct devfs_dirent *de; 35465051Sphk struct devfs_dirent *dd; 355150342Sphk struct cdev *pdev; 356150342Sphk int j; 35764880Sphk char *q, *s; 35864880Sphk 359150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 360150342Sphk dev_lock(); 361150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 362150342Sphk 363150342Sphk KASSERT(cdp->cdp_dirents != NULL, ("NULL cdp_dirents")); 364150342Sphk 365150342Sphk /* 366150342Sphk * If we are unmounting, or the device has been destroyed, 367150342Sphk * clean up our dirent. 368150342Sphk */ 369150342Sphk if ((cleanup || !(cdp->cdp_flags & CDP_ACTIVE)) && 370150342Sphk dm->dm_idx <= cdp->cdp_maxdirent && 371150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 372150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 373150342Sphk cdp->cdp_dirents[dm->dm_idx] = NULL; 374150342Sphk KASSERT(cdp == de->de_cdp, 375150342Sphk ("%s %d %s %p %p", __func__, __LINE__, 376150342Sphk cdp->cdp_c.si_name, cdp, de->de_cdp)); 377150342Sphk KASSERT(de->de_dir != NULL, ("Null de->de_dir")); 378150342Sphk dev_unlock(); 379150342Sphk 380150342Sphk TAILQ_REMOVE(&de->de_dir->de_dlist, de, de_list); 381150342Sphk de->de_cdp = NULL; 382150342Sphk de->de_inode = 0; 383163481Skib devfs_delete(dm, de, 0); 384163481Skib dev_lock(); 385163481Skib cdp->cdp_inuse--; 386163481Skib dev_unlock(); 387150342Sphk return (1); 388150342Sphk } 389150342Sphk /* 390150342Sphk * GC any lingering devices 391150342Sphk */ 392150342Sphk if (!(cdp->cdp_flags & CDP_ACTIVE)) { 393150342Sphk if (cdp->cdp_inuse > 0) 39465051Sphk continue; 395150342Sphk TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 396150342Sphk dev_unlock(); 397150342Sphk dev_rel(&cdp->cdp_c); 398150342Sphk return (1); 399150342Sphk } 400150342Sphk /* 401150342Sphk * Don't create any new dirents if we are unmounting 402150342Sphk */ 403150342Sphk if (cleanup) 404150342Sphk continue; 405150342Sphk KASSERT((cdp->cdp_flags & CDP_ACTIVE), ("Bogons, I tell ya'!")); 406150342Sphk 407150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent && 408150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 409150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 410150342Sphk KASSERT(cdp == de->de_cdp, ("inconsistent cdp")); 411150342Sphk continue; 412150342Sphk } 413150342Sphk 414150342Sphk 415150342Sphk cdp->cdp_inuse++; 416150342Sphk dev_unlock(); 417150342Sphk 418150342Sphk if (dm->dm_idx > cdp->cdp_maxdirent) 419150342Sphk devfs_metoo(cdp, dm); 420150342Sphk 421150342Sphk dd = dm->dm_rootdir; 422150342Sphk s = cdp->cdp_c.si_name; 423150342Sphk for (;;) { 424150342Sphk for (q = s; *q != '/' && *q != '\0'; q++) 42564880Sphk continue; 426150342Sphk if (*q != '/') 427150342Sphk break; 428150342Sphk de = devfs_find(dd, s, q - s); 429150342Sphk if (de == NULL) 430150342Sphk de = devfs_vmkdir(dm, s, q - s, dd, 0); 431150342Sphk s = q + 1; 432150342Sphk dd = de; 433150342Sphk } 434150342Sphk 435150342Sphk de = devfs_newdirent(s, q - s); 436150342Sphk if (cdp->cdp_c.si_flags & SI_ALIAS) { 437150342Sphk de->de_uid = 0; 438150342Sphk de->de_gid = 0; 439150342Sphk de->de_mode = 0755; 440150342Sphk de->de_dirent->d_type = DT_LNK; 441150342Sphk pdev = cdp->cdp_c.si_parent; 442150342Sphk j = strlen(pdev->si_name) + 1; 443150342Sphk de->de_symlink = malloc(j, M_DEVFS, M_WAITOK); 444150342Sphk bcopy(pdev->si_name, de->de_symlink, j); 445150342Sphk } else { 446150342Sphk de->de_uid = cdp->cdp_c.si_uid; 447150342Sphk de->de_gid = cdp->cdp_c.si_gid; 448150342Sphk de->de_mode = cdp->cdp_c.si_mode; 449150342Sphk de->de_dirent->d_type = DT_CHR; 450150342Sphk } 451150342Sphk de->de_inode = cdp->cdp_inode; 452150342Sphk de->de_cdp = cdp; 453101069Srwatson#ifdef MAC 454150342Sphk mac_create_devfs_device(cdp->cdp_c.si_cred, dm->dm_mount, 455150342Sphk &cdp->cdp_c, de); 456101069Srwatson#endif 457150342Sphk de->de_dir = dd; 458150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 459150342Sphk devfs_rules_apply(dm, de); 460150342Sphk dev_lock(); 461150342Sphk /* XXX: could check that cdp is still active here */ 462150342Sphk KASSERT(cdp->cdp_dirents[dm->dm_idx] == NULL, 463150342Sphk ("%s %d\n", __func__, __LINE__)); 464150342Sphk cdp->cdp_dirents[dm->dm_idx] = de; 465150342Sphk KASSERT(de->de_cdp != (void *)0xdeadc0de, 466150342Sphk ("%s %d\n", __func__, __LINE__)); 467150342Sphk dev_unlock(); 468150342Sphk return (1); 46964880Sphk } 470150342Sphk dev_unlock(); 471150342Sphk return (0); 47264880Sphk} 47364880Sphk 474163481Skib/* 475163481Skib * The caller needs to hold the dm for the duration of the call. 476163481Skib */ 477150342Sphkvoid 478150342Sphkdevfs_populate(struct devfs_mount *dm) 479150342Sphk{ 480150342Sphk 481150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 482150342Sphk if (dm->dm_generation == devfs_generation) 483150342Sphk return; 484150342Sphk while (devfs_populate_loop(dm, 0)) 485150342Sphk continue; 486150342Sphk dm->dm_generation = devfs_generation; 487150342Sphk} 488150342Sphk 489163481Skib/* 490163481Skib * The caller needs to hold the dm for the duration of the call. 491163481Skib */ 492150342Sphkvoid 493150342Sphkdevfs_cleanup(struct devfs_mount *dm) 494150342Sphk{ 495150342Sphk 496150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 497150342Sphk while (devfs_populate_loop(dm, 1)) 498150342Sphk continue; 499150342Sphk devfs_purge(dm, dm->dm_rootdir); 500150342Sphk} 501150342Sphk 502130678Sphk/* 503130678Sphk * devfs_create() and devfs_destroy() are called from kern_conf.c and 504130678Sphk * in both cases the devlock() mutex is held, so no further locking 505130678Sphk * is necesary and no sleeping allowed. 506130678Sphk */ 507130678Sphk 508111730Sphkvoid 509130585Sphkdevfs_create(struct cdev *dev) 51064880Sphk{ 511150342Sphk struct cdev_priv *cdp; 51265515Sphk 513150342Sphk mtx_assert(&devmtx, MA_OWNED); 514150342Sphk cdp = dev->si_priv; 515150342Sphk cdp->cdp_flags |= CDP_ACTIVE; 516150342Sphk cdp->cdp_inode = alloc_unrl(devfs_inos); 517150342Sphk dev_refl(dev); 518150342Sphk TAILQ_INSERT_TAIL(&cdevp_list, cdp, cdp_list); 519130678Sphk devfs_generation++; 52064880Sphk} 52164880Sphk 522111730Sphkvoid 523130585Sphkdevfs_destroy(struct cdev *dev) 52464880Sphk{ 525150342Sphk struct cdev_priv *cdp; 52665515Sphk 527150342Sphk mtx_assert(&devmtx, MA_OWNED); 528150342Sphk cdp = dev->si_priv; 529150342Sphk cdp->cdp_flags &= ~CDP_ACTIVE; 530130678Sphk devfs_generation++; 53164880Sphk} 532150342Sphk 533150342Sphkstatic void 534150342Sphkdevfs_devs_init(void *junk __unused) 535150342Sphk{ 536150342Sphk 537150342Sphk devfs_inos = new_unrhdr(DEVFS_ROOTINO + 1, INT_MAX, &devmtx); 538150342Sphk} 539150342Sphk 540150342SphkSYSINIT(devfs_devs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_devs_init, NULL); 541