devfs_devs.c revision 226041
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 226041 2011-10-05 16:50:15Z kib $ 2964880Sphk */ 3064880Sphk 3164880Sphk#include <sys/param.h> 3264880Sphk#include <sys/systm.h> 3376166Smarkm#include <sys/conf.h> 3464880Sphk#include <sys/dirent.h> 3576166Smarkm#include <sys/kernel.h> 36150342Sphk#include <sys/limits.h> 3776166Smarkm#include <sys/lock.h> 3864880Sphk#include <sys/malloc.h> 3976166Smarkm#include <sys/proc.h> 40150342Sphk#include <sys/sx.h> 4165515Sphk#include <sys/sysctl.h> 4276166Smarkm#include <sys/vnode.h> 4364880Sphk 44150342Sphk#include <sys/kdb.h> 4565515Sphk 4664880Sphk#include <fs/devfs/devfs.h> 47149144Sphk#include <fs/devfs/devfs_int.h> 4864880Sphk 49163606Srwatson#include <security/mac/mac_framework.h> 50163606Srwatson 51150342Sphk/* 52150342Sphk * The one true (but secret) list of active devices in the system. 53150342Sphk * Locked by dev_lock()/devmtx 54150342Sphk */ 55163481Skibstruct cdev_priv_list cdevp_list = TAILQ_HEAD_INITIALIZER(cdevp_list); 5665515Sphk 57150342Sphkstruct unrhdr *devfs_inos; 5869767Sphk 59150342Sphk 60150342Sphkstatic MALLOC_DEFINE(M_DEVFS2, "DEVFS2", "DEVFS data 2"); 61150342Sphkstatic MALLOC_DEFINE(M_DEVFS3, "DEVFS3", "DEVFS data 3"); 62150342Sphkstatic MALLOC_DEFINE(M_CDEVP, "DEVFS1", "DEVFS cdev_priv storage"); 63150342Sphk 64141633Sphkstatic SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "DEVFS filesystem"); 65150342Sphk 66150342Sphkstatic unsigned devfs_generation; 6765515SphkSYSCTL_UINT(_vfs_devfs, OID_AUTO, generation, CTLFLAG_RD, 6865515Sphk &devfs_generation, 0, "DEVFS generation number"); 6965515Sphk 70150147Sphkunsigned devfs_rule_depth = 1; 71150147SphkSYSCTL_UINT(_vfs_devfs, OID_AUTO, rule_depth, CTLFLAG_RW, 72150342Sphk &devfs_rule_depth, 0, "Max depth of ruleset include"); 73150147Sphk 74149146Sphk/* 75203292Sed * Helper sysctl for devname(3). We're given a dev_t and return the 76203292Sed * name, if any, registered by the device driver. 77149146Sphk */ 78149146Sphkstatic int 79149146Sphksysctl_devname(SYSCTL_HANDLER_ARGS) 80149146Sphk{ 81149146Sphk int error; 82149146Sphk dev_t ud; 83150342Sphk struct cdev_priv *cdp; 84203292Sed struct cdev *dev; 85149146Sphk 86149146Sphk error = SYSCTL_IN(req, &ud, sizeof (ud)); 87149146Sphk if (error) 88149146Sphk return (error); 89149146Sphk if (ud == NODEV) 90203292Sed return (EINVAL); 91203292Sed dev = NULL; 92150342Sphk dev_lock(); 93150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) 94203292Sed if (cdp->cdp_inode == ud) { 95203292Sed dev = &cdp->cdp_c; 96203292Sed dev_refl(dev); 97150342Sphk break; 98203292Sed } 99150342Sphk dev_unlock(); 100203292Sed if (dev == NULL) 101203292Sed return (ENOENT); 102203292Sed error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1); 103203292Sed dev_rel(dev); 104149146Sphk return (error); 105149146Sphk} 106149146Sphk 107187864SedSYSCTL_PROC(_kern, OID_AUTO, devname, 108187864Sed CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY|CTLFLAG_MPSAFE, 109187864Sed NULL, 0, sysctl_devname, "", "devname(3) handler"); 110149146Sphk 111149146SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, cdev, CTLFLAG_RD, 112149146Sphk 0, sizeof(struct cdev), "sizeof(struct cdev)"); 113149146Sphk 114150342SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, cdev_priv, CTLFLAG_RD, 115150342Sphk 0, sizeof(struct cdev_priv), "sizeof(struct cdev_priv)"); 11665515Sphk 117150342Sphkstruct cdev * 118207729Skibdevfs_alloc(int flags) 11965515Sphk{ 120150342Sphk struct cdev_priv *cdp; 121150342Sphk struct cdev *cdev; 122183230Sed struct timespec ts; 12365515Sphk 124207729Skib cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO | 125207729Skib ((flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK)); 126207729Skib if (cdp == NULL) 127207729Skib return (NULL); 12865515Sphk 129150342Sphk cdp->cdp_dirents = &cdp->cdp_dirent0; 130150342Sphk cdp->cdp_dirent0 = NULL; 131150342Sphk cdp->cdp_maxdirent = 0; 132207729Skib cdp->cdp_inode = 0; 13365515Sphk 134150342Sphk cdev = &cdp->cdp_c; 13565515Sphk 136150342Sphk cdev->si_name = cdev->__si_namebuf; 137150342Sphk LIST_INIT(&cdev->si_children); 138183230Sed vfs_timestamp(&ts); 139183230Sed cdev->si_atime = cdev->si_mtime = cdev->si_ctime = ts; 140207729Skib cdev->si_cred = NULL; 141183230Sed 142150342Sphk return (cdev); 14365515Sphk} 14465515Sphk 145213221Sjhint 146213221Sjhdevfs_dev_exists(const char *name) 147213221Sjh{ 148213221Sjh struct cdev_priv *cdp; 149213221Sjh 150213221Sjh mtx_assert(&devmtx, MA_OWNED); 151213221Sjh 152213221Sjh TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 153213221Sjh if ((cdp->cdp_flags & CDP_ACTIVE) == 0) 154213221Sjh continue; 155213221Sjh if (devfs_pathpath(cdp->cdp_c.si_name, name) != 0) 156213221Sjh return (1); 157213221Sjh if (devfs_pathpath(name, cdp->cdp_c.si_name) != 0) 158213221Sjh return (1); 159213221Sjh } 160213221Sjh if (devfs_dir_find(name) != 0) 161213221Sjh return (1); 162213221Sjh 163213221Sjh return (0); 164213221Sjh} 165213221Sjh 166150342Sphkvoid 167150342Sphkdevfs_free(struct cdev *cdev) 16865515Sphk{ 169150342Sphk struct cdev_priv *cdp; 17065515Sphk 171179828Skib cdp = cdev2priv(cdev); 172150342Sphk if (cdev->si_cred != NULL) 173150342Sphk crfree(cdev->si_cred); 174226041Skib devfs_free_cdp_inode(cdp->cdp_inode); 175150342Sphk if (cdp->cdp_maxdirent > 0) 176150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 177150342Sphk free(cdp, M_CDEVP); 17865515Sphk} 17965515Sphk 180150342Sphkstruct devfs_dirent * 181211226Sjhdevfs_find(struct devfs_dirent *dd, const char *name, int namelen, int type) 18265132Sphk{ 18365132Sphk struct devfs_dirent *de; 18465132Sphk 18565132Sphk TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 18665132Sphk if (namelen != de->de_dirent->d_namlen) 18765132Sphk continue; 188211226Sjh if (type != 0 && type != de->de_dirent->d_type) 189211226Sjh continue; 19065132Sphk if (bcmp(name, de->de_dirent->d_name, namelen) != 0) 19165132Sphk continue; 19265132Sphk break; 19365132Sphk } 194212826Sjh KASSERT(de == NULL || (de->de_flags & DE_DOOMED) == 0, 195212826Sjh ("devfs_find: returning a doomed entry")); 19665132Sphk return (de); 19765132Sphk} 19865132Sphk 19965132Sphkstruct devfs_dirent * 20064880Sphkdevfs_newdirent(char *name, int namelen) 20164880Sphk{ 20264880Sphk int i; 20364880Sphk struct devfs_dirent *de; 20464880Sphk struct dirent d; 20564880Sphk 20664880Sphk d.d_namlen = namelen; 207150342Sphk i = sizeof (*de) + GENERIC_DIRSIZ(&d); 208150342Sphk de = malloc(i, M_DEVFS3, M_WAITOK | M_ZERO); 20964880Sphk de->de_dirent = (struct dirent *)(de + 1); 21064880Sphk de->de_dirent->d_namlen = namelen; 21164880Sphk de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d); 21271822Sphk bcopy(name, de->de_dirent->d_name, namelen); 21371822Sphk de->de_dirent->d_name[namelen] = '\0'; 21485979Sphk vfs_timestamp(&de->de_ctime); 21565051Sphk de->de_mtime = de->de_atime = de->de_ctime; 21665051Sphk de->de_links = 1; 217162398Skib de->de_holdcnt = 1; 218101069Srwatson#ifdef MAC 219172930Srwatson mac_devfs_init(de); 220101069Srwatson#endif 22164880Sphk return (de); 22264880Sphk} 22364880Sphk 22465051Sphkstruct devfs_dirent * 225208951Sjhdevfs_parent_dirent(struct devfs_dirent *de) 226208951Sjh{ 227208951Sjh 228208951Sjh if (de->de_dirent->d_type != DT_DIR) 229208951Sjh return (de->de_dir); 230208951Sjh 231208951Sjh if (de->de_flags & (DE_DOT | DE_DOTDOT)) 232208951Sjh return (NULL); 233208951Sjh 234208951Sjh de = TAILQ_FIRST(&de->de_dlist); /* "." */ 235208951Sjh if (de == NULL) 236208951Sjh return (NULL); 237208951Sjh de = TAILQ_NEXT(de, de_list); /* ".." */ 238208951Sjh if (de == NULL) 239208951Sjh return (NULL); 240208951Sjh 241208951Sjh return (de->de_dir); 242208951Sjh} 243208951Sjh 244208951Sjhstruct devfs_dirent * 245150342Sphkdevfs_vmkdir(struct devfs_mount *dmp, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode) 24664880Sphk{ 24765051Sphk struct devfs_dirent *dd; 24864880Sphk struct devfs_dirent *de; 24964880Sphk 250150342Sphk /* Create the new directory */ 25165051Sphk dd = devfs_newdirent(name, namelen); 25265051Sphk TAILQ_INIT(&dd->de_dlist); 25365051Sphk dd->de_dirent->d_type = DT_DIR; 25485979Sphk dd->de_mode = 0555; 25565051Sphk dd->de_links = 2; 25665051Sphk dd->de_dir = dd; 257150342Sphk if (inode != 0) 258150342Sphk dd->de_inode = inode; 259150342Sphk else 260150342Sphk dd->de_inode = alloc_unr(devfs_inos); 26165051Sphk 262211226Sjh /* 263211226Sjh * "." and ".." are always the two first entries in the 264211226Sjh * de_dlist list. 265211226Sjh * 266211226Sjh * Create the "." entry in the new directory. 267211226Sjh */ 26864880Sphk de = devfs_newdirent(".", 1); 26964880Sphk de->de_dirent->d_type = DT_DIR; 27065051Sphk de->de_flags |= DE_DOT; 27165051Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 272150342Sphk de->de_dir = dd; 27365051Sphk 274211226Sjh /* Create the ".." entry in the new directory. */ 27565051Sphk de = devfs_newdirent("..", 2); 27665051Sphk de->de_dirent->d_type = DT_DIR; 277150342Sphk de->de_flags |= DE_DOTDOT; 278150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 279150342Sphk if (dotdot == NULL) { 28065051Sphk de->de_dir = dd; 281150342Sphk } else { 28265051Sphk de->de_dir = dotdot; 283216461Sjh sx_assert(&dmp->dm_lock, SX_XLOCKED); 284150342Sphk TAILQ_INSERT_TAIL(&dotdot->de_dlist, dd, de_list); 285150342Sphk dotdot->de_links++; 286216461Sjh devfs_rules_apply(dmp, dd); 287150342Sphk } 28865051Sphk 289150342Sphk#ifdef MAC 290172930Srwatson mac_devfs_create_directory(dmp->dm_mount, name, namelen, dd); 291150342Sphk#endif 29264880Sphk return (dd); 29364880Sphk} 29464880Sphk 295150342Sphkvoid 296162398Skibdevfs_dirent_free(struct devfs_dirent *de) 297162398Skib{ 298162398Skib free(de, M_DEVFS3); 299162398Skib} 300162398Skib 301163481Skib/* 302212660Sjh * Removes a directory if it is empty. Also empty parent directories are 303212660Sjh * removed recursively. 304212660Sjh */ 305212660Sjhstatic void 306212660Sjhdevfs_rmdir_empty(struct devfs_mount *dm, struct devfs_dirent *de) 307212660Sjh{ 308212660Sjh struct devfs_dirent *dd, *de_dot, *de_dotdot; 309212660Sjh 310212660Sjh sx_assert(&dm->dm_lock, SX_XLOCKED); 311212660Sjh 312212660Sjh for (;;) { 313212660Sjh KASSERT(de->de_dirent->d_type == DT_DIR, 314212660Sjh ("devfs_rmdir_empty: de is not a directory")); 315212660Sjh 316212660Sjh if ((de->de_flags & DE_DOOMED) != 0 || de == dm->dm_rootdir) 317212660Sjh return; 318212660Sjh 319212660Sjh de_dot = TAILQ_FIRST(&de->de_dlist); 320212660Sjh KASSERT(de_dot != NULL, ("devfs_rmdir_empty: . missing")); 321212660Sjh de_dotdot = TAILQ_NEXT(de_dot, de_list); 322212660Sjh KASSERT(de_dotdot != NULL, ("devfs_rmdir_empty: .. missing")); 323212660Sjh /* Return if the directory is not empty. */ 324212660Sjh if (TAILQ_NEXT(de_dotdot, de_list) != NULL) 325212660Sjh return; 326212660Sjh 327212660Sjh dd = devfs_parent_dirent(de); 328212660Sjh KASSERT(dd != NULL, ("devfs_rmdir_empty: NULL dd")); 329212826Sjh TAILQ_REMOVE(&de->de_dlist, de_dot, de_list); 330212826Sjh TAILQ_REMOVE(&de->de_dlist, de_dotdot, de_list); 331212660Sjh TAILQ_REMOVE(&dd->de_dlist, de, de_list); 332212660Sjh DEVFS_DE_HOLD(dd); 333212660Sjh devfs_delete(dm, de, DEVFS_DEL_NORECURSE); 334212660Sjh devfs_delete(dm, de_dot, DEVFS_DEL_NORECURSE); 335212660Sjh devfs_delete(dm, de_dotdot, DEVFS_DEL_NORECURSE); 336212660Sjh if (DEVFS_DE_DROP(dd)) { 337212660Sjh devfs_dirent_free(dd); 338212660Sjh return; 339212660Sjh } 340212660Sjh 341212660Sjh de = dd; 342212660Sjh } 343212660Sjh} 344212660Sjh 345212660Sjh/* 346163481Skib * The caller needs to hold the dm for the duration of the call since 347163481Skib * dm->dm_lock may be temporary dropped. 348163481Skib */ 349162398Skibvoid 350212660Sjhdevfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int flags) 35164880Sphk{ 352212660Sjh struct devfs_dirent *dd; 353163481Skib struct vnode *vp; 35464880Sphk 355162398Skib KASSERT((de->de_flags & DE_DOOMED) == 0, 356162398Skib ("devfs_delete doomed dirent")); 357162398Skib de->de_flags |= DE_DOOMED; 358212660Sjh 359212660Sjh if ((flags & DEVFS_DEL_NORECURSE) == 0) { 360212660Sjh dd = devfs_parent_dirent(de); 361212660Sjh if (dd != NULL) 362212660Sjh DEVFS_DE_HOLD(dd); 363213215Sjh if (de->de_flags & DE_USER) { 364213215Sjh KASSERT(dd != NULL, ("devfs_delete: NULL dd")); 365213215Sjh devfs_dir_unref_de(dm, dd); 366213215Sjh } 367212660Sjh } else 368212660Sjh dd = NULL; 369212660Sjh 370163481Skib mtx_lock(&devfs_de_interlock); 371163481Skib vp = de->de_vnode; 372163481Skib if (vp != NULL) { 373163481Skib VI_LOCK(vp); 374163481Skib mtx_unlock(&devfs_de_interlock); 375163481Skib vholdl(vp); 376163481Skib sx_unlock(&dm->dm_lock); 377212660Sjh if ((flags & DEVFS_DEL_VNLOCKED) == 0) 378175202Sattilio vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 379163481Skib else 380163481Skib VI_UNLOCK(vp); 381163481Skib vgone(vp); 382212660Sjh if ((flags & DEVFS_DEL_VNLOCKED) == 0) 383175294Sattilio VOP_UNLOCK(vp, 0); 384163481Skib vdrop(vp); 385163481Skib sx_xlock(&dm->dm_lock); 386163481Skib } else 387163481Skib mtx_unlock(&devfs_de_interlock); 38864880Sphk if (de->de_symlink) { 389150151Sphk free(de->de_symlink, M_DEVFS); 39064880Sphk de->de_symlink = NULL; 39164880Sphk } 392101069Srwatson#ifdef MAC 393172930Srwatson mac_devfs_destroy(de); 394101069Srwatson#endif 395150342Sphk if (de->de_inode > DEVFS_ROOTINO) { 396226041Skib devfs_free_cdp_inode(de->de_inode); 397150342Sphk de->de_inode = 0; 398150342Sphk } 399162398Skib if (DEVFS_DE_DROP(de)) 400162398Skib devfs_dirent_free(de); 401212660Sjh 402212660Sjh if (dd != NULL) { 403212660Sjh if (DEVFS_DE_DROP(dd)) 404212660Sjh devfs_dirent_free(dd); 405212660Sjh else 406212660Sjh devfs_rmdir_empty(dm, dd); 407212660Sjh } 40864880Sphk} 40964880Sphk 410150342Sphk/* 411150342Sphk * Called on unmount. 412163481Skib * Recursively removes the entire tree. 413163481Skib * The caller needs to hold the dm for the duration of the call. 414150342Sphk */ 415150342Sphk 416150342Sphkstatic void 417150342Sphkdevfs_purge(struct devfs_mount *dm, struct devfs_dirent *dd) 41864880Sphk{ 41964880Sphk struct devfs_dirent *de; 42064880Sphk 421150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 422212660Sjh 423212660Sjh DEVFS_DE_HOLD(dd); 42464880Sphk for (;;) { 425213215Sjh /* 426213215Sjh * Use TAILQ_LAST() to remove "." and ".." last. 427213215Sjh * We might need ".." to resolve a path in 428213215Sjh * devfs_dir_unref_de(). 429213215Sjh */ 430213215Sjh de = TAILQ_LAST(&dd->de_dlist, devfs_dlist_head); 43164880Sphk if (de == NULL) 43264880Sphk break; 433150342Sphk TAILQ_REMOVE(&dd->de_dlist, de, de_list); 434213215Sjh if (de->de_flags & DE_USER) 435213215Sjh devfs_dir_unref_de(dm, dd); 436212660Sjh if (de->de_flags & (DE_DOT | DE_DOTDOT)) 437212660Sjh devfs_delete(dm, de, DEVFS_DEL_NORECURSE); 438150342Sphk else if (de->de_dirent->d_type == DT_DIR) 439150342Sphk devfs_purge(dm, de); 440212660Sjh else 441212660Sjh devfs_delete(dm, de, DEVFS_DEL_NORECURSE); 44264880Sphk } 443212660Sjh if (DEVFS_DE_DROP(dd)) 444212660Sjh devfs_dirent_free(dd); 445212660Sjh else if ((dd->de_flags & DE_DOOMED) == 0) 446212660Sjh devfs_delete(dm, dd, DEVFS_DEL_NORECURSE); 44764880Sphk} 44864880Sphk 449150342Sphk/* 450150342Sphk * Each cdev_priv has an array of pointers to devfs_dirent which is indexed 451150342Sphk * by the mount points dm_idx. 452150342Sphk * This function extends the array when necessary, taking into account that 453150342Sphk * the default array is 1 element and not malloc'ed. 454150342Sphk */ 455150342Sphkstatic void 456150342Sphkdevfs_metoo(struct cdev_priv *cdp, struct devfs_mount *dm) 457150342Sphk{ 458150342Sphk struct devfs_dirent **dep; 459150342Sphk int siz; 46064880Sphk 461150342Sphk siz = (dm->dm_idx + 1) * sizeof *dep; 462150342Sphk dep = malloc(siz, M_DEVFS2, M_WAITOK | M_ZERO); 463150342Sphk dev_lock(); 464150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent) { 465150342Sphk /* We got raced */ 466150342Sphk dev_unlock(); 467150342Sphk free(dep, M_DEVFS2); 468150342Sphk return; 469150342Sphk } 470150342Sphk memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep); 471150342Sphk if (cdp->cdp_maxdirent > 0) 472150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 473150342Sphk cdp->cdp_dirents = dep; 474150342Sphk /* 475150342Sphk * XXX: if malloc told us how much we actually got this could 476150342Sphk * XXX: be optimized. 477150342Sphk */ 478150342Sphk cdp->cdp_maxdirent = dm->dm_idx; 479150342Sphk dev_unlock(); 480150342Sphk} 481150342Sphk 482163481Skib/* 483163481Skib * The caller needs to hold the dm for the duration of the call. 484163481Skib */ 485150342Sphkstatic int 486150342Sphkdevfs_populate_loop(struct devfs_mount *dm, int cleanup) 48764880Sphk{ 488150342Sphk struct cdev_priv *cdp; 489150342Sphk struct devfs_dirent *de; 49065051Sphk struct devfs_dirent *dd; 491150342Sphk struct cdev *pdev; 492211226Sjh int de_flags, j; 49364880Sphk char *q, *s; 49464880Sphk 495150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 496150342Sphk dev_lock(); 497150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 498150342Sphk 499150342Sphk KASSERT(cdp->cdp_dirents != NULL, ("NULL cdp_dirents")); 500150342Sphk 501150342Sphk /* 502150342Sphk * If we are unmounting, or the device has been destroyed, 503150342Sphk * clean up our dirent. 504150342Sphk */ 505150342Sphk if ((cleanup || !(cdp->cdp_flags & CDP_ACTIVE)) && 506150342Sphk dm->dm_idx <= cdp->cdp_maxdirent && 507150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 508150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 509150342Sphk cdp->cdp_dirents[dm->dm_idx] = NULL; 510150342Sphk KASSERT(cdp == de->de_cdp, 511150342Sphk ("%s %d %s %p %p", __func__, __LINE__, 512150342Sphk cdp->cdp_c.si_name, cdp, de->de_cdp)); 513150342Sphk KASSERT(de->de_dir != NULL, ("Null de->de_dir")); 514150342Sphk dev_unlock(); 515150342Sphk 516150342Sphk TAILQ_REMOVE(&de->de_dir->de_dlist, de, de_list); 517150342Sphk de->de_cdp = NULL; 518150342Sphk de->de_inode = 0; 519163481Skib devfs_delete(dm, de, 0); 520163481Skib dev_lock(); 521163481Skib cdp->cdp_inuse--; 522163481Skib dev_unlock(); 523150342Sphk return (1); 524150342Sphk } 525150342Sphk /* 526150342Sphk * GC any lingering devices 527150342Sphk */ 528150342Sphk if (!(cdp->cdp_flags & CDP_ACTIVE)) { 529150342Sphk if (cdp->cdp_inuse > 0) 53065051Sphk continue; 531150342Sphk TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 532150342Sphk dev_unlock(); 533150342Sphk dev_rel(&cdp->cdp_c); 534150342Sphk return (1); 535150342Sphk } 536150342Sphk /* 537150342Sphk * Don't create any new dirents if we are unmounting 538150342Sphk */ 539150342Sphk if (cleanup) 540150342Sphk continue; 541150342Sphk KASSERT((cdp->cdp_flags & CDP_ACTIVE), ("Bogons, I tell ya'!")); 542150342Sphk 543150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent && 544150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 545150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 546150342Sphk KASSERT(cdp == de->de_cdp, ("inconsistent cdp")); 547150342Sphk continue; 548150342Sphk } 549150342Sphk 550150342Sphk 551150342Sphk cdp->cdp_inuse++; 552150342Sphk dev_unlock(); 553150342Sphk 554150342Sphk if (dm->dm_idx > cdp->cdp_maxdirent) 555150342Sphk devfs_metoo(cdp, dm); 556150342Sphk 557150342Sphk dd = dm->dm_rootdir; 558150342Sphk s = cdp->cdp_c.si_name; 559150342Sphk for (;;) { 560150342Sphk for (q = s; *q != '/' && *q != '\0'; q++) 56164880Sphk continue; 562150342Sphk if (*q != '/') 563150342Sphk break; 564211226Sjh de = devfs_find(dd, s, q - s, 0); 565150342Sphk if (de == NULL) 566150342Sphk de = devfs_vmkdir(dm, s, q - s, dd, 0); 567211226Sjh else if (de->de_dirent->d_type == DT_LNK) { 568211226Sjh de = devfs_find(dd, s, q - s, DT_DIR); 569211226Sjh if (de == NULL) 570211226Sjh de = devfs_vmkdir(dm, s, q - s, dd, 0); 571211226Sjh de->de_flags |= DE_COVERED; 572211226Sjh } 573150342Sphk s = q + 1; 574150342Sphk dd = de; 575211226Sjh KASSERT(dd->de_dirent->d_type == DT_DIR && 576211226Sjh (dd->de_flags & (DE_DOT | DE_DOTDOT)) == 0, 577211226Sjh ("%s: invalid directory (si_name=%s)", 578211226Sjh __func__, cdp->cdp_c.si_name)); 579211226Sjh 580150342Sphk } 581211226Sjh de_flags = 0; 582211226Sjh de = devfs_find(dd, s, q - s, DT_LNK); 583211226Sjh if (de != NULL) 584211226Sjh de_flags |= DE_COVERED; 585150342Sphk 586150342Sphk de = devfs_newdirent(s, q - s); 587150342Sphk if (cdp->cdp_c.si_flags & SI_ALIAS) { 588150342Sphk de->de_uid = 0; 589150342Sphk de->de_gid = 0; 590150342Sphk de->de_mode = 0755; 591150342Sphk de->de_dirent->d_type = DT_LNK; 592150342Sphk pdev = cdp->cdp_c.si_parent; 593150342Sphk j = strlen(pdev->si_name) + 1; 594150342Sphk de->de_symlink = malloc(j, M_DEVFS, M_WAITOK); 595150342Sphk bcopy(pdev->si_name, de->de_symlink, j); 596150342Sphk } else { 597150342Sphk de->de_uid = cdp->cdp_c.si_uid; 598150342Sphk de->de_gid = cdp->cdp_c.si_gid; 599150342Sphk de->de_mode = cdp->cdp_c.si_mode; 600150342Sphk de->de_dirent->d_type = DT_CHR; 601150342Sphk } 602211226Sjh de->de_flags |= de_flags; 603150342Sphk de->de_inode = cdp->cdp_inode; 604150342Sphk de->de_cdp = cdp; 605101069Srwatson#ifdef MAC 606172930Srwatson mac_devfs_create_device(cdp->cdp_c.si_cred, dm->dm_mount, 607150342Sphk &cdp->cdp_c, de); 608101069Srwatson#endif 609150342Sphk de->de_dir = dd; 610150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 611150342Sphk devfs_rules_apply(dm, de); 612150342Sphk dev_lock(); 613150342Sphk /* XXX: could check that cdp is still active here */ 614150342Sphk KASSERT(cdp->cdp_dirents[dm->dm_idx] == NULL, 615150342Sphk ("%s %d\n", __func__, __LINE__)); 616150342Sphk cdp->cdp_dirents[dm->dm_idx] = de; 617150342Sphk KASSERT(de->de_cdp != (void *)0xdeadc0de, 618150342Sphk ("%s %d\n", __func__, __LINE__)); 619150342Sphk dev_unlock(); 620150342Sphk return (1); 62164880Sphk } 622150342Sphk dev_unlock(); 623150342Sphk return (0); 62464880Sphk} 62564880Sphk 626163481Skib/* 627163481Skib * The caller needs to hold the dm for the duration of the call. 628163481Skib */ 629150342Sphkvoid 630150342Sphkdevfs_populate(struct devfs_mount *dm) 631150342Sphk{ 632224743Skib unsigned gen; 633150342Sphk 634150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 635224743Skib gen = devfs_generation; 636224743Skib if (dm->dm_generation == gen) 637150342Sphk return; 638150342Sphk while (devfs_populate_loop(dm, 0)) 639150342Sphk continue; 640224743Skib dm->dm_generation = gen; 641150342Sphk} 642150342Sphk 643163481Skib/* 644163481Skib * The caller needs to hold the dm for the duration of the call. 645163481Skib */ 646150342Sphkvoid 647150342Sphkdevfs_cleanup(struct devfs_mount *dm) 648150342Sphk{ 649150342Sphk 650150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 651150342Sphk while (devfs_populate_loop(dm, 1)) 652150342Sphk continue; 653150342Sphk devfs_purge(dm, dm->dm_rootdir); 654150342Sphk} 655150342Sphk 656130678Sphk/* 657130678Sphk * devfs_create() and devfs_destroy() are called from kern_conf.c and 658130678Sphk * in both cases the devlock() mutex is held, so no further locking 659130678Sphk * is necesary and no sleeping allowed. 660130678Sphk */ 661130678Sphk 662111730Sphkvoid 663130585Sphkdevfs_create(struct cdev *dev) 66464880Sphk{ 665150342Sphk struct cdev_priv *cdp; 66665515Sphk 667150342Sphk mtx_assert(&devmtx, MA_OWNED); 668179828Skib cdp = cdev2priv(dev); 669150342Sphk cdp->cdp_flags |= CDP_ACTIVE; 670150342Sphk cdp->cdp_inode = alloc_unrl(devfs_inos); 671150342Sphk dev_refl(dev); 672150342Sphk TAILQ_INSERT_TAIL(&cdevp_list, cdp, cdp_list); 673130678Sphk devfs_generation++; 67464880Sphk} 67564880Sphk 676111730Sphkvoid 677130585Sphkdevfs_destroy(struct cdev *dev) 67864880Sphk{ 679150342Sphk struct cdev_priv *cdp; 68065515Sphk 681150342Sphk mtx_assert(&devmtx, MA_OWNED); 682179828Skib cdp = cdev2priv(dev); 683150342Sphk cdp->cdp_flags &= ~CDP_ACTIVE; 684130678Sphk devfs_generation++; 68564880Sphk} 686150342Sphk 687226041Skibino_t 688226041Skibdevfs_alloc_cdp_inode(void) 689226041Skib{ 690226041Skib 691226041Skib return (alloc_unr(devfs_inos)); 692226041Skib} 693226041Skib 694226041Skibvoid 695226041Skibdevfs_free_cdp_inode(ino_t ino) 696226041Skib{ 697226041Skib 698226041Skib if (ino > 0) 699226041Skib free_unr(devfs_inos, ino); 700226041Skib} 701226041Skib 702150342Sphkstatic void 703150342Sphkdevfs_devs_init(void *junk __unused) 704150342Sphk{ 705150342Sphk 706150342Sphk devfs_inos = new_unrhdr(DEVFS_ROOTINO + 1, INT_MAX, &devmtx); 707150342Sphk} 708150342Sphk 709150342SphkSYSINIT(devfs_devs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_devs_init, NULL); 710