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 * $FreeBSD$ 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 124243039Skib cdp = malloc(sizeof *cdp, M_CDEVP, 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 LIST_INIT(&cdev->si_children); 137183230Sed vfs_timestamp(&ts); 138183230Sed cdev->si_atime = cdev->si_mtime = cdev->si_ctime = ts; 139207729Skib cdev->si_cred = NULL; 140183230Sed 141150342Sphk return (cdev); 14265515Sphk} 14365515Sphk 144213221Sjhint 145213221Sjhdevfs_dev_exists(const char *name) 146213221Sjh{ 147213221Sjh struct cdev_priv *cdp; 148213221Sjh 149213221Sjh mtx_assert(&devmtx, MA_OWNED); 150213221Sjh 151213221Sjh TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 152213221Sjh if ((cdp->cdp_flags & CDP_ACTIVE) == 0) 153213221Sjh continue; 154213221Sjh if (devfs_pathpath(cdp->cdp_c.si_name, name) != 0) 155213221Sjh return (1); 156213221Sjh if (devfs_pathpath(name, cdp->cdp_c.si_name) != 0) 157213221Sjh return (1); 158213221Sjh } 159213221Sjh if (devfs_dir_find(name) != 0) 160213221Sjh return (1); 161213221Sjh 162213221Sjh return (0); 163213221Sjh} 164213221Sjh 165150342Sphkvoid 166150342Sphkdevfs_free(struct cdev *cdev) 16765515Sphk{ 168150342Sphk struct cdev_priv *cdp; 16965515Sphk 170179828Skib cdp = cdev2priv(cdev); 171150342Sphk if (cdev->si_cred != NULL) 172150342Sphk crfree(cdev->si_cred); 173226041Skib devfs_free_cdp_inode(cdp->cdp_inode); 174150342Sphk if (cdp->cdp_maxdirent > 0) 175150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 176150342Sphk free(cdp, M_CDEVP); 17765515Sphk} 17865515Sphk 179150342Sphkstruct devfs_dirent * 180211226Sjhdevfs_find(struct devfs_dirent *dd, const char *name, int namelen, int type) 18165132Sphk{ 18265132Sphk struct devfs_dirent *de; 18365132Sphk 18465132Sphk TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 18565132Sphk if (namelen != de->de_dirent->d_namlen) 18665132Sphk continue; 187211226Sjh if (type != 0 && type != de->de_dirent->d_type) 188211226Sjh continue; 18965132Sphk if (bcmp(name, de->de_dirent->d_name, namelen) != 0) 19065132Sphk continue; 19165132Sphk break; 19265132Sphk } 193212826Sjh KASSERT(de == NULL || (de->de_flags & DE_DOOMED) == 0, 194212826Sjh ("devfs_find: returning a doomed entry")); 19565132Sphk return (de); 19665132Sphk} 19765132Sphk 19865132Sphkstruct devfs_dirent * 19964880Sphkdevfs_newdirent(char *name, int namelen) 20064880Sphk{ 20164880Sphk int i; 20264880Sphk struct devfs_dirent *de; 20364880Sphk struct dirent d; 20464880Sphk 20564880Sphk d.d_namlen = namelen; 206150342Sphk i = sizeof (*de) + GENERIC_DIRSIZ(&d); 207150342Sphk de = malloc(i, M_DEVFS3, M_WAITOK | M_ZERO); 20864880Sphk de->de_dirent = (struct dirent *)(de + 1); 20964880Sphk de->de_dirent->d_namlen = namelen; 21064880Sphk de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d); 21171822Sphk bcopy(name, de->de_dirent->d_name, namelen); 21271822Sphk de->de_dirent->d_name[namelen] = '\0'; 21385979Sphk vfs_timestamp(&de->de_ctime); 21465051Sphk de->de_mtime = de->de_atime = de->de_ctime; 21565051Sphk de->de_links = 1; 216162398Skib de->de_holdcnt = 1; 217101069Srwatson#ifdef MAC 218172930Srwatson mac_devfs_init(de); 219101069Srwatson#endif 22064880Sphk return (de); 22164880Sphk} 22264880Sphk 22365051Sphkstruct devfs_dirent * 224208951Sjhdevfs_parent_dirent(struct devfs_dirent *de) 225208951Sjh{ 226208951Sjh 227208951Sjh if (de->de_dirent->d_type != DT_DIR) 228208951Sjh return (de->de_dir); 229208951Sjh 230208951Sjh if (de->de_flags & (DE_DOT | DE_DOTDOT)) 231208951Sjh return (NULL); 232208951Sjh 233208951Sjh de = TAILQ_FIRST(&de->de_dlist); /* "." */ 234208951Sjh if (de == NULL) 235208951Sjh return (NULL); 236208951Sjh de = TAILQ_NEXT(de, de_list); /* ".." */ 237208951Sjh if (de == NULL) 238208951Sjh return (NULL); 239208951Sjh 240208951Sjh return (de->de_dir); 241208951Sjh} 242208951Sjh 243208951Sjhstruct devfs_dirent * 244150342Sphkdevfs_vmkdir(struct devfs_mount *dmp, char *name, int namelen, struct devfs_dirent *dotdot, u_int inode) 24564880Sphk{ 24665051Sphk struct devfs_dirent *dd; 24764880Sphk struct devfs_dirent *de; 24864880Sphk 249150342Sphk /* Create the new directory */ 25065051Sphk dd = devfs_newdirent(name, namelen); 25165051Sphk TAILQ_INIT(&dd->de_dlist); 25265051Sphk dd->de_dirent->d_type = DT_DIR; 25385979Sphk dd->de_mode = 0555; 25465051Sphk dd->de_links = 2; 25565051Sphk dd->de_dir = dd; 256150342Sphk if (inode != 0) 257150342Sphk dd->de_inode = inode; 258150342Sphk else 259150342Sphk dd->de_inode = alloc_unr(devfs_inos); 26065051Sphk 261211226Sjh /* 262211226Sjh * "." and ".." are always the two first entries in the 263211226Sjh * de_dlist list. 264211226Sjh * 265211226Sjh * Create the "." entry in the new directory. 266211226Sjh */ 26764880Sphk de = devfs_newdirent(".", 1); 26864880Sphk de->de_dirent->d_type = DT_DIR; 26965051Sphk de->de_flags |= DE_DOT; 27065051Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 271150342Sphk de->de_dir = dd; 27265051Sphk 273211226Sjh /* Create the ".." entry in the new directory. */ 27465051Sphk de = devfs_newdirent("..", 2); 27565051Sphk de->de_dirent->d_type = DT_DIR; 276150342Sphk de->de_flags |= DE_DOTDOT; 277150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 278150342Sphk if (dotdot == NULL) { 27965051Sphk de->de_dir = dd; 280150342Sphk } else { 28165051Sphk de->de_dir = dotdot; 282216461Sjh sx_assert(&dmp->dm_lock, SX_XLOCKED); 283150342Sphk TAILQ_INSERT_TAIL(&dotdot->de_dlist, dd, de_list); 284150342Sphk dotdot->de_links++; 285216461Sjh devfs_rules_apply(dmp, dd); 286150342Sphk } 28765051Sphk 288150342Sphk#ifdef MAC 289172930Srwatson mac_devfs_create_directory(dmp->dm_mount, name, namelen, dd); 290150342Sphk#endif 29164880Sphk return (dd); 29264880Sphk} 29364880Sphk 294150342Sphkvoid 295162398Skibdevfs_dirent_free(struct devfs_dirent *de) 296162398Skib{ 297162398Skib free(de, M_DEVFS3); 298162398Skib} 299162398Skib 300163481Skib/* 301212660Sjh * Removes a directory if it is empty. Also empty parent directories are 302212660Sjh * removed recursively. 303212660Sjh */ 304212660Sjhstatic void 305212660Sjhdevfs_rmdir_empty(struct devfs_mount *dm, struct devfs_dirent *de) 306212660Sjh{ 307212660Sjh struct devfs_dirent *dd, *de_dot, *de_dotdot; 308212660Sjh 309212660Sjh sx_assert(&dm->dm_lock, SX_XLOCKED); 310212660Sjh 311212660Sjh for (;;) { 312212660Sjh KASSERT(de->de_dirent->d_type == DT_DIR, 313212660Sjh ("devfs_rmdir_empty: de is not a directory")); 314212660Sjh 315212660Sjh if ((de->de_flags & DE_DOOMED) != 0 || de == dm->dm_rootdir) 316212660Sjh return; 317212660Sjh 318212660Sjh de_dot = TAILQ_FIRST(&de->de_dlist); 319212660Sjh KASSERT(de_dot != NULL, ("devfs_rmdir_empty: . missing")); 320212660Sjh de_dotdot = TAILQ_NEXT(de_dot, de_list); 321212660Sjh KASSERT(de_dotdot != NULL, ("devfs_rmdir_empty: .. missing")); 322212660Sjh /* Return if the directory is not empty. */ 323212660Sjh if (TAILQ_NEXT(de_dotdot, de_list) != NULL) 324212660Sjh return; 325212660Sjh 326212660Sjh dd = devfs_parent_dirent(de); 327212660Sjh KASSERT(dd != NULL, ("devfs_rmdir_empty: NULL dd")); 328212826Sjh TAILQ_REMOVE(&de->de_dlist, de_dot, de_list); 329212826Sjh TAILQ_REMOVE(&de->de_dlist, de_dotdot, de_list); 330212660Sjh TAILQ_REMOVE(&dd->de_dlist, de, de_list); 331212660Sjh DEVFS_DE_HOLD(dd); 332212660Sjh devfs_delete(dm, de, DEVFS_DEL_NORECURSE); 333212660Sjh devfs_delete(dm, de_dot, DEVFS_DEL_NORECURSE); 334212660Sjh devfs_delete(dm, de_dotdot, DEVFS_DEL_NORECURSE); 335212660Sjh if (DEVFS_DE_DROP(dd)) { 336212660Sjh devfs_dirent_free(dd); 337212660Sjh return; 338212660Sjh } 339212660Sjh 340212660Sjh de = dd; 341212660Sjh } 342212660Sjh} 343212660Sjh 344212660Sjh/* 345163481Skib * The caller needs to hold the dm for the duration of the call since 346163481Skib * dm->dm_lock may be temporary dropped. 347163481Skib */ 348162398Skibvoid 349212660Sjhdevfs_delete(struct devfs_mount *dm, struct devfs_dirent *de, int flags) 35064880Sphk{ 351212660Sjh struct devfs_dirent *dd; 352163481Skib struct vnode *vp; 35364880Sphk 354162398Skib KASSERT((de->de_flags & DE_DOOMED) == 0, 355162398Skib ("devfs_delete doomed dirent")); 356162398Skib de->de_flags |= DE_DOOMED; 357212660Sjh 358212660Sjh if ((flags & DEVFS_DEL_NORECURSE) == 0) { 359212660Sjh dd = devfs_parent_dirent(de); 360212660Sjh if (dd != NULL) 361212660Sjh DEVFS_DE_HOLD(dd); 362213215Sjh if (de->de_flags & DE_USER) { 363213215Sjh KASSERT(dd != NULL, ("devfs_delete: NULL dd")); 364213215Sjh devfs_dir_unref_de(dm, dd); 365213215Sjh } 366212660Sjh } else 367212660Sjh dd = NULL; 368212660Sjh 369163481Skib mtx_lock(&devfs_de_interlock); 370163481Skib vp = de->de_vnode; 371163481Skib if (vp != NULL) { 372163481Skib VI_LOCK(vp); 373163481Skib mtx_unlock(&devfs_de_interlock); 374163481Skib vholdl(vp); 375163481Skib sx_unlock(&dm->dm_lock); 376212660Sjh if ((flags & DEVFS_DEL_VNLOCKED) == 0) 377175202Sattilio vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 378163481Skib else 379163481Skib VI_UNLOCK(vp); 380163481Skib vgone(vp); 381212660Sjh if ((flags & DEVFS_DEL_VNLOCKED) == 0) 382175294Sattilio VOP_UNLOCK(vp, 0); 383163481Skib vdrop(vp); 384163481Skib sx_xlock(&dm->dm_lock); 385163481Skib } else 386163481Skib mtx_unlock(&devfs_de_interlock); 38764880Sphk if (de->de_symlink) { 388150151Sphk free(de->de_symlink, M_DEVFS); 38964880Sphk de->de_symlink = NULL; 39064880Sphk } 391101069Srwatson#ifdef MAC 392172930Srwatson mac_devfs_destroy(de); 393101069Srwatson#endif 394150342Sphk if (de->de_inode > DEVFS_ROOTINO) { 395226041Skib devfs_free_cdp_inode(de->de_inode); 396150342Sphk de->de_inode = 0; 397150342Sphk } 398162398Skib if (DEVFS_DE_DROP(de)) 399162398Skib devfs_dirent_free(de); 400212660Sjh 401212660Sjh if (dd != NULL) { 402212660Sjh if (DEVFS_DE_DROP(dd)) 403212660Sjh devfs_dirent_free(dd); 404212660Sjh else 405212660Sjh devfs_rmdir_empty(dm, dd); 406212660Sjh } 40764880Sphk} 40864880Sphk 409150342Sphk/* 410150342Sphk * Called on unmount. 411163481Skib * Recursively removes the entire tree. 412163481Skib * The caller needs to hold the dm for the duration of the call. 413150342Sphk */ 414150342Sphk 415150342Sphkstatic void 416150342Sphkdevfs_purge(struct devfs_mount *dm, struct devfs_dirent *dd) 41764880Sphk{ 41864880Sphk struct devfs_dirent *de; 41964880Sphk 420150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 421212660Sjh 422212660Sjh DEVFS_DE_HOLD(dd); 42364880Sphk for (;;) { 424213215Sjh /* 425213215Sjh * Use TAILQ_LAST() to remove "." and ".." last. 426213215Sjh * We might need ".." to resolve a path in 427213215Sjh * devfs_dir_unref_de(). 428213215Sjh */ 429213215Sjh de = TAILQ_LAST(&dd->de_dlist, devfs_dlist_head); 43064880Sphk if (de == NULL) 43164880Sphk break; 432150342Sphk TAILQ_REMOVE(&dd->de_dlist, de, de_list); 433213215Sjh if (de->de_flags & DE_USER) 434213215Sjh devfs_dir_unref_de(dm, dd); 435212660Sjh if (de->de_flags & (DE_DOT | DE_DOTDOT)) 436212660Sjh devfs_delete(dm, de, DEVFS_DEL_NORECURSE); 437150342Sphk else if (de->de_dirent->d_type == DT_DIR) 438150342Sphk devfs_purge(dm, de); 439212660Sjh else 440212660Sjh devfs_delete(dm, de, DEVFS_DEL_NORECURSE); 44164880Sphk } 442212660Sjh if (DEVFS_DE_DROP(dd)) 443212660Sjh devfs_dirent_free(dd); 444212660Sjh else if ((dd->de_flags & DE_DOOMED) == 0) 445212660Sjh devfs_delete(dm, dd, DEVFS_DEL_NORECURSE); 44664880Sphk} 44764880Sphk 448150342Sphk/* 449150342Sphk * Each cdev_priv has an array of pointers to devfs_dirent which is indexed 450150342Sphk * by the mount points dm_idx. 451150342Sphk * This function extends the array when necessary, taking into account that 452150342Sphk * the default array is 1 element and not malloc'ed. 453150342Sphk */ 454150342Sphkstatic void 455150342Sphkdevfs_metoo(struct cdev_priv *cdp, struct devfs_mount *dm) 456150342Sphk{ 457150342Sphk struct devfs_dirent **dep; 458150342Sphk int siz; 45964880Sphk 460150342Sphk siz = (dm->dm_idx + 1) * sizeof *dep; 461150342Sphk dep = malloc(siz, M_DEVFS2, M_WAITOK | M_ZERO); 462150342Sphk dev_lock(); 463150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent) { 464150342Sphk /* We got raced */ 465150342Sphk dev_unlock(); 466150342Sphk free(dep, M_DEVFS2); 467150342Sphk return; 468150342Sphk } 469150342Sphk memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep); 470150342Sphk if (cdp->cdp_maxdirent > 0) 471150342Sphk free(cdp->cdp_dirents, M_DEVFS2); 472150342Sphk cdp->cdp_dirents = dep; 473150342Sphk /* 474150342Sphk * XXX: if malloc told us how much we actually got this could 475150342Sphk * XXX: be optimized. 476150342Sphk */ 477150342Sphk cdp->cdp_maxdirent = dm->dm_idx; 478150342Sphk dev_unlock(); 479150342Sphk} 480150342Sphk 481163481Skib/* 482163481Skib * The caller needs to hold the dm for the duration of the call. 483163481Skib */ 484150342Sphkstatic int 485150342Sphkdevfs_populate_loop(struct devfs_mount *dm, int cleanup) 48664880Sphk{ 487150342Sphk struct cdev_priv *cdp; 488150342Sphk struct devfs_dirent *de; 48965051Sphk struct devfs_dirent *dd; 490150342Sphk struct cdev *pdev; 491211226Sjh int de_flags, j; 49264880Sphk char *q, *s; 49364880Sphk 494150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 495150342Sphk dev_lock(); 496150342Sphk TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) { 497150342Sphk 498150342Sphk KASSERT(cdp->cdp_dirents != NULL, ("NULL cdp_dirents")); 499150342Sphk 500150342Sphk /* 501150342Sphk * If we are unmounting, or the device has been destroyed, 502150342Sphk * clean up our dirent. 503150342Sphk */ 504150342Sphk if ((cleanup || !(cdp->cdp_flags & CDP_ACTIVE)) && 505150342Sphk dm->dm_idx <= cdp->cdp_maxdirent && 506150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 507150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 508150342Sphk cdp->cdp_dirents[dm->dm_idx] = NULL; 509150342Sphk KASSERT(cdp == de->de_cdp, 510150342Sphk ("%s %d %s %p %p", __func__, __LINE__, 511150342Sphk cdp->cdp_c.si_name, cdp, de->de_cdp)); 512150342Sphk KASSERT(de->de_dir != NULL, ("Null de->de_dir")); 513150342Sphk dev_unlock(); 514150342Sphk 515150342Sphk TAILQ_REMOVE(&de->de_dir->de_dlist, de, de_list); 516150342Sphk de->de_cdp = NULL; 517150342Sphk de->de_inode = 0; 518163481Skib devfs_delete(dm, de, 0); 519163481Skib dev_lock(); 520163481Skib cdp->cdp_inuse--; 521163481Skib dev_unlock(); 522150342Sphk return (1); 523150342Sphk } 524150342Sphk /* 525150342Sphk * GC any lingering devices 526150342Sphk */ 527150342Sphk if (!(cdp->cdp_flags & CDP_ACTIVE)) { 528150342Sphk if (cdp->cdp_inuse > 0) 52965051Sphk continue; 530150342Sphk TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 531150342Sphk dev_unlock(); 532150342Sphk dev_rel(&cdp->cdp_c); 533150342Sphk return (1); 534150342Sphk } 535150342Sphk /* 536150342Sphk * Don't create any new dirents if we are unmounting 537150342Sphk */ 538150342Sphk if (cleanup) 539150342Sphk continue; 540150342Sphk KASSERT((cdp->cdp_flags & CDP_ACTIVE), ("Bogons, I tell ya'!")); 541150342Sphk 542150342Sphk if (dm->dm_idx <= cdp->cdp_maxdirent && 543150342Sphk cdp->cdp_dirents[dm->dm_idx] != NULL) { 544150342Sphk de = cdp->cdp_dirents[dm->dm_idx]; 545150342Sphk KASSERT(cdp == de->de_cdp, ("inconsistent cdp")); 546150342Sphk continue; 547150342Sphk } 548150342Sphk 549150342Sphk 550150342Sphk cdp->cdp_inuse++; 551150342Sphk dev_unlock(); 552150342Sphk 553150342Sphk if (dm->dm_idx > cdp->cdp_maxdirent) 554150342Sphk devfs_metoo(cdp, dm); 555150342Sphk 556150342Sphk dd = dm->dm_rootdir; 557150342Sphk s = cdp->cdp_c.si_name; 558150342Sphk for (;;) { 559150342Sphk for (q = s; *q != '/' && *q != '\0'; q++) 56064880Sphk continue; 561150342Sphk if (*q != '/') 562150342Sphk break; 563211226Sjh de = devfs_find(dd, s, q - s, 0); 564150342Sphk if (de == NULL) 565150342Sphk de = devfs_vmkdir(dm, s, q - s, dd, 0); 566211226Sjh else if (de->de_dirent->d_type == DT_LNK) { 567211226Sjh de = devfs_find(dd, s, q - s, DT_DIR); 568211226Sjh if (de == NULL) 569211226Sjh de = devfs_vmkdir(dm, s, q - s, dd, 0); 570211226Sjh de->de_flags |= DE_COVERED; 571211226Sjh } 572150342Sphk s = q + 1; 573150342Sphk dd = de; 574211226Sjh KASSERT(dd->de_dirent->d_type == DT_DIR && 575211226Sjh (dd->de_flags & (DE_DOT | DE_DOTDOT)) == 0, 576211226Sjh ("%s: invalid directory (si_name=%s)", 577211226Sjh __func__, cdp->cdp_c.si_name)); 578211226Sjh 579150342Sphk } 580211226Sjh de_flags = 0; 581211226Sjh de = devfs_find(dd, s, q - s, DT_LNK); 582211226Sjh if (de != NULL) 583211226Sjh de_flags |= DE_COVERED; 584150342Sphk 585150342Sphk de = devfs_newdirent(s, q - s); 586150342Sphk if (cdp->cdp_c.si_flags & SI_ALIAS) { 587150342Sphk de->de_uid = 0; 588150342Sphk de->de_gid = 0; 589150342Sphk de->de_mode = 0755; 590150342Sphk de->de_dirent->d_type = DT_LNK; 591150342Sphk pdev = cdp->cdp_c.si_parent; 592150342Sphk j = strlen(pdev->si_name) + 1; 593150342Sphk de->de_symlink = malloc(j, M_DEVFS, M_WAITOK); 594150342Sphk bcopy(pdev->si_name, de->de_symlink, j); 595150342Sphk } else { 596150342Sphk de->de_uid = cdp->cdp_c.si_uid; 597150342Sphk de->de_gid = cdp->cdp_c.si_gid; 598150342Sphk de->de_mode = cdp->cdp_c.si_mode; 599150342Sphk de->de_dirent->d_type = DT_CHR; 600150342Sphk } 601211226Sjh de->de_flags |= de_flags; 602150342Sphk de->de_inode = cdp->cdp_inode; 603150342Sphk de->de_cdp = cdp; 604101069Srwatson#ifdef MAC 605172930Srwatson mac_devfs_create_device(cdp->cdp_c.si_cred, dm->dm_mount, 606150342Sphk &cdp->cdp_c, de); 607101069Srwatson#endif 608150342Sphk de->de_dir = dd; 609150342Sphk TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list); 610150342Sphk devfs_rules_apply(dm, de); 611150342Sphk dev_lock(); 612150342Sphk /* XXX: could check that cdp is still active here */ 613150342Sphk KASSERT(cdp->cdp_dirents[dm->dm_idx] == NULL, 614150342Sphk ("%s %d\n", __func__, __LINE__)); 615150342Sphk cdp->cdp_dirents[dm->dm_idx] = de; 616150342Sphk KASSERT(de->de_cdp != (void *)0xdeadc0de, 617150342Sphk ("%s %d\n", __func__, __LINE__)); 618150342Sphk dev_unlock(); 619150342Sphk return (1); 62064880Sphk } 621150342Sphk dev_unlock(); 622150342Sphk return (0); 62364880Sphk} 62464880Sphk 625163481Skib/* 626163481Skib * The caller needs to hold the dm for the duration of the call. 627163481Skib */ 628150342Sphkvoid 629150342Sphkdevfs_populate(struct devfs_mount *dm) 630150342Sphk{ 631224743Skib unsigned gen; 632150342Sphk 633150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 634224743Skib gen = devfs_generation; 635224743Skib if (dm->dm_generation == gen) 636150342Sphk return; 637150342Sphk while (devfs_populate_loop(dm, 0)) 638150342Sphk continue; 639224743Skib dm->dm_generation = gen; 640150342Sphk} 641150342Sphk 642163481Skib/* 643163481Skib * The caller needs to hold the dm for the duration of the call. 644163481Skib */ 645150342Sphkvoid 646150342Sphkdevfs_cleanup(struct devfs_mount *dm) 647150342Sphk{ 648150342Sphk 649150342Sphk sx_assert(&dm->dm_lock, SX_XLOCKED); 650150342Sphk while (devfs_populate_loop(dm, 1)) 651150342Sphk continue; 652150342Sphk devfs_purge(dm, dm->dm_rootdir); 653150342Sphk} 654150342Sphk 655130678Sphk/* 656130678Sphk * devfs_create() and devfs_destroy() are called from kern_conf.c and 657130678Sphk * in both cases the devlock() mutex is held, so no further locking 658249583Sgabor * is necessary and no sleeping allowed. 659130678Sphk */ 660130678Sphk 661111730Sphkvoid 662130585Sphkdevfs_create(struct cdev *dev) 66364880Sphk{ 664150342Sphk struct cdev_priv *cdp; 66565515Sphk 666150342Sphk mtx_assert(&devmtx, MA_OWNED); 667179828Skib cdp = cdev2priv(dev); 668150342Sphk cdp->cdp_flags |= CDP_ACTIVE; 669150342Sphk cdp->cdp_inode = alloc_unrl(devfs_inos); 670150342Sphk dev_refl(dev); 671150342Sphk TAILQ_INSERT_TAIL(&cdevp_list, cdp, cdp_list); 672130678Sphk devfs_generation++; 67364880Sphk} 67464880Sphk 675111730Sphkvoid 676130585Sphkdevfs_destroy(struct cdev *dev) 67764880Sphk{ 678150342Sphk struct cdev_priv *cdp; 67965515Sphk 680150342Sphk mtx_assert(&devmtx, MA_OWNED); 681179828Skib cdp = cdev2priv(dev); 682150342Sphk cdp->cdp_flags &= ~CDP_ACTIVE; 683130678Sphk devfs_generation++; 68464880Sphk} 685150342Sphk 686226041Skibino_t 687226041Skibdevfs_alloc_cdp_inode(void) 688226041Skib{ 689226041Skib 690226041Skib return (alloc_unr(devfs_inos)); 691226041Skib} 692226041Skib 693226041Skibvoid 694226041Skibdevfs_free_cdp_inode(ino_t ino) 695226041Skib{ 696226041Skib 697226041Skib if (ino > 0) 698226041Skib free_unr(devfs_inos, ino); 699226041Skib} 700226041Skib 701150342Sphkstatic void 702150342Sphkdevfs_devs_init(void *junk __unused) 703150342Sphk{ 704150342Sphk 705150342Sphk devfs_inos = new_unrhdr(DEVFS_ROOTINO + 1, INT_MAX, &devmtx); 706150342Sphk} 707150342Sphk 708150342SphkSYSINIT(devfs_devs, SI_SUB_DEVFS, SI_ORDER_FIRST, devfs_devs_init, NULL); 709