devfs_vnops.c revision 273462
1224762Smarius/*- 2214921Scognet * Copyright (c) 2000-2004 3214921Scognet * Poul-Henning Kamp. All rights reserved. 4214921Scognet * Copyright (c) 1989, 1992-1993, 1995 5214921Scognet * The Regents of the University of California. All rights reserved. 6214921Scognet * 7214921Scognet * This code is derived from software donated to Berkeley by 8214921Scognet * Jan-Simon Pendry. 9214921Scognet * 10214921Scognet * Redistribution and use in source and binary forms, with or without 11214921Scognet * modification, are permitted provided that the following conditions 12214921Scognet * are met: 13214921Scognet * 1. Redistributions of source code must retain the above copyright 14214921Scognet * notice, this list of conditions and the following disclaimer. 15214921Scognet * 2. Neither the name of the University nor the names of its contributors 16214921Scognet * may be used to endorse or promote products derived from this software 17214921Scognet * without specific prior written permission. 18214921Scognet * 19214921Scognet * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20214921Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21214921Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22214921Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23214921Scognet * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24214921Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25214921Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26214921Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27214921Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28214921Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29214921Scognet * SUCH DAMAGE. 30214921Scognet * 31214921Scognet * @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95 32214921Scognet * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43 33214921Scognet * 34214921Scognet * $FreeBSD: stable/10/sys/fs/devfs/devfs_vnops.c 273462 2014-10-22 09:09:41Z kib $ 35214921Scognet */ 36214921Scognet 37214921Scognet/* 38214921Scognet * TODO: 39214921Scognet * mkdir: want it ? 40214921Scognet */ 41214921Scognet 42214921Scognet#include <sys/param.h> 43214921Scognet#include <sys/systm.h> 44214921Scognet#include <sys/conf.h> 45214921Scognet#include <sys/dirent.h> 46214921Scognet#include <sys/fcntl.h> 47214921Scognet#include <sys/file.h> 48214921Scognet#include <sys/filedesc.h> 49214921Scognet#include <sys/filio.h> 50214921Scognet#include <sys/jail.h> 51214921Scognet#include <sys/kernel.h> 52214921Scognet#include <sys/lock.h> 53214921Scognet#include <sys/malloc.h> 54214921Scognet#include <sys/mount.h> 55214921Scognet#include <sys/namei.h> 56214921Scognet#include <sys/priv.h> 57214921Scognet#include <sys/proc.h> 58214921Scognet#include <sys/stat.h> 59214921Scognet#include <sys/sx.h> 60214921Scognet#include <sys/time.h> 61214921Scognet#include <sys/ttycom.h> 62214921Scognet#include <sys/unistd.h> 63214921Scognet#include <sys/vnode.h> 64214921Scognet 65214921Scognetstatic struct vop_vector devfs_vnodeops; 66214921Scognetstatic struct vop_vector devfs_specops; 67214921Scognetstatic struct fileops devfs_ops_f; 68214921Scognet 69214921Scognet#include <fs/devfs/devfs.h> 70214921Scognet#include <fs/devfs/devfs_int.h> 71214921Scognet 72214921Scognet#include <security/mac/mac_framework.h> 73214921Scognet 74214921Scognetstatic MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); 75214921Scognet 76214921Scognetstruct mtx devfs_de_interlock; 77214921ScognetMTX_SYSINIT(devfs_de_interlock, &devfs_de_interlock, "devfs interlock", MTX_DEF); 78214921Scognetstruct sx clone_drain_lock; 79214921ScognetSX_SYSINIT(clone_drain_lock, &clone_drain_lock, "clone events drain lock"); 80214921Scognetstruct mtx cdevpriv_mtx; 81214921ScognetMTX_SYSINIT(cdevpriv_mtx, &cdevpriv_mtx, "cdevpriv lock", MTX_DEF); 82214921Scognet 83214921Scognetstatic int 84214921Scognetdevfs_fp_check(struct file *fp, struct cdev **devp, struct cdevsw **dswp, 85214921Scognet int *ref) 86214921Scognet{ 87214921Scognet 88214921Scognet *dswp = devvn_refthread(fp->f_vnode, devp, ref); 89214921Scognet if (*devp != fp->f_data) { 90214921Scognet if (*dswp != NULL) 91214921Scognet dev_relthread(*devp, *ref); 92214921Scognet return (ENXIO); 93214921Scognet } 94214921Scognet KASSERT((*devp)->si_refcount > 0, 95214921Scognet ("devfs: un-referenced struct cdev *(%s)", devtoname(*devp))); 96214921Scognet if (*dswp == NULL) 97214921Scognet return (ENXIO); 98214921Scognet curthread->td_fpop = fp; 99214921Scognet return (0); 100214921Scognet} 101214921Scognet 102214921Scognetint 103214921Scognetdevfs_get_cdevpriv(void **datap) 104214921Scognet{ 105214921Scognet struct file *fp; 106214921Scognet struct cdev_privdata *p; 107214921Scognet int error; 108214921Scognet 109214921Scognet fp = curthread->td_fpop; 110214921Scognet if (fp == NULL) 111214921Scognet return (EBADF); 112214921Scognet p = fp->f_cdevpriv; 113214921Scognet if (p != NULL) { 114214921Scognet error = 0; 115214921Scognet *datap = p->cdpd_data; 116214921Scognet } else 117214921Scognet error = ENOENT; 118214921Scognet return (error); 119214921Scognet} 120214921Scognet 121214921Scognetint 122214921Scognetdevfs_set_cdevpriv(void *priv, cdevpriv_dtr_t priv_dtr) 123214921Scognet{ 124214921Scognet struct file *fp; 125214921Scognet struct cdev_priv *cdp; 126214921Scognet struct cdev_privdata *p; 127214921Scognet int error; 128214921Scognet 129214921Scognet fp = curthread->td_fpop; 130224762Smarius if (fp == NULL) 131214921Scognet return (ENOENT); 132214921Scognet cdp = cdev2priv((struct cdev *)fp->f_data); 133214921Scognet p = malloc(sizeof(struct cdev_privdata), M_CDEVPDATA, M_WAITOK); 134214921Scognet p->cdpd_data = priv; 135214921Scognet p->cdpd_dtr = priv_dtr; 136214921Scognet p->cdpd_fp = fp; 137214921Scognet mtx_lock(&cdevpriv_mtx); 138214921Scognet if (fp->f_cdevpriv == NULL) { 139214921Scognet LIST_INSERT_HEAD(&cdp->cdp_fdpriv, p, cdpd_list); 140214921Scognet fp->f_cdevpriv = p; 141214921Scognet mtx_unlock(&cdevpriv_mtx); 142214921Scognet error = 0; 143214921Scognet } else { 144214921Scognet mtx_unlock(&cdevpriv_mtx); 145214921Scognet free(p, M_CDEVPDATA); 146214921Scognet error = EBUSY; 147214921Scognet } 148214921Scognet return (error); 149214921Scognet} 150214921Scognet 151214921Scognetvoid 152214921Scognetdevfs_destroy_cdevpriv(struct cdev_privdata *p) 153214921Scognet{ 154214921Scognet 155214921Scognet mtx_assert(&cdevpriv_mtx, MA_OWNED); 156214921Scognet p->cdpd_fp->f_cdevpriv = NULL; 157214921Scognet LIST_REMOVE(p, cdpd_list); 158214921Scognet mtx_unlock(&cdevpriv_mtx); 159214921Scognet (p->cdpd_dtr)(p->cdpd_data); 160214921Scognet free(p, M_CDEVPDATA); 161214921Scognet} 162214921Scognet 163214921Scognetvoid 164214921Scognetdevfs_fpdrop(struct file *fp) 165214921Scognet{ 166293290Sbdrewery struct cdev_privdata *p; 167214921Scognet 168214921Scognet mtx_lock(&cdevpriv_mtx); 169214921Scognet if ((p = fp->f_cdevpriv) == NULL) { 170214921Scognet mtx_unlock(&cdevpriv_mtx); 171214921Scognet return; 172214921Scognet } 173214921Scognet devfs_destroy_cdevpriv(p); 174214921Scognet} 175214921Scognet 176214921Scognetvoid 177214921Scognetdevfs_clear_cdevpriv(void) 178214921Scognet{ 179214921Scognet struct file *fp; 180214921Scognet 181214921Scognet fp = curthread->td_fpop; 182214921Scognet if (fp == NULL) 183214921Scognet return; 184214921Scognet devfs_fpdrop(fp); 185214921Scognet} 186214921Scognet 187214921Scognet/* 188214921Scognet * On success devfs_populate_vp() returns with dmp->dm_lock held. 189214921Scognet */ 190214921Scognetstatic int 191214921Scognetdevfs_populate_vp(struct vnode *vp) 192214921Scognet{ 193214921Scognet struct devfs_dirent *de; 194214921Scognet struct devfs_mount *dmp; 195214921Scognet int locked; 196214921Scognet 197214921Scognet ASSERT_VOP_LOCKED(vp, "devfs_populate_vp"); 198214921Scognet 199214921Scognet dmp = VFSTODEVFS(vp->v_mount); 200214921Scognet locked = VOP_ISLOCKED(vp); 201214921Scognet 202214921Scognet sx_xlock(&dmp->dm_lock); 203214921Scognet DEVFS_DMP_HOLD(dmp); 204214921Scognet 205214921Scognet /* Can't call devfs_populate() with the vnode lock held. */ 206214921Scognet VOP_UNLOCK(vp, 0); 207214921Scognet devfs_populate(dmp); 208214921Scognet 209214921Scognet sx_xunlock(&dmp->dm_lock); 210222191Snwhitehorn vn_lock(vp, locked | LK_RETRY); 211214921Scognet sx_xlock(&dmp->dm_lock); 212214921Scognet if (DEVFS_DMP_DROP(dmp)) { 213214921Scognet sx_xunlock(&dmp->dm_lock); 214214921Scognet devfs_unmount_final(dmp); 215214921Scognet return (EBADF); 216214921Scognet } 217214921Scognet if ((vp->v_iflag & VI_DOOMED) != 0) { 218214921Scognet sx_xunlock(&dmp->dm_lock); 219214921Scognet return (EBADF); 220214921Scognet } 221214921Scognet de = vp->v_data; 222214921Scognet KASSERT(de != NULL, 223214921Scognet ("devfs_populate_vp: vp->v_data == NULL but vnode not doomed")); 224214921Scognet if ((de->de_flags & DE_DOOMED) != 0) { 225214921Scognet sx_xunlock(&dmp->dm_lock); 226214921Scognet return (EBADF); 227214921Scognet } 228214921Scognet 229224690Smm return (0); 230224690Smm} 231224690Smm 232214921Scognetstatic int 233253707Smariusdevfs_vptocnp(struct vop_vptocnp_args *ap) 234214921Scognet{ 235214921Scognet struct vnode *vp = ap->a_vp; 236214921Scognet struct vnode **dvp = ap->a_vpp; 237214921Scognet struct devfs_mount *dmp; 238214921Scognet char *buf = ap->a_buf; 239214921Scognet int *buflen = ap->a_buflen; 240214921Scognet struct devfs_dirent *dd, *de; 241214921Scognet int i, error; 242214921Scognet 243214921Scognet dmp = VFSTODEVFS(vp->v_mount); 244214921Scognet 245214921Scognet error = devfs_populate_vp(vp); 246214921Scognet if (error != 0) 247214921Scognet return (error); 248214921Scognet 249214921Scognet i = *buflen; 250214921Scognet dd = vp->v_data; 251214921Scognet 252214921Scognet if (vp->v_type == VCHR) { 253214921Scognet i -= strlen(dd->de_cdp->cdp_c.si_name); 254214921Scognet if (i < 0) { 255214921Scognet error = ENOMEM; 256214921Scognet goto finished; 257214921Scognet } 258214921Scognet bcopy(dd->de_cdp->cdp_c.si_name, buf + i, 259214921Scognet strlen(dd->de_cdp->cdp_c.si_name)); 260214921Scognet de = dd->de_dir; 261214921Scognet } else if (vp->v_type == VDIR) { 262214921Scognet if (dd == dmp->dm_rootdir) { 263214921Scognet *dvp = vp; 264214921Scognet vref(*dvp); 265214921Scognet goto finished; 266214921Scognet } 267214921Scognet i -= dd->de_dirent->d_namlen; 268214921Scognet if (i < 0) { 269214921Scognet error = ENOMEM; 270214921Scognet goto finished; 271214921Scognet } 272214921Scognet bcopy(dd->de_dirent->d_name, buf + i, 273214921Scognet dd->de_dirent->d_namlen); 274214921Scognet de = dd; 275214921Scognet } else { 276214921Scognet error = ENOENT; 277214921Scognet goto finished; 278214921Scognet } 279214921Scognet *buflen = i; 280214921Scognet de = devfs_parent_dirent(de); 281214921Scognet if (de == NULL) { 282214921Scognet error = ENOENT; 283214921Scognet goto finished; 284214921Scognet } 285214921Scognet mtx_lock(&devfs_de_interlock); 286214921Scognet *dvp = de->de_vnode; 287214921Scognet if (*dvp != NULL) { 288214921Scognet VI_LOCK(*dvp); 289214921Scognet mtx_unlock(&devfs_de_interlock); 290214921Scognet vholdl(*dvp); 291214921Scognet VI_UNLOCK(*dvp); 292214921Scognet vref(*dvp); 293214921Scognet vdrop(*dvp); 294214921Scognet } else { 295214921Scognet mtx_unlock(&devfs_de_interlock); 296214921Scognet error = ENOENT; 297214921Scognet } 298214921Scognetfinished: 299290595Sngie sx_xunlock(&dmp->dm_lock); 300290595Sngie return (error); 301214921Scognet} 302214921Scognet 303214921Scognet/* 304214921Scognet * Construct the fully qualified path name relative to the mountpoint. 305214921Scognet * If a NULL cnp is provided, no '/' is appended to the resulting path. 306214921Scognet */ 307214921Scognetchar * 308214921Scognetdevfs_fqpn(char *buf, struct devfs_mount *dmp, struct devfs_dirent *dd, 309214921Scognet struct componentname *cnp) 310214921Scognet{ 311214921Scognet int i; 312214921Scognet struct devfs_dirent *de; 313214921Scognet 314214921Scognet sx_assert(&dmp->dm_lock, SA_LOCKED); 315214921Scognet 316214921Scognet i = SPECNAMELEN; 317214921Scognet buf[i] = '\0'; 318214921Scognet if (cnp != NULL) 319214921Scognet i -= cnp->cn_namelen; 320214921Scognet if (i < 0) 321214921Scognet return (NULL); 322214921Scognet if (cnp != NULL) 323214921Scognet bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen); 324214921Scognet de = dd; 325214921Scognet while (de != dmp->dm_rootdir) { 326214921Scognet if (cnp != NULL || i < SPECNAMELEN) { 327214921Scognet i--; 328214921Scognet if (i < 0) 329214921Scognet return (NULL); 330214921Scognet buf[i] = '/'; 331214921Scognet } 332214921Scognet i -= de->de_dirent->d_namlen; 333214921Scognet if (i < 0) 334214921Scognet return (NULL); 335214921Scognet bcopy(de->de_dirent->d_name, buf + i, 336214921Scognet de->de_dirent->d_namlen); 337214921Scognet de = devfs_parent_dirent(de); 338214921Scognet if (de == NULL) 339214921Scognet return (NULL); 340214921Scognet } 341214921Scognet return (buf + i); 342214921Scognet} 343214921Scognet 344214921Scognetstatic int 345214921Scognetdevfs_allocv_drop_refs(int drop_dm_lock, struct devfs_mount *dmp, 346214921Scognet struct devfs_dirent *de) 347214921Scognet{ 348214921Scognet int not_found; 349214921Scognet 350214921Scognet not_found = 0; 351214921Scognet if (de->de_flags & DE_DOOMED) 352214921Scognet not_found = 1; 353214921Scognet if (DEVFS_DE_DROP(de)) { 354214921Scognet KASSERT(not_found == 1, ("DEVFS de dropped but not doomed")); 355214921Scognet devfs_dirent_free(de); 356214921Scognet } 357214921Scognet if (DEVFS_DMP_DROP(dmp)) { 358214921Scognet KASSERT(not_found == 1, 359214921Scognet ("DEVFS mount struct freed before dirent")); 360214921Scognet not_found = 2; 361214921Scognet sx_xunlock(&dmp->dm_lock); 362214921Scognet devfs_unmount_final(dmp); 363214921Scognet } 364214921Scognet if (not_found == 1 || (drop_dm_lock && not_found != 2)) 365214921Scognet sx_unlock(&dmp->dm_lock); 366214921Scognet return (not_found); 367214921Scognet} 368214921Scognet 369214921Scognetstatic void 370214921Scognetdevfs_insmntque_dtr(struct vnode *vp, void *arg) 371214921Scognet{ 372214921Scognet struct devfs_dirent *de; 373214921Scognet 374214921Scognet de = (struct devfs_dirent *)arg; 375214921Scognet mtx_lock(&devfs_de_interlock); 376214921Scognet vp->v_data = NULL; 377214921Scognet de->de_vnode = NULL; 378214921Scognet mtx_unlock(&devfs_de_interlock); 379214921Scognet vgone(vp); 380214921Scognet vput(vp); 381214921Scognet} 382214921Scognet 383214921Scognet/* 384214921Scognet * devfs_allocv shall be entered with dmp->dm_lock held, and it drops 385214921Scognet * it on return. 386214921Scognet */ 387214921Scognetint 388214921Scognetdevfs_allocv(struct devfs_dirent *de, struct mount *mp, int lockmode, 389214921Scognet struct vnode **vpp) 390214921Scognet{ 391214921Scognet int error; 392214921Scognet struct vnode *vp; 393214921Scognet struct cdev *dev; 394222191Snwhitehorn struct devfs_mount *dmp; 395222191Snwhitehorn struct cdevsw *dsw; 396214921Scognet 397214921Scognet dmp = VFSTODEVFS(mp); 398214921Scognet if (de->de_flags & DE_DOOMED) { 399214921Scognet sx_xunlock(&dmp->dm_lock); 400214921Scognet return (ENOENT); 401214921Scognet } 402214921Scognetloop: 403214921Scognet DEVFS_DE_HOLD(de); 404214921Scognet DEVFS_DMP_HOLD(dmp); 405214921Scognet mtx_lock(&devfs_de_interlock); 406214921Scognet vp = de->de_vnode; 407214921Scognet if (vp != NULL) { 408214921Scognet VI_LOCK(vp); 409214921Scognet mtx_unlock(&devfs_de_interlock); 410214921Scognet sx_xunlock(&dmp->dm_lock); 411214921Scognet vget(vp, lockmode | LK_INTERLOCK | LK_RETRY, curthread); 412214921Scognet sx_xlock(&dmp->dm_lock); 413214921Scognet if (devfs_allocv_drop_refs(0, dmp, de)) { 414214921Scognet vput(vp); 415214921Scognet return (ENOENT); 416214921Scognet } 417214921Scognet else if ((vp->v_iflag & VI_DOOMED) != 0) { 418214921Scognet mtx_lock(&devfs_de_interlock); 419214921Scognet if (de->de_vnode == vp) { 420214921Scognet de->de_vnode = NULL; 421214921Scognet vp->v_data = NULL; 422214921Scognet } 423214921Scognet mtx_unlock(&devfs_de_interlock); 424214921Scognet vput(vp); 425214921Scognet goto loop; 426214921Scognet } 427214921Scognet sx_xunlock(&dmp->dm_lock); 428214921Scognet *vpp = vp; 429214921Scognet return (0); 430214921Scognet } 431289989Sngie mtx_unlock(&devfs_de_interlock); 432214921Scognet if (de->de_dirent->d_type == DT_CHR) { 433214921Scognet if (!(de->de_cdp->cdp_flags & CDP_ACTIVE)) { 434214921Scognet devfs_allocv_drop_refs(1, dmp, de); 435214921Scognet return (ENOENT); 436214921Scognet } 437214921Scognet dev = &de->de_cdp->cdp_c; 438214921Scognet } else { 439214921Scognet dev = NULL; 440214921Scognet } 441214921Scognet error = getnewvnode("devfs", mp, &devfs_vnodeops, &vp); 442214921Scognet if (error != 0) { 443214921Scognet devfs_allocv_drop_refs(1, dmp, de); 444214921Scognet printf("devfs_allocv: failed to allocate new vnode\n"); 445214921Scognet return (error); 446214921Scognet } 447214921Scognet 448214921Scognet if (de->de_dirent->d_type == DT_CHR) { 449214921Scognet vp->v_type = VCHR; 450214921Scognet VI_LOCK(vp); 451214921Scognet dev_lock(); 452214921Scognet dev_refl(dev); 453214921Scognet /* XXX: v_rdev should be protect by vnode lock */ 454214921Scognet vp->v_rdev = dev; 455214921Scognet KASSERT(vp->v_usecount == 1, 456214921Scognet ("%s %d (%d)\n", __func__, __LINE__, vp->v_usecount)); 457214921Scognet dev->si_usecount += vp->v_usecount; 458214921Scognet /* Special casing of ttys for deadfs. Probably redundant. */ 459214921Scognet dsw = dev->si_devsw; 460214921Scognet if (dsw != NULL && (dsw->d_flags & D_TTY) != 0) 461214921Scognet vp->v_vflag |= VV_ISTTY; 462214921Scognet dev_unlock(); 463214921Scognet VI_UNLOCK(vp); 464214921Scognet if ((dev->si_flags & SI_ETERNAL) != 0) 465214921Scognet vp->v_vflag |= VV_ETERNALDEV; 466214921Scognet vp->v_op = &devfs_specops; 467214921Scognet } else if (de->de_dirent->d_type == DT_DIR) { 468214921Scognet vp->v_type = VDIR; 469214921Scognet } else if (de->de_dirent->d_type == DT_LNK) { 470214921Scognet vp->v_type = VLNK; 471214921Scognet } else { 472214921Scognet vp->v_type = VBAD; 473214921Scognet } 474214921Scognet vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_NOWITNESS); 475214921Scognet VN_LOCK_ASHARE(vp); 476214921Scognet mtx_lock(&devfs_de_interlock); 477214921Scognet vp->v_data = de; 478214921Scognet de->de_vnode = vp; 479214921Scognet mtx_unlock(&devfs_de_interlock); 480214921Scognet error = insmntque1(vp, mp, devfs_insmntque_dtr, de); 481214921Scognet if (error != 0) { 482214921Scognet (void) devfs_allocv_drop_refs(1, dmp, de); 483214921Scognet return (error); 484214921Scognet } 485214921Scognet if (devfs_allocv_drop_refs(0, dmp, de)) { 486214921Scognet vput(vp); 487214921Scognet return (ENOENT); 488214921Scognet } 489214921Scognet#ifdef MAC 490214921Scognet mac_devfs_vnode_associate(mp, de, vp); 491214921Scognet#endif 492214921Scognet sx_xunlock(&dmp->dm_lock); 493214921Scognet *vpp = vp; 494214921Scognet return (0); 495214921Scognet} 496214921Scognet 497214921Scognetstatic int 498214921Scognetdevfs_access(struct vop_access_args *ap) 499214921Scognet{ 500214921Scognet struct vnode *vp = ap->a_vp; 501214921Scognet struct devfs_dirent *de; 502214921Scognet int error; 503214921Scognet 504214921Scognet de = vp->v_data; 505214921Scognet if (vp->v_type == VDIR) 506214921Scognet de = de->de_dir; 507214921Scognet 508214921Scognet error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid, 509214921Scognet ap->a_accmode, ap->a_cred, NULL); 510214921Scognet if (error == 0) 511214921Scognet return (0); 512214921Scognet if (error != EACCES) 513214921Scognet return (error); 514214921Scognet /* We do, however, allow access to the controlling terminal */ 515214921Scognet if (!(ap->a_td->td_proc->p_flag & P_CONTROLT)) 516214921Scognet return (error); 517214921Scognet if (ap->a_td->td_proc->p_session->s_ttydp == de->de_cdp) 518214921Scognet return (0); 519214921Scognet return (error); 520214921Scognet} 521214921Scognet 522214921Scognet/* ARGSUSED */ 523214921Scognetstatic int 524214921Scognetdevfs_close(struct vop_close_args *ap) 525214921Scognet{ 526214921Scognet struct vnode *vp = ap->a_vp, *oldvp; 527214921Scognet struct thread *td = ap->a_td; 528214921Scognet struct cdev *dev = vp->v_rdev; 529214921Scognet struct cdevsw *dsw; 530214921Scognet int vp_locked, error, ref; 531214921Scognet 532214921Scognet /* 533214921Scognet * XXX: Don't call d_close() if we were called because of 534214921Scognet * XXX: insmntque1() failure. 535214921Scognet */ 536214921Scognet if (vp->v_data == NULL) 537214921Scognet return (0); 538214921Scognet 539214921Scognet /* 540214921Scognet * Hack: a tty device that is a controlling terminal 541214921Scognet * has a reference from the session structure. 542214921Scognet * We cannot easily tell that a character device is 543214921Scognet * a controlling terminal, unless it is the closing 544214921Scognet * process' controlling terminal. In that case, 545214921Scognet * if the reference count is 2 (this last descriptor 546214921Scognet * plus the session), release the reference from the session. 547214921Scognet */ 548214921Scognet oldvp = NULL; 549214921Scognet sx_xlock(&proctree_lock); 550214921Scognet if (td && vp == td->td_proc->p_session->s_ttyvp) { 551214921Scognet SESS_LOCK(td->td_proc->p_session); 552214921Scognet VI_LOCK(vp); 553214921Scognet if (count_dev(dev) == 2 && (vp->v_iflag & VI_DOOMED) == 0) { 554214921Scognet td->td_proc->p_session->s_ttyvp = NULL; 555214921Scognet td->td_proc->p_session->s_ttydp = NULL; 556214921Scognet oldvp = vp; 557214921Scognet } 558214921Scognet VI_UNLOCK(vp); 559214921Scognet SESS_UNLOCK(td->td_proc->p_session); 560214921Scognet } 561214921Scognet sx_xunlock(&proctree_lock); 562214921Scognet if (oldvp != NULL) 563214921Scognet vrele(oldvp); 564214921Scognet /* 565214921Scognet * We do not want to really close the device if it 566214921Scognet * is still in use unless we are trying to close it 567214921Scognet * forcibly. Since every use (buffer, vnode, swap, cmap) 568214921Scognet * holds a reference to the vnode, and because we mark 569214921Scognet * any other vnodes that alias this device, when the 570214921Scognet * sum of the reference counts on all the aliased 571214921Scognet * vnodes descends to one, we are on last close. 572214921Scognet */ 573214921Scognet dsw = dev_refthread(dev, &ref); 574214921Scognet if (dsw == NULL) 575214921Scognet return (ENXIO); 576214921Scognet VI_LOCK(vp); 577214921Scognet if (vp->v_iflag & VI_DOOMED) { 578214921Scognet /* Forced close. */ 579214921Scognet } else if (dsw->d_flags & D_TRACKCLOSE) { 580214921Scognet /* Keep device updated on status. */ 581214921Scognet } else if (count_dev(dev) > 1) { 582214921Scognet VI_UNLOCK(vp); 583214921Scognet dev_relthread(dev, ref); 584214921Scognet return (0); 585214921Scognet } 586214921Scognet vholdl(vp); 587214921Scognet VI_UNLOCK(vp); 588214921Scognet vp_locked = VOP_ISLOCKED(vp); 589214921Scognet VOP_UNLOCK(vp, 0); 590214921Scognet KASSERT(dev->si_refcount > 0, 591214921Scognet ("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev))); 592214921Scognet error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td); 593214921Scognet dev_relthread(dev, ref); 594214921Scognet vn_lock(vp, vp_locked | LK_RETRY); 595214921Scognet vdrop(vp); 596214921Scognet return (error); 597214921Scognet} 598214921Scognet 599214921Scognetstatic int 600214921Scognetdevfs_close_f(struct file *fp, struct thread *td) 601214921Scognet{ 602214921Scognet int error; 603214921Scognet struct file *fpop; 604214921Scognet 605214921Scognet /* 606214921Scognet * NB: td may be NULL if this descriptor is closed due to 607214921Scognet * garbage collection from a closed UNIX domain socket. 608214921Scognet */ 609214921Scognet fpop = curthread->td_fpop; 610214921Scognet curthread->td_fpop = fp; 611214921Scognet error = vnops.fo_close(fp, td); 612214921Scognet curthread->td_fpop = fpop; 613214921Scognet 614214921Scognet /* 615214921Scognet * The f_cdevpriv cannot be assigned non-NULL value while we 616214921Scognet * are destroying the file. 617214921Scognet */ 618214921Scognet if (fp->f_cdevpriv != NULL) 619214921Scognet devfs_fpdrop(fp); 620214921Scognet return (error); 621214921Scognet} 622214921Scognet 623214921Scognetstatic int 624214921Scognetdevfs_fsync(struct vop_fsync_args *ap) 625214921Scognet{ 626214921Scognet int error; 627214921Scognet struct bufobj *bo; 628214921Scognet struct devfs_dirent *de; 629214921Scognet 630214921Scognet if (!vn_isdisk(ap->a_vp, &error)) { 631214921Scognet bo = &ap->a_vp->v_bufobj; 632214921Scognet de = ap->a_vp->v_data; 633214921Scognet if (error == ENXIO && bo->bo_dirty.bv_cnt > 0) { 634214921Scognet printf("Device %s went missing before all of the data " 635214921Scognet "could be written to it; expect data loss.\n", 636214921Scognet de->de_dirent->d_name); 637214921Scognet 638214921Scognet error = vop_stdfsync(ap); 639214921Scognet if (bo->bo_dirty.bv_cnt != 0 || error != 0) 640214921Scognet panic("devfs_fsync: vop_stdfsync failed."); 641214921Scognet } 642214921Scognet 643214921Scognet return (0); 644214921Scognet } 645214921Scognet 646214921Scognet return (vop_stdfsync(ap)); 647214921Scognet} 648214921Scognet 649214921Scognetstatic int 650214921Scognetdevfs_getattr(struct vop_getattr_args *ap) 651214921Scognet{ 652214921Scognet struct vnode *vp = ap->a_vp; 653214921Scognet struct vattr *vap = ap->a_vap; 654214921Scognet int error; 655214921Scognet struct devfs_dirent *de; 656214921Scognet struct devfs_mount *dmp; 657214921Scognet struct cdev *dev; 658214921Scognet 659214921Scognet error = devfs_populate_vp(vp); 660214921Scognet if (error != 0) 661214921Scognet return (error); 662214921Scognet 663214921Scognet dmp = VFSTODEVFS(vp->v_mount); 664224690Smm sx_xunlock(&dmp->dm_lock); 665214921Scognet 666224690Smm de = vp->v_data; 667214921Scognet KASSERT(de != NULL, ("Null dirent in devfs_getattr vp=%p", vp)); 668224690Smm if (vp->v_type == VDIR) { 669214921Scognet de = de->de_dir; 670214921Scognet KASSERT(de != NULL, 671214921Scognet ("Null dir dirent in devfs_getattr vp=%p", vp)); 672214921Scognet } 673214921Scognet vap->va_uid = de->de_uid; 674214921Scognet vap->va_gid = de->de_gid; 675214921Scognet vap->va_mode = de->de_mode; 676214921Scognet if (vp->v_type == VLNK) 677214921Scognet vap->va_size = strlen(de->de_symlink); 678214921Scognet else if (vp->v_type == VDIR) 679214921Scognet vap->va_size = vap->va_bytes = DEV_BSIZE; 680214921Scognet else 681214921Scognet vap->va_size = 0; 682214921Scognet if (vp->v_type != VDIR) 683253707Smarius vap->va_bytes = 0; 684253707Smarius vap->va_blocksize = DEV_BSIZE; 685214921Scognet vap->va_type = vp->v_type; 686214921Scognet 687214921Scognet#define fix(aa) \ 688214921Scognet do { \ 689214921Scognet if ((aa).tv_sec <= 3600) { \ 690214921Scognet (aa).tv_sec = boottime.tv_sec; \ 691214921Scognet (aa).tv_nsec = boottime.tv_usec * 1000; \ 692214921Scognet } \ 693214921Scognet } while (0) 694214921Scognet 695214921Scognet if (vp->v_type != VCHR) { 696214921Scognet fix(de->de_atime); 697214921Scognet vap->va_atime = de->de_atime; 698214921Scognet fix(de->de_mtime); 699214921Scognet vap->va_mtime = de->de_mtime; 700214921Scognet fix(de->de_ctime); 701214921Scognet vap->va_ctime = de->de_ctime; 702214921Scognet } else { 703214921Scognet dev = vp->v_rdev; 704214921Scognet fix(dev->si_atime); 705214921Scognet vap->va_atime = dev->si_atime; 706214921Scognet fix(dev->si_mtime); 707214921Scognet vap->va_mtime = dev->si_mtime; 708214921Scognet fix(dev->si_ctime); 709214921Scognet vap->va_ctime = dev->si_ctime; 710214921Scognet 711214921Scognet vap->va_rdev = cdev2priv(dev)->cdp_inode; 712214921Scognet } 713214921Scognet vap->va_gen = 0; 714214921Scognet vap->va_flags = 0; 715214921Scognet vap->va_filerev = 0; 716214921Scognet vap->va_nlink = de->de_links; 717214921Scognet vap->va_fileid = de->de_inode; 718214921Scognet 719214921Scognet return (error); 720214921Scognet} 721214921Scognet 722214921Scognet/* ARGSUSED */ 723214921Scognetstatic int 724214921Scognetdevfs_ioctl_f(struct file *fp, u_long com, void *data, struct ucred *cred, struct thread *td) 725214921Scognet{ 726214921Scognet struct cdev *dev; 727214921Scognet struct cdevsw *dsw; 728214921Scognet struct vnode *vp; 729214921Scognet struct vnode *vpold; 730214921Scognet int error, i, ref; 731214921Scognet const char *p; 732214921Scognet struct fiodgname_arg *fgn; 733214921Scognet struct file *fpop; 734214921Scognet 735214921Scognet fpop = td->td_fpop; 736214921Scognet error = devfs_fp_check(fp, &dev, &dsw, &ref); 737214921Scognet if (error != 0) { 738214921Scognet error = vnops.fo_ioctl(fp, com, data, cred, td); 739214921Scognet return (error); 740214921Scognet } 741214921Scognet 742214921Scognet if (com == FIODTYPE) { 743214921Scognet *(int *)data = dsw->d_flags & D_TYPEMASK; 744214921Scognet td->td_fpop = fpop; 745214921Scognet dev_relthread(dev, ref); 746214921Scognet return (0); 747214921Scognet } else if (com == FIODGNAME) { 748214921Scognet fgn = data; 749214921Scognet p = devtoname(dev); 750214921Scognet i = strlen(p) + 1; 751214921Scognet if (i > fgn->len) 752214921Scognet error = EINVAL; 753214921Scognet else 754214921Scognet error = copyout(p, fgn->buf, i); 755214921Scognet td->td_fpop = fpop; 756214921Scognet dev_relthread(dev, ref); 757214921Scognet return (error); 758214921Scognet } 759214921Scognet error = dsw->d_ioctl(dev, com, data, fp->f_flag, td); 760214921Scognet td->td_fpop = NULL; 761214921Scognet dev_relthread(dev, ref); 762214921Scognet if (error == ENOIOCTL) 763214921Scognet error = ENOTTY; 764214921Scognet if (error == 0 && com == TIOCSCTTY) { 765214921Scognet vp = fp->f_vnode; 766214921Scognet 767214921Scognet /* Do nothing if reassigning same control tty */ 768214921Scognet sx_slock(&proctree_lock); 769214921Scognet if (td->td_proc->p_session->s_ttyvp == vp) { 770214921Scognet sx_sunlock(&proctree_lock); 771214921Scognet return (0); 772214921Scognet } 773214921Scognet 774214921Scognet vpold = td->td_proc->p_session->s_ttyvp; 775214921Scognet VREF(vp); 776214921Scognet SESS_LOCK(td->td_proc->p_session); 777214921Scognet td->td_proc->p_session->s_ttyvp = vp; 778214921Scognet td->td_proc->p_session->s_ttydp = cdev2priv(dev); 779214921Scognet SESS_UNLOCK(td->td_proc->p_session); 780214921Scognet 781214921Scognet sx_sunlock(&proctree_lock); 782214921Scognet 783214921Scognet /* Get rid of reference to old control tty */ 784214921Scognet if (vpold) 785214921Scognet vrele(vpold); 786214921Scognet } 787214921Scognet return (error); 788214921Scognet} 789214921Scognet 790214921Scognet/* ARGSUSED */ 791214921Scognetstatic int 792214921Scognetdevfs_kqfilter_f(struct file *fp, struct knote *kn) 793214921Scognet{ 794214921Scognet struct cdev *dev; 795214921Scognet struct cdevsw *dsw; 796214921Scognet int error, ref; 797214921Scognet struct file *fpop; 798214921Scognet struct thread *td; 799214921Scognet 800214921Scognet td = curthread; 801214921Scognet fpop = td->td_fpop; 802214921Scognet error = devfs_fp_check(fp, &dev, &dsw, &ref); 803214921Scognet if (error) 804214921Scognet return (error); 805214921Scognet error = dsw->d_kqfilter(dev, kn); 806224762Smarius td->td_fpop = fpop; 807214921Scognet dev_relthread(dev, ref); 808214921Scognet return (error); 809214921Scognet} 810214921Scognet 811214921Scognetstatic inline int 812214921Scognetdevfs_prison_check(struct devfs_dirent *de, struct thread *td) 813214921Scognet{ 814214921Scognet struct cdev_priv *cdp; 815214921Scognet struct ucred *dcr; 816214921Scognet int error; 817214921Scognet 818214921Scognet cdp = de->de_cdp; 819214921Scognet if (cdp == NULL) 820214921Scognet return (0); 821214921Scognet dcr = cdp->cdp_c.si_cred; 822214921Scognet if (dcr == NULL) 823214921Scognet return (0); 824214921Scognet 825214921Scognet error = prison_check(td->td_ucred, dcr); 826214921Scognet if (error == 0) 827214921Scognet return (0); 828214921Scognet /* We do, however, allow access to the controlling terminal */ 829214921Scognet if (!(td->td_proc->p_flag & P_CONTROLT)) 830214921Scognet return (error); 831214921Scognet if (td->td_proc->p_session->s_ttydp == cdp) 832214921Scognet return (0); 833214921Scognet return (error); 834214921Scognet} 835214921Scognet 836214921Scognetstatic int 837214921Scognetdevfs_lookupx(struct vop_lookup_args *ap, int *dm_unlock) 838214921Scognet{ 839214921Scognet struct componentname *cnp; 840214921Scognet struct vnode *dvp, **vpp; 841214921Scognet struct thread *td; 842214921Scognet struct devfs_dirent *de, *dd; 843224762Smarius struct devfs_dirent **dde; 844214921Scognet struct devfs_mount *dmp; 845214921Scognet struct cdev *cdev; 846214921Scognet int error, flags, nameiop, dvplocked; 847214921Scognet char specname[SPECNAMELEN + 1], *pname; 848214921Scognet 849214921Scognet cnp = ap->a_cnp; 850214921Scognet vpp = ap->a_vpp; 851214921Scognet dvp = ap->a_dvp; 852214921Scognet pname = cnp->cn_nameptr; 853214921Scognet td = cnp->cn_thread; 854214921Scognet flags = cnp->cn_flags; 855214921Scognet nameiop = cnp->cn_nameiop; 856214921Scognet dmp = VFSTODEVFS(dvp->v_mount); 857214921Scognet dd = dvp->v_data; 858214921Scognet *vpp = NULLVP; 859214921Scognet 860214921Scognet if ((flags & ISLASTCN) && nameiop == RENAME) 861214921Scognet return (EOPNOTSUPP); 862214921Scognet 863214921Scognet if (dvp->v_type != VDIR) 864214921Scognet return (ENOTDIR); 865214921Scognet 866214921Scognet if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT)) 867214921Scognet return (EIO); 868214921Scognet 869214921Scognet error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td); 870214921Scognet if (error) 871214921Scognet return (error); 872224762Smarius 873214921Scognet if (cnp->cn_namelen == 1 && *pname == '.') { 874214921Scognet if ((flags & ISLASTCN) && nameiop != LOOKUP) 875214921Scognet return (EINVAL); 876214921Scognet *vpp = dvp; 877214921Scognet VREF(dvp); 878214921Scognet return (0); 879214921Scognet } 880214921Scognet 881214921Scognet if (flags & ISDOTDOT) { 882214921Scognet if ((flags & ISLASTCN) && nameiop != LOOKUP) 883214921Scognet return (EINVAL); 884214921Scognet de = devfs_parent_dirent(dd); 885214921Scognet if (de == NULL) 886214921Scognet return (ENOENT); 887214921Scognet dvplocked = VOP_ISLOCKED(dvp); 888214921Scognet VOP_UNLOCK(dvp, 0); 889214921Scognet error = devfs_allocv(de, dvp->v_mount, 890214921Scognet cnp->cn_lkflags & LK_TYPE_MASK, vpp); 891214921Scognet *dm_unlock = 0; 892214921Scognet vn_lock(dvp, dvplocked | LK_RETRY); 893214921Scognet return (error); 894214921Scognet } 895214921Scognet 896214921Scognet dd = dvp->v_data; 897214921Scognet de = devfs_find(dd, cnp->cn_nameptr, cnp->cn_namelen, 0); 898214921Scognet while (de == NULL) { /* While(...) so we can use break */ 899214921Scognet 900214921Scognet if (nameiop == DELETE) 901214921Scognet return (ENOENT); 902214921Scognet 903214921Scognet /* 904214921Scognet * OK, we didn't have an entry for the name we were asked for 905214921Scognet * so we try to see if anybody can create it on demand. 906214921Scognet */ 907214921Scognet pname = devfs_fqpn(specname, dmp, dd, cnp); 908214921Scognet if (pname == NULL) 909214921Scognet break; 910214921Scognet 911214921Scognet cdev = NULL; 912214921Scognet DEVFS_DMP_HOLD(dmp); 913214921Scognet sx_xunlock(&dmp->dm_lock); 914214921Scognet sx_slock(&clone_drain_lock); 915214921Scognet EVENTHANDLER_INVOKE(dev_clone, 916214921Scognet td->td_ucred, pname, strlen(pname), &cdev); 917214921Scognet sx_sunlock(&clone_drain_lock); 918214921Scognet 919214921Scognet if (cdev == NULL) 920214921Scognet sx_xlock(&dmp->dm_lock); 921214921Scognet else if (devfs_populate_vp(dvp) != 0) { 922214921Scognet *dm_unlock = 0; 923214921Scognet sx_xlock(&dmp->dm_lock); 924214921Scognet if (DEVFS_DMP_DROP(dmp)) { 925214921Scognet sx_xunlock(&dmp->dm_lock); 926214921Scognet devfs_unmount_final(dmp); 927214921Scognet } else 928214921Scognet sx_xunlock(&dmp->dm_lock); 929214921Scognet dev_rel(cdev); 930214921Scognet return (ENOENT); 931214921Scognet } 932214921Scognet if (DEVFS_DMP_DROP(dmp)) { 933214921Scognet *dm_unlock = 0; 934214921Scognet sx_xunlock(&dmp->dm_lock); 935214921Scognet devfs_unmount_final(dmp); 936214921Scognet if (cdev != NULL) 937214921Scognet dev_rel(cdev); 938214921Scognet return (ENOENT); 939214921Scognet } 940214921Scognet 941214921Scognet if (cdev == NULL) 942214921Scognet break; 943214921Scognet 944214921Scognet dev_lock(); 945214921Scognet dde = &cdev2priv(cdev)->cdp_dirents[dmp->dm_idx]; 946214921Scognet if (dde != NULL && *dde != NULL) 947214921Scognet de = *dde; 948214921Scognet dev_unlock(); 949214921Scognet dev_rel(cdev); 950214921Scognet break; 951214921Scognet } 952214921Scognet 953214921Scognet if (de == NULL || de->de_flags & DE_WHITEOUT) { 954214921Scognet if ((nameiop == CREATE || nameiop == RENAME) && 955214921Scognet (flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) { 956214921Scognet cnp->cn_flags |= SAVENAME; 957214921Scognet return (EJUSTRETURN); 958214921Scognet } 959214921Scognet return (ENOENT); 960214921Scognet } 961214921Scognet 962214921Scognet if (devfs_prison_check(de, td)) 963214921Scognet return (ENOENT); 964214921Scognet 965214921Scognet if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) { 966214921Scognet error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td); 967214921Scognet if (error) 968214921Scognet return (error); 969214921Scognet if (*vpp == dvp) { 970214921Scognet VREF(dvp); 971214921Scognet *vpp = dvp; 972214921Scognet return (0); 973214921Scognet } 974214921Scognet } 975214921Scognet error = devfs_allocv(de, dvp->v_mount, cnp->cn_lkflags & LK_TYPE_MASK, 976214921Scognet vpp); 977214921Scognet *dm_unlock = 0; 978214921Scognet return (error); 979214921Scognet} 980214921Scognet 981214921Scognetstatic int 982214921Scognetdevfs_lookup(struct vop_lookup_args *ap) 983214921Scognet{ 984214921Scognet int j; 985214921Scognet struct devfs_mount *dmp; 986214921Scognet int dm_unlock; 987214921Scognet 988214921Scognet if (devfs_populate_vp(ap->a_dvp) != 0) 989214921Scognet return (ENOTDIR); 990214921Scognet 991214921Scognet dmp = VFSTODEVFS(ap->a_dvp->v_mount); 992214921Scognet dm_unlock = 1; 993214921Scognet j = devfs_lookupx(ap, &dm_unlock); 994214921Scognet if (dm_unlock == 1) 995214921Scognet sx_xunlock(&dmp->dm_lock); 996214921Scognet return (j); 997214921Scognet} 998214921Scognet 999214921Scognetstatic int 1000214921Scognetdevfs_mknod(struct vop_mknod_args *ap) 1001214921Scognet{ 1002214921Scognet struct componentname *cnp; 1003214921Scognet struct vnode *dvp, **vpp; 1004214921Scognet struct devfs_dirent *dd, *de; 1005214921Scognet struct devfs_mount *dmp; 1006214921Scognet int error; 1007214921Scognet 1008214921Scognet /* 1009214921Scognet * The only type of node we should be creating here is a 1010214921Scognet * character device, for anything else return EOPNOTSUPP. 1011214921Scognet */ 1012214921Scognet if (ap->a_vap->va_type != VCHR) 1013214921Scognet return (EOPNOTSUPP); 1014214921Scognet dvp = ap->a_dvp; 1015214921Scognet dmp = VFSTODEVFS(dvp->v_mount); 1016214921Scognet 1017214921Scognet cnp = ap->a_cnp; 1018214921Scognet vpp = ap->a_vpp; 1019214921Scognet dd = dvp->v_data; 1020214921Scognet 1021214921Scognet error = ENOENT; 1022214921Scognet sx_xlock(&dmp->dm_lock); 1023214921Scognet TAILQ_FOREACH(de, &dd->de_dlist, de_list) { 1024214921Scognet if (cnp->cn_namelen != de->de_dirent->d_namlen) 1025214921Scognet continue; 1026214921Scognet if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, 1027214921Scognet de->de_dirent->d_namlen) != 0) 1028214921Scognet continue; 1029214921Scognet if (de->de_flags & DE_WHITEOUT) 1030214921Scognet break; 1031214921Scognet goto notfound; 1032214921Scognet } 1033214921Scognet if (de == NULL) 1034214921Scognet goto notfound; 1035214921Scognet de->de_flags &= ~DE_WHITEOUT; 1036214921Scognet error = devfs_allocv(de, dvp->v_mount, LK_EXCLUSIVE, vpp); 1037214921Scognet return (error); 1038214921Scognetnotfound: 1039214921Scognet sx_xunlock(&dmp->dm_lock); 1040214921Scognet return (error); 1041214921Scognet} 1042214921Scognet 1043214921Scognet/* ARGSUSED */ 1044214921Scognetstatic int 1045214921Scognetdevfs_open(struct vop_open_args *ap) 1046214921Scognet{ 1047214921Scognet struct thread *td = ap->a_td; 1048214921Scognet struct vnode *vp = ap->a_vp; 1049214921Scognet struct cdev *dev = vp->v_rdev; 1050230354Seadler struct file *fp = ap->a_fp; 1051214921Scognet int error, ref, vlocked; 1052214921Scognet struct cdevsw *dsw; 1053214921Scognet struct file *fpop; 1054214921Scognet struct mtx *mtxp; 1055214921Scognet 1056214921Scognet if (vp->v_type == VBLK) 1057214921Scognet return (ENXIO); 1058290595Sngie 1059214921Scognet if (dev == NULL) 1060214921Scognet return (ENXIO); 1061214921Scognet 1062214921Scognet /* Make this field valid before any I/O in d_open. */ 1063214921Scognet if (dev->si_iosize_max == 0) 1064214921Scognet dev->si_iosize_max = DFLTPHYS; 1065214921Scognet 1066214921Scognet dsw = dev_refthread(dev, &ref); 1067214921Scognet if (dsw == NULL) 1068214921Scognet return (ENXIO); 1069316198Ssevan if (fp == NULL && dsw->d_fdopen != NULL) { 1070214921Scognet dev_relthread(dev, ref); 1071214921Scognet return (ENXIO); 1072214921Scognet } 1073214921Scognet 1074214921Scognet vlocked = VOP_ISLOCKED(vp); 1075214921Scognet VOP_UNLOCK(vp, 0); 1076214921Scognet 1077214921Scognet fpop = td->td_fpop; 1078214921Scognet td->td_fpop = fp; 1079214921Scognet if (fp != NULL) { 1080214921Scognet fp->f_data = dev; 1081214921Scognet fp->f_vnode = vp; 1082214921Scognet } 1083214921Scognet if (dsw->d_fdopen != NULL) 1084214921Scognet error = dsw->d_fdopen(dev, ap->a_mode, td, fp); 1085214921Scognet else 1086214921Scognet error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td); 1087214921Scognet /* cleanup any cdevpriv upon error */ 1088230529Shrs if (error != 0) 1089230529Shrs devfs_clear_cdevpriv(); 1090214921Scognet td->td_fpop = fpop; 1091214921Scognet 1092214921Scognet vn_lock(vp, vlocked | LK_RETRY); 1093214921Scognet dev_relthread(dev, ref); 1094214921Scognet if (error != 0) { 1095214921Scognet if (error == ERESTART) 1096214921Scognet error = EINTR; 1097214921Scognet return (error); 1098214921Scognet } 1099214921Scognet 1100214921Scognet#if 0 /* /dev/console */ 1101214921Scognet KASSERT(fp != NULL, ("Could not vnode bypass device on NULL fp")); 1102214921Scognet#else 1103214921Scognet if (fp == NULL) 1104214921Scognet return (error); 1105214921Scognet#endif 1106214921Scognet if (fp->f_ops == &badfileops) 1107214921Scognet finit(fp, fp->f_flag, DTYPE_VNODE, dev, &devfs_ops_f); 1108214921Scognet mtxp = mtx_pool_find(mtxpool_sleep, fp); 1109214921Scognet 1110214921Scognet /* 1111214921Scognet * Hint to the dofilewrite() to not force the buffer draining 1112214921Scognet * on the writer to the file. Most likely, the write would 1113214921Scognet * not need normal buffers. 1114214921Scognet */ 1115214921Scognet mtx_lock(mtxp); 1116214921Scognet fp->f_vnread_flags |= FDEVFS_VNODE; 1117214921Scognet mtx_unlock(mtxp); 1118214921Scognet return (error); 1119214921Scognet} 1120214921Scognet 1121214921Scognetstatic int 1122214921Scognetdevfs_pathconf(struct vop_pathconf_args *ap) 1123214921Scognet{ 1124214921Scognet 1125214921Scognet switch (ap->a_name) { 1126214921Scognet case _PC_MAC_PRESENT: 1127214921Scognet#ifdef MAC 1128214921Scognet /* 1129214921Scognet * If MAC is enabled, devfs automatically supports 1130214921Scognet * trivial non-persistant label storage. 1131214921Scognet */ 1132214921Scognet *ap->a_retval = 1; 1133214921Scognet#else 1134214921Scognet *ap->a_retval = 0; 1135214921Scognet#endif 1136214921Scognet return (0); 1137214921Scognet default: 1138214921Scognet return (vop_stdpathconf(ap)); 1139214921Scognet } 1140214921Scognet /* NOTREACHED */ 1141214921Scognet} 1142214921Scognet 1143214921Scognet/* ARGSUSED */ 1144214921Scognetstatic int 1145214921Scognetdevfs_poll_f(struct file *fp, int events, struct ucred *cred, struct thread *td) 1146214921Scognet{ 1147214921Scognet struct cdev *dev; 1148214921Scognet struct cdevsw *dsw; 1149214921Scognet int error, ref; 1150214921Scognet struct file *fpop; 1151214921Scognet 1152214921Scognet fpop = td->td_fpop; 1153214921Scognet error = devfs_fp_check(fp, &dev, &dsw, &ref); 1154214921Scognet if (error != 0) { 1155214921Scognet error = vnops.fo_poll(fp, events, cred, td); 1156214921Scognet return (error); 1157214921Scognet } 1158214921Scognet error = dsw->d_poll(dev, events, td); 1159214921Scognet td->td_fpop = fpop; 1160214921Scognet dev_relthread(dev, ref); 1161214921Scognet return(error); 1162214921Scognet} 1163214921Scognet 1164214921Scognet/* 1165214921Scognet * Print out the contents of a special device vnode. 1166214921Scognet */ 1167214921Scognetstatic int 1168214921Scognetdevfs_print(struct vop_print_args *ap) 1169214921Scognet{ 1170214921Scognet 1171214921Scognet printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev)); 1172214921Scognet return (0); 1173214921Scognet} 1174214921Scognet 1175214921Scognetstatic int 1176214921Scognetdevfs_read_f(struct file *fp, struct uio *uio, struct ucred *cred, 1177214921Scognet int flags, struct thread *td) 1178214921Scognet{ 1179214921Scognet struct cdev *dev; 1180214921Scognet int ioflag, error, ref; 1181214921Scognet ssize_t resid; 1182214921Scognet struct cdevsw *dsw; 1183214921Scognet struct file *fpop; 1184214921Scognet 1185214921Scognet if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1186214921Scognet return (EINVAL); 1187214921Scognet fpop = td->td_fpop; 1188214921Scognet error = devfs_fp_check(fp, &dev, &dsw, &ref); 1189214921Scognet if (error != 0) { 1190214921Scognet error = vnops.fo_read(fp, uio, cred, flags, td); 1191214921Scognet return (error); 1192214921Scognet } 1193214921Scognet resid = uio->uio_resid; 1194214921Scognet ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT); 1195214921Scognet if (ioflag & O_DIRECT) 1196214921Scognet ioflag |= IO_DIRECT; 1197214921Scognet 1198214921Scognet foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1199214921Scognet error = dsw->d_read(dev, uio, ioflag); 1200214921Scognet if (uio->uio_resid != resid || (error == 0 && resid != 0)) 1201214921Scognet vfs_timestamp(&dev->si_atime); 1202214921Scognet td->td_fpop = fpop; 1203214921Scognet dev_relthread(dev, ref); 1204214921Scognet 1205214921Scognet foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); 1206214921Scognet return (error); 1207214921Scognet} 1208214921Scognet 1209214921Scognetstatic int 1210214921Scognetdevfs_readdir(struct vop_readdir_args *ap) 1211214921Scognet{ 1212214921Scognet int error; 1213214921Scognet struct uio *uio; 1214214921Scognet struct dirent *dp; 1215214921Scognet struct devfs_dirent *dd; 1216214921Scognet struct devfs_dirent *de; 1217214921Scognet struct devfs_mount *dmp; 1218214921Scognet off_t off; 1219214921Scognet int *tmp_ncookies = NULL; 1220214921Scognet 1221214921Scognet if (ap->a_vp->v_type != VDIR) 1222214921Scognet return (ENOTDIR); 1223214921Scognet 1224214921Scognet uio = ap->a_uio; 1225214921Scognet if (uio->uio_offset < 0) 1226214921Scognet return (EINVAL); 1227214921Scognet 1228214921Scognet /* 1229214921Scognet * XXX: This is a temporary hack to get around this filesystem not 1230214921Scognet * supporting cookies. We store the location of the ncookies pointer 1231214921Scognet * in a temporary variable before calling vfs_subr.c:vfs_read_dirent() 1232214921Scognet * and set the number of cookies to 0. We then set the pointer to 1233214921Scognet * NULL so that vfs_read_dirent doesn't try to call realloc() on 1234214921Scognet * ap->a_cookies. Later in this function, we restore the ap->a_ncookies 1235214921Scognet * pointer to its original location before returning to the caller. 1236214921Scognet */ 1237214921Scognet if (ap->a_ncookies != NULL) { 1238214921Scognet tmp_ncookies = ap->a_ncookies; 1239214921Scognet *ap->a_ncookies = 0; 1240214921Scognet ap->a_ncookies = NULL; 1241214921Scognet } 1242214921Scognet 1243214921Scognet dmp = VFSTODEVFS(ap->a_vp->v_mount); 1244214921Scognet if (devfs_populate_vp(ap->a_vp) != 0) { 1245214921Scognet if (tmp_ncookies != NULL) 1246214921Scognet ap->a_ncookies = tmp_ncookies; 1247214921Scognet return (EIO); 1248214921Scognet } 1249214921Scognet error = 0; 1250214921Scognet de = ap->a_vp->v_data; 1251214921Scognet off = 0; 1252214921Scognet TAILQ_FOREACH(dd, &de->de_dlist, de_list) { 1253214921Scognet KASSERT(dd->de_cdp != (void *)0xdeadc0de, ("%s %d\n", __func__, __LINE__)); 1254214921Scognet if (dd->de_flags & (DE_COVERED | DE_WHITEOUT)) 1255214921Scognet continue; 1256214921Scognet if (devfs_prison_check(dd, uio->uio_td)) 1257214921Scognet continue; 1258214921Scognet if (dd->de_dirent->d_type == DT_DIR) 1259214921Scognet de = dd->de_dir; 1260214921Scognet else 1261214921Scognet de = dd; 1262214921Scognet dp = dd->de_dirent; 1263214921Scognet if (dp->d_reclen > uio->uio_resid) 1264214921Scognet break; 1265214921Scognet dp->d_fileno = de->de_inode; 1266214921Scognet if (off >= uio->uio_offset) { 1267214921Scognet error = vfs_read_dirent(ap, dp, off); 1268214921Scognet if (error) 1269214921Scognet break; 1270214921Scognet } 1271214921Scognet off += dp->d_reclen; 1272214921Scognet } 1273214921Scognet sx_xunlock(&dmp->dm_lock); 1274214921Scognet uio->uio_offset = off; 1275214921Scognet 1276214921Scognet /* 1277214921Scognet * Restore ap->a_ncookies if it wasn't originally NULL in the first 1278214921Scognet * place. 1279214921Scognet */ 1280214921Scognet if (tmp_ncookies != NULL) 1281214921Scognet ap->a_ncookies = tmp_ncookies; 1282214921Scognet 1283214921Scognet return (error); 1284214921Scognet} 1285214921Scognet 1286214921Scognetstatic int 1287214921Scognetdevfs_readlink(struct vop_readlink_args *ap) 1288214921Scognet{ 1289214921Scognet struct devfs_dirent *de; 1290214921Scognet 1291214921Scognet de = ap->a_vp->v_data; 1292214921Scognet return (uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio)); 1293214921Scognet} 1294214921Scognet 1295214921Scognetstatic int 1296214921Scognetdevfs_reclaim(struct vop_reclaim_args *ap) 1297224690Smm{ 1298224690Smm struct vnode *vp = ap->a_vp; 1299214921Scognet struct devfs_dirent *de; 1300214921Scognet struct cdev *dev; 1301214921Scognet 1302214921Scognet mtx_lock(&devfs_de_interlock); 1303214921Scognet de = vp->v_data; 1304214921Scognet if (de != NULL) { 1305214921Scognet de->de_vnode = NULL; 1306214921Scognet vp->v_data = NULL; 1307214921Scognet } 1308214921Scognet mtx_unlock(&devfs_de_interlock); 1309214921Scognet 1310214921Scognet vnode_destroy_vobject(vp); 1311214921Scognet 1312214921Scognet VI_LOCK(vp); 1313214921Scognet dev_lock(); 1314214921Scognet dev = vp->v_rdev; 1315214921Scognet vp->v_rdev = NULL; 1316214921Scognet 1317214921Scognet if (dev == NULL) { 1318214921Scognet dev_unlock(); 1319214921Scognet VI_UNLOCK(vp); 1320214921Scognet return (0); 1321214921Scognet } 1322214921Scognet 1323214921Scognet dev->si_usecount -= vp->v_usecount; 1324214921Scognet dev_unlock(); 1325214921Scognet VI_UNLOCK(vp); 1326214921Scognet dev_rel(dev); 1327214921Scognet return (0); 1328214921Scognet} 1329214921Scognet 1330214921Scognetstatic int 1331214921Scognetdevfs_remove(struct vop_remove_args *ap) 1332214921Scognet{ 1333214921Scognet struct vnode *dvp = ap->a_dvp; 1334214921Scognet struct vnode *vp = ap->a_vp; 1335214921Scognet struct devfs_dirent *dd; 1336214921Scognet struct devfs_dirent *de, *de_covered; 1337214921Scognet struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount); 1338214921Scognet 1339214921Scognet ASSERT_VOP_ELOCKED(dvp, "devfs_remove"); 1340214921Scognet ASSERT_VOP_ELOCKED(vp, "devfs_remove"); 1341214921Scognet 1342214921Scognet sx_xlock(&dmp->dm_lock); 1343214921Scognet dd = ap->a_dvp->v_data; 1344214921Scognet de = vp->v_data; 1345214921Scognet if (de->de_cdp == NULL) { 1346214921Scognet TAILQ_REMOVE(&dd->de_dlist, de, de_list); 1347214921Scognet if (de->de_dirent->d_type == DT_LNK) { 1348214921Scognet de_covered = devfs_find(dd, de->de_dirent->d_name, 1349214921Scognet de->de_dirent->d_namlen, 0); 1350214921Scognet if (de_covered != NULL) 1351214921Scognet de_covered->de_flags &= ~DE_COVERED; 1352214921Scognet } 1353214921Scognet /* We need to unlock dvp because devfs_delete() may lock it. */ 1354214921Scognet VOP_UNLOCK(vp, 0); 1355214921Scognet if (dvp != vp) 1356214921Scognet VOP_UNLOCK(dvp, 0); 1357214921Scognet devfs_delete(dmp, de, 0); 1358214921Scognet sx_xunlock(&dmp->dm_lock); 1359214921Scognet if (dvp != vp) 1360214921Scognet vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1361214921Scognet vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1362214921Scognet } else { 1363214921Scognet de->de_flags |= DE_WHITEOUT; 1364214921Scognet sx_xunlock(&dmp->dm_lock); 1365214921Scognet } 1366214921Scognet return (0); 1367214921Scognet} 1368214921Scognet 1369214921Scognet/* 1370214921Scognet * Revoke is called on a tty when a terminal session ends. The vnode 1371214921Scognet * is orphaned by setting v_op to deadfs so we need to let go of it 1372214921Scognet * as well so that we create a new one next time around. 1373214921Scognet * 1374214921Scognet */ 1375214921Scognetstatic int 1376214921Scognetdevfs_revoke(struct vop_revoke_args *ap) 1377214921Scognet{ 1378214921Scognet struct vnode *vp = ap->a_vp, *vp2; 1379214921Scognet struct cdev *dev; 1380214921Scognet struct cdev_priv *cdp; 1381214921Scognet struct devfs_dirent *de; 1382214921Scognet int i; 1383214921Scognet 1384214921Scognet KASSERT((ap->a_flags & REVOKEALL) != 0, ("devfs_revoke !REVOKEALL")); 1385214921Scognet 1386214921Scognet dev = vp->v_rdev; 1387214921Scognet cdp = cdev2priv(dev); 1388214921Scognet 1389214921Scognet dev_lock(); 1390214921Scognet cdp->cdp_inuse++; 1391214921Scognet dev_unlock(); 1392214921Scognet 1393214921Scognet vhold(vp); 1394214921Scognet vgone(vp); 1395214921Scognet vdrop(vp); 1396214921Scognet 1397214921Scognet VOP_UNLOCK(vp,0); 1398214921Scognet loop: 1399214921Scognet for (;;) { 1400214921Scognet mtx_lock(&devfs_de_interlock); 1401214921Scognet dev_lock(); 1402214921Scognet vp2 = NULL; 1403214921Scognet for (i = 0; i <= cdp->cdp_maxdirent; i++) { 1404214921Scognet de = cdp->cdp_dirents[i]; 1405214921Scognet if (de == NULL) 1406214921Scognet continue; 1407214921Scognet 1408214921Scognet vp2 = de->de_vnode; 1409214921Scognet if (vp2 != NULL) { 1410214921Scognet dev_unlock(); 1411214921Scognet VI_LOCK(vp2); 1412214921Scognet mtx_unlock(&devfs_de_interlock); 1413214921Scognet if (vget(vp2, LK_EXCLUSIVE | LK_INTERLOCK, 1414214921Scognet curthread)) 1415214921Scognet goto loop; 1416214921Scognet vhold(vp2); 1417214921Scognet vgone(vp2); 1418214921Scognet vdrop(vp2); 1419214921Scognet vput(vp2); 1420214921Scognet break; 1421214921Scognet } 1422214921Scognet } 1423214921Scognet if (vp2 != NULL) { 1424214921Scognet continue; 1425214921Scognet } 1426214921Scognet dev_unlock(); 1427214921Scognet mtx_unlock(&devfs_de_interlock); 1428214921Scognet break; 1429214921Scognet } 1430214921Scognet dev_lock(); 1431214921Scognet cdp->cdp_inuse--; 1432214921Scognet if (!(cdp->cdp_flags & CDP_ACTIVE) && cdp->cdp_inuse == 0) { 1433214921Scognet TAILQ_REMOVE(&cdevp_list, cdp, cdp_list); 1434214921Scognet dev_unlock(); 1435214921Scognet dev_rel(&cdp->cdp_c); 1436214921Scognet } else 1437214921Scognet dev_unlock(); 1438214921Scognet 1439214921Scognet vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1440214921Scognet return (0); 1441214921Scognet} 1442214921Scognet 1443214921Scognetstatic int 1444214921Scognetdevfs_rioctl(struct vop_ioctl_args *ap) 1445214921Scognet{ 1446214921Scognet struct vnode *vp; 1447214921Scognet struct devfs_mount *dmp; 1448214921Scognet int error; 1449214921Scognet 1450214921Scognet vp = ap->a_vp; 1451214921Scognet vn_lock(vp, LK_SHARED | LK_RETRY); 1452214921Scognet if (vp->v_iflag & VI_DOOMED) { 1453214921Scognet VOP_UNLOCK(vp, 0); 1454214921Scognet return (EBADF); 1455214921Scognet } 1456214921Scognet dmp = VFSTODEVFS(vp->v_mount); 1457214921Scognet sx_xlock(&dmp->dm_lock); 1458214921Scognet VOP_UNLOCK(vp, 0); 1459214921Scognet DEVFS_DMP_HOLD(dmp); 1460214921Scognet devfs_populate(dmp); 1461214921Scognet if (DEVFS_DMP_DROP(dmp)) { 1462214921Scognet sx_xunlock(&dmp->dm_lock); 1463214921Scognet devfs_unmount_final(dmp); 1464214921Scognet return (ENOENT); 1465214921Scognet } 1466214921Scognet error = devfs_rules_ioctl(dmp, ap->a_command, ap->a_data, ap->a_td); 1467214921Scognet sx_xunlock(&dmp->dm_lock); 1468214921Scognet return (error); 1469214921Scognet} 1470214921Scognet 1471214921Scognetstatic int 1472214921Scognetdevfs_rread(struct vop_read_args *ap) 1473214921Scognet{ 1474214921Scognet 1475214921Scognet if (ap->a_vp->v_type != VDIR) 1476214921Scognet return (EINVAL); 1477214921Scognet return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL)); 1478214921Scognet} 1479214921Scognet 1480214921Scognetstatic int 1481214921Scognetdevfs_setattr(struct vop_setattr_args *ap) 1482214921Scognet{ 1483214921Scognet struct devfs_dirent *de; 1484214921Scognet struct vattr *vap; 1485214921Scognet struct vnode *vp; 1486214921Scognet struct thread *td; 1487214921Scognet int c, error; 1488214921Scognet uid_t uid; 1489214921Scognet gid_t gid; 1490214921Scognet 1491214921Scognet vap = ap->a_vap; 1492214921Scognet vp = ap->a_vp; 1493214921Scognet td = curthread; 1494214921Scognet if ((vap->va_type != VNON) || 1495214921Scognet (vap->va_nlink != VNOVAL) || 1496214921Scognet (vap->va_fsid != VNOVAL) || 1497214921Scognet (vap->va_fileid != VNOVAL) || 1498214921Scognet (vap->va_blocksize != VNOVAL) || 1499214921Scognet (vap->va_flags != VNOVAL && vap->va_flags != 0) || 1500214921Scognet (vap->va_rdev != VNOVAL) || 1501214921Scognet ((int)vap->va_bytes != VNOVAL) || 1502214921Scognet (vap->va_gen != VNOVAL)) { 1503214921Scognet return (EINVAL); 1504214921Scognet } 1505214921Scognet 1506214921Scognet de = vp->v_data; 1507214921Scognet if (vp->v_type == VDIR) 1508214921Scognet de = de->de_dir; 1509214921Scognet 1510214921Scognet error = c = 0; 1511214921Scognet if (vap->va_uid == (uid_t)VNOVAL) 1512214921Scognet uid = de->de_uid; 1513214921Scognet else 1514214921Scognet uid = vap->va_uid; 1515214921Scognet if (vap->va_gid == (gid_t)VNOVAL) 1516214921Scognet gid = de->de_gid; 1517214921Scognet else 1518214921Scognet gid = vap->va_gid; 1519214921Scognet if (uid != de->de_uid || gid != de->de_gid) { 1520214921Scognet if ((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid || 1521214921Scognet (gid != de->de_gid && !groupmember(gid, ap->a_cred))) { 1522214921Scognet error = priv_check(td, PRIV_VFS_CHOWN); 1523214921Scognet if (error) 1524214921Scognet return (error); 1525214921Scognet } 1526214921Scognet de->de_uid = uid; 1527214921Scognet de->de_gid = gid; 1528214921Scognet c = 1; 1529214921Scognet } 1530214921Scognet 1531214921Scognet if (vap->va_mode != (mode_t)VNOVAL) { 1532214921Scognet if (ap->a_cred->cr_uid != de->de_uid) { 1533214921Scognet error = priv_check(td, PRIV_VFS_ADMIN); 1534214921Scognet if (error) 1535214921Scognet return (error); 1536214921Scognet } 1537214921Scognet de->de_mode = vap->va_mode; 1538214921Scognet c = 1; 1539214921Scognet } 1540214921Scognet 1541214921Scognet if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { 1542214921Scognet error = vn_utimes_perm(vp, vap, ap->a_cred, td); 1543214921Scognet if (error != 0) 1544214921Scognet return (error); 1545214921Scognet if (vap->va_atime.tv_sec != VNOVAL) { 1546214921Scognet if (vp->v_type == VCHR) 1547214921Scognet vp->v_rdev->si_atime = vap->va_atime; 1548214921Scognet else 1549214921Scognet de->de_atime = vap->va_atime; 1550214921Scognet } 1551214921Scognet if (vap->va_mtime.tv_sec != VNOVAL) { 1552214921Scognet if (vp->v_type == VCHR) 1553214921Scognet vp->v_rdev->si_mtime = vap->va_mtime; 1554214921Scognet else 1555214921Scognet de->de_mtime = vap->va_mtime; 1556214921Scognet } 1557214921Scognet c = 1; 1558214921Scognet } 1559214921Scognet 1560214921Scognet if (c) { 1561214921Scognet if (vp->v_type == VCHR) 1562214921Scognet vfs_timestamp(&vp->v_rdev->si_ctime); 1563214921Scognet else 1564214921Scognet vfs_timestamp(&de->de_mtime); 1565214921Scognet } 1566214921Scognet return (0); 1567214921Scognet} 1568214921Scognet 1569214921Scognet#ifdef MAC 1570230795Sjkimstatic int 1571214921Scognetdevfs_setlabel(struct vop_setlabel_args *ap) 1572230795Sjkim{ 1573214921Scognet struct vnode *vp; 1574230795Sjkim struct devfs_dirent *de; 1575230795Sjkim 1576230795Sjkim vp = ap->a_vp; 1577230795Sjkim de = vp->v_data; 1578230795Sjkim 1579214921Scognet mac_vnode_relabel(ap->a_cred, vp, ap->a_label); 1580214921Scognet mac_devfs_update(vp->v_mount, de, vp); 1581214921Scognet 1582214921Scognet return (0); 1583214921Scognet} 1584214921Scognet#endif 1585214921Scognet 1586214921Scognetstatic int 1587214921Scognetdevfs_stat_f(struct file *fp, struct stat *sb, struct ucred *cred, struct thread *td) 1588214921Scognet{ 1589214921Scognet 1590214921Scognet return (vnops.fo_stat(fp, sb, cred, td)); 1591214921Scognet} 1592214921Scognet 1593214921Scognetstatic int 1594214921Scognetdevfs_symlink(struct vop_symlink_args *ap) 1595214921Scognet{ 1596214921Scognet int i, error; 1597214921Scognet struct devfs_dirent *dd; 1598214921Scognet struct devfs_dirent *de, *de_covered, *de_dotdot; 1599214921Scognet struct devfs_mount *dmp; 1600214921Scognet 1601214921Scognet error = priv_check(curthread, PRIV_DEVFS_SYMLINK); 1602214921Scognet if (error) 1603214921Scognet return(error); 1604225121Smm dmp = VFSTODEVFS(ap->a_dvp->v_mount); 1605214921Scognet if (devfs_populate_vp(ap->a_dvp) != 0) 1606214921Scognet return (ENOENT); 1607214921Scognet 1608214921Scognet dd = ap->a_dvp->v_data; 1609214921Scognet de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen); 1610214921Scognet de->de_flags = DE_USER; 1611214921Scognet de->de_uid = 0; 1612214921Scognet de->de_gid = 0; 1613214921Scognet de->de_mode = 0755; 1614214921Scognet de->de_inode = alloc_unr(devfs_inos); 1615214921Scognet de->de_dir = dd; 1616214921Scognet de->de_dirent->d_type = DT_LNK; 1617214921Scognet i = strlen(ap->a_target) + 1; 1618214921Scognet de->de_symlink = malloc(i, M_DEVFS, M_WAITOK); 1619214921Scognet bcopy(ap->a_target, de->de_symlink, i); 1620214921Scognet#ifdef MAC 1621225121Smm mac_devfs_create_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de); 1622214921Scognet#endif 1623214921Scognet de_covered = devfs_find(dd, de->de_dirent->d_name, 1624214921Scognet de->de_dirent->d_namlen, 0); 1625214921Scognet if (de_covered != NULL) { 1626214921Scognet if ((de_covered->de_flags & DE_USER) != 0) { 1627214921Scognet devfs_delete(dmp, de, DEVFS_DEL_NORECURSE); 1628214921Scognet sx_xunlock(&dmp->dm_lock); 1629214921Scognet return (EEXIST); 1630214921Scognet } 1631214921Scognet KASSERT((de_covered->de_flags & DE_COVERED) == 0, 1632214921Scognet ("devfs_symlink: entry %p already covered", de_covered)); 1633214921Scognet de_covered->de_flags |= DE_COVERED; 1634214921Scognet } 1635214921Scognet 1636214921Scognet de_dotdot = TAILQ_FIRST(&dd->de_dlist); /* "." */ 1637214921Scognet de_dotdot = TAILQ_NEXT(de_dotdot, de_list); /* ".." */ 1638214921Scognet TAILQ_INSERT_AFTER(&dd->de_dlist, de_dotdot, de, de_list); 1639214921Scognet devfs_dir_ref_de(dmp, dd); 1640214921Scognet devfs_rules_apply(dmp, de); 1641214921Scognet 1642214921Scognet return (devfs_allocv(de, ap->a_dvp->v_mount, LK_EXCLUSIVE, ap->a_vpp)); 1643214921Scognet} 1644214921Scognet 1645214921Scognetstatic int 1646214921Scognetdevfs_truncate_f(struct file *fp, off_t length, struct ucred *cred, struct thread *td) 1647214921Scognet{ 1648214921Scognet 1649214921Scognet return (vnops.fo_truncate(fp, length, cred, td)); 1650214921Scognet} 1651214921Scognet 1652214921Scognetstatic int 1653214921Scognetdevfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, 1654214921Scognet int flags, struct thread *td) 1655214921Scognet{ 1656214921Scognet struct cdev *dev; 1657214921Scognet int error, ioflag, ref; 1658214921Scognet ssize_t resid; 1659214921Scognet struct cdevsw *dsw; 1660214921Scognet struct file *fpop; 1661214921Scognet 1662214921Scognet if (uio->uio_resid > DEVFS_IOSIZE_MAX) 1663214921Scognet return (EINVAL); 1664214921Scognet fpop = td->td_fpop; 1665225121Smm error = devfs_fp_check(fp, &dev, &dsw, &ref); 1666214921Scognet if (error != 0) { 1667214921Scognet error = vnops.fo_write(fp, uio, cred, flags, td); 1668214921Scognet return (error); 1669214921Scognet } 1670214921Scognet KASSERT(uio->uio_td == td, ("uio_td %p is not td %p", uio->uio_td, td)); 1671214921Scognet ioflag = fp->f_flag & (O_NONBLOCK | O_DIRECT | O_FSYNC); 1672214921Scognet if (ioflag & O_DIRECT) 1673214921Scognet ioflag |= IO_DIRECT; 1674214921Scognet foffset_lock_uio(fp, uio, flags | FOF_NOLOCK); 1675214921Scognet 1676214921Scognet resid = uio->uio_resid; 1677214921Scognet 1678214921Scognet error = dsw->d_write(dev, uio, ioflag); 1679214921Scognet if (uio->uio_resid != resid || (error == 0 && resid != 0)) { 1680214921Scognet vfs_timestamp(&dev->si_ctime); 1681214921Scognet dev->si_mtime = dev->si_ctime; 1682214921Scognet } 1683214921Scognet td->td_fpop = fpop; 1684214921Scognet dev_relthread(dev, ref); 1685214921Scognet 1686214921Scognet foffset_unlock_uio(fp, uio, flags | FOF_NOLOCK | FOF_NEXTOFF); 1687214921Scognet return (error); 1688214921Scognet} 1689214921Scognet 1690214921Scognetdev_t 1691214921Scognetdev2udev(struct cdev *x) 1692214921Scognet{ 1693214921Scognet if (x == NULL) 1694214921Scognet return (NODEV); 1695214921Scognet return (cdev2priv(x)->cdp_inode); 1696214921Scognet} 1697214921Scognet 1698214921Scognetstatic struct fileops devfs_ops_f = { 1699214921Scognet .fo_read = devfs_read_f, 1700214921Scognet .fo_write = devfs_write_f, 1701214921Scognet .fo_truncate = devfs_truncate_f, 1702214921Scognet .fo_ioctl = devfs_ioctl_f, 1703214921Scognet .fo_poll = devfs_poll_f, 1704214921Scognet .fo_kqfilter = devfs_kqfilter_f, 1705214921Scognet .fo_stat = devfs_stat_f, 1706214921Scognet .fo_close = devfs_close_f, 1707214921Scognet .fo_chmod = vn_chmod, 1708214921Scognet .fo_chown = vn_chown, 1709214921Scognet .fo_sendfile = vn_sendfile, 1710214921Scognet .fo_seek = vn_seek, 1711214921Scognet .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE 1712214921Scognet}; 1713214921Scognet 1714214921Scognetstatic struct vop_vector devfs_vnodeops = { 1715214921Scognet .vop_default = &default_vnodeops, 1716214921Scognet 1717214921Scognet .vop_access = devfs_access, 1718214921Scognet .vop_getattr = devfs_getattr, 1719214921Scognet .vop_ioctl = devfs_rioctl, 1720214921Scognet .vop_lookup = devfs_lookup, 1721214921Scognet .vop_mknod = devfs_mknod, 1722214921Scognet .vop_pathconf = devfs_pathconf, 1723214921Scognet .vop_read = devfs_rread, 1724214921Scognet .vop_readdir = devfs_readdir, 1725214921Scognet .vop_readlink = devfs_readlink, 1726214921Scognet .vop_reclaim = devfs_reclaim, 1727214921Scognet .vop_remove = devfs_remove, 1728214921Scognet .vop_revoke = devfs_revoke, 1729214921Scognet .vop_setattr = devfs_setattr, 1730214921Scognet#ifdef MAC 1731214921Scognet .vop_setlabel = devfs_setlabel, 1732214921Scognet#endif 1733214921Scognet .vop_symlink = devfs_symlink, 1734290595Sngie .vop_vptocnp = devfs_vptocnp, 1735214921Scognet}; 1736214921Scognet 1737214921Scognetstatic struct vop_vector devfs_specops = { 1738214921Scognet .vop_default = &default_vnodeops, 1739214921Scognet 1740214921Scognet .vop_access = devfs_access, 1741214921Scognet .vop_bmap = VOP_PANIC, 1742214921Scognet .vop_close = devfs_close, 1743214921Scognet .vop_create = VOP_PANIC, 1744214921Scognet .vop_fsync = devfs_fsync, 1745214921Scognet .vop_getattr = devfs_getattr, 1746214921Scognet .vop_link = VOP_PANIC, 1747214921Scognet .vop_mkdir = VOP_PANIC, 1748214921Scognet .vop_mknod = VOP_PANIC, 1749214921Scognet .vop_open = devfs_open, 1750214921Scognet .vop_pathconf = devfs_pathconf, 1751214921Scognet .vop_poll = dead_poll, 1752214921Scognet .vop_print = devfs_print, 1753214921Scognet .vop_read = dead_read, 1754214921Scognet .vop_readdir = VOP_PANIC, 1755214921Scognet .vop_readlink = VOP_PANIC, 1756214921Scognet .vop_reallocblks = VOP_PANIC, 1757214921Scognet .vop_reclaim = devfs_reclaim, 1758214921Scognet .vop_remove = devfs_remove, 1759214921Scognet .vop_rename = VOP_PANIC, 1760214921Scognet .vop_revoke = devfs_revoke, 1761214921Scognet .vop_rmdir = VOP_PANIC, 1762214921Scognet .vop_setattr = devfs_setattr, 1763214921Scognet#ifdef MAC 1764214921Scognet .vop_setlabel = devfs_setlabel, 1765214921Scognet#endif 1766214921Scognet .vop_strategy = VOP_PANIC, 1767214921Scognet .vop_symlink = VOP_PANIC, 1768214921Scognet .vop_vptocnp = devfs_vptocnp, 1769214921Scognet .vop_write = dead_write, 1770214921Scognet}; 1771214921Scognet 1772214921Scognet/* 1773214921Scognet * Our calling convention to the device drivers used to be that we passed 1774214921Scognet * vnode.h IO_* flags to read()/write(), but we're moving to fcntl.h O_ 1775214921Scognet * flags instead since that's what open(), close() and ioctl() takes and 1776214921Scognet * we don't really want vnode.h in device drivers. 1777214921Scognet * We solved the source compatibility by redefining some vnode flags to 1778214921Scognet * be the same as the fcntl ones and by sending down the bitwise OR of 1779214921Scognet * the respective fcntl/vnode flags. These CTASSERTS make sure nobody 1780214921Scognet * pulls the rug out under this. 1781214921Scognet */ 1782214921ScognetCTASSERT(O_NONBLOCK == IO_NDELAY); 1783214921ScognetCTASSERT(O_FSYNC == IO_SYNC); 1784214921Scognet