/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * University Copyright- Copyright (c) 1982, 1986, 1988 * The Regents of the University of California * All Rights Reserved * * University Acknowledgment- Portions of this document are derived from * software developed by the University of California, Berkeley, and its * contributors. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int spec_open(struct vnode **, int, struct cred *); static int spec_close(struct vnode *, int, int, offset_t, struct cred *); static int spec_read(struct vnode *, struct uio *, int, struct cred *, struct caller_context *); static int spec_write(struct vnode *, struct uio *, int, struct cred *, struct caller_context *); static int spec_ioctl(struct vnode *, int, intptr_t, int, struct cred *, int *); static int spec_getattr(struct vnode *, struct vattr *, int, struct cred *); static int spec_setattr(struct vnode *, struct vattr *, int, struct cred *, caller_context_t *); static int spec_access(struct vnode *, int, int, struct cred *); static int spec_create(struct vnode *, char *, vattr_t *, enum vcexcl, int, struct vnode **, struct cred *, int); static int spec_fsync(struct vnode *, int, struct cred *); static void spec_inactive(struct vnode *, struct cred *); static int spec_fid(struct vnode *, struct fid *); static int spec_seek(struct vnode *, offset_t, offset_t *); static int spec_frlock(struct vnode *, int, struct flock64 *, int, offset_t, struct flk_callback *, struct cred *); static int spec_realvp(struct vnode *, struct vnode **); static int spec_getpage(struct vnode *, offset_t, size_t, uint_t *, page_t **, size_t, struct seg *, caddr_t, enum seg_rw, struct cred *); static int spec_putapage(struct vnode *, page_t *, u_offset_t *, size_t *, int, struct cred *); static struct buf *spec_startio(struct vnode *, page_t *, u_offset_t, size_t, int); static int spec_getapage(struct vnode *, u_offset_t, size_t, uint_t *, page_t **, size_t, struct seg *, caddr_t, enum seg_rw, struct cred *); static int spec_map(struct vnode *, offset_t, struct as *, caddr_t *, size_t, uchar_t, uchar_t, uint_t, struct cred *); static int spec_addmap(struct vnode *, offset_t, struct as *, caddr_t, size_t, uchar_t, uchar_t, uint_t, struct cred *); static int spec_delmap(struct vnode *, offset_t, struct as *, caddr_t, size_t, uint_t, uint_t, uint_t, struct cred *); static int spec_poll(struct vnode *, short, int, short *, struct pollhead **); static int spec_dump(struct vnode *, caddr_t, int, int); static int spec_pageio(struct vnode *, page_t *, u_offset_t, size_t, int, cred_t *); static int spec_getsecattr(struct vnode *, vsecattr_t *, int, struct cred *); static int spec_setsecattr(struct vnode *, vsecattr_t *, int, struct cred *); static int spec_pathconf(struct vnode *, int, ulong_t *, struct cred *); #define SN_HOLD(csp) { \ mutex_enter(&csp->s_lock); \ csp->s_count++; \ mutex_exit(&csp->s_lock); \ } #define SN_RELE(csp) { \ mutex_enter(&csp->s_lock); \ csp->s_count--; \ ASSERT((csp->s_count > 0) || (csp->s_vnode->v_stream == NULL)); \ mutex_exit(&csp->s_lock); \ } #define S_ISFENCED(sp) ((VTOS((sp)->s_commonvp))->s_flag & SFENCED) struct vnodeops *spec_vnodeops; /* * *PLEASE NOTE*: If you add new entry points to specfs, do * not forget to add support for fencing. A fenced snode * is indicated by the SFENCED flag in the common snode. * If a snode is fenced, determine if your entry point is * a configuration operation (Example: open), a detection * operation (Example: gettattr), an I/O operation (Example: ioctl()) * or an unconfiguration operation (Example: close). If it is * a configuration or detection operation, fail the operation * for a fenced snode with an ENXIO or EIO as appropriate. If * it is any other operation, let it through. */ const fs_operation_def_t spec_vnodeops_template[] = { VOPNAME_OPEN, { .vop_open = spec_open }, VOPNAME_CLOSE, { .vop_close = spec_close }, VOPNAME_READ, { .vop_read = spec_read }, VOPNAME_WRITE, { .vop_write = spec_write }, VOPNAME_IOCTL, { .vop_ioctl = spec_ioctl }, VOPNAME_GETATTR, { .vop_getattr = spec_getattr }, VOPNAME_SETATTR, { .vop_setattr = spec_setattr }, VOPNAME_ACCESS, { .vop_access = spec_access }, VOPNAME_CREATE, { .vop_create = spec_create }, VOPNAME_FSYNC, { .vop_fsync = spec_fsync }, VOPNAME_INACTIVE, { .vop_inactive = spec_inactive }, VOPNAME_FID, { .vop_fid = spec_fid }, VOPNAME_SEEK, { .vop_seek = spec_seek }, VOPNAME_PATHCONF, { .vop_pathconf = spec_pathconf }, VOPNAME_FRLOCK, { .vop_frlock = spec_frlock }, VOPNAME_REALVP, { .vop_realvp = spec_realvp }, VOPNAME_GETPAGE, { .vop_getpage = spec_getpage }, VOPNAME_PUTPAGE, { .vop_putpage = spec_putpage }, VOPNAME_MAP, { .vop_map = spec_map }, VOPNAME_ADDMAP, { .vop_addmap = spec_addmap }, VOPNAME_DELMAP, { .vop_delmap = spec_delmap }, VOPNAME_POLL, { .vop_poll = spec_poll }, VOPNAME_DUMP, { .vop_dump = spec_dump }, VOPNAME_PAGEIO, { .vop_pageio = spec_pageio }, VOPNAME_SETSECATTR, { .vop_setsecattr = spec_setsecattr }, VOPNAME_GETSECATTR, { .vop_getsecattr = spec_getsecattr }, NULL, NULL }; /* * Return address of spec_vnodeops */ struct vnodeops * spec_getvnodeops(void) { return (spec_vnodeops); } extern vnode_t *rconsvp; /* * Acquire the serial lock on the common snode. */ #define LOCK_CSP(csp) (void) spec_lockcsp(csp, 0, 1, 0) #define LOCKHOLD_CSP_SIG(csp) spec_lockcsp(csp, 1, 1, 1) #define SYNCHOLD_CSP_SIG(csp, intr) spec_lockcsp(csp, intr, 0, 1) typedef enum { LOOP, INTR, SUCCESS } slock_ret_t; /* * Synchronize with active SLOCKED snode, optionally checking for a signal and * optionally returning with SLOCKED set and SN_HOLD done. The 'intr' * argument determines if the thread is interruptible by a signal while * waiting, the function returns INTR if interrupted while there is another * thread closing this snonde and LOOP if interrupted otherwise. * When SUCCESS is returned the 'hold' argument determines if the open * count (SN_HOLD) has been incremented and the 'setlock' argument * determines if the function returns with SLOCKED set. */ static slock_ret_t spec_lockcsp(struct snode *csp, int intr, int setlock, int hold) { slock_ret_t ret = SUCCESS; mutex_enter(&csp->s_lock); while (csp->s_flag & SLOCKED) { csp->s_flag |= SWANT; if (intr) { if (!cv_wait_sig(&csp->s_cv, &csp->s_lock)) { if (csp->s_flag & SCLOSING) ret = INTR; else ret = LOOP; mutex_exit(&csp->s_lock); return (ret); /* interrupted */ } } else { cv_wait(&csp->s_cv, &csp->s_lock); } } if (setlock) csp->s_flag |= SLOCKED; if (hold) csp->s_count++; /* one more open reference : SN_HOLD */ mutex_exit(&csp->s_lock); return (ret); /* serialized/locked */ } /* * Unlock the serial lock on the common snode */ #define UNLOCK_CSP_LOCK_HELD(csp) \ ASSERT(mutex_owned(&csp->s_lock)); \ if (csp->s_flag & SWANT) \ cv_broadcast(&csp->s_cv); \ csp->s_flag &= ~(SWANT|SLOCKED); #define UNLOCK_CSP(csp) \ mutex_enter(&csp->s_lock); \ UNLOCK_CSP_LOCK_HELD(csp); \ mutex_exit(&csp->s_lock); /* * compute/return the size of the device */ #define SPEC_SIZE(csp) \ (((csp)->s_flag & SSIZEVALID) ? (csp)->s_size : spec_size(csp)) /* * Compute and return the size. If the size in the common snode is valid then * return it. If not valid then get the size from the driver and set size in * the common snode. If the device has not been attached then we don't ask for * an update from the driver- for non-streams SSIZEVALID stays unset until the * device is attached. A stat of a mknod outside /devices (non-devfs) may * report UNKNOWN_SIZE because the device may not be attached yet (SDIPSET not * established in mknod until open time). An stat in /devices will report the * size correctly. Specfs should always call SPEC_SIZE instead of referring * directly to s_size to initialize/retrieve the size of a device. * * XXX There is an inconsistency between block and raw - "unknown" is * UNKNOWN_SIZE for VBLK and 0 for VCHR(raw). */ static u_offset_t spec_size(struct snode *csp) { struct vnode *cvp = STOV(csp); u_offset_t size; int plen; uint32_t size32; dev_t dev; dev_info_t *devi; major_t maj; uint_t blksize; int blkshift; ASSERT((csp)->s_commonvp == cvp); /* must be common node */ /* return cached value */ mutex_enter(&csp->s_lock); if (csp->s_flag & SSIZEVALID) { mutex_exit(&csp->s_lock); return (csp->s_size); } /* VOP_GETATTR of mknod has not had devcnt restriction applied */ dev = cvp->v_rdev; maj = getmajor(dev); if (maj >= devcnt) { /* return non-cached UNKNOWN_SIZE */ mutex_exit(&csp->s_lock); return ((cvp->v_type == VCHR) ? 0 : UNKNOWN_SIZE); } /* establish cached zero size for streams */ if (STREAMSTAB(maj)) { csp->s_size = 0; csp->s_flag |= SSIZEVALID; mutex_exit(&csp->s_lock); return (0); } /* * Return non-cached UNKNOWN_SIZE if not open. * * NB: This check is bogus, calling prop_op(9E) should be gated by * attach, not open. Not having this check however opens up a new * context under which a driver's prop_op(9E) could be called. Calling * prop_op(9E) in this new context has been shown to expose latent * driver bugs (insufficient NULL pointer checks that lead to panic). * We are keeping this open check for now to avoid these panics. */ if (csp->s_count == 0) { mutex_exit(&csp->s_lock); return ((cvp->v_type == VCHR) ? 0 : UNKNOWN_SIZE); } /* Return non-cached UNKNOWN_SIZE if not attached. */ if (((csp->s_flag & SDIPSET) == 0) || (csp->s_dip == NULL) || !i_ddi_devi_attached(csp->s_dip)) { mutex_exit(&csp->s_lock); return ((cvp->v_type == VCHR) ? 0 : UNKNOWN_SIZE); } devi = csp->s_dip; /* * Established cached size obtained from the attached driver. Since we * know the devinfo node, for efficiency we use cdev_prop_op directly * instead of [cb]dev_[Ss]size. */ if (cvp->v_type == VCHR) { size = 0; plen = sizeof (size); if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF, DDI_PROP_NOTPROM | DDI_PROP_DONTPASS | DDI_PROP_CONSUMER_TYPED, "Size", (caddr_t)&size, &plen) != DDI_PROP_SUCCESS) { plen = sizeof (size32); if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF, DDI_PROP_NOTPROM | DDI_PROP_DONTPASS, "size", (caddr_t)&size32, &plen) == DDI_PROP_SUCCESS) size = size32; } } else { size = UNKNOWN_SIZE; plen = sizeof (size); if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF, DDI_PROP_NOTPROM | DDI_PROP_DONTPASS | DDI_PROP_CONSUMER_TYPED, "Nblocks", (caddr_t)&size, &plen) != DDI_PROP_SUCCESS) { plen = sizeof (size32); if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF, DDI_PROP_NOTPROM | DDI_PROP_DONTPASS, "nblocks", (caddr_t)&size32, &plen) == DDI_PROP_SUCCESS) size = size32; } if (size != UNKNOWN_SIZE) { blksize = DEV_BSIZE; /* default */ plen = sizeof (blksize); /* try to get dev_t specific "blksize" */ if (cdev_prop_op(dev, devi, PROP_LEN_AND_VAL_BUF, DDI_PROP_NOTPROM | DDI_PROP_DONTPASS, "blksize", (caddr_t)&blksize, &plen) != DDI_PROP_SUCCESS) { /* * Try for dev_info node "device-blksize". * If this fails then blksize will still be * DEV_BSIZE default value. */ (void) cdev_prop_op(DDI_DEV_T_ANY, devi, PROP_LEN_AND_VAL_BUF, DDI_PROP_NOTPROM | DDI_PROP_DONTPASS, "device-blksize", (caddr_t)&blksize, &plen); } /* blksize must be a power of two */ ASSERT(BIT_ONLYONESET(blksize)); blkshift = highbit(blksize) - 1; /* convert from block size to byte size */ if (size < (MAXOFFSET_T >> blkshift)) size = size << blkshift; else size = UNKNOWN_SIZE; } } csp->s_size = size; csp->s_flag |= SSIZEVALID; mutex_exit(&csp->s_lock); return (size); } /* * This function deal with vnode substitution in the case of * device cloning. */ static int spec_clone(struct vnode **vpp, dev_t newdev, int vtype, struct stdata *stp) { dev_t dev = (*vpp)->v_rdev; major_t maj = getmajor(dev); major_t newmaj = getmajor(newdev); int sysclone = (maj == clone_major); int qassociate_used = 0; struct snode *oldsp, *oldcsp; struct snode *newsp, *newcsp; struct vnode *newvp, *newcvp; dev_info_t *dip; queue_t *dq; ASSERT(dev != newdev); /* * Check for cloning across different drivers. * We only support this under the system provided clone driver */ if ((maj != newmaj) && !sysclone) { cmn_err(CE_NOTE, "unsupported clone open maj = %u, newmaj = %u", maj, newmaj); return (ENXIO); } /* old */ oldsp = VTOS(*vpp); oldcsp = VTOS(oldsp->s_commonvp); /* new */ newvp = makespecvp(newdev, vtype); ASSERT(newvp != NULL); newsp = VTOS(newvp); newcvp = newsp->s_commonvp; newcsp = VTOS(newcvp); /* * Clones inherit fsid, realvp, and dip. * XXX realvp inherit is not occurring, does fstat of clone work? */ newsp->s_fsid = oldsp->s_fsid; if (sysclone) { newsp->s_flag |= SCLONE; dip = NULL; } else { newsp->s_flag |= SSELFCLONE; dip = oldcsp->s_dip; } /* * If we cloned to an opened newdev that already has called * spec_assoc_vp_with_devi (SDIPSET set) then the association is * already established. */ if (!(newcsp->s_flag & SDIPSET)) { /* * Establish s_dip association for newdev. * * If we trusted the getinfo(9E) DDI_INFO_DEVT2INSTANCE * implementation of all cloning drivers (SCLONE and SELFCLONE) * we would always use e_ddi_hold_devi_by_dev(). We know that * many drivers have had (still have?) problems with * DDI_INFO_DEVT2INSTANCE, so we try to minimize reliance by * detecting drivers that use QASSOCIATE (by looking down the * stream) and setting their s_dip association to NULL. */ qassociate_used = 0; if (stp) { for (dq = stp->sd_wrq; dq; dq = dq->q_next) { if (_RD(dq)->q_flag & _QASSOCIATED) { qassociate_used = 1; dip = NULL; break; } } } if (dip || qassociate_used) { spec_assoc_vp_with_devi(newvp, dip); } else { /* derive association from newdev */ dip = e_ddi_hold_devi_by_dev(newdev, 0); spec_assoc_vp_with_devi(newvp, dip); if (dip) ddi_release_devi(dip); } } SN_HOLD(newcsp); /* deal with stream stuff */ if (stp != NULL) { LOCK_CSP(newcsp); /* synchronize stream open/close */ mutex_enter(&newcsp->s_lock); newcvp->v_stream = newvp->v_stream = stp; stp->sd_vnode = newcvp; stp->sd_strtab = STREAMSTAB(newmaj); mutex_exit(&newcsp->s_lock); UNLOCK_CSP(newcsp); } /* substitute the vnode */ SN_RELE(oldcsp); VN_RELE(*vpp); *vpp = newvp; return (0); } static int spec_open(struct vnode **vpp, int flag, struct cred *cr) { major_t maj; dev_t dev, newdev; struct vnode *vp, *cvp; struct snode *sp, *csp; struct stdata *stp; dev_info_t *dip; int error, type; contract_t *ct = NULL; int open_returns_eintr; slock_ret_t spec_locksp_ret; flag &= ~FCREAT; /* paranoia */ vp = *vpp; sp = VTOS(vp); ASSERT((vp->v_type == VCHR) || (vp->v_type == VBLK)); if ((vp->v_type != VCHR) && (vp->v_type != VBLK)) return (ENXIO); /* * If the VFS_NODEVICES bit was set for the mount, * do not allow opens of special devices. */ if (sp->s_realvp && (sp->s_realvp->v_vfsp->vfs_flag & VFS_NODEVICES)) return (ENXIO); newdev = dev = vp->v_rdev; /* * If we are opening a node that has not had spec_assoc_vp_with_devi * called against it (mknod outside /devices or a non-dacf makespecvp * node) then SDIPSET will not be set. In this case we call an * interface which will reconstruct the path and lookup (drive attach) * through devfs (e_ddi_hold_devi_by_dev -> e_ddi_hold_devi_by_path -> * devfs_lookupname). For support of broken drivers that don't call * ddi_create_minor_node for all minor nodes in their instance space, * we call interfaces that operates at the directory/devinfo * (major/instance) level instead of to the leaf/minor node level. * After finding and attaching the dip we associate it with the * common specfs vnode (s_dip), which sets SDIPSET. A DL_DETACH_REQ * to style-2 stream driver may set s_dip to NULL with SDIPSET set. * * NOTE: Although e_ddi_hold_devi_by_dev takes a dev_t argument, its * implementation operates at the major/instance level since it only * need to return a dip. */ cvp = sp->s_commonvp; csp = VTOS(cvp); if (!(csp->s_flag & SDIPSET)) { /* try to attach, return error if we fail */ if ((dip = e_ddi_hold_devi_by_dev(dev, 0)) == NULL) return (ENXIO); /* associate dip with the common snode s_dip */ spec_assoc_vp_with_devi(vp, dip); ddi_release_devi(dip); /* from e_ddi_hold_devi_by_dev */ } /* check if device fenced off */ if (S_ISFENCED(sp)) return (ENXIO); #ifdef DEBUG /* verify attach/open exclusion guarantee */ dip = csp->s_dip; ASSERT((dip == NULL) || i_ddi_devi_attached(dip)); #endif /* DEBUG */ if ((error = secpolicy_spec_open(cr, vp, flag)) != 0) return (error); maj = getmajor(dev); if (STREAMSTAB(maj)) goto streams_open; /* * Wait for in progress last close to complete. This guarantees * to the driver writer that we will never be in the drivers * open and close on the same (dev_t, otype) at the same time. * Open count already incremented (SN_HOLD) on non-zero return. * The wait is interruptible by a signal if the driver sets the * D_OPEN_RETURNS_EINTR cb_ops(9S) cb_flag or sets the * ddi-open-returns-eintr(9P) property in its driver.conf. */ if ((devopsp[maj]->devo_cb_ops->cb_flag & D_OPEN_RETURNS_EINTR) || (devnamesp[maj].dn_flags & DN_OPEN_RETURNS_EINTR)) open_returns_eintr = 1; else open_returns_eintr = 0; while ((spec_locksp_ret = SYNCHOLD_CSP_SIG(csp, open_returns_eintr)) != SUCCESS) { if (spec_locksp_ret == INTR) return (EINTR); } /* non streams open */ type = (vp->v_type == VBLK ? OTYP_BLK : OTYP_CHR); error = dev_open(&newdev, flag, type, cr); /* deal with clone case */ if (error == 0 && dev != newdev) { error = spec_clone(vpp, newdev, vp->v_type, NULL); /* * bail on clone failure, further processing * results in undefined behaviors. */ if (error != 0) return (error); sp = VTOS(*vpp); csp = VTOS(sp->s_commonvp); } /* * create contracts only for userland opens * Successful open and cloning is done at this point. */ if (error == 0 && !(flag & FKLYR)) { int spec_type; spec_type = (STOV(csp)->v_type == VCHR) ? S_IFCHR : S_IFBLK; if (contract_device_open(newdev, spec_type, NULL) != 0) { error = EIO; } } if (error == 0) { sp->s_size = SPEC_SIZE(csp); if ((csp->s_flag & SNEEDCLOSE) == 0) { int nmaj = getmajor(newdev); mutex_enter(&csp->s_lock); /* successful open needs a close later */ csp->s_flag |= SNEEDCLOSE; /* * Invalidate possible cached "unknown" size * established by a VOP_GETATTR while open was in * progress, and the driver might fail prop_op(9E). */ if (((cvp->v_type == VCHR) && (csp->s_size == 0)) || ((cvp->v_type == VBLK) && (csp->s_size == UNKNOWN_SIZE))) csp->s_flag &= ~SSIZEVALID; if (devopsp[nmaj]->devo_cb_ops->cb_flag & D_64BIT) csp->s_flag |= SLOFFSET; if (devopsp[nmaj]->devo_cb_ops->cb_flag & D_U64BIT) csp->s_flag |= SLOFFSET | SANYOFFSET; mutex_exit(&csp->s_lock); } return (0); } /* * Open failed. If we missed a close operation because * we were trying to get the device open and it is the * last in progress open that is failing then call close. * * NOTE: Only non-streams open has this race condition. */ mutex_enter(&csp->s_lock); csp->s_count--; /* decrement open count : SN_RELE */ if ((csp->s_count == 0) && /* no outstanding open */ (csp->s_mapcnt == 0) && /* no mapping */ (csp->s_flag & SNEEDCLOSE)) { /* need a close */ csp->s_flag &= ~(SNEEDCLOSE | SSIZEVALID); /* See comment in spec_close() */ if (csp->s_flag & (SCLONE | SSELFCLONE)) csp->s_flag &= ~SDIPSET; csp->s_flag |= SCLOSING; mutex_exit(&csp->s_lock); ASSERT(*vpp != NULL); (void) device_close(*vpp, flag, cr); mutex_enter(&csp->s_lock); csp->s_flag &= ~SCLOSING; mutex_exit(&csp->s_lock); } else { mutex_exit(&csp->s_lock); } return (error); streams_open: if (vp->v_type != VCHR) return (ENXIO); /* * Lock common snode to prevent any new clone opens on this * stream while one is in progress. This is necessary since * the stream currently associated with the clone device will * not be part of it after the clone open completes. Unfortunately * we don't know in advance if this is a clone * device so we have to lock all opens. * * If we fail, it's because of an interrupt - EINTR return is an * expected aspect of opening a stream so we don't need to check * D_OPEN_RETURNS_EINTR. Open count already incremented (SN_HOLD) * on non-zero return. */ if (LOCKHOLD_CSP_SIG(csp) != SUCCESS) return (EINTR); error = stropen(cvp, &newdev, flag, cr); stp = cvp->v_stream; /* deal with the clone case */ if ((error == 0) && (dev != newdev)) { vp->v_stream = cvp->v_stream = NULL; UNLOCK_CSP(csp); error = spec_clone(vpp, newdev, vp->v_type, stp); /* * bail on clone failure, further processing * results in undefined behaviors. */ if (error != 0) return (error); sp = VTOS(*vpp); csp = VTOS(sp->s_commonvp); } else if (error == 0) { vp->v_stream = stp; UNLOCK_CSP(csp); } /* * create contracts only for userland opens * Successful open and cloning is done at this point. */ if (error == 0 && !(flag & FKLYR)) { /* STREAM is of type S_IFCHR */ if (contract_device_open(newdev, S_IFCHR, &ct) != 0) { UNLOCK_CSP(csp); (void) spec_close(vp, flag, 1, 0, cr); return (EIO); } } if (error == 0) { /* STREAMS devices don't have a size */ sp->s_size = csp->s_size = 0; if (!(stp->sd_flag & STRISTTY) || (flag & FNOCTTY)) return (0); /* try to allocate it as a controlling terminal */ if (strctty(stp) != EINTR) return (0); /* strctty() was interrupted by a signal */ if (ct) { /* we only create contracts for userland opens */ ASSERT(ttoproc(curthread)); (void) contract_abandon(ct, ttoproc(curthread), 0); } (void) spec_close(vp, flag, 1, 0, cr); return (EINTR); } /* * Deal with stropen failure. * * sd_flag in the stream head cannot change since the * common snode is locked before the call to stropen(). */ if ((stp != NULL) && (stp->sd_flag & STREOPENFAIL)) { /* * Open failed part way through. */ mutex_enter(&stp->sd_lock); stp->sd_flag &= ~STREOPENFAIL; mutex_exit(&stp->sd_lock); UNLOCK_CSP(csp); (void) spec_close(vp, flag, 1, 0, cr); } else { UNLOCK_CSP(csp); SN_RELE(csp); } return (error); } /*ARGSUSED2*/ static int spec_close( struct vnode *vp, int flag, int count, offset_t offset, struct cred *cr) { struct vnode *cvp; struct snode *sp, *csp; enum vtype type; dev_t dev; int error = 0; int sysclone; if (!(flag & FKLYR)) { /* this only applies to closes of devices from userland */ cleanlocks(vp, ttoproc(curthread)->p_pid, 0); cleanshares(vp, ttoproc(curthread)->p_pid); if (vp->v_stream) strclean(vp); } if (count > 1) return (0); /* we allow close to succeed even if device is fenced off */ sp = VTOS(vp); cvp = sp->s_commonvp; dev = sp->s_dev; type = vp->v_type; ASSERT(type == VCHR || type == VBLK); /* * Prevent close/close and close/open races by serializing closes * on this common snode. Clone opens are held up until after * we have closed this device so the streams linkage is maintained */ csp = VTOS(cvp); LOCK_CSP(csp); mutex_enter(&csp->s_lock); csp->s_count--; /* one fewer open reference : SN_RELE */ sysclone = sp->s_flag & SCLONE; /* * Invalidate size on each close. * * XXX We do this on each close because we don't have interfaces that * allow a driver to invalidate the size. Since clearing this on each * close this causes property overhead we skip /dev/null and * /dev/zero to avoid degrading kenbus performance. */ if (getmajor(dev) != mm_major) csp->s_flag &= ~SSIZEVALID; /* * Only call the close routine when the last open reference through * any [s, v]node goes away. This can be checked by looking at * s_count on the common vnode. */ if ((csp->s_count == 0) && (csp->s_mapcnt == 0)) { /* we don't need a close */ csp->s_flag &= ~(SNEEDCLOSE | SSIZEVALID); /* * A cloning driver may open-clone to the same dev_t that we * are closing before spec_inactive destroys the common snode. * If this occurs the s_dip association needs to be reevaluated. * We clear SDIPSET to force reevaluation in this case. When * reevaluation occurs (by spec_clone after open), if the * devinfo association has changed then the old association * will be released as the new association is established by * spec_assoc_vp_with_devi(). */ if (csp->s_flag & (SCLONE | SSELFCLONE)) csp->s_flag &= ~SDIPSET; csp->s_flag |= SCLOSING; mutex_exit(&csp->s_lock); error = device_close(vp, flag, cr); /* * Decrement the devops held in clnopen() */ if (sysclone) { ddi_rele_driver(getmajor(dev)); } mutex_enter(&csp->s_lock); csp->s_flag &= ~SCLOSING; } UNLOCK_CSP_LOCK_HELD(csp); mutex_exit(&csp->s_lock); return (error); } /*ARGSUSED2*/ static int spec_read( struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cr, struct caller_context *ct) { int error; struct snode *sp = VTOS(vp); dev_t dev = sp->s_dev; size_t n; ulong_t on; u_offset_t bdevsize; offset_t maxoff; offset_t off; struct vnode *blkvp; ASSERT(vp->v_type == VCHR || vp->v_type == VBLK); if (STREAMSTAB(getmajor(dev))) { /* stream */ ASSERT(vp->v_type == VCHR); smark(sp, SACC); return (strread(vp, uiop, cr)); } if (uiop->uio_resid == 0) return (0); /* * Plain old character devices that set D_U64BIT can have * unrestricted offsets. */ maxoff = spec_maxoffset(vp); ASSERT(maxoff != -1 || vp->v_type == VCHR); if (maxoff != -1 && (uiop->uio_loffset < 0 || uiop->uio_loffset + uiop->uio_resid > maxoff)) return (EINVAL); if (vp->v_type == VCHR) { smark(sp, SACC); ASSERT(STREAMSTAB(getmajor(dev)) == 0); return (cdev_read(dev, uiop, cr)); } /* * Block device. */ error = 0; blkvp = sp->s_commonvp; bdevsize = SPEC_SIZE(VTOS(blkvp)); do { caddr_t base; offset_t diff; off = uiop->uio_loffset & (offset_t)MAXBMASK; on = (size_t)(uiop->uio_loffset & MAXBOFFSET); n = (size_t)MIN(MAXBSIZE - on, uiop->uio_resid); diff = bdevsize - uiop->uio_loffset; if (diff <= 0) break; if (diff < n) n = (size_t)diff; if (vpm_enable) { error = vpm_data_copy(blkvp, (u_offset_t)(off + on), n, uiop, 1, NULL, 0, S_READ); } else { base = segmap_getmapflt(segkmap, blkvp, (u_offset_t)(off + on), n, 1, S_READ); error = uiomove(base + on, n, UIO_READ, uiop); } if (!error) { int flags = 0; /* * If we read a whole block, we won't need this * buffer again soon. */ if (n + on == MAXBSIZE) flags = SM_DONTNEED | SM_FREE; if (vpm_enable) { error = vpm_sync_pages(blkvp, off, n, flags); } else { error = segmap_release(segkmap, base, flags); } } else { if (vpm_enable) { (void) vpm_sync_pages(blkvp, off, n, 0); } else { (void) segmap_release(segkmap, base, 0); } if (bdevsize == UNKNOWN_SIZE) { error = 0; break; } } } while (error == 0 && uiop->uio_resid > 0 && n != 0); return (error); } /*ARGSUSED*/ static int spec_write( struct vnode *vp, struct uio *uiop, int ioflag, struct cred *cr, struct caller_context *ct) { int error; struct snode *sp = VTOS(vp); dev_t dev = sp->s_dev; size_t n; ulong_t on; u_offset_t bdevsize; offset_t maxoff; offset_t off; struct vnode *blkvp; ASSERT(vp->v_type == VCHR || vp->v_type == VBLK); if (STREAMSTAB(getmajor(dev))) { ASSERT(vp->v_type == VCHR); smark(sp, SUPD); return (strwrite(vp, uiop, cr)); } /* * Plain old character devices that set D_U64BIT can have * unrestricted offsets. */ maxoff = spec_maxoffset(vp); ASSERT(maxoff != -1 || vp->v_type == VCHR); if (maxoff != -1 && (uiop->uio_loffset < 0 || uiop->uio_loffset + uiop->uio_resid > maxoff)) return (EINVAL); if (vp->v_type == VCHR) { smark(sp, SUPD); ASSERT(STREAMSTAB(getmajor(dev)) == 0); return (cdev_write(dev, uiop, cr)); } if (uiop->uio_resid == 0) return (0); error = 0; blkvp = sp->s_commonvp; bdevsize = SPEC_SIZE(VTOS(blkvp)); do { int pagecreate; int newpage; caddr_t base; offset_t diff; off = uiop->uio_loffset & (offset_t)MAXBMASK; on = (ulong_t)(uiop->uio_loffset & MAXBOFFSET); n = (size_t)MIN(MAXBSIZE - on, uiop->uio_resid); pagecreate = 0; diff = bdevsize - uiop->uio_loffset; if (diff <= 0) { error = ENXIO; break; } if (diff < n) n = (size_t)diff; /* * Check to see if we can skip reading in the page * and just allocate the memory. We can do this * if we are going to rewrite the entire mapping * or if we are going to write to end of the device * from the beginning of the mapping. */ if (n == MAXBSIZE || (on == 0 && (off + n) == bdevsize)) pagecreate = 1; newpage = 0; if (vpm_enable) { error = vpm_data_copy(blkvp, (u_offset_t)(off + on), n, uiop, !pagecreate, NULL, 0, S_WRITE); } else { base = segmap_getmapflt(segkmap, blkvp, (u_offset_t)(off + on), n, !pagecreate, S_WRITE); /* * segmap_pagecreate() returns 1 if it calls * page_create_va() to allocate any pages. */ if (pagecreate) newpage = segmap_pagecreate(segkmap, base + on, n, 0); error = uiomove(base + on, n, UIO_WRITE, uiop); } if (!vpm_enable && pagecreate && uiop->uio_loffset < P2ROUNDUP_TYPED(off + on + n, PAGESIZE, offset_t)) { /* * We created pages w/o initializing them completely, * thus we need to zero the part that wasn't set up. * This can happen if we write to the end of the device * or if we had some sort of error during the uiomove. */ long nzero; offset_t nmoved; nmoved = (uiop->uio_loffset - (off + on)); if (nmoved < 0 || nmoved > n) { panic("spec_write: nmoved bogus"); /*NOTREACHED*/ } nzero = (long)P2ROUNDUP(on + n, PAGESIZE) - (on + nmoved); if (nzero < 0 || (on + nmoved + nzero > MAXBSIZE)) { panic("spec_write: nzero bogus"); /*NOTREACHED*/ } (void) kzero(base + on + nmoved, (size_t)nzero); } /* * Unlock the pages which have been allocated by * page_create_va() in segmap_pagecreate(). */ if (!vpm_enable && newpage) segmap_pageunlock(segkmap, base + on, (size_t)n, S_WRITE); if (error == 0) { int flags = 0; /* * Force write back for synchronous write cases. */ if (ioflag & (FSYNC|FDSYNC)) flags = SM_WRITE; else if (n + on == MAXBSIZE || IS_SWAPVP(vp)) { /* * Have written a whole block. * Start an asynchronous write and * mark the buffer to indicate that * it won't be needed again soon. * Push swap files here, since it * won't happen anywhere else. */ flags = SM_WRITE | SM_ASYNC | SM_DONTNEED; } smark(sp, SUPD|SCHG); if (vpm_enable) { error = vpm_sync_pages(blkvp, off, n, flags); } else { error = segmap_release(segkmap, base, flags); } } else { if (vpm_enable) { (void) vpm_sync_pages(blkvp, off, n, SM_INVAL); } else { (void) segmap_release(segkmap, base, SM_INVAL); } } } while (error == 0 && uiop->uio_resid > 0 && n != 0); return (error); } static int spec_ioctl(struct vnode *vp, int cmd, intptr_t arg, int mode, struct cred *cr, int *rvalp) { struct snode *sp; dev_t dev; int error; if (vp->v_type != VCHR) return (ENOTTY); /* * allow ioctls() to go through even for fenced snodes, as they * may include unconfiguration operation - for example popping of * streams modules. */ sp = VTOS(vp); dev = sp->s_dev; if (STREAMSTAB(getmajor(dev))) { error = strioctl(vp, cmd, arg, mode, U_TO_K, cr, rvalp); } else { error = cdev_ioctl(dev, cmd, arg, mode, cr, rvalp); } return (error); } static int spec_getattr(struct vnode *vp, struct vattr *vap, int flags, struct cred *cr) { int error; struct snode *sp; struct vnode *realvp; /* With ATTR_COMM we will not get attributes from realvp */ if (flags & ATTR_COMM) { sp = VTOS(vp); vp = sp->s_commonvp; } sp = VTOS(vp); /* we want stat() to fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); realvp = sp->s_realvp; if (realvp == NULL) { static int snode_shift = 0; /* * Calculate the amount of bitshift to a snode pointer which * will still keep it unique. See below. */ if (snode_shift == 0) snode_shift = highbit(sizeof (struct snode)); ASSERT(snode_shift > 0); /* * No real vnode behind this one. Fill in the fields * from the snode. * * This code should be refined to return only the * attributes asked for instead of all of them. */ vap->va_type = vp->v_type; vap->va_mode = 0; vap->va_uid = vap->va_gid = 0; vap->va_fsid = sp->s_fsid; /* * If the va_nodeid is > MAX_USHORT, then i386 stats might * fail. So we shift down the snode pointer to try and get * the most uniqueness into 16-bits. */ vap->va_nodeid = ((ino64_t)(uintptr_t)sp >> snode_shift) & 0xFFFF; vap->va_nlink = 0; vap->va_rdev = sp->s_dev; /* * va_nblocks is the number of 512 byte blocks used to store * the mknod for the device, not the number of blocks on the * device itself. This is typically zero since the mknod is * represented directly in the inode itself. */ vap->va_nblocks = 0; } else { error = VOP_GETATTR(realvp, vap, flags, cr); if (error != 0) return (error); } /* set the size from the snode */ vap->va_size = SPEC_SIZE(VTOS(sp->s_commonvp)); vap->va_blksize = MAXBSIZE; mutex_enter(&sp->s_lock); vap->va_atime.tv_sec = sp->s_atime; vap->va_mtime.tv_sec = sp->s_mtime; vap->va_ctime.tv_sec = sp->s_ctime; mutex_exit(&sp->s_lock); vap->va_atime.tv_nsec = 0; vap->va_mtime.tv_nsec = 0; vap->va_ctime.tv_nsec = 0; vap->va_seq = 0; return (0); } static int spec_setattr( struct vnode *vp, struct vattr *vap, int flags, struct cred *cr, caller_context_t *ctp) { struct snode *sp = VTOS(vp); struct vnode *realvp; int error; /* fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); if (vp->v_type == VCHR && vp->v_stream && (vap->va_mask & AT_SIZE)) { /* * 1135080: O_TRUNC should have no effect on * named pipes and terminal devices. */ ASSERT(vap->va_mask == AT_SIZE); return (0); } if ((realvp = sp->s_realvp) == NULL) error = 0; /* no real vnode to update */ else error = VOP_SETATTR(realvp, vap, flags, cr, ctp); if (error == 0) { /* * If times were changed, update snode. */ mutex_enter(&sp->s_lock); if (vap->va_mask & AT_ATIME) sp->s_atime = vap->va_atime.tv_sec; if (vap->va_mask & AT_MTIME) { sp->s_mtime = vap->va_mtime.tv_sec; sp->s_ctime = gethrestime_sec(); } mutex_exit(&sp->s_lock); } return (error); } static int spec_access(struct vnode *vp, int mode, int flags, struct cred *cr) { struct vnode *realvp; struct snode *sp = VTOS(vp); /* fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); if ((realvp = sp->s_realvp) != NULL) return (VOP_ACCESS(realvp, mode, flags, cr)); else return (0); /* Allow all access. */ } /* * This can be called if creat or an open with O_CREAT is done on the root * of a lofs mount where the mounted entity is a special file. */ /*ARGSUSED*/ static int spec_create(struct vnode *dvp, char *name, vattr_t *vap, enum vcexcl excl, int mode, struct vnode **vpp, struct cred *cr, int flag) { int error; struct snode *sp = VTOS(dvp); /* fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); ASSERT(dvp && (dvp->v_flag & VROOT) && *name == '\0'); if (excl == NONEXCL) { if (mode && (error = spec_access(dvp, mode, 0, cr))) return (error); VN_HOLD(dvp); return (0); } return (EEXIST); } /* * In order to sync out the snode times without multi-client problems, * make sure the times written out are never earlier than the times * already set in the vnode. */ static int spec_fsync(struct vnode *vp, int syncflag, struct cred *cr) { struct snode *sp = VTOS(vp); struct vnode *realvp; struct vnode *cvp; struct vattr va, vatmp; /* allow syncing even if device is fenced off */ /* If times didn't change, don't flush anything. */ mutex_enter(&sp->s_lock); if ((sp->s_flag & (SACC|SUPD|SCHG)) == 0 && vp->v_type != VBLK) { mutex_exit(&sp->s_lock); return (0); } sp->s_flag &= ~(SACC|SUPD|SCHG); mutex_exit(&sp->s_lock); cvp = sp->s_commonvp; realvp = sp->s_realvp; if (vp->v_type == VBLK && cvp != vp && vn_has_cached_data(cvp) && (cvp->v_flag & VISSWAP) == 0) (void) VOP_PUTPAGE(cvp, (offset_t)0, 0, 0, cr); /* * For devices that support it, force write cache to stable storage. * We don't need the lock to check s_flags since we can treat * SNOFLUSH as a hint. */ if ((vp->v_type == VBLK || vp->v_type == VCHR) && !(sp->s_flag & SNOFLUSH)) { int rval, rc; struct dk_callback spec_callback; spec_callback.dkc_flag = FLUSH_VOLATILE; spec_callback.dkc_callback = NULL; /* synchronous flush on volatile cache */ rc = cdev_ioctl(vp->v_rdev, DKIOCFLUSHWRITECACHE, (intptr_t)&spec_callback, FNATIVE|FKIOCTL, cr, &rval); if (rc == ENOTSUP || rc == ENOTTY) { mutex_enter(&sp->s_lock); sp->s_flag |= SNOFLUSH; mutex_exit(&sp->s_lock); } } /* * If no real vnode to update, don't flush anything. */ if (realvp == NULL) return (0); vatmp.va_mask = AT_ATIME|AT_MTIME; if (VOP_GETATTR(realvp, &vatmp, 0, cr) == 0) { mutex_enter(&sp->s_lock); if (vatmp.va_atime.tv_sec > sp->s_atime) va.va_atime = vatmp.va_atime; else { va.va_atime.tv_sec = sp->s_atime; va.va_atime.tv_nsec = 0; } if (vatmp.va_mtime.tv_sec > sp->s_mtime) va.va_mtime = vatmp.va_mtime; else { va.va_mtime.tv_sec = sp->s_mtime; va.va_mtime.tv_nsec = 0; } mutex_exit(&sp->s_lock); va.va_mask = AT_ATIME|AT_MTIME; (void) VOP_SETATTR(realvp, &va, 0, cr, NULL); } (void) VOP_FSYNC(realvp, syncflag, cr); return (0); } /*ARGSUSED*/ static void spec_inactive(struct vnode *vp, struct cred *cr) { struct snode *sp = VTOS(vp); struct vnode *cvp; struct vnode *rvp; /* * If no one has reclaimed the vnode, remove from the * cache now. */ if (vp->v_count < 1) { panic("spec_inactive: Bad v_count"); /*NOTREACHED*/ } mutex_enter(&stable_lock); mutex_enter(&vp->v_lock); /* * Drop the temporary hold by vn_rele now */ if (--vp->v_count != 0) { mutex_exit(&vp->v_lock); mutex_exit(&stable_lock); return; } mutex_exit(&vp->v_lock); sdelete(sp); mutex_exit(&stable_lock); /* We are the sole owner of sp now */ cvp = sp->s_commonvp; rvp = sp->s_realvp; if (rvp) { /* * If the snode times changed, then update the times * associated with the "realvp". */ if ((sp->s_flag & (SACC|SUPD|SCHG)) != 0) { struct vattr va, vatmp; mutex_enter(&sp->s_lock); sp->s_flag &= ~(SACC|SUPD|SCHG); mutex_exit(&sp->s_lock); vatmp.va_mask = AT_ATIME|AT_MTIME; /* * The user may not own the device, but we * want to update the attributes anyway. */ if (VOP_GETATTR(rvp, &vatmp, 0, kcred) == 0) { if (vatmp.va_atime.tv_sec > sp->s_atime) va.va_atime = vatmp.va_atime; else { va.va_atime.tv_sec = sp->s_atime; va.va_atime.tv_nsec = 0; } if (vatmp.va_mtime.tv_sec > sp->s_mtime) va.va_mtime = vatmp.va_mtime; else { va.va_mtime.tv_sec = sp->s_mtime; va.va_mtime.tv_nsec = 0; } va.va_mask = AT_ATIME|AT_MTIME; (void) VOP_SETATTR(rvp, &va, 0, kcred, NULL); } } } ASSERT(!vn_has_cached_data(vp)); vn_invalid(vp); /* if we are sharing another file systems vfs, release it */ if (vp->v_vfsp && (vp->v_vfsp != &spec_vfs)) VFS_RELE(vp->v_vfsp); /* if we have a realvp, release the realvp */ if (rvp) VN_RELE(rvp); /* if we have a common, release the common */ if (cvp && (cvp != vp)) { VN_RELE(cvp); #ifdef DEBUG } else if (cvp) { /* * if this is the last reference to a common vnode, any * associated stream had better have been closed */ ASSERT(cvp == vp); ASSERT(cvp->v_stream == NULL); #endif /* DEBUG */ } /* * if we have a hold on a devinfo node (established by * spec_assoc_vp_with_devi), release the hold */ if (sp->s_dip) ddi_release_devi(sp->s_dip); /* * If we have an associated device policy, release it. */ if (sp->s_plcy != NULL) dpfree(sp->s_plcy); /* * If all holds on the devinfo node are through specfs/devfs * and we just destroyed the last specfs node associated with the * device, then the devinfo node reference count should now be * zero. We can't check this because there may be other holds * on the node from non file system sources: ddi_hold_devi_by_instance * for example. */ kmem_cache_free(snode_cache, sp); } static int spec_fid(struct vnode *vp, struct fid *fidp) { struct vnode *realvp; struct snode *sp = VTOS(vp); if ((realvp = sp->s_realvp) != NULL) return (VOP_FID(realvp, fidp)); else return (EINVAL); } /*ARGSUSED1*/ static int spec_seek(struct vnode *vp, offset_t ooff, offset_t *noffp) { offset_t maxoff = spec_maxoffset(vp); if (maxoff == -1 || *noffp <= maxoff) return (0); else return (EINVAL); } static int spec_frlock( struct vnode *vp, int cmd, struct flock64 *bfp, int flag, offset_t offset, struct flk_callback *flk_cbp, struct cred *cr) { struct snode *sp = VTOS(vp); struct snode *csp; csp = VTOS(sp->s_commonvp); /* * If file is being mapped, disallow frlock. */ if (csp->s_mapcnt > 0) return (EAGAIN); return (fs_frlock(vp, cmd, bfp, flag, offset, flk_cbp, cr)); } static int spec_realvp(struct vnode *vp, struct vnode **vpp) { struct vnode *rvp; if ((rvp = VTOS(vp)->s_realvp) != NULL) { vp = rvp; if (VOP_REALVP(vp, &rvp) == 0) vp = rvp; } *vpp = vp; return (0); } /* * Return all the pages from [off..off + len] in block * or character device. */ static int spec_getpage( struct vnode *vp, offset_t off, size_t len, uint_t *protp, page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr) { struct snode *sp = VTOS(vp); int err; ASSERT(sp->s_commonvp == vp); /* * XXX Given the above assertion, this might not do * what is wanted here. */ if (vp->v_flag & VNOMAP) return (ENOSYS); TRACE_4(TR_FAC_SPECFS, TR_SPECFS_GETPAGE, "specfs getpage:vp %p off %llx len %ld snode %p", vp, off, len, sp); switch (vp->v_type) { case VBLK: if (protp != NULL) *protp = PROT_ALL; if (((u_offset_t)off + len) > (SPEC_SIZE(sp) + PAGEOFFSET)) return (EFAULT); /* beyond EOF */ if (len <= PAGESIZE) err = spec_getapage(vp, (u_offset_t)off, len, protp, pl, plsz, seg, addr, rw, cr); else err = pvn_getpages(spec_getapage, vp, (u_offset_t)off, len, protp, pl, plsz, seg, addr, rw, cr); break; case VCHR: cmn_err(CE_NOTE, "spec_getpage called for character device. " "Check any non-ON consolidation drivers"); err = 0; pl[0] = (page_t *)0; break; default: panic("spec_getpage: bad v_type 0x%x", vp->v_type); /*NOTREACHED*/ } return (err); } extern int klustsize; /* set in machdep.c */ int spec_ra = 1; int spec_lostpage; /* number of times we lost original page */ /*ARGSUSED2*/ static int spec_getapage( struct vnode *vp, u_offset_t off, size_t len, uint_t *protp, page_t *pl[], size_t plsz, struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr) { struct snode *sp; struct buf *bp; page_t *pp, *pp2; u_offset_t io_off1, io_off2; size_t io_len1; size_t io_len2; size_t blksz; u_offset_t blkoff; int dora, err; page_t *pagefound; uint_t xlen; size_t adj_klustsize; u_offset_t size; u_offset_t tmpoff; sp = VTOS(vp); TRACE_3(TR_FAC_SPECFS, TR_SPECFS_GETAPAGE, "specfs getapage:vp %p off %llx snode %p", vp, off, sp); reread: err = 0; bp = NULL; pp = NULL; pp2 = NULL; if (pl != NULL) pl[0] = NULL; size = SPEC_SIZE(VTOS(sp->s_commonvp)); if (spec_ra && sp->s_nextr == off) dora = 1; else dora = 0; if (size == UNKNOWN_SIZE) { dora = 0; adj_klustsize = PAGESIZE; } else { adj_klustsize = dora ? klustsize : PAGESIZE; } again: if ((pagefound = page_exists(vp, off)) == NULL) { if (rw == S_CREATE) { /* * We're allocating a swap slot and it's * associated page was not found, so allocate * and return it. */ if ((pp = page_create_va(vp, off, PAGESIZE, PG_WAIT, seg, addr)) == NULL) { panic("spec_getapage: page_create"); /*NOTREACHED*/ } io_len1 = PAGESIZE; sp->s_nextr = off + PAGESIZE; } else { /* * Need to really do disk I/O to get the page(s). */ blkoff = (off / adj_klustsize) * adj_klustsize; if (size == UNKNOWN_SIZE) { blksz = PAGESIZE; } else { if (blkoff + adj_klustsize <= size) blksz = adj_klustsize; else blksz = MIN(size - blkoff, adj_klustsize); } pp = pvn_read_kluster(vp, off, seg, addr, &tmpoff, &io_len1, blkoff, blksz, 0); io_off1 = tmpoff; /* * Make sure the page didn't sneek into the * cache while we blocked in pvn_read_kluster. */ if (pp == NULL) goto again; /* * Zero part of page which we are not * going to be reading from disk now. */ xlen = (uint_t)(io_len1 & PAGEOFFSET); if (xlen != 0) pagezero(pp->p_prev, xlen, PAGESIZE - xlen); bp = spec_startio(vp, pp, io_off1, io_len1, pl == NULL ? (B_ASYNC | B_READ) : B_READ); sp->s_nextr = io_off1 + io_len1; } } if (dora && rw != S_CREATE) { u_offset_t off2; caddr_t addr2; off2 = ((off / adj_klustsize) + 1) * adj_klustsize; addr2 = addr + (off2 - off); pp2 = NULL; /* * If we are past EOF then don't bother trying * with read-ahead. */ if (off2 >= size) pp2 = NULL; else { if (off2 + adj_klustsize <= size) blksz = adj_klustsize; else blksz = MIN(size - off2, adj_klustsize); pp2 = pvn_read_kluster(vp, off2, seg, addr2, &tmpoff, &io_len2, off2, blksz, 1); io_off2 = tmpoff; } if (pp2 != NULL) { /* * Zero part of page which we are not * going to be reading from disk now. */ xlen = (uint_t)(io_len2 & PAGEOFFSET); if (xlen != 0) pagezero(pp2->p_prev, xlen, PAGESIZE - xlen); (void) spec_startio(vp, pp2, io_off2, io_len2, B_READ | B_ASYNC); } } if (pl == NULL) return (err); if (bp != NULL) { err = biowait(bp); pageio_done(bp); if (err) { if (pp != NULL) pvn_read_done(pp, B_ERROR); return (err); } } if (pagefound) { se_t se = (rw == S_CREATE ? SE_EXCL : SE_SHARED); /* * Page exists in the cache, acquire the appropriate * lock. If this fails, start all over again. */ if ((pp = page_lookup(vp, off, se)) == NULL) { spec_lostpage++; goto reread; } pl[0] = pp; pl[1] = NULL; sp->s_nextr = off + PAGESIZE; return (0); } if (pp != NULL) pvn_plist_init(pp, pl, plsz, off, io_len1, rw); return (0); } /* * Flags are composed of {B_INVAL, B_DIRTY B_FREE, B_DONTNEED, B_FORCE}. * If len == 0, do from off to EOF. * * The normal cases should be len == 0 & off == 0 (entire vp list), * len == MAXBSIZE (from segmap_release actions), and len == PAGESIZE * (from pageout). */ int spec_putpage( struct vnode *vp, offset_t off, size_t len, int flags, struct cred *cr) { struct snode *sp = VTOS(vp); struct vnode *cvp; page_t *pp; u_offset_t io_off; size_t io_len = 0; /* for lint */ int err = 0; u_offset_t size; u_offset_t tmpoff; ASSERT(vp->v_count != 0); if (vp->v_flag & VNOMAP) return (ENOSYS); cvp = sp->s_commonvp; size = SPEC_SIZE(VTOS(cvp)); if (!vn_has_cached_data(vp) || off >= size) return (0); ASSERT(vp->v_type == VBLK && cvp == vp); TRACE_4(TR_FAC_SPECFS, TR_SPECFS_PUTPAGE, "specfs putpage:vp %p off %llx len %ld snode %p", vp, off, len, sp); if (len == 0) { /* * Search the entire vp list for pages >= off. */ err = pvn_vplist_dirty(vp, off, spec_putapage, flags, cr); } else { u_offset_t eoff; /* * Loop over all offsets in the range [off...off + len] * looking for pages to deal with. We set limits so * that we kluster to klustsize boundaries. */ eoff = off + len; for (io_off = off; io_off < eoff && io_off < size; io_off += io_len) { /* * If we are not invalidating, synchronously * freeing or writing pages use the routine * page_lookup_nowait() to prevent reclaiming * them from the free list. */ if ((flags & B_INVAL) || ((flags & B_ASYNC) == 0)) { pp = page_lookup(vp, io_off, (flags & (B_INVAL | B_FREE)) ? SE_EXCL : SE_SHARED); } else { pp = page_lookup_nowait(vp, io_off, (flags & B_FREE) ? SE_EXCL : SE_SHARED); } if (pp == NULL || pvn_getdirty(pp, flags) == 0) io_len = PAGESIZE; else { err = spec_putapage(vp, pp, &tmpoff, &io_len, flags, cr); io_off = tmpoff; if (err != 0) break; /* * "io_off" and "io_len" are returned as * the range of pages we actually wrote. * This allows us to skip ahead more quickly * since several pages may've been dealt * with by this iteration of the loop. */ } } } return (err); } /* * Write out a single page, possibly klustering adjacent * dirty pages. */ /*ARGSUSED5*/ static int spec_putapage( struct vnode *vp, page_t *pp, u_offset_t *offp, /* return value */ size_t *lenp, /* return value */ int flags, struct cred *cr) { struct snode *sp = VTOS(vp); u_offset_t io_off; size_t io_len; size_t blksz; u_offset_t blkoff; int err = 0; struct buf *bp; u_offset_t size; size_t adj_klustsize; u_offset_t tmpoff; /* * Destroy read ahead value since we are really going to write. */ sp->s_nextr = 0; size = SPEC_SIZE(VTOS(sp->s_commonvp)); adj_klustsize = klustsize; blkoff = (pp->p_offset / adj_klustsize) * adj_klustsize; if (blkoff + adj_klustsize <= size) blksz = adj_klustsize; else blksz = size - blkoff; /* * Find a kluster that fits in one contiguous chunk. */ pp = pvn_write_kluster(vp, pp, &tmpoff, &io_len, blkoff, blksz, flags); io_off = tmpoff; /* * Check for page length rounding problems * XXX - Is this necessary? */ if (io_off + io_len > size) { ASSERT((io_off + io_len) - size < PAGESIZE); io_len = size - io_off; } bp = spec_startio(vp, pp, io_off, io_len, B_WRITE | flags); /* * Wait for i/o to complete if the request is not B_ASYNC. */ if ((flags & B_ASYNC) == 0) { err = biowait(bp); pageio_done(bp); pvn_write_done(pp, ((err) ? B_ERROR : 0) | B_WRITE | flags); } if (offp) *offp = io_off; if (lenp) *lenp = io_len; TRACE_4(TR_FAC_SPECFS, TR_SPECFS_PUTAPAGE, "specfs putapage:vp %p offp %p snode %p err %d", vp, offp, sp, err); return (err); } /* * Flags are composed of {B_ASYNC, B_INVAL, B_FREE, B_DONTNEED} */ static struct buf * spec_startio( struct vnode *vp, page_t *pp, u_offset_t io_off, size_t io_len, int flags) { struct buf *bp; bp = pageio_setup(pp, io_len, vp, flags); bp->b_edev = vp->v_rdev; bp->b_dev = cmpdev(vp->v_rdev); bp->b_blkno = btodt(io_off); bp->b_un.b_addr = (caddr_t)0; (void) bdev_strategy(bp); if (flags & B_READ) lwp_stat_update(LWP_STAT_INBLK, 1); else lwp_stat_update(LWP_STAT_OUBLK, 1); return (bp); } static int spec_poll( struct vnode *vp, short events, int anyyet, short *reventsp, struct pollhead **phpp) { dev_t dev; int error; if (vp->v_type == VBLK) error = fs_poll(vp, events, anyyet, reventsp, phpp); else { ASSERT(vp->v_type == VCHR); dev = vp->v_rdev; if (STREAMSTAB(getmajor(dev))) { ASSERT(vp->v_stream != NULL); error = strpoll(vp->v_stream, events, anyyet, reventsp, phpp); } else if (devopsp[getmajor(dev)]->devo_cb_ops->cb_chpoll) { error = cdev_poll(dev, events, anyyet, reventsp, phpp); } else { error = fs_poll(vp, events, anyyet, reventsp, phpp); } } return (error); } /* * This routine is called through the cdevsw[] table to handle * traditional mmap'able devices that support a d_mmap function. */ /*ARGSUSED8*/ int spec_segmap( dev_t dev, off_t off, struct as *as, caddr_t *addrp, off_t len, uint_t prot, uint_t maxprot, uint_t flags, struct cred *cred) { struct segdev_crargs dev_a; int (*mapfunc)(dev_t dev, off_t off, int prot); size_t i; int error; if ((mapfunc = devopsp[getmajor(dev)]->devo_cb_ops->cb_mmap) == nodev) return (ENODEV); TRACE_4(TR_FAC_SPECFS, TR_SPECFS_SEGMAP, "specfs segmap:dev %x as %p len %lx prot %x", dev, as, len, prot); /* * Character devices that support the d_mmap * interface can only be mmap'ed shared. */ if ((flags & MAP_TYPE) != MAP_SHARED) return (EINVAL); /* * Check to ensure that the entire range is * legal and we are not trying to map in * more than the device will let us. */ for (i = 0; i < len; i += PAGESIZE) { if (cdev_mmap(mapfunc, dev, off + i, maxprot) == -1) return (ENXIO); } as_rangelock(as); if ((flags & MAP_FIXED) == 0) { /* * Pick an address w/o worrying about * any vac alignment constraints. */ map_addr(addrp, len, (offset_t)off, 0, flags); if (*addrp == NULL) { as_rangeunlock(as); return (ENOMEM); } } else { /* * User-specified address; blow away any previous mappings. */ (void) as_unmap(as, *addrp, len); } dev_a.mapfunc = mapfunc; dev_a.dev = dev; dev_a.offset = off; dev_a.prot = (uchar_t)prot; dev_a.maxprot = (uchar_t)maxprot; dev_a.hat_flags = 0; dev_a.hat_attr = 0; dev_a.devmap_data = NULL; error = as_map(as, *addrp, len, segdev_create, &dev_a); as_rangeunlock(as); return (error); } int spec_char_map( dev_t dev, offset_t off, struct as *as, caddr_t *addrp, size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, struct cred *cred) { int error = 0; major_t maj = getmajor(dev); int map_flag; int (*segmap)(dev_t, off_t, struct as *, caddr_t *, off_t, uint_t, uint_t, uint_t, cred_t *); int (*devmap)(dev_t, devmap_cookie_t, offset_t, size_t, size_t *, uint_t); int (*mmap)(dev_t dev, off_t off, int prot); /* * Character device: let the device driver * pick the appropriate segment driver. * * 4.x compat.: allow 'NULL' cb_segmap => spec_segmap * Kindness: allow 'nulldev' cb_segmap => spec_segmap */ segmap = devopsp[maj]->devo_cb_ops->cb_segmap; if (segmap == NULL || segmap == nulldev || segmap == nodev) { mmap = devopsp[maj]->devo_cb_ops->cb_mmap; map_flag = devopsp[maj]->devo_cb_ops->cb_flag; /* * Use old mmap framework if the driver has both mmap * and devmap entry points. This is to prevent the * system from calling invalid devmap entry point * for some drivers that might have put garbage in the * devmap entry point. */ if ((map_flag & D_DEVMAP) || mmap == NULL || mmap == nulldev || mmap == nodev) { devmap = devopsp[maj]->devo_cb_ops->cb_devmap; /* * If driver provides devmap entry point in * cb_ops but not xx_segmap(9E), call * devmap_setup with default settings * (NULL) for callback_ops and driver * callback private data */ if (devmap == nodev || devmap == NULL || devmap == nulldev) return (ENODEV); error = devmap_setup(dev, off, as, addrp, len, prot, maxprot, flags, cred); return (error); } else segmap = spec_segmap; } else segmap = cdev_segmap; return ((*segmap)(dev, (off_t)off, as, addrp, len, prot, maxprot, flags, cred)); } static int spec_map( struct vnode *vp, offset_t off, struct as *as, caddr_t *addrp, size_t len, uchar_t prot, uchar_t maxprot, uint_t flags, struct cred *cred) { int error = 0; struct snode *sp = VTOS(vp); if (vp->v_flag & VNOMAP) return (ENOSYS); /* fail map with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); /* * If file is locked, fail mapping attempt. */ if (vn_has_flocks(vp)) return (EAGAIN); if (vp->v_type == VCHR) { return (spec_char_map(vp->v_rdev, off, as, addrp, len, prot, maxprot, flags, cred)); } else if (vp->v_type == VBLK) { struct segvn_crargs vn_a; struct vnode *cvp; struct snode *sp; /* * Block device, use segvn mapping to the underlying commonvp * for pages. */ if (off > spec_maxoffset(vp)) return (ENXIO); sp = VTOS(vp); cvp = sp->s_commonvp; ASSERT(cvp != NULL); if (off < 0 || ((offset_t)(off + len) < 0)) return (ENXIO); as_rangelock(as); if ((flags & MAP_FIXED) == 0) { map_addr(addrp, len, off, 1, flags); if (*addrp == NULL) { as_rangeunlock(as); return (ENOMEM); } } else { /* * User-specified address; blow away any * previous mappings. */ (void) as_unmap(as, *addrp, len); } vn_a.vp = cvp; vn_a.offset = off; vn_a.type = flags & MAP_TYPE; vn_a.prot = (uchar_t)prot; vn_a.maxprot = (uchar_t)maxprot; vn_a.flags = flags & ~MAP_TYPE; vn_a.cred = cred; vn_a.amp = NULL; vn_a.szc = 0; vn_a.lgrp_mem_policy_flags = 0; error = as_map(as, *addrp, len, segvn_create, &vn_a); as_rangeunlock(as); } else return (ENODEV); return (error); } /*ARGSUSED1*/ static int spec_addmap( struct vnode *vp, /* the common vnode */ offset_t off, struct as *as, caddr_t addr, size_t len, /* how many bytes to add */ uchar_t prot, uchar_t maxprot, uint_t flags, struct cred *cred) { int error = 0; struct snode *csp = VTOS(vp); ulong_t npages; ASSERT(vp != NULL && VTOS(vp)->s_commonvp == vp); /* * XXX Given the above assertion, this might not * be a particularly sensible thing to test. */ if (vp->v_flag & VNOMAP) return (ENOSYS); /* fail with EIO if the device is fenced off */ if (S_ISFENCED(csp)) return (EIO); npages = btopr(len); LOCK_CSP(csp); csp->s_mapcnt += npages; UNLOCK_CSP(csp); return (error); } /*ARGSUSED1*/ static int spec_delmap( struct vnode *vp, /* the common vnode */ offset_t off, struct as *as, caddr_t addr, size_t len, /* how many bytes to take away */ uint_t prot, uint_t maxprot, uint_t flags, struct cred *cred) { struct snode *csp = VTOS(vp); ulong_t npages; long mcnt; /* segdev passes us the common vp */ ASSERT(vp != NULL && VTOS(vp)->s_commonvp == vp); /* allow delmap to succeed even if device fenced off */ /* * XXX Given the above assertion, this might not * be a particularly sensible thing to test.. */ if (vp->v_flag & VNOMAP) return (ENOSYS); npages = btopr(len); LOCK_CSP(csp); mutex_enter(&csp->s_lock); mcnt = (csp->s_mapcnt -= npages); if (mcnt == 0) { /* * Call the close routine when the last reference of any * kind through any [s, v]node goes away. The s_dip hold * on the devinfo node is released when the vnode is * destroyed. */ if (csp->s_count == 0) { csp->s_flag &= ~(SNEEDCLOSE | SSIZEVALID); /* See comment in spec_close() */ if (csp->s_flag & (SCLONE | SSELFCLONE)) csp->s_flag &= ~SDIPSET; mutex_exit(&csp->s_lock); (void) device_close(vp, 0, cred); } else mutex_exit(&csp->s_lock); mutex_enter(&csp->s_lock); } ASSERT(mcnt >= 0); UNLOCK_CSP_LOCK_HELD(csp); mutex_exit(&csp->s_lock); return (0); } static int spec_dump(struct vnode *vp, caddr_t addr, int bn, int count) { /* allow dump to succeed even if device fenced off */ ASSERT(vp->v_type == VBLK); return (bdev_dump(vp->v_rdev, addr, bn, count)); } /* * Do i/o on the given page list from/to vp, io_off for io_len. * Flags are composed of: * {B_ASYNC, B_INVAL, B_FREE, B_DONTNEED, B_READ, B_WRITE} * If B_ASYNC is not set i/o is waited for. */ /*ARGSUSED5*/ static int spec_pageio( struct vnode *vp, page_t *pp, u_offset_t io_off, size_t io_len, int flags, cred_t *cr) { struct buf *bp = NULL; int err = 0; if (pp == NULL) return (EINVAL); bp = spec_startio(vp, pp, io_off, io_len, flags); /* * Wait for i/o to complete if the request is not B_ASYNC. */ if ((flags & B_ASYNC) == 0) { err = biowait(bp); pageio_done(bp); } return (err); } /* * Set ACL on underlying vnode if one exists, or return ENOSYS otherwise. */ int spec_setsecattr(struct vnode *vp, vsecattr_t *vsap, int flag, struct cred *cr) { struct vnode *realvp; struct snode *sp = VTOS(vp); int error; /* fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); /* * The acl(2) system calls VOP_RWLOCK on the file before setting an * ACL, but since specfs does not serialize reads and writes, this * VOP does not do anything. However, some backing file systems may * expect the lock to be held before setting an ACL, so it is taken * here privately to avoid serializing specfs reads and writes. */ if ((realvp = sp->s_realvp) != NULL) { (void) VOP_RWLOCK(realvp, V_WRITELOCK_TRUE, NULL); error = VOP_SETSECATTR(realvp, vsap, flag, cr); (void) VOP_RWUNLOCK(realvp, V_WRITELOCK_TRUE, NULL); return (error); } else return (fs_nosys()); } /* * Get ACL from underlying vnode if one exists, or fabricate it from * the permissions returned by spec_getattr() otherwise. */ int spec_getsecattr(struct vnode *vp, vsecattr_t *vsap, int flag, struct cred *cr) { struct vnode *realvp; struct snode *sp = VTOS(vp); /* fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); if ((realvp = sp->s_realvp) != NULL) return (VOP_GETSECATTR(realvp, vsap, flag, cr)); else return (fs_fab_acl(vp, vsap, flag, cr)); } int spec_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr) { vnode_t *realvp; struct snode *sp = VTOS(vp); /* fail with ENXIO if the device is fenced off */ if (S_ISFENCED(sp)) return (ENXIO); if ((realvp = sp->s_realvp) != NULL) return (VOP_PATHCONF(realvp, cmd, valp, cr)); else return (fs_pathconf(vp, cmd, valp, cr)); }