/* $NetBSD: vfs_vnops.c,v 1.110 2006/05/14 05:30:31 christos Exp $ */ /* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 */ #include __KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.110 2006/05/14 05:30:31 christos Exp $"); #include "opt_verified_exec.h" #include "fs_union.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef UNION #include #endif #if defined(LKM) || defined(UNION) int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); #endif #ifdef VERIFIED_EXEC #include #endif static int vn_read(struct file *fp, off_t *offset, struct uio *uio, struct ucred *cred, int flags); static int vn_write(struct file *fp, off_t *offset, struct uio *uio, struct ucred *cred, int flags); static int vn_closefile(struct file *fp, struct lwp *l); static int vn_poll(struct file *fp, int events, struct lwp *l); static int vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l); static int vn_statfile(struct file *fp, struct stat *sb, struct lwp *l); static int vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l); const struct fileops vnops = { vn_read, vn_write, vn_ioctl, vn_fcntl, vn_poll, vn_statfile, vn_closefile, vn_kqfilter }; /* * Common code for vnode open operations. * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. */ int vn_open(struct nameidata *ndp, int fmode, int cmode) { struct vnode *vp; struct mount *mp = NULL; /* XXX: GCC */ struct lwp *l = ndp->ni_cnd.cn_lwp; struct ucred *cred = l->l_proc->p_ucred; struct vattr va; int error; #ifdef VERIFIED_EXEC struct veriexec_hash_entry *vhe = NULL; char pathbuf[MAXPATHLEN]; size_t pathlen; int (*copyfun)(const void *, void *, size_t, size_t *) = ndp->ni_segflg == UIO_SYSSPACE ? copystr : copyinstr; #endif /* VERIFIED_EXEC */ #ifdef VERIFIED_EXEC error = (*copyfun)(ndp->ni_dirp, pathbuf, sizeof(pathbuf), &pathlen); if (error) { if (veriexec_verbose >= 1) printf("veriexec: Can't copy path. (error=%d)\n", error); return (error); } #endif /* VERIFIED_EXEC */ restart: if (fmode & O_CREAT) { ndp->ni_cnd.cn_nameiop = CREATE; ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF; if ((fmode & O_EXCL) == 0 && ((fmode & O_NOFOLLOW) == 0)) ndp->ni_cnd.cn_flags |= FOLLOW; if ((error = namei(ndp)) != 0) return (error); if (ndp->ni_vp == NULL) { #ifdef VERIFIED_EXEC /* Lockdown mode: Prevent creation of new files. */ if (veriexec_strict >= 3) { VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); printf("Veriexec: vn_open: Preventing " "new file creation in %s.\n", pathbuf); vp = ndp->ni_dvp; error = EPERM; goto bad; } #endif /* VERIFIED_EXEC */ VATTR_NULL(&va); va.va_type = VREG; va.va_mode = cmode; if (fmode & O_EXCL) va.va_vaflags |= VA_EXCLUSIVE; if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); vput(ndp->ni_dvp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VOP_LEASE(ndp->ni_dvp, l, cred, LEASE_WRITE); error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd, &va); vn_finished_write(mp, 0); if (error) return (error); fmode &= ~O_TRUNC; vp = ndp->ni_vp; } else { VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); if (ndp->ni_dvp == ndp->ni_vp) vrele(ndp->ni_dvp); else vput(ndp->ni_dvp); ndp->ni_dvp = NULL; vp = ndp->ni_vp; if (fmode & O_EXCL) { error = EEXIST; goto bad; } fmode &= ~O_CREAT; } } else { ndp->ni_cnd.cn_nameiop = LOOKUP; ndp->ni_cnd.cn_flags = LOCKLEAF; if ((fmode & O_NOFOLLOW) == 0) ndp->ni_cnd.cn_flags |= FOLLOW; if ((error = namei(ndp)) != 0) return (error); vp = ndp->ni_vp; } if (vp->v_type == VSOCK) { error = EOPNOTSUPP; goto bad; } if (ndp->ni_vp->v_type == VLNK) { error = EFTYPE; goto bad; } #ifdef VERIFIED_EXEC if ((error = VOP_GETATTR(vp, &va, cred, l)) != 0) goto bad; #endif if ((fmode & O_CREAT) == 0) { #ifdef VERIFIED_EXEC if ((error = veriexec_verify(l, vp, &va, pathbuf, VERIEXEC_FILE, &vhe)) != 0) goto bad; #endif if (fmode & FREAD) { if ((error = VOP_ACCESS(vp, VREAD, cred, l)) != 0) goto bad; } if (fmode & (FWRITE | O_TRUNC)) { if (vp->v_type == VDIR) { error = EISDIR; goto bad; } if ((error = vn_writechk(vp)) != 0 || (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0) goto bad; #ifdef VERIFIED_EXEC if (vhe != NULL) { veriexec_report("Write access request.", pathbuf, &va, l, REPORT_NOVERBOSE, REPORT_ALARM, REPORT_NOPANIC); /* IPS mode: Deny writing to monitored files. */ if (veriexec_strict >= 2) { error = EPERM; goto bad; } else { vhe->status = FINGERPRINT_NOTEVAL; } } #endif } } if (fmode & O_TRUNC) { VOP_UNLOCK(vp, 0); /* XXX */ if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { vrele(vp); return (error); } VOP_LEASE(vp, l, cred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ VATTR_NULL(&va); va.va_size = 0; error = VOP_SETATTR(vp, &va, cred, l); vn_finished_write(mp, 0); if (error != 0) goto bad; } if ((error = VOP_OPEN(vp, fmode, cred, l)) != 0) goto bad; if (vp->v_type == VREG && uvn_attach(vp, fmode & FWRITE ? VM_PROT_WRITE : 0) == NULL) { error = EIO; goto bad; } if (fmode & FWRITE) vp->v_writecount++; return (0); bad: vput(vp); return (error); } /* * Check for write permissions on the specified vnode. * Prototype text segments cannot be written. */ int vn_writechk(struct vnode *vp) { /* * If the vnode is in use as a process's text, * we can't allow writing. */ if (vp->v_flag & VTEXT) return (ETXTBSY); return (0); } /* * Mark a vnode as having executable mappings. */ void vn_markexec(struct vnode *vp) { if ((vp->v_flag & VEXECMAP) == 0) { uvmexp.filepages -= vp->v_uobj.uo_npages; uvmexp.execpages += vp->v_uobj.uo_npages; } vp->v_flag |= VEXECMAP; } /* * Mark a vnode as being the text of a process. * Fail if the vnode is currently writable. */ int vn_marktext(struct vnode *vp) { if (vp->v_writecount != 0) { KASSERT((vp->v_flag & VTEXT) == 0); return (ETXTBSY); } vp->v_flag |= VTEXT; vn_markexec(vp); return (0); } /* * Vnode close call * * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. */ int vn_close(struct vnode *vp, int flags, struct ucred *cred, struct lwp *l) { int error; if (flags & FWRITE) vp->v_writecount--; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_CLOSE(vp, flags, cred, l); vput(vp); return (error); } /* * Package up an I/O request on a vnode into a uio and do it. */ int vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len, off_t offset, enum uio_seg segflg, int ioflg, struct ucred *cred, size_t *aresid, struct lwp *l) { struct uio auio; struct iovec aiov; struct mount *mp = NULL; int error; if ((ioflg & IO_NODELOCKED) == 0) { if (rw == UIO_READ) { vn_lock(vp, LK_SHARED | LK_RETRY); } else /* UIO_WRITE */ { if (vp->v_type != VCHR && (error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); } } auio.uio_iov = &aiov; auio.uio_iovcnt = 1; aiov.iov_base = base; aiov.iov_len = len; auio.uio_resid = len; auio.uio_offset = offset; auio.uio_rw = rw; if (segflg == UIO_SYSSPACE) { UIO_SETUP_SYSSPACE(&auio); } else { auio.uio_vmspace = l->l_proc->p_vmspace; } if (rw == UIO_READ) { error = VOP_READ(vp, &auio, ioflg, cred); } else { error = VOP_WRITE(vp, &auio, ioflg, cred); } if (aresid) *aresid = auio.uio_resid; else if (auio.uio_resid && error == 0) error = EIO; if ((ioflg & IO_NODELOCKED) == 0) { if (rw == UIO_WRITE) vn_finished_write(mp, 0); VOP_UNLOCK(vp, 0); } return (error); } int vn_readdir(struct file *fp, char *bf, int segflg, u_int count, int *done, struct lwp *l, off_t **cookies, int *ncookies) { struct vnode *vp = (struct vnode *)fp->f_data; struct iovec aiov; struct uio auio; int error, eofflag; unionread: if (vp->v_type != VDIR) return (EINVAL); aiov.iov_base = bf; aiov.iov_len = count; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; if (segflg == UIO_SYSSPACE) { UIO_SETUP_SYSSPACE(&auio); } else { KASSERT(l == curlwp); auio.uio_vmspace = l->l_proc->p_vmspace; } auio.uio_resid = count; vn_lock(vp, LK_SHARED | LK_RETRY); auio.uio_offset = fp->f_offset; error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, ncookies); fp->f_offset = auio.uio_offset; VOP_UNLOCK(vp, 0); if (error) return (error); #if defined(UNION) || defined(LKM) if (count == auio.uio_resid && vn_union_readdir_hook) { struct vnode *ovp = vp; error = (*vn_union_readdir_hook)(&vp, fp, l); if (error) return (error); if (vp != ovp) goto unionread; } #endif /* UNION || LKM */ if (count == auio.uio_resid && (vp->v_flag & VROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) { struct vnode *tvp = vp; vp = vp->v_mount->mnt_vnodecovered; VREF(vp); fp->f_data = vp; fp->f_offset = 0; vrele(tvp); goto unionread; } *done = count - auio.uio_resid; return error; } /* * File table vnode read routine. */ static int vn_read(struct file *fp, off_t *offset, struct uio *uio, struct ucred *cred, int flags) { struct vnode *vp = (struct vnode *)fp->f_data; int count, error, ioflag; struct lwp *l = curlwp; VOP_LEASE(vp, l, cred, LEASE_READ); ioflag = IO_ADV_ENCODE(fp->f_advice); if (fp->f_flag & FNONBLOCK) ioflag |= IO_NDELAY; if ((fp->f_flag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) ioflag |= IO_SYNC; if (fp->f_flag & FALTIO) ioflag |= IO_ALTSEMANTICS; vn_lock(vp, LK_SHARED | LK_RETRY); uio->uio_offset = *offset; count = uio->uio_resid; error = VOP_READ(vp, uio, ioflag, cred); if (flags & FOF_UPDATE_OFFSET) *offset += count - uio->uio_resid; VOP_UNLOCK(vp, 0); return (error); } /* * File table vnode write routine. */ static int vn_write(struct file *fp, off_t *offset, struct uio *uio, struct ucred *cred, int flags) { struct vnode *vp = (struct vnode *)fp->f_data; struct mount *mp; int count, error, ioflag = IO_UNIT; struct lwp *l = curlwp; if (vp->v_type == VREG && (fp->f_flag & O_APPEND)) ioflag |= IO_APPEND; if (fp->f_flag & FNONBLOCK) ioflag |= IO_NDELAY; if (fp->f_flag & FFSYNC || (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) ioflag |= IO_SYNC; else if (fp->f_flag & FDSYNC) ioflag |= IO_DSYNC; if (fp->f_flag & FALTIO) ioflag |= IO_ALTSEMANTICS; mp = NULL; if (vp->v_type != VCHR && (error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) return (error); VOP_LEASE(vp, l, cred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); uio->uio_offset = *offset; count = uio->uio_resid; error = VOP_WRITE(vp, uio, ioflag, cred); if (flags & FOF_UPDATE_OFFSET) { if (ioflag & IO_APPEND) *offset = uio->uio_offset; else *offset += count - uio->uio_resid; } VOP_UNLOCK(vp, 0); vn_finished_write(mp, 0); return (error); } /* * File table vnode stat routine. */ static int vn_statfile(struct file *fp, struct stat *sb, struct lwp *l) { struct vnode *vp = (struct vnode *)fp->f_data; return vn_stat(vp, sb, l); } int vn_stat(struct vnode *vp, struct stat *sb, struct lwp *l) { struct vattr va; int error; mode_t mode; error = VOP_GETATTR(vp, &va, l->l_proc->p_ucred, l); if (error) return (error); /* * Copy from vattr table */ sb->st_dev = va.va_fsid; sb->st_ino = va.va_fileid; mode = va.va_mode; switch (vp->v_type) { case VREG: mode |= S_IFREG; break; case VDIR: mode |= S_IFDIR; break; case VBLK: mode |= S_IFBLK; break; case VCHR: mode |= S_IFCHR; break; case VLNK: mode |= S_IFLNK; break; case VSOCK: mode |= S_IFSOCK; break; case VFIFO: mode |= S_IFIFO; break; default: return (EBADF); }; sb->st_mode = mode; sb->st_nlink = va.va_nlink; sb->st_uid = va.va_uid; sb->st_gid = va.va_gid; sb->st_rdev = va.va_rdev; sb->st_size = va.va_size; sb->st_atimespec = va.va_atime; sb->st_mtimespec = va.va_mtime; sb->st_ctimespec = va.va_ctime; sb->st_birthtimespec = va.va_birthtime; sb->st_blksize = va.va_blocksize; sb->st_flags = va.va_flags; sb->st_gen = 0; sb->st_blocks = va.va_bytes / S_BLKSIZE; return (0); } /* * File table vnode fcntl routine. */ static int vn_fcntl(struct file *fp, u_int com, void *data, struct lwp *l) { struct vnode *vp = ((struct vnode *)fp->f_data); int error; error = VOP_FCNTL(vp, com, data, fp->f_flag, l->l_proc->p_ucred, l); return (error); } /* * File table vnode ioctl routine. */ static int vn_ioctl(struct file *fp, u_long com, void *data, struct lwp *l) { struct vnode *vp = ((struct vnode *)fp->f_data); struct proc *p = l->l_proc; struct vattr vattr; int error; switch (vp->v_type) { case VREG: case VDIR: if (com == FIONREAD) { error = VOP_GETATTR(vp, &vattr, l->l_proc->p_ucred, l); if (error) return (error); *(int *)data = vattr.va_size - fp->f_offset; return (0); } if ((com == FIONWRITE) || (com == FIONSPACE)) { /* * Files don't have send queues, so there never * are any bytes in them, nor is there any * open space in them. */ *(int *)data = 0; return (0); } if (com == FIOGETBMAP) { daddr_t *block; if (*(daddr_t *)data < 0) return (EINVAL); block = (daddr_t *)data; return (VOP_BMAP(vp, *block, NULL, block, NULL)); } if (com == OFIOGETBMAP) { daddr_t ibn, obn; if (*(int32_t *)data < 0) return (EINVAL); ibn = (daddr_t)*(int32_t *)data; error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); *(int32_t *)data = (int32_t)obn; return error; } if (com == FIONBIO || com == FIOASYNC) /* XXX */ return (0); /* XXX */ /* fall into ... */ case VFIFO: case VCHR: case VBLK: error = VOP_IOCTL(vp, com, data, fp->f_flag, l->l_proc->p_ucred, l); if (error == 0 && com == TIOCSCTTY) { if (p->p_session->s_ttyvp) vrele(p->p_session->s_ttyvp); p->p_session->s_ttyvp = vp; VREF(vp); } return (error); default: return (EPASSTHROUGH); } } /* * File table vnode poll routine. */ static int vn_poll(struct file *fp, int events, struct lwp *l) { return (VOP_POLL(((struct vnode *)fp->f_data), events, l)); } /* * File table vnode kqfilter routine. */ int vn_kqfilter(struct file *fp, struct knote *kn) { return (VOP_KQFILTER((struct vnode *)fp->f_data, kn)); } /* * Check that the vnode is still valid, and if so * acquire requested lock. */ int vn_lock(struct vnode *vp, int flags) { int error; #if 0 KASSERT(vp->v_usecount > 0 || (flags & LK_INTERLOCK) != 0 || (vp->v_flag & VONWORKLST) != 0); #endif KASSERT((flags & ~(LK_INTERLOCK|LK_SHARED|LK_EXCLUSIVE|LK_DRAIN|LK_NOWAIT|LK_RETRY| LK_SETRECURSE|LK_CANRECURSE)) == 0); do { if ((flags & LK_INTERLOCK) == 0) simple_lock(&vp->v_interlock); if (vp->v_flag & VXLOCK) { if (flags & LK_NOWAIT) { simple_unlock(&vp->v_interlock); return EBUSY; } vp->v_flag |= VXWANT; ltsleep(vp, PINOD | PNORELOCK, "vn_lock", 0, &vp->v_interlock); error = ENOENT; } else { error = VOP_LOCK(vp, (flags & ~LK_RETRY) | LK_INTERLOCK); if (error == 0 || error == EDEADLK || error == EBUSY) return (error); } flags &= ~LK_INTERLOCK; } while (flags & LK_RETRY); return (error); } /* * File table vnode close routine. */ static int vn_closefile(struct file *fp, struct lwp *l) { return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, fp->f_cred, l)); } /* * Enable LK_CANRECURSE on lock. Return prior status. */ u_int vn_setrecurse(struct vnode *vp) { struct lock *lkp = &vp->v_lock; u_int retval = lkp->lk_flags & LK_CANRECURSE; lkp->lk_flags |= LK_CANRECURSE; return retval; } /* * Called when done with locksetrecurse. */ void vn_restorerecurse(struct vnode *vp, u_int flags) { struct lock *lkp = &vp->v_lock; lkp->lk_flags &= ~LK_CANRECURSE; lkp->lk_flags |= flags; } int vn_cow_establish(struct vnode *vp, int (*func)(void *, struct buf *), void *cookie) { int s; struct spec_cow_entry *e; MALLOC(e, struct spec_cow_entry *, sizeof(struct spec_cow_entry), M_DEVBUF, M_WAITOK); e->ce_func = func; e->ce_cookie = cookie; SPEC_COW_LOCK(vp->v_specinfo, s); vp->v_spec_cow_req++; while (vp->v_spec_cow_count > 0) ltsleep(&vp->v_spec_cow_req, PRIBIO, "cowlist", 0, &vp->v_spec_cow_slock); SLIST_INSERT_HEAD(&vp->v_spec_cow_head, e, ce_list); vp->v_spec_cow_req--; if (vp->v_spec_cow_req == 0) wakeup(&vp->v_spec_cow_req); SPEC_COW_UNLOCK(vp->v_specinfo, s); return 0; } int vn_cow_disestablish(struct vnode *vp, int (*func)(void *, struct buf *), void *cookie) { int s; struct spec_cow_entry *e; SPEC_COW_LOCK(vp->v_specinfo, s); vp->v_spec_cow_req++; while (vp->v_spec_cow_count > 0) ltsleep(&vp->v_spec_cow_req, PRIBIO, "cowlist", 0, &vp->v_spec_cow_slock); SLIST_FOREACH(e, &vp->v_spec_cow_head, ce_list) if (e->ce_func == func && e->ce_cookie == cookie) { SLIST_REMOVE(&vp->v_spec_cow_head, e, spec_cow_entry, ce_list); FREE(e, M_DEVBUF); break; } vp->v_spec_cow_req--; if (vp->v_spec_cow_req == 0) wakeup(&vp->v_spec_cow_req); SPEC_COW_UNLOCK(vp->v_specinfo, s); return e ? 0 : EINVAL; } /* * Simplified in-kernel wrapper calls for extended attribute access. * Both calls pass in a NULL credential, authorizing a "kernel" access. * Set IO_NODELOCKED in ioflg if the vnode is already locked. */ int vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, const char *attrname, size_t *buflen, void *bf, struct lwp *l) { struct uio auio; struct iovec aiov; int error; aiov.iov_len = *buflen; aiov.iov_base = bf; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_offset = 0; auio.uio_resid = *buflen; UIO_SETUP_SYSSPACE(&auio); if ((ioflg & IO_NODELOCKED) == 0) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL, l); if ((ioflg & IO_NODELOCKED) == 0) VOP_UNLOCK(vp, 0); if (error == 0) *buflen = *buflen - auio.uio_resid; return (error); } /* * XXX Failure mode if partially written? */ int vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, const char *attrname, size_t buflen, const void *bf, struct lwp *l) { struct uio auio; struct iovec aiov; struct mount *mp = NULL; /* XXX: GCC */ int error; aiov.iov_len = buflen; aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_WRITE; auio.uio_offset = 0; auio.uio_resid = buflen; UIO_SETUP_SYSSPACE(&auio); if ((ioflg & IO_NODELOCKED) == 0) { if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); } error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, l); if ((ioflg & IO_NODELOCKED) == 0) { vn_finished_write(mp, 0); VOP_UNLOCK(vp, 0); } return (error); } int vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, const char *attrname, struct lwp *l) { struct mount *mp = NULL; /* XXX: GCC */ int error; if ((ioflg & IO_NODELOCKED) == 0) { if ((error = vn_start_write(vp, &mp, V_WAIT)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); } error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL, l); if (error == EOPNOTSUPP) error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, NULL, l); if ((ioflg & IO_NODELOCKED) == 0) { vn_finished_write(mp, 0); VOP_UNLOCK(vp, 0); } return (error); } /* * Preparing to start a filesystem write operation. If the operation is * permitted, then we bump the count of operations in progress and * proceed. If a suspend request is in progress, we wait until the * suspension is over, and then proceed. * V_PCATCH adds PCATCH to the tsleep flags. * V_WAIT waits until suspension is over. Otherwise returns EWOULDBLOCK. * V_SLEEPONLY wait, but do not bump the operations count. * V_LOWER this is a lower level operation. No further vnodes should be * locked. Otherwise it is a upper level operation. No vnodes * should be locked. */ int vn_start_write(struct vnode *vp, struct mount **mpp, int flags) { struct mount *mp; int error, mask, prio; /* * If a vnode is provided, get and return the mount point that * to which it will write. */ if (vp != NULL) { *mpp = vp->v_mount; } if ((mp = *mpp) == NULL) return (0); mp = mp->mnt_leaf; /* * Check on status of suspension. */ prio = PUSER - 1; if (flags & V_PCATCH) prio |= PCATCH; if ((flags & V_LOWER) == 0) mask = IMNT_SUSPEND; else mask = IMNT_SUSPENDLOW; while ((mp->mnt_iflag & mask) != 0) { if ((flags & V_WAIT) == 0) return (EWOULDBLOCK); error = tsleep(&mp->mnt_flag, prio, "suspfs", 0); if (error) return (error); } if (flags & V_SLEEPONLY) return (0); simple_lock(&mp->mnt_slock); if ((flags & V_LOWER) == 0) mp->mnt_writeopcountupper++; else mp->mnt_writeopcountlower++; simple_unlock(&mp->mnt_slock); return (0); } /* * Filesystem write operation has completed. If we are suspending and this * operation is the last one, notify the suspender that the suspension is * now in effect. */ void vn_finished_write(struct mount *mp, int flags) { if (mp == NULL) return; mp = mp->mnt_leaf; simple_lock(&mp->mnt_slock); if ((flags & V_LOWER) == 0) { mp->mnt_writeopcountupper--; if (mp->mnt_writeopcountupper < 0) printf("vn_finished_write: neg cnt upper=%d\n", mp->mnt_writeopcountupper); if ((mp->mnt_iflag & IMNT_SUSPEND) != 0 && mp->mnt_writeopcountupper <= 0) wakeup(&mp->mnt_writeopcountupper); } else { mp->mnt_writeopcountlower--; if (mp->mnt_writeopcountlower < 0) printf("vn_finished_write: neg cnt lower=%d\n", mp->mnt_writeopcountlower); if ((mp->mnt_iflag & IMNT_SUSPENDLOW) != 0 && mp->mnt_writeopcountupper <= 0) wakeup(&mp->mnt_writeopcountlower); } simple_unlock(&mp->mnt_slock); } void vn_ra_allocctx(struct vnode *vp) { struct uvm_ractx *ra = NULL; if (vp->v_type != VREG) { return; } if (vp->v_ractx != NULL) { return; } simple_lock(&vp->v_interlock); if (vp->v_ractx == NULL) { simple_unlock(&vp->v_interlock); ra = uvm_ra_allocctx(); simple_lock(&vp->v_interlock); if (ra != NULL && vp->v_ractx == NULL) { vp->v_ractx = ra; ra = NULL; } } simple_unlock(&vp->v_interlock); if (ra != NULL) { uvm_ra_freectx(ra); } }