/* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 8.2 (Berkeley) 1/21/94 * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int vn_closefile __P((struct file *fp, struct proc *p)); static int vn_ioctl __P((struct file *fp, u_long com, caddr_t data, struct proc *p)); static int vn_read __P((struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p)); static int vn_poll __P((struct file *fp, int events, struct ucred *cred, struct proc *p)); static int vn_statfile __P((struct file *fp, struct stat *sb, struct proc *p)); static int vn_write __P((struct file *fp, struct uio *uio, struct ucred *cred, int flags, struct proc *p)); struct fileops vnops = { vn_read, vn_write, vn_ioctl, vn_poll, vn_statfile, vn_closefile }; static int filt_nullattach(struct knote *kn); static int filt_vnattach(struct knote *kn); static void filt_vndetach(struct knote *kn); static int filt_vnode(struct knote *kn, long hint); static int filt_vnread(struct knote *kn, long hint); struct filterops vn_filtops = { 1, filt_vnattach, filt_vndetach, filt_vnode }; /* * XXX * filt_vnread is ufs-specific, so the attach routine should really * switch out to different filterops based on the vn filetype */ struct filterops vn_rwfiltops[] = { { 1, filt_vnattach, filt_vndetach, filt_vnread }, { 1, filt_nullattach, NULL, NULL }, }; /* * Common code for vnode open operations. * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. * * Note that this does NOT free nameidata for the successful case, * due to the NDINIT being done elsewhere. */ int vn_open(ndp, flagp, cmode) register struct nameidata *ndp; int *flagp, cmode; { struct vnode *vp; struct mount *mp; struct proc *p = ndp->ni_cnd.cn_proc; struct ucred *cred = p->p_ucred; struct vattr vat; struct vattr *vap = &vat; int mode, fmode, error; restart: fmode = *flagp; 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; bwillwrite(); if ((error = namei(ndp)) != 0) return (error); if (ndp->ni_vp == NULL) { VATTR_NULL(vap); vap->va_type = VREG; vap->va_mode = cmode; if (fmode & O_EXCL) vap->va_vaflags |= VA_EXCLUSIVE; if (vn_start_write(ndp->ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(ndp, NDF_ONLY_PNBUF); vput(ndp->ni_dvp); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE); error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd, vap); vput(ndp->ni_dvp); vn_finished_write(mp); if (error) { NDFREE(ndp, NDF_ONLY_PNBUF); return (error); } ASSERT_VOP_UNLOCKED(ndp->ni_dvp, "create"); ASSERT_VOP_LOCKED(ndp->ni_vp, "create"); fmode &= ~O_TRUNC; vp = ndp->ni_vp; } else { 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 = ((fmode & O_NOFOLLOW) ? NOFOLLOW : FOLLOW) | LOCKLEAF; if ((error = namei(ndp)) != 0) return (error); vp = ndp->ni_vp; } if (vp->v_type == VLNK) { error = EMLINK; goto bad; } if (vp->v_type == VSOCK) { error = EOPNOTSUPP; goto bad; } if ((fmode & O_CREAT) == 0) { mode = 0; if (fmode & (FWRITE | O_TRUNC)) { if (vp->v_type == VDIR) { error = EISDIR; goto bad; } error = vn_writechk(vp); if (error) goto bad; mode |= VWRITE; } if (fmode & FREAD) mode |= VREAD; if (mode) { error = VOP_ACCESS(vp, mode, cred, p); if (error) goto bad; } } if ((error = VOP_OPEN(vp, fmode, cred, p)) != 0) goto bad; /* * Make sure that a VM object is created for VMIO support. */ if (vn_canvmio(vp) == TRUE) { if ((error = vfs_object_create(vp, p, cred)) != 0) goto bad; } if (fmode & FWRITE) vp->v_writecount++; *flagp = fmode; return (0); bad: NDFREE(ndp, NDF_ONLY_PNBUF); vput(vp); *flagp = fmode; return (error); } /* * Check for write permissions on the specified vnode. * Prototype text segments cannot be written. */ int vn_writechk(vp) register struct vnode *vp; { /* * If there's shared text associated with * the vnode, try to free it up once. If * we fail, we can't allow writing. */ if (vp->v_flag & VTEXT) return (ETXTBSY); return (0); } /* * Vnode close call */ int vn_close(vp, flags, cred, p) register struct vnode *vp; int flags; struct ucred *cred; struct proc *p; { int error; if (flags & FWRITE) vp->v_writecount--; error = VOP_CLOSE(vp, flags, cred, p); vrele(vp); return (error); } static __inline int sequential_heuristic(struct uio *uio, struct file *fp) { /* * Sequential heuristic - detect sequential operation */ if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || uio->uio_offset == fp->f_nextoff) { /* * XXX we assume that the filesystem block size is * the default. Not true, but still gives us a pretty * good indicator of how sequential the read operations * are. */ fp->f_seqcount += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE; if (fp->f_seqcount >= 127) fp->f_seqcount = 127; return(fp->f_seqcount << 16); } /* * Not sequential, quick draw-down of seqcount */ if (fp->f_seqcount > 1) fp->f_seqcount = 1; else fp->f_seqcount = 0; return(0); } /* * Package up an I/O request on a vnode into a uio and do it. */ int vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, cred, aresid, p) enum uio_rw rw; struct vnode *vp; caddr_t base; int len; off_t offset; enum uio_seg segflg; int ioflg; struct ucred *cred; int *aresid; struct proc *p; { struct uio auio; struct iovec aiov; struct mount *mp; int error; if ((ioflg & IO_NODELOCKED) == 0) { mp = NULL; if (rw == UIO_WRITE && vp->v_type != VCHR && vp->v_type != VBLK && (error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); } 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_segflg = segflg; auio.uio_rw = rw; auio.uio_procp = p; 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) { vn_finished_write(mp); VOP_UNLOCK(vp, 0, p); } return (error); } /* * File table vnode read routine. */ static int vn_read(fp, uio, cred, flags, p) struct file *fp; struct uio *uio; struct ucred *cred; struct proc *p; int flags; { struct vnode *vp; int error, ioflag; KASSERT(uio->uio_procp == p, ("uio_procp %p is not p %p", uio->uio_procp, p)); vp = (struct vnode *)fp->f_data; ioflag = 0; if (fp->f_flag & FNONBLOCK) ioflag |= IO_NDELAY; VOP_LEASE(vp, p, cred, LEASE_READ); vn_lock(vp, LK_SHARED | LK_NOPAUSE | LK_RETRY, p); if ((flags & FOF_OFFSET) == 0) uio->uio_offset = fp->f_offset; ioflag |= sequential_heuristic(uio, fp); error = VOP_READ(vp, uio, ioflag, cred); if ((flags & FOF_OFFSET) == 0) fp->f_offset = uio->uio_offset; fp->f_nextoff = uio->uio_offset; VOP_UNLOCK(vp, 0, p); return (error); } /* * File table vnode write routine. */ static int vn_write(fp, uio, cred, flags, p) struct file *fp; struct uio *uio; struct ucred *cred; struct proc *p; int flags; { struct vnode *vp; struct mount *mp; int error, ioflag; KASSERT(uio->uio_procp == p, ("uio_procp %p is not p %p", uio->uio_procp, p)); vp = (struct vnode *)fp->f_data; if (vp->v_type == VREG) bwillwrite(); vp = (struct vnode *)fp->f_data; /* XXX needed? */ ioflag = IO_UNIT; 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 & O_FSYNC) || (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) ioflag |= IO_SYNC; mp = NULL; if (vp->v_type != VCHR && vp->v_type != VBLK && (error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) return (error); VOP_LEASE(vp, p, cred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); if ((flags & FOF_OFFSET) == 0) uio->uio_offset = fp->f_offset; ioflag |= sequential_heuristic(uio, fp); error = VOP_WRITE(vp, uio, ioflag, cred); if ((flags & FOF_OFFSET) == 0) fp->f_offset = uio->uio_offset; fp->f_nextoff = uio->uio_offset; VOP_UNLOCK(vp, 0, p); vn_finished_write(mp); return (error); } /* * File table vnode stat routine. */ static int vn_statfile(fp, sb, p) struct file *fp; struct stat *sb; struct proc *p; { struct vnode *vp = (struct vnode *)fp->f_data; return vn_stat(vp, sb, p); } int vn_stat(vp, sb, p) struct vnode *vp; register struct stat *sb; struct proc *p; { struct vattr vattr; register struct vattr *vap; int error; u_short mode; vap = &vattr; error = VOP_GETATTR(vp, vap, p->p_ucred, p); if (error) return (error); /* * Zero the spare stat fields */ sb->st_lspare = 0; sb->st_qspare[0] = 0; sb->st_qspare[1] = 0; /* * Copy from vattr table */ if (vap->va_fsid != VNOVAL) sb->st_dev = vap->va_fsid; else sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; sb->st_ino = vap->va_fileid; mode = vap->va_mode; switch (vap->va_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; /* This is a cosmetic change, symlinks do not have a mode. */ if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW) sb->st_mode &= ~ACCESSPERMS; /* 0000 */ else sb->st_mode |= ACCESSPERMS; /* 0777 */ break; case VSOCK: mode |= S_IFSOCK; break; case VFIFO: mode |= S_IFIFO; break; default: return (EBADF); }; sb->st_mode = mode; sb->st_nlink = vap->va_nlink; sb->st_uid = vap->va_uid; sb->st_gid = vap->va_gid; sb->st_rdev = vap->va_rdev; sb->st_size = vap->va_size; sb->st_atimespec = vap->va_atime; sb->st_mtimespec = vap->va_mtime; sb->st_ctimespec = vap->va_ctime; /* * According to www.opengroup.org, the meaning of st_blksize is * "a filesystem-specific preferred I/O block size for this * object. In some filesystem types, this may vary from file * to file" * Default to zero to catch bogus uses of this field. */ if (vap->va_type == VREG) { sb->st_blksize = vap->va_blocksize; } else if (vn_isdisk(vp, NULL)) { sb->st_blksize = vp->v_rdev->si_bsize_best; if (sb->st_blksize < vp->v_rdev->si_bsize_phys) sb->st_blksize = vp->v_rdev->si_bsize_phys; if (sb->st_blksize < BLKDEV_IOSIZE) sb->st_blksize = BLKDEV_IOSIZE; } else { sb->st_blksize = 0; } sb->st_flags = vap->va_flags; if (suser_xxx(p->p_ucred, 0, 0)) sb->st_gen = 0; else sb->st_gen = vap->va_gen; #if (S_BLKSIZE == 512) /* Optimize this case */ sb->st_blocks = vap->va_bytes >> 9; #else sb->st_blocks = vap->va_bytes / S_BLKSIZE; #endif return (0); } /* * File table vnode ioctl routine. */ static int vn_ioctl(fp, com, data, p) struct file *fp; u_long com; caddr_t data; struct proc *p; { register struct vnode *vp = ((struct vnode *)fp->f_data); struct vattr vattr; int error; switch (vp->v_type) { case VREG: case VDIR: if (com == FIONREAD) { error = VOP_GETATTR(vp, &vattr, p->p_ucred, p); if (error) return (error); *(int *)data = vattr.va_size - fp->f_offset; return (0); } if (com == FIONBIO || com == FIOASYNC) /* XXX */ return (0); /* XXX */ /* fall into ... */ default: #if 0 return (ENOTTY); #endif case VFIFO: case VCHR: case VBLK: if (com == FIODTYPE) { if (vp->v_type != VCHR && vp->v_type != VBLK) return (ENOTTY); *(int *)data = devsw(vp->v_rdev)->d_flags & D_TYPEMASK; return (0); } error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p); if (error == 0 && com == TIOCSCTTY) { /* Do nothing if reassigning same control tty */ if (p->p_session->s_ttyvp == vp) return (0); /* Get rid of reference to old control tty */ if (p->p_session->s_ttyvp) vrele(p->p_session->s_ttyvp); p->p_session->s_ttyvp = vp; VREF(vp); } return (error); } } /* * File table vnode poll routine. */ static int vn_poll(fp, events, cred, p) struct file *fp; int events; struct ucred *cred; struct proc *p; { return (VOP_POLL(((struct vnode *)fp->f_data), events, cred, p)); } /* * Check that the vnode is still valid, and if so * acquire requested lock. */ int #ifndef DEBUG_LOCKS vn_lock(vp, flags, p) #else debug_vn_lock(vp, flags, p, filename, line) #endif struct vnode *vp; int flags; struct proc *p; #ifdef DEBUG_LOCKS const char *filename; int line; #endif { int error; do { if ((flags & LK_INTERLOCK) == 0) simple_lock(&vp->v_interlock); if (vp->v_flag & VXLOCK) { vp->v_flag |= VXWANT; simple_unlock(&vp->v_interlock); tsleep((caddr_t)vp, PINOD, "vn_lock", 0); error = ENOENT; } else { #ifdef DEBUG_LOCKS vp->filename = filename; vp->line = line; #endif error = VOP_LOCK(vp, flags | LK_NOPAUSE | LK_INTERLOCK, p); if (error == 0) return (error); } flags &= ~LK_INTERLOCK; } while (flags & LK_RETRY); return (error); } /* * File table vnode close routine. */ static int vn_closefile(fp, p) struct file *fp; struct proc *p; { fp->f_ops = &badfileops; return (vn_close(((struct vnode *)fp->f_data), fp->f_flag, fp->f_cred, p)); } /* * 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. */ int vn_start_write(vp, mpp, flags) struct vnode *vp; struct mount **mpp; int flags; { struct mount *mp; int error; /* * If a vnode is provided, get and return the mount point that * to which it will write. */ if (vp != NULL) { if ((error = VOP_GETWRITEMOUNT(vp, mpp)) != 0) { *mpp = NULL; if (error != EOPNOTSUPP) return (error); return (0); } } if ((mp = *mpp) == NULL) return (0); /* * Check on status of suspension. */ while ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0) { if (flags & V_NOWAIT) return (EWOULDBLOCK); error = tsleep(&mp->mnt_flag, (PUSER - 1) | (flags & PCATCH), "suspfs", 0); if (error) return (error); } if (flags & V_XSLEEP) return (0); mp->mnt_writeopcount++; return (0); } /* * Secondary suspension. Used by operations such as vop_inactive * routines that are needed by the higher level functions. These * are allowed to proceed until all the higher level functions have * completed (indicated by mnt_writeopcount dropping to zero). At that * time, these operations are halted until the suspension is over. */ int vn_write_suspend_wait(vp, mp, flags) struct vnode *vp; struct mount *mp; int flags; { int error; if (vp != NULL) { if ((error = VOP_GETWRITEMOUNT(vp, &mp)) != 0) { if (error != EOPNOTSUPP) return (error); return (0); } } /* * If we are not suspended or have not yet reached suspended * mode, then let the operation proceed. */ if (mp == NULL || (mp->mnt_kern_flag & MNTK_SUSPENDED) == 0) return (0); if (flags & V_NOWAIT) return (EWOULDBLOCK); /* * Wait for the suspension to finish. */ return (tsleep(&mp->mnt_flag, (PUSER - 1) | (flags & PCATCH), "suspfs", 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(mp) struct mount *mp; { if (mp == NULL) return; mp->mnt_writeopcount--; if (mp->mnt_writeopcount < 0) panic("vn_finished_write: neg cnt"); if ((mp->mnt_kern_flag & MNTK_SUSPEND) != 0 && mp->mnt_writeopcount <= 0) wakeup(&mp->mnt_writeopcount); } /* * Request a filesystem to suspend write operations. */ void vfs_write_suspend(mp) struct mount *mp; { struct proc *p = curproc; if (mp->mnt_kern_flag & MNTK_SUSPEND) return; mp->mnt_kern_flag |= MNTK_SUSPEND; if (mp->mnt_writeopcount > 0) (void) tsleep(&mp->mnt_writeopcount, PUSER - 1, "suspwt", 0); VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p); mp->mnt_kern_flag |= MNTK_SUSPENDED; } /* * Request a filesystem to resume write operations. */ void vfs_write_resume(mp) struct mount *mp; { if ((mp->mnt_kern_flag & MNTK_SUSPEND) == 0) return; mp->mnt_kern_flag &= ~(MNTK_SUSPEND | MNTK_SUSPENDED); wakeup(&mp->mnt_writeopcount); wakeup(&mp->mnt_flag); } static int filt_vnattach(struct knote *kn) { struct vnode *vp; if (kn->kn_fp->f_type != DTYPE_VNODE && kn->kn_fp->f_type != DTYPE_FIFO) return (EBADF); vp = (struct vnode *)kn->kn_fp->f_data; /* * XXX * this is a hack simply to cause the filter attach to fail * for non-ufs filesystems, until the support for them is done. */ if ((vp)->v_tag != VT_UFS) return (EOPNOTSUPP); simple_lock(&vp->v_pollinfo.vpi_lock); SLIST_INSERT_HEAD(&vp->v_pollinfo.vpi_selinfo.si_note, kn, kn_selnext); simple_unlock(&vp->v_pollinfo.vpi_lock); return (0); } static void filt_vndetach(struct knote *kn) { struct vnode *vp = (struct vnode *)kn->kn_fp->f_data; simple_lock(&vp->v_pollinfo.vpi_lock); SLIST_REMOVE(&vp->v_pollinfo.vpi_selinfo.si_note, kn, knote, kn_selnext); simple_unlock(&vp->v_pollinfo.vpi_lock); } static int filt_vnode(struct knote *kn, long hint) { if (kn->kn_sfflags & hint) kn->kn_fflags |= hint; return (kn->kn_fflags != 0); } static int filt_nullattach(struct knote *kn) { return (ENXIO); } /*ARGSUSED*/ static int filt_vnread(struct knote *kn, long hint) { struct vnode *vp = (struct vnode *)kn->kn_fp->f_data; struct inode *ip = VTOI(vp); kn->kn_data = ip->i_size - kn->kn_fp->f_offset; return (kn->kn_data != 0); } /* * Simplified in-kernel wrapper calls for extended attribute access. * Both calls pass in a NULL credential, authorizing as "kernel" access. * Set IO_NODELOCKED in ioflg if the vnode is already locked. */ int vn_extattr_get(struct vnode *vp, int ioflg, const char *attrname, int *buflen, char *buf, struct proc *p) { struct uio auio; struct iovec iov; int error; iov.iov_len = *buflen; iov.iov_base = buf; auio.uio_iov = &iov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_SYSSPACE; auio.uio_procp = p; auio.uio_offset = 0; auio.uio_resid = *buflen; if ((ioflg & IO_NODELOCKED) == 0) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* authorize attribute retrieval as kernel */ error = VOP_GETEXTATTR(vp, attrname, &auio, NULL, p); if ((ioflg & IO_NODELOCKED) == 0) VOP_UNLOCK(vp, 0, p); 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, const char *attrname, int buflen, char *buf, struct proc *p) { struct uio auio; struct iovec iov; int error; iov.iov_len = buflen; iov.iov_base = buf; auio.uio_iov = &iov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_WRITE; auio.uio_segflg = UIO_SYSSPACE; auio.uio_procp = p; auio.uio_offset = 0; auio.uio_resid = buflen; if ((ioflg & IO_NODELOCKED) == 0) vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* authorize attribute setting as kernel */ error = VOP_SETEXTATTR(vp, attrname, &auio, NULL, p); if ((ioflg & IO_NODELOCKED) == 0) VOP_UNLOCK(vp, 0, p); return (error); }