8a36da99de
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 1994 John S. Dyson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. Modifications may be freely made to this file if the above conditions
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* are met.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/uio.h>
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#include <geom/geom.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_map.h>
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int
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physio(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct cdevsw *csw;
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struct buf *pbuf;
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struct bio *bp;
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struct vm_page **pages;
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caddr_t sa;
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u_int iolen, poff;
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int error, i, npages, maxpages;
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vm_prot_t prot;
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csw = dev->si_devsw;
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/* check if character device is being destroyed */
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if (csw == NULL)
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return (ENXIO);
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/* XXX: sanity check */
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if(dev->si_iosize_max < PAGE_SIZE) {
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printf("WARNING: %s si_iosize_max=%d, using DFLTPHYS.\n",
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devtoname(dev), dev->si_iosize_max);
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dev->si_iosize_max = DFLTPHYS;
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}
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/*
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* If the driver does not want I/O to be split, that means that we
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* need to reject any requests that will not fit into one buffer.
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*/
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if (dev->si_flags & SI_NOSPLIT &&
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(uio->uio_resid > dev->si_iosize_max || uio->uio_resid > MAXPHYS ||
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uio->uio_iovcnt > 1)) {
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/*
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* Tell the user why his I/O was rejected.
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*/
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if (uio->uio_resid > dev->si_iosize_max)
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uprintf("%s: request size=%zd > si_iosize_max=%d; "
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"cannot split request\n", devtoname(dev),
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uio->uio_resid, dev->si_iosize_max);
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if (uio->uio_resid > MAXPHYS)
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uprintf("%s: request size=%zd > MAXPHYS=%d; "
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"cannot split request\n", devtoname(dev),
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uio->uio_resid, MAXPHYS);
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if (uio->uio_iovcnt > 1)
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uprintf("%s: request vectors=%d > 1; "
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"cannot split request\n", devtoname(dev),
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uio->uio_iovcnt);
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return (EFBIG);
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}
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/*
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* Keep the process UPAGES from being swapped. Processes swapped
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* out while holding pbufs, used by swapper, may lead to deadlock.
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*/
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PHOLD(curproc);
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bp = g_alloc_bio();
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if (uio->uio_segflg != UIO_USERSPACE) {
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pbuf = NULL;
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pages = NULL;
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} else if ((dev->si_flags & SI_UNMAPPED) && unmapped_buf_allowed) {
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pbuf = NULL;
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maxpages = btoc(MIN(uio->uio_resid, MAXPHYS)) + 1;
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pages = malloc(sizeof(*pages) * maxpages, M_DEVBUF, M_WAITOK);
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} else {
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pbuf = getpbuf(NULL);
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sa = pbuf->b_data;
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maxpages = btoc(MAXPHYS);
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pages = pbuf->b_pages;
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}
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prot = VM_PROT_READ;
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if (uio->uio_rw == UIO_READ)
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prot |= VM_PROT_WRITE; /* Less backwards than it looks */
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error = 0;
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for (i = 0; i < uio->uio_iovcnt; i++) {
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#ifdef RACCT
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if (racct_enable) {
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PROC_LOCK(curproc);
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if (uio->uio_rw == UIO_READ) {
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racct_add_force(curproc, RACCT_READBPS,
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uio->uio_iov[i].iov_len);
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racct_add_force(curproc, RACCT_READIOPS, 1);
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} else {
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racct_add_force(curproc, RACCT_WRITEBPS,
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uio->uio_iov[i].iov_len);
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racct_add_force(curproc, RACCT_WRITEIOPS, 1);
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}
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PROC_UNLOCK(curproc);
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}
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#endif /* RACCT */
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while (uio->uio_iov[i].iov_len) {
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g_reset_bio(bp);
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if (uio->uio_rw == UIO_READ) {
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bp->bio_cmd = BIO_READ;
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curthread->td_ru.ru_inblock++;
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} else {
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bp->bio_cmd = BIO_WRITE;
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curthread->td_ru.ru_oublock++;
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}
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bp->bio_offset = uio->uio_offset;
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bp->bio_data = uio->uio_iov[i].iov_base;
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bp->bio_length = uio->uio_iov[i].iov_len;
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if (bp->bio_length > dev->si_iosize_max)
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bp->bio_length = dev->si_iosize_max;
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if (bp->bio_length > MAXPHYS)
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bp->bio_length = MAXPHYS;
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/*
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* Make sure the pbuf can map the request.
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* The pbuf has kvasize = MAXPHYS, so a request
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* larger than MAXPHYS - PAGE_SIZE must be
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* page aligned or it will be fragmented.
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*/
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poff = (vm_offset_t)bp->bio_data & PAGE_MASK;
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if (pbuf && bp->bio_length + poff > pbuf->b_kvasize) {
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if (dev->si_flags & SI_NOSPLIT) {
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uprintf("%s: request ptr %p is not "
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"on a page boundary; cannot split "
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"request\n", devtoname(dev),
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bp->bio_data);
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error = EFBIG;
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goto doerror;
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}
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bp->bio_length = pbuf->b_kvasize;
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if (poff != 0)
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bp->bio_length -= PAGE_SIZE;
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}
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bp->bio_bcount = bp->bio_length;
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bp->bio_dev = dev;
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if (pages) {
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if ((npages = vm_fault_quick_hold_pages(
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&curproc->p_vmspace->vm_map,
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(vm_offset_t)bp->bio_data, bp->bio_length,
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prot, pages, maxpages)) < 0) {
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error = EFAULT;
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goto doerror;
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}
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if (pbuf) {
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pmap_qenter((vm_offset_t)sa,
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pages, npages);
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bp->bio_data = sa + poff;
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} else {
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bp->bio_ma = pages;
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bp->bio_ma_n = npages;
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bp->bio_ma_offset = poff;
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bp->bio_data = unmapped_buf;
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bp->bio_flags |= BIO_UNMAPPED;
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}
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}
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csw->d_strategy(bp);
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if (uio->uio_rw == UIO_READ)
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biowait(bp, "physrd");
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else
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biowait(bp, "physwr");
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if (pages) {
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if (pbuf)
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pmap_qremove((vm_offset_t)sa, npages);
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vm_page_unhold_pages(pages, npages);
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}
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iolen = bp->bio_length - bp->bio_resid;
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if (iolen == 0 && !(bp->bio_flags & BIO_ERROR))
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goto doerror; /* EOF */
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uio->uio_iov[i].iov_len -= iolen;
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uio->uio_iov[i].iov_base =
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(char *)uio->uio_iov[i].iov_base + iolen;
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uio->uio_resid -= iolen;
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uio->uio_offset += iolen;
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if (bp->bio_flags & BIO_ERROR) {
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error = bp->bio_error;
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goto doerror;
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}
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}
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}
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doerror:
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if (pbuf)
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relpbuf(pbuf, NULL);
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else if (pages)
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free(pages, M_DEVBUF);
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g_destroy_bio(bp);
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PRELE(curproc);
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return (error);
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}
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