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md.c
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md.c
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/*-
* SPDX-License-Identifier: (Beerware AND BSD-3-Clause)
*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
*/
/*-
* The following functions are based on the vn(4) driver: mdstart_swap(),
* mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(),
* and as such under the following copyright:
*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2013 The FreeBSD Foundation
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Portions of this software were developed by Konstantin Belousov
* under sponsorship from the FreeBSD Foundation.
*
* 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.
*
* from: Utah Hdr: vn.c 1.13 94/04/02
* From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03
*/
#include "opt_rootdevname.h"
#include "opt_geom.h"
#include "opt_md.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/devicestat.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/limits.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mdioctl.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/rwlock.h>
#include <sys/sbuf.h>
#include <sys/sched.h>
#include <sys/sf_buf.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/disk.h>
#include <geom/geom.h>
#include <geom/geom_int.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_param.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <vm/swap_pager.h>
#include <vm/uma.h>
#include <machine/bus.h>
#define MD_MODVER 1
#define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */
#define MD_EXITING 0x20000 /* Worker thread is exiting. */
#define MD_PROVIDERGONE 0x40000 /* Safe to free the softc */
#ifndef MD_NSECT
#define MD_NSECT (10000 * 2)
#endif
struct md_req {
unsigned md_unit; /* unit number */
enum md_types md_type; /* type of disk */
off_t md_mediasize; /* size of disk in bytes */
unsigned md_sectorsize; /* sectorsize */
unsigned md_options; /* options */
int md_fwheads; /* firmware heads */
int md_fwsectors; /* firmware sectors */
char *md_file; /* pathname of file to mount */
enum uio_seg md_file_seg; /* location of md_file */
char *md_label; /* label of the device (userspace) */
int *md_units; /* pointer to units array (kernel) */
size_t md_units_nitems; /* items in md_units array */
};
#ifdef COMPAT_FREEBSD32
struct md_ioctl32 {
unsigned md_version;
unsigned md_unit;
enum md_types md_type;
uint32_t md_file;
off_t md_mediasize;
unsigned md_sectorsize;
unsigned md_options;
uint64_t md_base;
int md_fwheads;
int md_fwsectors;
uint32_t md_label;
int md_pad[MDNPAD];
}
#ifdef __amd64__
__attribute__((__packed__))
#endif
;
#ifndef __amd64__
CTASSERT((sizeof(struct md_ioctl32)) == 440);
#else
CTASSERT((sizeof(struct md_ioctl32)) == 436);
#endif
#define MDIOCATTACH_32 _IOC_NEWTYPE(MDIOCATTACH, struct md_ioctl32)
#define MDIOCDETACH_32 _IOC_NEWTYPE(MDIOCDETACH, struct md_ioctl32)
#define MDIOCQUERY_32 _IOC_NEWTYPE(MDIOCQUERY, struct md_ioctl32)
#define MDIOCRESIZE_32 _IOC_NEWTYPE(MDIOCRESIZE, struct md_ioctl32)
#endif /* COMPAT_FREEBSD32 */
static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk");
static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors");
static int md_debug;
SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0,
"Enable md(4) debug messages");
static int md_malloc_wait;
SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0,
"Allow malloc to wait for memory allocations");
#if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE)
#define MD_ROOT_FSTYPE "ufs"
#endif
#if defined(MD_ROOT)
/*
* Preloaded image gets put here.
*/
#if defined(MD_ROOT_SIZE)
/*
* We put the mfs_root symbol into the oldmfs section of the kernel object file.
* Applications that patch the object with the image can determine
* the size looking at the oldmfs section size within the kernel.
*/
u_char mfs_root[MD_ROOT_SIZE*1024] __attribute__ ((section ("oldmfs")));
const int mfs_root_size = sizeof(mfs_root);
#elif defined(MD_ROOT_MEM)
/* MD region already mapped in the memory */
u_char *mfs_root;
int mfs_root_size;
#else
extern volatile u_char __weak_symbol mfs_root;
extern volatile u_char __weak_symbol mfs_root_end;
#define mfs_root_size ((uintptr_t)(&mfs_root_end - &mfs_root))
#endif
#endif
static g_init_t g_md_init;
static g_fini_t g_md_fini;
static g_start_t g_md_start;
static g_access_t g_md_access;
static void g_md_dumpconf(struct sbuf *sb, const char *indent,
struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp);
static g_provgone_t g_md_providergone;
static struct cdev *status_dev = NULL;
static struct sx md_sx;
static struct unrhdr *md_uh;
static d_ioctl_t mdctlioctl;
static struct cdevsw mdctl_cdevsw = {
.d_version = D_VERSION,
.d_ioctl = mdctlioctl,
.d_name = MD_NAME,
};
struct g_class g_md_class = {
.name = "MD",
.version = G_VERSION,
.init = g_md_init,
.fini = g_md_fini,
.start = g_md_start,
.access = g_md_access,
.dumpconf = g_md_dumpconf,
.providergone = g_md_providergone,
};
DECLARE_GEOM_CLASS(g_md_class, g_md);
MODULE_VERSION(geom_md, 0);
static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list);
#define NINDIR (PAGE_SIZE / sizeof(uintptr_t))
#define NMASK (NINDIR-1)
static int nshift;
struct indir {
uintptr_t *array;
u_int total;
u_int used;
u_int shift;
};
struct md_s {
int unit;
LIST_ENTRY(md_s) list;
struct bio_queue_head bio_queue;
struct mtx queue_mtx;
struct cdev *dev;
enum md_types type;
off_t mediasize;
unsigned sectorsize;
unsigned opencount;
unsigned fwheads;
unsigned fwsectors;
char ident[32];
unsigned flags;
char name[20];
struct proc *procp;
struct g_geom *gp;
struct g_provider *pp;
int (*start)(struct md_s *sc, struct bio *bp);
struct devstat *devstat;
bool candelete;
/* MD_MALLOC related fields */
struct indir *indir;
uma_zone_t uma;
/* MD_PRELOAD related fields */
u_char *pl_ptr;
size_t pl_len;
/* MD_VNODE related fields */
struct vnode *vnode;
char file[PATH_MAX];
char label[PATH_MAX];
struct ucred *cred;
vm_offset_t kva;
/* MD_SWAP related fields */
vm_object_t object;
};
static struct indir *
new_indir(u_int shift)
{
struct indir *ip;
ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT)
| M_ZERO);
if (ip == NULL)
return (NULL);
ip->array = malloc(sizeof(uintptr_t) * NINDIR,
M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO);
if (ip->array == NULL) {
free(ip, M_MD);
return (NULL);
}
ip->total = NINDIR;
ip->shift = shift;
return (ip);
}
static void
del_indir(struct indir *ip)
{
free(ip->array, M_MDSECT);
free(ip, M_MD);
}
static void
destroy_indir(struct md_s *sc, struct indir *ip)
{
int i;
for (i = 0; i < NINDIR; i++) {
if (!ip->array[i])
continue;
if (ip->shift)
destroy_indir(sc, (struct indir*)(ip->array[i]));
else if (ip->array[i] > 255)
uma_zfree(sc->uma, (void *)(ip->array[i]));
}
del_indir(ip);
}
/*
* This function does the math and allocates the top level "indir" structure
* for a device of "size" sectors.
*/
static struct indir *
dimension(off_t size)
{
off_t rcnt;
struct indir *ip;
int layer;
rcnt = size;
layer = 0;
while (rcnt > NINDIR) {
rcnt /= NINDIR;
layer++;
}
/*
* XXX: the top layer is probably not fully populated, so we allocate
* too much space for ip->array in here.
*/
ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO);
ip->array = malloc(sizeof(uintptr_t) * NINDIR,
M_MDSECT, M_WAITOK | M_ZERO);
ip->total = NINDIR;
ip->shift = layer * nshift;
return (ip);
}
/*
* Read a given sector
*/
static uintptr_t
s_read(struct indir *ip, off_t offset)
{
struct indir *cip;
int idx;
uintptr_t up;
if (md_debug > 1)
printf("s_read(%jd)\n", (intmax_t)offset);
up = 0;
for (cip = ip; cip != NULL;) {
if (cip->shift) {
idx = (offset >> cip->shift) & NMASK;
up = cip->array[idx];
cip = (struct indir *)up;
continue;
}
idx = offset & NMASK;
return (cip->array[idx]);
}
return (0);
}
/*
* Write a given sector, prune the tree if the value is 0
*/
static int
s_write(struct indir *ip, off_t offset, uintptr_t ptr)
{
struct indir *cip, *lip[10];
int idx, li;
uintptr_t up;
if (md_debug > 1)
printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr);
up = 0;
li = 0;
cip = ip;
for (;;) {
lip[li++] = cip;
if (cip->shift) {
idx = (offset >> cip->shift) & NMASK;
up = cip->array[idx];
if (up != 0) {
cip = (struct indir *)up;
continue;
}
/* Allocate branch */
cip->array[idx] =
(uintptr_t)new_indir(cip->shift - nshift);
if (cip->array[idx] == 0)
return (ENOSPC);
cip->used++;
up = cip->array[idx];
cip = (struct indir *)up;
continue;
}
/* leafnode */
idx = offset & NMASK;
up = cip->array[idx];
if (up != 0)
cip->used--;
cip->array[idx] = ptr;
if (ptr != 0)
cip->used++;
break;
}
if (cip->used != 0 || li == 1)
return (0);
li--;
while (cip->used == 0 && cip != ip) {
li--;
idx = (offset >> lip[li]->shift) & NMASK;
up = lip[li]->array[idx];
KASSERT(up == (uintptr_t)cip, ("md screwed up"));
del_indir(cip);
lip[li]->array[idx] = 0;
lip[li]->used--;
cip = lip[li];
}
return (0);
}
static int
g_md_access(struct g_provider *pp, int r, int w, int e)
{
struct md_s *sc;
sc = pp->geom->softc;
if (sc == NULL) {
if (r <= 0 && w <= 0 && e <= 0)
return (0);
return (ENXIO);
}
r += pp->acr;
w += pp->acw;
e += pp->ace;
if ((sc->flags & MD_READONLY) != 0 && w > 0)
return (EROFS);
if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
sc->opencount = 1;
} else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
sc->opencount = 0;
}
return (0);
}
static void
g_md_start(struct bio *bp)
{
struct md_s *sc;
sc = bp->bio_to->geom->softc;
if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) {
devstat_start_transaction_bio(sc->devstat, bp);
}
mtx_lock(&sc->queue_mtx);
bioq_disksort(&sc->bio_queue, bp);
wakeup(sc);
mtx_unlock(&sc->queue_mtx);
}
#define MD_MALLOC_MOVE_ZERO 1
#define MD_MALLOC_MOVE_FILL 2
#define MD_MALLOC_MOVE_READ 3
#define MD_MALLOC_MOVE_WRITE 4
#define MD_MALLOC_MOVE_CMP 5
static int
md_malloc_move_ma(vm_page_t **mp, int *ma_offs, unsigned sectorsize,
void *ptr, u_char fill, int op)
{
struct sf_buf *sf;
vm_page_t m, *mp1;
char *p, first;
off_t *uc;
unsigned n;
int error, i, ma_offs1, sz, first_read;
m = NULL;
error = 0;
sf = NULL;
/* if (op == MD_MALLOC_MOVE_CMP) { gcc */
first = 0;
first_read = 0;
uc = ptr;
mp1 = *mp;
ma_offs1 = *ma_offs;
/* } */
sched_pin();
for (n = sectorsize; n != 0; n -= sz) {
sz = imin(PAGE_SIZE - *ma_offs, n);
if (m != **mp) {
if (sf != NULL)
sf_buf_free(sf);
m = **mp;
sf = sf_buf_alloc(m, SFB_CPUPRIVATE |
(md_malloc_wait ? 0 : SFB_NOWAIT));
if (sf == NULL) {
error = ENOMEM;
break;
}
}
p = (char *)sf_buf_kva(sf) + *ma_offs;
switch (op) {
case MD_MALLOC_MOVE_ZERO:
bzero(p, sz);
break;
case MD_MALLOC_MOVE_FILL:
memset(p, fill, sz);
break;
case MD_MALLOC_MOVE_READ:
bcopy(ptr, p, sz);
cpu_flush_dcache(p, sz);
break;
case MD_MALLOC_MOVE_WRITE:
bcopy(p, ptr, sz);
break;
case MD_MALLOC_MOVE_CMP:
for (i = 0; i < sz; i++, p++) {
if (!first_read) {
*uc = (u_char)*p;
first = *p;
first_read = 1;
} else if (*p != first) {
error = EDOOFUS;
break;
}
}
break;
default:
KASSERT(0, ("md_malloc_move_ma unknown op %d\n", op));
break;
}
if (error != 0)
break;
*ma_offs += sz;
*ma_offs %= PAGE_SIZE;
if (*ma_offs == 0)
(*mp)++;
ptr = (char *)ptr + sz;
}
if (sf != NULL)
sf_buf_free(sf);
sched_unpin();
if (op == MD_MALLOC_MOVE_CMP && error != 0) {
*mp = mp1;
*ma_offs = ma_offs1;
}
return (error);
}
static int
md_malloc_move_vlist(bus_dma_segment_t **pvlist, int *pma_offs,
unsigned len, void *ptr, u_char fill, int op)
{
bus_dma_segment_t *vlist;
uint8_t *p, *end, first;
off_t *uc;
int ma_offs, seg_len;
vlist = *pvlist;
ma_offs = *pma_offs;
uc = ptr;
for (; len != 0; len -= seg_len) {
seg_len = imin(vlist->ds_len - ma_offs, len);
p = (uint8_t *)(uintptr_t)vlist->ds_addr + ma_offs;
switch (op) {
case MD_MALLOC_MOVE_ZERO:
bzero(p, seg_len);
break;
case MD_MALLOC_MOVE_FILL:
memset(p, fill, seg_len);
break;
case MD_MALLOC_MOVE_READ:
bcopy(ptr, p, seg_len);
cpu_flush_dcache(p, seg_len);
break;
case MD_MALLOC_MOVE_WRITE:
bcopy(p, ptr, seg_len);
break;
case MD_MALLOC_MOVE_CMP:
end = p + seg_len;
first = *uc = *p;
/* Confirm all following bytes match the first */
while (++p < end) {
if (*p != first)
return (EDOOFUS);
}
break;
default:
KASSERT(0, ("md_malloc_move_vlist unknown op %d\n", op));
break;
}
ma_offs += seg_len;
if (ma_offs == vlist->ds_len) {
ma_offs = 0;
vlist++;
}
ptr = (uint8_t *)ptr + seg_len;
}
*pvlist = vlist;
*pma_offs = ma_offs;
return (0);
}
static int
mdstart_malloc(struct md_s *sc, struct bio *bp)
{
u_char *dst;
vm_page_t *m;
bus_dma_segment_t *vlist;
int i, error, error1, ma_offs, notmapped;
off_t secno, nsec, uc;
uintptr_t sp, osp;
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
case BIO_DELETE:
break;
case BIO_FLUSH:
return (0);
default:
return (EOPNOTSUPP);
}
notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0;
vlist = (bp->bio_flags & BIO_VLIST) != 0 ?
(bus_dma_segment_t *)bp->bio_data : NULL;
if (notmapped) {
m = bp->bio_ma;
ma_offs = bp->bio_ma_offset;
dst = NULL;
KASSERT(vlist == NULL, ("vlists cannot be unmapped"));
} else if (vlist != NULL) {
ma_offs = bp->bio_ma_offset;
dst = NULL;
} else {
dst = bp->bio_data;
}
nsec = bp->bio_length / sc->sectorsize;
secno = bp->bio_offset / sc->sectorsize;
error = 0;
while (nsec--) {
osp = s_read(sc->indir, secno);
if (bp->bio_cmd == BIO_DELETE) {
if (osp != 0)
error = s_write(sc->indir, secno, 0);
} else if (bp->bio_cmd == BIO_READ) {
if (osp == 0) {
if (notmapped) {
error = md_malloc_move_ma(&m, &ma_offs,
sc->sectorsize, NULL, 0,
MD_MALLOC_MOVE_ZERO);
} else if (vlist != NULL) {
error = md_malloc_move_vlist(&vlist,
&ma_offs, sc->sectorsize, NULL, 0,
MD_MALLOC_MOVE_ZERO);
} else
bzero(dst, sc->sectorsize);
} else if (osp <= 255) {
if (notmapped) {
error = md_malloc_move_ma(&m, &ma_offs,
sc->sectorsize, NULL, osp,
MD_MALLOC_MOVE_FILL);
} else if (vlist != NULL) {
error = md_malloc_move_vlist(&vlist,
&ma_offs, sc->sectorsize, NULL, osp,
MD_MALLOC_MOVE_FILL);
} else
memset(dst, osp, sc->sectorsize);
} else {
if (notmapped) {
error = md_malloc_move_ma(&m, &ma_offs,
sc->sectorsize, (void *)osp, 0,
MD_MALLOC_MOVE_READ);
} else if (vlist != NULL) {
error = md_malloc_move_vlist(&vlist,
&ma_offs, sc->sectorsize,
(void *)osp, 0,
MD_MALLOC_MOVE_READ);
} else {
bcopy((void *)osp, dst, sc->sectorsize);
cpu_flush_dcache(dst, sc->sectorsize);
}
}
osp = 0;
} else if (bp->bio_cmd == BIO_WRITE) {
if (sc->flags & MD_COMPRESS) {
if (notmapped) {
error1 = md_malloc_move_ma(&m, &ma_offs,
sc->sectorsize, &uc, 0,
MD_MALLOC_MOVE_CMP);
i = error1 == 0 ? sc->sectorsize : 0;
} else if (vlist != NULL) {
error1 = md_malloc_move_vlist(&vlist,
&ma_offs, sc->sectorsize, &uc, 0,
MD_MALLOC_MOVE_CMP);
i = error1 == 0 ? sc->sectorsize : 0;
} else {
uc = dst[0];
for (i = 1; i < sc->sectorsize; i++) {
if (dst[i] != uc)
break;
}
}
} else {
i = 0;
uc = 0;
}
if (i == sc->sectorsize) {
if (osp != uc)
error = s_write(sc->indir, secno, uc);
} else {
if (osp <= 255) {
sp = (uintptr_t)uma_zalloc(sc->uma,
md_malloc_wait ? M_WAITOK :
M_NOWAIT);
if (sp == 0) {
error = ENOSPC;
break;
}
if (notmapped) {
error = md_malloc_move_ma(&m,
&ma_offs, sc->sectorsize,
(void *)sp, 0,
MD_MALLOC_MOVE_WRITE);
} else if (vlist != NULL) {
error = md_malloc_move_vlist(
&vlist, &ma_offs,
sc->sectorsize, (void *)sp,
0, MD_MALLOC_MOVE_WRITE);
} else {
bcopy(dst, (void *)sp,
sc->sectorsize);
}
error = s_write(sc->indir, secno, sp);
} else {
if (notmapped) {
error = md_malloc_move_ma(&m,
&ma_offs, sc->sectorsize,
(void *)osp, 0,
MD_MALLOC_MOVE_WRITE);
} else if (vlist != NULL) {
error = md_malloc_move_vlist(
&vlist, &ma_offs,
sc->sectorsize, (void *)osp,
0, MD_MALLOC_MOVE_WRITE);
} else {
bcopy(dst, (void *)osp,
sc->sectorsize);
}
osp = 0;
}
}
} else {
error = EOPNOTSUPP;
}
if (osp > 255)
uma_zfree(sc->uma, (void*)osp);
if (error != 0)
break;
secno++;
if (!notmapped && vlist == NULL)
dst += sc->sectorsize;
}
bp->bio_resid = 0;
return (error);
}
static void
mdcopyto_vlist(void *src, bus_dma_segment_t *vlist, off_t offset, off_t len)
{
off_t seg_len;
while (offset >= vlist->ds_len) {
offset -= vlist->ds_len;
vlist++;
}
while (len != 0) {
seg_len = omin(len, vlist->ds_len - offset);
bcopy(src, (void *)(uintptr_t)(vlist->ds_addr + offset),
seg_len);
offset = 0;
src = (uint8_t *)src + seg_len;
len -= seg_len;
vlist++;
}
}
static void
mdcopyfrom_vlist(bus_dma_segment_t *vlist, off_t offset, void *dst, off_t len)
{
off_t seg_len;
while (offset >= vlist->ds_len) {
offset -= vlist->ds_len;
vlist++;
}
while (len != 0) {
seg_len = omin(len, vlist->ds_len - offset);
bcopy((void *)(uintptr_t)(vlist->ds_addr + offset), dst,
seg_len);
offset = 0;
dst = (uint8_t *)dst + seg_len;
len -= seg_len;
vlist++;
}
}
static int
mdstart_preload(struct md_s *sc, struct bio *bp)
{
uint8_t *p;
p = sc->pl_ptr + bp->bio_offset;
switch (bp->bio_cmd) {
case BIO_READ:
if ((bp->bio_flags & BIO_VLIST) != 0) {
mdcopyto_vlist(p, (bus_dma_segment_t *)bp->bio_data,
bp->bio_ma_offset, bp->bio_length);
} else {
bcopy(p, bp->bio_data, bp->bio_length);
}
cpu_flush_dcache(bp->bio_data, bp->bio_length);
break;
case BIO_WRITE:
if ((bp->bio_flags & BIO_VLIST) != 0) {
mdcopyfrom_vlist((bus_dma_segment_t *)bp->bio_data,
bp->bio_ma_offset, p, bp->bio_length);
} else {
bcopy(bp->bio_data, p, bp->bio_length);
}
break;
}
bp->bio_resid = 0;
return (0);
}
static int
mdstart_vnode(struct md_s *sc, struct bio *bp)
{
int error;
struct uio auio;
struct iovec aiov;
struct iovec *piov;
struct mount *mp;
struct vnode *vp;
bus_dma_segment_t *vlist;
struct thread *td;
off_t iolen, iostart, off, len;
int ma_offs, npages;
bool mapped;
td = curthread;
vp = sc->vnode;
piov = NULL;
ma_offs = bp->bio_ma_offset;
off = bp->bio_offset;
len = bp->bio_length;
mapped = false;
/*
* VNODE I/O
*
* If an error occurs, we set BIO_ERROR but we do not set
* B_INVAL because (for a write anyway), the buffer is
* still valid.
*/
switch (bp->bio_cmd) {
case BIO_READ:
auio.uio_rw = UIO_READ;
break;
case BIO_WRITE:
auio.uio_rw = UIO_WRITE;
break;
case BIO_FLUSH:
do {
(void)vn_start_write(vp, &mp, V_WAIT);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_FSYNC(vp, MNT_WAIT, td);
VOP_UNLOCK(vp);
vn_finished_write(mp);
} while (error == ERELOOKUP);
return (error);
case BIO_DELETE:
if (sc->candelete) {
error = vn_deallocate(vp, &off, &len, 0,
sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred,
NOCRED);
bp->bio_resid = len;
return (error);
}
/* FALLTHROUGH */
default:
return (EOPNOTSUPP);
}
auio.uio_offset = (vm_ooffset_t)bp->bio_offset;
auio.uio_resid = bp->bio_length;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_td = td;
if ((bp->bio_flags & BIO_VLIST) != 0) {
piov = malloc(sizeof(*piov) * bp->bio_ma_n, M_MD, M_WAITOK);
auio.uio_iov = piov;
vlist = (bus_dma_segment_t *)bp->bio_data;
while (len > 0) {
piov->iov_base = (void *)(uintptr_t)(vlist->ds_addr +
ma_offs);
piov->iov_len = vlist->ds_len - ma_offs;
if (piov->iov_len > len)
piov->iov_len = len;
len -= piov->iov_len;
ma_offs = 0;
vlist++;
piov++;
}
auio.uio_iovcnt = piov - auio.uio_iov;
piov = auio.uio_iov;
} else if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
bp->bio_resid = len;
unmapped_step:
npages = atop(min(maxphys, round_page(len + (ma_offs &
PAGE_MASK))));
iolen = min(ptoa(npages) - (ma_offs & PAGE_MASK), len);
KASSERT(iolen > 0, ("zero iolen"));
KASSERT(npages <= atop(maxphys + PAGE_SIZE),
("npages %d too large", npages));
pmap_qenter(sc->kva, &bp->bio_ma[atop(ma_offs)], npages);
aiov.iov_base = (void *)(sc->kva + (ma_offs & PAGE_MASK));
aiov.iov_len = iolen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = iolen;
mapped = true;
} else {
aiov.iov_base = bp->bio_data;
aiov.iov_len = bp->bio_length;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
}
iostart = auio.uio_offset;
if (bp->bio_cmd == BIO_READ) {
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_READ(vp, &auio, 0, sc->cred);
VOP_UNLOCK(vp);
} else {
(void) vn_start_write(vp, &mp, V_WAIT);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC,
sc->cred);
VOP_UNLOCK(vp);
vn_finished_write(mp);
if (error == 0)
sc->flags &= ~MD_VERIFY;
}
/* When MD_CACHE is set, try to avoid double-caching the data. */
if (error == 0 && (sc->flags & MD_CACHE) == 0)
VOP_ADVISE(vp, iostart, auio.uio_offset - 1,
POSIX_FADV_DONTNEED);
if (mapped) {