Add printf() wrapper to use CR/CRLF terminators depending on whether stdio is mapped to a tty open in raw mode. Try to use the wrapper everywhere. For now we leave the custom DPRINTF/WPRINTF defined by device models, but we may remove them in the future. Reviewed by: grehan, jhb MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D22657
852 lines
18 KiB
C
852 lines
18 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2013 Peter Grehan <grehan@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#ifndef WITHOUT_CAPSICUM
|
|
#include <sys/capsicum.h>
|
|
#endif
|
|
#include <sys/queue.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/disk.h>
|
|
|
|
#include <assert.h>
|
|
#ifndef WITHOUT_CAPSICUM
|
|
#include <capsicum_helpers.h>
|
|
#endif
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <pthread.h>
|
|
#include <pthread_np.h>
|
|
#include <signal.h>
|
|
#include <sysexits.h>
|
|
#include <unistd.h>
|
|
|
|
#include <machine/atomic.h>
|
|
|
|
#include "bhyverun.h"
|
|
#include "debug.h"
|
|
#include "mevent.h"
|
|
#include "block_if.h"
|
|
|
|
#define BLOCKIF_SIG 0xb109b109
|
|
|
|
#define BLOCKIF_NUMTHR 8
|
|
#define BLOCKIF_MAXREQ (BLOCKIF_RING_MAX + BLOCKIF_NUMTHR)
|
|
|
|
enum blockop {
|
|
BOP_READ,
|
|
BOP_WRITE,
|
|
BOP_FLUSH,
|
|
BOP_DELETE
|
|
};
|
|
|
|
enum blockstat {
|
|
BST_FREE,
|
|
BST_BLOCK,
|
|
BST_PEND,
|
|
BST_BUSY,
|
|
BST_DONE
|
|
};
|
|
|
|
struct blockif_elem {
|
|
TAILQ_ENTRY(blockif_elem) be_link;
|
|
struct blockif_req *be_req;
|
|
enum blockop be_op;
|
|
enum blockstat be_status;
|
|
pthread_t be_tid;
|
|
off_t be_block;
|
|
};
|
|
|
|
struct blockif_ctxt {
|
|
int bc_magic;
|
|
int bc_fd;
|
|
int bc_ischr;
|
|
int bc_isgeom;
|
|
int bc_candelete;
|
|
int bc_rdonly;
|
|
off_t bc_size;
|
|
int bc_sectsz;
|
|
int bc_psectsz;
|
|
int bc_psectoff;
|
|
int bc_closing;
|
|
pthread_t bc_btid[BLOCKIF_NUMTHR];
|
|
pthread_mutex_t bc_mtx;
|
|
pthread_cond_t bc_cond;
|
|
|
|
/* Request elements and free/pending/busy queues */
|
|
TAILQ_HEAD(, blockif_elem) bc_freeq;
|
|
TAILQ_HEAD(, blockif_elem) bc_pendq;
|
|
TAILQ_HEAD(, blockif_elem) bc_busyq;
|
|
struct blockif_elem bc_reqs[BLOCKIF_MAXREQ];
|
|
};
|
|
|
|
static pthread_once_t blockif_once = PTHREAD_ONCE_INIT;
|
|
|
|
struct blockif_sig_elem {
|
|
pthread_mutex_t bse_mtx;
|
|
pthread_cond_t bse_cond;
|
|
int bse_pending;
|
|
struct blockif_sig_elem *bse_next;
|
|
};
|
|
|
|
static struct blockif_sig_elem *blockif_bse_head;
|
|
|
|
static int
|
|
blockif_enqueue(struct blockif_ctxt *bc, struct blockif_req *breq,
|
|
enum blockop op)
|
|
{
|
|
struct blockif_elem *be, *tbe;
|
|
off_t off;
|
|
int i;
|
|
|
|
be = TAILQ_FIRST(&bc->bc_freeq);
|
|
assert(be != NULL);
|
|
assert(be->be_status == BST_FREE);
|
|
TAILQ_REMOVE(&bc->bc_freeq, be, be_link);
|
|
be->be_req = breq;
|
|
be->be_op = op;
|
|
switch (op) {
|
|
case BOP_READ:
|
|
case BOP_WRITE:
|
|
case BOP_DELETE:
|
|
off = breq->br_offset;
|
|
for (i = 0; i < breq->br_iovcnt; i++)
|
|
off += breq->br_iov[i].iov_len;
|
|
break;
|
|
default:
|
|
off = OFF_MAX;
|
|
}
|
|
be->be_block = off;
|
|
TAILQ_FOREACH(tbe, &bc->bc_pendq, be_link) {
|
|
if (tbe->be_block == breq->br_offset)
|
|
break;
|
|
}
|
|
if (tbe == NULL) {
|
|
TAILQ_FOREACH(tbe, &bc->bc_busyq, be_link) {
|
|
if (tbe->be_block == breq->br_offset)
|
|
break;
|
|
}
|
|
}
|
|
if (tbe == NULL)
|
|
be->be_status = BST_PEND;
|
|
else
|
|
be->be_status = BST_BLOCK;
|
|
TAILQ_INSERT_TAIL(&bc->bc_pendq, be, be_link);
|
|
return (be->be_status == BST_PEND);
|
|
}
|
|
|
|
static int
|
|
blockif_dequeue(struct blockif_ctxt *bc, pthread_t t, struct blockif_elem **bep)
|
|
{
|
|
struct blockif_elem *be;
|
|
|
|
TAILQ_FOREACH(be, &bc->bc_pendq, be_link) {
|
|
if (be->be_status == BST_PEND)
|
|
break;
|
|
assert(be->be_status == BST_BLOCK);
|
|
}
|
|
if (be == NULL)
|
|
return (0);
|
|
TAILQ_REMOVE(&bc->bc_pendq, be, be_link);
|
|
be->be_status = BST_BUSY;
|
|
be->be_tid = t;
|
|
TAILQ_INSERT_TAIL(&bc->bc_busyq, be, be_link);
|
|
*bep = be;
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
blockif_complete(struct blockif_ctxt *bc, struct blockif_elem *be)
|
|
{
|
|
struct blockif_elem *tbe;
|
|
|
|
if (be->be_status == BST_DONE || be->be_status == BST_BUSY)
|
|
TAILQ_REMOVE(&bc->bc_busyq, be, be_link);
|
|
else
|
|
TAILQ_REMOVE(&bc->bc_pendq, be, be_link);
|
|
TAILQ_FOREACH(tbe, &bc->bc_pendq, be_link) {
|
|
if (tbe->be_req->br_offset == be->be_block)
|
|
tbe->be_status = BST_PEND;
|
|
}
|
|
be->be_tid = 0;
|
|
be->be_status = BST_FREE;
|
|
be->be_req = NULL;
|
|
TAILQ_INSERT_TAIL(&bc->bc_freeq, be, be_link);
|
|
}
|
|
|
|
static void
|
|
blockif_proc(struct blockif_ctxt *bc, struct blockif_elem *be, uint8_t *buf)
|
|
{
|
|
struct blockif_req *br;
|
|
off_t arg[2];
|
|
ssize_t clen, len, off, boff, voff;
|
|
int i, err;
|
|
|
|
br = be->be_req;
|
|
if (br->br_iovcnt <= 1)
|
|
buf = NULL;
|
|
err = 0;
|
|
switch (be->be_op) {
|
|
case BOP_READ:
|
|
if (buf == NULL) {
|
|
if ((len = preadv(bc->bc_fd, br->br_iov, br->br_iovcnt,
|
|
br->br_offset)) < 0)
|
|
err = errno;
|
|
else
|
|
br->br_resid -= len;
|
|
break;
|
|
}
|
|
i = 0;
|
|
off = voff = 0;
|
|
while (br->br_resid > 0) {
|
|
len = MIN(br->br_resid, MAXPHYS);
|
|
if (pread(bc->bc_fd, buf, len, br->br_offset +
|
|
off) < 0) {
|
|
err = errno;
|
|
break;
|
|
}
|
|
boff = 0;
|
|
do {
|
|
clen = MIN(len - boff, br->br_iov[i].iov_len -
|
|
voff);
|
|
memcpy(br->br_iov[i].iov_base + voff,
|
|
buf + boff, clen);
|
|
if (clen < br->br_iov[i].iov_len - voff)
|
|
voff += clen;
|
|
else {
|
|
i++;
|
|
voff = 0;
|
|
}
|
|
boff += clen;
|
|
} while (boff < len);
|
|
off += len;
|
|
br->br_resid -= len;
|
|
}
|
|
break;
|
|
case BOP_WRITE:
|
|
if (bc->bc_rdonly) {
|
|
err = EROFS;
|
|
break;
|
|
}
|
|
if (buf == NULL) {
|
|
if ((len = pwritev(bc->bc_fd, br->br_iov, br->br_iovcnt,
|
|
br->br_offset)) < 0)
|
|
err = errno;
|
|
else
|
|
br->br_resid -= len;
|
|
break;
|
|
}
|
|
i = 0;
|
|
off = voff = 0;
|
|
while (br->br_resid > 0) {
|
|
len = MIN(br->br_resid, MAXPHYS);
|
|
boff = 0;
|
|
do {
|
|
clen = MIN(len - boff, br->br_iov[i].iov_len -
|
|
voff);
|
|
memcpy(buf + boff,
|
|
br->br_iov[i].iov_base + voff, clen);
|
|
if (clen < br->br_iov[i].iov_len - voff)
|
|
voff += clen;
|
|
else {
|
|
i++;
|
|
voff = 0;
|
|
}
|
|
boff += clen;
|
|
} while (boff < len);
|
|
if (pwrite(bc->bc_fd, buf, len, br->br_offset +
|
|
off) < 0) {
|
|
err = errno;
|
|
break;
|
|
}
|
|
off += len;
|
|
br->br_resid -= len;
|
|
}
|
|
break;
|
|
case BOP_FLUSH:
|
|
if (bc->bc_ischr) {
|
|
if (ioctl(bc->bc_fd, DIOCGFLUSH))
|
|
err = errno;
|
|
} else if (fsync(bc->bc_fd))
|
|
err = errno;
|
|
break;
|
|
case BOP_DELETE:
|
|
if (!bc->bc_candelete)
|
|
err = EOPNOTSUPP;
|
|
else if (bc->bc_rdonly)
|
|
err = EROFS;
|
|
else if (bc->bc_ischr) {
|
|
arg[0] = br->br_offset;
|
|
arg[1] = br->br_resid;
|
|
if (ioctl(bc->bc_fd, DIOCGDELETE, arg))
|
|
err = errno;
|
|
else
|
|
br->br_resid = 0;
|
|
} else
|
|
err = EOPNOTSUPP;
|
|
break;
|
|
default:
|
|
err = EINVAL;
|
|
break;
|
|
}
|
|
|
|
be->be_status = BST_DONE;
|
|
|
|
(*br->br_callback)(br, err);
|
|
}
|
|
|
|
static void *
|
|
blockif_thr(void *arg)
|
|
{
|
|
struct blockif_ctxt *bc;
|
|
struct blockif_elem *be;
|
|
pthread_t t;
|
|
uint8_t *buf;
|
|
|
|
bc = arg;
|
|
if (bc->bc_isgeom)
|
|
buf = malloc(MAXPHYS);
|
|
else
|
|
buf = NULL;
|
|
t = pthread_self();
|
|
|
|
pthread_mutex_lock(&bc->bc_mtx);
|
|
for (;;) {
|
|
while (blockif_dequeue(bc, t, &be)) {
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
blockif_proc(bc, be, buf);
|
|
pthread_mutex_lock(&bc->bc_mtx);
|
|
blockif_complete(bc, be);
|
|
}
|
|
/* Check ctxt status here to see if exit requested */
|
|
if (bc->bc_closing)
|
|
break;
|
|
pthread_cond_wait(&bc->bc_cond, &bc->bc_mtx);
|
|
}
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
|
|
if (buf)
|
|
free(buf);
|
|
pthread_exit(NULL);
|
|
return (NULL);
|
|
}
|
|
|
|
static void
|
|
blockif_sigcont_handler(int signal, enum ev_type type, void *arg)
|
|
{
|
|
struct blockif_sig_elem *bse;
|
|
|
|
for (;;) {
|
|
/*
|
|
* Process the entire list even if not intended for
|
|
* this thread.
|
|
*/
|
|
do {
|
|
bse = blockif_bse_head;
|
|
if (bse == NULL)
|
|
return;
|
|
} while (!atomic_cmpset_ptr((uintptr_t *)&blockif_bse_head,
|
|
(uintptr_t)bse,
|
|
(uintptr_t)bse->bse_next));
|
|
|
|
pthread_mutex_lock(&bse->bse_mtx);
|
|
bse->bse_pending = 0;
|
|
pthread_cond_signal(&bse->bse_cond);
|
|
pthread_mutex_unlock(&bse->bse_mtx);
|
|
}
|
|
}
|
|
|
|
static void
|
|
blockif_init(void)
|
|
{
|
|
mevent_add(SIGCONT, EVF_SIGNAL, blockif_sigcont_handler, NULL);
|
|
(void) signal(SIGCONT, SIG_IGN);
|
|
}
|
|
|
|
struct blockif_ctxt *
|
|
blockif_open(const char *optstr, const char *ident)
|
|
{
|
|
char tname[MAXCOMLEN + 1];
|
|
char name[MAXPATHLEN];
|
|
char *nopt, *xopts, *cp;
|
|
struct blockif_ctxt *bc;
|
|
struct stat sbuf;
|
|
struct diocgattr_arg arg;
|
|
off_t size, psectsz, psectoff;
|
|
int extra, fd, i, sectsz;
|
|
int nocache, sync, ro, candelete, geom, ssopt, pssopt;
|
|
#ifndef WITHOUT_CAPSICUM
|
|
cap_rights_t rights;
|
|
cap_ioctl_t cmds[] = { DIOCGFLUSH, DIOCGDELETE };
|
|
#endif
|
|
|
|
pthread_once(&blockif_once, blockif_init);
|
|
|
|
fd = -1;
|
|
ssopt = 0;
|
|
nocache = 0;
|
|
sync = 0;
|
|
ro = 0;
|
|
|
|
/*
|
|
* The first element in the optstring is always a pathname.
|
|
* Optional elements follow
|
|
*/
|
|
nopt = xopts = strdup(optstr);
|
|
while (xopts != NULL) {
|
|
cp = strsep(&xopts, ",");
|
|
if (cp == nopt) /* file or device pathname */
|
|
continue;
|
|
else if (!strcmp(cp, "nocache"))
|
|
nocache = 1;
|
|
else if (!strcmp(cp, "sync") || !strcmp(cp, "direct"))
|
|
sync = 1;
|
|
else if (!strcmp(cp, "ro"))
|
|
ro = 1;
|
|
else if (sscanf(cp, "sectorsize=%d/%d", &ssopt, &pssopt) == 2)
|
|
;
|
|
else if (sscanf(cp, "sectorsize=%d", &ssopt) == 1)
|
|
pssopt = ssopt;
|
|
else {
|
|
EPRINTLN("Invalid device option \"%s\"", cp);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
extra = 0;
|
|
if (nocache)
|
|
extra |= O_DIRECT;
|
|
if (sync)
|
|
extra |= O_SYNC;
|
|
|
|
fd = open(nopt, (ro ? O_RDONLY : O_RDWR) | extra);
|
|
if (fd < 0 && !ro) {
|
|
/* Attempt a r/w fail with a r/o open */
|
|
fd = open(nopt, O_RDONLY | extra);
|
|
ro = 1;
|
|
}
|
|
|
|
if (fd < 0) {
|
|
warn("Could not open backing file: %s", nopt);
|
|
goto err;
|
|
}
|
|
|
|
if (fstat(fd, &sbuf) < 0) {
|
|
warn("Could not stat backing file %s", nopt);
|
|
goto err;
|
|
}
|
|
|
|
#ifndef WITHOUT_CAPSICUM
|
|
cap_rights_init(&rights, CAP_FSYNC, CAP_IOCTL, CAP_READ, CAP_SEEK,
|
|
CAP_WRITE);
|
|
if (ro)
|
|
cap_rights_clear(&rights, CAP_FSYNC, CAP_WRITE);
|
|
|
|
if (caph_rights_limit(fd, &rights) == -1)
|
|
errx(EX_OSERR, "Unable to apply rights for sandbox");
|
|
#endif
|
|
|
|
/*
|
|
* Deal with raw devices
|
|
*/
|
|
size = sbuf.st_size;
|
|
sectsz = DEV_BSIZE;
|
|
psectsz = psectoff = 0;
|
|
candelete = geom = 0;
|
|
if (S_ISCHR(sbuf.st_mode)) {
|
|
if (ioctl(fd, DIOCGMEDIASIZE, &size) < 0 ||
|
|
ioctl(fd, DIOCGSECTORSIZE, §sz)) {
|
|
perror("Could not fetch dev blk/sector size");
|
|
goto err;
|
|
}
|
|
assert(size != 0);
|
|
assert(sectsz != 0);
|
|
if (ioctl(fd, DIOCGSTRIPESIZE, &psectsz) == 0 && psectsz > 0)
|
|
ioctl(fd, DIOCGSTRIPEOFFSET, &psectoff);
|
|
strlcpy(arg.name, "GEOM::candelete", sizeof(arg.name));
|
|
arg.len = sizeof(arg.value.i);
|
|
if (ioctl(fd, DIOCGATTR, &arg) == 0)
|
|
candelete = arg.value.i;
|
|
if (ioctl(fd, DIOCGPROVIDERNAME, name) == 0)
|
|
geom = 1;
|
|
} else
|
|
psectsz = sbuf.st_blksize;
|
|
|
|
#ifndef WITHOUT_CAPSICUM
|
|
if (caph_ioctls_limit(fd, cmds, nitems(cmds)) == -1)
|
|
errx(EX_OSERR, "Unable to apply rights for sandbox");
|
|
#endif
|
|
|
|
if (ssopt != 0) {
|
|
if (!powerof2(ssopt) || !powerof2(pssopt) || ssopt < 512 ||
|
|
ssopt > pssopt) {
|
|
EPRINTLN("Invalid sector size %d/%d",
|
|
ssopt, pssopt);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* Some backend drivers (e.g. cd0, ada0) require that the I/O
|
|
* size be a multiple of the device's sector size.
|
|
*
|
|
* Validate that the emulated sector size complies with this
|
|
* requirement.
|
|
*/
|
|
if (S_ISCHR(sbuf.st_mode)) {
|
|
if (ssopt < sectsz || (ssopt % sectsz) != 0) {
|
|
EPRINTLN("Sector size %d incompatible "
|
|
"with underlying device sector size %d",
|
|
ssopt, sectsz);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
sectsz = ssopt;
|
|
psectsz = pssopt;
|
|
psectoff = 0;
|
|
}
|
|
|
|
bc = calloc(1, sizeof(struct blockif_ctxt));
|
|
if (bc == NULL) {
|
|
perror("calloc");
|
|
goto err;
|
|
}
|
|
|
|
bc->bc_magic = BLOCKIF_SIG;
|
|
bc->bc_fd = fd;
|
|
bc->bc_ischr = S_ISCHR(sbuf.st_mode);
|
|
bc->bc_isgeom = geom;
|
|
bc->bc_candelete = candelete;
|
|
bc->bc_rdonly = ro;
|
|
bc->bc_size = size;
|
|
bc->bc_sectsz = sectsz;
|
|
bc->bc_psectsz = psectsz;
|
|
bc->bc_psectoff = psectoff;
|
|
pthread_mutex_init(&bc->bc_mtx, NULL);
|
|
pthread_cond_init(&bc->bc_cond, NULL);
|
|
TAILQ_INIT(&bc->bc_freeq);
|
|
TAILQ_INIT(&bc->bc_pendq);
|
|
TAILQ_INIT(&bc->bc_busyq);
|
|
for (i = 0; i < BLOCKIF_MAXREQ; i++) {
|
|
bc->bc_reqs[i].be_status = BST_FREE;
|
|
TAILQ_INSERT_HEAD(&bc->bc_freeq, &bc->bc_reqs[i], be_link);
|
|
}
|
|
|
|
for (i = 0; i < BLOCKIF_NUMTHR; i++) {
|
|
pthread_create(&bc->bc_btid[i], NULL, blockif_thr, bc);
|
|
snprintf(tname, sizeof(tname), "blk-%s-%d", ident, i);
|
|
pthread_set_name_np(bc->bc_btid[i], tname);
|
|
}
|
|
|
|
return (bc);
|
|
err:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
free(nopt);
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
blockif_request(struct blockif_ctxt *bc, struct blockif_req *breq,
|
|
enum blockop op)
|
|
{
|
|
int err;
|
|
|
|
err = 0;
|
|
|
|
pthread_mutex_lock(&bc->bc_mtx);
|
|
if (!TAILQ_EMPTY(&bc->bc_freeq)) {
|
|
/*
|
|
* Enqueue and inform the block i/o thread
|
|
* that there is work available
|
|
*/
|
|
if (blockif_enqueue(bc, breq, op))
|
|
pthread_cond_signal(&bc->bc_cond);
|
|
} else {
|
|
/*
|
|
* Callers are not allowed to enqueue more than
|
|
* the specified blockif queue limit. Return an
|
|
* error to indicate that the queue length has been
|
|
* exceeded.
|
|
*/
|
|
err = E2BIG;
|
|
}
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
|
|
return (err);
|
|
}
|
|
|
|
int
|
|
blockif_read(struct blockif_ctxt *bc, struct blockif_req *breq)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (blockif_request(bc, breq, BOP_READ));
|
|
}
|
|
|
|
int
|
|
blockif_write(struct blockif_ctxt *bc, struct blockif_req *breq)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (blockif_request(bc, breq, BOP_WRITE));
|
|
}
|
|
|
|
int
|
|
blockif_flush(struct blockif_ctxt *bc, struct blockif_req *breq)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (blockif_request(bc, breq, BOP_FLUSH));
|
|
}
|
|
|
|
int
|
|
blockif_delete(struct blockif_ctxt *bc, struct blockif_req *breq)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (blockif_request(bc, breq, BOP_DELETE));
|
|
}
|
|
|
|
int
|
|
blockif_cancel(struct blockif_ctxt *bc, struct blockif_req *breq)
|
|
{
|
|
struct blockif_elem *be;
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
|
|
pthread_mutex_lock(&bc->bc_mtx);
|
|
/*
|
|
* Check pending requests.
|
|
*/
|
|
TAILQ_FOREACH(be, &bc->bc_pendq, be_link) {
|
|
if (be->be_req == breq)
|
|
break;
|
|
}
|
|
if (be != NULL) {
|
|
/*
|
|
* Found it.
|
|
*/
|
|
blockif_complete(bc, be);
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check in-flight requests.
|
|
*/
|
|
TAILQ_FOREACH(be, &bc->bc_busyq, be_link) {
|
|
if (be->be_req == breq)
|
|
break;
|
|
}
|
|
if (be == NULL) {
|
|
/*
|
|
* Didn't find it.
|
|
*/
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Interrupt the processing thread to force it return
|
|
* prematurely via it's normal callback path.
|
|
*/
|
|
while (be->be_status == BST_BUSY) {
|
|
struct blockif_sig_elem bse, *old_head;
|
|
|
|
pthread_mutex_init(&bse.bse_mtx, NULL);
|
|
pthread_cond_init(&bse.bse_cond, NULL);
|
|
|
|
bse.bse_pending = 1;
|
|
|
|
do {
|
|
old_head = blockif_bse_head;
|
|
bse.bse_next = old_head;
|
|
} while (!atomic_cmpset_ptr((uintptr_t *)&blockif_bse_head,
|
|
(uintptr_t)old_head,
|
|
(uintptr_t)&bse));
|
|
|
|
pthread_kill(be->be_tid, SIGCONT);
|
|
|
|
pthread_mutex_lock(&bse.bse_mtx);
|
|
while (bse.bse_pending)
|
|
pthread_cond_wait(&bse.bse_cond, &bse.bse_mtx);
|
|
pthread_mutex_unlock(&bse.bse_mtx);
|
|
}
|
|
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
|
|
/*
|
|
* The processing thread has been interrupted. Since it's not
|
|
* clear if the callback has been invoked yet, return EBUSY.
|
|
*/
|
|
return (EBUSY);
|
|
}
|
|
|
|
int
|
|
blockif_close(struct blockif_ctxt *bc)
|
|
{
|
|
void *jval;
|
|
int i;
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
|
|
/*
|
|
* Stop the block i/o thread
|
|
*/
|
|
pthread_mutex_lock(&bc->bc_mtx);
|
|
bc->bc_closing = 1;
|
|
pthread_mutex_unlock(&bc->bc_mtx);
|
|
pthread_cond_broadcast(&bc->bc_cond);
|
|
for (i = 0; i < BLOCKIF_NUMTHR; i++)
|
|
pthread_join(bc->bc_btid[i], &jval);
|
|
|
|
/* XXX Cancel queued i/o's ??? */
|
|
|
|
/*
|
|
* Release resources
|
|
*/
|
|
bc->bc_magic = 0;
|
|
close(bc->bc_fd);
|
|
free(bc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return virtual C/H/S values for a given block. Use the algorithm
|
|
* outlined in the VHD specification to calculate values.
|
|
*/
|
|
void
|
|
blockif_chs(struct blockif_ctxt *bc, uint16_t *c, uint8_t *h, uint8_t *s)
|
|
{
|
|
off_t sectors; /* total sectors of the block dev */
|
|
off_t hcyl; /* cylinders times heads */
|
|
uint16_t secpt; /* sectors per track */
|
|
uint8_t heads;
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
|
|
sectors = bc->bc_size / bc->bc_sectsz;
|
|
|
|
/* Clamp the size to the largest possible with CHS */
|
|
if (sectors > 65535UL*16*255)
|
|
sectors = 65535UL*16*255;
|
|
|
|
if (sectors >= 65536UL*16*63) {
|
|
secpt = 255;
|
|
heads = 16;
|
|
hcyl = sectors / secpt;
|
|
} else {
|
|
secpt = 17;
|
|
hcyl = sectors / secpt;
|
|
heads = (hcyl + 1023) / 1024;
|
|
|
|
if (heads < 4)
|
|
heads = 4;
|
|
|
|
if (hcyl >= (heads * 1024) || heads > 16) {
|
|
secpt = 31;
|
|
heads = 16;
|
|
hcyl = sectors / secpt;
|
|
}
|
|
if (hcyl >= (heads * 1024)) {
|
|
secpt = 63;
|
|
heads = 16;
|
|
hcyl = sectors / secpt;
|
|
}
|
|
}
|
|
|
|
*c = hcyl / heads;
|
|
*h = heads;
|
|
*s = secpt;
|
|
}
|
|
|
|
/*
|
|
* Accessors
|
|
*/
|
|
off_t
|
|
blockif_size(struct blockif_ctxt *bc)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (bc->bc_size);
|
|
}
|
|
|
|
int
|
|
blockif_sectsz(struct blockif_ctxt *bc)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (bc->bc_sectsz);
|
|
}
|
|
|
|
void
|
|
blockif_psectsz(struct blockif_ctxt *bc, int *size, int *off)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
*size = bc->bc_psectsz;
|
|
*off = bc->bc_psectoff;
|
|
}
|
|
|
|
int
|
|
blockif_queuesz(struct blockif_ctxt *bc)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (BLOCKIF_MAXREQ - 1);
|
|
}
|
|
|
|
int
|
|
blockif_is_ro(struct blockif_ctxt *bc)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (bc->bc_rdonly);
|
|
}
|
|
|
|
int
|
|
blockif_candelete(struct blockif_ctxt *bc)
|
|
{
|
|
|
|
assert(bc->bc_magic == BLOCKIF_SIG);
|
|
return (bc->bc_candelete);
|
|
}
|