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api.c
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api.c
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/*
* Copyright (c) 2014 Red Hat, Inc.
*
* This file is licensed to you under your choice of the GNU Lesser
* General Public License, version 2.1 or any later version (LGPLv2.1 or
* later), or the Apache License 2.0.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <sys/uio.h>
#include <string.h>
#include <scsi/scsi.h>
#include <endian.h>
#include <errno.h>
#include <assert.h>
#include "libtcmu_log.h"
#include "libtcmu_common.h"
#include "libtcmu_priv.h"
#include "be_byteshift.h"
int tcmu_cdb_get_length(uint8_t *cdb)
{
uint8_t group_code = cdb[0] >> 5;
/* See spc-4 4.2.5.1 operation code */
switch (group_code) {
case 0: /*000b for 6 bytes commands */
return 6;
case 1: /*001b for 10 bytes commands */
case 2: /*010b for 10 bytes commands */
return 10;
case 3: /*011b Reserved ? */
if (cdb[0] == 0x7f)
return 8 + cdb[7];
goto cdb_not_supp;
case 4: /*100b for 16 bytes commands */
return 16;
case 5: /*101b for 12 bytes commands */
return 12;
case 6: /*110b Vendor Specific */
case 7: /*111b Vendor Specific */
default:
/* TODO: */
goto cdb_not_supp;
}
cdb_not_supp:
tcmu_err("CDB %x0x not supported.\n", cdb[0]);
return -EINVAL;
}
uint64_t tcmu_cdb_get_lba(uint8_t *cdb)
{
uint16_t val;
switch (tcmu_cdb_get_length(cdb)) {
case 6:
val = be16toh(*((uint16_t *)&cdb[2]));
return ((cdb[1] & 0x1f) << 16) | val;
case 10:
return be32toh(*((u_int32_t *)&cdb[2]));
case 12:
return be32toh(*((u_int32_t *)&cdb[2]));
case 16:
return be64toh(*((u_int64_t *)&cdb[2]));
default:
assert_perror(EINVAL);
return 0; /* not reached */
}
}
uint32_t tcmu_cdb_get_xfer_length(uint8_t *cdb)
{
switch (tcmu_cdb_get_length(cdb)) {
case 6:
return cdb[4];
case 10:
return be16toh(*((uint16_t *)&cdb[7]));
case 12:
return be32toh(*((u_int32_t *)&cdb[6]));
case 16:
return be32toh(*((u_int32_t *)&cdb[10]));
default:
assert_perror(EINVAL);
return 0; /* not reached */
}
}
/*
* Returns location of first mismatch between bytes in mem and the iovec.
* If they are the same, return -1.
*/
off_t tcmu_iovec_compare(void *mem, struct iovec *iovec, size_t size)
{
off_t mem_off;
int ret;
mem_off = 0;
while (size) {
size_t part = min(size, iovec->iov_len);
ret = memcmp(mem + mem_off, iovec->iov_base, part);
if (ret) {
size_t pos;
char *spos = mem + mem_off;
char *dpos = iovec->iov_base;
/*
* Data differed, this is assumed to be 'rare'
* so use a much more expensive byte-by-byte
* comparison to find out at which offset the
* data differs.
*/
for (pos = 0; pos < part && *spos++ == *dpos++;
pos++)
;
return pos + mem_off;
}
size -= part;
mem_off += part;
iovec++;
}
return -1;
}
/*
* Consume an iovec. Count must not exceed the total iovec[] size.
*/
size_t tcmu_iovec_seek(struct iovec *iovec, size_t count)
{
size_t consumed = 0;
while (count) {
if (count >= iovec->iov_len) {
count -= iovec->iov_len;
iovec->iov_len = 0;
iovec++;
consumed++;
} else {
iovec->iov_base += count;
iovec->iov_len -= count;
count = 0;
}
}
return consumed;
}
/*
* Consume an iovec. Count must not exceed the total iovec[] size.
* iove count should be updated.
*/
void tcmu_cmd_seek(struct tcmulib_cmd *cmd, size_t count)
{
cmd->iov_cnt -= tcmu_iovec_seek(cmd->iovec, count);
}
size_t tcmu_iovec_length(struct iovec *iovec, size_t iov_cnt)
{
size_t length = 0;
while (iov_cnt) {
length += iovec->iov_len;
iovec++;
iov_cnt--;
}
return length;
}
void __tcmu_sense_set_data(uint8_t *sense_buf, uint8_t key, uint16_t asc_ascq)
{
sense_buf[0] |= 0x70; /* fixed, current */
sense_buf[2] = key;
sense_buf[7] = 0xa;
sense_buf[12] = (asc_ascq >> 8) & 0xff;
sense_buf[13] = asc_ascq & 0xff;
}
int tcmu_sense_set_data(uint8_t *sense_buf, uint8_t key, uint16_t asc_ascq)
{
memset(sense_buf, 0, SENSE_BUFFERSIZE);
__tcmu_sense_set_data(sense_buf, key, asc_ascq);
return TCMU_STS_PASSTHROUGH_ERR;
}
void tcmu_sense_set_key_specific_info(uint8_t *sense_buf, uint16_t info)
{
memset(sense_buf, 0, 18);
put_unaligned_be16(info, &sense_buf[16]);
/* Set SKSV bit */
sense_buf[15] |= 0x80;
}
void tcmu_sense_set_info(uint8_t *sense_buf, uint32_t info)
{
memset(sense_buf, 0, 18);
put_unaligned_be32(info, &sense_buf[3]);
/* Set VALID bit */
sense_buf[0] |= 0x80;
}
/*
* Zero iovec.
*/
void tcmu_iovec_zero(struct iovec *iovec, size_t iov_cnt)
{
while (iov_cnt) {
bzero(iovec->iov_base, iovec->iov_len);
iovec++;
iov_cnt--;
}
}
static inline bool tcmu_zeroed_mem(const char *buf, size_t size)
{
int i;
for (i = 0; i < size; i++) {
if (buf[i])
return false;
}
return true;
}
bool tcmu_iovec_zeroed(struct iovec *iovec, size_t iov_cnt)
{
int i;
for (i = 0; i < iov_cnt; i++) {
if (!tcmu_zeroed_mem(iovec[i].iov_base, iovec[i].iov_len))
return false;
}
return true;
}
/*
* Copy data into an iovec, and consume the space in the iovec.
*
* Will truncate instead of overrunning the iovec.
*/
size_t tcmu_memcpy_into_iovec(
struct iovec *iovec,
size_t iov_cnt,
void *src,
size_t len)
{
size_t copied = 0;
while (len && iov_cnt) {
size_t to_copy = min(iovec->iov_len, len);
if (to_copy) {
memcpy(iovec->iov_base, src + copied, to_copy);
len -= to_copy;
copied += to_copy;
iovec->iov_base += to_copy;
iovec->iov_len -= to_copy;
}
iovec++;
iov_cnt--;
}
return copied;
}
/*
* Copy data from an iovec, and consume the space in the iovec.
*/
size_t tcmu_memcpy_from_iovec(
void *dest,
size_t len,
struct iovec *iovec,
size_t iov_cnt)
{
size_t copied = 0;
while (len && iov_cnt) {
size_t to_copy = min(iovec->iov_len, len);
if (to_copy) {
memcpy(dest + copied, iovec->iov_base, to_copy);
len -= to_copy;
copied += to_copy;
iovec->iov_base += to_copy;
iovec->iov_len -= to_copy;
}
iovec++;
iov_cnt--;
}
return copied;
}
#define CDB_TO_BUF_SIZE(bytes) ((bytes) * 3 + 1)
#define CDB_FIX_BYTES 64 /* 64 bytes for default */
#define CDB_FIX_SIZE CDB_TO_BUF_SIZE(CDB_FIX_BYTES)
void tcmu_cdb_print_info(struct tcmu_device *dev,
const struct tcmulib_cmd *cmd,
const char *info)
{
int i, n, bytes;
char fix[CDB_FIX_SIZE], *buf;
buf = fix;
bytes = tcmu_cdb_get_length(cmd->cdb);
if (bytes < 0)
return;
if (bytes > CDB_FIX_SIZE) {
buf = malloc(CDB_TO_BUF_SIZE(bytes));
if (!buf) {
tcmu_dev_err(dev, "out of memory\n");
return;
}
}
for (i = 0, n = 0; i < bytes; i++) {
n += sprintf(buf + n, "%x ", cmd->cdb[i]);
}
if (info)
n += sprintf(buf + n, "%s", info);
sprintf(buf + n, "\n");
if (info) {
tcmu_dev_warn(dev, "%s", buf);
} else {
tcmu_dev_dbg_scsi_cmd(dev, "%s", buf);
}
if (bytes > CDB_FIX_SIZE)
free(buf);
}
void tcmu_thread_cancel(pthread_t thread)
{
void *join_retval;
int ret;
ret = pthread_cancel(thread);
if (ret) {
tcmu_err("pthread_cancel failed with value %d\n", ret);
return;
}
ret = pthread_join(thread, &join_retval);
if (ret) {
tcmu_err("pthread_join failed with value %d\n", ret);
return;
}
if (join_retval != PTHREAD_CANCELED)
tcmu_err("unexpected join retval: %p\n", join_retval);
}