static int file_open(struct tcmu_device *dev)
{
struct file_state *state;
int64_t size;
char *config;
state = calloc(1, sizeof(*state));
if (!state)
return -ENOMEM;
tcmu_set_dev_private(dev, state);
state->block_size = tcmu_get_attribute(dev, "hw_block_size");
if (state->block_size == -1) {
errp("Could not get device block size\n");
goto err;
}
size = tcmu_get_device_size(dev);
if (size == -1) {
errp("Could not get device size\n");
goto err;
}
state->num_lbas = size / state->block_size;
config = strchr(tcmu_get_dev_cfgstring(dev), '/');
if (!config) {
errp("no configuration found in cfgstring\n");
goto err;
}
config += 1; /* get past '/' */
state->fd = open(config, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
if (state->fd == -1) {
errp("could not open %s: %m\n", config);
goto err;
}
return 0;
err:
free(state);
return -EINVAL;
}
/*
* Return scsi status or TCMU_NOT_HANDLED
*/
int tcmu_glfs_handle_cmd(
struct tcmu_device *dev,
struct tcmulib_cmd *tcmulib_cmd)
{
uint8_t *cdb = tcmulib_cmd->cdb;
struct iovec *iovec = tcmulib_cmd->iovec;
size_t iov_cnt = tcmulib_cmd->iov_cnt;
uint8_t *sense = tcmulib_cmd->sense_buf;
struct glfs_state *state = tcmu_get_dev_private(dev);
uint8_t cmd;
glfs_fd_t *gfd = state->gfd;
int ret;
uint32_t length;
int result = SAM_STAT_GOOD;
char *tmpbuf;
uint64_t offset = state->block_size * tcmu_get_lba(cdb);
uint32_t tl = state->block_size * tcmu_get_xfer_length(cdb);
int do_verify = 0;
uint32_t cmp_offset;
ret = length = 0;
cmd = cdb[0];
switch (cmd) {
case INQUIRY:
return tcmu_emulate_inquiry(dev, cdb, iovec, iov_cnt, sense);
break;
case TEST_UNIT_READY:
return tcmu_emulate_test_unit_ready(cdb, iovec, iov_cnt, sense);
break;
case SERVICE_ACTION_IN_16:
if (cdb[1] == READ_CAPACITY_16) {
long long size;
unsigned long long num_lbas;
size = tcmu_get_device_size(dev);
if (size == -1) {
errp("Could not get device size\n");
return TCMU_NOT_HANDLED;
}
num_lbas = size / state->block_size;
return tcmu_emulate_read_capacity_16(num_lbas, state->block_size,
cdb, iovec, iov_cnt, sense);
} else {
return TCMU_NOT_HANDLED;
}
break;
case MODE_SENSE:
case MODE_SENSE_10:
return tcmu_emulate_mode_sense(cdb, iovec, iov_cnt, sense);
break;
case MODE_SELECT:
case MODE_SELECT_10:
return tcmu_emulate_mode_select(cdb, iovec, iov_cnt, sense);
break;
case COMPARE_AND_WRITE:
/* Blocks are transferred twice, first the set that
* we compare to the existing data, and second the set
* to write if the compare was successful.
*/
length = tl / 2;
tmpbuf = malloc(length);
if (!tmpbuf) {
result = tcmu_set_sense_data(sense, HARDWARE_ERROR,
ASC_INTERNAL_TARGET_FAILURE, NULL);
break;
}
ret = glfs_pread(gfd, tmpbuf, length, offset, SEEK_SET);
if (ret != length) {
result = set_medium_error(sense);
free(tmpbuf);
break;
}
cmp_offset = tcmu_compare_with_iovec(tmpbuf, iovec, length);
if (cmp_offset != -1) {
result = tcmu_set_sense_data(sense, MISCOMPARE,
ASC_MISCOMPARE_DURING_VERIFY_OPERATION,
&cmp_offset);
free(tmpbuf);
break;
}
free(tmpbuf);
tcmu_seek_in_iovec(iovec, length);
goto write;
case SYNCHRONIZE_CACHE:
case SYNCHRONIZE_CACHE_16:
if (cdb[1] & 0x2)
result = tcmu_set_sense_data(sense, ILLEGAL_REQUEST,
ASC_INVALID_FIELD_IN_CDB, NULL);
else
glfs_fdatasync(gfd);
break;
case WRITE_VERIFY:
case WRITE_VERIFY_12:
case WRITE_VERIFY_16:
do_verify = 1;
case WRITE_6:
case WRITE_10:
case WRITE_12:
case WRITE_16:
length = tl;
write:
ret = glfs_pwritev(gfd, iovec, iov_cnt, offset, ALLOWED_BSOFLAGS);
if (ret == length) {
/* Sync if FUA */
if ((cmd != WRITE_6) && (cdb[1] & 0x8))
glfs_fdatasync(gfd);
} else {
errp("Error on write %x %x\n", ret, length);
result = set_medium_error(sense);
break;
}
if (!do_verify)
break;
tmpbuf = malloc(length);
if (!tmpbuf) {
result = tcmu_set_sense_data(sense, HARDWARE_ERROR,
ASC_INTERNAL_TARGET_FAILURE, NULL);
break;
}
ret = glfs_pread(gfd, tmpbuf, length, offset, ALLOWED_BSOFLAGS);
if (ret != length) {
result = set_medium_error(sense);
free(tmpbuf);
break;
}
cmp_offset = tcmu_compare_with_iovec(tmpbuf, iovec, length);
if (cmp_offset != -1)
result = tcmu_set_sense_data(sense, MISCOMPARE,
ASC_MISCOMPARE_DURING_VERIFY_OPERATION,
&cmp_offset);
free(tmpbuf);
break;
case WRITE_SAME:
case WRITE_SAME_16:
errp("WRITE_SAME called, but has vpd b2 been implemented?\n");
result = tcmu_set_sense_data(sense, ILLEGAL_REQUEST,
ASC_INVALID_FIELD_IN_CDB, NULL);
break;
#if 0
/* WRITE_SAME used to punch hole in file */
if (cdb[1] & 0x08) {
ret = glfs_discard(gfd, offset, tl);
if (ret != 0) {
result = tcmu_set_sense_data(sense, HARDWARE_ERROR,
ASC_INTERNAL_TARGET_FAILURE, NULL);
}
break;
}
while (tl > 0) {
size_t blocksize = state->block_size;
uint32_t val32;
uint64_t val64;
assert(iovec->iov_len >= 8);
switch (cdb[1] & 0x06) {
case 0x02: /* PBDATA==0 LBDATA==1 */
val32 = htobe32(offset);
memcpy(iovec->iov_base, &val32, 4);
break;
case 0x04: /* PBDATA==1 LBDATA==0 */
/* physical sector format */
/* hey this is wrong val! But how to fix? */
val64 = htobe64(offset);
memcpy(iovec->iov_base, &val64, 8);
break;
default:
/* FIXME */
errp("PBDATA and LBDATA set!!!\n");
}
ret = glfs_pwritev(gfd, iovec, blocksize,
offset, ALLOWED_BSOFLAGS);
if (ret != blocksize)
result = set_medium_error(sense);
offset += blocksize;
tl -= blocksize;
}
break;
#endif
case READ_6:
case READ_10:
case READ_12:
case READ_16:
length = tcmu_iovec_length(iovec, iov_cnt);
ret = glfs_preadv(gfd, iovec, iov_cnt, offset, SEEK_SET);
if (ret != length) {
errp("Error on read %x %x\n", ret, length);
result = set_medium_error(sense);
}
break;
case UNMAP:
/* TODO: implement UNMAP */
result = tcmu_set_sense_data(sense, ILLEGAL_REQUEST,
ASC_INVALID_FIELD_IN_CDB, NULL);
break;
default:
result = TCMU_NOT_HANDLED;
break;
}
dbgp("io done %p %x %d %u\n", cdb, cmd, result, length);
if (result == TCMU_NOT_HANDLED)
dbgp("io not handled %p %x %x %d %d %llu\n",
cdb, result, cmd, ret, length, (unsigned long long)offset);
else if (result != SAM_STAT_GOOD) {
errp("io error %p %x %x %d %d %llu\n",
cdb, result, cmd, ret, length, (unsigned long long)offset);
}
return result;
}
static int tcmu_glfs_open(struct tcmu_device *dev)
{
struct glfs_state *gfsp;
int ret = 0;
char *config;
struct stat st;
int attribute;
gfsp = calloc(1, sizeof(*gfsp));
if (!gfsp)
return -ENOMEM;
tcmu_set_dev_private(dev, gfsp);
attribute = tcmu_get_attribute(dev, "hw_block_size");
if (attribute == -1) {
errp("Could not get hw_block_size setting\n");
goto fail;
}
gfsp->block_size = attribute;
config = strchr(tcmu_get_dev_cfgstring(dev), '/');
if (!config) {
errp("no configuration found in cfgstring\n");
goto fail;
}
config += 1; /* get past '/' */
if (parse_imagepath(config, &gfsp->servername, &gfsp->volname, &gfsp->pathname) == -1) {
errp("servername, volname, or pathname not set\n");
goto fail;
}
gfsp->fs = glfs_new(gfsp->volname);
if (!gfsp->fs) {
errp("glfs_new failed\n");
goto fail;
}
ret = glfs_set_volfile_server(gfsp->fs, "tcp", gfsp->servername,
GLUSTER_PORT);
if (ret) {
errp("glfs_set_volfile_server failed: %m\n");
goto fail;
}
ret = glfs_init(gfsp->fs);
if (ret) {
errp("glfs_init failed: %m\n");
goto fail;
}
gfsp->gfd = glfs_open(gfsp->fs, gfsp->pathname, ALLOWED_BSOFLAGS);
if (!gfsp->gfd) {
errp("glfs_open failed: %m\n");
goto fail;
}
ret = glfs_lstat(gfsp->fs, gfsp->pathname, &st);
if (ret) {
errp("glfs_lstat failed: %m\n");
goto fail;
}
if (st.st_size != tcmu_get_device_size(dev)) {
errp("device size and backing size disagree: "
"device %lld backing %lld\n",
tcmu_get_device_size(dev),
(long long) st.st_size);
goto fail;
}
return 0;
fail:
if (gfsp->gfd)
glfs_close(gfsp->gfd);
if (gfsp->fs)
glfs_fini(gfsp->fs);
free(gfsp->volname);
free(gfsp->pathname);
free(gfsp->servername);
free(gfsp);
return -EIO;
}
