struct host_device_context {
/* must be 1st field
* FIXME this is a bug */
- struct work_struct host_rescan_work;
-
/* point back to our device context */
struct device_context *device_ctx;
struct kmem_cache *request_pool;
static int storvsc_device_alloc(struct scsi_device *);
static int storvsc_device_configure(struct scsi_device *);
static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd);
-static void storvsc_host_rescan_callback(struct work_struct *work);
-static void storvsc_host_rescan(struct hv_device *device_obj);
static int storvsc_remove(struct device *dev);
static struct scatterlist *create_bounce_buffer(struct scatterlist *sgl,
struct scatterlist *bounce_sgl,
unsigned int orig_sgl_count);
-static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[],
- unsigned int *lun_count);
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device *bdev,
sector_t capacity, int *info);
host_device_ctx->port = host->host_no;
host_device_ctx->device_ctx = device_ctx;
- INIT_WORK(&host_device_ctx->host_rescan_work,
- storvsc_host_rescan_callback);
-
host_device_ctx->request_pool =
kmem_cache_create(dev_name(&device_ctx->device),
sizeof(struct storvsc_cmd_request) +
return ret;
}
-/**
- * storvsc_host_rescan - Rescan the scsi HBA
- */
-static void storvsc_host_rescan_callback(struct work_struct *work)
-{
- struct hv_device *device_obj =
- &((struct host_device_context *)work)->device_ctx->device_obj;
- struct device_context *device_ctx = to_device_context(device_obj);
- struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device);
- struct scsi_device *sdev;
- struct host_device_context *host_device_ctx;
- struct scsi_device **sdevs_remove_list;
- unsigned int sdevs_count = 0;
- unsigned int found;
- unsigned int i;
- unsigned int lun_count = 0;
- unsigned int *lun_list;
-
- DPRINT_ENTER(STORVSC_DRV);
-
- host_device_ctx = (struct host_device_context *)host->hostdata;
- lun_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET, sizeof(unsigned int),
- GFP_ATOMIC);
- if (!lun_list) {
- DPRINT_ERR(STORVSC_DRV, "unable to allocate lun list");
- return;
- }
-
- sdevs_remove_list = kcalloc(STORVSC_MAX_LUNS_PER_TARGET,
- sizeof(void *), GFP_ATOMIC);
- if (!sdevs_remove_list) {
- kfree(lun_list);
- DPRINT_ERR(STORVSC_DRV, "unable to allocate lun remove list");
- return;
- }
-
- DPRINT_INFO(STORVSC_DRV, "rescanning host for new scsi devices...");
-
- /* Rescan for new device */
- scsi_scan_target(&host->shost_gendev, host_device_ctx->path,
- host_device_ctx->target, SCAN_WILD_CARD, 1);
-
- DPRINT_INFO(STORVSC_DRV, "rescanning host for removed scsi device...");
-
- /* Use the 1st device to send the report luns cmd */
- shost_for_each_device(sdev, host) {
- lun_count = STORVSC_MAX_LUNS_PER_TARGET;
- storvsc_report_luns(sdev, lun_list, &lun_count);
-
- DPRINT_INFO(STORVSC_DRV,
- "report luns on scsi device (%p) found %u luns ",
- sdev, lun_count);
- DPRINT_INFO(STORVSC_DRV,
- "existing luns on scsi device (%p) host (%d)",
- sdev, host->host_no);
-
- scsi_device_put(sdev);
- break;
- }
-
- for (i = 0; i < lun_count; i++)
- DPRINT_INFO(STORVSC_DRV, "%d) lun %u", i, lun_list[i]);
-
- /* Rescan for devices that may have been removed.
- * We do not have to worry that new devices may have been added since
- * this callback is serialized by the workqueue ie add/remove are done
- * here.
- */
- shost_for_each_device(sdev, host) {
- /* See if this device is still here */
- found = 0;
- for (i = 0; i < lun_count; i++) {
- if (sdev->lun == lun_list[i]) {
- found = 1;
- break;
- }
- }
- if (!found) {
- DPRINT_INFO(STORVSC_DRV, "lun (%u) does not exists",
- sdev->lun);
- sdevs_remove_list[sdevs_count++] = sdev;
- }
- }
-
- /* Now remove the devices */
- for (i = 0; i < sdevs_count; i++) {
- DPRINT_INFO(STORVSC_DRV,
- "removing scsi device (%p) lun (%u)...",
- sdevs_remove_list[i], sdevs_remove_list[i]->lun);
-
- /* make sure it is not removed from underneath us */
- if (!scsi_device_get(sdevs_remove_list[i])) {
- scsi_remove_device(sdevs_remove_list[i]);
- scsi_device_put(sdevs_remove_list[i]);
- }
- }
-
- DPRINT_INFO(STORVSC_DRV, "rescan completed on dev obj (%p) "
- "target (%u) bus (%u)", device_obj,
- host_device_ctx->target, host_device_ctx->path);
-
- kfree(lun_list);
- kfree(sdevs_remove_list);
-
- DPRINT_EXIT(STORVSC_DRV);
-}
-
-static int storvsc_report_luns(struct scsi_device *sdev, unsigned int luns[],
- unsigned int *lun_count)
-{
- int i, j;
- unsigned int lun = 0;
- unsigned int num_luns;
- int result;
- unsigned char *data;
- struct scsi_sense_hdr sshdr;
- unsigned char cmd[16] = {0};
- /* Add 1 to cover the report_lun header */
- unsigned int report_len = 8 * (STORVSC_MAX_LUNS_PER_TARGET+1);
- unsigned long long *report_luns;
- const unsigned int in_lun_count = *lun_count;
-
- *lun_count = 0;
-
- report_luns = kzalloc(report_len, GFP_ATOMIC);
- if (!report_luns)
- return -ENOMEM;
-
- cmd[0] = REPORT_LUNS;
-
- /* cmd length */
- *(unsigned int *)&cmd[6] = cpu_to_be32(report_len);
-
- result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE,
- (unsigned char *)report_luns, report_len,
- &sshdr, 30 * HZ, 3, NULL);
- if (result != 0) {
- kfree(report_luns);
- return -EBUSY;
- }
-
- /* get the length from the first four bytes */
- report_len = be32_to_cpu(*(unsigned int *)&report_luns[0]);
-
- num_luns = (report_len / sizeof(unsigned long long));
- if (num_luns > in_lun_count) {
- kfree(report_luns);
- return -EINVAL;
- }
-
- *lun_count = num_luns;
-
- DPRINT_DBG(STORVSC_DRV,
- "report luns on scsi device (%p) found %u luns ",
- sdev, num_luns);
-
- /* lun id starts at 1 */
- for (i = 1; i < num_luns + 1; i++) {
- lun = 0;
- data = (unsigned char *)&report_luns[i];
- for (j = 0; j < sizeof(lun); j += 2) {
- lun = lun | (((data[j] << 8) | data[j + 1]) <<
- (j * 8));
- }
-
- luns[i-1] = lun;
- }
-
- kfree(report_luns);
- return 0;
-}
-
-static void storvsc_host_rescan(struct hv_device *device_obj)
-{
- struct device_context *device_ctx = to_device_context(device_obj);
- struct Scsi_Host *host = dev_get_drvdata(&device_ctx->device);
- struct host_device_context *host_device_ctx;
-
- DPRINT_ENTER(STORVSC_DRV);
-
- host_device_ctx = (struct host_device_context *)host->hostdata;
-
- DPRINT_INFO(STORVSC_DRV, "initiating rescan on dev obj (%p) "
- "target (%u) bus (%u)...", device_obj,
- host_device_ctx->target, host_device_ctx->path);
-
- /*
- * We need to queue this since the scanning may block and the caller
- * may be in an intr context
- */
- /* scsi_queue_work(host, &host_device_ctx->host_rescan_work); */
- schedule_work(&host_device_ctx->host_rescan_work);
- DPRINT_EXIT(STORVSC_DRV);
-}
-
static int storvsc_get_chs(struct scsi_device *sdev, struct block_device * bdev,
sector_t capacity, int *info)
{
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff