#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
-#include <scsi/scsi_request.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
};
EXPORT_SYMBOL(scsi_device_types);
-/*
- * Function: scsi_allocate_request
- *
- * Purpose: Allocate a request descriptor.
- *
- * Arguments: device - device for which we want a request
- * gfp_mask - allocation flags passed to kmalloc
- *
- * Lock status: No locks assumed to be held. This function is SMP-safe.
- *
- * Returns: Pointer to request block.
- */
-struct scsi_request *scsi_allocate_request(struct scsi_device *sdev,
- gfp_t gfp_mask)
-{
- const int offset = ALIGN(sizeof(struct scsi_request), 4);
- const int size = offset + sizeof(struct request);
- struct scsi_request *sreq;
-
- sreq = kzalloc(size, gfp_mask);
- if (likely(sreq != NULL)) {
- sreq->sr_request = (struct request *)(((char *)sreq) + offset);
- sreq->sr_device = sdev;
- sreq->sr_host = sdev->host;
- sreq->sr_magic = SCSI_REQ_MAGIC;
- sreq->sr_data_direction = DMA_BIDIRECTIONAL;
- }
-
- return sreq;
-}
-EXPORT_SYMBOL(scsi_allocate_request);
-
-void __scsi_release_request(struct scsi_request *sreq)
-{
- struct request *req = sreq->sr_request;
-
- /* unlikely because the tag was usually ended earlier by the
- * mid-layer. However, for layering reasons ULD's don't end
- * the tag of commands they generate. */
- if (unlikely(blk_rq_tagged(req))) {
- unsigned long flags;
- struct request_queue *q = req->q;
-
- spin_lock_irqsave(q->queue_lock, flags);
- blk_queue_end_tag(q, req);
- spin_unlock_irqrestore(q->queue_lock, flags);
- }
-
-
- if (likely(sreq->sr_command != NULL)) {
- struct scsi_cmnd *cmd = sreq->sr_command;
-
- sreq->sr_command = NULL;
- scsi_next_command(cmd);
- }
-}
-
-/*
- * Function: scsi_release_request
- *
- * Purpose: Release a request descriptor.
- *
- * Arguments: sreq - request to release
- *
- * Lock status: No locks assumed to be held. This function is SMP-safe.
- */
-void scsi_release_request(struct scsi_request *sreq)
-{
- __scsi_release_request(sreq);
- kfree(sreq);
-}
-EXPORT_SYMBOL(scsi_release_request);
-
struct scsi_host_cmd_pool {
kmem_cache_t *slab;
unsigned int users;
if (level > 3) {
printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"
" done = 0x%p, queuecommand 0x%p\n",
- cmd->buffer, cmd->bufflen,
+ cmd->request_buffer, cmd->request_bufflen,
cmd->done,
sdev->host->hostt->queuecommand);
return rtn;
}
-/*
- * Function: scsi_init_cmd_from_req
- *
- * Purpose: Queue a SCSI command
- * Purpose: Initialize a struct scsi_cmnd from a struct scsi_request
- *
- * Arguments: cmd - command descriptor.
- * sreq - Request from the queue.
- *
- * Lock status: None needed.
- *
- * Returns: Nothing.
- *
- * Notes: Mainly transfer data from the request structure to the
- * command structure. The request structure is allocated
- * using the normal memory allocator, and requests can pile
- * up to more or less any depth. The command structure represents
- * a consumable resource, as these are allocated into a pool
- * when the SCSI subsystem initializes. The preallocation is
- * required so that in low-memory situations a disk I/O request
- * won't cause the memory manager to try and write out a page.
- * The request structure is generally used by ioctls and character
- * devices.
- */
-void scsi_init_cmd_from_req(struct scsi_cmnd *cmd, struct scsi_request *sreq)
-{
- sreq->sr_command = cmd;
-
- cmd->cmd_len = sreq->sr_cmd_len;
- cmd->use_sg = sreq->sr_use_sg;
-
- cmd->request = sreq->sr_request;
- memcpy(cmd->data_cmnd, sreq->sr_cmnd, sizeof(cmd->data_cmnd));
- cmd->serial_number = 0;
- cmd->bufflen = sreq->sr_bufflen;
- cmd->buffer = sreq->sr_buffer;
- cmd->retries = 0;
- cmd->allowed = sreq->sr_allowed;
- cmd->done = sreq->sr_done;
- cmd->timeout_per_command = sreq->sr_timeout_per_command;
- cmd->sc_data_direction = sreq->sr_data_direction;
- cmd->sglist_len = sreq->sr_sglist_len;
- cmd->underflow = sreq->sr_underflow;
- cmd->sc_request = sreq;
- memcpy(cmd->cmnd, sreq->sr_cmnd, sizeof(sreq->sr_cmnd));
-
- /*
- * Zero the sense buffer. Some host adapters automatically request
- * sense on error. 0 is not a valid sense code.
- */
- memset(cmd->sense_buffer, 0, sizeof(sreq->sr_sense_buffer));
- cmd->request_buffer = sreq->sr_buffer;
- cmd->request_bufflen = sreq->sr_bufflen;
- cmd->old_use_sg = cmd->use_sg;
- if (cmd->cmd_len == 0)
- cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
- cmd->old_cmd_len = cmd->cmd_len;
- cmd->sc_old_data_direction = cmd->sc_data_direction;
- cmd->old_underflow = cmd->underflow;
-
- /*
- * Start the timer ticking.
- */
- cmd->result = 0;
-
- SCSI_LOG_MLQUEUE(3, printk("Leaving scsi_init_cmd_from_req()\n"));
-}
/*
* Per-CPU I/O completion queue.
*/
static DEFINE_PER_CPU(struct list_head, scsi_done_q);
+/**
+ * scsi_req_abort_cmd -- Request command recovery for the specified command
+ * cmd: pointer to the SCSI command of interest
+ *
+ * This function requests that SCSI Core start recovery for the
+ * command by deleting the timer and adding the command to the eh
+ * queue. It can be called by either LLDDs or SCSI Core. LLDDs who
+ * implement their own error recovery MAY ignore the timeout event if
+ * they generated scsi_req_abort_cmd.
+ */
+void scsi_req_abort_cmd(struct scsi_cmnd *cmd)
+{
+ if (!scsi_delete_timer(cmd))
+ return;
+ scsi_times_out(cmd);
+}
+EXPORT_SYMBOL(scsi_req_abort_cmd);
+
/**
* scsi_done - Enqueue the finished SCSI command into the done queue.
* @cmd: The SCSI Command for which a low-level device driver (LLDD) gives
*/
int scsi_retry_command(struct scsi_cmnd *cmd)
{
- /*
- * Restore the SCSI command state.
- */
- scsi_setup_cmd_retry(cmd);
-
/*
* Zero the sense information from the last time we tried
* this command.
{
struct scsi_device *sdev = cmd->device;
struct Scsi_Host *shost = sdev->host;
- struct scsi_request *sreq;
scsi_device_unbusy(sdev);
"Notifying upper driver of completion "
"(result %x)\n", cmd->result));
- /*
- * We can get here with use_sg=0, causing a panic in the upper level
- */
- cmd->use_sg = cmd->old_use_sg;
-
- /*
- * If there is an associated request structure, copy the data over
- * before we call the completion function.
- */
- sreq = cmd->sc_request;
- if (sreq) {
- sreq->sr_result = sreq->sr_command->result;
- if (sreq->sr_result) {
- memcpy(sreq->sr_sense_buffer,
- sreq->sr_command->sense_buffer,
- sizeof(sreq->sr_sense_buffer));
- }
- }
-
cmd->done(cmd);
}
EXPORT_SYMBOL(scsi_finish_command);
git://git.onelab.eu / linux-2.6.git / blobdiff