* is invalid. Prevent the garbage from being misinterpreted
* and prevent security leaks by zeroing out the excess data.
*/
- if (unlikely(req->data_len > 0 && req->data_len <= bufflen))
- memset(buffer + (bufflen - req->data_len), 0, req->data_len);
+ if (unlikely(req->resid_len > 0 && req->resid_len <= bufflen))
+ memset(buffer + (bufflen - req->resid_len), 0, req->resid_len);
if (resid)
- *resid = req->data_len;
+ *resid = req->resid_len;
ret = req->errors;
out:
blk_put_request(req);
}
EXPORT_SYMBOL(scsi_execute_req);
-struct scsi_io_context {
- void *data;
- void (*done)(void *data, char *sense, int result, int resid);
- char sense[SCSI_SENSE_BUFFERSIZE];
-};
-
-static struct kmem_cache *scsi_io_context_cache;
-
-static void scsi_end_async(struct request *req, int uptodate)
-{
- struct scsi_io_context *sioc = req->end_io_data;
-
- if (sioc->done)
- sioc->done(sioc->data, sioc->sense, req->errors, req->data_len);
-
- kmem_cache_free(scsi_io_context_cache, sioc);
- __blk_put_request(req->q, req);
-}
-
-static int scsi_merge_bio(struct request *rq, struct bio *bio)
-{
- struct request_queue *q = rq->q;
-
- bio->bi_flags &= ~(1 << BIO_SEG_VALID);
- if (rq_data_dir(rq) == WRITE)
- bio->bi_rw |= (1 << BIO_RW);
- blk_queue_bounce(q, &bio);
-
- return blk_rq_append_bio(q, rq, bio);
-}
-
-static void scsi_bi_endio(struct bio *bio, int error)
-{
- bio_put(bio);
-}
-
-/**
- * scsi_req_map_sg - map a scatterlist into a request
- * @rq: request to fill
- * @sgl: scatterlist
- * @nsegs: number of elements
- * @bufflen: len of buffer
- * @gfp: memory allocation flags
- *
- * scsi_req_map_sg maps a scatterlist into a request so that the
- * request can be sent to the block layer. We do not trust the scatterlist
- * sent to use, as some ULDs use that struct to only organize the pages.
- */
-static int scsi_req_map_sg(struct request *rq, struct scatterlist *sgl,
- int nsegs, unsigned bufflen, gfp_t gfp)
-{
- struct request_queue *q = rq->q;
- int nr_pages = (bufflen + sgl[0].offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
- unsigned int data_len = bufflen, len, bytes, off;
- struct scatterlist *sg;
- struct page *page;
- struct bio *bio = NULL;
- int i, err, nr_vecs = 0;
-
- for_each_sg(sgl, sg, nsegs, i) {
- page = sg_page(sg);
- off = sg->offset;
- len = sg->length;
-
- while (len > 0 && data_len > 0) {
- /*
- * sg sends a scatterlist that is larger than
- * the data_len it wants transferred for certain
- * IO sizes
- */
- bytes = min_t(unsigned int, len, PAGE_SIZE - off);
- bytes = min(bytes, data_len);
-
- if (!bio) {
- nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
- nr_pages -= nr_vecs;
-
- bio = bio_alloc(gfp, nr_vecs);
- if (!bio) {
- err = -ENOMEM;
- goto free_bios;
- }
- bio->bi_end_io = scsi_bi_endio;
- }
-
- if (bio_add_pc_page(q, bio, page, bytes, off) !=
- bytes) {
- bio_put(bio);
- err = -EINVAL;
- goto free_bios;
- }
-
- if (bio->bi_vcnt >= nr_vecs) {
- err = scsi_merge_bio(rq, bio);
- if (err) {
- bio_endio(bio, 0);
- goto free_bios;
- }
- bio = NULL;
- }
-
- page++;
- len -= bytes;
- data_len -=bytes;
- off = 0;
- }
- }
-
- rq->buffer = rq->data = NULL;
- rq->data_len = bufflen;
- return 0;
-
-free_bios:
- while ((bio = rq->bio) != NULL) {
- rq->bio = bio->bi_next;
- /*
- * call endio instead of bio_put incase it was bounced
- */
- bio_endio(bio, 0);
- }
-
- return err;
-}
-
-/**
- * scsi_execute_async - insert request
- * @sdev: scsi device
- * @cmd: scsi command
- * @cmd_len: length of scsi cdb
- * @data_direction: DMA_TO_DEVICE, DMA_FROM_DEVICE, or DMA_NONE
- * @buffer: data buffer (this can be a kernel buffer or scatterlist)
- * @bufflen: len of buffer
- * @use_sg: if buffer is a scatterlist this is the number of elements
- * @timeout: request timeout in seconds
- * @retries: number of times to retry request
- * @privdata: data passed to done()
- * @done: callback function when done
- * @gfp: memory allocation flags
- */
-int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
- int cmd_len, int data_direction, void *buffer, unsigned bufflen,
- int use_sg, int timeout, int retries, void *privdata,
- void (*done)(void *, char *, int, int), gfp_t gfp)
-{
- struct request *req;
- struct scsi_io_context *sioc;
- int err = 0;
- int write = (data_direction == DMA_TO_DEVICE);
-
- sioc = kmem_cache_zalloc(scsi_io_context_cache, gfp);
- if (!sioc)
- return DRIVER_ERROR << 24;
-
- req = blk_get_request(sdev->request_queue, write, gfp);
- if (!req)
- goto free_sense;
- req->cmd_type = REQ_TYPE_BLOCK_PC;
- req->cmd_flags |= REQ_QUIET;
-
- if (use_sg)
- err = scsi_req_map_sg(req, buffer, use_sg, bufflen, gfp);
- else if (bufflen)
- err = blk_rq_map_kern(req->q, req, buffer, bufflen, gfp);
-
- if (err)
- goto free_req;
-
- req->cmd_len = cmd_len;
- memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
- memcpy(req->cmd, cmd, req->cmd_len);
- req->sense = sioc->sense;
- req->sense_len = 0;
- req->timeout = timeout;
- req->retries = retries;
- req->end_io_data = sioc;
-
- sioc->data = privdata;
- sioc->done = done;
-
- blk_execute_rq_nowait(req->q, NULL, req, 1, scsi_end_async);
- return 0;
-
-free_req:
- blk_put_request(req);
-free_sense:
- kmem_cache_free(scsi_io_context_cache, sioc);
- return DRIVER_ERROR << 24;
-}
-EXPORT_SYMBOL_GPL(scsi_execute_async);
-
/*
* Function: scsi_init_cmd_errh()
*
scsi_run_queue(sdev->request_queue);
}
+static void __scsi_release_buffers(struct scsi_cmnd *, int);
+
/*
* Function: scsi_end_request()
*
* to queue the remainder of them.
*/
if (blk_end_request(req, error, bytes)) {
- int leftover = (req->hard_nr_sectors << 9);
-
- if (blk_pc_request(req))
- leftover = req->data_len;
-
/* kill remainder if no retrys */
if (error && scsi_noretry_cmd(cmd))
- blk_end_request(req, error, leftover);
+ blk_end_request_all(req, error);
else {
if (requeue) {
/*
* leftovers in the front of the
* queue, and goose the queue again.
*/
+ scsi_release_buffers(cmd);
scsi_requeue_command(q, cmd);
cmd = NULL;
}
* This will goose the queue request function at the end, so we don't
* need to worry about launching another command.
*/
+ __scsi_release_buffers(cmd, 0);
scsi_next_command(cmd);
return NULL;
}
__sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, scsi_sg_free);
}
-/*
- * Function: scsi_release_buffers()
- *
- * Purpose: Completion processing for block device I/O requests.
- *
- * Arguments: cmd - command that we are bailing.
- *
- * Lock status: Assumed that no lock is held upon entry.
- *
- * Returns: Nothing
- *
- * Notes: In the event that an upper level driver rejects a
- * command, we must release resources allocated during
- * the __init_io() function. Primarily this would involve
- * the scatter-gather table, and potentially any bounce
- * buffers.
- */
-void scsi_release_buffers(struct scsi_cmnd *cmd)
+static void __scsi_release_buffers(struct scsi_cmnd *cmd, int do_bidi_check)
{
+
if (cmd->sdb.table.nents)
scsi_free_sgtable(&cmd->sdb);
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
- if (scsi_bidi_cmnd(cmd)) {
+ if (do_bidi_check && scsi_bidi_cmnd(cmd)) {
struct scsi_data_buffer *bidi_sdb =
cmd->request->next_rq->special;
scsi_free_sgtable(bidi_sdb);
if (scsi_prot_sg_count(cmd))
scsi_free_sgtable(cmd->prot_sdb);
}
-EXPORT_SYMBOL(scsi_release_buffers);
/*
- * Bidi commands Must be complete as a whole, both sides at once.
- * If part of the bytes were written and lld returned
- * scsi_in()->resid and/or scsi_out()->resid this information will be left
- * in req->data_len and req->next_rq->data_len. The upper-layer driver can
- * decide what to do with this information.
+ * Function: scsi_release_buffers()
+ *
+ * Purpose: Completion processing for block device I/O requests.
+ *
+ * Arguments: cmd - command that we are bailing.
+ *
+ * Lock status: Assumed that no lock is held upon entry.
+ *
+ * Returns: Nothing
+ *
+ * Notes: In the event that an upper level driver rejects a
+ * command, we must release resources allocated during
+ * the __init_io() function. Primarily this would involve
+ * the scatter-gather table, and potentially any bounce
+ * buffers.
*/
-static void scsi_end_bidi_request(struct scsi_cmnd *cmd)
+void scsi_release_buffers(struct scsi_cmnd *cmd)
{
- struct request *req = cmd->request;
- unsigned int dlen = req->data_len;
- unsigned int next_dlen = req->next_rq->data_len;
-
- req->data_len = scsi_out(cmd)->resid;
- req->next_rq->data_len = scsi_in(cmd)->resid;
-
- /* The req and req->next_rq have not been completed */
- BUG_ON(blk_end_bidi_request(req, 0, dlen, next_dlen));
-
- scsi_release_buffers(cmd);
-
- /*
- * This will goose the queue request function at the end, so we don't
- * need to worry about launching another command.
- */
- scsi_next_command(cmd);
+ __scsi_release_buffers(cmd, 1);
}
+EXPORT_SYMBOL(scsi_release_buffers);
/*
* Function: scsi_io_completion()
void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
{
int result = cmd->result;
- int this_count;
struct request_queue *q = cmd->device->request_queue;
struct request *req = cmd->request;
int error = 0;
if (!sense_deferred)
error = -EIO;
}
+
+ req->resid_len = scsi_get_resid(cmd);
+
if (scsi_bidi_cmnd(cmd)) {
- /* will also release_buffers */
- scsi_end_bidi_request(cmd);
+ /*
+ * Bidi commands Must be complete as a whole,
+ * both sides at once.
+ */
+ req->next_rq->resid_len = scsi_in(cmd)->resid;
+
+ blk_end_request_all(req, 0);
+
+ scsi_release_buffers(cmd);
+ scsi_next_command(cmd);
return;
}
- req->data_len = scsi_get_resid(cmd);
}
BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */
- scsi_release_buffers(cmd);
/*
* Next deal with any sectors which we were able to correctly
* handle.
*/
- SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, "
+ SCSI_LOG_HLCOMPLETE(1, printk("%u sectors total, "
"%d bytes done.\n",
- req->nr_sectors, good_bytes));
+ blk_rq_sectors(req), good_bytes));
- /* A number of bytes were successfully read. If there
+ /*
+ * Recovered errors need reporting, but they're always treated
+ * as success, so fiddle the result code here. For BLOCK_PC
+ * we already took a copy of the original into rq->errors which
+ * is what gets returned to the user
+ */
+ if (sense_valid && sshdr.sense_key == RECOVERED_ERROR) {
+ if (!(req->cmd_flags & REQ_QUIET))
+ scsi_print_sense("", cmd);
+ result = 0;
+ /* BLOCK_PC may have set error */
+ error = 0;
+ }
+
+ /*
+ * A number of bytes were successfully read. If there
* are leftovers and there is some kind of error
* (result != 0), retry the rest.
*/
if (scsi_end_request(cmd, error, good_bytes, result == 0) == NULL)
return;
- this_count = blk_rq_bytes(req);
+
+ error = -EIO;
if (host_byte(result) == DID_RESET) {
/* Third party bus reset or reset for error recovery
/* This will issue a new 6-byte command. */
cmd->device->use_10_for_rw = 0;
action = ACTION_REPREP;
+ } else if (sshdr.asc == 0x10) /* DIX */ {
+ description = "Host Data Integrity Failure";
+ action = ACTION_FAIL;
+ error = -EILSEQ;
} else
action = ACTION_FAIL;
break;
case ABORTED_COMMAND:
+ action = ACTION_FAIL;
if (sshdr.asc == 0x10) { /* DIF */
- action = ACTION_FAIL;
- description = "Data Integrity Failure";
- } else
- action = ACTION_RETRY;
+ description = "Target Data Integrity Failure";
+ error = -EILSEQ;
+ }
break;
case NOT_READY:
/* If the device is in the process of becoming
case 0x07: /* operation in progress */
case 0x08: /* Long write in progress */
case 0x09: /* self test in progress */
+ case 0x14: /* space allocation in progress */
action = ACTION_DELAYED_RETRY;
break;
default:
switch (action) {
case ACTION_FAIL:
/* Give up and fail the remainder of the request */
+ scsi_release_buffers(cmd);
if (!(req->cmd_flags & REQ_QUIET)) {
if (description)
scmd_printk(KERN_INFO, cmd, "%s\n",
scsi_print_result(cmd);
if (driver_byte(result) & DRIVER_SENSE)
scsi_print_sense("", cmd);
+ scsi_print_command(cmd);
}
- blk_end_request(req, -EIO, blk_rq_bytes(req));
- scsi_next_command(cmd);
+ if (blk_end_request_err(req, error))
+ scsi_requeue_command(q, cmd);
+ else
+ scsi_next_command(cmd);
break;
case ACTION_REPREP:
/* Unprep the request and put it back at the head of the queue.
* A new command will be prepared and issued.
*/
+ scsi_release_buffers(cmd);
scsi_requeue_command(q, cmd);
break;
case ACTION_RETRY:
count = blk_rq_map_sg(req->q, req, sdb->table.sgl);
BUG_ON(count > sdb->table.nents);
sdb->table.nents = count;
- if (blk_pc_request(req))
- sdb->length = req->data_len;
- else
- sdb->length = req->nr_sectors << 9;
+ sdb->length = blk_rq_bytes(req);
return BLKPREP_OK;
}
if (unlikely(ret))
return ret;
} else {
- BUG_ON(req->data_len);
- BUG_ON(req->data);
+ BUG_ON(blk_rq_bytes(req));
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
req->buffer = NULL;
}
cmd->cmd_len = req->cmd_len;
- if (!req->data_len)
+ if (!blk_rq_bytes(req))
cmd->sc_data_direction = DMA_NONE;
else if (rq_data_dir(req) == WRITE)
cmd->sc_data_direction = DMA_TO_DEVICE;
else
cmd->sc_data_direction = DMA_FROM_DEVICE;
- cmd->transfersize = req->data_len;
+ cmd->transfersize = blk_rq_bytes(req);
cmd->allowed = req->retries;
return BLKPREP_OK;
}
break;
case BLKPREP_DEFER:
/*
- * If we defer, the elv_next_request() returns NULL, but the
+ * If we defer, the blk_peek_request() returns NULL, but the
* queue must be restarted, so we plug here if no returning
* command will automatically do that.
*/
ret = scsi_setup_blk_pc_cmnd(sdev, req);
return scsi_prep_return(q, req, ret);
}
+EXPORT_SYMBOL(scsi_prep_fn);
/*
* scsi_dev_queue_ready: if we can send requests to sdev, return 1 else
if (--starget->target_blocked == 0) {
SCSI_LOG_MLQUEUE(3, starget_printk(KERN_INFO, starget,
"unblocking target at zero depth\n"));
- } else {
- blk_plug_device(sdev->request_queue);
+ } else
return 0;
- }
}
if (scsi_target_is_busy(starget)) {
static void scsi_kill_request(struct request *req, struct request_queue *q)
{
struct scsi_cmnd *cmd = req->special;
- struct scsi_device *sdev = cmd->device;
- struct scsi_target *starget = scsi_target(sdev);
- struct Scsi_Host *shost = sdev->host;
+ struct scsi_device *sdev;
+ struct scsi_target *starget;
+ struct Scsi_Host *shost;
- blkdev_dequeue_request(req);
+ blk_start_request(req);
if (unlikely(cmd == NULL)) {
printk(KERN_CRIT "impossible request in %s.\n",
BUG();
}
+ sdev = cmd->device;
+ starget = scsi_target(sdev);
+ shost = sdev->host;
scsi_init_cmd_errh(cmd);
cmd->result = DID_NO_CONNECT << 16;
atomic_inc(&cmd->device->iorequest_cnt);
if (!sdev) {
printk("scsi: killing requests for dead queue\n");
- while ((req = elv_next_request(q)) != NULL)
+ while ((req = blk_peek_request(q)) != NULL)
scsi_kill_request(req, q);
return;
}
* that the request is fully prepared even if we cannot
* accept it.
*/
- req = elv_next_request(q);
+ req = blk_peek_request(q);
if (!req || !scsi_dev_queue_ready(q, sdev))
break;
* Remove the request from the request list.
*/
if (!(blk_queue_tagged(q) && !blk_queue_start_tag(q, req)))
- blkdev_dequeue_request(req);
+ blk_start_request(req);
sdev->device_busy++;
spin_unlock(q->queue_lock);
{
int i;
- scsi_io_context_cache = kmem_cache_create("scsi_io_context",
- sizeof(struct scsi_io_context),
- 0, 0, NULL);
- if (!scsi_io_context_cache) {
- printk(KERN_ERR "SCSI: can't init scsi io context cache\n");
- return -ENOMEM;
- }
-
scsi_sdb_cache = kmem_cache_create("scsi_data_buffer",
sizeof(struct scsi_data_buffer),
0, 0, NULL);
if (!scsi_sdb_cache) {
printk(KERN_ERR "SCSI: can't init scsi sdb cache\n");
- goto cleanup_io_context;
+ return -ENOMEM;
}
for (i = 0; i < SG_MEMPOOL_NR; i++) {
kmem_cache_destroy(sgp->slab);
}
kmem_cache_destroy(scsi_sdb_cache);
-cleanup_io_context:
- kmem_cache_destroy(scsi_io_context_cache);
return -ENOMEM;
}
{
int i;
- kmem_cache_destroy(scsi_io_context_cache);
kmem_cache_destroy(scsi_sdb_cache);
for (i = 0; i < SG_MEMPOOL_NR; i++) {
scsi_internal_device_unblock(struct scsi_device *sdev)
{
struct request_queue *q = sdev->request_queue;
- int err;
unsigned long flags;
/*
* Try to transition the scsi device to SDEV_RUNNING
* and goose the device queue if successful.
*/
- err = scsi_device_set_state(sdev, SDEV_RUNNING);
- if (err) {
- err = scsi_device_set_state(sdev, SDEV_CREATED);
-
- if (err)
- return err;
- }
+ if (sdev->sdev_state == SDEV_BLOCK)
+ sdev->sdev_state = SDEV_RUNNING;
+ else if (sdev->sdev_state == SDEV_CREATED_BLOCK)
+ sdev->sdev_state = SDEV_CREATED;
+ else
+ return -EINVAL;
spin_lock_irqsave(q->queue_lock, flags);
blk_start_queue(q);