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authorMike Christie <michaelc@cs.wisc.edu>2005-11-11 06:31:41 -0500
committerJames Bottomley <jejb@mulgrave.(none)>2005-12-14 22:09:09 -0500
commitaa7b5cd750c766f66a92c9f78ba176bc77512b7e (patch)
treef9825729d1928b7171c09fcec6a4fc45f759e168 /drivers/scsi/scsi_lib.c
parent0d95716d6a1308c465d8c17ed1a217628936bb0c (diff)
[SCSI] add kmemcache for scsi_io_context
Add kmemcache of scsi io contexts. In the future when we finalize on where these functions will live we can add a mempool for it and do a bioset for out REQ_BLOCK_PC bios. This is needed becuase the dm-multipath handlers will want to use the scsi_exectute* functions for failover and we cannot have them and the bio device allocating from the same mempool. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 3e136bfe4219..54a72f197487 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -306,6 +306,8 @@ struct scsi_io_context {
306 char sense[SCSI_SENSE_BUFFERSIZE]; 306 char sense[SCSI_SENSE_BUFFERSIZE];
307}; 307};
308 308
309static kmem_cache_t *scsi_io_context_cache;
310
309static void scsi_end_async(struct request *req) 311static void scsi_end_async(struct request *req)
310{ 312{
311 struct scsi_io_context *sioc = req->end_io_data; 313 struct scsi_io_context *sioc = req->end_io_data;
@@ -313,7 +315,7 @@ static void scsi_end_async(struct request *req)
313 if (sioc->done) 315 if (sioc->done)
314 sioc->done(sioc->data, sioc->sense, req->errors, req->data_len); 316 sioc->done(sioc->data, sioc->sense, req->errors, req->data_len);
315 317
316 kfree(sioc); 318 kmem_cache_free(scsi_io_context_cache, sioc);
317 __blk_put_request(req->q, req); 319 __blk_put_request(req->q, req);
318} 320}
319 321
@@ -452,9 +454,10 @@ int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
452 int err = 0; 454 int err = 0;
453 int write = (data_direction == DMA_TO_DEVICE); 455 int write = (data_direction == DMA_TO_DEVICE);
454 456
455 sioc = kzalloc(sizeof(*sioc), gfp); 457 sioc = kmem_cache_alloc(scsi_io_context_cache, gfp);
456 if (!sioc) 458 if (!sioc)
457 return DRIVER_ERROR << 24; 459 return DRIVER_ERROR << 24;
460 memset(sioc, 0, sizeof(*sioc));
458 461
459 req = blk_get_request(sdev->request_queue, write, gfp); 462 req = blk_get_request(sdev->request_queue, write, gfp);
460 if (!req) 463 if (!req)
@@ -1765,6 +1768,14 @@ int __init scsi_init_queue(void)
1765{ 1768{
1766 int i; 1769 int i;
1767 1770
1771 scsi_io_context_cache = kmem_cache_create("scsi_io_context",
1772 sizeof(struct scsi_io_context),
1773 0, 0, NULL, NULL);
1774 if (!scsi_io_context_cache) {
1775 printk(KERN_ERR "SCSI: can't init scsi io context cache\n");
1776 return -ENOMEM;
1777 }
1778
1768 for (i = 0; i < SG_MEMPOOL_NR; i++) { 1779 for (i = 0; i < SG_MEMPOOL_NR; i++) {
1769 struct scsi_host_sg_pool *sgp = scsi_sg_pools + i; 1780 struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
1770 int size = sgp->size * sizeof(struct scatterlist); 1781 int size = sgp->size * sizeof(struct scatterlist);
@@ -1792,6 +1803,8 @@ void scsi_exit_queue(void)
1792{ 1803{
1793 int i; 1804 int i;
1794 1805
1806 kmem_cache_destroy(scsi_io_context_cache);
1807
1795 for (i = 0; i < SG_MEMPOOL_NR; i++) { 1808 for (i = 0; i < SG_MEMPOOL_NR; i++) {
1796 struct scsi_host_sg_pool *sgp = scsi_sg_pools + i; 1809 struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
1797 mempool_destroy(sgp->pool); 1810 mempool_destroy(sgp->pool);