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[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>
This commit is contained in:
Mike Christie 2005-11-11 05:31:41 -06:00 committed by James Bottomley
parent 0d95716d6a
commit aa7b5cd750
1 changed files with 15 additions and 2 deletions
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17
drivers/scsi/scsi_lib.c
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@ -306,6 +306,8 @@ struct scsi_io_context {
char sense[SCSI_SENSE_BUFFERSIZE];
};
static kmem_cache_t *scsi_io_context_cache;
static void scsi_end_async(struct request *req)
{
struct scsi_io_context *sioc = req->end_io_data;
@ -313,7 +315,7 @@ static void scsi_end_async(struct request *req)
if (sioc->done)
sioc->done(sioc->data, sioc->sense, req->errors, req->data_len);
kfree(sioc);
kmem_cache_free(scsi_io_context_cache, sioc);
__blk_put_request(req->q, req);
}
@ -452,9 +454,10 @@ int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
int err = 0;
int write = (data_direction == DMA_TO_DEVICE);
sioc = kzalloc(sizeof(*sioc), gfp);
sioc = kmem_cache_alloc(scsi_io_context_cache, gfp);
if (!sioc)
return DRIVER_ERROR << 24;
memset(sioc, 0, sizeof(*sioc));
req = blk_get_request(sdev->request_queue, write, gfp);
if (!req)
@ -1765,6 +1768,14 @@ int __init scsi_init_queue(void)
{
int i;
scsi_io_context_cache = kmem_cache_create("scsi_io_context",
sizeof(struct scsi_io_context),
0, 0, NULL, NULL);
if (!scsi_io_context_cache) {
printk(KERN_ERR "SCSI: can't init scsi io context cache\n");
return -ENOMEM;
}
for (i = 0; i < SG_MEMPOOL_NR; i++) {
struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
int size = sgp->size * sizeof(struct scatterlist);
@ -1792,6 +1803,8 @@ void scsi_exit_queue(void)
{
int i;
kmem_cache_destroy(scsi_io_context_cache);
for (i = 0; i < SG_MEMPOOL_NR; i++) {
struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
mempool_destroy(sgp->pool);