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target: Add target_alloc_session() helper function

Browse source 
Based on HCH's original patch, this adds a full version to
support percpu-ida tag pre-allocation and callback function
pointer into fabric driver code to complete session setup.

Reported-by: Christoph Hellwig <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Andy Grover <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Nicholas Bellinger 2016-01-09 05:29:24 -08:00
commit 7861728d42
2 changed files with 62 additions and 0 deletions
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56
drivers/target/target_core_transport.c
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@ -281,6 +281,17 @@ struct se_session *transport_init_session_tags(unsigned int tag_num,
struct se_session *se_sess;
int rc;
if (tag_num != 0 && !tag_size) {
pr_err("init_session_tags called with percpu-ida tag_num:"
" %u, but zero tag_size\n", tag_num);
return ERR_PTR(-EINVAL);
}
if (!tag_num && tag_size) {
pr_err("init_session_tags called with percpu-ida tag_size:"
" %u, but zero tag_num\n", tag_size);
return ERR_PTR(-EINVAL);
}
se_sess = transport_init_session(sup_prot_ops);
if (IS_ERR(se_sess))
return se_sess;
@ -374,6 +385,51 @@ void transport_register_session(
}
EXPORT_SYMBOL(transport_register_session);
struct se_session *
target_alloc_session(struct se_portal_group *tpg,
unsigned int tag_num, unsigned int tag_size,
enum target_prot_op prot_op,
const char *initiatorname, void *private,
int (*callback)(struct se_portal_group *,
struct se_session *, void *))
{
struct se_session *sess;
/*
* If the fabric driver is using percpu-ida based pre allocation
* of I/O descriptor tags, go ahead and perform that setup now..
*/
if (tag_num != 0)
sess = transport_init_session_tags(tag_num, tag_size, prot_op);
else
sess = transport_init_session(prot_op);
if (IS_ERR(sess))
return sess;
sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
(unsigned char *)initiatorname);
if (!sess->se_node_acl) {
transport_free_session(sess);
return ERR_PTR(-EACCES);
}
/*
* Go ahead and perform any remaining fabric setup that is
* required before transport_register_session().
*/
if (callback != NULL) {
int rc = callback(tpg, sess, private);
if (rc) {
transport_free_session(sess);
return ERR_PTR(rc);
}
}
transport_register_session(tpg, sess->se_node_acl, sess, private);
return sess;
}
EXPORT_SYMBOL(target_alloc_session);
static void target_release_session(struct kref *kref)
{
struct se_session *se_sess = container_of(kref,