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authorNicholas Bellinger <nab@linux-iscsi.org>2015-03-25 01:02:57 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2015-06-01 00:24:00 -0700
commit80bfdfa92481d431b199eff72788588d13a3988f (patch)
treed3549786f0be21fb1f1f6abbdf1190e9cc4aaece /include/target
parent29a05deebf6c2e3010934fb78ee65cab3d329470 (diff)
target/pr: Use atomic bitop for se_dev_entry->deve_flags reservation check
This patch converts the core_scsi3_pr_seq_non_holder() check for non reservation holding registrations to use an atomic bitop in ->deve_flags to determine if a registration is currently active. It also includes associated a set_bit() in __core_scsi3_add_registration() and clear_bit() in __core_scsi3_free_registration(), if se_dev_entry still exists, and has not already been released via se_dev_entry shutdown path in core_disable_device_list_for_node(). Also, clear_bit in core_disable_device_list_for_node as well to ensure the read-critical path in core_scsi3_pr_seq_non_holder() picks up the new state, preceeding the final kfree_rcu() call. Reported-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_base.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index b518523cba7b..508528a5e927 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -638,7 +638,6 @@ struct se_lun_acl {
};
struct se_dev_entry {
- bool def_pr_registered;
/* See transport_lunflags_table */
u32 lun_flags;
u32 mapped_lun;
@@ -655,6 +654,8 @@ struct se_dev_entry {
struct se_lun_acl __rcu *se_lun_acl;
spinlock_t ua_lock;
struct se_lun __rcu *se_lun;
+#define DEF_PR_REG_ACTIVE 1
+ unsigned long deve_flags;
struct list_head alua_port_list;
struct list_head ua_list;
struct hlist_node link;

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