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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-03-25 01:02:57 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-06-01 00:24:00 -0700 |
| commit | 80bfdfa92481d431b199eff72788588d13a3988f (patch) | |
| tree | d3549786f0be21fb1f1f6abbdf1190e9cc4aaece /include/target | |
| parent | 29a05deebf6c2e3010934fb78ee65cab3d329470 (diff) | |
| download | linux-80bfdfa92481d431b199eff72788588d13a3988f.tar.bz2 | |
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.h | 3 |
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; |