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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-05-19 00:03:07 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-06-01 00:27:38 -0700 |
| commit | 4cc987eaff9144182cde88d6d132420c28d3f81b (patch) | |
| tree | 15cf7d432599e1e09446462968ef01c4d10a087e /include | |
| parent | adf653f92f38e80a78bb77e912d49bcc8055330f (diff) | |
| download | linux-4cc987eaff9144182cde88d6d132420c28d3f81b.tar.gz linux-4cc987eaff9144182cde88d6d132420c28d3f81b.tar.bz2 linux-4cc987eaff9144182cde88d6d132420c28d3f81b.zip | |
target: Drop lun_sep_lock for se_lun->lun_se_dev RCU usage
With se_port and t10_alua_tg_pt_gp_member being absored into se_lun,
there is no need for an extra lock to protect se_lun->lun_se_dev
assignment.
This patch also converts backend drivers to use call_rcu() release
to allow any se_device readers to complete. The call_rcu() instead
of kfree_rcu() is required here because se_device is embedded into
the backend driver specific structure.
Also, convert se_lun->lun_stats to use atomic_long_t within the
target_complete_ok_work() completion callback, and add FIXME for
transport_lookup_tmr_lun() with se_lun->lun_ref.
Finally, update sbp_update_unit_directory() special case usage with
proper rcu_dereference_raw() and configfs symlink comment.
Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Chris Boot <bootc@bootc.net>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/target/target_core_base.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 1927dd5947a7..b82a989a4d3b 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -690,9 +690,9 @@ struct se_port_stat_grps { }; struct scsi_port_stats { - u32 cmd_pdus; - u64 tx_data_octets; - u64 rx_data_octets; + atomic_long_t cmd_pdus; + atomic_long_t tx_data_octets; + atomic_long_t rx_data_octets; }; struct se_lun { @@ -705,7 +705,6 @@ struct se_lun { u32 unpacked_lun; u32 lun_index; atomic_t lun_acl_count; - spinlock_t lun_sep_lock; struct se_device __rcu *lun_se_dev; struct list_head lun_deve_list; @@ -818,6 +817,9 @@ struct se_device { struct se_lun xcopy_lun; /* Protection Information */ int prot_length; + /* For se_lun->lun_se_dev RCU read-side critical access */ + u32 hba_index; + struct rcu_head rcu_head; }; struct se_hba { |