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authorNicholas Bellinger <nab@linux-iscsi.org>2012-05-16 22:02:34 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2012-05-17 00:45:58 -0700
commit5b9a4d7280e160982a8ea37bc03619f53b5c98b7 (patch)
tree3d7fbce10e7379097f34276b6a8a7d090d4dc813 /drivers/target/target_core_alua.h
parentba539743b70cd160c84bab1c82910d0789b820f8 (diff)
downloadlinux-5b9a4d7280e160982a8ea37bc03619f53b5c98b7.tar.gz
target: Add MI_REPORT_TARGET_PGS ext. header + implict_trans_secs attribute
This patch adds support for ALUA MI_REPORT_TARGET_PGS extended header format defined within SPC-4. It changes target core ALUA emulation logic within target_emulate_report_target_port_groups() to support both the extended and original length only header formats. It includes adding a new 'implict_trans_secs' attribute for each ALUA target port group to control the value returned to the application client for an recommended implict translation timeout in seconds. By default this value is currently set to zero, and limited up to 255 by virtue of using a single byte in the extended header format. This value is used by target_emulate_report_target_port_groups() within the extended header logic to set IMPLICIT TRANSITION TIME as defined by spc4r30. Cc: Hannes Reinecke <hare@suse.de> Cc: Rob Evers <revers@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_alua.h')
-rw-r--r--drivers/target/target_core_alua.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/target/target_core_alua.h b/drivers/target/target_core_alua.h
index e2645432475..f920c170d47 100644
--- a/drivers/target/target_core_alua.h
+++ b/drivers/target/target_core_alua.h
@@ -52,6 +52,12 @@
#define ALUA_DEFAULT_TRANS_DELAY_MSECS 0
#define ALUA_MAX_TRANS_DELAY_MSECS 30000 /* 30 seconds */
/*
+ * Used for the recommended application client implict transition timeout
+ * in seconds, returned by the REPORT_TARGET_PORT_GROUPS w/ extended header.
+ */
+#define ALUA_DEFAULT_IMPLICT_TRANS_SECS 0
+#define ALUA_MAX_IMPLICT_TRANS_SECS 255
+/*
* Used by core_alua_update_tpg_primary_metadata() and
* core_alua_update_tpg_secondary_metadata()
*/
@@ -107,6 +113,10 @@ extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
const char *, size_t);
+extern ssize_t core_alua_show_implict_trans_secs(struct t10_alua_tg_pt_gp *,
+ char *);
+extern ssize_t core_alua_store_implict_trans_secs(struct t10_alua_tg_pt_gp *,
+ const char *, size_t);
extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,