diff options
author | Ilias Tsitsimpis <iliastsi@arrikto.com> | 2015-03-26 16:12:42 +0100 |
---|---|---|
committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-03-26 22:49:51 +0100 |
commit | e673dc920b805f08429e122321f8355cb97c2120 (patch) | |
tree | 872ce8724896451273bc0ae2eb23c66eb9a146b7 | |
parent | iscsi-target: Drop legacy iscsi_target_tq.c logic (diff) | |
download | linux-e673dc920b805f08429e122321f8355cb97c2120.tar.xz linux-e673dc920b805f08429e122321f8355cb97c2120.zip |
target: Better handling of AllRegistrants reservations
Fix AllRegistrants reservations in register_and_move() function where
the code didn't handle all of the registered devices as reservation
holders, resulting in the wrong warning message being displayed.
At the same time, introduce a helper function named
'is_reservation_holder()' that properly checks if a device is a
reservation holder, taking into account the reservation type. This
function cleans up the code and improves readability.
Signed-off-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
Signed-off-by: Vangelis Koukis <vkoukis@arrikto.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r-- | drivers/target/target_core_pr.c | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index 2de6fb8cee8d..7436fdaaad12 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -78,6 +78,22 @@ enum preempt_type { static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, struct t10_pr_registration *, int, int); +static int is_reservation_holder( + struct t10_pr_registration *pr_res_holder, + struct t10_pr_registration *pr_reg) +{ + int pr_res_type; + + if (pr_res_holder) { + pr_res_type = pr_res_holder->pr_res_type; + + return pr_res_holder == pr_reg || + pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || + pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; + } + return 0; +} + static sense_reason_t target_scsi2_reservation_check(struct se_cmd *cmd) { @@ -2287,7 +2303,6 @@ core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) spin_lock(&dev->dev_reservation_lock); pr_res_holder = dev->dev_pr_res_holder; if (pr_res_holder) { - int pr_res_type = pr_res_holder->pr_res_type; /* * From spc4r17 Section 5.7.9: Reserving: * @@ -2298,9 +2313,7 @@ core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) * the logical unit, then the command shall be completed with * RESERVATION CONFLICT status. */ - if ((pr_res_holder != pr_reg) && - (pr_res_type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) && - (pr_res_type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { + if (!is_reservation_holder(pr_res_holder, pr_reg)) { struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl; pr_err("SPC-3 PR: Attempted RESERVE from" " [%s]: %s while reservation already held by" @@ -2477,7 +2490,6 @@ core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, struct se_lun *se_lun = cmd->se_lun; struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder; struct t10_reservation *pr_tmpl = &dev->t10_pr; - int all_reg = 0; sense_reason_t ret = 0; if (!se_sess || !se_lun) { @@ -2514,13 +2526,9 @@ core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, spin_unlock(&dev->dev_reservation_lock); goto out_put_pr_reg; } - if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || - (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) - all_reg = 1; - if ((all_reg == 0) && (pr_res_holder != pr_reg)) { + if (!is_reservation_holder(pr_res_holder, pr_reg)) { /* - * Non 'All Registrants' PR Type cases.. * Release request from a registered I_T nexus that is not a * persistent reservation holder. return GOOD status. */ @@ -3375,7 +3383,7 @@ after_iport_check: * From spc4r17 section 5.7.8 Table 50 -- * Register behaviors for a REGISTER AND MOVE service action */ - if (pr_res_holder != pr_reg) { + if (!is_reservation_holder(pr_res_holder, pr_reg)) { pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T" " Nexus is not reservation holder\n"); spin_unlock(&dev->dev_reservation_lock); |