From 459f213ba162bd13e113d6f92a8fa6c780fd67ed Mon Sep 17 00:00:00 2001 From: Andy Grover Date: Thu, 16 May 2013 10:41:02 -0700 Subject: [PATCH] target: Allocate aptpl_buf inside update_and_write_aptpl() Instead of taking the buffer and length, update_and_write_aptpl() will allocate the buffer as needed, and then free it. Instead, the function takes an 'aptpl' boolean parameter. This enables us to remove memory alloc/frees from struct t10_pr_registration and other spots. There is a slight loss of functionality because each callsite doesn't get its own pr_debug any more, but this info can be cleaned via ftrace if necessary and I think the shorter code is worth it. Signed-off-by: Andy Grover Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_pr.c | 203 +++++++++----------------------------- include/target/target_core_base.h | 2 - 2 files changed, 48 insertions(+), 157 deletions(-) diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index c157b3f..915edaa 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -606,13 +606,6 @@ static struct t10_pr_registration *__core_scsi3_do_alloc_registration( return NULL; } - pr_reg->pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_ATOMIC); - if (!pr_reg->pr_aptpl_buf) { - pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n"); - kmem_cache_free(t10_pr_reg_cache, pr_reg); - return NULL; - } - INIT_LIST_HEAD(&pr_reg->pr_reg_list); INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list); @@ -803,7 +796,6 @@ int core_scsi3_alloc_aptpl_registration( pr_err("Unable to allocate struct t10_pr_registration\n"); return -ENOMEM; } - pr_reg->pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL); INIT_LIST_HEAD(&pr_reg->pr_reg_list); INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list); @@ -1272,7 +1264,6 @@ static void __core_scsi3_free_registration( if (!preempt_and_abort_list) { pr_reg->pr_reg_deve = NULL; pr_reg->pr_reg_nacl = NULL; - kfree(pr_reg->pr_aptpl_buf); kmem_cache_free(t10_pr_reg_cache, pr_reg); return; } @@ -1341,7 +1332,6 @@ void core_scsi3_free_all_registrations( list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list, pr_reg_aptpl_list) { list_del(&pr_reg->pr_reg_aptpl_list); - kfree(pr_reg->pr_aptpl_buf); kmem_cache_free(t10_pr_reg_cache, pr_reg); } spin_unlock(&pr_tmpl->aptpl_reg_lock); @@ -1814,7 +1804,6 @@ out: kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp); } - kfree(dest_pr_reg->pr_aptpl_buf); kmem_cache_free(t10_pr_reg_cache, dest_pr_reg); if (dest_local_nexus) @@ -1840,8 +1829,6 @@ static int core_scsi3_update_aptpl_buf( int reg_count = 0; int ret = 0; - memset(buf, 0, pr_aptpl_buf_len); - spin_lock(&dev->dev_reservation_lock); spin_lock(&dev->t10_pr.registration_lock); /* @@ -1965,31 +1952,45 @@ static int __core_scsi3_write_aptpl_to_file( return ret ? -EIO : 0; } -static int -core_scsi3_update_and_write_aptpl(struct se_device *dev, unsigned char *in_buf, - u32 in_pr_aptpl_buf_len) +/* + * Clear the APTPL metadata if APTPL has been disabled, otherwise + * write out the updated metadata to struct file for this SCSI device. + */ +static int core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl) { - unsigned char null_buf[64], *buf; - int ret; + int ret = 0; - /* - * Can be called with a NULL pointer from PROUT service action CLEAR - */ - if (!in_buf) { - snprintf(null_buf, 64, "No Registrations or Reservations\n"); - buf = null_buf; + if (!aptpl) { + char *null_buf = "No Registrations or Reservations\n"; + + ret = __core_scsi3_write_aptpl_to_file(dev, null_buf); + dev->t10_pr.pr_aptpl_active = 0; + pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n"); } else { - ret = core_scsi3_update_aptpl_buf(dev, in_buf, in_pr_aptpl_buf_len); - if (ret != 0) + int ret; + unsigned char *buf; + + buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN); + if (ret < 0) { + kfree(buf); return ret; - buf = in_buf; + } + + ret = __core_scsi3_write_aptpl_to_file(dev, buf); + if (ret != 0) { + pr_err("SPC-3 PR: Could not update APTPL\n"); + } else { + dev->t10_pr.pr_aptpl_active = 1; + pr_debug("SPC-3 PR: Set APTPL Bit Activated\n"); + } + kfree(buf); } - /* - * __core_scsi3_write_aptpl_to_file() will call strlen() - * on the passed buf to determine pr_aptpl_buf_len. - */ - return __core_scsi3_write_aptpl_to_file(dev, buf); + return ret; } static sense_reason_t @@ -2003,8 +2004,6 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, struct se_portal_group *se_tpg; struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e; struct t10_reservation *pr_tmpl = &dev->t10_pr; - /* Used for APTPL metadata w/ UNREGISTER */ - unsigned char *pr_aptpl_buf = NULL; unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL; sense_reason_t ret = TCM_NO_SENSE; int pr_holder = 0, type; @@ -2066,31 +2065,8 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, if (ret != 0) return ret; } - /* - * Nothing left to do for the APTPL=0 case. - */ - if (!aptpl) { - pr_tmpl->pr_aptpl_active = 0; - core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); - pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" - " REGISTER\n"); - return 0; - } - /* - * Locate the newly allocated local I_T Nexus *pr_reg, and - * update the APTPL metadata information using its - * preallocated *pr_reg->pr_aptpl_buf. - */ - pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, - se_sess->se_node_acl, se_sess); - - if (core_scsi3_update_and_write_aptpl(cmd->se_dev, - pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_tmpl->pr_aptpl_active = 1; - pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n"); - } - goto out_put_pr_reg; + return core_scsi3_update_and_write_aptpl(dev, aptpl); } /* @@ -2131,19 +2107,6 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, } /* - * Allocate APTPL metadata buffer used for UNREGISTER ops - */ - if (aptpl) { - pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL); - if (!pr_aptpl_buf) { - pr_err("Unable to allocate" - " pr_aptpl_buf\n"); - ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - goto out_put_pr_reg; - } - } - - /* * sa_res_key=0 Unregister Reservation Key for registered I_T * Nexus sa_res_key=1 Change Reservation Key for registered I_T * Nexus. @@ -2152,7 +2115,6 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, pr_holder = core_scsi3_check_implict_release( cmd->se_dev, pr_reg); if (pr_holder < 0) { - kfree(pr_aptpl_buf); ret = TCM_RESERVATION_CONFLICT; goto out_put_pr_reg; } @@ -2214,21 +2176,8 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, } spin_unlock(&pr_tmpl->registration_lock); - if (!aptpl) { - pr_tmpl->pr_aptpl_active = 0; - core_scsi3_update_and_write_aptpl(dev, NULL, 0); - pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" - " for UNREGISTER\n"); - return 0; - } - - if (!core_scsi3_update_and_write_aptpl(dev, pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_tmpl->pr_aptpl_active = 1; - pr_debug("SPC-3 PR: Set APTPL Bit Activated" - " for UNREGISTER\n"); - } - - goto out_free_aptpl_buf; + ret = core_scsi3_update_and_write_aptpl(dev, aptpl); + goto out_put_pr_reg; } /* @@ -2245,24 +2194,8 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key, pr_reg->pr_reg_nacl->initiatorname, pr_reg->pr_res_key, pr_reg->pr_res_generation); - if (!aptpl) { - pr_tmpl->pr_aptpl_active = 0; - core_scsi3_update_and_write_aptpl(dev, NULL, 0); - pr_debug("SPC-3 PR: Set APTPL Bit Deactivated" - " for REGISTER\n"); - ret = 0; - goto out_put_pr_reg; - } + ret = core_scsi3_update_and_write_aptpl(dev, aptpl); - if (!core_scsi3_update_and_write_aptpl(dev, pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_tmpl->pr_aptpl_active = 1; - pr_debug("SPC-3 PR: Set APTPL Bit Activated" - " for REGISTER\n"); - } - -out_free_aptpl_buf: - kfree(pr_aptpl_buf); - ret = 0; out_put_pr_reg: core_scsi3_put_pr_reg(pr_reg); return ret; @@ -2437,13 +2370,8 @@ core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key) i_buf); spin_unlock(&dev->dev_reservation_lock); - if (pr_tmpl->pr_aptpl_active) { - if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, - pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_debug("SPC-3 PR: Updated APTPL metadata" - " for RESERVE\n"); - } - } + if (pr_tmpl->pr_aptpl_active) + core_scsi3_update_and_write_aptpl(cmd->se_dev, true); ret = 0; out_put_pr_reg: @@ -2657,12 +2585,9 @@ core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope, spin_unlock(&pr_tmpl->registration_lock); write_aptpl: - if (pr_tmpl->pr_aptpl_active) { - if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, - pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n"); - } - } + if (pr_tmpl->pr_aptpl_active) + core_scsi3_update_and_write_aptpl(cmd->se_dev, true); + out_put_pr_reg: core_scsi3_put_pr_reg(pr_reg); return ret; @@ -2746,11 +2671,7 @@ core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key) pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n", cmd->se_tfo->get_fabric_name()); - if (pr_tmpl->pr_aptpl_active) { - core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); - pr_debug("SPC-3 PR: Updated APTPL metadata" - " for CLEAR\n"); - } + core_scsi3_update_and_write_aptpl(cmd->se_dev, false); core_scsi3_pr_generation(dev); return 0; @@ -2822,7 +2743,6 @@ static void core_scsi3_release_preempt_and_abort( pr_reg->pr_reg_deve = NULL; pr_reg->pr_reg_nacl = NULL; - kfree(pr_reg->pr_aptpl_buf); kmem_cache_free(t10_pr_reg_cache, pr_reg); } } @@ -2984,14 +2904,8 @@ core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, } spin_unlock(&dev->dev_reservation_lock); - if (pr_tmpl->pr_aptpl_active) { - if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, - pr_reg_n->pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_debug("SPC-3 PR: Updated APTPL" - " metadata for PREEMPT%s\n", (preempt_type == PREEMPT_AND_ABORT) ? - "_AND_ABORT" : ""); - } - } + if (pr_tmpl->pr_aptpl_active) + core_scsi3_update_and_write_aptpl(cmd->se_dev, true); core_scsi3_put_pr_reg(pr_reg_n); core_scsi3_pr_generation(cmd->se_dev); @@ -3119,13 +3033,8 @@ core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key, pr_reg_n); } - if (pr_tmpl->pr_aptpl_active) { - if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, - pr_reg_n->pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT" - "%s\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : ""); - } - } + if (pr_tmpl->pr_aptpl_active) + core_scsi3_update_and_write_aptpl(cmd->se_dev, true); core_scsi3_put_pr_reg(pr_reg_n); core_scsi3_pr_generation(cmd->se_dev); @@ -3552,23 +3461,7 @@ after_iport_check: } else core_scsi3_put_pr_reg(pr_reg); - /* - * Clear the APTPL metadata if APTPL has been disabled, otherwise - * write out the updated metadata to struct file for this SCSI device. - */ - if (!aptpl) { - pr_tmpl->pr_aptpl_active = 0; - core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0); - pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for" - " REGISTER_AND_MOVE\n"); - } else { - pr_tmpl->pr_aptpl_active = 1; - if (!core_scsi3_update_and_write_aptpl(cmd->se_dev, - dest_pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) { - pr_debug("SPC-3 PR: Set APTPL Bit Activated for" - " REGISTER_AND_MOVE\n"); - } - } + core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl); transport_kunmap_data_sg(cmd); diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h index 5976dc3..8952ee9 100644 --- a/include/target/target_core_base.h +++ b/include/target/target_core_base.h @@ -339,8 +339,6 @@ struct t10_pr_registration { /* Used during APTPL metadata reading */ #define PR_APTPL_MAX_TPORT_LEN 256 unsigned char pr_tport[PR_APTPL_MAX_TPORT_LEN]; - /* For writing out live meta data */ - unsigned char *pr_aptpl_buf; u16 pr_aptpl_rpti; u16 pr_reg_tpgt; /* Reservation effects all target ports */ -- 2.7.4