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Date: Wed, 13 Oct 2010 01:48:29 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Christoph Hellwig <hch@....de>
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Hannes Reinecke <hare@...e.de>,
James Bottomley <James.Bottomley@...e.de>,
Boaz Harrosh <bharrosh@...asas.com>,
Jens Axboe <axboe@...nel.dk>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Douglas Gilbert <dgilbert@...erlog.com>,
Richard Sharpe <realrichardsharpe@...il.com>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 5/5] tcm: Unify SYNCHRONIZE_CACHE_* subsystem plugin handling
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch adds the following struct se_subsystem_api function pointer
op for SYNCHRONIZE_CACHE and SYNCHRONIZE_CACHE_16 handling an explict
WriteCacheEnabled (WCE=1) flush:
/*
* Used by virtual subsystem plugins IBLOCK and FILEIO to emulate
* SYNCHRONIZE_CACHE_* <-> Linux/Block blkdev_issue_flush()
*/
void (*do_sync_cache)(struct se_task *);
and updates IBLOCK and FILEIO to execute -> Linux/Block blkdev_issue_flush()
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
Reported-by: Christoph Hellwig <hch@....de>
---
drivers/target/target_core_file.c | 6 +-----
drivers/target/target_core_iblock.c | 6 +-----
drivers/target/target_core_transport.c | 5 ++---
include/target/target_core_transport.h | 18 +++++-------------
4 files changed, 9 insertions(+), 26 deletions(-)
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index adac070..3a68932 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -1173,6 +1173,7 @@ static struct se_subsystem_api fileio_template = {
.allocate_request = fd_allocate_request,
.do_task = fd_do_task,
.do_discard = fd_do_discard,
+ .do_sync_cache = fd_emulate_sync_cache,
.free_task = fd_free_task,
.check_configfs_dev_params = fd_check_configfs_dev_params,
.set_configfs_dev_params = fd_set_configfs_dev_params,
@@ -1197,16 +1198,11 @@ static struct se_subsystem_api fileio_template = {
.write_pending = NULL,
};
-static struct se_subsystem_api_cdb fileio_cdb_template = {
- .emulate_sync_cache = fd_emulate_sync_cache,
-};
-
int __init fileio_module_init(void)
{
int ret;
INIT_LIST_HEAD(&fileio_template.sub_api_list);
- fileio_template.sub_cdb = &fileio_cdb_template;
ret = transport_subsystem_register(&fileio_template, THIS_MODULE);
if (ret < 0)
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index e1d945f..5e810ea 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -1088,6 +1088,7 @@ static struct se_subsystem_api iblock_template = {
.allocate_request = iblock_allocate_request,
.do_task = iblock_do_task,
.do_discard = iblock_do_discard,
+ .do_sync_cache = iblock_emulate_sync_cache,
.free_task = iblock_free_task,
.check_configfs_dev_params = iblock_check_configfs_dev_params,
.set_configfs_dev_params = iblock_set_configfs_dev_params,
@@ -1113,16 +1114,11 @@ static struct se_subsystem_api iblock_template = {
.write_pending = NULL,
};
-static struct se_subsystem_api_cdb iblock_cdb_template = {
- .emulate_sync_cache = iblock_emulate_sync_cache,
-};
-
int __init iblock_module_init(void)
{
int ret;
INIT_LIST_HEAD(&iblock_template.sub_api_list);
- iblock_template.sub_cdb = &iblock_cdb_template;
ret = transport_subsystem_register(&iblock_template, THIS_MODULE);
if (ret < 0)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 469f46f..4a30fb9 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -5547,7 +5547,6 @@ int transport_emulate_control_cdb(struct se_task *task)
{
struct se_cmd *cmd = TASK_CMD(task);
struct se_device *dev = SE_DEV(cmd);
- struct se_subsystem_api_cdb *api_cdb = TRANSPORT(dev)->sub_cdb;
sector_t blocks_long;
unsigned int blocks;
int ret;
@@ -5646,12 +5645,12 @@ int transport_emulate_control_cdb(struct se_task *task)
break;
case SYNCHRONIZE_CACHE:
case 0x91: /* SYNCHRONIZE_CACHE_16: */
- if (!(api_cdb->emulate_sync_cache)) {
+ if (!(TRANSPORT(dev)->do_sync_cache)) {
printk(KERN_ERR "SYNCHRONIZE_CACHE emulation not supported"
" for: %s\n", TRANSPORT(dev)->name);
return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
}
- api_cdb->emulate_sync_cache(task);
+ TRANSPORT(dev)->do_sync_cache(task);
break;
case ALLOW_MEDIUM_REMOVAL:
case ERASE:
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index dd0448b..b8182e3 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -319,14 +319,6 @@ struct se_mem {
} ____cacheline_aligned;
/*
- * Used as a minimal template for per CDB specific emulation into TCM
- * subsystem plugins.for those CDBs that cannot be emulated generically.
- */
-struct se_subsystem_api_cdb {
- void (*emulate_sync_cache)(struct se_task *);
-};
-
-/*
* Each type of disk transport supported MUST have a template defined
* within its .h file.
*/
@@ -352,11 +344,6 @@ struct se_subsystem_api {
*/
struct module *sub_owner;
/*
- * Set of function pointers use for per CDB context emulation
- * by virtual IBLOCK, FILEIO, and RAMDISK subsystem plugins.
- */
- struct se_subsystem_api_cdb *sub_cdb;
- /*
* Counter for struct se_hba reference
*/
atomic_t sub_api_hba_cnt;
@@ -486,6 +473,11 @@ struct se_subsystem_api {
*/
int (*do_discard)(struct se_task *, enum blk_discard_type);
/*
+ * Used by virtual subsystem plugins IBLOCK and FILEIO to emulate
+ * SYNCHRONIZE_CACHE_* <-> Linux/Block blkdev_issue_flush()
+ */
+ void (*do_sync_cache)(struct se_task *);
+ /*
* free_task():
*/
void (*free_task)(struct se_task *);
--
1.5.6.5
--
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