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Date: Sat, 2 Oct 2010 17:53:49 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Boaz Harrosh <bharrosh@...asas.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Douglas Gilbert <dgilbert@...erlog.com>
Cc: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Hannes Reinecke <hare@...e.de>,
James Bottomley <James.Bottomley@...e.de>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 2/2] tcm/iblock,fileio: Add WRITE_SAME_16 w/ UNMAP=1 bit support
From: Nicholas Bellinger <nab@...ux-iscsi.org>
This patch updates TCM/IBLOCK and TCM/FILEIO code to support WRITE_SAME_16
w/ UNMAP=1 bit emulation following generic Block Discards support using
blk_issue_discard(). This includes setting DEV_ATTRIB(dev)->emulate_tpws=1
in [iblock,fd]_create_virtdevice() callers with blk_queue_discard()==1, and
the individual [iblock,fd]_emulate_write_same_unmap() to locate struct block_device,
and call the generic transport_generic_write_same() symbol from TCM Core.
So far this patch has been tested using 'sg_write_same -S' from TCM_Loop ->
IBLOCK+FILEIO -> scsi_debug LUNs.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
---
drivers/target/target_core_file.c | 47 ++++++++++++++++++++++++++++++++++-
drivers/target/target_core_iblock.c | 21 +++++++++++++++-
2 files changed, 66 insertions(+), 2 deletions(-)
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 15f7847..1215f3c 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -256,8 +256,9 @@ static struct se_device *fd_create_virtdevice(
q->limits.discard_alignment;
DEV_ATTRIB(dev)->emulate_tpu = 1;
+ DEV_ATTRIB(dev)->emulate_tpws = 1;
printk(KERN_INFO "FILEIO: Enabling BLOCK Discard"
- " and TPU=1 emulation\n");
+ " for TPU=1 and TPWS=1 emulation\n");
}
}
@@ -525,6 +526,48 @@ static int fd_emulate_scsi_cdb(struct se_task *task)
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
}
+static int fd_emulate_write_same_unmap(struct se_task *task)
+{
+ struct se_cmd *cmd = TASK_CMD(task);
+ struct fd_dev *fd_dev = task->se_dev->dev_ptr;
+ struct file *f = fd_dev->fd_file;
+ struct inode *i;
+ struct block_device *bd;
+ int ret;
+
+ i = igrab(f->f_mapping->host);
+ if (!(i)) {
+ printk(KERN_ERR "FILEIO: Unable to locate inode for"
+ " backend for WRITE_SAME\n");
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ /*
+ * Currently for struct file w/o a struct block_device
+ * backend we return a success..
+ */
+ if (!(S_ISBLK(i->i_mode))) {
+ printk(KERN_WARNING "Ignoring WRITE_SAME for non BD"
+ " backend for struct file\n");
+ iput(i);
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ bd = I_BDEV(f->f_mapping->host);
+ if (!(bd)) {
+ printk(KERN_ERR "FILEIO: Unable to locate struct"
+ " block_device for WRITE_SAME\n");
+ iput(i);
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ ret = transport_generic_write_same(cmd, bd);
+ iput(i);
+ if (ret < 0)
+ return ret;
+
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
static inline int fd_iovec_alloc(struct fd_request *req)
{
req->fd_iovs = kzalloc(sizeof(struct iovec) * req->fd_sg_count,
@@ -814,6 +857,8 @@ static int fd_do_task(struct se_task *task)
if (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))
return fd_emulate_scsi_cdb(task);
+ else if (T_TASK(cmd)->t_tasks_unmap)
+ return fd_emulate_write_same_unmap(task);
req->fd_lba = task->task_lba;
req->fd_size = task->task_size;
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index dc96fcf..44d54a6 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -241,8 +241,9 @@ static struct se_device *iblock_create_virtdevice(
q->limits.discard_alignment;
DEV_ATTRIB(dev)->emulate_tpu = 1;
+ DEV_ATTRIB(dev)->emulate_tpws = 1;
printk(KERN_INFO "IBLOCK: Enabling BLOCK Discard support"
- " and TPU=1 emulation\n");
+ " for TPU=1 and TPWS=1 emulation\n");
}
return dev;
@@ -547,6 +548,22 @@ static int iblock_emulate_scsi_cdb(struct se_task *task)
return PYX_TRANSPORT_SENT_TO_TRANSPORT;
}
+static int iblock_emulate_write_same_unmap(struct se_task *task)
+{
+ struct iblock_dev *ibd = task->se_dev->dev_ptr;
+ struct block_device *bd = ibd->ibd_bd;
+ struct se_cmd *cmd = TASK_CMD(task);
+ int ret;
+
+ ret = transport_generic_write_same(cmd, bd);
+ if (ret < 0)
+ return ret;
+
+ task->task_scsi_status = GOOD;
+ transport_complete_task(task, 1);
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
static int __iblock_do_sync_cache(struct se_device *dev)
{
struct iblock_dev *ib_dev = (struct iblock_dev *)dev->dev_ptr;
@@ -638,6 +655,8 @@ static int iblock_do_task(struct se_task *task)
if (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))
return iblock_emulate_scsi_cdb(task);
+ else if (T_TASK(task->task_se_cmd)->t_tasks_unmap)
+ return iblock_emulate_write_same_unmap(task);
while (bio) {
nbio = bio->bi_next;
--
1.5.6.5
--
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