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tcm_fc: Convert ft_send_work to use target_submit_cmd

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This patch converts the main ft_send_work() I/O path to use
target_submit_cmd() with a single se_cmd->cmd_kref reference
that is released via the existing ft_check_stop_free() response
path callback.

It also makes ft_send_tm() use transport_init_se_cmd() and
target_get_sess_cmd() to also use single se_cmd->cmd_kref
reference.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Kiran Patil <kiran.patil@intel.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2011-11-22 21:41:54 -08:00
parent a636078552
commit 4355a9110e
1 changed files with 13 additions and 38 deletions
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51
drivers/target/tcm_fc/tfc_cmd.c
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@ -363,6 +363,11 @@ static void ft_send_tm(struct ft_cmd *cmd)
struct ft_sess *sess;
u8 tm_func;
transport_init_se_cmd(&cmd->se_cmd, &ft_configfs->tf_ops,
cmd->sess->se_sess, 0, DMA_NONE, 0,
&cmd->ft_sense_buffer[0]);
target_get_sess_cmd(cmd->sess->se_sess, &cmd->se_cmd, false);
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
switch (fcp->fc_tm_flags) {
@ -416,7 +421,6 @@ static void ft_send_tm(struct ft_cmd *cmd)
sess = cmd->sess;
transport_send_check_condition_and_sense(&cmd->se_cmd,
cmd->se_cmd.scsi_sense_reason, 0);
transport_generic_free_cmd(&cmd->se_cmd, 0);
ft_sess_put(sess);
return;
}
@ -532,7 +536,6 @@ static void ft_send_work(struct work_struct *work)
{
struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
struct se_cmd *se_cmd;
struct fcp_cmnd *fcp;
int data_dir = 0;
u32 data_len;
@ -587,15 +590,6 @@ static void ft_send_work(struct work_struct *work)
data_len = ntohl(fcp->fc_dl);
cmd->cdb = fcp->fc_cdb;
}
se_cmd = &cmd->se_cmd;
/*
* Initialize struct se_cmd descriptor from target_core_mod
* infrastructure
*/
transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
data_len, data_dir, task_attr,
&cmd->ft_sense_buffer[0]);
/*
* Check for FCP task management flags
*/
@ -603,39 +597,20 @@ static void ft_send_work(struct work_struct *work)
ft_send_tm(cmd);
return;
}
fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
/*
* Use a single se_cmd->cmd_kref as we expect to release se_cmd
* directly from ft_check_stop_free callback in response path.
*/
ret = target_submit_cmd(&cmd->se_cmd, cmd->sess->se_sess, cmd->cdb,
&cmd->ft_sense_buffer[0], cmd->lun, data_len,
task_attr, data_dir, 0);
pr_debug("r_ctl %x alloc target_submit_cmd %d\n", fh->fh_r_ctl, ret);
if (ret < 0) {
ft_dump_cmd(cmd, __func__);
transport_send_check_condition_and_sense(&cmd->se_cmd,
cmd->se_cmd.scsi_sense_reason, 0);
return;
}
ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
ft_dump_cmd(cmd, __func__);
if (ret == -ENOMEM) {
transport_send_check_condition_and_sense(se_cmd,
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
}
if (ret == -EINVAL) {
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
ft_queue_status(se_cmd);
else
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
transport_generic_free_cmd(se_cmd, 0);
return;
}
transport_handle_cdb_direct(se_cmd);
return;
err: