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target/user: Free data ring in unified function 

Prepare for data_bitmap in the next patch.

Reviewed-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Sheng Yang <sheng@yasker.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sheng Yang 2016-02-26 14:59:56 -08:00 committed by Nicholas Bellinger
parent f1dbd087cc
commit 0c28481ffb
1 changed files with 12 additions and 10 deletions
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22
drivers/target/target_core_user.c
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@ -303,6 +303,11 @@ static void alloc_and_scatter_data_area(struct tcmu_dev *udev,
}
}
static void free_data_area(struct tcmu_dev *udev, size_t length)
{
UPDATE_HEAD(udev->data_tail, length, udev->data_size);
}
static void gather_and_free_data_area(struct tcmu_dev *udev,
struct scatterlist *data_sg, unsigned int data_nents)
{
@ -323,7 +328,7 @@ static void gather_and_free_data_area(struct tcmu_dev *udev,
tcmu_flush_dcache_range(from, copy_bytes);
memcpy(to, from, copy_bytes);
UPDATE_HEAD(udev->data_tail, copy_bytes, udev->data_size);
free_data_area(udev, copy_bytes);
/* Uh oh, wrapped the data buffer for this sg's data */
if (sg->length != copy_bytes) {
@ -336,8 +341,7 @@ static void gather_and_free_data_area(struct tcmu_dev *udev,
tcmu_flush_dcache_range(from, copy_bytes);
memcpy(to_skip, from, copy_bytes);
UPDATE_HEAD(udev->data_tail,
copy_bytes, udev->data_size);
free_data_area(udev, copy_bytes);
}
kunmap_atomic(to - sg->offset);
}
@ -543,24 +547,22 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
/* cmd has been completed already from timeout, just reclaim data
ring space */
UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size);
free_data_area(udev, cmd->data_length);
return;
}
if (entry->hdr.uflags & TCMU_UFLAG_UNKNOWN_OP) {
UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size);
free_data_area(udev, cmd->data_length);
pr_warn("TCMU: Userspace set UNKNOWN_OP flag on se_cmd %p\n",
cmd->se_cmd);
entry->rsp.scsi_status = SAM_STAT_CHECK_CONDITION;
} else if (entry->rsp.scsi_status == SAM_STAT_CHECK_CONDITION) {
memcpy(se_cmd->sense_buffer, entry->rsp.sense_buffer,
se_cmd->scsi_sense_length);
UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size);
free_data_area(udev, cmd->data_length);
} else if (se_cmd->se_cmd_flags & SCF_BIDI) {
/* Discard data_out buffer */
UPDATE_HEAD(udev->data_tail,
(size_t)se_cmd->t_data_sg->length, udev->data_size);
free_data_area(udev, (size_t)se_cmd->t_data_sg->length);
/* Get Data-In buffer */
gather_and_free_data_area(udev,
@ -569,7 +571,7 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
gather_and_free_data_area(udev,
se_cmd->t_data_sg, se_cmd->t_data_nents);
} else if (se_cmd->data_direction == DMA_TO_DEVICE) {
UPDATE_HEAD(udev->data_tail, cmd->data_length, udev->data_size);
free_data_area(udev, cmd->data_length);
} else if (se_cmd->data_direction != DMA_NONE) {
pr_warn("TCMU: data direction was %d!\n",
se_cmd->data_direction);