| Message ID | 1490085382-28658-3-git-send-email-lixiubo@cmss.chinamobile.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On 03/21/2017 04:36 AM, lixiubo@cmss.chinamobile.com wrote: > From: Xiubo Li <lixiubo@cmss.chinamobile.com> > > The t_data_nents and t_bidi_data_nents are the numbers of the > segments, but it couldn't be sure the block size equals to size > of the segment. > > For the worst case, all the blocks are discontiguous and there > will need the same number of iovecs, that's to say: blocks == iovs. > So here just set the number of iovs to block count needed by tcmu > cmd. > > Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com> > --- > drivers/target/target_core_user.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c > index 65d475f..ae5b74f 100644 > --- a/drivers/target/target_core_user.c > +++ b/drivers/target/target_core_user.c > @@ -408,6 +408,13 @@ static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) > return data_length; > } > > +static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) > +{ > + size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); > + > + return (data_length + DATA_BLOCK_SIZE - 1) / DATA_BLOCK_SIZE; > +} Can you just do data_length / DATA_BLOCK_SIZE, because tcmu_cmd_get_data_length will return data_length as a multiple of DATA_BLOCK_SIZE. -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 65d475f..ae5b74f 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -408,6 +408,13 @@ static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) return data_length; } +static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd) +{ + size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd); + + return (data_length + DATA_BLOCK_SIZE - 1) / DATA_BLOCK_SIZE; +} + static sense_reason_t tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd) { @@ -435,8 +442,7 @@ static inline size_t tcmu_cmd_get_data_length(struct tcmu_cmd *tcmu_cmd) * expensive to tell how many regions are freed in the bitmap */ base_command_size = max(offsetof(struct tcmu_cmd_entry, - req.iov[se_cmd->t_bidi_data_nents + - se_cmd->t_data_nents]), + req.iov[tcmu_cmd_get_block_cnt(tcmu_cmd)]), sizeof(struct tcmu_cmd_entry)); command_size = base_command_size + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE);