[SCSI] implement scsi_data_buffer
In preparation for bidi we abstract all IO members of scsi_cmnd,
that will need to duplicate, into a substructure.
- Group all IO members of scsi_cmnd into a scsi_data_buffer
structure.
- Adjust accessors to new members.
- scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
scsi_cmnd. And work on it.
- Adjust scsi_init_io() and scsi_release_buffers() for above
change.
- Fix other parts of scsi_lib/scsi.c to members migration. Use
accessors where appropriate.
- fix Documentation about scsi_cmnd in scsi_host.h
- scsi_error.c
* Changed needed members of struct scsi_eh_save.
* Careful considerations in scsi_eh_prep/restore_cmnd.
- sd.c and sr.c
* sd and sr would adjust IO size to align on device's block
size so code needs to change once we move to scsi_data_buff
implementation.
* Convert code to use scsi_for_each_sg
* Use data accessors where appropriate.
- tgt: convert libsrp to use scsi_data_buffer
- isd200: This driver still bangs on scsi_cmnd IO members,
so need changing
[jejb: rebased on top of sg_table patches fixed up conflicts
and used the synergy to eliminate use_sg and sg_count]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 547e85a..4f4edc3 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -617,29 +617,25 @@
ses->cmd_len = scmd->cmd_len;
memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
ses->data_direction = scmd->sc_data_direction;
- ses->bufflen = scmd->request_bufflen;
- ses->buffer = scmd->request_buffer;
- ses->use_sg = scmd->use_sg;
- ses->resid = scmd->resid;
+ ses->sdb = scmd->sdb;
ses->result = scmd->result;
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
+
if (sense_bytes) {
- scmd->request_bufflen = min_t(unsigned,
- SCSI_SENSE_BUFFERSIZE, sense_bytes);
+ scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,
+ sense_bytes);
sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
- scmd->request_bufflen);
- scmd->request_buffer = &ses->sense_sgl;
+ scmd->sdb.length);
+ scmd->sdb.table.sgl = &ses->sense_sgl;
scmd->sc_data_direction = DMA_FROM_DEVICE;
- scmd->use_sg = 1;
+ scmd->sdb.table.nents = 1;
memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
scmd->cmnd[0] = REQUEST_SENSE;
- scmd->cmnd[4] = scmd->request_bufflen;
+ scmd->cmnd[4] = scmd->sdb.length;
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
} else {
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
scmd->sc_data_direction = DMA_NONE;
- scmd->use_sg = 0;
if (cmnd) {
memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
memcpy(scmd->cmnd, cmnd, cmnd_size);
@@ -676,10 +672,7 @@
scmd->cmd_len = ses->cmd_len;
memcpy(scmd->cmnd, ses->cmnd, sizeof(scmd->cmnd));
scmd->sc_data_direction = ses->data_direction;
- scmd->request_bufflen = ses->bufflen;
- scmd->request_buffer = ses->buffer;
- scmd->use_sg = ses->use_sg;
- scmd->resid = ses->resid;
+ scmd->sdb = ses->sdb;
scmd->result = ses->result;
}
EXPORT_SYMBOL(scsi_eh_restore_cmnd);
@@ -1700,8 +1693,7 @@
memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
scmd->scsi_done = scsi_reset_provider_done_command;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
scmd->cmd_len = 0;