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[PATCH] Split struct request ->flags into two parts

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Right now ->flags is a bit of a mess: some are request types, and
others are just modifiers. Clean this up by splitting it into
->cmd_type and ->cmd_flags. This allows introduction of generic
Linux block message types, useful for sending generic Linux commands
to block devices.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe
2006-08-10 08:44:47 +02:00
committed by Jens Axboe
parent 77ed74da26
commit 4aff5e2333
39 changed files with 295 additions and 301 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/scsi/scsi_lib.c
View File

@@ -82,7 +82,7 @@ static void scsi_unprep_request(struct request *req)
{
struct scsi_cmnd *cmd = req->special;
req->flags &= ~REQ_DONTPREP;
req->cmd_flags &= ~REQ_DONTPREP;
req->special = NULL;
scsi_put_command(cmd);
@@ -196,7 +196,8 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
req->sense_len = 0;
req->retries = retries;
req->timeout = timeout;
req->flags |= flags | REQ_BLOCK_PC | REQ_SPECIAL | REQ_QUIET;
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= flags | REQ_QUIET | REQ_PREEMPT;
/*
* head injection *required* here otherwise quiesce won't work
@@ -397,7 +398,8 @@ int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
req = blk_get_request(sdev->request_queue, write, gfp);
if (!req)
goto free_sense;
req->flags |= REQ_BLOCK_PC | REQ_QUIET;
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= REQ_QUIET;
if (use_sg)
err = scsi_req_map_sg(req, buffer, use_sg, bufflen, gfp);
@@ -933,7 +935,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
break;
}
}
if (!(req->flags & REQ_QUIET)) {
if (!(req->cmd_flags & REQ_QUIET)) {
scmd_printk(KERN_INFO, cmd,
"Device not ready: ");
scsi_print_sense_hdr("", &sshdr);
@@ -941,7 +943,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
scsi_end_request(cmd, 0, this_count, 1);
return;
case VOLUME_OVERFLOW:
if (!(req->flags & REQ_QUIET)) {
if (!(req->cmd_flags & REQ_QUIET)) {
scmd_printk(KERN_INFO, cmd,
"Volume overflow, CDB: ");
__scsi_print_command(cmd->cmnd);
@@ -963,7 +965,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
return;
}
if (result) {
if (!(req->flags & REQ_QUIET)) {
if (!(req->cmd_flags & REQ_QUIET)) {
scmd_printk(KERN_INFO, cmd,
"SCSI error: return code = 0x%08x\n",
result);
@@ -995,7 +997,7 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
/*
* if this is a rq->data based REQ_BLOCK_PC, setup for a non-sg xfer
*/
if ((req->flags & REQ_BLOCK_PC) && !req->bio) {
if (blk_pc_request(req) && !req->bio) {
cmd->request_bufflen = req->data_len;
cmd->request_buffer = req->data;
req->buffer = req->data;
@@ -1139,13 +1141,12 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
* these two cases differently. We differentiate by looking
* at request->cmd, as this tells us the real story.
*/
if (req->flags & REQ_SPECIAL && req->special) {
if (blk_special_request(req) && req->special)
cmd = req->special;
} else if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) {
if(unlikely(specials_only) && !(req->flags & REQ_SPECIAL)) {
if(specials_only == SDEV_QUIESCE ||
specials_only == SDEV_BLOCK)
else if (blk_pc_request(req) || blk_fs_request(req)) {
if (unlikely(specials_only) && !(req->cmd_flags & REQ_PREEMPT)){
if (specials_only == SDEV_QUIESCE ||
specials_only == SDEV_BLOCK)
goto defer;
sdev_printk(KERN_ERR, sdev,
@@ -1153,7 +1154,6 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
goto kill;
}
/*
* Now try and find a command block that we can use.
*/
@@ -1184,7 +1184,7 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
* lock. We hope REQ_STARTED prevents anything untoward from
* happening now.
*/
if (req->flags & (REQ_CMD | REQ_BLOCK_PC)) {
if (blk_fs_request(req) || blk_pc_request(req)) {
int ret;
/*
@@ -1216,7 +1216,7 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
/*
* Initialize the actual SCSI command for this request.
*/
if (req->flags & REQ_BLOCK_PC) {
if (blk_pc_request(req)) {
scsi_setup_blk_pc_cmnd(cmd);
} else if (req->rq_disk) {
struct scsi_driver *drv;
@@ -1233,7 +1233,7 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
/*
* The request is now prepped, no need to come back here
*/
req->flags |= REQ_DONTPREP;
req->cmd_flags |= REQ_DONTPREP;
return BLKPREP_OK;
defer:
@@ -1454,8 +1454,9 @@ static void scsi_request_fn(struct request_queue *q)
if (unlikely(cmd == NULL)) {
printk(KERN_CRIT "impossible request in %s.\n"
"please mail a stack trace to "
"linux-scsi@vger.kernel.org",
"linux-scsi@vger.kernel.org\n",
__FUNCTION__);
blk_dump_rq_flags(req, "foo");
BUG();
}
spin_lock(shost->host_lock);