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BACKPORT: block: add blk_rq_set_block_pc() 

With the optimizations around not clearing the full request at alloc
time, we are leaving some of the needed init for REQ_TYPE_BLOCK_PC
up to the user allocating the request.

Add a blk_rq_set_block_pc() that sets the command type to
REQ_TYPE_BLOCK_PC, and properly initializes the members associated
with this type of request. Update callers to use this function instead
of manipulating rq->cmd_type directly.

Includes fixes from Christoph Hellwig <hch@lst.de> for my half-assed
attempt.

Change-Id: Ifc386dfb951c5d6adebf48ff38135dda28e4b1ce
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Corinna Vinschen <xda@vinschen.de>
This commit is contained in:
Jens Axboe 2014-06-06 07:57:37 -06:00 committed by LuK1337
parent ea07d83cea
commit 5836258bca
17 changed files with 41 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
block/blk-core.c
View File

@ -1194,6 +1194,8 @@ struct request *blk_make_request(struct request_queue *q, struct bio *bio,
if (unlikely(!rq))
return ERR_PTR(-ENOMEM);
blk_rq_set_block_pc(rq);
for_each_bio(bio) {
struct bio *bounce_bio = bio;
int ret;
@ -1210,6 +1212,22 @@ struct request *blk_make_request(struct request_queue *q, struct bio *bio,
}
EXPORT_SYMBOL(blk_make_request);
/**
* blk_rq_set_block_pc - initialize a requeest to type BLOCK_PC
* @rq: request to be initialized
*
*/
void blk_rq_set_block_pc(struct request *rq)
{
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->__data_len = 0;
rq->__sector = (sector_t) -1;
rq->bio = rq->biotail = NULL;
memset(rq->__cmd, 0, sizeof(rq->__cmd));
rq->cmd = rq->__cmd;
}
EXPORT_SYMBOL(blk_rq_set_block_pc);
/**
* blk_requeue_request - put a request back on queue
* @q: request queue where request should be inserted

3
block/bsg.c
View File

@ -196,7 +196,6 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq,
* fill in request structure
*/
rq->cmd_len = hdr->request_len;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = msecs_to_jiffies(hdr->timeout);
if (!rq->timeout)
@ -273,6 +272,8 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm,
rq = blk_get_request(q, rw, GFP_KERNEL);
if (!rq)
return ERR_PTR(-ENOMEM);
blk_rq_set_block_pc(rq);
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm);
if (ret)
goto out;

6
block/scsi_ioctl.c
View File

@ -233,7 +233,6 @@ static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
* fill in request structure
*/
rq->cmd_len = hdr->cmd_len;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = msecs_to_jiffies(hdr->timeout);
if (!rq->timeout)
@ -314,6 +313,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
if (!rq)
return -ENOMEM;
blk_rq_set_block_pc(rq);
if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
blk_put_request(rq);
@ -512,7 +512,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(rq);
blk_execute_rq(q, disk, rq, 0);
@ -544,7 +544,7 @@ static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
int err;
rq = blk_get_request(q, WRITE, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(rq);
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
rq->cmd[0] = cmd;
rq->cmd[4] = data;

2
drivers/block/pktcdvd.c
View File

@ -712,6 +712,7 @@ static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *
rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
WRITE : READ, __GFP_WAIT);
blk_rq_set_block_pc(rq);
if (cgc->buflen) {
if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
@ -722,7 +723,6 @@ static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *
memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
rq->timeout = 60*HZ;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
if (cgc->quiet)
rq->cmd_flags |= REQ_QUIET;

2
drivers/cdrom/cdrom.c
View File

@ -2165,6 +2165,7 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
ret = -ENOMEM;
break;
}
blk_rq_set_block_pc(rq);
ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
if (ret) {
@ -2184,7 +2185,6 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
rq->cmd[9] = 0xf8;
rq->cmd_len = 12;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->timeout = 60 * HZ;
bio = rq->bio;

2
drivers/scsi/device_handler/scsi_dh_alua.c
View File

@ -120,6 +120,7 @@ static struct request *get_alua_req(struct scsi_device *sdev,
"%s: blk_get_request failed\n", __func__);
return NULL;
}
blk_rq_set_block_pc(rq);
if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
blk_put_request(rq);
@ -128,7 +129,6 @@ static struct request *get_alua_req(struct scsi_device *sdev,
return NULL;
}
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
rq->retries = ALUA_FAILOVER_RETRIES;

2
drivers/scsi/device_handler/scsi_dh_emc.c
View File

@ -280,6 +280,7 @@ static struct request *get_req(struct scsi_device *sdev, int cmd,
return NULL;
}
blk_rq_set_block_pc(rq);
rq->cmd_len = COMMAND_SIZE(cmd);
rq->cmd[0] = cmd;
@ -304,7 +305,6 @@ static struct request *get_req(struct scsi_device *sdev, int cmd,
break;
}
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
rq->timeout = CLARIION_TIMEOUT;

4
drivers/scsi/device_handler/scsi_dh_hp_sw.c
View File

@ -120,7 +120,7 @@ retry:
if (!req)
return SCSI_DH_RES_TEMP_UNAVAIL;
req->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(req);
req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY);
@ -250,7 +250,7 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *h)
if (!req)
return SCSI_DH_RES_TEMP_UNAVAIL;
req->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(req);
req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
req->cmd_len = COMMAND_SIZE(START_STOP);

2
drivers/scsi/device_handler/scsi_dh_rdac.c
View File

@ -279,6 +279,7 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
"get_rdac_req: blk_get_request failed.\n");
return NULL;
}
blk_rq_set_block_pc(rq);
if (buflen && blk_rq_map_kern(q, rq, buffer, buflen, GFP_NOIO)) {
blk_put_request(rq);
@ -287,7 +288,6 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
return NULL;
}
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;
rq->retries = RDAC_RETRIES;

4
drivers/scsi/osd/osd_initiator.c
View File

@ -1570,6 +1570,7 @@ static struct request *_make_request(struct request_queue *q, bool has_write,
if (unlikely(!req))
return ERR_PTR(-ENOMEM);
blk_rq_set_block_pc(req);
return req;
}
}
@ -1590,7 +1591,6 @@ static int _init_blk_request(struct osd_request *or,
}
or->request = req;
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= REQ_QUIET;
req->timeout = or->timeout;
@ -1608,7 +1608,7 @@ static int _init_blk_request(struct osd_request *or,
ret = PTR_ERR(req);
goto out;
}
req->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(req);
or->in.req = or->request->next_rq = req;
}
} else if (has_in)

2
drivers/scsi/osst.c
View File

@ -365,7 +365,7 @@ static int osst_execute(struct osst_request *SRpnt, const unsigned char *cmd,
if (!req)
return DRIVER_ERROR << 24;
req->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(req);
req->cmd_flags |= REQ_QUIET;
SRpnt->bio = NULL;

3
drivers/scsi/scsi_error.c
View File

@ -1653,6 +1653,8 @@ static void scsi_eh_lock_door(struct scsi_device *sdev)
*/
req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL);
blk_rq_set_block_pc(req);
req->cmd[0] = ALLOW_MEDIUM_REMOVAL;
req->cmd[1] = 0;
req->cmd[2] = 0;
@ -1662,7 +1664,6 @@ static void scsi_eh_lock_door(struct scsi_device *sdev)
req->cmd_len = COMMAND_SIZE(req->cmd[0]);
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= REQ_QUIET;
req->timeout = 10 * HZ;
req->retries = 5;

2
drivers/scsi/scsi_lib.c
View File

@ -238,6 +238,7 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
req = blk_get_request(sdev->request_queue, write, __GFP_WAIT);
if (!req)
return ret;
blk_rq_set_block_pc(req);
if (bufflen && blk_rq_map_kern(sdev->request_queue, req,
buffer, bufflen, __GFP_WAIT))
@ -249,7 +250,6 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
req->sense_len = 0;
req->retries = retries;
req->timeout = timeout;
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->cmd_flags |= flags | REQ_QUIET | REQ_PREEMPT;
/*

3
drivers/scsi/sg.c
View File

@ -1660,10 +1660,9 @@ static int sg_start_req(Sg_request *srp, unsigned char *cmd)
if (!rq)
return -ENOMEM;
blk_rq_set_block_pc(rq);
memcpy(rq->cmd, cmd, hp->cmd_len);
rq->cmd_len = hp->cmd_len;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
srp->rq = rq;
rq->end_io_data = srp;

2
drivers/scsi/st.c
View File

@ -484,7 +484,7 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd,
if (!req)
return DRIVER_ERROR << 24;
req->cmd_type = REQ_TYPE_BLOCK_PC;
blk_rq_set_block_pc(req);
req->cmd_flags |= REQ_QUIET;
mdata->null_mapped = 1;

3
drivers/target/target_core_pscsi.c
View File

@ -1059,6 +1059,8 @@ pscsi_execute_cmd(struct se_cmd *cmd)
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto fail;
}
blk_rq_set_block_pc(req);
} else {
BUG_ON(!cmd->data_length);
@ -1075,7 +1077,6 @@ pscsi_execute_cmd(struct se_cmd *cmd)
}
}
req->cmd_type = REQ_TYPE_BLOCK_PC;
req->end_io = pscsi_req_done;
req->end_io_data = cmd;
req->cmd_len = scsi_command_size(pt->pscsi_cdb);

1
include/linux/blkdev.h
View File

@ -747,6 +747,7 @@ extern void __blk_put_request(struct request_queue *, struct request *);
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
extern struct request *blk_make_request(struct request_queue *, struct bio *,
gfp_t);
extern void blk_rq_set_block_pc(struct request *);
extern void blk_requeue_request(struct request_queue *, struct request *);
extern int blk_reinsert_request(struct request_queue *q, struct request *rq);
extern bool blk_reinsert_req_sup(struct request_queue *q);