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[SCSI] seperate max_sectors from max_hw_sectors

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- export __blk_put_request and blk_execute_rq_nowait
needed for async REQ_BLOCK_PC requests
- seperate max_hw_sectors and max_sectors for block/scsi_ioctl.c and
SG_IO bio.c helpers per Jens's last comments. Since block/scsi_ioctl.c SG_IO was
already testing against max_sectors and SCSI-ml was setting max_sectors and
max_hw_sectors to the same value this does not change any scsi SG_IO behavior. It only
prepares ll_rw_blk.c, scsi_ioctl.c and bio.c for when SCSI-ml begins to set
a valid max_hw_sectors for all LLDs. Today if a LLD does not set it
SCSI-ml sets it to a safe default and some LLDs set it to a artificial low
value to overcome memory and feedback issues.

Note: Since we now cap max_sectors to BLK_DEF_MAX_SECTORS, which is 1024,
drivers that used to call blk_queue_max_sectors with a large value of
max_sectors will now see the fs requests capped to BLK_DEF_MAX_SECTORS.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie
2005-12-05 02:37:06 -06:00
committed by James Bottomley
parent 8b05b773b6
commit defd94b754
6 changed files with 42 additions and 21 deletions
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20
fs/bio.c
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@@ -313,7 +313,8 @@ int bio_get_nr_vecs(struct block_device *bdev)
}
static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page
*page, unsigned int len, unsigned int offset)
*page, unsigned int len, unsigned int offset,
unsigned short max_sectors)
{
int retried_segments = 0;
struct bio_vec *bvec;
@@ -327,7 +328,7 @@ static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page
if (bio->bi_vcnt >= bio->bi_max_vecs)
return 0;
if (((bio->bi_size + len) >> 9) > q->max_sectors)
if (((bio->bi_size + len) >> 9) > max_sectors)
return 0;
/*
@@ -401,7 +402,7 @@ static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page
int bio_add_pc_page(request_queue_t *q, struct bio *bio, struct page *page,
unsigned int len, unsigned int offset)
{
return __bio_add_page(q, bio, page, len, offset);
return __bio_add_page(q, bio, page, len, offset, q->max_hw_sectors);
}
/**
@@ -420,8 +421,8 @@ int bio_add_pc_page(request_queue_t *q, struct bio *bio, struct page *page,
int bio_add_page(struct bio *bio, struct page *page, unsigned int len,
unsigned int offset)
{
return __bio_add_page(bdev_get_queue(bio->bi_bdev), bio, page,
len, offset);
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
return __bio_add_page(q, bio, page, len, offset, q->max_sectors);
}
struct bio_map_data {
@@ -533,7 +534,7 @@ struct bio *bio_copy_user(request_queue_t *q, unsigned long uaddr,
break;
}
if (__bio_add_page(q, bio, page, bytes, 0) < bytes) {
if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes) {
ret = -EINVAL;
break;
}
@@ -647,7 +648,8 @@ static struct bio *__bio_map_user_iov(request_queue_t *q,
/*
* sorry...
*/
if (__bio_add_page(q, bio, pages[j], bytes, offset) < bytes)
if (bio_add_pc_page(q, bio, pages[j], bytes, offset) <
bytes)
break;
len -= bytes;
@@ -820,8 +822,8 @@ static struct bio *__bio_map_kern(request_queue_t *q, void *data,
if (bytes > len)
bytes = len;
if (__bio_add_page(q, bio, virt_to_page(data), bytes,
offset) < bytes)
if (bio_add_pc_page(q, bio, virt_to_page(data), bytes,
offset) < bytes)
break;
data += bytes;