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| author | Mike Christie <michaelc@cs.wisc.edu> | 2005-12-05 02:37:06 -0600 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-12-15 15:11:40 -0800 |
| commit | defd94b75409b983f94548ea2f52ff5787ddb848 (patch) | |
| tree | 0138b2dae748de88edaee4da23431f1a9dd347a1 /include/linux/blkdev.h | |
| parent | 8b05b773b6030de5b1bab1cbb0bf1ff8c34cdbe0 (diff) | |
| download | blackbird-op-linux-defd94b75409b983f94548ea2f52ff5787ddb848.tar.gz blackbird-op-linux-defd94b75409b983f94548ea2f52ff5787ddb848.zip | |
[SCSI] seperate max_sectors from max_hw_sectors
- 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>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 509e9a03a328..a18500d196e1 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -702,7 +702,8 @@ extern int blkdev_issue_flush(struct block_device *, sector_t *); #define MAX_PHYS_SEGMENTS 128 #define MAX_HW_SEGMENTS 128 -#define MAX_SECTORS 255 +#define SAFE_MAX_SECTORS 255 +#define BLK_DEF_MAX_SECTORS 1024 #define MAX_SEGMENT_SIZE 65536 |
