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| author | Roland Dreier <roland@purestorage.com> | 2012-02-13 16:18:17 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-02-25 14:37:49 -0800 |
| commit | 015487b89f27d91d95a056cdc3c85e6c729bff12 (patch) | |
| tree | 0cecb2acc903154e25abb23e8f345f301fcd1ef5 /drivers/target/target_core_configfs.c | |
| parent | effc6cc8828257c32c37635e737f14fd6e19ecd7 (diff) | |
| download | linux-0-day-015487b89f27d91d95a056cdc3c85e6c729bff12.tar.gz linux-0-day-015487b89f27d91d95a056cdc3c85e6c729bff12.tar.xz | |
target: Untangle front-end and back-end meanings of max_sectors attribute
se_dev_attrib.max_sectors currently has two independent meanings:
- It is reported in the block limits VPD page as the maximum transfer
length, ie the largest IO that the front-end (fabric) can handle.
Also the target core doesn't enforce this maximum transfer length.
- It is used to hold the size of the largest IO that the back-end can
handle, so we know when to split SCSI commands into multiple tasks.
Fix this by adding a new se_dev_attrib.fabric_max_sectors to hold the
maximum transfer length, and checking incoming IOs against that limit.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_configfs.c')
| -rw-r--r-- | drivers/target/target_core_configfs.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c index 0700d3b3d1c0b..ac0ee5021c294 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -702,6 +702,9 @@ SE_DEV_ATTR_RO(hw_max_sectors); DEF_DEV_ATTRIB(max_sectors); SE_DEV_ATTR(max_sectors, S_IRUGO | S_IWUSR); +DEF_DEV_ATTRIB(fabric_max_sectors); +SE_DEV_ATTR(fabric_max_sectors, S_IRUGO | S_IWUSR); + DEF_DEV_ATTRIB(optimal_sectors); SE_DEV_ATTR(optimal_sectors, S_IRUGO | S_IWUSR); @@ -741,6 +744,7 @@ static struct configfs_attribute *target_core_dev_attrib_attrs[] = { &target_core_dev_attrib_block_size.attr, &target_core_dev_attrib_hw_max_sectors.attr, &target_core_dev_attrib_max_sectors.attr, + &target_core_dev_attrib_fabric_max_sectors.attr, &target_core_dev_attrib_optimal_sectors.attr, &target_core_dev_attrib_hw_queue_depth.attr, &target_core_dev_attrib_queue_depth.attr, |