linux/include/target
Nicholas Bellinger d0c8b259f8 target/iblock: Use backend REQ_FLUSH hint for WriteCacheEnabled status
This patch allows IBLOCK to check block hints in request_queue->flush_flags
when reporting current backend device WriteCacheEnabled status to a remote
SCSI initiator port.

This is done via a se_subsystem_api->get_write_cache() call instead of a
backend se_device creation time flag, as we expect REQ_FLUSH bits to possibly
change from an underlying blk_queue_flush() by the SCSI disk driver, or
internal raw struct block_device driver usage.

Also go ahead and update iblock_execute_rw() bio I/O path code to use
REQ_FLUSH + REQ_FUA hints when determining WRITE_FUA usage, and make SPC
emulation code use a spc_check_dev_wce() helper to handle both types of
cases for virtual backend subsystem drivers.

(asias: Drop unnecessary comparsion operators)

Reported-by: majianpeng <majianpeng@gmail.com>
Cc: majianpeng <majianpeng@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2013-02-13 11:27:51 -08:00
..
configfs_macros.h doc: fix broken references 2011-09-27 18:08:04 +02:00
target_core_backend.h target/iblock: Use backend REQ_FLUSH hint for WriteCacheEnabled status 2013-02-13 11:27:51 -08:00
target_core_base.h target: change sprintf to snprintf in transport_dump_vpd_ident 2013-02-13 11:27:31 -08:00
target_core_configfs.h [SCSI] target: add initial statistics 2011-03-23 11:36:50 -05:00
target_core_fabric_configfs.h
target_core_fabric.h target/iscsi_target: Add NodeACL tags for initiator group support 2012-12-13 14:18:09 -08:00