From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> Greetings hch, tejun and Co, This patch series adds WriteCache + FUA Write emulation support into TCM v4 Core and ConfigFS generic code at lio-core-2.6.git/lio-4.0. The series changes the TCM subsystem plugin API at include/target/target_core_transport.h:struct se_subsystem_api that allows SYNCHRONIZE_CACHE emulation to be shared amoungst multiple TCM subsystem plugins (eg: FILEIO, IBLOCK, RAMDISK). This series includes initial support for WCE=1 and DPOFUA=1 using the TCM/FILEIO subsystem plugin. This first patch adds the device attribute infrastructure emulation into target_core_transport.c and target_core_device.c, and adds four new configfs attributes that appear in /sys/kernel/config/target/core/fileio_$ID/$DEV/attrib/ The second patch adds SYNCHRONIZE_CACHE and SYNCHRONIZE_CACHE_16 emulation code capable of LBA + Range (Number of Blocks) context flushing in target_core_transport.c: transport_generic_synchronize_cache(). This function uses the new struct se_subsystem_api ->do_sync_cache() and ->do_sync_cache_range() function pointers to make the calls out into TCM subsystem plugin dependent code. The third patch updates the MODE_SENSE* emulation for TYPE_DISK to change the Caching Control Page to set WCE=1, and device type specific area for DPOFUA=1 for the FUA Write emulation bit. And the final patch modifies TCM/FILEIO to use the new struct se_subsystem_api callers using fs/sync.c:vfs_fsync() and vfs_fsync_range() from below transport_generic_synchronize_cache() Here are the remaining item(s) on the TODO: *) Support FUA READs..? *) Support for DPO aside from FUA WRITE/READ (is this possible..?) *) Using kernel level fcntl() to enable/disable O_SYNC using emulate_write_cache configfs attribute (see patch #4) *) Add sense data for failed FUA WRITE task case in TCM/FILEIO drivers/target/target_core_file.c:fd_do_task(). Comments are welcome, Thanks! Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> Nicholas Bellinger (4): tcm: Add WriteCache and FUADPO infrastructure and attributes tcm: Add SYNCHRONIZE_CACHE* CDB infrastructure and emulation tcm: Add WriteCache and DPOFUA emulation bits to MODE_SENSE tcm/fileio: Add WriteCache and Forced Unit Access WRITE emulation drivers/target/target_core_configfs.c | 16 +++ drivers/target/target_core_device.c | 84 +++++++++++++++++ drivers/target/target_core_file.c | 159 +++++++++++++++++++++++++++++++- drivers/target/target_core_transport.c | 156 ++++++++++++++++++++++++++++--- include/target/target_core_base.h | 7 ++ include/target/target_core_device.h | 4 + include/target/target_core_transport.h | 39 ++++++++ 7 files changed, 450 insertions(+), 15 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
