a17f091d1a
This patch adds the initial pieces of generic active I/O shutdown logic. This is intended to be a 'opt-in' feature for fabric modules that includes the following functions to provide a mechinism for fabric modules to track se_cmd via se_session->sess_cmd_list: *) target_get_sess_cmd() - Add se_cmd to sess->sess_cmd_list, called from fabric module incoming I/O path. *) target_put_sess_cmd() - Check for completion or drop se_cmd from ->sess_cmd_list *) target_splice_sess_cmd_list() - Splice active I/O list from ->sess_cmd_list to ->sess_wait_list, can called with HW fabric lock held. *) target_wait_for_sess_cmds() - Walk ->sess_wait_list waiting on individual ->cmd_wait_comp. Optional transport_wait_for_tasks() call. target_splice_sess_cmd_list() is allowed to be called under HW fabric lock, and performs the splice into se_sess->sess_wait_list and set se_cmd->cmd_wait_set. Then target_wait_for_sess_cmds() walks the list waiting for individual target_put_sess_cmd() fabric callbacks to complete. It also adds TFO->check_release_cmd() to split the completion and memory release calls, where a fabric module uses target_put_sess_cmd() to check for I/O completion during session shutdown. This is currently pushed out into fabric modules as current fabric code may sleep here waiting for TFO->check_stop_free() to complete in main response path, and because target_wait_for_sess_cmds() calling TFO->release_cmd() to free fabric descriptor memory directly. Cc: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org> |
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.. | ||
iscsi | ||
loopback | ||
tcm_fc | ||
Kconfig | ||
Makefile | ||
target_core_alua.c | ||
target_core_alua.h | ||
target_core_cdb.c | ||
target_core_configfs.c | ||
target_core_device.c | ||
target_core_fabric_configfs.c | ||
target_core_fabric_lib.c | ||
target_core_file.c | ||
target_core_file.h | ||
target_core_hba.c | ||
target_core_hba.h | ||
target_core_iblock.c | ||
target_core_iblock.h | ||
target_core_pr.c | ||
target_core_pr.h | ||
target_core_pscsi.c | ||
target_core_pscsi.h | ||
target_core_rd.c | ||
target_core_rd.h | ||
target_core_stat.c | ||
target_core_stat.h | ||
target_core_tmr.c | ||
target_core_tpg.c | ||
target_core_transport.c | ||
target_core_ua.c | ||
target_core_ua.h |