From: Nicholas Bellinger <nab at linux-iscsi.org> This patch adds struct device_type_template sg_template to usr/bs_sg.c used for STGT LUN passthrough with the new bs_sg_lu_init() and bs_sg_rw() functions following usr/sbc.c code for TYPE_DISK, but should work for any device type. It also adds struct bs_sg_init() that is called from existing usr/target.c:tgt_device_create() code via struct backingstore_template->bs_init() in order to setup the passthrough specific queue and completion handlers for struct scsi_lu->cmd_perform() and ->cmd_done(). Signed-off-by: Nicholas A. Bellinger <nab at linux-iscsi.org> --- usr/bs_sg.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 69 insertions(+), 0 deletions(-) diff --git a/usr/bs_sg.c b/usr/bs_sg.c index 8baa480..23676ef 100644 --- a/usr/bs_sg.c +++ b/usr/bs_sg.c @@ -38,9 +38,12 @@ #include "util.h" #include "tgtd.h" #include "scsi.h" +#include "spc.h" +#include "tgtadm_error.h" #define BS_SG_RESVD_SZ (512 * 1024) #define BS_SG_TIMEOUT 2000 +#define BS_SG_SHIFT 9 static int graceful_read(int fd, void *p_read, int to_read) { @@ -82,6 +85,32 @@ static int graceful_write(int fd, void *p_write, int to_write) return 0; } +static int bs_sg_rw(int host_no, struct scsi_cmd *cmd) +{ + int ret; + unsigned char key = ILLEGAL_REQUEST; + uint16_t asc = ASC_LUN_NOT_SUPPORTED; + + cmd->scsi_cmd_done = target_cmd_io_done; + + cmd->offset = (scsi_rw_offset(cmd->scb) << BS_SG_SHIFT); + ret = cmd->dev->bst->bs_cmd_submit(cmd); + if (ret) { + key = HARDWARE_ERROR; + asc = ASC_INTERNAL_TGT_FAILURE; + } else { + set_cmd_mmapio(cmd); + return SAM_STAT_GOOD; + } + + cmd->offset = 0; + scsi_set_in_resid_by_actual(cmd, 0); + scsi_set_out_resid_by_actual(cmd, 0); + + sense_data_build(cmd, key, asc); + return SAM_STAT_CHECK_CONDITION; +} + static void set_cmd_failed(struct scsi_cmd *cmd) { int result = SAM_STAT_CHECK_CONDITION; @@ -192,6 +221,25 @@ static int init_sg_device(int fd) return 0; } +static int bs_sg_init(struct scsi_lu *lu) +{ + /* + * Setup struct scsi_lu->cmd_perform() passthrough pointer + * (if available) for the underlying device type. + */ + lu->cmd_perform = &target_cmd_perform_passthrough; + if (!(lu->cmd_perform)) { + eprintf("Unable to locate lu->cmd_perform() for bs_sg\n"); + return -1; + } + /* + * Setup struct scsi_lu->cmd_done() passthrough pointer using + * usr/target.c:__cmd_done_passthrough(). + */ + lu->cmd_done = &__cmd_done_passthrough; + return 0; +} + static int bs_sg_open(struct scsi_lu *lu, char *path, int *fd, uint64_t *size) { int sg_fd, err; @@ -235,16 +283,37 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd) return 0; } +static int bs_sg_lu_init(struct scsi_lu *lu) +{ + if (spc_lu_init(lu)) + return TGTADM_NOMEM; + + return 0; +} + static struct backingstore_template sg_bst = { .bs_name = "sg", .bs_datasize = 0, + .bs_passthrough = 1, + .bs_init = bs_sg_init, .bs_open = bs_sg_open, .bs_close = bs_sg_close, .bs_cmd_submit = bs_sg_cmd_submit, .bs_cmd_done = bs_sg_cmd_done, }; +static struct device_type_template sg_template = { + .type = 0, + .lu_init = bs_sg_lu_init, + .lu_config = spc_lu_config, + .lu_online = spc_lu_online, + .lu_offline = spc_lu_offline, + .lu_exit = spc_lu_exit, + .cmd_passthrough = bs_sg_rw, +}; + __attribute__((constructor)) static void bs_sg_constructor(void) { register_backingstore_template(&sg_bst); + device_type_register(&sg_template); } -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html |