target: Fix SYNCHRONIZE_CACHE zero LBA + range breakage
This patch fixes a SYNCHRONIZE_CACHE CDB handling bug with IBLOCK/FILEIO
backends where transport_cmd_get_valid_sectors() was incorrectly rejecting
a zero LBA + range CDB from being processed, and returning CHECK_CONDITION.
This includes changing transport_cmd_get_valid_sectors() to return '0' on
success and '-EINVAL' on failure (this makes more sense than sectors),
and to only check transport_cmd_get_valid_sectors() when a non zero LBA +
range SYNCHRONIZE_CACHE operation has been receieved for the non passthrough
case.
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index d35c2cc..d385c317 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2853,12 +2853,10 @@
" transport_dev_end_lba(): %llu\n",
cmd->t_task_lba, sectors,
transport_dev_end_lba(dev));
- pr_err(" We should return CHECK_CONDITION"
- " but we don't yet\n");
- return 0;
+ return -EINVAL;
}
- return sectors;
+ return 0;
}
static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
@@ -3350,10 +3348,12 @@
cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
/*
* Check to ensure that LBA + Range does not exceed past end of
- * device.
+ * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
*/
- if (!transport_cmd_get_valid_sectors(cmd))
- goto out_invalid_cdb_field;
+ if ((cmd->t_task_lba != 0) || (sectors != 0)) {
+ if (transport_cmd_get_valid_sectors(cmd) < 0)
+ goto out_invalid_cdb_field;
+ }
break;
case UNMAP:
size = get_unaligned_be16(&cdb[7]);
