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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>
This commit is contained in:
Nicholas Bellinger 2011-08-10 18:41:14 -07:00
parent 72f4ba1e32
commit 7abbe7f3e4
1 changed files with 7 additions and 7 deletions
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14
drivers/target/target_core_transport.c
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@ -2853,12 +2853,10 @@ static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
" 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 @@ static int transport_generic_cmd_sequencer(
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]);