diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-05-06 21:59:45 +0200 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-05-10 00:05:16 +0200 |
| commit | 7b4deef5d9a1fa74ccfbd07b4cfe795ee18fceca (patch) | |
| tree | 514d8cf753dd60c5e576226cf36590daa072ac01 /drivers/target | |
| parent | target: remove the t_se_count field in struct se_cmd (diff) | |
| download | linux-7b4deef5d9a1fa74ccfbd07b4cfe795ee18fceca.tar.xz linux-7b4deef5d9a1fa74ccfbd07b4cfe795ee18fceca.zip | |
target: Enforce hw_max_sectors for SCF_SCSI_DATA_SG_IO_CDB
Instead of depending upon a max_sectors value that may be set via
configfs based upon original HW queue limitations, go ahead and convert to using
the hw_max_sectors reported by the backend device in order to determine when
to reject an I/O's who's sector count exceeds what is supported by the backend
with a single se_cmd descriptor.
It addresses a potential case where se_dev_attrib.max_sectors for IBLOCK
backends has already been set via queue_max_sectors() to something small
like max_sectors=32 (LVM, DRBD may do this), resulting typically sized
SCF_SCSI_DATA_SG_IO_CDB to be incorrectly rejected with invalid_cdb_field
in transport_generic_cmd_sequencer().
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Roland Dreier <roland@purestorage.com>
Cc: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_transport.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 5c06b87a3114..a10d7847f037 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -2973,12 +2973,21 @@ static int transport_generic_cmd_sequencer( cmd->data_length = size; } - if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB && - (sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors || - sectors > dev->se_sub_dev->se_dev_attrib.max_sectors)) { - printk_ratelimited(KERN_ERR "SCSI OP %02xh with too big sectors %u\n", - cdb[0], sectors); - goto out_invalid_cdb_field; + if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { + if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) { + printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" + " big sectors %u exceeds fabric_max_sectors:" + " %u\n", cdb[0], sectors, + su_dev->se_dev_attrib.fabric_max_sectors); + goto out_invalid_cdb_field; + } + if (sectors > su_dev->se_dev_attrib.hw_max_sectors) { + printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" + " big sectors %u exceeds backend hw_max_sectors:" + " %u\n", cdb[0], sectors, + su_dev->se_dev_attrib.hw_max_sectors); + goto out_invalid_cdb_field; + } } /* reject any command that we don't have a handler for */ |