diff options
author | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-01-06 16:10:37 -0800 |
---|---|---|
committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-01-09 15:21:40 -0800 |
commit | 046ba64285a4389ae5e9a7dfa253c6bff3d7c341 (patch) | |
tree | 8160b4c771df304f70cf7cfc155f6e7c152d0089 /drivers/target/target_core_spc.c | |
parent | 67e51daa5029417db86f1833f1b7b2212c454fe9 (diff) | |
download | linux-046ba64285a4389ae5e9a7dfa253c6bff3d7c341.tar.bz2 |
target: Drop arbitrary maximum I/O size limit
This patch drops the arbitrary maximum I/O size limit in sbc_parse_cdb(),
which currently for fabric_max_sectors is hardcoded to 8192 (4 MB for 512
byte sector devices), and for hw_max_sectors is a backend driver dependent
value.
This limit is problematic because Linux initiators have only recently
started to honor block limits MAXIMUM TRANSFER LENGTH, and other non-Linux
based initiators (eg: MSFT Fibre Channel) can also generate I/Os larger
than 4 MB in size.
Currently when this happens, the following message will appear on the
target resulting in I/Os being returned with non recoverable status:
SCSI OP 28h with too big sectors 16384 exceeds fabric_max_sectors: 8192
Instead, drop both [fabric,hw]_max_sector checks in sbc_parse_cdb(),
and convert the existing hw_max_sectors into a purely informational
attribute used to represent the granuality that backend driver and/or
subsystem code is splitting I/Os upon.
Also, update FILEIO with an explicit FD_MAX_BYTES check in fd_execute_rw()
to deal with the one special iovec limitiation case.
v2 changes:
- Drop hw_max_sectors check in sbc_parse_cdb()
Reported-by: Lance Gropper <lance.gropper@qosserver.com>
Reported-by: Stefan Priebe <s.priebe@profihost.ag>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org # 3.4
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_spc.c')
-rw-r--r-- | drivers/target/target_core_spc.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c index 1307600fe726..4c71657da56a 100644 --- a/drivers/target/target_core_spc.c +++ b/drivers/target/target_core_spc.c @@ -505,7 +505,6 @@ static sense_reason_t spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) { struct se_device *dev = cmd->se_dev; - u32 max_sectors; int have_tp = 0; int opt, min; @@ -539,9 +538,7 @@ spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) /* * Set MAXIMUM TRANSFER LENGTH */ - max_sectors = min(dev->dev_attrib.fabric_max_sectors, - dev->dev_attrib.hw_max_sectors); - put_unaligned_be32(max_sectors, &buf[8]); + put_unaligned_be32(dev->dev_attrib.hw_max_sectors, &buf[8]); /* * Set OPTIMAL TRANSFER LENGTH |