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| author | Christoph Hellwig | 2015-04-20 15:00:30 +0200 |
|---|---|---|
| committer | Nicholas Bellinger | 2015-05-31 07:41:44 +0200 |
| commit | 814e5b45182f4aaf6c0b0deac7104bc2cba5109e (patch) | |
| tree | a0cfcd51f0854718d2f8de018c893e5f65b3a8f7 /drivers/target/target_core_spc.c | |
| parent | iscsi-target: remove support for obsolete markers (diff) | |
| download | kernel-qcow2-linux-814e5b45182f4aaf6c0b0deac7104bc2cba5109e.tar.gz kernel-qcow2-linux-814e5b45182f4aaf6c0b0deac7104bc2cba5109e.tar.xz kernel-qcow2-linux-814e5b45182f4aaf6c0b0deac7104bc2cba5109e.zip | |
target: fix DPO and FUA bit checks
Drivers may override the WCE flag, in which case the DPOFUA flag in
MODE SENSE might differ from the check used to reject invalid FUA
bits in sbc_check_dpofua. Also now that we reject invalid FUA
bits early there is no need to duplicate the same buggy check
down in the fileio code.
As the DPOFUA flag controls th support for FUA bits on read and
write commands as well as DPO key off all the checks off a single
helper, and deprecate the emulate_dpo and emulate_fua_read attributs.
This fixes various failures in the libiscsi testsuite.
Personally I'd prefer to also remove the emulate_fua_write attribute
as there is no good reason to disable it, but I'll leave that for
a separate discussion.
Signed-off-by: Christoph Hellwig <hch@lst.de>
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 | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c index 7912aa124385..988c158cf65d 100644 --- a/drivers/target/target_core_spc.c +++ b/drivers/target/target_core_spc.c @@ -481,7 +481,7 @@ spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) buf[5] = 0x07; /* If WriteCache emulation is enabled, set V_SUP */ - if (se_dev_check_wce(dev)) + if (target_check_wce(dev)) buf[6] = 0x01; /* If an LBA map is present set R_SUP */ spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); @@ -888,7 +888,7 @@ static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) if (pc == 1) goto out; - if (se_dev_check_wce(dev)) + if (target_check_wce(dev)) p[2] = 0x04; /* Write Cache Enable */ p[12] = 0x20; /* Disabled Read Ahead */ @@ -1000,8 +1000,12 @@ static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY))) spc_modesense_write_protect(&buf[length], type); - if ((se_dev_check_wce(dev)) && - (dev->dev_attrib.emulate_fua_write > 0)) + /* + * SBC only allows us to enable FUA and DPO together. Fortunately + * DPO is explicitly specified as a hint, so a noop is a perfectly + * valid implementation. + */ + if (target_check_fua(dev)) spc_modesense_dpofua(&buf[length], type); ++length; |