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target: Don't return an error if disabling unsupported features 

If an attribute is present (but not yet supported) it should be OK
to write 0 (a no-op) to the attribute.

This is an issue because userspace should be able to save and restore all
set attribute values without error.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Andy Grover 2011-11-30 12:11:50 -08:00 committed by Nicholas Bellinger
parent 65b0c78d5a
commit c638830d04
1 changed files with 16 additions and 8 deletions
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24
drivers/target/target_core_device.c
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@ -954,8 +954,12 @@ int se_dev_set_emulate_dpo(struct se_device *dev, int flag)
return -EINVAL;
}
pr_err("dpo_emulated not supported\n");
return -EINVAL;
if (flag) {
pr_err("dpo_emulated not supported\n");
return -EINVAL;
}
return 0;
}
int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
@ -965,7 +969,7 @@ int se_dev_set_emulate_fua_write(struct se_device *dev, int flag)
return -EINVAL;
}
if (dev->transport->fua_write_emulated == 0) {
if (flag && dev->transport->fua_write_emulated == 0) {
pr_err("fua_write_emulated not supported\n");
return -EINVAL;
}
@ -982,8 +986,12 @@ int se_dev_set_emulate_fua_read(struct se_device *dev, int flag)
return -EINVAL;
}
pr_err("ua read emulated not supported\n");
return -EINVAL;
if (flag) {
pr_err("ua read emulated not supported\n");
return -EINVAL;
}
return 0;
}
int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
@ -992,7 +1000,7 @@ int se_dev_set_emulate_write_cache(struct se_device *dev, int flag)
pr_err("Illegal value %d\n", flag);
return -EINVAL;
}
if (dev->transport->write_cache_emulated == 0) {
if (flag && dev->transport->write_cache_emulated == 0) {
pr_err("write_cache_emulated not supported\n");
return -EINVAL;
}
@ -1053,7 +1061,7 @@ int se_dev_set_emulate_tpu(struct se_device *dev, int flag)
* We expect this value to be non-zero when generic Block Layer
* Discard supported is detected iblock_create_virtdevice().
*/
if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
pr_err("Generic Block Discard not supported\n");
return -ENOSYS;
}
@ -1074,7 +1082,7 @@ int se_dev_set_emulate_tpws(struct se_device *dev, int flag)
* We expect this value to be non-zero when generic Block Layer
* Discard supported is detected iblock_create_virtdevice().
*/
if (!dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
if (flag && !dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
pr_err("Generic Block Discard not supported\n");
return -ENOSYS;
}