pi_prot_format conversion to write-only caused userspace breakage. Make
the ConfigFS path readable again and hardcode the "0\n" content,
matching previous output.
Fixes: 6baca7601bde ("scsi: target: drop unused pi_prot_format attribute storage")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1667505
Reported-by: Lee Duncan <lduncan@xxxxxxxx>
Reported-by: Laura Abbott <labbott@xxxxxxxxxx>
Signed-off-by: David Disseldorp <ddiss@xxxxxxx>
---
drivers/target/target_core_configfs.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 72016d0dfca5..8e7fffbb8802 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -852,6 +852,12 @@ static ssize_t pi_prot_type_store(struct config_item *item,
return count;
}
+/* always zero, but attr needs to remain RW to avoid userspace breakage */
+static ssize_t pi_prot_format_show(struct config_item *item, char *page)
+{
+ return snprintf(page, PAGE_SIZE, "0\n");
+}
+
static ssize_t pi_prot_format_store(struct config_item *item,
const char *page, size_t count)
{
@@ -1132,7 +1138,7 @@ CONFIGFS_ATTR(, emulate_3pc);
CONFIGFS_ATTR(, emulate_pr);
CONFIGFS_ATTR(, pi_prot_type);
CONFIGFS_ATTR_RO(, hw_pi_prot_type);
-CONFIGFS_ATTR_WO(, pi_prot_format);
+CONFIGFS_ATTR(, pi_prot_format);
CONFIGFS_ATTR(, pi_prot_verify);
CONFIGFS_ATTR(, enforce_pr_isids);
CONFIGFS_ATTR(, is_nonrot);
--
2.13.7
