configfs: Add CONFIGFS_ATTR_PERM helper

This new helper allows creating rw files with custom
permissions.

Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Link: https://lore.kernel.org/r/20250420104726.2963750-1-richard@nod.at
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>

diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index c771e9d0d0b92eee3826d5df1782e0cd5935fea2..698520b1bfdbc3437fd467b82accd8eac1672bc0 100644 (file)
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -120,15 +120,19 @@ struct configfs_attribute {
        ssize_t (*store)(struct config_item *, const char *, size_t);
 };
 
-#define CONFIGFS_ATTR(_pfx, _name)                     \
+#define CONFIGFS_ATTR_PERM(_pfx, _name, _perm)         \
 static struct configfs_attribute _pfx##attr_##_name = {        \
        .ca_name        = __stringify(_name),           \
-       .ca_mode        = S_IRUGO | S_IWUSR,            \
+       .ca_mode        = _perm,                        \
        .ca_owner       = THIS_MODULE,                  \
        .show           = _pfx##_name##_show,           \
        .store          = _pfx##_name##_store,          \
 }
 
+#define CONFIGFS_ATTR(_pfx, _name) CONFIGFS_ATTR_PERM( \
+               _pfx, _name, S_IRUGO | S_IWUSR          \
+)
+
 #define CONFIGFS_ATTR_RO(_pfx, _name)                  \
 static struct configfs_attribute _pfx##attr_##_name = {        \
        .ca_name        = __stringify(_name),           \