Hi Joel, What do you think..? Also, here is the drivers/lio-core/iscsi_target_configfs.c commit to convert to use to new parameters for CONFIGFS_ATTR_STRUCT() and CONFIGFS_ATTR_OPS(): http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=commitdiff;h=e305460ebaa92ce1f8542a55bd62648904fb2fd6 I don't see anyone except for drivers/lio-core and Documentation/filesystems/configfs/ using these macros.. If I can get an ACK I would be happy to update the examples. --nab >From 71fc659e337dcc5941f6f64f6c8abfb6b477fd7c Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> Date: Wed, 22 Oct 2008 14:49:01 -0700 Subject: [PATCH] [ConfigFS]: Extend CONFIGFS_ATTR_STRUCT() and CONFIGFS_ATTR_OPS() macros Extend CONFIGFS_ATTR_STRUCT() and CONFIGFS_ATTR_OPS() macros to allow multiple struct config_item or struct config_group to hang off the same structure. This means the previous '_item' arguement gets split into '_name' (for function and attribute structure names) and '_item' (the struct _item used throughout the macros that contains struct _item->my_config_group. This patch also removed the requirement for code using these macros to provide their own 'to_<name>()' function, which is now defined by CONFIGFS_ATTR_OPS() by passing the '_item_member' argument which is used inside of to_##_name() for locating struct _item *_item = container_of(). Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx> --- include/linux/configfs.h | 51 ++++++++++++++++++++++++++++------------------ 1 files changed, 31 insertions(+), 20 deletions(-) diff --git a/include/linux/configfs.h b/include/linux/configfs.h index 7f62777..2eab7ef 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -132,11 +132,13 @@ struct configfs_attribute { * attributes, containing a configfs_attribute member and function pointers * for the show() and store() operations on that attribute. If they don't * need anything else on the extended attribute structure, they can use - * this macro to define it The argument _item is the name of the - * config_item structure. + * this macro to define it. The argument _name isends up as + * 'struct _name_attribute, as well as names of to CONFIGFS_ATTR_OPS() below. + * The argument _item is the name of the structure containing the + * struct config_item or struct config_group structure members */ -#define CONFIGFS_ATTR_STRUCT(_item) \ -struct _item##_attribute { \ +#define CONFIGFS_ATTR_STRUCT(_name, _item) \ +struct _name##_attribute { \ struct configfs_attribute attr; \ ssize_t (*show)(struct _item *, char *); \ ssize_t (*store)(struct _item *, const char *, size_t); \ @@ -175,35 +177,44 @@ struct _item##_attribute { \ * With these extended attributes, the simple show_attribute() and * store_attribute() operations need to call the show() and store() of the * attributes. This is a common pattern, so we provide a macro to define - * them. The argument _item is the name of the config_item structure. - * This macro expects the attributes to be named "struct <name>_attribute" - * and the function to_<name>() to exist; + * them. The argument _name is the name of the attribute defined by + * CONFIGFS_ATTR_STRUCT(). The argument _item is the name of the structure + * containing the struct config_item or struct config_group structure member. + * The argument _item_member is the actual name of the struct config_* struct + * in your _item structure. Meaning my_structure->some_config_group. + * ^^_item^^^^^ ^^_item_member^^^ + * This macro expects the attributes to be named "struct <name>_attribute". */ -#define CONFIGFS_ATTR_OPS(_item) \ -static ssize_t _item##_attr_show(struct config_item *item, \ +#define CONFIGFS_ATTR_OPS(_name, _item, _item_member) \ +static struct _item *to_##_name(struct config_item *ci) \ +{ \ + return((ci) ? container_of(to_config_group(ci), struct _item, \ + _item_member) : NULL); \ +} \ +static ssize_t _name##_attr_show(struct config_item *item, \ struct configfs_attribute *attr, \ char *page) \ { \ - struct _item *_item = to_##_item(item); \ - struct _item##_attribute *_item##_attr = \ - container_of(attr, struct _item##_attribute, attr); \ + struct _item *_item = to_##_name(item); \ + struct _name##_attribute *_name##_attr = \ + container_of(attr, struct _name##_attribute, attr); \ ssize_t ret = 0; \ \ - if (_item##_attr->show) \ - ret = _item##_attr->show(_item, page); \ + if (_name##_attr->show) \ + ret = _name##_attr->show(_item, page); \ return ret; \ } \ -static ssize_t _item##_attr_store(struct config_item *item, \ +static ssize_t _name##_attr_store(struct config_item *item, \ struct configfs_attribute *attr, \ const char *page, size_t count) \ { \ - struct _item *_item = to_##_item(item); \ - struct _item##_attribute *_item##_attr = \ - container_of(attr, struct _item##_attribute, attr); \ + struct _item *_item = to_##_name(item); \ + struct _name##_attribute *_name##_attr = \ + container_of(attr, struct _name##_attribute, attr); \ ssize_t ret = -EINVAL; \ \ - if (_item##_attr->store) \ - ret = _item##_attr->store(_item, page, count); \ + if (_name##_attr->store) \ + ret = _name##_attr->store(_item, page, count); \ return ret; \ } -- 1.5.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
