configfs: add show and store methods to struct configfs_attribute
Add methods to struct configfs_attribute to directly show and store attributes without adding boilerplate code to every user. In addition to the methods this also adds 3 helper macros to define read/write, read-only and write-only attributes with a single line of code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -74,7 +74,11 @@ static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buf
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if (!buffer->page)
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return -ENOMEM;
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count = ops->show_attribute(item,attr,buffer->page);
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if (ops->show_attribute)
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count = ops->show_attribute(item, attr, buffer->page);
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else
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count = attr->show(item, buffer->page);
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buffer->needs_read_fill = 0;
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BUG_ON(count > (ssize_t)SIMPLE_ATTR_SIZE);
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if (count >= 0)
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@ -173,7 +177,9 @@ flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size
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struct config_item * item = to_item(dentry->d_parent);
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struct configfs_item_operations * ops = buffer->ops;
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return ops->store_attribute(item,attr,buffer->page,count);
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if (ops->store_attribute)
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return ops->store_attribute(item, attr, buffer->page, count);
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return attr->store(item, buffer->page, count);
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}
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@ -237,8 +243,8 @@ static int check_perm(struct inode * inode, struct file * file)
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* and we must have a store method.
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*/
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if (file->f_mode & FMODE_WRITE) {
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if (!(inode->i_mode & S_IWUGO) || !ops->store_attribute)
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if (!(inode->i_mode & S_IWUGO) ||
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(!ops->store_attribute && !attr->store))
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goto Eaccess;
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}
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@ -248,7 +254,8 @@ static int check_perm(struct inode * inode, struct file * file)
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* must be a show method for it.
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*/
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if (file->f_mode & FMODE_READ) {
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if (!(inode->i_mode & S_IRUGO) || !ops->show_attribute)
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if (!(inode->i_mode & S_IRUGO) ||
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(!ops->show_attribute && !attr->show))
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goto Eaccess;
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}
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@ -125,8 +125,35 @@ struct configfs_attribute {
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const char *ca_name;
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struct module *ca_owner;
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umode_t ca_mode;
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ssize_t (*show)(struct config_item *, char *);
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ssize_t (*store)(struct config_item *, const char *, size_t);
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};
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#define CONFIGFS_ATTR(_pfx, _name) \
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static struct configfs_attribute _pfx##attr_##_name = { \
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.ca_name = __stringify(_name), \
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.ca_mode = S_IRUGO | S_IWUSR, \
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.ca_owner = THIS_MODULE, \
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.show = _pfx##_name##_show, \
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.store = _pfx##_name##_store, \
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}
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#define CONFIGFS_ATTR_RO(_pfx, _name) \
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static struct configfs_attribute _pfx##attr_##_name = { \
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.ca_name = __stringify(_name), \
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.ca_mode = S_IRUGO, \
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.ca_owner = THIS_MODULE, \
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.show = _pfx##_name##_show, \
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}
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#define CONFIGFS_ATTR_WO(_pfx, _name) \
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static struct configfs_attribute _pfx##attr_##_name = { \
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.ca_name = __stringify(_name), \
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.ca_mode = S_IWUSR, \
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.ca_owner = THIS_MODULE, \
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.store = _pfx##_name##_store, \
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}
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/*
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* Users often need to create attribute structures for their configurable
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* attributes, containing a configfs_attribute member and function pointers
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