Eric Lee / smarc-fsl-linux-kernel

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drivers/md/dm-sysfs.c 2.16 KB
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784aae735   Milan Broz   dm: add name and ... 
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  /*
   * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
   *
   * This file is released under the GPL.
   */
  
  #include <linux/sysfs.h>
  #include <linux/dm-ioctl.h>
  #include "dm.h"
  
  struct dm_sysfs_attr {
  	struct attribute attr;
  	ssize_t (*show)(struct mapped_device *, char *);
  	ssize_t (*store)(struct mapped_device *, char *);
  };
  
  #define DM_ATTR_RO(_name) \
  struct dm_sysfs_attr dm_attr_##_name = \
  	__ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
  
  static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
  			    char *page)
  {
  	struct dm_sysfs_attr *dm_attr;
  	struct mapped_device *md;
  	ssize_t ret;
  
  	dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
  	if (!dm_attr->show)
  		return -EIO;
  
  	md = dm_get_from_kobject(kobj);
  	if (!md)
  		return -EINVAL;
  
  	ret = dm_attr->show(md, page);
  	dm_put(md);
  
  	return ret;
  }
  
  static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
  {
  	if (dm_copy_name_and_uuid(md, buf, NULL))
  		return -EIO;
  
  	strcat(buf, "
  ");
  	return strlen(buf);
  }
  
  static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
  {
  	if (dm_copy_name_and_uuid(md, NULL, buf))
  		return -EIO;
  
  	strcat(buf, "
  ");
  	return strlen(buf);
  }
486d220fe   Peter Rajnoha   dm: sysfs add sus... 
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  static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
  {
4f186f8bb   Kiyoshi Ueda   dm: rename dm_sus... 
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  	sprintf(buf, "%d
  ", dm_suspended_md(md));
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  	return strlen(buf);
  }
784aae735   Milan Broz   dm: add name and ... 
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  static DM_ATTR_RO(name);
  static DM_ATTR_RO(uuid);
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  static DM_ATTR_RO(suspended);
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  static struct attribute *dm_attrs[] = {
  	&dm_attr_name.attr,
  	&dm_attr_uuid.attr,
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  	&dm_attr_suspended.attr,
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  	NULL,
  };
52cf25d0a   Emese Revfy   Driver core: Cons... 
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  static const struct sysfs_ops dm_sysfs_ops = {
784aae735   Milan Broz   dm: add name and ... 
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  	.show	= dm_attr_show,
  };
  
  /*
   * dm kobject is embedded in mapped_device structure
   * no need to define release function here
   */
  static struct kobj_type dm_ktype = {
  	.sysfs_ops	= &dm_sysfs_ops,
  	.default_attrs	= dm_attrs,
  };
  
  /*
   * Initialize kobj
   * because nobody using md yet, no need to call explicit dm_get/put
   */
  int dm_sysfs_init(struct mapped_device *md)
  {
  	return kobject_init_and_add(dm_kobject(md), &dm_ktype,
  				    &disk_to_dev(dm_disk(md))->kobj,
  				    "%s", "dm");
  }
  
  /*
   * Remove kobj, called after all references removed
   */
  void dm_sysfs_exit(struct mapped_device *md)
  {
  	kobject_put(dm_kobject(md));
  }