fs/btrfs/sysfs.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2007 Oracle.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
  * License v2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public
  * License along with this program; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 021110-1307, USA.
  */

 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/completion.h>
 #include <linux/buffer_head.h>
 #include <linux/module.h>
 #include <linux/kobject.h>

 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"

 static ssize_t root_blocks_used_show(struct btrfs_root *root, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 		(unsigned long long)btrfs_root_used(&root->root_item));
 }

 static ssize_t root_block_limit_show(struct btrfs_root *root, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 		(unsigned long long)btrfs_root_limit(&root->root_item));
 }

 static ssize_t super_blocks_used_show(struct btrfs_fs_info *fs, char *buf)
 {

 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 		(unsigned long long)btrfs_super_bytes_used(&fs->super_copy));
 }

 static ssize_t super_total_blocks_show(struct btrfs_fs_info *fs, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 		(unsigned long long)btrfs_super_total_bytes(&fs->super_copy));
 }

 static ssize_t super_blocksize_show(struct btrfs_fs_info *fs, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 		(unsigned long long)btrfs_super_sectorsize(&fs->super_copy));
 }

 /* this is for root attrs (subvols/snapshots) */
 struct btrfs_root_attr {
 	struct attribute attr;
 	ssize_t (*show)(struct btrfs_root *, char *);
 	ssize_t (*store)(struct btrfs_root *, const char *, size_t);
 };

 #define ROOT_ATTR(name, mode, show, store) \
 static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, \
 							      show, store)

 ROOT_ATTR(blocks_used,	0444,	root_blocks_used_show,	NULL);
 ROOT_ATTR(block_limit,	0644,	root_block_limit_show,	NULL);

 static struct attribute *btrfs_root_attrs[] = {
 	&btrfs_root_attr_blocks_used.attr,
 	&btrfs_root_attr_block_limit.attr,
 	NULL,
 };

 /* this is for super attrs (actual full fs) */
 struct btrfs_super_attr {
 	struct attribute attr;
 	ssize_t (*show)(struct btrfs_fs_info *, char *);
 	ssize_t (*store)(struct btrfs_fs_info *, const char *, size_t);
 };

 #define SUPER_ATTR(name, mode, show, store) \
 static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, \
 								show, store)

 SUPER_ATTR(blocks_used,		0444,	super_blocks_used_show,		NULL);
 SUPER_ATTR(total_blocks,	0444,	super_total_blocks_show,	NULL);
 SUPER_ATTR(blocksize,		0444,	super_blocksize_show,		NULL);

 static struct attribute *btrfs_super_attrs[] = {
 	&btrfs_super_attr_blocks_used.attr,
 	&btrfs_super_attr_total_blocks.attr,
 	&btrfs_super_attr_blocksize.attr,
 	NULL,
 };

 static ssize_t btrfs_super_attr_show(struct kobject *kobj,
 				    struct attribute *attr, char *buf)
 {
 	struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
 						super_kobj);
 	struct btrfs_super_attr *a = container_of(attr,
 						  struct btrfs_super_attr,
 						  attr);

 	return a->show ? a->show(fs, buf) : 0;
 }

 static ssize_t btrfs_super_attr_store(struct kobject *kobj,
 				     struct attribute *attr,
 				     const char *buf, size_t len)
 {
 	struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
 						super_kobj);
 	struct btrfs_super_attr *a = container_of(attr,
 						  struct btrfs_super_attr,
 						  attr);

 	return a->store ? a->store(fs, buf, len) : 0;
 }

 static ssize_t btrfs_root_attr_show(struct kobject *kobj,
 				    struct attribute *attr, char *buf)
 {
 	struct btrfs_root *root = container_of(kobj, struct btrfs_root,
 						root_kobj);
 	struct btrfs_root_attr *a = container_of(attr,
 						 struct btrfs_root_attr,
 						 attr);

 	return a->show ? a->show(root, buf) : 0;
 }

 static ssize_t btrfs_root_attr_store(struct kobject *kobj,
 				     struct attribute *attr,
 				     const char *buf, size_t len)
 {
 	struct btrfs_root *root = container_of(kobj, struct btrfs_root,
 						root_kobj);
 	struct btrfs_root_attr *a = container_of(attr,
 						 struct btrfs_root_attr,
 						 attr);
 	return a->store ? a->store(root, buf, len) : 0;
 }

 static void btrfs_super_release(struct kobject *kobj)
 {
 	struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
 						super_kobj);
 	complete(&fs->kobj_unregister);
 }

 static void btrfs_root_release(struct kobject *kobj)
 {
 	struct btrfs_root *root = container_of(kobj, struct btrfs_root,
 						root_kobj);
 	complete(&root->kobj_unregister);
 }

 static const struct sysfs_ops btrfs_super_attr_ops = {
 	.show	= btrfs_super_attr_show,
 	.store	= btrfs_super_attr_store,
 };

 static const struct sysfs_ops btrfs_root_attr_ops = {
 	.show	= btrfs_root_attr_show,
 	.store	= btrfs_root_attr_store,
 };

 static struct kobj_type btrfs_root_ktype = {
 	.default_attrs	= btrfs_root_attrs,
 	.sysfs_ops	= &btrfs_root_attr_ops,
 	.release	= btrfs_root_release,
 };

 static struct kobj_type btrfs_super_ktype = {
 	.default_attrs	= btrfs_super_attrs,
 	.sysfs_ops	= &btrfs_super_attr_ops,
 	.release	= btrfs_super_release,
 };

 /* /sys/fs/btrfs/ entry */
 static struct kset *btrfs_kset;

 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs)
 {
 	int error;
 	char *name;
 	char c;
 	int len = strlen(fs->sb->s_id) + 1;
 	int i;

 	name = kmalloc(len, GFP_NOFS);
 	if (!name) {
 		error = -ENOMEM;
 		goto fail;
 	}

 	for (i = 0; i < len; i++) {
 		c = fs->sb->s_id[i];
 		if (c == '/' || c == '\\')
 			c = '!';
 		name[i] = c;
 	}
 	name[len] = '\0';

 	fs->super_kobj.kset = btrfs_kset;
 	error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype,
 				     NULL, "%s", name);
 	kfree(name);
 	if (error)
 		goto fail;

 	return 0;

 fail:
 	printk(KERN_ERR "btrfs: sysfs creation for super failed\n");
 	return error;
 }

 int btrfs_sysfs_add_root(struct btrfs_root *root)
 {
 	int error;

 	error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype,
 				     &root->fs_info->super_kobj,
 				     "%s", root->name);
 	if (error)
 		goto fail;

 	return 0;

 fail:
 	printk(KERN_ERR "btrfs: sysfs creation for root failed\n");
 	return error;
 }

 void btrfs_sysfs_del_root(struct btrfs_root *root)
 {
 	kobject_put(&root->root_kobj);
 	wait_for_completion(&root->kobj_unregister);
 }

 void btrfs_sysfs_del_super(struct btrfs_fs_info *fs)
 {
 	kobject_put(&fs->super_kobj);
 	wait_for_completion(&fs->kobj_unregister);
 }

 int btrfs_init_sysfs(void)
 {
 	btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
 	if (!btrfs_kset)
 		return -ENOMEM;
 	return 0;
 }

 void btrfs_exit_sysfs(void)
 {
 	kset_unregister(btrfs_kset);
 }
	/*
	* Copyright (C) 2007 Oracle. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public
	* License v2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public
	* License along with this program; if not, write to the
	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	* Boston, MA 021110-1307, USA.
	*/

	#include <linux/sched.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/completion.h>
	#include <linux/buffer_head.h>
	#include <linux/module.h>
	#include <linux/kobject.h>

	#include "ctree.h"
	#include "disk-io.h"
	#include "transaction.h"

	static ssize_t root_blocks_used_show(struct btrfs_root root, char buf)
	{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
	(unsigned long long)btrfs_root_used(&root->root_item));
	}

	static ssize_t root_block_limit_show(struct btrfs_root root, char buf)
	{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
	(unsigned long long)btrfs_root_limit(&root->root_item));
	}

	static ssize_t super_blocks_used_show(struct btrfs_fs_info fs, char buf)
	{

	return snprintf(buf, PAGE_SIZE, "%llu\n",
	(unsigned long long)btrfs_super_bytes_used(&fs->super_copy));
	}

	static ssize_t super_total_blocks_show(struct btrfs_fs_info fs, char buf)
	{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
	(unsigned long long)btrfs_super_total_bytes(&fs->super_copy));
	}

	static ssize_t super_blocksize_show(struct btrfs_fs_info fs, char buf)
	{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
	(unsigned long long)btrfs_super_sectorsize(&fs->super_copy));
	}

	/* this is for root attrs (subvols/snapshots) */
	struct btrfs_root_attr {
	struct attribute attr;
	ssize_t (show)(struct btrfs_root , char *);
	ssize_t (store)(struct btrfs_root , const char *, size_t);
	};

	#define ROOT_ATTR(name, mode, show, store) \
	static struct btrfs_root_attr btrfs_root_attr_##name = __ATTR(name, mode, \
	show, store)

	ROOT_ATTR(blocks_used, 0444, root_blocks_used_show, NULL);
	ROOT_ATTR(block_limit, 0644, root_block_limit_show, NULL);

	static struct attribute *btrfs_root_attrs[] = {
	&btrfs_root_attr_blocks_used.attr,
	&btrfs_root_attr_block_limit.attr,
	NULL,
	};

	/* this is for super attrs (actual full fs) */
	struct btrfs_super_attr {
	struct attribute attr;
	ssize_t (show)(struct btrfs_fs_info , char *);
	ssize_t (store)(struct btrfs_fs_info , const char *, size_t);
	};

	#define SUPER_ATTR(name, mode, show, store) \
	static struct btrfs_super_attr btrfs_super_attr_##name = __ATTR(name, mode, \
	show, store)

	SUPER_ATTR(blocks_used, 0444, super_blocks_used_show, NULL);
	SUPER_ATTR(total_blocks, 0444, super_total_blocks_show, NULL);
	SUPER_ATTR(blocksize, 0444, super_blocksize_show, NULL);

	static struct attribute *btrfs_super_attrs[] = {
	&btrfs_super_attr_blocks_used.attr,
	&btrfs_super_attr_total_blocks.attr,
	&btrfs_super_attr_blocksize.attr,
	NULL,
	};

	static ssize_t btrfs_super_attr_show(struct kobject *kobj,
	struct attribute attr, char buf)
	{
	struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
	super_kobj);
	struct btrfs_super_attr *a = container_of(attr,
	struct btrfs_super_attr,
	attr);

	return a->show ? a->show(fs, buf) : 0;
	}

	static ssize_t btrfs_super_attr_store(struct kobject *kobj,
	struct attribute *attr,
	const char *buf, size_t len)
	{
	struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
	super_kobj);
	struct btrfs_super_attr *a = container_of(attr,
	struct btrfs_super_attr,
	attr);

	return a->store ? a->store(fs, buf, len) : 0;
	}

	static ssize_t btrfs_root_attr_show(struct kobject *kobj,
	struct attribute attr, char buf)
	{
	struct btrfs_root *root = container_of(kobj, struct btrfs_root,
	root_kobj);
	struct btrfs_root_attr *a = container_of(attr,
	struct btrfs_root_attr,
	attr);

	return a->show ? a->show(root, buf) : 0;
	}

	static ssize_t btrfs_root_attr_store(struct kobject *kobj,
	struct attribute *attr,
	const char *buf, size_t len)
	{
	struct btrfs_root *root = container_of(kobj, struct btrfs_root,
	root_kobj);
	struct btrfs_root_attr *a = container_of(attr,
	struct btrfs_root_attr,
	attr);
	return a->store ? a->store(root, buf, len) : 0;
	}

	static void btrfs_super_release(struct kobject *kobj)
	{
	struct btrfs_fs_info *fs = container_of(kobj, struct btrfs_fs_info,
	super_kobj);
	complete(&fs->kobj_unregister);
	}

	static void btrfs_root_release(struct kobject *kobj)
	{
	struct btrfs_root *root = container_of(kobj, struct btrfs_root,
	root_kobj);
	complete(&root->kobj_unregister);
	}

	static const struct sysfs_ops btrfs_super_attr_ops = {
	.show = btrfs_super_attr_show,
	.store = btrfs_super_attr_store,
	};

	static const struct sysfs_ops btrfs_root_attr_ops = {
	.show = btrfs_root_attr_show,
	.store = btrfs_root_attr_store,
	};

	static struct kobj_type btrfs_root_ktype = {
	.default_attrs = btrfs_root_attrs,
	.sysfs_ops = &btrfs_root_attr_ops,
	.release = btrfs_root_release,
	};

	static struct kobj_type btrfs_super_ktype = {
	.default_attrs = btrfs_super_attrs,
	.sysfs_ops = &btrfs_super_attr_ops,
	.release = btrfs_super_release,
	};

	/* /sys/fs/btrfs/ entry */
	static struct kset *btrfs_kset;

	int btrfs_sysfs_add_super(struct btrfs_fs_info *fs)
	{
	int error;
	char *name;
	char c;
	int len = strlen(fs->sb->s_id) + 1;
	int i;

	name = kmalloc(len, GFP_NOFS);
	if (!name) {
	error = -ENOMEM;
	goto fail;
	}

	for (i = 0; i < len; i++) {
	c = fs->sb->s_id[i];
	if (c == '/' \|\| c == '\\')
	c = '!';
	name[i] = c;
	}
	name[len] = '\0';

	fs->super_kobj.kset = btrfs_kset;
	error = kobject_init_and_add(&fs->super_kobj, &btrfs_super_ktype,
	NULL, "%s", name);
	kfree(name);
	if (error)
	goto fail;

	return 0;

	fail:
	printk(KERN_ERR "btrfs: sysfs creation for super failed\n");
	return error;
	}

	int btrfs_sysfs_add_root(struct btrfs_root *root)
	{
	int error;

	error = kobject_init_and_add(&root->root_kobj, &btrfs_root_ktype,
	&root->fs_info->super_kobj,
	"%s", root->name);
	if (error)
	goto fail;

	return 0;

	fail:
	printk(KERN_ERR "btrfs: sysfs creation for root failed\n");
	return error;
	}

	void btrfs_sysfs_del_root(struct btrfs_root *root)
	{
	kobject_put(&root->root_kobj);
	wait_for_completion(&root->kobj_unregister);
	}

	void btrfs_sysfs_del_super(struct btrfs_fs_info *fs)
	{
	kobject_put(&fs->super_kobj);
	wait_for_completion(&fs->kobj_unregister);
	}

	int btrfs_init_sysfs(void)
	{
	btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj);
	if (!btrfs_kset)
	return -ENOMEM;
	return 0;
	}

	void btrfs_exit_sysfs(void)
	{
	kset_unregister(btrfs_kset);
	}