Release 4.10 fs/sysfs/group.c

/*
 * fs/sysfs/group.c - Operations for adding/removing multiple files at once.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2013 Greg Kroah-Hartman
 * Copyright (c) 2013 The Linux Foundation
 *
 * This file is released undert the GPL v2.
 *
 */

#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/err.h>
#include "sysfs.h"




static void remove_files(struct kernfs_node *parent,
			 const struct attribute_group *grp)
{
	struct attribute *const *attr;
	struct bin_attribute *const *bin_attr;

	if (grp->attrs)
		for (attr = grp->attrs; *attr; attr++)
			kernfs_remove_by_name(parent, (*attr)->name);
	if (grp->bin_attrs)
		for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++)
			kernfs_remove_by_name(parent, (*bin_attr)->attr.name);
}

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patrick mochel
patrick mochel
46
47.42%
3
37.50%
greg kroah-hartman
greg kroah-hartman
38
39.18%
1
12.50%
robert abel
robert abel
8
8.25%
1
12.50%
tejun heo
tejun heo
4
4.12%
2
25.00%
james bottomley
james bottomley
1
1.03%
1
12.50%
Total
97
100.00%
8
100.00%



static int create_files(struct kernfs_node *parent, struct kobject *kobj,
			const struct attribute_group *grp, int update)
{
	struct attribute *const *attr;
	struct bin_attribute *const *bin_attr;
	int error = 0, i;

	if (grp->attrs) {
		for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) {
			umode_t mode = (*attr)->mode;

			/*
                         * In update mode, we're changing the permissions or
                         * visibility.  Do this by first removing then
                         * re-adding (if required) the file.
                         */
			if (update)
				kernfs_remove_by_name(parent, (*attr)->name);
			if (grp->is_visible) {
				mode = grp->is_visible(kobj, *attr, i);
				if (!mode)
					continue;
			}

			WARN(mode & ~(SYSFS_PREALLOC | 0664),
			     "Attribute %s: Invalid permissions 0%o\n",
			     (*attr)->name, mode);

			mode &= SYSFS_PREALLOC | 0664;
			error = sysfs_add_file_mode_ns(parent, *attr, false,
						       mode, NULL);
			if (unlikely(error))
				break;
		}
		if (error) {
			remove_files(parent, grp);
			goto exit;
		}
	}

	if (grp->bin_attrs) {
		for (i = 0, bin_attr = grp->bin_attrs; *bin_attr; i++, bin_attr++) {
			umode_t mode = (*bin_attr)->attr.mode;

			if (update)
				kernfs_remove_by_name(parent,
						(*bin_attr)->attr.name);
			if (grp->is_bin_visible) {
				mode = grp->is_bin_visible(kobj, *bin_attr, i);
				if (!mode)
					continue;
			}

			WARN(mode & ~(SYSFS_PREALLOC | 0664),
			     "Attribute %s: Invalid permissions 0%o\n",
			     (*bin_attr)->attr.name, mode);

			mode &= SYSFS_PREALLOC | 0664;
			error = sysfs_add_file_mode_ns(parent,
					&(*bin_attr)->attr, true,
					mode, NULL);
			if (error)
				break;
		}
		if (error)
			remove_files(parent, grp);
	}
exit:
	return error;
}


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greg kroah-hartman
greg kroah-hartman
79
21.58%
1
6.25%
emilio lopez
emilio lopez
76
20.77%
1
6.25%
james bottomley
james bottomley
75
20.49%
2
12.50%
patrick mochel
patrick mochel
64
17.49%
3
18.75%
vivien didelot
vivien didelot
29
7.92%
1
6.25%
cody p schafer
cody p schafer
24
6.56%
1
6.25%
tejun heo
tejun heo
11
3.01%
4
25.00%
guenter roeck
guenter roeck
6
1.64%
1
6.25%
andrew morton
andrew morton
1
0.27%
1
6.25%
al viro
al viro
1
0.27%
1
6.25%
Total
366
100.00%
16
100.00%



static int internal_create_group(struct kobject *kobj, int update,
				 const struct attribute_group *grp)
{
	struct kernfs_node *kn;
	int error;

	BUG_ON(!kobj || (!update && !kobj->sd));

	/* Updates may happen before the object has been instantiated */
	if (unlikely(update && !kobj->sd))
		return -EINVAL;
	if (!grp->attrs && !grp->bin_attrs) {
		WARN(1, "sysfs: (bin_)attrs not set by subsystem for group: %s/%s\n",
			kobj->name, grp->name ?: "");
		return -EINVAL;
	}
	if (grp->name) {
		kn = kernfs_create_dir(kobj->sd, grp->name,
				       S_IRWXU | S_IRUGO | S_IXUGO, kobj);
		if (IS_ERR(kn)) {
			if (PTR_ERR(kn) == -EEXIST)
				sysfs_warn_dup(kobj->sd, grp->name);
			return PTR_ERR(kn);
		}
	} else
		kn = kobj->sd;
	kernfs_get(kn);
	error = create_files(kn, kobj, grp, update);
	if (error) {
		if (grp->name)
			kernfs_remove(kn);
	}
	kernfs_put(kn);
	return error;
}

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patrick mochel
patrick mochel
76
35.85%
3
18.75%
tejun heo
tejun heo
58
27.36%
6
37.50%
james bottomley
james bottomley
31
14.62%
2
12.50%
bruno premont
bruno premont
29
13.68%
1
6.25%
andrew morton
andrew morton
11
5.19%
2
12.50%
oliver schinagl
oliver schinagl
6
2.83%
1
6.25%
javi merino
javi merino
1
0.47%
1
6.25%
Total
212
100.00%
16
100.00%

/**
 * sysfs_create_group - given a directory kobject, create an attribute group
 * @kobj:       The kobject to create the group on
 * @grp:        The attribute group to create
 *
 * This function creates a group for the first time.  It will explicitly
 * warn and error if any of the attribute files being created already exist.
 *
 * Returns 0 on success or error code on failure.
 */


int sysfs_create_group(struct kobject *kobj,
		       const struct attribute_group *grp)
{
	return internal_create_group(kobj, 0, grp);
}
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james bottomley
james bottomley
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1
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26
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1
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EXPORT_SYMBOL_GPL(sysfs_create_group);

/**
 * sysfs_create_groups - given a directory kobject, create a bunch of attribute groups
 * @kobj:       The kobject to create the group on
 * @groups:     The attribute groups to create, NULL terminated
 *
 * This function creates a bunch of attribute groups.  If an error occurs when
 * creating a group, all previously created groups will be removed, unwinding
 * everything back to the original state when this function was called.
 * It will explicitly warn and error if any of the attribute files being
 * created already exist.
 *
 * Returns 0 on success or error code from sysfs_create_group on failure.
 */


int sysfs_create_groups(struct kobject *kobj,
			const struct attribute_group **groups)
{
	int error = 0;
	int i;

	if (!groups)
		return 0;

	for (i = 0; groups[i]; i++) {
		error = sysfs_create_group(kobj, groups[i]);
		if (error) {
			while (--i >= 0)
				sysfs_remove_group(kobj, groups[i]);
			break;
		}
	}
	return error;
}
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greg kroah-hartman
greg kroah-hartman
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1
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88
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(sysfs_create_groups);

/**
 * sysfs_update_group - given a directory kobject, update an attribute group
 * @kobj:       The kobject to update the group on
 * @grp:        The attribute group to update
 *
 * This function updates an attribute group.  Unlike
 * sysfs_create_group(), it will explicitly not warn or error if any
 * of the attribute files being created already exist.  Furthermore,
 * if the visibility of the files has changed through the is_visible()
 * callback, it will update the permissions and add or remove the
 * relevant files.
 *
 * The primary use for this function is to call it after making a change
 * that affects group visibility.
 *
 * Returns 0 on success or error code on failure.
 */


int sysfs_update_group(struct kobject *kobj,
		       const struct attribute_group *grp)
{
	return internal_create_group(kobj, 1, grp);
}
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james bottomley
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1
100.00%


EXPORT_SYMBOL_GPL(sysfs_update_group);

/**
 * sysfs_remove_group: remove a group from a kobject
 * @kobj:       kobject to remove the group from
 * @grp:        group to remove
 *
 * This function removes a group of attributes from a kobject.  The attributes
 * previously have to have been created for this group, otherwise it will fail.
 */


void sysfs_remove_group(struct kobject *kobj,
			const struct attribute_group *grp)
{
	struct kernfs_node *parent = kobj->sd;
	struct kernfs_node *kn;

	if (grp->name) {
		kn = kernfs_find_and_get(parent, grp->name);
		if (!kn) {
			WARN(!kn, KERN_WARNING
			     "sysfs group '%s' not found for kobject '%s'\n",
			     grp->name, kobject_name(kobj));
			return;
		}
	} else {
		kn = parent;
		kernfs_get(kn);
	}

	remove_files(kn, grp);
	if (grp->name)
		kernfs_remove(kn);

	kernfs_put(kn);
}
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patrick mochel
patrick mochel
51
46.36%
2
18.18%
tejun heo
tejun heo
29
26.36%
4
36.36%
greg kroah-hartman
greg kroah-hartman
18
16.36%
1
9.09%
andrew morton
andrew morton
4
3.64%
1
9.09%
johannes thumshirn
johannes thumshirn
3
2.73%
1
9.09%
arjan van de ven
arjan van de ven
3
2.73%
1
9.09%
james morris
james morris
2
1.82%
1
9.09%
Total
110
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(sysfs_remove_group);

/**
 * sysfs_remove_groups - remove a list of groups
 *
 * @kobj:       The kobject for the groups to be removed from
 * @groups:     NULL terminated list of groups to be removed
 *
 * If groups is not NULL, remove the specified groups from the kobject.
 */


void sysfs_remove_groups(struct kobject *kobj,
			 const struct attribute_group **groups)
{
	int i;

	if (!groups)
		return;
	for (i = 0; groups[i]; i++)
		sysfs_remove_group(kobj, groups[i]);
}
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1
100.00%


EXPORT_SYMBOL_GPL(sysfs_remove_groups);

/**
 * sysfs_merge_group - merge files into a pre-existing attribute group.
 * @kobj:       The kobject containing the group.
 * @grp:        The files to create and the attribute group they belong to.
 *
 * This function returns an error if the group doesn't exist or any of the
 * files already exist in that group, in which case none of the new files
 * are created.
 */


int sysfs_merge_group(struct kobject *kobj,
		       const struct attribute_group *grp)
{
	struct kernfs_node *parent;
	int error = 0;
	struct attribute *const *attr;
	int i;

	parent = kernfs_find_and_get(kobj->sd, grp->name);
	if (!parent)
		return -ENOENT;

	for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
		error = sysfs_add_file(parent, *attr, false);
	if (error) {
		while (--i >= 0)
			kernfs_remove_by_name(parent, (*--attr)->name);
	}
	kernfs_put(parent);

	return error;
}
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alan stern
alan stern
121
91.67%
1
20.00%
tejun heo
tejun heo
11
8.33%
4
80.00%
Total
132
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(sysfs_merge_group);

/**
 * sysfs_unmerge_group - remove files from a pre-existing attribute group.
 * @kobj:       The kobject containing the group.
 * @grp:        The files to remove and the attribute group they belong to.
 */


void sysfs_unmerge_group(struct kobject *kobj,
		       const struct attribute_group *grp)
{
	struct kernfs_node *parent;
	struct attribute *const *attr;

	parent = kernfs_find_and_get(kobj->sd, grp->name);
	if (parent) {
		for (attr = grp->attrs; *attr; ++attr)
			kernfs_remove_by_name(parent, (*attr)->name);
		kernfs_put(parent);
	}
}
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alan stern
alan stern
69
88.46%
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tejun heo
tejun heo
9
11.54%
3
75.00%
Total
78
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(sysfs_unmerge_group);

/**
 * sysfs_add_link_to_group - add a symlink to an attribute group.
 * @kobj:       The kobject containing the group.
 * @group_name: The name of the group.
 * @target:     The target kobject of the symlink to create.
 * @link_name:  The name of the symlink to create.
 */


int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
			    struct kobject *target, const char *link_name)
{
	struct kernfs_node *parent;
	int error = 0;

	parent = kernfs_find_and_get(kobj->sd, group_name);
	if (!parent)
		return -ENOENT;

	error = sysfs_create_link_sd(parent, target, link_name);
	kernfs_put(parent);

	return error;
}
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rafael j. wysocki
rafael j. wysocki
66
89.19%
1
33.33%
tejun heo
tejun heo
8
10.81%
2
66.67%
Total
74
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(sysfs_add_link_to_group);

/**
 * sysfs_remove_link_from_group - remove a symlink from an attribute group.
 * @kobj:       The kobject containing the group.
 * @group_name: The name of the group.
 * @link_name:  The name of the symlink to remove.
 */


void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
				  const char *link_name)
{
	struct kernfs_node *parent;

	parent = kernfs_find_and_get(kobj->sd, group_name);
	if (parent) {
		kernfs_remove_by_name(parent, link_name);
		kernfs_put(parent);
	}
}
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rafael j. wysocki
rafael j. wysocki
45
83.33%
1
25.00%
tejun heo
tejun heo
9
16.67%
3
75.00%
Total
54
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group);

/**
 * __compat_only_sysfs_link_entry_to_kobj - add a symlink to a kobject pointing
 * to a group or an attribute
 * @kobj:               The kobject containing the group.
 * @target_kobj:        The target kobject.
 * @target_name:        The name of the target group or attribute.
 */


int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
				      struct kobject *target_kobj,
				      const char *target_name)
{
	struct kernfs_node *target;
	struct kernfs_node *entry;
	struct kernfs_node *link;

	/*
         * We don't own @target_kobj and it may be removed at any time.
         * Synchronize using sysfs_symlink_target_lock. See sysfs_remove_dir()
         * for details.
         */
	spin_lock(&sysfs_symlink_target_lock);
	target = target_kobj->sd;
	if (target)
		kernfs_get(target);
	spin_unlock(&sysfs_symlink_target_lock);
	if (!target)
		return -ENOENT;

	entry = kernfs_find_and_get(target_kobj->sd, target_name);
	if (!entry) {
		kernfs_put(target);
		return -ENOENT;
	}

	link = kernfs_create_link(kobj->sd, target_name, entry);
	if (IS_ERR(link) && PTR_ERR(link) == -EEXIST)
		sysfs_warn_dup(kobj->sd, target_name);

	kernfs_put(entry);
	kernfs_put(target);
	return IS_ERR(link) ? PTR_ERR(link) : 0;
}
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jarkko sakkinen
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1
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159
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1
100.00%


EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);
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greg kroah-hartman
greg kroah-hartman
301
19.41%
7
17.50%
patrick mochel
patrick mochel
252
16.25%
4
10.00%
alan stern
alan stern
202
13.02%
1
2.50%
jarkko sakkinen
jarkko sakkinen
165
10.64%
1
2.50%
james bottomley
james bottomley
159
10.25%
2
5.00%
tejun heo
tejun heo
139
8.96%
8
20.00%
rafael j. wysocki
rafael j. wysocki
123
7.93%
1
2.50%
emilio lopez
emilio lopez
76
4.90%
1
2.50%
bruno premont
bruno premont
29
1.87%
1
2.50%
vivien didelot
vivien didelot
29
1.87%
1
2.50%
cody p schafer
cody p schafer
24
1.55%
1
2.50%
andrew morton
andrew morton
16
1.03%
2
5.00%
robert abel
robert abel
8
0.52%
1
2.50%
guenter roeck
guenter roeck
6
0.39%
1
2.50%
oliver schinagl
oliver schinagl
6
0.39%
1
2.50%
antonio ospite
antonio ospite
3
0.19%
1
2.50%
johannes thumshirn
johannes thumshirn
3
0.19%
1
2.50%
arjan van de ven
arjan van de ven
3
0.19%
1
2.50%
christoph hellwig
christoph hellwig
3
0.19%
1
2.50%
james morris
james morris
2
0.13%
1
2.50%
al viro
al viro
1
0.06%
1
2.50%
javi merino
javi merino
1
0.06%
1
2.50%
Total
1551
100.00%
40
100.00%
Directory: fs/sysfs

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