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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/kobject.h>#include <linux/module.h>#include <linux/dcache.h>#include <linux/namei.h>#include <linux/err.h>#include <linux/fs.h>#include "sysfs.h"
static void remove_files(struct kernfs_node *parent, const struct attribute_group *grp){ struct attribute *const *attr; const 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);}
static umode_t __first_visible(const struct attribute_group *grp, struct kobject *kobj){ if (grp->attrs && grp->attrs[0] && grp->is_visible) return grp->is_visible(kobj, grp->attrs[0], 0);
if (grp->attrs && grp->attrs[0] && grp->is_visible_const) return grp->is_visible_const(kobj, grp->attrs[0], 0);
if (grp->bin_attrs && grp->bin_attrs[0] && grp->is_bin_visible) return grp->is_bin_visible(kobj, grp->bin_attrs[0], 0);
return 0;}
static int create_files(struct kernfs_node *parent, struct kobject *kobj, kuid_t uid, kgid_t gid, const struct attribute_group *grp, int update){ struct attribute *const *attr; const 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 || grp->is_visible_const) { if (grp->is_visible) mode = grp->is_visible(kobj, *attr, i); else mode = grp->is_visible_const(kobj, *attr, i); mode &= ~SYSFS_GROUP_INVISIBLE; 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, mode, uid, gid, 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; size_t size = (*bin_attr)->size;
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); mode &= ~SYSFS_GROUP_INVISIBLE; if (!mode) continue; } if (grp->bin_size) size = grp->bin_size(kobj, *bin_attr, i);
WARN(mode & ~(SYSFS_PREALLOC | 0664), "Attribute %s: Invalid permissions 0%o\n", (*bin_attr)->attr.name, mode);
mode &= SYSFS_PREALLOC | 0664; error = sysfs_add_bin_file_mode_ns(parent, *bin_attr, mode, size, uid, gid, NULL); if (error) break; } if (error) remove_files(parent, grp); }exit: return error;}
static int internal_create_group(struct kobject *kobj, int update, const struct attribute_group *grp){ struct kernfs_node *kn; kuid_t uid; kgid_t gid; int error;
if (WARN_ON(!kobj || (!update && !kobj->sd))) return -EINVAL;
/* Updates may happen before the object has been instantiated */ if (unlikely(update && !kobj->sd)) return -EINVAL;
if (!grp->attrs && !grp->bin_attrs) { pr_debug("sysfs: (bin_)attrs not set by subsystem for group: %s/%s, skipping\n", kobj->name, grp->name ?: ""); return 0; }
kobject_get_ownership(kobj, &uid, &gid); if (grp->name) { umode_t mode = __first_visible(grp, kobj);
if (mode & SYSFS_GROUP_INVISIBLE) mode = 0; else mode = S_IRWXU | S_IRUGO | S_IXUGO;
if (update) { kn = kernfs_find_and_get(kobj->sd, grp->name); if (!kn) { pr_debug("attr grp %s/%s not created yet\n", kobj->name, grp->name); /* may have been invisible prior to this update */ update = 0; } else if (!mode) { sysfs_remove_group(kobj, grp); kernfs_put(kn); return 0; } }
if (!update) { if (!mode) return 0; kn = kernfs_create_dir_ns(kobj->sd, grp->name, mode, uid, gid, kobj, NULL); 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, uid, gid, grp, update); if (error) { if (grp->name && !update) kernfs_remove(kn); } kernfs_put(kn);
if (grp->name && update) kernfs_put(kn);
return error;}
/** * 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);}EXPORT_SYMBOL_GPL(sysfs_create_group);
static int internal_create_groups(struct kobject *kobj, int update, const struct attribute_group *const *groups){ int error = 0; int i;
if (!groups) return 0;
for (i = 0; groups[i]; i++) { error = internal_create_group(kobj, update, groups[i]); if (error) { while (--i >= 0) sysfs_remove_group(kobj, groups[i]); break; } } return error;}
/** * 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 *const *groups){ return internal_create_groups(kobj, 0, groups);}EXPORT_SYMBOL_GPL(sysfs_create_groups);
/** * sysfs_update_groups - given a directory kobject, create a bunch of attribute groups * @kobj: The kobject to update the group on * @groups: The attribute groups to update, NULL terminated * * This function update a bunch of attribute groups. If an error occurs when * updating a group, all previously updated groups will be removed together * with already existing (not updated) attributes. * * Returns 0 on success or error code from sysfs_update_group on failure. */int sysfs_update_groups(struct kobject *kobj, const struct attribute_group *const *groups){ return internal_create_groups(kobj, 1, groups);}EXPORT_SYMBOL_GPL(sysfs_update_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. Changing a group's name (subdirectory name under * kobj's directory in sysfs) is not allowed. * * 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);}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) { pr_debug("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);}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 *const *groups){ int i;
if (!groups) return; for (i = 0; groups[i]; i++) sysfs_remove_group(kobj, groups[i]);}EXPORT_SYMBOL_GPL(sysfs_remove_groups);
/** * sysfs_merge_group - merge files into a pre-existing named 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, the .name field is * NULL 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; kuid_t uid; kgid_t gid; int error = 0; struct attribute *const *attr; int i;
parent = kernfs_find_and_get(kobj->sd, grp->name); if (!parent) return -ENOENT;
kobject_get_ownership(kobj, &uid, &gid);
for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr)) error = sysfs_add_file_mode_ns(parent, *attr, (*attr)->mode, uid, gid, NULL); if (error) { while (--i >= 0) kernfs_remove_by_name(parent, (*--attr)->name); } kernfs_put(parent);
return error;}EXPORT_SYMBOL_GPL(sysfs_merge_group);
/** * sysfs_unmerge_group - remove files from a pre-existing named 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); }}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;}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); }}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. * @symlink_name: The name of the symlink file (target_name will be * considered if symlink_name is NULL). */int compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj, struct kobject *target_kobj, const char *target_name, const char *symlink_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, target_name); if (!entry) { kernfs_put(target); return -ENOENT; }
if (!symlink_name) symlink_name = target_name;
link = kernfs_create_link(kobj->sd, symlink_name, entry); if (PTR_ERR(link) == -EEXIST) sysfs_warn_dup(kobj->sd, symlink_name);
kernfs_put(entry); kernfs_put(target); return PTR_ERR_OR_ZERO(link);}EXPORT_SYMBOL_GPL(compat_only_sysfs_link_entry_to_kobj);
static int sysfs_group_attrs_change_owner(struct kobject *kobj, struct kernfs_node *grp_kn, const struct attribute_group *grp, struct iattr *newattrs){ struct kernfs_node *kn; int error, i; umode_t mode;
if (grp->attrs) { struct attribute *const *attr;
for (i = 0, attr = grp->attrs; *attr; i++, attr++) { if (grp->is_visible || grp->is_visible_const) { if (grp->is_visible) mode = grp->is_visible(kobj, *attr, i); else mode = grp->is_visible_const(kobj, *attr, i); if (mode & SYSFS_GROUP_INVISIBLE) break; if (!mode) continue; } kn = kernfs_find_and_get(grp_kn, (*attr)->name); if (!kn) return -ENOENT;
error = kernfs_setattr(kn, newattrs); kernfs_put(kn); if (error) return error; } }
if (grp->bin_attrs) { const struct bin_attribute *const *bin_attr;
for (i = 0, bin_attr = grp->bin_attrs; *bin_attr; i++, bin_attr++) { if (grp->is_bin_visible) { mode = grp->is_bin_visible(kobj, *bin_attr, i); if (mode & SYSFS_GROUP_INVISIBLE) break; if (!mode) continue; } kn = kernfs_find_and_get(grp_kn, (*bin_attr)->attr.name); if (!kn) return -ENOENT;
error = kernfs_setattr(kn, newattrs); kernfs_put(kn); if (error) return error; } }
return 0;}
/** * sysfs_group_change_owner - change owner of an attribute group. * @kobj: The kobject containing the group. * @grp: The attribute group. * @kuid: new owner's kuid * @kgid: new owner's kgid * * Returns 0 on success or error code on failure. */int sysfs_group_change_owner(struct kobject *kobj, const struct attribute_group *grp, kuid_t kuid, kgid_t kgid){ struct kernfs_node *grp_kn; int error; struct iattr newattrs = { .ia_valid = ATTR_UID | ATTR_GID, .ia_uid = kuid, .ia_gid = kgid, };
if (!kobj->state_in_sysfs) return -EINVAL;
if (grp->name) { grp_kn = kernfs_find_and_get(kobj->sd, grp->name); } else { kernfs_get(kobj->sd); grp_kn = kobj->sd; } if (!grp_kn) return -ENOENT;
error = kernfs_setattr(grp_kn, &newattrs); if (!error) error = sysfs_group_attrs_change_owner(kobj, grp_kn, grp, &newattrs);
kernfs_put(grp_kn);
return error;}EXPORT_SYMBOL_GPL(sysfs_group_change_owner);
/** * sysfs_groups_change_owner - change owner of a set of attribute groups. * @kobj: The kobject containing the groups. * @groups: The attribute groups. * @kuid: new owner's kuid * @kgid: new owner's kgid * * Returns 0 on success or error code on failure. */int sysfs_groups_change_owner(struct kobject *kobj, const struct attribute_group *const *groups, kuid_t kuid, kgid_t kgid){ int error = 0, i;
if (!kobj->state_in_sysfs) return -EINVAL;
if (!groups) return 0;
for (i = 0; groups[i]; i++) { error = sysfs_group_change_owner(kobj, groups[i], kuid, kgid); if (error) break; }
return error;}EXPORT_SYMBOL_GPL(sysfs_groups_change_owner);