df394fb56c
kernfs is being updated to allow multiple sysfs_dirent hierarchies so that it can also be used by other users. Currently, sysfs super_blocks are always attached to one kernfs_root - sysfs_root - and distinguished only by their namespace tags. This patch adds sysfs_super_info->root and update sysfs_fill/test_super() so that super_blocks are identified by the combination of both the associated kernfs_root and namespace tag. This allows mounting different kernfs hierarchies. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
/*
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* fs/sysfs/sysfs.h - sysfs internal header file
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*
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* Copyright (c) 2001-3 Patrick Mochel
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* Copyright (c) 2007 SUSE Linux Products GmbH
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
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*
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* This file is released under the GPLv2.
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*/
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#ifndef __SYSFS_INTERNAL_H
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#define __SYSFS_INTERNAL_H
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#include "../kernfs/kernfs-internal.h"
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#include <linux/sysfs.h>
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/*
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* mount.c
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*/
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struct sysfs_super_info {
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/*
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* The root associated with this super_block. Each super_block is
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* identified by the root and ns it's associated with.
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*/
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struct kernfs_root *root;
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/*
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* Each sb is associated with one namespace tag, currently the network
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* namespace of the task which mounted this sysfs instance. If multiple
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* tags become necessary, make the following an array and compare
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* sysfs_dirent tag against every entry.
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*/
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const void *ns;
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};
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#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
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extern struct sysfs_dirent *sysfs_root_sd;
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extern struct kmem_cache *sysfs_dir_cachep;
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/*
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* dir.c
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*/
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extern spinlock_t sysfs_symlink_target_lock;
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void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name);
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/*
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* file.c
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*/
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int sysfs_add_file(struct sysfs_dirent *dir_sd,
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const struct attribute *attr, bool is_bin);
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int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
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const struct attribute *attr, bool is_bin,
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umode_t amode, const void *ns);
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/*
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* symlink.c
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*/
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int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,
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const char *name);
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#endif /* __SYSFS_INTERNAL_H */
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