93b2b8e4aa
Introduce kernfs interface to manipulate a directory which takes and returns sysfs_dirents. create_dir() is renamed to kernfs_create_dir_ns() and its argumantes and return value are updated. create_dir() usages are replaced with kernfs_create_dir_ns() and sysfs_create_subdir() usages are replaced with kernfs_create_dir(). Dup warnings are handled explicitly by sysfs users of the kernfs interface. sysfs_enable_ns() is renamed to kernfs_enable_ns(). This patch doesn't introduce any behavior changes. v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS. v3: kernfs_enable_ns() added. v4: Refreshed on top of "sysfs: drop kobj_ns_type handling, take #2" so that this patch removes sysfs_enable_ns(). Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* kernfs.h - pseudo filesystem decoupled from vfs locking
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*
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* This file is released under the GPLv2.
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*/
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#ifndef __LINUX_KERNFS_H
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#define __LINUX_KERNFS_H
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#include <linux/kernel.h>
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#include <linux/err.h>
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struct file;
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struct iattr;
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struct sysfs_dirent;
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#ifdef CONFIG_SYSFS
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struct sysfs_dirent *kernfs_create_dir_ns(struct sysfs_dirent *parent,
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const char *name, void *priv,
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const void *ns);
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struct sysfs_dirent *kernfs_create_link(struct sysfs_dirent *parent,
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const char *name,
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struct sysfs_dirent *target);
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void kernfs_remove(struct sysfs_dirent *sd);
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int kernfs_remove_by_name_ns(struct sysfs_dirent *parent, const char *name,
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const void *ns);
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int kernfs_rename_ns(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent,
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const char *new_name, const void *new_ns);
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void kernfs_enable_ns(struct sysfs_dirent *sd);
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int kernfs_setattr(struct sysfs_dirent *sd, const struct iattr *iattr);
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#else /* CONFIG_SYSFS */
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static inline struct sysfs_dirent *
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kernfs_create_dir_ns(struct sysfs_dirent *parent, const char *name, void *priv,
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const void *ns)
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{ return ERR_PTR(-ENOSYS); }
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static inline struct sysfs_dirent *
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kernfs_create_link(struct sysfs_dirent *parent, const char *name,
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struct sysfs_dirent *target)
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{ return ERR_PTR(-ENOSYS); }
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static inline void kernfs_remove(struct sysfs_dirent *sd) { }
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static inline int kernfs_remove_by_name_ns(struct sysfs_dirent *parent,
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const char *name, const void *ns)
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{ return -ENOSYS; }
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static inline int kernfs_rename_ns(struct sysfs_dirent *sd,
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struct sysfs_dirent *new_parent,
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const char *new_name, const void *new_ns)
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{ return -ENOSYS; }
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static inline void kernfs_enable_ns(struct sysfs_dirent *sd) { }
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static inline int kernfs_setattr(struct sysfs_dirent *sd,
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const struct iattr *iattr)
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{ return -ENOSYS; }
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#endif /* CONFIG_SYSFS */
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static inline struct sysfs_dirent *
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kernfs_create_dir(struct sysfs_dirent *parent, const char *name, void *priv)
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{
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return kernfs_create_dir_ns(parent, name, priv, NULL);
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}
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static inline int kernfs_remove_by_name(struct sysfs_dirent *parent,
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const char *name)
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{
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return kernfs_remove_by_name_ns(parent, name, NULL);
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}
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#endif /* __LINUX_KERNFS_H */
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