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    Subject[PATCH 03/41] sysfs, kernfs: add skeletons for kernfs
    Date
    Core sysfs implementation will be separated into kernfs so that it can
    be used by other non-kobject users.

    This patch creates fs/kernfs/ directory and makes boilerplate changes.
    kernfs interface will be directly based on sysfs_dirent and its
    forward declaration is moved to include/linux/kernfs.h which is
    included from include/linux/sysfs.h. sysfs core implementation will
    be gradually separated out and moved to kernfs.

    This patch doesn't introduce any functional changes.

    v2: mount.c added.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    ---
    fs/Makefile | 2 +-
    fs/kernfs/Makefile | 5 +++++
    fs/kernfs/dir.c | 9 +++++++++
    fs/kernfs/file.c | 9 +++++++++
    fs/kernfs/inode.c | 9 +++++++++
    fs/kernfs/mount.c | 9 +++++++++
    fs/kernfs/symlink.c | 9 +++++++++
    include/linux/kernfs.h | 12 ++++++++++++
    include/linux/sysfs.h | 3 +--
    9 files changed, 64 insertions(+), 3 deletions(-)
    create mode 100644 fs/kernfs/Makefile
    create mode 100644 fs/kernfs/dir.c
    create mode 100644 fs/kernfs/file.c
    create mode 100644 fs/kernfs/inode.c
    create mode 100644 fs/kernfs/mount.c
    create mode 100644 fs/kernfs/symlink.c
    create mode 100644 include/linux/kernfs.h

    diff --git a/fs/Makefile b/fs/Makefile
    index 4fe6df3..39a824f 100644
    --- a/fs/Makefile
    +++ b/fs/Makefile
    @@ -53,7 +53,7 @@ obj-$(CONFIG_FHANDLE) += fhandle.o
    obj-y += quota/

    obj-$(CONFIG_PROC_FS) += proc/
    -obj-$(CONFIG_SYSFS) += sysfs/
    +obj-$(CONFIG_SYSFS) += sysfs/ kernfs/
    obj-$(CONFIG_CONFIGFS_FS) += configfs/
    obj-y += devpts/

    diff --git a/fs/kernfs/Makefile b/fs/kernfs/Makefile
    new file mode 100644
    index 0000000..674337c
    --- /dev/null
    +++ b/fs/kernfs/Makefile
    @@ -0,0 +1,5 @@
    +#
    +# Makefile for the kernfs pseudo filesystem
    +#
    +
    +obj-y := mount.o inode.o dir.o file.o symlink.o
    diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
    new file mode 100644
    index 0000000..1061602
    --- /dev/null
    +++ b/fs/kernfs/dir.c
    @@ -0,0 +1,9 @@
    +/*
    + * fs/kernfs/dir.c - kernfs directory implementation
    + *
    + * Copyright (c) 2001-3 Patrick Mochel
    + * Copyright (c) 2007 SUSE Linux Products GmbH
    + * Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
    + *
    + * This file is released under the GPLv2.
    + */
    diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
    new file mode 100644
    index 0000000..90b1e88
    --- /dev/null
    +++ b/fs/kernfs/file.c
    @@ -0,0 +1,9 @@
    +/*
    + * fs/kernfs/file.c - kernfs file implementation
    + *
    + * Copyright (c) 2001-3 Patrick Mochel
    + * Copyright (c) 2007 SUSE Linux Products GmbH
    + * Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
    + *
    + * This file is released under the GPLv2.
    + */
    diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
    new file mode 100644
    index 0000000..86bfeea
    --- /dev/null
    +++ b/fs/kernfs/inode.c
    @@ -0,0 +1,9 @@
    +/*
    + * fs/kernfs/inode.c - kernfs inode implementation
    + *
    + * Copyright (c) 2001-3 Patrick Mochel
    + * Copyright (c) 2007 SUSE Linux Products GmbH
    + * Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
    + *
    + * This file is released under the GPLv2.
    + */
    diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
    new file mode 100644
    index 0000000..872e262
    --- /dev/null
    +++ b/fs/kernfs/mount.c
    @@ -0,0 +1,9 @@
    +/*
    + * fs/kernfs/mount.c - kernfs mount implementation
    + *
    + * Copyright (c) 2001-3 Patrick Mochel
    + * Copyright (c) 2007 SUSE Linux Products GmbH
    + * Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
    + *
    + * This file is released under the GPLv2.
    + */
    diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
    new file mode 100644
    index 0000000..2578715
    --- /dev/null
    +++ b/fs/kernfs/symlink.c
    @@ -0,0 +1,9 @@
    +/*
    + * fs/kernfs/symlink.c - kernfs symlink implementation
    + *
    + * Copyright (c) 2001-3 Patrick Mochel
    + * Copyright (c) 2007 SUSE Linux Products GmbH
    + * Copyright (c) 2007, 2013 Tejun Heo <tj@kernel.org>
    + *
    + * This file is released under the GPLv2.
    + */
    diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
    new file mode 100644
    index 0000000..254b9e8
    --- /dev/null
    +++ b/include/linux/kernfs.h
    @@ -0,0 +1,12 @@
    +/*
    + * kernfs.h - pseudo filesystem decoupled from vfs locking
    + *
    + * This file is released under the GPLv2.
    + */
    +
    +#ifndef __LINUX_KERNFS_H
    +#define __LINUX_KERNFS_H
    +
    +struct sysfs_dirent;
    +
    +#endif /* __LINUX_KERNFS_H */
    diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
    index 6c85be6..f82ec46 100644
    --- a/include/linux/sysfs.h
    +++ b/include/linux/sysfs.h
    @@ -12,6 +12,7 @@
    #ifndef _SYSFS_H_
    #define _SYSFS_H_

    +#include <linux/kernfs.h>
    #include <linux/compiler.h>
    #include <linux/errno.h>
    #include <linux/list.h>
    @@ -175,8 +176,6 @@ struct sysfs_ops {
    ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t);
    };

    -struct sysfs_dirent;
    -
    #ifdef CONFIG_SYSFS

    int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
    --
    1.8.4.2


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