docs/sysfs: Update directory/kobject documentation.
Some time ago the way how sysfs stores a pointer to a kobject corresponding to a directory was modified. This patch brings the documentation again in sync with the implementation. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Cc: Tejun Heo <tj@kernel.org> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -39,10 +39,12 @@ userspace. Top-level directories in sysfs represent the common
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ancestors of object hierarchies; i.e. the subsystems the objects
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belong to.
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Sysfs internally stores the kobject that owns the directory in the
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->d_fsdata pointer of the directory's dentry. This allows sysfs to do
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reference counting directly on the kobject when the file is opened and
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closed.
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Sysfs internally stores a pointer to the kobject that implements a
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directory in the sysfs_dirent object associated with the directory. In
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the past this kobject pointer has been used by sysfs to do reference
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counting directly on the kobject whenever the file is opened or closed.
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With the current sysfs implementation the kobject reference count is
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only modified directly by the function sysfs_schedule_callback().
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Attributes
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