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docs/sysfs: Update directory/kobject documentation.

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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>
This commit is contained in:
Bart Van Assche 2010-12-21 13:09:23 +01:00 • committed by Greg Kroah-Hartman
parent a5462516aa
commit 5480bcdd60
1 changed files with 6 additions and 4 deletions
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10
Documentation/filesystems/sysfs.txt
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@ -39,10 +39,12 @@ userspace. Top-level directories in sysfs represent the common
ancestors of object hierarchies; i.e. the subsystems the objects ancestors of object hierarchies; i.e. the subsystems the objects
belong to. belong to.
Sysfs internally stores the kobject that owns the directory in the Sysfs internally stores a pointer to the kobject that implements a
->d_fsdata pointer of the directory's dentry. This allows sysfs to do directory in the sysfs_dirent object associated with the directory. In
reference counting directly on the kobject when the file is opened and the past this kobject pointer has been used by sysfs to do reference
closed. counting directly on the kobject whenever the file is opened or closed.
With the current sysfs implementation the kobject reference count is
only modified directly by the function sysfs_schedule_callback().
Attributes Attributes