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kernfs: add kernfs_ops->open/release() callbacks

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Add ->open/release() methods to kernfs_ops.  ->open() is called when
the file is opened and ->release() when the file is either released or
severed.  These callbacks can be used, for example, to manage
persistent caching objects over multiple seq_file iterations.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Acked-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2016-12-27 14:49:03 -05:00
parent a1d82aff5d
commit 0e67db2f9f
4 changed files with 57 additions and 8 deletions
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2
fs/kernfs/kernfs-internal.h
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@ -104,7 +104,7 @@ struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
*/
extern const struct file_operations kernfs_file_fops;
void kernfs_unmap_bin_file(struct kernfs_node *kn);
void kernfs_drain_open_files(struct kernfs_node *kn);
/*
* symlink.c