diff options
| author | Tejun Heo <tj@kernel.org> | 2013-11-28 23:54:26 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-30 05:48:14 +0400 |
| commit | d19b9846df64d8845be682b6318bd1aee246cf60 (patch) | |
| tree | 688842d196ae287bce080fe2e13ca00e796c8a06 /include/linux/kernfs.h | |
| parent | 2d0cfbec2a95c16818960fda1dfa815fd1a62070 (diff) | |
| download | linux-d19b9846df64d8845be682b6318bd1aee246cf60.tar.xz | |
sysfs, kernfs: add kernfs_ops->seq_{start|next|stop}()
kernfs_ops currently only supports single_open() behavior which is
pretty restrictive. Add optional callbacks ->seq_{start|next|stop}()
which, when implemented, are invoked for seq_file traversal. This
allows full seq_file functionality for kernfs users. This currently
doesn't have any user and doesn't change any behavior.
v2: Refreshed on top of the updated "sysfs, kernfs: prepare read path
for kernfs".
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/kernfs.h')
| -rw-r--r-- | include/linux/kernfs.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h index d0912cf02087..ba993ebcd81e 100644 --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -37,8 +37,9 @@ struct kernfs_ops { /* * Read is handled by either seq_file or raw_read(). * - * If seq_show() is present, seq_file path is active. The behavior - * is equivalent to single_open(). @sf->private points to the + * If seq_show() is present, seq_file path is active. Other seq + * operations are optional and if not implemented, the behavior is + * equivalent to single_open(). @sf->private points to the * associated sysfs_open_file. * * read() is bounced through kernel buffer and a read larger than @@ -46,6 +47,10 @@ struct kernfs_ops { */ int (*seq_show)(struct seq_file *sf, void *v); + void *(*seq_start)(struct seq_file *sf, loff_t *ppos); + void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos); + void (*seq_stop)(struct seq_file *sf, void *v); + ssize_t (*read)(struct sysfs_open_file *of, char *buf, size_t bytes, loff_t off); |