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authorJani Nikula <jani.nikula@intel.com>2020-12-15 20:45:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 22:46:18 -0800
commit371e03880d9d34534d3eafd2a7581042be598e39 (patch)
tree3f65ecc330a5b657ccf18fa540d5c79866f8c492 /kernel/relay.c
parent6f8f25440d791855e8b6a26cd2bff9d738468416 (diff)
relay: make create_buf_file and remove_buf_file callbacks mandatory
All clients provide create_buf_file and remove_buf_file callbacks, and they're required for relay to make sense. There is no point in them being optional. Also document whether each callback is mandatory/optional. Link: https://lkml.kernel.org/r/88003c1527386b93036e286e7917f1e33aec84ac.1606153547.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com> Suggested-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kalle Valo <kvalo@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/relay.c')
-rw-r--r--kernel/relay.c26
1 files changed, 1 insertions, 25 deletions
diff --git a/kernel/relay.c b/kernel/relay.c
index d9b8185161a8..dd4ec4ec07f3 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -271,26 +271,6 @@ static int subbuf_start_default_callback (struct rchan_buf *buf,
return 1;
}
-/*
- * create_buf_file_create() default callback. Does nothing.
- */
-static struct dentry *create_buf_file_default_callback(const char *filename,
- struct dentry *parent,
- umode_t mode,
- struct rchan_buf *buf,
- int *is_global)
-{
- return NULL;
-}
-
-/*
- * remove_buf_file() default callback. Does nothing.
- */
-static int remove_buf_file_default_callback(struct dentry *dentry)
-{
- return -EINVAL;
-}
-
/**
* wakeup_readers - wake up readers waiting on a channel
* @work: contains the channel buffer
@@ -467,10 +447,6 @@ static void setup_callbacks(struct rchan *chan,
{
if (!cb->subbuf_start)
cb->subbuf_start = subbuf_start_default_callback;
- if (!cb->create_buf_file)
- cb->create_buf_file = create_buf_file_default_callback;
- if (!cb->remove_buf_file)
- cb->remove_buf_file = remove_buf_file_default_callback;
chan->cb = cb;
}
@@ -530,7 +506,7 @@ struct rchan *relay_open(const char *base_filename,
return NULL;
if (subbuf_size > UINT_MAX / n_subbufs)
return NULL;
- if (!cb)
+ if (!cb || !cb->create_buf_file || !cb->remove_buf_file)
return NULL;
chan = kzalloc(sizeof(struct rchan), GFP_KERNEL);