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fs: add new vfs_poll and file_can_poll helpers

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These abstract out calls to the poll method in preparation for changes
in how we poll.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-03-05 07:26:05 -08:00
parent 6e8b704df5
commit 9965ed174e
9 changed files with 32 additions and 38 deletions
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12
include/linux/poll.h
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@ -74,6 +74,18 @@ static inline void init_poll_funcptr(poll_table *pt, poll_queue_proc qproc)
pt->_key = ~(__poll_t)0; /* all events enabled */
}
static inline bool file_can_poll(struct file *file)
{
return file->f_op->poll;
}
static inline __poll_t vfs_poll(struct file *file, struct poll_table_struct *pt)
{
if (unlikely(!file->f_op->poll))
return DEFAULT_POLLMASK;
return file->f_op->poll(file, pt);
}
struct poll_table_entry {
struct file *filp;
__poll_t key;