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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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18
net/9p/trans_fd.c
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@@ -231,7 +231,7 @@ static void p9_conn_cancel(struct p9_conn *m, int err)
static __poll_t
p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err)
{
__poll_t ret, n;
__poll_t ret;
struct p9_trans_fd *ts = NULL;
if (client && client->status == Connected)
@@ -243,19 +243,9 @@ p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err)
return EPOLLERR;
}
if (!ts->rd->f_op->poll)
ret = DEFAULT_POLLMASK;
else
ret = ts->rd->f_op->poll(ts->rd, pt);
if (ts->rd != ts->wr) {
if (!ts->wr->f_op->poll)
n = DEFAULT_POLLMASK;
else
n = ts->wr->f_op->poll(ts->wr, pt);
ret = (ret & ~EPOLLOUT) | (n & ~EPOLLIN);
}
ret = vfs_poll(ts->rd, pt);
if (ts->rd != ts->wr)
ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN);
return ret;
}