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authorJens Axboe <axboe@kernel.dk>2020-01-08 14:35:13 -0700
committerJens Axboe <axboe@kernel.dk>2020-01-29 15:45:42 -0700
commit58e41a44c488f3e9601fd8150f58377ef8f44889 (patch)
treec7e51e9711ffb567dffbdbc650607a85d3eda0a3
parentf86cd20c9454847a524ddbdcdec32c0380ed7c9b (diff)
eventpoll: abstract out epoll_ctl() handler
No functional changes in this patch. Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--fs/eventpoll.c45
1 files changed, 25 insertions, 20 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 67a395039268..cd848e8d08e2 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2074,27 +2074,15 @@ SYSCALL_DEFINE1(epoll_create, int, size)
return do_epoll_create(0);
}
-/*
- * The following function implements the controller interface for
- * the eventpoll file that enables the insertion/removal/change of
- * file descriptors inside the interest set.
- */
-SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
- struct epoll_event __user *, event)
+static int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds)
{
int error;
int full_check = 0;
struct fd f, tf;
struct eventpoll *ep;
struct epitem *epi;
- struct epoll_event epds;
struct eventpoll *tep = NULL;
- error = -EFAULT;
- if (ep_op_has_event(op) &&
- copy_from_user(&epds, event, sizeof(struct epoll_event)))
- goto error_return;
-
error = -EBADF;
f = fdget(epfd);
if (!f.file)
@@ -2112,7 +2100,7 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
/* Check if EPOLLWAKEUP is allowed */
if (ep_op_has_event(op))
- ep_take_care_of_epollwakeup(&epds);
+ ep_take_care_of_epollwakeup(epds);
/*
* We have to check that the file structure underneath the file descriptor
@@ -2128,11 +2116,11 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
* so EPOLLEXCLUSIVE is not allowed for a EPOLL_CTL_MOD operation.
* Also, we do not currently supported nested exclusive wakeups.
*/
- if (ep_op_has_event(op) && (epds.events & EPOLLEXCLUSIVE)) {
+ if (ep_op_has_event(op) && (epds->events & EPOLLEXCLUSIVE)) {
if (op == EPOLL_CTL_MOD)
goto error_tgt_fput;
if (op == EPOLL_CTL_ADD && (is_file_epoll(tf.file) ||
- (epds.events & ~EPOLLEXCLUSIVE_OK_BITS)))
+ (epds->events & ~EPOLLEXCLUSIVE_OK_BITS)))
goto error_tgt_fput;
}
@@ -2192,8 +2180,8 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
switch (op) {
case EPOLL_CTL_ADD:
if (!epi) {
- epds.events |= EPOLLERR | EPOLLHUP;
- error = ep_insert(ep, &epds, tf.file, fd, full_check);
+ epds->events |= EPOLLERR | EPOLLHUP;
+ error = ep_insert(ep, epds, tf.file, fd, full_check);
} else
error = -EEXIST;
if (full_check)
@@ -2208,8 +2196,8 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
case EPOLL_CTL_MOD:
if (epi) {
if (!(epi->event.events & EPOLLEXCLUSIVE)) {
- epds.events |= EPOLLERR | EPOLLHUP;
- error = ep_modify(ep, epi, &epds);
+ epds->events |= EPOLLERR | EPOLLHUP;
+ error = ep_modify(ep, epi, epds);
}
} else
error = -ENOENT;
@@ -2232,6 +2220,23 @@ error_return:
}
/*
+ * The following function implements the controller interface for
+ * the eventpoll file that enables the insertion/removal/change of
+ * file descriptors inside the interest set.
+ */
+SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
+ struct epoll_event __user *, event)
+{
+ struct epoll_event epds;
+
+ if (ep_op_has_event(op) &&
+ copy_from_user(&epds, event, sizeof(struct epoll_event)))
+ return -EFAULT;
+
+ return do_epoll_ctl(epfd, op, fd, &epds);
+}
+
+/*
* Implement the event wait interface for the eventpoll file. It is the kernel
* part of the user space epoll_wait(2).
*/