switch epoll_ctl() to fdget
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 9ad17b15..293f867 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1792,7 +1792,7 @@
{
int error;
int did_lock_epmutex = 0;
- struct file *file, *tfile;
+ struct fd f, tf;
struct eventpoll *ep;
struct epitem *epi;
struct epoll_event epds;
@@ -1802,20 +1802,19 @@
copy_from_user(&epds, event, sizeof(struct epoll_event)))
goto error_return;
- /* Get the "struct file *" for the eventpoll file */
error = -EBADF;
- file = fget(epfd);
- if (!file)
+ f = fdget(epfd);
+ if (!f.file)
goto error_return;
/* Get the "struct file *" for the target file */
- tfile = fget(fd);
- if (!tfile)
+ tf = fdget(fd);
+ if (!tf.file)
goto error_fput;
/* The target file descriptor must support poll */
error = -EPERM;
- if (!tfile->f_op || !tfile->f_op->poll)
+ if (!tf.file->f_op || !tf.file->f_op->poll)
goto error_tgt_fput;
/* Check if EPOLLWAKEUP is allowed */
@@ -1828,14 +1827,14 @@
* adding an epoll file descriptor inside itself.
*/
error = -EINVAL;
- if (file == tfile || !is_file_epoll(file))
+ if (f.file == tf.file || !is_file_epoll(f.file))
goto error_tgt_fput;
/*
* At this point it is safe to assume that the "private_data" contains
* our own data structure.
*/
- ep = file->private_data;
+ ep = f.file->private_data;
/*
* When we insert an epoll file descriptor, inside another epoll file
@@ -1854,14 +1853,14 @@
did_lock_epmutex = 1;
}
if (op == EPOLL_CTL_ADD) {
- if (is_file_epoll(tfile)) {
+ if (is_file_epoll(tf.file)) {
error = -ELOOP;
- if (ep_loop_check(ep, tfile) != 0) {
+ if (ep_loop_check(ep, tf.file) != 0) {
clear_tfile_check_list();
goto error_tgt_fput;
}
} else
- list_add(&tfile->f_tfile_llink, &tfile_check_list);
+ list_add(&tf.file->f_tfile_llink, &tfile_check_list);
}
mutex_lock_nested(&ep->mtx, 0);
@@ -1871,14 +1870,14 @@
* above, we can be sure to be able to use the item looked up by
* ep_find() till we release the mutex.
*/
- epi = ep_find(ep, tfile, fd);
+ epi = ep_find(ep, tf.file, fd);
error = -EINVAL;
switch (op) {
case EPOLL_CTL_ADD:
if (!epi) {
epds.events |= POLLERR | POLLHUP;
- error = ep_insert(ep, &epds, tfile, fd);
+ error = ep_insert(ep, &epds, tf.file, fd);
} else
error = -EEXIST;
clear_tfile_check_list();
@@ -1903,9 +1902,9 @@
if (did_lock_epmutex)
mutex_unlock(&epmutex);
- fput(tfile);
+ fdput(tf);
error_fput:
- fput(file);
+ fdput(f);
error_return:
return error;