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ep_loop_check_proc(): saner calling conventions 

1) 'cookie' argument is unused; kill it.
2) 'priv' one is always an epoll struct file, and we only care
about its associated struct eventpoll; pass that instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-09-26 16:50:57 -04:00
parent 6a3890c474
commit bde03c4c1a
1 changed files with 16 additions and 22 deletions
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38
fs/eventpoll.c
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@ -1845,19 +1845,14 @@ send_events:
* result in excessive stack usage). * result in excessive stack usage).
* *
* @priv: Pointer to the epoll file to be currently checked. * @priv: Pointer to the epoll file to be currently checked.
* @cookie: Original cookie for this call. This is the top-of-the-chain epoll * @depth: Current depth of the path being checked.
* data structure pointer.
* @call_nests: Current dept of the @ep_call_nested() call stack.
* *
* Returns: Returns zero if adding the epoll @file inside current epoll * Returns: Returns zero if adding the epoll @file inside current epoll
* structure @ep does not violate the constraints, or -1 otherwise. * structure @ep does not violate the constraints, or -1 otherwise.
*/ */
static int ep_loop_check_proc(void *priv, void *cookie, int depth) static int ep_loop_check_proc(struct eventpoll *ep, int depth)
{ {
int error = 0; int error = 0;
struct file *file = priv;
struct eventpoll *ep = file->private_data;
struct eventpoll *ep_tovisit;
struct rb_node *rbp; struct rb_node *rbp;
struct epitem *epi; struct epitem *epi;
@ -1866,15 +1861,14 @@ static int ep_loop_check_proc(void *priv, void *cookie, int depth)
for (rbp = rb_first_cached(&ep->rbr); rbp; rbp = rb_next(rbp)) { for (rbp = rb_first_cached(&ep->rbr); rbp; rbp = rb_next(rbp)) {
epi = rb_entry(rbp, struct epitem, rbn); epi = rb_entry(rbp, struct epitem, rbn);
if (unlikely(is_file_epoll(epi->ffd.file))) { if (unlikely(is_file_epoll(epi->ffd.file))) {
struct eventpoll *ep_tovisit;
ep_tovisit = epi->ffd.file->private_data; ep_tovisit = epi->ffd.file->private_data;
if (ep_tovisit->gen == loop_check_gen) if (ep_tovisit->gen == loop_check_gen)
continue; continue;
if (ep_tovisit == inserting_into || depth > EP_MAX_NESTS) { if (ep_tovisit == inserting_into || depth > EP_MAX_NESTS)
error = -1; error = -1;
} else { else
error = ep_loop_check_proc(epi->ffd.file, ep_tovisit, error = ep_loop_check_proc(ep_tovisit, depth + 1);
depth + 1);
}
if (error != 0) if (error != 0)
break; break;
} else { } else {
@ -1899,20 +1893,20 @@ static int ep_loop_check_proc(void *priv, void *cookie, int depth)
} }
/** /**
* ep_loop_check - Performs a check to verify that adding an epoll file (@file) * ep_loop_check - Performs a check to verify that adding an epoll file (@to)
* another epoll file (represented by @ep) does not create * into another epoll file (represented by @from) does not create
* closed loops or too deep chains. * closed loops or too deep chains.
* *
* @ep: Pointer to the epoll private data structure. * @from: Pointer to the epoll we are inserting into.
* @file: Pointer to the epoll file to be checked. * @to: Pointer to the epoll to be inserted.
* *
* Returns: Returns zero if adding the epoll @file inside current epoll * Returns: Returns zero if adding the epoll @to inside the epoll @from
* structure @ep does not violate the constraints, or -1 otherwise. * does not violate the constraints, or -1 otherwise.
*/ */
static int ep_loop_check(struct eventpoll *ep, struct file *file) static int ep_loop_check(struct eventpoll *ep, struct eventpoll *to)
{ {
inserting_into = ep; inserting_into = ep;
return ep_loop_check_proc(file, ep, 0); return ep_loop_check_proc(to, 0);
} }
static void clear_tfile_check_list(void) static void clear_tfile_check_list(void)
@ -2086,8 +2080,9 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
loop_check_gen++; loop_check_gen++;
full_check = 1; full_check = 1;
if (is_file_epoll(tf.file)) { if (is_file_epoll(tf.file)) {
tep = tf.file->private_data;
error = -ELOOP; error = -ELOOP;
if (ep_loop_check(ep, tf.file) != 0) if (ep_loop_check(ep, tep) != 0)
goto error_tgt_fput; goto error_tgt_fput;
} else { } else {
get_file(tf.file); get_file(tf.file);
@ -2098,7 +2093,6 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
if (error) if (error)
goto error_tgt_fput; goto error_tgt_fput;
if (is_file_epoll(tf.file)) { if (is_file_epoll(tf.file)) {
tep = tf.file->private_data;
error = epoll_mutex_lock(&tep->mtx, 1, nonblock); error = epoll_mutex_lock(&tep->mtx, 1, nonblock);
if (error) { if (error) {
mutex_unlock(&ep->mtx); mutex_unlock(&ep->mtx);