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convert do_select()

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take the logics from fdget() to fdput() into an inlined helper - with existing
wait_key_set() subsumed into that.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-07-23 01:55:19 -04:00
parent 6b1a5ae9b5
commit d000e073ca
1 changed files with 10 additions and 11 deletions
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21
fs/select.c
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@ -462,15 +462,22 @@ get_max:
EPOLLNVAL)
#define POLLEX_SET (EPOLLPRI | EPOLLNVAL)
static inline void wait_key_set(poll_table *wait, unsigned long in,
static inline __poll_t select_poll_one(int fd, poll_table *wait, unsigned long in,
unsigned long out, unsigned long bit,
__poll_t ll_flag)
{
CLASS(fd, f)(fd);
if (fd_empty(f))
return EPOLLNVAL;
wait->_key = POLLEX_SET | ll_flag;
if (in & bit)
wait->_key |= POLLIN_SET;
if (out & bit)
wait->_key |= POLLOUT_SET;
return vfs_poll(fd_file(f), wait);
}
static noinline_for_stack int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time)
@ -522,20 +529,12 @@ static noinline_for_stack int do_select(int n, fd_set_bits *fds, struct timespec
}
for (j = 0; j < BITS_PER_LONG; ++j, ++i, bit <<= 1) {
struct fd f;
if (i >= n)
break;
if (!(bit & all_bits))
continue;
mask = EPOLLNVAL;
f = fdget(i);
if (fd_file(f)) {
wait_key_set(wait, in, out, bit,
busy_flag);
mask = vfs_poll(fd_file(f), wait);
fdput(f);
}
mask = select_poll_one(i, wait, in, out, bit,
busy_flag);
if ((mask & POLLIN_SET) && (in & bit)) {
res_in |= bit;
retval++;