[PATCH 12/13] vfs: Convert select to use idr_get_tag_batch()

[Sandhya Bankar]

Convert select to use idr_get_tag_batch().

Signed-off-by: Sandhya Bankar <bankarsandhya...@gmail.com>
Signed-off-by: Matthew Wilcox <mawil...@microsoft.com>
---
 fs/select.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/fs/select.c b/fs/select.c
index e211227..5d20a14 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -346,32 +346,33 @@ static int poll_select_copy_remaining(struct timespec64 
*end_time,
 
 static int max_select_fd(unsigned long n, fd_set_bits *fds)
 {
-       unsigned long *open_fds;
+       unsigned long bad_fds;
        unsigned long set;
        int max;
-       struct fdtable *fdt;
+       struct idr *fd_idr = &current->files->fd_idr;
 
        /* handle last in-complete long-word first */
        set = ~(~0UL << (n & (BITS_PER_LONG-1)));
        n /= BITS_PER_LONG;
-       fdt = files_fdtable(current->files);
-       open_fds = fdt->open_fds + n;
        max = 0;
        if (set) {
                set &= BITS(fds, n);
                if (set) {
-                       if (!(set & ~*open_fds))
+                       bad_fds = idr_get_tag_batch(fd_idr, (n * BITS_PER_LONG),
+                                                       IDR_FREE);
+                       if (!(set & bad_fds))
                                goto get_max;
                        return -EBADF;
                }
        }
        while (n) {
-               open_fds--;
                n--;
                set = BITS(fds, n);
                if (!set)
                        continue;
-               if (set & ~*open_fds)
+               bad_fds = idr_get_tag_batch(fd_idr, (n * BITS_PER_LONG),
+                                               IDR_FREE);
+               if (set & bad_fds)
                        return -EBADF;
                if (max)
                        continue;
-- 
1.8.3.1