ext4: don't bump up LONG_MAX nr_to_write by a factor of 8

I'm uneasy with lots of stuff going on in ext4_da_writepages(),
but bumping nr_to_write from LLONG_MAX to -8 clearly isn't
making anything better, so avoid the multiplier in that case.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d88ba4a9effad7101a56978118441522b392223d..50f3bba68a2549e06b35f47bf81718dec01f1a4d 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3004,9 +3004,12 @@ static int ext4_da_writepages(struct address_space *mapping,
         * sbi->max_writeback_mb_bump whichever is smaller.
         */
        max_pages = sbi->s_max_writeback_mb_bump << (20 - PAGE_CACHE_SHIFT);
-       if (!range_cyclic && range_whole)
-               desired_nr_to_write = wbc->nr_to_write * 8;
-       else
+       if (!range_cyclic && range_whole) {
+               if (wbc->nr_to_write == LONG_MAX)
+                       desired_nr_to_write = wbc->nr_to_write;
+               else
+                       desired_nr_to_write = wbc->nr_to_write * 8;
+       } else
                desired_nr_to_write = ext4_num_dirty_pages(inode, index,
                                                           max_pages);
        if (desired_nr_to_write > max_pages)