Btrfs: allow shrink_delalloc flush the needed reclaimed pages
Currently we only allow a maximum of 2 megabytes of pages to be flushed at a
time. This was ok before, but now we have overcommit which will screw us in a
heartbeat if we are quickly filling the disk. So instead pick either 2
megabytes or the number of pages we need to reclaim to be safe again, which ever
is larger. Thanks,
Signed-off-by: Josef Bacik <josef@redhat.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 96cbc51..424ae82 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3343,7 +3343,7 @@
u64 max_reclaim;
u64 reclaimed = 0;
long time_left;
- int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT;
+ unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT;
int loops = 0;
unsigned long progress;
@@ -3366,7 +3366,8 @@
}
max_reclaim = min(reserved, to_reclaim);
-
+ nr_pages = max_t(unsigned long, nr_pages,
+ max_reclaim >> PAGE_CACHE_SHIFT);
while (loops < 1024) {
/* have the flusher threads jump in and do some IO */
smp_mb();