ocfs2: Add dir_resv_level mount option

The default behavior for directory reservations stays the same, but we add a
mount option so people can tweak the size of directory reservations
according to their workloads.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/fs/ocfs2/reservations.c b/fs/ocfs2/reservations.c
index 87fa35791f18..6497bcc00fa5 100644
--- a/fs/ocfs2/reservations.c
+++ b/fs/ocfs2/reservations.c
@@ -44,7 +44,11 @@ DEFINE_SPINLOCK(resv_lock);
 
 #define OCFS2_MIN_RESV_WINDOW_BITS      8
 #define OCFS2_MAX_RESV_WINDOW_BITS      1024
-#define OCFS2_RESV_DIR_WINDOW_BITS      OCFS2_MIN_RESV_WINDOW_BITS
+
+int ocfs2_dir_resv_allowed(struct ocfs2_super *osb)
+{
+        return (osb->osb_resv_level && osb->osb_dir_resv_level);
+}
 
 static unsigned int ocfs2_resv_window_bits(struct ocfs2_reservation_map *resmap,
                                            struct ocfs2_alloc_reservation *resv)
@@ -56,8 +60,7 @@ static unsigned int ocfs2_resv_window_bits(struct ocfs2_reservation_map *resmap,
                 /* 8, 16, 32, 64, 128, 256, 512, 1024 */
                 bits = 4 << osb->osb_resv_level;
         } else {
-                /* For now, treat directories the same as files. */
-                bits = 4 << osb->osb_resv_level;
+                bits = 4 << osb->osb_dir_resv_level;
         }
         return bits;
 }