GFS2: Add a rgrp bitmap full flag
During block allocation, it is useful to know if sections of disk
are full on a finer grained basis than a single resource group.
This can make a performance difference when resource groups have
larger numbers of bitmap blocks, since we no longer have to search
them all block by block in each individual bitmap.
The full flag is set on a per-bitmap basis when it has been
searched and found to have no free space. It is then skipped in
subsequent searches until the flag is reset. The resetting
occurs if we have to drop the glock on the resource group for any
reason, or if we deallocate some blocks within that resource
group and thus free up some space.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index de50d86..dd87379 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -64,9 +64,12 @@
const struct gfs2_log_operations *le_ops;
};
+#define GBF_FULL 1
+
struct gfs2_bitmap {
struct buffer_head *bi_bh;
char *bi_clone;
+ unsigned long bi_flags;
u32 bi_offset;
u32 bi_start;
u32 bi_len;