If we run out of blocks for a given multi-block allocation, we obviously did not reserve enough. We should reserve more blocks for the next reservation to reduce fragmentation. This patch increases the size hint for reservations when they run out. --- fs/gfs2/rgrp.c | 3 +++ fs/gfs2/rgrp.h | 1 + 2 files changed, 4 insertions(+)
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index f65e56b..d4b9d93 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -2251,6 +2251,9 @@ static void gfs2_adjust_reservation(struct gfs2_inode *ip, trace_gfs2_rs(rs, TRACE_RS_CLAIM); if (rs->rs_free && !ret) goto out; + /* We used up our block reservation, so we should + reserve more blocks next time. */ + atomic_add(RGRP_RSRV_ADDBLKS, &rs->rs_sizehint); } __rs_deltree(rs); } diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h index 5d8f085..b104f4a 100644 --- a/fs/gfs2/rgrp.h +++ b/fs/gfs2/rgrp.h @@ -20,6 +20,7 @@ */ #define RGRP_RSRV_MINBYTES 8 #define RGRP_RSRV_MINBLKS ((u32)(RGRP_RSRV_MINBYTES * GFS2_NBBY)) +#define RGRP_RSRV_ADDBLKS 64 struct gfs2_rgrpd; struct gfs2_sbd; -- 1.9.3