GFS2: If we use up our block reservation, request more next time (1a855033) · Commits · 戴 / test

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. Signed-off-by:

Bob Peterson <rpeterso@redhat.com> Signed-off-by:

Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/rgrp.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

fs/gfs2/rgrp.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;

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