From 725d0e9d464d567cd9290e29879d8bffc92013f8 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Tue, 2 Oct 2018 14:59:54 +0100 Subject: gfs2: Add per-reservation reserved block accounting Add a rs_reserved field to struct gfs2_blkreserv to keep track of the number of blocks reserved by this particular reservation, and a rd_reserved field to struct gfs2_rgrpd to keep track of the total number of reserved blocks in the resource group. Those blocks are exclusively reserved, as opposed to the rs_requested / rd_requested blocks which are tracked in the reservation tree (rd_rstree) and which can be stolen if necessary. When making a reservation with gfs2_inplace_reserve, rs_reserved is set to somewhere between ap->min_target and ap->target depending on the number of free blocks in the resource group. When allocating blocks with gfs2_alloc_blocks, rs_reserved is decremented accordingly. Eventually, any reserved but not consumed blocks are returned to the resource group by gfs2_inplace_release. Signed-off-by: Andreas Gruenbacher --- fs/gfs2/incore.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/gfs2/incore.h') diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 0640d0c70a75..2679ba54798c 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -107,6 +107,7 @@ struct gfs2_rgrpd { u32 rd_bitbytes; /* number of bytes in data bitmaps */ u32 rd_free; u32 rd_requested; /* number of blocks in rd_rstree */ + u32 rd_reserved; /* number of reserved blocks */ u32 rd_free_clone; u32 rd_dinodes; u64 rd_igeneration; @@ -292,6 +293,7 @@ struct gfs2_blkreserv { struct gfs2_rgrpd *rs_rgd; u64 rs_start; u32 rs_requested; + u32 rs_reserved; /* number of reserved blocks */ }; /* -- cgit v1.2.3