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authorSteven Whitehouse <swhiteho@redhat.com>2017-12-22 13:13:07 +0100
committerBob Peterson <rpeterso@redhat.com>2018-01-17 06:34:24 -0700
commit90bcab998dcadc8a1515994b558da10631298bf3 (patch)
treeaac4aa81ba971325babc502841831671811030e7 /fs/gfs2/rgrp.c
parent1291a0d5049dbc06baaaf66a9ff3f53db493b19b (diff)
downloadlinux-90bcab998dcadc8a1515994b558da10631298bf3.tar.bz2
gfs2: Add gfs2_blk2rgrpd comment and fix incorrect use
Document when to use gfs2_blk2rgrpd for "inexact" resource group matching. Based on that, fix an incorrect use of gfs2_blk2rgrpd in sweep_bh_for_rgrps. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/rgrp.c')
-rw-r--r--fs/gfs2/rgrp.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 95b2a57ded33..211d7a5fa10f 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -489,6 +489,13 @@ void gfs2_rgrp_verify(struct gfs2_rgrpd *rgd)
* @blk: The data block number
* @exact: True if this needs to be an exact match
*
+ * The @exact argument should be set to true by most callers. The exception
+ * is when we need to match blocks which are not represented by the rgrp
+ * bitmap, but which are part of the rgrp (i.e. padding blocks) which are
+ * there for alignment purposes. Another way of looking at it is that @exact
+ * matches only valid data/metadata blocks, but with @exact false, it will
+ * match any block within the extent of the rgrp.
+ *
* Returns: The resource group, or NULL if not found
*/