zonefs: Cache zone group directory inodes

Since looking up any zone file inode requires looking up first the inode
for the directory representing the zone group of the file, ensuring that
the zone group inodes are always cached is desired. To do so, take an
extra reference on the zone groups directory inodes on mount, thus
avoiding the eviction of these inodes from the inode cache until the
volume is unmounted.

Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/zonefs/zonefs.h b/fs/zonefs/zonefs.h
index f88466a4158b..8175652241b5 100644
--- a/fs/zonefs/zonefs.h
+++ b/fs/zonefs/zonefs.h
@@ -76,6 +76,7 @@ struct zonefs_zone {
  * as files, one file per zone.
  */
 struct zonefs_zone_group {
+	struct inode		*g_inode;
 	unsigned int		g_nr_zones;
 	struct zonefs_zone	*g_zones;
 };