GFS2: Fix address space from page function

Now that rgrps use the address space which is part of the super
block, we need to update gfs2_mapping2sbd() to take account of
that. The only way to do that easily is to use a different set
of address_space_operations for rgrps.

Reported-by: Abhi Das <adas@redhat.com>
Tested-by: Abhi Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

3 files changed, 9 insertions, 1 deletions

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 005e4686af0d..2cf09b63a6b4 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -97,6 +97,11 @@ const struct address_space_operations gfs2_meta_aops = {
         .releasepage = gfs2_releasepage,
 };
 
+const struct address_space_operations gfs2_rgrp_aops = {
+        .writepage = gfs2_aspace_writepage,
+        .releasepage = gfs2_releasepage,
+};
+
 /**
  * gfs2_getbuf - Get a buffer with a given address space
  * @gl: the glock
diff --git a/fs/gfs2/meta_io.h b/fs/gfs2/meta_io.h
index 4823b934208a..ac5d8027d335 100644
--- a/fs/gfs2/meta_io.h
+++ b/fs/gfs2/meta_io.h
@@ -38,12 +38,15 @@ static inline void gfs2_buffer_copy_tail(struct buffer_head *to_bh,
 }
 
 extern const struct address_space_operations gfs2_meta_aops;
+extern const struct address_space_operations gfs2_rgrp_aops;
 
 static inline struct gfs2_sbd *gfs2_mapping2sbd(struct address_space *mapping)
 {
         struct inode *inode = mapping->host;
         if (mapping->a_ops == &gfs2_meta_aops)
                 return (((struct gfs2_glock *)mapping) - 1)->gl_sbd;
+        else if (mapping->a_ops == &gfs2_rgrp_aops)
+                return container_of(mapping, struct gfs2_sbd, sd_aspace);
         else
                 return inode->i_sb->s_fs_info;
 }
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index fba74a26a6a3..22f954051bb8 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -106,7 +106,7 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
         mapping = &sdp->sd_aspace;
 
         address_space_init_once(mapping);
-        mapping->a_ops = &gfs2_meta_aops;
+        mapping->a_ops = &gfs2_rgrp_aops;
         mapping->host = sb->s_bdev->bd_inode;
         mapping->flags = 0;
         mapping_set_gfp_mask(mapping, GFP_NOFS);