exofs: add bdi backing to mount session

This ensures that dirty data gets flushed properly.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 8442e353309f..54373278a353 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -35,6 +35,7 @@
 
 #include <linux/fs.h>
 #include <linux/time.h>
+#include <linux/backing-dev.h>
 #include "common.h"
 
 /* FIXME: Remove once pnfs hits mainline
@@ -92,6 +93,7 @@ struct exofs_sb_info {
         struct exofs_layout     layout;         /* Default files layout,
                                                  * contains the variable osd_dev
                                                  * array. Keep last */
+        struct backing_dev_info bdi;
         struct osd_dev  *_min_one_dev[1];       /* Place holder for one dev   */
 };
 
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 18e57ea1e5b4..03149b9a5178 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -302,6 +302,7 @@ static void exofs_put_super(struct super_block *sb)
         _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0],
                             sbi->layout.s_pid);
 
+        bdi_destroy(&sbi->bdi);
         exofs_free_sbi(sbi);
         sb->s_fs_info = NULL;
 }
@@ -546,6 +547,10 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         if (!sbi)
                 return -ENOMEM;
 
+        ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
+        if (ret)
+                goto free_bdi;
+
         /* use mount options to fill superblock */
         od = osduld_path_lookup(opts->dev_name);
         if (IS_ERR(od)) {
@@ -612,6 +617,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         }
 
         /* set up operation vectors */
+        sb->s_bdi = &sbi->bdi;
         sb->s_fs_info = sbi;
         sb->s_op = &exofs_sops;
         sb->s_export_op = &exofs_export_ops;
@@ -643,6 +649,8 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         return 0;
 
 free_sbi:
+        bdi_destroy(&sbi->bdi);
+free_bdi:
         EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
                   opts->dev_name, sbi->layout.s_pid, ret);
         exofs_free_sbi(sbi);