exofs: add bdi backing to mount session

This ensures that dirty data gets flushed properly.

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

diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 8442e35..5437327 100644 (file)
--- 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 18e57ea..03149b9 100644 (file)
--- 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);