afs: 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/afs/internal.h b/fs/afs/internal.h
index c54dad4..a10f258 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -19,6 +19,7 @@
 #include <linux/workqueue.h>
 #include <linux/sched.h>
 #include <linux/fscache.h>
+#include <linux/backing-dev.h>
 
 #include "afs.h"
 #include "afs_vl.h"
@@ -313,6 +314,7 @@ struct afs_volume {
        unsigned short          rjservers;      /* number of servers discarded due to -ENOMEDIUM */
        struct afs_server       *servers[8];    /* servers on which volume resides (ordered) */
        struct rw_semaphore     server_sem;     /* lock for accessing current server */
+       struct backing_dev_info bdi;
 };
 
 /*

diff --git a/fs/afs/super.c b/fs/afs/super.c
index 14f6431..e932e5a 100644 (file)
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -311,6 +311,7 @@ static int afs_fill_super(struct super_block *sb, void *data)
        sb->s_magic             = AFS_FS_MAGIC;
        sb->s_op                = &afs_super_ops;
        sb->s_fs_info           = as;
+       sb->s_bdi               = &as->volume->bdi;
 
        /* allocate the root inode and dentry */
        fid.vid         = as->volume->vid;

diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index a353e69..401eeb2 100644 (file)
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -106,6 +106,10 @@ struct afs_volume *afs_volume_lookup(struct afs_mount_params *params)
        volume->cell            = params->cell;
        volume->vid             = vlocation->vldb.vid[params->type];
 
+       ret = bdi_setup_and_register(&volume->bdi, "afs", BDI_CAP_MAP_COPY);
+       if (ret)
+               goto error_bdi;
+
        init_rwsem(&volume->server_sem);
 
        /* look up all the applicable server records */
@@ -151,6 +155,8 @@ error:
        return ERR_PTR(ret);
 
 error_discard:
+       bdi_destroy(&volume->bdi);
+error_bdi:
        up_write(&params->cell->vl_sem);
 
        for (loop = volume->nservers - 1; loop >= 0; loop--)
@@ -200,6 +206,7 @@ void afs_put_volume(struct afs_volume *volume)
        for (loop = volume->nservers - 1; loop >= 0; loop--)
                afs_put_server(volume->servers[loop]);
 
+       bdi_destroy(&volume->bdi);
        kfree(volume);
 
        _leave(" [destroyed]");