ecryptfs: 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/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index bc71154..bfc2e0f 100644 (file)
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -35,6 +35,7 @@
 #include <linux/scatterlist.h>
 #include <linux/hash.h>
 #include <linux/nsproxy.h>
+#include <linux/backing-dev.h>
 
 /* Version verification for shared data structures w/ userspace */
 #define ECRYPTFS_VERSION_MAJOR 0x00
@@ -393,6 +394,7 @@ struct ecryptfs_mount_crypt_stat {
 struct ecryptfs_sb_info {
        struct super_block *wsi_sb;
        struct ecryptfs_mount_crypt_stat mount_crypt_stat;
+       struct backing_dev_info bdi;
 };
 
 /* file private data. */

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index af1a8f0..760983d 100644 (file)
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -497,17 +497,25 @@ struct kmem_cache *ecryptfs_sb_info_cache;
 static int
 ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
 {
+       struct ecryptfs_sb_info *esi;
        int rc = 0;
 
        /* Released in ecryptfs_put_super() */
        ecryptfs_set_superblock_private(sb,
                                        kmem_cache_zalloc(ecryptfs_sb_info_cache,
                                                         GFP_KERNEL));
-       if (!ecryptfs_superblock_to_private(sb)) {
+       esi = ecryptfs_superblock_to_private(sb);
+       if (!esi) {
                ecryptfs_printk(KERN_WARNING, "Out of memory\n");
                rc = -ENOMEM;
                goto out;
        }
+
+       rc = bdi_setup_and_register(&esi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
+       if (rc)
+               goto out;
+
+       sb->s_bdi = &esi->bdi;
        sb->s_op = &ecryptfs_sops;
        /* Released through deactivate_super(sb) from get_sb_nodev */
        sb->s_root = d_alloc(NULL, &(const struct qstr) {

diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index 278743c..0c0ae49 100644 (file)
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -122,6 +122,7 @@ static void ecryptfs_put_super(struct super_block *sb)
        lock_kernel();
 
        ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
+       bdi_destroy(&sb_info->bdi);
        kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
        ecryptfs_set_superblock_private(sb, NULL);