9p: 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/9p/v9fs.c b/fs/9p/v9fs.c
index 5c5bc84..f8b86e9 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -238,6 +238,13 @@
return ERR_PTR(-ENOMEM);
}
+ rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
+ if (rc) {
+ __putname(v9ses->aname);
+ __putname(v9ses->uname);
+ return ERR_PTR(rc);
+ }
+
spin_lock(&v9fs_sessionlist_lock);
list_add(&v9ses->slist, &v9fs_sessionlist);
spin_unlock(&v9fs_sessionlist_lock);
@@ -301,6 +308,7 @@
return fid;
error:
+ bdi_destroy(&v9ses->bdi);
return ERR_PTR(retval);
}
@@ -326,6 +334,8 @@
__putname(v9ses->uname);
__putname(v9ses->aname);
+ bdi_destroy(&v9ses->bdi);
+
spin_lock(&v9fs_sessionlist_lock);
list_del(&v9ses->slist);
spin_unlock(&v9fs_sessionlist_lock);
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index a0a8d3d..bec4d0b 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -20,6 +20,7 @@
* Boston, MA 02111-1301 USA
*
*/
+#include <linux/backing-dev.h>
/**
* enum p9_session_flags - option flags for each 9P session
@@ -102,6 +103,7 @@
u32 uid; /* if ACCESS_SINGLE, the uid that has access */
struct p9_client *clnt; /* 9p client */
struct list_head slist; /* list of sessions registered with v9fs */
+ struct backing_dev_info bdi;
};
struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 491108b..806da5d 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -77,6 +77,7 @@
sb->s_blocksize = 1 << sb->s_blocksize_bits;
sb->s_magic = V9FS_MAGIC;
sb->s_op = &v9fs_super_ops;
+ sb->s_bdi = &v9ses->bdi;
sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC |
MS_NOATIME;
