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Subject[RFC PATCH -V2 11/17] fs/9p: Implement syncfs call back for 9Pfs
Date
FIXME!! what about dotu ?

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/9p/v9fs.h | 1 +
fs/9p/vfs_super.c | 19 +++++++++++++++++--
2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index c4b5d88..41f29b9 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -109,6 +109,7 @@ struct v9fs_session_info {
struct list_head slist; /* list of sessions registered with v9fs */
struct backing_dev_info bdi;
struct rw_semaphore rename_sem;
+ struct p9_fid *root_fid; /* Used for file system sync */
};

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 76e11e8..fde5fe2 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -152,7 +152,6 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
retval = PTR_ERR(inode);
goto release_sb;
}
-
root = d_alloc_root(inode);
if (!root) {
iput(inode);
@@ -188,6 +187,13 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
if (retval)
goto release_sb;
v9fs_fid_add(root, fid);
+ /*
+ * Add the root fid to session info. This is used
+ * for file system sync. We want a cloned fid here
+ * so that we can do a sync_filesystem after a
+ * shrink_dcache_for_umount
+ */
+ v9ses->root_fid = v9fs_fid_clone(root);

P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
return dget(sb->s_root);
@@ -224,7 +230,7 @@ static void v9fs_kill_super(struct super_block *s)
P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s);

kill_anon_super(s);
-
+ p9_client_clunk(v9ses->root_fid);
v9fs_session_cancel(v9ses);
v9fs_session_close(v9ses);
kfree(v9ses);
@@ -277,6 +283,14 @@ done:
return res;
}

+static int v9fs_sync_fs(struct super_block *sb, int wait)
+{
+ struct v9fs_session_info *v9ses = sb->s_fs_info;
+
+ P9_DPRINTK(P9_DEBUG_VFS, "v9fs_sync_fs: super_block %p\n", sb);
+ return p9_client_sync_fs(v9ses->root_fid);
+}
+
static const struct super_operations v9fs_super_ops = {
#ifdef CONFIG_9P_FSCACHE
.alloc_inode = v9fs_alloc_inode,
@@ -293,6 +307,7 @@ static const struct super_operations v9fs_super_ops_dotl = {
.alloc_inode = v9fs_alloc_inode,
.destroy_inode = v9fs_destroy_inode,
#endif
+ .sync_fs = v9fs_sync_fs,
.statfs = v9fs_statfs,
.evict_inode = v9fs_evict_inode,
.show_options = generic_show_options,
--
1.7.1


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