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Subject[PATCH 05/16] Unionfs: call statfs on lower file system properly
Date
From: Erez Zadok <ezk@cs.sunysb.edu>

Get the correct lower dentry to use to statfs the first branch (always),

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Signed-off-by: Josef 'Jeff' Sipek <jsipek@cs.sunysb.edu>
---
fs/unionfs/super.c | 15 ++++++++++-----
1 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index b3a5e64..a7ff06c 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -112,18 +112,23 @@ static void unionfs_put_super(struct super_block *sb)
static int unionfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int err = 0;
- struct super_block *sb, *hidden_sb;
+ struct super_block *sb;
+ struct dentry *lower_dentry;

BUG_ON(!is_valid_dentry(dentry));

sb = dentry->d_sb;

- unionfs_read_lock(sb);
- hidden_sb = unionfs_lower_super_idx(sb, sbstart(sb));
- unionfs_read_unlock(sb);
- err = vfs_statfs(hidden_sb->s_root, buf);
+ lower_dentry = unionfs_lower_dentry(sb->s_root);
+ err = vfs_statfs(lower_dentry, buf);

+ /* set return buf to our f/s to avoid confusing user-level utils */
buf->f_type = UNIONFS_SUPER_MAGIC;
+
+ /*
+ * Our maximum file name can is shorter by a few bytes because every
+ * file name could potentially be whited-out.
+ */
buf->f_namelen -= UNIONFS_WHLEN;

memset(&buf->f_fsid, 0, sizeof(__kernel_fsid_t));
--
1.5.2.rc1.165.gaf9b
-
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