Hello,
The attached patch solves the problem,
Thanks,
Jordi Pujol
Live never ending Tale
GNU/Linux Live forever!
http://livenet.selfip.com
overlayfs v10:
- Test for readonly using the vfsmount superblock
from the main filesystem.
- Ignore WRITE request for the real filesystems.
Signed-off-by: Jordi Pujol <jordipujolp@xxxxxxxxx>
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c 2011-06-05 10:06:25.323823937 +0200
@@ -54,6 +54,9 @@ int ovl_permission(struct inode *inode,
bool is_upper;
int err;
+ if (mask & MAY_WRITE && IS_RDONLY(inode))
+ return -EROFS;
+
if (S_ISDIR(inode->i_mode)) {
oe = inode->i_private;
} else if (flags & IPERM_FLAG_RCU) {
@@ -102,6 +105,8 @@ int ovl_permission(struct inode *inode,
err = -EACCES;
if (IS_IMMUTABLE(realinode))
goto out_dput;
+
+ mask &= ~MAY_WRITE;
}
if (realinode->i_op->permission)
