commit 5c15c6f7b42197266ac8278ac6294d6a0b62fbba
Author: Erez Zadok <[email protected]>
Date: Tue Sep 22 17:34:23 2009 -0400
Unionfs: fix readonly nfs2/3 permission handling
In unionfs_permission: NFSv2/3 return EACCES on readonly-exported, locally
readonly-mounted file systems, instead of EROFS like other file systems do.
So we have no choice here but to intercept this and ignore it for NFS
branches marked readonly. Specifically, we avoid using NFS's own "broken"
->permission method, and rely on generic_permission() to do basic checking
for us.
Signed-off-by: Erez Zadok <[email protected]>
diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 68e6985..31391c8 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -846,6 +846,20 @@ static int unionfs_permission(struct inode *inode, int
mask,
}
/*
+ * NFS HACK: NFSv2/3 return EACCES on readonly-exported,
+ * locally readonly-mounted file systems, instead of EROFS
+ * like other file systems do. So we have no choice here
+ * but to intercept this and ignore it for NFS branches
+ * marked readonly. Specifically, we avoid using NFS's own
+ * "broken" ->permission method, and rely on
+ * generic_permission() to do basic checking for us.
+ */
+ if (err && err == -EACCES &&
+ is_robranch_super(inode->i_sb, bindex) &&
+ lower_inode->i_sb->s_magic == NFS_SUPER_MAGIC)
+ err = generic_permission(lower_inode, mask, NULL);
+
+ /*
* The permissions are an intersection of the overall directory
* permissions, so we fail if one fails.
*/
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