[PATCH] NFS: Fix handling of the umask when an NFSv3 default acl is present.

 NFSv3 has no concept of a umask on the server side: The client applies
 the umask locally, and sends the effective permissions to the server.
 This behavior is wrong when files are created in a directory that has a
 default ACL.  In this case, the umask is supposed to be ignored, and
 only the default ACL determines the file's effective permissions.

 Usually its the server's task to conditionally apply the umask.  But
 since the server knows nothing about the umask, we have to do it on the
 client side.  This patch tries to fetch the parent directory's default
 ACL before creating a new file, computes the appropriate create mode to
 send to the server, and finally sets the new file's access and default
 acl appropriately.

 Many thanks to Buck Huppmann <buchk@pobox.com> for sending the initial
 version of this patch, as well as for arguing why we need this change.

 Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
 Acked-by: Olaf Kirch <okir@suse.de>
 Signed-off-by: Andrew Morton <akpm@osdl.org>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 30 insertions, 6 deletions

diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index d03bac0cc42f..a9ddc196224d 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -314,7 +314,8 @@ nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
                 .fh             = &fhandle,
                 .fattr          = &fattr
         };
-        int                     status;
+        mode_t mode = sattr->ia_mode;
+        int status;
 
         dprintk("NFS call  create %s\n", dentry->d_name.name);
         arg.createmode = NFS3_CREATE_UNCHECKED;
@@ -324,6 +325,8 @@ nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
                 arg.verifier[1] = current->pid;
         }
 
+        sattr->ia_mode &= ~current->fs->umask;
+
 again:
         dir_attr.valid = 0;
         fattr.valid = 0;
@@ -370,6 +373,9 @@ again:
                 nfs_refresh_inode(dentry->d_inode, &fattr);
                 dprintk("NFS reply setattr (post-create): %d\n", status);
         }
+        if (status != 0)
+                goto out;
+        status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
 out:
         dprintk("NFS reply create: %d\n", status);
         return status;
@@ -539,15 +545,24 @@ nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
                 .fh             = &fhandle,
                 .fattr          = &fattr
         };
-        int                     status;
+        int mode = sattr->ia_mode;
+        int status;
 
         dprintk("NFS call  mkdir %s\n", dentry->d_name.name);
         dir_attr.valid = 0;
         fattr.valid = 0;
+
+        sattr->ia_mode &= ~current->fs->umask;
+
         status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKDIR, &arg, &res, 0);
         nfs_refresh_inode(dir, &dir_attr);
-        if (status == 0)
-                status = nfs_instantiate(dentry, &fhandle, &fattr);
+        if (status != 0)
+                goto out;
+        status = nfs_instantiate(dentry, &fhandle, &fattr);
+        if (status != 0)
+                goto out;
+        status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
+out:
         dprintk("NFS reply mkdir: %d\n", status);
         return status;
 }
@@ -642,6 +657,7 @@ nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
                 .fh             = &fh,
                 .fattr          = &fattr
         };
+        mode_t mode = sattr->ia_mode;
         int status;
 
         switch (sattr->ia_mode & S_IFMT) {
@@ -654,12 +670,20 @@ nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
 
         dprintk("NFS call  mknod %s %u:%u\n", dentry->d_name.name,
                         MAJOR(rdev), MINOR(rdev));
+
+        sattr->ia_mode &= ~current->fs->umask;
+
         dir_attr.valid = 0;
         fattr.valid = 0;
         status = rpc_call(NFS_CLIENT(dir), NFS3PROC_MKNOD, &arg, &res, 0);
         nfs_refresh_inode(dir, &dir_attr);
-        if (status == 0)
-                status = nfs_instantiate(dentry, &fh, &fattr);
+        if (status != 0)
+                goto out;
+        status = nfs_instantiate(dentry, &fh, &fattr);
+        if (status != 0)
+                goto out;
+        status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
+out:
         dprintk("NFS reply mknod: %d\n", status);
         return status;
 }