NFSv3: Fix posix ACL code

[safe/jmp/linux-2.6] / fs / nfs / nfs3acl.c

diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c
index cef6255..6bbf0e6 100644 (file)
--- a/fs/nfs/nfs3acl.c
+++ b/fs/nfs/nfs3acl.c
@@ -292,7 +292,7 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
 {
        struct nfs_server *server = NFS_SERVER(inode);
        struct nfs_fattr fattr;
-       struct page *pages[NFSACL_MAXPAGES] = { };
+       struct page *pages[NFSACL_MAXPAGES];
        struct nfs3_setaclargs args = {
                .inode = inode,
                .mask = NFS_ACL,
@@ -303,7 +303,7 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
                .rpc_argp       = &args,
                .rpc_resp       = &fattr,
        };
-       int status, count;
+       int status;
 
        status = -EOPNOTSUPP;
        if (!nfs_server_capable(inode, NFS_CAP_ACLS))
@@ -319,6 +319,20 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
        if (S_ISDIR(inode->i_mode)) {
                args.mask |= NFS_DFACL;
                args.acl_default = dfacl;
+               args.len = nfsacl_size(acl, dfacl);
+       } else
+               args.len = nfsacl_size(acl, NULL);
+
+       if (args.len > NFS_ACL_INLINE_BUFSIZE) {
+               unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
+
+               status = -ENOMEM;
+               do {
+                       args.pages[args.npages] = alloc_page(GFP_KERNEL);
+                       if (args.pages[args.npages] == NULL)
+                               goto out_freepages;
+                       args.npages++;
+               } while (args.npages < npages);
        }
 
        dprintk("NFS call setacl\n");
@@ -329,10 +343,6 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
        nfs_zap_acl_cache(inode);
        dprintk("NFS reply setacl: %d\n", status);
 
-       /* pages may have been allocated at the xdr layer. */
-       for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
-               __free_page(args.pages[count]);
-
        switch (status) {
                case 0:
                        status = nfs_refresh_inode(inode, &fattr);
@@ -346,6 +356,11 @@ static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
                case -ENOTSUPP:
                        status = -EOPNOTSUPP;
        }
+out_freepages:
+       while (args.npages != 0) {
+               args.npages--;
+               __free_page(args.pages[args.npages]);
+       }
 out:
        return status;
 }