atomic_open(): lift the call of may_open() into do_last()

there we'll be able to merge it with its counterparts in other
cases, and there's no reason to do it before the parent has
been unlocked

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index 88f985a..7e932d9 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2949,23 +2949,12 @@ static struct dentry *atomic_open(struct nameidata *nd, struct dentry *dentry,
        d_lookup_done(dentry);
        if (!error) {
                if (file->f_mode & FMODE_OPENED) {
-                       int acc_mode = op->acc_mode;
                        if (unlikely(dentry != file->f_path.dentry)) {
                                dput(dentry);
                                dentry = dget(file->f_path.dentry);
                        }
-                       /*
-                        * We didn't have the inode before the open, so check open
-                        * permission here.
-                        */
-                       if (file->f_mode & FMODE_CREATED) {
-                               WARN_ON(!(open_flag & O_CREAT));
+                       if (file->f_mode & FMODE_CREATED)
                                fsnotify_create(dir, dentry);
-                               acc_mode = 0;
-                       }
-                       error = may_open(&file->f_path, acc_mode, open_flag);
-                       if (WARN_ON(error > 0))
-                               error = -EINVAL;
                } else if (WARN_ON(file->f_path.dentry == DENTRY_NOT_SET)) {
                        error = -EIO;
                } else {
@@ -3208,12 +3197,19 @@ static const char *do_last(struct nameidata *nd,
        }
 
        if (file->f_mode & FMODE_OPENED) {
-               if ((file->f_mode & FMODE_CREATED) ||
-                   !S_ISREG(file_inode(file)->i_mode))
+               if (file->f_mode & FMODE_CREATED) {
+                       open_flag &= ~O_TRUNC;
+                       will_truncate = false;
+                       acc_mode = 0;
+               } else if (!S_ISREG(file_inode(file)->i_mode))
                        will_truncate = false;
 
                audit_inode(nd->name, file->f_path.dentry, 0);
-               dput(dentry);
+               dput(nd->path.dentry);
+               nd->path.dentry = dentry;
+               error = may_open(&nd->path, acc_mode, open_flag);
+               if (error)
+                       goto out;
                goto opened;
        }