[PATCH] dup_fd() - part 3

merge alloc_files() into dup_fd(), leave setting newf->fdt until the end

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

diff --git a/fs/file.c b/fs/file.c
index 6491b2b5bc3828fd012a094d93216b67b31b9f0e..689d2b6947e3e2da5dabf76d7e8512186b4eec40 100644 (file)
--- a/fs/file.c
+++ b/fs/file.c
@@ -273,31 +273,6 @@ static int count_open_files(struct fdtable *fdt)
        return i;
 }
 
-static struct files_struct *alloc_files(void)
-{
-       struct files_struct *newf;
-       struct fdtable *fdt;
-
-       newf = kmem_cache_alloc(files_cachep, GFP_KERNEL);
-       if (!newf)
-               goto out;
-
-       atomic_set(&newf->count, 1);
-
-       spin_lock_init(&newf->file_lock);
-       newf->next_fd = 0;
-       fdt = &newf->fdtab;
-       fdt->max_fds = NR_OPEN_DEFAULT;
-       fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
-       fdt->open_fds = (fd_set *)&newf->open_fds_init;
-       fdt->fd = &newf->fd_array[0];
-       INIT_RCU_HEAD(&fdt->rcu);
-       fdt->next = NULL;
-       rcu_assign_pointer(newf->fdt, fdt);
-out:
-       return newf;
-}
-
 /*
  * Allocate a new files structure and copy contents from the
  * passed in files structure.
@@ -311,13 +286,24 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
        struct fdtable *old_fdt, *new_fdt;
 
        *errorp = -ENOMEM;
-       newf = alloc_files();
+       newf = kmem_cache_alloc(files_cachep, GFP_KERNEL);
        if (!newf)
                goto out;
 
+       atomic_set(&newf->count, 1);
+
+       spin_lock_init(&newf->file_lock);
+       newf->next_fd = 0;
+       new_fdt = &newf->fdtab;
+       new_fdt->max_fds = NR_OPEN_DEFAULT;
+       new_fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
+       new_fdt->open_fds = (fd_set *)&newf->open_fds_init;
+       new_fdt->fd = &newf->fd_array[0];
+       INIT_RCU_HEAD(&new_fdt->rcu);
+       new_fdt->next = NULL;
+
        spin_lock(&oldf->file_lock);
        old_fdt = files_fdtable(oldf);
-       new_fdt = files_fdtable(newf);
        open_files = count_open_files(old_fdt);
 
        /*
@@ -341,7 +327,6 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
                        *errorp = -EMFILE;
                        goto out_release;
                }
-               rcu_assign_pointer(files->fdt, new_fdt);
 
                /*
                 * Reacquire the oldf lock and a pointer to its fd table
@@ -391,6 +376,8 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
                memset(&new_fdt->close_on_exec->fds_bits[start], 0, left);
        }
 
+       rcu_assign_pointer(newf->fdt, new_fdt);
+
        return newf;
 
 out_release: