Take fs_struct handling to new file (fs/fs_struct.c)

Pure code move; two new helper functions for nfsd and daemonize
(unshare_fs_struct() and daemonize_fs_struct() resp.; for now -
the same code as used to be in callers).  unshare_fs_struct()
exported (for nfsd, as copy_fs_struct()/exit_fs() used to be),
copy_fs_struct() and exit_fs() don't need exports anymore.

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

1 files changed, 1 insertions, 30 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 167e1e3ad7c6..ad8375758a79 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -429,7 +429,6 @@ EXPORT_SYMBOL(disallow_signal);
 void daemonize(const char *name, ...)
 {
         va_list args;
-        struct fs_struct *fs;
         sigset_t blocked;
 
         va_start(args, name);
@@ -462,11 +461,7 @@ void daemonize(const char *name, ...)
 
         /* Become as one with the init task */
 
-        exit_fs(current);       /* current->fs->count--; */
-        fs = init_task.fs;
-        current->fs = fs;
-        atomic_inc(&fs->count);
-
+        daemonize_fs_struct();
         exit_files(current);
         current->files = init_task.files;
         atomic_inc(&current->files->count);
@@ -565,30 +560,6 @@ void exit_files(struct task_struct *tsk)
         }
 }
 
-void put_fs_struct(struct fs_struct *fs)
-{
-        /* No need to hold fs->lock if we are killing it */
-        if (atomic_dec_and_test(&fs->count)) {
-                path_put(&fs->root);
-                path_put(&fs->pwd);
-                kmem_cache_free(fs_cachep, fs);
-        }
-}
-
-void exit_fs(struct task_struct *tsk)
-{
-        struct fs_struct * fs = tsk->fs;
-
-        if (fs) {
-                task_lock(tsk);
-                tsk->fs = NULL;
-                task_unlock(tsk);
-                put_fs_struct(fs);
-        }
-}
-
-EXPORT_SYMBOL_GPL(exit_fs);
-
 #ifdef CONFIG_MM_OWNER
 /*
  * Task p is exiting and it owned mm, lets find a new owner for it