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-rw-r--r--drivers/staging/android/binder.c13
-rw-r--r--fs/file.c16
-rw-r--r--include/linux/fdtable.h2
3 files changed, 18 insertions, 13 deletions
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 4946d28..9e1a98a 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -386,17 +386,8 @@ int task_get_unused_fd_flags(struct binder_proc *proc, int flags)
static void task_fd_install(
struct binder_proc *proc, unsigned int fd, struct file *file)
{
- struct files_struct *files = proc->files;
- struct fdtable *fdt;
-
- if (files == NULL)
- return;
-
- spin_lock(&files->file_lock);
- fdt = files_fdtable(files);
- BUG_ON(fdt->fd[fd] != NULL);
- rcu_assign_pointer(fdt->fd[fd], file);
- spin_unlock(&files->file_lock);
+ if (proc->files)
+ __fd_install(proc->files, fd, file);
}
/*
diff --git a/fs/file.c b/fs/file.c
index 78cf88f..0d1bf05 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -599,11 +599,18 @@ EXPORT_SYMBOL(put_unused_fd);
*
* It should never happen - if we allow dup2() do it, _really_ bad things
* will follow.
+ *
+ * NOTE: __fd_install() variant is really, really low-level; don't
+ * use it unless you are forced to by truly lousy API shoved down
+ * your throat. 'files' *MUST* be either current->files or obtained
+ * by get_files_struct(current) done by whoever had given it to you,
+ * or really bad things will happen. Normally you want to use
+ * fd_install() instead.
*/
-void fd_install(unsigned int fd, struct file *file)
+void __fd_install(struct files_struct *files, unsigned int fd,
+ struct file *file)
{
- struct files_struct *files = current->files;
struct fdtable *fdt;
spin_lock(&files->file_lock);
fdt = files_fdtable(files);
@@ -612,4 +619,9 @@ void fd_install(unsigned int fd, struct file *file)
spin_unlock(&files->file_lock);
}
+void fd_install(unsigned int fd, struct file *file)
+{
+ __fd_install(current->files, fd, file);
+}
+
EXPORT_SYMBOL(fd_install);
diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index 3855f4f..59d4fc7 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -121,6 +121,8 @@ struct files_struct *dup_fd(struct files_struct *, int *);
extern int __alloc_fd(struct files_struct *files,
unsigned start, unsigned end, unsigned flags);
+extern void __fd_install(struct files_struct *files,
+ unsigned int fd, struct file *file);
extern struct kmem_cache *files_cachep;
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