ext4: Simplify DAX fault path

Now that dax_iomap_fault() calls ->iomap_begin() without entry lock, we
can use transaction starting in ext4_iomap_begin() and thus simplify
ext4_dax_fault(). It also provides us proper retries in case of ENOSPC.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

path: root/tools/include/asm/atomic.h

#ifndef __TOOLS_LINUX_ASM_ATOMIC_H
#define __TOOLS_LINUX_ASM_ATOMIC_H

#if defined(__i386__) || defined(__x86_64__)
#include "../../arch/x86/include/asm/atomic.h"
#else
#include <asm-generic/atomic-gcc.h>
#endif

#endif /* __TOOLS_LINUX_ASM_ATOMIC_H */