class VmoDiscardable
Defined at line 58 of file ../../src/storage/f2fs/vmo_manager.h
It manages the lifecycle of a discardable Vmo that Pages use in each vnode.
Public Methods
void VmoDiscardable (pgoff_t index, size_t size)Defined at line 46 of file ../../src/storage/f2fs/vmo_manager.cc
void ~VmoDiscardable ()Defined at line 50 of file ../../src/storage/f2fs/vmo_manager.cc
zx::result<bool> Lock (pgoff_t offset)It ensures that |vmo_| keeps VMO_OP_LOCK as long as any Pages refer to it
by calling Page::GetVmo(). When a valid page gets a new access to a |this|,
it increases VmoMapping::active_pages_, and then decreases VmoMapping::active_pages_
in Unlock() as a active page is truncated. When VmoMapping::active_pages_ reaches
zero, Unlock() does VMO_OP_UNLOCK for page reclaim.
When VmoMapping::active_pages is zero with new page access, it tries VMO_OP_TRY_LOCK
to check which pages kernel has reclaimed.
Defined at line 57 of file ../../src/storage/f2fs/vmo_manager.cc
void VmoDiscardable ()Defined at line 60 of file ../../src/storage/f2fs/vmo_manager.h
void VmoDiscardable (const VmoDiscardable & )Defined at line 61 of file ../../src/storage/f2fs/vmo_manager.h
VmoDiscardable & operator= (const VmoDiscardable & )Defined at line 62 of file ../../src/storage/f2fs/vmo_manager.h
void VmoDiscardable (const VmoDiscardable && )Defined at line 63 of file ../../src/storage/f2fs/vmo_manager.h
VmoDiscardable & operator= (const VmoDiscardable && )Defined at line 64 of file ../../src/storage/f2fs/vmo_manager.h
zx_status_t Unlock (pgoff_t offset)It unlocks |vmo_| when there is no Page using it.
Defined at line 90 of file ../../src/storage/f2fs/vmo_manager.cc
zx_status_t Zero (pgoff_t start, pgoff_t len)Defined at line 52 of file ../../src/storage/f2fs/vmo_manager.cc