From b6fb293f2497a9841d94f6b57bd2bb2cd222da43 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 1 Nov 2017 16:36:41 +0100 Subject: mm: Define MAP_SYNC and VM_SYNC flags Define new MAP_SYNC flag and corresponding VMA VM_SYNC flag. As the MAP_SYNC flag is not part of LEGACY_MAP_MASK, currently it will be refused by all MAP_SHARED_VALIDATE map attempts and silently ignored for everything else. Reviewed-by: Ross Zwisler Reviewed-by: Christoph Hellwig Signed-off-by: Jan Kara Signed-off-by: Dan Williams --- include/linux/mman.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'include/linux/mman.h') diff --git a/include/linux/mman.h b/include/linux/mman.h index 74452e3..3427bf3 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -9,7 +9,7 @@ /* * Arrange for legacy / undefined architecture specific flags to be - * ignored by default in LEGACY_MAP_MASK. + * ignored by mmap handling code. */ #ifndef MAP_32BIT #define MAP_32BIT 0 @@ -23,6 +23,9 @@ #ifndef MAP_UNINITIALIZED #define MAP_UNINITIALIZED 0 #endif +#ifndef MAP_SYNC +#define MAP_SYNC 0 +#endif /* * The historical set of flags that all mmap implementations implicitly @@ -126,7 +129,8 @@ calc_vm_flag_bits(unsigned long flags) { return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) | _calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) | - _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ); + _calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) | + _calc_vm_trans(flags, MAP_SYNC, VM_SYNC ); } unsigned long vm_commit_limit(void); -- cgit v1.1