From: Jan Kara Subject: [PATCH 12/18] mm: Define MAP_SYNC and VM_SYNC flags Date: Wed, 1 Nov 2017 16:36:41 +0100 Message-ID: <20171101153648.30166-13-jack@suse.cz> References: <20171101153648.30166-1-jack@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jan Kara , linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Darrick J . Wong" , Christoph Hellwig , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dan Williams Return-path: In-Reply-To: <20171101153648.30166-1-jack-AlSwsSmVLrQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" List-Id: linux-ext4.vger.kernel.org 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 --- fs/proc/task_mmu.c | 1 + include/linux/mm.h | 1 + include/linux/mman.h | 8 ++++++-- include/uapi/asm-generic/mman.h | 1 + 4 files changed, 9 insertions(+), 2 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 5589b4bd4b85..ea78b37deeaa 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -664,6 +664,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) [ilog2(VM_ACCOUNT)] = "ac", [ilog2(VM_NORESERVE)] = "nr", [ilog2(VM_HUGETLB)] = "ht", + [ilog2(VM_SYNC)] = "sf", [ilog2(VM_ARCH_1)] = "ar", [ilog2(VM_WIPEONFORK)] = "wf", [ilog2(VM_DONTDUMP)] = "dd", diff --git a/include/linux/mm.h b/include/linux/mm.h index ca72b67153d5..5411cb7442de 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -189,6 +189,7 @@ extern unsigned int kobjsize(const void *objp); #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ +#define VM_SYNC 0x00800000 /* Synchronous page faults */ #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ diff --git a/include/linux/mman.h b/include/linux/mman.h index 94b63b4d71ff..8f7cc87828e6 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 @@ -125,7 +128,8 @@ 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); diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h index 7162cd4cca73..00e55627d2df 100644 --- a/include/uapi/asm-generic/mman.h +++ b/include/uapi/asm-generic/mman.h @@ -12,6 +12,7 @@ #define MAP_NONBLOCK 0x10000 /* do not block on IO */ #define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */ #define MAP_HUGETLB 0x40000 /* create a huge page mapping */ +#define MAP_SYNC 0x80000 /* perform synchronous page faults for the mapping */ /* Bits [26:31] are reserved, see mman-common.h for MAP_HUGETLB usage */ -- 2.12.3