From: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
To: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>,
linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH 12/17] mm: Define MAP_SYNC and VM_SYNC flags
Date: Tue, 24 Oct 2017 17:24:09 +0200 [thread overview]
Message-ID: <20171024152415.22864-13-jack@suse.cz> (raw)
In-Reply-To: <20171024152415.22864-1-jack-AlSwsSmVLrQ@public.gmane.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 <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Signed-off-by: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
---
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
next prev parent reply other threads:[~2017-10-24 15:24 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-24 15:23 [PATCH 0/17 v5] dax, ext4, xfs: Synchronous page faults Jan Kara
[not found] ` <20171024152415.22864-1-jack-AlSwsSmVLrQ@public.gmane.org>
2017-10-24 15:23 ` [PATCH 01/17] mm: introduce MAP_SHARED_VALIDATE, a mechanism to safely define new mmap flags Jan Kara
[not found] ` <20171024152415.22864-2-jack-AlSwsSmVLrQ@public.gmane.org>
2017-10-24 21:21 ` Ross Zwisler
2017-10-24 15:23 ` [PATCH 02/17] mm: Remove VM_FAULT_HWPOISON_LARGE_MASK Jan Kara
2017-10-24 15:24 ` [PATCH 03/17] dax: Simplify arguments of dax_insert_mapping() Jan Kara
2017-10-24 15:24 ` [PATCH 05/17] dax: Create local variable for VMA in dax_iomap_pte_fault() Jan Kara
2017-10-24 15:24 ` [PATCH 06/17] dax: Create local variable for vmf->flags & FAULT_FLAG_WRITE test Jan Kara
2017-10-24 15:24 ` [PATCH 07/17] dax: Inline dax_insert_mapping() into the callsite Jan Kara
2017-10-24 15:24 ` [PATCH 08/17] dax: Inline dax_pmd_insert_mapping() " Jan Kara
2017-10-24 15:24 ` [PATCH 09/17] dax: Fix comment describing dax_iomap_fault() Jan Kara
2017-10-24 15:24 ` [PATCH 10/17] dax: Allow dax_iomap_fault() to return pfn Jan Kara
2017-10-24 15:24 ` Jan Kara [this message]
2017-10-24 15:24 ` [PATCH 13/17] dax, iomap: Add support for synchronous faults Jan Kara
2017-10-24 15:24 ` [PATCH 15/17] ext4: Simplify error handling in ext4_dax_huge_fault() Jan Kara
2017-10-24 15:24 ` [PATCH 16/17] ext4: Support for synchronous DAX faults Jan Kara
2017-10-24 15:24 ` [PATCH] mmap.2: Add description of MAP_SHARED_VALIDATE and MAP_SYNC Jan Kara
2017-10-24 21:10 ` Ross Zwisler
2017-10-26 13:24 ` Jan Kara
[not found] ` <20171026132402.GB31161-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2017-10-26 18:22 ` Ross Zwisler
2017-10-24 15:24 ` [PATCH 04/17] dax: Factor out getting of pfn out of iomap Jan Kara
2017-10-24 15:24 ` [PATCH 11/17] dax: Allow tuning whether dax_insert_mapping_entry() dirties entry Jan Kara
2017-10-24 15:24 ` [PATCH 14/17] dax: Implement dax_finish_sync_fault() Jan Kara
2017-10-24 15:24 ` [PATCH 17/17] xfs: support for synchronous DAX faults Jan Kara
2017-10-24 21:29 ` Ross Zwisler
2017-10-24 22:23 ` Dave Chinner
2017-10-26 15:48 ` Jan Kara
[not found] ` <20171026154804.GF31161-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2017-10-26 21:16 ` Dave Chinner
2017-10-27 10:08 ` Jan Kara
[not found] ` <20171027100834.GH31161-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2017-10-31 15:19 ` Jan Kara
[not found] ` <20171031151907.GB26128-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2017-10-31 21:50 ` Dan Williams
[not found] ` <CAPcyv4gBVyZ8KhB2s1M0BdhC1=HAean6Mb6oV7zsJBx0-t3bhw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-01 3:47 ` Ross Zwisler
2017-10-27 6:43 ` Christoph Hellwig
[not found] ` <20171027064301.GC22931-jcswGhMUV9g@public.gmane.org>
2017-10-27 9:13 ` Jan Kara
-- strict thread matches above, loose matches on Subject: below --
2017-10-19 12:57 [PATCH 0/17 v4] dax, ext4, xfs: Synchronous page faults Jan Kara
2017-10-19 12:58 ` [PATCH 12/17] mm: Define MAP_SYNC and VM_SYNC flags Jan Kara
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