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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 <ross.zwisler@linux.intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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4 changed files with 9 additions and 2 deletions
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@ -664,6 +664,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
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[ilog2(VM_ACCOUNT)] = "ac",
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[ilog2(VM_NORESERVE)] = "nr",
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[ilog2(VM_HUGETLB)] = "ht",
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[ilog2(VM_SYNC)] = "sf",
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[ilog2(VM_ARCH_1)] = "ar",
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[ilog2(VM_WIPEONFORK)] = "wf",
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[ilog2(VM_DONTDUMP)] = "dd",
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@ -189,6 +189,7 @@ extern unsigned int kobjsize(const void *objp);
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#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
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#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */
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#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
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#define VM_SYNC 0x00800000 /* Synchronous page faults */
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#define VM_ARCH_1 0x01000000 /* Architecture-specific flag */
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#define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */
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#define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */
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@ -9,7 +9,7 @@
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/*
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* Arrange for legacy / undefined architecture specific flags to be
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* ignored by default in LEGACY_MAP_MASK.
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* ignored by mmap handling code.
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*/
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#ifndef MAP_32BIT
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#define MAP_32BIT 0
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@ -23,6 +23,9 @@
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#ifndef MAP_UNINITIALIZED
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#define MAP_UNINITIALIZED 0
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#endif
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#ifndef MAP_SYNC
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#define MAP_SYNC 0
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#endif
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/*
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* The historical set of flags that all mmap implementations implicitly
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@ -126,7 +129,8 @@ calc_vm_flag_bits(unsigned long flags)
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{
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return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
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_calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
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_calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
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_calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED ) |
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_calc_vm_trans(flags, MAP_SYNC, VM_SYNC );
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}
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unsigned long vm_commit_limit(void);
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@ -12,6 +12,7 @@
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#define MAP_NONBLOCK 0x10000 /* do not block on IO */
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#define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */
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#define MAP_HUGETLB 0x40000 /* create a huge page mapping */
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#define MAP_SYNC 0x80000 /* perform synchronous page faults for the mapping */
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/* Bits [26:31] are reserved, see mman-common.h for MAP_HUGETLB usage */
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