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Commit b6fb293f authored by Jan Kara's avatar Jan Kara Committed by Dan Williams
Browse files

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: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent f5b7b748

fs/proc/task_mmu.c

+1 −0
Original line number Diff line number Diff line
@@ -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",

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

include/linux/mman.h

+6 −2
Original line number Diff line number Diff line
@@ -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);

include/uapi/asm-generic/mman.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */