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Several changes: 

- Rename EX_NOBLOB to EX_NOCOALESCE; it's much more descriptive of
  what's going on.
- Use ALIGN(), rather than our homegrown EXTENT_ALIGN(), when dealing
  with map overhead.  Privatize the EXTENT_ALIGN() macro; there's no need
  to export it.
- Implement EX_BOUNDZERO flag.  This changes the boundary line policy in
  extent_alloc() and extent_alloc_subregion(); boundary lines are
  computed relative to 0, rather then the start of the extent.
- Add a new flag to specify that it's ok to wait for space in the
  extent: EX_WAITSPACE.
- Add some whitespace in the function prototypes.
This commit is contained in:
thorpej 1996-10-17 08:29:05 +00:00
parent 52c0d38a1a
commit 2487643691
1 changed files with 18 additions and 19 deletions
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37
sys/sys/extent.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: extent.h,v 1.3 1996/08/09 00:00:13 thorpej Exp $ */
/* $NetBSD: extent.h,v 1.4 1996/10/17 08:29:05 thorpej Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
@ -71,19 +71,21 @@ struct extent_fixed {
/* ex_flags; for internal use only */
#define EXF_FIXED 0x01 /* extent uses fixed storage */
#define EXF_NOBLOB 0x02 /* solid chunks, not goey blobs */
#define EXF_NOCOALESCE 0x02 /* coalescing of regions not allowed */
#define EXF_WANTED 0x04 /* someone asleep on extent */
#define EXF_FLWANTED 0x08 /* someone asleep on freelist */
#define EXF_BITS "\20\4FLWANTED\3WANTED\2NOBLOB\1FIXED"
#define EXF_BITS "\20\4FLWANTED\3WANTED\2NOCOALESCE\1FIXED"
/* misc. flags passed to extent functions */
#define EX_NOWAIT 0x00 /* not safe to sleep */
#define EX_WAITOK 0x01 /* safe to sleep */
#define EX_FAST 0x02 /* take first fit in extent_alloc() */
#define EX_CATCH 0x04 /* catch signals while sleeping */
#define EX_NOBLOB 0x08 /* create a non-blobbing extent */
#define EX_NOCOALESCE 0x08 /* create a non-coalescing extent */
#define EX_MALLOCOK 0x10 /* safe to call malloc() */
#define EX_WAITSPACE 0x20 /* wait for space to become free */
#define EX_BOUNDZERO 0x40 /* boundary lines start at 0 */
/*
* Special place holders for "alignment" and "boundary" arguments,
@ -93,22 +95,19 @@ struct extent_fixed {
#define EX_NOBOUNDARY 0 /* don't do boundary checking */
#ifdef _KERNEL
#define EXTENT_ALIGN(_start, _align) \
(((_start) + ((_align) - 1)) & (-(_align)))
#define EXTENT_FIXED_STORAGE_SIZE(_nregions) \
(ALIGN(sizeof(struct extent_fixed)) + \
((ALIGN(sizeof(struct extent_region))) * \
(_nregions)))
#define EXTENT_FIXED_STORAGE_SIZE(_nregions) \
(EXTENT_ALIGN(sizeof(struct extent_fixed), sizeof(long)) + \
((EXTENT_ALIGN(sizeof(struct extent_region), sizeof(long))) * \
(_nregions)))
struct extent *extent_create __P((char *, u_long, u_long, int,
caddr_t, size_t, int));
void extent_destroy __P((struct extent *));
int extent_alloc_subregion __P((struct extent *, u_long, u_long,
u_long, u_long, u_long, int, u_long *));
int extent_alloc_region __P((struct extent *, u_long, u_long, int));
int extent_free __P((struct extent *, u_long, u_long, int));
void extent_print __P((struct extent *));
struct extent *extent_create __P((char *, u_long, u_long, int,
caddr_t, size_t, int));
void extent_destroy __P((struct extent *));
int extent_alloc_subregion __P((struct extent *, u_long, u_long,
u_long, u_long, u_long, int, u_long *));
int extent_alloc_region __P((struct extent *, u_long, u_long, int));
int extent_free __P((struct extent *, u_long, u_long, int));
void extent_print __P((struct extent *));
/* Simple case of extent_alloc_subregion() */
#define extent_alloc(_ex, _size, _alignment, _boundary, _flags, _result) \