[thirdparty/git.git] / pack-objects.h

#ifndef PACK_OBJECTS_H
#define PACK_OBJECTS_H

#include "object-store.h"
#include "thread-utils.h"
#include "pack.h"

#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)

#define OE_DFS_STATE_BITS	2
#define OE_DEPTH_BITS		12
#define OE_IN_PACK_BITS		10
#define OE_Z_DELTA_BITS		20
/*
 * Note that oe_set_size() becomes expensive when the given size is
 * above this limit. Don't lower it too much.
 */
#define OE_SIZE_BITS		31
#define OE_DELTA_SIZE_BITS	23

/*
 * State flags for depth-first search used for analyzing delta cycles.
 *
 * The depth is measured in delta-links to the base (so if A is a delta
 * against B, then A has a depth of 1, and B a depth of 0).
 */
enum dfs_state {
	DFS_NONE = 0,
	DFS_ACTIVE,
	DFS_DONE,
	DFS_NUM_STATES
};

/*
 * The size of struct nearly determines pack-objects's memory
 * consumption. This struct is packed tight for that reason. When you
 * add or reorder something in this struct, think a bit about this.
 *
 * basic object info
 * -----------------
 * idx.oid is filled up before delta searching starts. idx.crc32 is
 * only valid after the object is written out and will be used for
 * generating the index. idx.offset will be both gradually set and
 * used in writing phase (base objects get offset first, then deltas
 * refer to them)
 *
 * "size" is the uncompressed object size. Compressed size of the raw
 * data for an object in a pack is not stored anywhere but is computed
 * and made available when reverse .idx is made. Note that when a
 * delta is reused, "size" is the uncompressed _delta_ size, not the
 * canonical one after the delta has been applied.
 *
 * "hash" contains a path name hash which is used for sorting the
 * delta list and also during delta searching. Once prepare_pack()
 * returns it's no longer needed.
 *
 * source pack info
 * ----------------
 * The (in_pack, in_pack_offset) tuple contains the location of the
 * object in the source pack. in_pack_header_size allows quickly
 * skipping the header and going straight to the zlib stream.
 *
 * "type" and "in_pack_type" both describe object type. in_pack_type
 * may contain a delta type, while type is always the canonical type.
 *
 * deltas
 * ------
 * Delta links (delta, delta_child and delta_sibling) are created to
 * reflect that delta graph from the source pack then updated or added
 * during delta searching phase when we find better deltas.
 *
 * delta_child and delta_sibling are last needed in
 * compute_write_order(). "delta" and "delta_size" must remain valid
 * at object writing phase in case the delta is not cached.
 *
 * If a delta is cached in memory and is compressed, delta_data points
 * to the data and z_delta_size contains the compressed size. If it's
 * uncompressed [1], z_delta_size must be zero. delta_size is always
 * the uncompressed size and must be valid even if the delta is not
 * cached.
 *
 * [1] during try_delta phase we don't bother with compressing because
 * the delta could be quickly replaced with a better one.
 */
struct object_entry {
	struct pack_idx_entry idx;
	void *delta_data;	/* cached delta (uncompressed) */
	off_t in_pack_offset;
	uint32_t hash;			/* name hint hash */
	unsigned size_:OE_SIZE_BITS;
	unsigned size_valid:1;
	uint32_t delta_idx;	/* delta base object */
	uint32_t delta_child_idx; /* deltified objects who bases me */
	uint32_t delta_sibling_idx; /* other deltified objects who
				     * uses the same base as me
				     */
	unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
	unsigned delta_size_valid:1;
	unsigned char in_pack_header_size;
	unsigned in_pack_idx:OE_IN_PACK_BITS;	/* already in pack */
	unsigned z_delta_size:OE_Z_DELTA_BITS;
	unsigned type_valid:1;
	unsigned no_try_delta:1;
	unsigned type_:TYPE_BITS;
	unsigned in_pack_type:TYPE_BITS; /* could be delta */
	unsigned preferred_base:1; /*
				    * we do not pack this, but is available
				    * to be used as the base object to delta
				    * objects against.
				    */
	unsigned tagged:1; /* near the very tip of refs */
	unsigned filled:1; /* assigned write-order */
	unsigned dfs_state:OE_DFS_STATE_BITS;
	unsigned depth:OE_DEPTH_BITS;

	/*
	 * pahole results on 64-bit linux (gcc and clang)
	 *
	 *   size: 80, bit_padding: 9 bits
	 *
	 * and on 32-bit (gcc)
	 *
	 *   size: 76, bit_padding: 9 bits
	 */
};

struct packing_data {
	struct object_entry *objects;
	uint32_t nr_objects, nr_alloc;

	int32_t *index;
	uint32_t index_size;

	unsigned int *in_pack_pos;
	unsigned long *delta_size;

	/*
	 * Only one of these can be non-NULL and they have different
	 * sizes. if in_pack_by_idx is allocated, oe_in_pack() returns
	 * the pack of an object using in_pack_idx field. If not,
	 * in_pack[] array is used the same way as in_pack_pos[]
	 */
	struct packed_git **in_pack_by_idx;
	struct packed_git **in_pack;

#ifndef NO_PTHREADS
	pthread_mutex_t lock;
#endif

	uintmax_t oe_size_limit;
	uintmax_t oe_delta_size_limit;
};

void prepare_packing_data(struct packing_data *pdata);

static inline void packing_data_lock(struct packing_data *pdata)
{
#ifndef NO_PTHREADS
	pthread_mutex_lock(&pdata->lock);
#endif
}
static inline void packing_data_unlock(struct packing_data *pdata)
{
#ifndef NO_PTHREADS
	pthread_mutex_unlock(&pdata->lock);
#endif
}

struct object_entry *packlist_alloc(struct packing_data *pdata,
				    const unsigned char *sha1,
				    uint32_t index_pos);

struct object_entry *packlist_find(struct packing_data *pdata,
				   const unsigned char *sha1,
				   uint32_t *index_pos);

static inline uint32_t pack_name_hash(const char *name)
{
	uint32_t c, hash = 0;

	if (!name)
		return 0;

	/*
	 * This effectively just creates a sortable number from the
	 * last sixteen non-whitespace characters. Last characters
	 * count "most", so things that end in ".c" sort together.
	 */
	while ((c = *name++) != 0) {
		if (isspace(c))
			continue;
		hash = (hash >> 2) + (c << 24);
	}
	return hash;
}

static inline enum object_type oe_type(const struct object_entry *e)
{
	return e->type_valid ? e->type_ : OBJ_BAD;
}

static inline void oe_set_type(struct object_entry *e,
			       enum object_type type)
{
	if (type >= OBJ_ANY)
		BUG("OBJ_ANY cannot be set in pack-objects code");

	e->type_valid = type >= OBJ_NONE;
	e->type_ = (unsigned)type;
}

static inline unsigned int oe_in_pack_pos(const struct packing_data *pack,
					  const struct object_entry *e)
{
	return pack->in_pack_pos[e - pack->objects];
}

static inline void oe_set_in_pack_pos(const struct packing_data *pack,
				      const struct object_entry *e,
				      unsigned int pos)
{
	pack->in_pack_pos[e - pack->objects] = pos;
}

static inline struct packed_git *oe_in_pack(const struct packing_data *pack,
					    const struct object_entry *e)
{
	if (pack->in_pack_by_idx)
		return pack->in_pack_by_idx[e->in_pack_idx];
	else
		return pack->in_pack[e - pack->objects];
}

void oe_map_new_pack(struct packing_data *pack,
		     struct packed_git *p);
static inline void oe_set_in_pack(struct packing_data *pack,
				  struct object_entry *e,
				  struct packed_git *p)
{
	if (!p->index)
		oe_map_new_pack(pack, p);
	if (pack->in_pack_by_idx)
		e->in_pack_idx = p->index;
	else
		pack->in_pack[e - pack->objects] = p;
}

static inline struct object_entry *oe_delta(
		const struct packing_data *pack,
		const struct object_entry *e)
{
	if (e->delta_idx)
		return &pack->objects[e->delta_idx - 1];
	return NULL;
}

static inline void oe_set_delta(struct packing_data *pack,
				struct object_entry *e,
				struct object_entry *delta)
{
	if (delta)
		e->delta_idx = (delta - pack->objects) + 1;
	else
		e->delta_idx = 0;
}

static inline struct object_entry *oe_delta_child(
		const struct packing_data *pack,
		const struct object_entry *e)
{
	if (e->delta_child_idx)
		return &pack->objects[e->delta_child_idx - 1];
	return NULL;
}

static inline void oe_set_delta_child(struct packing_data *pack,
				      struct object_entry *e,
				      struct object_entry *delta)
{
	if (delta)
		e->delta_child_idx = (delta - pack->objects) + 1;
	else
		e->delta_child_idx = 0;
}

static inline struct object_entry *oe_delta_sibling(
		const struct packing_data *pack,
		const struct object_entry *e)
{
	if (e->delta_sibling_idx)
		return &pack->objects[e->delta_sibling_idx - 1];
	return NULL;
}

static inline void oe_set_delta_sibling(struct packing_data *pack,
					struct object_entry *e,
					struct object_entry *delta)
{
	if (delta)
		e->delta_sibling_idx = (delta - pack->objects) + 1;
	else
		e->delta_sibling_idx = 0;
}

unsigned long oe_get_size_slow(struct packing_data *pack,
			       const struct object_entry *e);
static inline unsigned long oe_size(struct packing_data *pack,
				    const struct object_entry *e)
{
	if (e->size_valid)
		return e->size_;

	return oe_get_size_slow(pack, e);
}

static inline int oe_size_less_than(struct packing_data *pack,
				    const struct object_entry *lhs,
				    unsigned long rhs)
{
	if (lhs->size_valid)
		return lhs->size_ < rhs;
	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
		return 0;
	return oe_get_size_slow(pack, lhs) < rhs;
}

static inline int oe_size_greater_than(struct packing_data *pack,
				       const struct object_entry *lhs,
				       unsigned long rhs)
{
	if (lhs->size_valid)
		return lhs->size_ > rhs;
	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
		return 1;
	return oe_get_size_slow(pack, lhs) > rhs;
}

static inline void oe_set_size(struct packing_data *pack,
			       struct object_entry *e,
			       unsigned long size)
{
	if (size < pack->oe_size_limit) {
		e->size_ = size;
		e->size_valid = 1;
	} else {
		e->size_valid = 0;
		if (oe_get_size_slow(pack, e) != size)
			BUG("'size' is supposed to be the object size!");
	}
}

static inline unsigned long oe_delta_size(struct packing_data *pack,
					  const struct object_entry *e)
{
	if (e->delta_size_valid)
		return e->delta_size_;

	/*
	 * pack->detla_size[] can't be NULL because oe_set_delta_size()
	 * must have been called when a new delta is saved with
	 * oe_set_delta().
	 * If oe_delta() returns NULL (i.e. default state, which means
	 * delta_size_valid is also false), then the caller must never
	 * call oe_delta_size().
	 */
	return pack->delta_size[e - pack->objects];
}

static inline void oe_set_delta_size(struct packing_data *pack,
				     struct object_entry *e,
				     unsigned long size)
{
	if (size < pack->oe_delta_size_limit) {
		e->delta_size_ = size;
		e->delta_size_valid = 1;
	} else {
		packing_data_lock(pack);
		if (!pack->delta_size)
			ALLOC_ARRAY(pack->delta_size, pack->nr_alloc);
		packing_data_unlock(pack);

		pack->delta_size[e - pack->objects] = size;
		e->delta_size_valid = 0;
	}
}

#endif
Commit	Line	Data
2834bc27 VM	1	#ifndef PACK_OBJECTS_H
	2	#define PACK_OBJECTS_H
	3
43fa44fa	4	#include "object-store.h"
9ac3f0e5	5	#include "thread-utils.h"
ef3ca954	6	#include "pack.h"
43fa44fa	7
9806f5a7 NTND	8	#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
9806f5a7 NTND	9
0c6804ab	10	#define OE_DFS_STATE_BITS 2
b5c0cbd8	11	#define OE_DEPTH_BITS 12
43fa44fa	12	#define OE_IN_PACK_BITS 10
0cb3c142	13	#define OE_Z_DELTA_BITS 20
ac77d0c3 NTND	14	/*
	15	* Note that oe_set_size() becomes expensive when the given size is
	16	* above this limit. Don't lower it too much.
	17	*/
	18	#define OE_SIZE_BITS 31
9ac3f0e5	19	#define OE_DELTA_SIZE_BITS 23
0c6804ab NTND	20
	21	/*
	22	* State flags for depth-first search used for analyzing delta cycles.
	23	*
	24	* The depth is measured in delta-links to the base (so if A is a delta
	25	* against B, then A has a depth of 1, and B a depth of 0).
	26	*/
	27	enum dfs_state {
	28	DFS_NONE = 0,
	29	DFS_ACTIVE,
	30	DFS_DONE,
	31	DFS_NUM_STATES
	32	};
	33
8d6ccce1	34	/*
3b13a5f2 NTND	35	* The size of struct nearly determines pack-objects's memory
	36	* consumption. This struct is packed tight for that reason. When you
	37	* add or reorder something in this struct, think a bit about this.
	38	*
8d6ccce1 NTND	39	* basic object info
	40	* -----------------
	41	* idx.oid is filled up before delta searching starts. idx.crc32 is
	42	* only valid after the object is written out and will be used for
	43	* generating the index. idx.offset will be both gradually set and
	44	* used in writing phase (base objects get offset first, then deltas
	45	* refer to them)
	46	*
	47	* "size" is the uncompressed object size. Compressed size of the raw
	48	* data for an object in a pack is not stored anywhere but is computed
27a7d067 NTND	49	* and made available when reverse .idx is made. Note that when a
	50	* delta is reused, "size" is the uncompressed _delta_ size, not the
	51	* canonical one after the delta has been applied.
8d6ccce1 NTND	52	*
	53	* "hash" contains a path name hash which is used for sorting the
	54	* delta list and also during delta searching. Once prepare_pack()
	55	* returns it's no longer needed.
	56	*
	57	* source pack info
	58	* ----------------
	59	* The (in_pack, in_pack_offset) tuple contains the location of the
	60	* object in the source pack. in_pack_header_size allows quickly
	61	* skipping the header and going straight to the zlib stream.
	62	*
	63	* "type" and "in_pack_type" both describe object type. in_pack_type
	64	* may contain a delta type, while type is always the canonical type.
	65	*
	66	* deltas
	67	* ------
	68	* Delta links (delta, delta_child and delta_sibling) are created to
	69	* reflect that delta graph from the source pack then updated or added
	70	* during delta searching phase when we find better deltas.
	71	*
	72	* delta_child and delta_sibling are last needed in
	73	* compute_write_order(). "delta" and "delta_size" must remain valid
	74	* at object writing phase in case the delta is not cached.
	75	*
	76	* If a delta is cached in memory and is compressed, delta_data points
	77	* to the data and z_delta_size contains the compressed size. If it's
	78	* uncompressed [1], z_delta_size must be zero. delta_size is always
	79	* the uncompressed size and must be valid even if the delta is not
	80	* cached.
	81	*
	82	* [1] during try_delta phase we don't bother with compressing because
	83	* the delta could be quickly replaced with a better one.
	84	*/
2834bc27 VM	85	struct object_entry {
2834bc27 VM	86	struct pack_idx_entry idx;
2834bc27	87	void delta_data; / cached delta (uncompressed) */
3b13a5f2	88	off_t in_pack_offset;
2834bc27	89	uint32_t hash; /* name hint hash */
ac77d0c3 NTND	90	unsigned size_:OE_SIZE_BITS;
ac77d0c3 NTND	91	unsigned size_valid:1;
898eba5e NTND	92	uint32_t delta_idx; /* delta base object */
	93	uint32_t delta_child_idx; /* deltified objects who bases me */
	94	uint32_t delta_sibling_idx; /* other deltified objects who
	95	* uses the same base as me
	96	*/
0aca34e8 NTND	97	unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
0aca34e8 NTND	98	unsigned delta_size_valid:1;
9ac3f0e5	99	unsigned char in_pack_header_size;
3b13a5f2	100	unsigned in_pack_idx:OE_IN_PACK_BITS; /* already in pack */
0cb3c142	101	unsigned z_delta_size:OE_Z_DELTA_BITS;
3b13a5f2	102	unsigned type_valid:1;
3b13a5f2	103	unsigned no_try_delta:1;
9ac3f0e5	104	unsigned type_:TYPE_BITS;
fd9b1bae	105	unsigned in_pack_type:TYPE_BITS; /* could be delta */
2834bc27 VM	106	unsigned preferred_base:1; /*
	107	* we do not pack this, but is available
	108	* to be used as the base object to delta
	109	* objects against.
	110	*/
2834bc27 VM	111	unsigned tagged:1; /* near the very tip of refs */
2834bc27 VM	112	unsigned filled:1; /* assigned write-order */
0c6804ab	113	unsigned dfs_state:OE_DFS_STATE_BITS;
b5c0cbd8	114	unsigned depth:OE_DEPTH_BITS;
4cf2143e JK	115
4cf2143e JK	116	/*
3b13a5f2	117	* pahole results on 64-bit linux (gcc and clang)
7dbabbbe	118	*
9ac3f0e5	119	* size: 80, bit_padding: 9 bits
3b13a5f2 NTND	120	*
	121	* and on 32-bit (gcc)
	122	*
9ac3f0e5	123	* size: 76, bit_padding: 9 bits
4cf2143e	124	*/
2834bc27 VM	125	};
	126
	127	struct packing_data {
	128	struct object_entry *objects;
	129	uint32_t nr_objects, nr_alloc;
	130
	131	int32_t *index;
	132	uint32_t index_size;
06af3bba NTND	133
06af3bba NTND	134	unsigned int *in_pack_pos;
9ac3f0e5	135	unsigned long *delta_size;
43fa44fa NTND	136
	137	/*
	138	* Only one of these can be non-NULL and they have different
	139	* sizes. if in_pack_by_idx is allocated, oe_in_pack() returns
	140	* the pack of an object using in_pack_idx field. If not,
	141	* in_pack[] array is used the same way as in_pack_pos[]
	142	*/
	143	struct packed_git **in_pack_by_idx;
	144	struct packed_git **in_pack;
ac77d0c3	145
9ac3f0e5 NTND	146	#ifndef NO_PTHREADS
	147	pthread_mutex_t lock;
	148	#endif
	149
ac77d0c3	150	uintmax_t oe_size_limit;
9ac3f0e5	151	uintmax_t oe_delta_size_limit;
2834bc27 VM	152	};
2834bc27 VM	153
43fa44fa	154	void prepare_packing_data(struct packing_data *pdata);
9ac3f0e5 NTND	155
	156	static inline void packing_data_lock(struct packing_data *pdata)
	157	{
	158	#ifndef NO_PTHREADS
	159	pthread_mutex_lock(&pdata->lock);
	160	#endif
	161	}
	162	static inline void packing_data_unlock(struct packing_data *pdata)
	163	{
	164	#ifndef NO_PTHREADS
	165	pthread_mutex_unlock(&pdata->lock);
	166	#endif
	167	}
	168
2834bc27 VM	169	struct object_entry packlist_alloc(struct packing_data pdata,
	170	const unsigned char *sha1,
	171	uint32_t index_pos);
	172
	173	struct object_entry packlist_find(struct packing_data pdata,
	174	const unsigned char *sha1,
	175	uint32_t *index_pos);
	176
68fb36eb VM	177	static inline uint32_t pack_name_hash(const char *name)
	178	{
	179	uint32_t c, hash = 0;
	180
	181	if (!name)
	182	return 0;
	183
	184	/*
	185	* This effectively just creates a sortable number from the
	186	* last sixteen non-whitespace characters. Last characters
	187	* count "most", so things that end in ".c" sort together.
	188	*/
	189	while ((c = *name++) != 0) {
	190	if (isspace(c))
	191	continue;
	192	hash = (hash >> 2) + (c << 24);
	193	}
	194	return hash;
	195	}
	196
fd9b1bae NTND	197	static inline enum object_type oe_type(const struct object_entry *e)
	198	{
	199	return e->type_valid ? e->type_ : OBJ_BAD;
	200	}
	201
	202	static inline void oe_set_type(struct object_entry *e,
	203	enum object_type type)
	204	{
	205	if (type >= OBJ_ANY)
	206	BUG("OBJ_ANY cannot be set in pack-objects code");
	207
	208	e->type_valid = type >= OBJ_NONE;
	209	e->type_ = (unsigned)type;
	210	}
	211
06af3bba NTND	212	static inline unsigned int oe_in_pack_pos(const struct packing_data *pack,
	213	const struct object_entry *e)
	214	{
	215	return pack->in_pack_pos[e - pack->objects];
	216	}
	217
	218	static inline void oe_set_in_pack_pos(const struct packing_data *pack,
	219	const struct object_entry *e,
	220	unsigned int pos)
	221	{
	222	pack->in_pack_pos[e - pack->objects] = pos;
	223	}
	224
43fa44fa NTND	225	static inline struct packed_git oe_in_pack(const struct packing_data pack,
	226	const struct object_entry *e)
	227	{
	228	if (pack->in_pack_by_idx)
	229	return pack->in_pack_by_idx[e->in_pack_idx];
	230	else
	231	return pack->in_pack[e - pack->objects];
	232	}
	233
	234	void oe_map_new_pack(struct packing_data *pack,
	235	struct packed_git *p);
	236	static inline void oe_set_in_pack(struct packing_data *pack,
	237	struct object_entry *e,
	238	struct packed_git *p)
	239	{
	240	if (!p->index)
	241	oe_map_new_pack(pack, p);
	242	if (pack->in_pack_by_idx)
	243	e->in_pack_idx = p->index;
	244	else
	245	pack->in_pack[e - pack->objects] = p;
	246	}
	247
898eba5e NTND	248	static inline struct object_entry *oe_delta(
	249	const struct packing_data *pack,
	250	const struct object_entry *e)
	251	{
	252	if (e->delta_idx)
	253	return &pack->objects[e->delta_idx - 1];
	254	return NULL;
	255	}
	256
	257	static inline void oe_set_delta(struct packing_data *pack,
	258	struct object_entry *e,
	259	struct object_entry *delta)
	260	{
	261	if (delta)
	262	e->delta_idx = (delta - pack->objects) + 1;
	263	else
	264	e->delta_idx = 0;
	265	}
	266
	267	static inline struct object_entry *oe_delta_child(
	268	const struct packing_data *pack,
	269	const struct object_entry *e)
	270	{
	271	if (e->delta_child_idx)
	272	return &pack->objects[e->delta_child_idx - 1];
	273	return NULL;
	274	}
	275
	276	static inline void oe_set_delta_child(struct packing_data *pack,
	277	struct object_entry *e,
	278	struct object_entry *delta)
	279	{
	280	if (delta)
	281	e->delta_child_idx = (delta - pack->objects) + 1;
	282	else
	283	e->delta_child_idx = 0;
	284	}
	285
	286	static inline struct object_entry *oe_delta_sibling(
	287	const struct packing_data *pack,
	288	const struct object_entry *e)
	289	{
	290	if (e->delta_sibling_idx)
	291	return &pack->objects[e->delta_sibling_idx - 1];
	292	return NULL;
	293	}
	294
	295	static inline void oe_set_delta_sibling(struct packing_data *pack,
	296	struct object_entry *e,
	297	struct object_entry *delta)
	298	{
	299	if (delta)
	300	e->delta_sibling_idx = (delta - pack->objects) + 1;
	301	else
	302	e->delta_sibling_idx = 0;
	303	}
	304
ac77d0c3 NTND	305	unsigned long oe_get_size_slow(struct packing_data *pack,
	306	const struct object_entry *e);
	307	static inline unsigned long oe_size(struct packing_data *pack,
	308	const struct object_entry *e)
	309	{
	310	if (e->size_valid)
	311	return e->size_;
	312
	313	return oe_get_size_slow(pack, e);
	314	}
	315
	316	static inline int oe_size_less_than(struct packing_data *pack,
	317	const struct object_entry *lhs,
	318	unsigned long rhs)
	319	{
	320	if (lhs->size_valid)
	321	return lhs->size_ < rhs;
	322	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
	323	return 0;
	324	return oe_get_size_slow(pack, lhs) < rhs;
	325	}
	326
	327	static inline int oe_size_greater_than(struct packing_data *pack,
	328	const struct object_entry *lhs,
	329	unsigned long rhs)
	330	{
	331	if (lhs->size_valid)
	332	return lhs->size_ > rhs;
	333	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
	334	return 1;
	335	return oe_get_size_slow(pack, lhs) > rhs;
	336	}
	337
	338	static inline void oe_set_size(struct packing_data *pack,
	339	struct object_entry *e,
	340	unsigned long size)
	341	{
	342	if (size < pack->oe_size_limit) {
	343	e->size_ = size;
	344	e->size_valid = 1;
	345	} else {
	346	e->size_valid = 0;
	347	if (oe_get_size_slow(pack, e) != size)
	348	BUG("'size' is supposed to be the object size!");
	349	}
	350	}
	351
0aca34e8 NTND	352	static inline unsigned long oe_delta_size(struct packing_data *pack,
	353	const struct object_entry *e)
	354	{
	355	if (e->delta_size_valid)
	356	return e->delta_size_;
9ac3f0e5 NTND	357
	358	/*
	359	* pack->detla_size[] can't be NULL because oe_set_delta_size()
	360	* must have been called when a new delta is saved with
	361	* oe_set_delta().
	362	* If oe_delta() returns NULL (i.e. default state, which means
	363	* delta_size_valid is also false), then the caller must never
	364	* call oe_delta_size().
	365	*/
	366	return pack->delta_size[e - pack->objects];
0aca34e8 NTND	367	}
	368
	369	static inline void oe_set_delta_size(struct packing_data *pack,
	370	struct object_entry *e,
	371	unsigned long size)
	372	{
9ac3f0e5 NTND	373	if (size < pack->oe_delta_size_limit) {
	374	e->delta_size_ = size;
	375	e->delta_size_valid = 1;
	376	} else {
	377	packing_data_lock(pack);
	378	if (!pack->delta_size)
	379	ALLOC_ARRAY(pack->delta_size, pack->nr_alloc);
	380	packing_data_unlock(pack);
	381
	382	pack->delta_size[e - pack->objects] = size;
	383	e->delta_size_valid = 0;
	384	}
0aca34e8 NTND	385	}
0aca34e8 NTND	386
2834bc27	387	#endif