xfs_bmap.h 9.9 KB
Newer Older
L
Linus Torvalds 已提交
1
/*
2
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3
 * All Rights Reserved.
L
Linus Torvalds 已提交
4
 *
5 6
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
L
Linus Torvalds 已提交
7 8
 * published by the Free Software Foundation.
 *
9 10 11 12
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
L
Linus Torvalds 已提交
13
 *
14 15 16
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
L
Linus Torvalds 已提交
17 18 19 20 21 22
 */
#ifndef __XFS_BMAP_H__
#define	__XFS_BMAP_H__

struct getbmap;
struct xfs_bmbt_irec;
23
struct xfs_ifork;
L
Linus Torvalds 已提交
24 25 26 27
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;

D
David Chinner 已提交
28 29
extern kmem_zone_t	*xfs_bmap_free_item_zone;

30 31 32 33 34
/*
 * Argument structure for xfs_bmap_alloc.
 */
struct xfs_bmalloca {
	xfs_fsblock_t		*firstblock; /* i/o first block allocated */
35
	struct xfs_defer_ops	*dfops;	/* bmap freelist */
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
	struct xfs_trans	*tp;	/* transaction pointer */
	struct xfs_inode	*ip;	/* incore inode pointer */
	struct xfs_bmbt_irec	prev;	/* extent before the new one */
	struct xfs_bmbt_irec	got;	/* extent after, or delayed */

	xfs_fileoff_t		offset;	/* offset in file filling in */
	xfs_extlen_t		length;	/* i/o length asked/allocated */
	xfs_fsblock_t		blkno;	/* starting block of new extent */

	struct xfs_btree_cur	*cur;	/* btree cursor */
	xfs_extnum_t		idx;	/* current extent index */
	int			nallocs;/* number of extents alloc'd */
	int			logflags;/* flags for transaction logging */

	xfs_extlen_t		total;	/* total blocks needed for xaction */
	xfs_extlen_t		minlen;	/* minimum allocation size (blocks) */
	xfs_extlen_t		minleft; /* amount must be left after alloc */
	bool			eof;	/* set if allocating past last extent */
	bool			wasdel;	/* replacing a delayed allocation */
	bool			aeof;	/* allocated space at eof */
	bool			conv;	/* overwriting unwritten extents */
57
	int			datatype;/* data type being allocated */
58 59 60
	int			flags;
};

L
Linus Torvalds 已提交
61 62 63 64
/*
 * List of extents to be free "later".
 * The list is kept sorted on xbf_startblock.
 */
65
struct xfs_extent_free_item
L
Linus Torvalds 已提交
66
{
67 68 69
	xfs_fsblock_t		xefi_startblock;/* starting fs block number */
	xfs_extlen_t		xefi_blockcount;/* number of blocks in extent */
	struct list_head	xefi_list;
70
	struct xfs_owner_info	xefi_oinfo;	/* extent owner */
71
};
L
Linus Torvalds 已提交
72 73 74 75

#define	XFS_BMAP_MAX_NMAP	4

/*
76
 * Flags for xfs_bmapi_*
L
Linus Torvalds 已提交
77
 */
78 79 80 81 82
#define XFS_BMAPI_ENTIRE	0x001	/* return entire extent, not trimmed */
#define XFS_BMAPI_METADATA	0x002	/* mapping metadata not user data */
#define XFS_BMAPI_ATTRFORK	0x004	/* use attribute fork not data */
#define XFS_BMAPI_PREALLOC	0x008	/* preallocation op: unwritten space */
#define XFS_BMAPI_IGSTATE	0x010	/* Ignore state - */
L
Linus Torvalds 已提交
83
					/* combine contig. space */
84
#define XFS_BMAPI_CONTIG	0x020	/* must allocate only one extent */
D
Dave Chinner 已提交
85 86 87 88 89
/*
 * unwritten extent conversion - this needs write cache flushing and no additional
 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
 * from written to unwritten, otherwise convert from unwritten to written.
 */
90
#define XFS_BMAPI_CONVERT	0x040
L
Linus Torvalds 已提交
91

92 93 94 95 96 97 98 99
/*
 * allocate zeroed extents - this requires all newly allocated user data extents
 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
 * during the allocation range to zeroed written extents.
 */
#define XFS_BMAPI_ZERO		0x080

100 101 102 103
/*
 * Map the inode offset to the block given in ap->firstblock.  Primarily
 * used for reflink.  The range must be in a hole, and this flag cannot be
 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
104 105 106
 *
 * For bunmapi, this flag unmaps the range without adjusting quota, reducing
 * refcount, or freeing the blocks.
107 108 109
 */
#define XFS_BMAPI_REMAP		0x100

D
Darrick J. Wong 已提交
110 111 112
/* Map something in the CoW fork. */
#define XFS_BMAPI_COWFORK	0x200

C
Christoph Hellwig 已提交
113 114 115
/* Only convert delalloc space, don't allocate entirely new extents */
#define XFS_BMAPI_DELALLOC	0x400

C
Christoph Hellwig 已提交
116 117 118 119 120 121 122
#define XFS_BMAPI_FLAGS \
	{ XFS_BMAPI_ENTIRE,	"ENTIRE" }, \
	{ XFS_BMAPI_METADATA,	"METADATA" }, \
	{ XFS_BMAPI_ATTRFORK,	"ATTRFORK" }, \
	{ XFS_BMAPI_PREALLOC,	"PREALLOC" }, \
	{ XFS_BMAPI_IGSTATE,	"IGSTATE" }, \
	{ XFS_BMAPI_CONTIG,	"CONTIG" }, \
123
	{ XFS_BMAPI_CONVERT,	"CONVERT" }, \
124
	{ XFS_BMAPI_ZERO,	"ZERO" }, \
D
Darrick J. Wong 已提交
125
	{ XFS_BMAPI_REMAP,	"REMAP" }, \
C
Christoph Hellwig 已提交
126 127
	{ XFS_BMAPI_COWFORK,	"COWFORK" }, \
	{ XFS_BMAPI_DELALLOC,	"DELALLOC" }
C
Christoph Hellwig 已提交
128 129


130 131
static inline int xfs_bmapi_aflag(int w)
{
D
Darrick J. Wong 已提交
132 133 134 135 136 137 138 139 140 141 142
	return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
	       (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
}

static inline int xfs_bmapi_whichfork(int bmapi_flags)
{
	if (bmapi_flags & XFS_BMAPI_COWFORK)
		return XFS_COW_FORK;
	else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
		return XFS_ATTR_FORK;
	return XFS_DATA_FORK;
143
}
L
Linus Torvalds 已提交
144 145 146 147 148 149 150

/*
 * Special values for xfs_bmbt_irec_t br_startblock field.
 */
#define	DELAYSTARTBLOCK		((xfs_fsblock_t)-1LL)
#define	HOLESTARTBLOCK		((xfs_fsblock_t)-2LL)

151 152 153 154 155 156 157 158 159 160 161
/*
 * Flags for xfs_bmap_add_extent*.
 */
#define BMAP_LEFT_CONTIG	(1 << 0)
#define BMAP_RIGHT_CONTIG	(1 << 1)
#define BMAP_LEFT_FILLING	(1 << 2)
#define BMAP_RIGHT_FILLING	(1 << 3)
#define BMAP_LEFT_DELAY		(1 << 4)
#define BMAP_RIGHT_DELAY	(1 << 5)
#define BMAP_LEFT_VALID		(1 << 6)
#define BMAP_RIGHT_VALID	(1 << 7)
162
#define BMAP_ATTRFORK		(1 << 8)
D
Darrick J. Wong 已提交
163
#define BMAP_COWFORK		(1 << 9)
164

C
Christoph Hellwig 已提交
165 166 167 168 169
#define XFS_BMAP_EXT_FLAGS \
	{ BMAP_LEFT_CONTIG,	"LC" }, \
	{ BMAP_RIGHT_CONTIG,	"RC" }, \
	{ BMAP_LEFT_FILLING,	"LF" }, \
	{ BMAP_RIGHT_FILLING,	"RF" }, \
D
Darrick J. Wong 已提交
170 171
	{ BMAP_ATTRFORK,	"ATTR" }, \
	{ BMAP_COWFORK,		"COW" }
L
Linus Torvalds 已提交
172

173

174 175 176 177 178 179 180 181 182 183 184 185
/*
 * Return true if the extent is a real, allocated extent, or false if it is  a
 * delayed allocation, and unwritten extent or a hole.
 */
static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
{
	return irec->br_state != XFS_EXT_UNWRITTEN &&
		irec->br_startblock != HOLESTARTBLOCK &&
		irec->br_startblock != DELAYSTARTBLOCK &&
		!isnullstartblock(irec->br_startblock);
}

186 187 188 189 190 191 192 193 194
/*
 * This macro is used to determine how many extents will be shifted
 * in one write transaction. We could require two splits,
 * an extent move on the first and an extent merge on the second,
 * So it is proper that one extent is shifted inside write transaction
 * at a time.
 */
#define XFS_BMAP_MAX_SHIFT_EXTENTS	1

195 196 197 198 199
enum shift_direction {
	SHIFT_LEFT = 0,
	SHIFT_RIGHT,
};

200
#ifdef DEBUG
C
Christoph Hellwig 已提交
201 202
void	xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
		int whichfork, unsigned long caller_ip);
203
#define	XFS_BMAP_TRACE_EXLIST(ip,c,w)	\
C
Christoph Hellwig 已提交
204 205
	xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_)
#else
206
#define	XFS_BMAP_TRACE_EXLIST(ip,c,w)
C
Christoph Hellwig 已提交
207
#endif
L
Linus Torvalds 已提交
208

D
Darrick J. Wong 已提交
209 210
void	xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
		xfs_filblks_t len);
C
Christoph Hellwig 已提交
211
int	xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
212
void	xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
213
void	xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
214 215
			  xfs_fsblock_t bno, xfs_filblks_t len,
			  struct xfs_owner_info *oinfo);
C
Christoph Hellwig 已提交
216 217 218 219 220
void	xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
int	xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
		xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
int	xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
		xfs_fileoff_t *last_block, int whichfork);
221 222
int	xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
		int whichfork);
C
Christoph Hellwig 已提交
223 224 225
int	xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
int	xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
		int whichfork);
D
Dave Chinner 已提交
226 227 228
int	xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
		xfs_filblks_t len, struct xfs_bmbt_irec *mval,
		int *nmap, int flags);
229 230 231 232
int	xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
		xfs_fileoff_t bno, xfs_filblks_t len, int flags,
		xfs_fsblock_t *firstblock, xfs_extlen_t total,
		struct xfs_bmbt_irec *mval, int *nmap,
233
		struct xfs_defer_ops *dfops);
234 235 236 237
int	__xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
		xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags,
		xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
		struct xfs_defer_ops *dfops);
C
Christoph Hellwig 已提交
238 239 240
int	xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
		xfs_fileoff_t bno, xfs_filblks_t len, int flags,
		xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
241
		struct xfs_defer_ops *dfops, int *done);
C
Christoph Hellwig 已提交
242 243 244 245 246
int	xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
		xfs_extnum_t *idx, struct xfs_bmbt_irec *got,
		struct xfs_bmbt_irec *del);
void	xfs_bmap_del_extent_cow(struct xfs_inode *ip, xfs_extnum_t *idx,
		struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del);
C
Christoph Hellwig 已提交
247 248 249
int	xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx,
		xfs_extnum_t num);
uint	xfs_default_attroffset(struct xfs_inode *ip);
250
int	xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
251 252
		xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
		int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock,
253
		struct xfs_defer_ops *dfops, enum shift_direction direction,
254 255
		int num_exts);
int	xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
256
int	xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
257
		xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
258
		struct xfs_bmbt_irec *got, xfs_extnum_t *lastx, int eof);
C
Christoph Hellwig 已提交
259

D
Darrick J. Wong 已提交
260 261 262 263 264 265 266 267 268 269 270 271 272
enum xfs_bmap_intent_type {
	XFS_BMAP_MAP = 1,
	XFS_BMAP_UNMAP,
};

struct xfs_bmap_intent {
	struct list_head			bi_list;
	enum xfs_bmap_intent_type		bi_type;
	struct xfs_inode			*bi_owner;
	int					bi_whichfork;
	struct xfs_bmbt_irec			bi_bmap;
};

273 274 275 276 277 278 279 280 281
int	xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops,
		struct xfs_inode *ip, enum xfs_bmap_intent_type type,
		int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock,
		xfs_filblks_t blockcount, xfs_exntst_t state);
int	xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
int	xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
		struct xfs_inode *ip, struct xfs_bmbt_irec *imap);

L
Linus Torvalds 已提交
282
#endif	/* __XFS_BMAP_H__ */