1/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18#ifndef __XFS_BMAP_H__
19#define	__XFS_BMAP_H__
20
21struct getbmap;
22struct xfs_bmbt_irec;
23struct xfs_ifork;
24struct xfs_inode;
25struct xfs_mount;
26struct xfs_trans;
27
28/*
29 * DELTA: describe a change to the in-core extent list.
30 *
31 * Internally the use of xed_blockount is somewhat funky.
32 * xed_blockcount contains an offset much of the time because this
33 * makes merging changes easier.  (xfs_fileoff_t and xfs_filblks_t are
34 * the same underlying type).
35 */
36typedef struct xfs_extdelta
37{
38	xfs_fileoff_t		xed_startoff;	/* offset of range */
39	xfs_filblks_t		xed_blockcount;	/* blocks in range */
40} xfs_extdelta_t;
41
42/*
43 * List of extents to be free "later".
44 * The list is kept sorted on xbf_startblock.
45 */
46typedef struct xfs_bmap_free_item
47{
48	xfs_fsblock_t		xbfi_startblock;/* starting fs block number */
49	xfs_extlen_t		xbfi_blockcount;/* number of blocks in extent */
50	struct xfs_bmap_free_item *xbfi_next;	/* link to next entry */
51} xfs_bmap_free_item_t;
52
53/*
54 * Header for free extent list.
55 */
56typedef	struct xfs_bmap_free
57{
58	xfs_bmap_free_item_t	*xbf_first;	/* list of to-be-free extents */
59	int			xbf_count;	/* count of items on list */
60	int			xbf_low;	/* kludge: alloc in low mode */
61} xfs_bmap_free_t;
62
63#define	XFS_BMAP_MAX_NMAP	4
64
65/*
66 * Flags for xfs_bmapi
67 */
68#define	XFS_BMAPI_WRITE		0x001	/* write operation: allocate space */
69#define XFS_BMAPI_DELAY		0x002	/* delayed write operation */
70#define XFS_BMAPI_ENTIRE	0x004	/* return entire extent, not trimmed */
71#define XFS_BMAPI_METADATA	0x008	/* mapping metadata not user data */
72#define XFS_BMAPI_EXACT		0x010	/* allocate only to spec'd bounds */
73#define XFS_BMAPI_ATTRFORK	0x020	/* use attribute fork not data */
74#define XFS_BMAPI_ASYNC		0x040	/* bunmapi xactions can be async */
75#define XFS_BMAPI_RSVBLOCKS	0x080	/* OK to alloc. reserved data blocks */
76#define	XFS_BMAPI_PREALLOC	0x100	/* preallocation op: unwritten space */
77#define	XFS_BMAPI_IGSTATE	0x200	/* Ignore state - */
78					/* combine contig. space */
79#define	XFS_BMAPI_CONTIG	0x400	/* must allocate only one extent */
80/*	XFS_BMAPI_DIRECT_IO	0x800	*/
81#define XFS_BMAPI_CONVERT	0x1000	/* unwritten extent conversion - */
82					/* need write cache flushing and no */
83					/* additional allocation alignments */
84
85#define	XFS_BMAPI_AFLAG(w)	xfs_bmapi_aflag(w)
86static inline int xfs_bmapi_aflag(int w)
87{
88	return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
89}
90
91/*
92 * Special values for xfs_bmbt_irec_t br_startblock field.
93 */
94#define	DELAYSTARTBLOCK		((xfs_fsblock_t)-1LL)
95#define	HOLESTARTBLOCK		((xfs_fsblock_t)-2LL)
96
97#define	XFS_BMAP_INIT(flp,fbp)	xfs_bmap_init(flp,fbp)
98static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
99{
100	((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \
101		(flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK);
102}
103
104/*
105 * Argument structure for xfs_bmap_alloc.
106 */
107typedef struct xfs_bmalloca {
108	xfs_fsblock_t		firstblock; /* i/o first block allocated */
109	xfs_fsblock_t		rval;	/* starting block of new extent */
110	xfs_fileoff_t		off;	/* offset in file filling in */
111	struct xfs_trans	*tp;	/* transaction pointer */
112	struct xfs_inode	*ip;	/* incore inode pointer */
113	struct xfs_bmbt_irec	*prevp;	/* extent before the new one */
114	struct xfs_bmbt_irec	*gotp;	/* extent after, or delayed */
115	xfs_extlen_t		alen;	/* i/o length asked/allocated */
116	xfs_extlen_t		total;	/* total blocks needed for xaction */
117	xfs_extlen_t		minlen;	/* mininum allocation size (blocks) */
118	xfs_extlen_t		minleft; /* amount must be left after alloc */
119	char			eof;	/* set if allocating past last extent */
120	char			wasdel;	/* replacing a delayed allocation */
121	char			userdata;/* set if is user data */
122	char			low;	/* low on space, using seq'l ags */
123	char			aeof;	/* allocated space at eof */
124	char			conv;	/* overwriting unwritten extents */
125} xfs_bmalloca_t;
126
127#ifdef __KERNEL__
128
129#if defined(XFS_BMAP_TRACE)
130/*
131 * Trace operations for bmap extent tracing
132 */
133#define	XFS_BMAP_KTRACE_DELETE	1
134#define	XFS_BMAP_KTRACE_INSERT	2
135#define	XFS_BMAP_KTRACE_PRE_UP	3
136#define	XFS_BMAP_KTRACE_POST_UP	4
137
138#define	XFS_BMAP_TRACE_SIZE	4096	/* size of global trace buffer */
139#define	XFS_BMAP_KTRACE_SIZE	32	/* size of per-inode trace buffer */
140extern ktrace_t	*xfs_bmap_trace_buf;
141
142/*
143 * Add bmap trace insert entries for all the contents of the extent list.
144 */
145void
146xfs_bmap_trace_exlist(
147	char			*fname,		/* function name */
148	struct xfs_inode	*ip,		/* incore inode pointer */
149	xfs_extnum_t		cnt,		/* count of entries in list */
150	int			whichfork);	/* data or attr fork */
151#else
152#define	xfs_bmap_trace_exlist(f,ip,c,w)
153#endif
154
155/*
156 * Convert inode from non-attributed to attributed.
157 * Must not be in a transaction, ip must not be locked.
158 */
159int					/* error code */
160xfs_bmap_add_attrfork(
161	struct xfs_inode	*ip,	/* incore inode pointer */
162	int			size,	/* space needed for new attribute */
163	int			rsvd);	/* flag for reserved block allocation */
164
165/*
166 * Add the extent to the list of extents to be free at transaction end.
167 * The list is maintained sorted (by block number).
168 */
169void
170xfs_bmap_add_free(
171	xfs_fsblock_t		bno,		/* fs block number of extent */
172	xfs_filblks_t		len,		/* length of extent */
173	xfs_bmap_free_t		*flist,		/* list of extents */
174	struct xfs_mount	*mp);		/* mount point structure */
175
176/*
177 * Routine to clean up the free list data structure when
178 * an error occurs during a transaction.
179 */
180void
181xfs_bmap_cancel(
182	xfs_bmap_free_t		*flist);	/* free list to clean up */
183
184/*
185 * Compute and fill in the value of the maximum depth of a bmap btree
186 * in this filesystem.  Done once, during mount.
187 */
188void
189xfs_bmap_compute_maxlevels(
190	struct xfs_mount	*mp,	/* file system mount structure */
191	int			whichfork);	/* data or attr fork */
192
193/*
194 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
195 * caller.  Frees all the extents that need freeing, which must be done
196 * last due to locking considerations.
197 *
198 * Return 1 if the given transaction was committed and a new one allocated,
199 * and 0 otherwise.
200 */
201int						/* error */
202xfs_bmap_finish(
203	struct xfs_trans	**tp,		/* transaction pointer addr */
204	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
205	xfs_fsblock_t		firstblock,	/* controlled a.g. for allocs */
206	int			*committed);	/* xact committed or not */
207
208/*
209 * Returns the file-relative block number of the first unused block in the file.
210 * This is the lowest-address hole if the file has holes, else the first block
211 * past the end of file.
212 */
213int						/* error */
214xfs_bmap_first_unused(
215	struct xfs_trans	*tp,		/* transaction pointer */
216	struct xfs_inode	*ip,		/* incore inode */
217	xfs_extlen_t		len,		/* size of hole to find */
218	xfs_fileoff_t		*unused,	/* unused block num */
219	int			whichfork);	/* data or attr fork */
220
221/*
222 * Returns the file-relative block number of the last block + 1 before
223 * last_block (input value) in the file.
224 * This is not based on i_size, it is based on the extent list.
225 * Returns 0 for local files, as they do not have an extent list.
226 */
227int						/* error */
228xfs_bmap_last_before(
229	struct xfs_trans	*tp,		/* transaction pointer */
230	struct xfs_inode	*ip,		/* incore inode */
231	xfs_fileoff_t		*last_block,	/* last block */
232	int			whichfork);	/* data or attr fork */
233
234/*
235 * Returns the file-relative block number of the first block past eof in
236 * the file.  This is not based on i_size, it is based on the extent list.
237 * Returns 0 for local files, as they do not have an extent list.
238 */
239int						/* error */
240xfs_bmap_last_offset(
241	struct xfs_trans	*tp,		/* transaction pointer */
242	struct xfs_inode	*ip,		/* incore inode */
243	xfs_fileoff_t		*unused,	/* last block num */
244	int			whichfork);	/* data or attr fork */
245
246/*
247 * Returns whether the selected fork of the inode has exactly one
248 * block or not.  For the data fork we check this matches di_size,
249 * implying the file's range is 0..bsize-1.
250 */
251int
252xfs_bmap_one_block(
253	struct xfs_inode	*ip,		/* incore inode */
254	int			whichfork);	/* data or attr fork */
255
256/*
257 * Read in the extents to iu_extents.
258 * All inode fields are set up by caller, we just traverse the btree
259 * and copy the records in.
260 */
261int						/* error */
262xfs_bmap_read_extents(
263	struct xfs_trans	*tp,		/* transaction pointer */
264	struct xfs_inode	*ip,		/* incore inode */
265	int			whichfork);	/* data or attr fork */
266
267/*
268 * Map file blocks to filesystem blocks.
269 * File range is given by the bno/len pair.
270 * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
271 * into a hole or past eof.
272 * Only allocates blocks from a single allocation group,
273 * to avoid locking problems.
274 * The returned value in "firstblock" from the first call in a transaction
275 * must be remembered and presented to subsequent calls in "firstblock".
276 * An upper bound for the number of blocks to be allocated is supplied to
277 * the first call in "total"; if no allocation group has that many free
278 * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
279 */
280int						/* error */
281xfs_bmapi(
282	struct xfs_trans	*tp,		/* transaction pointer */
283	struct xfs_inode	*ip,		/* incore inode */
284	xfs_fileoff_t		bno,		/* starting file offs. mapped */
285	xfs_filblks_t		len,		/* length to map in file */
286	int			flags,		/* XFS_BMAPI_... */
287	xfs_fsblock_t		*firstblock,	/* first allocated block
288						   controls a.g. for allocs */
289	xfs_extlen_t		total,		/* total blocks needed */
290	struct xfs_bmbt_irec	*mval,		/* output: map values */
291	int			*nmap,		/* i/o: mval size/count */
292	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
293	xfs_extdelta_t		*delta);	/* o: change made to incore
294						   extents */
295
296/*
297 * Map file blocks to filesystem blocks, simple version.
298 * One block only, read-only.
299 * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
300 * For the other flag values, the effect is as if XFS_BMAPI_METADATA
301 * was set and all the others were clear.
302 */
303int						/* error */
304xfs_bmapi_single(
305	struct xfs_trans	*tp,		/* transaction pointer */
306	struct xfs_inode	*ip,		/* incore inode */
307	int			whichfork,	/* data or attr fork */
308	xfs_fsblock_t		*fsb,		/* output: mapped block */
309	xfs_fileoff_t		bno);		/* starting file offs. mapped */
310
311/*
312 * Unmap (remove) blocks from a file.
313 * If nexts is nonzero then the number of extents to remove is limited to
314 * that value.  If not all extents in the block range can be removed then
315 * *done is set.
316 */
317int						/* error */
318xfs_bunmapi(
319	struct xfs_trans	*tp,		/* transaction pointer */
320	struct xfs_inode	*ip,		/* incore inode */
321	xfs_fileoff_t		bno,		/* starting offset to unmap */
322	xfs_filblks_t		len,		/* length to unmap in file */
323	int			flags,		/* XFS_BMAPI_... */
324	xfs_extnum_t		nexts,		/* number of extents max */
325	xfs_fsblock_t		*firstblock,	/* first allocated block
326						   controls a.g. for allocs */
327	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
328	xfs_extdelta_t		*delta,		/* o: change made to incore
329						   extents */
330	int			*done);		/* set if not done yet */
331
332/*
333 * Fcntl interface to xfs_bmapi.
334 */
335int						/* error code */
336xfs_getbmap(
337	bhv_desc_t		*bdp,		/* XFS behavior descriptor*/
338	struct getbmap		*bmv,		/* user bmap structure */
339	void			__user *ap,	/* pointer to user's array */
340	int			iflags);	/* interface flags */
341
342/*
343 * Check if the endoff is outside the last extent. If so the caller will grow
344 * the allocation to a stripe unit boundary
345 */
346int
347xfs_bmap_eof(
348	struct xfs_inode        *ip,
349	xfs_fileoff_t           endoff,
350	int                     whichfork,
351	int                     *eof);
352
353/*
354 * Count fsblocks of the given fork.
355 */
356int
357xfs_bmap_count_blocks(
358	xfs_trans_t		*tp,
359	struct xfs_inode	*ip,
360	int			whichfork,
361	int			*count);
362
363/*
364 * Check an extent list, which has just been read, for
365 * any bit in the extent flag field.
366 */
367int
368xfs_check_nostate_extents(
369	struct xfs_ifork	*ifp,
370	xfs_extnum_t		idx,
371	xfs_extnum_t		num);
372
373/*
374 * Search the extent records for the entry containing block bno.
375 * If bno lies in a hole, point to the next entry.  If bno lies
376 * past eof, *eofp will be set, and *prevp will contain the last
377 * entry (null if none).  Else, *lastxp will be set to the index
378 * of the found entry; *gotp will contain the entry.
379 */
380xfs_bmbt_rec_t *
381xfs_bmap_search_multi_extents(struct xfs_ifork *, xfs_fileoff_t, int *,
382			xfs_extnum_t *, xfs_bmbt_irec_t *, xfs_bmbt_irec_t *);
383
384#endif	/* __KERNEL__ */
385
386#endif	/* __XFS_BMAP_H__ */
387