1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #ifndef __XFS_BMAP_H__
7 #define __XFS_BMAP_H__
8
9 struct getbmap;
10 struct xfs_bmbt_irec;
11 struct xfs_ifork;
12 struct xfs_inode;
13 struct xfs_mount;
14 struct xfs_trans;
15 struct xfs_alloc_arg;
16
17 /*
18 * Argument structure for xfs_bmap_alloc.
19 */
20 struct xfs_bmalloca {
21 struct xfs_trans *tp; /* transaction pointer */
22 struct xfs_inode *ip; /* incore inode pointer */
23 struct xfs_bmbt_irec prev; /* extent before the new one */
24 struct xfs_bmbt_irec got; /* extent after, or delayed */
25
26 xfs_fileoff_t offset; /* offset in file filling in */
27 xfs_extlen_t length; /* i/o length asked/allocated */
28 xfs_fsblock_t blkno; /* starting block of new extent */
29
30 struct xfs_btree_cur *cur; /* btree cursor */
31 struct xfs_iext_cursor icur; /* incore extent cursor */
32 int nallocs;/* number of extents alloc'd */
33 int logflags;/* flags for transaction logging */
34
35 xfs_extlen_t total; /* total blocks needed for xaction */
36 xfs_extlen_t minlen; /* minimum allocation size (blocks) */
37 xfs_extlen_t minleft; /* amount must be left after alloc */
38 bool eof; /* set if allocating past last extent */
39 bool wasdel; /* replacing a delayed allocation */
40 bool aeof; /* allocated space at eof */
41 bool conv; /* overwriting unwritten extents */
42 int datatype;/* data type being allocated */
43 uint32_t flags;
44 };
45
46 #define XFS_BMAP_MAX_NMAP 4
47
48 /*
49 * Flags for xfs_bmapi_*
50 */
51 #define XFS_BMAPI_ENTIRE (1u << 0) /* return entire extent untrimmed */
52 #define XFS_BMAPI_METADATA (1u << 1) /* mapping metadata not user data */
53 #define XFS_BMAPI_ATTRFORK (1u << 2) /* use attribute fork not data */
54 #define XFS_BMAPI_PREALLOC (1u << 3) /* preallocating unwritten space */
55 #define XFS_BMAPI_CONTIG (1u << 4) /* must allocate only one extent */
56 /*
57 * unwritten extent conversion - this needs write cache flushing and no additional
58 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
59 * from written to unwritten, otherwise convert from unwritten to written.
60 */
61 #define XFS_BMAPI_CONVERT (1u << 5)
62
63 /*
64 * allocate zeroed extents - this requires all newly allocated user data extents
65 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
66 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
67 * during the allocation range to zeroed written extents.
68 */
69 #define XFS_BMAPI_ZERO (1u << 6)
70
71 /*
72 * Map the inode offset to the block given in ap->firstblock. Primarily
73 * used for reflink. The range must be in a hole, and this flag cannot be
74 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
75 *
76 * For bunmapi, this flag unmaps the range without adjusting quota, reducing
77 * refcount, or freeing the blocks.
78 */
79 #define XFS_BMAPI_REMAP (1u << 7)
80
81 /* Map something in the CoW fork. */
82 #define XFS_BMAPI_COWFORK (1u << 8)
83
84 /* Skip online discard of freed extents */
85 #define XFS_BMAPI_NODISCARD (1u << 9)
86
87 /* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */
88 #define XFS_BMAPI_NORMAP (1u << 10)
89
90 /* Try to align allocations to the extent size hint */
91 #define XFS_BMAPI_EXTSZALIGN (1u << 11)
92
93 #define XFS_BMAPI_FLAGS \
94 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
95 { XFS_BMAPI_METADATA, "METADATA" }, \
96 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
97 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
98 { XFS_BMAPI_CONTIG, "CONTIG" }, \
99 { XFS_BMAPI_CONVERT, "CONVERT" }, \
100 { XFS_BMAPI_ZERO, "ZERO" }, \
101 { XFS_BMAPI_REMAP, "REMAP" }, \
102 { XFS_BMAPI_COWFORK, "COWFORK" }, \
103 { XFS_BMAPI_NODISCARD, "NODISCARD" }, \
104 { XFS_BMAPI_NORMAP, "NORMAP" },\
105 { XFS_BMAPI_EXTSZALIGN, "EXTSZALIGN" }
106
107
xfs_bmapi_aflag(int w)108 static inline int xfs_bmapi_aflag(int w)
109 {
110 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
111 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
112 }
113
xfs_bmapi_whichfork(uint32_t bmapi_flags)114 static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags)
115 {
116 if (bmapi_flags & XFS_BMAPI_COWFORK)
117 return XFS_COW_FORK;
118 else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
119 return XFS_ATTR_FORK;
120 return XFS_DATA_FORK;
121 }
122
123 void xfs_bmap_alloc_account(struct xfs_bmalloca *ap);
124
125 /*
126 * Special values for xfs_bmbt_irec_t br_startblock field.
127 */
128 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
129 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
130
131 /*
132 * Flags for xfs_bmap_add_extent*.
133 */
134 #define BMAP_LEFT_CONTIG (1u << 0)
135 #define BMAP_RIGHT_CONTIG (1u << 1)
136 #define BMAP_LEFT_FILLING (1u << 2)
137 #define BMAP_RIGHT_FILLING (1u << 3)
138 #define BMAP_LEFT_DELAY (1u << 4)
139 #define BMAP_RIGHT_DELAY (1u << 5)
140 #define BMAP_LEFT_VALID (1u << 6)
141 #define BMAP_RIGHT_VALID (1u << 7)
142 #define BMAP_ATTRFORK (1u << 8)
143 #define BMAP_COWFORK (1u << 9)
144
145 #define XFS_BMAP_EXT_FLAGS \
146 { BMAP_LEFT_CONTIG, "LC" }, \
147 { BMAP_RIGHT_CONTIG, "RC" }, \
148 { BMAP_LEFT_FILLING, "LF" }, \
149 { BMAP_RIGHT_FILLING, "RF" }, \
150 { BMAP_ATTRFORK, "ATTR" }, \
151 { BMAP_COWFORK, "COW" }
152
153 /* Return true if the extent is an allocated extent, written or not. */
xfs_bmap_is_real_extent(const struct xfs_bmbt_irec * irec)154 static inline bool xfs_bmap_is_real_extent(const struct xfs_bmbt_irec *irec)
155 {
156 return irec->br_startblock != HOLESTARTBLOCK &&
157 irec->br_startblock != DELAYSTARTBLOCK &&
158 !isnullstartblock(irec->br_startblock);
159 }
160
161 /*
162 * Return true if the extent is a real, allocated extent, or false if it is a
163 * delayed allocation, and unwritten extent or a hole.
164 */
xfs_bmap_is_written_extent(const struct xfs_bmbt_irec * irec)165 static inline bool xfs_bmap_is_written_extent(const struct xfs_bmbt_irec *irec)
166 {
167 return xfs_bmap_is_real_extent(irec) &&
168 irec->br_state != XFS_EXT_UNWRITTEN;
169 }
170
171 /*
172 * Check the mapping for obviously garbage allocations that could trash the
173 * filesystem immediately.
174 */
175 #define xfs_valid_startblock(ip, startblock) \
176 ((startblock) != 0 || XFS_IS_REALTIME_INODE(ip))
177
178 int xfs_bmap_longest_free_extent(struct xfs_perag *pag,
179 struct xfs_trans *tp, xfs_extlen_t *blen);
180 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
181 xfs_filblks_t len);
182 unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp);
183 int xfs_bmap_add_attrfork(struct xfs_trans *tp, struct xfs_inode *ip,
184 int size, int rsvd);
185 void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp,
186 struct xfs_inode *ip, int whichfork);
187 int xfs_bmap_local_to_extents(struct xfs_trans *tp, struct xfs_inode *ip,
188 xfs_extlen_t total, int *logflagsp, int whichfork,
189 void (*init_fn)(struct xfs_trans *tp, struct xfs_buf *bp,
190 struct xfs_inode *ip, struct xfs_ifork *ifp,
191 void *priv),
192 void *priv);
193 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
194 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
195 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
196 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
197 xfs_fileoff_t *last_block, int whichfork);
198 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
199 int whichfork);
200 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
201 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
202 int *nmap, uint32_t flags);
203 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
204 xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
205 xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap);
206 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
207 xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
208 xfs_extnum_t nexts, int *done);
209 void xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
210 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
211 struct xfs_bmbt_irec *del, uint32_t bflags);
212 void xfs_bmap_del_extent_cow(struct xfs_inode *ip,
213 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
214 struct xfs_bmbt_irec *del);
215 uint xfs_default_attroffset(struct xfs_inode *ip);
216 int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip,
217 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
218 bool *done);
219 int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off,
220 xfs_fileoff_t shift);
221 int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip,
222 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
223 bool *done, xfs_fileoff_t stop_fsb);
224 int xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip,
225 xfs_fileoff_t split_offset);
226 int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork,
227 xfs_off_t offset, struct iomap *iomap, unsigned int *seq);
228 int xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp,
229 struct xfs_inode *ip, int whichfork,
230 struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp,
231 struct xfs_bmbt_irec *new, int *logflagsp);
232 xfs_extlen_t xfs_bmapi_minleft(struct xfs_trans *tp, struct xfs_inode *ip,
233 int fork);
234 int xfs_bmap_btalloc_low_space(struct xfs_bmalloca *ap,
235 struct xfs_alloc_arg *args);
236 xfs_filblks_t xfs_bmap_worst_indlen(struct xfs_inode *ip, xfs_filblks_t len);
237
238 enum xfs_bmap_intent_type {
239 XFS_BMAP_MAP = 1,
240 XFS_BMAP_UNMAP,
241 };
242
243 #define XFS_BMAP_INTENT_STRINGS \
244 { XFS_BMAP_MAP, "map" }, \
245 { XFS_BMAP_UNMAP, "unmap" }
246
247 struct xfs_bmap_intent {
248 struct list_head bi_list;
249 enum xfs_bmap_intent_type bi_type;
250 int bi_whichfork;
251 struct xfs_inode *bi_owner;
252 struct xfs_group *bi_group;
253 struct xfs_bmbt_irec bi_bmap;
254 };
255
256 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_bmap_intent *bi);
257 void xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip,
258 int whichfork, struct xfs_bmbt_irec *imap);
259 void xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip,
260 int whichfork, struct xfs_bmbt_irec *imap);
261
xfs_bmap_fork_to_state(int whichfork)262 static inline uint32_t xfs_bmap_fork_to_state(int whichfork)
263 {
264 switch (whichfork) {
265 case XFS_ATTR_FORK:
266 return BMAP_ATTRFORK;
267 case XFS_COW_FORK:
268 return BMAP_COWFORK;
269 default:
270 return 0;
271 }
272 }
273
274 xfs_failaddr_t xfs_bmap_validate_extent_raw(struct xfs_mount *mp, bool rtfile,
275 int whichfork, struct xfs_bmbt_irec *irec);
276 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
277 struct xfs_bmbt_irec *irec);
278 int xfs_bmap_complain_bad_rec(struct xfs_inode *ip, int whichfork,
279 xfs_failaddr_t fa, const struct xfs_bmbt_irec *irec);
280
281 int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip,
282 xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
283 uint32_t flags);
284 int xfs_bunmapi_range(struct xfs_trans **tpp, struct xfs_inode *ip,
285 uint32_t flags, xfs_fileoff_t startoff, xfs_fileoff_t endoff);
286
287 extern struct kmem_cache *xfs_bmap_intent_cache;
288
289 int __init xfs_bmap_intent_init_cache(void);
290 void xfs_bmap_intent_destroy_cache(void);
291
292 typedef int (*xfs_bmap_query_range_fn)(
293 struct xfs_btree_cur *cur,
294 struct xfs_bmbt_irec *rec,
295 void *priv);
296
297 int xfs_bmap_query_all(struct xfs_btree_cur *cur, xfs_bmap_query_range_fn fn,
298 void *priv);
299
300 xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
301 xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip);
302
303 #endif /* __XFS_BMAP_H__ */
304