Line data Source code
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 : #define XFS_BMAPI_FLAGS \
91 : { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
92 : { XFS_BMAPI_METADATA, "METADATA" }, \
93 : { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
94 : { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
95 : { XFS_BMAPI_CONTIG, "CONTIG" }, \
96 : { XFS_BMAPI_CONVERT, "CONVERT" }, \
97 : { XFS_BMAPI_ZERO, "ZERO" }, \
98 : { XFS_BMAPI_REMAP, "REMAP" }, \
99 : { XFS_BMAPI_COWFORK, "COWFORK" }, \
100 : { XFS_BMAPI_NODISCARD, "NODISCARD" }, \
101 : { XFS_BMAPI_NORMAP, "NORMAP" }
102 :
103 :
104 : static inline int xfs_bmapi_aflag(int w)
105 : {
106 1466856353 : return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
107 : (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
108 : }
109 :
110 : static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags)
111 : {
112 3245764821 : if (bmapi_flags & XFS_BMAPI_COWFORK)
113 : return XFS_COW_FORK;
114 3244718663 : else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
115 508880728 : return XFS_ATTR_FORK;
116 : return XFS_DATA_FORK;
117 : }
118 :
119 : /*
120 : * Special values for xfs_bmbt_irec_t br_startblock field.
121 : */
122 : #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
123 : #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
124 :
125 : /*
126 : * Flags for xfs_bmap_add_extent*.
127 : */
128 : #define BMAP_LEFT_CONTIG (1u << 0)
129 : #define BMAP_RIGHT_CONTIG (1u << 1)
130 : #define BMAP_LEFT_FILLING (1u << 2)
131 : #define BMAP_RIGHT_FILLING (1u << 3)
132 : #define BMAP_LEFT_DELAY (1u << 4)
133 : #define BMAP_RIGHT_DELAY (1u << 5)
134 : #define BMAP_LEFT_VALID (1u << 6)
135 : #define BMAP_RIGHT_VALID (1u << 7)
136 : #define BMAP_ATTRFORK (1u << 8)
137 : #define BMAP_COWFORK (1u << 9)
138 :
139 : #define XFS_BMAP_EXT_FLAGS \
140 : { BMAP_LEFT_CONTIG, "LC" }, \
141 : { BMAP_RIGHT_CONTIG, "RC" }, \
142 : { BMAP_LEFT_FILLING, "LF" }, \
143 : { BMAP_RIGHT_FILLING, "RF" }, \
144 : { BMAP_ATTRFORK, "ATTR" }, \
145 : { BMAP_COWFORK, "COW" }
146 :
147 : /* Return true if the extent is an allocated extent, written or not. */
148 : static inline bool xfs_bmap_is_real_extent(const struct xfs_bmbt_irec *irec)
149 : {
150 1645969662 : return irec->br_startblock != HOLESTARTBLOCK &&
151 1261017116 : irec->br_startblock != DELAYSTARTBLOCK &&
152 : !isnullstartblock(irec->br_startblock);
153 : }
154 :
155 : /*
156 : * Return true if the extent is a real, allocated extent, or false if it is a
157 : * delayed allocation, and unwritten extent or a hole.
158 : */
159 913316583 : static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec)
160 : {
161 1738540905 : return xfs_bmap_is_real_extent(irec) &&
162 825021392 : irec->br_state != XFS_EXT_UNWRITTEN;
163 : }
164 :
165 : /*
166 : * Check the mapping for obviously garbage allocations that could trash the
167 : * filesystem immediately.
168 : */
169 : #define xfs_valid_startblock(ip, startblock) \
170 : ((startblock) != 0 || XFS_IS_REALTIME_INODE(ip))
171 :
172 : int xfs_bmap_longest_free_extent(struct xfs_perag *pag,
173 : struct xfs_trans *tp, xfs_extlen_t *blen);
174 : void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
175 : xfs_filblks_t len);
176 : unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp);
177 : int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
178 : void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp,
179 : struct xfs_inode *ip, int whichfork);
180 : void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
181 : int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
182 : xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
183 : int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
184 : xfs_fileoff_t *last_block, int whichfork);
185 : int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
186 : int whichfork);
187 : int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
188 : xfs_filblks_t len, struct xfs_bmbt_irec *mval,
189 : int *nmap, uint32_t flags);
190 : int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
191 : xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
192 : xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap);
193 : int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
194 : xfs_fileoff_t bno, xfs_filblks_t *rlen, uint32_t flags,
195 : xfs_extnum_t nexts);
196 : int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
197 : xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
198 : xfs_extnum_t nexts, int *done);
199 : int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
200 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
201 : struct xfs_bmbt_irec *del);
202 : void xfs_bmap_del_extent_cow(struct xfs_inode *ip,
203 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
204 : struct xfs_bmbt_irec *del);
205 : uint xfs_default_attroffset(struct xfs_inode *ip);
206 : int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip,
207 : xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
208 : bool *done);
209 : int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off,
210 : xfs_fileoff_t shift);
211 : int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip,
212 : xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
213 : bool *done, xfs_fileoff_t stop_fsb);
214 : int xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip,
215 : xfs_fileoff_t split_offset);
216 : int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
217 : xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
218 : struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur,
219 : int eof);
220 : int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork,
221 : xfs_off_t offset, struct iomap *iomap, unsigned int *seq);
222 : int xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp,
223 : struct xfs_inode *ip, int whichfork,
224 : struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp,
225 : struct xfs_bmbt_irec *new, int *logflagsp);
226 : xfs_extlen_t xfs_bmapi_minleft(struct xfs_trans *tp, struct xfs_inode *ip,
227 : int fork);
228 : int xfs_bmap_btalloc_low_space(struct xfs_bmalloca *ap,
229 : struct xfs_alloc_arg *args);
230 :
231 : enum xfs_bmap_intent_type {
232 : XFS_BMAP_MAP = 1,
233 : XFS_BMAP_UNMAP,
234 : };
235 :
236 : struct xfs_bmap_intent {
237 : struct list_head bi_list;
238 : enum xfs_bmap_intent_type bi_type;
239 : int bi_whichfork;
240 : struct xfs_inode *bi_owner;
241 : struct xfs_perag *bi_pag;
242 : struct xfs_bmbt_irec bi_bmap;
243 : };
244 :
245 : void xfs_bmap_update_get_group(struct xfs_mount *mp,
246 : struct xfs_bmap_intent *bi);
247 :
248 : int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_bmap_intent *bi);
249 : void xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip,
250 : struct xfs_bmbt_irec *imap);
251 : void xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip,
252 : struct xfs_bmbt_irec *imap);
253 :
254 : static inline uint32_t xfs_bmap_fork_to_state(int whichfork)
255 : {
256 2163931780 : switch (whichfork) {
257 : case XFS_ATTR_FORK:
258 : return BMAP_ATTRFORK;
259 2206317 : case XFS_COW_FORK:
260 2206317 : return BMAP_COWFORK;
261 2142013083 : default:
262 2142013083 : return 0;
263 : }
264 : }
265 :
266 : xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
267 : struct xfs_bmbt_irec *irec);
268 : int xfs_bmap_complain_bad_rec(struct xfs_inode *ip, int whichfork,
269 : xfs_failaddr_t fa, const struct xfs_bmbt_irec *irec);
270 :
271 : int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip,
272 : xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
273 : uint32_t flags);
274 :
275 : extern struct kmem_cache *xfs_bmap_intent_cache;
276 :
277 : int __init xfs_bmap_intent_init_cache(void);
278 : void xfs_bmap_intent_destroy_cache(void);
279 :
280 : #endif /* __XFS_BMAP_H__ */
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