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
16 /*
17 * Argument structure for xfs_bmap_alloc.
18 */
19 struct xfs_bmalloca {
20 struct xfs_trans *tp; /* transaction pointer */
21 struct xfs_inode *ip; /* incore inode pointer */
22 struct xfs_bmbt_irec prev; /* extent before the new one */
23 struct xfs_bmbt_irec got; /* extent after, or delayed */
24
25 xfs_fileoff_t offset; /* offset in file filling in */
26 xfs_extlen_t length; /* i/o length asked/allocated */
27 xfs_fsblock_t blkno; /* starting block of new extent */
28
29 struct xfs_btree_cur *cur; /* btree cursor */
30 struct xfs_iext_cursor icur; /* incore extent cursor */
31 int nallocs;/* number of extents alloc'd */
32 int logflags;/* flags for transaction logging */
33
34 xfs_extlen_t total; /* total blocks needed for xaction */
35 xfs_extlen_t minlen; /* minimum allocation size (blocks) */
36 xfs_extlen_t minleft; /* amount must be left after alloc */
37 bool eof; /* set if allocating past last extent */
38 bool wasdel; /* replacing a delayed allocation */
39 bool aeof; /* allocated space at eof */
40 bool conv; /* overwriting unwritten extents */
41 int datatype;/* data type being allocated */
42 int flags;
43 };
44
45 #define XFS_BMAP_MAX_NMAP 4
46
47 /*
48 * Flags for xfs_bmapi_*
49 */
50 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */
51 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
52 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
53 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
54 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */
55 /*
56 * unwritten extent conversion - this needs write cache flushing and no additional
57 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
58 * from written to unwritten, otherwise convert from unwritten to written.
59 */
60 #define XFS_BMAPI_CONVERT 0x040
61
62 /*
63 * allocate zeroed extents - this requires all newly allocated user data extents
64 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
65 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
66 * during the allocation range to zeroed written extents.
67 */
68 #define XFS_BMAPI_ZERO 0x080
69
70 /*
71 * Map the inode offset to the block given in ap->firstblock. Primarily
72 * used for reflink. The range must be in a hole, and this flag cannot be
73 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
74 *
75 * For bunmapi, this flag unmaps the range without adjusting quota, reducing
76 * refcount, or freeing the blocks.
77 */
78 #define XFS_BMAPI_REMAP 0x100
79
80 /* Map something in the CoW fork. */
81 #define XFS_BMAPI_COWFORK 0x200
82
83 /* Skip online discard of freed extents */
84 #define XFS_BMAPI_NODISCARD 0x1000
85
86 /* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */
87 #define XFS_BMAPI_NORMAP 0x2000
88
89 #define XFS_BMAPI_FLAGS \
90 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
91 { XFS_BMAPI_METADATA, "METADATA" }, \
92 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
93 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
94 { XFS_BMAPI_CONTIG, "CONTIG" }, \
95 { XFS_BMAPI_CONVERT, "CONVERT" }, \
96 { XFS_BMAPI_ZERO, "ZERO" }, \
97 { XFS_BMAPI_REMAP, "REMAP" }, \
98 { XFS_BMAPI_COWFORK, "COWFORK" }, \
99 { XFS_BMAPI_NODISCARD, "NODISCARD" }, \
100 { XFS_BMAPI_NORMAP, "NORMAP" }
101
102
xfs_bmapi_aflag(int w)103 static inline int xfs_bmapi_aflag(int w)
104 {
105 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
106 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
107 }
108
xfs_bmapi_whichfork(int bmapi_flags)109 static inline int xfs_bmapi_whichfork(int bmapi_flags)
110 {
111 if (bmapi_flags & XFS_BMAPI_COWFORK)
112 return XFS_COW_FORK;
113 else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
114 return XFS_ATTR_FORK;
115 return XFS_DATA_FORK;
116 }
117
118 /*
119 * Special values for xfs_bmbt_irec_t br_startblock field.
120 */
121 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
122 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
123
124 /*
125 * Flags for xfs_bmap_add_extent*.
126 */
127 #define BMAP_LEFT_CONTIG (1 << 0)
128 #define BMAP_RIGHT_CONTIG (1 << 1)
129 #define BMAP_LEFT_FILLING (1 << 2)
130 #define BMAP_RIGHT_FILLING (1 << 3)
131 #define BMAP_LEFT_DELAY (1 << 4)
132 #define BMAP_RIGHT_DELAY (1 << 5)
133 #define BMAP_LEFT_VALID (1 << 6)
134 #define BMAP_RIGHT_VALID (1 << 7)
135 #define BMAP_ATTRFORK (1 << 8)
136 #define BMAP_COWFORK (1 << 9)
137
138 #define XFS_BMAP_EXT_FLAGS \
139 { BMAP_LEFT_CONTIG, "LC" }, \
140 { BMAP_RIGHT_CONTIG, "RC" }, \
141 { BMAP_LEFT_FILLING, "LF" }, \
142 { BMAP_RIGHT_FILLING, "RF" }, \
143 { BMAP_ATTRFORK, "ATTR" }, \
144 { BMAP_COWFORK, "COW" }
145
146 /* Return true if the extent is an allocated extent, written or not. */
xfs_bmap_is_real_extent(struct xfs_bmbt_irec * irec)147 static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
148 {
149 return irec->br_startblock != HOLESTARTBLOCK &&
150 irec->br_startblock != DELAYSTARTBLOCK &&
151 !isnullstartblock(irec->br_startblock);
152 }
153
154 /*
155 * Return true if the extent is a real, allocated extent, or false if it is a
156 * delayed allocation, and unwritten extent or a hole.
157 */
xfs_bmap_is_written_extent(struct xfs_bmbt_irec * irec)158 static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec)
159 {
160 return xfs_bmap_is_real_extent(irec) &&
161 irec->br_state != XFS_EXT_UNWRITTEN;
162 }
163
164 /*
165 * Check the mapping for obviously garbage allocations that could trash the
166 * filesystem immediately.
167 */
168 #define xfs_valid_startblock(ip, startblock) \
169 ((startblock) != 0 || XFS_IS_REALTIME_INODE(ip))
170
171 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
172 xfs_filblks_t len);
173 unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp);
174 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
175 void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp,
176 struct xfs_inode *ip, int whichfork);
177 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
178 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
179 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
180 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
181 xfs_fileoff_t *last_block, int whichfork);
182 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
183 int whichfork);
184 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
185 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
186 int *nmap, int flags);
187 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
188 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
189 xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap);
190 int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
191 xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags,
192 xfs_extnum_t nexts);
193 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
194 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
195 xfs_extnum_t nexts, int *done);
196 int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
197 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
198 struct xfs_bmbt_irec *del);
199 void xfs_bmap_del_extent_cow(struct xfs_inode *ip,
200 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
201 struct xfs_bmbt_irec *del);
202 uint xfs_default_attroffset(struct xfs_inode *ip);
203 int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip,
204 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
205 bool *done);
206 int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off,
207 xfs_fileoff_t shift);
208 int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip,
209 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
210 bool *done, xfs_fileoff_t stop_fsb);
211 int xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip,
212 xfs_fileoff_t split_offset);
213 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
214 xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
215 struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur,
216 int eof);
217 int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork,
218 xfs_off_t offset, struct iomap *iomap, unsigned int *seq);
219 int xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp,
220 struct xfs_inode *ip, int whichfork,
221 struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp,
222 struct xfs_bmbt_irec *new, int *logflagsp);
223
224 enum xfs_bmap_intent_type {
225 XFS_BMAP_MAP = 1,
226 XFS_BMAP_UNMAP,
227 };
228
229 struct xfs_bmap_intent {
230 struct list_head bi_list;
231 enum xfs_bmap_intent_type bi_type;
232 int bi_whichfork;
233 struct xfs_inode *bi_owner;
234 struct xfs_bmbt_irec bi_bmap;
235 };
236
237 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_inode *ip,
238 enum xfs_bmap_intent_type type, int whichfork,
239 xfs_fileoff_t startoff, xfs_fsblock_t startblock,
240 xfs_filblks_t *blockcount, xfs_exntst_t state);
241 void xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip,
242 struct xfs_bmbt_irec *imap);
243 void xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip,
244 struct xfs_bmbt_irec *imap);
245
xfs_bmap_fork_to_state(int whichfork)246 static inline int xfs_bmap_fork_to_state(int whichfork)
247 {
248 switch (whichfork) {
249 case XFS_ATTR_FORK:
250 return BMAP_ATTRFORK;
251 case XFS_COW_FORK:
252 return BMAP_COWFORK;
253 default:
254 return 0;
255 }
256 }
257
258 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
259 struct xfs_bmbt_irec *irec);
260
261 int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip,
262 xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
263 int flags);
264
265 extern struct kmem_cache *xfs_bmap_intent_cache;
266
267 int __init xfs_bmap_intent_init_cache(void);
268 void xfs_bmap_intent_destroy_cache(void);
269
270 #endif /* __XFS_BMAP_H__ */
271