Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 : * All Rights Reserved.
5 : */
6 : #ifndef __XFS_INODE_FORK_H__
7 : #define __XFS_INODE_FORK_H__
8 :
9 : struct xfs_inode_log_item;
10 : struct xfs_dinode;
11 :
12 : /*
13 : * File incore extent information, present for each of data & attr forks.
14 : */
15 : struct xfs_ifork {
16 : int64_t if_bytes; /* bytes in if_u1 */
17 : struct xfs_btree_block *if_broot; /* file's incore btree root */
18 : unsigned int if_seq; /* fork mod counter */
19 : int if_height; /* height of the extent tree */
20 : union {
21 : void *if_root; /* extent tree root */
22 : char *if_data; /* inline file data */
23 : } if_u1;
24 : xfs_extnum_t if_nextents; /* # of extents in this fork */
25 : short if_broot_bytes; /* bytes allocated for root */
26 : int8_t if_format; /* format of this fork */
27 : uint8_t if_needextents; /* extents have not been read */
28 : };
29 :
30 : /*
31 : * Worst-case increase in the fork extent count when we're adding a single
32 : * extent to a fork and there's no possibility of splitting an existing mapping.
33 : */
34 : #define XFS_IEXT_ADD_NOSPLIT_CNT (1)
35 :
36 : /*
37 : * Punching out an extent from the middle of an existing extent can cause the
38 : * extent count to increase by 1.
39 : * i.e. | Old extent | Hole | Old extent |
40 : */
41 : #define XFS_IEXT_PUNCH_HOLE_CNT (1)
42 :
43 : /*
44 : * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to
45 : * be added. One extra extent for dabtree in case a local attr is
46 : * large enough to cause a double split. It can also cause extent
47 : * count to increase proportional to the size of a remote xattr's
48 : * value.
49 : */
50 : #define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \
51 : (XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))
52 :
53 : /*
54 : * A write to a sub-interval of an existing unwritten extent causes the original
55 : * extent to be split into 3 extents
56 : * i.e. | Unwritten | Real | Unwritten |
57 : * Hence extent count can increase by 2.
58 : */
59 : #define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)
60 :
61 :
62 : /*
63 : * Moving an extent to data fork can cause a sub-interval of an existing extent
64 : * to be unmapped. This will increase extent count by 1. Mapping in the new
65 : * extent can increase the extent count by 1 again i.e.
66 : * | Old extent | New extent | Old extent |
67 : * Hence number of extents increases by 2.
68 : */
69 : #define XFS_IEXT_REFLINK_END_COW_CNT (2)
70 :
71 : /*
72 : * Removing an initial range of source/donor file's extent and adding a new
73 : * extent (from donor/source file) in its place will cause extent count to
74 : * increase by 1.
75 : */
76 : #define XFS_IEXT_SWAP_RMAP_CNT (1)
77 :
78 : /*
79 : * Fork handling.
80 : */
81 : #define XFS_IFORK_MAXEXT(ip, w) \
82 : (xfs_inode_fork_size(ip, w) / sizeof(xfs_bmbt_rec_t))
83 :
84 : static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
85 : {
86 6557892373 : return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
87 : ifp->if_format == XFS_DINODE_FMT_BTREE;
88 : }
89 :
90 : static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
91 : {
92 >14273*10^7 : if (!ifp)
93 : return 0;
94 >14273*10^7 : return ifp->if_nextents;
95 : }
96 :
97 : static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
98 : {
99 4453532245 : if (!ifp)
100 : return XFS_DINODE_FMT_EXTENTS;
101 4453532245 : return ifp->if_format;
102 : }
103 :
104 544943826 : static inline xfs_extnum_t xfs_iext_max_nextents(bool has_large_extent_counts,
105 : int whichfork)
106 : {
107 544943826 : switch (whichfork) {
108 204122152 : case XFS_DATA_FORK:
109 : case XFS_COW_FORK:
110 204122152 : if (has_large_extent_counts)
111 204042994 : return XFS_MAX_EXTCNT_DATA_FORK_LARGE;
112 : return XFS_MAX_EXTCNT_DATA_FORK_SMALL;
113 :
114 340821674 : case XFS_ATTR_FORK:
115 340821674 : if (has_large_extent_counts)
116 340849932 : return XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
117 : return XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
118 :
119 0 : default:
120 0 : ASSERT(0);
121 0 : return 0;
122 : }
123 : }
124 :
125 : static inline xfs_extnum_t
126 1569380536 : xfs_dfork_data_extents(
127 : struct xfs_dinode *dip)
128 : {
129 3138761072 : if (xfs_dinode_has_large_extent_counts(dip))
130 1569379626 : return be64_to_cpu(dip->di_big_nextents);
131 :
132 910 : return be32_to_cpu(dip->di_nextents);
133 : }
134 :
135 : static inline xfs_extnum_t
136 1595495052 : xfs_dfork_attr_extents(
137 : struct xfs_dinode *dip)
138 : {
139 3190990104 : if (xfs_dinode_has_large_extent_counts(dip))
140 1595494576 : return be32_to_cpu(dip->di_big_anextents);
141 :
142 476 : return be16_to_cpu(dip->di_anextents);
143 : }
144 :
145 : static inline xfs_extnum_t
146 935191085 : xfs_dfork_nextents(
147 : struct xfs_dinode *dip,
148 : int whichfork)
149 : {
150 935191085 : switch (whichfork) {
151 454482189 : case XFS_DATA_FORK:
152 454482189 : return xfs_dfork_data_extents(dip);
153 480708896 : case XFS_ATTR_FORK:
154 480708896 : return xfs_dfork_attr_extents(dip);
155 0 : default:
156 0 : ASSERT(0);
157 0 : break;
158 : }
159 :
160 0 : return 0;
161 : }
162 :
163 : void xfs_ifork_zap_attr(struct xfs_inode *ip);
164 : void xfs_ifork_init_attr(struct xfs_inode *ip, enum xfs_dinode_fmt format,
165 : xfs_extnum_t nextents);
166 : struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
167 :
168 : int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
169 : int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
170 : void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
171 : struct xfs_inode_log_item *, int);
172 : void xfs_idestroy_fork(struct xfs_ifork *ifp);
173 : void xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
174 : int whichfork);
175 : void xfs_iroot_alloc(struct xfs_inode *ip, int whichfork,
176 : size_t bytes);
177 : void xfs_iroot_free(struct xfs_inode *ip, int whichfork);
178 : int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
179 : int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
180 : int);
181 : void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
182 : const void *data, int64_t size);
183 :
184 : xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
185 : void xfs_iext_insert_raw(struct xfs_ifork *ifp,
186 : struct xfs_iext_cursor *cur,
187 : struct xfs_bmbt_irec *irec);
188 : void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
189 : struct xfs_bmbt_irec *, int);
190 : void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
191 : int);
192 : void xfs_iext_destroy(struct xfs_ifork *);
193 :
194 : bool xfs_iext_lookup_extent(struct xfs_inode *ip,
195 : struct xfs_ifork *ifp, xfs_fileoff_t bno,
196 : struct xfs_iext_cursor *cur,
197 : struct xfs_bmbt_irec *gotp);
198 : bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
199 : struct xfs_ifork *ifp, xfs_fileoff_t *end,
200 : struct xfs_iext_cursor *cur,
201 : struct xfs_bmbt_irec *gotp);
202 : bool xfs_iext_get_extent(struct xfs_ifork *ifp,
203 : struct xfs_iext_cursor *cur,
204 : struct xfs_bmbt_irec *gotp);
205 : void xfs_iext_update_extent(struct xfs_inode *ip, int state,
206 : struct xfs_iext_cursor *cur,
207 : struct xfs_bmbt_irec *gotp);
208 :
209 : void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
210 : void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
211 : void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
212 : void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
213 :
214 1386588163 : static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
215 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
216 : {
217 1386588163 : xfs_iext_next(ifp, cur);
218 1386599220 : return xfs_iext_get_extent(ifp, cur, gotp);
219 : }
220 :
221 54796390 : static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
222 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
223 : {
224 54796390 : xfs_iext_prev(ifp, cur);
225 54796865 : return xfs_iext_get_extent(ifp, cur, gotp);
226 : }
227 :
228 : /*
229 : * Return the extent after cur in gotp without updating the cursor.
230 : */
231 583422239 : static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
232 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
233 : {
234 583422239 : struct xfs_iext_cursor ncur = *cur;
235 :
236 583422239 : xfs_iext_next(ifp, &ncur);
237 583423430 : return xfs_iext_get_extent(ifp, &ncur, gotp);
238 : }
239 :
240 : /*
241 : * Return the extent before cur in gotp without updating the cursor.
242 : */
243 369986072 : static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
244 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
245 : {
246 369986072 : struct xfs_iext_cursor ncur = *cur;
247 :
248 369986072 : xfs_iext_prev(ifp, &ncur);
249 369986571 : return xfs_iext_get_extent(ifp, &ncur, gotp);
250 : }
251 :
252 : #define for_each_xfs_iext(ifp, ext, got) \
253 : for (xfs_iext_first((ifp), (ext)); \
254 : xfs_iext_get_extent((ifp), (ext), (got)); \
255 : xfs_iext_next((ifp), (ext)))
256 :
257 : extern struct kmem_cache *xfs_ifork_cache;
258 :
259 : extern void xfs_ifork_init_cow(struct xfs_inode *ip);
260 :
261 : int xfs_ifork_verify_local_data(struct xfs_inode *ip);
262 : int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
263 : int xfs_iext_count_may_overflow(struct xfs_inode *ip, int whichfork,
264 : int nr_to_add);
265 : int xfs_iext_count_upgrade(struct xfs_trans *tp, struct xfs_inode *ip,
266 : uint nr_to_add);
267 : bool xfs_ifork_is_realtime(struct xfs_inode *ip, int whichfork);
268 :
269 : /* returns true if the fork has extents but they are not read in yet. */
270 : static inline bool xfs_need_iread_extents(const struct xfs_ifork *ifp)
271 : {
272 : /* see xfs_iformat_{data,attr}_fork() for needextents semantics */
273 11970108224 : return smp_load_acquire(&ifp->if_needextents) != 0;
274 : }
275 :
276 : struct xfs_ifork_broot_ops {
277 : /* Calculate the number of records/keys in the incore btree block. */
278 : unsigned int (*maxrecs)(struct xfs_mount *mp, unsigned int blocksize,
279 : bool leaf);
280 :
281 : /* Calculate the bytes required for the incore btree root block. */
282 : size_t (*size)(struct xfs_mount *mp, unsigned int level,
283 : unsigned int nrecs);
284 :
285 : /*
286 : * Move an incore btree root from one buffer to another. Note that
287 : * src_broot and dst_broot could be the same or they could be totally
288 : * separate memory regions.
289 : */
290 : void (*move)(struct xfs_inode *ip, int whichfork,
291 : struct xfs_btree_block *dst_broot, size_t dst_bytes,
292 : struct xfs_btree_block *src_broot, size_t src_bytes,
293 : unsigned int level, unsigned int numrecs);
294 : };
295 :
296 : void xfs_iroot_realloc(struct xfs_inode *ip, int whichfork,
297 : const struct xfs_ifork_broot_ops *ops, int rec_diff);
298 :
299 : #endif /* __XFS_INODE_FORK_H__ */
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