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 3891102638 : 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 96741831884 : if (!ifp)
93 : return 0;
94 96741826957 : return ifp->if_nextents;
95 : }
96 :
97 : static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
98 : {
99 2664183827 : if (!ifp)
100 : return XFS_DINODE_FMT_EXTENTS;
101 2664183827 : return ifp->if_format;
102 : }
103 :
104 219845841 : static inline xfs_extnum_t xfs_iext_max_nextents(bool has_large_extent_counts,
105 : int whichfork)
106 : {
107 219845841 : switch (whichfork) {
108 120714290 : case XFS_DATA_FORK:
109 : case XFS_COW_FORK:
110 120714290 : if (has_large_extent_counts)
111 120636423 : return XFS_MAX_EXTCNT_DATA_FORK_LARGE;
112 : return XFS_MAX_EXTCNT_DATA_FORK_SMALL;
113 :
114 99131551 : case XFS_ATTR_FORK:
115 99131551 : if (has_large_extent_counts)
116 99135102 : 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 1718431919 : xfs_dfork_data_extents(
127 : struct xfs_dinode *dip)
128 : {
129 3436863838 : if (xfs_dinode_has_large_extent_counts(dip))
130 1718430821 : return be64_to_cpu(dip->di_big_nextents);
131 :
132 1098 : return be32_to_cpu(dip->di_nextents);
133 : }
134 :
135 : static inline xfs_extnum_t
136 1084990587 : xfs_dfork_attr_extents(
137 : struct xfs_dinode *dip)
138 : {
139 2169981174 : if (xfs_dinode_has_large_extent_counts(dip))
140 1084990071 : return be32_to_cpu(dip->di_big_anextents);
141 :
142 516 : return be16_to_cpu(dip->di_anextents);
143 : }
144 :
145 : static inline xfs_extnum_t
146 394321385 : xfs_dfork_nextents(
147 : struct xfs_dinode *dip,
148 : int whichfork)
149 : {
150 394321385 : switch (whichfork) {
151 354478921 : case XFS_DATA_FORK:
152 354478921 : return xfs_dfork_data_extents(dip);
153 39842464 : case XFS_ATTR_FORK:
154 39842464 : 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_realloc(struct xfs_inode *, int, int);
176 : int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
177 : int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
178 : int);
179 : void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
180 : const void *data, int64_t size);
181 :
182 : xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
183 : void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
184 : struct xfs_bmbt_irec *, int);
185 : void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
186 : int);
187 : void xfs_iext_destroy(struct xfs_ifork *);
188 :
189 : bool xfs_iext_lookup_extent(struct xfs_inode *ip,
190 : struct xfs_ifork *ifp, xfs_fileoff_t bno,
191 : struct xfs_iext_cursor *cur,
192 : struct xfs_bmbt_irec *gotp);
193 : bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
194 : struct xfs_ifork *ifp, xfs_fileoff_t *end,
195 : struct xfs_iext_cursor *cur,
196 : struct xfs_bmbt_irec *gotp);
197 : bool xfs_iext_get_extent(struct xfs_ifork *ifp,
198 : struct xfs_iext_cursor *cur,
199 : struct xfs_bmbt_irec *gotp);
200 : void xfs_iext_update_extent(struct xfs_inode *ip, int state,
201 : struct xfs_iext_cursor *cur,
202 : struct xfs_bmbt_irec *gotp);
203 :
204 : void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
205 : void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
206 : void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
207 : void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
208 :
209 749528245 : static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
210 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
211 : {
212 749528245 : xfs_iext_next(ifp, cur);
213 749535501 : return xfs_iext_get_extent(ifp, cur, gotp);
214 : }
215 :
216 42266291 : static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
217 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
218 : {
219 42266291 : xfs_iext_prev(ifp, cur);
220 42266538 : return xfs_iext_get_extent(ifp, cur, gotp);
221 : }
222 :
223 : /*
224 : * Return the extent after cur in gotp without updating the cursor.
225 : */
226 391027179 : static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
227 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
228 : {
229 391027179 : struct xfs_iext_cursor ncur = *cur;
230 :
231 391027179 : xfs_iext_next(ifp, &ncur);
232 391037088 : return xfs_iext_get_extent(ifp, &ncur, gotp);
233 : }
234 :
235 : /*
236 : * Return the extent before cur in gotp without updating the cursor.
237 : */
238 245134141 : static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
239 : struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
240 : {
241 245134141 : struct xfs_iext_cursor ncur = *cur;
242 :
243 245134141 : xfs_iext_prev(ifp, &ncur);
244 245140308 : return xfs_iext_get_extent(ifp, &ncur, gotp);
245 : }
246 :
247 : #define for_each_xfs_iext(ifp, ext, got) \
248 : for (xfs_iext_first((ifp), (ext)); \
249 : xfs_iext_get_extent((ifp), (ext), (got)); \
250 : xfs_iext_next((ifp), (ext)))
251 :
252 : extern struct kmem_cache *xfs_ifork_cache;
253 :
254 : extern void xfs_ifork_init_cow(struct xfs_inode *ip);
255 :
256 : int xfs_ifork_verify_local_data(struct xfs_inode *ip);
257 : int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
258 : int xfs_iext_count_may_overflow(struct xfs_inode *ip, int whichfork,
259 : int nr_to_add);
260 : int xfs_iext_count_upgrade(struct xfs_trans *tp, struct xfs_inode *ip,
261 : uint nr_to_add);
262 :
263 : /* returns true if the fork has extents but they are not read in yet. */
264 : static inline bool xfs_need_iread_extents(const struct xfs_ifork *ifp)
265 : {
266 : /* see xfs_iformat_{data,attr}_fork() for needextents semantics */
267 5330106512 : return smp_load_acquire(&ifp->if_needextents) != 0;
268 : }
269 :
270 : #endif /* __XFS_INODE_FORK_H__ */
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