Linux kernel mirror (for testing)
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linux
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
9struct xfs_inode_log_item;
10struct xfs_dinode;
11
12/*
13 * File incore extent information, present for each of data & attr forks.
14 */
15struct xfs_ifork {
16 int64_t if_bytes; /* bytes in if_data */
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 void *if_data; /* extent tree root or
21 inline data */
22 xfs_extnum_t if_nextents; /* # of extents in this fork */
23 short if_broot_bytes; /* bytes allocated for root */
24 int8_t if_format; /* format of this fork */
25 uint8_t if_needextents; /* extents have not been read */
26};
27
28/*
29 * Worst-case increase in the fork extent count when we're adding a single
30 * extent to a fork and there's no possibility of splitting an existing mapping.
31 */
32#define XFS_IEXT_ADD_NOSPLIT_CNT (1)
33
34/*
35 * Punching out an extent from the middle of an existing extent can cause the
36 * extent count to increase by 1.
37 * i.e. | Old extent | Hole | Old extent |
38 */
39#define XFS_IEXT_PUNCH_HOLE_CNT (1)
40
41/*
42 * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to
43 * be added. One extra extent for dabtree in case a local attr is
44 * large enough to cause a double split. It can also cause extent
45 * count to increase proportional to the size of a remote xattr's
46 * value.
47 */
48#define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \
49 (XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))
50
51/*
52 * A write to a sub-interval of an existing unwritten extent causes the original
53 * extent to be split into 3 extents
54 * i.e. | Unwritten | Real | Unwritten |
55 * Hence extent count can increase by 2.
56 */
57#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)
58
59
60/*
61 * Moving an extent to data fork can cause a sub-interval of an existing extent
62 * to be unmapped. This will increase extent count by 1. Mapping in the new
63 * extent can increase the extent count by 1 again i.e.
64 * | Old extent | New extent | Old extent |
65 * Hence number of extents increases by 2.
66 */
67#define XFS_IEXT_REFLINK_END_COW_CNT (2)
68
69/*
70 * Removing an initial range of source/donor file's extent and adding a new
71 * extent (from donor/source file) in its place will cause extent count to
72 * increase by 1.
73 */
74#define XFS_IEXT_SWAP_RMAP_CNT (1)
75
76/*
77 * Fork handling.
78 */
79#define XFS_IFORK_MAXEXT(ip, w) \
80 (xfs_inode_fork_size(ip, w) / sizeof(xfs_bmbt_rec_t))
81
82static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
83{
84 return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
85 ifp->if_format == XFS_DINODE_FMT_BTREE;
86}
87
88static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
89{
90 if (!ifp)
91 return 0;
92 return ifp->if_nextents;
93}
94
95static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
96{
97 if (!ifp)
98 return XFS_DINODE_FMT_EXTENTS;
99 return ifp->if_format;
100}
101
102static inline xfs_extnum_t xfs_iext_max_nextents(bool has_large_extent_counts,
103 int whichfork)
104{
105 switch (whichfork) {
106 case XFS_DATA_FORK:
107 case XFS_COW_FORK:
108 if (has_large_extent_counts)
109 return XFS_MAX_EXTCNT_DATA_FORK_LARGE;
110 return XFS_MAX_EXTCNT_DATA_FORK_SMALL;
111
112 case XFS_ATTR_FORK:
113 if (has_large_extent_counts)
114 return XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
115 return XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
116
117 default:
118 ASSERT(0);
119 return 0;
120 }
121}
122
123static inline xfs_extnum_t
124xfs_dfork_data_extents(
125 struct xfs_dinode *dip)
126{
127 if (xfs_dinode_has_large_extent_counts(dip))
128 return be64_to_cpu(dip->di_big_nextents);
129
130 return be32_to_cpu(dip->di_nextents);
131}
132
133static inline xfs_extnum_t
134xfs_dfork_attr_extents(
135 struct xfs_dinode *dip)
136{
137 if (xfs_dinode_has_large_extent_counts(dip))
138 return be32_to_cpu(dip->di_big_anextents);
139
140 return be16_to_cpu(dip->di_anextents);
141}
142
143static inline xfs_extnum_t
144xfs_dfork_nextents(
145 struct xfs_dinode *dip,
146 int whichfork)
147{
148 switch (whichfork) {
149 case XFS_DATA_FORK:
150 return xfs_dfork_data_extents(dip);
151 case XFS_ATTR_FORK:
152 return xfs_dfork_attr_extents(dip);
153 default:
154 ASSERT(0);
155 break;
156 }
157
158 return 0;
159}
160
161void xfs_ifork_zap_attr(struct xfs_inode *ip);
162void xfs_ifork_init_attr(struct xfs_inode *ip, enum xfs_dinode_fmt format,
163 xfs_extnum_t nextents);
164struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
165
166int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
167int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
168void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
169 struct xfs_inode_log_item *, int);
170void xfs_idestroy_fork(struct xfs_ifork *ifp);
171void * xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
172 int whichfork);
173struct xfs_btree_block *xfs_broot_alloc(struct xfs_ifork *ifp,
174 size_t new_size);
175struct xfs_btree_block *xfs_broot_realloc(struct xfs_ifork *ifp,
176 size_t new_size);
177
178int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
179int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
180 int);
181void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
182 const void *data, int64_t size);
183
184xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
185void xfs_iext_insert_raw(struct xfs_ifork *ifp,
186 struct xfs_iext_cursor *cur,
187 struct xfs_bmbt_irec *irec);
188void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
189 struct xfs_bmbt_irec *, int);
190void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
191 int);
192void xfs_iext_destroy(struct xfs_ifork *);
193
194bool 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);
198bool 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);
202bool xfs_iext_get_extent(struct xfs_ifork *ifp,
203 struct xfs_iext_cursor *cur,
204 struct xfs_bmbt_irec *gotp);
205void xfs_iext_update_extent(struct xfs_inode *ip, int state,
206 struct xfs_iext_cursor *cur,
207 struct xfs_bmbt_irec *gotp);
208
209void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
210void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
211void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
212void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
213
214static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
215 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
216{
217 xfs_iext_next(ifp, cur);
218 return xfs_iext_get_extent(ifp, cur, gotp);
219}
220
221static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
222 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
223{
224 xfs_iext_prev(ifp, cur);
225 return xfs_iext_get_extent(ifp, cur, gotp);
226}
227
228/*
229 * Return the extent after cur in gotp without updating the cursor.
230 */
231static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
232 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
233{
234 struct xfs_iext_cursor ncur = *cur;
235
236 xfs_iext_next(ifp, &ncur);
237 return xfs_iext_get_extent(ifp, &ncur, gotp);
238}
239
240/*
241 * Return the extent before cur in gotp without updating the cursor.
242 */
243static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
244 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
245{
246 struct xfs_iext_cursor ncur = *cur;
247
248 xfs_iext_prev(ifp, &ncur);
249 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
257extern struct kmem_cache *xfs_ifork_cache;
258
259extern void xfs_ifork_init_cow(struct xfs_inode *ip);
260
261int xfs_ifork_verify_local_data(struct xfs_inode *ip);
262int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
263int xfs_iext_count_extend(struct xfs_trans *tp, struct xfs_inode *ip,
264 int whichfork, uint nr_to_add);
265bool xfs_ifork_is_realtime(struct xfs_inode *ip, int whichfork);
266
267/* returns true if the fork has extents but they are not read in yet. */
268static inline bool xfs_need_iread_extents(const struct xfs_ifork *ifp)
269{
270 /* see xfs_iformat_{data,attr}_fork() for needextents semantics */
271 return smp_load_acquire(&ifp->if_needextents) != 0;
272}
273
274#endif /* __XFS_INODE_FORK_H__ */