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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_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};
28
29/*
30 * Worst-case increase in the fork extent count when we're adding a single
31 * extent to a fork and there's no possibility of splitting an existing mapping.
32 */
33#define XFS_IEXT_ADD_NOSPLIT_CNT (1)
34
35/*
36 * Punching out an extent from the middle of an existing extent can cause the
37 * extent count to increase by 1.
38 * i.e. | Old extent | Hole | Old extent |
39 */
40#define XFS_IEXT_PUNCH_HOLE_CNT (1)
41
42/*
43 * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to
44 * be added. One extra extent for dabtree in case a local attr is
45 * large enough to cause a double split. It can also cause extent
46 * count to increase proportional to the size of a remote xattr's
47 * value.
48 */
49#define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \
50 (XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))
51
52/*
53 * A write to a sub-interval of an existing unwritten extent causes the original
54 * extent to be split into 3 extents
55 * i.e. | Unwritten | Real | Unwritten |
56 * Hence extent count can increase by 2.
57 */
58#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)
59
60
61/*
62 * Moving an extent to data fork can cause a sub-interval of an existing extent
63 * to be unmapped. This will increase extent count by 1. Mapping in the new
64 * extent can increase the extent count by 1 again i.e.
65 * | Old extent | New extent | Old extent |
66 * Hence number of extents increases by 2.
67 */
68#define XFS_IEXT_REFLINK_END_COW_CNT (2)
69
70/*
71 * Removing an initial range of source/donor file's extent and adding a new
72 * extent (from donor/source file) in its place will cause extent count to
73 * increase by 1.
74 */
75#define XFS_IEXT_SWAP_RMAP_CNT (1)
76
77/*
78 * Fork handling.
79 */
80#define XFS_IFORK_MAXEXT(ip, w) \
81 (xfs_inode_fork_size(ip, w) / sizeof(xfs_bmbt_rec_t))
82
83static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
84{
85 return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
86 ifp->if_format == XFS_DINODE_FMT_BTREE;
87}
88
89static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
90{
91 if (!ifp)
92 return 0;
93 return ifp->if_nextents;
94}
95
96static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
97{
98 if (!ifp)
99 return XFS_DINODE_FMT_EXTENTS;
100 return ifp->if_format;
101}
102
103static inline xfs_extnum_t xfs_iext_max_nextents(bool has_large_extent_counts,
104 int whichfork)
105{
106 switch (whichfork) {
107 case XFS_DATA_FORK:
108 case XFS_COW_FORK:
109 if (has_large_extent_counts)
110 return XFS_MAX_EXTCNT_DATA_FORK_LARGE;
111 return XFS_MAX_EXTCNT_DATA_FORK_SMALL;
112
113 case XFS_ATTR_FORK:
114 if (has_large_extent_counts)
115 return XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
116 return XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
117
118 default:
119 ASSERT(0);
120 return 0;
121 }
122}
123
124static inline xfs_extnum_t
125xfs_dfork_data_extents(
126 struct xfs_dinode *dip)
127{
128 if (xfs_dinode_has_large_extent_counts(dip))
129 return be64_to_cpu(dip->di_big_nextents);
130
131 return be32_to_cpu(dip->di_nextents);
132}
133
134static inline xfs_extnum_t
135xfs_dfork_attr_extents(
136 struct xfs_dinode *dip)
137{
138 if (xfs_dinode_has_large_extent_counts(dip))
139 return be32_to_cpu(dip->di_big_anextents);
140
141 return be16_to_cpu(dip->di_anextents);
142}
143
144static inline xfs_extnum_t
145xfs_dfork_nextents(
146 struct xfs_dinode *dip,
147 int whichfork)
148{
149 switch (whichfork) {
150 case XFS_DATA_FORK:
151 return xfs_dfork_data_extents(dip);
152 case XFS_ATTR_FORK:
153 return xfs_dfork_attr_extents(dip);
154 default:
155 ASSERT(0);
156 break;
157 }
158
159 return 0;
160}
161
162void xfs_ifork_zap_attr(struct xfs_inode *ip);
163void xfs_ifork_init_attr(struct xfs_inode *ip, enum xfs_dinode_fmt format,
164 xfs_extnum_t nextents);
165struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
166
167int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
168int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
169void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
170 struct xfs_inode_log_item *, int);
171void xfs_idestroy_fork(struct xfs_ifork *ifp);
172void xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
173 int whichfork);
174void xfs_iroot_realloc(struct xfs_inode *, int, int);
175int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
176int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
177 int);
178void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
179 const void *data, int64_t size);
180
181xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
182void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
183 struct xfs_bmbt_irec *, int);
184void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
185 int);
186void xfs_iext_destroy(struct xfs_ifork *);
187
188bool xfs_iext_lookup_extent(struct xfs_inode *ip,
189 struct xfs_ifork *ifp, xfs_fileoff_t bno,
190 struct xfs_iext_cursor *cur,
191 struct xfs_bmbt_irec *gotp);
192bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
193 struct xfs_ifork *ifp, xfs_fileoff_t *end,
194 struct xfs_iext_cursor *cur,
195 struct xfs_bmbt_irec *gotp);
196bool xfs_iext_get_extent(struct xfs_ifork *ifp,
197 struct xfs_iext_cursor *cur,
198 struct xfs_bmbt_irec *gotp);
199void xfs_iext_update_extent(struct xfs_inode *ip, int state,
200 struct xfs_iext_cursor *cur,
201 struct xfs_bmbt_irec *gotp);
202
203void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
204void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
205void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
206void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
207
208static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
209 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
210{
211 xfs_iext_next(ifp, cur);
212 return xfs_iext_get_extent(ifp, cur, gotp);
213}
214
215static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
216 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
217{
218 xfs_iext_prev(ifp, cur);
219 return xfs_iext_get_extent(ifp, cur, gotp);
220}
221
222/*
223 * Return the extent after cur in gotp without updating the cursor.
224 */
225static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
226 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
227{
228 struct xfs_iext_cursor ncur = *cur;
229
230 xfs_iext_next(ifp, &ncur);
231 return xfs_iext_get_extent(ifp, &ncur, gotp);
232}
233
234/*
235 * Return the extent before cur in gotp without updating the cursor.
236 */
237static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
238 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
239{
240 struct xfs_iext_cursor ncur = *cur;
241
242 xfs_iext_prev(ifp, &ncur);
243 return xfs_iext_get_extent(ifp, &ncur, gotp);
244}
245
246#define for_each_xfs_iext(ifp, ext, got) \
247 for (xfs_iext_first((ifp), (ext)); \
248 xfs_iext_get_extent((ifp), (ext), (got)); \
249 xfs_iext_next((ifp), (ext)))
250
251extern struct kmem_cache *xfs_ifork_cache;
252
253extern void xfs_ifork_init_cow(struct xfs_inode *ip);
254
255int xfs_ifork_verify_local_data(struct xfs_inode *ip);
256int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
257int xfs_iext_count_may_overflow(struct xfs_inode *ip, int whichfork,
258 int nr_to_add);
259int xfs_iext_count_upgrade(struct xfs_trans *tp, struct xfs_inode *ip,
260 uint nr_to_add);
261
262/* returns true if the fork has extents but they are not read in yet. */
263static inline bool xfs_need_iread_extents(struct xfs_ifork *ifp)
264{
265 return ifp->if_format == XFS_DINODE_FMT_BTREE && ifp->if_height == 0;
266}
267
268#endif /* __XFS_INODE_FORK_H__ */
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_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 short if_broot_bytes; /* bytes allocated for root */
25 int8_t if_format; /* format of this fork */
26 xfs_extnum_t if_nextents; /* # of extents in this fork */
27};
28
29/*
30 * Worst-case increase in the fork extent count when we're adding a single
31 * extent to a fork and there's no possibility of splitting an existing mapping.
32 */
33#define XFS_IEXT_ADD_NOSPLIT_CNT (1)
34
35/*
36 * Punching out an extent from the middle of an existing extent can cause the
37 * extent count to increase by 1.
38 * i.e. | Old extent | Hole | Old extent |
39 */
40#define XFS_IEXT_PUNCH_HOLE_CNT (1)
41
42/*
43 * Directory entry addition can cause the following,
44 * 1. Data block can be added/removed.
45 * A new extent can cause extent count to increase by 1.
46 * 2. Free disk block can be added/removed.
47 * Same behaviour as described above for Data block.
48 * 3. Dabtree blocks.
49 * XFS_DA_NODE_MAXDEPTH blocks can be added. Each of these can be new
50 * extents. Hence extent count can increase by XFS_DA_NODE_MAXDEPTH.
51 */
52#define XFS_IEXT_DIR_MANIP_CNT(mp) \
53 ((XFS_DA_NODE_MAXDEPTH + 1 + 1) * (mp)->m_dir_geo->fsbcount)
54
55/*
56 * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to
57 * be added. One extra extent for dabtree in case a local attr is
58 * large enough to cause a double split. It can also cause extent
59 * count to increase proportional to the size of a remote xattr's
60 * value.
61 */
62#define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \
63 (XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))
64
65/*
66 * A write to a sub-interval of an existing unwritten extent causes the original
67 * extent to be split into 3 extents
68 * i.e. | Unwritten | Real | Unwritten |
69 * Hence extent count can increase by 2.
70 */
71#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)
72
73
74/*
75 * Moving an extent to data fork can cause a sub-interval of an existing extent
76 * to be unmapped. This will increase extent count by 1. Mapping in the new
77 * extent can increase the extent count by 1 again i.e.
78 * | Old extent | New extent | Old extent |
79 * Hence number of extents increases by 2.
80 */
81#define XFS_IEXT_REFLINK_END_COW_CNT (2)
82
83/*
84 * Removing an initial range of source/donor file's extent and adding a new
85 * extent (from donor/source file) in its place will cause extent count to
86 * increase by 1.
87 */
88#define XFS_IEXT_SWAP_RMAP_CNT (1)
89
90/*
91 * Fork handling.
92 */
93
94#define XFS_IFORK_Q(ip) ((ip)->i_forkoff != 0)
95#define XFS_IFORK_BOFF(ip) ((int)((ip)->i_forkoff << 3))
96
97#define XFS_IFORK_PTR(ip,w) \
98 ((w) == XFS_DATA_FORK ? \
99 &(ip)->i_df : \
100 ((w) == XFS_ATTR_FORK ? \
101 (ip)->i_afp : \
102 (ip)->i_cowfp))
103#define XFS_IFORK_DSIZE(ip) \
104 (XFS_IFORK_Q(ip) ? XFS_IFORK_BOFF(ip) : XFS_LITINO((ip)->i_mount))
105#define XFS_IFORK_ASIZE(ip) \
106 (XFS_IFORK_Q(ip) ? XFS_LITINO((ip)->i_mount) - XFS_IFORK_BOFF(ip) : 0)
107#define XFS_IFORK_SIZE(ip,w) \
108 ((w) == XFS_DATA_FORK ? \
109 XFS_IFORK_DSIZE(ip) : \
110 ((w) == XFS_ATTR_FORK ? \
111 XFS_IFORK_ASIZE(ip) : \
112 0))
113#define XFS_IFORK_MAXEXT(ip, w) \
114 (XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
115
116static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
117{
118 return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
119 ifp->if_format == XFS_DINODE_FMT_BTREE;
120}
121
122static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
123{
124 if (!ifp)
125 return 0;
126 return ifp->if_nextents;
127}
128
129static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
130{
131 if (!ifp)
132 return XFS_DINODE_FMT_EXTENTS;
133 return ifp->if_format;
134}
135
136struct xfs_ifork *xfs_ifork_alloc(enum xfs_dinode_fmt format,
137 xfs_extnum_t nextents);
138struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
139
140int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
141int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
142void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
143 struct xfs_inode_log_item *, int);
144void xfs_idestroy_fork(struct xfs_ifork *ifp);
145void xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
146 int whichfork);
147void xfs_iroot_realloc(struct xfs_inode *, int, int);
148int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
149int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
150 int);
151void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
152 const void *data, int64_t size);
153
154xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
155void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
156 struct xfs_bmbt_irec *, int);
157void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
158 int);
159void xfs_iext_destroy(struct xfs_ifork *);
160
161bool xfs_iext_lookup_extent(struct xfs_inode *ip,
162 struct xfs_ifork *ifp, xfs_fileoff_t bno,
163 struct xfs_iext_cursor *cur,
164 struct xfs_bmbt_irec *gotp);
165bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
166 struct xfs_ifork *ifp, xfs_fileoff_t *end,
167 struct xfs_iext_cursor *cur,
168 struct xfs_bmbt_irec *gotp);
169bool xfs_iext_get_extent(struct xfs_ifork *ifp,
170 struct xfs_iext_cursor *cur,
171 struct xfs_bmbt_irec *gotp);
172void xfs_iext_update_extent(struct xfs_inode *ip, int state,
173 struct xfs_iext_cursor *cur,
174 struct xfs_bmbt_irec *gotp);
175
176void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
177void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
178void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
179void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
180
181static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
182 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
183{
184 xfs_iext_next(ifp, cur);
185 return xfs_iext_get_extent(ifp, cur, gotp);
186}
187
188static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
189 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
190{
191 xfs_iext_prev(ifp, cur);
192 return xfs_iext_get_extent(ifp, cur, gotp);
193}
194
195/*
196 * Return the extent after cur in gotp without updating the cursor.
197 */
198static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
199 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
200{
201 struct xfs_iext_cursor ncur = *cur;
202
203 xfs_iext_next(ifp, &ncur);
204 return xfs_iext_get_extent(ifp, &ncur, gotp);
205}
206
207/*
208 * Return the extent before cur in gotp without updating the cursor.
209 */
210static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
211 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
212{
213 struct xfs_iext_cursor ncur = *cur;
214
215 xfs_iext_prev(ifp, &ncur);
216 return xfs_iext_get_extent(ifp, &ncur, gotp);
217}
218
219#define for_each_xfs_iext(ifp, ext, got) \
220 for (xfs_iext_first((ifp), (ext)); \
221 xfs_iext_get_extent((ifp), (ext), (got)); \
222 xfs_iext_next((ifp), (ext)))
223
224extern struct kmem_zone *xfs_ifork_zone;
225
226extern void xfs_ifork_init_cow(struct xfs_inode *ip);
227
228int xfs_ifork_verify_local_data(struct xfs_inode *ip);
229int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
230int xfs_iext_count_may_overflow(struct xfs_inode *ip, int whichfork,
231 int nr_to_add);
232
233/* returns true if the fork has extents but they are not read in yet. */
234static inline bool xfs_need_iread_extents(struct xfs_ifork *ifp)
235{
236 return ifp->if_format == XFS_DINODE_FMT_BTREE && ifp->if_height == 0;
237}
238
239#endif /* __XFS_INODE_FORK_H__ */