1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
16 extern kmem_zone_t *xfs_bmap_free_item_zone;
19 * Argument structure for xfs_bmap_alloc.
22 xfs_fsblock_t *firstblock; /* i/o first block allocated */
23 struct xfs_defer_ops *dfops; /* bmap freelist */
24 struct xfs_trans *tp; /* transaction pointer */
25 struct xfs_inode *ip; /* incore inode pointer */
26 struct xfs_bmbt_irec prev; /* extent before the new one */
27 struct xfs_bmbt_irec got; /* extent after, or delayed */
29 xfs_fileoff_t offset; /* offset in file filling in */
30 xfs_extlen_t length; /* i/o length asked/allocated */
31 xfs_fsblock_t blkno; /* starting block of new extent */
33 struct xfs_btree_cur *cur; /* btree cursor */
34 struct xfs_iext_cursor icur; /* incore extent cursor */
35 int nallocs;/* number of extents alloc'd */
36 int logflags;/* flags for transaction logging */
38 xfs_extlen_t total; /* total blocks needed for xaction */
39 xfs_extlen_t minlen; /* minimum allocation size (blocks) */
40 xfs_extlen_t minleft; /* amount must be left after alloc */
41 bool eof; /* set if allocating past last extent */
42 bool wasdel; /* replacing a delayed allocation */
43 bool aeof; /* allocated space at eof */
44 bool conv; /* overwriting unwritten extents */
45 int datatype;/* data type being allocated */
50 * List of extents to be free "later".
51 * The list is kept sorted on xbf_startblock.
53 struct xfs_extent_free_item
55 xfs_fsblock_t xefi_startblock;/* starting fs block number */
56 xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
57 struct list_head xefi_list;
58 struct xfs_owner_info xefi_oinfo; /* extent owner */
59 bool xefi_skip_discard;
62 #define XFS_BMAP_MAX_NMAP 4
65 * Flags for xfs_bmapi_*
67 #define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */
68 #define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
69 #define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
70 #define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
71 #define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */
72 /* combine contig. space */
73 #define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */
75 * unwritten extent conversion - this needs write cache flushing and no additional
76 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
77 * from written to unwritten, otherwise convert from unwritten to written.
79 #define XFS_BMAPI_CONVERT 0x040
82 * allocate zeroed extents - this requires all newly allocated user data extents
83 * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
84 * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
85 * during the allocation range to zeroed written extents.
87 #define XFS_BMAPI_ZERO 0x080
90 * Map the inode offset to the block given in ap->firstblock. Primarily
91 * used for reflink. The range must be in a hole, and this flag cannot be
92 * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
94 * For bunmapi, this flag unmaps the range without adjusting quota, reducing
95 * refcount, or freeing the blocks.
97 #define XFS_BMAPI_REMAP 0x100
99 /* Map something in the CoW fork. */
100 #define XFS_BMAPI_COWFORK 0x200
102 /* Only convert delalloc space, don't allocate entirely new extents */
103 #define XFS_BMAPI_DELALLOC 0x400
105 /* Only convert unwritten extents, don't allocate new blocks */
106 #define XFS_BMAPI_CONVERT_ONLY 0x800
108 /* Skip online discard of freed extents */
109 #define XFS_BMAPI_NODISCARD 0x1000
111 /* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */
112 #define XFS_BMAPI_NORMAP 0x2000
114 #define XFS_BMAPI_FLAGS \
115 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
116 { XFS_BMAPI_METADATA, "METADATA" }, \
117 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
118 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
119 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \
120 { XFS_BMAPI_CONTIG, "CONTIG" }, \
121 { XFS_BMAPI_CONVERT, "CONVERT" }, \
122 { XFS_BMAPI_ZERO, "ZERO" }, \
123 { XFS_BMAPI_REMAP, "REMAP" }, \
124 { XFS_BMAPI_COWFORK, "COWFORK" }, \
125 { XFS_BMAPI_DELALLOC, "DELALLOC" }, \
126 { XFS_BMAPI_CONVERT_ONLY, "CONVERT_ONLY" }, \
127 { XFS_BMAPI_NODISCARD, "NODISCARD" }, \
128 { XFS_BMAPI_NORMAP, "NORMAP" }
131 static inline int xfs_bmapi_aflag(int w)
133 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
134 (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
137 static inline int xfs_bmapi_whichfork(int bmapi_flags)
139 if (bmapi_flags & XFS_BMAPI_COWFORK)
141 else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
142 return XFS_ATTR_FORK;
143 return XFS_DATA_FORK;
147 * Special values for xfs_bmbt_irec_t br_startblock field.
149 #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
150 #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
153 * Flags for xfs_bmap_add_extent*.
155 #define BMAP_LEFT_CONTIG (1 << 0)
156 #define BMAP_RIGHT_CONTIG (1 << 1)
157 #define BMAP_LEFT_FILLING (1 << 2)
158 #define BMAP_RIGHT_FILLING (1 << 3)
159 #define BMAP_LEFT_DELAY (1 << 4)
160 #define BMAP_RIGHT_DELAY (1 << 5)
161 #define BMAP_LEFT_VALID (1 << 6)
162 #define BMAP_RIGHT_VALID (1 << 7)
163 #define BMAP_ATTRFORK (1 << 8)
164 #define BMAP_COWFORK (1 << 9)
166 #define XFS_BMAP_EXT_FLAGS \
167 { BMAP_LEFT_CONTIG, "LC" }, \
168 { BMAP_RIGHT_CONTIG, "RC" }, \
169 { BMAP_LEFT_FILLING, "LF" }, \
170 { BMAP_RIGHT_FILLING, "RF" }, \
171 { BMAP_ATTRFORK, "ATTR" }, \
172 { BMAP_COWFORK, "COW" }
176 * Return true if the extent is a real, allocated extent, or false if it is a
177 * delayed allocation, and unwritten extent or a hole.
179 static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
181 return irec->br_state != XFS_EXT_UNWRITTEN &&
182 irec->br_startblock != HOLESTARTBLOCK &&
183 irec->br_startblock != DELAYSTARTBLOCK &&
184 !isnullstartblock(irec->br_startblock);
187 void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
189 void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
190 int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
191 void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
192 void __xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
193 xfs_fsblock_t bno, xfs_filblks_t len,
194 struct xfs_owner_info *oinfo, bool skip_discard);
195 void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
196 int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
197 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
198 int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
199 xfs_fileoff_t *last_block, int whichfork);
200 int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
202 int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
203 int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
204 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
205 int *nmap, int flags);
206 int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
207 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
208 xfs_fsblock_t *firstblock, xfs_extlen_t total,
209 struct xfs_bmbt_irec *mval, int *nmap,
210 struct xfs_defer_ops *dfops);
211 int __xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
212 xfs_fileoff_t bno, xfs_filblks_t *rlen, int flags,
213 xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
214 struct xfs_defer_ops *dfops);
215 int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
216 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
217 xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
218 struct xfs_defer_ops *dfops, int *done);
219 int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
220 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
221 struct xfs_bmbt_irec *del);
222 void xfs_bmap_del_extent_cow(struct xfs_inode *ip,
223 struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
224 struct xfs_bmbt_irec *del);
225 uint xfs_default_attroffset(struct xfs_inode *ip);
226 int xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip,
227 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
228 bool *done, xfs_fsblock_t *firstblock,
229 struct xfs_defer_ops *dfops);
230 int xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip,
231 xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
232 bool *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock,
233 struct xfs_defer_ops *dfops);
234 int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
235 int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
236 xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
237 struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur,
242 struct xfs_mount *mp,
243 struct xfs_defer_ops *dfops,
246 struct xfs_owner_info *oinfo)
248 __xfs_bmap_add_free(mp, dfops, bno, len, oinfo, false);
251 enum xfs_bmap_intent_type {
256 struct xfs_bmap_intent {
257 struct list_head bi_list;
258 enum xfs_bmap_intent_type bi_type;
259 struct xfs_inode *bi_owner;
261 struct xfs_bmbt_irec bi_bmap;
264 int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_defer_ops *dfops,
265 struct xfs_inode *ip, enum xfs_bmap_intent_type type,
266 int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock,
267 xfs_filblks_t *blockcount, xfs_exntst_t state);
268 int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
269 struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
270 int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
271 struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
273 static inline int xfs_bmap_fork_to_state(int whichfork)
277 return BMAP_ATTRFORK;
285 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
286 struct xfs_bmbt_irec *irec);
288 int xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip,
289 xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
290 struct xfs_defer_ops *dfops, int flags);
292 #endif /* __XFS_BMAP_H__ */