1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
9 #include "xfs_da_format.h"
10 #include "xfs_da_btree.h"
16 struct xfs_dir2_sf_hdr;
17 struct xfs_dir2_sf_entry;
18 struct xfs_dir2_data_hdr;
19 struct xfs_dir2_data_entry;
20 struct xfs_dir2_data_unused;
21 struct xfs_dir3_icfree_hdr;
22 struct xfs_dir3_icleaf_hdr;
24 extern struct xfs_name xfs_name_dotdot;
27 * Convert inode mode to directory entry filetype
29 extern unsigned char xfs_mode_to_ftype(int mode);
32 * directory operations vector for encode/decode routines
35 int (*data_entsize)(int len);
36 uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
37 void (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
39 __be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
40 struct xfs_dir2_data_free *
41 (*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
43 xfs_dir2_data_aoff_t data_first_offset;
44 size_t data_entry_offset;
46 struct xfs_dir2_data_entry *
47 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
48 struct xfs_dir2_data_unused *
49 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
52 extern const struct xfs_dir_ops *
53 xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
56 * Generic directory interface routines
58 extern void xfs_dir_startup(void);
59 extern int xfs_da_mount(struct xfs_mount *mp);
60 extern void xfs_da_unmount(struct xfs_mount *mp);
62 extern int xfs_dir_isempty(struct xfs_inode *dp);
63 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
64 struct xfs_inode *pdp);
65 extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
66 struct xfs_name *name, xfs_ino_t inum,
68 extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
69 struct xfs_name *name, xfs_ino_t *inum,
70 struct xfs_name *ci_name);
71 extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
72 struct xfs_name *name, xfs_ino_t ino,
74 extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
75 struct xfs_name *name, xfs_ino_t inum,
77 extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
78 struct xfs_name *name);
81 * Direct call from the bmap code, bypassing the generic directory layer.
83 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
86 * Interface routines used by userspace utilities
88 extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
89 extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
90 extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
93 extern void xfs_dir2_data_freescan_int(struct xfs_da_geometry *geo,
94 const struct xfs_dir_ops *ops,
95 struct xfs_dir2_data_hdr *hdr, int *loghead);
96 extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
97 struct xfs_dir2_data_hdr *hdr, int *loghead);
98 extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
99 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
100 extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
102 extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
103 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
104 extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
105 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
106 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
107 extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
108 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
109 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
110 int *needlogp, int *needscanp);
112 extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
113 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
114 struct xfs_dir2_data_unused *dup);
116 extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
118 extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
119 extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
120 extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
121 extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
122 extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
125 * Directory offset/block conversion functions.
127 * DB blocks here are logical directory block numbers, not filesystem blocks.
131 * Convert dataptr to byte in file space
133 static inline xfs_dir2_off_t
134 xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
136 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
140 * Convert byte in file space to dataptr. It had better be aligned.
142 static inline xfs_dir2_dataptr_t
143 xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
145 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
149 * Convert byte in space to (DB) block
151 static inline xfs_dir2_db_t
152 xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
154 return (xfs_dir2_db_t)(by >> geo->blklog);
158 * Convert dataptr to a block number
160 static inline xfs_dir2_db_t
161 xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
163 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
167 * Convert byte in space to offset in a block
169 static inline xfs_dir2_data_aoff_t
170 xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
172 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
176 * Convert dataptr to a byte offset in a block
178 static inline xfs_dir2_data_aoff_t
179 xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
181 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
185 * Convert block and offset to byte in space
187 static inline xfs_dir2_off_t
188 xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
189 xfs_dir2_data_aoff_t o)
191 return ((xfs_dir2_off_t)db << geo->blklog) + o;
195 * Convert block (DB) to block (dablk)
197 static inline xfs_dablk_t
198 xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
200 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
204 * Convert byte in space to (DA) block
206 static inline xfs_dablk_t
207 xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
209 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
213 * Convert block and offset to dataptr
215 static inline xfs_dir2_dataptr_t
216 xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
217 xfs_dir2_data_aoff_t o)
219 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
223 * Convert block (dablk) to block (DB)
225 static inline xfs_dir2_db_t
226 xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
228 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
232 * Convert block (dablk) to byte offset in space
234 static inline xfs_dir2_off_t
235 xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
237 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
241 * Directory tail pointer accessor functions. Based on block geometry.
243 static inline struct xfs_dir2_block_tail *
244 xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
246 return ((struct xfs_dir2_block_tail *)
247 ((char *)hdr + geo->blksize)) - 1;
250 static inline struct xfs_dir2_leaf_tail *
251 xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
253 return (struct xfs_dir2_leaf_tail *)
254 ((char *)lp + geo->blksize -
255 sizeof(struct xfs_dir2_leaf_tail));
259 * The Linux API doesn't pass down the total size of the buffer
260 * we read into down to the filesystem. With the filldir concept
261 * it's not needed for correct information, but the XFS dir2 leaf
262 * code wants an estimate of the buffer size to calculate it's
263 * readahead window and size the buffers used for mapping to
266 * Try to give it an estimate that's good enough, maybe at some
267 * point we can change the ->readdir prototype to include the
268 * buffer size. For now we use the current glibc buffer size.
269 * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
271 #define XFS_READDIR_BUFSIZE (32768)
273 unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
274 void *xfs_dir3_data_endp(struct xfs_da_geometry *geo,
275 struct xfs_dir2_data_hdr *hdr);
276 bool xfs_dir2_namecheck(const void *name, size_t length);
278 #endif /* __XFS_DIR2_H__ */