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_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
48 struct xfs_dir2_data_entry *
49 (*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
50 struct xfs_dir2_data_entry *
51 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
52 struct xfs_dir2_data_unused *
53 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
56 extern const struct xfs_dir_ops *
57 xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
60 * Generic directory interface routines
62 extern void xfs_dir_startup(void);
63 extern int xfs_da_mount(struct xfs_mount *mp);
64 extern void xfs_da_unmount(struct xfs_mount *mp);
66 extern int xfs_dir_isempty(struct xfs_inode *dp);
67 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
68 struct xfs_inode *pdp);
69 extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
70 struct xfs_name *name, xfs_ino_t inum,
72 extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
73 struct xfs_name *name, xfs_ino_t *inum,
74 struct xfs_name *ci_name);
75 extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
76 struct xfs_name *name, xfs_ino_t ino,
78 extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
79 struct xfs_name *name, xfs_ino_t inum,
81 extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
82 struct xfs_name *name);
85 * Direct call from the bmap code, bypassing the generic directory layer.
87 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
90 * Interface routines used by userspace utilities
92 extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
93 extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
94 extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
97 extern void xfs_dir2_data_freescan_int(struct xfs_da_geometry *geo,
98 const struct xfs_dir_ops *ops,
99 struct xfs_dir2_data_hdr *hdr, int *loghead);
100 extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
101 struct xfs_dir2_data_hdr *hdr, int *loghead);
102 extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
103 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
104 extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
106 extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
107 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
108 extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
109 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
110 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
111 extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
112 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
113 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
114 int *needlogp, int *needscanp);
116 extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
117 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
118 struct xfs_dir2_data_unused *dup);
120 extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
122 extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
123 extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
124 extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
125 extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
126 extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
129 * Directory offset/block conversion functions.
131 * DB blocks here are logical directory block numbers, not filesystem blocks.
135 * Convert dataptr to byte in file space
137 static inline xfs_dir2_off_t
138 xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
140 return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
144 * Convert byte in file space to dataptr. It had better be aligned.
146 static inline xfs_dir2_dataptr_t
147 xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
149 return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
153 * Convert byte in space to (DB) block
155 static inline xfs_dir2_db_t
156 xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
158 return (xfs_dir2_db_t)(by >> geo->blklog);
162 * Convert dataptr to a block number
164 static inline xfs_dir2_db_t
165 xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
167 return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
171 * Convert byte in space to offset in a block
173 static inline xfs_dir2_data_aoff_t
174 xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
176 return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
180 * Convert dataptr to a byte offset in a block
182 static inline xfs_dir2_data_aoff_t
183 xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
185 return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
189 * Convert block and offset to byte in space
191 static inline xfs_dir2_off_t
192 xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
193 xfs_dir2_data_aoff_t o)
195 return ((xfs_dir2_off_t)db << geo->blklog) + o;
199 * Convert block (DB) to block (dablk)
201 static inline xfs_dablk_t
202 xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
204 return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
208 * Convert byte in space to (DA) block
210 static inline xfs_dablk_t
211 xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
213 return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
217 * Convert block and offset to dataptr
219 static inline xfs_dir2_dataptr_t
220 xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
221 xfs_dir2_data_aoff_t o)
223 return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
227 * Convert block (dablk) to block (DB)
229 static inline xfs_dir2_db_t
230 xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
232 return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
236 * Convert block (dablk) to byte offset in space
238 static inline xfs_dir2_off_t
239 xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
241 return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
245 * Directory tail pointer accessor functions. Based on block geometry.
247 static inline struct xfs_dir2_block_tail *
248 xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
250 return ((struct xfs_dir2_block_tail *)
251 ((char *)hdr + geo->blksize)) - 1;
254 static inline struct xfs_dir2_leaf_tail *
255 xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
257 return (struct xfs_dir2_leaf_tail *)
258 ((char *)lp + geo->blksize -
259 sizeof(struct xfs_dir2_leaf_tail));
263 * The Linux API doesn't pass down the total size of the buffer
264 * we read into down to the filesystem. With the filldir concept
265 * it's not needed for correct information, but the XFS dir2 leaf
266 * code wants an estimate of the buffer size to calculate it's
267 * readahead window and size the buffers used for mapping to
270 * Try to give it an estimate that's good enough, maybe at some
271 * point we can change the ->readdir prototype to include the
272 * buffer size. For now we use the current glibc buffer size.
273 * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
275 #define XFS_READDIR_BUFSIZE (32768)
277 unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
278 void *xfs_dir3_data_endp(struct xfs_da_geometry *geo,
279 struct xfs_dir2_data_hdr *hdr);
280 bool xfs_dir2_namecheck(const void *name, size_t length);
282 #endif /* __XFS_DIR2_H__ */