fs/xfs/libxfs/xfs

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
xfs_dir2_dataptr_to_byte
xfs_dir2_byte_to_dataptr
xfs_dir2_byte_to_db
xfs_dir2_dataptr_to_db
xfs_dir2_byte_to_off
xfs_dir2_dataptr_to_off
xfs_dir2_db_off_to_byte
xfs_dir2_db_to_da
xfs_dir2_byte_to_da
xfs_dir2_db_off_to_dataptr
xfs_dir2_da_to_db
xfs_dir2_da_to_byte
xfs_dir2_block_tail_p
xfs_dir2_leaf_tail_p
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_DIR2_H__
   7 #define __XFS_DIR2_H__
   8 
   9 #include "xfs_da_format.h"
  10 #include "xfs_da_btree.h"
  11 
  12 struct xfs_da_args;
  13 struct xfs_inode;
  14 struct xfs_mount;
  15 struct xfs_trans;
  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 
  22 extern struct xfs_name  xfs_name_dotdot;
  23 
  24 /*
  25  * Convert inode mode to directory entry filetype
  26  */
  27 extern unsigned char xfs_mode_to_ftype(int mode);
  28 
  29 /*
  30  * directory operations vector for encode/decode routines
  31  */
  32 struct xfs_dir_ops {
  33         int     (*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
  34         struct xfs_dir2_sf_entry *
  35                 (*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
  36                                 struct xfs_dir2_sf_entry *sfep);
  37         uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
  38         void    (*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
  39                                 uint8_t ftype);
  40         xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
  41                                 struct xfs_dir2_sf_entry *sfep);
  42         void    (*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
  43                               struct xfs_dir2_sf_entry *sfep,
  44                               xfs_ino_t ino);
  45         xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
  46         void    (*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
  47                                      xfs_ino_t ino);
  48 
  49         int     (*data_entsize)(int len);
  50         uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
  51         void    (*data_put_ftype)(struct xfs_dir2_data_entry *dep,
  52                                 uint8_t ftype);
  53         __be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
  54         struct xfs_dir2_data_free *
  55                 (*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
  56 
  57         xfs_dir2_data_aoff_t data_dot_offset;
  58         xfs_dir2_data_aoff_t data_dotdot_offset;
  59         xfs_dir2_data_aoff_t data_first_offset;
  60         size_t  data_entry_offset;
  61 
  62         struct xfs_dir2_data_entry *
  63                 (*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
  64         struct xfs_dir2_data_entry *
  65                 (*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
  66         struct xfs_dir2_data_entry *
  67                 (*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
  68         struct xfs_dir2_data_entry *
  69                 (*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
  70         struct xfs_dir2_data_unused *
  71                 (*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
  72 
  73         int     leaf_hdr_size;
  74         void    (*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
  75                                     struct xfs_dir3_icleaf_hdr *from);
  76         void    (*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
  77                                       struct xfs_dir2_leaf *from);
  78         int     (*leaf_max_ents)(struct xfs_da_geometry *geo);
  79         struct xfs_dir2_leaf_entry *
  80                 (*leaf_ents_p)(struct xfs_dir2_leaf *lp);
  81 
  82         int     node_hdr_size;
  83         void    (*node_hdr_to_disk)(struct xfs_da_intnode *to,
  84                                     struct xfs_da3_icnode_hdr *from);
  85         void    (*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
  86                                       struct xfs_da_intnode *from);
  87         struct xfs_da_node_entry *
  88                 (*node_tree_p)(struct xfs_da_intnode *dap);
  89 
  90         int     free_hdr_size;
  91         void    (*free_hdr_to_disk)(struct xfs_dir2_free *to,
  92                                     struct xfs_dir3_icfree_hdr *from);
  93         void    (*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
  94                                       struct xfs_dir2_free *from);
  95         int     (*free_max_bests)(struct xfs_da_geometry *geo);
  96         __be16 * (*free_bests_p)(struct xfs_dir2_free *free);
  97         xfs_dir2_db_t (*db_to_fdb)(struct xfs_da_geometry *geo,
  98                                    xfs_dir2_db_t db);
  99         int     (*db_to_fdindex)(struct xfs_da_geometry *geo,
 100                                  xfs_dir2_db_t db);
 101 };
 102 
 103 extern const struct xfs_dir_ops *
 104         xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
 105 extern const struct xfs_dir_ops *
 106         xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
 107 
 108 /*
 109  * Generic directory interface routines
 110  */
 111 extern void xfs_dir_startup(void);
 112 extern int xfs_da_mount(struct xfs_mount *mp);
 113 extern void xfs_da_unmount(struct xfs_mount *mp);
 114 
 115 extern int xfs_dir_isempty(struct xfs_inode *dp);
 116 extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
 117                                 struct xfs_inode *pdp);
 118 extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
 119                                 struct xfs_name *name, xfs_ino_t inum,
 120                                 xfs_extlen_t tot);
 121 extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
 122                                 struct xfs_name *name, xfs_ino_t *inum,
 123                                 struct xfs_name *ci_name);
 124 extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
 125                                 struct xfs_name *name, xfs_ino_t ino,
 126                                 xfs_extlen_t tot);
 127 extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
 128                                 struct xfs_name *name, xfs_ino_t inum,
 129                                 xfs_extlen_t tot);
 130 extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
 131                                 struct xfs_name *name);
 132 
 133 /*
 134  * Direct call from the bmap code, bypassing the generic directory layer.
 135  */
 136 extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
 137 
 138 /*
 139  * Interface routines used by userspace utilities
 140  */
 141 extern int xfs_dir2_isblock(struct xfs_da_args *args, int *r);
 142 extern int xfs_dir2_isleaf(struct xfs_da_args *args, int *r);
 143 extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
 144                                 struct xfs_buf *bp);
 145 
 146 extern void xfs_dir2_data_freescan_int(struct xfs_da_geometry *geo,
 147                 const struct xfs_dir_ops *ops,
 148                 struct xfs_dir2_data_hdr *hdr, int *loghead);
 149 extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
 150                 struct xfs_dir2_data_hdr *hdr, int *loghead);
 151 extern void xfs_dir2_data_log_entry(struct xfs_da_args *args,
 152                 struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
 153 extern void xfs_dir2_data_log_header(struct xfs_da_args *args,
 154                 struct xfs_buf *bp);
 155 extern void xfs_dir2_data_log_unused(struct xfs_da_args *args,
 156                 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup);
 157 extern void xfs_dir2_data_make_free(struct xfs_da_args *args,
 158                 struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
 159                 xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
 160 extern int xfs_dir2_data_use_free(struct xfs_da_args *args,
 161                 struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
 162                 xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
 163                 int *needlogp, int *needscanp);
 164 
 165 extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
 166                 struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
 167                 struct xfs_dir2_data_unused *dup);
 168 
 169 extern int xfs_dir_ino_validate(struct xfs_mount *mp, xfs_ino_t ino);
 170 
 171 extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
 172 extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
 173 extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
 174 extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
 175 extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
 176 
 177 /*
 178  * Directory offset/block conversion functions.
 179  *
 180  * DB blocks here are logical directory block numbers, not filesystem blocks.
 181  */
 182 
 183 /*
 184  * Convert dataptr to byte in file space
 185  */
 186 static inline xfs_dir2_off_t
 187 xfs_dir2_dataptr_to_byte(xfs_dir2_dataptr_t dp)
 188 {
 189         return (xfs_dir2_off_t)dp << XFS_DIR2_DATA_ALIGN_LOG;
 190 }
 191 
 192 /*
 193  * Convert byte in file space to dataptr.  It had better be aligned.
 194  */
 195 static inline xfs_dir2_dataptr_t
 196 xfs_dir2_byte_to_dataptr(xfs_dir2_off_t by)
 197 {
 198         return (xfs_dir2_dataptr_t)(by >> XFS_DIR2_DATA_ALIGN_LOG);
 199 }
 200 
 201 /*
 202  * Convert byte in space to (DB) block
 203  */
 204 static inline xfs_dir2_db_t
 205 xfs_dir2_byte_to_db(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
 206 {
 207         return (xfs_dir2_db_t)(by >> geo->blklog);
 208 }
 209 
 210 /*
 211  * Convert dataptr to a block number
 212  */
 213 static inline xfs_dir2_db_t
 214 xfs_dir2_dataptr_to_db(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
 215 {
 216         return xfs_dir2_byte_to_db(geo, xfs_dir2_dataptr_to_byte(dp));
 217 }
 218 
 219 /*
 220  * Convert byte in space to offset in a block
 221  */
 222 static inline xfs_dir2_data_aoff_t
 223 xfs_dir2_byte_to_off(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
 224 {
 225         return (xfs_dir2_data_aoff_t)(by & (geo->blksize - 1));
 226 }
 227 
 228 /*
 229  * Convert dataptr to a byte offset in a block
 230  */
 231 static inline xfs_dir2_data_aoff_t
 232 xfs_dir2_dataptr_to_off(struct xfs_da_geometry *geo, xfs_dir2_dataptr_t dp)
 233 {
 234         return xfs_dir2_byte_to_off(geo, xfs_dir2_dataptr_to_byte(dp));
 235 }
 236 
 237 /*
 238  * Convert block and offset to byte in space
 239  */
 240 static inline xfs_dir2_off_t
 241 xfs_dir2_db_off_to_byte(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
 242                         xfs_dir2_data_aoff_t o)
 243 {
 244         return ((xfs_dir2_off_t)db << geo->blklog) + o;
 245 }
 246 
 247 /*
 248  * Convert block (DB) to block (dablk)
 249  */
 250 static inline xfs_dablk_t
 251 xfs_dir2_db_to_da(struct xfs_da_geometry *geo, xfs_dir2_db_t db)
 252 {
 253         return (xfs_dablk_t)(db << (geo->blklog - geo->fsblog));
 254 }
 255 
 256 /*
 257  * Convert byte in space to (DA) block
 258  */
 259 static inline xfs_dablk_t
 260 xfs_dir2_byte_to_da(struct xfs_da_geometry *geo, xfs_dir2_off_t by)
 261 {
 262         return xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, by));
 263 }
 264 
 265 /*
 266  * Convert block and offset to dataptr
 267  */
 268 static inline xfs_dir2_dataptr_t
 269 xfs_dir2_db_off_to_dataptr(struct xfs_da_geometry *geo, xfs_dir2_db_t db,
 270                            xfs_dir2_data_aoff_t o)
 271 {
 272         return xfs_dir2_byte_to_dataptr(xfs_dir2_db_off_to_byte(geo, db, o));
 273 }
 274 
 275 /*
 276  * Convert block (dablk) to block (DB)
 277  */
 278 static inline xfs_dir2_db_t
 279 xfs_dir2_da_to_db(struct xfs_da_geometry *geo, xfs_dablk_t da)
 280 {
 281         return (xfs_dir2_db_t)(da >> (geo->blklog - geo->fsblog));
 282 }
 283 
 284 /*
 285  * Convert block (dablk) to byte offset in space
 286  */
 287 static inline xfs_dir2_off_t
 288 xfs_dir2_da_to_byte(struct xfs_da_geometry *geo, xfs_dablk_t da)
 289 {
 290         return xfs_dir2_db_off_to_byte(geo, xfs_dir2_da_to_db(geo, da), 0);
 291 }
 292 
 293 /*
 294  * Directory tail pointer accessor functions. Based on block geometry.
 295  */
 296 static inline struct xfs_dir2_block_tail *
 297 xfs_dir2_block_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_data_hdr *hdr)
 298 {
 299         return ((struct xfs_dir2_block_tail *)
 300                 ((char *)hdr + geo->blksize)) - 1;
 301 }
 302 
 303 static inline struct xfs_dir2_leaf_tail *
 304 xfs_dir2_leaf_tail_p(struct xfs_da_geometry *geo, struct xfs_dir2_leaf *lp)
 305 {
 306         return (struct xfs_dir2_leaf_tail *)
 307                 ((char *)lp + geo->blksize -
 308                   sizeof(struct xfs_dir2_leaf_tail));
 309 }
 310 
 311 /*
 312  * The Linux API doesn't pass down the total size of the buffer
 313  * we read into down to the filesystem.  With the filldir concept
 314  * it's not needed for correct information, but the XFS dir2 leaf
 315  * code wants an estimate of the buffer size to calculate it's
 316  * readahead window and size the buffers used for mapping to
 317  * physical blocks.
 318  *
 319  * Try to give it an estimate that's good enough, maybe at some
 320  * point we can change the ->readdir prototype to include the
 321  * buffer size.  For now we use the current glibc buffer size.
 322  * musl libc hardcodes 2k and dietlibc uses PAGE_SIZE.
 323  */
 324 #define XFS_READDIR_BUFSIZE     (32768)
 325 
 326 unsigned char xfs_dir3_get_dtype(struct xfs_mount *mp, uint8_t filetype);
 327 void *xfs_dir3_data_endp(struct xfs_da_geometry *geo,
 328                 struct xfs_dir2_data_hdr *hdr);
 329 bool xfs_dir2_namecheck(const void *name, size_t length);
 330 
 331 #endif  /* __XFS_DIR2_H__ */
/* [<][>][^][v][top][bottom][index][help] */
root/fs/xfs/libxfs/xfs_dir2.h

INCLUDED FROM

DEFINITIONS
