2 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
3 * Copyright (c) 2013 Red Hat, Inc.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_inode.h"
32 * Shortform directory ops
36 struct xfs_dir2_sf_hdr *hdr,
39 int count = sizeof(struct xfs_dir2_sf_entry); /* namelen + offset */
41 count += len; /* name */
42 count += hdr->i8count ? sizeof(xfs_dir2_ino8_t) :
43 sizeof(xfs_dir2_ino4_t); /* ino # */
49 struct xfs_dir2_sf_hdr *hdr,
52 return xfs_dir2_sf_entsize(hdr, len) + sizeof(__uint8_t);
55 static struct xfs_dir2_sf_entry *
56 xfs_dir2_sf_nextentry(
57 struct xfs_dir2_sf_hdr *hdr,
58 struct xfs_dir2_sf_entry *sfep)
60 return (struct xfs_dir2_sf_entry *)
61 ((char *)sfep + xfs_dir2_sf_entsize(hdr, sfep->namelen));
64 static struct xfs_dir2_sf_entry *
65 xfs_dir3_sf_nextentry(
66 struct xfs_dir2_sf_hdr *hdr,
67 struct xfs_dir2_sf_entry *sfep)
69 return (struct xfs_dir2_sf_entry *)
70 ((char *)sfep + xfs_dir3_sf_entsize(hdr, sfep->namelen));
75 * For filetype enabled shortform directories, the file type field is stored at
76 * the end of the name. Because it's only a single byte, endian conversion is
77 * not necessary. For non-filetype enable directories, the type is always
78 * unknown and we never store the value.
81 xfs_dir2_sfe_get_ftype(
82 struct xfs_dir2_sf_entry *sfep)
84 return XFS_DIR3_FT_UNKNOWN;
88 xfs_dir2_sfe_put_ftype(
89 struct xfs_dir2_sf_entry *sfep,
92 ASSERT(ftype < XFS_DIR3_FT_MAX);
96 xfs_dir3_sfe_get_ftype(
97 struct xfs_dir2_sf_entry *sfep)
101 ftype = sfep->name[sfep->namelen];
102 if (ftype >= XFS_DIR3_FT_MAX)
103 return XFS_DIR3_FT_UNKNOWN;
108 xfs_dir3_sfe_put_ftype(
109 struct xfs_dir2_sf_entry *sfep,
112 ASSERT(ftype < XFS_DIR3_FT_MAX);
114 sfep->name[sfep->namelen] = ftype;
118 * Inode numbers in short-form directories can come in two versions,
119 * either 4 bytes or 8 bytes wide. These helpers deal with the
120 * two forms transparently by looking at the headers i8count field.
122 * For 64-bit inode number the most significant byte must be zero.
126 struct xfs_dir2_sf_hdr *hdr,
127 xfs_dir2_inou_t *from)
130 return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
132 return get_unaligned_be32(&from->i4.i);
137 struct xfs_dir2_sf_hdr *hdr,
141 ASSERT((ino & 0xff00000000000000ULL) == 0);
144 put_unaligned_be64(ino, &to->i8.i);
146 put_unaligned_be32(ino, &to->i4.i);
150 xfs_dir2_sf_get_parent_ino(
151 struct xfs_dir2_sf_hdr *hdr)
153 return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
157 xfs_dir2_sf_put_parent_ino(
158 struct xfs_dir2_sf_hdr *hdr,
161 xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
165 * In short-form directory entries the inode numbers are stored at variable
166 * offset behind the entry name. If the entry stores a filetype value, then it
167 * sits between the name and the inode number. Hence the inode numbers may only
168 * be accessed through the helpers below.
171 xfs_dir2_sfe_get_ino(
172 struct xfs_dir2_sf_hdr *hdr,
173 struct xfs_dir2_sf_entry *sfep)
175 return xfs_dir2_sf_get_ino(hdr,
176 (xfs_dir2_inou_t *)&sfep->name[sfep->namelen]);
180 xfs_dir2_sfe_put_ino(
181 struct xfs_dir2_sf_hdr *hdr,
182 struct xfs_dir2_sf_entry *sfep,
185 xfs_dir2_sf_put_ino(hdr,
186 (xfs_dir2_inou_t *)&sfep->name[sfep->namelen], ino);
190 xfs_dir3_sfe_get_ino(
191 struct xfs_dir2_sf_hdr *hdr,
192 struct xfs_dir2_sf_entry *sfep)
194 return xfs_dir2_sf_get_ino(hdr,
195 (xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1]);
199 xfs_dir3_sfe_put_ino(
200 struct xfs_dir2_sf_hdr *hdr,
201 struct xfs_dir2_sf_entry *sfep,
204 xfs_dir2_sf_put_ino(hdr,
205 (xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1], ino);
210 * Directory data block operations
213 __xfs_dir3_data_entsize(
217 int size = offsetof(struct xfs_dir2_data_entry, name[0]);
220 size += sizeof(xfs_dir2_data_off_t);
222 size += sizeof(__uint8_t);
223 return roundup(size, XFS_DIR2_DATA_ALIGN);
227 xfs_dir2_data_entsize(
230 return __xfs_dir3_data_entsize(false, n);
233 xfs_dir3_data_entsize(
236 return __xfs_dir3_data_entsize(true, n);
240 xfs_dir2_data_get_ftype(
241 struct xfs_dir2_data_entry *dep)
243 return XFS_DIR3_FT_UNKNOWN;
247 xfs_dir2_data_put_ftype(
248 struct xfs_dir2_data_entry *dep,
251 ASSERT(ftype < XFS_DIR3_FT_MAX);
255 xfs_dir3_data_get_ftype(
256 struct xfs_dir2_data_entry *dep)
258 __uint8_t ftype = dep->name[dep->namelen];
260 ASSERT(ftype < XFS_DIR3_FT_MAX);
261 if (ftype >= XFS_DIR3_FT_MAX)
262 return XFS_DIR3_FT_UNKNOWN;
267 xfs_dir3_data_put_ftype(
268 struct xfs_dir2_data_entry *dep,
271 ASSERT(type < XFS_DIR3_FT_MAX);
272 ASSERT(dep->namelen != 0);
274 dep->name[dep->namelen] = type;
278 * Pointer to an entry's tag word.
281 xfs_dir2_data_entry_tag_p(
282 struct xfs_dir2_data_entry *dep)
284 return (__be16 *)((char *)dep +
285 xfs_dir2_data_entsize(dep->namelen) - sizeof(__be16));
289 xfs_dir3_data_entry_tag_p(
290 struct xfs_dir2_data_entry *dep)
292 return (__be16 *)((char *)dep +
293 xfs_dir3_data_entsize(dep->namelen) - sizeof(__be16));
297 * Offsets of . and .. in data space (always block 0)
299 static xfs_dir2_data_aoff_t
300 xfs_dir2_data_dot_offset(void)
302 return sizeof(struct xfs_dir2_data_hdr);
305 static xfs_dir2_data_aoff_t
306 xfs_dir2_data_dotdot_offset(void)
308 return xfs_dir2_data_dot_offset() + xfs_dir2_data_entsize(1);
311 static xfs_dir2_data_aoff_t
312 xfs_dir2_data_first_offset(void)
314 return xfs_dir2_data_dotdot_offset() + xfs_dir2_data_entsize(2);
317 static xfs_dir2_data_aoff_t
318 xfs_dir3_data_dot_offset(void)
320 return sizeof(struct xfs_dir3_data_hdr);
323 static xfs_dir2_data_aoff_t
324 xfs_dir3_data_dotdot_offset(void)
326 return xfs_dir3_data_dot_offset() + xfs_dir3_data_entsize(1);
329 static xfs_dir2_data_aoff_t
330 xfs_dir3_data_first_offset(void)
332 return xfs_dir3_data_dotdot_offset() + xfs_dir3_data_entsize(2);
336 * location of . and .. in data space (always block 0)
338 static struct xfs_dir2_data_entry *
339 xfs_dir2_data_dot_entry_p(
340 struct xfs_dir2_data_hdr *hdr)
342 return (struct xfs_dir2_data_entry *)
343 ((char *)hdr + xfs_dir2_data_dot_offset());
346 static struct xfs_dir2_data_entry *
347 xfs_dir2_data_dotdot_entry_p(
348 struct xfs_dir2_data_hdr *hdr)
350 return (struct xfs_dir2_data_entry *)
351 ((char *)hdr + xfs_dir2_data_dotdot_offset());
354 static struct xfs_dir2_data_entry *
355 xfs_dir2_data_first_entry_p(
356 struct xfs_dir2_data_hdr *hdr)
358 return (struct xfs_dir2_data_entry *)
359 ((char *)hdr + xfs_dir2_data_first_offset());
362 static struct xfs_dir2_data_entry *
363 xfs_dir3_data_dot_entry_p(
364 struct xfs_dir2_data_hdr *hdr)
366 return (struct xfs_dir2_data_entry *)
367 ((char *)hdr + xfs_dir3_data_dot_offset());
370 static struct xfs_dir2_data_entry *
371 xfs_dir3_data_dotdot_entry_p(
372 struct xfs_dir2_data_hdr *hdr)
374 return (struct xfs_dir2_data_entry *)
375 ((char *)hdr + xfs_dir3_data_dotdot_offset());
378 static struct xfs_dir2_data_entry *
379 xfs_dir3_data_first_entry_p(
380 struct xfs_dir2_data_hdr *hdr)
382 return (struct xfs_dir2_data_entry *)
383 ((char *)hdr + xfs_dir3_data_first_offset());
386 const struct xfs_dir_ops xfs_dir2_ops = {
387 .sf_entsize = xfs_dir2_sf_entsize,
388 .sf_nextentry = xfs_dir2_sf_nextentry,
389 .sf_get_ftype = xfs_dir2_sfe_get_ftype,
390 .sf_put_ftype = xfs_dir2_sfe_put_ftype,
391 .sf_get_ino = xfs_dir2_sfe_get_ino,
392 .sf_put_ino = xfs_dir2_sfe_put_ino,
393 .sf_get_parent_ino = xfs_dir2_sf_get_parent_ino,
394 .sf_put_parent_ino = xfs_dir2_sf_put_parent_ino,
396 .data_entsize = xfs_dir2_data_entsize,
397 .data_get_ftype = xfs_dir2_data_get_ftype,
398 .data_put_ftype = xfs_dir2_data_put_ftype,
399 .data_entry_tag_p = xfs_dir2_data_entry_tag_p,
401 .data_dot_offset = xfs_dir2_data_dot_offset,
402 .data_dotdot_offset = xfs_dir2_data_dotdot_offset,
403 .data_first_offset = xfs_dir2_data_first_offset,
404 .data_dot_entry_p = xfs_dir2_data_dot_entry_p,
405 .data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p,
406 .data_first_entry_p = xfs_dir2_data_first_entry_p,
409 const struct xfs_dir_ops xfs_dir2_ftype_ops = {
410 .sf_entsize = xfs_dir3_sf_entsize,
411 .sf_nextentry = xfs_dir3_sf_nextentry,
412 .sf_get_ftype = xfs_dir3_sfe_get_ftype,
413 .sf_put_ftype = xfs_dir3_sfe_put_ftype,
414 .sf_get_ino = xfs_dir3_sfe_get_ino,
415 .sf_put_ino = xfs_dir3_sfe_put_ino,
416 .sf_get_parent_ino = xfs_dir2_sf_get_parent_ino,
417 .sf_put_parent_ino = xfs_dir2_sf_put_parent_ino,
419 .data_entsize = xfs_dir3_data_entsize,
420 .data_get_ftype = xfs_dir3_data_get_ftype,
421 .data_put_ftype = xfs_dir3_data_put_ftype,
422 .data_entry_tag_p = xfs_dir3_data_entry_tag_p,
424 .data_dot_offset = xfs_dir2_data_dot_offset,
425 .data_dotdot_offset = xfs_dir2_data_dotdot_offset,
426 .data_first_offset = xfs_dir2_data_first_offset,
427 .data_dot_entry_p = xfs_dir2_data_dot_entry_p,
428 .data_dotdot_entry_p = xfs_dir2_data_dotdot_entry_p,
429 .data_first_entry_p = xfs_dir2_data_first_entry_p,
432 const struct xfs_dir_ops xfs_dir3_ops = {
433 .sf_entsize = xfs_dir3_sf_entsize,
434 .sf_nextentry = xfs_dir3_sf_nextentry,
435 .sf_get_ftype = xfs_dir3_sfe_get_ftype,
436 .sf_put_ftype = xfs_dir3_sfe_put_ftype,
437 .sf_get_ino = xfs_dir3_sfe_get_ino,
438 .sf_put_ino = xfs_dir3_sfe_put_ino,
439 .sf_get_parent_ino = xfs_dir2_sf_get_parent_ino,
440 .sf_put_parent_ino = xfs_dir2_sf_put_parent_ino,
442 .data_entsize = xfs_dir3_data_entsize,
443 .data_get_ftype = xfs_dir3_data_get_ftype,
444 .data_put_ftype = xfs_dir3_data_put_ftype,
445 .data_entry_tag_p = xfs_dir3_data_entry_tag_p,
447 .data_dot_offset = xfs_dir3_data_dot_offset,
448 .data_dotdot_offset = xfs_dir3_data_dotdot_offset,
449 .data_first_offset = xfs_dir3_data_first_offset,
450 .data_dot_entry_p = xfs_dir3_data_dot_entry_p,
451 .data_dotdot_entry_p = xfs_dir3_data_dotdot_entry_p,
452 .data_first_entry_p = xfs_dir3_data_first_entry_p,