1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_trans.h"
15#include "xfs_bmap.h"
16#include "xfs_dir2.h"
17#include "xfs_dir2_priv.h"
18#include "xfs_errortag.h"
19#include "xfs_error.h"
20#include "xfs_trace.h"
21#include "xfs_health.h"
22
23const struct xfs_name xfs_name_dotdot = {
24	.name	= (const unsigned char *)"..",
25	.len	= 2,
26	.type	= XFS_DIR3_FT_DIR,
27};
28
29const struct xfs_name xfs_name_dot = {
30	.name	= (const unsigned char *)".",
31	.len	= 1,
32	.type	= XFS_DIR3_FT_DIR,
33};
34
35/*
36 * Convert inode mode to directory entry filetype
37 */
38unsigned char
39xfs_mode_to_ftype(
40	int		mode)
41{
42	switch (mode & S_IFMT) {
43	case S_IFREG:
44		return XFS_DIR3_FT_REG_FILE;
45	case S_IFDIR:
46		return XFS_DIR3_FT_DIR;
47	case S_IFCHR:
48		return XFS_DIR3_FT_CHRDEV;
49	case S_IFBLK:
50		return XFS_DIR3_FT_BLKDEV;
51	case S_IFIFO:
52		return XFS_DIR3_FT_FIFO;
53	case S_IFSOCK:
54		return XFS_DIR3_FT_SOCK;
55	case S_IFLNK:
56		return XFS_DIR3_FT_SYMLINK;
57	default:
58		return XFS_DIR3_FT_UNKNOWN;
59	}
60}
61
62/*
63 * ASCII case-insensitive (ie. A-Z) support for directories that was
64 * used in IRIX.
65 */
66xfs_dahash_t
67xfs_ascii_ci_hashname(
68	const struct xfs_name	*name)
69{
70	xfs_dahash_t		hash;
71	int			i;
72
73	for (i = 0, hash = 0; i < name->len; i++)
74		hash = xfs_ascii_ci_xfrm(name->name[i]) ^ rol32(hash, 7);
75
76	return hash;
77}
78
79enum xfs_dacmp
80xfs_ascii_ci_compname(
81	struct xfs_da_args	*args,
82	const unsigned char	*name,
83	int			len)
84{
85	enum xfs_dacmp		result;
86	int			i;
87
88	if (args->namelen != len)
89		return XFS_CMP_DIFFERENT;
90
91	result = XFS_CMP_EXACT;
92	for (i = 0; i < len; i++) {
93		if (args->name[i] == name[i])
94			continue;
95		if (xfs_ascii_ci_xfrm(args->name[i]) !=
96		    xfs_ascii_ci_xfrm(name[i]))
97			return XFS_CMP_DIFFERENT;
98		result = XFS_CMP_CASE;
99	}
100
101	return result;
102}
103
104int
105xfs_da_mount(
106	struct xfs_mount	*mp)
107{
108	struct xfs_da_geometry	*dageo;
109
110
111	ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
112	ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE);
113
114	mp->m_dir_geo = kzalloc(sizeof(struct xfs_da_geometry),
115				GFP_KERNEL | __GFP_RETRY_MAYFAIL);
116	mp->m_attr_geo = kzalloc(sizeof(struct xfs_da_geometry),
117				GFP_KERNEL | __GFP_RETRY_MAYFAIL);
118	if (!mp->m_dir_geo || !mp->m_attr_geo) {
119		kfree(mp->m_dir_geo);
120		kfree(mp->m_attr_geo);
121		return -ENOMEM;
122	}
123
124	/* set up directory geometry */
125	dageo = mp->m_dir_geo;
126	dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog;
127	dageo->fsblog = mp->m_sb.sb_blocklog;
128	dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb);
129	dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog;
130	if (xfs_has_crc(mp)) {
131		dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr);
132		dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr);
133		dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr);
134		dageo->data_entry_offset =
135				sizeof(struct xfs_dir3_data_hdr);
136	} else {
137		dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr);
138		dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr);
139		dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr);
140		dageo->data_entry_offset =
141				sizeof(struct xfs_dir2_data_hdr);
142	}
143	dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) /
144			sizeof(struct xfs_dir2_leaf_entry);
145	dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) /
146			sizeof(xfs_dir2_data_off_t);
147
148	dageo->data_first_offset = dageo->data_entry_offset +
149			xfs_dir2_data_entsize(mp, 1) +
150			xfs_dir2_data_entsize(mp, 2);
151
152	/*
153	 * Now we've set up the block conversion variables, we can calculate the
154	 * segment block constants using the geometry structure.
155	 */
156	dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET);
157	dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET);
158	dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET);
159	dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
160				(uint)sizeof(xfs_da_node_entry_t);
161	dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >>
162					mp->m_sb.sb_blocklog;
163	dageo->magicpct = (dageo->blksize * 37) / 100;
164
165	/* set up attribute geometry - single fsb only */
166	dageo = mp->m_attr_geo;
167	dageo->blklog = mp->m_sb.sb_blocklog;
168	dageo->fsblog = mp->m_sb.sb_blocklog;
169	dageo->blksize = 1 << dageo->blklog;
170	dageo->fsbcount = 1;
171	dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size;
172	dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) /
173				(uint)sizeof(xfs_da_node_entry_t);
174
175	if (xfs_has_large_extent_counts(mp))
176		dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE;
177	else
178		dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL;
179
180	dageo->magicpct = (dageo->blksize * 37) / 100;
181	return 0;
182}
183
184void
185xfs_da_unmount(
186	struct xfs_mount	*mp)
187{
188	kfree(mp->m_dir_geo);
189	kfree(mp->m_attr_geo);
190}
191
192/*
193 * Return 1 if directory contains only "." and "..".
194 */
195int
196xfs_dir_isempty(
197	xfs_inode_t	*dp)
198{
199	xfs_dir2_sf_hdr_t	*sfp;
200
201	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
202	if (dp->i_disk_size == 0)	/* might happen during shutdown. */
203		return 1;
204	if (dp->i_disk_size > xfs_inode_data_fork_size(dp))
205		return 0;
206	sfp = dp->i_df.if_data;
207	return !sfp->count;
208}
209
210/*
211 * Validate a given inode number.
212 */
213int
214xfs_dir_ino_validate(
215	xfs_mount_t	*mp,
216	xfs_ino_t	ino)
217{
218	bool		ino_ok = xfs_verify_dir_ino(mp, ino);
219
220	if (XFS_IS_CORRUPT(mp, !ino_ok) ||
221	    XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) {
222		xfs_warn(mp, "Invalid inode number 0x%Lx",
223				(unsigned long long) ino);
224		return -EFSCORRUPTED;
225	}
226	return 0;
227}
228
229/*
230 * Initialize a directory with its "." and ".." entries.
231 */
232int
233xfs_dir_init(
234	xfs_trans_t	*tp,
235	xfs_inode_t	*dp,
236	xfs_inode_t	*pdp)
237{
238	struct xfs_da_args *args;
239	int		error;
240
241	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
242	error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino);
243	if (error)
244		return error;
245
246	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
247	if (!args)
248		return -ENOMEM;
249
250	args->geo = dp->i_mount->m_dir_geo;
251	args->dp = dp;
252	args->trans = tp;
253	error = xfs_dir2_sf_create(args, pdp->i_ino);
254	kfree(args);
255	return error;
256}
257
258/*
259 * Enter a name in a directory, or check for available space.
260 * If inum is 0, only the available space test is performed.
261 */
262int
263xfs_dir_createname(
264	struct xfs_trans	*tp,
265	struct xfs_inode	*dp,
266	const struct xfs_name	*name,
267	xfs_ino_t		inum,		/* new entry inode number */
268	xfs_extlen_t		total)		/* bmap's total block count */
269{
270	struct xfs_da_args	*args;
271	int			rval;
272	bool			v;
273
274	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
275
276	if (inum) {
277		rval = xfs_dir_ino_validate(tp->t_mountp, inum);
278		if (rval)
279			return rval;
280		XFS_STATS_INC(dp->i_mount, xs_dir_create);
281	}
282
283	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
284	if (!args)
285		return -ENOMEM;
286
287	args->geo = dp->i_mount->m_dir_geo;
288	args->name = name->name;
289	args->namelen = name->len;
290	args->filetype = name->type;
291	args->hashval = xfs_dir2_hashname(dp->i_mount, name);
292	args->inumber = inum;
293	args->dp = dp;
294	args->total = total;
295	args->whichfork = XFS_DATA_FORK;
296	args->trans = tp;
297	args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
298	if (!inum)
299		args->op_flags |= XFS_DA_OP_JUSTCHECK;
300
301	if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
302		rval = xfs_dir2_sf_addname(args);
303		goto out_free;
304	}
305
306	rval = xfs_dir2_isblock(args, &v);
307	if (rval)
308		goto out_free;
309	if (v) {
310		rval = xfs_dir2_block_addname(args);
311		goto out_free;
312	}
313
314	rval = xfs_dir2_isleaf(args, &v);
315	if (rval)
316		goto out_free;
317	if (v)
318		rval = xfs_dir2_leaf_addname(args);
319	else
320		rval = xfs_dir2_node_addname(args);
321
322out_free:
323	kfree(args);
324	return rval;
325}
326
327/*
328 * If doing a CI lookup and case-insensitive match, dup actual name into
329 * args.value. Return EEXIST for success (ie. name found) or an error.
330 */
331int
332xfs_dir_cilookup_result(
333	struct xfs_da_args *args,
334	const unsigned char *name,
335	int		len)
336{
337	if (args->cmpresult == XFS_CMP_DIFFERENT)
338		return -ENOENT;
339	if (args->cmpresult != XFS_CMP_CASE ||
340					!(args->op_flags & XFS_DA_OP_CILOOKUP))
341		return -EEXIST;
342
343	args->value = kmalloc(len,
344			GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_RETRY_MAYFAIL);
345	if (!args->value)
346		return -ENOMEM;
347
348	memcpy(args->value, name, len);
349	args->valuelen = len;
350	return -EEXIST;
351}
352
353/*
354 * Lookup a name in a directory, give back the inode number.
355 * If ci_name is not NULL, returns the actual name in ci_name if it differs
356 * to name, or ci_name->name is set to NULL for an exact match.
357 */
358
359int
360xfs_dir_lookup(
361	struct xfs_trans	*tp,
362	struct xfs_inode	*dp,
363	const struct xfs_name	*name,
364	xfs_ino_t		*inum,	  /* out: inode number */
365	struct xfs_name		*ci_name) /* out: actual name if CI match */
366{
367	struct xfs_da_args	*args;
368	int			rval;
369	bool			v;
370	int			lock_mode;
371
372	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
373	XFS_STATS_INC(dp->i_mount, xs_dir_lookup);
374
375	args = kzalloc(sizeof(*args),
376			GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
377	args->geo = dp->i_mount->m_dir_geo;
378	args->name = name->name;
379	args->namelen = name->len;
380	args->filetype = name->type;
381	args->hashval = xfs_dir2_hashname(dp->i_mount, name);
382	args->dp = dp;
383	args->whichfork = XFS_DATA_FORK;
384	args->trans = tp;
385	args->op_flags = XFS_DA_OP_OKNOENT;
386	if (ci_name)
387		args->op_flags |= XFS_DA_OP_CILOOKUP;
388
389	lock_mode = xfs_ilock_data_map_shared(dp);
390	if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
391		rval = xfs_dir2_sf_lookup(args);
392		goto out_check_rval;
393	}
394
395	rval = xfs_dir2_isblock(args, &v);
396	if (rval)
397		goto out_free;
398	if (v) {
399		rval = xfs_dir2_block_lookup(args);
400		goto out_check_rval;
401	}
402
403	rval = xfs_dir2_isleaf(args, &v);
404	if (rval)
405		goto out_free;
406	if (v)
407		rval = xfs_dir2_leaf_lookup(args);
408	else
409		rval = xfs_dir2_node_lookup(args);
410
411out_check_rval:
412	if (rval == -EEXIST)
413		rval = 0;
414	if (!rval) {
415		*inum = args->inumber;
416		if (ci_name) {
417			ci_name->name = args->value;
418			ci_name->len = args->valuelen;
419		}
420	}
421out_free:
422	xfs_iunlock(dp, lock_mode);
423	kfree(args);
424	return rval;
425}
426
427/*
428 * Remove an entry from a directory.
429 */
430int
431xfs_dir_removename(
432	struct xfs_trans	*tp,
433	struct xfs_inode	*dp,
434	struct xfs_name		*name,
435	xfs_ino_t		ino,
436	xfs_extlen_t		total)		/* bmap's total block count */
437{
438	struct xfs_da_args	*args;
439	int			rval;
440	bool			v;
441
442	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
443	XFS_STATS_INC(dp->i_mount, xs_dir_remove);
444
445	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
446	if (!args)
447		return -ENOMEM;
448
449	args->geo = dp->i_mount->m_dir_geo;
450	args->name = name->name;
451	args->namelen = name->len;
452	args->filetype = name->type;
453	args->hashval = xfs_dir2_hashname(dp->i_mount, name);
454	args->inumber = ino;
455	args->dp = dp;
456	args->total = total;
457	args->whichfork = XFS_DATA_FORK;
458	args->trans = tp;
459
460	if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
461		rval = xfs_dir2_sf_removename(args);
462		goto out_free;
463	}
464
465	rval = xfs_dir2_isblock(args, &v);
466	if (rval)
467		goto out_free;
468	if (v) {
469		rval = xfs_dir2_block_removename(args);
470		goto out_free;
471	}
472
473	rval = xfs_dir2_isleaf(args, &v);
474	if (rval)
475		goto out_free;
476	if (v)
477		rval = xfs_dir2_leaf_removename(args);
478	else
479		rval = xfs_dir2_node_removename(args);
480out_free:
481	kfree(args);
482	return rval;
483}
484
485/*
486 * Replace the inode number of a directory entry.
487 */
488int
489xfs_dir_replace(
490	struct xfs_trans	*tp,
491	struct xfs_inode	*dp,
492	const struct xfs_name	*name,		/* name of entry to replace */
493	xfs_ino_t		inum,		/* new inode number */
494	xfs_extlen_t		total)		/* bmap's total block count */
495{
496	struct xfs_da_args	*args;
497	int			rval;
498	bool			v;
499
500	ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
501
502	rval = xfs_dir_ino_validate(tp->t_mountp, inum);
503	if (rval)
504		return rval;
505
506	args = kzalloc(sizeof(*args), GFP_KERNEL | __GFP_NOFAIL);
507	if (!args)
508		return -ENOMEM;
509
510	args->geo = dp->i_mount->m_dir_geo;
511	args->name = name->name;
512	args->namelen = name->len;
513	args->filetype = name->type;
514	args->hashval = xfs_dir2_hashname(dp->i_mount, name);
515	args->inumber = inum;
516	args->dp = dp;
517	args->total = total;
518	args->whichfork = XFS_DATA_FORK;
519	args->trans = tp;
520
521	if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
522		rval = xfs_dir2_sf_replace(args);
523		goto out_free;
524	}
525
526	rval = xfs_dir2_isblock(args, &v);
527	if (rval)
528		goto out_free;
529	if (v) {
530		rval = xfs_dir2_block_replace(args);
531		goto out_free;
532	}
533
534	rval = xfs_dir2_isleaf(args, &v);
535	if (rval)
536		goto out_free;
537	if (v)
538		rval = xfs_dir2_leaf_replace(args);
539	else
540		rval = xfs_dir2_node_replace(args);
541out_free:
542	kfree(args);
543	return rval;
544}
545
546/*
547 * See if this entry can be added to the directory without allocating space.
548 */
549int
550xfs_dir_canenter(
551	xfs_trans_t	*tp,
552	xfs_inode_t	*dp,
553	struct xfs_name	*name)		/* name of entry to add */
554{
555	return xfs_dir_createname(tp, dp, name, 0, 0);
556}
557
558/*
559 * Utility routines.
560 */
561
562/*
563 * Add a block to the directory.
564 *
565 * This routine is for data and free blocks, not leaf/node blocks which are
566 * handled by xfs_da_grow_inode.
567 */
568int
569xfs_dir2_grow_inode(
570	struct xfs_da_args	*args,
571	int			space,	/* v2 dir's space XFS_DIR2_xxx_SPACE */
572	xfs_dir2_db_t		*dbp)	/* out: block number added */
573{
574	struct xfs_inode	*dp = args->dp;
575	struct xfs_mount	*mp = dp->i_mount;
576	xfs_fileoff_t		bno;	/* directory offset of new block */
577	int			count;	/* count of filesystem blocks */
578	int			error;
579
580	trace_xfs_dir2_grow_inode(args, space);
581
582	/*
583	 * Set lowest possible block in the space requested.
584	 */
585	bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
586	count = args->geo->fsbcount;
587
588	error = xfs_da_grow_inode_int(args, &bno, count);
589	if (error)
590		return error;
591
592	*dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno);
593
594	/*
595	 * Update file's size if this is the data space and it grew.
596	 */
597	if (space == XFS_DIR2_DATA_SPACE) {
598		xfs_fsize_t	size;		/* directory file (data) size */
599
600		size = XFS_FSB_TO_B(mp, bno + count);
601		if (size > dp->i_disk_size) {
602			dp->i_disk_size = size;
603			xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
604		}
605	}
606	return 0;
607}
608
609/*
610 * See if the directory is a single-block form directory.
611 */
612int
613xfs_dir2_isblock(
614	struct xfs_da_args	*args,
615	bool			*isblock)
616{
617	struct xfs_mount	*mp = args->dp->i_mount;
618	xfs_fileoff_t		eof;
619	int			error;
620
621	error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
622	if (error)
623		return error;
624
625	*isblock = false;
626	if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize)
627		return 0;
628
629	*isblock = true;
630	if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize)) {
631		xfs_da_mark_sick(args);
632		return -EFSCORRUPTED;
633	}
634	return 0;
635}
636
637/*
638 * See if the directory is a single-leaf form directory.
639 */
640int
641xfs_dir2_isleaf(
642	struct xfs_da_args	*args,
643	bool			*isleaf)
644{
645	xfs_fileoff_t		eof;
646	int			error;
647
648	error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK);
649	if (error)
650		return error;
651
652	*isleaf = false;
653	if (eof != args->geo->leafblk + args->geo->fsbcount)
654		return 0;
655
656	*isleaf = true;
657	return 0;
658}
659
660/*
661 * Remove the given block from the directory.
662 * This routine is used for data and free blocks, leaf/node are done
663 * by xfs_da_shrink_inode.
664 */
665int
666xfs_dir2_shrink_inode(
667	struct xfs_da_args	*args,
668	xfs_dir2_db_t		db,
669	struct xfs_buf		*bp)
670{
671	xfs_fileoff_t		bno;		/* directory file offset */
672	xfs_dablk_t		da;		/* directory file offset */
673	int			done;		/* bunmap is finished */
674	struct xfs_inode	*dp;
675	int			error;
676	struct xfs_mount	*mp;
677	struct xfs_trans	*tp;
678
679	trace_xfs_dir2_shrink_inode(args, db);
680
681	dp = args->dp;
682	mp = dp->i_mount;
683	tp = args->trans;
684	da = xfs_dir2_db_to_da(args->geo, db);
685
686	/* Unmap the fsblock(s). */
687	error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done);
688	if (error) {
689		/*
690		 * ENOSPC actually can happen if we're in a removename with no
691		 * space reservation, and the resulting block removal would
692		 * cause a bmap btree split or conversion from extents to btree.
693		 * This can only happen for un-fragmented directory blocks,
694		 * since you need to be punching out the middle of an extent.
695		 * In this case we need to leave the block in the file, and not
696		 * binval it.  So the block has to be in a consistent empty
697		 * state and appropriately logged.  We don't free up the buffer,
698		 * the caller can tell it hasn't happened since it got an error
699		 * back.
700		 */
701		return error;
702	}
703	ASSERT(done);
704	/*
705	 * Invalidate the buffer from the transaction.
706	 */
707	xfs_trans_binval(tp, bp);
708	/*
709	 * If it's not a data block, we're done.
710	 */
711	if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET))
712		return 0;
713	/*
714	 * If the block isn't the last one in the directory, we're done.
715	 */
716	if (dp->i_disk_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0))
717		return 0;
718	bno = da;
719	if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
720		/*
721		 * This can't really happen unless there's kernel corruption.
722		 */
723		return error;
724	}
725	if (db == args->geo->datablk)
726		ASSERT(bno == 0);
727	else
728		ASSERT(bno > 0);
729	/*
730	 * Set the size to the new last block.
731	 */
732	dp->i_disk_size = XFS_FSB_TO_B(mp, bno);
733	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
734	return 0;
735}
736
737/* Returns true if the directory entry name is valid. */
738bool
739xfs_dir2_namecheck(
740	const void	*name,
741	size_t		length)
742{
743	/*
744	 * MAXNAMELEN includes the trailing null, but (name/length) leave it
745	 * out, so use >= for the length check.
746	 */
747	if (length >= MAXNAMELEN)
748		return false;
749
750	/* There shouldn't be any slashes or nulls here */
751	return !memchr(name, '/', length) && !memchr(name, 0, length);
752}
753
754xfs_dahash_t
755xfs_dir2_hashname(
756	struct xfs_mount	*mp,
757	const struct xfs_name	*name)
758{
759	if (unlikely(xfs_has_asciici(mp)))
760		return xfs_ascii_ci_hashname(name);
761	return xfs_da_hashname(name->name, name->len);
762}
763
764enum xfs_dacmp
765xfs_dir2_compname(
766	struct xfs_da_args	*args,
767	const unsigned char	*name,
768	int			len)
769{
770	if (unlikely(xfs_has_asciici(args->dp->i_mount)))
771		return xfs_ascii_ci_compname(args, name, len);
772	return xfs_da_compname(args, name, len);
773}
774