xref: /openbmc/linux/fs/xfs/libxfs/xfs_dir2_sf.c (revision a36954f5)
1 /*
2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_mount.h"
24 #include "xfs_da_format.h"
25 #include "xfs_da_btree.h"
26 #include "xfs_inode.h"
27 #include "xfs_trans.h"
28 #include "xfs_inode_item.h"
29 #include "xfs_error.h"
30 #include "xfs_dir2.h"
31 #include "xfs_dir2_priv.h"
32 #include "xfs_trace.h"
33 
34 /*
35  * Prototypes for internal functions.
36  */
37 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
38 				     xfs_dir2_sf_entry_t *sfep,
39 				     xfs_dir2_data_aoff_t offset,
40 				     int new_isize);
41 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
42 				     int new_isize);
43 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
44 				    xfs_dir2_sf_entry_t **sfepp,
45 				    xfs_dir2_data_aoff_t *offsetp);
46 #ifdef DEBUG
47 static void xfs_dir2_sf_check(xfs_da_args_t *args);
48 #else
49 #define	xfs_dir2_sf_check(args)
50 #endif /* DEBUG */
51 
52 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
53 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
54 
55 /*
56  * Given a block directory (dp/block), calculate its size as a shortform (sf)
57  * directory and a header for the sf directory, if it will fit it the
58  * space currently present in the inode.  If it won't fit, the output
59  * size is too big (but not accurate).
60  */
61 int						/* size for sf form */
62 xfs_dir2_block_sfsize(
63 	xfs_inode_t		*dp,		/* incore inode pointer */
64 	xfs_dir2_data_hdr_t	*hdr,		/* block directory data */
65 	xfs_dir2_sf_hdr_t	*sfhp)		/* output: header for sf form */
66 {
67 	xfs_dir2_dataptr_t	addr;		/* data entry address */
68 	xfs_dir2_leaf_entry_t	*blp;		/* leaf area of the block */
69 	xfs_dir2_block_tail_t	*btp;		/* tail area of the block */
70 	int			count;		/* shortform entry count */
71 	xfs_dir2_data_entry_t	*dep;		/* data entry in the block */
72 	int			i;		/* block entry index */
73 	int			i8count;	/* count of big-inode entries */
74 	int			isdot;		/* entry is "." */
75 	int			isdotdot;	/* entry is ".." */
76 	xfs_mount_t		*mp;		/* mount structure pointer */
77 	int			namelen;	/* total name bytes */
78 	xfs_ino_t		parent = 0;	/* parent inode number */
79 	int			size=0;		/* total computed size */
80 	int			has_ftype;
81 	struct xfs_da_geometry	*geo;
82 
83 	mp = dp->i_mount;
84 	geo = mp->m_dir_geo;
85 
86 	/*
87 	 * if there is a filetype field, add the extra byte to the namelen
88 	 * for each entry that we see.
89 	 */
90 	has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;
91 
92 	count = i8count = namelen = 0;
93 	btp = xfs_dir2_block_tail_p(geo, hdr);
94 	blp = xfs_dir2_block_leaf_p(btp);
95 
96 	/*
97 	 * Iterate over the block's data entries by using the leaf pointers.
98 	 */
99 	for (i = 0; i < be32_to_cpu(btp->count); i++) {
100 		if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
101 			continue;
102 		/*
103 		 * Calculate the pointer to the entry at hand.
104 		 */
105 		dep = (xfs_dir2_data_entry_t *)((char *)hdr +
106 				xfs_dir2_dataptr_to_off(geo, addr));
107 		/*
108 		 * Detect . and .., so we can special-case them.
109 		 * . is not included in sf directories.
110 		 * .. is included by just the parent inode number.
111 		 */
112 		isdot = dep->namelen == 1 && dep->name[0] == '.';
113 		isdotdot =
114 			dep->namelen == 2 &&
115 			dep->name[0] == '.' && dep->name[1] == '.';
116 
117 		if (!isdot)
118 			i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
119 
120 		/* take into account the file type field */
121 		if (!isdot && !isdotdot) {
122 			count++;
123 			namelen += dep->namelen + has_ftype;
124 		} else if (isdotdot)
125 			parent = be64_to_cpu(dep->inumber);
126 		/*
127 		 * Calculate the new size, see if we should give up yet.
128 		 */
129 		size = xfs_dir2_sf_hdr_size(i8count) +	/* header */
130 		       count * 3 * sizeof(u8) +		/* namelen + offset */
131 		       namelen +			/* name */
132 		       (i8count ?			/* inumber */
133 				count * XFS_INO64_SIZE :
134 				count * XFS_INO32_SIZE);
135 		if (size > XFS_IFORK_DSIZE(dp))
136 			return size;		/* size value is a failure */
137 	}
138 	/*
139 	 * Create the output header, if it worked.
140 	 */
141 	sfhp->count = count;
142 	sfhp->i8count = i8count;
143 	dp->d_ops->sf_put_parent_ino(sfhp, parent);
144 	return size;
145 }
146 
147 /*
148  * Convert a block format directory to shortform.
149  * Caller has already checked that it will fit, and built us a header.
150  */
151 int						/* error */
152 xfs_dir2_block_to_sf(
153 	xfs_da_args_t		*args,		/* operation arguments */
154 	struct xfs_buf		*bp,
155 	int			size,		/* shortform directory size */
156 	xfs_dir2_sf_hdr_t	*sfhp)		/* shortform directory hdr */
157 {
158 	xfs_dir2_data_hdr_t	*hdr;		/* block header */
159 	xfs_dir2_block_tail_t	*btp;		/* block tail pointer */
160 	xfs_dir2_data_entry_t	*dep;		/* data entry pointer */
161 	xfs_inode_t		*dp;		/* incore directory inode */
162 	xfs_dir2_data_unused_t	*dup;		/* unused data pointer */
163 	char			*endptr;	/* end of data entries */
164 	int			error;		/* error return value */
165 	int			logflags;	/* inode logging flags */
166 	xfs_mount_t		*mp;		/* filesystem mount point */
167 	char			*ptr;		/* current data pointer */
168 	xfs_dir2_sf_entry_t	*sfep;		/* shortform entry */
169 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform directory header */
170 	xfs_dir2_sf_hdr_t	*dst;		/* temporary data buffer */
171 
172 	trace_xfs_dir2_block_to_sf(args);
173 
174 	dp = args->dp;
175 	mp = dp->i_mount;
176 
177 	/*
178 	 * allocate a temporary destination buffer the size of the inode
179 	 * to format the data into. Once we have formatted the data, we
180 	 * can free the block and copy the formatted data into the inode literal
181 	 * area.
182 	 */
183 	dst = kmem_alloc(mp->m_sb.sb_inodesize, KM_SLEEP);
184 	hdr = bp->b_addr;
185 
186 	/*
187 	 * Copy the header into the newly allocate local space.
188 	 */
189 	sfp = (xfs_dir2_sf_hdr_t *)dst;
190 	memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
191 
192 	/*
193 	 * Set up to loop over the block's entries.
194 	 */
195 	btp = xfs_dir2_block_tail_p(args->geo, hdr);
196 	ptr = (char *)dp->d_ops->data_entry_p(hdr);
197 	endptr = (char *)xfs_dir2_block_leaf_p(btp);
198 	sfep = xfs_dir2_sf_firstentry(sfp);
199 	/*
200 	 * Loop over the active and unused entries.
201 	 * Stop when we reach the leaf/tail portion of the block.
202 	 */
203 	while (ptr < endptr) {
204 		/*
205 		 * If it's unused, just skip over it.
206 		 */
207 		dup = (xfs_dir2_data_unused_t *)ptr;
208 		if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
209 			ptr += be16_to_cpu(dup->length);
210 			continue;
211 		}
212 		dep = (xfs_dir2_data_entry_t *)ptr;
213 		/*
214 		 * Skip .
215 		 */
216 		if (dep->namelen == 1 && dep->name[0] == '.')
217 			ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
218 		/*
219 		 * Skip .., but make sure the inode number is right.
220 		 */
221 		else if (dep->namelen == 2 &&
222 			 dep->name[0] == '.' && dep->name[1] == '.')
223 			ASSERT(be64_to_cpu(dep->inumber) ==
224 			       dp->d_ops->sf_get_parent_ino(sfp));
225 		/*
226 		 * Normal entry, copy it into shortform.
227 		 */
228 		else {
229 			sfep->namelen = dep->namelen;
230 			xfs_dir2_sf_put_offset(sfep,
231 				(xfs_dir2_data_aoff_t)
232 				((char *)dep - (char *)hdr));
233 			memcpy(sfep->name, dep->name, dep->namelen);
234 			dp->d_ops->sf_put_ino(sfp, sfep,
235 					      be64_to_cpu(dep->inumber));
236 			dp->d_ops->sf_put_ftype(sfep,
237 					dp->d_ops->data_get_ftype(dep));
238 
239 			sfep = dp->d_ops->sf_nextentry(sfp, sfep);
240 		}
241 		ptr += dp->d_ops->data_entsize(dep->namelen);
242 	}
243 	ASSERT((char *)sfep - (char *)sfp == size);
244 
245 	/* now we are done with the block, we can shrink the inode */
246 	logflags = XFS_ILOG_CORE;
247 	error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
248 	if (error) {
249 		ASSERT(error != -ENOSPC);
250 		goto out;
251 	}
252 
253 	/*
254 	 * The buffer is now unconditionally gone, whether
255 	 * xfs_dir2_shrink_inode worked or not.
256 	 *
257 	 * Convert the inode to local format and copy the data in.
258 	 */
259 	ASSERT(dp->i_df.if_bytes == 0);
260 	xfs_init_local_fork(dp, XFS_DATA_FORK, dst, size);
261 	dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
262 	dp->i_d.di_size = size;
263 
264 	logflags |= XFS_ILOG_DDATA;
265 	xfs_dir2_sf_check(args);
266 out:
267 	xfs_trans_log_inode(args->trans, dp, logflags);
268 	kmem_free(dst);
269 	return error;
270 }
271 
272 /*
273  * Add a name to a shortform directory.
274  * There are two algorithms, "easy" and "hard" which we decide on
275  * before changing anything.
276  * Convert to block form if necessary, if the new entry won't fit.
277  */
278 int						/* error */
279 xfs_dir2_sf_addname(
280 	xfs_da_args_t		*args)		/* operation arguments */
281 {
282 	xfs_inode_t		*dp;		/* incore directory inode */
283 	int			error;		/* error return value */
284 	int			incr_isize;	/* total change in size */
285 	int			new_isize;	/* di_size after adding name */
286 	int			objchange;	/* changing to 8-byte inodes */
287 	xfs_dir2_data_aoff_t	offset = 0;	/* offset for new entry */
288 	int			pick;		/* which algorithm to use */
289 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
290 	xfs_dir2_sf_entry_t	*sfep = NULL;	/* shortform entry */
291 
292 	trace_xfs_dir2_sf_addname(args);
293 
294 	ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
295 	dp = args->dp;
296 	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
297 	/*
298 	 * Make sure the shortform value has some of its header.
299 	 */
300 	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
301 		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
302 		return -EIO;
303 	}
304 	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
305 	ASSERT(dp->i_df.if_u1.if_data != NULL);
306 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
307 	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
308 	/*
309 	 * Compute entry (and change in) size.
310 	 */
311 	incr_isize = dp->d_ops->sf_entsize(sfp, args->namelen);
312 	objchange = 0;
313 
314 	/*
315 	 * Do we have to change to 8 byte inodes?
316 	 */
317 	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
318 		/*
319 		 * Yes, adjust the inode size.  old count + (parent + new)
320 		 */
321 		incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
322 		objchange = 1;
323 	}
324 
325 	new_isize = (int)dp->i_d.di_size + incr_isize;
326 	/*
327 	 * Won't fit as shortform any more (due to size),
328 	 * or the pick routine says it won't (due to offset values).
329 	 */
330 	if (new_isize > XFS_IFORK_DSIZE(dp) ||
331 	    (pick =
332 	     xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
333 		/*
334 		 * Just checking or no space reservation, it doesn't fit.
335 		 */
336 		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
337 			return -ENOSPC;
338 		/*
339 		 * Convert to block form then add the name.
340 		 */
341 		error = xfs_dir2_sf_to_block(args);
342 		if (error)
343 			return error;
344 		return xfs_dir2_block_addname(args);
345 	}
346 	/*
347 	 * Just checking, it fits.
348 	 */
349 	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
350 		return 0;
351 	/*
352 	 * Do it the easy way - just add it at the end.
353 	 */
354 	if (pick == 1)
355 		xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
356 	/*
357 	 * Do it the hard way - look for a place to insert the new entry.
358 	 * Convert to 8 byte inode numbers first if necessary.
359 	 */
360 	else {
361 		ASSERT(pick == 2);
362 		if (objchange)
363 			xfs_dir2_sf_toino8(args);
364 		xfs_dir2_sf_addname_hard(args, objchange, new_isize);
365 	}
366 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
367 	return 0;
368 }
369 
370 /*
371  * Add the new entry the "easy" way.
372  * This is copying the old directory and adding the new entry at the end.
373  * Since it's sorted by "offset" we need room after the last offset
374  * that's already there, and then room to convert to a block directory.
375  * This is already checked by the pick routine.
376  */
377 static void
378 xfs_dir2_sf_addname_easy(
379 	xfs_da_args_t		*args,		/* operation arguments */
380 	xfs_dir2_sf_entry_t	*sfep,		/* pointer to new entry */
381 	xfs_dir2_data_aoff_t	offset,		/* offset to use for new ent */
382 	int			new_isize)	/* new directory size */
383 {
384 	int			byteoff;	/* byte offset in sf dir */
385 	xfs_inode_t		*dp;		/* incore directory inode */
386 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
387 
388 	dp = args->dp;
389 
390 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
391 	byteoff = (int)((char *)sfep - (char *)sfp);
392 	/*
393 	 * Grow the in-inode space.
394 	 */
395 	xfs_idata_realloc(dp, dp->d_ops->sf_entsize(sfp, args->namelen),
396 			  XFS_DATA_FORK);
397 	/*
398 	 * Need to set up again due to realloc of the inode data.
399 	 */
400 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
401 	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
402 	/*
403 	 * Fill in the new entry.
404 	 */
405 	sfep->namelen = args->namelen;
406 	xfs_dir2_sf_put_offset(sfep, offset);
407 	memcpy(sfep->name, args->name, sfep->namelen);
408 	dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
409 	dp->d_ops->sf_put_ftype(sfep, args->filetype);
410 
411 	/*
412 	 * Update the header and inode.
413 	 */
414 	sfp->count++;
415 	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
416 		sfp->i8count++;
417 	dp->i_d.di_size = new_isize;
418 	xfs_dir2_sf_check(args);
419 }
420 
421 /*
422  * Add the new entry the "hard" way.
423  * The caller has already converted to 8 byte inode numbers if necessary,
424  * in which case we need to leave the i8count at 1.
425  * Find a hole that the new entry will fit into, and copy
426  * the first part of the entries, the new entry, and the last part of
427  * the entries.
428  */
429 /* ARGSUSED */
430 static void
431 xfs_dir2_sf_addname_hard(
432 	xfs_da_args_t		*args,		/* operation arguments */
433 	int			objchange,	/* changing inode number size */
434 	int			new_isize)	/* new directory size */
435 {
436 	int			add_datasize;	/* data size need for new ent */
437 	char			*buf;		/* buffer for old */
438 	xfs_inode_t		*dp;		/* incore directory inode */
439 	int			eof;		/* reached end of old dir */
440 	int			nbytes;		/* temp for byte copies */
441 	xfs_dir2_data_aoff_t	new_offset;	/* next offset value */
442 	xfs_dir2_data_aoff_t	offset;		/* current offset value */
443 	int			old_isize;	/* previous di_size */
444 	xfs_dir2_sf_entry_t	*oldsfep;	/* entry in original dir */
445 	xfs_dir2_sf_hdr_t	*oldsfp;	/* original shortform dir */
446 	xfs_dir2_sf_entry_t	*sfep;		/* entry in new dir */
447 	xfs_dir2_sf_hdr_t	*sfp;		/* new shortform dir */
448 
449 	/*
450 	 * Copy the old directory to the stack buffer.
451 	 */
452 	dp = args->dp;
453 
454 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
455 	old_isize = (int)dp->i_d.di_size;
456 	buf = kmem_alloc(old_isize, KM_SLEEP);
457 	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
458 	memcpy(oldsfp, sfp, old_isize);
459 	/*
460 	 * Loop over the old directory finding the place we're going
461 	 * to insert the new entry.
462 	 * If it's going to end up at the end then oldsfep will point there.
463 	 */
464 	for (offset = dp->d_ops->data_first_offset,
465 	      oldsfep = xfs_dir2_sf_firstentry(oldsfp),
466 	      add_datasize = dp->d_ops->data_entsize(args->namelen),
467 	      eof = (char *)oldsfep == &buf[old_isize];
468 	     !eof;
469 	     offset = new_offset + dp->d_ops->data_entsize(oldsfep->namelen),
470 	      oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep),
471 	      eof = (char *)oldsfep == &buf[old_isize]) {
472 		new_offset = xfs_dir2_sf_get_offset(oldsfep);
473 		if (offset + add_datasize <= new_offset)
474 			break;
475 	}
476 	/*
477 	 * Get rid of the old directory, then allocate space for
478 	 * the new one.  We do this so xfs_idata_realloc won't copy
479 	 * the data.
480 	 */
481 	xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
482 	xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
483 	/*
484 	 * Reset the pointer since the buffer was reallocated.
485 	 */
486 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
487 	/*
488 	 * Copy the first part of the directory, including the header.
489 	 */
490 	nbytes = (int)((char *)oldsfep - (char *)oldsfp);
491 	memcpy(sfp, oldsfp, nbytes);
492 	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
493 	/*
494 	 * Fill in the new entry, and update the header counts.
495 	 */
496 	sfep->namelen = args->namelen;
497 	xfs_dir2_sf_put_offset(sfep, offset);
498 	memcpy(sfep->name, args->name, sfep->namelen);
499 	dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
500 	dp->d_ops->sf_put_ftype(sfep, args->filetype);
501 	sfp->count++;
502 	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
503 		sfp->i8count++;
504 	/*
505 	 * If there's more left to copy, do that.
506 	 */
507 	if (!eof) {
508 		sfep = dp->d_ops->sf_nextentry(sfp, sfep);
509 		memcpy(sfep, oldsfep, old_isize - nbytes);
510 	}
511 	kmem_free(buf);
512 	dp->i_d.di_size = new_isize;
513 	xfs_dir2_sf_check(args);
514 }
515 
516 /*
517  * Decide if the new entry will fit at all.
518  * If it will fit, pick between adding the new entry to the end (easy)
519  * or somewhere else (hard).
520  * Return 0 (won't fit), 1 (easy), 2 (hard).
521  */
522 /*ARGSUSED*/
523 static int					/* pick result */
524 xfs_dir2_sf_addname_pick(
525 	xfs_da_args_t		*args,		/* operation arguments */
526 	int			objchange,	/* inode # size changes */
527 	xfs_dir2_sf_entry_t	**sfepp,	/* out(1): new entry ptr */
528 	xfs_dir2_data_aoff_t	*offsetp)	/* out(1): new offset */
529 {
530 	xfs_inode_t		*dp;		/* incore directory inode */
531 	int			holefit;	/* found hole it will fit in */
532 	int			i;		/* entry number */
533 	xfs_dir2_data_aoff_t	offset;		/* data block offset */
534 	xfs_dir2_sf_entry_t	*sfep;		/* shortform entry */
535 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
536 	int			size;		/* entry's data size */
537 	int			used;		/* data bytes used */
538 
539 	dp = args->dp;
540 
541 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
542 	size = dp->d_ops->data_entsize(args->namelen);
543 	offset = dp->d_ops->data_first_offset;
544 	sfep = xfs_dir2_sf_firstentry(sfp);
545 	holefit = 0;
546 	/*
547 	 * Loop over sf entries.
548 	 * Keep track of data offset and whether we've seen a place
549 	 * to insert the new entry.
550 	 */
551 	for (i = 0; i < sfp->count; i++) {
552 		if (!holefit)
553 			holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
554 		offset = xfs_dir2_sf_get_offset(sfep) +
555 			 dp->d_ops->data_entsize(sfep->namelen);
556 		sfep = dp->d_ops->sf_nextentry(sfp, sfep);
557 	}
558 	/*
559 	 * Calculate data bytes used excluding the new entry, if this
560 	 * was a data block (block form directory).
561 	 */
562 	used = offset +
563 	       (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
564 	       (uint)sizeof(xfs_dir2_block_tail_t);
565 	/*
566 	 * If it won't fit in a block form then we can't insert it,
567 	 * we'll go back, convert to block, then try the insert and convert
568 	 * to leaf.
569 	 */
570 	if (used + (holefit ? 0 : size) > args->geo->blksize)
571 		return 0;
572 	/*
573 	 * If changing the inode number size, do it the hard way.
574 	 */
575 	if (objchange)
576 		return 2;
577 	/*
578 	 * If it won't fit at the end then do it the hard way (use the hole).
579 	 */
580 	if (used + size > args->geo->blksize)
581 		return 2;
582 	/*
583 	 * Do it the easy way.
584 	 */
585 	*sfepp = sfep;
586 	*offsetp = offset;
587 	return 1;
588 }
589 
590 #ifdef DEBUG
591 /*
592  * Check consistency of shortform directory, assert if bad.
593  */
594 static void
595 xfs_dir2_sf_check(
596 	xfs_da_args_t		*args)		/* operation arguments */
597 {
598 	xfs_inode_t		*dp;		/* incore directory inode */
599 	int			i;		/* entry number */
600 	int			i8count;	/* number of big inode#s */
601 	xfs_ino_t		ino;		/* entry inode number */
602 	int			offset;		/* data offset */
603 	xfs_dir2_sf_entry_t	*sfep;		/* shortform dir entry */
604 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
605 
606 	dp = args->dp;
607 
608 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
609 	offset = dp->d_ops->data_first_offset;
610 	ino = dp->d_ops->sf_get_parent_ino(sfp);
611 	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
612 
613 	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
614 	     i < sfp->count;
615 	     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
616 		ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
617 		ino = dp->d_ops->sf_get_ino(sfp, sfep);
618 		i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
619 		offset =
620 			xfs_dir2_sf_get_offset(sfep) +
621 			dp->d_ops->data_entsize(sfep->namelen);
622 		ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);
623 	}
624 	ASSERT(i8count == sfp->i8count);
625 	ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
626 	ASSERT(offset +
627 	       (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
628 	       (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
629 }
630 #endif	/* DEBUG */
631 
632 /* Verify the consistency of an inline directory. */
633 int
634 xfs_dir2_sf_verify(
635 	struct xfs_inode		*ip)
636 {
637 	struct xfs_mount		*mp = ip->i_mount;
638 	struct xfs_dir2_sf_hdr		*sfp;
639 	struct xfs_dir2_sf_entry	*sfep;
640 	struct xfs_dir2_sf_entry	*next_sfep;
641 	char				*endp;
642 	const struct xfs_dir_ops	*dops;
643 	struct xfs_ifork		*ifp;
644 	xfs_ino_t			ino;
645 	int				i;
646 	int				i8count;
647 	int				offset;
648 	int				size;
649 	int				error;
650 	__uint8_t			filetype;
651 
652 	ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_LOCAL);
653 	/*
654 	 * xfs_iread calls us before xfs_setup_inode sets up ip->d_ops,
655 	 * so we can only trust the mountpoint to have the right pointer.
656 	 */
657 	dops = xfs_dir_get_ops(mp, NULL);
658 
659 	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
660 	sfp = (struct xfs_dir2_sf_hdr *)ifp->if_u1.if_data;
661 	size = ifp->if_bytes;
662 
663 	/*
664 	 * Give up if the directory is way too short.
665 	 */
666 	if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
667 	    size < xfs_dir2_sf_hdr_size(sfp->i8count))
668 		return -EFSCORRUPTED;
669 
670 	endp = (char *)sfp + size;
671 
672 	/* Check .. entry */
673 	ino = dops->sf_get_parent_ino(sfp);
674 	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
675 	error = xfs_dir_ino_validate(mp, ino);
676 	if (error)
677 		return error;
678 	offset = dops->data_first_offset;
679 
680 	/* Check all reported entries */
681 	sfep = xfs_dir2_sf_firstentry(sfp);
682 	for (i = 0; i < sfp->count; i++) {
683 		/*
684 		 * struct xfs_dir2_sf_entry has a variable length.
685 		 * Check the fixed-offset parts of the structure are
686 		 * within the data buffer.
687 		 */
688 		if (((char *)sfep + sizeof(*sfep)) >= endp)
689 			return -EFSCORRUPTED;
690 
691 		/* Don't allow names with known bad length. */
692 		if (sfep->namelen == 0)
693 			return -EFSCORRUPTED;
694 
695 		/*
696 		 * Check that the variable-length part of the structure is
697 		 * within the data buffer.  The next entry starts after the
698 		 * name component, so nextentry is an acceptable test.
699 		 */
700 		next_sfep = dops->sf_nextentry(sfp, sfep);
701 		if (endp < (char *)next_sfep)
702 			return -EFSCORRUPTED;
703 
704 		/* Check that the offsets always increase. */
705 		if (xfs_dir2_sf_get_offset(sfep) < offset)
706 			return -EFSCORRUPTED;
707 
708 		/* Check the inode number. */
709 		ino = dops->sf_get_ino(sfp, sfep);
710 		i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
711 		error = xfs_dir_ino_validate(mp, ino);
712 		if (error)
713 			return error;
714 
715 		/* Check the file type. */
716 		filetype = dops->sf_get_ftype(sfep);
717 		if (filetype >= XFS_DIR3_FT_MAX)
718 			return -EFSCORRUPTED;
719 
720 		offset = xfs_dir2_sf_get_offset(sfep) +
721 				dops->data_entsize(sfep->namelen);
722 
723 		sfep = next_sfep;
724 	}
725 	if (i8count != sfp->i8count)
726 		return -EFSCORRUPTED;
727 	if ((void *)sfep != (void *)endp)
728 		return -EFSCORRUPTED;
729 
730 	/* Make sure this whole thing ought to be in local format. */
731 	if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
732 	    (uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)
733 		return -EFSCORRUPTED;
734 
735 	return 0;
736 }
737 
738 /*
739  * Create a new (shortform) directory.
740  */
741 int					/* error, always 0 */
742 xfs_dir2_sf_create(
743 	xfs_da_args_t	*args,		/* operation arguments */
744 	xfs_ino_t	pino)		/* parent inode number */
745 {
746 	xfs_inode_t	*dp;		/* incore directory inode */
747 	int		i8count;	/* parent inode is an 8-byte number */
748 	xfs_dir2_sf_hdr_t *sfp;		/* shortform structure */
749 	int		size;		/* directory size */
750 
751 	trace_xfs_dir2_sf_create(args);
752 
753 	dp = args->dp;
754 
755 	ASSERT(dp != NULL);
756 	ASSERT(dp->i_d.di_size == 0);
757 	/*
758 	 * If it's currently a zero-length extent file,
759 	 * convert it to local format.
760 	 */
761 	if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
762 		dp->i_df.if_flags &= ~XFS_IFEXTENTS;	/* just in case */
763 		dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
764 		xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
765 		dp->i_df.if_flags |= XFS_IFINLINE;
766 	}
767 	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
768 	ASSERT(dp->i_df.if_bytes == 0);
769 	i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
770 	size = xfs_dir2_sf_hdr_size(i8count);
771 	/*
772 	 * Make a buffer for the data.
773 	 */
774 	xfs_idata_realloc(dp, size, XFS_DATA_FORK);
775 	/*
776 	 * Fill in the header,
777 	 */
778 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
779 	sfp->i8count = i8count;
780 	/*
781 	 * Now can put in the inode number, since i8count is set.
782 	 */
783 	dp->d_ops->sf_put_parent_ino(sfp, pino);
784 	sfp->count = 0;
785 	dp->i_d.di_size = size;
786 	xfs_dir2_sf_check(args);
787 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
788 	return 0;
789 }
790 
791 /*
792  * Lookup an entry in a shortform directory.
793  * Returns EEXIST if found, ENOENT if not found.
794  */
795 int						/* error */
796 xfs_dir2_sf_lookup(
797 	xfs_da_args_t		*args)		/* operation arguments */
798 {
799 	xfs_inode_t		*dp;		/* incore directory inode */
800 	int			i;		/* entry index */
801 	int			error;
802 	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
803 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
804 	enum xfs_dacmp		cmp;		/* comparison result */
805 	xfs_dir2_sf_entry_t	*ci_sfep;	/* case-insens. entry */
806 
807 	trace_xfs_dir2_sf_lookup(args);
808 
809 	xfs_dir2_sf_check(args);
810 	dp = args->dp;
811 
812 	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
813 	/*
814 	 * Bail out if the directory is way too short.
815 	 */
816 	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
817 		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
818 		return -EIO;
819 	}
820 	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
821 	ASSERT(dp->i_df.if_u1.if_data != NULL);
822 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
823 	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
824 	/*
825 	 * Special case for .
826 	 */
827 	if (args->namelen == 1 && args->name[0] == '.') {
828 		args->inumber = dp->i_ino;
829 		args->cmpresult = XFS_CMP_EXACT;
830 		args->filetype = XFS_DIR3_FT_DIR;
831 		return -EEXIST;
832 	}
833 	/*
834 	 * Special case for ..
835 	 */
836 	if (args->namelen == 2 &&
837 	    args->name[0] == '.' && args->name[1] == '.') {
838 		args->inumber = dp->d_ops->sf_get_parent_ino(sfp);
839 		args->cmpresult = XFS_CMP_EXACT;
840 		args->filetype = XFS_DIR3_FT_DIR;
841 		return -EEXIST;
842 	}
843 	/*
844 	 * Loop over all the entries trying to match ours.
845 	 */
846 	ci_sfep = NULL;
847 	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
848 	     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
849 		/*
850 		 * Compare name and if it's an exact match, return the inode
851 		 * number. If it's the first case-insensitive match, store the
852 		 * inode number and continue looking for an exact match.
853 		 */
854 		cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
855 								sfep->namelen);
856 		if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
857 			args->cmpresult = cmp;
858 			args->inumber = dp->d_ops->sf_get_ino(sfp, sfep);
859 			args->filetype = dp->d_ops->sf_get_ftype(sfep);
860 			if (cmp == XFS_CMP_EXACT)
861 				return -EEXIST;
862 			ci_sfep = sfep;
863 		}
864 	}
865 	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
866 	/*
867 	 * Here, we can only be doing a lookup (not a rename or replace).
868 	 * If a case-insensitive match was not found, return -ENOENT.
869 	 */
870 	if (!ci_sfep)
871 		return -ENOENT;
872 	/* otherwise process the CI match as required by the caller */
873 	error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
874 	return error;
875 }
876 
877 /*
878  * Remove an entry from a shortform directory.
879  */
880 int						/* error */
881 xfs_dir2_sf_removename(
882 	xfs_da_args_t		*args)
883 {
884 	int			byteoff;	/* offset of removed entry */
885 	xfs_inode_t		*dp;		/* incore directory inode */
886 	int			entsize;	/* this entry's size */
887 	int			i;		/* shortform entry index */
888 	int			newsize;	/* new inode size */
889 	int			oldsize;	/* old inode size */
890 	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
891 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
892 
893 	trace_xfs_dir2_sf_removename(args);
894 
895 	dp = args->dp;
896 
897 	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
898 	oldsize = (int)dp->i_d.di_size;
899 	/*
900 	 * Bail out if the directory is way too short.
901 	 */
902 	if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
903 		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
904 		return -EIO;
905 	}
906 	ASSERT(dp->i_df.if_bytes == oldsize);
907 	ASSERT(dp->i_df.if_u1.if_data != NULL);
908 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
909 	ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
910 	/*
911 	 * Loop over the old directory entries.
912 	 * Find the one we're deleting.
913 	 */
914 	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
915 	     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
916 		if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
917 								XFS_CMP_EXACT) {
918 			ASSERT(dp->d_ops->sf_get_ino(sfp, sfep) ==
919 			       args->inumber);
920 			break;
921 		}
922 	}
923 	/*
924 	 * Didn't find it.
925 	 */
926 	if (i == sfp->count)
927 		return -ENOENT;
928 	/*
929 	 * Calculate sizes.
930 	 */
931 	byteoff = (int)((char *)sfep - (char *)sfp);
932 	entsize = dp->d_ops->sf_entsize(sfp, args->namelen);
933 	newsize = oldsize - entsize;
934 	/*
935 	 * Copy the part if any after the removed entry, sliding it down.
936 	 */
937 	if (byteoff + entsize < oldsize)
938 		memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
939 			oldsize - (byteoff + entsize));
940 	/*
941 	 * Fix up the header and file size.
942 	 */
943 	sfp->count--;
944 	dp->i_d.di_size = newsize;
945 	/*
946 	 * Reallocate, making it smaller.
947 	 */
948 	xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
949 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
950 	/*
951 	 * Are we changing inode number size?
952 	 */
953 	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
954 		if (sfp->i8count == 1)
955 			xfs_dir2_sf_toino4(args);
956 		else
957 			sfp->i8count--;
958 	}
959 	xfs_dir2_sf_check(args);
960 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
961 	return 0;
962 }
963 
964 /*
965  * Replace the inode number of an entry in a shortform directory.
966  */
967 int						/* error */
968 xfs_dir2_sf_replace(
969 	xfs_da_args_t		*args)		/* operation arguments */
970 {
971 	xfs_inode_t		*dp;		/* incore directory inode */
972 	int			i;		/* entry index */
973 	xfs_ino_t		ino=0;		/* entry old inode number */
974 	int			i8elevated;	/* sf_toino8 set i8count=1 */
975 	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
976 	xfs_dir2_sf_hdr_t	*sfp;		/* shortform structure */
977 
978 	trace_xfs_dir2_sf_replace(args);
979 
980 	dp = args->dp;
981 
982 	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
983 	/*
984 	 * Bail out if the shortform directory is way too small.
985 	 */
986 	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
987 		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
988 		return -EIO;
989 	}
990 	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
991 	ASSERT(dp->i_df.if_u1.if_data != NULL);
992 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
993 	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
994 
995 	/*
996 	 * New inode number is large, and need to convert to 8-byte inodes.
997 	 */
998 	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
999 		int	error;			/* error return value */
1000 		int	newsize;		/* new inode size */
1001 
1002 		newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
1003 		/*
1004 		 * Won't fit as shortform, convert to block then do replace.
1005 		 */
1006 		if (newsize > XFS_IFORK_DSIZE(dp)) {
1007 			error = xfs_dir2_sf_to_block(args);
1008 			if (error) {
1009 				return error;
1010 			}
1011 			return xfs_dir2_block_replace(args);
1012 		}
1013 		/*
1014 		 * Still fits, convert to 8-byte now.
1015 		 */
1016 		xfs_dir2_sf_toino8(args);
1017 		i8elevated = 1;
1018 		sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1019 	} else
1020 		i8elevated = 0;
1021 
1022 	ASSERT(args->namelen != 1 || args->name[0] != '.');
1023 	/*
1024 	 * Replace ..'s entry.
1025 	 */
1026 	if (args->namelen == 2 &&
1027 	    args->name[0] == '.' && args->name[1] == '.') {
1028 		ino = dp->d_ops->sf_get_parent_ino(sfp);
1029 		ASSERT(args->inumber != ino);
1030 		dp->d_ops->sf_put_parent_ino(sfp, args->inumber);
1031 	}
1032 	/*
1033 	 * Normal entry, look for the name.
1034 	 */
1035 	else {
1036 		for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
1037 		     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
1038 			if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1039 								XFS_CMP_EXACT) {
1040 				ino = dp->d_ops->sf_get_ino(sfp, sfep);
1041 				ASSERT(args->inumber != ino);
1042 				dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
1043 				dp->d_ops->sf_put_ftype(sfep, args->filetype);
1044 				break;
1045 			}
1046 		}
1047 		/*
1048 		 * Didn't find it.
1049 		 */
1050 		if (i == sfp->count) {
1051 			ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1052 			if (i8elevated)
1053 				xfs_dir2_sf_toino4(args);
1054 			return -ENOENT;
1055 		}
1056 	}
1057 	/*
1058 	 * See if the old number was large, the new number is small.
1059 	 */
1060 	if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1061 	    args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1062 		/*
1063 		 * And the old count was one, so need to convert to small.
1064 		 */
1065 		if (sfp->i8count == 1)
1066 			xfs_dir2_sf_toino4(args);
1067 		else
1068 			sfp->i8count--;
1069 	}
1070 	/*
1071 	 * See if the old number was small, the new number is large.
1072 	 */
1073 	if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1074 	    args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1075 		/*
1076 		 * add to the i8count unless we just converted to 8-byte
1077 		 * inodes (which does an implied i8count = 1)
1078 		 */
1079 		ASSERT(sfp->i8count != 0);
1080 		if (!i8elevated)
1081 			sfp->i8count++;
1082 	}
1083 	xfs_dir2_sf_check(args);
1084 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1085 	return 0;
1086 }
1087 
1088 /*
1089  * Convert from 8-byte inode numbers to 4-byte inode numbers.
1090  * The last 8-byte inode number is gone, but the count is still 1.
1091  */
1092 static void
1093 xfs_dir2_sf_toino4(
1094 	xfs_da_args_t		*args)		/* operation arguments */
1095 {
1096 	char			*buf;		/* old dir's buffer */
1097 	xfs_inode_t		*dp;		/* incore directory inode */
1098 	int			i;		/* entry index */
1099 	int			newsize;	/* new inode size */
1100 	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
1101 	xfs_dir2_sf_hdr_t	*oldsfp;	/* old sf directory */
1102 	int			oldsize;	/* old inode size */
1103 	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
1104 	xfs_dir2_sf_hdr_t	*sfp;		/* new sf directory */
1105 
1106 	trace_xfs_dir2_sf_toino4(args);
1107 
1108 	dp = args->dp;
1109 
1110 	/*
1111 	 * Copy the old directory to the buffer.
1112 	 * Then nuke it from the inode, and add the new buffer to the inode.
1113 	 * Don't want xfs_idata_realloc copying the data here.
1114 	 */
1115 	oldsize = dp->i_df.if_bytes;
1116 	buf = kmem_alloc(oldsize, KM_SLEEP);
1117 	oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1118 	ASSERT(oldsfp->i8count == 1);
1119 	memcpy(buf, oldsfp, oldsize);
1120 	/*
1121 	 * Compute the new inode size.
1122 	 */
1123 	newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
1124 	xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1125 	xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1126 	/*
1127 	 * Reset our pointers, the data has moved.
1128 	 */
1129 	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1130 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1131 	/*
1132 	 * Fill in the new header.
1133 	 */
1134 	sfp->count = oldsfp->count;
1135 	sfp->i8count = 0;
1136 	dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1137 	/*
1138 	 * Copy the entries field by field.
1139 	 */
1140 	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1141 		    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1142 	     i < sfp->count;
1143 	     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1144 		  oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1145 		sfep->namelen = oldsfep->namelen;
1146 		memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1147 		memcpy(sfep->name, oldsfep->name, sfep->namelen);
1148 		dp->d_ops->sf_put_ino(sfp, sfep,
1149 				      dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1150 		dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1151 	}
1152 	/*
1153 	 * Clean up the inode.
1154 	 */
1155 	kmem_free(buf);
1156 	dp->i_d.di_size = newsize;
1157 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1158 }
1159 
1160 /*
1161  * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
1162  * The new entry w/ an 8-byte inode number is not there yet; we leave with
1163  * i8count set to 1, but no corresponding 8-byte entry.
1164  */
1165 static void
1166 xfs_dir2_sf_toino8(
1167 	xfs_da_args_t		*args)		/* operation arguments */
1168 {
1169 	char			*buf;		/* old dir's buffer */
1170 	xfs_inode_t		*dp;		/* incore directory inode */
1171 	int			i;		/* entry index */
1172 	int			newsize;	/* new inode size */
1173 	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
1174 	xfs_dir2_sf_hdr_t	*oldsfp;	/* old sf directory */
1175 	int			oldsize;	/* old inode size */
1176 	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
1177 	xfs_dir2_sf_hdr_t	*sfp;		/* new sf directory */
1178 
1179 	trace_xfs_dir2_sf_toino8(args);
1180 
1181 	dp = args->dp;
1182 
1183 	/*
1184 	 * Copy the old directory to the buffer.
1185 	 * Then nuke it from the inode, and add the new buffer to the inode.
1186 	 * Don't want xfs_idata_realloc copying the data here.
1187 	 */
1188 	oldsize = dp->i_df.if_bytes;
1189 	buf = kmem_alloc(oldsize, KM_SLEEP);
1190 	oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1191 	ASSERT(oldsfp->i8count == 0);
1192 	memcpy(buf, oldsfp, oldsize);
1193 	/*
1194 	 * Compute the new inode size (nb: entry count + 1 for parent)
1195 	 */
1196 	newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
1197 	xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1198 	xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1199 	/*
1200 	 * Reset our pointers, the data has moved.
1201 	 */
1202 	oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1203 	sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1204 	/*
1205 	 * Fill in the new header.
1206 	 */
1207 	sfp->count = oldsfp->count;
1208 	sfp->i8count = 1;
1209 	dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1210 	/*
1211 	 * Copy the entries field by field.
1212 	 */
1213 	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1214 		    oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1215 	     i < sfp->count;
1216 	     i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1217 		  oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1218 		sfep->namelen = oldsfep->namelen;
1219 		memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1220 		memcpy(sfep->name, oldsfep->name, sfep->namelen);
1221 		dp->d_ops->sf_put_ino(sfp, sfep,
1222 				      dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1223 		dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1224 	}
1225 	/*
1226 	 * Clean up the inode.
1227 	 */
1228 	kmem_free(buf);
1229 	dp->i_d.di_size = newsize;
1230 	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1231 }
1232