xref: /openbmc/linux/fs/xfs/xfs_fsops.c (revision f35e839a)
1 /*
2  * Copyright (c) 2000-2005 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_types.h"
21 #include "xfs_log.h"
22 #include "xfs_trans.h"
23 #include "xfs_sb.h"
24 #include "xfs_ag.h"
25 #include "xfs_mount.h"
26 #include "xfs_bmap_btree.h"
27 #include "xfs_alloc_btree.h"
28 #include "xfs_ialloc_btree.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_inode_item.h"
32 #include "xfs_btree.h"
33 #include "xfs_error.h"
34 #include "xfs_alloc.h"
35 #include "xfs_ialloc.h"
36 #include "xfs_fsops.h"
37 #include "xfs_itable.h"
38 #include "xfs_trans_space.h"
39 #include "xfs_rtalloc.h"
40 #include "xfs_filestream.h"
41 #include "xfs_trace.h"
42 
43 /*
44  * File system operations
45  */
46 
47 int
48 xfs_fs_geometry(
49 	xfs_mount_t		*mp,
50 	xfs_fsop_geom_t		*geo,
51 	int			new_version)
52 {
53 
54 	memset(geo, 0, sizeof(*geo));
55 
56 	geo->blocksize = mp->m_sb.sb_blocksize;
57 	geo->rtextsize = mp->m_sb.sb_rextsize;
58 	geo->agblocks = mp->m_sb.sb_agblocks;
59 	geo->agcount = mp->m_sb.sb_agcount;
60 	geo->logblocks = mp->m_sb.sb_logblocks;
61 	geo->sectsize = mp->m_sb.sb_sectsize;
62 	geo->inodesize = mp->m_sb.sb_inodesize;
63 	geo->imaxpct = mp->m_sb.sb_imax_pct;
64 	geo->datablocks = mp->m_sb.sb_dblocks;
65 	geo->rtblocks = mp->m_sb.sb_rblocks;
66 	geo->rtextents = mp->m_sb.sb_rextents;
67 	geo->logstart = mp->m_sb.sb_logstart;
68 	ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
69 	memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
70 	if (new_version >= 2) {
71 		geo->sunit = mp->m_sb.sb_unit;
72 		geo->swidth = mp->m_sb.sb_width;
73 	}
74 	if (new_version >= 3) {
75 		geo->version = XFS_FSOP_GEOM_VERSION;
76 		geo->flags =
77 			(xfs_sb_version_hasattr(&mp->m_sb) ?
78 				XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
79 			(xfs_sb_version_hasnlink(&mp->m_sb) ?
80 				XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
81 			(xfs_sb_version_hasquota(&mp->m_sb) ?
82 				XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
83 			(xfs_sb_version_hasalign(&mp->m_sb) ?
84 				XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
85 			(xfs_sb_version_hasdalign(&mp->m_sb) ?
86 				XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
87 			(xfs_sb_version_hasshared(&mp->m_sb) ?
88 				XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
89 			(xfs_sb_version_hasextflgbit(&mp->m_sb) ?
90 				XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
91 			(xfs_sb_version_hasdirv2(&mp->m_sb) ?
92 				XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
93 			(xfs_sb_version_hassector(&mp->m_sb) ?
94 				XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
95 			(xfs_sb_version_hasasciici(&mp->m_sb) ?
96 				XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
97 			(xfs_sb_version_haslazysbcount(&mp->m_sb) ?
98 				XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
99 			(xfs_sb_version_hasattr2(&mp->m_sb) ?
100 				XFS_FSOP_GEOM_FLAGS_ATTR2 : 0) |
101 			(xfs_sb_version_hasprojid32bit(&mp->m_sb) ?
102 				XFS_FSOP_GEOM_FLAGS_PROJID32 : 0);
103 		geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
104 				mp->m_sb.sb_logsectsize : BBSIZE;
105 		geo->rtsectsize = mp->m_sb.sb_blocksize;
106 		geo->dirblocksize = mp->m_dirblksize;
107 	}
108 	if (new_version >= 4) {
109 		geo->flags |=
110 			(xfs_sb_version_haslogv2(&mp->m_sb) ?
111 				XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
112 		geo->logsunit = mp->m_sb.sb_logsunit;
113 	}
114 	return 0;
115 }
116 
117 static struct xfs_buf *
118 xfs_growfs_get_hdr_buf(
119 	struct xfs_mount	*mp,
120 	xfs_daddr_t		blkno,
121 	size_t			numblks,
122 	int			flags,
123 	const struct xfs_buf_ops *ops)
124 {
125 	struct xfs_buf		*bp;
126 
127 	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
128 	if (!bp)
129 		return NULL;
130 
131 	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
132 	bp->b_bn = blkno;
133 	bp->b_maps[0].bm_bn = blkno;
134 	bp->b_ops = ops;
135 
136 	return bp;
137 }
138 
139 static int
140 xfs_growfs_data_private(
141 	xfs_mount_t		*mp,		/* mount point for filesystem */
142 	xfs_growfs_data_t	*in)		/* growfs data input struct */
143 {
144 	xfs_agf_t		*agf;
145 	struct xfs_agfl		*agfl;
146 	xfs_agi_t		*agi;
147 	xfs_agnumber_t		agno;
148 	xfs_extlen_t		agsize;
149 	xfs_extlen_t		tmpsize;
150 	xfs_alloc_rec_t		*arec;
151 	xfs_buf_t		*bp;
152 	int			bucket;
153 	int			dpct;
154 	int			error;
155 	xfs_agnumber_t		nagcount;
156 	xfs_agnumber_t		nagimax = 0;
157 	xfs_rfsblock_t		nb, nb_mod;
158 	xfs_rfsblock_t		new;
159 	xfs_rfsblock_t		nfree;
160 	xfs_agnumber_t		oagcount;
161 	int			pct;
162 	xfs_trans_t		*tp;
163 
164 	nb = in->newblocks;
165 	pct = in->imaxpct;
166 	if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
167 		return XFS_ERROR(EINVAL);
168 	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
169 		return error;
170 	dpct = pct - mp->m_sb.sb_imax_pct;
171 	bp = xfs_buf_read_uncached(mp->m_ddev_targp,
172 				XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
173 				XFS_FSS_TO_BB(mp, 1), 0, NULL);
174 	if (!bp)
175 		return EIO;
176 	if (bp->b_error) {
177 		int	error = bp->b_error;
178 		xfs_buf_relse(bp);
179 		return error;
180 	}
181 	xfs_buf_relse(bp);
182 
183 	new = nb;	/* use new as a temporary here */
184 	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
185 	nagcount = new + (nb_mod != 0);
186 	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
187 		nagcount--;
188 		nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
189 		if (nb < mp->m_sb.sb_dblocks)
190 			return XFS_ERROR(EINVAL);
191 	}
192 	new = nb - mp->m_sb.sb_dblocks;
193 	oagcount = mp->m_sb.sb_agcount;
194 
195 	/* allocate the new per-ag structures */
196 	if (nagcount > oagcount) {
197 		error = xfs_initialize_perag(mp, nagcount, &nagimax);
198 		if (error)
199 			return error;
200 	}
201 
202 	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
203 	tp->t_flags |= XFS_TRANS_RESERVE;
204 	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
205 			XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
206 		xfs_trans_cancel(tp, 0);
207 		return error;
208 	}
209 
210 	/*
211 	 * Write new AG headers to disk. Non-transactional, but written
212 	 * synchronously so they are completed prior to the growfs transaction
213 	 * being logged.
214 	 */
215 	nfree = 0;
216 	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
217 		/*
218 		 * AG freespace header block
219 		 */
220 		bp = xfs_growfs_get_hdr_buf(mp,
221 				XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
222 				XFS_FSS_TO_BB(mp, 1), 0,
223 				&xfs_agf_buf_ops);
224 		if (!bp) {
225 			error = ENOMEM;
226 			goto error0;
227 		}
228 
229 		agf = XFS_BUF_TO_AGF(bp);
230 		agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
231 		agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
232 		agf->agf_seqno = cpu_to_be32(agno);
233 		if (agno == nagcount - 1)
234 			agsize =
235 				nb -
236 				(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
237 		else
238 			agsize = mp->m_sb.sb_agblocks;
239 		agf->agf_length = cpu_to_be32(agsize);
240 		agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
241 		agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
242 		agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
243 		agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
244 		agf->agf_flfirst = 0;
245 		agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
246 		agf->agf_flcount = 0;
247 		tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
248 		agf->agf_freeblks = cpu_to_be32(tmpsize);
249 		agf->agf_longest = cpu_to_be32(tmpsize);
250 		if (xfs_sb_version_hascrc(&mp->m_sb))
251 			uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_uuid);
252 
253 		error = xfs_bwrite(bp);
254 		xfs_buf_relse(bp);
255 		if (error)
256 			goto error0;
257 
258 		/*
259 		 * AG freelist header block
260 		 */
261 		bp = xfs_growfs_get_hdr_buf(mp,
262 				XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)),
263 				XFS_FSS_TO_BB(mp, 1), 0,
264 				&xfs_agfl_buf_ops);
265 		if (!bp) {
266 			error = ENOMEM;
267 			goto error0;
268 		}
269 
270 		agfl = XFS_BUF_TO_AGFL(bp);
271 		if (xfs_sb_version_hascrc(&mp->m_sb)) {
272 			agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
273 			agfl->agfl_seqno = cpu_to_be32(agno);
274 			uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_uuid);
275 		}
276 		for (bucket = 0; bucket < XFS_AGFL_SIZE(mp); bucket++)
277 			agfl->agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
278 
279 		error = xfs_bwrite(bp);
280 		xfs_buf_relse(bp);
281 		if (error)
282 			goto error0;
283 
284 		/*
285 		 * AG inode header block
286 		 */
287 		bp = xfs_growfs_get_hdr_buf(mp,
288 				XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
289 				XFS_FSS_TO_BB(mp, 1), 0,
290 				&xfs_agi_buf_ops);
291 		if (!bp) {
292 			error = ENOMEM;
293 			goto error0;
294 		}
295 
296 		agi = XFS_BUF_TO_AGI(bp);
297 		agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
298 		agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
299 		agi->agi_seqno = cpu_to_be32(agno);
300 		agi->agi_length = cpu_to_be32(agsize);
301 		agi->agi_count = 0;
302 		agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
303 		agi->agi_level = cpu_to_be32(1);
304 		agi->agi_freecount = 0;
305 		agi->agi_newino = cpu_to_be32(NULLAGINO);
306 		agi->agi_dirino = cpu_to_be32(NULLAGINO);
307 		if (xfs_sb_version_hascrc(&mp->m_sb))
308 			uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_uuid);
309 		for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
310 			agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
311 
312 		error = xfs_bwrite(bp);
313 		xfs_buf_relse(bp);
314 		if (error)
315 			goto error0;
316 
317 		/*
318 		 * BNO btree root block
319 		 */
320 		bp = xfs_growfs_get_hdr_buf(mp,
321 				XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
322 				BTOBB(mp->m_sb.sb_blocksize), 0,
323 				&xfs_allocbt_buf_ops);
324 
325 		if (!bp) {
326 			error = ENOMEM;
327 			goto error0;
328 		}
329 
330 		if (xfs_sb_version_hascrc(&mp->m_sb))
331 			xfs_btree_init_block(mp, bp, XFS_ABTB_CRC_MAGIC, 0, 1,
332 						agno, XFS_BTREE_CRC_BLOCKS);
333 		else
334 			xfs_btree_init_block(mp, bp, XFS_ABTB_MAGIC, 0, 1,
335 						agno, 0);
336 
337 		arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
338 		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
339 		arec->ar_blockcount = cpu_to_be32(
340 			agsize - be32_to_cpu(arec->ar_startblock));
341 
342 		error = xfs_bwrite(bp);
343 		xfs_buf_relse(bp);
344 		if (error)
345 			goto error0;
346 
347 		/*
348 		 * CNT btree root block
349 		 */
350 		bp = xfs_growfs_get_hdr_buf(mp,
351 				XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
352 				BTOBB(mp->m_sb.sb_blocksize), 0,
353 				&xfs_allocbt_buf_ops);
354 		if (!bp) {
355 			error = ENOMEM;
356 			goto error0;
357 		}
358 
359 		if (xfs_sb_version_hascrc(&mp->m_sb))
360 			xfs_btree_init_block(mp, bp, XFS_ABTC_CRC_MAGIC, 0, 1,
361 						agno, XFS_BTREE_CRC_BLOCKS);
362 		else
363 			xfs_btree_init_block(mp, bp, XFS_ABTC_MAGIC, 0, 1,
364 						agno, 0);
365 
366 		arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
367 		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
368 		arec->ar_blockcount = cpu_to_be32(
369 			agsize - be32_to_cpu(arec->ar_startblock));
370 		nfree += be32_to_cpu(arec->ar_blockcount);
371 
372 		error = xfs_bwrite(bp);
373 		xfs_buf_relse(bp);
374 		if (error)
375 			goto error0;
376 
377 		/*
378 		 * INO btree root block
379 		 */
380 		bp = xfs_growfs_get_hdr_buf(mp,
381 				XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
382 				BTOBB(mp->m_sb.sb_blocksize), 0,
383 				&xfs_inobt_buf_ops);
384 		if (!bp) {
385 			error = ENOMEM;
386 			goto error0;
387 		}
388 
389 		if (xfs_sb_version_hascrc(&mp->m_sb))
390 			xfs_btree_init_block(mp, bp, XFS_IBT_CRC_MAGIC, 0, 0,
391 						agno, XFS_BTREE_CRC_BLOCKS);
392 		else
393 			xfs_btree_init_block(mp, bp, XFS_IBT_MAGIC, 0, 0,
394 						agno, 0);
395 
396 		error = xfs_bwrite(bp);
397 		xfs_buf_relse(bp);
398 		if (error)
399 			goto error0;
400 	}
401 	xfs_trans_agblocks_delta(tp, nfree);
402 	/*
403 	 * There are new blocks in the old last a.g.
404 	 */
405 	if (new) {
406 		/*
407 		 * Change the agi length.
408 		 */
409 		error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
410 		if (error) {
411 			goto error0;
412 		}
413 		ASSERT(bp);
414 		agi = XFS_BUF_TO_AGI(bp);
415 		be32_add_cpu(&agi->agi_length, new);
416 		ASSERT(nagcount == oagcount ||
417 		       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
418 		xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
419 		/*
420 		 * Change agf length.
421 		 */
422 		error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
423 		if (error) {
424 			goto error0;
425 		}
426 		ASSERT(bp);
427 		agf = XFS_BUF_TO_AGF(bp);
428 		be32_add_cpu(&agf->agf_length, new);
429 		ASSERT(be32_to_cpu(agf->agf_length) ==
430 		       be32_to_cpu(agi->agi_length));
431 
432 		xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
433 		/*
434 		 * Free the new space.
435 		 */
436 		error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
437 			be32_to_cpu(agf->agf_length) - new), new);
438 		if (error) {
439 			goto error0;
440 		}
441 	}
442 
443 	/*
444 	 * Update changed superblock fields transactionally. These are not
445 	 * seen by the rest of the world until the transaction commit applies
446 	 * them atomically to the superblock.
447 	 */
448 	if (nagcount > oagcount)
449 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
450 	if (nb > mp->m_sb.sb_dblocks)
451 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
452 				 nb - mp->m_sb.sb_dblocks);
453 	if (nfree)
454 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
455 	if (dpct)
456 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
457 	error = xfs_trans_commit(tp, 0);
458 	if (error)
459 		return error;
460 
461 	/* New allocation groups fully initialized, so update mount struct */
462 	if (nagimax)
463 		mp->m_maxagi = nagimax;
464 	if (mp->m_sb.sb_imax_pct) {
465 		__uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
466 		do_div(icount, 100);
467 		mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
468 	} else
469 		mp->m_maxicount = 0;
470 	xfs_set_low_space_thresholds(mp);
471 
472 	/* update secondary superblocks. */
473 	for (agno = 1; agno < nagcount; agno++) {
474 		error = 0;
475 		/*
476 		 * new secondary superblocks need to be zeroed, not read from
477 		 * disk as the contents of the new area we are growing into is
478 		 * completely unknown.
479 		 */
480 		if (agno < oagcount) {
481 			error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
482 				  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
483 				  XFS_FSS_TO_BB(mp, 1), 0, &bp,
484 				  &xfs_sb_buf_ops);
485 		} else {
486 			bp = xfs_trans_get_buf(NULL, mp->m_ddev_targp,
487 				  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
488 				  XFS_FSS_TO_BB(mp, 1), 0);
489 			if (bp) {
490 				bp->b_ops = &xfs_sb_buf_ops;
491 				xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
492 			} else
493 				error = ENOMEM;
494 		}
495 
496 		if (error) {
497 			xfs_warn(mp,
498 		"error %d reading secondary superblock for ag %d",
499 				error, agno);
500 			break;
501 		}
502 		xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
503 
504 		/*
505 		 * If we get an error writing out the alternate superblocks,
506 		 * just issue a warning and continue.  The real work is
507 		 * already done and committed.
508 		 */
509 		error = xfs_bwrite(bp);
510 		xfs_buf_relse(bp);
511 		if (error) {
512 			xfs_warn(mp,
513 		"write error %d updating secondary superblock for ag %d",
514 				error, agno);
515 			break; /* no point in continuing */
516 		}
517 	}
518 	return error;
519 
520  error0:
521 	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
522 	return error;
523 }
524 
525 static int
526 xfs_growfs_log_private(
527 	xfs_mount_t		*mp,	/* mount point for filesystem */
528 	xfs_growfs_log_t	*in)	/* growfs log input struct */
529 {
530 	xfs_extlen_t		nb;
531 
532 	nb = in->newblocks;
533 	if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
534 		return XFS_ERROR(EINVAL);
535 	if (nb == mp->m_sb.sb_logblocks &&
536 	    in->isint == (mp->m_sb.sb_logstart != 0))
537 		return XFS_ERROR(EINVAL);
538 	/*
539 	 * Moving the log is hard, need new interfaces to sync
540 	 * the log first, hold off all activity while moving it.
541 	 * Can have shorter or longer log in the same space,
542 	 * or transform internal to external log or vice versa.
543 	 */
544 	return XFS_ERROR(ENOSYS);
545 }
546 
547 /*
548  * protected versions of growfs function acquire and release locks on the mount
549  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
550  * XFS_IOC_FSGROWFSRT
551  */
552 
553 
554 int
555 xfs_growfs_data(
556 	xfs_mount_t		*mp,
557 	xfs_growfs_data_t	*in)
558 {
559 	int error;
560 
561 	if (!capable(CAP_SYS_ADMIN))
562 		return XFS_ERROR(EPERM);
563 	if (!mutex_trylock(&mp->m_growlock))
564 		return XFS_ERROR(EWOULDBLOCK);
565 	error = xfs_growfs_data_private(mp, in);
566 	mutex_unlock(&mp->m_growlock);
567 	return error;
568 }
569 
570 int
571 xfs_growfs_log(
572 	xfs_mount_t		*mp,
573 	xfs_growfs_log_t	*in)
574 {
575 	int error;
576 
577 	if (!capable(CAP_SYS_ADMIN))
578 		return XFS_ERROR(EPERM);
579 	if (!mutex_trylock(&mp->m_growlock))
580 		return XFS_ERROR(EWOULDBLOCK);
581 	error = xfs_growfs_log_private(mp, in);
582 	mutex_unlock(&mp->m_growlock);
583 	return error;
584 }
585 
586 /*
587  * exported through ioctl XFS_IOC_FSCOUNTS
588  */
589 
590 int
591 xfs_fs_counts(
592 	xfs_mount_t		*mp,
593 	xfs_fsop_counts_t	*cnt)
594 {
595 	xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
596 	spin_lock(&mp->m_sb_lock);
597 	cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
598 	cnt->freertx = mp->m_sb.sb_frextents;
599 	cnt->freeino = mp->m_sb.sb_ifree;
600 	cnt->allocino = mp->m_sb.sb_icount;
601 	spin_unlock(&mp->m_sb_lock);
602 	return 0;
603 }
604 
605 /*
606  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
607  *
608  * xfs_reserve_blocks is called to set m_resblks
609  * in the in-core mount table. The number of unused reserved blocks
610  * is kept in m_resblks_avail.
611  *
612  * Reserve the requested number of blocks if available. Otherwise return
613  * as many as possible to satisfy the request. The actual number
614  * reserved are returned in outval
615  *
616  * A null inval pointer indicates that only the current reserved blocks
617  * available  should  be returned no settings are changed.
618  */
619 
620 int
621 xfs_reserve_blocks(
622 	xfs_mount_t             *mp,
623 	__uint64_t              *inval,
624 	xfs_fsop_resblks_t      *outval)
625 {
626 	__int64_t		lcounter, delta, fdblks_delta;
627 	__uint64_t		request;
628 
629 	/* If inval is null, report current values and return */
630 	if (inval == (__uint64_t *)NULL) {
631 		if (!outval)
632 			return EINVAL;
633 		outval->resblks = mp->m_resblks;
634 		outval->resblks_avail = mp->m_resblks_avail;
635 		return 0;
636 	}
637 
638 	request = *inval;
639 
640 	/*
641 	 * With per-cpu counters, this becomes an interesting
642 	 * problem. we needto work out if we are freeing or allocation
643 	 * blocks first, then we can do the modification as necessary.
644 	 *
645 	 * We do this under the m_sb_lock so that if we are near
646 	 * ENOSPC, we will hold out any changes while we work out
647 	 * what to do. This means that the amount of free space can
648 	 * change while we do this, so we need to retry if we end up
649 	 * trying to reserve more space than is available.
650 	 *
651 	 * We also use the xfs_mod_incore_sb() interface so that we
652 	 * don't have to care about whether per cpu counter are
653 	 * enabled, disabled or even compiled in....
654 	 */
655 retry:
656 	spin_lock(&mp->m_sb_lock);
657 	xfs_icsb_sync_counters_locked(mp, 0);
658 
659 	/*
660 	 * If our previous reservation was larger than the current value,
661 	 * then move any unused blocks back to the free pool.
662 	 */
663 	fdblks_delta = 0;
664 	if (mp->m_resblks > request) {
665 		lcounter = mp->m_resblks_avail - request;
666 		if (lcounter  > 0) {		/* release unused blocks */
667 			fdblks_delta = lcounter;
668 			mp->m_resblks_avail -= lcounter;
669 		}
670 		mp->m_resblks = request;
671 	} else {
672 		__int64_t	free;
673 
674 		free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
675 		if (!free)
676 			goto out; /* ENOSPC and fdblks_delta = 0 */
677 
678 		delta = request - mp->m_resblks;
679 		lcounter = free - delta;
680 		if (lcounter < 0) {
681 			/* We can't satisfy the request, just get what we can */
682 			mp->m_resblks += free;
683 			mp->m_resblks_avail += free;
684 			fdblks_delta = -free;
685 		} else {
686 			fdblks_delta = -delta;
687 			mp->m_resblks = request;
688 			mp->m_resblks_avail += delta;
689 		}
690 	}
691 out:
692 	if (outval) {
693 		outval->resblks = mp->m_resblks;
694 		outval->resblks_avail = mp->m_resblks_avail;
695 	}
696 	spin_unlock(&mp->m_sb_lock);
697 
698 	if (fdblks_delta) {
699 		/*
700 		 * If we are putting blocks back here, m_resblks_avail is
701 		 * already at its max so this will put it in the free pool.
702 		 *
703 		 * If we need space, we'll either succeed in getting it
704 		 * from the free block count or we'll get an enospc. If
705 		 * we get a ENOSPC, it means things changed while we were
706 		 * calculating fdblks_delta and so we should try again to
707 		 * see if there is anything left to reserve.
708 		 *
709 		 * Don't set the reserved flag here - we don't want to reserve
710 		 * the extra reserve blocks from the reserve.....
711 		 */
712 		int error;
713 		error = xfs_icsb_modify_counters(mp, XFS_SBS_FDBLOCKS,
714 						 fdblks_delta, 0);
715 		if (error == ENOSPC)
716 			goto retry;
717 	}
718 	return 0;
719 }
720 
721 /*
722  * Dump a transaction into the log that contains no real change. This is needed
723  * to be able to make the log dirty or stamp the current tail LSN into the log
724  * during the covering operation.
725  *
726  * We cannot use an inode here for this - that will push dirty state back up
727  * into the VFS and then periodic inode flushing will prevent log covering from
728  * making progress. Hence we log a field in the superblock instead and use a
729  * synchronous transaction to ensure the superblock is immediately unpinned
730  * and can be written back.
731  */
732 int
733 xfs_fs_log_dummy(
734 	xfs_mount_t	*mp)
735 {
736 	xfs_trans_t	*tp;
737 	int		error;
738 
739 	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
740 	error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
741 				  XFS_DEFAULT_LOG_COUNT);
742 	if (error) {
743 		xfs_trans_cancel(tp, 0);
744 		return error;
745 	}
746 
747 	/* log the UUID because it is an unchanging field */
748 	xfs_mod_sb(tp, XFS_SB_UUID);
749 	xfs_trans_set_sync(tp);
750 	return xfs_trans_commit(tp, 0);
751 }
752 
753 int
754 xfs_fs_goingdown(
755 	xfs_mount_t	*mp,
756 	__uint32_t	inflags)
757 {
758 	switch (inflags) {
759 	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
760 		struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
761 
762 		if (sb && !IS_ERR(sb)) {
763 			xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
764 			thaw_bdev(sb->s_bdev, sb);
765 		}
766 
767 		break;
768 	}
769 	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
770 		xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
771 		break;
772 	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
773 		xfs_force_shutdown(mp,
774 				SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
775 		break;
776 	default:
777 		return XFS_ERROR(EINVAL);
778 	}
779 
780 	return 0;
781 }
782 
783 /*
784  * Force a shutdown of the filesystem instantly while keeping the filesystem
785  * consistent. We don't do an unmount here; just shutdown the shop, make sure
786  * that absolutely nothing persistent happens to this filesystem after this
787  * point.
788  */
789 void
790 xfs_do_force_shutdown(
791 	xfs_mount_t	*mp,
792 	int		flags,
793 	char		*fname,
794 	int		lnnum)
795 {
796 	int		logerror;
797 
798 	logerror = flags & SHUTDOWN_LOG_IO_ERROR;
799 
800 	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
801 		xfs_notice(mp,
802 	"%s(0x%x) called from line %d of file %s.  Return address = 0x%p",
803 			__func__, flags, lnnum, fname, __return_address);
804 	}
805 	/*
806 	 * No need to duplicate efforts.
807 	 */
808 	if (XFS_FORCED_SHUTDOWN(mp) && !logerror)
809 		return;
810 
811 	/*
812 	 * This flags XFS_MOUNT_FS_SHUTDOWN, makes sure that we don't
813 	 * queue up anybody new on the log reservations, and wakes up
814 	 * everybody who's sleeping on log reservations to tell them
815 	 * the bad news.
816 	 */
817 	if (xfs_log_force_umount(mp, logerror))
818 		return;
819 
820 	if (flags & SHUTDOWN_CORRUPT_INCORE) {
821 		xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
822     "Corruption of in-memory data detected.  Shutting down filesystem");
823 		if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
824 			xfs_stack_trace();
825 	} else if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
826 		if (logerror) {
827 			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
828 		"Log I/O Error Detected.  Shutting down filesystem");
829 		} else if (flags & SHUTDOWN_DEVICE_REQ) {
830 			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
831 		"All device paths lost.  Shutting down filesystem");
832 		} else if (!(flags & SHUTDOWN_REMOTE_REQ)) {
833 			xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_IOERROR,
834 		"I/O Error Detected. Shutting down filesystem");
835 		}
836 	}
837 	if (!(flags & SHUTDOWN_FORCE_UMOUNT)) {
838 		xfs_alert(mp,
839 	"Please umount the filesystem and rectify the problem(s)");
840 	}
841 }
842