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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_bit.h"
22 #include "xfs_inum.h"
23 #include "xfs_log.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_inode_item.h"
38 #include "xfs_btree.h"
39 #include "xfs_error.h"
40 #include "xfs_alloc.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_fsops.h"
43 #include "xfs_itable.h"
44 #include "xfs_trans_space.h"
45 #include "xfs_rtalloc.h"
46 #include "xfs_rw.h"
47 #include "xfs_filestream.h"
48 
49 /*
50  * File system operations
51  */
52 
53 int
xfs_fs_geometry(xfs_mount_t * mp,xfs_fsop_geom_t * geo,int new_version)54 xfs_fs_geometry(
55 	xfs_mount_t		*mp,
56 	xfs_fsop_geom_t		*geo,
57 	int			new_version)
58 {
59 	geo->blocksize = mp->m_sb.sb_blocksize;
60 	geo->rtextsize = mp->m_sb.sb_rextsize;
61 	geo->agblocks = mp->m_sb.sb_agblocks;
62 	geo->agcount = mp->m_sb.sb_agcount;
63 	geo->logblocks = mp->m_sb.sb_logblocks;
64 	geo->sectsize = mp->m_sb.sb_sectsize;
65 	geo->inodesize = mp->m_sb.sb_inodesize;
66 	geo->imaxpct = mp->m_sb.sb_imax_pct;
67 	geo->datablocks = mp->m_sb.sb_dblocks;
68 	geo->rtblocks = mp->m_sb.sb_rblocks;
69 	geo->rtextents = mp->m_sb.sb_rextents;
70 	geo->logstart = mp->m_sb.sb_logstart;
71 	ASSERT(sizeof(geo->uuid)==sizeof(mp->m_sb.sb_uuid));
72 	memcpy(geo->uuid, &mp->m_sb.sb_uuid, sizeof(mp->m_sb.sb_uuid));
73 	if (new_version >= 2) {
74 		geo->sunit = mp->m_sb.sb_unit;
75 		geo->swidth = mp->m_sb.sb_width;
76 	}
77 	if (new_version >= 3) {
78 		geo->version = XFS_FSOP_GEOM_VERSION;
79 		geo->flags =
80 			(xfs_sb_version_hasattr(&mp->m_sb) ?
81 				XFS_FSOP_GEOM_FLAGS_ATTR : 0) |
82 			(xfs_sb_version_hasnlink(&mp->m_sb) ?
83 				XFS_FSOP_GEOM_FLAGS_NLINK : 0) |
84 			(xfs_sb_version_hasquota(&mp->m_sb) ?
85 				XFS_FSOP_GEOM_FLAGS_QUOTA : 0) |
86 			(xfs_sb_version_hasalign(&mp->m_sb) ?
87 				XFS_FSOP_GEOM_FLAGS_IALIGN : 0) |
88 			(xfs_sb_version_hasdalign(&mp->m_sb) ?
89 				XFS_FSOP_GEOM_FLAGS_DALIGN : 0) |
90 			(xfs_sb_version_hasshared(&mp->m_sb) ?
91 				XFS_FSOP_GEOM_FLAGS_SHARED : 0) |
92 			(xfs_sb_version_hasextflgbit(&mp->m_sb) ?
93 				XFS_FSOP_GEOM_FLAGS_EXTFLG : 0) |
94 			(xfs_sb_version_hasdirv2(&mp->m_sb) ?
95 				XFS_FSOP_GEOM_FLAGS_DIRV2 : 0) |
96 			(xfs_sb_version_hassector(&mp->m_sb) ?
97 				XFS_FSOP_GEOM_FLAGS_SECTOR : 0) |
98 			(xfs_sb_version_hasasciici(&mp->m_sb) ?
99 				XFS_FSOP_GEOM_FLAGS_DIRV2CI : 0) |
100 			(xfs_sb_version_haslazysbcount(&mp->m_sb) ?
101 				XFS_FSOP_GEOM_FLAGS_LAZYSB : 0) |
102 			(xfs_sb_version_hasattr2(&mp->m_sb) ?
103 				XFS_FSOP_GEOM_FLAGS_ATTR2 : 0);
104 		geo->logsectsize = xfs_sb_version_hassector(&mp->m_sb) ?
105 				mp->m_sb.sb_logsectsize : BBSIZE;
106 		geo->rtsectsize = mp->m_sb.sb_blocksize;
107 		geo->dirblocksize = mp->m_dirblksize;
108 	}
109 	if (new_version >= 4) {
110 		geo->flags |=
111 			(xfs_sb_version_haslogv2(&mp->m_sb) ?
112 				XFS_FSOP_GEOM_FLAGS_LOGV2 : 0);
113 		geo->logsunit = mp->m_sb.sb_logsunit;
114 	}
115 	return 0;
116 }
117 
118 static int
xfs_growfs_data_private(xfs_mount_t * mp,xfs_growfs_data_t * in)119 xfs_growfs_data_private(
120 	xfs_mount_t		*mp,		/* mount point for filesystem */
121 	xfs_growfs_data_t	*in)		/* growfs data input struct */
122 {
123 	xfs_agf_t		*agf;
124 	xfs_agi_t		*agi;
125 	xfs_agnumber_t		agno;
126 	xfs_extlen_t		agsize;
127 	xfs_extlen_t		tmpsize;
128 	xfs_alloc_rec_t		*arec;
129 	struct xfs_btree_block	*block;
130 	xfs_buf_t		*bp;
131 	int			bucket;
132 	int			dpct;
133 	int			error;
134 	xfs_agnumber_t		nagcount;
135 	xfs_agnumber_t		nagimax = 0;
136 	xfs_rfsblock_t		nb, nb_mod;
137 	xfs_rfsblock_t		new;
138 	xfs_rfsblock_t		nfree;
139 	xfs_agnumber_t		oagcount;
140 	int			pct;
141 	xfs_trans_t		*tp;
142 
143 	nb = in->newblocks;
144 	pct = in->imaxpct;
145 	if (nb < mp->m_sb.sb_dblocks || pct < 0 || pct > 100)
146 		return XFS_ERROR(EINVAL);
147 	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
148 		return error;
149 	dpct = pct - mp->m_sb.sb_imax_pct;
150 	error = xfs_read_buf(mp, mp->m_ddev_targp,
151 			XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
152 			XFS_FSS_TO_BB(mp, 1), 0, &bp);
153 	if (error)
154 		return error;
155 	ASSERT(bp);
156 	xfs_buf_relse(bp);
157 
158 	new = nb;	/* use new as a temporary here */
159 	nb_mod = do_div(new, mp->m_sb.sb_agblocks);
160 	nagcount = new + (nb_mod != 0);
161 	if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
162 		nagcount--;
163 		nb = nagcount * mp->m_sb.sb_agblocks;
164 		if (nb < mp->m_sb.sb_dblocks)
165 			return XFS_ERROR(EINVAL);
166 	}
167 	new = nb - mp->m_sb.sb_dblocks;
168 	oagcount = mp->m_sb.sb_agcount;
169 	if (nagcount > oagcount) {
170 		xfs_filestream_flush(mp);
171 		down_write(&mp->m_peraglock);
172 		mp->m_perag = kmem_realloc(mp->m_perag,
173 			sizeof(xfs_perag_t) * nagcount,
174 			sizeof(xfs_perag_t) * oagcount,
175 			KM_SLEEP);
176 		memset(&mp->m_perag[oagcount], 0,
177 			(nagcount - oagcount) * sizeof(xfs_perag_t));
178 		mp->m_flags |= XFS_MOUNT_32BITINODES;
179 		nagimax = xfs_initialize_perag(mp, nagcount);
180 		up_write(&mp->m_peraglock);
181 	}
182 	tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
183 	tp->t_flags |= XFS_TRANS_RESERVE;
184 	if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
185 			XFS_GROWDATA_LOG_RES(mp), 0, 0, 0))) {
186 		xfs_trans_cancel(tp, 0);
187 		return error;
188 	}
189 
190 	nfree = 0;
191 	for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
192 		/*
193 		 * AG freelist header block
194 		 */
195 		bp = xfs_buf_get(mp->m_ddev_targp,
196 				  XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
197 				  XFS_FSS_TO_BB(mp, 1), 0);
198 		agf = XFS_BUF_TO_AGF(bp);
199 		memset(agf, 0, mp->m_sb.sb_sectsize);
200 		agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
201 		agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
202 		agf->agf_seqno = cpu_to_be32(agno);
203 		if (agno == nagcount - 1)
204 			agsize =
205 				nb -
206 				(agno * (xfs_rfsblock_t)mp->m_sb.sb_agblocks);
207 		else
208 			agsize = mp->m_sb.sb_agblocks;
209 		agf->agf_length = cpu_to_be32(agsize);
210 		agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
211 		agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
212 		agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
213 		agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
214 		agf->agf_flfirst = 0;
215 		agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
216 		agf->agf_flcount = 0;
217 		tmpsize = agsize - XFS_PREALLOC_BLOCKS(mp);
218 		agf->agf_freeblks = cpu_to_be32(tmpsize);
219 		agf->agf_longest = cpu_to_be32(tmpsize);
220 		error = xfs_bwrite(mp, bp);
221 		if (error) {
222 			goto error0;
223 		}
224 		/*
225 		 * AG inode header block
226 		 */
227 		bp = xfs_buf_get(mp->m_ddev_targp,
228 				  XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
229 				  XFS_FSS_TO_BB(mp, 1), 0);
230 		agi = XFS_BUF_TO_AGI(bp);
231 		memset(agi, 0, mp->m_sb.sb_sectsize);
232 		agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
233 		agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
234 		agi->agi_seqno = cpu_to_be32(agno);
235 		agi->agi_length = cpu_to_be32(agsize);
236 		agi->agi_count = 0;
237 		agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
238 		agi->agi_level = cpu_to_be32(1);
239 		agi->agi_freecount = 0;
240 		agi->agi_newino = cpu_to_be32(NULLAGINO);
241 		agi->agi_dirino = cpu_to_be32(NULLAGINO);
242 		for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
243 			agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
244 		error = xfs_bwrite(mp, bp);
245 		if (error) {
246 			goto error0;
247 		}
248 		/*
249 		 * BNO btree root block
250 		 */
251 		bp = xfs_buf_get(mp->m_ddev_targp,
252 			XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
253 			BTOBB(mp->m_sb.sb_blocksize), 0);
254 		block = XFS_BUF_TO_BLOCK(bp);
255 		memset(block, 0, mp->m_sb.sb_blocksize);
256 		block->bb_magic = cpu_to_be32(XFS_ABTB_MAGIC);
257 		block->bb_level = 0;
258 		block->bb_numrecs = cpu_to_be16(1);
259 		block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
260 		block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
261 		arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
262 		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
263 		arec->ar_blockcount = cpu_to_be32(
264 			agsize - be32_to_cpu(arec->ar_startblock));
265 		error = xfs_bwrite(mp, bp);
266 		if (error) {
267 			goto error0;
268 		}
269 		/*
270 		 * CNT btree root block
271 		 */
272 		bp = xfs_buf_get(mp->m_ddev_targp,
273 			XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
274 			BTOBB(mp->m_sb.sb_blocksize), 0);
275 		block = XFS_BUF_TO_BLOCK(bp);
276 		memset(block, 0, mp->m_sb.sb_blocksize);
277 		block->bb_magic = cpu_to_be32(XFS_ABTC_MAGIC);
278 		block->bb_level = 0;
279 		block->bb_numrecs = cpu_to_be16(1);
280 		block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
281 		block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
282 		arec = XFS_ALLOC_REC_ADDR(mp, block, 1);
283 		arec->ar_startblock = cpu_to_be32(XFS_PREALLOC_BLOCKS(mp));
284 		arec->ar_blockcount = cpu_to_be32(
285 			agsize - be32_to_cpu(arec->ar_startblock));
286 		nfree += be32_to_cpu(arec->ar_blockcount);
287 		error = xfs_bwrite(mp, bp);
288 		if (error) {
289 			goto error0;
290 		}
291 		/*
292 		 * INO btree root block
293 		 */
294 		bp = xfs_buf_get(mp->m_ddev_targp,
295 			XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
296 			BTOBB(mp->m_sb.sb_blocksize), 0);
297 		block = XFS_BUF_TO_BLOCK(bp);
298 		memset(block, 0, mp->m_sb.sb_blocksize);
299 		block->bb_magic = cpu_to_be32(XFS_IBT_MAGIC);
300 		block->bb_level = 0;
301 		block->bb_numrecs = 0;
302 		block->bb_u.s.bb_leftsib = cpu_to_be32(NULLAGBLOCK);
303 		block->bb_u.s.bb_rightsib = cpu_to_be32(NULLAGBLOCK);
304 		error = xfs_bwrite(mp, bp);
305 		if (error) {
306 			goto error0;
307 		}
308 	}
309 	xfs_trans_agblocks_delta(tp, nfree);
310 	/*
311 	 * There are new blocks in the old last a.g.
312 	 */
313 	if (new) {
314 		/*
315 		 * Change the agi length.
316 		 */
317 		error = xfs_ialloc_read_agi(mp, tp, agno, &bp);
318 		if (error) {
319 			goto error0;
320 		}
321 		ASSERT(bp);
322 		agi = XFS_BUF_TO_AGI(bp);
323 		be32_add_cpu(&agi->agi_length, new);
324 		ASSERT(nagcount == oagcount ||
325 		       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
326 		xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
327 		/*
328 		 * Change agf length.
329 		 */
330 		error = xfs_alloc_read_agf(mp, tp, agno, 0, &bp);
331 		if (error) {
332 			goto error0;
333 		}
334 		ASSERT(bp);
335 		agf = XFS_BUF_TO_AGF(bp);
336 		be32_add_cpu(&agf->agf_length, new);
337 		ASSERT(be32_to_cpu(agf->agf_length) ==
338 		       be32_to_cpu(agi->agi_length));
339 		xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
340 		/*
341 		 * Free the new space.
342 		 */
343 		error = xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, agno,
344 			be32_to_cpu(agf->agf_length) - new), new);
345 		if (error) {
346 			goto error0;
347 		}
348 	}
349 	if (nagcount > oagcount)
350 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
351 	if (nb > mp->m_sb.sb_dblocks)
352 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS,
353 				 nb - mp->m_sb.sb_dblocks);
354 	if (nfree)
355 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, nfree);
356 	if (dpct)
357 		xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
358 	error = xfs_trans_commit(tp, 0);
359 	if (error) {
360 		return error;
361 	}
362 	/* New allocation groups fully initialized, so update mount struct */
363 	if (nagimax)
364 		mp->m_maxagi = nagimax;
365 	if (mp->m_sb.sb_imax_pct) {
366 		__uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
367 		do_div(icount, 100);
368 		mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
369 	} else
370 		mp->m_maxicount = 0;
371 	for (agno = 1; agno < nagcount; agno++) {
372 		error = xfs_read_buf(mp, mp->m_ddev_targp,
373 				  XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
374 				  XFS_FSS_TO_BB(mp, 1), 0, &bp);
375 		if (error) {
376 			xfs_fs_cmn_err(CE_WARN, mp,
377 			"error %d reading secondary superblock for ag %d",
378 				error, agno);
379 			break;
380 		}
381 		xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, XFS_SB_ALL_BITS);
382 		/*
383 		 * If we get an error writing out the alternate superblocks,
384 		 * just issue a warning and continue.  The real work is
385 		 * already done and committed.
386 		 */
387 		if (!(error = xfs_bwrite(mp, bp))) {
388 			continue;
389 		} else {
390 			xfs_fs_cmn_err(CE_WARN, mp,
391 		"write error %d updating secondary superblock for ag %d",
392 				error, agno);
393 			break; /* no point in continuing */
394 		}
395 	}
396 	return 0;
397 
398  error0:
399 	xfs_trans_cancel(tp, XFS_TRANS_ABORT);
400 	return error;
401 }
402 
403 static int
xfs_growfs_log_private(xfs_mount_t * mp,xfs_growfs_log_t * in)404 xfs_growfs_log_private(
405 	xfs_mount_t		*mp,	/* mount point for filesystem */
406 	xfs_growfs_log_t	*in)	/* growfs log input struct */
407 {
408 	xfs_extlen_t		nb;
409 
410 	nb = in->newblocks;
411 	if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
412 		return XFS_ERROR(EINVAL);
413 	if (nb == mp->m_sb.sb_logblocks &&
414 	    in->isint == (mp->m_sb.sb_logstart != 0))
415 		return XFS_ERROR(EINVAL);
416 	/*
417 	 * Moving the log is hard, need new interfaces to sync
418 	 * the log first, hold off all activity while moving it.
419 	 * Can have shorter or longer log in the same space,
420 	 * or transform internal to external log or vice versa.
421 	 */
422 	return XFS_ERROR(ENOSYS);
423 }
424 
425 /*
426  * protected versions of growfs function acquire and release locks on the mount
427  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
428  * XFS_IOC_FSGROWFSRT
429  */
430 
431 
432 int
xfs_growfs_data(xfs_mount_t * mp,xfs_growfs_data_t * in)433 xfs_growfs_data(
434 	xfs_mount_t		*mp,
435 	xfs_growfs_data_t	*in)
436 {
437 	int error;
438 
439 	if (!capable(CAP_SYS_ADMIN))
440 		return XFS_ERROR(EPERM);
441 	if (!mutex_trylock(&mp->m_growlock))
442 		return XFS_ERROR(EWOULDBLOCK);
443 	error = xfs_growfs_data_private(mp, in);
444 	mutex_unlock(&mp->m_growlock);
445 	return error;
446 }
447 
448 int
xfs_growfs_log(xfs_mount_t * mp,xfs_growfs_log_t * in)449 xfs_growfs_log(
450 	xfs_mount_t		*mp,
451 	xfs_growfs_log_t	*in)
452 {
453 	int error;
454 
455 	if (!capable(CAP_SYS_ADMIN))
456 		return XFS_ERROR(EPERM);
457 	if (!mutex_trylock(&mp->m_growlock))
458 		return XFS_ERROR(EWOULDBLOCK);
459 	error = xfs_growfs_log_private(mp, in);
460 	mutex_unlock(&mp->m_growlock);
461 	return error;
462 }
463 
464 /*
465  * exported through ioctl XFS_IOC_FSCOUNTS
466  */
467 
468 int
xfs_fs_counts(xfs_mount_t * mp,xfs_fsop_counts_t * cnt)469 xfs_fs_counts(
470 	xfs_mount_t		*mp,
471 	xfs_fsop_counts_t	*cnt)
472 {
473 	xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
474 	spin_lock(&mp->m_sb_lock);
475 	cnt->freedata = mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
476 	cnt->freertx = mp->m_sb.sb_frextents;
477 	cnt->freeino = mp->m_sb.sb_ifree;
478 	cnt->allocino = mp->m_sb.sb_icount;
479 	spin_unlock(&mp->m_sb_lock);
480 	return 0;
481 }
482 
483 /*
484  * exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
485  *
486  * xfs_reserve_blocks is called to set m_resblks
487  * in the in-core mount table. The number of unused reserved blocks
488  * is kept in m_resblks_avail.
489  *
490  * Reserve the requested number of blocks if available. Otherwise return
491  * as many as possible to satisfy the request. The actual number
492  * reserved are returned in outval
493  *
494  * A null inval pointer indicates that only the current reserved blocks
495  * available  should  be returned no settings are changed.
496  */
497 
498 int
xfs_reserve_blocks(xfs_mount_t * mp,__uint64_t * inval,xfs_fsop_resblks_t * outval)499 xfs_reserve_blocks(
500 	xfs_mount_t             *mp,
501 	__uint64_t              *inval,
502 	xfs_fsop_resblks_t      *outval)
503 {
504 	__int64_t		lcounter, delta, fdblks_delta;
505 	__uint64_t		request;
506 
507 	/* If inval is null, report current values and return */
508 	if (inval == (__uint64_t *)NULL) {
509 		if (!outval)
510 			return EINVAL;
511 		outval->resblks = mp->m_resblks;
512 		outval->resblks_avail = mp->m_resblks_avail;
513 		return 0;
514 	}
515 
516 	request = *inval;
517 
518 	/*
519 	 * With per-cpu counters, this becomes an interesting
520 	 * problem. we needto work out if we are freeing or allocation
521 	 * blocks first, then we can do the modification as necessary.
522 	 *
523 	 * We do this under the m_sb_lock so that if we are near
524 	 * ENOSPC, we will hold out any changes while we work out
525 	 * what to do. This means that the amount of free space can
526 	 * change while we do this, so we need to retry if we end up
527 	 * trying to reserve more space than is available.
528 	 *
529 	 * We also use the xfs_mod_incore_sb() interface so that we
530 	 * don't have to care about whether per cpu counter are
531 	 * enabled, disabled or even compiled in....
532 	 */
533 retry:
534 	spin_lock(&mp->m_sb_lock);
535 	xfs_icsb_sync_counters_locked(mp, 0);
536 
537 	/*
538 	 * If our previous reservation was larger than the current value,
539 	 * then move any unused blocks back to the free pool.
540 	 */
541 	fdblks_delta = 0;
542 	if (mp->m_resblks > request) {
543 		lcounter = mp->m_resblks_avail - request;
544 		if (lcounter  > 0) {		/* release unused blocks */
545 			fdblks_delta = lcounter;
546 			mp->m_resblks_avail -= lcounter;
547 		}
548 		mp->m_resblks = request;
549 	} else {
550 		__int64_t	free;
551 
552 		free =  mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp);
553 		if (!free)
554 			goto out; /* ENOSPC and fdblks_delta = 0 */
555 
556 		delta = request - mp->m_resblks;
557 		lcounter = free - delta;
558 		if (lcounter < 0) {
559 			/* We can't satisfy the request, just get what we can */
560 			mp->m_resblks += free;
561 			mp->m_resblks_avail += free;
562 			fdblks_delta = -free;
563 		} else {
564 			fdblks_delta = -delta;
565 			mp->m_resblks = request;
566 			mp->m_resblks_avail += delta;
567 		}
568 	}
569 out:
570 	if (outval) {
571 		outval->resblks = mp->m_resblks;
572 		outval->resblks_avail = mp->m_resblks_avail;
573 	}
574 	spin_unlock(&mp->m_sb_lock);
575 
576 	if (fdblks_delta) {
577 		/*
578 		 * If we are putting blocks back here, m_resblks_avail is
579 		 * already at it's max so this will put it in the free pool.
580 		 *
581 		 * If we need space, we'll either succeed in getting it
582 		 * from the free block count or we'll get an enospc. If
583 		 * we get a ENOSPC, it means things changed while we were
584 		 * calculating fdblks_delta and so we should try again to
585 		 * see if there is anything left to reserve.
586 		 *
587 		 * Don't set the reserved flag here - we don't want to reserve
588 		 * the extra reserve blocks from the reserve.....
589 		 */
590 		int error;
591 		error = xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, fdblks_delta, 0);
592 		if (error == ENOSPC)
593 			goto retry;
594 	}
595 	return 0;
596 }
597 
598 int
xfs_fs_log_dummy(xfs_mount_t * mp)599 xfs_fs_log_dummy(
600 	xfs_mount_t	*mp)
601 {
602 	xfs_trans_t	*tp;
603 	xfs_inode_t	*ip;
604 	int		error;
605 
606 	tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
607 	error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
608 	if (error) {
609 		xfs_trans_cancel(tp, 0);
610 		return error;
611 	}
612 
613 	ip = mp->m_rootip;
614 	xfs_ilock(ip, XFS_ILOCK_EXCL);
615 
616 	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
617 	xfs_trans_ihold(tp, ip);
618 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
619 	xfs_trans_set_sync(tp);
620 	error = xfs_trans_commit(tp, 0);
621 
622 	xfs_iunlock(ip, XFS_ILOCK_EXCL);
623 	return error;
624 }
625 
626 int
xfs_fs_goingdown(xfs_mount_t * mp,__uint32_t inflags)627 xfs_fs_goingdown(
628 	xfs_mount_t	*mp,
629 	__uint32_t	inflags)
630 {
631 	switch (inflags) {
632 	case XFS_FSOP_GOING_FLAGS_DEFAULT: {
633 		struct super_block *sb = freeze_bdev(mp->m_super->s_bdev);
634 
635 		if (sb && !IS_ERR(sb)) {
636 			xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
637 			thaw_bdev(sb->s_bdev, sb);
638 		}
639 
640 		break;
641 	}
642 	case XFS_FSOP_GOING_FLAGS_LOGFLUSH:
643 		xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
644 		break;
645 	case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH:
646 		xfs_force_shutdown(mp,
647 				SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR);
648 		break;
649 	default:
650 		return XFS_ERROR(EINVAL);
651 	}
652 
653 	return 0;
654 }
655